Updated on 2024/02/01

写真a

 
FUNABIKI Nobuo
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
External link

Degree

  • Doctor of Engineering ( The University of Tokyo )

Research Interests

  • Webシステム

  • Educational Technology

  • Wireless Networks

  • 情報通信工学

  • 最適化アルゴリズム

  • Web Systems

  • 教育工学

  • Wireless Networking

  • Information and Communication Technology

  • Optimization Algorithms

Research Areas

  • Humanities & Social Sciences / Educational technology

  • Informatics / Information network

  • Informatics / Theory of informatics

  • Informatics / Computer system

  • Informatics / Human interface and interaction  / exercise assist

Education

  • ケ-スウェスタンリザ-ブ大学大学院   工学系研究科   電気工学

    - 1991

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    Country: United States

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  • Case Western Reserve University   Graduate School of Engineering   Electrical Engineering

    - 1991

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  • The University of Tokyo   工学部   計数工学科

    - 1984

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    Country: Japan

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  • The University of Tokyo    

    - 1984

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Research History

  • Graduate School of Natural Science and Technology,Okayama University

    2004

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  • Okayama University   Faculty of Engineering

    2001

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    Country:Japan

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  • Associate Professor,Associate Professor, Faculty of Engineering Science, Osaka University

    1995 - 2001

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  • Osaka University   School of Engineering Science Direct Affiliates

    1994 - 1995

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  • Senior Assistant Professor,Assistant Professor, Faculty of Engineering Science, Osaka University

    1994 - 1995

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  • 住友金属工業株式会社 職員(技術系)

    1984 - 1994

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  • Technical Staff,Sumitomo Metal Industries, Ltd.

    1984 - 1994

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Professional Memberships

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Committee Memberships

  • IEEE Consumer Technology Society   Vice President for Conferences  

    2023.1 - 2024.12   

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    Committee type:Academic society

  • IEEE Consumer Technology Society   Vice President  

    2023.1   

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    Committee type:Academic society

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  • IEEE   IEEE Hiroshima Section Chairman  

    2014   

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    Committee type:Academic society

    IEEE

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  • IEEE   広島支部支部長  

    2014   

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    Committee type:Academic society

    IEEE

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Papers

  • A Proposal of Hint Function for Java Programming Learning Assistant System

    Yanhui Jing, Nobuo Funabiki, Soe Thandar Aung, Xiqin Lu, Htoo Htoo Sandi Kyaw, Kiyoshi Ueda

    International Journal of Information and Education Technology   13 ( 11 )   1828 - 1834   2023.11

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    Publishing type:Research paper (scientific journal)  

    Nowadays, Java is one of the world’s most used object-oriented programming languages for its dependability and portability. To assist the self-studies of novice students, we have developed the Java programming learning assistance system (JPLAS). JPLAS offers several types of exercise problems for different difficulties, including the grammar-concept understanding problem (GUP), the mistake correction problem (MCP), the element fill-in-blank problem (EFP), and the phrase fill-in-blank problem (PFP), where a question asks to answer the corresponding keyword or phrase in the given source code. Unfortunately, some students cannot solve them well as the difficulty level is ascending. In this paper, to help such students, we propose a hint function that will show the first or more characters of each correct answer word in the answer interface on a web browser for JPLAS, when requested. The use of this function by a student can be traced by a teacher to analyze the performance and problem difficulty. For evaluations, we generated three instances for GUP, MCP, EFP, and PFP respectively, and assigned them to junior students taking the Java programming course in Okayama University, Japan. Their answer results found that the proposal is effective in helping students solve exercise problems in JPLAS, but the thinking time needs to be adjusted for PFP.

    DOI: 10.18178/ijiet.2023.13.11.1995

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  • Extensions of Exercise and Performance Learning Assistant System for Usability Improvements.

    Irin Tri Anggraini, Nobuo Funabiki, Wan-Chia Huang, Cheng-Liang Shih, Chih-Peng Fan

    Journal of Software   18 ( 4 )   2023.11

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.17706/jsw.18.4.218-227

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  • A Study of Grammar-concept Understanding Problem for Flutter Cross-platform Mobile Programming Learning

    Abdul Rahman Patta, Nobuo Funabiki, Xiqin Lu, Yan Watequlis Syaifudin

    2023 Sixth International Conference on Vocational Education and Electrical Engineering (ICVEE)   2023.10

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    Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/icvee59738.2023.10348237

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  • Code Writing Problems for Basic Object-Oriented Programming Study in Java Programming Learning Assistant System

    Khaing Hsu Wai, Nobuo Funabiki, Soe Thandar Aung, Xiqin Lu, Yanhui Jing, Htoo Htoo Sandi Kyaw, Wen-Chung Kao

    2023 IEEE 12th Global Conference on Consumer Electronics (GCCE)   5 - 6   2023.10

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    Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/gcce59613.2023.10315469

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  • A Proposal of Constant Modification Problem for Beginners to Start Scratch Programming

    Xiqin Lu, Nobuo Funabiki, Soe Thandar Aung, Wen-Chung Kao

    2023 IEEE 13th International Conference on Consumer Electronics - Berlin (ICCE-Berlin)   2023.9

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    Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/icce-berlin58801.2023.10375631

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  • A Study of Phrase Fill-in-Blank Problem for Learning Basic C Programming

    Xiqin Lu, Nobuo Funabiki, Annisa Anggun Puspitasari, Kiyoshi Ueda

    International Journal of Information and Education Technology   13 ( 9 )   1445 - 1451   2023.9

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    Publishing type:Research paper (scientific journal)  

    In a lot of universities across the world, C programming is taught to novice students in the first programming course. To assist their self-studies, we have developed C programming learning assistant system (CPLAS) that offers various programming problems with different learning goals where any answer from a student is automatically marked at the system. In this paper, we studied the phrase fill-in-blank problem (PFP) in CPLAS for learning basic C programming. A PFP instance gives a source code where several key phrases (set of elements) are blanked and requests to fill in them by a student. The correctness of answers is checked through string matching with the original ones. For evaluations, we generated 22 PFP instances for learning basic grammar topics and logic functions and assigned them with previous 15 instances for recursive functions to 21 students in Okayama University. The results confirmed the correctness of the generated instances and found the weakness of students in C programming study.

    DOI: 10.18178/ijiet.2023.13.9.1948

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  • An Interface Setup Optimization Method Using a Throughput Estimation Model for Concurrently Communicating Access Points in a Wireless Local Area Network.

    Fatema Akhter, Nobuo Funabiki, Ei Ei Htet, Bin Wu, Dezheng Kong 0001, Shihao Fang 0001

    Sensors   23 ( 14 )   6367 - 6367   2023.7

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/s23146367

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  • An Edge Device Framework in SEMAR IoT Application Server Platform

    Yohanes Yohanie Fridelin Panduman, Nobuo Funabiki, Sho Ito, Radhiatul Husna, Minoru Kuribayashi, Mitsuhiro Okayasu, Junya Shimazu, Sritrusta Sukaridhoto

    Information (Switzerland)   14 ( 6 )   312 - 312   2023.6

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    Publishing type:Research paper (scientific journal)  

    Nowadays, the Internet of Things (IoT) has become widely used at various places and for various applications. To facilitate this trend, we have developed the IoT application server platform called SEMAR (Smart Environmental Monitoring and Analytical in Real-Time), which offers standard features for collecting, displaying, and analyzing sensor data. An edge device is usually installed to connect sensors with the server, where the interface configuration, the data processing, the communication protocol, and the transmission interval need to be defined by the user. In this paper, we proposed an edge device framework for SEMAR to remotely optimize the edge device utilization with three phases. In the initialization phase, it automatically downloads the configuration file to the device through HTTP communications. In the service phase, it converts data from various sensors into the standard data format and sends it to the server periodically. In the update phase, it remotely updates the configuration through MQTT communications. For evaluations, we applied the proposal to the fingerprint-based indoor localization system (FILS15.4) and the data logging system. The results confirm the effectiveness in utilizing SEMAR to develop IoT application systems.

    DOI: 10.3390/info14060312

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  • A Study of the Active Access-Point Configuration Algorithm under Channel Bonding to Dual IEEE 802.11n and 11ac Interfaces in an Elastic WLAN System for IoT Applications

    Sujan Chandra Roy, Nobuo Funabiki, Md. Mahbubur Rahman, Bin Wu, Minoru Kuribayashi, Wen-Chung Kao

    Signals   2023.4

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/signals4020015

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  • Three Diverse Applications of General-Purpose Parameter Optimization Algorithm.

    Yuan-Zhi Huo, Pradini Puspitaningayu, Nobuo Funabiki, Kazushi Hamazaki, Minoru Kuribayashi, Yihan Zhao, Kazuyuki Kojima

    Algorithms   16 ( 1 )   45 - 45   2023.1

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/a16010045

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  • Applications of Three Introductory C Programming Exercise Problems in Nihon University.

    Xiqin Lu, Nobuo Funabiki, Kiyoshi Ueda, Wen-Chung Kao

    ICCE-Taiwan   231 - 232   2023

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/ICCE-Taiwan58799.2023.10226698

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    Other Link: https://dblp.uni-trier.de/db/conf/icce-tw/icce-tw2023.html#LuFUK23

  • An Implementation of Java Programming Learning Assistant System in University Course

    Xiqin Lu, Nobuo Funabiki, Soe Thandar Aung, Yanhui Jing, Shingo Yamaguchi

    2023 11th International Conference on Information and Education Technology, ICIET 2023   215 - 220   2023

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    Publishing type:Research paper (international conference proceedings)  

    Nowadays, Java programming is used in a variety of application systems as a highly portable object-oriented programming language. To assist its self-studies by novice students, we have developed the Java programming learning assistant system (JPLAS), and implemented the personal answer platform on Node.js. JPLAS offers several types of exercise problems at different learning levels, including the grammar-concept understanding problem (GUP), the value trace problem (VTP), the mistake correction problem (MCP), the element fill-in-blank problem (EFP), the code completion problem (CCP), and the phase fill-in-blank problem (PFP). Any answer is automatically marked by string matching with the correct one on the platform. In this paper, we present an implementation of the six problem types in a Java programming course in Okayama University. We generated 109 problem instances by following its curriculum and assigned them to 58 third-year students as homework before the final examination. Their solution results reveal the difficulty difference among the problem types and confirm the validity in the Java programming course.

    DOI: 10.1109/ICIET56899.2023.10111422

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  • A Study of Two Types of Introductory Exercise Problems for Network Programming Learning with Python.

    Xiqin Lu, Nobuo Funabiki, Kiyoshi Ueda, Wen-Chung Kao

    ICCCM   12 - 19   2023

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1145/3617733.3617736

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    Other Link: https://dblp.uni-trier.de/db/conf/icccm/icccm2023.html#LuFUK23

  • An Idea of Drone-Based Building Crack Detection System in SEMAR IoT Server Platform.

    Yohanes Yohanie Fridelin Panduman, Nobuo Funabiki, Sritrusta Sukaridhoto

    GCCE   12 - 13   2023

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/GCCE59613.2023.10315417

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    Other Link: https://dblp.uni-trier.de/db/conf/gcce/gcce2023.html#PandumanFS23

  • A Preliminary Evaluation of Portrait Drawing Learning Assistant System.

    Yue Zhang, Zitong Kong, Yuan-Zhi Huo, Nobuo Funabiki, Dwinanda Puspitasari Harahap

    GCCE   3 - 4   2023

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/GCCE59613.2023.10315422

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    Other Link: https://dblp.uni-trier.de/db/conf/gcce/gcce2023.html#ZhangKHFH23

  • A Proposal of Auxiliary Line Generation Algorithm for Portrait Drawing Learning Assistant System Using OpenPose and OpenCV.

    Zitong Kong, Yue Zhang, Nobuo Funabiki, Yuan-Zhi Huo, Minoru Kuribayashi, Dwinanda Puspitasari Harahap

    GCCE   1 - 2   2023

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/GCCE59613.2023.10315351

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    Other Link: https://dblp.uni-trier.de/db/conf/gcce/gcce2023.html#KongZFHKH23

  • INSUS: Indoor Navigation System Using Unity and Smartphone for User Ambulation Assistance.

    Evianita Dewi Fajrianti, Nobuo Funabiki, Sritrusta Sukaridhoto, Yohanes Yohanie Fridelin Panduman, Kong Dezheng 0001, Fang Shihao 0001, Anak Agung Surya Pradhana

    Information(Inf.)   14 ( 7 )   359 - 359   2023

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/info14070359

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  • A Web-Based Docker Image Assistant Generation Tool for User-PC Computing System.

    Lynn Htet Aung, Nobuo Funabiki, Soe Thandar Aung, Xudong Zhou, Xu Xiang, Wen-Chung Kao

    Information(Inf.)   14 ( 6 )   300 - 300   2023

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/info14060300

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  • An Implementation of Phrase Fill-in-blank Problem for Test Code Reading Study in Java Programming Learning Assistant System.

    Xiqin Lu, Nobuo Funabiki, Khaing Hsu Wai, Soe Thandar Aung, Mustika Mentari, Wen-Chun Kao

    IAIT   38 - 5   2023

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1145/3628454.3631856

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    Other Link: https://dblp.uni-trier.de/db/conf/iait/iait2023.html#LuFWAMK23

  • A Design of Automatic Reference Paper Collection System Using Selenium and Bert Model.

    Inzali Naing, Nobuo Funabiki, Khaing Hsu Wai, Soe Thandar Aung

    GCCE   267 - 268   2023

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/GCCE59613.2023.10315512

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    Other Link: https://dblp.uni-trier.de/db/conf/gcce/gcce2023.html#NaingFWA23

  • A Study of Hand Gesture Exergame for Dementia Development Suppression.

    Irin Tri Anggraini, Yanqi Xiao, Nobuo Funabiki, Wan-Chia Huang, Cheng-Liang Shih, Chih-Peng Fan

    GCCE   139 - 140   2023

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/GCCE59613.2023.10315607

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    Other Link: https://dblp.uni-trier.de/db/conf/gcce/gcce2023.html#AnggrainiXFHSF23

  • A proposal of printed table digitization algorithm with image processing Invited Reviewed International coauthorship

    Chenrui Shi, Nobuo Funabiki, Yuanzhi Huo, Mustika Mentari, Kohei Suga, and Takashi Toshida

    Algorithms   15 ( 471 )   2022.12

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  • A Throughput Request Satisfaction Method for Concurrently Communicating Multiple Hosts in Wireless Local Area Network

    Md. Mahbubur Rahman, Nobuo Funabiki, Kwenga Ismael Munene, Sujan Chandra Roy, Minoru Kuribayashi, Melki Mario Gulo, Wen-Chung Kao

    Sensors   22 ( 22 )   8823 - 8823   2022.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    Nowadays, the IEEE 802.11 wireless local area network (WLAN) has been widely used for Internet access services around the world. Then, the unfairness or insufficiency in meeting the throughput request can appear among concurrently communicating hosts with the same access point (AP), which should be solved by sacrificing advantageous hosts. Previously, we studied the fairness control method by adopting packet transmission delay at the AP. However, it suffers from slow convergence and may not satisfy different throughput requests among hosts. In this paper, we propose a throughput request satisfaction method for providing fair or different throughput requests when multiple hosts are concurrently communicating with a single AP. To meet the throughput request, the method (1) measures the single and concurrent throughput for each host, (2) calculates the channel occupying time from them, (3) derives the target throughput to achieve the given throughput request, and (4) controls the traffic by applying traffic shaping at the AP. For evaluations, we implemented the proposal in the WLAN testbed system with one Raspberry Pi AP and up to five hosts, and conducted extensive experiments in five scenarios with different throughput requests. The results confirmed the effectiveness of our proposal.

    DOI: 10.3390/s22228823

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  • A throughput drop estimation model and its application to joint optimization of transmission power, frequency channel, and channel bonding in IEEE 802.11n WLAN for large-scale IoT environments Reviewed International coauthorship

    Kwenga Ismael Munene, Nobuo Funabiki, Md. Mahbubur Rahman, Hendy Briantoro, Sujan Chandra Roy, and Minoru Kuribayashi

    Internet of Things   20   1 - 19   2022.11

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  • A Proposal of Mistake Correction Problem for Debugging Study in C Programming Learning Assistant System

    Yanhui Jing, Nobuo Funabiki, Soe Thandar Aung, Xiqin Lu, Annisa Anggun Puspitasari, Htoo Htoo Sandi Kyaw, Wen Chung Kao

    International Journal of Information and Education Technology   12 ( 11 )   1158 - 1163   2022.11

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    —Currently, C programming is taught as the first programming language in many universities around the world due to the easy-to-learn and middle-level nature. However, the confusing concepts of keywords and unfamiliar formality make it difficult for students to study. Therefore, we have previously developed C programming learning assistance system (CPLAS) for self-studies of novice students. CPLAS offers several types of exercise problems with the automatic answer marking by string matching. In this paper, we propose a mistake correction problem (MCP) for code debugging study as a new problem type in CPLAS. MCP requests to answer every mistaken element and its correction in a given corrupt source code. We list up reserved words and common library functions in C programming for candidates of mistaken elements, and implement the MCP instance generation algorithm. To help solving MCP instances by a student, we implement the answer interface that shows the line number of each mistake, the corrupt code and answer forms in parallel, and the hint of suggesting the first character of each answer. For evaluations of the proposal, we generate 20 instances with 91 mistakes for basic grammars, and assign them to 18 university students in Japan, China, and Indonesia. Their answer results confirm the effectiveness of MCP.

    DOI: 10.18178/ijiet.2022.12.11.1733

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  • An Implementation of Element Fill-in-Blank Problems for Code Understanding Study of JavaScript-Based Web-Client Programming

    Huiyu Qi, Nobuo Funabiki, Khaing Hsu Wai, Xiqin Lu, Htoo Htoo Sandi Kyaw, Wen Chung Kao

    International Journal of Information and Education Technology   12 ( 11 )   1179 - 1184   2022.11

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    At present, web-client programming using HTML, CSS, and JavaScript is essential in web application systems to offer dynamic behaviors in web pages. With rich libraries and short coding features, it becomes common in developing user interfaces. However, the teaching course is not common in universities due to limited time. Therefore, self-study tools are strongly desired to promote it in societies. Previously, we have studied the programming learning assistant system (PLAS) as a programming self-study platform. In PLAS, among several types of programming problems, the element fill-in-blank problem (EFP) has been implemented for code understanding study of C and Java programming. In an EFP instance, the blank elements in a source code should be filled in with the proper words, where the correctness is checked by string matching. In this paper, we implement EFP for web-client programming in PLAS. In a web page, HTML and CSS define the components with tags in the document object model (DOM), and JavaScript offers their dynamic changes with libraries, which are blanked in EFP. Besides, a set of web page screenshots are given to help the solution. For evaluations, the generated 21 EFP instances were assigned to 20 master students in Okayama University. By analyzing their solution results, the effectiveness was confirmed for JavaScript programming learning.

    DOI: 10.18178/ijiet.2022.12.11.1736

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  • An implementation of code writing problem platform for Python programming learning using Node.js Reviewed International coauthorship

    Shune Lae Aung, Nobuo Funabiki, San Hay Mar Shwe, Soe Thandar Aung, and Wen-Chung Kao

    Proceedings of 2022 IEEE 11th Global Conference on Consumer Electronics (GCCE)   882 - 883   2022.10

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

  • An investigation of code modification problem for learning server-side JavaScript programming in web application system Reviewed International coauthorship

    Khaing Hsu Wai, Nobuo Funabiki, Shune Lae Aung, Soe Thandar Aung, Yan Watequlis Syaifudin, and Wen-Chung Kao

    Proceedings of 2022 IEEE 11th Global Conference on Consumer Electronics (GCCE)   886 - 887   2022.10

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  • An application of code writing problem platform for Python programming learning Reviewed International coauthorship

    Shune Lae Aung, Nobuo Funabiki, San Hay Mar Shwe, Soe Thandar Aung, and Wen-Chung Kao

    Proceedings of 2022 IEEE 11th Global Conference on Consumer Electronics (GCCE)   884 - 885   2022.10

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  • A proposal of code modification problem for self-study of web client programming using JavaScript Reviewed International coauthorship

    Khaing Hsu Wai, Nobuo Funabiki1, Khin Thet Mon, May Zin Htun, San Hay Mar Shwe, Htoo Htoo Sandi Kyaw, and Wen-Chung Kao

    Advances in Science, Technology and Engineering Systems Journal (ASTESJ)   7 ( 5 )   53 - 61   2022.9

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  • Accuracy investigations of fingerprint-based indoor localization system Using IEEE 802.15.4 in two-floor environment Reviewed International coauthorship

    Pradini Puspitaningayu, Nobuo Funabiki, Yuanzhi Huo, Yohanes Panduman, Xinyu Wu, Minoru Kuribayashi, and Wen-Chung Kao

    Proceedings of 2022 The Fourth International Conference on Vocational Educational and Electrical Engineering (ICVEE 2022)   89 - 94   2022.9

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

  • An implementation of solving activity monitoring function in Android programming learning assistance system Reviewed International coauthorship

    Abdul Rahman Patta, Nobuo Funabiki, Yan Watequlis Syaifudin, and Wen Chung Kao

    Proceedings of 2022 The Fourth International Conference on Vocational Educational and Electrical Engineering (ICVEE 2022)   84 - 88   2022.9

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  • Implementation and evaluation of exercise and performance learning assistant system platform for Yoga pose practices using Node.js Reviewed International coauthorship

    Irin Tri Anggraini, Nobuo Funabiki, Pradini Puspitaningayu, Shih-Wei Shen, Wan-Chia Huang, and Chih-Peng Fan

    Proceedings of 2022 The Fourth International Conference on Vocational Educational and Electrical Engineering (ICVEE 2022)   100 - 105   2022.9

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

  • Design and implementation of indoor navigation for PENS visitors using augmented intelligence Reviewed International coauthorship

    Evianita Dewi Fajrianti, Nobuo Funabiki, Yohanes Yohanie Fridelin Panduman, Sritrusta Sukaridhoto, Muhammad Udin Harun Al Rasyid, and Rizqi Putri Nourma Budiarti

    Proceedings of 2022 The Fourth International Conference on Vocational Educational and Electrical Engineering (ICVEE 2022)   7 - 12   2022.9

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

  • Implementations of integration functions in IoT application server platform Reviewed International coauthorship

    Yohanes Yohanie Fridelin Panduman, Nobuo Funabiki, Pradini Puspitaningayu, Masaki Sakagami, and Sritrusta Sukaridhoto

    Proceedings of 2022 The Fourth International Conference on Vocational Educational and Electrical Engineering (ICVEE 2022)   72 - 77   2022.9

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

  • Design and implementation of SEMAR IoT server platform with applications Reviewed International coauthorship

    Yohanes Yohanie Fridelin Panduman, Nobuo Funabiki, Pradini Puspitaningayu, Minoru Kuribayashi, Sritrusta Sukaridhoto, and Wen-Chung Kao

    Sensors   22 ( 17 )   2022.8

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    Authorship:Corresponding author   Language:English  

  • A throughput fairness control method for concurrent communications in wireless local-area network with multiple access-points Reviewed International coauthorship

    Md. Mahbubur Rahman, Nobuo Funabiki, Kwenga Ismael Munene, Sujan Chandra Roy, Minoru Kuribayashi, and Wen-Chung Kao

    Journal of Communications   17 ( 8 )   592 - 599   2022.8

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    Authorship:Corresponding author   Language:English  

  • Design and Implementation of SEMAR IoT Server Platform with Applications

    Yohanes Yohanie Fridelin Panduman, Nobuo Funabiki, Pradini Puspitaningayu, Minoru Kuribayashi, Sritrusta Sukaridhoto, Wen-Chung Kao

    Sensors   2022.8

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/s22176436

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  • Investigation of value trace problem for C++ programming self-study of novice students Reviewed International coauthorship

    Shune Lae Aung, Nem Khan Dim, Soe Mya Mya Aye, Nobuo Funabiki, and Htoo Htoo Sandi Kyaw

    International Journal of Information and Education Technology (IJIET)   12 ( 7 )   631 - 636   2022.7

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    Authorship:Corresponding author   Language:English  

  • An implementation of job running backup function in user-PC computing system Reviewed International coauthorship

    Hein Htet, Nobuo Funabiki, Ariel Kamoyedji, Xudong Zhou, Xu Xiang, Shinji Sugawara and Wen-Chung Kao

    Proceedings of The 4th International Conference on Computer Communication and the Internet (ICCCI 2022)   156 - 161   2022.7

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

  • An implementation of exercise and performance learning assistant system platform using Node.js Reviewed International coauthorship

    Irin Tri Anggraini, Pradini Puspitaningayu, Nobuo Funabiki, Shih-Wei Shen, Wan-Chia Huang, and Chih-Peng Fan

    Proceedings of 2022 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW 2022)   193 - 194   2022.7

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

  • An investigation of learning outcomes using assignment without guide documents in Android programming learning assistance system Reviewed International coauthorship

    Abdul Rahman Patta, Nobuo Funabiki, Yan Watequlis Syaifuddin, and Wen-Chung Kao

    Proceedings of 2022 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW 2022)   195 - 196   2022.7

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  • A static uniform job assignment algorithm to workers in user-PC computing system Reviewed International coauthorship

    Xudong Zhou, Nobuo Funabiki, Shinji Sugawara, Hein Htet, and Ariel Kamoyedji

    Proceedings of The 10th International Conference on Computer and Communications Management (ICCCM 2022)   24 - 30   2022.7

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  • Design of OpenPose-based of exercise assistant system with instructor-user synchronization for self-practice dynamic Yoga Reviewed International coauthorship

    Shih-Wei Shen, Wan-Chia Huang, Irin Tri Anggraini, Nobuo Funabiki, and Chih-Peng Fan

    Proceedings of The 10th International Conference on Computer and Communications Management (ICCCM 2022)   246 - 251   2022.7

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  • An extension of job-worker assignment algorithm for dynamic job migration for user-PC computing system Reviewed International coauthorship

    Ariel Kamoyedji, Nobuo Funabiki, Hein Htet, Xudong Zhou, Minoru Kuribayashi and Shinji Sugawara

    Proceedings of The 10th International Conference on Computer and Communications Management (ICCCM 2022)   175 - 183   2022.7

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  • Code modification problems for multimedia use in JavaScript-based web client programming Reviewed International coauthorship

    Khaing Hsu Wai, Nobuo Funabiki, Huiyu Qi, Yanqi Xiao, Khin Thet Mon, and Yan Watequlis Syaifudin

    Proceedings of 14th International Workshop on Virtual Environment and Network-Oriented Applications (VENOA-2022)   16 - 21   2022.6

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  • A fingerprint-based indoor localization system using IEEE 802.15.4 for staying room detection Reviewed International coauthorship

    Pradini Puspitaningayu, Nobuo Funabiki, Yuanzhi Huo, Kazushi Hamazaki, Minoru Kuribayashi, and Wen-Chung Kao

    International Journal of Mobile Computing and Multimedia Communications (IJMCMC)   13 ( 1 )   1 - 21   2022.6

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  • A proposal of job-worker assignment algorithm considering CPU core utilization for user-PC computing system Reviewed International coauthorship

    Ariel Kamoyedji, Nobuo Funabiki, Hein Htet, and Minoru Kuribayashi

    International Journal of Future Computer and Communication (IJFCC)   11 ( 2 )   40 - 46   2022.5

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  • An extension of active access-point configuration algorithm to IEEE 802.11n and 11ac dual interfaces in wireless local-area network Reviewed International coauthorship

    Sujan Chandra Roy, Nobuo Funabiki, Kwenga Ismael Munene, Md. Mahbubur Rahman, and Minoru Kuribayashi

    International Journal of Future Computer and Communication (IJFCC)   11 ( 2 )   18 - 26   2022.5

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  • Value trace problems for code reading study of JavaScript programming Reviewed International coauthorship

    Khin Thet Mon, Khaing Hsu Wai, Nobuo Funabiki, and Htoo Htoo Sandi Kyaw

    International Journal of Information and Education Technology (IJIET)   12 ( 5 )   430 - 435   2022.5

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  • A study of three introductory exercise problems to novice students for C programming learning Reviewed International coauthorship

    Xiqin Lu, Nobuo Funabiki, Huiyu Qi, Kiyoshi Ueda, and Kazuyuki Kojima

    Proceedings of 2022 10th International Conference on Information and Education Technology (ICIET 2022)   289 - 294   2022.4

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  • A study of code modification problems for Excel operations in Python programming learning assistant system Reviewed International coauthorship

    San Hay Mar Shwe, Nobuo Funabiki, Khaing Hsu Wai, Shune Lae Aung, and Wen-Chung Kao

    Proceedings of 2022 10th International Conference on Information and Education Technology (ICIET 2022)   209 - 213   2022.4

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  • An implementation of Java programming learning assistant system platform using Node.js Reviewed International coauthorship

    Soe Thandar Aung, Nobuo Funabiki, Lynn Htet Aung, Hein Htet, Htoo Htoo Sandi Kyaw, and Shinji Sugawara

    Proceedings of 2022 10th International Conference on Information and Education Technology (ICIET 2022)   47 - 52   2022.4

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  • Exercise and performance learning assistant system for self-practice dynamic Yoga by OpenPose and Fuzzy based design Reviewed International coauthorship

    Shih-Wei Shen, Wan-Chia Huang, Irin Tri Anggraini, Nobuo Funabiki and Chih-Peng Fan

    Proceedings of 2022 10th International Conference on Information and Education Technology (ICIET 2022)   16 - 21   2022.4

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  • Application of Fingerprint-based Indoor Localization System Using IEEE 802.15.4 to Two-Floors Environment.

    Pradini Puspitaningayu, Nobuo Funabiki, Yuan-Zhi Huo, Kazushi Hamazaki, Minoru Kuribayashi, Wen-Chung Kao

    4th IEEE Global Conference on Life Sciences and Technologies(LifeTech)   239 - 240   2022

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    Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/LifeTech53646.2022.9754790

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  • Implementations of Online Job Acceptance Functions in User-PC Computing System.

    Hein Htet, Nobuo Funabiki, Ariel Kamoyedji, Xudong Zhou, Yan Watequlis Syaifudin, Irin Tri Anggraini, Minoru Kuribayashi

    4th IEEE Global Conference on Life Sciences and Technologies(LifeTech)   121 - 122   2022

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    DOI: 10.1109/LifeTech53646.2022.9754807

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  • A Proposal of Phrase Fill-in-blank Problem for Learning Recursive Function in C Programming.

    Xiqin Lu, Shixi Chen, Nobuo Funabiki, Minoru Kuribayashi, Kiyoshi Ueda

    4th IEEE Global Conference on Life Sciences and Technologies(LifeTech)   123 - 124   2022

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    Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/LifeTech53646.2022.9754593

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  • A Proposal of the Fingerprint Optimization Method for the Fingerprint-Based Indoor Localization System with IEEE 802.15.4 Devices.

    Yuan-Zhi Huo, Pradini Puspitaningayu, Nobuo Funabiki, Kazushi Hamazaki, Minoru Kuribayashi, Kazuyuki Kojima

    Information(Inf.)   13 ( 5 )   211 - 211   2022

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    DOI: 10.3390/info13050211

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  • A proposal of phrase fill-in-blank problem for learning recursive function in C programming

    Xiqin Lu, Shixi Chen, Nobuo Funabiki, Minoru Kuribayashi, Kiyoshi Ueda

    4th IEEE Global Conference on Life Sciences and Technologies (LifeTech)   123 - 124   2022

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    Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/LifeTech53646.2022.9754593

    Other Link: https://dblp.uni-trier.de/db/conf/lifetech/lifetech2022.html#LuCFKU22

  • A Throughput Fairness Control Method for Concurrent Communications in Wireless Local-Area Network with Multiple Access-Points.

    Md. Mahbubur Rahman, Nobuo Funabiki, Kwenga Ismael Munene, Sujan Chandra Roy, Minoru Kuribayashi, Wen-Chung Kao

    Journal of Communications   17 ( 8 )   592 - 599   2022

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    DOI: 10.12720/jcm.17.8.592-599

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  • Classification of Screenshot Image Captured in Online Meeting System.

    Minoru Kuribayashi, Kodai Kamakari, Nobuo Funabiki

    CD-MAKE   244 - 255   2022

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    DOI: 10.1007/978-3-031-14463-9_16

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    Other Link: https://dblp.uni-trier.de/db/conf/cdmake/cdmake2022.html#KuribayashiKF22

  • A Fingerprint-Based Indoor Localization System Using IEEE 802.15.4 for Staying Room Detection.

    Pradini Puspitaningayu, Nobuo Funabiki, Yuan-Zhi Huo, Kazushi Hamazaki, Minoru Kuribayashi, Wen-Chung Kao

    Int. J. Mob. Comput. Multim. Commun.   13 ( 1 )   1 - 21   2022

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    DOI: 10.4018/ijmcmc.301275

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  • A Study of Grammar-Concept Understanding Problem in C Programming Learning Assistant System

    Xiqin Lu, Nobuo Funabiki, Soe Thandar Aung, Htoo Htoo Sandi Kyaw, Kiyoshi Ueda, Wen Chung Kao

    ITE Transactions on Media Technology and Applications   10 ( 4 )   198 - 207   2022

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    C programming is taught in introductory programming courses in many universities across the world. To assist self-studies of novice students, we have developed C programming learning assistant system (CPLAS). In this paper, we study the grammar-concept understanding problem (GUP) in CPLAS for first-step studies of understanding grammar concepts in C programming. Each question describes the definition of a keyword in a source code and requests to answer it. Any answer is verified through string matching. If a student cannot answer questions, he/she does not understand basic concepts and may be lost in C programming study. For GUP, we selected 66 keywords with questions, and generated 35 instances that cover them. The assignment results to 130 undergraduate students in Okayama and Nihon Universities revealed the difficult keywords and learning progresses of students.

    DOI: 10.3169/mta.10.198

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  • Privacy Protection Against Automated Tracking System Using Adversarial Patch

    Hiroto Takiwaki, Minoru Kuribayashi, Nobuo Funabiki, Mehul S. Raval

    PROCEEDINGS OF 2022 ASIA-PACIFIC SIGNAL AND INFORMATION PROCESSING ASSOCIATION ANNUAL SUMMIT AND CONFERENCE (APSIPA ASC)   1849 - 1854   2022

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    Advances in machine learning technologies, such as convolutional neural networks, have helped identify individuals using face recognition and identification techniques. A system can be constructed to detect the presence of specific features in an object. However, if the technologies are abused, individuals can be tracked automatically and their privacy would be violated. Therefore, it is necessary to develop a technique for avoiding automated human tracking systems that use facial identification. Conventional methods study adversarial noise to avoid recognition and face identification. However, they do not investigate the geometrical changes in the patch area. Here, we compared the performance of a non-transparent patch with that of a transparent patch and proposed a method for improving robustness against changes in position. Our experiments demonstrated that the non-transparent patch does not significantly affect the success rate of a face-identification system. The proposed method improves robustness against changes in the patch position.

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  • A Study of Three Introductory Exercise Problems to Novice Students for C Programming Learning

    Xiqin Lu, Nobuo Funabiki, Huiyu Qi, Kiyoshi Ueda, Kazuyuki Kojima

    2022 10th International Conference on Information and Education Technology, ICIET 2022   289 - 294   2022

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    To assist self-studies of C programming at home by novice students, we have studied the grammar-concept under-standing problem (GUP), the value trace problem (VTP), and the phase fill-in-blank problem (PFP) as introductory programming exercise problems. A GUP instance asks the keyword in a given source code that corresponds to the grammar concept described in the question. A VTP instance asks the value of an important variable or message in the code. A PFP instance asks a set of elements or a message to be filled in for each blank in the code. In any instance, the correctness of an answer is marked through string matching with the correct one. In this paper, we present a study of three introductory problems to novice students. We generated GUP/VTP/PFP instances by following the C programming course curriculum in Nihon University, Japan, and assigned them to its first-year undergraduate students who solved them at home for the course review before the final examination. The solution results reveal difficulty differences among the three introductory problems and three student groups in terms of solution performances.

    DOI: 10.1109/ICIET55102.2022.9778953

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  • [Paper] A Study of Grammar-Concept Understanding Problem in C Programming Learning Assistant System

    Lu Xiqin, Funabiki Nobuo, Aung Soe Thandar, Kyaw Htoo Htoo Sandi, Ueda Kiyoshi, Kao Wen-Chung

    ITE Transactions on Media Technology and Applications   10 ( 4 )   198 - 207   2022

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    C programming is taught in introductory programming courses in many universities across the world. To assist self-studies of novice students, we have developed C programming learning assistant system (CPLAS). In this paper, we study the grammar-concept understanding problem (GUP) in CPLAS for first-step studies of understanding grammar concepts in C programming. Each question describes the definition of a keyword in a source code and requests to answer it. Any answer is verified through string matching. If a student cannot answer questions, he/she does not understand basic concepts and may be lost in C programming study. For GUP, we selected 66 keywords with questions, and generated 35 instances that cover them. The assignment results to 130 undergraduate students in Okayama and Nihon Universities revealed the difficult keywords and learning progresses of students.

    DOI: 10.3169/mta.10.198

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  • Detection and Correction of Adversarial Examples Based on JPEG-Compression-Derived Distortion

    Kenta Tsunomori, Yuma Yamasaki, Minoru Kuribayashi, Nobuo Funabiki, Isao Echizen

    PROCEEDINGS OF 2022 ASIA-PACIFIC SIGNAL AND INFORMATION PROCESSING ASSOCIATION ANNUAL SUMMIT AND CONFERENCE (APSIPA ASC)   1831 - 1836   2022

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    An effective way to defend against adversarial examples (AEs), which are used, for example, to attack applications such as face recognition, is to detect in advance whether an input image is an AE. Some AE defense methods focus on the response characteristics of image classifiers when denoising filters are applied to the input image. However, several filters are required, which results in a large amount of computation. Because JPEG compression of AEs effectively removes adversarial perturbations, the difference between the image before and after JPEG compression should be highly correlated with the perturbations. However, the difference should not be completely consistent with adversarial perturbations. We have developed a filtering operation that modulates this difference by varying their magnitude and positive/negative sign and adding them to an image so that adversarial perturbations can be effectively removed. We consider that adversarial perturbations that could not be removed by simply applying JPEG compression can be removed by modulating this difference. Furthermore, applying a resizing process to the image after adding these distortions enables us to remove perturbations that could not be removed otherwise. The filtering operation will successfully remove the adversarial noise and reconstruct the corrected samples from AEs. We also consider a simple but effective reconstruction method based on the filtering operations. Experiments in which the adversarial attack used was not known to the detector demonstrated that the proposed method could achieve better performance in terms of accuracy with reasonable computational complexity. In addition, the percentage of correct classification results after applying the proposed filter for non-targeted attacks was higher than that of JPEG compression and scaling. These results suggest that the proposed method effectively removes adversarial perturbations and is an effective filter for detecting AEs.

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  • Feasibility investigations of access-point transmission power optimization method under co-use of channel bonding and non channel bonding in wireless local-area network Reviewed

    Fatema Akhter, Sun Yuanshuai, Nobuo Funabiki, Hendy Briantoro, Kwenga Ismael Munene, Md. Mahbubur Rahman

    The Ninth International Symposium on Computing and Networking Workshops   69 - 72   2021.11

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  • A Proposal of Dynamic Job Scheduling Algorithm Considering CPU Core Utilization for User-PC Computing System. Reviewed

    Ariel Kamoyedji, Nobuo Funabiki, Hein Htet, Minoru Kuribayashi

    Ninth International Symposium on Computing and Networking   268 - 271   2021.11

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    Authorship:Corresponding author   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/CANDARW53999.2021.00051

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    Other Link: https://dblp.uni-trier.de/db/conf/ic-nc/candar2021w.html#KamoyedjiFHK21

  • A proposal of code modification problem for Web client programming using JavaScript Reviewed

    Khaing Hsu Wai, Nobuo Funabiki, Khin Thet Mon, San Hay Mar Shwe, Htoo Htoo, Sandi Kyaw, Khin Sandar Lin

    The Ninth International Symposium on Computing and Networking (CANDAR)   196 - 202   2021.11

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  • A study of grammar-concept understanding problems for web client programming with JavaScript Reviewed

    Khin Thet Mon, Nobuo Funabiki, Soe Thandar Aung, Khaing Hsu Wai, Khin Sandar Lin

    International Symposium on Socially and Technically Symbiotic Systems (STSS)   137 - 138   2021.11

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    DOI: 10.1109/GCCE59613.2023.10315660

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    Other Link: https://dblp.uni-trier.de/db/conf/gcce/gcce2023.html#MonQWFK23

  • Answer platform implementation using Node.js for code writing problem in Java programming learning assistant system Reviewed

    Soe Thandar Aung, Nobuo Funabiki, Yan Watequlis Syaifudin, Htoo Htoo, Sandi Kyaw, Wen-Chung Kao

    International Symposium on Socially and Technically Symbiotic Systems (STSS)   2021.11

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  • A proposal of code modification problem for Python programming learning assistant system Reviewed

    San Hay Mar Shwe, Nobuo Funabiki, Htoo Htoo, Sandi Kyaw, Khaing Hsu Wai, Wen-Chung Kao

    International Symposium on Socially and Technically Symbiotic Systems (STSS)   2021.11

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  • A proposal of grammar-concept understanding problem in Java programming learning assistant system Reviewed

    Soe Thandar Aung, Nobuo Funabiki, Yan Watequlis Syaifudin, Htoo Htoo, Sandi Kyaw, Shune Lae Aung, Nem Khan Dim, Wen-Chung Kao

    Journal of Advances in Information Technology (JAIT)   12 ( 4 )   342 - 345   2021.11

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  • An OpenPose-based exercise and performance learning assistant design for self-practice Yoga Reviewed

    Cheng-Hsien Lin, Shih-Wei Shen, Irin Tri Anggraini, Nobuo Funabiki, Chih-Peng Fan

    IEEE 10th Global Conference on Consumer Electronics (GCCE)   533 - 534   2021.10

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  • Test Code Improvements for Code Writing Problem in Java Programming Assistant System. Reviewed

    Xiqin Lu, Huiyu Qi, Nobuo Funabiki, Soe Thandar Aung, Ei Ei Htet, Khin Sandar Lin, Wen-Chung Kao

    10th IEEE Global Conference on Consumer Electronics(GCCE)   599 - 603   2021.10

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    DOI: 10.1109/GCCE53005.2021.9621949

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    Other Link: https://dblp.uni-trier.de/db/conf/gcce/gcce2021.html#LuQFAHLK21

  • Applicability investigation of transmission power optimization method for concurrently communicating access-points using channel bonding and non-Bonding in WLAN Reviewed

    Fatema Akhter, Nobuo Funabiki, Hendy Briantoro, Kwenga Ismael Munene, Md. Mahbubur Rahman, Minoru Kuribayashi

    International Conference on Vocational Education and Electrical Engineering (ICVEE)   2021.10

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  • An implementation of multimedia resources learning topic for interactive applications in Android programming learning assistance system Reviewed

    Yan Watequlis Syaifudin, Nobuo Funabiki, Mustika Mentari, d Muhammad, Sofiul Fuad

    International Conference on Vocational Education and Electrical Engineering (ICVEE)   2021.10

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  • Investigations of detection accuracy improvements for fingerprint-based indoor localization system using IEEE 802.15.4 Reviewed

    Pradini Puspitaningayu, Yuanzhi Huo, Nobuo Funabiki, Kazushi Hamazaki, Minoru Kuribayashi, Wen-Chung Kao

    International Conference on Vocational Education and Electrical Engineering (ICVEE)   2021.10

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  • Value trace problems with assisting references for Python programming self-study Reviewed

    San Hay Mar Hay Mar Shwe, Nobuo Funabiki, Yan Watequlis Syaifudin, Phyu Phyu Tar, Htoo Htoo Sandi Kyaw, Hnin Aye Thant, Wen-Chung Kao, Nandar Win Min, Thandar Myint, Ei Ei Htet

    International Journal of Web Information Systems   17 ( 4 )   287 - 299   2021.9

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    <sec>
    <title content-type="abstract-subheading">Purpose</title>
    This study aims to present the value trace problem (VTP) for Python programming self-study, by extending the works for Java programming learning assistant system. In total, 130 VTP instances are generated using Python codes in textbooks and websites that cover basic/advanced grammar topics, fundamental data structures and algorithms and two common library usages. Besides, assisting references on Python programming topics related to the VTP instances are introduced to assist novice learners in solving them efficiently.


    </sec>
    <sec>
    <title content-type="abstract-subheading">Design/methodology/approach</title>
    PyPLAS offers the VTP to study grammar topics and library usage through code reading. A VTP instance asks a learner to trace the actual values of important variables or output messages in the given source code. The correctness of any answer is checked through string matching.


    </sec>
    <sec>
    <title content-type="abstract-subheading">Findings</title>
    The applications to 48 undergraduate students in Myanmar and Indonesia confirm the validity of the proposal in Python programming self-studies by novice learners.


    </sec>
    <sec>
    <title content-type="abstract-subheading">Originality/value</title>
    The applications to 48 undergraduate students in Myanmar and Indonesia confirm the validity of the proposal in Python programming self-studies by novice learners.


    </sec>

    DOI: 10.1108/ijwis-03-2021-0025

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  • Applications of Grammar-Concept Understanding and Value Trace Problems to Novice Students for C Programming Learning.

    Nobuo Funabiki, Xiqin Lu, San Hay Mar Shwe, Ei Ei Htet, Htoo Htoo Sandi Kyaw, Kiyoshi Ueda, Wen-Chung Kao

    IEEE International Conference on Consumer Electronics-Taiwan(ICCE-TW)   1 - 2   2021.9

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    DOI: 10.1109/ICCE-TW52618.2021.9603085

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    Other Link: https://dblp.uni-trier.de/db/conf/icce-tw/icce-tw2021.html#FunabikiLSHKUK21

  • Evaluations of Fingerprint-based Indoor Positioning System Using IEEE 802.15.4. Reviewed

    Pradini Puspitaningayu, Nobuo Funabiki, Kazushi Hamazaki, Minoru Kuribayashi, Wen-Chung Kao

    IEEE International Conference on Consumer Electronics-Taiwan(ICCE-TW)   1 - 2   2021.9

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    DOI: 10.1109/ICCE-TW52618.2021.9603037

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  • A Web-based Online Platform of Distribution, Collection, and Validation for Assignments in Android Programming Learning Assistance System Reviewed

    Yan Watequlis Syaifudin, Nobuo Funabiki, Mustika Mentari, Habibie Ed Dien, Ikhlaashul Mu'aasyiqiin, Minoru Kuribayashi, Wen-Chung Kao

    ENGINEERING LETTERS   29 ( 3 )   1178 - 1193   2021.8

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    Currently, Android smartphones have dominated the distribution of mobile devices around the world. Then, with high demands for Android programming jobs, large numbers of schools, universities, and professional training institutions offer related courses. The Android Programming Learning Assistance System (APLAS) has been developed to accommodate independent and automatic assisting learning for students to learn Android programming by adopting test-driven development (TDD) method. APLAS offers learning materials to systematically study Android programming through solving topics with four stages and provides features for automatic validation of the student's answers by running given test codes. However, a platform to support various activities of teachers for handling a lot of students in the courses is not implemented yet, and it made their load become very high. This paper presents the proposal of online platform in APLAS for distributing the learning materials, collecting the student's answers, and validating them, based on a web application system. By using Gradle, a validator program was developed for running the test codes automatically in the server when a new answer is submitted. A comprehensive evaluation has been applied by asking 60 undergraduate students in an Indonesian university to use the online platform, solve three APLAS learning topics, and submit the answers. The results showed that the three functions worked properly, and the validation process of 183 submissions from all students delivered correct results on the server. The stability, robustness, effectiveness, performance, and security of the online platform were confirmed by analyzing the data of users' activities and validation results. The significant reduction in processing time on all three functions also confirmed its effectiveness and improvement. Finally, the students' feedback proved its usability.

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  • A Study of Throughput Drop Estimation Model for Concurrently Communicating Links Under Coexistence of Channel Bonding and Non-bonding in IEEE 802.11n WLAN Reviewed

    Kwenga Ismael Munene, Nobuo Funabiki, Hendy Briantoro, Md Mahbubur Rahman, Sujan Chandra Roy, Minoru Kuribayashi

    COMPLEX, INTELLIGENT AND SOFTWARE INTENSIVE SYSTEMS, CISIS-2021   278   700 - 714   2021.7

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    Currently, the IEEE 802.11n wireless local-area network (WLAN) has been broadly deployed world-wide for flexible and high-speed Internet access communications. Since it uses the limited number of partially overlapping channels (POCs) at 2.4 GHz band, the throughput performance is often degraded by interferences from signals of other WLANs. Thus, we have studied throughput drop estimation models for concurrently communicating multiple links under interferences, where the 40 MHz channel bonding (CB) and 20 MHz non-CB are considered separately. We have observed that the simultaneous use of CB and non-CB can improve the performance by enhancing the channel capacity while reducing the interference. In this paper, we study the throughput drop estimation model for concurrently communicating links under coexistence of CB and non-CB in IEEE 802.11n WLAN. The model accuracy is verified by comparing the estimated throughput with the measured one under various network topologies.

    DOI: 10.1007/978-3-030-79725-6_71

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  • An Implementation of Job Migration Function Using CRIU and Podman in Docker-based User-PC Computing System. Reviewed

    Hein Htet, Nobuo Funabiki, Ariel Kamoyedji, Xudong Zhou, Minoru Kuribayashi

    ICCCM 2021: 9th International Conference on Computer and Communications Management(ICCCM)   92 - 97   2021.7

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    Authorship:Corresponding author   Publishing type:Research paper (international conference proceedings)   Publisher:ACM  

    DOI: 10.1145/3479162.3479176

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  • A parameter optimization method for fingerprint-based indoor localization system using IEEE 802.15.4 devices Reviewed

    Yuanzhi Huo, Pradini Puspitaningayu, Nobuo Funabiki, Kazushi Hamazaki, Minoru Kuribayashi, Kazuyuki Kojima

    International Conference on Computer Communication and the Internet (ICCCI)   136 - 140   2021.6

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  • A study of element fill-in-blank problems for C programming learning assistant system Reviewed

    Htoo Htoo, Sandi Kyaw, Nobuo Funabiki, Shune Lae Aung, Nem Khan Dim, Wen-Chung Kao

    International Journal of Information and Education Technology (IJIET)   11 ( 6 )   255 - 261   2021.6

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  • A Throughput Drop Estimation Model for Concurrent Communications under Partially Overlapping Channels without Channel Bonding and Its Application to Channel Assignment in IEEE 802.11n WLAN. Reviewed

    Kwenga Ismael Munene, Nobuo Funabiki, Hendy Briantoro, Md. Mahbubur Rahman, Fatema Akhter, Minoru Kuribayashi, Wen-Chung Kao

    IEICE Transactions on Information & Systems   104-D ( 5 )   585 - 596   2021.5

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  • A Proposal of Advanced Widgets Learning Topic for Interactive Application in Android Programming Learning Assistance System. Reviewed

    Yan Watequlis Syaifudin, Nobuo Funabiki, Minoru Kuribayashi, Wen-Chung Kao

    SN Computer Science   2 ( 3 )   172 - 172   2021.5

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    DOI: 10.1007/s42979-021-00580-1

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  • A proposal of recommendation function for element fill-in-Blank problems in java programming learning assistant system Reviewed

    Su Sandy Wint, Nobuo Funabiki

    International Journal of Web Information Systems   17 ( 2 )   140 - 152   2021.4

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    <sec>
    <title content-type="abstract-subheading">Purpose</title>
    To advance Java programming educations, the authors have developed a Web-based Java programming learning assistant system (JPLAS). It offers the element fill-in-blank problem (EFP) for novice students to study Java grammar and basic programming skills by filling in the missing elements in a source code. An EFP instance can be generated by selecting an appropriate code, and applying the blank element selection algorithm. As it is expected to cover broad grammar topics, a number of EFP instances have been generated. This paper aims to propose a recommendation function to guide a student solving the proper EFP instances among them.


    </sec>
    <sec>
    <title content-type="abstract-subheading">Design/methodology/approach</title>
    This function considers the difficulty level of the EFP instance and the grammar topics that have been correctly answered by the student, and is implemented at the offline answering function of JPLAS using JavaScript so that students can use it even without the Internet connections.


    </sec>
    <sec>
    <title content-type="abstract-subheading">Findings</title>
    To evaluate the effectiveness of the proposal, 85 EFP instances are prepared to cover various grammar topics, and are assigned to a total of 92 students in two universities in Myanmar and Indonesia to solve them using the recommendation function. Their solution results confirmed the effectiveness of the proposal.


    </sec>
    <sec>
    <title content-type="abstract-subheading">Originality/value</title>
    The concept of the difficulty level for an EFP instance is newly defined for the proper recommendation, and the accuracy in terms of the average numbers of answer submission times among the students is verified.


    </sec>

    DOI: 10.1108/ijwis-11-2020-0070

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  • Performance investigation of unit testing in Android programming learning assistance system Reviewed

    Yan Watequlis Syaifudin, Nobuo Funabiki, Devany C. Wijaya, Ikhlaashul Mu'aasyiqiin

    IEEE 3rd Global Conference on Life Sciences and Technologies (LifeTech 2021)   157 - 161   2021.3

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  • A Code Completion Problem in C Programming Learning Assistant System Reviewed

    Htoo Htoo Sandi Kyaw, Ei Ei Htet, Nobuo Funabiki, Minoru Kuribayashi, Thandar Myint, Phyu Phyu Tar, Nandar Win Min, Hnin Aye Thant, Phyu Hnin Wai

    2021 9TH INTERNATIONAL CONFERENCE ON INFORMATION AND EDUCATION TECHNOLOGY (ICIET 2021)   34 - 40   2021.3

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    C programming has been the fundamental subject to a lot of university students for studying programming languages, algorithms, and computer architecture. Currently, we are developing C programming learning assistant system (CPLAS) for its self-study by extending our works of JPLAS for Java programming. JPLAS provides the code completion problem (CCP) to offer practical programming exercises. A CCP instance asks the completion of the given source code by filling in the missing elements. The correctness of the answer is marked through string matching by comparing each answer statement with the correct one. In this paper, we present the CCP by extending our works of the element fill-in-blank problem (EFP) in CPLAS. For evaluations, we generated 10 CCP instances and assigned them to 54 undergraduate students in Myanmar and Japan. Their solution results show that the CCP instances are generally suitable for C programming study by novice students, but those on pointer need improvements for better solutions.

    DOI: 10.1109/ICIET51873.2021.9419621

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  • An implementation of multiple activities topic for learning Intent and Fragment in Android programming learning assistance system Reviewed

    Yan Watequlis Syaifudin, Nobuo Funabiki, Ikhlaashul Mu’aasyiqiin, Devany Christina Wijaya

    International Conference on Information and Education Technology (ICIET 2021)   6 - 13   2021.3

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  • Blending Android programming learning assistance system into online Android programming course Reviewed

    Yan Watequlis Syaifudin, Siti Rohani, Nobuo Funabiki, Pramana Yoga Saputra

    Blending Android programming learning assistance system into online Android programming course   26 - 33   2021.3

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  • An Improvement of Value Trace Problems for Pointer Study in C Programming. Reviewed

    Xiqin Lu, Nobuo Funabiki, Htoo Htoo Sandi Kyaw, Shune Lae Aung, Nem Khan Dim

    3rd IEEE Global Conference on Life Sciences and Technologies(LifeTech)   148 - 152   2021.3

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    DOI: 10.1109/LifeTech52111.2021.9391784

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  • A Study of Grammar-Concept Understanding Problem for C Programming Learning. Reviewed

    Xiqin Lu, Soe Thandar Aung, Htoo Htoo Sandi Kyaw, Nobuo Funabiki, Shune Lae Aung, Thin Thin Soe

    3rd IEEE Global Conference on Life Sciences and Technologies(LifeTech)   158 - 161   2021.3

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    DOI: 10.1109/LifeTech52111.2021.9391812

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  • A proposal of static job scheduling algorithm considering CPU core utilization for user-PC computing system Reviewed

    Ariel Kamoyedji, Nobuo Funabiki, Hein Htet, Minoru Kuribayashi

    International Conference on Information and Education Technology (ICIET 2021)   374 - 379   2021.3

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  • An implementation of offline answering function for code completion problem in programming learning assistant system Reviewed

    Htoo Htoo, Sandi Kyaw, Nobuo Funabiki, Minoru Kuribayashi

    IEEE 3rd Global Conference on Life Sciences and Technologies (LifeTech 2021)   166 - 169   2021.3

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  • Joint Optimization Method of Channel Assignment and Transmission Power for Concurrently Communicating Multiple Access-Points in Wireless Local-Area Network.

    Hendy Briantoro, Nobuo Funabiki, Md. Mahbubur Rahman, Kwenga Ismael Munene, Minoru Kuribayashi, Wen-Chung Kao

    International Journal of Networking and Computing   11 ( 2 )   251 - 266   2021

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  • Immunization of Pruning Attack in DNN Watermarking Using Constant Weight Code.

    Minoru Kuribayashi, Tatsuya Yasui, Asad Malik, Nobuo Funabiki

    CoRR   abs/2107.02961   2021

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  • An Implementation of Offline Answering Function for Code Completion Problem in PLAS.

    Htoo Htoo Sandi Kyaw, Nobuo Funabiki, Minoru Kuribayashi

    3rd IEEE Global Conference on Life Sciences and Technologies(LifeTech)   162 - 165   2021

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    Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/LifeTech52111.2021.9391894

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  • White-Box Watermarking Scheme for Fully-Connected Layers in Fine-Tuning Model.

    Minoru Kuribayashi, Takuro Tanaka, Shunta Suzuki, Tatsuya Yasui, Nobuo Funabiki

    IH&MMSec '21: ACM Workshop on Information Hiding and Multimedia Security(IH&MMSec)   165 - 170   2021

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    DOI: 10.1145/3437880.3460402

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  • Feature Extraction Based on Denoising Auto Encoder for Classification of Adversarial Examples.

    Yuma Yamasaki, Minoru Kuribayashi, Nobuo Funabiki, Huy H. Nguyen, Isao Echizen

    Asia-Pacific Signal and Information Processing Association Annual Summit and Conference   1815 - 1820   2021

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  • Feature Extraction Suitable for Double JPEG Compression Analysis Based on Statistical Bias Observation of DCT Coefficients

    Daichi Takeshita, Minoru Kuribayashi, Nobuo Funabiki

    2021 ASIA-PACIFIC SIGNAL AND INFORMATION PROCESSING ASSOCIATION ANNUAL SUMMIT AND CONFERENCE (APSIPA ASC)   1808 - 1814   2021

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    Photographs taken by smartphones and camera devices are generally compressed using JPEG by default when they are saved. If such an image is edited, it is decompressed and processed, and then recompressed through JPEG. Therefore, an edited image must be compressed by JPEG more than once. Using this characteristic, a forensic technique has been studied to detect image tampering by detecting distortions caused by double compression. In our previous study, to analyze the JPEG compression history using a convolutional neural network and (CNN), we observed a histogram calculated from the low-frequency components in 8 x 8 sized blocks of images having a pixel resolution of 512 x 512. However, there have been no detailed considerations regarding the range of observed histograms or the selection of DCT coefficients used to extract the features from a given image. In this study, we first examine the range of histograms to measure the usefulness of the classification of double JPEG-compressed images, and then examine the classification accuracy by increasing the number of DCT coefficients observed in the low-to mid-frequency components. Our experiment results indicate that [-40, 40] is an appropriate range for observing a histogram, and the selection of DCT coefficients strongly depends on the image size because of the difference in the amount of useful statistical information available.

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  • Application of throughput drop estimation model under partially overlapping channels to channel assignment in IEEE 802.11n WLAN Reviewed

    Kwenga Ismael Munene, Nobuo Funabiki, Hendy Briantoro, Md. Mahbubur Rahman, Fatema Akhter, and Minoru Kuribayashi

    Proceedings of 2020 International Conference on Emerging Technologies for Communications (ICETC 2020)   2020.12

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  • A proposal of throughput allocation method for concurrently communicating two or three hosts in wireless local-area network Reviewed

    Md. Mahbubur Rahman, Nobuo Funabiki, Kwenga Ismael Munene, Hendy Briantoro, Fatema Akhter, Minoru Kuribayashi, and Md. Manowarul Islam

    Proceedings of 2020 International Conference on Emerging Technologies for Communications (ICETC 2020)   2020.12

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  • An implementation of user-PC computing system using Docker container Reviewed

    Hein Htet, Nobuo Funabiki, Ariel Kamoyedji, Minoru Kuribayashi, Fatema Akhter, Wen-Chung Kao

    International Journal of Future Computer and Communication (IJFCC)   9 ( 4 )   66 - 73   2020.12

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  • A study of value trace problems for code reading study of C programming Reviewed

    Xiqin Lu, Nobuo Funabiki, Htoo Htoo Sandi Kyaw, Shune Lae Aung, and Nem Khan Dim

    Proceedings of 11th International Workshop on Advances in Networking and Computing (WANC 2020)   445 - 459   2020.11

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  • A Study of Value Trace Problems for Code Reading Study of C Programming

    Lu Xiqin, Nobuo Funabiki, Htoo Htoo Sandi Kyaw, Shune Lae Aung, Nem Khan Dim

    Proceedings - 2020 8th International Symposium on Computing and Networking Workshops, CANDARW 2020   455 - 459   2020.11

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    Nowadays, C programming is educated in many universities as the first computer language. It is also essential for studying algorithms and computer architecture. However, a lot of students find difficulty in the study, since it is not familiar to read and understand a C source code. Previously, Java programming learning assistant system (JPLAS) has been developed to assist Java programming study. It offers the value trace problem (VTP) for code reading study. A VTP instance consists of a source code and a set of questions, where each question asks the value of an important variable or the output message in the code. The correctness of an answer is marked through string matching with the correct one. In this paper, we study the value trace problem (VTP) for C programming. 40 VTP instances are generated using source codes for basic grammar concepts, fundamental data structures and algorithms in textbooks or websites. The application results to 25 students using the offline answering function confirm the effectiveness in detecting understanding levels of students and hard problems for them.

    DOI: 10.1109/CANDARW51189.2020.00093

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  • Transmission Power Optimization of Concurrently Communicating Two Access Points in Wireless Local Area Network. Reviewed

    Hendy Briantoro, Nobuo Funabiki, Minoru Kuribayashi, Kwenga Ismael Munene, Rahardhita Widyatra Sudibyo, Md. Manowarul Islam, Wen-Chung Kao

    Int. J. Mob. Comput. Multim. Commun.   11 ( 4 )   1 - 25   2020.10

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    DOI: 10.4018/IJMCMC.2020100101

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  • A proposal of transmission power optimization method for concurrently communicating two access-points in wireless local-area network Reviewed

    Hendy Briantoro, Nobuo Funabiki, Kwenga Ismael Munene, Rahardhita Widyatra Sudibyo, Minoru Kuribayashi, and Wen-Chung Kao

    Proceedings of 2020 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW 2019)   2020.9

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  • A proposal of code amendment problem in Java programming learning assistant system Reviewed

    10 ( 10 )   751 - 756   2020.9

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  • A code completion problem in Java programming learning assistant system Reviewed

    Htoo Htoo Sandi Kyaw, Su Sandy Wint, Nobuo Funabiki, and Wen-Chung Kao

    IAENG International Journal of Computer Science   47 ( 3 )   350 - 359   2020.8

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  • A proposal of exercise and performance learning assistant system for self-practice at home Invited Reviewed

    Irin Tri Anggraini, Achmad Basuki, Nobuo Funabiki, Xiqin Lu, Chih Peng Fan, Yu Chung Hsu, Cheng Hsien Lin

    Advances in Science, Technology and Engineering Systems   5 ( 5 )   1196 - 1203   2020.5

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    Due to pandemic spreads of COVID-19 and increasing populations of seniors, exercises or performance practices at home have become important to maintain healthy lives around the world. World Health Organization (WHO) has announced the physical health determines the Quality of Life (QoL) of a human. Unfortunately, a lot of people have no exercise and may be in unhealthy conditions. In this paper, we propose an Exercise and Performance Learning Assistant System (EPLAS) to assist people practicing exercises or learning performances by themselves at home. EPLAS adopts inexpensive devices and free software for low-cost implementation. It offers a video content of model actions by an instructor to be followed by the user, where the reaction is rated by comparing the feature points of the human bodies extracted by an open-source software OpenPose. For evaluations, we conduct experiments of applying EPLAS with five Yoga poses to 41 persons in Indonesia, Japan, and Taiwan, and confirm the effectiveness of the proposal.

    DOI: 10.25046/aj0505145

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  • A generalized TCP fairness control method for multiple-host concurrent communications in elastic WLAN system using Raspberry Pi access-point Reviewed

    Rahardhita Widyatra Sudibyo, Nobuo Funabiki, Minoru Kuribayashi, Kwenga Ismael Munene, Hendy Briantoro, Md. Manowarul Islam, Wen-Chung Kao

    International Journal of Mobile Computing and Multimedia Communications (IJMCMC)   11 ( 2 )   18 - 40   2020.4

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    DOI: 10.4018/IJMCMC.2020040102

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  • An Implementation and Evaluation of Advanced Widgets Topic for Interactive Application Stage in Android Programming Learning Assistance System Reviewed

    Yan Watequlis Syaifudin, Nobuo Funabiki, Minoru Kuribayashi

    ICIET 2020: 2020 8TH INTERNATIONAL CONFERENCE ON INFORMATION AND EDUCATION TECHNOLOGY   88 - 93   2020.3

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    With the growing popularity of smartphone devices, the demand for mobile application programmers has been increasing, particularly for the most popular mobile platform Android. Then, Android application programming has become one of the most important subjects that students should learn in professional schools and universities in IT departments. To assist self-studies of students, we have developed Android Programming Learning Assistance System (APLAS). To guide students to reach correct answers for given assignments, APLAS adopts the Test-Driven Development (TDD) method to validate student answers automatically using JUnit and Robolectric. The learning model for APLAS consists of four stages where each stage has several topics. In this paper, we implement Advanced Widgets as the second topic in the Interactive Application stage and evaluate it through applications to students in an IT department in Indonesia.

    DOI: 10.1145/3395245.3396198

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  • An extension of code correction problem for Java programming learning assistant system Reviewed

    Nobuo Funabiki, Masaki Yamaguchi, Minoru Kuribayashi, Htoo Htoo Sandi Kyaw, Su Sandy Wint, Soe Thandar Aung, and Wen-Chung Kao

    Proceedings of 2020 8th International Conference on Information and Education Technology (ICIET 2020)   110 - 115   2020.3

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  • A proposal of preprocessing stage for active access-point configuration algorithm in elastic WLAN system Reviewed

    Mousumi Saha, Nobuo Funabiki, Sumon Kumar Debnath, Wen-Chung Kao, Shigeto Tajima, and Teruo Higashino

    Proceedings of 2020 8th International Conference on Information and Education Technology (ICIET 2020)   284 - 289   2020.3

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  • A proposal of TCP fairness control method for multiple-host concurrent communications in wireless local-area network Reviewed

    Rahardhita Widyatra Sudibyo, Nobuo Funabiki, Kwenga Ismael Munene, Md. Manowarul Islam, and Wen-Chung Kao

    Proceedings of 2020 IEEE International Conference on Consumer Electronics (ICCE 2020)   2020.1

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  • Detection of Adversarial Examples Based on Sensitivities to Noise Removal Filter.

    Akinori Higashi, Minoru Kuribayashi, Nobuo Funabiki, Huy H. Nguyen, Isao Echizen

    Asia-Pacific Signal and Information Processing Association Annual Summit and Conference(APSIPA)   1386 - 1391   2020

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  • Classification of Video Recaptured from Display Device.

    Minoru Kuribayashi, Kodai Kamakari, Kento Kawata, Nobuo Funabiki

    Asia-Pacific Signal and Information Processing Association Annual Summit and Conference(APSIPA)   1381 - 1385   2020

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  • DeepWatermark: Embedding Watermark into DNN Model.

    Minoru Kuribayashi, Takuro Tanaka, Nobuo Funabiki

    Asia-Pacific Signal and Information Processing Association Annual Summit and Conference(APSIPA)   1340 - 1346   2020

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  • A Generalization of Transmission Power Optimization Method for Concurrently Communicating Multiple Access-Points in Wireless Local-Area Network. Reviewed

    Hendy Briantoro, Nobuo Funabiki, Kwenga Ismael Munene, Md. Mahbubur Rahman, Fatema Akhter, Wen-Chung Kao, Minoru Kuribayashi

    Eighth International Symposium on Computing and Networking Workshops   1 - 7   2020

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    DOI: 10.1109/CANDARW51189.2020.00015

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  • A Proposal of Air-Conditioning Guidance System Using Discomfort Index. Reviewed

    Samsul Huda, Nobuo Funabiki, Minoru Kuribayashi, Rahardhita Widyatra Sudibyo, Nobuya Ishihara, Wen-Chun Kao

    Advances on Broad-Band Wireless Computing, Communication and Applications - Proceedings of the 15th International Conference on Broad-Band and Wireless Computing, Communication and Applications (BWCCA-2020)(BWCCA)   154 - 165   2020

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    DOI: 10.1007/978-3-030-61108-8_15

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  • Near-Optimal Detection for Binary Tardos Code by Estimating Collusion Strategy Reviewed

    Tatsuya Yasui, Minoru Kuribayashi, Nobuo Funabiki, Isao Echizen

    IEEE Transactions on Information Forensics and Security   15   2069 - 2080   2020

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    DOI: 10.1109/tifs.2019.2956587

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  • A proposal of calligraphy learning assistant system with letter portion practice function using projection mapping. Reviewed

    Samsul Huda, Nobuo Funabiki, Minoru Kuribayashi, Wen-Chung Kao

    International Journal of Web Information Systems   16 ( 2 )   137 - 149   2020

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    DOI: 10.1108/IJWIS-07-2019-0032

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  • A proposal of recommendation function for solving element fill-in-blank problem in java programming learning assistant system Reviewed

    Funabiki, N., Matsumoto, S., Wint, S.S., Kuribayashi, M., Kao, W.-C.

    Advances in Intelligent Systems and Computing   1036   247 - 257   2020

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    DOI: 10.1007/978-3-030-29029-0_23

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  • Improvement of Bit Distribution of Binary Sequence Generated by Alternative Trace Map Function.

    Fatema Akhter, Tomoya Tatara, Yasuyuki Nogami, Takuya Kusaka, Nobuo Funabiki

    Eighth International Symposium on Computing and Networking Workshops   302 - 306   2020

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    DOI: 10.1109/CANDARW51189.2020.00066

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  • A Calligraphy Learning Assistant System with Letter Portion Practice Function Using Projection Mapping

    Samsul Huda, Nobuo Funabiki, Minoru Kuribayashi, Wen-Chung Kao

    2020 IEEE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS (ICCE)   489 - 490   2020

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    For decades, Calligraphy has been a popular artistic activity in Japan, China, and some countries. To assist its self-learning, we have proposed the Calligraphy Learning Assistant System (CLAS) using projection mapping, where a learner can practice it by following the letter writing video of a teacher projected on the paper. In this paper, we newly implement a letter portion practice function in CLAS, such that learners may practice their weak portions with the video showing the writing by a teacher. It is expected that to repeat practicing weak portions is useful in improving the whole letter writing. Through applications to 12 novice students from Indonesia, Myanmar, China, and Kenya, we confirm the effectiveness of this function, where each student has significantly improved the calligraphy skill.

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  • A Study of Value Trace Problems for Code Reading Study of C Programming.

    Xiqin Lu, Nobuo Funabiki, Htoo Htoo Sandi Kyaw, Shune Lae Aung, Nem Khan Dim

    Eighth International Symposium on Computing and Networking Workshops   455 - 459   2020

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    DOI: 10.1109/CANDARW51189.2020.00093

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  • Fill-a-pix puzzle as a SAT problem Reviewed

    Aye Myint Myat, Khine Khine Htwe, and Nobuo Funabiki

    Proceedings of The 3rd International Conference on Advanced Information Technologies (ICAIT2019)   244 - 249   2019.11

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  • A proposal of Yoga pose assessment method using pose detection for self-learning Reviewed

    Maybel Chan Thar, Khine Zar Ne Winn, and Nobuo Funabiki

    Proceedings of The 3rd International Conference on Advanced Information Technologies (ICAIT2019)   137 - 142   2019.11

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  • A proposal of entertainment and performance learning assistant system for seniors Reviewed

    Irin Tri Anggraini, Achmad Basuki, and Nobuo Funabiki

    Proceedings of 2019 International Electronics Symposium (IES)   14 - 18   2019.9

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  • Performance of an accelerometer-based wireless body area network in indoor environment: a preliminary study Reviewed

    Pradini Puspitaningayu, Nobuo Funabiki, Rahardhita Widyatra Sudibyo, Hendy Briantoro, Nurhayati, and Tri Wrahatnolo

    Proceedings of International Conference on Research and Academic Community Services (ICRACOS 2019)   2019.9

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  • A dynamic access-point transmission power minimization method using PI feedback control in elastic WLAN system for IoT applications Reviewed

    Md. Manowarul Islam, Nobuo Funabiki, Rahardhita Widyatra Sudibyo, Kwenga Ismael Munene, Wen-Chung Kao

    8   1 - 15   2019.8

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  • An informative test code approach in code writing problem for three object-oriented programming concepts in Java programming learning assistant system Reviewed

    Khin Khin Zaw, Win Zaw, Nobuo Funabiki, and Wen-Chung Kao

    IAENG International Journal of Computer Science   46 ( 3 )   445 - 453   2019.8

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  • A network configuration optimization algorithm for wireless local-area network with three Raspberry Pi access-points under concurrent communications Reviewed

    Mousumi Saha, Nobuo Funabiki, Rahardhita Widyatra Sudibyo, Sumon Kumar Debnath, Md. Manowarul Islam, Minoru Kuribayashi, and Wen-Chung Kao

    International Journal of Future Computer and Communication (IJFCC)   8 ( 2 )   55 - 62   2019.6

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  • An improvement of throughput measurement minimization method for access-point transmission power minimization in wireless local-area network Reviewed

    Md. Manowarul Islam, Nobuo Funabiki, Mousumi Saha, Kwenga Ismael Munene, Rahardhita Widyatra Sudibyo, and Wen-Chung Kao

    Proceedings of 2019 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW 2019)   2019.5

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  • Web-Server Implementation of Code Completion Problem for Java Programming Learning Assistant System Reviewed

    Htoo Htoo Sandi Kyaw, Nobuo Funabiki, Nobuya Ishihara, Minoru Kuribayashi, Wen-Chung Kao

    2019 IEEE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS - TAIWAN (ICCE-TW)   2019.5

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    To advance Java programming educations, Java Programming Learning Assistant System (JPLAS) has been developed and used in universities in Japan and Myanmar. JPLAS offers several types of programming exercises to cover different learning levels, including the element fill-in-blank problem (EFP) and the code completion problem (CCP). In CCP, an incomplete source code made by removing some elements is given to a student, and its completion is requested by filling in the missing elements properly. The answer is marked by comparing each statement with the corresponding one in the original code. In contrast to EFP, CCP does not show the locations of missing elements. In the trial, CCP has been implemented on offline JPLAS. Data exchange between a teacher and students in a Java programming course is made using USB memories, which takes large loads. In this paper, we implement CCP on the Web server for online JPLAS by extending the implementation of EFP. As well, the evaluations have confirmed the effectiveness of this implementation.

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  • A personal use vehicle anti-theft tracking system using IoT platform Reviewed

    Saw Nang Paing, May Zin Oo, Mazliza Othman, and Nobuo Funabiki

    International Journal of Computer & Software Engineering   4   2019.2

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  • A proposal of transmission power minimization extension in active access-point configuration algorithm for elastic wireless local-area network system Reviewed

    Md. Manowarul Islam, Nobuo Funabiki, Minoru Kuribayashi, Mousumi Saha, Kwenga Ismael Munene, Rahardhita Widyatra Sudibyo, and Wen-Chung Kao

    International Journal of Computer & Software Engineering   4   2019.2

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  • A proposal of Android Programming Learning Assistant System with implementation of basic application learning Reviewed

    Syaifudin, Y.W., Funabiki, N., Kuribayashi, M., Kao, W.-C.

    International Journal of Web Information Systems   16 ( 1 )   115 - 135   2019

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    DOI: 10.1108/IJWIS-08-2019-0038

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  • An extension of throughput drop estimation model for three-link concurrent communications under partially overlapping channels and channel bonding in ieee 802.11n wlan Reviewed

    Munene, K.I., Funabiki, N., Islam, M.M., Kuribayashi, M., Al Mamun, M.S., Kao, W.-C.

    Advances in Science, Technology and Engineering Systems   4 ( 4 )   94 - 105   2019

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    DOI: 10.25046/aj040411

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  • A proposal of TCP fairness control method for two-host concurrent communications in elastic WLAN system using raspberry pi access-point Reviewed

    Sudibyo, R.W., Funabiki, N., Kuribayashi, M., Munene, K.I., Manowarul Islam, Md., Kao, W.-C.

    Advances in Science, Technology and Engineering Systems   4 ( 6 )   76 - 80   2019

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    DOI: 10.25046/aj040602

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  • A proposal of calligraphy learning assistant system with letter portion practice function using projection mapping Reviewed

    Huda, S., Funabiki, N., Kuribayashi, M., Kao, W.-C.

    International Journal of Web Information Systems   1 - 2   2019

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    DOI: 10.1108/IJWIS-07-2019-0032

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  • Robust and secure data hiding for PDF text document Reviewed

    Kuribayashi, M., Fukushima, T., Funabiki, N.

    IEICE Transactions on Information and Systems   102-D ( 1 )   41 - 47   2019

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    DOI: 10.1587/transinf.2018MUP0003

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  • Throughput measurement and estimation model for concurrent communications of multiple raspberry pi access-points in wireless local-area network Reviewed

    Saha, M., Sudibyo, R.W., Funabiki, N., Kuribayashi, M., Debnath, S.K., Kao, W.-C.

    Journal of Communications   14 ( 11 )   1009 - 1009   2019

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    DOI: 10.12720/jcm.14.11.1009-1016

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  • Decentralized tracing protocol for fingerprinting system Reviewed

    Kuribayashi, M., Funabiki, N.

    APSIPA Transactions on Signal and Information Processing   8   1595 - 1601   2019

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    DOI: 10.1017/ATSIP.2018.28

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  • An Informative Test Code Approach in Code Writing Problem for Java Collections Framework in Java Programming Learning Assistant System. Reviewed

    Ei Ei Mon, Nobuo Funabiki, Minoru Kuribayashi, Wen-Chung Kao

    JSW   14 ( 5 )   200 - 208   2019

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    DOI: 10.17706/jsw.14.5.200-208

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  • Enhancements of minimax access-point setup optimisation approach for IEEE 802.11 WLAN. Reviewed

    Kyaw Soe Lwin, Nobuo Funabiki, Sumon Kumar Debnath, Kwenga Ismael Munene, Rahardhita Widyatra Sudibyo, Minoru Kuribayashi, Wen-Chung Kao

    IJSSC   9 ( 1 )   47 - 59   2019

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    DOI: 10.1504/IJSSC.2019.100017

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  • A Proposal of Calligraphy Learning Assistant System using Projection Mapping Reviewed

    HUDA Samsul, XIQIN Lu, FUNABIKI Nobuo, KURIBAYASHI Minoru

    電子情報通信学会技術研究報告   118 ( 211(MVE2018 12-24) )   10 - 15   2018.12

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  • Error debugging problem in Java Programming learning assistant system Reviewed

    Hsu Wai Hnin, Khin Khin Zaw, and Nobuo Funabiki

    Proceedings of The 9th International Conference on Science and Engineering 2018 (ICSE 2018)   293 - 297   2018.12

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  • Applications of minimax access-point setup optimization approach to IEEE802.11ac WLAN at 5GHz Reviewed

    Kyaw Soe Lwin, Zinan Wang, Nobuo Funabiki, MinoruKuribayashi, and Wen-Chung Kao

    Proceedings of The 2nd International Conference on Advanced Information Technologies (ICAIT2018)   132 - 138   2018.11

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  • Estimation of Collusion Attack in Bias-based Binary Fingerprinting Code Reviewed

    Tatsuya Yasui, Minoru Kuribayashi, Nobuo Funabiki, Isao Echizen

    2018 ASIA-PACIFIC SIGNAL AND INFORMATION PROCESSING ASSOCIATION ANNUAL SUMMIT AND CONFERENCE (APSIPA ASC)   1550 - 1555   2018.11

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    An optimal detector known as MAP detector has been proposed for the probabilistic fingerprinting codes such as Tardos and Nuida codes. However, it needs two kinds of important information. One is the collusion strategy which is used at the generation of a pirated codeword from colluders' codewords, and the other is the number of colluders. In this study, we propose an estimator which outputs these two parameters from a pirated codeword. At the estimation, we measure a bias in the pirated codeword by observing the number of symbols "0" and "1", and compare with possible bias patterns calculated from collusion strategies and number of colluders. As a result of computer simulation, it is confirmed that a collusion strategy and number of colluders can be estimated with high probability. In addition, it is revealed that the traceability of the detector using the proposed estimator is extremely close to the optimal detector.

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  • A throughput drop estimation model for two-link concurrent communications with partially overlapping channels in IEEE 802.11n WLAN Reviewed

    Kwenga Ismael Munene, Nobuo Funabiki, Rahardhita Widyatra Sudibyo, and Wen-Chung Kao

    Proceedings of The 7th IEEE Global Conference on Consumer Electronics (GCCE2018)   809 - 810   2018.10

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  • An informative test code approach for studying three object-oriented programming concepts by code writing problem in Java programming learning assistant system Reviewed

    Khin Khin Zaw, Nobuo Funabiki, Ei Ei Mon, and Wen-Chung Kao

    Proceedings of The 7th IEEE Global Conference on Consumer Electronics (GCCE2018)   592 - 596   2018.10

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  • IoT-Based vehicle anti-theft tracking system Reviewed

    Saw Nang Paing, May Zin Oo, Mazliza Othman, Nobuo Funabikio

    Proceedings of 2018 Joint International Conference on Science, Technology and Innovation, Mandalay (ICSTIM)   1 - 5   2018.10

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  • 最大クリーク問題に対するk-opt局所探索法の改良 Reviewed

    金原一歩, 片山謙吾, 岡野傑士, 尾崎 亮, 西原典孝, 舩曵信生

    電子情報通信学会論文誌 (A)   J101-A ( 10 )   260 - 264   2018.10

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  • MIMO host location optimization in active access-point configuration algorithm for elastic WLAN system Reviewed

    Sumon Kumar Debnath, Nobuo Funabiki, Mousumi Saha, and Md. Selim Al Mamun

    International Journal of Space-Based and Situated Computing (IJSSC)   8 ( 2 )   59 - 69   2018.8

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  • Universal scoring function based on bias equalizer for bias-based fingerprinting codes Reviewed

    Kuribayashi, M., Funabiki, N.

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   E101A ( 1 )   119 - 128   2018

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    DOI: 10.1587/transfun.E101.A.119

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  • Data hiding for text document in PDF file Reviewed

    Kuribayashi, M., Fukushima, T., Funabiki, N.

    Smart Innovation, Systems and Technologies   81   390 - 398   2018

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    DOI: 10.1007/978-3-319-63856-0_47

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  • A throughput estimation model under two-link concurrent communications with partially overlapping channels and its application to channel assignment in IEEE 802.11n WLAN. Reviewed

    Kwenga Ismael Munene, Nobuo Funabiki, Minoru Kuribayashi, Rahardhita Widyatra Sudibyo, Wen-Chung Kao

    IJSSC   8 ( 3 )   123 - 137   2018

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    DOI: 10.1504/IJSSC.2018.097286

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  • Efficient Decoding Algorithm for Cyclically Permutable Code. Reviewed

    Minoru Kuribayashi, Shodai Suma, Nobuo Funabiki

    IEEE Information Theory Workshop, ITW 2018, Guangzhou, China, November 25-29, 2018   1 - 5   2018

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    DOI: 10.1109/ITW.2018.8613319

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  • Fingerprinting for multimedia content broadcasting system Reviewed

    Kuribayashi, M., Funabiki, N.

    Journal of Information Security and Applications   41   52 - 61   2018

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    DOI: 10.1016/j.jisa.2018.06.002

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  • Dynamic Access-Point Configuration Approach for Elastic Wireless Local-Area Network System and Its Implementation Using Raspberry Pi. Reviewed

    Md. Manowarul Islam, Nobuo Funabiki, Minoru Kuribayashi, Sumon Kumar Debnath, Kwenga Ismael Munene, Kyaw Soe Lwin, Rahardhita Widyatra Sudibyo, Md. Selim Al Mamun

    Int. J. Netw. Comput.   8 ( 2 )   254 - 281   2018

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  • Watermarking with Fixed Decoder for Aesthetic 2D Barcode Reviewed

    Minoru Kuribayashi, Ee-Chien Chang, Nobuo Funabiki

    DIGITAL FORENSICS AND WATERMARKING, IWDW 2016   10082   379 - 392   2017

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    An aesthetic 2D-barcode, e.g. QR code, carries a given message in the payload and yet its visual appearance resembles another given logo image. The requirement of embedding a message in a "cover" image is similar to digital watermarking but with a crucial difference that, for the aesthetic 2D-barcode, the decoder is predetermined and fixed. Hence the designs and performances of the aesthetic 2D-barcode heavily rely on the predetermined decoder. In this paper, we focus on the underlying systematic encoding function in QR code. We first formulate a framework that optimizes the visual appearance of the codeword and yet meets the coding requirement. Since finding such an optimal codeword is computationally expensive, we next propose a heuristic to search for a feasible solution, and incorporate image processing operations to enhance the visual appearance. Although our method is designed for QR code, our approach can be applied to other 2D-barcodes that employ similar coding mechanisms of error correction code.

    DOI: 10.1007/978-3-319-53465-7_28

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  • Secure data management system with traceability against internal leakage. Reviewed

    Minoru Kuribayashi, Takahiro Ueda, Nobuo Funabiki

    2017 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA ASC 2017, Kuala Lumpur, Malaysia, December 12-15, 2017   1486 - 1494   2017

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  • A Design of Radio-controlled Submarine Modification for River Water Quality Monitoring Reviewed

    Sritrusta Sukaridhoto, Dadet Pramadihanto, Taufiqurrahman, Muhammad Alif, Andrie Yuwono, Nobuo Funabiki

    2015 INTERNATIONAL SEMINAR ON INTELLIGENT TECHNOLOGY AND ITS APPLICATIONS (ISITIA)   75 - 80   2015

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    In Indonesia, river water plays important roles in human life; for example, for transportation and economic activities of the inhabitants. However, industrial, agricultural and domestic water is discarded into rivers directly in many developing countries, since drainage systems have not been completely constructed. Water quality monitoring using radio-controlled submarine provide an opportunity to develop baseline monitoring system for river water ecosystem health indicator. We propose a design modification of radio-controlled submarine for river water quality monitoring. Our design consists of modification for navigation system by added external motor, IMU and GPS; modification of processing and control system by added micro controllers and mini pc, and modification of water sensors system.

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  • Anonymous Credential System with Efficient Proofs for Monotone Formulas on Attributes Reviewed

    Shahidatul Sadiah, Toru Nakanishi, Nobuo Funabiki

    ADVANCES IN INFORMATION AND COMPUTER SECURITY (IWSEC 2015)   9241   262 - 278   2015

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    An anonymous credential system allows a user to convince a service provider anonymously that he/she owns certified attributes. Previously, a system to prove AND and OR relations simultaneously by CNF formulas was proposed. To achieve a constant-size proof of the formula, this system adopts an accumulator that compresses multiple attributes into a single value. However, this system has a problem: the proof generation requires a large computational time in case of lots of OR literals in the formula. One of the example formulas consists of lots of birthdate attributes to prove age. This greatly increases the public parameters correspondent to attributes, which causes a large delay in the accumulator computation due to multiplications of lots of parameters. In this paper, we propose an anonymous credential system with constant-size proofs for monotone formulas on attributes, in order to obtain more efficiency in the proof generation. The monotone formula is a logic formula that contains any combination of AND and OR relations. Our approach to prove the monotone formula is that the accumulator is extended to be adapted to the tree expressing the monotone formula. Since the use of monotone formulas increases the expression capability of the attribute proof, the number of public parameters multiplied in the accumulator is greatly decreased, which impacts the reduction of the proof generation time.

    DOI: 10.1007/978-3-319-22425-1_16

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  • A Linux-PC Implementation Design for Elastic WLAN System Reviewed

    Md Ezharul Islam, Nobuo Funabiki

    2ND INTERNATIONAL CONFERENCE ON ELECTRICAL ENGINEERING AND INFORMATION COMMUNICATION TECHNOLOGY (ICEEICT 2015)   2015

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    For ubiquitous network services, wireless local-area network (WLAN) systems using plural access-points (APs) are often deployed in a network field. Then, a host may detect signals from multiple APs that are interfered. This redundancy can cause performance degradations and energy wastes if a small number of hosts participates the network. On the other hand, if many hosts participate there, the number of APs should be increased so that the sufficient communication quality is provided for each host. Thus, the WLAN system is expected to be adaptive and elastic to changes of host loads. In this paper, we present an idea of the elastic WLAN system and its implementation design using Linux-PCs. The key technology for this system is the use of the AP aggregation algorithm that has been proposed to minimize the number of active APs in the field by aggregating APs using the virtual AP technology. By using Linux tools and commands, this system collects necessary information for the algorithm input, and controls the APs based on the algorithm output. The implementation and evaluation of our proposal will be in future works.

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  • An Anonymous Reputation System with Reputation Secrecy for Manager Reviewed

    Toru Nakanishi, Tomoya Nomura, Nobuo Funabiki

    INFORMATION SECURITY AND CRYPTOLOGY - ICISC 2013   8565   363 - 378   2014

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    In anonymous reputation systems, where after an interaction between anonymous users, one of the user evaluates the peer by giving a rating. Ratings for a user are accumulated, which becomes the reputation of the user. By using the reputation, we can know the reliability of an anonymous user. Previously, anonymous reputation systems have been proposed, using an anonymous e-cash scheme. However, in the e-cash-based systems, the bank grasps the accumulated reputations for all users, and the fluctuation of reputations. These are private information for users. Furthermore, the timing attack using the deposit times is possible, which makes the anonymity weak. In this paper, we propose an anonymous reputation system, where the reputations of users are secret for even the reputation manager such as the bank. Our approach is to adopt an anonymous credential certifying the accumulated reputation of a user. Initially a user registers with the reputation manager, and is issued an initial certificate. After each interaction with a rater, the user as the ratee obtains an updated certificate certifying the previous reputation summed up by the current rating. The update protocol is based on the zero-knowledge proofs, and thus the reputations are secret for the reputation manager. On the other hand, due to the certificate, the user cannot maliciously alter his reputation.

    DOI: 10.1007/978-3-319-12160-4_22

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  • Revocable Group Signatures with Compact Revocation List Using Accumulators Reviewed

    Toru Nakanishi, Nobuo Funabiki

    INFORMATION SECURITY AND CRYPTOLOGY - ICISC 2013   8565   435 - 451   2014

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    Group signatures allow a group member to anonymously sign a message on behalf of the group. One of the important issues is the revocation, and lots of revocable schemes have been proposed so far. The scheme recently proposed by Libert et al. achieves that O(1) or O(log N) efficiency except for the revocation list size (also the revocation cost), for the total number of members N and the number of revoked members R. However, since a signature is required for each subset in the used subset difference method, the size is about 900R Bytes in the 128-bit security. In the case of R = 100,000, it amounts to about 80 MB. In this paper, we extend the scheme to reduce the revocation list (also the revocation cost). In the proposed scheme, an extended accumulator accumulates T subsets, which is signed for the revocation list. The revocation list size is reduced by 1/T, although the public key size, membership certificate size and the cost of a witness computation needed for signing increase related to T.

    DOI: 10.1007/978-3-319-12160-4_26

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  • Efficient proofs for CNF formulas on attributes in pairing-based anonymous credential system

    Nasima Begum, Toru Nakanishi, Nobuo Funabiki

    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)   7839   495 - 509   2013

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    To enhance user privacy, anonymous credential systems allow the user to convince a verifier of the possession of a certificate issued by the issuing authority anonymously. In the systems, the user can prove relations on his/her attributes embedded into the certificate. Previously, a pairing-based anonymous credential system with constant-size proofs in the number of attributes of the user was proposed. This system supports the proofs of the inner product relations on attributes, and thus can handle the complex logical relations on attributes as the CNF and DNF formulas. However this system suffers from the computational cost: The proof generation needs exponentiations depending on the number of the literals in OR relations. In this paper, we propose a pairing-based anonymous credential system with the constant-size proofs for CNF formulas and the more efficient proof generation. In the proposed system, the proof generation needs only multiplications depending on the number of literals, and thus it is more efficient than the previously proposed system. The key of our construction is to use an extended accumulator, by which we can verify that multiple attributes are included in multiple sets, all at once. This leads to the verification of CNF formulas on attributes. Since the accumulator is mainly calculated by multiplications, we achieve the better computational costs. © 2013 Springer-Verlag.

    DOI: 10.1007/978-3-642-37682-5_35

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  • Performance Evaluation of Check-By-Voting for Colluding Attack in Volunteer Computing Systems

    Kan Watanabe, Masaru Fukushi, Nobuo Funabiki, Toru Nakanishi

    Lecture Notes in Electrical Engineering   33 - 48   2012.12

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    DOI: 10.1007/978-94-007-5651-9_3

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  • A proposal of access-point aggregation approach for multiple wireless local area networks Reviewed

    Nobuo Funabiki, Md. Ezharul Islam, Toru Nakanishi, Kan Watanabe

    Proceedings - 2012 6th International Conference on Complex, Intelligent, and Software Intensive Systems, CISIS 2012   677 - 682   2012

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    With the advancement of communication technologies, multiple wireless local area networks (WLANs) have been often deployed in the same building for the Internet access services. Usually, their wireless access-points (APs) have been independently managed and operated by different groups such as departments or laboratories in a university or a company. Then, a WLAN user host can detect signals from multiple APs, which may increase the interference and the operation cost, and degrade the communication performance. As a result, the number of active APs should be minimized by aggregating the physical APs allocated in the field into limited ones by introducing virtual APs. In this paper, we define this AP aggregation problem for WLANs that aggregates the APs into the minimum number of active APs, and prove the NP-completeness of its decision problem. Then, we propose the heuristic algorithm that is composed of five phases. The effectiveness of our proposal has been verified through simulations in two instances. © 2012 Crown Copyright.

    DOI: 10.1109/CISIS.2012.121

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  • Cooking-step scheduling algorithm for simultaneous cooking of multiple dishes Reviewed

    Nobuo Funabiki, Yukiko Matsushima

    Lecture Notes in Electrical Engineering   110   123 - 136   2012

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    Nowadays, cooking everyday is hard for busy persons such as workers, students, and child-rearing families, because the time is limited on weekdays. At the same time, it is important for a healthy diet not to rely on eating-out and instant foods heavily. One solution to this situation is to cook dishes for the whole week on the weekend and eat them on the following weekdays. Then, the way of cooking with a good cooking-step schedule for multiple dishes is very important to save the time. In this chapter, we first propose a cooking model to estimate the cooking time accurately under various conditions including the kitchen layout and the number of cooks. Then, using this model, we propose a cooking-step scheduling algorithm for simultaneous cooking of multiple dishes under the cooking time constraint. Through experiments, we verify the effectiveness of our model and algorithm, where the cooking time difference between the model and the real cooking is only 2 min. © 2012 Springer Science+Business Media, LLC.

    DOI: 10.1007/978-1-4614-1695-1_10

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  • An Extension of Wireless Internet-Access Mesh Network Simulator for Use of Smart Antenna. Reviewed

    Nobuo Funabiki, Shigeto Tajima, Teruo Higashino, Toru Nakanishi, Kan Watanabe

    2012 Seventh International Conference on Broadband, Wireless Computing, Communication and Applications, Victoria, BC, Canada, November 12-14, 2012   517 - 522   2012

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    DOI: 10.1109/BWCCA.2012.91

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  • Anonymous IEEE802.1X Authentication System Using Group Signatures

    Sudarsono Amang, Nakanishi Toru, Nogami Yasuyuki, Funabiki Nobuo

    Information and Media Technologies   5 ( 2 )   751 - 764   2010

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    Recently, ubiquitous Internet-access services have been provided by Internet service providers (ISPs) by deploying wireless local area networks (LANs) in public spaces including stations, hotels, and coffee shops. The IEEE802.1X protocol is usually used for user authentications to allow only authorized users to access services. Then, although user personal information of access locations, services, and operations can be easily collected by ISPs and thus, their strict management has been demanded, it becomes very difficult when multiple ISPs provide roaming services by their corporations. In this paper, we present an anonymous IEEE802.1X authentication system using a group signature scheme to allow user authentication without revealing their identities. Without user identities, ISPs cannot collect personal information. As an efficient revocable group signature scheme, we adopt the verifier-local revocation (VLR) type with some modifications for use of the fast pairing computation. We show the implementation of our proposal and evaluation results where the practicality of our system is confirmed for up to 1, 000 revoked users.

    DOI: 10.11185/imt.5.751

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  • Anonymous IEEE802.1X authentication system using group signatures Reviewed

    Amang Sudarsono, Toru Nakanishi, Yasuyuki Nogami, Nobuo Funabiki

    Journal of Information Processing   18   63 - 76   2010

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    Recently, ubiquitous Internet-access services have been provided by Internet service providers (ISPs) by deploying wireless local area networks (LANs) in public spaces including stations, hotels, and coffee shops. The IEEE802.1X protocol is usually used for user authentications to allow only authorized users to access services. Then, although user personal information of access locations, services, and operations can be easily collected by ISPs and thus, their strict management has been demanded, it becomes very difficult when multiple ISPs provide roaming services by their corporations. In this paper, we present an anonymous IEEE802.1X authentication system using a group signature scheme to allow user authentication without revealing their identities. Without user identities, ISPs cannot collect personal information. As an efficient revocable group signature scheme, we adopt the verifier-local revocation (VLR) type with some modifications for use of the fast pairing computation. We show the implementation of our proposal and evaluation results where the practicality of our system is confirmed for up to 1,000 revoked users.

    DOI: 10.2197/ipsjjip.18.63

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  • A proposal of a web-page layout optimization method for multimodal browsing sizes Reviewed

    Nobuo Funabiki, Yosuke Isshiki, Megumi Isogai, Toru Nakanishi

    Digest of Technical Papers - IEEE International Conference on Consumer Electronics   894 - 898   2009

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    Recently, Web-page browsing opportunities at multimodal browsing sizes have increased due to developments of various terminals. Meanwhile, most Web pages have been designed to fit to the standard size. As a result, the screen scroll operation is necessary to access the main content at a small size, whereas the blank space becomes large at a large size. In this paper, we propose a Web-page layout optimization method for multimodal browsing sizes by focusing on the standard Web design style with the separation of the document structure description by an XHTML file and the appearance description by a CSS file. Our method automatically generates a set of CSS files fit to different sizes from the files designed for the standard size by a user. Then, it dynamically switches to the CSS file fit to the current browsing size using JavaScript. We confirm the practicality of our proposal through experiments of the Web page generation and access at various sizes. ©2009 IEEE.

    DOI: 10.1109/ISCE.2009.5156917

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  • A comparative study of open source softwares for virtualization with streaming server applications Reviewed

    Sritrusta Sukaridhoto, Nobuo Funabiki, Toru Nakanishi, Dadet Pramadihanto

    Digest of Technical Papers - IEEE International Conference on Consumer Electronics   577 - 581   2009

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    Currently, several streaming servers are available to provide a variety of multimedia applications such as VoD (Videoon-Demand), IP-phone, and IP-TV. As a result, the provision of multiple streaming servers on a single machine using the virtualization technology has become important in order to save the operational/management costs while enhancing the performance and the reliability of the system. In this paper, we show the performance evaluation of two representative open source softwares for the virtualization technology, Xen and OpenVZ, in various configurations of applications on three open source streaming servers, Red5, Darwin, and VLC. Our experimental results indicate that OpenVZ provides the better performance for streaming applications with Darwin and VLC whereas Red5 can run only on Xen. ©2009 IEEE.

    DOI: 10.1109/ISCE.2009.5156885

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  • Efficient revocable group signature schemes using primes Reviewed

    Toru Nakanishi, Nobuo Funabiki

    Journal of Information Processing   16   110 - 121   2008

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    Group signature schemes with membership revocation have been intensively researched. In this paper, we propose revocable group signature schemes with less computational costs for signing/verification than an existing scheme without the update of the signer's secret keys. The key idea is the use of a small prime number embedded in the signer's secret key. By using simple prime integer relations between the secret prime and the public product of primes for valid or invalid members, the revocation is efficiently ensured. To show the practicality, we implemented the schemes and measured the signing/verification times in a common PC (Core2 DUO 2.13 GHz). The times are all less than 0.5 seconds even for relatively large groups (10,000 members), and thus our schemes are sufficiently practical.

    DOI: 10.2197/ipsjjip.16.110

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  • Efficient Revocable Group Signature Schemes Using Primes

    Nakanishi Toru, Funabiki Nobuo

    Information and Media Technologies   3 ( 4 )   768 - 779   2008

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    Group signature schemes with membership revocation have been intensively researched. In this paper, we propose revocable group signature schemes with less computational costs for signing/verification than an existing scheme without the update of the signer's secret keys. The key idea is the use of a small prime number embedded in the signer's secret key. By using simple prime integer relations between the secret prime and the public product of primes for valid or invalid members, the revocation is efficiently ensured. To show the practicality, we implemented the schemes and measured the signing/verification times in a common PC (Core2 DUO 2.13GHz). The times are all less than 0.5 seconds even for relatively large groups (10, 000 members), and thus our schemes are sufficiently practical.

    DOI: 10.11185/imt.3.768

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  • A short anonymously revocable group signature scheme from decision linear assumption Reviewed

    Toru Nakanishi, Nobuo Funabiki

    Proceedings of the 2008 ACM Symposium on Information, Computer and Communications Security, ASIACCS '08   337 - 340   2008

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    In group signature schemes, a signature is anonymous for a verifier, while only a designated Privacy Manager (PM) can identify the signer. This identification is used for tracing a dishonest anonymous signer in case of an illegal act using the signature. However, PM can violate signers' anonymity. Recently, Brickell and Li propose a novel countermeasure for the anonymous dishonest signer without PM in the setting of the direct anonymous attestation. Here, we call the generalized group signature version anonymously revocable group signature scheme. In this scheme, after an illegal act using a group signature was found, the membership of the dishonest signer can be anonymously revoked for excluding the signer without the help of any PM. However, since the Brickell-Li scheme is based on the RSA assumption and the DDH assumption, the signature is long. In this paper, we propose a short anonymously revocable group signature scheme from supersingular curves, where we adopt the decision linear (DLIN) assumption. Compared to the simple adoption of the Brickell-Li DDH-based revoking approach to supersingular curves, the length of our signature is reduced to about from 30% to 60%. Copyright 2008 ACM.

    DOI: 10.1145/1368310.1368359

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  • Hierarchical Logical Topology in WDM Ring Networks with Limited ADM Reviewed

    KITANI T.

    Proceedings of the IFIP Networking 2008 (Networking 2008)   326 - 337   2008

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    DOI: 10.1007/978-3-540-79549-0_28

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  • A proposal of improved lip contour extraction method using deformable template matching and its application to dental treatment Reviewed

    Yujin Yokogawa, Nobuo Funabiki, Teruo Higashino, Masashi Oda, Yoshihide Mori

    Systems and Computers in Japan   38 ( 5 )   80 - 88   2007.5

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    Studies of facial parts have been conducted in recent years in various fields of medical science and psychology, including studies of the lip contour and location. In fact, in the treatment of cleft lip patients in oral surgery, it is desirable to extract the precise lip contour and to identify its location on the face in order to plan the plastic surgery procedure and to follow up the site after surgery. Aiming at applications to dental treatment, in this study we attempt to extend the lip contour extraction procedure based on the deformable template to the case of a template with left-right asymmetry. An algorithm is also proposed for adjusting the hue and value thresholds in order to improve extraction accuracy and reduce the burden on the user. The proposal is evaluated using sample images of normal subjects and cleft lip patients. It is shown that the shape and location of the lip can be extracted precisely and automatically by the proposed method. In connection with application to dental clinics, we present an example of a quantitative evaluation of the lip shape by using the parameters extracted by the proposed method. © 2007 Wiley Periodicals, Inc.

    DOI: 10.1002/scj.10668

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  • Proposal of a hierarchical heuristic algorithm for node assignment in bidirectional manhattan street networks Reviewed

    Masataka Yonezu, Nobuo Funabiki, Tomoya Kitani, Tokumi Yokohira, Toru Nakanishi, Teruo Higashino

    Systems and Computers in Japan   38 ( 4 )   74 - 83   2007.4

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    In wavelength division multiplexing (WDM) technology, high-speed large-capacity communication is realized by transmitting multiple optical signals with different wavelengths in parallel on an optical fiber. In WDM technology, the logical topology of the network can generally be modified by changing the wavelength assignment to the transmitters and receivers. Thus it is important to develop an algorithm that derives the wavelength assignment that maximizes the transmission efficiency of the network. This paper considers a bidirectional Manhattan street network which has a regular topology, and proposes a hierarchical two-stage heuristic algorithm. In the first stage, the initial solution is derived by hierarchical region division and node assignment to the regions. In the second stage, the solution is improved by simulated annealing (SA). The proposed algorithm is evaluated by simulations of random instances and instances for which optimal solutions are already known. The effectiveness of the proposed algorithm is demonstrated through comparisons to the existing one. © 2007 Wiley Periodicals, Inc.

    DOI: 10.1002/scj.10534

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  • A channel configuration problem for access-point communications in wireless mesh networks Reviewed

    Nobuo Funabiki, Toru Nakanishi, Walaa Hassan, Kanako Uemura

    2007 15TH IEEE INTERNATIONAL CONFERENCE ON NETWORKS   466 - 471   2007

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    For a flexible and inexpensive large-scale access network to the Internet, we have studied the wireless mesh network composed of access points (APs) as wireless routers. Each AP has multihop wireless connections with the others by the wireless distribution system (WDS). In this network, communications around Internet gateways are usually very crowded and become the bottleneck of performance, because most traffic go through there for access to the Internet. To avoid this problem, the proper channel configurations of APs concerning multiple network interface cards (NICs) and their channel assignments are essential, where for the given network and traffics, the throughput should be maximized while the cost for channel configurations be minimized. In this paper, we formulate this channel configuration problem for AP communications in the wireless mesh network, and present its two-stage heuristic algorithm. The effectiveness of our approach is verified through extensive simulations.

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  • Group signature schemes with membership revocation for large groups Reviewed

    Toru Nakanishi, Nobuo Funabiki

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E89A ( 5 )   1275 - 1283   2006.5

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    Group signature schemes with membership revocation have been intensively researched. However, signing and/or verification of some existing schemes have computational costs of O(R), where R is the number of revoked members. Existing schemes using a dynamic accumulator or a similar technique have efficient signing and verifications with O(1) complexity. However, before signing, the signer has to modify his secret key with O(N) or O(R) complexity, where N is the group size. Therefore, for larger groups, signers suffer from enormous costs. On the other hand. an efficient scheme for middle-scale groups with about 1,000 members is previously proposed, where the signer need not modify his secret key. However this scheme also suffers from heavy signing/verification costs for larger groups with more than 10,000 members. In this paper, we adapt the middle-scale scheme to larger groups ranging from 1,000 to 1.000.000 members. At the sacrifice of the group manager's slight cost, our signing/verification is sufficiently efficient.

    DOI: 10.1093/ietfec/e89-a.5.1275

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  • A short verifier-local revocation group signature scheme with backward unlinkability Reviewed

    Toru Nakanishi, Nobuo Funabiki

    ADVANCES IN INFORMATION AND COMPUTER SECURITY, PROCEEDINGS   4266   17 - 32   2006

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    Previously Verifier-Local Revocation (VLR) group signature schemes from bilinear maps were proposed. In VLR schemes, only verifiers are involved in the revocation of a member, while signers are not involved in the revocation. Thus, the schemes are suitable for mobile environments. Furthermore, the previously proposed schemes satisfy an important property, the backward unlinkability. It means that even after a member is revoked, signatures produced by the member before the revocation remain anonymous. This property is needed in case a member leaves voluntarily or in case of a stolen key. In this paper an improved scheme is proposed, where the group signatures are shorter. This is achieved using a different assumption, DLDH assumption, and improving zero-knowledge proofs in the group signatures. The length of the proposed group signatures is about 53% of that of the previous ones.

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  • An optical-drop wavelength assignment algorithm for efficient wavelength reuse under heterogeneous traffic in WDM ring networks Reviewed

    Nobuo Funabiki, Jun Kawashima, Toru Nakanishi, Kiyohiko Okayama, Teruo Higashino

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   E88-A ( 5 )   1234 - 1240   2005

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communication, Engineers, IEICE  

    The wavelength-division multiplexing (WDM) technology has been popular in communication societies for providing very large communication bands by multiple lightpaths with different wavelengths on a single optical fiber. Particularly, a double-ring optical network architecture based on the packet-over-WDM technology such as the HORNET architecture, has been extensively studied as a next generation platform for metropolitan area networks (MANs). Each node in this architecture is equipped with a wavelength-fixed optical-drop and a fast tunable transmitter so that a lightpath can be established between any pair of nodes without wavelength conversions. In this paper, we formulate the optical-drop wavelength assignment problem (ODWAP) for efficient wavelength reuse under heterogeneous traffic in this network, and prove the JVP-completeness of its decision problem. Then, we propose a simple heuristic algorithm for the basic case of ODWAP. Through extensive simulations, we demonstrate the effectiveness of our approach in reducing waiting times for packet transmissions when a small number of wavelengths are available to retain the network cost for MANs. Copyright © 2005 The Institute of Electronics, Information and Communication Engineers.

    DOI: 10.1093/ietfec/e88-a.5.1234

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  • Verifier-local revocation group signature schemes with backward unlinkability from bilinear maps Reviewed

    Toru Nakanishi, Nobuo Funabiki

    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)   3788   533 - 548   2005

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    An approach of membership revocation in group signatures is verifier-local revocation (VLR for short). In this approach, only verifiers are involved in the revocation mechanism, while signers have no involvement. Thus, since signers have no load, this approach is suitable for mobile environments. Although Boneh and Shacham recently proposed a VLR group signature scheme from bilinear maps, this scheme does not satisfy the backward unlikability. The backward unlikability means that even after a member is revoked, signatures produced by the member before the revocation remain anonymous. In this paper, we propose VLR group signature schemes with the backward unlinkability from bilinear maps. © International Association for Cryptologic Research 2005.

    DOI: 10.1007/11593447_29

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  • A proposal of hierarchical chordal ring network topology for WDM networks Reviewed

    Tomoya Kitani, Nobuo Funabiki, Teruo Higashino

    Proceedings - IEEE International Conference on Networks, ICON   2   605 - 609   2004

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    This paper presents a hierarchical chordal ring network topology (HCRN) as a regular logical topology for multihop WDM networks. In order to minimize the traffic increase and the transmission delay through the network due to packet relays or hops on intermediate nodes in the multihop network, the network topology is hierarchically constructed in HCRN, so that more lightpaths are assigned to connections between nearby nodes than those for distant nodes, while the maximum hop between any pair of nodes is restrained. This hierarchical topology is also beneficial to reduce the number of required wavelengths through increasing their reuses by multiple lightpaths, which is important for cost-conscious metropolitan area networks. Through comparisons on the network diameter and the number of required wavelengths with the original chordal ring network topology, we show the effectiveness of our proposed HCRN. © 2004 IEEE.

    DOI: 10.1109/ICON.2004.1409241

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  • A Test Sequence Generation Method for Communication Protocols Using the SAT Algorithm Reviewed

    Takanori Mori, Hirotaka Otsuka, Nobuo Funabiki, Akio Nakata, Teruo Higashino

    Systems and Computers in Japan   34 ( 11 )   20 - 29   2003.10

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    The specification for a communication protocol is generally represented by a finite-state machine, and the operation of the machine is represented by transitions among states. The device implementing such specification is called the implementation under test (IUT). It is important for the IUT that its operation should be verified for all state transitions on the finite-state machine given in the specification. This test is called the conformance testing. In such testing it is important to generate efficiently a route containing all state transitions from the initial state. This problem is called the test sequence generation problem. This paper considers the test sequence generation problem for a communication protocol and proposes an application of an algorithm for satisfiability problem (SAT) that can flexibly handle various constraints, such as the order constraint and the time constraint among multiple constraints. The proposed method is applied to the dynamic host configuration protocol (DHCP) and its effectiveness is demonstrated. © 2003 Wiley Periodicals, Inc.

    DOI: 10.1002/scj.10482

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  • A neural network combined two-stage algorithm for route assignment problems with reliability satisfaction in multihop radio networks Reviewed

    T Baba, N Funabiki, S Tajima

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE   85 ( 6 )   63 - 73   2002

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SCRIPTA TECHNICA-JOHN WILEY & SONS  

    The radio network is a large-scale communication network in which a large number of stations are distributed over a wide area. Each station can communicate directly by radio packets only with neighborhood stations. Packet communication between stations which cannot communicate directly is realized by passing packets through multiple stations between them. For this purpose, when a packet communication request arises, the route for the packet and the transfer timing must be chosen so that the total transfer time is minimized and the efficiency of the radio network is maximized. It should be noted that the reliability, representing the probability that the required performance is achieved, fluctuates among the stations in the network due to the differences in the time of installation, the designed performance, and communication congestion. Consequently, this paper proposes a two-stage algorithm in which the route is assigned so that its reliability is larger than the required value. The proposed algorithm is composed of the iterative reliability satisfaction extraction procedure, in which a set of path candidates satisfying the reliability condition for the given transfer request, and the greedy neural network procedure, in which the route minimizing the cost is selected from the set of path candidates. The effectiveness of the proposed algorithm is demonstrated by simulation for networks with up to 500 stations. (C) 2002 Scripta Technica.

    DOI: 10.1002/ecjc.1102

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  • A global routing technique for Wave-Steered circuits

    *Nobuo Funabiki, Amit Singh, Arindam Mukherjee, Malgorzata Marek-Sadowska

    Proc. of Euromicro Symposium on Digital Design (DSD’2001)   2001.9

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  • A minimal-state processing search algorithm for satisfiability problems Reviewed

    Nobuo Funabiki, Tokumi Yokohira, Toru Nakanishi, Shigeto Tajima, Teruo Higashino

    Proceedings of the IEEE International Conference on Systems, Man and Cybernetics   4   2769 - 2774   2001

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    The satisfiability problem (SAT) is a typical NP-complete problem where a wide range of applications has been studied. Given a set of variables U and a set of clauses C, the goal of SAT is to find a truth assignment to variables in U such that every clause in C is satisfied if it exits, or to derive the infeasibility otherwise. This paper presents an approximation algorithm called a minimal-state processing search algorithm for SAT (MIPS_SAT). MIPS_SAT repeatedly transits minimal states in terms of the cost function for searching a solution through a construction stage and a refinement stage. The first stage greedily generates an initial state composed of as many satisfied clauses as possible. The second stage iteratively seeks a solution while keeping state minimality. The performance of MIPS_SAT is verified through solving DIMACS benchmark instances.

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  • Expanded maximum neural network algorithm for a channel assignment problem in cellular radio networks Reviewed

    Katsuyoshi Ikenaga, Yoichi Takenaka, Nobuo Funabiki

    Electronics and Communications in Japan, Part III: Fundamental Electronic Science (English translation of Denshi Tsushin Gakkai Ronbunshi)   83 ( 11 )   11 - 19   2000

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    In this paper, we propose a neural network algorithm that uses the expanded maximum neuron model to solve the channel assignment problem of cellular radio networks, which is an NP-complete combinatorial optimization problem. The channel assignment problem demands minimizing the total interference between the assigned channels needed to satisfy all of the communication needs. The proposed expanded maximum neuron model selects multiple neurons in descending order from the neuron inputs in each neuron group. As a result, the constraints will always be satisfied for the channel assignment problem. To improve the accuracy of the solution, neuron fixing, which is a heuristic technique used in the binary neuron model, a hill-climbing term, a shaking term, and an Omega function are introduced. The effectiveness of these additions to the expanded maximum neuron model algorithm is demonstrated. Simulations of benchmark problems demonstrate the superior performance of the proposed algorithm over conventional algorithms in finding the solution.

    DOI: 10.1002/(SICI)1520-6440(200011)83:11<11::AID-ECJC2>3.0.CO;2-D

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  • A neural network for one-shot scheduling problems in multicast packet switching systems Reviewed

    T Baba, N Funabiki, S Nishikawa

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE   83 ( 3 )   12 - 21   2000

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    In a multicast packet switching system, multiple output ports can send out packets simultaneously by means of the packet copying function. In realizing such a switching system, the transmission pattern must be determined for successively arising transfer requests, so that the number of transmitted packets is maximized, while satisfying the constraints. This paper considers the one-shot scheduling problem formulated by Chen and colleagues, where all copies of the same packet are sent at the same time, and proposes a new solution method using a neural network. In the proposed solution method using the neural network, the binary neuron, which is suited to the digital techniques and hardware implementation, is employed together with the synchronous update scheme. In order to improve the convergence performance and the accuracy of the solution, an operational equation with an additional heuristic term and a coefficient setting procedure taking account of transfer requests are proposed. By simulations for cases of up to 1000 ports, it is shown that the proposed solution method using the neural network is better in deriving the solution than the conventional method. It is also shown that the considered problem is NP-hard. (C) 1999 Scripta Technica.

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  • A maximum neural network approach for N-queens problems

    FUNABIKI N.

    Biol Cybern   76   251 - 255   1997.6

  • Maximum Neural Network Algorithms for N - Queen Problems

    TAKENAKA Yoichi, FUNABIKI Nobuo, NISHIKAWA Seishi

    Transactions of Information Processing Society of Japan   37 ( 10 )   1781 - 1788   1996.10

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    This paper presents maximum neural network algorithms for N-queen problems using the maximum neuron model. The maximum neuron model is proposed by Takefuji et al. in order to provide efficient neural network solutions for combinatorial optimization problems. In this model, one and only one neuron id always fired in each group of neurons, which can not only reduce the searching space drastically but also save the computation load. The simulation results show that the performance of our maximum neural network surpasses the existing neural network for the same problem. Particularly, the maximum neural network in shown to be much suitable for the semi-synchronous computation.

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    Other Link: http://id.nii.ac.jp/1001/00013567/

  • A binary neural network approach for link activation problems in multihop radio networks Reviewed

    N Funabiki, S Nishikawa

    IEICE TRANSACTIONS ON COMMUNICATIONS   E79B ( 8 )   1086 - 1093   1996.8

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    This paper presents a binary neural network approach for link activation problems in multihop radio networks. The goal of the NP-complete problems is to find a conflict-free link activation schedule with the minimum number of time slots for specified communication requirements. The neural network is composed of NxM binary neurons for scheduling N links in M time slots. The energy functions and the motion equations are newly defined with heuristic methods. The simulation results through 14 instances with up to 419 links show that the neural network not only surpasses the best existing neural network in terms of the convergence rate and the computation time, but also can solve large scale instances within a constant number of iteration steps.

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  • A parallel neural network computing for the maximum clique problem

    Lee Kuo Chun, Funabiki Nobuo, Cho Y. B, Takefuji Yoshiyasu

    905 - 910   1991

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    &lt;p&gt;A novel computational model for large-scale maximum clique problems is proposed and tested. The maximum clique problem is first formulated as an unconstrained quadratic zero-one programming and it is solved by minimizing the weight summation over the same partition in a newly constructed graph. The proposed maximum neural network has the following advantages: (1) coefficient-parameter tuning in the motion equation is not required in the maximum neural network while the conventional neural networks suffer from it; (2) the equilibrium state of the maximum neural network is clearly defined in order to terminate the algorithm, while the existing neural networks do not have the clear definition; and (3) the maximum neural network always allows the state of the system to converge to the feasible solution, while the existing neural networks cannot guarantee it. The proposed parallel algorithm for large-size problems outperforms the best known algorithms in terms of computation time with much the same solution quality where the conventional branch-and-bound method cannot be used due to the exponentially increasing computation time.&lt;/p&gt;

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  • A maximum neural network for the max cut problem

    Lee Kuo Chun, Takefuji Yoshiyasu, Funabiki Nobuo

    379 - 384   1991

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    &lt;p&gt;The max cut problem, one of the NP-complete problems, was chosen to test the capability of an artificial neural network. The algorithm based on the maximum neural network was tested by 1000 randomly generated examples, including up to 300 vertex problems. The simulation result shows that the proposed parallel algorithm using the maximum neural network generates better solutions than Hsu&#039;s algorithm within one hundred iteration steps, regardless of the problem size.&lt;/p&gt;

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  • Analog maximum neural network circuits using the switched capacitor technique

    Cho Yong Beom, Lee Kuo Chun, Takefuji Yoshiyasu, Funabiki Nobuo

    1906 - 1911   1991

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    &lt;p&gt;The circuit of the maximum neural network based on the switched capacitor technique is proposed. The performance of the proposed circuit was derived from SPICE simulation. The bipartite subgraph problem is solved by using the proposed circuit. The SPICE simulation result confirms the function of the network. Because the complexity of the proposed analog circuit is so small, it is possible to fabricate an optimization system in a single chip.&lt;/p&gt;

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Books

  • IAENG Transactions on Engineering Sciences - Special Issue for the International Association of Engineers Conferences 2016 (Volume II)

    Sio-long Ao, Len Gelman, Haeng Kon Kim, Mahyar A Amouzegar( Role: Contributor)

    World Scientific Publishing  2018.1 

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  • ICTプロフェッショナル概論

    岡山大学出版会  2013 

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  • グラフ理論の基礎と応用

    共立出版  2012 

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  • Intelligent control and innovative computing

    Springer  2012 

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  • Wireless Mesh Networks

    InTech - Open Access Publisher  2011 

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  • 情報セキュリティ対策の要点-実務と理論-

    コロナ社  2005 

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  • Soft computing in communications

    Springer  2004 

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MISC

  • A Proposal of Two Types of Exercise Problems for TCP/IP Programming Learning by C Language

    LU Xiqin, FUNABIKI Nobuo, NAING Inzali, HTOO SANDI KYAW Htoo, UEDA Kiyoshi

    電子情報通信学会技術研究報告(Web)   122 ( 406(NS2022 167-251) )   2023

  • An Overview of Edge Device Framework in SEMAR IoT Application Server Platform

    PANDUMAN Yohanes Yohanie Fridelin, FUNABIKI Nobuo, HUSNA Radhiatul, SHWE San Hay Mar, SUKARIDHOTO Sritrusta, KAO Wen-Chung

    電子情報通信学会大会講演論文集(CD-ROM)   2023   2023

  • An investigation of IEEE802.11ax protocol usage to holding access-point assignment algorithm in wireless local-area networks

    田島滋人, 舩曵信生

    電子情報通信学会技術研究報告(Web)   122 ( 406(NS2022 167-251) )   2023

  • A Throughput Drop Estimation Model with Non-Channel Bonding for Two-Link Concurrent Communications in IEEE 802.11ac WLAN

    ROY Sujan Chandra, FUNABIKI Nobuo, WU Bin, SUN Yuanshuai, HTET Ei Ei, KURIBAYASHI Minoru

    電子情報通信学会大会講演論文集(CD-ROM)   2023   2023

  • An Extension of Answer Interface File Generator for Node.js-based Java Programming Learning Assistant System Platform

    AUNG Soe Thandar, FUNABIKI Nobuo, WAI Khaing Hsu, LU Xiqin, JING Yanhui

    電子情報通信学会大会講演論文集(CD-ROM)   2023   2023

  • Experimental Verification of Interface Setup Optimization Method Using Throughput Estimation Model for Concurrently Communicating Three Access-Points in Wireless Local-Area Network

    AKHTER Fatema, FUNABIKI Nobuo, HTET Ei Ei, KURIBAYASHI Minoru

    電子情報通信学会大会講演論文集(CD-ROM)   2023   2023

  • An Extension of Static Worker Assignment Algorithm to Uniform Jobs with Multiple CPU Time in User-PC Computing System

    ZHOU Xudong, FUNABIKI Nobuo, AUNG Lynn Htet, XU Xiang

    電子情報通信学会大会講演論文集(CD-ROM)   2023   2023

  • A Proposal for Flowchart Understanding Problem (FUP) for System Design Learning

    MON Khin Thet, FUNABIKI Nobuo, WAI Khaing Hsu, AUNG Soe Thandar

    電子情報通信学会大会講演論文集(CD-ROM)   2023   2023

  • Design and Implementation of Unit Testing Tool in Client-Side Web Programming Learning System

    NAING Inzali, FUNABIKI Nobuo, WAI Khaing Hsu, HTOO SANDI KYAW Htoo, QI Huiyu, FLASMA Veronicha

    電子情報通信学会技術研究報告(Web)   122 ( 406(NS2022 167-251) )   2023

  • An Extension of User-PC Computing System for NS-3 Network Simulations

    HTET AUNG Lynn, FUNABIKI Nobuo, KURIBAYASHI Minoru, GUNJI Haruki, KOKUBUN Yuto, UEDA Kiyoshi

    電子情報通信学会技術研究報告(Web)   122 ( 406(NS2022 167-251) )   2023

  • A Study of Grammar-concept Understanding Problem for Web Application Development using MEAN Architecture

    KYAW Htoo Htoo Sandi, KANEKO Keiichi, AUNG Soe Thandar, NAING Inzali, FUNABIKI Nobuo

    電子情報通信学会技術研究報告(Web)   122 ( 406(NS2022 167-251) )   2023

  • Efficient Execution of Wireless Multi-hop Network Simulation by User-PC Computing System using Docker

    郡司遥輝, 舩曵信生, HTET Hein, AUNG Lynn Htet, 三好匠, 山崎託, 山本嶺, 上田清志

    電子情報通信学会技術研究報告(Web)   122 ( 406(NS2022 167-251) )   2023

  • A Study of Automatic Test Data Generation Method for C Programming

    LI Zhikang, FUNABIKI Nobuo, LU Xiqin, QI Huiyu

    電子情報通信学会大会講演論文集(CD-ROM)   2023   2023

  • Prediction of Room Temperature and Airflow Distribution in Air Conditioning Guidance Systems

    ZHAO Yihan, 小島一恭, 佐藤博之, HUO Yuanzhi, 舩曵信生

    日本機械学会年次大会講演論文集(CD-ROM)   2022   2022

  • A Feasibility Study of Interface Setup Optimization Method Using Throughput Estimation Model for Concurrently Communicating Three Access-Points in Wireless Local-Area Network

    AKHTER Fatema, FUNABIKI Nobuo, WU Bin, MARIO GULO Melki, CHANDRA ROY Sujan, KURIBAYASHI Minoru

    電子情報通信学会技術研究報告(Web)   122 ( 310(NS2022 128-149) )   2022

  • Two Extensions of Indoor Localization System Using IEEE802.15.4 for Detection Accuracy Improvement

    濱崎和志, HUO Yuanzhi, PUSPITANINGAYU Pradini, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告(Web)   122 ( 310(NS2022 128-149) )   2022

  • A Study on Convergency of DNN Watermarking Without Embedding Loss Function

    聴覚研究会資料 = Proceedings of the auditory research meeting   51 ( 7 )   393 - 398   2021.11

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  • A study of fingerprint parameter optimization method for indoor localization system using IEEE802.15.4 devices

    Yuanzhi Huo, Pradini Puspitaningayu, Kazushi Hamazaki, Nobuo Funabiki, Minoru Kuribayashi, Kazuyuki Kojima

    電子情報通信学会技術研究報告   LOIS2021-4   19 - 24   2021.5

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  • A Study of Face Detection and Its Privacy Protection in Photos Taken by Wide-Angle Surveillance Camera

    中井康貴, 栗林稔, 舩曳信生, 藤井爽平, 石原洋之

    電子情報通信学会技術研究報告(Web)   120 ( 418(EMM2020 67-79) )   2021

  • Extensions of Answer Analysis Function for Programming Learning Assistant System

    西村一輝, 岩本晃司郎, HTOO SANDI KYAW Htoo, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告(Web)   121 ( 12(LOIS2021 1-11) )   2021

  • An Extension of Indoor Localization System Using IEEE802.15.4 Protocol for Multiple Users

    濱崎和志, PUSPITANINGAYU Pradini, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告(Web)   121 ( 12(LOIS2021 1-11) )   2021

  • An Implementation of Ventilation Request Function in Air-Conditioning Guidance System

    坂上暢規, HUO Yuanzhi, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告(Web)   121 ( 12(LOIS2021 1-11) )   2021

  • A Study on Feature Extraction Suitable for Double JPEG Compression Analysis Based on Statistical Bias Observation of DCT Coefficients

    竹下大地, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告(Web)   121 ( 28(IT2021 1-14) )   2021

  • A Study of Detecting Adversarial Examples Using Sensitivities to Multiple Auto Encoders

    山崎裕真, 栗林稔, 舩曵信生, NGUYEN Huy HONG, 越前功

    電子情報通信学会技術研究報告(Web)   121 ( 28(IT2021 1-14) )   2021

  • Detection of Adversarial Examples in CNN Image Classifiers Using Features Extracted with Multiple Strengths of Filter

    東亮憲, 栗林稔, 舩曵信生, NGUYEN Huy Hong, 越前功

    電子情報通信学会技術研究報告(Web)   120 ( 418(EMM2020 67-79) )   2021

  • Poster Presentation : Evaluation on JPEG Image Compression History Analysis Using Histogram of DCT Coefficients with Different Block Size

    聴覚研究会資料 = Proceedings of the auditory research meeting   50 ( 6 )   337 - 342   2020.11

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  • DM-QIM Watermarking for Fully Connected Layers of DNN Model

    映像情報メディア学会技術報告 = ITE technical report   44 ( 18 )   21 - 26   2020.9

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  • A Database-less Implementation for Portable Server of Java Programming Learning Assistant System

    岩本晃司郎, 舩曵信生, 石原信也, 栗林稔

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   71st   2020

  • DM-QIM Watermarking for Weights of Deep Neural Network

    田中拓朗, 安井達哉, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告   119 ( 463(EMM2019 102-129)(Web) )   2020

  • Study of CNN-based Analysis on Editing History of JPEG File Using Histogram of DCT Coefficients

    小浦啓太郎, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告   119 ( 463(EMM2019 102-129)(Web) )   2020

  • Detection of Illegal Movies Captured by Video Camera from Display Device

    鎌苅康大, 河田健斗, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告   119 ( 463(EMM2019 102-129)(Web) )   2020

  • A proposal of individual input data extraction method in Word document file

    LI Yuehao, 舩曵信生, 栗林稔, 石原信也

    電子情報通信学会技術研究報告   119 ( 468(ET2019 76-105)(Web) )   2020

  • DM-QIM Watermarking for Fully Connected Layers of DNN Model

    田中拓朗, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告(Web)   120 ( 151(EMM2020 29-35) )   2020

  • Detecting Adversarial Examples Based on Sensitivities to Lossy Compression Algorithms

    東亮憲, 栗林稔, 舩曵信生, NGUYEN Huy Hong, 越前功

    電子情報通信学会技術研究報告   119 ( 463(EMM2019 102-129)(Web) )   2020

  • Evaluation on JPEG Image Compression History Analysis Using Histogram of DCT Coefficients with Different Block Size

    中嶋直也, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告(Web)   120 ( 241(EA2020 21-45) )   2020

  • An Improvement of Air-Conditioning Guidance System with Outdoor Discomfort Index for Avoiding False Messages

    HUDA Samsul, FUNABIKI Nobuo, KURIBAYASHI Minoru, WIDYATRA SUDIBYO Rahardhita, ISHIHARA Nobuya

    電子情報通信学会技術研究報告(Web)   120 ( 69(NS2020 22-30) )   2020

  • A Calligraphy Learning Assistant System with Letter Portion Practice Function Using Projection Mapping

    Huda Samsul, Funabiki Nobuo, Kuribayashi Minoru, Kao Wen-Chung

    IEEE Conference Proceedings   2020 ( ICCE )   2020

  • A Proposal of Air Conditioner Overuse Alarm System Using Raspberry Pi

    HUDA Samsul, FUNABIKI Nobuo, KURIBAYASHI Minoru, SUDIBYO Rahardhita Widyatra, ISHIHARA Nobuya

    電子情報通信学会大会講演論文集(CD-ROM)   2020   2020

  • Extraction of Characteristic Vectors and Its Dimension Reduction for Estimating Collusion Strategy in Fingerprinting Codes

    コンピュータセキュリティシンポジウム2019論文集   ( 2019 )   982 - 989   2019.10

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  • Detecting Adversarial Example Based on Changes of CNN Classification Results Caused by JPEG Compression

    コンピュータセキュリティシンポジウム2019論文集   ( 2019 )   975 - 981   2019.10

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  • Analysis on Editing History of JPEG File Based on the Bias in Histogram of DCT Coefficients

    コンピュータセキュリティシンポジウム2019論文集   ( 2019 )   969 - 974   2019.10

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  • Three Improvements of Code Correction Problem in Java Programming Learning Assistant System

    情報処理学会論文誌プログラミング(PRO)   12 ( 3 )   17 - 17   2019.7

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    本グループでは,Javaプログラミング教育の高度化を狙いとして,Webを用いたJavaプログラミング学習支援システムJPLASを開発している.JPLASでは,学習者の作成した解答コードに対し,テストコードを用いたソフトウェアテストによる自動採点を行っている.その際,学習者は,テストコード中の情報(クラス,メソッド,変数の名称,アクセス修飾子,データ型など)を読み取り,解答コードに反映する必要がある.そのため,テストコードと誤りのある問題コードを与え,後者の修正を求める,コード修正問題を提案している.また,問題コード生成のために,ソースコードに誤りを施すアルゴリズムを提案している.本研究では,コード修正問題において,1)問題コードの多様化のための誤り情報の追加,2)テストコードを用いた問題コードの検証による正当性検証,3)問題コードの難易度の制御機能,の3つの改良を提案する.それらをJPLASに実装し,本学科Javaプログラミング授業での利用により,本提案の有効性を検証する.
    To enhance Java programming educations, we have developed the Web-based Java Programming Learning Assistant System (JPLAS). JPLAS automatically marks the answer code of a student through software test using the test code. Thus, a student has to extract the necessary information from the test code to implement the answer code. To help a novice student, we proposed the code correction problem in the previous study, where a source code with errors, called a problem code, is given to a student with a test code, and is requested to be corrected to pass the test. We also proposed the algorithm to generate the problem code by making errors in the source code. In this study, we propose three improvements in the code correction problem: 1) to allow additional code items for errors for variation of the problem code, 2) to verify the correctness of the problem code by testing it, and 3) to implement the problem difficulty control function. We verify the effectiveness through applications in the Java programing course in our department.

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  • Implementations of Answering Status Visualization and Problem Recommendation Functions in Java Programming Learning Assistant System

    情報処理学会論文誌プログラミング(PRO)   12 ( 3 )   16 - 16   2019.7

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    Javaは,可搬性,堅牢性,安全性に優れたプログラミング言語として,業務系システム,組み込みシステムなどに幅広く利用されており,そのプログラミング教育が重要である.そこで本研究室では,Webを用いたJavaプログラミング学習支援システムJPLAS(Java Programming Learning Assistant System)を開発し,授業での運用を行っている.現状のJPLASでは,教員がそれぞれの学生の問題解答状況を一覧で把握するための機能を有していない.また,全学生に同一の問題が出されており,個々の学生の学習レベルに適した問題が出題されていない.本発表では,以上の課題を解決するために,JPLASにおいて,エレメント補充問題を対象として,学生の解答状況の可視化機能,および,各学生に次に解くべき問題の推薦機能を実装する.特に後者では,これまでの学生の解答結果の分析により,各問題の難易度の算出法を提案し,各学生の解答履歴から,その学生に適した難易度の問題を次に解くべき問題として推薦する.評価として,教員に対して,解答状況可視化機能を用いたプログラミング演習を行ってもらう.また,学生に対して,問題推薦機能を用いた問題演習を行ってもらう.その後,アンケートの実施および解答結果の分析を行い,有効性を検証する.今後の課題として,問題難易度設定方法の再検討,エレメント補充問題以外の問題も対応可能な問題推薦機能への拡張があげられる.
    As a portable, solid, secure programming language, Java is used widely such as business system and embedded system, thus its programming education is important. Therefore, we have developed the Web-based Java Programming Learning Assistant System (JPLAS) and used it in the Java programming course. JPLAS has no function which teacher can follow answering status of problems for each student. Additionally, it set the same problems to all of students, thus, it doesn't set the suitable problems corresponding to learning level for each student. In this presentation, we implement the answering status visualization function for each student and the recommendation function which recommend problems each student should solve the next for element fill in blank problems in JPLAS. In particular in the latter one, according to analysis of students' answering results so far, we propose the calculation method of problem difficulty and the system recommend the suitable problem to solve the next with learning level and answering history of each student. As an evaluation, we apply the answering status visualization function to the teacher in the programming exercise. Furthermore, we inspect the effectiveness by conducting a questionnaire survey and analyzing the answering results after students solve some of problems using problem recommendation function. In the future works, revision of the way to set up the problem level of difficulty and extension of problem recommendation function to follow other type of problems are some important tips.

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  • Cyclically Permutable codeとLDPC符号における同期回復と誤り訂正能力の比較

    須磨尚大, 栗林稔, 舩曵信生

    情報理論とその応用シンポジウム予稿集(CD-ROM)   42nd   2019

  • Estimation of Collusion Strategy for Fingerprinting Codes under Noisy Environment

    安井達哉, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告   118 ( 494(EMM2018 91-115)(Web) )   2019

  • A Study of Patch Size for Distinguishing CGs from Real Photos Using CNN

    河田健斗, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告   118 ( 494(EMM2018 91-115)(Web) )   2019

  • An Evaluation of Calligraphy Learning Assistant System Using Projection Mapping

    HUDA Samsul, FUNABIKI Nobuo, KURIBAYASHI Minoru, KYAW Htoo Htoo Sandi

    電子情報通信学会大会講演論文集(CD-ROM)   2019   2019

  • An Implementation of Letter Portion Practice Function in Calligraphy Learning Assistant System Using Projection Mapping

    HUDA Samsul, FUNABIKI Nobuo, KURIBAYASHI Minoru

    情報科学技術フォーラム講演論文集   18th   2019

  • Implementation and Evaluation of Fingerprinting System for Preventing Internal Leakage of Sensitive Data

    聴覚研究会資料 = Proceedings of the auditory research meeting   48 ( 7 )   661 - 666   2018.11

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  • Segment-Wise Watermarking Scheme for PDF Document File Considering The Applicability to Fingerprinting System

    聴覚研究会資料 = Proceedings of the auditory research meeting   48 ( 7 )   655 - 660   2018.11

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  • Dynamic Estimation of Collusion Strategy for the Detection of Colluders in Fingerprinting Codes

    安井 達哉, 栗林 稔, 舩曵 信生, 越前 功

    映像情報メディア学会技術報告 = ITE technical report   42 ( 31 )   65 - 70   2018.9

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  • A Study on Synchronization and Error Correction for Cyclically Permutable Code

    須磨尚大, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告   118 ( 31(IT2018 1-11) )   13 - 18   2018.5

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  • A Study of Aesthetic QR Code Considering Local Characteristic of Image

    栗林稔, 村上元貴, 舩曵信生

    電子情報通信学会技術研究報告   118 ( 31(IT2018 1-11) )   19 - 24   2018.5

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  • Estimation of Collusion Strategy for Fingerprinting Codes

    安井達哉, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告   117 ( 476(EMM2017 77-93) )   17 - 22   2018.3

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  • Analysis on History of JPEG Compression Considering the Characteristic of Quantization Table

    小浦啓太郎, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告   117 ( 476(EMM2017 77-93) )   45 - 50   2018.3

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  • A Study of Tracing Algorithm for Fingerprinting Code Considering Erasure Symbols (マルチメディア情報ハイディング・エンリッチメント)

    栗林 稔, 舩曵 信生

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117 ( 425 )   13 - 18   2018.1

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  • An Extension of Test Code Generation Support Tool Using Test Log to Java Method with Returning Value

    日下 涼太, 舩曵 信生, 栗林 稔, 石原 信也

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117 ( 381 )   127 - 132   2018.1

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  • An Introduction of Source Code Management System for Java Programming Learning Assistant System : JPLAS

    松本 慎平, 舩曵 信生, 栗林 稔, 石原 信也

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117 ( 380 )   167 - 172   2018.1

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  • A Proposal of Code Correction Problem for Test Code Study in Java Programming Learning Assistant System

    何 賽, 舩曵 信生, 栗林 稔, 石原 信也

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117 ( 381 )   161 - 166   2018.1

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  • A test code generation method for coding standard input/output with exception handling in Java programming learning assistant system

    Ei Ei Mon, Nobuo Funabiki, Ryota Kusaka, Khin Khin Zaw, Wen-Chung Kao

    Advances in Science, Technology and Engineering Systems Journal   3 ( 1 )   30 - 37   2018

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  • A proposal of code completion problem for Java programming learning assistant system

    Htoo Htoo, Sandi Kyaw, Shwe Thinzar Aung, Hnin Aye Thant, Nobuo Funabiki

    Proceeding of The 10th International Workshop on Virtual Environment and Network-Oriented Applications (VENOA-2018)   855 - 864   2018

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  • A proposal of hardware channel bonding for IEEE802.11n wireless network using Raspberry Pi

    Rahardhita Widyatra Sudibyo, Nobuo Funabiki, Wen-Chung Kao

    Proceeding of 2018 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW 2018)   277 - 278   2018

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  • A study of MIMO host location optimization in active access-point configuration algorithm for elastic WLAN system

    Mousumi Saha, Nobuo Funabiki, Sumon Kumar Debnath, Wen-Chung Kao

    Proceeding of 2018 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW 2018)   275 - 276   2018

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  • A throughput estimation model for IEEE 802.11n MIMO link in wireless local-area networks

    Sumon Kumar Debnath, Mousumi Saha, Nobuo Funabiki, Wen-Chung Kao

    Proceedings of 3rd International Conference on Computer and Communication Systems (ICCCS-2018)   327 - 331   2018

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  • A holding access-point assignment algorithm for IEEE802.11 wireless local-area networks

    Shigeto Tajima, Nobuo Funabiki, Teruo Higashino

    International Journal of Space-Based and Situated Computing   8 ( 1 )   50 - 58   2018

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  • An improved informative test code approach for code writing problem in Java programming learning assistant system

    Nobuo Funabiki, Khin Khin Zaw, Ei Ei Mon, Wen-Chung Kao

    Proceeding of The 6th International Conference on Emerging Internet, Data and Web Technologies (EIDWT-2018)   687 - 698   2018

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  • Implementation and Evaluation of Fingerprinting System for Preventing Internal Leakage of Sensitive Data

    上田貴大, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告   118 ( 312(EA2018 63-80) )   2018

  • Segment-Wise Watermarking Scheme for PDF Document File Considering The Applicability to Fingerprinting System

    福島拓哉, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告   118 ( 312(EA2018 63-80) )   2018

  • Dynamic Estimation of Collusion Strategy for the Detection of Colluders in Fingerprinting Codes

    安井達哉, 栗林稔, 舩曵信生, 越前功

    電子情報通信学会技術研究報告   118 ( 223(IE2018 30-43)(Web) )   2018

  • File access extension of test code generation tool for Java programming learning assistant system

    Nobuo Funabiki, Ryota Kusaka, Nobuya Ishihara, Wen-Chung Kao

    2017 IEEE 6th Global Conference on Consumer Electronics, GCCE 2017   2017-   1 - 2   2017.12

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    To advance Java programming studies, we have developed the Java Programming Learning Assistant System (JPLAS). The test code plays a critical role in verifying the correctness of the source code from a student automatically at the server in the code writing problem in JPLAS. Previously, we proposed the test code generation tool that automatically generates the test code from the given source code containing standard inputs/outputs that novice students are expected to study in advance. In this paper, we extend this tool to handle the source code with file inputs/outputs. By applying the extended tool to three codes containing file inputs/outputs, the correctness of the generated test codes is confirmed.

    DOI: 10.1109/GCCE.2017.8229400

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  • A holding access-point assignment algorithm for wireless local-area networks

    Shigeto Tajima, Nobuo Funabiki, Sumon Kumar Debnath, Teruo Higashino

    2017 9th IEEE International Conference on Communication Software and Networks, ICCSN 2017   2017-   367 - 371   2017.12

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    Nowadays, various types of access-points (APs) and hosts such as dedicated APs, laptop personal computers, and mobile terminals have been used in IEEE802.11 wireless local-area networks (WLANs). As a result, the optimal assignment of holding APs into the network field depending on the host type distribution has become very important to improve the network performance. In this paper, we formulate this holding access-point assignment problem as a combinatorial optimization problem and propose its heuristic algorithm. Because plural non-overlapping channels are available in IEEE802.11 WLANs, we extend the algorithm to finding the channel assignment to the APs such that the total interference among them is minimized. The effectiveness of our proposal is verified through simulations in three instances.

    DOI: 10.1109/ICCSN.2017.8230137

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  • Accumulator for monotone formulas and its application to anonymous credential system

    Shahidatul Sadiah, Toru Nakanishi, Nasima Begum, Nobuo Funabiki

    Journal of Information Processing   25   949 - 961   2017.12

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    An anonymous credential system allows a user to convince a service provider anonymously that he/she owns certified attributes. Previously, a system to prove AND and OR relations simultaneously by CNF formulas was proposed. To achieve a constant-size proof of the formula, this system adopts an accumulator that compresses multiple attributes into a single value. However, this system has a problem: the proof generation requires a large amount of computational time in the case of lots of OR literals in the formula. Therefore, we convert the attribute relation from the CNF formula to a monotone formula to decrease the number of OR literals. The monotone formula is a logic formula that contains any combination of AND and OR relations. In this paper, we propose an extended accumulator to prove the monotone formula, and apply it to the anonymous credential system. Our approach to prove the monotone formula is that the tag assignment in the accumulator is extended to be adapted to the tree expressing the monotone formula. Using this type of formula, the number of public parameters multiplied in the accumulator is decreased, which greatly impacts the reduction of authentication time.

    DOI: 10.2197/ipsjjip.25.949

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  • A Study of Throughput Estimation Model and Channel Assignment Algorithm for Partially Overlapping Channels in IEEE 802.11n Wireless Local-Area Networks (ネットワークシステム)

    イスマエル・ムネネ クエンガ, 舩曵 信生, セリム・アル・マムン ムハマド, ソウ・ルイン キョウ, クマル・デブナ シュモン

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117 ( 303 )   23 - 28   2017.11

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  • A Study of Throughput Estimation Model for IEEE 802.11n MIMO Link in Wireless Local-Area Network (ネットワークシステム) Reviewed

    クマル・デブナ シュモン, 舩曵 信生, ソウ・ルイン キョウ, セリム・アル・マムン ムハマド

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117 ( 303 )   17 - 22   2017.11

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  • A Study of DCT-OFDM-Based Watermarking Scheme Assisted by Error Correcting Code

    重本章吾, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告   117 ( 282(EMM2017 55-65) )   47 - 52   2017.11

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  • A study of obfuscation for the security enhancement of watermarking schemes

    山下晃一郎, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告   117 ( 282(EMM2017 55-65) )   53 - 58   2017.11

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  • Making of Code Clone Elimination Problem Function for Java Programming Learning Assistant System

    石原 信也, 舩曵 信生, 栗林 稔

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117 ( 249 )   25 - 30   2017.10

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  • An Informative Test Code Approach for Code Writing Problem in Java Programming Learning Assistant System (ソフトウェアサイエンス)

    キン ゾウ キン, 舩曵 信生

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117 ( 248 )   31 - 36   2017.10

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  • An Informative Test Code Approach for Code Writing Problem in Java Programming Learning Assistant System (ディペンダブルコンピューティング)

    キン ゾウ キン, 舩曵 信生

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117 ( 249 )   31 - 36   2017.10

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  • A software architecture for Java programming learning assistant system

    Ishihara Nobuya, Funabiki Nobuo, Kuribayashi Minoru, Kao Wen-Chung

    International Journal of Computer & Software Engineering   2 ( 1 )   116 - 116   2017.7

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    For advancements of Java programming educations, we have developed a Web-based Java Programming Learning System (JPLAS). JPLAS provides four problems with different levels, namely, element fill-inblank problem, value trace problem, statement fill-in-blank problem, and code writing problem, to cover students at different learning stages. Unfortunately, since JPLAS has been implemented by a number of students who studied in our group at different years, the code has become complex and redundant, which makes further extensions of JPLAS extremely hard. In this paper, we propose a software architecture for JPLAS to avoid redundancy. Based on the MVC model, our proposal uses Java for the model (M), HTML/CSS/JavaScript for the view (V), and JSP for the controller (C). Besides, adopting a design pattern, the marking functions of the four problems are implemented uniformly. For evaluations, after JPLAS is implemented with this architecture, the number of code files is compared with that of the previous implementation, and the number of additional files is examined for two new functions.

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  • An offline answering function for code writing problem in Java Programming Learning Assistant System

    Nobuo Funabiki, Yingxin Wang, Nobuya Ishihara, Wen-Chung Kao

    2017 IEEE International Conference on Consumer Electronics - Taiwan, ICCE-TW 2017   241 - 242   2017.7

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    In order to promote Java programming educations, the Web-based Java Programming Learning Assistant System (JPLAS) has been implemented. JPLAS provides the code writing problem, where students write Java codes that satisfy the given specifications and submit them to the JPLAS server to obtain the marks using test codes instantly. Unfortunately, JPLAS could be accessed simply when the Internet connections are available. In this study, we perform the offline answering function for the code writing problem for use of JPLAS even in places without the Internet connections. First, the teacher downloads the assignment files from the server and delivers them to the students using USB memories. Next, students solve the assignments on Eclipse including code writing and testing, then submit the results to the teacher. Finally, the teacher uploads the results to the server. To evaluate the proposed function, the questionnaire will be collected after giving five assignments to six students in our group.

    DOI: 10.1109/ICCE-China.2017.7991085

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  • Watermarking Scheme with Large Capacity Considering the Internal Structure of PDF File

    福島拓哉, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告   117 ( 39(IT2017 1-15) )   13 - 18   2017.5

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  • A Proposal of Fingerprinting System for Protection of Sensitive Data from Internal Leakage

    上田貴大, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告   117 ( 39(IT2017 1-15) )   19 - 24   2017.5

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  • DCT-OFDM Watermarking Scheme Based on Communication System Model

    Minoru Kuribayashi, Shogo Shigemoto, Nobuo Funabiki

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E100A ( 4 )   944 - 952   2017.4

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    In conventional spread spectrum (SS) watermarking schemes, random sequences are used for the modulation of watermark information. However, because of the mutual interference among those sequences, it requires complicated removal operation to improve the performance. In this paper, we propose an efficient spread spectrum watermarking scheme by introducing the orthogonal frequency divisiion multiplexing (OFDM) technique at the modulation of watermark information. The SS sequences in the proposed method are the DCT basic vectors modulated by a pseudo-random number (PN) sequence. We investigate the SS-based method considering the host interference at the blind detection scenario and analyze the noise caused by attacks. Because every operation is invertible, the quantization index modulation (QIM)-based method is applicable for the OFDM modulated signals. We also consider the property of watermark extracting operation in SS-based and QIM-based method and formalize their models of noisy channel in order to employ an error correcting code. The performance of their methods with error correcting code is numerically evaluated under the constraints of same distortion level in watermarked content. The experimental results indicated a criteria for the selection of SS-based and QIM-based methods for given content, which is determined by the amount of host interference. In case that the host interference is 0.8 times smaller than a watermark signal, the SS-based method is suitable. When it is 1.0 times larger, the QIM-based method should be selected.

    DOI: 10.1587/transfun.E100.A.944

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  • A Consideration of Partial Channel Interference in Channel Assignment for Holding Access-Point Assignment Problem in Wireless Local-Area Networks

    116 ( 484 )   457 - 462   2017.3

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  • Cross-layer selective routing for cost and delay minimization in IEEE 802.11ac wireless mesh network

    I. W. Lai, Nobuo Funabiki, Shigeto Tajima, Md. Selim Al Mamun, Sho Fujita

    Wireless Networks   1 - 13   2017.2

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    A Wireless Internet-access Mesh NETwork (WIMNET) provides scalable and reliable internet access through the deployment of multiple access points (APs) and gateways (GWs). In this work, we propose a selective routing algorithm aiming at a hierarchical minimization of the operational cost and the maximal end-to-end delay. In particular, by deploying redundant APs/GWs in the network field, the WIMNET becomes robust to the link or AP/GW failure. However, these redundant APs/GWs increase the operational cost like the power consumption. By using Dijkstra algorithm and 2-opt algorithm, the proposed algorithm iteratively deactivates the deployed APs/GWs and performs the routing that reduces the maximal end-to-end delay based on the APs/GWs remaining active. The generated route meets the real-world constraints like fairness criterion. We further propose a cross-layer design to enhance the routing performance by exploiting the MAC-layer frame aggregation technique. The selective routing algorithm is then implemented in the WIMNET simulator proposed by our group. The numerical experiments demonstrate that in both indoor and open space environments, the proposed selective routing greatly reduces the operational cost, i.e., up to (Formula presented.) APs/GWs can be deactivated.

    DOI: 10.1007/s11276-017-1462-9

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  • Cross-layer selective routing for cost and delay minimization in IEEE 802.11ac wireless mesh network

    I. W. Lai, Nobuo Funabiki, Shigeto Tajima, Md. Selim Al Mamun, Sho Fujita

    Wireless Networks   1 - 13   2017.2

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    A Wireless Internet-access Mesh NETwork (WIMNET) provides scalable and reliable internet access through the deployment of multiple access points (APs) and gateways (GWs). In this work, we propose a selective routing algorithm aiming at a hierarchical minimization of the operational cost and the maximal end-to-end delay. In particular, by deploying redundant APs/GWs in the network field, the WIMNET becomes robust to the link or AP/GW failure. However, these redundant APs/GWs increase the operational cost like the power consumption. By using Dijkstra algorithm and 2-opt algorithm, the proposed algorithm iteratively deactivates the deployed APs/GWs and performs the routing that reduces the maximal end-to-end delay based on the APs/GWs remaining active. The generated route meets the real-world constraints like fairness criterion. We further propose a cross-layer design to enhance the routing performance by exploiting the MAC-layer frame aggregation technique. The selective routing algorithm is then implemented in the WIMNET simulator proposed by our group. The numerical experiments demonstrate that in both indoor and open space environments, the proposed selective routing greatly reduces the operational cost, i.e., up to (Formula presented.) APs/GWs can be deactivated.

    DOI: 10.1007/s11276-017-1462-9

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  • A Proposal of Code Clone Deletion Problem for Java Programming Learning Assistant System

    石原 信也, 舩曵 信生, 栗林 稔

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 425 )   47 - 52   2017.1

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  • An Improvement of Naming Rule Testing Tool for Java Programming Learning

    松本慎平, 舩曵信生, 栗林稔, 石原信也

    電子情報通信学会技術研究報告   116 ( 426(SS2016 36-59) )   41‐46   2017.1

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  • A fill-in-blank problem workbook for Java programming learning assistant system

    Ta Na, Nobuo Funabiki, Khin Khin Zaw, Nobuya Ishihara, Shinpei Matsumoto, Wen-Chung Kao

    International Journal of Web Information Systems   13 ( 2 )   140 - 154   2017

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    Purpose-To advance Java programming educations, the authors have developed a Java Programming Learning Assistant System (JPLAS) as a web application system. JPLAS provides fill-in-blank problems for novices to study the grammar and basic programming skills through code reading. Design/methodology/approach-To select the blank elements with grammatically correct and unique answers from a given Java code, the authors have proposed the graph-based blank element selection algorithm. Then, the code for this problem should be highly readable to encourage novice students to study it. Because code readability can be improved by proper names for identifiers, the authors have also proposed the naming rule testing algorithm to identify codes with correct names. Findings-In this paper, the authors present a fill-in-blank problem workbook by collecting suitable Java codes from textbooks and Web sites and applying these algorithms with several extensions. The workbook consists of 16 categories with a considerable number of problems that follow the conventional learning order of Java programming. Originality/value-The proper set of ready-made fill-in-blank problems is effective in enhancing the usability of JPLAS both for teachers and students. For the preliminary evaluation, the authors assign a few problems to students. In coming semesters, the authors will use this workbook in the course to verify the adequacy of the proposal for novices.

    DOI: 10.1108/IJWIS-12-2016-0076

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  • A Proposal of Software Architecture for Java Programming Learning Assistant System

    Nobuya Ishihara, Nobuo Funabiki, Minoru Kuribayashi, Wen-Chung Kao

    2017 IEEE 31ST INTERNATIONAL CONFERENCE ON ADVANCED INFORMATION NETWORKING AND APPLICATIONS (AINA)   2 ( 1 )   64 - 70   2017

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    To improve Java programming educations, we have developed a Web-based Java Programming Learning System (JPLAS). To deal with students at different levels, JPLAS provides three levels of problems, namely, element fill-in-blank problems, statement fill-in-blank problems, and code writing problems. Unfortunately, since JPLAS has been implemented by various students who studied in our group at different years, the code has become complex and redundant, which makes further extensions of JPLAS extremely hard. In this paper, we propose the software architecture for JPLAS to avoid redundancy to the utmost at implementations of new functions that will be continued with this JPLAS project. Following the MVC model, our proposal basically uses Java for the model (M), JavaScript/CSS for the view (V), and JSP for the controller (C). For the evaluation, we implement JPLAS by this architecture and compare the number of code files with the previous implementation.

    DOI: 10.1109/AINA.2017.56

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  • A parameter optimization tool and its application to throughput estimation model for wireless LAN

    Nobuo Funabiki, Chihiro Taniguchi, Kyaw Soe Lwin, Khin Khin Zaw, Wen-Chung Kao

    The 9th International Workshop on Virtual Environment and Network-Oriented Applications (VENOA-2017)   701 - 710   2017

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  • A Channel Assignment Extension of Active Access-Point Configuration Algorithm for Elastic WLAN System and Its Implementation Using Raspberry Pi

    Mamun Md. Selim Al, Funabiki Nobuo, Lwin Kyaw Soe, Islam Md. Ezharul, Kao Wen-Chung

    International Journal of Networking and Computing   7 ( 2 )   248 - 270   2017

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    Recently, Wireless Local-Area Network (WLAN) has become prevailing as it provides flexible Internet access to users with low cost through installation of several types of access points (APs) in the network. Previously, we proposed the active AP configuration algorithm for the elastic WLAN system using heterogeneous APs, which dynamically optimizes the configuration by activating or deactivating APs based on traffic demands. However, this algorithm assumes that any active AP may use a different channel from the other ones to avoid interferences, although the number of non-interfered channels in IEEE 802.11 protocols is limited. In this paper, we propose the extension of the AP configuration algorithm to consider the channel assignment to the active APs under this limitation. Besides, AP associations of the hosts are modified to improve the network performance by averaging loads among channels. The effectiveness of our proposal is evaluated using the WIMNET simulator in two topologies. Finally, the elastic WLAN system including this proposal is implemented using Raspberry Pi for the AP. The feasibility and performance of the implementation are verified through experiments using the testbed.

    DOI: 10.15803/ijnc.7.2_248

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  • A Minimax Approach for Access Point Setup Optimization in IEEE 802.11n Wireless Networks

    Lwin Kyaw Soe, Funabiki Nobuo, Taniguchi Chihiro, Zaw Khin Khin, Mamun Md. Selim Al, Kuribayashi Minoru, Kao Wen-Chung

    International Journal of Networking and Computing   7 ( 2 )   187 - 207   2017

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    Recently, an IEEE 802.11n access point (AP) prevailed over the wireless local area network (WLAN) due to the high-speed data transmission using the multiple input multiple output (MIMO) technology. Unfortunately, the signal propagation from the 802.11n AP is not uniform in the circumferential and height directions because of the multiple antennas for MIMO. As a result, the data transmission speed between the AP and a host could be significantly affected by their relative setup conditions. In this paper, we propose a minimax approach for optimizing the 802.11n AP setup condition in terms of the angles and the height in an indoor environment using throughput measurements. First, we detect a bottleneck host that receives the weakest signal from the AP in the field using the throughput estimation model. To explore optimal values of parameters for this model, we adopt the versatile parameter optimization tool. Then, we optimize the AP setup by changing the angles and the height while measuring throughput. For evaluations, we verify the accuracy of the model using measurement results and confirm the throughput improvements for hosts in the field by our approach.

    DOI: 10.15803/ijnc.7.2_187

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  • A fill-in-blank problem workbook for Java programming learning assistant system

    Ta Na, Nobuo Funabiki, Khin Khin Zaw, Nobuya Ishihara, Shinpei Matsumoto, Wen-Chung Kao

    International Journal of Web Information Systems   13 ( 2 )   140 - 154   2017

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    Purpose-To advance Java programming educations, the authors have developed a Java Programming Learning Assistant System (JPLAS) as a web application system. JPLAS provides fill-in-blank problems for novices to study the grammar and basic programming skills through code reading. Design/methodology/approach-To select the blank elements with grammatically correct and unique answers from a given Java code, the authors have proposed the graph-based blank element selection algorithm. Then, the code for this problem should be highly readable to encourage novice students to study it. Because code readability can be improved by proper names for identifiers, the authors have also proposed the naming rule testing algorithm to identify codes with correct names. Findings-In this paper, the authors present a fill-in-blank problem workbook by collecting suitable Java codes from textbooks and Web sites and applying these algorithms with several extensions. The workbook consists of 16 categories with a considerable number of problems that follow the conventional learning order of Java programming. Originality/value-The proper set of ready-made fill-in-blank problems is effective in enhancing the usability of JPLAS both for teachers and students. For the preliminary evaluation, the authors assign a few problems to students. In coming semesters, the authors will use this workbook in the course to verify the adequacy of the proposal for novices.

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  • A graph-based blank element selection algorithm for fill-in-blank problems in Java programming learning assistant system

    Nobuo Funabiki, Tana, Khin Khin Zaw, Nobuya Ishihara, Wen Chung Kao

    IAENG International Journal of Computer Science   44 ( 2 )   247 - 260   2017

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  • A User-PC computing system as ultralow-cost computation platform for small groups

    Nobuo Funabiki, Kyaw Soe Lwin, Yuuki Aoyagi, Minoru Kuribayashi, Wen-Chung Kao

    Application and Theory of Computer Technology   2 ( 3 )   10 - 24   2017

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  • A Proposal of Software Architecture for Java Programming Learning Assistant System

    Nobuya Ishihara, Nobuo Funabiki, Minoru Kuribayashi, Wen-Chung Kao

    2017 IEEE 31ST INTERNATIONAL CONFERENCE ON ADVANCED INFORMATION NETWORKING AND APPLICATIONS (AINA)   64 - 70   2017

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    To improve Java programming educations, we have developed a Web-based Java Programming Learning System (JPLAS). To deal with students at different levels, JPLAS provides three levels of problems, namely, element fill-in-blank problems, statement fill-in-blank problems, and code writing problems. Unfortunately, since JPLAS has been implemented by various students who studied in our group at different years, the code has become complex and redundant, which makes further extensions of JPLAS extremely hard. In this paper, we propose the software architecture for JPLAS to avoid redundancy to the utmost at implementations of new functions that will be continued with this JPLAS project. Following the MVC model, our proposal basically uses Java for the model (M), JavaScript/CSS for the view (V), and JSP for the controller (C). For the evaluation, we implement JPLAS by this architecture and compare the number of code files with the previous implementation.

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  • A Proposal of Test Code Generation Tool for Java Programming Learning Assistant System

    Nobuo Funabiki, Ryota Kusaka, Nobuya Ishihara, Wen-Chung Kao

    2017 IEEE 31ST INTERNATIONAL CONFERENCE ON ADVANCED INFORMATION NETWORKING AND APPLICATIONS (AINA)   51 - 56   2017

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    To advance Java programming educations, we have developed the Java programming learning assistant system (JPLAS) that can verify the correctness of the code from a student automatically using the test-driven development (TDD) method. Then, to register a new assignment in JPLAS, teachers are required to write the test code in addition to the reference source code. Unfortunately, most teachers at schools are not accustomed to writing test codes. In this paper, we propose a test code generation tool that automatically generates the test cases from the reference source code by extracting the outputs for given inputs using functions in JUnit. As assignments for Java novice students, the code that contains standard inputs/outputs is emphasized. For evaluation, we collected 97 codes containing standard inputs/outputs from Java programming text books or Web sites. The experimental result has shown that the proposed tool correctly generated the test codes for them except for one code using a random generator.

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  • A graph-based blank element selection algorithm for fill-in-blank problems in Java programming learning assistant system

    Nobuo Funabiki, Tana, Khin Khin Zaw, Nobuya Ishihara, Wen-Chung Kao

    International Journal of Computer Science   44 ( 2 )   247 - 260   2017

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  • An element fill-in-blank problem application in UTYCC for Java programming learning assistant system

    Htoo Htoo, Sandi Kyaw, Shwe Thinzar Aung, Hnin Aye Thant, Nobuo Funabiki

    Proceedings of The 8th International Conference on Science and Engineering 2017 (ICSE 2017)   271 - 275   2017

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  • A proposal of informative test code approach for code writing problem in Java programming learning assistant system

    Khin Khin Zaw, Nobuo Funabiki, Wen-Chung Kao

    Proceedings of The 8th International Conference on Science and Engineering 2017 (ICSE 2017)   260 - 265   2017

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  • A design-aware test code approach for code writing problem in Java programming learning assistant system

    Khin Khin Zaw, Nobuo Funabiki

    International Journal of Space-Based and Situated Computing   7 ( 3 )   145 - 154   2017

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  • Dynamic access-point configuration approach for elastic wireless local-area network system

    Md. Manowarul Islam, Md. Selim Al Mamun, Nobuo Funabiki, Minoru Kuribayashi

    Proceedings of The Fifth International Symposium on Computing and Networking (CANDAR, ASON))   2017

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    DOI: 10.1109/CANDAR.2017.20

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  • A Minimax Approach for Access Point Setup Optimization in IEEE 802.11n Wireless Networks

    Lwin Kyaw Soe, Funabiki Nobuo, Taniguchi Chihiro, Zaw Khin Khin, Mamun Md. Selim Al, Kuribayashi Minoru, Kao Wen-Chung

    International Journal of Networking and Computing   7 ( 2 )   187 - 207   2017

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    Recently, an IEEE 802.11n access point (AP) prevailed over the wireless local area network (WLAN) due to the high-speed data transmission using the multiple input multiple output (MIMO) technology. Unfortunately, the signal propagation from the 802.11n AP is not uniform in the circumferential and height directions because of the multiple antennas for MIMO. As a result, the data transmission speed between the AP and a host could be significantly affected by their relative setup conditions. In this paper, we propose a minimax approach for optimizing the 802.11n AP setup condition in terms of the angles and the height in an indoor environment using throughput measurements. First, we detect a bottleneck host that receives the weakest signal from the AP in the field using the throughput estimation model. To explore optimal values of parameters for this model, we adopt the versatile parameter optimization tool. Then, we optimize the AP setup by changing the angles and the height while measuring throughput. For evaluations, we verify the accuracy of the model using measurement results and confirm the throughput improvements for hosts in the field by our approach.

    DOI: 10.15803/ijnc.7.2_187

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  • A Channel Assignment Extension of Active Access-Point Configuration Algorithm for Elastic WLAN System and Its Implementation Using Raspberry Pi

    Mamun Md. Selim Al, Funabiki Nobuo, Lwin Kyaw Soe, Islam Md. Ezharul, Kao Wen-Chung

    International Journal of Networking and Computing   7 ( 2 )   248 - 270   2017

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    Recently, Wireless Local-Area Network (WLAN) has become prevailing as it provides flexible Internet access to users with low cost through installation of several types of access points (APs) in the network. Previously, we proposed the active AP configuration algorithm for the elastic WLAN system using heterogeneous APs, which dynamically optimizes the configuration by activating or deactivating APs based on traffic demands. However, this algorithm assumes that any active AP may use a different channel from the other ones to avoid interferences, although the number of non-interfered channels in IEEE 802.11 protocols is limited. In this paper, we propose the extension of the AP configuration algorithm to consider the channel assignment to the active APs under this limitation. Besides, AP associations of the hosts are modified to improve the network performance by averaging loads among channels. The effectiveness of our proposal is evaluated using the WIMNET simulator in two topologies. Finally, the elastic WLAN system including this proposal is implemented using Raspberry Pi for the AP. The feasibility and performance of the implementation are verified through experiments using the testbed.

    DOI: 10.15803/ijnc.7.2_248

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  • Javaプログラミング学習支援システムJPLASのステートメント補充問題のオフライン解答機能

    TANG Lewei, 舩曵信生, 石原信也, 栗林稔

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   68th   2017

  • A Channel Assignment Extension of Holding Access-Point Assignment Algorithm for Wireless Local-Area Networks

    116 ( 382 )   95 - 100   2016.12

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  • A Development of Parameter Optimization Tool and Its Application to Throughput Estimation Model for Wireless LANs

    谷口知弘, 舩曵信生, 栗林稔, SOE LWIN Kyaw, SUMON KUMAR Debnath, KHIN ZAW Khin

    電子情報通信学会技術研究報告   116 ( 382(NS2016 118-140) )   89 - 94   2016.12

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  • Raspberry Pi Configuration for Access-Point and Its Throughput Measurements in IEEE802.11n Wireless Networks (ネットワークシステム)

    KUMAR DEBNATH Sumon, 舩曵 信生, SOE LWIN Kyaw, SELIM AL MAMUN Md., WIDYATRA SUDIBYO Rahardhita, HUDA Samsul

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 382 )   101 - 106   2016.12

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  • Implementations of Problem Assignment and Offline Fill-in-blank Problem Learning Functions in Java Programming Learning Assistant System

    佐々木伸, 舩曵信生, 栗林稔, 石原信也

    電子情報通信学会技術研究報告   116 ( 351(ET2016 66-77) )   33 - 38   2016.12

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  • Offline Answering Function for Code Writing Problem in Java Programming Learning Assistant System

    WANG Yingxin, 舩曵信生, 栗林稔, 石原信也

    電子情報通信学会技術研究報告   116 ( 351(ET2016 66-77) )   39 - 44   2016.12

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  • Development of Aesthetic QR Code Encoder for Arbitrary Image

    行地将智, 栗林稔, CHANG Ee-Chien, 舩曵信生, 石原信也

    電子情報通信学会技術研究報告   116 ( 302(EA2016 48-67) )   49 - 54   2016.11

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  • Throughput Measurements for Access-Point Setup Optimization in IEEE802.11n Wireless Networks (ネットワークシステム) -- (WDN特集セッション)

    ソウ ルウィン キョウ, 舩曵 信生, キン ゾウ キン, セリム アル マムン ムハマド, 栗林 稔

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 149 )   27 - 32   2016.7

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  • Throughput Measurements for Access-Point Setup Optimization in IEEE802.11n Wireless Networks (高信頼制御通信) -- (WDN特集セッション)

    ソウ ルウィン キョウ, 舩曵 信生, キン ゾウ キン, セリム アル マムン ムハマド, 栗林 稔

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 145 )   45 - 50   2016.7

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  • Throughput Measurements for Access-Point Setup Optimization in IEEE802.11n Wireless Networks (無線通信システム) -- (WDN特集セッション)

    ソウ ルウィン キョウ, 舩曵 信生, キン ゾウ キン, セリム アル マムン ムハマド, 栗林 稔

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 147 )   75 - 80   2016.7

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  • Considerations of Some Obfuscated Operations on the Security of Watermarking Schemes under the Kerckhoffs' Principle

    山下 晃一郎, 栗林 稔, 舩曵 信生

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 129 )   7 - 12   2016.7

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  • A Study of Employment of Error Correcting Codes for the Watermarking Scheme Considering the Characteristic of Noise

    重本章吾, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告   116 ( 130(SITE2016 7-31) )   1 - 6   2016.7

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  • A Proposal of Automatic Test Code Generation Tool for Java Programming Learning Assistant System

    日下涼太, 舩曵信生, 栗林稔, 石原信也

    電子情報通信学会技術研究報告   116 ( 85(ET2016 8-20) )   41 - 46   2016.6

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  • A Proposal of Coding Rule for Java Programming Learning Assistant System Using MVC Model and Its Implementation

    石原信也, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告   116 ( 85(ET2016 8-20) )   47 - 52   2016.6

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  • A Study of Holding Access-Point Assignment Algorithm for Wireless Local-Area Networks

    116 ( 8 )   11 - 16   2016.4

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  • BS-3-31 EVALUATIONS OF ACTIVE ACCESS-POINT CONFIGURATION ALGORITHM UNDER LIMITED MOBILE ROUTER ALLOCATIONS(BS-3. Advanced Networking Technologies for Innovative Information Networks)

    Mamun Md. Selim Al, Islam Md. Ezharul, Debnath Sumon Kumar, Funabiki Nobuo

    Proceedings of the IEICE General Conference   2016 ( 2 )   "S - 72"-"S-73"   2016.3

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    Previously, we proposed an active access point (AP) configuration algorithm with the dynamic mobile router placement using the K-means algorithm to realize the elastic Wireless Local-Area Network (WLAN) system. However, this algorithm assumed that mobile routers can be freely placed at any location in the network, although they should be managed personally by their owners and thus, it becomes unrealistic. In this paper, we consider the locations of hosts as the candidate locations for the mobile routers, because host owners may use mobile routers for the Internet access. We compare the throughput performance of the limited mobile router locations with the previous free locations using the WIMNET simulator.

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  • BS-3-33 PERFORMANCE EVALUATIONS OF ELASTIC WLAN SYSTEM TESTBED(BS-3. Advanced Networking Technologies for Innovative Information Networks)

    Islam Ezharul, Funabiki Nobuo, Lwin Kyaw Soe, Mamun Md. Selim Al, Debnath Sumon Kumar, Kuribayashi Minoru

    Proceedings of the IEICE General Conference   2016 ( 2 )   "S - 76"-"S-77"   2016.3

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    The elastic wireless local-area network (WLAN) system has been proposed as an adaptive and elastic WLAN system to traffic load changes in the network. Using Linux PCs, we implemented a testbed for this system that collects necessary information for the Access-Point (AP) aggregation algorithm to determine the activation/deactivation of APs by using Linux commands. Then, it controls the active APs and the associations of hosts based on the algorithm output. In this paper, we present performance evaluations of this elastic WLAN system testbed in two network scenarios in our building.

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  • BS-3-35 THROUGHPUT MEASUREMENTS WITH VARIOUS INDOOR AP PLACEMENT CONDITIONS FOR IEEE802.11N WIRELESS NETWORKS(BS-3. Advanced Networking Technologies for Innovative Information Networks)

    Lwin Kyaw Soe, Funabiki Nobuo, Islam Md. Ezharul

    Proceedings of the IEICE General Conference   2016 ( 2 )   "S - 80"-"S-81"   2016.3

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    Recently, the IEEE802.11n protocol has become popular for wireless local-area networks (WLANs). It adopts the MIMO (Multiple-Input-Multiple-Output) technology for high-speed data transmissions using multiple antennas. As a result, the device can be influenced by the installation environment in receiving/transmitting signals. This paper presents experimental performance evaluations of IEEE802.11n devices for WLAN by focusing on throughputs versus placement heights and orientations in indoor environments. Our results show that throughput performance is strongly affected by the placement heights and the orientations of access point (AP). These results should be considered in optimizing the placement of APs in the network field.

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  • A Proposal of Readable Code Learning Tool for Java Programming

    小川卓也, 舩曵信生, 栗林稔, 石原信也, 天野憲樹

    電子情報通信学会技術研究報告   115 ( 419(MSS2015 35-66) )   35 - 40   2016.1

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  • A Proposal of Job Scheduling with Performance Measurements by Benchmarks for User PC Computing System

    青柳有輝, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告   115 ( 419(MSS2015 35-66) )   153 - 158   2016.1

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  • Elastic WLAN System Model and Its Implementation on Linux-PC (ソフトウェアサイエンス)

    ISLAM Md. EZHARUL, FUNABIKI Nobuo, KURIBAYASHI Minoru

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   115 ( 420 )   147 - 152   2016.1

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  • Elastic WLAN System Model and Its Implementation on Linux-PC (システム数理と応用)

    ISLAM Md. EZHARUL, FUNABIKI Nobuo, KURIBAYASHI Minoru

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   115 ( 419 )   147 - 152   2016.1

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  • Value trace problems for graph theory algorithms in Java programming learning assistant system

    Nobuo Funabiki, Khin Khin Zaw, Minoru Kuribayashi, Wen-Chung Kao

    2016 5th International Conference on Educational and Information Technology (ICEIT 2016)   2016

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  • A core blank element selection algorithm for code reading studies by fill-in-blank problems in Java programming learning assistant system

    Khin Khin Zaw, Nobuo Funabiki

    The 7th International Conference on Science and Engineering 2016 (7th ICSE 2016)   204 - 208   2016

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  • Applications of coding rule learning function to workbook codes for Java programming learning assistant system

    Nobuo Funabiki, Shinpei Matsumoto, Khin Khin Zaw, Wen-Chung Kao

    The 7th International Conference on Science and Engineering 2016 (7th ICSE 2016)   1170 - 1175   2016

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  • A minimax approach for access-point setup optimization using throughput measurements in IEEE802.11n wireless networks

    Kyaw Soe Lwin, Nobuo Funabiki, Khin Khin Zaw, Md. Selim Al Mamun, Minoru Kuribayashi

    The Fourth International Symposium on Computing and Networking (CANDAR, ASON)   311 - 317   2016

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    DOI: 10.1109/CANDAR.2016.0062

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  • A Channel Assignment Extension of Active Access-Point Configuration Algorithm for Elastic WLAN System under Limited Channels

    Md. Selim Al Mamun, Sumon Kumar Debnath, Kyaw Soe Lwin, Nobuo Funabiki

    2016 FOURTH INTERNATIONAL SYMPOSIUM ON COMPUTING AND NETWORKING (CANDAR)   318 - 324   2016

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    Previously, we proposed the active access-point (AP) configuration algorithm for elastic Wireless Local-Area Network (WLAN) systems using heterogeneous APs. This algorithm activates or deactivates APs depending on traffic demands, assuming that any active AP can use a different channel to avoid interferences among APs. However, the number of non-interfered channels in IEEE 802.11 protocols is limited. In this paper, we propose an extension of this algorithm to consider the channel assignment to the active APs under this limitation. After the channel assignment to the active APs, AP associations of hosts are improved to further minimize interferences by averaging loads among different channels. The effectiveness of our proposal is evaluated using the WIMNET simulator.

    DOI: 10.1109/CANDAR.2016.32

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  • An active access-point configuration algorithm for elastic wireless local-area network system using heterogeneous devices

    Khin Khin Zaw, Nobuo Funabiki, Wen-Chung Kao

    International Journal of Networking and Computing   6 ( 2 )   395 - 419   2016

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  • Throughput measurements for access-point installation optimization in IEEE802.11n wireless networks

    Nobuo Funabiki, Kyaw Soe Lwin, Minoru Kuribayashi, I-Wei Lai

    2016 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW 2016)   324 - 325   2016

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    DOI: 10.1109/ICCE-TW.2016.7520994

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  • Worker PC Performance Measurements Using Benchmarks for User-PC Computing System

    Nobuo Funabiki, Yuki Aoyagi, Minoru Kuribayashi, Wen-Chun Kao

    2016 IEEE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS-TAIWAN (ICCE-TW)   277 - 278   2016

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    The User-PC computing system (UPC) has been studied to provide a parallel computing platform for members in a group using idling computing resources in personal computers (PCs) of them. UPC adopts the master-worker model where we have implemented the programs for the master on Linux and for the worker on Linux and Windows. However, the current job scheduling method does not consider the real performance of a worker PC. In this paper, we implement a function to measure the performance of a worker PC using two benchmark programs. The experiment results for six PCs in our group show that there are three times difference in the CPU performance and eight times difference in the disk performance.

    DOI: 10.1109/ICCE-TW.2016.7521026

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  • Offline Answering Function for Fill-in-blank Problems in Java Programming Learning Assistant System

    Nobuo Funabiki, Hiroki Masaoka, Nobuya Ishihara, I-Wei Lai, Wen-Chung Kao

    2016 IEEE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS-TAIWAN (ICCE-TW)   315 - 316   2016

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    To assist Java programming educations, we have developed a Web-based Java Programming Learning Assistant System (JPLAS). JPLAS provides fill-in-blank problems to let students study the grammar and the code structure for Java by filling blank elements in a high-quality code that are composed of reserved words, identifiers, and control symbols. However, students can answer the problems only when connected with the Internet, which limits the time and place for them to use JPLAS. In this paper, we implement the offline answering function for fill-in-blank problems in JPLAS. To avoid cheating by students, we adopt the hash function and the message authentication technique. We confirm the effectiveness of our proposal through applications to the Java programming course in our department.

    DOI: 10.1109/ICCE-TW.2016.7521045

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  • Toward Personalized Learning in JPLAS: Generating and Scoring Functions for Debugging Questions

    Takato Mohri, Shingo Yamaguchi, Nobuo Funabiki

    2016 IEEE 5TH GLOBAL CONFERENCE ON CONSUMER ELECTRONICS   216 - 219   2016

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    Today, some Java program learning support systems have been proposed. Each student has his/her own learning level. It is important to give questions suitable for his/her learning level for each student. But it will cause an enormous burden to the teacher. In this paper, we implement the automatic generating function and the scoring function regarding debugging questions in Java programming learning assistant system called JPLAS. We proposed personalized learning with two functions such as automatic generating and scoring of debugging question used in JPLAS. We showed the effectiveness of proposed method with chi-squared test.

    DOI: 10.1109/GCCE.2016.7800392

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  • A Proposal of Three Extensions in Blank Element Selection Algorithm for Java Programming Learning Assistant System

    Khin Khin Zaw, Nobuo Funabiki, Minoru Kuribayashi

    2016 IEEE 5TH GLOBAL CONFERENCE ON CONSUMER ELECTRONICS   3 - 5   2016

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    To assist Java programming educations, we have developed a Web-based Java Programming Learning Assistant System (JPLAS). JPLAS provides fill-in-blank problems to let students study Java grammar and basic programming skills by filling the blanked elements in a given Java code. To generate the feasible problems, we have proposed a blank element selection algorithm using the constraint graph to select as many blanks as possible such that they have grammatically correct and unique answers. In this paper, to further increase the number of blanks and control the difficulty of the generated problem, we extend this algorithm by 1) adding operators in conditional expressions for blank candidates, 2) improving the edge generation method in the constraint graph to increase the number of blanks, and 3) introducing two parameters to change the frequency of selecting blanks. To verify the effectiveness, we apply the extended algorithm to 55 Java codes for fundamental data structure or algorithms, and confirm that these extensions can increase the number of blanks and change the problem difficulty.

    DOI: 10.1109/GCCE.2016.7800312

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  • Analysis of Fill-in-blank Problem Solution Results in Java Programming Course

    Nobuo Funabiki, Tana, Nobuya Ishihara, Wen-Chung Kao

    2016 IEEE 5TH GLOBAL CONFERENCE ON CONSUMER ELECTRONICS   479 - 480   2016

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    For advancing the educational quality of Java programming, we have proposed and implemented the Java Programming Learning Assistant System (JPLAS) as a Web application system. JPLAS offers fill-in-blank problems that request students to fill in the blank elements in a given Java code to study Java grammar and basic programming skills. In past years, we have utilized fill-in-blank problems at our Java programming courses. In this paper, we analyze solution results of students taking the course in 2015, and confirm the relatively high correlation between solution performances and course grades.

    DOI: 10.1109/GCCE.2016.7800486

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  • A Proposal of Coding Rule Learning Function in Java Programming Learning Assistant System

    Nobuo Funabiki, Takuya Ogawa, Nobuya Ishihara, Minoni Kuribayashi, Wen-Chung Kao

    PROCEEDINGS OF 2016 10TH INTERNATIONAL CONFERENCE ON COMPLEX, INTELLIGENT, AND SOFTWARE INTENSIVE SYSTEMS (CISIS)   561 - 566   2016

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    Recently, Java has been educated in many universities and professional schools due to reliability, portability, and scalability. However, because of its limited time in Java programming courses, coding rules arc rarely educated. As a result, codes made by students become far from readable codes. In this paper, we propose a coding rule learning function using static code analyzers in Java Programming Learning Assistant System (JPLAS), targeting students who have accomplished the grammar learning and are going to write practical codes for final projects. Coding rules for this function consist of naming rules, coding styles, and potential problems. We evaluate the improvement of readability in four codes refined by this function and the usability of this function through the questionnaires completed by five students. In future studies, we expect that this function will be employed in Java programming courses.

    DOI: 10.1109/CISIS.2016.94

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  • A workbook design for fill-in-blank problems in Java programming learning assistant system

    Nobuo Funabiki, Khin Khin Zaw, Wen-Chung Kao

    The 11-th International Conference on Broadband and Wireless Computing, Communication and Applications (BWCCA2016)   331 - 342   2016

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  • Analysis of fill-in-blank problem solutions and extensions of blank element selection algorithm for Java programming learning assistant system

    Nobuo Funabiki, Tana, Khin Khin Zaw, Nobuya Ishihara, Wen-Chung Kao

    The World Congress on Engineering and Computer Science 2016 (WCECS 2016)   237 - 242   2016

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  • A Proposal of Recipe Conversion Algorithm for Cooking-Step Schedule Optimization

    115 ( 221 )   67 - 72   2015.9

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  • BS-6-2 A Blank Line Selection Algorithm for Value Trace Problem in Java Programming Learning Assistant System(BS-6.Network and service Design, Control and Management)

    Zaw Khin Khin, Funabiki Nobuo

    Proceedings of the Society Conference of IEICE   2015 ( 2 )   "S - 19"-"S-20"   2015.8

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    To cultivate the code reading capability of Java novice students, we have studied the value trace problem for the Web-based Java Programming Learning Assistant System (JPLAS). This problem asks students to trace actual values of important variables in fundamental data structure or algorithms. To realize the automatic problem generation, the whole sequence of changing data of such variables are output in lines by executing the code for the data structure or algorithm. Then, output data lines that have difference from their previous lines are blanked to be filled. In this paper, we propose the blank line selection algorithm for the value trace problem, and show an example of the generated problem for the insertion sort algorithm.

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  • A Cooking-Step Scheduling Algorithm with Guidance System for Homemade Cooking

    Yukiko Matsushima, Nobuo Funabiki

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS   E98D ( 8 )   1439 - 1448   2015.8

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    Homemade cooking plays a key role for a healthy and cost-efficient life. Unfortunately, preparing multiple dishes is generally time-consuming. In this paper, an algorithm is proposed to minimize the cooking time by scheduling the cooking-step of multiple dishes. The cooking procedure of a dish is divided into a sequence of six types of cooking-steps to consider the constraints in cooks and cooking utensils in a kitchen. A cooking model is presented to optimize the cooking-step schedule and estimate the cooking time for a given starting order of dishes under various constraints of cooks and utensils. Then, a high-quality schedule is sought by repeating the generation of a new order and the model application based on exhaustive search and simulated annealing. Our simulation results and cooking experiments confirm the effectiveness of our proposal.

    DOI: 10.1587/transinf.2015EDP7048

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  • An Active Access-Point Configuration Algorithm for Wireless Local Area Networks with Heterogeneous Devices (ネットワークシステム)

    セリム アル マムン ムハマド, エズハルル イスラム ムハマド, 舩曵 信生

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   115 ( 159 )   147 - 152   2015.7

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  • Performance evaluations for multi-user MIMO using WIMNET simulator

    115 ( 159 )   141 - 146   2015.7

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  • An Implementation and Evaluation of Job Scheduling Methods for User-PC Computing System

    AOYAGI Yuki, FUNABIKI Nobuo, FUKUSHI Masaru

    IEICE technical report   114 ( 477 )   553 - 558   2015.3

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    We have proposed and implemented User-PC computing (UPC) system as a parallel computing platform using idling computing resources (CPU cycles) in personal computers (PCs) of members in the same organization such as a laboratory in a university. Because the original UPC system has adopted a sequential job scheduling method which assigns new jobs to workers in the descending order of their performance up to its permissible number, some workers may not be assigned any job. In this paper, we propose static and dynamic round-robin (RR)job scheduling methods of assigning a predefined number of new jobs to the workers in round-robin fashion. The dynamic RR method considers the change of the worker's performance by using the CPU time of recent jobs. Our experiment results show that when the performance difference among workers and the number of jobs are small, both RR methods performs well, and when both of them are large, the dynamic RR method shows better performance.

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  • Active Access Point Selection Algorithm for Scalable Wireless Mesh Networks

    FUJITA Sho, FUNABIKI Nobuo

    IEICE technical report   114 ( 477 )   427 - 432   2015.3

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    The wireless Internet-access mesh network (WIMNET) can realize an inexpensive scalable Internet-access network by using multiple access points (APs) connected by wireless links. We have proposed the active AP selection algorithm of selecting active APs for high-speed and low-cost communications in large WIMNET. In this paper, we extend this algorithm to improve the performance of WIMNET by introducing mobile routers. Besides, we present the plural AP deactivation procedure using link speeds for better practicality. We show the effectiveness of the proposals through simulations in two instances.

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  • Javaプログラミング授業におけるエレメント空欄補充問題の実践

    塔 娜, 舩曵 信生, 石原 信也

    研究報告コンピュータと教育(CE)   2015 ( 11 )   1 - 8   2015.2

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    本グループでは,プログラミング言語 Java の学習支援のために,Web を用いた Java プログラミング学習支援システム JPLAS(Java Programming Learning Assistant System) を開発している.JPLAS では,Java の初学者を対象としたエレメント空欄補充問題を提供しており,グラフ理論を用いた解の一意性を充たす問題生成のためのアルゴリズムを提案している.今回,本アルゴリズムを用いてエレメント空欄補充問題を生成し,本学科の Java プログラミング授業で実践活用した結果を報告する.

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  • 学生用PCを用いたユーザPCコンピューティングシステムのWebインターフェース

    金 奉洙, 舩曵 信生

    研究報告コンピュータと教育(CE)   2015 ( 7 )   1 - 8   2015.2

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    本グループでは,研究室内の学生が使用するパーソナルコンピュータ (PC) の空き資源を利用して,大規模シミュレーションなどの計算プロジェクトを実行する,ユーザ PC コンピューティングシステム UPC(User-PC Computing System) を開発している.UPC では,大規模コンピューティング環境の実現に関して,運営コストの低減と利便性の向上の実現を目指している.UPC では,計算プロジェクトの実行には,コマンド入力が必要となっており,その知識に乏しいユーザには UPC の使用が容易ではない.そこで本研究では,ブラウザで UPC の利用を可能とするために,Web 技術を用いた UPC ユーザインターフェース機能を開発する.UPC サーバ間とファイル共有ソフトを用いて連携することで,異なる複数の UPC へのインターフェース機能の提供を可能としている.本稿では,今回開発した UPC インターフェース機能の構成を示す.

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  • Javaコードのクラス間連携理解のためのコアステートメント抽出アルゴリズム

    石原 信也, 舩曵 信生

    研究報告コンピュータと教育(CE)   2015 ( 10 )   1 - 8   2015.2

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    Java プログラミング学習では,既存のソースコードを読み,その処理や構造を理解することが有効である.このコードリーディングをプログラミング教育に取り入れるためには,学習者がソースコードを理解したか否かを確認する方法が必要となる.そのため本グループでは,ソースコード中の肝要なステートメント (コアステートメント) を空欄とし,その記述を要求する,ステートメント空欄補充問題の提案と授業適用を行っている.本研究では,ソースコード中の空欄化すべきコアステートメント抽出アルゴリズムを提案する.本アルゴリズムでは,コアステートメントとして,1) 要求仕様を充たすためのアルゴリズム要素,2) オブジェクト指向言語の特徴であるクラス間連携要素,3) データベースなど外部機能との連携要素,の 3 種類を想定し,それぞれの抽出法を定義している.提案アルゴリズムを実装し,5 つの Java ソースコードに適用して得られたコアステートメントを,Java 学習者による抽出結果と比較した.その結果,両者に高い一致がみられ,提案アルゴリズムの有効性が確認された.

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  • Revocable Group Signatures with Compact Revocation List Using Accumulators

    Toru Nakanishi, Nobuo Funabiki

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E98A ( 1 )   117 - 131   2015.1

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    A group signature scheme allows a group member to anonymously sign a message on behalf of the group. One of the important issues is the member revocation, and lots of revocable schemes have been proposed so far. A scheme recently proposed by Libert et al. achieves that O(1) or O(log N) efficiency of communication and computation except for the revocation list size (also the revocation cost), for the total number of members N and the number of revoked members R. However, since a signature is required for each subset separated from the set of non-revoked members, the size is about 900R Bytes in the 128-bit security. In the case of R = 100, 000, it amounts to about 80MB. In this paper, we extend the scheme to reduce the revocation list (also the revocation cost), by accumulating T subsets, which is signed for the revocation list. The revocation list size is reduced by 1/T. Unfortunately, the public key size, membership certificate size and the cost of a witness computation needed for signing increase related to T.

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  • Cross-Layer Selective Routing for Active Access-Point Minimization in Wireless Mesh Network

    I-Wei Lai, Wen-Chung Kao, Nobuo Funabiki

    2015 IEEE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS - TAIWAN (ICCE-TW)   482 - 483   2015

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    A Wireless Internet-access Mesh NETwork (WIMNET) provides the scalable and reliable internet access through the multiple access points (APs) and wireless relay communications. In particular, by redundantly deploying APs in the network field, the WIMNET becomes robust to the link or AP failure. However, these redundant APs increase the power consumption, and thus the number of active APs should be minimized by the selective routing without loss of the transmission performance. In this work, we propose to reinvent such selective routing algorithm by exploiting physical-layer technologies. An exemplar numerical simulation demonstrates that this cross-layer selective routing can further minimize the number of APs, leading to less operational costs in WIMNET.

    DOI: 10.1109/ICCE-TW.2015.7217010

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  • An Operator Fill-in-blank Problem for Algorithm Understanding in Java Programming Learning Assistant System

    Nobuo Funabiki, Shin Sasaki, Ta Na, Wen-Chung Kao

    2015 IEEE 4TH GLOBAL CONFERENCE ON CONSUMER ELECTRONICS (GCCE)   346 - 347   2015

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    A Web-based Java Programming Learning Assistant System (JPLAS) has been developed to help novice students studying Java programming through self-learning. As one function, JPLAS provides the fill-in-blank problem that requests filling in the blank elements in a given code with several blanks. Currently, reserved words, identifiers, or control symbols can be blanked to have unique correct answers, which may be solved without reading the code carefully. In this paper, we propose to additionally blank operators in conditional expressions of core statements in the code so that students can understand the structure to realize the specification. For preliminary evaluations, we generated six operator fill-in-blank problems, and assigned them to students where the number of answer submissions per blank has increased from that of conventional problems.

    DOI: 10.1109/GCCE.2015.7398539

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  • A proposal of statement fill-in-blank problem using program dependence graph in Java programming learning assistant system

    Nobuya Ishihara, Nobuo Funabiki, Wen-Chung Kao

    Information Engineering Express   1 ( 3 )   19 - 28   2015

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  • A proposal of value trace problem for algorithm code reading in Java programming learning assistant system

    Khin Khin Zaw, Nobuo Funabiki, Wen-Chung Kao

    Information Engineering Express   1 ( 3 )   9 - 18   2015

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  • A Worker Implementation on Windows OS for User-PC Computing System

    Nobuo Funabiki, Yusuke Asai, Yuuki Aoyagi, Wen-Chung Kao

    PROCEEDINGS OF 2015 THIRD INTERNATIONAL SYMPOSIUM ON COMPUTING AND NETWORKING (CANDAR)   279 - 282   2015

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    Previously, we have proposed and implemented the User-PC computing (UPC) system as a highly parallel computing platform using idling CPU cycles in members' personal computers (PCs) of the same organization such as a laboratory in a university. This implementation for both the UPC master and the UPC worker covers only Linux OS. However, currently a lot of PCs adopt Windows OS. In this paper, we present an implementation of the UPC worker for Windows OS based on the implementation for Linux OS. During the implementation, we realize the CPU usage limitation and the automatic start-up of the worker program which can reduce loads for PC owner, aside from basic functions of master communications and job executions. Through evaluations, we conclude that the CPU usage rate does not exceed the given limitation except for starting time, and the job execution time on Windows is about twice the use of that on Linux.

    DOI: 10.1109/CANDAR.2015.17

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  • A Function for Generating Debugging Questions in a Java Programming Learning Assistant System

    Shingo Yamaguchi, Takato Mohri, Nobuo Funabiki

    2015 IEEE 4TH GLOBAL CONFERENCE ON CONSUMER ELECTRONICS (GCCE)   350 - 353   2015

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    Today many universities offer courses for learning Java programming. Debugging cannot be avoided in programming. Nevertheless, there are not many chances for students to debugging programs, particularly written by another person. In this paper, for increasing that chance, we propose a function for generating a new kind of questions that are called debugging questions. A debugging question requires students to debug a program mixed with bugs. This function provides three ways of mixing bugs: deletion of reserved words, swapping of variables, and replacement by lists. We implemented this function into a Java programming learning assistant system, called JPLAS. We also discussed the usefulness by evaluating the function.

    DOI: 10.1109/GCCE.2015.7398573

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  • An Extension of Statement Fill-in-blank Problem in Java Programming Learning Assistant System

    Nobuya Ishihara, Nobuo Funabiki, Ta Na, Wen-Chung Kao

    2015 IEEE 4TH GLOBAL CONFERENCE ON CONSUMER ELECTRONICS (GCCE)   354 - 358   2015

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    To assist Java programming studies, we have developed a Web-based Java Programming Learning Assistant System (JPLAS). As one function in JPLAS, it provides a statement fill-in-blank problem that asks students to fill in proper statements to blanked ones in a Java code, so as to cultivate simultaneous code reading and writing abilities. Previously, we blanked only the core statement in a code with one class using the Program Dependence Graph (PDG), where we do not consider the features of object-oriented programming in Java that uses multiple classes and collaborations with other systems such as database. In this paper, we extend the statement fill-in-blank problem to deal with these features. We verify the effectiveness of our proposal through the Java programming course at our department.

    DOI: 10.1109/GCCE.2015.7398543

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  • Correlation Analysis of Fill-in-blank Problem Solutions to Final Programming Results in Java Programming Course

    Ta Na, Nobuo Funabiki, Nobuya Ishihara, Wen-Chung Kao

    2015 IEEE 4TH GLOBAL CONFERENCE ON CONSUMER ELECTRONICS (GCCE)   348 - 349   2015

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    To assist Java programming educations, we have developed a Web-based Java Programming Learning Assistant System (JPLAS). JPLAS provides fill-in-blank problems to study the Java grammar and fundamental programming by filling blank elements that are composed of reserved words, identifiers, and control symbols in a high-quality code. During the last semester, we assigned 121 problems with 1,552 questions to 46 students taking our Java programming course. In this paper, we analyze correlations of problem solving results of students to their final programming results.

    DOI: 10.1109/GCCE.2015.7398542

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  • Active Access-Point Configuration Algorithm with Dynamic Mobile Router Placement for Elastic WLAN System

    Md. Selim Al Mamun, Md. Ezharul Islam, Nobuo Funabiki, I-Wei Lai

    PROCEEDINGS OF 2015 THIRD INTERNATIONAL SYMPOSIUM ON COMPUTING AND NETWORKING (CANDAR)   246 - 252   2015

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    Recently, a variety of wireless access points (APs) have been deployed by many organizations to meet different traffic demands. Previously, we proposed an active AP configuration algorithm that activates or deactivates heterogeneous AP devices depending on the traffic demand and network topology, in order to realize the elastic Wireless Local-Area Network (WLAN) system. Unfortunately, in this algorithm, the locations of the mobile routers have been fixed as the algorithm input, although they can be placed flexibly as portable APs using cellular networks. In this paper, we consider the elastic WLAN system with mobile routers which can be placed flexibly. The dynamic mobile router placement is proposed for the active AP configuration algorithm to meet stringent traffic requirements. Specifically, if some hosts fail to meet the throughput requirements, the locations of additional mobile routers are dynamically determined by applying the Kmeans algorithm to maximize the number of those failed hosts in its coverage. The effectiveness of this location determination is demonstrated by numerical examples with three network scenarios.

    DOI: 10.1109/CANDAR.2015.55

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  • Extensions of Access-Point Aggregation Algorithm for Large-scale Wireless Local Area Networks

    Islam Md. Ezharul, Funabiki Nobuo, Nakanishi Toru

    IJNC   5 ( 1 )   200 - 222   2015

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    Recently, many organizations such as universities and companies have deployed wireless local area networks (WLANs) to cover the whole site for ubiquitous network services. In these WLANs, wireless access-points (APs) are often managed independently by different groups such as laboratories or departments. Then, a host may detect signals from multiple APs, which can degrade the communication performance due to radio interferences among them and increase operational costs. Previously, we proposed the AP aggregation algorithm to solve this problem by minimizing the number of active APs through aggregating them using the virtual AP technology. However, our extensive simulations in various instances found that 1) the minimization of active APs sometimes excessively degrades the network performance, and 2) the sequential optimization of host associations does not always reach optimal where slow links are still used. In this paper, we propose two extensions of the AP aggregation algorithm to solve these problems by 1) ensuring the minimum average throughput for any host by adding active APs and 2) further optimizing host associations by changing multiple hosts simultaneously in the host association finalization phase. We verify the effectiveness through simulations in four network instances using the WIMNET simulator.

    DOI: 10.15803/ijnc.5.1_200

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  • Practices of Fill-in-blank Problems in Java Programming Course

    Nobuo Funabiki Tana, Nobuya Ishihara

    2015 IEEE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS - TAIWAN (ICCE-TW)   120 - 121   2015

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    To assist Java programming educations, we have developed a Web-based Java Programming Learning Assistant System (JPLAS). JPLAS provides fill-in-blank problems to study the Java grammar by filling blank elements in a high-quality code that are composed of reserved words, identifiers, and control symbols. A graph-based blank element selection algorithm has been proposed to automatically select as many blanks as possible that have grammatically correct unique answers. In this paper, we show and discuss their application results to a Java programming course in our department.

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  • Concept of User-PC Computing System

    Nobuo Funabiki, Bongsu Kim, Yuki Aoyagi

    2015 IEEE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS - TAIWAN (ICCE-TW)   480 - 481   2015

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    The User-PC computing system (UPC) is a technology of realizing a parallel computing environment using idling computing resources (CPU cycles) in Personal Computers (PCs) of members in the same organization or group such as a laboratory in a university and a section in a company. UPC can resolve drawbacks in the registration of computing projects, the reliability of computing results, and the continuity of computations that may often happen in Volunteer Computing (VC) systems using voluntary PCs in the Internet. Thus, UPC can be easily and comfortably used by computing users. In this paper, we show the concept of UPC and preliminary evaluations.

    DOI: 10.1109/ICCE-TW.2015.7217009

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  • A proposal of graph-based blank element selection algorithm for Java programming learning with fill-in-blank problems

    Tana, Nobuo Funabiki, Nobuya Ishihara

    The International MultiConference of Engineers and Computer Scientists 2015 (IMECS 2015)   2015

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  • Practices of Cooking-Step Scheduling Algorithm for Homemade Cooking

    Yukiko Matsushima, Nobuo Funabiki

    2015 IIAI 4TH INTERNATIONAL CONGRESS ON ADVANCED APPLIED INFORMATICS (IIAI-AAI)   500 - 505   2015

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    Homemade cooking is essential not only for keeping healthy and cost-efficient dietary lives but also for constructing good family relationships and identities. Previously, we proposed the cooking-step scheduling algorithm to help homemade cooking by finding a schedule of applying the cooking-steps for multiple dishes with minimal cooking time. In this algorithm, the cooking procedure for each dish is divided into a sequence of six types of cooking-steps to consider the constraints in cooks and cooking utensils in a kitchen. In this paper, we conduct practices of the algorithm in actually cooking dishes by following the generated schedules to show the effectiveness.

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  • A Concept of Value Trace Problem for Java Code Reading Education

    Khin Khin Zaw, Nobuo Funabiki

    2015 IIAI 4TH INTERNATIONAL CONGRESS ON ADVANCED APPLIED INFORMATICS (IIAI-AAI)   253 - 258   2015

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    To assist Java programming educations, we have developed a Web-based Java Programming Learning Assistant System (JPLAS). JPLAS provides the fill-in-blank problem to help novice students studying Java programming at home, where some elements in a high-quality code including reserved words, identifiers, and control symbols are blanked to be filled by students. Unfortunately, this problem may be solved without reading out the algorithm in the code if students are familiar with Java grammar to some extent. In this paper, to further cultivate the code reading capability of students, we propose a concept of the value trace problem to ask the actual values of important variables in a code implementing some fundamental data structure or algorithm. A value trace problem can be generated by: 1) selecting a high-quality class code for the algorithm to be studied, 2) making the main class to instantiate the class in 1) if it does not contain the main method, 3) adding the functions to output variable values in questions into a text file, 4) preparing the input file to the code in 3) if necessary, 5) running this code to obtain the set of variable values in the text file, 6) blanking some values from the text file to be filled by students, and 7) uploading the final code, the blanked text file, and the correct answer file into the JPLAS server, and adding the brief description on the algorithm for a new assignment. To verify the feasibility of this concept, we manually generated five problems and asked four students with high Java programming skills in our group to solve them. Then, we analyzed the difficulty of the value trace problem for Quick Sort.

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  • A Proposal of Statement Fill-in-blank Problem in Java Programming Learning Assistant System

    Nobuya Ishihara, Nobuo Funabiki

    2015 IIAI 4TH INTERNATIONAL CONGRESS ON ADVANCED APPLIED INFORMATICS (IIAI-AAI)   247 - 252   2015

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    As a reliable, portable, and practical programming language, Java has been educated in many universities and professional schools. To assist Java educations, we have developed a Web-based Java Programming Learning Assistant System (JPLAS). JPLAS provides the element fill-in-blank problem and the code writing problem. The former problem is designed for novice students to study the grammar and writing style of Java by filling correct words to the blanks in a given Java code that are automatically marked by checking coincidences with correct ones. The latter problem is for students to study writing Java codes for specifications described in natural language that are automatically verified using the test-driven development (TDD) method. Unfortunately, the transition between two problems is not smooth due to the difference in difficulties. In this paper, we propose the statement fill-in-blank problem in JPLAS to fill the gap by asking students to write one whole statement in a code where the correctness is verified by the TDD method. The blank statement is selected by generating the Program Dependence Graph (PDG) of the code and finding the statement that has the largest dependence with other ones. We verify the effectiveness of our proposal through applications to the Java programming course in our department.

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  • An Anonymous Reputation System with Reputation Secrecy for Manager

    Toru Nakanishi, Nobuo Funabiki

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E97A ( 12 )   2325 - 2335   2014.12

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    In anonymous reputation systems, where after an interaction between anonymous users, one of the users evaluates the peer by giving a rating. Ratings for a user are accumulated, which becomes the reputation of the user. By using the reputation, we can know the reliability of an anonymous user. Previously, anonymous reputation systems have been proposed, using an anonymous e-cash scheme. However, in the e-cash-based systems, the bank grasps the accumulated reputations for all users, and the fluctuation of reputations. These are private information for users. Furthermore, the timing attack using the deposit times is possible, which makes the anonymity weak. In this paper, we propose an anonymous reputation system, where the reputations of users are secret for even the reputation manager such as the bank. Our approach is to adopt an anonymous credential certifying the accumulated reputation of a user. Initially a user registers with the reputation manager, and is issued an initial certificate. After each interaction with a rater, the user as the ratee obtains an updated certificate certifying the previous reputation summed up by the current rating. The update protocol is based on the zero-knowledge proofs, and thus the reputations are secret for the reputation manager. On the other hand, due to the certificate, the user cannot maliciously alter his reputation.

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  • A Proposal of Blank Element Selection Algorithm for Java Programming Learning

    Tana, FUNABIKI Nobuo, ISHIHARA Nobuya

    Technical report of IEICE. SS   114 ( 271 )   1 - 6   2014.10

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    The programming language Java has been widely used in industries and educated in educational institutes due to its excellent developing environments, reliability, and portability. To assist Java educations, we have developed a Web-based Java Programming Learning Assistant System (JPLAS). JPLAS provides the fill-in-blank problem for Java novice students to learn it by filling proper elements into blanks in a Java code. In the paper, we propose a blank element selection algorithm to find a feasible problem that has the unique solution for any blank. This algorithm first generates a simple graph such that a vertex represents a candidate element in the code and an edge is made between two vertices that can be blanked simultaneously. Then, it extracts a clique of the graph to maximize the number of feasible blanks. We applied the algorithm to 100 Java codes and checked the uniqueness of the solutions manually. The results show that by showing the execution results of the three codes, we confirmed the uniqueness of the solutions.

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  • A Study of Access-Point Allocation Algorithm for Scalable Wireless Mesh Networks in Indoor Environments

    FARAG Tamer, FUNABIKI Nobuo, HASSAN Walaa

    IEICE technical report   114 ( 252 )   1 - 6   2014.10

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    Previously, we proposed an access-point (AP) allocation algorithm for scalable Wireless Internet-access Mesh NETwork (WIMNET) with multiple gateways (GWs) and the hop count limitation. The algorithm for K GWs consists of 1) the partition of the network field into K clusters by the K-means algorithm, 2) the sequential AP allocation in each cluster by our AP allocation algorithm for one GW, and 3) the simultaneous routing in K clusters by our routing algorithm considering multiple GWs and the hop count limitation. In this paper, we study the AP allocation algorithm in indoor environments as common fields for WIMNET. We assume that one wall drops the transmission speed by 15%, which is equivalent to 10m increase of the distance in an open space. To handle situations unsuitable to the K-means algorithm where plural GWs are closely located in neighboring rooms, we regard these GWs as one virtual GW, and apply 1) and 2) in the algorithm. Then, we apply 3) to the individual real GWs. We verify the effectiveness of our proposal through simulations in an indoor field using the WIMNET simulator.

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  • A Consideration of Extended Wireless Internet-Access Mesh Network Simulator for MU-MIMO

    TAJIMA Shigeto, FUNABIKI Nobuo, HIGASHINO Teruo

    IEICE technical report   114 ( 252 )   7 - 12   2014.10

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    Recently, IEEE802.11ac has been focused as a new high-speed wireless communication protocol. IEEE802.11ac adopts the frame aggregation that can reduce communication overheads by aggregating multiple frames into one big frame and the MU-MIMO (Multi-User Multi-Input-Multi-Output) that can improve the channel efficiency by allowing simultaneous transmissions to multiple destinations using the same channel. We have studied the efficient use of this protocol in the Wireless Internet-access Mesh NETwork (WIMNET) that provides an expandable Internet-access network by connecting multiple access-points through wireless links. In this paper, we present an extension of the WIMNET simulator that has been developed by our group in considering frame aggregation and MU-MIMO in IEEE802.11ac to evaluate the performance of WIMNET using this protocol. We evaluate the effect of MU-MIMO in WIMNET through simulations using the extended WIMNET simulator.

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  • Robustness Evaluations of Cooking-Step Scheduling Algorithm under Operation Time Fluctuations

    MATSUSHIMA Yukiko, FUNABIKI Nobuo

    114 ( 222 )   5 - 10   2014.9

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    To assist homemade cooking of busy people such as working people, child-growing families, and students, we have proposed a cooking-step scheduling algorithm for multiple dishes such that the total cooking time be minimized. For a given set of dishes where the cooking procedure for each dish is composed of a sequence of cooking-steps requiring certain time, this algorithm generates an optimal schedule for applying the cooking-steps of the dishes by considering the constraints of the cooks and the instruments. In this paper, we evaluate the robustness of this algorithm under time fluctuations in real cooking that can happen by variations of the proficiency of cooks and the cooking environment. First, we developed the evaluation cooking model to simulate the cooking process for a given schedule and time, and conducted simulations with randomly fluctuated time within 30% of the original one. Then, we actually cooked four dishes using the schedule found by the algorithm. In any result, the variation of the total cooking time is small compared to changes of cooking-step time. Thus, the robustness of the algorithm is confirmed.

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  • BS-6-2 Throughput Measurements in Big Room with Different Access Point Locations for IEEE 802.11ac Wireless Networks(BS-6.Network and service Design, Control and Management)

    CHEW Chang Choon, FUNABIKI Nobuo

    Proceedings of the Society Conference of IEICE   2014 ( 2 )   "S - 38"-"S-39"   2014.9

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    The IEEE802.11ac wireless communication protocol has been introduced for high-speed wireless networks. In this paper, we provide throughput measurement results by Transmission Control Protocol (TCP) in a big room with various access point (AP) locations. Our measurement results show that TCP throughputs are greatly affected by AP locations for two-AP cases and are not affected for one-AP cases.

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  • BS-6-1 AN EXTENSION OF ACCESS-POINT AGGREGATION ALGORITHM FOR HOST MOBILITY(BS-6.Network and service Design, Control and Management)

    Islam Md Ezharu, Funabiki Nobuo

    Proceedings of the Society Conference of IEICE   2014 ( 2 )   "S - 36"-"S-37"   2014.9

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    The AP aggregation algorithm has been proposed to reduce the number of active APs in overlapped WLANs by aggregating them to solve the problem of performance degradation due to interferences, and increased operational cost. However, this algorithm does not consider the mobility of hosts, although they usually join or leave the network randomly. In this paper, we propose an extension of the AP aggregation algorithm to deal with the mobility by considering the probability of each host to stay active. We verify the effectiveness of this extension through simulations using the WIM- NET simulator.

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  • Efficient Proofs for Monotone Formulas on Attributes Excluding Restriction in Anonymous Credential System

    SADIAH Shahidatul, NAKANISHI Toru, FUNABIKI Nobuo

    Technical report of IEICE. ISEC   114 ( 203 )   21 - 26   2014.9

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    An anonymous credential system on attributes allows a user to convince a service provider anonymously that he/she owns the certified attributes. Previously, we proposed an anonymous credential scheme to prove the satisfaction of a monotone formula when only one attribute is true for any OR relation. A monotone formula represents any combination of AND relations and OR relations. However, this system has a drawback that it cannot verify a user's certificate such that two or more attributes for an OR relation are true. In this paper, we propose an extended scheme for proofs of arbitrary monotone formula by adopting Linear Homonorphic (LH) signature scheme to generate a certificate that contains the minimum attribute set as required in the verification.

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  • Robustness Evaluations of Cooking-Step Scheduling Algorithm under Operation Time Fluctuations

    38 ( 36 )   5 - 10   2014.9

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  • Throughput Evaluations Using NS-2 for Access-Point Aggregation Algorithm in IEEE802.11n Wireless LANs

    HASSAN Walaa, FUNABIKI Nobuo, ISLAM Md. EZHARUL, FARAG Tamer

    IEICE technical report. Information networks   114 ( 110 )   25 - 30   2014.6

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    The IEEE 802.11-based WiFi wireless technology has been commonly used in efficient wireless local area networks (WLANs). Recently, the IEEE 802.11n protocol among several ones has become popular as higher throughput operations with up to 600 Mbps. For a large-scale WLAN with multiple access-points (APs), we have proposed an access-point aggregation algorithm to minimize the operation cost while maximizing the performance. However, the effectiveness of this algorithm has been verified only through the WIMNET simulator that has been developed by our group as a simple network simulator. In this paper, we implement the modified 802.11n module that has been introduced by Wang and Wei on the NS-2 version 2.34, and evaluate the performance of this algorithm through simulations using it.

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  • An Extension of Access Point Allocation Algorithm for Wireless Mesh Networks with Multiple Gateways and Maximum Hop Limitation

    FARAG Tamer, FUNABIKI Nobuo, HASSAN Walaa

    IEICE technical report. Information networks   114 ( 110 )   31 - 36   2014.6

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    As an inexpensive, scalable Internet-access wireless network, we have studied design optimizations of a Wireless Internet-access Mesh NETwork (WIMNET) that adopts multiple access-points (APs) connected by Wireless Distribution System (WDS). In WIMNET, the proper allocation of APs is essential in ensuring the communication quality while reducing the installation and management costs. Thus, previously we proposed an AP allocation algorithm for WIMNET where only one gateway (GW) to the Internet exists and no hop limitation is imposed. In this study, we extend this algorithm for multiple GWs and the maximum hop limitation, which is common for large-scale WIMNET using WDS. First, for given K GWs, we partition the whole network into K sub-networks using the k-means algorithm such that the hosts in each sub-network connects with one GW. Then, we apply the previous AP allocation algorithm to each sub-network sequentially to allocate the APs. Finally, we apply our existing routing algorithm to obtain the routing path satisfying the hop limitation. We verify the effectiveness of this extended algorithm through simulations in one instance using the WIMNET simulator.

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  • An Extension of Routing Algorithm for Wireless Mesh Networks Considering Frame Aggregation

    TANI Yuma, FUNABIKI Nobuo, TAJIMA Shigeto

    IEICE technical report. Information networks   114 ( 110 )   19 - 24   2014.6

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    As a flexible inexpensive Internet-access network, we have studied the Wireless Internet-access Mesh NETwork (WIMNET) that is composed of wireless interconnected Access-Points (APs). We have proposed routing algorithm for WIMNET under realistic environments such as 1) multiple gateways, 2) communication speed changes, and 3) the limited number of hops. In this study, we extend the algorithm by considering the frame aggregation adopted in the IEEE802.11ac high-speed wireless communication protocol. We verify the effectiveness of our proposal through simulating three instances using the WIMNET simulator.

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  • A Draft Coding Rule for Codes in Java Programming Learning Assistant System

    ISHIHARA Nobuya, FUNABUKI Nobuo

    IEICE technical report. Education technology   114 ( 82 )   57 - 62   2014.6

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    We have developed the Java programming learning support system JPLAS as a Web application using JSP, Servlet, and Java Beans, to support repetitive self-learning of Java programming through automatic verifications of answers from students to assignments. Because the codes in JPLAS have been implemented by students who have newly joined our group and taken over the codes from seniors, their managements and updates have become complicated. At the same time, they do not follow the Web standard including HTML5 and CSS3 that has become popular to realize rich Web clients. In this paper, we propose a draft coding rule to implement codes in JPLAS following the Web standard. By adopting HTML5 and Ajax, this rule makes it possible implementing codes that can be easily maintained by avoiding redundancy.

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  • An Extension of Fill-in-blank Problem Generation Algorithm for Java Programming Learning Assistant System

    Tana, FUNABUKI Nobuo, ISHIHARA Nobuya, OGAWA Takuya

    IEICE technical report. Education technology   114 ( 82 )   63 - 68   2014.6

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    To help Java programming educations in universities and professional schools, we have developed a Web-based Java Programming Learning Assistant System (JPLAS). Since JPLAS provides the fill-in-blank problem function for Java novice students, we have proposed a graph-based fill-in-blank problem generation algorithm for it. In this paper, we extend this algorithm for blanking grammatically related words so as to encourage students studying the Java grammar more deeply. Besides, we evaluate generated problems with up to 20 blanks in a Java code where we have limited maximally 10 blanks previously. We applied problems by the extended algorithm to middle level students and found that the length, numbers of classes and methods, the difficulty of the implemented algorithm, and the existence of comments in the Java code have large influences on the correct solution rate.

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  • An Implementation of Statement Fill-in-blank Problem Function for Java Programming Learning Assistant System

    ISHIHARA Nobuya, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report. Education technology   113 ( 482 )   35 - 40   2014.3

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    We have proposed a Web-based JPLAS (Java Programming Learning Assistant System) to help students studying Java programming by themselves at home. By adopting the Test-Driven Development (TDD) method to verify the codes from students, JPLAS aims to reduce loads of teachers in addition to enhancing learning activities of students. In this paper, we propose and implement the statement fill-in-blank problem function in JPLAS as a trial assistance for code reading that has not been underestimated, although it is very important in studies of programming. In the statement fill-in-blank problem, a student is requested to fill a statement to the blank in a given Java code. By using a Program Dependence Graph (PDG), this function blanks an essential statement in the code. To evaluate our proposal, we generated multiple statement fill-in-blank problems using codes with similar procedures and applied them to students in a Java programming course in our department. Then, we found that the solution time of students decreased as they solved more problems.

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  • A Difficulty Estimation Method of Fill-in-blank Problems for Java Programming Learning Assistant System

    OGAWA Takuya, FUNABIKI Nobuo, NAKANISHI Toru, ISHIHARA Nobuya, NA Ta, AMANO Noriki

    IEICE technical report. Education technology   113 ( 482 )   41 - 46   2014.3

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    In our group, we have proposed a Web-based Java Programing Learning Assistant System (JPLAS) that helps students to study Java programing by themselves and the reduction of the burden on teacher. JPLAS has two kinds of blanks supplement (element fill-in-blank problem, statement fill-in-blank problem). These problems are applied to a student as a self-study problem in the classes of this school for Java programming abecedarians. In this thesis, after having enumerated indexes to estimate the difficulty of the problem that a teacher generated in JPLAS, we propose the index suitable for the difficulty estimate of each problem by performing the correlation analysis with the correct answer rate of each problem by the self-study result. We enable the presentation of the problem that a teacher accepted the level of the student by implementing difficulty estimation method of each fill-in-blank problem in JPLAS.

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  • An Extension of Active Access Point Selection Algorithm Considering Practical Conditions for Wireless Mesh Networks

    FUJITA Sho, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report. Circuits and systems   113 ( 463 )   35 - 40   2014.3

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    The wireless Internet-access mesh network (WIMNET) can realize an inexpensive flexible Internet-access network by using multiple access points (APs) connected by wireless links. For WIMNET with a single Internet Gateway (GW), we have proposed the active AP selection algorithm of selecting active APs from redundantly allocated APs for communications. However, in practical implementations of WIMNET, multiple GWs usually exist and the number of hops between a GW and a host is limited. Furthermore, the communication speed is dynamically changed by the link distance for the new high-speed communication protocol IEEE802.11ac. In this paper, we propose an extension of the active AP selection algorithm to consider these conditions. We verify the effectiveness of our proposal through simulations in four instances using the WIMNET simulator.

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  • File Synchronization Performance using Bittorrent Sync in IEEE802.11ac Wireless Networks

    KIM Bongsu, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report. Circuits and systems   113 ( 463 )   29 - 34   2014.3

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    Recently, Bittorrent Inc. has released a file synchronization software called Bittorrent Sync based on the peer-to-peer file sharing software Bittorrent. Using this software, users can synchronize the files on the designated folders across the multiple devices that are connected through the Internet without using a management server. These devices can be personal computers, smart phones, and tablets using different operating systems. To identify the folders to be synchronized, this software uses a 20-byte secret key that is randomly generated. We have considered the use of Bittorrent Sync to share files among nodes in a large wireless local area network (WLAN), where some nodes may be connected through mulithop wireless links. In this paper, we set up a simple WLAN test bed using the IEEE 802.1 lac protocol that has been recently introduced as a high-speed wireless communication protocol, and measure throughputs when various files with different sizes are synchronized among nodes using the software. Our results show that the throughput is quite high and stable, and a larger file can be transferred in a higher speed than a smaller file.

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  • An Extension of Wireless Internet-Access Mesh Network Simulator for Frame Aggregation

    TAJIMA Shigeto, FUNABIKI Nobuo, HIGASHINO Teruo

    IEICE technical report. Circuits and systems   113 ( 463 )   103 - 108   2014.3

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    The Wireless Internet-access Mesh NETwork (WIMNET) can provide an inexpensive, flexible, and expandable Internet-access network by connecting multiple access-points (APs) through wireless links. To improve the performance of WIMNET, it is important to adopt high-speed wireless communication protocols IEEE 802.11n/ac that have recently become available, for heavily crowded links between APs. As one of the technologies to enhance the communication speed, the frame aggregation has been introduced so that multiple frames can be sent at the same time to reduce the communication overhead. Because each link between APs usually handles packets to/from multiple hosts in WIMNET, the effect of the frame aggregation can be further enhanced. In this paper, we present a model of the frame aggregation and an extension of the WIMNET simulator based on the model, which has been developed by our group to evaluate the performance of WIMNET. Through simulations in simple topologies, we show the effectiveness of the frame aggregation, and the necessity of the proper number of aggregated frames and the aggregated routing path.

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  • Throughput Measurements Using IEEE 802.11ac Devices for High-Speed Wireless Networks

    CHEW Chang Choon, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report. Circuits and systems   113 ( 463 )   23 - 28   2014.3

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    Recently, IEEE802.11ac communication protocols have been introduced for high-speed wireless networks. Then, commercial devices implementing this protocol have been available from several vendors. In this paper, we provide various TCP throughput measurement results using devices from three vendors implementing this protocol under a set of TCP parameters in various conditions including one or two-hop communications, wall obstacle existences, different link distances, and the use of a repeater. Our measurement results show that TCP throughputs are greatly affected by vendors and communication conditions.

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  • An Implementation of Moblie Anonymous Attribute Authentication System on Android Devices

    IPSJ SIG Notes   2014 ( 45 )   1 - 6   2014.2

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    In current ID-based authentication systems, service providers can collect user's history via user's ID. On the other hand, service providers often want to authenticate user's attributes. To solve this problem, an anonymous attribute authentication system was proposed, where the user's attribtes are autheticated without revealing any information that can speciy the user. In this paper, we implemented a mobile anonymous attribute system using NFC and Bluetooth, where, by bringing the device close to another one, we can perform a direct anonymous attribute authentication. From the experiments on real devices, the execution time of anonymous attribute authentication is 0.98 seconds, and the total processing time including the connection establishment is 1.85 seconds.

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  • A proposal of Web Browser-based Volunteer Computing Platform

    Shogo Takaki, Kan Watanabe, Masaru Fukushi, Noriki Amano, Nobuo Funabiki, Toru Nakanishi

    IPSJ SIG Notes   2014 ( 29 )   1 - 8   2014.2

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    In Volunteer Computing (VC) systems, volunteer participants can contribute their idle computing resources by computing a piece of the computation (job) in their idle time. In existing VC systems, participants must put an extra effort, e.g. installing a dedicated software to their computers and register their personal E-mail addresses, which will be barriers to join as a participant. This paper proposes a web-based VC platform, in which participants can join to VC system by just accessing a specified URL with Web browsers. By using LLVM techniques such as PNaCL, VC jobs become convertible as fast-acting Web applications. As the results of our experiments based on Himeno Benchmark, we show that the performance of PNaCl codes on a web browser is equivalent of native one.

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  • A Web Recipe Conversion Algorithm for Cooking-Step Scheduling

    ZHANG Yijia, FUNABIKI Nobuo, NAKANISHI Toru

    Technical report of IEICE. SS   113 ( 422 )   11 - 16   2014.1

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    Previously, we have proposed the cooking-step scheduling algorithm to assist home-made cooking by busy people such as working persons and students. When a cooking-step schedule of applying the cooking procedures in recipes in a Web site is generated by this algorithm, their conversion into the unique input form to the algorithm is required. In this paper, we propose a Web-recipe conversion algorithm that converts cooking procedures in a recipe into six types of cooking-steps and estimates the corresponding cooking time by extracting keywords in the recipe that correspond to the cooking-step types. We verified the effectiveness of the proposed algorithm through applying it to 100 recipes.

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  • A Clue Function Using Javadoc for Code Writing Problem in Java Programming Learning Assistant System

    NAKAMURA Takuya, FUNABIKI Nobuo, NAKANISHI Toru, AMANO Noriki

    IEICE technical report. Education technology   113 ( 377 )   115 - 120   2014.1

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    Java has been educated in a lot of universities and professional schools due to the reliability, portability, and easy learning. To assist Java educations, our group has developed a Web-based Java Programming Learning Assistant System (JPLAS) that helps students to study Java programming by themselves through automatic testing of Java codes from students using the test-driven development method. Unfortunately, JPLAS is not suitable for less-experienced students in Java because they have to understand test codes that are necessary in automatic testing before writing source codes. In this paper, we propose a Javadoc-based hint function in the code design learning function of JPLAS to let such students learn how to collect the necessary information for a source code from a test code easily. It helps students to understand the whole structure of the source code and complete more accurate code design. We verify the effectiveness of our proposal through applications to 10 students in our laboratory.

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  • Implementation of Anonymous Credential System with Efficient Proofs for Monotone Formulas on Attributes Excluding Restriction

    Shahidatul Sadiah, Toru Nakanishi, Nobuo Funabiki

    2014 SECOND INTERNATIONAL SYMPOSIUM ON COMPUTING AND NETWORKING (CANDAR)   531 - 535   2014

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    An anonymous credential system allows a user to convince a service provider anonymously that he/she owns certified attributes. Previously, we proposed an anonymous credential system to prove user's attributes to satisfy a monotone formula, i.e., a logic relation with any combination of AND/OR relations. However, this system has a restriction that the user can prove the monotone formula when only one attribute is true for any OR relation. Recently, we proposed the improved system to overcome the restriction, by adopting Linear Homonorphic (LH) signature scheme to generate a certificate that contains the minimum attribute set as required in the verification. However, the improved system has never been implemented, and thus the practicality is not evaluated. In this paper, we implement the system using a fast pairing library, and measure the processing times and data sizes, when changing the number of user's attributes and the size of the proved relation.

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  • A Proposal of Routing Algorithm under Practical Conditions for Wireless Internet-Access Mesh Networks

    Nobuo Funabiki, Toru Nakanishi, Wataru Maruyama

    2014 IEEE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS - TAIWAN (ICCE-TW)   27 - 28   2014

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    A Wireless Internet-access Mesh NETwork (WIMNET) can provide an expandable Internet-access network by flexibly adopting multiple Access-Points (APs) that have wireless connections in the field. Previously, we proposed a routing algorithm for generating an optimal routing path between the hosts and one Internet Gateway (GW). However, in practical situations, multiple GWs are usually necessary for scalability. Beside, in the high-speed IEEE802.11ac protocol, the link speed drastically decreases as the distance increases due to the lowered receiving signal quality. Furthermore, commercial APs implementing them have the limitation on the number of hops between a GW and a host. In this paper, we propose a routing algorithm to consider these practical conditions for large-scale WIMNET. We verify the effectiveness through simulating three topologies using the WIMNET simulator.

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  • Extensions of Active Access-Point Selection Algorithm for Wireless Mesh Networks Using IEEE802.11ac Protocol

    Chang Choon Chew, Nobuo Funabiki, Sho Fujita

    2014 SECOND INTERNATIONAL SYMPOSIUM ON COMPUTING AND NETWORKING (CANDAR)   310 - 314   2014

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    A wireless Internet-access mesh network (WIMNET) provides a scalable Internet-access network by flexibly allocating access points (APs) in the field that are connected by wireless links. Previously, we proposed an active AP selection algorithm to select the APs to be activated among the redundantly allocated APs for WIMNET that has a single Internet gateway (GW). However, in practical implementations of large-scale WIMNET, multiple GWs are usually necessary to increase the capacity of Internet connections. Besides, the number of hops between a GW and a host is limited for stable multihop communications, and the transmission speed of a wireless link is dynamically changed by the link condition such as the distance in the high-speed IEEE802.11ac protocol. Furthermore, the minimum throughput should be provided to a host as QoS (Quality of Service) when it is exclusively connected with the GW. In this paper, we propose extensions of the active AP selection algorithm to consider these conditions. We verify the effectiveness of our proposal through simulations in three topologies using the WIMNET simulator.

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  • A Frame Aggregation Extension of Routing Algorithm for Wireless Mesh Networks

    Nobuo Funabiki, Yuuma Tani, Shigeto Tajima

    2014 SECOND INTERNATIONAL SYMPOSIUM ON COMPUTING AND NETWORKING (CANDAR)   238 - 242   2014

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    As a scalable Internet-access network, an Wireless Internet-access Mesh NETwork (WIMNET) consists of multiple wireless access-points (APs) that are connected through wireless links. At least one AP acts as a gateway (GW) to the Internet where any host must reach there through multi-hop communications between APs. To handle large traffics, the latest highspeed IEEE 802.11ac protocol should be adopted for scalable WIMNET, where the routing path determines the performance under its practical implementations using commercial products. Therefore, we have proposed a routing algorithm considering 1) multiple GWs, 2) the link speed change, and 3) the limited number of hops. In this paper, to further improve the performance, we extend the routing algorithm to efficiently consider the frame aggregation in IEEE802.11ac. We verify the effectiveness of our proposal through simulating two topologies using the extended WIMNET simulator.

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  • An extended active access-point selection algorithm for link speed changes in wireless mesh networks

    International Journal Space-Based and Situated Computing   4 ( 3 )   184 - 193   2014

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  • A Proposal of Javadoc Hint Function for Java Programming Learning Assistant System

    Nobuo Funabiki, Takuya Nakamura, Wen-Chung Kao

    2014 IEEE 3RD GLOBAL CONFERENCE ON CONSUMER ELECTRONICS (GCCE)   304 - 308   2014

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    As a reliable, portable, and practical programming language, Java has been educated in many universities and professional schools. To assist Java educations, we have developed a Web-based Java Programming Learning Assistant System (JPLAS) to help students studying Java programming by themselves through automatic testing of Java source codes using the test-driven development (TDD) method. Unfortunately, JPLAS is not suitable for novice students taking basic Java classes, because they need to extract necessary information such as the names of classes and methods from a test code for automatic testing before writing a source code. Previously, we implemented the code design learning function in JPLAS to assist such students. In this paper, we propose a Javadoc hint function in JPLAS to further assist students by showing the detailed information that is automatically generated from the reference code by a teacher for the assignment. We verify the effectiveness of our proposal through an experimental use by 41 students in our department.

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  • An Extension of Access-Point Allocation Algorithm for Adapting Link Speed Change in Wireless Mesh Network

    FARAG Tamer, FUNABIKI Nobuo, HASSAN Walaa

    IEICE technical report   113 ( 360 )   137 - 142   2013.12

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    As an inexpensive, scalable Internet-access wireless network, we have studied design optimizations of the Wireless Internet-access Mesh NETwork (WIMNET). WIMNET uses multiple access-points (APs) that are connected by wireless links. In WIMNET, the proper allocation of APs is essential to ensure the communication quality of hosts and to minimize the installation and management cost. Previously, we have proposed an AP allocation algorithm for WIMNET assuming that every link has a constant speed regardless of the condition. However, our preliminary experiments found that the link speed is greatly affected by the distance and interferences in high-speed IEEE802.11n/ac protocols that have recently become popular. In this paper, we propose an extension of our AP allocation algorithm to adapt to this link speed change where the maximum link distance between two APs that has been fixed in the previous algorithm is optimized to provide the highest performance. We verify the effectiveness of our extended algorithm through simulations in simple topology instances using the WIMNET simulator.

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  • A Proposal of Routing Tree Algorithm for Scalable Wireless Mesh Networks Under Practical Conditions

    MARUYAMA Wataru, FUNABIKI Nobuo, NAKANISHI Toru

    Technical report of IEICE. RCS   113 ( 361 )   249 - 254   2013.12

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    As a flexible cost-efficient Internet access network, we have studied the Wireless Internet-access Mesh NETwork (WIMNET) that is composed of multiple access points (APs) connected through wireless links. We have proposed a routing tree algorithm to find a routing path between one Internet gateway (GW) and the hosts. However, normally, several GWs exist in practical implementations of WIMNET. The number of hops between a GW and a host is limited for commercial APs. Furthermore, the communication speed is dynamically changed by the link distance for the new high-speed communication protocol IEEE802.11ac. In this study, we propose a new routing tree algorithm considering these conditions for WIMNET. We verify the effectiveness of our proposal through simulating two instances using the WIMNET simulator.

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  • An Extension of Access-Point Allocation Algorithm for Adapting Link Speed Change in Wireless Mesh Network

    FARAG Tamer, FUNABIKI Nobuo, HASSAN Walaa

    Technical report of IEICE. RCS   113 ( 361 )   255 - 260   2013.12

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    As an inexpensive, scalable Internet-access wireless network, we have studied design optimizations of the Wireless Internet-access Mesh NETwork (WIMNET). WIMNET uses multiple access-points (APs) that are connected by wireless links. In WIMNET, the proper allocation of APs is essential to ensure the communication quality of hosts and to minimize the installation and management cost. Previously, we have proposed an AP allocation algorithm for WIMNET assuming that every link has a constant speed regardless of the condition. However, our preliminary experiments found that the link speed is greatly affected by the distance and interferences in high-speed IEEE802.11n/ac protocols that have recently become popular. In this paper, we propose an extension of our AP allocation algorithm to adapt to this link speed change where the maximum link distance between two APs that has been fixed in the previous algorithm is optimized to provide the highest performance. We verify the effectiveness of our extended algorithm through simulations in simple topology instances using the WIMNET simulator.

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  • Evaluation and Improvement of Credibility-based Voting for Volunteer Computing Systems with Dynamic Error Rate

    2013 ( 26 )   1 - 8   2013.12

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  • An Implementation of Volunteer Computing System with Credibility-based voting

    2013 ( 19 )   1 - 7   2013.12

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  • Efficient Proofs for CNF Formulas on Attributes in Pairing-Based Anonymous Credential System

    Nasima Begum, Toru Nakanishi, Nobuo Funabiki

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E96A ( 12 )   2422 - 2433   2013.12

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    To enhance user privacy, anonymous credential systems allow the user to convince a verifier of the possession of a certificate issued by the issuing authority anonymously. In the systems, the user can prove relations on his/her attributes embedded into the certificate. Previously, a pairing-based anonymous credential system with constant-size proofs in the number of attributes of the user was proposed. This system supports the proofs of the inner product relations on attributes, and thus can handle the complex logical relations on attributes as the CNF and DNF formulas. However this system suffers from the computational cost: The proof generation needs exponentiations depending on the number of the literals in OR relations. In this paper, we propose a pairing-based anonymous credential system with the constant-size proofs for CNF formulas and the more efficient proof generation. In the proposed system, the proof generation needs only multiplications depending on the number of literals, and thus it is more efficient than the previously proposed system. The key of our construction is to use an extended accumulator, by which we can verify that multiple attributes are included in multiple sets, all at once. This leads to the verification of CNF formulas on attributes. Since the accumulator is mainly calculated by multiplications, we achieve the better computational costs.

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  • A Proposal of Extended Anonymous Credential Scheme with Efficient Proof of Age Inequality (Information Security)

    SADIAH Shahidatul, NAKANISHI Toru, WATANABE Kan, FUNABIKI Nobuo

    Technical report of IEICE. ISEC   113 ( 217 )   21 - 28   2013.9

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    An anonymous credential system on attributes allows a user to convince a service provider anonymously that he/she owns a certified attribute. Previously, an anonymous credential system to prove that user attributes satisfy a CNF formula on attributes was proposed. However, the system needs a large public key (PK) size and thus the large computation times, when proving the age in equation using the birthday attribute, because each birthday is assigned to one attribute and each attribute is mapped to one public parameter. In this paper, to reduce the PK size and computation times, we use the idea of dividing the birthday (year/month/day) attribute into the year, the month, and the day attributes. Consequently, the PK size is decreased, since the number of attributes is reduced to approximately 0.3%. In case of proving the age in equation, these attributes have to be expressed using monotone logic formulas. To adopt this idea on previous system, we extend the accumulator in the previous system and we propose an anonymous credential system to prove monotonic formulas. Also, we show the effectiveness of proposed system by measuring the process times for the implementation.

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  • A Clustering Algorithm Considering Link Speed for Wireless Mesh Networks

    TAJIMA Shigeto, FUNABIKI Nobuo, HIGASHINO Teruo

    IEICE technical report   113 ( 129 )   155 - 160   2013.7

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    A Wireless Internet-access Mesh Network (WIMNET) can provide a scalable Internet-access network by using multiple access point (APs) connected through wireless communications. In previous studies, we proposed a clustering algorithm for efficiently composing large scale WIMNET by partitioning the APs into a set of clusters. For this algorithm, we assume that any link has a constant speed, although our preliminary experiments found that the link speed is greatly changed by the link distance and interferences for the new high-speed IEEE802.11n protocol that has recently become popular. In this paper, we extend the clustering algorithm in considering the link speed change for effectively introducing IEEE802.11n to WIMNET. We verify the effectiveness of our proposal through simulations in grid topology instances using the WIMNET simulator.

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  • A Fixed Backoff-Time Switching Method for CSMA/CA Protocol in Wireless Mesh Networks

    Sritrusta Sukaridhoto, Nobuo Funabiki, Toru Nakanishi, Kan Watanabe, Shigeto Tajima

    IEICE TRANSACTIONS ON COMMUNICATIONS   E96B ( 4 )   1019 - 1029   2013.4

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    As a flexible and cost-efficient scalable Internet access network, we studied architectures, protocols, and design optimizations of the Wireless Internet-access Mesh NETwork (WIMNET). WIMNET is composed of multiple access points (APs) connected through multihop wireless communications on IEEE 802.11 standards. The increasing popularity of real-time applications such as IF-phones and IP-TV means that they should be supported in WIMNET. However, the contention resolution mechanism using a random backoff-time in the CSMA/CA protocol of 802.11 standards is not sufficient for handling real-time traffic in multihop wireless communications. In this paper, we propose a Fixed Backoff-time Switching (FBS) method for the CSMA/CA protocol to improve the real-time traffic performance in WIMNET by giving the necessary activation chances to each link. We implement our proposal on the QualNet simulator, and verify its effectiveness through simulations on three network topologies with four scenarios.

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  • BS-1-26 A Design for OpenFlow lmplementation of Fixed Backoff-time Switching Method in Wireless Mesh Networks

    Sukaridhoto Sritrusta, Funabiki Nobuo, Nakanishi Toru, Watanabe Kan

    Proceedings of the IEICE General Conference   2013 ( 2 )   "S - 50"-"S-51"   2013.3

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  • D-9-27 AN EXPERIMENTAL EVALUATION OF COOKING-STEP SCHEDULING ALGORITHM IN COOKING FOUR DISHES

    Matsushima Yukiko, Okada Tomoya, Funabiki Nobuo, Nakanishi Toru, Watanabe Kan

    Proceedings of the IEICE General Conference   2013 ( 1 )   125 - 125   2013.3

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  • BS-1-2 AN IMPROVED HOST ASSOCIATION OPTIMIZATION STAGE IN ACCESS-POINT AGGREGATION ALGORITHM FOR WIRELESS LOCAL AREA NETWORKS

    Islam Ezharul, Funabiki Nobuo, Nakanishi Toru, Watanabe Kan

    Proceedings of the IEICE General Conference   2013 ( 2 )   "S - 3"-"S-4"   2013.3

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  • D-9-7 A Proposal of Web-based Receipt Information Management System

    na Ta, Funabiki Nobuo, Nakanishi Toru, Watanabe Kan

    Proceedings of the IEICE General Conference   2013 ( 1 )   105 - 105   2013.3

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  • An Extension of Routing Tree Algorithm Considering Link Speed Change for Wireless Mesh Networks

    MARUYAMA Wataru, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan

    IEICE technical report   112 ( 392 )   1 - 6   2013.1

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    As a flexible inexpensive Internet-access network, we have studied the Wireless Internet-access Mesh NETwork (WIMNET) that is composed of wirelessly interconnected Access-Points (APs). Previously, we proposed the routing tree algorithm to generate a routing path connecting the APs in WIMNET such that the performance can improved by reducing congestions at links around the Internet Gate Way (GW). For this algorithm, we assume that every link has the same constant speed to transmit data packets regardless of its distance However, when we adopt the new high-speed IEEE802. 11n protocol for wireless communications, our preliminary experiments found that the speed decreases drastically as the distance increases. In this paper, we extend the routing tree algorithm in order to consider the link speed change and generate the routing path to the hosts. We show the effectiveness of this extension through simulations in three instances.

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  • An Extension of Active Access Point Selection Algorithm for Wireless Mesh Networks

    FUJITA Sho, FUNABIKI Nobuo, NAKANISHI Tom, WATANABE Kan

    IEICE technical report   112 ( 392 )   19 - 24   2013.1

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    The wireless Internet-access mesh network (WIMNET) has been studied to realize an inexpensive, scalable Inter-net-access network by using multiple access points (APs) connected by wireless links. WIMNET can improve the dependability to failures of links and APs by allocating APs redundantly. Since redundant APs may cause the increase of the operational cost and the degradation of the throughput due to increasing radio interferences, we have proposed the active AP selection algorithm for selecting functioning APs for communications. In this algorithm, we assume that every link speed is constant for simplicity, although our preliminary expenments found that the link speed greatly is affected by the distance in the new high-speed IEEE802.11 n protocol that has recently become popular. In this paper, we extend the active AP selection algonthm in considering this link speed change. We verify the effectiveness of our proposal through simulations in four instances using the WIMNET simulator.

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  • An Extension of Access-Point Aggregation Algorithm Considering Link Speed Change for Wireless Local Area Networks

    ISLAM Md. EZHARUL, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan

    IEICE technical report   112 ( 392 )   7 - 12   2013.1

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    These days, multiple wireless local area networks (WLANs) have been often deployed in the same building of a university or a company. In those WLANs, access points (APs) are usually managed independently by different groups such as laboratories or departments. Then, a host can detect signals from multiple APs, which may degrade the communication performance due to their interferences and increase the operational cost Previously, we have proposed an AP aggregation algorithm to minimize the number of active APs in the field by aggregating them using the virtual AP technology. Recently, the IEEE802. 11n protocol has become popular as a high-speed communication protocol for WLANs However, our preliminary experiments using this protocol found that the link speed drastically decreases as its distance increases. In this paper, we extend our AP aggregation algorithm to considering this speed change so that any host can ensure the minimum speed with an AP while maximizing the overall throughput of the network. We verify the effectiveness of our extension through simulations in a network scenario using the WIMNET simulator.

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  • Database Design and Input Data Processing Algorithm for Receipt Information System

    Tana, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan

    IEICE technical report. Life intelligence and office information systems   112 ( 379 )   85 - 90   2013.1

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    Recently, due to the lasting economic depression, an economical life has been desired for many people. For their assistance, our group is developing a Web-based receipt information system to help keeping household accounts to grasp daily expenses, and sharing latest information of selling products at nearby shops to buy products as inexpensively as possible. In this paper, we present the database design for this system, and propose the input data processing algorithm composed of the functions for 1) product name corrections, 2) discount price corrections, and 3) category classifications, to solve problems in the character recognition software on receipts adopted in this system. Our preliminary experiments found that this software often falsely recognizes product names, cannot correct discount prices, and cannot automatically classify categories of products. We implemented the proposed algorithm as a Java application, and applied it to 113 products from 12 receipts where every product was correctly processed.

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  • An Android Application of Cooking Guidance Function in Homemade Cooking Assistance System

    OKADA Tomoya, MATSUSHIMA Yukiko, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan

    IEICE technical report. Information and communication management   112 ( 378 )   91 - 96   2013.1

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    In order to assist economical and healthy lives with homemade cooking, our group has developed a Web-based HOmemade Cooking Assistance System (HOCAS) Previously, we have implemented the menu planning function and the cooking-step scheduling function at the server, so that busy persons such as working people, students, and nurturing families can make menus and cooking-step schedules for one week including bulk cooking in weekends. In this paper, we implement the cooking guidance function as an Android application of cooking guidance. Using outputs of the existing functions, it provides the three functions for the menu indication, the cooking guidance, and the cooking time measurement. For experimental evaluations, we cooked four dishes by following the guidance from the system, and confirmed its effectiveness. Through comparing cooking times between expected and measured ones, we analyzed its problems and discussed future works.

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  • An Android Application of Cooking Guidance Function in Homemade Cooking Assistance System

    OKADA Tomoya, MATSUSHIMA Yukiko, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan

    IEICE technical report. Life intelligence and office information systems   112 ( 379 )   91 - 96   2013.1

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    In order to assist economical and healthy lives with homemade cooking, our group has developed a Web-based HOmemade Cooking Assistance System (HOCAS) Previously, we have implemented the menu planning function and the cooking-step scheduling function at the server, so that busy persons such as working people, students, and nurturing families can make menus and cooking-step schedules for one week including bulk cooking in weekends. In this paper, we implement the cooking guidance function as an Android application of cooking guidance. Using outputs of the existing functions, it provides the three functions for the menu indication, the cooking guidance, and the cooking time measurement. For experimental evaluations, we cooked four dishes by following the guidance from the system, and confirmed its effectiveness. Through comparing cooking times between expected and measured ones, we analyzed its problems and discussed future works.

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  • An Extension of Fill-in-the-blank Problem Function in Java Programming Learning Assistant System and Its Application to Classes

    KORENAGA Yousuke, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan, AMANO Noriki

    IEICE technical report. Education technology   112 ( 374 )   63 - 68   2013.1

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    Nowadays, a programming language Java has been educated in many universities and professional schools To assist its self-studies by students, we have developed a Web-based Java Programming Learning Assis-tant System (JPLAS) In this work, we extend the fill-in-the-blank problem functcon in JPLAS, so that this function can select variables and grammar symbols into problems in addition to conventional reserved words This function can automatically generate fill-in-the-blank problems by randomly blanking symbols in a sample Java code that correspond to the words specified by a teacher, where the constraints for unique answers are observed For evalu-ations of this function, we applied it to students in a Java programming course in our department after preparing 100 problems with various levels using JPLAS Then, we assigned them a quiz of the related problems to verify the learning effect The result shows that those who solved more problems in JPLAS could obtain better scores in the quiz

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  • A Java programming learning assistant system using test-driven development method

    Nobuo Funabiki, Yukiko Matsushima, Toru Nakanishi, Kan Watanabe, Noriki Amano

    IAENG International Journal of Computer Science   40 ( 1 )   38 - 46   2013

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  • An Extension of Access-Point Aggregation Algorithm to Ensure Minimum Host Throughput for Wireless Local Area Networks

    Md. Ezharul Islam, Nobuo Funabiki, Toru Nakanishi, Kan Watanabe

    2013 FIRST INTERNATIONAL SYMPOSIUM ON COMPUTING AND NETWORKING (CANDAR)   141 - 147   2013

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    Recently, many organizations such as universities and companies are deploying multiple wireless local area networks (WLANs) even in the same building. In these WLANs, wireless access-points (APs) are usually managed independently by different groups such as laboratories or departments. In this overlapped WLAN environment, a host can detect signals from multiple APs, which may degrade the communication performance due to their interferences and increase the operational cost. To solve this problem, previously, we have proposed the AP aggregation algorithm to minimize the number of active APs in the field by aggregating them using the virtual AP technology. However, the minimization of active APs may excessively degrade the performance of WLANs, where more active APs can usually increase it. In this paper, we propose an extension of the AP aggregation algorithm to ensure the minimum average throughput for each host in the field. This average throughput is estimated using the cost function defined in the algorithm, and the number of active APs is increased when it does not reach the given threshold. We verify the effectiveness of this extension through extensive simulations in two network instances using the WIMNET simulator.

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  • An improvement of graph-based fill-in-blank problem generation algorithm in Java programming learning assistant system

    Tana, Nobuo Funabiki, Toru Nakanishi, Noriki Amano

    International Workshop on ICT   1 - 4   2013

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  • A cooking guidance function on Android tablet for Homemade Cooking Assistance System

    Yukiko Matsushima, Nobuo Funabiki, Tomoya Okada, Toru Nakanishi, Kan Watanabe

    2013 IEEE Region 10 Humanitarian Technology Conference, R10-HTC 2013   249 - 254   2013

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    To assist busy people such as working persons, students, and nurturing families to have economical and healthy lives with homemade cooking, we have proposed a Web-based HOmemade Cooking Assistance System (HOCAS). Previously, we implemented the menu planning function and the cooking-step scheduling function at the server using JSP/Servlet, so that a user can plan a menu for the whole week and make a cooking-step schedule to efficiently cook multiple dishes at the same time. Unfortunately, a user needs to refer the next cooking-step on a paper during cooking process, which is actually not easy at critical timing in a kitchen, because the schedule is output as a PDF file. In this paper, we propose a cooking guidance function on an Android tablet as a Java application to navigate cooking-steps through touch panel operations. We confirmed the effectiveness by experimentally cooking four dishes using this function. © 2013 IEEE.

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  • An extension of fill-in-the-blank problem function in Java programming learning assistant system

    Nobuo Funabiki, Yousuke Korenaga, Toru Nakanishi, Kan Watanabe

    2013 IEEE Region 10 Humanitarian Technology Conference, R10-HTC 2013   85 - 90   2013

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    Nowadays Java has been educated in many universities and professional schools as a reliable, portable, and practical programming language. To assist self-studies by students, we have developed a Web-based Java Programming Learning Assistant System (JPLAS). JPLAS has the two main functions of code writing problem and fill-in-the-blank problem to support studies at different levels. The former function intends that a student can write a whole code from scratch, where the submitted code is automatically tested on the server using the test-driven development (TDD) method. The latter function intends that a novice student can study Java reserved words, where a problem is generated by randomly removing the specified ones from a selected sample code and the removed one becomes the correct answer to each blank. In this paper, we extend this latter function for removing more general elements including variables and control symbols in problems. We analyze the conditions for selecting blanked elements with unique correct answers. For evaluations, we generated 100 problems with various levels using the extended function, and assigned them to students in the Java programming course in our department. Then, we gave a short test and a questionnaire with nine questions, where we found that students solving more problems achieved better scores in general, and their opinions support the effectiveness of our proposal. © 2013 IEEE.

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  • A Modified Active Access-Point Selection Algorithm Considering Link Speed Change in IEEE 802.11n for Wireless Mesh Networks

    Nobuo Funabiki, Sho Fujita, Toru Nakanishi, Kan Watanabe

    2013 SEVENTH INTERNATIONAL CONFERENCE ON COMPLEX, INTELLIGENT, AND SOFTWARE INTENSIVE SYSTEMS (CISIS)   714 - 719   2013

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    As an inexpensive, scalable Internet-access wireless network, we have studied the architecture, protocols, and design optimizations of the wireless Internet-access mesh network (WIMNET) that uses multiple access-points (APs) connected by wireless links. WIMNET can improve the dependability to failures of links and/or APs by allocating APs redundantly in the network field. Because redundant APs can increase the operational cost and degrade the performance due to increasing radio interferences, only the necessary APs for connections between the hosts and the Internet gateway should be activated at communications. Previously, we have defined the active AP selection problem of selecting the minimum number of active APs, and proposed its heuristic algorithm, assuming that every link has the same constant speed for simplicity. However, our preliminary experiments found that the link speed is greatly affected by the distance in the high-speed IEEE802.11n protocol that has recently become popular. In this paper, we propose a modification of the active AP selection algorithm to consider the link speed change, where we introduce a new design parameter for WIMNET to select links that have sufficient throughputs. We verify the effectiveness of our modified algorithm through simulations in four instances using the WIMNET simulator.

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  • A Modified Routing Tree Algorithm Considering Link Speed Change in IEEE 802.11n for Wireless Mesh Network

    Nobuo Funabiki, Toru Nakanishi, Kan Watanabe, Wataru Maruyama

    2013 IEEE 17TH INTERNATIONAL SYMPOSIUM ON CONSUMER ELECTRONICS (ISCE)   29 - 30   2013

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    A Wireless Internet-access Mesh NETwork (WIMNET) can provide an expandable Internet-access network by adopting multiple Access-Points (APs) that have wireless connections with each other. Previously, we proposed a routing tree algorithm for generating an optimal routing path between the APs and the Internet Gate Way (GW) with a minimal transmission delay, assuming that every link has the same data transmission speed. However, our preliminary experiments found that the link speed using the IEEE802.11n as a new high-speed protocol for wireless communications, decreases drastically as the distance increases due to the lowered receiving signal quality. In this paper, we propose a modified routing tree algorithm to consider the large speed change in order to adopt the IEEE 802.11n in WIMNET effectively. In addition to links between APs, our modified algorithm selects the links between hosts and their associated APs. We verify the effectiveness of the modified algorithm through simulations in three topologies.

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  • Reducing public-key size in an anonymous credential system for CNF formulas with constant-size proofs

    Nasima Begum, Toru Nakanishi, Nobuo Funabiki

    2013 IEEE 2nd Global Conference on Consumer Electronics, GCCE 2013   530 - 533   2013

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    To enhance the user privacy at authentications, an anonymous credential system has been designed to allow a user to anonymously convince a verifier of the possession of a certificate issued by the issuing authority. In this system, a user can prove relations on his/her attributes embedded into the certificate. Previously, we have proposed an anonymous credential system with constant-size proofs and faster proof generations for CNF formulas than the existing system. In the system, in the verification, some value should be included in some set Φ. Unfortunately, this system has a problem of requiring long public parameters that is proportional to the size of the set Φ. In this paper, we propose an extension to reduce the public key by separating this set Φ into two sets Φ1 and Φ2 with logarithmic sizes such that u1 Φ1 and u2 Φ2 if and only if u1 +u2 Φ. Furthermore, we evaluate the efficiency based on the implementation. © 2013 IEEE.

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  • An extension of clustering algorithm for considering link speed in wireless mesh networks

    Shigeto Tajima, Nobuo Funabiki, Teruo Higashino

    2013 IEEE 2nd Global Conference on Consumer Electronics, GCCE 2013   500 - 504   2013

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    As a scalable Internet-access network, we have studied Wireless Internet-access Mesh Network (WIMNET) using multiple access point (APs) that are connected through wireless communications. In previous studies, we proposed a clustering algorithm for efficiently composing a large scale WIMNET by partitioning the APs into a set of clusters. This algorithm assumes that any link speed is constant for simplicity, whereas our preliminary experiments found that it is greatly changed as the link distance increases due to interferences when adopting the new high-speed IEEE802.11n protocol. In this paper, we extend our clustering algorithm to consider this link speed change to introduce IEEE802.11n into WIMNET. We verify the effectiveness of the extended algorithm through simulations in a grid topology instance using the WIMNET simulator. © 2013 IEEE.

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  • Extensions of cooking guidance function on Android tablet for homemade cooking assistance system

    Yukiko Matsushima, Nobuo Funabiki, Yijia Zhang, Toru Nakanishi, Kan Watanabe

    2013 IEEE 2nd Global Conference on Consumer Electronics, GCCE 2013   397 - 401   2013

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    Previously, we proposed a cooking-step scheduling algorithm to find a schedule of applying the cooking steps in the recipes for efficiently cooking multiple dishes simultaneously, to help healthy and cost-efficient lives for busy person. Then, we implemented a cooking guidance function on an Android tablet to navigate the cooking schedule in a kitchen. Although we confirmed the effectiveness through cooking experiments, we found three problems: 1) a user may click a starting button even if the previous required steps are not completed, 2) a user may miss the proper timing to stop a cooking-step, and 3) the duration time for a cooking-step may be varied by a user skill or a dish nature. In this paper, we extend the cooking guidance function by adding three features of starting condition checking, time-up alarming, and cooking rescheduling to solve these problems. We verify the effectiveness of the extended guidance function through experimentally cooking four dishes. © 2013 IEEE.

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  • An extension of menu planning algorithm for two-phase homemade cooking

    Nobuo Funabiki, Yukiko Matsushima, Toru Nakanishi, Kan Watanabe

    2013 IEEE 2nd Global Conference on Consumer Electronics, GCCE 2013   352 - 356   2013

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    Nowadays, many people keep busy lives due to working in companies, studying in schools, or taking care of children or senior parents. As a result, it has become very hard for them to cook foods for suppers by themselves at home after long-hour duties at daytime in weekdays. Previously, to assist homemade cooking of such busy people, we proposed a two-phase cooking such that the preparation phase of cooking foods that they will eat on the following weekdays is performed on a weekend, and the finishing phase for the foods for a supper is completed on the day in short time. Then, we presented a menu planning algorithm to assist generating one-week menus for this two-phase cooking. Unfortunately, we found that this algorithm has the following drawbacks in practical use: 1) the selection of food preference is not easy, 2) the use of preferred ingredients for cooking cannot be directly specified, and 3) the nutrition balance of foods in a menu is not considered. In this paper, we extend this algorithm to solve them by newly defining a preference index and the food balance guide by Japanese government. We verify the effectiveness of the extended algorithm through generating five-day menus from 241 food candidates. © 2013 IEEE.

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  • A graph-based algorithm for fill-in-blank problem generation in Java programming learning assistant system

    Nobuo Funabiki, Tana, Toru Nakanishi, Kan Watanabe

    The 3rd International Conference on Applied and Theoretical Information Systems Research (ATISR2013)   2013

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  • A fixed backoff-time switching method for wireless mesh networks: Design and Linux implementation

    Sritrusta Sukaridhoto, Nobuo Funabiki, Dadet Pramudihanto, Zainal Arief

    Proceedings - 2013 International Conference on Information Technology and Electrical Engineering: "Intelligent and Green Technologies for Sustainable Development", ICITEE 2013   248 - 253   2013

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    As a flexible and cost-efficient scalable Internet access network, we have studied architectures, protocols, and design optimizations of the Wireless Internet-Access Mesh NETwork (WIMNET). WIMNET is composed of wirelessly connected access points (APs), where any host can basically access to the Internet through multihop communications between APs with IEEE 802.11 standard. In WIMNET, undesirable situations can often happen such that some links dominate the bandwidth while others become insufficient due to the limited shared bandwidth. However, the contention resolution mechanism using a random backoff-time in the CSMA/CA protocol of 802.11 standards is not sufficient for handling real-time traffic in multihop wireless communications. Previously, we have proposed the concept of the CSMA-based Fixed Backoff time Switching (CSMA-FBS) method for WIMNET to improve the performance by giving necessary link activation chances for multi-hop communications. We implemented our proposal on the QualNet simulator, and verify its effectiveness through simulations. In this paper, we present an implementation of the FBS method in Linux kernel to show its practicality and investigate the performance in a real network. Our design consists of implementations or modifications of the five programs: Kernel configuration, Debugfs, Minstrel, iw, and FBSdaemon. © 2013 IEEE.

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  • An access-point aggregation approach for energy-saving wireless local area networks

    Md. Ezharul Islam, Nobuo Funabiki, Toru Nakanishi, Kan Watanabe

    IEICE Transactions on Communications   E96-B ( 12 )   2986 - 2997   2013

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    Nowadays, with spreads of inexpensive small communication devices, a number of wireless local area networks (WLANs) have been deployed even in the same building for the Internet access services. Their wireless access-points (APs) are often independently installed and managed by different groups such as departments or laboratories in a university or a company. Then, a user host can access to multiple WLANs by detecting signals from their APs, which increases the energy consumption and the operational cost. It may also degrade the communication performance by increasing interferences. In this paper, we present an AP aggregation approach to solve these problems in multiple WLAN environments by aggregating deployed APs of different groups into limited ones using virtual APs. First, we formulate the AP aggregation problem as a combinatorial optimization problem and prove the NP-completeness of its decision problem. Then, we propose its heuristic algorithm composed of five phases. We verify the effectiveness through extensive simulations using the WIMNET simulator. Copyright © 2013 The Institute of Electronics, Information and Communication Engineers.

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  • An Extension of Credibility Formula in Desktop Grid to Different Workers' Performance

    2012 ( 16 )   1 - 8   2012.12

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  • A Web Service Implementation of ◆ Attribute Authentication

    HAMADA Yuji, NAKANISHI Toru, WATANABE Kan, FUNABIKI Nobuo

    IEICE technical report. Life intelligence and office information systems   112 ( 306 )   41 - 46   2012.11

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    Our research group has proposed the anonymous authentication scheme using user's attributes. In this scheme, the user can anonymously convince a verifier of the possession of attributes specified by the service provider with the complexity independent of the number of attributes. Previously, we have implemented Web system where the user proves the AND relations to a verifier. However, we cannot prove CNF fomulas that is the conbination of AND and OR relations at our Web system. In this study, we implemented the anonymous attributes authentication system for CNF fomulas using proxies and a questionnaire service as a Web service. We measured the communication times including the authentication times. The results show that our system is sufficiently practical.

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  • An Implementation of Anonymous Attributes Authentication System on Android Smart Phone

    2012 ( 3 )   146 - 152   2012.10

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  • An Implementation of Reputation System with Secrecy Even for Administrators

    2012 ( 3 )   828 - 834   2012.10

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  • An Extension of Wireless Internet-Access Mesh Network Simulator for Smart Antenna Use and Evaluations Using Simple Topologies

    TAJIMA Shigeto, FUNABIKI Nobuo, HIGASHINO Teruo

    IEICE technical report   112 ( 231 )   125 - 130   2012.10

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    As an inexpensive, flexible, and scalable Internet-access network, we have studied architecture, protocols, and design optimizations of the Wireless Internet-access Mesh NETwork (WIMNET). WIMNET consists of multiple access-points (APs) as wireless routers that are connected through wireless links. To improve the performance by realizing high-speed and simultaneous plural link communications, we have considered use of the smart antenna as a generalized technology of the Multiple-Input-Multiple-Output (MIMO) channel and the Adaptive Array Antenna (AAA). In this paper, we present an extension of the WIMNET simulator for the smart antenna use, which has been developed by our group to estimate the throughput in WIMNET. Through simulations in simple topologies, we investigate impacts of two smart antenna use methods and of interval changes between adjacent nodes including APs and hosts, into the performance of WIMNET.

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  • An Implementation of Code Design Learning Function in Java Programming Learning Assistant System

    NAKAMURA Takuya, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan, AMANO Noriki

    IEICE technical report. Education technology   112 ( 224 )   17 - 22   2012.9

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    Java has been educated in a lot of universities and professional schools due to the reliability, portability, and easy learning. To assist Java educations, our group has developed a Web-based Java Programming Learning Assistant System (JPLAS) that helps students to study Java programming by themselves through automatic testing of Java codes from students using the test-driven development method. Unfortunately, JPLAS is not suitable for less-experienced students in Java because they have to understand test codes that are necessary in automatic testing before writing source codes. In this paper, we propose a code design learning function in JPLAS to let such students learn how to collect the necessary information for a source code from a test code. A code design result from a student is automatically verified through comparisons with the corresponding model answer from a teacher. We verify the effectiveness of our proposal through applications to 24 students in our department.

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  • A Linux Implementation Design of Fixed Backoff-time Switching Method for Wireless Mesh Networks

    SUKARIDHOTO Sritrusta, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan, Shigeto TAJIMA

    IEICE technical report   112 ( 208 )   83 - 88   2012.9

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    As a flexible and cost-efficient scalable Intenet access network, we have studied architectures, protocols, and design optimizations of the Wireless Internet-access Mesh NETwork (WIMNET). WIMNET is composed of wirelessly connected access points(APs), where any host can basically access to the Internet through multihop communications between APs.In WIMNET, undesirable situations can often happen such that some links dominate the bandwidth while others become insufficient due to the limited shared bandwidth. To improve the performance by avoiding them, controls of activation chances for wireless links depending on their traffics are effective. Thus, previously, we have proposed the Fixed Backoff-time Switching (FBS) method for the CSMA/CA protocol, and verified the effectiveness using the QualNet simulator. In this paper, we present an implementation design of the FBS method in Linux kemel to show its practicality and investigate the performance in a real network. Our design consists of implementations or modifications of the five programs:Kernel configuration, Debugfs,Minstrel,iw, and FBSdaemon.

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  • BS-5-29 An Idea of Linux Implementation of Fixed Backoff-time Switching Method for Wireless Mesh Networks(BS-5. Network and Service Design, Control and Management)

    Sukaridhoto Sritrusta, Funabiki Nobuo, Nakanishi Toru, Watanabe Kan, Tajima Shigeto

    Proceedings of the Society Conference of IEICE   2012 ( 2 )   "S - 82"-"S-83"   2012.8

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    As a flexible and cost-efficient scalable Internet access network, we have studied architectures,protocols, and design optimizations of the Wireless Internet-access Mesh NETwork (WIMNET). WIMNET is composed of wireless connected access points. Previously, we proposed the Fixed Backoff-time Switching (FBS) method for the CSMA/CA protocol to improve the real-time traffic performance in WIMNET by giving the necessary activation chances to each link, and verified the effectiveness using the QualNet simulator. In this paper, we present an idea of the FBS method implementation at Linux kernel after quickly reviewing it.

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  • An Extension of Cooking-Step Scheduling Algorithm for Simultaneous Cooking of Multiple Dishes

    MATSUSHIMA Yukiko, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan

    IEICE technical report. Image engineering   112 ( 189 )   1 - 6   2012.8

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    To assist homemade cooking of busy persons such as working people and child-growing families, we have proposed a cooking-step scheduling algorithm for multiple dishes. By composing the cooking procedure for each dish as a sequence of cooking-steps, this algorithm generates an optimal schedule of the cooking-steps for multiple dishes to minimize the cooking time while considering the constraints of cooks and instruments as a cooking model. In this paper, to enhance the practicality, we extend the algorithm in 1) accommodating the continuous cooking-steps such as boiling ingredients soon after stirring for a dish cooked by boiling or stewing, 2) suggesting the clearance chance of used instruments at a long waiting time, 3) preferentially assigning any possible cooking-step of the preferred dish to the sub-cook, and 4) considering the skill level of a cook in the operating time of a cooking-step. Through simulations and cooking experiments using five dishes, we verify the effectiveness of our algorithm extensions.

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  • An Extension of Cooking-Step Scheduling Algorithm for Simultaneous Cooking of Multiple Dishes

    MATSUSHIMA Yukiko, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan

    IEICE technical report. Life intelligence and office information systems   112 ( 188 )   1 - 6   2012.8

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    To assist homemade cooking of busy persons such as working people and child-growing families, we have proposed a cooking-step scheduling algorithm for multiple dishes. By composing the cooking procedure for each dish as a sequence of cooking-steps, this algorithm generates an optimal schedule of the cooking-steps for multiple dishes to minimize the cooking time while considering the constraints of cooks and instruments as a cooking model. In this paper, to enhance the practicality, we extend the algorithm in 1) accommodating the continuous cooking-steps such as boiling ingredients soon after stirring for a dish cooked by boiling or stewing, 2) suggesting the clearance chance of used instruments at a long waiting time, 3) preferentially assigning any possible cooking-step of the preferred dish to the sub-cook, and 4) considering the skill level of a cook in the operating time of a cooking-step. Through simulations and cooking experiments using five dishes, we verify the effectiveness of our algorithm extensions.

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  • A Pairing-Based Anonymous Credential System with Efficient Attribute Proofs

    Amang Sudarsono, Toru Nakanishi, Nobuo Funabiki

    53 ( 6 )   11p   2012.6

  • A Generalization of WDS Clustering Algorithm Extension to Smart-Antenna in Wireless Mesh Networks

    TAJIMA Shigeto, FUNABIKI Nobuo, TOMISATO Shigeru, HATA Masaharu, HIGASHINO Teruo

    IEICE technical report   112 ( 8 )   37 - 42   2012.4

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    As a scalable inexpensive Internet-access network, we have studied the Wireless Internet-access Mesh Network (WIMNET) that is composed of multiple access point (APs) connected through the Wireless Distribution System (WDS). Because all the traffics pass through an Internet gateway (GW) in WIMNET, the resolution of link congestions around the GW is very important. For this problem, we have proposed a WDS clustering algorithm to partition the APs into a set of WDS clusters where the APs in each cluster shares an GW, and have considered the adoption of a smart antenna for a Smart AP (SAP). Since the smart antenna is usually expensive, we have extended the WDS clustering algorithm to a cluster where only one or two SAPs are used. In this paper, we generalize this extension to a cluster with an arbitrary number of SAPs. Besides, we investigate the priority action of the smart antenna for multiple SAPs in one cluster. We evaluate the effectiveness through simulations using grid topology instances.

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  • BS-3-17 LOAD BALANCING STAGE FOR AN ACCESS-POINT AGGREGATION ALGORITHM IN WIRELESS LOCAL AREA NETWORKS(BS-3. Management and Control Technologies for Innovative Networks)

    Islam Md. Ezharul, Funabiki Nobuo, Nakanishi Toru, Watanabe Kan

    Proceedings of the IEICE General Conference   2012 ( 2 )   "S - 33"-"S-34"   2012.3

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    Currently, many organizations such as universities and companies are using multiple wireless local area networks (WLANs) even in the same building, where wireless access-points (APs) are independently managed by different groups such as departments or laboratories. As a result, a WLAN user host can detect signals from multiple APs, which may increase the interference and degrade the communication performance. Therefore, we have proposed an AP aggregation algorithm to minimize the number of active physical APs by aggregating the APs in the field by introducing virtual APs. In this paper, we introduce a load balancing stage to this algorithm to maximize the throughput by balancing loads among APs. The effectiveness has been verified through simulations in two instances.

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  • An Extension of Web-based Assistance System for Computer-Scored Paper Tests

    TAKAKI Shogo, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan, AMANO Noriki

    IEICE technical report. Education technology   111 ( 473 )   243 - 248   2012.3

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    A frequent application of mini-exams and quizzes during classes can be effective to enhance the educational effects to students in universities. However, teachers may have to spend much time to prepare the test papers before classes, and grade the test papers from students after them. In order to ease such burdens of teachers, we have proposed a Web-based assistance system for computer-scored paper tests in conventional lecture rooms without computers for students. This system supports the test paper generation, the test paper grading, and the score management. In this paper, we extend the system by adding two new question types, implementing the test paper preview function, and providing the data export function to the Web quiz function in an existing learning assistant system. We evaluate the effectiveness of our proposal through an experiment in one class in our department.

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  • An Extension of Fill-in-the-blank Problem Function in Java Programming Learning Assistant System and Its Application to Class

    KORENAGA Yousuke, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan, AMANO Noriki

    IEICE technical report. Education technology   111 ( 473 )   7 - 12   2012.3

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    The programming language Java has been educated in a lot of universities and professional schools due to the reliability, portability, and easy learning. To assist this Java education, our group has developed a Web-based Java Programming Learning Assistant System (JPLAS) by supporting self-studies of students. JPLAS has the fill-in-the-blank problem function for Java novice students to study Java reserved words. In this function, a teacher first generates fill-in-the-blank problems automatically by removing the specified reserved words randomly from a sample Java code in the database. Then, a student can repeatedly submit answers to the problems until all the answers are correct as self-studies. In this paper, we implement the score graph function so that the students can complete with each other in solving fill-in-the-blank problems by referring the current scores of other students. We apply the function to students in a Java programming class in our department to evaluate the effectiveness of our proposal.

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  • An Implementation of Erroneous Code Indication Function in Java Programming Learning Assistant System Using Test-Driven Development Method

    FUKUYAMA Yuki, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan, AMANO Noriki

    IEICE technical report. Education technology   111 ( 473 )   1 - 6   2012.3

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    To enhance the effect of the Java programming education by assisting self-studies of students, we have proposed a Web-based Java Programming Learning Assistant System (JPLAS) using the test-driven development (TDD) method. In this system, a teacher first registers an exercise subject, a model source code, and a test code. Then, a student submits the answer code on the subject. The answer code is automatically verified by the verification tool at the server, and the verification result log is returned to the student. However, in the current system, even reading the log to find the errors is actually difficult for a student who is a Java programming beginner. In this paper, we implement an erroneous code indication function in JPLAS of graphically showing the error parts on the code. We evaluate the effectiveness of this function through an experiment to 42 students who are learning Java.

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  • An Internship Instance of Developing an Assistance System for Promoting Group Events Using Ruby

    OKADA Tomoya, KORENAGA Yousuke, HAMADA Yuji, IKEDA Daiki, SHIMIZU Junki, TAKEBAYASHI Tatuya, FUNABIKI Nobuo, NAKANISHI Toru, Ishihara HIROYUKI, SATOU Junyuki, OTORI Yoshinori, KOHMOTO Takayuki, OHTA Mayumi

    IEICE technical report. Education technology   111 ( 394 )   35 - 40   2012.1

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    The Graduate School of Natural Science and Technology in Okayama University has offered a special exercise class named "Internship in Engineering and Science" so that the students can experience practical works in companies through long term internships there. In the past two years, we have had the exercise at Systems Nakashima Co., Ltd. in developing a Web application system using Ruby for promoting events such as travels and parties in groups by helping the event planning, the attendance confirmation, and the schedule management. In this paper, we introduce the content of this exercise and the outline of the developed system. Besides, we describe the feedbacks of the students on this exercise.

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  • Training Program for Practical Engineering Design through the Collaboration with Regional Companies

    GOFUKU Akio, TABATA Nobuhisa, TOMITA Eiji, FUNABIKI Nobuo

    Journal of Jsee   60 ( 1 )   52 - 57   2012.1

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    An education program to bring up engineering design capabilities through long-term internship by the collaboration with regional companies has been put in practice for five years. The program is composed of two types of long-term internships and several lectures for patent systems and engineering ethics. This paper describes the outline of the program, educational effects, and our experiences. The program was improved into two educational programs in 2011. The one is a special course to educate engineers and scientists who can lead the technologies of their domains. The other is a long-term internship program for master students in engineering divisions of graduate school. This paper also describes the current activities of the latter program.

    DOI: 10.4307/jsee.60.1_52

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  • Combinational Effect of Spot-checking in Sabotage-tolerance for Volunteer Computing

    WATANABE Kan, FUNABIKI Nobuo, NAKANISHI Toru, FUKUSHI Masaru

    111 ( 408 )   103 - 108   2012.1

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  • An Improved Java Programming Learning System Using Test-Driven Development Method

    Nobuo Funabiki, Yuuki Pukuyama, Yukiko Matsushima, Toru Nakanishi, Kan Watanabe

    INTERNATIONAL MULTICONFERENCE OF ENGINEERS AND COMPUTER SCIENTISTS, IMECS 2012, VOL I   597 - 602   2012

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    To enhance educational effects of Java programming by assisting self-studies of students and reducing teaching loads of teachers, we have proposed a Web-based Java programming learning system using the test-driven development method. In this system, a teacher should register Java programming assignments with statements, model source codes, and test codes using a Web browser. Then, a student can submit a test code and an answer source code for each assignment, where both codes are tested automatically by a testing tool called Junit at the server. Unfortunately, the current system cannot identify an incomplete test code that does not contain the complete test procedures if it has no grammatical error. In this paper, we introduce a code coverage measurement tool called Cobertura to detect such a test code by measuring the coverage rate when the submitted test code tests the model source code. We evaluate the effectiveness of our improved system through experiments with two simple assignments to 11 students who have studied Java.

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  • A dynamic rescheduling extension of cooking-step scheduling algorithm for multiple dish cooking

    Yukiko Matsushima, Nobuo Funabiki, Toru Nakanishi, Kan Watanabe

    The 2nd International Conference on Applied and Theoretical Information Systems Research (2nd ATISR2012)   2012

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  • A code design learning function in Java programming learning assistant system using test-driven development method

    Nobuo Funabiki, Takuya Nakamura, Yukiko Matsushima, Toru Nakanishi, Kan Watanabe

    The 2nd International Conference on Applied and Theoretical Information Systems Research (2nd ATISR2012)   2012

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  • An application of cooking-step scheduling algorithm for homemade cooking and its extensions

    Yukiko Matsushima, Nobuo Funabiki, Toru Nakanishi, Kan Watanabe

    1st IEEE Global Conference on Consumer Electronics 2012, GCCE 2012   94 - 98   2012

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    Homemade cooking can have a key role for a healthy and cost-efficient life. To help this activity for busy people such as workers, students, and child-rearing families, we have proposed a cooking-step scheduling algorithm to suggest an optimal sequence of the cooking-steps when multiple dishes are cooked within a limited time. In this algorithm, the cooking procedure for each dish is divided into a set of cooking-steps, and the execution sequence of all the cooking-steps for the dishes is optimized such that the total cooking time is minimized. In this paper, we first show our application result of this algorithm in cooking five dishes and the arisen problems through this experiment. Then, we present four extensions of this algorithm to solve them. Through simulations and cooking experiments, we verify the effectiveness of the algorithm extensions. © 2012 IEEE.

    DOI: 10.1109/GCCE.2012.6379977

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  • An extension of routing tree algorithm for smart antenna use in wireless Internet-access mesh network

    Nobuo Funabiki, Toru Nakanishi, Kan Watanabe

    1st IEEE Global Conference on Consumer Electronics 2012, GCCE 2012   633 - 637   2012

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    As a cost-efficient scalable Internet-access network, we have studied the architecture, protocols, and design optimizations of the Wireless Internet-access Mesh NETwork (WIMNET). WIMNET is composed of wirelessly connected multiple access-points (APs), where at least one AP acts as a Gateway (GW) to the Internet. Two types of APs are used for the hierarchical configuration to achieve scalability with sufficient bandwidth and low costs, namely, a programmable Smart AP (SAP) equipped with multiple antennas, and a non-programmable Conventional AP (CAP) with a single antenna. For a SAP, a smart antenna using an array antenna should be adopted to enhance the performance by allowing simultaneous activations of multiple links. Because the transmission capacity of a SAP with m antennas can be ideally m times of that of a CAP, the routing path should consider this difference so that the average delay between the GW and any AP be minimized to avoid bottlenecks. In this paper, we present an extension of our previous routing tree algorithm for this smart antenna use in WIMNET to improve the throughput by considering the feature. We evaluate the throughput improvement through simulations using the WIMNET simulator. © 2012 IEEE.

    DOI: 10.1109/GCCE.2012.6379938

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  • Implementation and Evaluation of an Pairing-Based Anonymous Credential System with Constant-Size Proofs and Efficient Proof Generations

    Nasima Begum, Toru Nakanishi, Nobuo Funabiki

    2012 THIRD INTERNATIONAL CONFERENCE ON NETWORKING AND COMPUTING (ICNC 2012)   264 - 268   2012

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    To enhance user privacy, anonymous credential systems allow the user to convince a verifier of the possession of a certificate issued by the issuing authority anonymously. In the systems, the user can prove logical relations on his/her attributes embedded into the certificate. Previously, we proposed a pairing-based system with constant-size proofs. In the system, the proof generation needs only multiplications depending on the size of the proved relations, and it is more efficient than other existing system that needs the exponentiations whose costs are much larger than multiplications. However, our efficient system has never been implemented, and thus the practicality is not evaluated. In this study, we implemented the system, and measured the processing times and data size, when changing the parameters describing the size of the proved relation. The verification time is very fast and constant, and the proof size is also constant, from which we can confirm the practicality. However, the proof generation time increases, when the parameters increase. Although we confirm the practicality in case of small relations, we clarify the problems in case of larger relations, which should be solved in our future works.

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  • Efficient proofs for CNF formulas on attributes in pairing-based anonymous credential system

    Nasima Begum, Toru Nakanishi, Nobuo Funabiki

    15th Annual International Conference on Information Security and Cryptology (ICISC 2012)   2012

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  • An Error Code Highlighting Function in Java Programming Learning Assistant System Using Test-Driven Development Method

    Nobuo Funabiki, Yuuki Fukuyama, Yukiko Matsushima, Toru Nakanishi, Kan Watanabe

    WORLD CONGRESS ON ENGINEERING AND COMPUTER SCIENCE, WCECS 2012, VOL I   230 - 235   2012

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    Recently, the objected-oriented programming language Java has been used in many practical systems including enterprise servers, smart phones, and embedded systems due to its high reliability and portability. To enhance effects of Java programming educations, we have developed a Web-based Java Programming Learning Assistant System (JPLAS). JPLAS adopts the Test-Driven Development (TDD) method for automatic testing of source codes written by students on the server to assist their self-learning. In JPLAS, a teacher needs to register each Java programming assignment with a statement, a reference source code, and a test code. Then, students should write source codes by referring this statement and the test code so that their source codes can be tested automatically at the server by a testing software tool called JUnit with the test code. Unfortunately, the current JPLAS is not friendly to students who have difficulty in reading the log message from JUnit that contains the information on the errors in the source code. In this paper, we implement the error code highlighting function to help such students to find erroneous lines in the code by highlighting them graphically. We evaluate the effectiveness of this function through an experiment for 42 students who are currently taking the Java programming class.

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  • An extension of clustering algorithm for smart-antenna use in wireless mesh networks

    Shigeto Tajima, Nobuo Funabiki, Shigeru Tomisato, Masaharu Hata, Teruo Higashino

    1st IEEE Global Conference on Consumer Electronics 2012, GCCE 2012   638 - 642   2012

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    As a scalable cost-efficient Internet-access network, we have studied the Wireless Internet-access Mesh Network (WIMNET) that is composed of multiple access point (APs) connected through the Wireless Distribution System (WDS). Because all the traffics pass through an Internet Gateway (GW), the resolution of link congestions around the GW is very important. To solve this problem, we have proposed a clustering algorithm to partition the APs into a set of clusters where each cluster consists of the APs sharing the same GW. In addition, we have considered the use of a smart antenna at a special AP called a Smart AP (SAP). In this paper, we extend this clustering algorithm for smart antenna use at SAPs. Besides, we investigate the link activation strategy for the smart antenna, because it allows a variety of link activations for packet transmissions. We evaluate the effectiveness through simulations using the WIMNET simulator. © 2012 IEEE.

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  • A proposal of access-point aggregation approach for multiple wireless local area networks

    Nobuo Funabiki, Md. Ezharul Islam, Toru Nakanishi, Kan Watanabe

    4th International Workshop on Virtual Environment and Network-Oriented Applications (VENOA 2012)   668 - 673   2012

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  • A pairing-based anonymous credential system with efficient attribute proofs

    Amang Sudarsono, Toru Nakanishi, Nobuo Funabiki

    Journal of Information Processing   20 ( 3 )   774 - 784   2012

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    To enhance user privacy, anonymous credential systems allow the user to convince a verifier of the possession of a certificate issued by the issuing authority anonymously. The typical application is the privacy-enhancing electronic ID (eID). Although a previously proposed system achieves the constant complexity in the number of finiteset attributes of the user, it requires the use of RSA. In this paper, we propose a pairing-based anonymous credential system excluding RSA that achieves the constant complexity. The key idea of our proposal is the adoption of a pairing-based accumulator that outputs a constant-size value from a large set of input values. Using zero-knowledge proofs of pairing-based certificates and accumulators, any AND and OR relation can be proved with the constant complexity in the number of finite-set attributes. We implement the proposed system using the fast pairing library, compare the efficiency with the conventional systems, and show the practicality in a mobile eID application. © 2012 Information Processing Society of Japan.

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  • A proposal of CSMA fixed backoff-time switching protocol and its implementation on QualNet simulator for wireless mesh networks

    Sritrusta Sukaridhoto, Nobuo Funabiki, Toru Nakanishi, Kan Watanabe

    Proceedings - 26th IEEE International Conference on Advanced Information Networking and Applications Workshops, WAINA 2012   520 - 525   2012

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    As an inexpensive and scalable Internet access network, we have studied the architecture, protocols, and design optimizations of the Wireless Internet access Mesh Network (WIMNET). WIMNET is composed of multiple access points (APs) that are connected through wireless links. Previously, we have proposed the concept of the CSMA-based Fixed Back off-time Switching (CSMA-FBS) method for WIMNET to improve the performance by giving necessary link activation chances for multi-hop communications. In this paper, we propose a protocol for this CSMA-FBS method implement able on APs, and its actual implementation on the QualNet simulator for evaluations in realistic network environments. The simulation results in two network topologies confirm the effectiveness of our proposal. © 2012 IEEE.

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  • An online fill-in-the-blank problem function for learning reserved words in Java programming education

    Nobuo Funabiki, Yousuke Korenaga, Yukiko Matsushima, Toru Nakanishi, Kan Watanabe

    Proceedings - 26th IEEE International Conference on Advanced Information Networking and Applications Workshops, WAINA 2012   375 - 380   2012

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    The Java programming education to students has been held in a lot of universities and professional schools due to the reliability, portability, and easy learning. To assist this education, our group has developed a Java programming learning system based on the test-driven development method. However, this Web system targets students who have studied Java to some extent. In this paper, we propose a fill-in-the-blank problem function for this system to assist the learning of the Java reserved words by novice Java learners. Our function consists of a teacher service process and a student service process. By the former one, a teacher can generate a fill-in-the-blank problem easily by blanking the specified reserved words randomly from a sample Java code in the database. By the latter one, a student can repeatedly submit answers of a problem until all the questions are correctly solved for self-study. The function is implemented on an existing Web system and is applied to students who are currently learning Java. The questionnaire result confirms the effectiveness of our proposal. © 2012 IEEE.

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  • An Extension of Routing Tree Algorithm Considering Link Speed Change in IEEE 802.11n Protocol for Wireless Mesh Network

    Nobuo Funabiki, Wataru Maruyama, Toru Nakanishi, Kan Watanabe

    2012 9TH INTERNATIONAL CONFERENCE ON UBIQUITOUS INTELLIGENCE & COMPUTING AND 9TH INTERNATIONAL CONFERENCE ON AUTONOMIC & TRUSTED COMPUTING (UIC/ATC)   600 - 605   2012

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    As an inexpensive, flexible, and scalable Internet-access network, we have studied architecture, protocols, and design optimizations of the Wireless Internet-access Mesh NETwork (WIMNET). WIMNET consists of multiple access-points (APs) as wireless routers that are connected through wireless links. One AP acts as a gateway (GW) to the Internet, where any host must reach there for the Internet access through multi-hop communications between APs. Because a lot of traffic must be handled by these links, the latest IEEE 802.11n protocol should be adopted to provide high-speed communications. In this paper, we first show that our throughput measurement results using commercial products implementing this protocol, reveal the quick drop of the throughput as the increase of the link distance. Then, we present extensions of our previously proposed routing tree algorithm for WIMNET and the WIMNET simulator in considering this link speed change by the distance. We verify the effectiveness of our proposals through simulations in four cases with different topologies.

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  • A Lattice Implementation of High-precision IIR Filter for X-ray CT Reconstruction

    Kazuhisa Hayashi, Hiroshi Tsutsu, Yoshitaka Morikawa, Nobuo Funabiki

    INTERNATIONAL MULTICONFERENCE OF ENGINEERS AND COMPUTER SCIENTISTS, IMECS 2012, VOL I   751 - 756   2012

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    The authors previously proposed forward and backward one round (FBOR) method to accelerate the filtering process by realizing the discrete Hilbert transform (DHT) function using an IIR filter in the convolution backprojection (CB) method that is a typical reconstruction algorithm for the X-ray CT. The FBOR method cascades causal and anticausal allpass filters to realize the linear phase DHT, and implements them by parallel ladders of allpass filters. Unfortunately, this method has to adopt the DHT that has the brickwall transition at the zero frequency and thus, requires high sensitivity coefficients in order to reduce distortions of a reconstructed image. As a result, it needs to rely on double precision floating points to avoid cancellations of significant digits. In this paper, we propose a successive-scan one-round (SSOR) method of implementing the DHT by cascading primary lattice allpass filters that allows the use of single precision floating points. We confirm the effec-tiveness of our proposal through simulations.

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  • Modeling and Performance Evaluation of Colluding Attack in Volunteer Computing Systems

    Kan Watanabe, Nobuo Funabiki, Tom Nakanishi, Masaru Fukushi

    INTERNATIONAL MULTICONFERENCE OF ENGINEERS AND COMPUTER SCIENTIST, IMECS 2012, VOL II   1658 - 1663   2012

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    This paper proposes a model of a colluding attack in Volunteer Computing (VC), where some of participants are unreliable and may return incorrect results. The colluding attack is one of the most important issues to realize reliable VC because it may ruin the most basic assumption, i.e. "the majority in voting is correct". Especially, check-by-voting archives the largest efficiency by sorting reliable participants based on whether their results are the majority or not. Thus, if some incorrect results become the majority by colluding attack, it may have significant impacts on check-by-voting. In this paper, we perform a Monte Carlo simulation of VC using the proposed colluding model and evaluate the sabotage-tolerance performance of voting methods. Simulation results show that check-by-voting works well if colluding attack happens.

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  • A Proposal of an Access-Point Aggregation Algorithm for Wireless Local Area Networks

    ISLAM Md. EZHARUL, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan

    IEICE technical report   111 ( 344 )   1 - 6   2011.12

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    Nowadays, multiple wireless local area networks (WLANs) have been deployed in the same building of an institute including a company and a university. Usually, their wireless acess-points (APs) have been independently managed and operated by different groups in the building such as departments or laboratories. As a result, a WLAN user host can detect signals from multiple APs, which may increase the interference and degrade the communication performance. Thus, the minimization of the number of active physical APs by aggregating the allocated APs in the field by introducing virtual APs becomes one of the major challenges in WLANs. In this paper, we formulate this AP aggregation problem for WLANs of aggregating the APs into the minimum number of active APs, and propose its heuristic algorithm that is composed of four phases. The effectiveness of our proposal has been verified through simulations in two instances.

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  • A Clustering Algorithm for WDS Clusters with Two Access-Points Using Smart Antenna in Wireless Mesh Networks

    TAJIMA Shigeto, FUNABIKI Nobuo, TOMISATO Shigeru, HATA Masaharu, HIGASHINO Teruo

    Technical report of IEICE. RCS   111 ( 345 )   81 - 86   2011.12

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    As a scalable Internet access network, we have studied the Wireless Internet-access Mesh Network (WIMNET) that is composed of multiple access point (APs) connected through the Wireless Distribution System (WDS). For large scale WIMNET, because the traffic through the Internet gateway (GW) becomes very high, it is composed of multiple WDS clusters where one cluster consists of APs sharing the same GW. Even in this hierarchial WIMNET, links around the GW are still crowded in each WDS cluster and may become bottlenecks of whole communications. Hence, we have proposed the adoption of a Smart AP (SAP) using the smart antenna technology for bandwidth enhancements. In this paper, we propose an extension of our WDS clustering algorithm for WIMNET such that the GW and one adjacent AP are selected as SAPs in each WDS cluster. Through simulations using grid topology instances, we verify the effectiveness of our algorithm extension.

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  • A Proposal of Efficient Range Proof Protocol for Anonymous Credential System

    IKEDA Daiki, NAKANISHI Toru, FUNABIKI Nobuo

    Technical report of IEICE. ISEC   111 ( 337 )   7 - 14   2011.12

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    An anonymous credential system allows a user to convince a verifier of the possession of user's attributes anonymously. A range proof protocol in an anonymous credential system is the protocol where the user can show that user's attribute belongs to a certain integer range without revealing the attribute. In the previous scheme, while the constant computational complexity is achieved, the size of the public parameters depends on the number of the attributes N. This paper proposes a range proof protocol with O (logTV) public parameter size. We also implement and evaluate it.

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  • Proposal of Reputation System with Strong Secrecy for Managers

    NOMURA Tomoya, NAKANISHIV Toru, FUNABIKI Nobuo

    Technical report of IEICE. ISEC   111 ( 337 )   15 - 20   2011.12

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    In a P2P service such as Internet auctions, there is need for keeping users anonymous, but, in this case, misbehaving user becomes a problem. So, the anonymous users use a reputation system to evaluate each other, where the user can decide whether the other user is misbehaving user or not. However, in the system, the administrator can grasp the change of user's reputation point, it becomes a problem of privacy. In this study, we propose a reputation system with the anonimity even for the administrator by user's managing reputation points in the anonymous certificate. We evaluate the proposed system by processing time of the implementation.

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  • Modeling and Performance Evaluation of Colluding Attack in Volunteer Computing

    WATANABE Kan, FUNABIKI Nobuo, NAKANISHI Toru, FUKUSHI Masaru

    IEICE technical report. Dependable computing   111 ( 252 )   25 - 30   2011.10

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    This paper proposes a model of a colluding attack in Volunteer Computing (VC), where some of participants are unreliable and may return incorrect results. The colluding attack is one of the most important issues to realize reliable VC because it may ruin the most basic requirement, i.e. "the majority in voting is correct". It is used in most current sabotage-tolerance techniques such as M-first voting. Especially, checkbyvoting archives the largest efficiency in current sabotage-tolerance techniques by using the technique called "check by voting" (using the result of a voting as a check). Thus, if some results of votings have been incorrect by colluding attack, it may have significant impacts on checkbyvoting. In this paper, we perform a Monte Carlo simulation of VC using the proposed model and evaluate the sabotage-tolerance performance for both checkbyvoting and M-first voting.

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  • An Implementation of an Anonymous Authentication System with Exclusion of Illegal Users in the Web Services

    2011 ( 3 )   66 - 71   2011.10

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  • An Implementation of Anonymous Attributes Authentication System for Web Services

    2011 ( 3 )   60 - 65   2011.10

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  • An Improvement of Active Access-Point Selection Algorithm for Throughput Maximization in Wireless Mesh Networks

    SHIMIZU Junki, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan

    IEICE technical report   111 ( 232 )   25 - 30   2011.10

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    The wireless Internet-access mesh network (WIMNET) has been studied to realize the inexpensive, scalable Internet-access network by adopting multiple access points (APs) connected by wireless links. WIMNET can improve the dependability to failures of APs and/or links by allocating APs redundantly, whereas redundant APs may cause the increase of the operational cost and the degradation of the throughput due to increasing radio interferences. Therefore, we have formulated the active AP selection problem of selecting the minimum number of active APs among redundant APs in WIMNET and proposed its heuristic algorithm. The simulation results indicated the existence of an active AP selection maximizing the throughput whose number of active APs is larger than the minimum. In this paper, we improve this algorithm for the throughput maximization. We verify the effectiveness of our algorithm improvement through simulations in three instances.

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  • An Improvement of Code Verifications in Java Programming Learning System Using Test-Driven Development Method

    FUKUYAMA Yuki, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan, AMANO Noriki

    IEICE technical report   111 ( 213 )   13 - 18   2011.9

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    For the enhancement of the Java programming education by assisting self-studies of students and reducing loads of teachers, we have proposed and developed a Web-based Java programming learning system using the test-driven development method. In this system, the teacher first registers an exercise subject, a model source code, and a test code. Then, the student submits the test code and the answer code, which are verified by the verification tool at the server. Unfortunately, the current system cannot detect an incomplete test code from a student that does not contain necessary test procedures if it has no grammatical error. In this paper, we introduce a code coverage verification tool into the system in order to find an incomplete test code. After implementing this proposal, we evaluate the effectiveness of the improved system through experiments to 11 students who have studied Java.

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  • An Implementation and Evaluation of Fixed Backoff-time Switching Method on QualNet for Wireless Mesh Network

    SUKARIDHOTO Sritrusta, FUNABIKI Nobuo, NAKANISHI Toru, WATANABE Kan, TAJIMA Shigeto

    IEICE technical report   111 ( 91 )   33 - 38   2011.6

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    As an inexpensive and scalable access network to the Internet, we have studied the architecture, protocols, and design optimizations of Wireless Internet access Mesh Network (WIMNET). WIMNET is composed of multiple access points (APs) connected through wireless links. Previously, we have proposed the CSMA -based Fixed Backoff-time Switching (CSMA-FBS) method for WIMNET to improve the performance by giving necessary link activation chances for multi-hop communications. In this study, we implement the CSMA-FBS method on the QualNet simulator for evaluations in more realistic network environments. The simulation results in three network topologies confirm the effectiveness of our proposal.

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  • A WDS Clustering Algorithm for Wireless Mesh Network with Gateway using MIMO Channel

    TAJIMA Shigeto, FUNABIKI Nobuo, TOMISATO Shigeru, HATA Masaharu, HIGASHINO Teruo

    IEICE technical report   111 ( 8 )   55 - 60   2011.4

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    We have studied the Wireless Internet-access Mesh NETwork (WIMNET) as a scalable wireless local area network that is composed of multiple access points (APs) connected through the Wireless Distribution System (WDS). To avoid the performance degradation due to traffic overloads, the number of APs in a single WDS is limited. Hence, we have proposed a WDS clustering algorithm to partition a given set of APs into a disjoint set of WDS clusters where the APs in one WDS cluster shares a single gateway (GW) to the Internet and are connected by a single WDS. As all the traffics from/to the Internet pass through the GW in a WDS cluster, links incident to the GW can be bottlenecks of whole communications. In this paper, in order to increase the throughput there by adopting the MIMO channel at the GW, we propose an extension of the WDS clustering algorithm to the WIMNET with the MIMO channel GW. Through simulations using several instances, we verify the effectiveness of our algorithm extension.

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  • An Implementation of an Online Fill-in-the-blank Problem Function for Learning Reserved Words in Java Programming

    KORENAGA Yousuke, MATSUSHIMA Yukiko, FUNABIKI Nobuo, NAKANISHI Toru, AMANO Noriki

    IEICE technical report   110 ( 453 )   125 - 130   2011.2

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    The Java programming has been educated to students in a lot of universities and professional schools due to its reliability, portability, and easy learning. To assist the education, our group has developed a Java programming education assistant system based on the test-driven development method. However, this system targets students who have studied Java to some extent. In this paper, we propose the online fill-in-the-blank problem function for this Web system to assist the learning of the reserved words of Java for Java beginners. This function consists of the teacher service function and the student service function. By the former function, a teacher can generate a fill-in-the-blank problem automatically by removing the specified reserved words randomly from a sample Java code in the database. By the latter function, a student can repeatedly submit answers of a problem until all the answers are correct for self-study. The function is implemented at the existing system and is applied to students who are Java beginners, where the questionnaire result confirms the effectiveness of our proposal.

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  • An Implementation of a Web-based Assistance System for Computer-Scored Tests

    KAWANO Hiroki, FUNABIKI Nobuo, NAKANISHI Toru, AMANO Noriki

    IEICE technical report   110 ( 453 )   193 - 198   2011.2

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    Mini-exams and quizzes during classes can be effective to enhance their educational effects to students in universities. However, teachers may have to spend much time to prepare test materials before classes, and grade the test papers from students after them. In this paper, we propose a Web-based assistance system for computer-scored tests in order to reduce these loads by teachers. Our system consists of the question generation & management function, the test generation & management function, the subject generation & management function, the test grading function, and the learning history management function. By treating questions and tests separately such that one test is composed of individual questions, this system makes it possible to reuse existing questions and tests in various subjects by sharing them among teachers. Besides, by automatically generating test papers containing randomly shuffled options, it can prevent students from cheating by peeking at papers of other students at neighbor seats. To evaluate the efficiency, we implemented the system by extending the existing learning management system NOBASU, and applied it to one class in our department.

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  • An Implementation of Menu Planning and Cooking Step Optimization Functions in a Web-based Homemade Cooking Assistance System for Busy Persons

    OKADA Tomoya, MATUSHIMA Yukiko, TANIGUCHI Shiho, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   110 ( 453 )   205 - 210   2011.2

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    For busy persons such as workers, students, and child-growing families, preparations of dishes by homemade cooking may become heavy burdens on weekdays. To solve this problem, our group has developed a Web-based homemade cooking assistance system composed of four main functions. In this paper, we implement the two functions of the menu planning and the cooking step optimization for this system. The first function helps a user to generate a menu manually, or automatically by using the menu selection algorithm. Besides, it allows the user to register the menu information into Google calendar so that the information can be accessed even from a mobile terminal. The second function optimizes the schedule of the cooking steps by using the cooking step optimization algorithm. By outputting the result into a PDF file, the user can use it at cooking. The effectiveness of these functions is confirmed through questionnaire results by 16 students in our department.

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  • A Proposal of a Management System for Open Source Software Usage Manuals Using Content Management System

    RI Denzai, MURAKAMI Yukikazu, FUNABIKI Nobuo

    IEICE technical report   110 ( 453 )   187 - 192   2011.2

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    Recently, the Open Source Software (OSS) has become used at many places. Even the installation and initial configuration of an OSS can be difficult for novice users, because there are few documents and manuals. To address this problem, we have proposed an automatic generation method of installation/configuration manuals for OSS However, this method has another problem of requiring different manuals even for the same OSS, because installation commands or configuration parameters can be different depending on OS distributions and OS/OSS versions. In this paper, we propose an OSS manual management system using a content management system "Joomla!" so that the manuals can be consolidated in a community. We implement the system composed of the four functions for general users, manual creators, community managers, and system managers, and show the effectiveness through usability evaluations using a questionnaire.

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  • Development of an Automatic Generation System of Configuration Manuals for Open Source Software

    KAGAWA Erina, MURAKAMI Yukikazu, FUNABIKI Nobuo

    IEICE technical report   110 ( 448 )   247 - 252   2011.2

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    Recently, Open Source Software (OSS) has become used at many places. However, the use of an OSS is hard for its novice users, because many OSSes have few good manuals. To solve this problem, we have proposed a method of automatically generating a web manual for installing an OSS by editing the log information recorded during the installation process by a skilled user. However, many OSS require to make changes the configuration file. In addition to that more systems are adopting OSS as middlewares such as application servers and DBMSs (Database Management Systems). For these OSS middlewares, it is known that even the processing performance is low under their default settings a great improvement is seen by optimizing their system setting. Therefore, in this research, aiming at accumulation of system optimizing technology, an automatic generation of web-based configuration manual is proposed.

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  • An Application of the WEB Page Layout Optimization Method for Integration of Open Source Software Heterogeneous Manuals

    HORI Yuki, MURAKAMI Yukikazu, FUNABIKI Nobuo

    IEICE technical report   110 ( 448 )   241 - 246   2011.2

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    Recently, the Open Source Software (OSS) has become used at many places. Even the installation and initial configuration of an OSS can be difficult for novice users, because there are few documents and manuals. To address this problem, we have proposed an automatic generation method of installation/configuration manuals for OSS. However, in the conventional system, an installation manual and a configuration manual are managed as an individual file. Therefore, the conventional system had bad convenience. We integrate an installation manual and a configuration manual and define this as an OSS usage manual. When integrate manuals, it is necessary to give a priority and to show information. When the size of a Web manual is changed by the user, a layout changes and visibility falls. In order to solve this problem, we applied to the web-page layout optimization method to proposed manuals.

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  • A Proposal of Cooking Model and Cooking Step Scheduling Algorithm for Multiple Dishes

    MATSUSHIMA Yukiko

    IMECS 2011   127 - 131   2011

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  • An active access-point selection approach for dependable wireless mesh networks

    Nobuo Funabiki, Junki Shimizu, Masaharu Hata, Shigeru Tomisato, Toru Nakanishi, Kan Watanabe

    Journal of Interconnection Networks   12 ( 3 )   137 - 154   2011

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    As an inexpensive, flexible, and scalable Internet-access wireless network, we have studied the architecture, protocols, and design optimizations of the Wireless Internet-access Mesh NETwork (WIMNET) that adopts multiple access-points (APs) connected through wireless links. WIMNET can improve the dependability to failures of APs and/or their links by allocating APs redundantly in the network field. Because redundant APs may increase the operational cost and degrade the throughput due to increasing radio interferences, only the necessary APs for connectivity between the hosts and the Internet gateway should be activated in communications. In this paper, we first define the active AP selection problem of selecting the minimum number of active APs, and prove the NP-completeness of its decision version through reduction from the known minimum set cover problem. Then, we propose an active AP selection algorithm of deactivating APs one by one until no more AP can be deactivated. Due to the limited transmission capacity in WIMNET, we further present an algorithm extension for throughput maximization. We verify the effectiveness of our proposal through simulations in three instances, where the number of active APs is reduced by more than 40% and the throughput is improved by more than 10% from the original in any instance. © 2011 World Scientific Publishing Company.

    DOI: 10.1142/S0219265911002915

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  • An implementation of fixed backoff-time switching method on IEEE 802.11 MAC protocol for wireless Internet-access mesh network

    Nobuo Funabiki, Sritrusta Sukaridhoto, Zhe Wang, Toru Nakanishi, Kan Watanabe, Shigeto Tajima

    The 2011 International Workshop on Smart Info-Media System in Asia (SISA 2011)   67 - 72   2011

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  • A proposal of an active access-point selection algorithm in wireless mesh networks

    Nobuo Funabiki, Junki Shimizu, Toru Nakanishi, Kan Watanabe

    Proceedings - 2011 International Conference on Network-Based Information Systems, NBiS 2011   112 - 117   2011

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    The wireless Internet-access mesh network (WIMNET) has been studied to offer an inexpensive, scalable Internetaccess wireless network by adopting multiple access points (APs) connected by wireless links. WIMNET can improve the dependability to failures of links and/or APs by allocating APs redundantly in the network field. However, redundant APs may increase the operational cost and degrade the throughput due to increasing radio interferences. One solution to this problem is to activate only the necessary APs to provide the connectivity to the hosts while maximizing the throughput. In this paper, we first define this active AP selection problem of selecting the activated APs for communications, and propose its heuristic algorithm. The simulation results in three instances confirm the effectiveness of the proposed algorithm, and indicate the existence of an active AP selection that maximizes the throughput. Then, we present the average hop count and the traffic bias as the indices to seek the active AP selection with the maximal throughput, and the extension of our active AP selection algorithm using them. © 2011 IEEE.

    DOI: 10.1109/NBiS.2011.26

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  • A smart access-point selection algorithm for scalable wireless mesh networks

    Nobuo Funabiki, Sritrusta Sukaridhoto, Masaharu Hata, Shigeru Tomisato, Toru Nakanishi, Kan Watanabe, Shigeto Tajima

    IAENG International Journal of Computer Science   38 ( 3 )   260 - 267   2011

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  • Efficient Proofs of Attributes in Pairing-Based Anonymous Credential System

    Amang Sudarsono, Toru Nakanishi, Nobuo Funabiki

    PRIVACY ENHANCING TECHNOLOGIES   6794   246 - 263   2011

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    An anonymous credential system allows the user to convince a verifier of the possession of a certificate issued by the issuing authority anonymously. One of the applications is the privacy-enhancing electronic ID (eID). A previously proposed anonymous credential system achieves constant complexity in the number of finite-set attributes of the user. However, the system is based on the RSA. In this paper, we show how to achieve the constant complexity in a pairing-based anonymous credential system excluding the RSA. The key idea of the construction is the use of a pairing-based accumulator. The accumulator outputs a constant-size value from a large set of input values. Using zero-knowledge proofs of pairing-based certificates and accumulators, we can prove AND and OR relations with constant complexity in the number of finite-set attributes.

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  • An extension of active access-point selection algorithm for throughput maximization in wireless mesh networks

    Nobuo Funabiki, Junki Shimizu, Toru Nakanishi, Kan Watanabe, Shigeru Tomisato

    Proceedings - 3rd IEEE International Conference on Intelligent Networking and Collaborative Systems, INCoS 2011   367 - 372   2011

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    In order to offer an inexpensive, scalable Internetaccess wireless network, we have studied the architecture, protocols, and design optimizations of the wireless Internet-access mesh network (WIMNET) that adopts multiple access-points (APs) connected by wireless links. WIMNET can improve the dependability to failures of links and/or APs by allocating APs redundantly in the network field. Because redundant APs may increase the operational cost and degrade the throughput due to increasing radio interferences, only the necessary APs for the connectivity between the hosts and the Internet gateway should be activated in communications. Previously, we have defined the active AP selection problem of selecting the minimum number of active APs, and proposed its heuristic algorithm. However, the throughput should be maximized in WIMNET as a bandlimited wireless network, even if the number of active APs is slightly increased. In this paper, we propose the extension of the active AP selection algorithm for the throughput maximization using the average hop count. We confirm the effectiveness of our algorithm extension through simulations in three instances, where the throughput is improved by about 10% with 7-14 additional active APs on average. © 2011 IEEE.

    DOI: 10.1109/INCoS.2011.50

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  • A throughput evaluation of wireless Internet-access mesh network using MIMO and adaptive array antenna

    Shigeto Tajima, Nobuo Funabiki, Shigeru Tomisato, Masaharu Hata, Teruo Higashino

    The 2011 International Workshop on Smart Info-Media System in Asia (SISA 2011)   79 - 84   2011

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  • Automatic generation of configuration manuals for open-source software

    Yukikazu Murakami, Erina Kagawa, Nobuo Funabiki

    Proceedings of the International Conference on Complex, Intelligent and Software Intensive Systems, CISIS 2011   653 - 658   2011

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    The installation and initial configuration of an open-source software can be difficult for novice users because of a common lack of adequate manuals. To address this problem, we have proposed a method of automatically generating Web based installation manuals for open-source software by editing the log information recorded during the installation process by a skilled user. A lot of systems using open-source software require changes of configuration files. Actually, middleware systems such as application servers and database management systems, often exhibit the low performance under their default configuration files. Thus, the optimization of such systems by setting the optimal confirmation is essential for significant performance improvements. In this paper, we propose the extension of our previous method to the automatic generation of Web-based configuration manuals. We verify the effectiveness of our proposal through experiments. © 2011 IEEE.

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  • A proposal of fixed backoff-time switching method by link activation rate for wireless mesh networks

    Shigeto Tajima, Nobuo Funabiki, Teruo Higashino

    Proceedings of the International Conference on Complex, Intelligent and Software Intensive Systems, CISIS 2011   647 - 652   2011

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    As an inexpensive and scalable access network to the Internet, we have extensively studied the Wireless Internet-access Mesh Network (WIMNET) that is composed of multiple access points (APs) connected through wireless links. Because most traffic in WIMNET passes through the gateway (GW) to the Internet, the links around the GW are much crowded so that they should be activated with higher priorities than others. In this paper, we propose the Fixed Back off-time Switching (CSMA-FBS) method for WIMNET using the CSMA/CA protocol to improve the performance by giving necessary activation chances to such links. Before starting communications, the target link activation rate and the active/passive back off-times for collision avoidance are calculated from the expected traffic load for each link. During communications, these back off-times are switched by comparing the actual link activation rate with the target one. By assigning different fixed values to these back off-times, the conflicts among the interfered links can be avoided. Through extensive simulations using two types of network topologies, we verify the effectiveness of our proposal. © 2011 IEEE.

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  • A proposal of a menu planning algorithm for two-phase cooking by busy persons

    Nobuo Funabiki, Shiho Taniguchi, Yukiko Matsushima, Toru Nakanishi

    Proceedings of the International Conference on Complex, Intelligent and Software Intensive Systems, CISIS 2011   668 - 673   2011

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    For busy persons such as working people, students, and nurturing parents, it is very hard to spend a long time in cooking foods by themselves at home after working for long hours on weekdays. As one solution, the cooking process can be divided into two phases, where the preparation steps for foods that they will eat on the following weekdays are performed on a weekend, and the final steps for some foods are finished on the eating day in a short time. Then, the task of generating a menu planning with this two-phase cooking becomes a complex problem to satisfy the limited cooking time. In this paper, we formulate this time-constrained menu planning problem with the two-phase cooking, and prove the NP-completeness of its decision problem through the reduction from the NP-complete knapsack problem. Then, we present its heuristic algorithm based on a simple greedy method for the knapsack problem, where foods are sequentially selected into the menu in descending order of food priorities. We apply the algorithm to the generation of one week menu plan from 53 food candidates, where the result verifies the effectiveness of our approach. © 2011 IEEE.

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  • A proposal of a traffic control method with consumed bandwidth estimation for real-time applications in wireless mesh networks

    Sritrusta Sukaridhoto, Nobuo Funabiki, Toru Nakanishi

    Proceedings of the International Symposium on Consumer Electronics, ISCE   143 - 148   2011

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    As a flexible and cost effective solution for a scalable Internet-access network, we have studied the Wireless Internet-access Mesh NETwork (WIMNET) that is composed of multiple access points (APs). WIMNET utilizes multi-hop communications between APs to provide access to the Internet through a gateway (GW) from associated hosts, which becomes increasingly vulnerable to problems of the available bandwidth degradation and the network latency. As a result, real-time applications such as Voice-over-IP (VoIP) and video conferences are hard in WIMNET. In this paper, we propose a traffic control method with consumed bandwidth estimation to afford real-time applications in WIMNET. After the consumed bandwidth by the requesting applications is estimated, the least priority application is repeatedly dropped at GW using the leaky bucket traffic shaping, until it does not exceed the available bandwidth in WIMNET. The effectiveness of our proposal is verified through simulations using the QualNet simulator. © 2011 IEEE.

    DOI: 10.1109/ISCE.2011.5973801

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  • Minimal smart access-point selection for maximal throughput in wireless mesh networks

    Nobuo Funabiki, Tatsuya Takebayashi, Toru Nakanishi

    The International MultiConference of Engineers and Computer Scientists 2011 (IMECS 2011)   594 - 599   2011

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  • 無線メッシュネットワークでの動作アクセスポイント選択アルゴリズムの提案

    清水淳基, 舩曵信生, 中西透

    電子情報通信学会論文誌(B)   J94-B ( 2 )   264 - 273   2011

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  • A proposal of a web-based computer-scored test assistance system for university education

    Nobuo Funabiki, Hiroki Kawano, Toru Nakanishi, Kan Watanabe

    Proceedings of the International Symposium on Consumer Electronics, ISCE   580 - 585   2011

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    Frequent applications of short tests or quizzes during classes can be effective to enhance educational effects to students in universities. However, teachers may have to spend much time to prepare test materials before classes, and mark the test papers from students after them. In this paper, in order to reduce these loads of teachers, we propose a Web-based computer-scored test assistance system that consists of the five functions for problem generation &amp
    management, test generation &amp
    management, grading, subject generation &amp
    management, and learning profile management. By handling problems and tests separately where one test is composed of several problems, this system allows users to reuse existing problems and tests in various subjects by sharing them among teachers. Besides, by automatically generating test papers containing the randomly shuffled choices for each problem, it can prevent students from cheating by peeking at test papers of other students at neighbor seats. We implemented the system by extending our learning management system called NOBASU, and applied it to one class in our department, where the questionnaire result confirms the effectiveness of the system. © 2011 IEEE.

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  • An implementation of a pairing-based anonymous credential system with constant complexity

    Amang Sudarsono, Toru Nakanishi, Nobuo Funabiki

    The International MultiConference of Engineers and Computer Scientists 2011 (IMECS 2011)   630 - 635   2011

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  • A Proposal of Traffic Control Method with Bandwidth Usage Estimation for Real-Time Applications in Wireless Mesh Networks

    SUKARIDHOTO Sritrusta, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   110 ( 339 )   25 - 30   2010.12

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    As a flexible and cost effective solution for a large-scale Internet access network, we have studied the Wireless Internet-access Mesh NETwork (WIMNET) that is composed of multiple access points (APs). WIMNET utilizes multi-hop communications between APs to access to the Internet through a gateway (GW), which becomes increasingly vulnerable to the problems of the available bandwidth degradation and the network latency. As a result, real-time applications such as Voice-over-IP and Video conferences become hard to work in WIMNET. In this paper, we propose a traffic control method with a bandwidth usage estimation to afford real-time applications in WIMNET. After the consumed traffic is estimated, the least priority traffic is repeatedly dropped at GW using the leaky bucket traffic shaping, until it does not exceed the available bandwidth in WIMNET. The effectiveness of our proposal is verified through simulations using the QualNet simulator.

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  • A Study of an Active Access-Point Selection Index for Throughput Maximization in Wireless Mesh Networks

    SHIMIZU Junki, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   110 ( 339 )   13 - 18   2010.12

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    The wireless Internet-access mesh network (WIMNET) has been studied to realize the inexpensive, scalable Internet-access network by composed of multiple access points (APs) connected by wireless links. WIMNET can improve the dependability to failures of links and APs by allocating APs redundantly, whereas redundant APs may cause the increase of the operational cost and the degradation of the throughput due to increasing radio interferences. Hence, we have formulated the active AP selection problem for selecting functioning APs for communications and proposed its heuristic algorithm. The simulation results indicate the existence of an active AP selection maximizing the throughput. In this paper, we present the average hop count and the traffic bias as the indices for this active AP selection with the maximum throughput. We verify their effectiveness through simulations in three instances.

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  • An Application of the Web-Page Layout Optimization Method to Installation Manuals for Open Source Software

    HORI Yuki, MURAKAMI Yukikazu, FUNABIKI Nobuo

    IEICE technical report   110 ( 339 )   215 - 218   2010.12

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    Recently, the Open Source Software (OSS) has become used at many places. However, the use of an OSS is hard for its novice users, because many OSSes have few good manuals. To solve this problem, we have proposed a method of automatically generating a web manual for installing an OSS by editing the log information recorded during the installation process by a skilled user. However, generated manuals have been designed to fit to the standard size. Many users often change a manual size to watch a manual and a terminal window together. When a manual size is small, the screen scroll operation is needed to look at the main content of the page. When the size is big, the blank space may also be large. In order to solve this problem, we applied to the web-page layout optimization method to proposed manuals.

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  • A Proposal of Fixed Waiting Time Switching Method by Link Activation Rate in Wireless Mesh Networks

    TAJIMA Shigeto, FUNABIKI Nobuo, HIGASHINO Teruo

    IEICE technical report   110 ( 339 )   137 - 142   2010.12

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    As an access network to the Internet, we have studied the Wireless Internet-access Mesh NETwork (WIMNET) that is composed of multiple access points (APs) connected with wireless links. Because most traffics pass through the gateway (GW) to the Internet, the links around the GW are crowded which should be activated with higher priorities in WIMNET. In this paper, we propose the fixed waiting time switching method based on the CSMA/CA protocol (CSMA-FWS) to improve the performance of WIMNET. Before communications, the target link activation rate and the fixed waiting times for link activation/waiting are calculated from expected traffics of each link. During communications, these waiting times are switched by evaluating the link activation rate. Besides, by assigning different values to these waiting times among the links, the conflicts among interfered links are avoided. Through simulations using two types of network topologies, we verify the effectiveness of our proposal.

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  • Ant Colony Optimization for the Node Placement Problem

    OHKURA Keiichi, KATAYAMA Kengo, FUNABIKI Nobuo, MINAMIHARA Hideo, NISHIHARA Noritaka

    IEICE technical report   110 ( 339 )   173 - 178   2010.12

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    We address a problem of finding an optimal node placement that minimizes the amount of traffics reducing the weighted hop distances in multihop lightwave networks. The problem is called Node Placement Problem (NPP). For the NPP, several metaheuristic algorithms have been proposed so far such as genetic algorithm, tabu search, simulated annealing, iterated local search, and memetic algorithm. However, ant colony optimization (ACO) approach, one of the most representative metaheuristics, has not been presented for the NPP yet. In this paper we present an ACO algorithm incorporating k-swap local search (KLS) based on variable depth search for the NPP. To evaluate the performance of the ACO, we tested it on the benchmark problem instance of the NPP. We showed the performance of the ACO with KLS through comparisons with those of the iterated local search and the memetic algorithm that are known to be the highly effective metaheuristics for the NPP.

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  • A Proposal of an Automatic Generation Method of Web-based Configuration Manuals for Open Source Software

    KAGAWA Erina, MURAKAMI Yukikazu, FUNABIKI Nobuo

    IEICE technical report   110 ( 339 )   209 - 214   2010.12

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    Recently, Open Source Software (OSS) has become used at many places. However, the use of an OSS is hard for its novice users, because many OSSes have few good manuals. To solve this problem, we have proposed a method of automatically generating a web manual for installing an OSS by editing the log information recorded during the installation process by a skilled user. However, many OSS require to make changes the configuration file. In addition to that more systems are adopting OSS as middlewares such as application servers and DBMSs (Database Management Systems). For these OSS middlewares, it is known that even the processing performance is low under their default settings a great improvement is seen by optimizing their system setting. Therefore, in this research, aming at accumulation of system optimizing technology, an automatic generation of web-based configuration manual is proposed.

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  • Extensions of Cooking Model for Cooking Step Optimization and Effects of Role Changes of Sub-Cook

    MATSUSHIMA Yukiko, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   110 ( 301 )   19 - 24   2010.11

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    In order to support homemade cooking of busy persons including working people, students, and child-growing families, we have proposed a cooking model to estimate the cooking time by simulating cooking steps by a main cook and a sub-cook who helps the main cook, and a cooking step scheduling algorithm using this model. In this paper, we propose extensions of the model by including additional two cooking steps, namely the nuke step and the mix step, so as to improve the accuracy of the estimated cooking time and the efficiency of the model. At the same time, we investigate effects in cooking time reductions by the increase of possible cooking steps to the sub-cook. The cooking experiment with six foods shows the improvement of the estimation accuracy, where the cooking time difference between the model and the actual cooking was about two minutes. The model calculations with various numbers of foods show that the cooking time can be reduced by the increase of possible cooking steps to the sub-cook.

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  • Menu Selection and Bulk-Buying Ingredient Selection Algorithms for Home Cooking Support by Busy Persons

    TANIGUCHI Shiho, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   110 ( 301 )   25 - 30   2010.11

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    For busy persons such as working people and students, it is very important to reduce the time for buying ingredients and cooking foods after working for long hours on a weekday. As one solution to achieve it, they buy ingredients in bulk and finish the preparation steps of foods as the preparation phase on a weekend after planning the menus of the following weekdays. On a weekday, they only need to buy remaining ingredients and cook the finishing steps of the foods as the finishing phase that they will eat on the day, which can reduce the necessary time for home cooking. In this paper, we propose the menu planning algorithm and bulk-buying ingredient selection algorithm for this two-phase cooking. Because these problems can be reduced from the NP-complete knapsack problem, these algorithms are based on greedy methods for the knapsack problem. Through solving instances for these problems, we verify the effectiveness of the proposed algorithms.

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  • Forward-Secure Group Signatures from Pairings

    Toru Nakanishi, Yuta Hira, Nobuo Funabiki

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E93A ( 11 )   2007 - 2016   2010.11

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    To reduce the damage of key exposures forward secure group signature schemes have been first proposed by Song In the forward secure schemes a secret key of a group member is updated by a one way function every interval and the previous secret key is erased Thus even if a secret key is exposed the signatures produced by the secret keys of previous Intervals remain secure Since the previous forward secure group signature schemes are based on the strong RSA assumption the signatures are longer than pairing based group signatures In addition the complexity of the key update or signing/verification is O(T) where T is the total number of Intervals In this paper a forward secure group signature scheme from pairings is proposed The complexity of our key update and signing/verification is O(log T)

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  • A Minimum Smart Access-Point Allocation for Maximal Throughput in Scalable Wireless Mesh Networks

    TAKEBAYASHI Tatsuya, FYNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   110 ( 240 )   69 - 74   2010.10

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    As a flexible and low-cost access network to the Internet, we have studied WIMNET (Wireless Internet-access Mesh NETwork) that is composed of multiple access-points (APs) as wireless routers. WIMNET utilizes two types of APs to achieve the scalability and the communication bandwidth while reducing the cost. One type is an expensive, PC-based smart AP (SAP) that can use multiple channels for wireless communications and has various functions for the Internet access. The other type is an inexpensive, commercial-based conventional AP (CAP) that can use only one channel. By adopting a small number of SAPs and a large number of CAPs, the large-scale WIMNET can achieve the bandwidth expansion and the cost reduction. In this paper, we propose a minimal SAP allocation algorithm for maximal throughput in WIMNET using our conventional SAP allocation algorithm. Our algorithm finds a solution that minimizes the reduction of the cost function when the number of SAPs increases. Through simulations in four instances, we show the effectiveness of our proposal.

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  • Developments of the Node Configuration Problem for WDM Ring Networks

    ISOGAI MEGUMI, FUNABIKI NOBUO, NAKANISHI TORU

    2010 ( 3 )   1 - 8   2010.9

  • An Extension of the Cooking Step Scheduling Algorithm for Various Dishes to Two Cooks

    MATSUSHIMA Yukiko, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   110 ( 172 )   19 - 24   2010.8

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    The reduction of the cooking time with helps of partners, friends, and children is very important for busy persons. In this paper, we present the extension of the cooking step scheduling algorithm for various dishes to the case of two cooks, and the generalization of the cooking model for this extension by defining the state transition diagrams of dishes, pans and pots, a sink, stoves, and cooks, which have been proposed by our group. We implemented the algorithm as the Java application, and applied it to an instance of six dishes. The result confirmed the effectiveness of our proposal, where the case with two cooks reduced the cooking time by 16 minutes from the case with one cook.

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  • Extensions of the Access Point Allocation Algorithm for Wireless Mesh Networks

    Walaa Hassan, Nobuo Funabiki, Toru Nakanishi

    IEICE TRANSACTIONS ON COMMUNICATIONS   E93B ( 6 )   1555 - 1565   2010.6

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    Previously, we have proposed an access point (AP) allocation algorithm in indoor environments for the Wireless Internet-access Mesh NETWork (WIMNET) using one gateway (GW) to the Internet. WIMNET consists of multiple APs that are connected wirelessly mainly by the Wireless Distribution System (WDS), to expand the coverage area inexpensively and flexibly In this paper, we present two extensions of this algorithm to enhance the applicability to the large-scale WIMNET. One is the multiple GW extension of the algorithm to increase the communication bandwidth with multiple GWs, where all the rooms in the network field are first partitioned into a set of disjoint GW clusters and then, our previous allocation algorithm is applied to each GW cluster sequentially. The APs in a GW cluster share the same GW. The other is the dependability extension to assure the network function by maintaining the connectivity and the host coverage, even if one link/AP fault occurs, where redundant APs are added to the AP allocation by our previous algorithm. The effectiveness of our proposal in terms of the number of APs and the throughput is verified through simulations using the WIMNET simulator.

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  • A prioritized link activation method for access-point communications in wireless mesh networks

    TAJIMA Shigeto, FUNABIKI Nobuo, HIGASHINO Teruo

    IEICE technical report   110 ( 4 )   47 - 52   2010.4

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    As a flexible, inexpensive access network to the Internet, we have studied the Wireless Internet-access Mesh NETwork (WIMNET) that is composed of multiple access points (APs) connected with wireless links. Because most traffics pass through the gateway (GW) to the Internet, the links around the GW are crowded and can become bottlenecks in WIMNET. In this paper, we propose the prioritized link activation method based on the TDMA protocol to improve the performance of WIMNET. At each time slot, the links scheduled there are activated if they have packets. Then, other links are sequentially activated in descending order of priorities given by the traffics, if they have packets and do not cause interferences. Through simulations using two types of network topologies, we verify the effectiveness of our proposal.

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  • A WDS Clustering Algorithm for Wireless Mesh Networks

    Shigeto Tajima, Nobuo Funabiki, Teruo Higashino

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS   E93D ( 4 )   800 - 810   2010.4

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    Wireless mesh networks have been extensively studied as expandable. flexible. and inexpensive access networks to the Internet This paper focuses on one composed of multiple access points (APs) connected through multihop wireless communications mainly by the wireless distribution system (WDS) For scalability, the proper partition of APs into multiple WDS clusters is essential, because the number of APs in one cluster is hinted due to the increasing radio interference and control packets In this paper, we formulate this WDS clustering problem and prove the NP-completeness of its decision version through reduction from a known NP-complete problem Then we propose its heuristic algorithm. using a greedy method and a variable depth search method. to satisfy the complex constraints while optimizing the cost function We verify the effectiveness of our algorithm through extensive simulations. where the results confirm as superiority to the existing algorithm in terms of throughput.

    DOI: 10.1587/transinf.E93.D.800

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  • Test Code Assignment Function in Java Programming Education Support System Using Test-Driven Development Method

    FUKUYAMA YUKI, FUNABIKI NOBUO, NAKANISHI TORU, AMANO NORIKI

    2010 ( 21 )   1 - 8   2010.2

  • A Proposal of the Active Access Point Selection Algorithm for Wireless Internet-access Mesh Networks

    SHIMIZU Junki, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   109 ( 421 )   7 - 12   2010.2

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    As a scalable, inexpensive Internet-access network, we have studied the wireless Internet-access mesh network (WIMNET) that is composed of multiple access points (APs) connected by wireless links. WIMNET can improve the dependability to failures of links and APs by allocating APs redundantly. However, redundant APs may cause the increase of the operational cost and the degradation of the communication performance due to increasing radio wave interferences. In this paper, we formulate the active AP selection problem for selecting functioning APs for communications, and propose its algorithm. After finding the communication path using all the APs, our algorithm seeks the minimization of active APs by repeating the removal of one active AP and the check of the path existence. Through simulations using the WIMNET simulator, we show that our algorithm can reduce the number of active APs and there exists the best number of active APs in terms of the throughput.

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  • Revocable Group Signature Schemes with Constant Costs for Signing and Verifying

    Toru Nakanishi, Hiroki Fujii, Yuta Hira, Nobuo Funabiki

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E93A ( 1 )   50 - 62   2010.1

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    Lots of revocable group signature schemes have been proposed so far. In one type of revocable schemes, signing and/or verifying algorithms have O(N) or O(R) complexity, where N is the group size and R is the number of revoked members. On the other hand, in Camenisch-Lysyanskaya scheme and the followers, signing and verifying algorithms have O(1) complexity. However, before signing, the updates of the secret key are required. The complexity is O(R) in the worst case. In this paper, we propose a revocable scheme with signing and verifying of O(1) complexity, where any update of secret key is not required. The compensation is the long public key of O(N). In addition, we extend it to the scheme with O( root N)-size public key, where signing and verifying have constant extra costs.

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  • Anonymous IEEE802.1X authentication system using group signatures

    Amang Sudarsono, Toru Nakanishi, Yasuyuki Nogami, Nobuo Funabiki

    Journal of Information Processing Society Japan   51 ( 3 )   691 - 702   2010

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  • A Node Aggregation Approach for WDM Ring Networks

    Nobuo Funabiki, Toru Nakanishi, Megumi Isogai

    TENCON 2010: 2010 IEEE REGION 10 CONFERENCE   829 - 834   2010

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    For a high-speed metropolitan area network (MAN), a ring network based on the wavelength-division multiplexing (WDM) technology has been deployed to solve global information explosions in the Internet. To enhance the network performance, we have studied the node configuration problem, particularly for the one with the double-ring architecture where each node is equipped with fast-tunable transmitters and wavelength-fixed receivers (TT-FR) as fiber interfaces. In our studies, by adopting additional transmitters/receivers, nodes can afford far larger traffics than conventional ones. This fact indicates that plural nodes should be aggregated into one so that the transmitters/receivers can be utilized more efficiently. This paper presents a definition of the node aggregation problem for the WDM ring network and its simple greedy heuristic algorithm. The simulation results using the network simulator show the effectiveness of our approach.

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  • An extension of the web-page layout optimization method for multimodal browsing sizes

    Nobuo Funabiki, Junki Shimizu, Megumi Isogai, Toru Nakanishi

    Proceedings - 13th International Conference on Network-Based Information Systems, NBiS 2010   139 - 146   2010

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    Recently, Web-page browsings at various terminals have become popular due to deployments of small mobile devices and large flat displays. To deal with this recent trend, we have proposed a Web-page layout optimization method for multimodal browsing sizes. It dynamically changes box locations and font sizes by switching CSS files for different browsing sizes, so that the main content can be accessed without the screen scroll operation even at a small size whereas the blank space is avoided at a large size. However, in this method, any box location must be specified by the absolute value in HTML/CSS files, which is not easy under a variety of browsing sizes. In this paper, we propose the extension of this method for flexible Web-page designs using the normal flow, the liquid layout, and the float property, where the browser automatically arranges the boxes. Using Ajax, the box location and the font size is switched to fit to the current browsing size by our method. The effectiveness of our proposal is verified through a usability test using sample Web-pages at small sizes. © 2010 IEEE.

    DOI: 10.1109/NBiS.2010.18

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  • Software architecture and characteristic functions in learning management system "NOBASU"

    Nobuo Funabiki, Toru Nakanishi, Noriki Amano, Hiroki Kawano, Yuuki Fukuyama, Megumi Isogai

    Proceedings - 2010 10th Annual International Symposium on Applications and the Internet, SAINT 2010   109 - 112   2010

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    Recently, a learning management system (LMS) using the Web technology has been used at many educational institutions. To support educational activities in our department, we have independently developed an LMS called NOBASU (NetwOrk-Based Assistant System for University education) to improve the quality while reducing costs. Besides conventional functions in LMS, NOBASU has incorporated several original ones such as the keyword submission function for preparing and reviewing class contents. In this paper, we present two new characteristic functions for the Java programming education in NOBASU. The Java code test function verifies the specifications in source codes from students using the test-driven development (TDD) method. The Java test code submission function requests students to submit test codes so that they can generate detailed program specifications by themselves. © 2010 IEEE.

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  • A Proposal of a Smart Access Point Allocation Algorithm for Scalable Wireless Mesh Networks

    Kanako Uemura, Nobuo Funabiki, Toru Nakanishi

    INTERNATIONAL MULTICONFERENCE OF ENGINEERS AND COMPUTER SCIENTISTS (IMECS 2010), VOLS I-III   848 - 853   2010

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    As a flexible, inexpensive, and extensive Internet access network, we have studied WIMNET (Wireless Internet-access Mesh NETwork) composed of multiple access points (APs) as wireless mesh routers. WIMNET utilizes two types of APs to achieve the scalability with sufficient bandwidth while reducing costs. One is the expensive, programmable smart AP (SAP) that can use plural channels for wireless communications and has various functions for the Internet access. Another is the inexpensive, non-rogrammable conventional AP (CAP) that can use only one channel. To enhance the performance, the proper SAP allocation is critical, because the number of SAPs is much smaller than that of CAPs. In this paper, we present the definition of the SAP allocation problem, and its algorithm of extracting the optimum solution in terms of the newly defined cost function after finding the communication route configuration by applying our previous algorithms. We verify the effectiveness through simulations in three network topologies using the WIMNET simulator.

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  • Software Architecture and New Functions in Learning Management System "NOBASU"

    Nobuo Funabiki, Toru Nakanishi, Noriki Amano, Hiroki Kawano, Kanako Uemura

    INTERNATIONAL MULTICONFERENCE OF ENGINEERS AND COMPUTER SCIENTISTS (IMECS 2010), VOLS I-III   665 - 670   2010

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    Recently, the learning management systems (LMS) using the Web technology has been developed and used at a lot of educational institutions. We have continuously developed an original LMS called NOBASU (NetwOrk-Based Assistant System for University education) to support various educational activities in our department to improve the quality while reducing costs. In this paper, we describe the software architecture and the outline of distinguishing functions in NOBASU. In addition to conventional functions in LMS, NOBASU has incorporated several original ones such as the keyword submission function for preparing and reviewing classes, the lecture-scene playback function using the digital picture-card show, and the writing style check function for report submissions. We have implemented them in NOBASU and evaluated the effectiveness through applications to real classes in our department.

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  • A Proposal of a Cooking Order Optimization Algorithm of Various Menus

    MATSUSHIM YUKIKO, FUNABIKI NOBUO, NAKANISHI TORU

    2009 ( 13 )   1 - 6   2009.12

  • Improvement of Dependable Access Point Allocation Algorithm and Introduction of Route Availability for Wireless Mesh Networks

    HASSAN Walaa, FARAG Tamer, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   109 ( 326 )   11 - 16   2009.12

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    As a scalable, flexible, and inexpensive network, we have studied the wireless Internet-access mesh network (WIMNET) that is composed of multiple access points (APs) connected by the wireless distribution system (WDS). Previously, we have proposed the AP allocation algorithm, and its dependability extensions such that one link fault or one AP fault does not impair the connectivity of the network. In this paper, we improve this heuristic algorithm by adding the improvement stage using the local search method. Besides, we introduce the route availability (RA) index to estimate the certainty of connections between hosts and the Internet gateway. We verify the effectiveness of our proposal through simulations in two instances.

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  • A Proposal of Efficient Attribute-Based Group Signature Schemes Using Pairings

    FUJII Hiroki, NAKANISHI Toru, FUNABIKI Nobuo

    IEICE technical report   109 ( 271 )   15 - 22   2009.11

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    Group signature scheme is the digital signature scheme enhancing the privacy of the user, and efficient pairing-based schemes have been proposed. Recently, some attribute-based group signature schemes are proposed, where the signer's attributes can be verified. The attribute-group signature allows us to construct more complex groups, because it can prove the logical relation of attributes such as 'AND' and 'OR'. However, the previouse schemes, the number of pairings and exponentiations in signing and verification depends on the number of attributes. In this paper, we propose an efficient attribute-base group signature scheme, where the computational complexity doesn't depend on the number of attributes.

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  • A Proposal of a Smart Access Point Allocation Algorithm for Scalable Wireless Mesh Networks

    UEMURA Kanako, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   109 ( 228 )   13 - 18   2009.10

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    For a flexible and low-cost access network to the Internet, we have studied WIMNET (Wireless Internet-access Mesh NETwork) that is composed of multiple access points (APs) as wireless routers. WIMNET utilizes two types of APs to achieve the scalability and the communication bandwidth while reducing the cost. One type is the expensive, note-PC based smart AP (SAP) that can use multiple channels for wireless communications and has various functions for the Internet access. Another type is the inexpensive, commercial-based conventional AP (CAP) that can use only one channel. For the performance enhancement, the proper allocation of SAPs among APs is critical in WIMNET, because the number of SAPs is usually much smaller than that of CAPs. In this paper, we present the formulation of the SAP allocation problem for WIMNET and its heuristic algorithm. Our algorithm seeks the best SAP allocation in terms of the newly defined cost function, after finding the communication route by applying our previous algorithms. We verify the effectiveness of our proposal through simulations in three instances using the WIMNET simulator.

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  • A node configuration algorithm with bandwidth bottleneck resolution for WDM ring networks

    Megumi Isogai, Nobuo Funabiki, Toru Nakanishi, Yosuke Isshiki

    PHOTONIC NETWORK COMMUNICATIONS   18 ( 2 )   218 - 226   2009.10

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    The wavelength-division multiplexing (WDM) technology has been extensively studied and actually deployed as a key technology to solve global information explosions by multiplexing plural signal paths using different wavelengths into one optical fiber. Among WDM-based network architectures, this article focuses on a double-ring one for a next-generation metropolitan area network (MAN), where each node is normally equipped with two pairs of fast-tunable transmitters and wavelength-fixed receivers (TT-FR) as interface to two fibers. To enhance the network performance, additional transmitters/receivers at nodes and receiver wavelengths should be assigned optimally, so that the bandwidth bottleneck can be resolved both on nodes and fiber links. This article formulates this node configuration problem with bandwidth bottleneck resolution as a combinatorial optimization problem, and proves the NP-completeness of its decision version. Then, it presents the two-phase heuristic algorithm composed of a greedy method and a variable depth search (VDS) method. Our algorithm is evaluated through extensive network simulations, where the results support the effectiveness of this joint assignment approach.

    DOI: 10.1007/s11107-009-0185-y

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  • Improvement of Anonymous Authentication System Using Proxies and Its Application to an Anonymous Bulletin Board

    YANO Masaya, NAKANISHI Toru, FUNABIKI Nobuo

    IEICE technical report   109 ( 207 )   45 - 50   2009.9

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    Our research group has implemented the anonymous authentication system based on a group signature scheme for Web services. To avoid modifications of Web servers and browsers, this system uses proxies. However, the system has problems that the lack of the session management causes the communication delay, and that any application of the system has not been implemented, yet. In this study, we implemented the session management function and applied it to an anonymous bulletin board. The experimental results show that the communication time is reduced in a session due to the session management and that the anoymous bulletin board is available in practical time.

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  • An accessibility improvement in the Web-page layout optimization method for adapting to browsing size

    ISOGAI Megumi, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   109 ( 160 )   81 - 86   2009.7

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  • A Proposal of an Educational-support System for Java Programming Using the Test-driven Development Method

    MATSUSHIMA Yukiko, KASAI Yasuhiro, FUNABIKI Nobuo, NAKANISHI Toru, AMANO Noriki

    IEICE technical report   109 ( 82 )   7 - 12   2009.6

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    This paper presents an educational-support system for Java programming using the test-driven development method, with the goals of reducing the teacher load in evaluating program codes submitted from students and giving corrections and comments to them, and improving the student learning environments. To achieve our goals, this system adopts a Java program verification tool called JUnit, and can generate the test code to verify the student codes from the model code to the assignment made by the teacher in a semi-automatic way. By providing the test code to students as the code specification in the assignment, the verification accuracy is enhanced with reduction of the ambiguity in code implementations. The questionnaire results from both teachers and students confirm the effectiveness of the proposed system in the Java programming education.

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  • An Implementation of a Group Signature Scheme with Efficient Verifier-Local Revocation Check

    SUDARSONO Amang, NAKANISHI Toru, SAKEMI Yumi, NOGAMI Yasuyuki, FUNABIKI Nobuo

    IEICE technical report   109 ( 42 )   37 - 42   2009.5

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    A group signature scheme with efficient verifier-local revocation check has been proposed. This scheme provides a more efficient revocation check, using the multi-pairing technique for a product of pairings. However, this scheme has not been implemented and evaluated. This paper presents an implementation of the group signature scheme and the experimental results.

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  • A Generalized Access Point Allocation Algorithm for Wireless Mesh Networks in Indoor Environments

    FARAG Tamer, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   109 ( 36 )   31 - 36   2009.5

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    Previously, we have proposed an access point (AP) allocation algorithm in indoor environments for the Wireless Internet-access Mesh NETwork (WIMNET) with one gateway (GW) to the Internet. WIMNET is composed of multiple APs that are connected with wireless links, mainly using the wireless distribution system (WDS). In this paper, we generalize this algorithm to handle multiple GWs in the field that are essential for the large scale WIMNET. The generalized algorithm first divides the rooms in the network field into a set of GW clusters by two steps, initial greedy clustering and clustering search improvement. Where the APs allocated in the rooms of the same cluster are connected to the same GW. Then, the previous AP allocation algorithm is applied to the rooms in each cluster sequentially. The effectiveness of our proposal is verified through extensive simulations using the WIMNET simulator.

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  • Dependability Extensions of the Access Point Allocation Algorithm for Wireless Mesh Networks

    HASSAN Walaa, FARAG Tamer, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   109 ( 36 )   37 - 42   2009.5

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    As a scalable, flexible, and inexpensive network, we have studied the wireless Internet-access mesh network (WIMNET) that is composed of multiple access points (APs) connected by the wireless distribution system (WDS). WIMNET may suffer from failures of links or APs due to hardware faults or network environmental changes. In this paper, we propose dependability extensions to link/AP faults of the AP allocation algorithm for WIMNET in indoor environments that has been proposed by our group. The extended algorithm finds AP allocations where even if one link/AP is failed, the connectivity of the APs is maintained, while seeking the minimization of the number of additional APs and the maximization of the performance. The effectiveness of our proposal is verified through simulations using the WIMNET simulator.

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  • An Access Point Allocation Algorithm for Indoor Environments in Wireless Mesh Networks

    Tamer Farag, Nobuo Funabiki, Toru Nakanishi

    IEICE TRANSACTIONS ON COMMUNICATIONS   E92B ( 3 )   784 - 793   2009.3

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    As a flexible, cost effective solution for a large-scale access network to the Internet, we have studied the design optimization of the Wireless Internet-access Mesh NETwork (WIMNET). WIMNET consists of multiple access points (APs) that have wireless links between them mainly on the wireless distribution system (WDS). In WIMNET, the links around the Internet gateway can be bottlenecks because every packet passes through it after multihop link activations. Besides, the link quality may be degraded by obstacles in indoor environments. Thus, the proper allocation of APs is essential in WIMNET, so that the communication quality should be ensured while the installation and management cost be minimized. In this paper, we formulate this AP allocation problem for indoor environments in WIMNET with the proof of the NP-completeness of its decision version. Then, we present its two-stage heuristic algorithm composed of the initial greedy allocation and the iterative improvement. The effectiveness of our proposal is verified through extensive simulations in three indoor environments.

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  • An Online Check Function of Writing Style in the Learning Management System "NOBASU"

    KAWANO Hiroki, FUNABIKI Nobuo, NAKANISHI Toru, AMANO Noriki

    IEICE technical report   108 ( 470 )   169 - 174   2009.2

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    Our research group has developed an original Learning Management System (LMS) named NOBASU to improve educational services to students in our department. This paper presents an online check function of writing style on NOBASU. This function checks the writing styles of "Rhetoric", "Report Length" and "Keywords" in students' reports, and quickly provides results to them. The latest list of frequently used words selected from all submitted reports are also shown. To evaluate efficiency of this function, we implemented and applied it to a lecture in our department. According to the questionnaire survey, we found the effectiveness for students in learning writing styles.

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  • A WEB Database System for Managing Open Source Software Installation Manuals

    MURAKAMI Yukikazu, KAN Etsu, FUNABIKI Nobuo, NAKANISHI Toru, TOKUNAGA Hidekazu, SHIGETA Kazuhiro

    IEICE technical report   108 ( 470 )   163 - 168   2009.2

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    Recently, the Open Source Software (OSS) has become used at many places. However, the use of an OSS is hard for its novice users, because many OSSes have few good manuals, and the installation of an OSS package sometimes requires installations of multiple OSS packages to be integrated together. To solve this problem, we have proposed a method of automatically generating a WEB manual for installing an OSS by editing the log information recorded during the installation process by a skilled user. This method has a problem of requiring different manuals even for the same OSS, because installation commands may be different depending on the OS distribution for the PC and the OS/OSS versions. It is impossible to create all the manuals to cover any difference. In this paper, we propose a WEB database system for managing installation manuals so that skilled OSS users can easily upload new manuals for OSSes with new versions, and the similar manual display function after investigating differences of installation commands under different OS/OSS versions and OS distributions.

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  • Improvements in the WDS Clustering Algorithm for Wireless Internet-access Mesh Networks

    TAJIMA Shigeto, FUNABIKI Nobuo, HIGASHINO Teruo

    IEICE technical report   108 ( 457 )   343 - 348   2009.2

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    We have studied the Wireless Internet-access Mesh NETwork (WIMNET) as a large-scale multihop wireless network using Wireless Distribution System (WDS) for Internet access network. We have proposed the heuristic algorithm for the WDS clustering problem to achieve the scalable WIMNET. In this paper, we propose the four improvements of our algorithm; 1) consideration of total hop counts and total interferences in the cost function, 2) random selection of starting APs, 3) modification of the cost function for the gateway AP selection, and 4) consideration of interferences for the route selection. Through simulations using two types of network topologies, we verify the effectiveness of these improvements.

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  • A Multi-Server Video Encoding System Using Divided Video Files at Scene Changes

    OKADA Genya, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   108 ( 392 )   79 - 82   2009.1

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    Recently, with spread of high-performance personal computers and broadband networks, the use of video contents has become popular. As a result, the fast encoding process of video files is very important to improve the convenience of video contents. In this paper, we present a multi-server video encoding system to speed up the encoding process by dividing one video file into multiple fragments and encoding them in parallel using multiple servers. To improve the quality of the reunited video file, we divide the source video file at scene changes of the content. We have implemented the proposed system, and confirmed that our system using three servers can reduce the encoding process time into the half of the single server case.

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  • A Proposal of an Web Page Layout Optimization Method for Various Browser Sizes

    ISSHIKI Yosuke, FUNABIKI Nobuo, NAKANISHI Toru, ISOGAI Megumi

    IEICE technical report   108 ( 392 )   83 - 88   2009.1

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    Recently, the opportunity of Web browsing using terminals with various sizes has increased due to the development of a variety of terminals. Unfortunately, most Web pages have been designed to be fit to terminals with the standard size. As a result, the screen scroll operation is necessary to access the main content at a small-size terminal, whereas the blank space becomes large at a large-size terminal. In this paper, we focus on the separation of the document structure description by an XHTML file and the appearance description by a CSS file. Then, we propose a method of delivering the Web page layout fit to the browsing size. This method first generates the CSS file fit to each size automatically from the Web page files that have been produced by a user for the standard size. Then, it dynamically changes the CSS file using JavaScript. We confirm the effectiveness of our proposal at various sizes by generating an Web page using this method.

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  • A Proposal of Structured Learning Assistance Function in Lecture-Scene Playback System Using Digital Picture-Card Show

    Nobuo Funabiki, Aki Mouri, Kanako Uemura, Toru Nakanishi

    CISIS: 2009 INTERNATIONAL CONFERENCE ON COMPLEX, INTELLIGENT AND SOFTWARE INTENSIVE SYSTEMS, VOLS 1 AND 2   983 - 988   2009

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    The Web-based lecture-scene playback system using the digital picture-card show has been studied to improve the educational quality of lectures with computer-aided slide presentations in universities. In this system, fine still images of lecture scenes, containing the lecturer the blackboard, and the presentation screen, are periodically taken by a commercial digital photo camera, and the lecturer voice is recorded into a digital file by a personal computer during a class. Then, the digital picture-card show to play back the lecture scenes is edited by selecting one image and the voice file section corresponding to one lecture scene that is defined as the time span of teaching one slide page by the lecturer The picture-card show is delivered to students through the World-Wide Web system on demand. In this paper we propose the structured learning assistance function for this lecture-scene playback system, so that students can study important technical concepts in the lecture structurally This function classifies the lecture scenes corresponding to one concept into five structures, and generates the links between them automatically. Through applications to one course for freshmen in our department, we show the effectiveness of our proposal.

    DOI: 10.1109/CISIS.2009.103

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  • 操作ログを用いたオープンソースソフトウエアのインストールマニュアル自動生成法の提案

    村上幸一, 舩曵信生, 徳永秀和, 重田和弘, 中西透

    情報処理学会論文誌   50 ( 3 )   926 - 939   2009

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  • A web-based installation manual management system for open source software

    Yukikazu Murakami, Nobuo Funabiki, Hidekazu Tokunaga, Kazuhiro Shigeta, Toru Nakanishi

    NCM 2009 - 5th International Joint Conference on INC, IMS, and IDC   1261 - 1266   2009

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    Recently, Open Source Software (OSS) has become commonly used at many places. Unfortunately, although the use of OSS is often hard for novice users, many OSSes have few good manuals. To solve this problem, we have proposed a method of automatically generating a Web-based installation manual for an OSS by editing the log information recorded during the installation process by a skilled user. However, this method has another problem of requiring several manuals even for the same OSS, because installation commands may be different depending on the installation environment such as Linux distributions and versions. In addition, novice users sometimes make input mistakes during installation process that cannot be detected by themselves. In this paper, we propose a Web-based system to manage the created manuals so that users can easily use them. By incorporating the analogous manual search algorithm after investigating command changes under different environments, our system is able to show similar manuals if no existing manual matches to the search condition. Besides, we propose the installation guidance function to avoid mistakes by users. It monitors the input commands by a user, and displays the correct commands with the error message if a mistake is found. The experimental results in installing OSS packages by novice users confirm the effectiveness our proposal. © 2009 IEEE.

    DOI: 10.1109/NCM.2009.183

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  • Forward-Secure Group Signatures from Pairings

    Toru Nakanishi, Yuta Hira, Nobuo Funabiki

    PAIRING-BASED CRYPTOGRAPHY - PAIRING 2009   5671   171 - 186   2009

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    To reduce the damage of key exposures, forward-secure group signature schemes have been first proposed by Song. In the forward-secure schemes, a secret key of a, group member is updated by a one-way function every interval and the previous secret key is erased. Thus, even if a secret key is exposed, the signatures produced by the secret keys of previous intervals remain secure. Since the previous forward-secure group signature schemes are based on the strong RSA assumption, the signatures are longer than pairing-based group signatures. In addition, the complexity of the key update or signing/verification is O(T), where T is the total number of intervals. In this paper, a forward-secure group signature scheme from pairings is proposed. The complexity of our key update and signing/verification is O(log T).

    DOI: 10.1007/978-3-642-03298-1_12

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  • A Proposal of a Web-page Layout Optimization Method for Multimodal Browsing Sizes

    Nobuo Funabiki, Yosuke Isshiki, Megumi Isogai, Toru Nakanishi

    ISCE: 2009 IEEE 13TH INTERNATIONAL SYMPOSIUM ON CONSUMER ELECTRONICS, VOLS 1 AND 2   449 - 453   2009

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    Recently, Web-page browsing opportunities at multimodal browsing sizes have increased due to developments of various terminals. Meanwhile, most Web pages have been designed to fit to the standard size. As a result, the screen scroll operation is necessary to access the main content at a small size, whereas the blank space becomes large at a large size. In this paper, we propose a Web-page layout optimization method for multimodal browsing sizes by focusing on the standard Web design style with the separation of the document structure description by an XHTML file and the appearance description by a CSS file. Our method automatically generates a set of CSS files fit to different sizes from the files designed for the standard size by a user. Then, it dynamically switches to the CSS file fit to the current browsing size using JavaScript. We confirm the practicality of our proposal through experiments of the Web page generation and access at various sizes.

    DOI: 10.1109/ISCE.2009.5156917

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  • A Comparative Study of Open Source Softwares for Virtualization with Streaming Server Applications

    Sritrusta Sukaridhoto, Nobuo Funabiki, Toru Nakanishi, Dadet Pramadihanto

    ISCE: 2009 IEEE 13TH INTERNATIONAL SYMPOSIUM ON CONSUMER ELECTRONICS, VOLS 1 AND 2   333 - +   2009

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    Currently, several streaming servers are available to provide a variety of multimedia applications such as VoD (Video-on-Demand), IP-phone, and IP-TV. As a result, the provision of multiple streaming servers on a single machine using the virtualization technology has become important in order to save the operational/management costs while enhancing the performance and the reliability of the system. In this paper, we show the performance evaluation of two :representative open source softwares for the virtualization technology, Xen and OpenVZ, in various configurations of applications on three open source streaming servers, Red5, Darwin, and VLC. Our experimental results indicate that OpenVZ provides the better performance for streaming applications with Darwin and VLC whereas Red5 can run only on Xen.

    DOI: 10.1109/ISCE.2009.5156885

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  • スケーラブル無線メッシュネットワークのための通信路構成最適化アルゴリズム

    上村香菜子, 舩曵信生, 中西透

    スケーラブル無線メッシュネットワークのための通信路構成最適化アルゴリズム   J92-B ( 9 )   1526 - 1537   2009

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  • Revocable Group Signature Schemes with Constant Costs for Signing and Verifying

    Toru Nakanishi, Hiroki Fujii, Yuta Hira, Nobuo Funabiki

    PUBLIC KEY CRYPTOGRAPHY-PKC 2009, PROCEEDINGS   5443   463 - 480   2009

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    Lots of revocable group signature schemes have been proposed so far. In one type of revocable schemes, signing and/or verifying algorithms have O(N) or O(R) complexity, where N is the group size and It is the number of revoked members. On the other hand, in Camenisch-Lysyanskaya scheme and the followers, signing and verifying algorithms have O(1) complexity. However, before signing, updates of the secret key are required. The complexity is O(R) in the worst case. In this paper, we propose a revocable scheme with signing and verifying of O(1) complexity, where no updates of secret key are required. The compensation is the long public key of O(N). In addition, we extend it to the scheme with O(root N)-size public key, where signing and verifying have constant extra costs.

    DOI: 10.1007/978-3-642-00468-1_26

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  • A web-based lecture scene playback system using digital picture-card show with structured learning assistance function

    Aki Mouri, Nobuo Funabiki, Toru Nakanishi

    INTERNATIONAL JOURNAL OF WEB AND GRID SERVICES   5 ( 4 )   372 - 389   2009

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    Computer-aided slide presentations have become common at lectures in universities. To improve the educational quality, this paper presents it Web-based lecture scene playback system using the digital picture-card show with the structured learning, assistance function. Fine still images of lecture scenes are periodically taken by a digital camera, and the lecturer voice is recorded by a personal computer, which are edited to produce the digital picture-card show. The structured learning assistance function classifies the picture cards representing the slides containing each important concept into five structures, and generates their links. The system was applied to freshman courses in our department where questionnaire results confirmed the effectiveness.

    DOI: 10.1504/IJWGS.2009.030265

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  • An implementation of writing style check function in learning management system “NOBASU”

    Hiroki Kawano, Nobuo Funabiki, Toru Nakanishi, Noriki Amano

    An implementation of writing style check function in learning management system “NOBASU”   227 - 228   2009

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  • A Heuristic Optimization Algorithm for Panoramic Image Generation Problem from Multiple Cameras

    Megumi Isogai, Nobuo Funabiki, Toru Nakanishi

    EMERGING INTELLIGENT COMPUTING TECHNOLOGY AND APPLICATIONS, PROCEEDINGS   5754   297 - 306   2009

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    Recently, a panoramic image has been expected in various applications due to the advantage of expressing a wide range of scenes by one image. In this paper, we propose a heuristic optimization algorithm for the panoramic image generation problem from multiple cameras. Our-three-stage algorithm composed of the approximate calibration, the detailed calibration, and the image synthesis, transforms the images of the side cameras to be fit to the image of the central camera as best as possible. The image parameters are optimized by a local search method with a. Tabu period as a typical heuristic optimization method. Through experiments, we show the effectiveness of our proposal.

    DOI: 10.1007/978-3-642-04070-2_34

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  • An Implementation of Anonymous Authentication System for Web Services Using Proxies

    Toru Nakanishi, Hiroki Obayashi, Nobuo Funabiki

    ISCE: 2009 IEEE 13TH INTERNATIONAL SYMPOSIUM ON CONSUMER ELECTRONICS, VOLS 1 AND 2   121 - 123   2009

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    This paper shows an implementation of the anonymous authentication system for Web services. This system uses privacy-enhancing digital signatures, called group signatures, which allow the user to be anonymously authenticated. Since the adopted group signature scheme utilizes novel cryptographic algorithms, the simple introduction or the authentication to the Web browsers and servers needs modifications of them. Thus, we use proxies in our implementation to avoid the modifications. We show that the authentication time is practical by the experiments.

    DOI: 10.1109/ISCE.2009.5156831

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  • A Proposal of a Scalable Web Server System Using Virtual Machine Monitor "Xen"

    SHOJI Tomoya, INOUE Yuuki, FUNABIKI Nobuo, NAKANISHI Toru, KAGOTANI Hiroto

    IEICE technical report   108 ( 286 )   105 - 108   2008.11

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    Recently, the virtualization technology has been often used to construct servers due to the efficiency of the computer resource utilization and the easiness of the system extension. The method of composing cluster systems using the virtualized servers has also been proposed. In this paper, we propose a safe and scalable Web server system using the virtualization technology. In this system, the SSL authentication protocol is adopted to authenticate the server hosts and the encrypted data communications. Besides, the system management tool is incorporated for the simple system management by realizing the automatic update functions of the system softwares such as the operating system and the Web server. We implemented the proposed system using Puppet as the system management tool, Ruby SNMP as the system management library, and Xen as the virtualization machine monitor. The experimental result using our implementation confirms the short time for the Web server extension.

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  • A Construction of the Smart Access Point for Practical Wireless Mesh Networks

    HIRAKATA Kengo, HORIUCHI Satoshi, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   108 ( 286 )   63 - 68   2008.11

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    Recently, the demand for the expansion of the service area by the wireless local area network (WLAN) has become strong due to rapid deployments of WLANs. We have studied WIMNET (wireless Internet-access mesh network) as the WLAN technology of constructing the Internet access network to the large area with the low cost and the short preparation time. In WIMNET, the service area can be flexibly expanded by adding new access points (APs) that are wirelessly connected using WDS (Wireless Distribution System). In this paper, we present the smart access paint (SAP) equipped with the Web cache function, and the multiple network interfaces, in order to solve the throughput shortage problem when the size of WIMNET increases to afford a number of hosts. We construct a simple WIMNET using multiple SAPs that were implemented on mobile personal computers, and evaluate the functions in SAP through communication experiments.

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  • A Proposal of an Efficient Forward-Secure Group Signature Scheme Using Pairing

    HIRA Yuta, NAKANISHI Toru, FUNABIKI Nobuo

    IEICE technical report   108 ( 284 )   47 - 54   2008.11

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    Group signature scheme is one of signature schemes which keep signer's identity information secret. To prevent a problem that an adversary who obtains valid user's secret key can forge the signature easily in conventional group signature schemes, an RSA-based group signature scheme with forward-security that means unforgeability for signatures signed before a key exposure was proposed. However, this scheme requires O(T) complexity for key up-dating or signing/verifying. Then, in this paper, we propose a pairing-based forward-secure group signature scheme with a key update of O(1) complexity and signing/verifying of O(log T) complexity, by adding a key updating based on a tree structure. We also show that the proposed scheme satisfies the forward-security.

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  • A Proposal of an Optimal Assignment Algorithm for General Academic Subject Registrations

    SHOJI Tomoya, FUJII Hiroki, UEMURA Kanako, KAWANO Hiroki, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   108 ( 247 )   51 - 56   2008.10

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    Currently, general academic subjects in Okayama University consist of four categories, namely, "main subjects", "individual subjects", "guidance subjects", and "foreign language subjects". Among them, for "main subjects" and "foreign language subjects" that have much freedom in choice, students are requested to submit the ranks of the subjects that they want to take in the next semester beforehand. Then, the assignment of subjects to students is processed manually using the submitted ranks. However, this assignment task is very hard because it is necessary to assign fairly several thousand students at the same time while considering the capacity of each classroom, the bias in popularity among subjects, and movements of students between two distant campuses. In this paper, we define the assignment problem of general academic subjects to students as a combinational optimization problem, and propose its heuristic algorithm composed of two stages. We implement the algorithm as a Ruby application, and verify the effectiveness using real data in our university.

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  • Reduction of Public-Key Size in a Revocable Group Signature Scheme with Constant Costs for Signing and Verifying

    FUJII Hiroki, HIRA Yuta, NAKANISHI Toru, FUNABIKI Nobuo

    IEICE technical report   108 ( 207 )   33 - 38   2008.9

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    Group signature scheme is the digital signature scheme enhancing the privacy of the user. We proposed a revocable scheme where signing and verifying require only O(1) costs, while various schemes were previously proposed. However, the scheme has a problem that the public key size is O(N). In this paper, we extend the scheme to reduce the public key size into O(√N). In addition, we implement it to confirm the reduction of the size and show that the scheme works at practical execution times.

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  • Extensions of Supporting Functions in the Learning Management System "NOBASU"

    KASAI Yasuhiro, FUNABIKI Nobuo, AMANO Noriki, NAKANISHI Toru

    108 ( 88 )   45 - 50   2008.6

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  • A Proposal of a 4-layered Software Architecture for Learning Management Systems and Its Implementation for "NOBASU"

    BABA SHOTA, FUNABIKI NOBUO, AMANO NORIKI, NAKANISHI TORU

    IPSJ SIG Notes   2008 ( 31 )   55 - 60   2008.3

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    The Learning Management System (LMS), as a platform using the World Wide Web, has been introduced for educational activities in recent years. Our research group has actually developed an original LMS named NOBASU for educational services in our department. LMS usually needs to be extended and modified to meet the changing demands in educations. In this research, we propose a 4-layered software architecture to construct LMS with the simple structure for easy developments. Through the implementation of our proposed architecture to NOBASU, we verified the effectiveness of our approach.

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  • A Proposal of An Automatic Manual Generation Method for Installing Several Open Source Soft Wares Cooperation

    MURAKAMI Yukikazu, FUNABIKI Nobuo, TOKUNAGA Hidekazu, SHIGETA Kazuhiro

    IPSJ SIG Notes   2008 ( 31 )   79 - 84   2008.3

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    An open source software (OSS) is a software whose source code has been public through the Internet, so that everybody can use and modify it freely. As a result, a lot of companies, governments, and universities have now become using OSSs. However, the use of an OSS is actually hard for its beginners, because many OSSs have few good manuals, where an OSS has usually been developed by volunteers, and the installation of an OSS sometimes requires installations of several OSS packages before it. To solve this problem, we have proposed a method of automatically generating an installation manual of an OSS. In this paper, we implement the system for this method. Then, we extend our proposed method to generating the installation manual of an OSS that requires installations of other OSS packages at the same time. We conduct experiments using an OSS example requiring installations of four OSS packages to verify the usefulness of our method.

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  • An Extension of the Routing Tree Algorithm for Two-Layer Wireless Mesh Networks

    UEMURA Kanako, FUNABIKI Nobuo, NAKANISHI Toru, FARAG Tamer

    IEICE technical report   107 ( 524 )   329 - 334   2008.3

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    Currently, we have studied the Wireless Internet-access Mesh NETwork (WIMNET) as a scalable, flexible, and low-cost access network to the Internet, using multiple access points (APs) that are connected with each other through wireless links. In WIMNET, two types of APs are actually adopted to realize the scalability and the communication bandwidth while reducing the cost. One is the expensive, note-PC based smart AP (SAP) that can use multiple channels for wireless communications and has various functions for the Internet access. Another is the inexpensive, commercial-based conventional AP (CAP) that can use only one channel. In this paper, we propose the extension to this two-layer WIMNET of our routing tree algorithm that have been proposed for the single-layer WIMNET using only SAPs. The simulation results in two instances by the WIMNET simulator show that using our extended routing tree algorithm, the throughput of the two-layer WIMNET with a small number of SAPs does not become worse than that of the single-layer one.

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  • A Proposal of a Classification and Link Method of Lecture Scenes for Structured Learning

    MOURI AKI, FUNABIKI NOBUO, NAKANISHI TORU

    IPSJ SIG Notes   2008 ( 13 )   87 - 92   2008.2

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    We have studied the Web-based assistance system for the structured learning using five categories of keywords in university lectures. In this paper, we propose the method for classifying into five categories the lecture scenes that are generated in our Digital picture-card based LECTure scene playback system (DILBCT), and for linking these scenes related to the same keyword on the Web system. The proposed method first generates the list of the keywords for the structured learning from the keywords that have been submitted to NOBASU, our Web-based learning management system, from students for the preparation and the review of each class. Then, it extracts the keywords and their locations in the presentation slides for the lecture. Finally, for each keyword, it classifies the slides containing the same keyword into five categories, and generates the links between the corresponding lecture scenes. For evaluations, we implemented the experimental system for the proposed method by modifying DILECT, and applied it to one class for freshmen in Department of Communication Network Engineering at Okayama University. The questionnaire results from students show that our method effectively improves their understanding of this class.

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  • A Two-Stage Algorithm for Access Point Allocation in Indoor Environments for Wireless Mesh Networks

    Tamer Farag, Nobuo Funabiki, Toru Nakanishi, Kanako Uemura

    2008 14TH ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS, (APCC), VOLS 1 AND 2   261 - 265   2008

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    As a flexible, inexpensive large-scale access network to the Internet, we have studied WIMNET (Wireless Internet-access Mesh NETwork). WIMNET is composed of multiple access points (APs) as wireless routers, where each AP has multihop wireless connections with others by the wireless distribution system (WDS). In WIMNET, communications between APs and the Internet gateway can become the bottleneck due to multihop link activations. Besides, the link quality in indoor environments may be degraded by obstacles such as walls. Thus, the proper allocation of APs is essential, such that the installation cost and the maximum hop count between APs should be minimized while any host in the service area must be covered by at least one AP In this paper, we formulate this AP allocation problem in indoor environments for WIMNET, and present its two-stage heuristic algorithm composed of the initial AP allocation and the AP allocation optimization with the association host optimization. The effectiveness of our approach is verified through extensive simulations using our WIMNET simulator.(1)

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  • A Proposal of an Installation Manual Generation Method for Open Source Software Using Operation Logs

    Yukikazu Murakami, Nobuo Funabiki, Hidekazu Tokunaga, Kazuhiro Shigeta, Toru Nakanishi

    SITIS 2008: 4TH INTERNATIONAL CONFERENCE ON SIGNAL IMAGE TECHNOLOGY AND INTERNET BASED SYSTEMS, PROCEEDINGS   547 - 554   2008

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    An Open Source Software (OSS) is the software whose source code has been public, usually through the Internet, so that everybody can use and modify it freely. A lot of companies, governments, and universities are now using OSS technologies because of the advantages they bring. However the use of an OSS is actually hard for its beginners, because many OSSes have few good manuals, where they have usually been developed by volunteers. Besides, the installation of an OSS package sometimes requires installations of multiple OSS packages to be integrated together In this paper we propose a method of automatically generating an installation manual of an OSS package, including the one requiring the integration of multiple OSS packages. Then, we implement the proposed method for evaluations. Our experimental results in installations of OSS packages including the one requiring the integration of four packages by generated manuals verify the effectiveness of our method.

    DOI: 10.1109/SITIS.2008.62

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  • A Lecture Scene Playback System using Digital Picture-Card Show for Distance Learning

    Nobuo Funabiki, Aki Mouri, Walaa Hassan, Toru Nakanishi

    2008 22ND INTERNATIONAL WORKSHOPS ON ADVANCED INFORMATION NETWORKING AND APPLICATIONS, VOLS 1-3   2008   1071 - 1076   2008

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    Recently, computer-aided slide presentations have been commonly used at lectures in universities. To improve their educational quality, this paper presents an Web-based lecture scene playback system using the digital picture-card show for distance teaming. In this system, fine still images of lecture scenes containing the lecturer, the blackboard, and the screen, are periodically taken by an off-the-shell digital photo camera, and the lecturer voice is recorded into a digital file by a personal computer during a class. Then, the digital picture-card show to play back the lecture scenes is edited by selecting one image and the voice file interval corresponding to one lecture scene defined as the time span of teaching one slide page by the lecturer The picture-card show is delivered to students through the World-Wide Web system on demand. We have implemented and applied our System to one course for freshmen in our department. The system performance and the questionnaire results from students show that our system is very efficient and practical to improve understandings and motivations of students for study of this course.

    DOI: 10.1109/WAINA.2008.73

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  • Efficient revocable group signature schemes using primes

    Toru Nakanishi, Nobuo Funabiki

    IPSJ Journal   49 ( 9 )   2951 - 2962   2008

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  • An implementation of anonymous IEEE802.1X authentication with user revocation

    Amang Sudarsono, Toru Nakanishi, Kouhei Miki, Nobuo Funabiki

    3rd Joint Workshop on Information Security (JWIS 2008)   240 - 245   2008

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  • A minimum-delay routing tree algorithm for access-point communications in wireless mesh networks

    Nobuo Funabiki, Kanako Uemura, Toru Nakanishi, Walaa Hassan

    RIVF 2008 - 2008 IEEE International Conference on Research, Innovation and Vision for the Future in Computing and Communication Technologies   2008   161 - 166   2008

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    As a scalable, flexible access network to the Internet, we have studied the design optimization and the implementation of the Wireless Internet-access Mesh NETwork (WIMNET). WIMNET is composed of multiple access points (APs) that are connected with each other by wireless communications. At least one AP performs as the gateway (GW) to the Internet. Any host in the network can access to the Internet through this GW, after associating its neighbor AP and communicating with multihop wireless links between APs. The delay along the routing path degrades the performance of WIMNET. To avoid the bottleneck of communications by minimizing the maximum delay, we formulate the routing tree problem for AP communications, and prove the NP-completeness of its decision version. Then, we propose the greedy heuristic algorithm of sequentially selecting one link that minimizes the delay of the predicted tree containing the link. The effectiveness of our algorithm is verified through extensive simulations in instances with 25 APs using the WIMNET simulator. ©2008 IEEE.

    DOI: 10.1109/RIVF.2008.4586349

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  • A bandwidth bottleneck resolution approach to node configuration optimization in WDM ring networks

    Megurni Isogai, Nobuo Funabiki, Yosuke Isshiki, Toru Nakanishi

    2008 IEEE SARNOFF SYMPOSIUM   2008 ( S13.4 )   340 - 344   2008

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    The wavelength-division multiplexing (WDM) technology has been extensively studied as a key technology to solve global information explosions. WDM multiplexes plural signal paths using different wavelengths into one optical fiber. Among WDM-based network architectures, this paper focuses on a double-ring network for a next-generation metropolitan area network (MAN). Each node is normally. equipped with two pairs of fast-tunable transmitters and wavelength-fixed receivers (TT-FR) as interface to two fibers. To enhance the network performance, additional transmitters/receivers at nodes and receiver wavelengths should be assigned optimally depending on its design requirement, so that the bandwidth bottleneck can be resolved both on nodes and fibers. This paper formulates this node configuration problem as a combinatorial optimization problem and presents its two-phase heuristic algorithm using the greedy and variable depth search (VDS) methods. Our approach is evaluated through network simulations, where the results verify the effectiveness of this joint assignment approach.

    DOI: 10.1109/SARNOF.2008.4520106

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  • A Dynamic Channel Assignment Technique for Wireless Internet-access Mesh Networks

    Walaa Hassan, Nobuo Funabiki, Toru Nakanishi

    2008 14TH ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS, (APCC), VOLS 1 AND 2   271 - 275   2008

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    The wireless Internet-access mesh network (WIMNET) has been studied to provide a flexible, inexpensive large-scale access network to the Internet. WIMNET is composed of multiple access points (APs) as wireless routers that are communicated with each others through multihop wireless links mainly by the wireless distribution system (WDS). In WIMNET, hosts may move in the field, which can raise issues such as the quality of service, the channel interference, and the network load management. As a result, the adaptive channel assignment to the wireless links between APs to host distributions, becomes essential to improve the performance of WIMNET. In this paper, we formulate this dynamic channel assignment (DCA) problem for WIMNET, and present a DCA technique through modifications of our existing study with the newly defined decision function for the channel reassignment. The effectiveness of our approach is verified through extensive simulations using the WIMNET simulator.

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  • An Implementation of an Anonymous IEEE802.1X Authentication with User Revocation Reducing Mobile Host's Load

    MIKI KOUHEI, NAKANISHI TORU, KAWASHIMA JUN, FUNABIKI NOBUO

    IPSJ SIG Notes   2007 ( 126 )   43 - 48   2007.12

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    The IEEE802.1X authentication has been used well as an authentication protocol in the Access Point for the Internet connection. There is a problem that mobile host's privacy information can be leaked to the Internet service provider in this protocol. To solve this problem, we have proposed and implemented an anonymous authentication with user revocation using the group signature. However, there is a problem of this method that mobile host's load increases in proportion to the number of moblie hosts in the system. In this paper, an anonymous IEEEd02.1X authentication with a user revocation reducing mobile host's load is implemented by using a pairing-based group signature with verifier-local revocation, and the authentication time is evaluated.

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  • Throughput Measurements under Various Contention Window Sizes in Wireless Mesh Networks

    KATO Hideaki, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   107 ( 403 )   55 - 60   2007.12

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    As a scalable access netwok to the Internet, we have studied the Wireless Internet-access Mesh NET-work (WIMNET) that is composed of multiple access points (APs) with multihop communications. In WIMNET, the throughput shortage can be caused by interferences among communication links between APs, and the thoughput unfairness between APs can be caused by the difference on numbers of hops from APs to the gateway. As a solution to these problems, we have proposed the contention window (CW) size control method in CSMA/CA protocol, and have evaluated it through simulations. In this paper, we evaluate the effect of our proposal through throughput measurements in real environments after implementing it on a Linux-PC. Our results show that the optimal CW size is actually different depending on the number of APs in WIMNET, and there is a trade-off between the increase of the average throughput and the fairness of the throughput between APs.

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  • An Implementation of a Privacy Enhancing SSL/TLS Protocol Based on Group Signatures

    OBAYASHI Hiroki, NAKANISHI Toru, KAWASHIMA Jun, FUNABIKI Nobuo

    IEICE technical report   107 ( 397 )   79 - 84   2007.12

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    While various Web services have spread, a lot of private information leaks have been often caused by the service vendors. One method to solve this problems is the use of the anonymous authentication based on group signatures. Group signatures allow the service vendors to verify that a signature is signed by a valid user, but they cannot know who is the signer. Therefore, the anonymous authentication based on group signatures can protect user's privacy while preventing illigal access. In this paper, we implement a privacy enhancing SSL/TLS protocol based on group signatures with membership revocation that does not need the change of user's certificate, and evaluate the authentication time. In a group with 5000 members where 10% of its members are revoked, the authentication needs about 3 seconds. This result shows the practicality of this anonymous authentication protocol for a medium scale group.

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  • A Heuristic Algorithm for Access Point Allocation in Indoor Environments for Wireless Mesh Networks

    FARAG Tamer, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   107 ( 378 )   55 - 60   2007.12

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    We have studied WIMNET (Wireless Internet-access Mesh NETwork) as a flexible and inexpensive large-scale access network to the Internet. WIMNET is composed of multiple access points (APs) as wireless routers, where each AP has multihop wireless connections with others by the wireless distribution system (WDS). In WIMNET, communications between APs can become the bottleneck due to their multihop link activations. Besides, the link quality may be degraded by obstacles such as walls in indoor environments. Thus, the proper allocation of APs is essential, such that the maximum hop count between APs should be minimized while any host in the field must be covered by at least one AP. In this paper, we formulate this AP allocation problem in indoor environments for WIMNET. Then, we present its three-stage heuristic algorithm composed of the initial AP allocation, the AP allocation optimization, and the association host optimization. The effectiveness of our approach is verified through extensive simulations using our WIMNET simulator.

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  • An Implementation of uClinux-VServer for Embedded Systems

    KAWASHIMA JUN, NAKANISHI TORU, FUNABIKI NOBUO

    2007 ( 121 )   7 - 12   2007.12

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    In this paper, we report an implementation of uClinux-VServer and its evaluations. This uClinux-VServer is actually implemented by porting Linux-VServer, an OS-level virtualization system, to uClinux. uClinux can run on a CPU with no MMU (Memory Management Unit), and thus it is suitable for embedded systems. VServer offers a virtual operating platform to a machine so that application programs can be tested there while restricting the interference to the host system on the machine. The evaluation results of the implemented uClinux-VServer show the porting overhead is very small, and the performance of applications on it has no difference from the performance on the conventional uClinux.

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  • A Proposal of a Routing Tree Generation Algorithm for Minimizing the Maximum Delay in Wireless Mesh Networks

    UEMURA Kanako, FUNABIKI Nobuo, NAKANISHI Toru, FARAG Tamer

    IEICE technical report   107 ( 261 )   57 - 62   2007.10

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    We have studied the Wireless Internet-access Mesh NETwork (WIMET) as a scalable wireless network to access the Internet. WIMNET is composed of multiple access points (APs) that have wireless connections with each other where at least one AP performs as the gateway AP (GW-AP) to the Internet. Each host can access to the Internet through a GW-AP after multihop wireless communications between APs from its associated AP. Thus, the increases of the transmission delay at communication links around the GW-AP and the propagation delay through the routing path between an AP and a GW-AP can degrade the performance of WIMNET. In this paper, we formulate the routing tree generation problem for AP communications to minimize the maximum delay for the bottleneck solution, and propose its heuristic algorithm. We show the effectiveness of our algorithm through simulations in two instances by using the WIMNET simulator.

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  • An Improved Node Configuration Algorithm for WDM Ring Networks

    ISSHIKI Yosuke, ISOGAI Megumi, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   107 ( 250 )   27 - 32   2007.10

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    Recently, the Wavelength-Division Multiplexing (WDM) technology has attracted great interests as a key technology of realizing high-speed communications by multiplexing multiple optical signals using different wavelengths into a single optical fiber. As a WDM-based ring network for the next generation platform of metropolitan area networks, we have studied the optimal design of HORNET (Hybrid Optoelectronic Ring NETwork) for the performance improvement. In fact, we have defined the node configuration problem of assigning additional transmitters and receivers to each node under their total limits and of assigning a wavelength to each receiver, such that the communication collision rate is minimized, and presented its heuristic algorithm. In this paper, we propose the improved objective function of minimizing bottleneck bandwidth and wavelength assignment algorithm based on the variable depth search. The effectiveness of our proposal is verified through simulations, where the performance is compared with the conventional method.

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  • A short verifier-local revocation group signature scheme with backward unlinkability

    Toru Nakanishi, Nobuo Funabiki

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E90A ( 9 )   1793 - 1802   2007.9

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    Previously Verifier-Local Revocation (VLR) group signature schemes from bilinear maps were proposed. In VLR schemes, only verifiers are involved in the revocation of a member, while signers are not. Thus, the VLR schemes are suitable for mobile environments. Furthermore, the previously proposed schemes satisfy the important backward unlinkability. This means that even after a member is revoked, signatures produced by the member before the revocation remain anonymous. This property is needed in case of a voluntary leave of a member or in case of a key loss. However, in the previous schemes, signatures become long, due to the adopted assumption, which should be improved in order to apply the schemes to the mobile environments. In this paper an improved VLR scheme is proposed with the shorter group signatures. This is achieved by using a different assumption, DLDH assumption, and improving zero-knowledge proofs in the group signatures. The length of the proposed group signatures is reduced to about 53% of that of the previous ones.

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  • An Implementation of a Pairing-Based Group Signature Scheme with Verifier-Local Revocation

    HIRA Yuta, KATO Hidehiro, NAKANISHI Toru, NOGAMI Yasuyuki, FUNABIKI Nobuo, MORIKAWA Yoshitaka

    IEICE technical report   107 ( 209 )   69 - 76   2007.8

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    Group signature scheme is one of signature schemes which keep signer's identity information secret. A pairing-based group signature scheme which can make a signer sign without any revocation information and has the short length of the signature was proposed. However this scheme has a problem that the anonymity cannot be proved in case of using the twisted pairing which is known for an efficient implementation of pairing. Then, in this paper, we extend the previous scheme to have the provable anonymity in case of using twisted pairing. In addition, we efficiently implemented the extended scheme by transforming some equations and introducing parallel processing, and then we show that the extended scheme can be executed for a practical time on a server with multi-core CPU even if about 500 members are revoked.

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  • A Proposal of An Automatic Manual Generation Method for Installing Open Source Soft Wares using Log Files

    MURAKAMI Yukikazu, FUNABIKI Nobuo, TOKUNAGA Hidekazu, SHIGETA Kazuhiro

    IEICE technical report   107 ( 205 )   51 - 56   2007.8

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    An open source software (OSS) is a software whose source code is public through the Internet, so that everybody can use and modify it freely. As a result, a lot of companies, governments, and universities are now using OSS. However, the use of OSS is actually hard for beginners because OSS has few good manuals, where OSS has been developed by volunteers. In this paper, we propose a method of automatically generating a manual for installing OSS using log files at the installation process by a trained user. Our experimental results for its evaluations using the installation of Tomcat, an Web OSS, show that more people could complete the installation of this OSS by using the manual generated by the proposed method than by using the existing manual on an Web site.

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  • Extensions of an Web-based Learning Management System "NOBASU"

    OKADA Genya, FUNABIKI Nobuo, NAKANISHI Toru, AMANO Noriki

    IEICE technical report   107 ( 205 )   75 - 80   2007.8

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    In this paper, we present the two new functions, the keyword submission function and the Web quiz function, for NOBASU. NOBASU is the Web-based learning management system (LMS) that has been developed by our research group to improve educational services in our department. The keyword submission function requests students to submit three keywords in each class before and after the class from the course materials so as to encourage them to prepare and review it. These keywords are disclosed to all the students after the submission deadline so that they can refer them for self-study. The Web quiz function enables students to take short tests about contents in classes on NOBASU. The test results are automatically graded after the student submits them. The teacher can easily register a new Web quiz by uploading a CSV file that describes the questions and the answers following the newly defined format. This CSV file can be completed at any place without Internet connections. We have implemented the two functions and have applied them to one class for freshmen at Department of Communication Network Engineering in Okayama University. From the results of the questionnaire from students about their usability, we confirm that they are very effective to improve motivations and understanding of students for this class.

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  • A Proposal of a Lecture Scene Playback System using Digital Picture-Card Show

    MOURI Aki, ISSHIKI Yosuke, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   107 ( 155 )   1 - 6   2007.7

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    In this paper, we propose a lecture scene playback system using the "digital picture-card show" to support the reviewing process of lectures by students. Our proposed system produces digital picture-cards by combining digital still fine images with their corresponding voices of the lecturer, and delivers them through the World-Wide Web system. We have implemented the system, and have applied it to one class for freshmen at Communication Network Department in Okayama University. From results of the questionnaire from students after using our system, we show that our system is effective to improve motivations and understanding of students for this class.

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  • An Implementation of Embedded Linux for Remote I/O System

    SHOJI Tomoya, KAWASHIMA Jun, FUNABIKI Nobuo, NAKANISHI Toru, IIJIMA Hideki, MAEDA Yasuyuki

    IEICE technical report   107 ( 36 )   73 - 76   2007.5

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    In recent years, Lin has been getting popularity as the operating system for embedded systems, due to its various software assets and robustness. Thus, we have studied the use of Linux in remote I/O systems for industries. In this paper, we present how to adopt Linux into a remote I/O system produced from M-system Ltd. and to implement device drivers so that Linux can control I/O boxes in a fixed cycle. The evaluation using our implementation shows the practicality of the remote I/O system with Linux.

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  • A Discussion of a Design Method of Hierarchical Chordal Ring Network for Multihop WDM Networks with Mesh Topology

    KITANI Tomoya, FUNABIKI Nobuo, HIGASHINO Teruo

    IEICE technical report   107 ( 36 )   7 - 12   2007.5

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    We have proposed a hierarchical logical topology called Hierarchical Chordal Ring Network (HCRN) on WDM multi-hop ring networks. HCRN achieves a smaller network diameter with a less number of wavelengths. In this paper, we propose a design method to configure HCRN on mesh networks. The problem of constructing a optical logical topology on WDM networks is an NP-hard combinatorial problem. Thus, we propose a heuristic algorithm to construct HCRN topology on mesh networks. We evaluate our algorithm by comparing the network performance indices with existing algorithms.

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  • A WDS Clustering Problem for Wireless Infrastructure Mesh Networks

    TAJIMA Shigeto, FUNABIKI Nobuo, HIGASHINO Teruo

    IEICE technical report   106 ( 577 )   323 - 328   2007.3

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    We have studied the Wireless Infrastructure Mesh NETwork(WIMNET) as a large-scale multihop wireless network. WIMNET is composed of multiple access points (APs) that have wireless connections with each other through Wireless Distribution System (WDS). Because the number of APs in a single WDS is limited due to the broadcast packet problem, the AP clustering for multiple WDS connections is necessary to construct a large-scale WIMNET. In this paper, we formulate this WDS clustering problem of APs for WIMNET and prove the NP-completeness of its decision version. Then, we present its heuristic algorithm where we evaluate our approach through simulations.

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  • An Implementation of an Anonymous IEEE802.1X Authentication with User Revocation

    MIKI KOUHEI, NAKANISHI TORU, KAWASHIMA JUN, FUNABIKI NOBUO

    IPSJ SIG Notes   2007 ( 16 )   129 - 134   2007.3

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    The IEEE802.1X authentication is used well as an authentication protocol in the Access Point for the Internet connection. There is a problem that mobile host's privacy information is leaked to the Internet service provider in this protocol. To solve this problem, we have proposed and implemented an anonymous authentication using the group signature. However, there is a problem that the user revocation is not considered. In this paper, an anonymous IEEE802.1X authentication with a user revocation is implemented by using a group signature with a user revocation function, and the authentication time is evaluated.

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  • Verifier-local revocation group signature schemes with backward unlinkability from bilinear maps

    Torn Nakanishi, Nobuo Funabiki

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E90A ( 1 )   65 - 74   2007.1

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    An approach of membership revocation in group signatures is verifier-local revocation (VLR for short). In this approach, only verifiers are involved in the revocation mechanism, while signers have no involvement. Thus, since signers have no load, this approach is suitable for mobile environments. Although Boneh and Shacham recently proposed a VLR group signature scheme from bilinear maps, this scheme does not satisfy the backward unlikability. The backward unlinkability means that even after a member is revoked, signatures produced by the member before the revocation remain anonymous. In this paper, we propose VLR group signature schemes with the backward unlinkability from bilinear maps.

    DOI: 10.1093/ietfec/e90-a.1.65

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  • A WDS clustering algorithm for wireless mesh networks

    Shigeto Tajima, Teruo Higashino, Nobuo Funabiki, Toru Nakanishi

    2007 IFIP INTERNATIONAL CONFERENCE ON WIRELESS AND OPTICAL COMMUNICATIONS NETWORKS   323 - +   2007

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    The wireless mesh network has been studied as an expandable wireless access network to the Internet. This paper focuses on the network composed of only access points (APs) that has multihop wireless connections with each other through Wireless Distribution System (WDS). Because the number of APs in a single WDS cluster is limited due to transmission loads of broadcasting control packets, the proper partition of APs for multiple WDS clusters is essential for its scale-up. In this paper, we formulate this WDS clustering problem, and prove the NP-completeness of its decision version through reduction from the bin packing problem. Then, we present its two-stage heuristic algorithm where we verify the effectiveness of our approach through extensive simulations.

    DOI: 10.1109/WOCN.2007.4284191

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  • A Proposal of a Group Siganture Scheme with Membership Revocation Using Prime Numbers and Its Implementation

    HAMADA Naoto, NAKAYAMA Takuya, NAKANISHI Toru, FUNABIKI Nobuo

    IEICE technical report   106 ( 411 )   47 - 54   2006.12

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    Group signature schemes with membership revocation have been intensively researched. In this paper, we propose a new group signature scheme where the computational cost for signing/verification is lower than an existing scheme without the update of signers' private keys. In the proposed scheme, a group manager issues the membership certificate with a unique prime number to every member of the group. A revocation of a membership certificate is performed by using this prime number. To show the practicality of the proposed scheme, we implemented the scheme on a PC, and measured the execution time. In a group with 1000 members, the signature signing/verification needs about 1.3 seconds. Since this time is less than half of the time that needed in the existing scheme, the practicality of the proposed scheme is sufficiently shown.

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  • Research on Making of Electronic Whiteboard Secure

    YASUKAWA Yukihiro, KOUMOTO Takuya, FUNABIKI Nobuo, SUGIYAMA Yuji

    IEICE technical report   106 ( 263 )   7 - 12   2006.9

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    It is not easy to see the screen from the back seat at conference with commodious room. To solve this problem, an electronic whiteboard system using the IP multicast communication can be used, but an existing system has the problem concerning security. In this research, an existing whiteboard system is made secure and extended to a practicable whiteboard. The whiteboard system is introduced into an actual conference, and effectiveness is shown by the questionnaire from users.

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  • 8-107 Development and Management of an WEB-based Educational Activity Support System "NOBASU" : For unification of education and research activities in university

    FUNABIKI Nobuo, NAGAO Noriaki, NAGATA Yoshinori, BABA Shota

    18   152 - 153   2006.7

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  • A design method for a multiplexed hierarchical logical topology to balance communication loads for multi-hop WDM networks and its routing algorithm

    KITANI Tomoya, FUNABIKI Nobuo, HIGASHINO Teruo

    IEICE technical report   106 ( 117 )   13 - 16   2006.6

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    In this paper, we propose a hierarchical topology and its routing algorithm to achieve traffic balancing. In a hierarchical topology, traffic concentrates on the link of high-level layers. Thus, we make the node group in the lowest level layer as a cluster, and set the links hierarchically between nodes as well as a high-level layer. By using these links, traffic is relaid to a far away node via the nodes in the low-level layer. We also propose the routing algorithm of this topology.

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  • An Improvement of License Plate Recognition Algorithm Considering Image Brightness and Character Arrangements

    SHINOHARA Yosuke, KAWASHIMA Jun, FUNABIKI Nobuo

    IEICE technical report   105 ( 534 )   7 - 12   2006.1

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    The automatic recognition of characters and numbers on license plates for vehicles is very important for various applications such as vehicle managements in parking lots, automatic fare collections in toll roads, traffic flow measurements and congestion surveillance on roads, and identifications of illegal parking vehicles on streets. In this paper, we propose an improvement of the license number plate recognition algorithm by improving the binarization process and the character recognition area process that are the keys determining the recognition accuracy. In the former process, the histogram of pixel brightness obtained from the input image is classified into three patterns according to the shape, and the different thresholds are used in each pattern. In the latter process, extractions of noisy character regions are enabled by extrapolating them from successfully extracted regions using their relative positions. The effectiveness of our proposal is verified by applications to sample license images.

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  • 無線メッシュネットワークにおけるゲートウェイ用アクセスポイント選択問題

    田島

    第3回アドホックネットワーク ワークショップ, Jan. 2006   2006

  • 最大重みクリーク問題に対する局所探索法

    片山謙吾, 濱本明宏, 貞松政史, 成久洋之, 南原英生, 舩曵信生

    電子情報通信学会論文誌A   2006

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  • メモリカードのためのセキュアファイルシステムSASの提案と実装

    川島潤, 舩曵信生, 中西透, 竹内 順一, 石崎 雅幸, Andre Caldas de Souza

    情報処理学会論文誌   2006

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  • プライバシを保護した授業評価アンケートの実装

    谷川浩司, 中西透, 舩曵信生

    電子情報通信学会技術研究報告   2006

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  • VNCプロクシのネットワーク負荷分散性能の評価

    松本康平, 籠谷裕人, 甲本卓也, 舩曵信生

    電子情報通信学会技術研究報告   2006

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  • A proposal of anonymous IEEE802.IX authentication protocol for wireless networks

    Nobuo Funabiki, Toru Nakanishi, Hideo Takahashi, Kouhei Miki, Jun Kawashima

    2006 SECOND WORKSHOP ON SECURE NETWORK PROTOCOLS (NPSEC)   26 - +   2006

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    Recently, wireless network services are available at a variety of public spaces such as stations, airports, and hotels. In such services, the IEEE802.1X-based authentication protocol has been often used to permit only registered users in network connections. However, this protocol allows Internet service providers (ISPs) to collect the privacy information of users such as their access locations and network service use records. Besides, ISPs have to keep in secret the personal information of their users for authentication, although they only need the legitimacy of them. To solve these problems. this paper presents an anonymous authentication protocol based on IEEE802.1X. The group signature scheme is adopted to anonymously verify the legitimacy of users, whereas misbehaving users can be traced in case. We implement the proposed protocol by modifying open source soft-wares for IEEE802.1X and verify the effectiveness in terms of the processing time and the packet size.

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  • デジタル紙芝居システムのための配信経路生成アルゴリズムの提案

    毛利亜紀, 篠原陽介, 舩曵信生, 中西透

    電子情報通信学会技術研究報告   2006

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  • An optimal access-point allocation for wireless infrastrcuture mesh netwroks

    Nobuo Funabiki, Toru Nakanishi, Yohei Nomura, Tamer Farag, Shigeto Tajima, Teruo Higashino

    Proc. of 16th International Conference on Computer Theory and Applications   2006

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  • 無線メッシュネットワークのアクセスポイント間通信での優先度制御に関する一検討

    野村洋平, 新田友里子, 田島滋人, 舩曵信生, 中西透

    電子情報通信学会技術研究報告   2006

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  • 無線メッシュネットワークでの帯域測定実験とその考察

    加藤秀明, 野村洋平, 舩曵信生, 中西透

    電子情報通信学会技術研究報告   2006

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  • 無線メッシュネットワークにおけるアクセスポイントのチャネル割当アルゴリズムの提案と配置アルゴリズムの評価

    野村洋平, 舩曵信生, 中西透

    第3回アドホックネットワークワークショップ   2006

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  • An internet gateway access-point selection problem for wireless infrastructure mesh networks

    Shigeto Tajima, Teruo Higashino, Nobuo Funabiki, Shoji Yoshida

    Proceedings - IEEE International Conference on Mobile Data Management   2006   2006

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    This paper presents a study of the gateway access-point selection problem for the wireless infrastructure mesh network (WIMNET). WIMNET is a wireless mesh network composed of multiple access-points (APs) that communicate mutually using radio transmissions, and all the traffics to/from the Internet go through the limited number of gateway APs. Thus, the selection of these gateway APs often determines the whole performance of WIMNET, because heavy congestions at gateway APs and their peripheries can drastically increase the delay and the link failure due to radio interferences. In this paper, we define a cost function to minimize the total traffic in WIMNET in order to reduce congestions and present a simple algorithm. Through simulations using the newly developed WIMNET simulator, we show the effectiveness of our approach. © 2006 IEEE.

    DOI: 10.1109/MDM.2006.36

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  • WDMリングネットワークのノード構成問題の一般化

    磯貝愛, 舩曵信生, 中西透

    電子情報通信学会技術研究報告   2006

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  • A LECCS model parameter optimization algorithm for EMC designs of IC/LSI systems

    Nobuo Funabiki, Yohei Nomura, Jun Kawashima, Yuichiro Minamisawa, Osami Wada

    2006 17TH INTERNATIONAL ZURICH SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY, VOLS 1 AND 2   304 - +   2006

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    In this paper, we propose a parameter optimization algorithm for EMC macro-modeling of IC/LSI power currents called the LECCS (Linear Equivalent Circuit and Current Source) model. The unnecessary electro-magnetic wave from a digital electronics device may cause the electromagnetic interference (EMI) to other apparatus. Thus, its reduction has been regarded as one of the highest priority issues in digital electronics device designs. In order to accurately simulate high-frequency currents from power-supply sources that are the primary sources of EMI, the LECCS model has been proposed as a linear macro-model of a power-supply circuit. A LECCS model consists of multiple RLC-series circuits in parallel to represent the equivalent circuit between the voltage source and the ground. Given a set of measured impedances at various frequencies, our proposed algorithm first finds the number of RLC-series circuits corresponding to the number of valleys. Then, it searches optimal values of RLC parameters by a local search method. The effectiveness of our algorithm is verified through applications to a real system, where the accuracy and the required processing time by our algorithm are compared with the conventional method.

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  • WEBによる教育支援システム"NOBASU"での課題プログラム評価

    馬場章太, 長尾憲暁, 中西透, 舩曵信生

    情報処理学会研究報告   2006

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  • VNCにおける負荷分散と操作権限制御を目的としたプロクシの提案

    松本康平, 籠谷裕人, 甲本卓也, 舩曵信生

    電子情報通信学会技術研究報告   2006

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  • 複数ネットワークインターフェースを有するエンドホストでのサービス指向型ルーティングの実装

    東根俊, 川島潤, 舩曵信生, 中西透

    電子情報通信学会技術研究報告   2006

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  • 無線メッシュネットワークのためのWIMENTシミュレータの開発

    吉田翔志, 舩曵信生, 中西透

    第3回アドホックネットワークワークショップ   2006

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  • PeerCastをベースとしたマルチメディア配信システムPeerStreamの構築とその評価

    斎藤正隆, 磯貝愛, 甲本卓也, 舩曵信生

    電子情報通信学会技術研究報告   2006

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  • アプリケーションレベルマルチキャスト通信におけるマルチホーム化ホスト選択アルゴリズムの改良

    加藤秀明, 川島潤, 舩曵信生, 中西透

    電子情報通信学会技術研究報告   2006

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  • An optical-drop wavelength assignment algorithm for efficient wavelength reuse under heterogeneous traffic in WDM ring networks

    N Funabiki, J Kawashima, T Nakanishi, K Okayama, T Higashino

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E88A ( 5 )   1234 - 1240   2005.5

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    The wavelength-division multiplexing (WDM) technology has been popular in communication societies for providing very large communication bands by multiple lightpaths with different wavelengths on a single optical fiber. Particularly, a double-ring optical network architecture based on the packet-over-WDM technology such as the HORNET architecture, has been extensively studied as a next generation platform for metropolitan area networks (MANs). Each node in this architecture is equipped with a wavelength-fixed optical-drop and a fast tunable transmitter so that a lightpath can be established between any pair of nodes without wavelength conversions. In this paper, we formulate the optical-drop wavelength assignment problem (ODWAP) for efficient wavelength reuse under heterogeneous traffic in this network, and prove the NP-completeness of its decision problem. Then, we propose a simple heuristic algorithm for the basic case of ODWAP. Through extensive simulations, we demonstrate the effectiveness of our approach in reducing waiting times for packet transmissions when a small number of wavelengths are available to retain the network cost for MANs.

    DOI: 10.1093/ietfec/e88-a.5.1234

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  • A Link Activation Scheduling Algorithm Considering Transmission Success Rates in Packet Radio Networks

    TAJIMA Shigeto, FUNABIKI Nobuo, HIGASHINO Teruo

    2005 ( 2 )   81 - 86   2005.1

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    In packet radio networks such as wireless local areas networks and ad-hoc mobile networks, periodic activations of the communication links between adjacent hosts by following the conflict-free link activation schedule is effective to realize the multi media streaming of motion pictures and voices. For better schedules, success rates of link activations should be considered, because packets may be lost before reaching receiving hosts when transmission path conditions are not good, even though these communication hosts are located within the range of radio transmissions. In this paper, we present a link scheduling algorithm for periodic link activations in packet radio networks when the transmission success rate is given for every link. In this algorithm, the number of activation times in one cycle is calculated for each link beforehand that satisfies the minimum success rate, and the schedule of activating the link by this number without conflict is found. Through simulations in randomly generated instances, we show that the schedule by our algorithm can reduce the total transmission time required to complete packet transmissions.

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  • A proposal of an access-point allocation algorithm for WDS in wireless LAN

    KUMANO Eiji, MITANI Chie, FUNABIKI Nobuo, NAKANISHI Toru

    2005 ( 2 )   45 - 50   2005.1

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    The wireless distribution system (WDS) provides wireless connections between multiple access points (APs) to compose a large-scale wireless local area network (WLAN). In this paper, we formulate the AP allocation problem for WDS, and present its two-stage heuristic algorithm. In this problem, a feasible allocation of APs is requested, such that the total number of APs is not only minimized, but also the load of each AP is equalized. The proposed algorithm consists of the first stage of allocating APs in a regular interval and the second stage of improving their allocations by random perturbations. The effectiveness of our algorithm is confirmed through simulations in two host movement models, namely random waypoint model (RWM) and seating space model (SSM). This newly presented SSM assumes a seating space of shops, restaurants, and event fields, so that it can simulate more realistic situations.

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  • A License Plate Recognition Algorithm Using Cross Count and Template Matching Methods

    SHINOHARA Yosuke, FUNABIKI Nobuo, KAWASHIMA Jun, TAKEUCHI Junichi, ISHIZAKI Masayuki

    Technical report of IEICE. PRMU   104 ( 573 )   39 - 44   2005.1

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    The automatic recognition of characters and numbers on license plates for vehicles is very important for various applications such as vehicle managements in parking lots, automatic fare collections in toll roads, traffic flow measurements and congestion surveillance on roads, and identifications of illegal parking vehicles on streets. In this paper, we propose a license number plate recognition algorithm from digital color images, using the cross count method for character recognitions and the template matching method for number recognitions. Since input images for this algorithm are usually taken in fields manually, and have deformations and effects by shadows, we adopt an adaptive threshold adjustment mechanism for binarization of images in order to deal with undesirable situations. Besides, we introduce an automatic generation method of representative vectors for the cross count method, so that it can handle the increase of complex Chinese characters on license plates. We show that the proposed algorithm provides the 100% success rate for noiseless images taken from an WEB site and the 80% success rate for noisy images taken by a PDA camera.

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  • An Improvement of a Tooth Contour Extraction Method and a Tooth Contour Database Design Based on WEB Applications

    SU Tie, FUNABIKI Nobuo, KISHIMOTO Etuo

    Technical report of IEICE. PRMU   104 ( 573 )   31 - 36   2005.1

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    In recent years, various image-processing technologies have been applied in the field of dentistry, in which, a tooth contour extraction method is strongly expected for the dental treatment and tooth shape classification. At the same time, designing a database based on the extraction result is helpful for the tooth statistical analysis aimed at the clinical treatment. In this paper, a tooth contour extraction method based on deformable template matching is introduced, and its improvement in the automatic threshold adjusting algorithm for cutting gum region around the tooth is proposed. The simulation results using sample images show that the tooth region is separated from the input image by the detected threshold automatically. Then, a tooth contour database design based on WEB applications is proposed to support dental diagnoses. Using the definitions of tooth shape features, the database will be useful in analyzing the difference of tooth shapes according to age, sex, and regions.

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  • A proposal of an access-point allocation algorithm for WDS in wireless LAN

    KUMANO Eiji, MITANI Chie, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report   104 ( 553 )   45 - 50   2005.1

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

    The wireless distribution system (WDS) provides wireless connections between multiple access points (APs) to compose a large-scale wireless local area network (WLAN). In this paper, we formulate the AP allocation problem for WDS, and present its two-stage heuristic algorithm. In this problem, a feasible allocation of APs is requested, such that the total number of APs is not only minimized, but also the load of each AP is equalized. The proposed algorithm consists of the first stage of allocating APs in a regular interval and the second stage of improving their allocations by random perturbations. The effectiveness of our algorithm is confirmed through simulations in two host movement models, namely random waypoint model (RWM) and seating space model (SSM). This newly presented SSM assumes a seating space of shops, restaurants, and event fields, so that it can simulate more realistic situations.

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  • A Link Activation Scheduling Algorithm Considering Transmission Success Rates in Packet Radio Networks

    TAJIMA Shigeto, FUNABIKI Nobuo, HIGASHINO Teruo

    IEICE technical report   104 ( 553 )   81 - 86   2005.1

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

    In packet radio networks such as wireless local areas networks and ad-hoc mobile networks, periodic activations of the communication links between adjacent hosts by following the conflict-free link activation schedule is effective to realize the multi media streaming of motion pictures and voices. For better schedules, success rates of link activations should be considered, because packets may be lost before reaching receiving hosts when transmission path conditions are not good, even though these communication hosts are located within the range of radio transmissions. In this paper, we present a link scheduling algorithm for periodic link activations in packet radio networks when the transmission success rate is given for every link. In this algorithm, the number of activation times in one cycle is calculated for each link beforehand that satisfies the minimum success rate, and the schedule of activating the link by this number without conflict is found. Through simulations in randomly generated instances, we show that the schedule by our algorithm can reduce the total transmission time required to complete packet transmissions.

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  • A Proposal of a WWW-Based Support System for Class Arrangements to English Teachers (ECASOU)

    TAKAHASHI Noriyuki, FUNABIKI Nobuo, YANO Masaaki

    The IEICE transactions on information systems Pt. 1   88 ( 1 )   89 - 98   2005.1

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  • マルチホップ WDM ネットワークにおけるトラヒック分散のための静的トポロジ構成法の改善

    木谷友哉, 舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告, NS2005-76   2005

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  • Optical-drop wavelength assignment problem for wavelength reuse in WDM ring metropolitan area networks

    N Funabiki, M Isogai, T Nakanishi, T Higashino

    19TH INTERNATIONAL CONFERENCE ON ADVANCED INFORMATION NETWORKING AND APPLICATIONS, VOL 1, PROCEEDINGS   999 - 1004   2005

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    This paper presents a formulation of the optical-drop wavelength assignment problem (ODWAP) and its heuristic algorithm for WDM ring networks. The wavelength-division multiplexing (WDM) technology has been popular in communication societies for providing very large communication bands by multiple lightpaths with difterent wavelengths on a single optical fiber Particularly, a double-ring optical network architecture based on the packet-over-WDM technology such as the HORNET architecture, has been studied as a next generation platform for metropolitan area networks (MANs). Each node in this architecture is equipped with a wavelength-fixed optical-drop and a tunable transmitter so that a lightpath can be established between any pair, of nodes without wavelength conversions. In this paper we formulate ODWAP for efficient wavelength reuse under heterogeneous traffic in this network. Then, we propose a simple heuristic algorithm for ODWAP. Through extensive simulations, we demonstrate the effectiveness of our approach in reducing waiting times for packet transmissions when a small number of wavelengths are available to retain the network cost for MANs.

    DOI: 10.1109/AINA.2005.267

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  • モバイルホストのユーザ情報を秘匿するアドレス配信プロトコルの提案

    高橋秀郎, 川島潤, 中西透, 舩曵信生

    情報処理学会研究報告, 2005-CSEC-28   2005

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  • メモリカードのためのセキュアファイルシステムSASの提案

    川島潤, 舩曵信生, 中西透, 竹内順一, 石崎雅幸, Andre Caldasde Souza

    電子情報通信学会技術研究報告, OIS2005-05   2005

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  • アプリケーションレベルマルチキャスト通信における伝送遅延モデルの一考察

    永田佳範, 川島潤, 舩曵信生, 中西透

    電子情報通信学会技術研究報告, NS2005-61   2005

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  • アプリケーションレベルマルチキャストにおけるマルチホーム化ホスト選択アルゴリズムの提案

    加藤秀明, 川島潤, 舩曵信生, 中西透

    電子情報通信学会技術研究報告, NS2005-62   2005

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  • WDMネットワークにおける階層型コーダルリングトポロジ構成法

    木谷友哉, 舩曵信生, 東野輝夫

    情報処理学会論文誌   2005

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  • WDMリングネットワークのノード構成問題

    磯貝愛, 舩曵信生, 中西透

    電子情報通信学会技術研究報告, NS2005-91   2005

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  • アプリケーションレベルマルチキャストにおける遠隔講義のための複数経路木生成法の提案

    東根俊, 川島潤, 舩曵信生, 中西透

    電子情報通信学会技術研究報告, NS2005-63   2005

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  • 無線LANのアクセスポイント配置アルゴリズムの改良

    野村洋平, 舩曵信生, 中西透

    電子情報通信学会技術研究報告, NS2005-73   2005

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  • 無線LANのWDSにおけるAP間通信へのリンクスケジューリングアルゴリズムの適用

    田島滋人, 舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告, NS2005-74   2005

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  • アプリケーションレベルマルチキャスト経路木アルゴリズムCT+法の提案とマルチホーム環境の効果

    磯貝愛, 舩曵信生, 中西透

    電子情報通信学会論文誌D-Ⅰ   2005

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  • Group signature schemes with membership revocation for large groups

    T Nakanishi, F Kubooka, N Hamada, N Funabiki

    INFORMATION SECURITY AND PRIVACY, PROCEEDINGS   3574   443 - 454   2005

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    Group signature schemes with membership revocation have been intensively researched. However, signing and/or verification of some existing schemes have computational costs of O(R), where R is the number of revoked members. Existing schemes using a dynamic accumulator or a similar technique have efficient signing and verifications with 0(l) complexity. However, before signing, the signer has to modify his secret key with O(N) or O(R) complexity, where N is the group size. Therefore, for larger groups, signers suffer from enormous costs. On the other hand, an efficient scheme for middle-scale groups with about 1,000 members is previously proposed, where the signer need not modify his secret key. However this scheme also suffers from heavy signing/verification costs for larger groups. In this paper, we adapt the middle-scale scheme to the larger groups. At the sacrifice of the group manager's cost, our signing/verification has only O(1) complexity.

    DOI: 10.1093/ietfec/e89-a.5.1275

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  • 仮想OSを用いたセキュアなプログラミング課題検証支援システム

    長尾憲暁, 舩曵信生, 中西透

    電子情報通信学会技術研究報告, ET2005-45   2005

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  • 階層型コーダルリングネットワークにおけるコンパクトルーティングアルゴリズム

    木谷友哉, 舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告, NS2005-145   2005

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  • A proposal of a node configuration algorithm for WDM ring networks

    Megumi Isogai, Nobuo Funabiki, Toru Nakanishi, Teruo Higashino

    Proc. of International Conference on Optical Communications and Networks (ICOCN-2005)   2005

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  • Compact tree plus algorithms for application-level multicast communications in multihome networks

    N Funabiki, M Isogai, T Nakanishi, T Higashino

    2005 13TH IEEE INTERNATIONAL CONFERENCE ON NETWORKS JOINTLY HELD WITH THE 2005 7TH IEEE MALAYSIA INTERNATIONAL CONFERENCE ON COMMUNICATIONS, PROCEEDINGS 1 AND 2   139 - 144   2005

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    Application-level multicast (ALM) communications replicate packets on host level to deliver them from a single source to multiple clients, so that it can efficiently realize a variety or network applications using moving pictures such as video conferences, distance learning, and video-on-demands. In this paper, we propose the CT+ (Compact Tree Plus) algorithm for finding a better ALM routing tree in terms of delay minimization between hosts. CT+ consists of a tree construction stage from the existing CT algorithm, and a newly added iterative tree improvement stage. Then, we define the extended ALM routing problem and its heuristic algorithm ExCT+, to optimize the effectiveness of the multihome network in ALM communications by selecting multihomed hosts and connections in the ALM routing tree simultaneously. For their evaluations, we construct a network simulation model named MINET (Multiple-ISP NETwork simulator), where the topology is composed of multiple ISP backbone networks with IX connections, and the network traffic is generated by following the M/M/1 queuing process. The simulation results using MINET verify the effectiveness of our algorithms.

    DOI: 10.1109/ICON.2005.1635456

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  • A proposal of a panoramic image synthesizing algorithm using an optimization method

    ISOGAI Megumi, FUNABIKI Nobuo, KOUMOTO Takuya, SUGIYAMA Yuji, OZAKI Ryo, OKAMOTO Takuji

    104 ( 512 )   17 - 24   2004.12

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    Recently, a panoramic image has been expected in applications to various monitoring systems and virtual space presentation systems due to the advantage of expressing a wide range of scenes by one image. In this paper, we propose a panoramic image synthesizing algorithm for a panoramic image generating system to monitor indoor scenes, which is composed of,one personal computer and three inexpensive cameras set in row. This system has been studied in our group with the view of applications to home/store monitoring and safety confirmation of seniors living alone. The proposed algorithm consists of the approximate calibration stage and the detailed calibration stage, to fit images from side cameras to the image of the central camera as best as possible. The first stage transforms the coordinates of the side image to resolve the difference caused by view directions and locations of cameras, where the parameters are calculated using the limited number of feature points in overlapped regions of two images. The second stage applies both the coordinate transformation and the color correction with the parameters calculated using every pixel in overlapped regions. In both stages, parameters are searched by a local search method that is a typical optimization method. Through experiments with a variety of still images taken in our office, we show the effectiveness of our proposed algorithm.

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  • A proposal of a parameter optimization algorithm for LECCS : EMC macro-modeling of IC/LSI power current

    NOMURA Yohei, KAWASHIMA Jun, FUNABIKI Nobuo, TOYOTA Tomohiro, MINAMISAWA Yuichirou, WADA Osami

    IEICE technical report. Electromagnetic compatibility   104 ( 499 )   71 - 76   2004.12

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    In this paper, we propose a parameter optimization algorithm for the EMC macro-modeling of IC/LSI power currents called the LECCS (Linear Equivalent Circuit and Current Source) model. The unnecessary electro-magnetic wave from a digital electric device causes an electromagnetic interference to other apparatus, and thus, its reduction has been emphasized as one of the highest priority issues in digital electric device design societies. In order to simulate accurately high frequency current from the power-supply system in IC/LSIs that is its primary resource, the LECCS model has been proposed as a linear macro-model of a device power-supply circuit. In the LECCS model, the circuit between the power supply and the ground in a circuit is described as a combination of RLC-series circuits in parallel. Given a set of measured impedances at various frequencies, our algorithm first finds the number of .RLC-series circuits from the number of valleys, and then, it searches optimal values of RLC parameters by the local search method. The validity of our algorithm is verified through applications to the results of a real device where the accuracy and the required processing time in our result are compared with those by the manual model tuning.

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  • A Group Signature Scheme with Membership Revocation for Large Groups

    KUBOOKA Fumiaki, NAKANISHI Toru, FUNABIKI Nobuo

    IEICE technical report. Office Information Systems   104 ( 423 )   27 - 34   2004.11

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    Some group signature schemes with membership revocation were proposed. In a scheme using an accumulator, the computation cost is O (1) but the communication cost is O (Kln), where K is the group size, and in is the size of the RSA modulus. On the other hand, a scheme is more efficient for only groups with the size ln and the communication cost is only O (K) though the computation cost is O (K/ln). Thus, these schemes are not efficient for large groups. In this paper, by combining these schemes, we propose an efficient group signature scheme with membership revocation for large groups. In the proposed scheme, the computation cost is O (1) and the communication cost is O (K).

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  • A study of a WEB-based educational service support system for lectures and exercises in universities

    TAKAHASHI Noriyuki, FUNABIKI Nobuo, NAKANISHI Toru

    IEICE technical report. Education technology   104 ( 342 )   45 - 50   2004.10

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    This paper presents a Web-based education supporting system for lectures and exercises in universities, named NOBASU (NetwOrk-Based Assistant System for University education). The use of WWW (World-Wide Web) technology has been effective in improving the quality of educational services in universities while alleviating the increase of burdens by teachers. Actually, several education supporting systems using WWW technology have been developed recently, which have been introduced by more and more universities. We have developed an original education supporting system that is suitable for lectures and exercises in our department. We are now implementing this NOBASU system using JSP/Servlet mainly, and soon we will apply it to lectures in our department.

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  • A minimum dead space algorithm for generalized isochronous channel reuse problems in DQDB networks

    N Funabiki, J Kawashima, K Okayama, T Nakanishi, T Higashino

    IEICE TRANSACTIONS ON COMMUNICATIONS   E87B ( 9 )   2692 - 2698   2004.9

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    With the explosive growth of the Internet system, demands for broadband communication networks have rapidly increased to provide high quality network services. For this purpose, the IEEE 802.6 MAC standard protocol defines the distributed-queue dual bus (DQDB) for metropolitan area networks (MANs). The isochronous channel reuse problem (ICRP) has been studied for efficient use of DQDB by finding proper channel assignments to incoming connection requests. In this paper, we first define the generalized isochronous channel reuse problem (GICRP) as a generalization of ICRP, to afford demands of simultaneously satisfying plural connection requests such as for multicast applications, where certain sets of connection requests must be assigned channels simultaneously. We prove the NP-completeness of its decision problem. Then, we propose a minimum dead space (MDS) algorithm as a heuristic approach to GICRP. The extensive simulation results show that with shorter computation time, our MDS algorithm can always find better channel assignments reducing the waiting time for packet transmissions than the best existing algorithm for conventional ICRP.

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  • An Electronic Weighted Voting Protocol with Tallying Cost Reduced

    NAKATAKE Shinji, NAKANISHI Toru, FUNABIKI Nobuo, SUGIYAMA Yuji

    IPSJ SIG Notes   2004 ( 75 )   329 - 334   2004.7

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    A weighted voting is a system such that a voter submits a vote with a weight, e.g・, voting in stockholders' meetings. A weighted voting protocol that can keep weights secret has been proposed. However, this protocol has a problem that a tallying cost is large when there are many voters, since a management server must re-encrypt and permute all votes. In this paper, we propose a weighted voting protocol with tallying cost reduced.

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    Other Link: http://id.nii.ac.jp/1001/00044919/

  • An Electronic Weighted Voting Protocol with Tallying Cost Reduced

    NAKATAKE Shinji, NAKANISHI Toru, FUNABIKI Nobuo, SUGIYAMA Yuji

    Technical report of IEICE. ISEC   104 ( 200 )   135 - 140   2004.7

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    A weighted voting is a system such that a voter submits a vote with a weight, e.g., voting in stockholders' meetings. A weighted voting protocol that can keep weights secret has been proposed. However, this protocol has a problem that a tallying cost is large when there are many voters, since a management server must re-encrypt and permute all votes. In this paper, we propose a weighted voting protocol with tallying cost reduced.

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  • Route securement by introduction of relay antennas for adhoc networks

    MITANI Chie, KUMANO Eiji, FUNABIKI Nobuo, NAKANISHI Toru

    Technical report of IEICE. RCS   104 ( 185 )   59 - 62   2004.7

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    An adhoc network is a network composed of mobile hosts, where hosts communicate with each other by the capability of wireless connections without using base stations or wireless hubs. When hosts are located in the neighborhod, they communicate with each other directly. When they are located distantly, their intermediate hosts relay the packets. The adhoc network, however, does not function as a network when such intermediate hosts do not exist to relay packets. In this paper, we propose the introduction of relay antennas to secure a route between any pair of hosts located at any place. Besides, we proposed a routing algorithm of selecting a commuication route that consists of desirable hosts with less future movility and smaller transmission loads. We evelaute the effect of these proposals through simulations using the random waypoint model.

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  • P2PMM router: A two-stage heuristic algorithm to peer-to-peer multicast routing problems in multihome networks

    N Funabiki, J Kawashima, S Yoshida, K Okayama, T Nakanishi, T Higashino

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E87A ( 5 )   1070 - 1076   2004.5

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    A variety of real-time multicast applications such as video conferences. remote lectures, and video-on-demand have become in commonplace with the expansion of broadband Internet services. Due to nontrivial problems in the IP multicast technology, the peer-to-peer multicast technology (P2P-multicast) has emerged as a practical implementation, although its network resource utilization is less efficient. A multihome network has the potential of alleviating this inefficiency by providing flexibility in communication path selections for each host with multiple gateways to the Internet. This paper has first formulated the P2P-multicast routing problem in the multihome network, and has proved the NP-completeness of its decision problem. Then, a two-stage heuristic algorithm called P2PMM_router has been presented for this P2P Multicast Multihome-network routing problem. The first stage constructs an initial multicast routing tree from an optimum spanning tree by Prim algorithm. through satisfying the constraints. The second stage improves the tree by repeating partial modifications and constraint satisfactions. The extensive simulation results using random network instances support the effectiveness of our P2PMM_router.

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  • A WEB-based supporting system for class assignments to English teachers

    TAKAHASHI Noriyuki, FUNABIKI Nobuo, YANO Masaaki

    IEICE technical report. Education technology   103 ( 697 )   23 - 27   2004.2

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    This paper presents a WEB-based supporting system for class assignments to English teachers in Okayama University. Currently, this assignment of class times and subjects to English teachers has been handled manually, after the preference data for them are provided on paper from teachers, which takes costs and long time. In our proposed system, the requests can be input by English teachers through their browsers, and the assignment is automatically computed on a server computer. For this purpose, we develop a heuristic algorithm for this class assignment problem after defining the formulation as a combinatorial optimization problem. By using real preference data by teachers, we compare assignment results between our method and the conventional one. The result shows the superiority of our method in terms of the assignment quality and the required process time.

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  • A perfect k-ary peer-to-peer multicast routing tree search algorithm for multihome networks

    KAWASHIMA Jun, FUNABIKI Nobuo, OKAYAMA Kiyohiko

    Technical report of IEICE. OCS   103 ( 627 )   5 - 8   2004.1

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    In this paper, we present a two-stage heuristic algorithm for the peer-to-peer multicast routing problem in a multihome network. This problem requires finding a multicast routing tree satisfying the delay constraint between any two hosts and the degree constraint of any host while minimizing the total cost of the tree. In our algorithm, the routing tree topology is fixed to the perfect k-ary tree so as to always satisfy the degree constraint while minimizing the maximum hop count between hosts. The first stage of the algorithm greedily constructs an initial tree of minimizing the cost, and the second stage iteratively searches a feasible tree based on the annealing method. Through simulations using random network instances, we compare the performance of our algorithm to that of a similar existing algorithm.

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  • A Proposal of a Tooth Contour Extraction Method Using Deformable Template Matching

    NYUNOYA Yoshinori, FUNABIKI Nobuo, KISIMOTO Etuo

    Technical report of IEICE. PRMU   103 ( 585 )   43 - 48   2004.1

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    Our group has studied contour extraction methods for various face components such as lips and eyes from digital face images using the deformable template matching method. In our method, each template expressing a contour is composed of fixed number of simple mathematical functions including quadratic functions. This simple template enables us to compare component contours of various persons and to analyze statistical features of them through processing the limited number of parameters. In this paper, we propose a tooth contour extraction method using the deformable template matching, where the template is composed of four elliptic curves. Our method optimizes the parameters of the template by a local search method so that it is best fit to the edge image of a tooth, after automatically identifying the tooth region from a given teeth image. We describe the details of the proposed algorithm and show simulation results for several sample images.

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  • A minimum dead space algorithm for wavelength reuse problems in WDM ring networks

    Nobuo Funabiki, Toru Nakanishi, Yoshitaka Toyota, Jun Kawashima, Teruo Higashino

    Proc. of International Conference on Optical Communications and Networks (ICOCN-2004)   2004

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  • 無線ネットワークのリンクスケジューリング問題に対するヒューリスティック解法の提案

    田島滋人, 舩曵信生, 東野輝夫

    情報処理学会論文誌, vol. 45, no. 2   2004

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  • A proposal of hierarchical chordal ring network topology for WDM networks

    T Kitani, N Funabiki, T Higashino

    2004 12TH IEEE INTERNATIONAL CONFERENCE ON NETWORKS, VOLS 1 AND 2 , PROCEEDINGS   605 - 609   2004

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    This paper presents a hierarchical chordal ring network topology (HCRN) as a regular logical topology for multihop WDM networks. In order to minimize the traffic increase and the transmission delay through the network due to packet relays or hops on intermediate nodes in the multihop network, the network topology is hierarchically constructed in HCRN, so that more lightpaths are assigned to connections between nearby nodes than those for distant nodes, while the maximum hop between any pair of nodes is restrained. This hierarchical topology is also beneficial to reduce the number of required wavelengths through increasing their reuses by multiple lightpaths, which is important for cost-conscious metropolitan area networks. Through comparisons on the network diameter and the number of required wavelengths with the original chordal ring network topology, we show the effectiveness of our proposed HCRN.

    DOI: 10.1109/ICON.2004.1409241

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  • A Proposal of Improved Lip Contour Extraction Method Using Deformable Template Matching and Its Application to Dental Treatment

    YOKOGAWA Yujin, FUNABIKI Nobuo, HIGASHINO Teruo, ODA Masashi, MORI Yoshihide

    IEICE transactions on information and systems   86 ( 8 )   1474 - 1474   2003.8

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  • A proposal of a two-stage heuristic algorithm for peer-to-peer multicast routing problems in multihome networks

    Nobuo Funabiki, Jun Kawashima, Akihito Kubo, Kiyohiko Okayama, Teruo Higashino

    Proc. of The Fifth Metaheuristics International Conference (MIC-2003)   2003

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  • A two-stage hierarchical algorithm for wavelength assignment in WDM-based bidirectional Manhattan Street Networks

    T Kitani, M Yonedu, N Funabiki, T Nakanishi, K Okayama, T Higashino

    ICON 2003: 11TH IEEE INTERNATIONAL CONFERENCE ON NETWORKS   419 - 424   2003

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    Wavelength Division Multiplexing (WDM) technology provides a wideband communication networks by realizing multiple communication channels with different wavelengths on a single optical fiber. In this technology, each node (wavelength router) has a finite number of transmitters/receivers dealing with different wavelengths, where each wavelength is exclusively used for the communication channel between a specific pair of nodes. Thus, some transmission request may require multiple wavelengths going through several nodes before reaching its destination. As a result, the wavelength assignment to nodes is very important for efficient transmission in WDM-based networks. Among regular wavelength assignment topologies, Bidirectional Manhattan Street Network (BMSN) gives high performance to WDM-based networks. In this paper, we present a two-stage heuristic algorithm for the wavelength assignment in BMSN, called a HIWAS (HIerarchical Wavelength ASsignment algorithm for BMSN). The first stage of HIWAS finds an initial wavelength assignment hierarchically, not only to avoid a local minimum as best as possible but also to reduce the time complexity. The second stage improves the wavelength assignment by adopting the simulated annealing. The performance of HIWAS is verified through solving two types of random instances, where HIWAS provides a better solution with a shorter time than the best-known existing algorithm.

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  • Deformable-Templateマッチング法による眼の輪郭線抽出に関する研究

    小田政志, 舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告, PRMU2003-140   2003

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  • A proposal of a minimal-state processing search algorithm for link scheduling problems in packet radio networks

    S Tajima, N Funabiki, A Sugano, T Higashino

    2003 SYMPOSIUM ON APPLICATIONS AND THE INTERNET, PROCEEDINGS   128 - 135   2003

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    In a large scale communication network, packets are transmitted from source nodes to destinations by going through several nodes on routes connecting them, because each node usually does not have a direct link to every node in the network. To maximize the usability in the network, the problems of selecting a transmission route for each connection request and of scheduling the link activations such that the total transmission time is minimized. This paper presents a four-stage approximation algorithm for the link scheduling problem (LSP) in a packet radio network, called MIPS-LSP, a MInimal-state Processing Search algorithm for LSR It is assumed that every link activation in the network is synchronously controlled by a single clock with a fixed time interval called a time slot. The first stage of MIPS-LSP computes the lower bound on the number of time slots for a given LSP instance. The second stage generates a link compatibility graph to represent the conflicts between links to be activated simultaneously. The third stage gives the initial state for search by a greedy method. The last stage iteratively searches a solution by a minimal-state evolution method. The performance of the algorithm is verified through extensive simulations using benchmarks in literature.

    DOI: 10.1109/SAINT.2003.1183041

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  • 双方向マンハッタンストリートネットワークのノード配置問題に対する階層型近似アルゴリズムの提案

    米津正隆, 舩曵信生, 木谷友哉, 横平徳美, 中西透, 東野輝夫

    電子情報通信学会論文誌D-I   2003

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  • A proposal of a minimal-state processing search algorithm for isochronous channel reuse problems in DQDB networks

    N Funabiki, A Sugano, T Higashino

    AINA 2003: 17TH INTERNATIONAL CONFERENCE ON ADVANCED INFORMATION NETWORKING AND APPLICATIONS   229 - 232   2003

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    The IEEE 802.6 MAC standard protocol defines the distributed-queue dual bus (DQDB) for metropolitan area networks (MANs). The isochronous channel reuse problem (ICRP) has been studied for the efficient use of DQDB. Given a set of established connections and a set of connection requests, the goal of ICRP is to maximize the number of satisfied requests by finding a proper channel assignment, such that no established connection is not only reassigned a channel, but also any pair of active connections does not interfere each other. In this paper, we propose a minimal-state processing search algorithm for ICRP (MIPS-ICRP). The simulation results show that MIPS-ICRP always provides near-optimum solutions.

    DOI: 10.1109/AINA.2003.1192877

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  • Deformable Templateマッチング法による唇輪郭抽出法の改良と歯科医療応用を目的とした評価

    横川勇仁, 小田政志, 舩曵信生, 東野輝夫, 森悦秀

    電子情報通信学会論文誌D-Ⅱ,vol. J86-D-Ⅱ, no.8   2003

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  • A Proposal of Test Sequence Generation Method for Communication Protocols Using SAT Algorithm

    MORI Takanori, OTSUKA Hirotaka, FUNABIKI Nobuo, NAKATA Akio, HIGASHINO Teruo

    IEICE transactions on information and systems   85 ( 11 )   1886 - 1887   2002.11

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  • A Method to Generate Test Sequences for FSM Protocols using SAT Algorithm

    2002 ( 15 )   75 - 80   2002.10

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  • A quasi-solution state evolution algorithm for channel assignment problems in cellular networks

    N Funabiki, T Nakanishi, T Yokohira, S Tajima, T Higashino

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E85A ( 5 )   977 - 987   2002.5

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    For efficient use of limited electromagnetic wave resource, the assignment of communication channels to call requests is very important in a cellular network. This task has been formulated as an NP-hard combinatorial optimization problem named the channel assignment problem (CAP). Given a cellular network and a set of call requests, CAP requires to find a channel assignment to the call requests such that three types of interference constraints between channels are not only satisfied, but also the number of channels (channel span) is minimized. This paper presents an iterative search approximation algorithm for CAP, called the Quasi-solution state evolution algorithm for CAP (QCAP). To solve hard CAP instances in reasonable time, QCAP evolutes quasi-solution states where a subset of call requests are assigned channels and no more request can be satisfied without violating the constraint QCAP is composed of three stages. The first stage computes the lower bound on the channel span for a given instance. After the second stage greedily generates an initial quasi-solution state, the third stage evolutes them for a feasible channel assignment by iteratively generating best neighborhoods, with help of the dynamic state jump and the gradual span expansion for global convergence. The performance of QCAP is evaluated through solving benchmark instances in literature, where QCAP always finds the optimum or near-optimum solution in very short time. Our simulation results confirm the extensive search capability and the efficiency of QCAP.

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  • Binary neural networks for N-queens problems and their VLSI implementations

    N Funabiki, T Kurokawa, M Ohta

    CONTROL AND CYBERNETICS   31 ( 2 )   271 - 296   2002

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    Language:English   Publisher:POLISH ACAD SCIENCES SYSTEMS RESEARCH INST  

    Combinatorial optimization problems compose an important class of mathematical problems that include a variety of practical applications, such as VLSI design automation, communication network design and control, job scheduling, games, and genome informatics. These problems usually have a large number of variables to be solved. For example, problems for VLSI design automation require several million variables. Besides, their computational complexity is often intractable due to NP-hardness. Neural networks have provided elegant solutions as approximation algorithms to these hard problems due to their natural parallelism and their affinity to hardware realization. Particularly, binary neural networks have great potential to conform to current digital VLSI design technology, because any state and parameter in binary neural networks are expressed in a discrete fashion. This paper presents our studies on binary neural networks to the N-queens problem, and the three different approaches to VLSI implementations focusing on the efficient realization of the synaptic connection networks. Reconfigurable devices such as CPLDs and FPGAs contribute the realization of a scalable architecture with the ultra highs speed of computation. Based on the proposed architecture, more than several thousands of binary neurons can be realized on one FPGA chip.

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  • ネットワークのリンクスケジューリングにおけるタイムスロット数下限値算出法の改善

    田島滋人, 舩曵信生, 東野輝夫

    マルチメディア,分散,協調とモバイルシンポジウム(DICOMO 2002)講演集   2002

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  • ユーザの移動情報を利用したモバイル・マルチキャストルーティング問題の一解法

    常村和史, 田島滋人, 中田明夫, 舩曵信生, 東野輝夫

    マルチメディア,分散,協調とモバイルシンポジウム(DICOMO 2002)講演集   2002

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  • Webバグに基づくファイルの不正開封検知システムの提案

    小林正憲, 舩曵信生, 中西透

    コンピュータセキュリティシンポジウム2002講演集   2002

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  • 通信プロトコルの試験系列生成問題に対するSATアルゴリズム適用法の提案

    森 亮憲, 大塚裕孝, 舩曵信生, 中田明夫, 東野輝夫

    電子情報通信学会論文誌D-I   2002

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  • 静的およびモバイル・マルチキャストルーティング問題に対する最適パス選択解法の提案

    藤井雅和, 舩曵信生, 横平徳美, 田島滋人, 常村和史, 東野輝夫

    電子情報通信学会論文誌A   2002

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  • A proposal of a quasi-solution state evolution algorithm for channel assignment problems

    Nobuo Funabiki, Tokumi Yokohira, Toru Nakanishi, Shigeto Tajima, Teruo Higashino

    Proc. of 16th international conference on information networking (ICOIN-16)   2002

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  • A Proposal of an Optimal Path Selection Algorithm for Static and Mobile Multicast Routing Problems

    FUJII M., FUNABIKI Nobuo, YOKOHIRA Tokumi, TAJIMA Shigeto, TSUNEMURA Kazufumi, HIGASHINO Teruo

    IEICE Journal   85 ( 3 )   730 - 730   2002

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    In this paper, we present an approximation algorithm called OPSAM (Optimal Path Selection Algorithm for Multicast) for the static multicast routing problem and the newly defined mobile multicast routing problem. Given a graph with the cost and the delay associated to each edge, a data source, a destination set, and the delay time limit, the first problem requires finding a multicast tree such that the total edge cost is not only minimized, but also the delay of any path from source to a destination does not surpass its limit. OPSAM first extracts plural path candidates for each destination to satisfy the delay constraint. Then, it repeatedly selects better paths among candidates so as to find a lowcost tree within a short computation time. The performance of OPSAM is verified through simulations in the random graph model and the Tiers model, where OPSAM is better than the best existing algorithm BSMA, especially for Tiers model instances. The second problem requires finding a sequence of multicast trees which should be modified to follow changes of mobile user locations, such that the sum of the total edge costs and the difference between two consecutive trees is minimized. The simulation results show the performance of OPSAM is better than BSMA.

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  • 通信プロトコルの試験系列生成問題へのSATアルゴリズム適用法の提案

    大塚裕孝, 中田明夫, 舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告, COMP2001-75   2002

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  • 双方向マンハッタンストリートネットワークのノード配置問題に対する階層型近似アルゴリズムの提案

    米津正隆, 舩曵信生, 横平徳美, 中西透, 田島滋人, 中田明夫, 東野輝夫

    電子情報通信学会技術研究報告, COMP2001-77   2002

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  • A minimal-state processing search algorithm for satisfiability problems

    N Funabiki, T Yokohira, T Nakanishi, S Tajima, T Higashino

    2001 IEEE INTERNATIONAL CONFERENCE ON SYSTEMS, MAN, AND CYBERNETICS, VOLS 1-5   2769 - 2774   2002

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    The satisfiability problem (SAT) is a typical NP-complete problem where a wide range of applications has been studied. Given a set of variables U and a set of clauses C, the goal of SAT is to find a truth assignment to variables in U such that every clause in C is satisfied if it exits, or to derive the infeasibility otherwise. This paper presents an approximation algorithm called a minimal,state processing search algorithm for SAT (MIPS_SAT). MIPS_SAT repeatedly transits minimal states in terms of the cost function for searching a solution through a construction stage and a refinement stage. The first stage greedily generates an initial state composed of as many satisfied clauses as possible. The second stage iteratively seeks a solution while keeping state minimality. The performance of MIPS_SAT is verified through solving DIMACS benchmark instances.

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  • An improved lip contour extraction method using deformable template and its automatic threshold adjusting method

    YOKOGAWA Yujin, FUNABIKI Nobuo, HIGASHINO Teruo, MORI Yoshihide

    IEICE technical report.   101 ( 434 )   37 - 44   2001.11

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    The precise extraction of the lip contour has been strongly demanded to plan the surgery and evaluate the recovery for patients with harelips and cleft palates. In this paper, we explain a non-symmetrical deformable template for the lip contour extraction using the template matching method to improve the existing symmetrical deformable template, and the transformation method of the lip contour model into the coordinate system based on the medial canthus point. Then, we propose an algorithm for adjusting the thresholds to extract the hue and value images. Through evaluations using face image samples including patients, we show the accuracy of our proposed method.

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  • Relaxation of coefficient sensitiveness to performance for neural networks using neuron filter through total coloring problems

    Y Takenaka, N Funabiki, T Higashino

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E84A ( 9 )   2367 - 2370   2001.9

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    In this paper we show that the neuron filter is effective for relaxing the coefficient sensitiveness of the Hopfield neural network for combinatorial optimization problems. Since the parameters in motion equation have a significant influence on the performance of the neural network, many studies have been carried out to support determining the value of the parameters. However, not a few researchers have determined the value of the parameters experimentally yet. We show that the use of the neuron filter is effective for the parameter tuning, particularly for determining their values experimentally through simulations.

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  • A Proposal of a Lip Contour Approximation Method Using the Function Synthesis

    SEKIOKA Tetsuya, YOKOGAWA Yuzin, FUNABIKI Nobuo, HIGASHINO Teruo, YAMADA Tomohiro, MORI Yoshihide

    The Transactions of the Institute of Electronics,Information and Communication Engineers.   84 ( 3 )   459 - 470   2001.3

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    唇の輪郭線は, 口腔外科における口唇裂症などの術式検討や術後トレースに重要であり, シンプルかつ高精度のモデルでの自動抽出が望まれている.そこで本論文では, 顔画像を入力とし, 前処理, 1次検出, 2次検出の3段階の処理を経て, 唇の輪郭線を関数で合成する手法を提案する.まず前処理では, 顔画像から唇の位置を検出し, おおよその大きさを決定する.次に1次検出ではDeformable templateマッチング法により唇のおおよその輪郭線を探索する.そして2次検出では, 遺伝的プログラミングを用いて置換と分割によって詳細な唇の輪郭線を探索する.本提案手法が従来の動的輪郭モデル(SNAKES)よりも精度, パラメータ数, 探索時間の点で優れていることを一般人の唇, 口唇裂症患者の唇のサンプルに対するシミュレーションにより示す.

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  • An Optimal Path Selection Algorithm for Static Multicast Routing Problems

    FUJII MASAKAZU, FUNABIKI NOBUO, NAKATA AKIO, KITAMICHI JUNJI, HIGASHINO TERUO

    IEICE technical report. Theoretical foundations of Computing   100 ( 568 )   39 - 46   2001.1

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    In this paper, we present a heuristic algorithm called OPSAM(Optimal Path Selection Algorithm for Multicast)for the static multicast routing problem. Given a directed connected graph with two weights associated to each edge, representing the cost and the delay, a source sending out data, and a set of destinations receiving data, this problem requires to provide a multicast tree such that the total cost of edges in the tree is not only minimized, but also every path delay from the source to a destination is less than its upper limit. OPSAM first extracts plural candidates to each destination that satisfy the delay constraint. Then, it iteratively selects better paths among them so that it can find a low-cost tree within short time. The performance of OPSAM is verified through simulations in two types of network models, where especially, OPSAM shows the high performance for Tiers model instances, which are close to real networks.

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  • A proposal of a lip contour extraction method using deformable template and a transformation method into coordinate system based the medial canthus point

    YOKOGAWA Yuzin, FUNABIKI Nobuo, HIGASHINO Teruo, YAMADA Tomohiro, MORI Yoshihide

    Technical report of IEICE. PRMU   100 ( 566 )   31 - 38   2001.1

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    Recently, shapes and relative positions of face components such as the lip contour have been intensively studied in areas including medicine and psychology. Actually, the precise extraction of the lip contour and its position has been strongly demanded to plan the surgery and evaluate the recovery for patients with harelips and cleft palates. In this paper, we propose a non-symmetrical deformable template for the lip contour extraction using the template matching method to improve the existing symmetrical deformable template. Besides, we propose the transformation method of the lip contour model into the coorinate system based on the medial canthus point. Through evaluations using face image samples including patients, we show the accuracy of our proposed method.

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  • A global routing technique for wave-steered design methodology

    N. Funabiki, A. Singh, A. Mukherjee, M. Marek-Sadowska

    Proceedings - Euromicro Symposium on Digital Systems Design: Architectures, Methods and Tools, DSD 2001   430 - 436   2001

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    Wave-Steering is a new circuit design methodology to realize high throughput circuits by embedding layout friendly structures in silicon. Latches guarantee correct signal arrival times at the input of synthesized modules and maintain the high throughput of operation. This paper presents a global routing technique for networks of wave-steered blocks. Latches can be distributed along interconnects. Their number depends on net topologies and signal ordering at the inputs of wave steered blocks. here, we route nets using Steiner tree heuristics and determine signal ordering and latch positions on interconnect. The problem of total latch number minimization is solved using SAT formulation. Experimental results on benchmark circuits show the efficiency of our technique. We achieve on average a 40% latch reduction at minimum latency over un-optimized circuits operating at 250 MHz in 0.25 μm CMOS technology.

    DOI: 10.1109/DSD.2001.952358

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  • モバイル・マルチキャストルーティング問題に対する最適パス選択解法の提案

    常村和史, 田島滋人, 藤井雅和, 中田明夫, 横平徳美, 舩曵信生, 東野輝夫

    マルチメディア通信と分散処理ワークショップ講演集   2001

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  • ネットワークのリンクスケジューリングへのグラフ彩色アプローチ

    田島滋人, 舩曵信生, 東野輝夫, 横平徳美, 中西透

    電子情報通信学会技術研究報告, COMP2001-71   2001

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  • Relaxation of coefficient sensitiveness to performance for neural networks using neuron filter through total coloring

    Yoichi Takenaka, Nobuo Funabiki, Teruo Higashino

    IEICE Transactions on Fundamentals   2001

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  • A proposal of neuron filter: A constraint resolution scheme of neural networks for combinatorial optimization problems

    Y Takenaka, N Funabiki, T Higashino

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E83A ( 9 )   1815 - 1823   2000.9

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    A constraint resolution scheme in the Hopfield-type neural network named "Neuron Filter" is presented for efficiently solving combinatorial optimization problems. The neuron filter produces an output that satisfies the constraints of the problem as best as possible according to both neuron inputs and outputs. This paper defines the neuron filter and shows its introduction into existing neural networks for N-queens problems and FPGA board-level routing problems. The performance is evaluated through simulations wharf the results show that our neuron filter improves the searching: capability of the neural network with the shorter computation time.

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  • A proposal of neuron filter a constraint resolution scheme of neural networks for combinatorial optimization problems

    Yoichi Takenaka, *Nobuo Funabiki, Teruo Higashino

    IEICE Transactions on Fundamentals   E83-A ( 9 )   1815 - 1823   2000.9

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  • A Formulation of an FPGA Logic-Block Pin Assignment Problem and Its Two-Stage Discrete Optimization Method

    FUNABIKI Nobuo, IKENAGA Katsuyoshi, EGAWA Shinji, HIGASHINO Teruo

    The Transactions of the Institute of Electronics,Information and Communication Engineers. A   83 ( 8 )   976 - 988   2000.8

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  • A minimal-state procssing search algorithm for graph coloring problems

    FUNABIKI Nobuo, HIGASHINO Teruo

    IEICE Transactions on Fundamentals   E83-A ( 7 )   1420 - 1430   2000.7

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    This paper presents a heuristic graph coloring algorithm named MIPS_CLR, a MInimal-state Processing Search algorithm for the graph CoLoRing problem. Given a graph G(V, E), the goal of this NP-complete problem is to find a color assignment to every vertex in V such that any pair of adjacent vertices must not receive the same color but also the total number of colors should be minimized. The graph coloring problem has been widely studied due to its large number of practical applications in various fields. In MIPS_CLR, a construction stage first generates an intial minimal state composed of as many as colored vertices by a simple greedy algorithm, after a miximal clique of G is found by a maximum clique algorithm. Then, a refinement stage iteratively seeks a solution state while keeping minimality in terms of a cost function by a minimal-state transition method. In this method, the schemes of a best color selection, a random color selection, a color assignment shuffle, and a gradual color expansion are used together to realize the discrete descent search with hill-climbing capabilities. The performance of MIPS_CLR is evaluated through solving DIMACS benchmark graph instances, where the solution quality is generally better than existing algorithms while the computation time is comparable with the best existing one. In particular, MIPS_CLR provides new lower bound solutions for several instances. The simulation results confirm the extensive search capability of our MIPS_CLR approach for the graph coloring problem.

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  • A minimal-state processing search algorithm for graph coloring problems

    N Funabiki, T Higashino

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E83A ( 7 )   1420 - 1430   2000.7

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    This paper presents a heuristic graph coloring algorithm named MIPS_CLR, a MInimal-state Processing Search algorithm for the graph CoLoRing problem. Given a graph G(V, E), the goal of this NP-complete problem is to find a color assignment to every vertex in II such that arty pair of adjacent vertices must not receive the same color but also the total number of colors should be minimized. The graph coloring problem has been widely studied due to its large number of practical applications in various fields. In MIPS-CLR, a construction stage first generates an initial minimal state composed of as many as: colored vertices by a simple greedy algorithm, after a maximal clique of G is found by a maximum clique algorithm. Then, a refinement stage iteratively seeks a solution state while keeping minimality in terms of a cost function by a minimal-state transition method. In this method, the schemes of a best color selection, a random color selection, a color assignment shuffle, and a gradual color expansion are used together to realize the discrete descent starch with hill-climbing capabilities. The performance of MIPS_CLR is evaluated through solving DIMACS benchmark graph instances, where the solution quality is generally better than existing algorithms while the computation time is comparable with the Lest existing one. In particular, MIPS-CLR provides new lower bound solutions for several instances. The simulation results, confirm the extensive search capability of our MIPS_CLR approach For the graph coloring problem.

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  • A Proposal of a Two-Stage Approximation Algorithm for Link Scheduling Problems in Radio Networks

    TAJIMA Shigeto, FUNABIKI Nobuo, HIGASHINO Teruo

    IEICE technical report. Theoretical foundations of Computing   99 ( 724 )   65 - 72   2000.3

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    In a multihop radio network, packets are transmitted from source nodes to destination nodes by activating connected links between them. Each node can either send a packet to or receive a packet from at most one of its adjacent nodes simultaneously. In order to minimize the transmission time for given requests, the problems must be solved of selecting a transmission route for each request (the routing problem) and of finding a link schedule (the link scheduling problem). In this paper, we propose a two-stage approximation algorithm for the link scheduling problem. The link scheduling problem is composed of SAS to satisfy the sequence of link activations and NAS not to satisfy it. We verify the performance through simulations for NAS and SAS, where our algorithm finds better solutions in shorter time than the existing algorithms.

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  • A three-stage heuristic combined neural-network algorithm for channel assignment in cellular mobile systems

    N Funabiki, N Okutani, S Nishikawa

    IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY   49 ( 2 )   397 - 403   2000.3

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    A three-stage algorithm of combining sequential heuristic methods into a parallel neural network is presented for the channel assignment problem in cellular mobile communication systems in this paper. The goal of this NP-complete problem is to find a channel assignment to requested calls with the minimum number of channels subject to interference constraints between channels. The three-stage algorithm consists of: 1) the regular interval assignment stage; 2) the greedy assignment stage; and 3) the neural-network assignment stage. In the first stage, the calls in a cell determining the lower bound on the total number of channels are assigned channels at regular intervals. In the second stage, the calls in a cell with the largest degree and its adjacent cells are assigned channels by a greedy heuristic method. In the third stage, the calls in the remaining cells are assigned channels by a binary neural network, The performance is verified through solving well-known benchmark problems, Especially for Sivarajan's benchmark problems, our three-stage algorithm first achieves the lower bound solutions in all of the 13 instances, while the computation time is comparable with existing algorithms.

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  • A three-stage heuristic combined neural-network algorithm for channel assignment in cellular mobile systems

    Nobuo Funabiki, Noriko Okutani, Seishi Nishikawa

    IEEE Transactions on Vehicular Technology   49 ( 2 )   397 - 403   2000

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    A three-stage algorithm of combining sequential heuristic methods into a parallel neural network is presented for the channel assignment problem in cellular mobile communication systems in this paper. The goal of this NP-complete problem is to find a channel assignment to requested calls with the minimum number of channels subject to interference constraints between channels. The three-stage algorithm consists of: 1) the regular interval assignment stage
    2) the greedy assignment stage
    and 3) the neural-network assignment stage. In the first stage the calls in a cell determining the lower bound on the total number of channels are assigned channels at regular intervals. In the second stage the calls in a cell with the largest degree and its adjacent cells are assigned channels by a greedy heuristic method. In the third stage the calls in the remaining cells are assigned channels by a binary neural network. The performance is verified through solving well-known benchmark problems. Especially for Sivarajan's benchmark problems our three-stage algorithm first achieves the lower bound solutions in all of the 13 instances while the computation time is comparable with existing algorithms. © 2000 IEEE.

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  • A three-stage heuristic combined neural-network algorithm for channel assignment in cellular mobile systems

    Nobuo Funabiki, Noriko Okutani, Seishi Nishikawa

    IEEE Transactions on Vehicular Technology   49 ( 2 )   397 - 403   2000

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    A three-stage algorithm of combining sequential heuristic methods into a parallel neural network is presented for the channel assignment problem in cellular mobile communication systems in this paper. The goal of this NP-complete problem is to find a channel assignment to requested calls with the minimum number of channels subject to interference constraints between channels. The three-stage algorithm consists of: 1) the regular interval assignment stage
    2) the greedy assignment stage
    and 3) the neural-network assignment stage. In the first stage the calls in a cell determining the lower bound on the total number of channels are assigned channels at regular intervals. In the second stage the calls in a cell with the largest degree and its adjacent cells are assigned channels by a greedy heuristic method. In the third stage the calls in the remaining cells are assigned channels by a binary neural network. The performance is verified through solving well-known benchmark problems. Especially for Sivarajan's benchmark problems our three-stage algorithm first achieves the lower bound solutions in all of the 13 instances while the computation time is comparable with existing algorithms. © 2000 IEEE.

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  • A greedy digital neural-network algorithm for subgraph isomorphism problems

    Nobuo Funabiki, Teruo Higashino

    Proc. of World Multiconference on Systemics, Cybernetics, and Informatics   2000

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  • A greedyneural combined discrete optimization algorithm for triangle and Kn-subgraph partition problem

    OHTSUKA H.

    Proc. World Multiconference on Systemics, Cybernetics and Informatics (SCI2000)   12   557 - 562   2000

  • A proposal of a neuron filter algorithm with a thinning-out method for total coloring problems

    Yoichi Takenaka, Nobuo Funabiki

    Proc. of World Multiconference on Systemics, Cybernetics, and Informatics   2000

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  • 遺伝的プログラミングを用いた関数合成アルゴリズムの改良法の提案

    関岡哲也, 船曵信生, 東野輝夫

    電子情報通信学会論文誌D1   2000

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  • 静的マルチキャストルーティング問題に対する2段階解法の提案

    藤井雅和, 船曵信生, 東野輝夫

    第13回回路とシステム(軽井沢)ワークショップ講演集   2000

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  • 無線通信網における信頼度制約通信経路割当問題に対するニューラルネットワーク併用二段階解法の提案

    馬場孝之, 船曵信生, 田島滋人

    電子情報通信学会論文誌A   2000

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  • A gradual neural network approach for FPGA segmented channel routing problems

    N Funabiki, M Yoda, J Kitamichi, S Nishikawa

    IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS   29 ( 4 )   481 - 489   1999.8

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    A novel neural network approach called gradual neural network (GNN) is presented for segmented channel routing in field programmable gate arrays (FPGA's). FPGA's contain predefined segmented channels for net routing, where adjacent segments in a track can be interconnected through programmable switches for longer segments. The goal of the FPGA segmented channel routing problem, known to be NP-complete, is to find a conflict-free net routing with the minimum routing cost. The GNN for the N-net-M-track problem consists of a neural network of N x M binary neurons and a gradual expansion scheme. The neural network satisfies the constraints of the problem, while the gradual expansion scheme seeks the cost minimization by gradually increasing activated neurons. The energy function and the motion equation are newly defined with heuristic methods, The performance is verified through solving 30 instances, where GNN finds better solutions than existing algorithms within a constant number of iteration steps.

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  • A gradual neural network approach for FPGA segmented channel routing problems

    Nobuo Funabiki, Makiko Yoda, Junji Kitamichi, Seishi Nishikawa

    IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics   29 ( 4 )   481 - 489   1999.8

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    A novel neural network approach called gradual neural network (GNN) is presented for segmented channel routing in field programmable gate arrays (FPGA's). FPGA's contain predefined segmented channels for net routing, where adjacent segments in a track can be interconnected through programmable switches for longer segments. The goal of the FPGA segmented channel routing problem, known to be NP-complete, is to find a conflict-free net routing with the minimum routing cost. The GNN for the N-net-M-track problem consists of a neural network of N x M binary neurons and a gradual expansion scheme. The neural network satisfies the constraints of the problem, while the gradual expansion scheme seeks the cost minimization by gradually increasing activated neurons. The energy function and the motion equation are newly defined with heuristic methods. The performance is verified through solving 30 instances, where GNN finds better solutions than existing algorithms within a constant number of iteration steps. © 1999 IEEE.

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  • A gradual neural network approach for FPGA segmented channel routing problems

    Nobuo Funabiki, Makiko Yoda, Junji Kitamichi, Seishi Nishikawa

    IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics   29 ( 4 )   481 - 489   1999.8

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    A novel neural network approach called gradual neural network (GNN) is presented for segmented channel routing in field programmable gate arrays (FPGA's). FPGA's contain predefined segmented channels for net routing, where adjacent segments in a track can be interconnected through programmable switches for longer segments. The goal of the FPGA segmented channel routing problem, known to be NP-complete, is to find a conflict-free net routing with the minimum routing cost. The GNN for the N-net-M-track problem consists of a neural network of N x M binary neurons and a gradual expansion scheme. The neural network satisfies the constraints of the problem, while the gradual expansion scheme seeks the cost minimization by gradually increasing activated neurons. The energy function and the motion equation are newly defined with heuristic methods. The performance is verified through solving 30 instances, where GNN finds better solutions than existing algorithms within a constant number of iteration steps. © 1999 IEEE.

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  • A two-stage discrete optimization method for largest common subgraph problems

    N Funabiki, J Kitamichi

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS   E82D ( 8 )   1145 - 1153   1999.8

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    A novel combinatorial optimization algorithm called 2-stage discrete optimization method (2DOM) is proposed for the largest common subgraph problem (LCSP) in this paper. Given two graphs G = (V-1, E-1) and H = (V-2, E-2), the goal of LCSP is to find a subgraph G' = (V-1', E-1') of G and a subgraph H' = (V-2', E-2') of H such that G' and H' are not only isomorphic to each other but also their number of edges is maximized. The two graphs G' and H' are isomorphic when \V-1'\ = \V-2'\ and \E-1'\ = \E-2'\, and there exists one-to-one vertex correspondence f : V-1' --&gt; V-2' such that {u, v} is an element of E-1' if and only if {f(u), f(v)} is an element of E-2'. LCSP is known to be NP-complete in general. The 2DOM consists of a construction stage and a refinement stage to achieve the high solution quality and the short computation time for large size difficult combinatorial optimization problems. The construction stage creates a feasible initial solution with considerable quality, based on a greedy heuristic method. The refinement stage improves it keeping the feasibility, based on a random discrete descent method. The performance is evaluated by solving two types of randomly generated 1200 LCSP instances with a maximum of 500 vertices for G and 1000 vertices for H. The simulation result shows the superiority of 2DOM to the simulated annealing in terms of the solution quality and the computation time.

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  • A gradual neural network algorithm for broadcast scheduling problems in packet radio networks

    N Funaibiki, J Kitamichi

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E82A ( 5 )   815 - 824   1999.5

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    A novel combinatorial optimization algorithm called "Gradual neural network (GNN)" is presented for NP-complete broadcast scheduling problems in packet radio (PR) networks. A PR network provides data communications services to a set of geographically distributed nodes through a common radio channel. A time division multiple access (TDMA) protocol is adopted for conflict-free communications, where packets are transmitted in repetition of fixed-length time-slots called a TDMA cycle. Given a PR network, the goal of GNN is to find a TDMA cycle with the minimum delay time for each node to broadcast packets. GNN for the N-node-M-slot TDMA cycle problem consists of a neural network with N x M binary neurons and a gradual expansion scheme. The neural network not only satisfies the constraints but also maximizes transmissions by two energy functions, whereas the gradual expansion scheme minimizes the cycle length by gradually expanding the size of the neural network. The performance is evaluated through extensive simulations in benchmark instances and in geometric graph instances with up to 1000 vertices, where GNN always finds better TDMA cycles than existing algorithms. The result in this paper supports the credibility of our GNN algorithm for a class of combinatorial optimization problems.

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  • "A gradual neural network approach for broadcast scheduling in packet radio networks"

    *Nobuo Funabiki, Junji Kitamichi

    IEICE Transactions on Fundamentals   E-82-A ( 5 )   815 - 824   1999.5

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  • A Proposal of an Improved Function Synthesis Algorithm with Genetic Programming

    SEKIOKA TETSUYA, FUNABIKI NOBUO

    IEICE technical report. Nonlinear problems   98 ( 663 )   9 - 16   1999.3

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    The function synthesis problem for an unknown system requires to produce an approximate function which satisfies the relationships of given input and output data sets of the system. This problem is essential for the proper control of the system. When the system has the non-linearity characteristics, this problem becomes very difficult where the number of combinations of variables, constants, and operators quickly increases the computational complexity. This paper presents three improved methods for the genetic programming algorithm which is one of the function synthesis methods. They are the gradual expansion of function trees, the constant optimization by a local search, and the partial structure fixation of function trees based on the characteristics of the target system. The performance evaluation through the two-spirals problem and the sunspot prediction problem shows the effectiveness of the proposed three methods.

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  • A proposal of a neural network algorithm for route assignment problems with reliability in multihop radio networks

    BABA Takayuki, FUNABIKI Nobuo

    IEICE technical report. Nonlinear problems   98 ( 583 )   17 - 24   1999.2

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    A multihop radio network is a large communication network between many nodes distributed around wide areas. Through a radio channel, each node can either send a packet to, or receive a packet from, at most one of its adjacent nodes simultaneously. Packets are transmitted from source nodes to destination nodes by activating several links between these nodes. In order to maximize the throughput or minimize the transmission time for given transmission requests, it is required to assign a transmission route and a link activation schedule for each request. In this network, each node has is different reliability to perform its function properly depending on the difference of running period, design specification, and environment. In this paper, we propose a two-stage algorithm to assign routes whose reliabilities are more than the specified threshold. This algorithm is composed of the iterated candidate extraction method with reliability satisfaction to extract route candidates and the greedy neural network algorithm to select a route to minimize a cost among plural candidates. Through simulations up to-500-node networks, we verify that our algorithm finds good solutions effectively.

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  • Formal verification method for combinatorial circuits at high level design

    J Kitamichi, H Kageyama, N Funabiki

    PROCEEDINGS OF ASP-DAC '99   319 - 322   1999

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    In this paper, we propose a formal verification method for combinatorial circuits at high level design. The specification is described by both integer and Boolean variables for input and output variables, and the implementation is described by only Boolean variables. Our verification method judges the equivalence between the specification and the implementation by deciding the truth of Presburger sentence. We show experimental results on some benchmarks, such as 4bit ALU, multiplier, by our method.

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  • プレスブルガー文真偽判定アルゴリズムのためのBDDの応用とそれを用いた回路検証

    景山洋行, 北道淳司, 船曵信生

    情報処理学会論文誌   1999

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  • A proposal of a two-stage discrete optimization method for the maximum clique problem

    Nobuo Funabiki, Teruo Higashino

    Proc. of International Symposium on Nonlinear Theory and Its Applications   1999

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  • チャネル割当問題を対象とした拡張マキシマムニューラルネットワーク解法の提案

    池永勝芳, 船曵信生, 竹中要一

    電子情報通信学会論文誌A   1999

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  • 貪欲法とGAを併用したデータ転送路資源最適化問題解法の提案

    四方康人, 船曵信生, 北道淳司

    電子情報通信学会論文誌A   1999

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  • A non-feedback neuron filter algorithm for separated board-level routing problems in FPGA-based logic emulation systems

    Yoichi Takenaka, Nobuo Funabiki

    Proc. of IEEE International Joint Conference on Neural Networks   1999

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  • A gradual neural network approach for broadcast scheduling in packet radio networks

    Nobuo Funabiki, Yoichi Takenaka, Teruo Higashino

    Proc. of IEEE International Joint Conference on Neural Networks   1999

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  • A Neuron Filter Algorithm for Board-Level Routing Problems in FPGA-Based Logic Emulation Systems

    TAKENAKA Yoichi, FUNABIKI Nobuo

    IEICE technical report. Nonlinear problems   98 ( 443 )   23 - 29   1998.12

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    In this paper, we propose a non-feedback neuron filter algorithm in the neural network. for the board-level routing problem (BLRP) in an FPGA-based logic emulation system. For a rapid prototyping of large scale digital systems, multiple FPGA's provide an efficient logic emulation system, where signals or nets between design partitions embedded on different FPGA's are connected through crossbars. We propose a new neuron filter algorithm to satisfy the two constraints of the problem simultaneously. The simulation results in randomly generated benchmark size instances show that our neuron filter algorithm with the thinning out application provides the better routing capability with the shorter computation time.

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  • A proposal of a three-stage greedy neural-network algorithm for FPGA routing problems

    EGAWA Shinji, KURODA Eiji, KITAMICHI Junji, FUNABIKI Nobuo

    IEICE technical report. Computer systems   98 ( 291 )   69 - 75   1998.9

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    In this paper, we propose a three-stage routing algorithm for two-dimensional Field-Programmable Gate Arrays (FPGAs) by combining the greedy algorithm and the neural network algorithm. The three-stage algorithm consists of the route-candidate extraction stage, the greedy routing stage, and the neural network routing stage to achieve the high routability. The first stage extracts necessary route-candidates composed of a sequence of routing segments for every net. The second stage selects one of the candidates and assigns one track for each net so as to avoid short circuits. The final stage rearranges locations of shorter nets by the second stage to reduce the necessary tracks. We evaluate the performance of our algorithm by solving nine randomly generated instances, where the simulation results show that our three-stage algorithm achieves the high performance by used together.

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  • A proposal of a three - stage greedy neural - network algorithm for FPGA routing problems

    EGAWA SHINJI, KURODA EIJI, KITAMICHI JUNJI, FUNABIKI NOBUO

    IPSJ SIG Notes   1998 ( 87 )   121 - 127   1998.9

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    In this paper, we propose a three-stage routing algorithm for two-dimensional Field-Programmable Gate Arrays (FPGAs)by combining the greedy algorithm and the neural network algorithm. The three-stage algorithm consists of the route-candidate extraction stage, the greedy routing stage, and the neural network routing stage to achieve the high routability. The first stage extracts necessary route-candidates composed of a sequence of routing segments for every net. The second stage selects one of the candidates and assigns one track for each net so as to avoid short circuits. The final stage rearranges locations of shorter nets by the second stage to reduce the necessary tracks. We evaluate the performance of our algorithm by solving nine randomly generated instances, where the simulation results show that our three-stage algorithm achieves the high performance by used together.

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  • A Maxumum Neural Network Algorithm for a Channel Assignment Problem in Cellular Radio Networks

    IKENAGA Katsuyoshi, FUNABIKI Nobuo, TAKENAKA Yoichi, KITAMICHI Junji

    IEICE technical report. Nonlinear problems   97 ( 592 )   85 - 92   1998.3

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    In this paper, we propose a neural network algorithm using the maximum neuron model for the static channel assignment problem in cellular radio networks under the minimization of mutual interferences. The goal of this problem is to minimize the total interferences between calls subject to the constraint that all requested calls must be accepted. Our algorithm uses the expanded maximum neuron model to satisfy the constraint. In order to improve the solution quality, the regular interval assignment is adopted into a cell with the largest demands. In addition, the shaking term, the hill-climbing term, and the omega function are used together in the motion equation. We verify the performance through simulations using benchmark problems, where our algorithm finds better solutions than the existing algorithms.

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  • A Performance Evaluation of Digital Neural Network Algorithms for Stable Marriage Problems

    TAJIMA Shigeto, FUNABIKI Nobuo, KITAMITI Junji

    IEICE technical report. Nonlinear problems   97 ( 592 )   77 - 84   1998.3

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    In this paper, we evalute the performance of digital neural network algorithms using three neuron models (binary neuron model, hysteresis binary neuron model, and maximum neuron model) and three computation methods (synchronous parallel computation method, N-parallel computation method, and sequential computation method) for the stable marriage problem. The goal of the problem is to find N stable pairs of N men and N women under given preference lists. A pair becomes unstable when there is an unpaired couple of a man and a woman who prefers each other to their actual partners. The simulation results through randomly generated instances show that the performance of the maximum neuron model on the sequential computation method surpasses the other methods in terms of the convergence properly and the solution quality.

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  • An Application of Convex Hull to Genetic Algorithm for Traveling Salesman Problem

    TAKENAKA Yoichi, FUNABIKI Nobuo

    Technical report of IEICE. SS   97 ( 521 )   17 - 24   1998.1

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    In this paper, we propose an application of the "visiting order restriction theorem" to Pal's algorithm, a genetic algorithm for the traveling salesman problem (TSP). The visiting order restriction theorem gives a necessary condition for the shortest tour of TSP on the Euclidean plane by using the convex hull. The convex hull of a set of points S on a plane is defined as the smallest convex polygon that encloses S. The O (|S|log|S|)-time algorithm has been known to find the convex hull of a set of points S. The genetic algorithm, which simulates the process of the natural selection, is known as one of best approximate algorithms for TSP. In our method, the initial tours are produced to satisfy the necessary condeition for the shortest path in order to improve the solution quality. The simulation results using benchmark problems show our genetic algorithm finds shorter tours than P'al's algorithm at the large size benchmark problems.

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  • An evolutionary neural network approach for module orientation problems

    Nobuo Funabiki, Junji Kitamichi, Seishi Nishikawa

    IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics   28 ( 6 )   849 - 855   1998

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    A novel neural network approach called "Evolutionary Neural Network (ENN)" is presented for the module orientation problem. The goal of this NP-complete problem is to minimize the total wire length by flipping circuit modules with respect to their vertical and/or horizontal axes of symmetry. In order to achieve high quality VLSI systems, it is strongly desired to solve the problem as quickly as possible in the design cycle. Based on the concept of the genetic algorithm, the evolutionary initialization scheme on neuron states is introduced so as to provide a high quality solution within a very short time. The performance of ENN is compared with three heuristic algorithms through simulations on 20 examples with up to 500 modules. The results show that ENN can find the best solutions in the shortest time. © 1998 IEEE.

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  • An evolutionary neural network approach for module orientation problems

    Nobuo Funabiki, Junji Kitamichi, Seishi Nishikawa

    IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics   28 ( 6 )   849 - 855   1998

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    A novel neural network approach called "Evolutionary Neural Network (ENN)" is presented for the module orientation problem. The goal of this NP-complete problem is to minimize the total wire length by flipping circuit modules with respect to their vertical and/or horizontal axes of symmetry. In order to achieve high quality VLSI systems, it is strongly desired to solve the problem as quickly as possible in the design cycle. Based on the concept of the genetic algorithm, the evolutionary initialization scheme on neuron states is introduced so as to provide a high quality solution within a very short time. The performance of ENN is compared with three heuristic algorithms through simulations on 20 examples with up to 500 modules. The results show that ENN can find the best solutions in the shortest time. © 1998 IEEE.

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  • A gradual neural-network algorithm for jointly time-slot/code assignment problems in packet radio networks

    Nobuo Funabiki, Junji Kitamichi

    IEEE Transactions on Neural Networks   9 ( 6 )   1523 - 1528   1998

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    A gradual neural network (GNN) algorithm is presented for the jointly time-slot/code assignment problem (JTCAP) in a packet radio network in this paper. The goal of this newly defined problem is to find a simultaneous assignment of a time-slot and a code to each communication link, whereas time-slots and codes have been independently assigned in existing algorithms. A time/code division multiple access protocol is adopted for conflict-free communications, where packets are transmitted in repetition of fixed-length time-slots with specific codes. GNN seeks the time-slot/code assignment with the minimum number of time-slots subject to two constraints: 1) the number of codes must not exceed its upper limit and 2) any couple of links within conflict distance must not be assigned to the same time-slot/code pair. The restricted problem for only one code is known to be NP-complete. The performance of GNN is verified through solving 3000 instances with 100-500 nodes and 100-1000 links. The comparison with the lower bound and a greedy algorithm shows the superiority of GNN in terms of the solution quality with the comparable computation time. © 1998 IEEE.

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  • A gradual neural-network algorithm for jointly time-slot/code assignment problems in packet radio networks

    Nobuo Funabiki, Junji Kitamichi

    IEEE Transactions on Neural Networks   9 ( 6 )   1523 - 1528   1998

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    A gradual neural network (GNN) algorithm is presented for the jointly time-slot/code assignment problem (JTCAP) in a packet radio network in this paper. The goal of this newly defined problem is to find a simultaneous assignment of a time-slot and a code to each communication link, whereas time-slots and codes have been independently assigned in existing algorithms. A time/code division multiple access protocol is adopted for conflict-free communications, where packets are transmitted in repetition of fixed-length time-slots with specific codes. GNN seeks the time-slot/code assignment with the minimum number of time-slots subject to two constraints: 1) the number of codes must not exceed its upper limit and 2) any couple of links within conflict distance must not be assigned to the same time-slot/code pair. The restricted problem for only one code is known to be NP-complete. The performance of GNN is verified through solving 3000 instances with 100-500 nodes and 100-1000 links. The comparison with the lower bound and a greedy algorithm shows the superiority of GNN in terms of the solution quality with the comparable computation time. © 1998 IEEE.

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  • A Formal Method of Proving Invariants for Synchronous Sequential Circuits with Plural Controllers

    SAITOH YOSHIKATSU, TAKENAKA TAKASHI, KITAMICHI JUNJI, FUNABIKI NOBUO

    IPSJ SIG Notes   97 ( 119 )   41 - 48   1997.12

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    In this paper, we propose a formal method of proving invariants for synchronous sequential circuits with plural controllers in high level design. The invariant is the relationship among registers and signals that the user asserts. The circuit design consists of several finite state machines (controllers) and datapath. The invariants can be set at arbitrary finite states by user. The execution conditions, operations in datapath, and invariants are described with variables and functions over Boolean, integer, and abstract data type defined by user. The invariants are proved on the assumption that several invariants, datapath, execution conditions, and lemmas for user-defined functions are correct. This proof uses the structural induction on finite states. On proving invariants, the system a product controller which is equivalent to each controllers and proves by structural induction with the product controller. We eliminate unreachable states on generating the product controller. The sufficient conditions of expressions to prove are proved with a decision algorithm for the truth of Presburger sentence. We evaluate the proposed method for verifying the correctness of the PCI bus interface circuit design.

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  • A Neural Network for One-Shot Scheduling Problems in Multicast Packet Switching Systems

    BABA Takayuki, FUNABIKI Nobuo, NISHIKAWA Seishi

    The Transactions of the Institute of Electronics,Information and Communication Engineers. A   80 ( 11 )   1973 - 1981   1997.11

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  • A Proposal of a Neuro-GA Hybrid Algorithm for Data Transfer Binding Problems

    SHIKATA Yasuhito, FUNABIKI Nobuo, KITAMICHI Junji, NISHIKAWA Seishi

    Technical report of IEICE. SS   97 ( 261 )   23 - 30   1997.9

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    High-level synthesis from behavioral descriptions for VLSI systems is devided into three sub-problems. In this paper, we propose an approximation algorithm using a neural network and a genetic algorithm for the data transfer binding problem which is one of the sub-problems. Our algorithm adopts the bus-oriented interconnection style. The simulation results through benchmark instances show that the proposed algorithm is superior to existing algorithms in terms of the solution quality, although it is inferior in computational time.

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  • A neural network approach for multilayer over-the-cell channel routing problems

    Nobuo Funabiki, Seishi Nishikawa

    Neurocomputing   16 ( 4 )   319 - 332   1997.9

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    A new algorithm for multilayer over-the-cell channel routing problems using two neural networks is presented in this paper. In the multilayer over- the-cell channel routing problem, signal nets may be placed not only in the multilayer channel between two cells, but also on the multilayer routing area over the cells. The goal of our algorithm is to route all the given nets in both routing areas with the minimum number of tracks in the channel. Our algorithm consists of four steps: (1) extracting nets for the over-the-cell routing, (2) routing nets in the multilayer over-the-cell muting area by the neural network, (3) transforming nets for the channel routing and (4) routing nets in the multilayer channel by the neural network. The performance of our algorithm was verified through seven benchmark problems with 1-4 layers for the over-the-cell and 2-8 layers for the channel. The simulation results support the flexibility of our algorithm in the multilayer over-the-cell channel routing problem.

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  • A neural network approach for multilayer over-the-cell channel routing problems

    Nobuo Funabiki, Seishi Nishikawa

    Neurocomputing   16 ( 4 )   319 - 332   1997.9

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    A new algorithm for multilayer over-the-cell channel routing problems using two neural networks is presented in this paper. In the multilayer over- the-cell channel routing problem, signal nets may be placed not only in the multilayer channel between two cells, but also on the multilayer routing area over the cells. The goal of our algorithm is to route all the given nets in both routing areas with the minimum number of tracks in the channel. Our algorithm consists of four steps: (1) extracting nets for the over-the-cell routing, (2) routing nets in the multilayer over-the-cell muting area by the neural network, (3) transforming nets for the channel routing and (4) routing nets in the multilayer channel by the neural network. The performance of our algorithm was verified through seven benchmark problems with 1-4 layers for the over-the-cell and 2-8 layers for the channel. The simulation results support the flexibility of our algorithm in the multilayer over-the-cell channel routing problem.

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  • The Stability of Discrete Neural Network for Combinational Optimization

    UMETANI Shunji, FUNABIKI Nobuo, NISHIKAWA Seishi

    IEICE technical report. Neurocomputing   97 ( 201 )   1 - 8   1997.7

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    In this paper, we study the convergence property of the Hopfield neural network using the binary neuron model named Discrete Neural Network (DNN). First, we present that DNN converges to a local minimum when the following two conditions are satisfied; (1)DNN has no self-interaction, and (2)the state of each neuron is updated asynchronously. Then, we discuss the behaviour of DNN if either condition is not satisfied so that we explain the cause of oscillatory behaviour.

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  • A proposal of a greedy neural network algorithm for route assignment problems in multihop radio networks

    BABA Takayuki, FUNABIKI Nobuo, NISHIKAWA Seishi

    IEICE technical report. Theoretical foundations of Computing   97 ( 157 )   41 - 48   1997.7

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    In a multihop radio network, packets are transmitted from source nodes to destination nodes by activating several links between nodes. Each node can either send a packet to, or receive a packet from, at most one of its adjacent nodes simultaneously. In order to minimize the transmission time for given requests, the route assignment problem must be solved to assign a transmission route for each request, and the link activation problem must be solved to find a link activation schedule. The route assignment problem is decomposed into two sub-problems: the candidate extraction problem and the route selection problem. In this paper, we introduce a new cost function for the route assignment problem, propose the plural candidates extraction method for the candidate extraction problem, and propose the greedy neural network algorithm for the route selection problem. Through simulations up to 500-node networks, we verify that our algorithm finds better solutions in shorter time and with smaller space than the existing algorithms.

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  • A proposal of "Neuron Filter" for Hopfield-type Neural Networks through Traveling Salesman Problems

    TAKENAKA Yoichi, FUNABIKI Nobuo, NISHIKAWA Seishi

    IEICE technical report. Neurocomputing   96 ( 583 )   287 - 294   1997.3

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    In this paper, we propose "Neuron Filter" as restricting the neural region to satify some constraints in order to improve the performance of Hopfield-type neural networks. Neuron Filter processes neuron states to satisfy constraints of combinatorial optimization problems. Neuron Filter is classified into "Maximum Neuron" and "Neuron Mask". Maximum Neuron feedbacks the outputs for the state update computations of neural networks, while Neuron Mask does not feedback them. This paper presents the definition of Neuron Filter and the introduction into the neural network through the travelling salesman problem. We verify the performance by solving benchmark problems, where the simulation results show Neuron Filter improves the performance of the neural network.

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  • A Maximum Neural Network Algorithm for Stable Marriage Problems

    TAJIMA Shigeto, FUNABIKI Nobuo, NISHIKAWA Seishi

    IEICE technical report. Neurocomputing   96 ( 583 )   295 - 302   1997.3

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    In this paper, we propose a maximum neural network algorithm for the stable marriage problem using the maximum neuron model. The goal of the stable marriage problem is to find N stable pairs of N men and N women under given preference lists. A pair becomes unstable when there is an unpaired couple of a man and a woman who prefer each other to their actual partners. The simulation results through randomly generated instances show that the performance of our maximum neural network surpasses the existing neural network using the binary neuron model in terms of the convergence properly and the solution quality.

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  • A Proposal of the N-Parallel Computation Method of the Neural Network for N-Queens Problems

    YOSHIO Hiroaki, BABA Takayuki, FUNABIKI Nobuo, NISHIKAWA Seishi

    The Transactions of the Institute of Electronics,Information and Communication Engineers. A   80 ( 1 )   205 - 212   1997.1

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  • A study on a two-phase neural network algorithm for channel assignment in cellular radio networks

    OKUTANI Noriko, FUNABIKI Nobuo, NISHIKAWA Seishi

    Technical report of IEICE. SS   96 ( 490 )   33 - 40   1997.1

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    This paper presents a two-phase neural network algorithm for the channel assignment problem in a cellular radio network. For a set of call requests, the goal of this NP-complete problem is to find a channel assignment, which does not only satisfy interference constraints between channels, but also minimizes the total number of frequency bands or channels. The proposed algorithm consists of two phases: 1) calls in most crowded cells are assigned channels by a heuristic method, and 2) calls in the other cells are assigned channels by a neural network. The performance is verified through eight benchmark problems, where our algorithm always finds the optimum or near-optimum solutions. The comparison of simulation results shows that the solution quality is better than the existing algorithms.

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  • A gradual neural-network approach for frequency assignment in satellite communication systems

    Nobuo Funabiki, Seishi Nishikawa

    IEEE Transactions on Neural Networks   8 ( 6 )   1359 - 1370   1997

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    A novel neural-network approach called gradual neural network (GNN) is presented for a class of combinatorial optimization problems of requiring the constraint satisfaction and the goal function optimization simultaneously. The frequency assignment problem in the satellite communication system is efficiently solved by GNN as the typical problem of this class in this paper. The goal of this NP-complete problem is to minimize the cochannel interference between satellite communication systems by rearranging the frequency assignment so that they can accommodate the increasing demands. The GNN consists of N × M binary neurons for the N-carrier-M-segment system with the gradual expansion scheme of activated neurons. The binary neural network achieves the constrain satisfaction with the help of heuristic methods, whereas the gradual expansion scheme seeks the cost optimization. The capability of GNN is demonstrated through solving 15 instances in practical size systems, where GNN can find far better solutions than the existing algorithm. © 1997 IEEE.

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  • A gradual neural-network approach for frequency assignment in satellite communication systems

    Nobuo Funabiki, Seishi Nishikawa

    IEEE Transactions on Neural Networks   8 ( 6 )   1359 - 1370   1997

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    A novel neural-network approach called gradual neural network (GNN) is presented for a class of combinatorial optimization problems of requiring the constraint satisfaction and the goal function optimization simultaneously. The frequency assignment problem in the satellite communication system is efficiently solved by GNN as the typical problem of this class in this paper. The goal of this NP-complete problem is to minimize the cochannel interference between satellite communication systems by rearranging the frequency assignment so that they can accommodate the increasing demands. The GNN consists of N × M binary neurons for the N-carrier-M-segment system with the gradual expansion scheme of activated neurons. The binary neural network achieves the constrain satisfaction with the help of heuristic methods, whereas the gradual expansion scheme seeks the cost optimization. The capability of GNN is demonstrated through solving 15 instances in practical size systems, where GNN can find far better solutions than the existing algorithm. © 1997 IEEE.

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  • A Binary Neural Network Algorithm for the Graph Partitioning Problem

    TAMAKI Yasuhiro, FUNABIKI Nobuo, NISHIKAWA Seishi

    IEICE technical report. Neurocomputing   96 ( 430 )   49 - 56   1996.12

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    In this paper, we present a neural network algorithm using binary neurons for a graph two-partitioning problem. For a given graph G(V, E), the goal of this NP-hard problem is to find a partition of vertices in V into two groups such that not only the sum of vertex-weights in each group is within the upper bound, but also the sum of edge-weights between groups is minimized. We formulate a new energy function and introduce a shaking term in the motion equation in order to improve the solution quality. We compare the performance of the neural network with two existing typical algorithms through simulations in unweighted and weighted random graphs. The results show that the neural network is comparable with existing algorithms for vertex-unweighted graphs in terms of the solution quality, and that it is much better for vertex-weighted graphs.

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  • An Evaluation of Four Existing Algorithms and a New Neural Network Algorithm for Traveling Salesman Problems

    SHIKATA Yasuhito, FUNABIKI Nobuo, NISHIKAWA Seishi

    IEICE technical report. Neurocomputing   96 ( 430 )   33 - 40   1996.12

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    The traveling salesman problem is a well-known NP-hard combinatorial optimization problem. To solve the problem many researchers have developed algorithms. In this paper, first, we compare the features of 4 main algorithms. Second, we propose a new neural network algorithm whose energy function takes 0 when the neuron outputs represent a tour. At last, we compare their performance with 5 bench mark problems .The results show that It is found that a proposal algorithm is superior to trivial neural network but inferior to these algorisms.

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  • A Neural Network Algorithm for the Minimum Maximal Matching Problem

    UMETANI Shunji, FUNABIKI Nobuo, NISHIKAWA Seishi

    IEICE technical report. Neurocomputing   96 ( 393 )   17 - 24   1996.11

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    For a given graph G(V,E), a subset M of E is called a matching of G if no pair of edges in M is adjacent to each other. In this paper, we present a neural network parallel algorithm for the minimum maximal matching problem. This NP-complete problem requires to find a maximal matching composed of the least number of edges in G. The neural network consists of N × N binary neurons for the N-vertex graph problem. In order to improve the solution quality, we present a heuristic term into the motion equation for diagonal neurons which represent the exclusion of vertices from the matching. We verify the performance through simulations using random graph, where our neural network finds better solutions than the greedy algorithm and the simulated annealing.

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  • "Winner-take-all" methods of Maximum neuron model

    TAKENAKA Yoichi, FUNABIKI Nobuo, NISHIKAWA Seishi

    Technical report of IEICE. SS   96 ( 347 )   25 - 32   1996.11

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    The maximum neuron model provides efficient neural network solutions for combinatorial optimization problems. In this "winner-take-all" model, one and only one neuron with the maximum input value is always fired in each group of neurons to satisfy the selection constrain. The maximum neuron model can not only reduce the searching space, but also save the computation load. In this paper, we propose two methods of selecting one neuron from two or more neurons which have same maximum input value, named "Least index method" and "Previous selection method". The simulation results show that the performance of the previous selection method performs better than the least index method generally.

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  • A maximum neural network algorithm for route selection problems in multihop radio networks

    BABA Takayuki, HIROAKI Yoshio, FUNABIKI Nobuo, NISHIKAWA Seishi

    IEICE technical report. Neurocomputing   96 ( 331 )   9 - 16   1996.10

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    In a multihop radio network, packets are transmitted from source nodes to destination nodes by activating several links between nodes. Each node can either send a packet to or receive a packet from at most one of its adjacent nodes simultaneously. In order to minimize the transmission time for given requests, the problems must be solved of selecting a transmission route for each request (the routing problem) and of finding a link activation schedule (the link activation problem). The routing problem is decomposed into two sub-problems; the candidate extraction problem and the route selection problem. In this paper, we propose a neural network algorithm using the maximum neuron model for the route selection problem. We verify the performance through simulations, where our algorithm finds better solutions in shorter time than the existing algorithms. We also prove the NP-hardness of this problem.

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  • A Neural Network Algorithm for the Graph Partitioning Problem

    TAMAKI Yasuhiro, FUNABIKI Nobuo, NISHIKAWA Seishi

    IEICE technical report. Neurocomputing   96 ( 178 )   99 - 106   1996.7

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    The graph partitioning problem requires to partition the vertices of a given graph into several groups within the specified size so as to minimize the sum of the edge weights between groups. In this paper, we propose a neural network algorithm for the graph two-partitioning problem using the binary neuron model. We introduce the shaking term inthe motion equation in order to improve the solution quality. For the performance evaluation, we applied the proposed algorithm for random graphs to compare the running time and the solution quality with existing algorithms. As for solution quality, our algorithm is nearly equal to the KL algorithm, whereas as for the running time, our algorithm is much faster than the KL algorithm.

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  • Maximum Neural Network Algorithms for N-Queen Problems

    TAKENAKA Yoichi, FUNABIKI Nobuo, NISHIKAWA Seishi

    IEICE technical report. Theoretical foundations of Computing   95 ( 498 )   77 - 84   1996.1

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    This paper presents maximum neural network algorithms for N-queen problems using the maximum neuron model. The maximum neuron model is proposed by Takefuji et al. in order to provide efficient neural network solutions for combinatorial optimization problems. In this model, one and only one neuron is always fired in each group of neurons, which can not only reduce the searching space drastically but also save the computation load. The simulation results show that the performance of our maximum neural network surpasses the existing neural network for the same problem. Particularly, the maximum neural network is shown to be much suitable for the semi-synchronous computation.

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  • A Neural Network Parallel Algorithm for One-shot Scheduling Problems in Multicast Packet Switching Systems with the Windowed Service

    BABA Takayuki, FUNABIKI Nobuo, NISHIKAWA Seishi

    IEICE technical report. Theoretical foundations of Computing   95 ( 498 )   93 - 102   1996.1

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    The multicast packet switching system with the windowed service can replicate a packet in each window and sent out the copies from different output ports simultaneously. In order to maximize the throughput, the problem must be solved in real time to find a switching configuration not only satisfying the constraints on the system, but also maximizing the number of copied packets under transmission demands. In this paper, we focus on the one-shot scheduling problem in the system where all copies of each packet must be sent simultaneously. First, we prove the NP-hardness of the problem. Then, we propose the neural network composed of W x N binary neurons for the N-input-port-W-window system. We verify the performance through simulations in up to 100-ports-3-window systems, where our neural network always finds near-optimum solutions within the constant number of iteration steps.

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  • A Proposal of a Neural Network Parallel Algorithm for Stable Marriage Problems

    TAJIMA Shigeto, FUNABIKI Nobuo, NISHIKAWA Seishi

    IEICE technical report. Theoretical foundations of Computing   95 ( 498 )   85 - 92   1996.1

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    The stable marriage problem requires to find N stable pairs of N men and N women under given preference lists. A pair is unstable when a man and a woman who are not partners prefer each other to their actual partners. In this paper, we propose a neural network parallel algorithm for the stable marriage problem. We verify the performance through simulations on the synchronous parallel computation.

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  • A neural network model for multilayer topological via minimization in a switchbox

    Nobuo Funabiki, Seishi Nishikawa

    IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems   15 ( 8 )   1012 - 1020   1996

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    This paper presents a new approach using a neural network model for the multilayer topological via minimization problem in a switchbox. Our algorithm consists of three steps: 1) dividing multiterminal nets into two-terminal nets, 2) finding a layer-assignment of the twoterminal nets by a neural network model so as to minimize the number of unassigned nets, and 3) embedding one via for each imassigned net by Marek-Sadowska's algorithm. The neural network model is composed of N x M processing elements to assign N two-terminal nets in an M -layer switchbox. The performante of our algorithm is verified by 15 benchmark problems where it can find optimum or near-optimum solutions. In the two-layer Burstein's switchbox, our algorithm finds a 15-via solution while the best known solution requires 20 vias. © 1996 IEEE.

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  • A neural network model for multilayer topological via minimization in a switchbox

    Nobuo Funabiki, Seishi Nishikawa

    IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems   15 ( 8 )   1012 - 1020   1996

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    This paper presents a new approach using a neural network model for the multilayer topological via minimization problem in a switchbox. Our algorithm consists of three steps: 1) dividing multiterminal nets into two-terminal nets, 2) finding a layer-assignment of the twoterminal nets by a neural network model so as to minimize the number of unassigned nets, and 3) embedding one via for each imassigned net by Marek-Sadowska's algorithm. The neural network model is composed of N x M processing elements to assign N two-terminal nets in an M -layer switchbox. The performante of our algorithm is verified by 15 benchmark problems where it can find optimum or near-optimum solutions. In the two-layer Burstein's switchbox, our algorithm finds a 15-via solution while the best known solution requires 20 vias. © 1996 IEEE.

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  • Comparisons of energy-descent optimization algorithms for maximum clique problems

    FUNABIKI N.

    IEICE Trans. Fundamentals   79 ( 4 )   452 - 460   1996

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    A clique of a graph G (V,E) is a subset of V such that every pair of vertices is connected by an edge in E. Finding a maximum clique of an arbitrary graph is a well-known NP-complete problem. Recently, several polynomial time "energy-descent optimization" algorithms have been proposed for approximating the maximum clique problem, where they seek a solution by minimizing the energy function representing the constraints and the goal function. In this paper, we propose the binary neural network as an efficient synchronous energy-descent optimization algorithm. Through two types of random graphs, we compare the performance of four promising energy-descent optimization algorithms. The simulation results show that "RaCLIQUE," the modified Boltzmann machine algorithm, is the best asynchronous algorithm for random graphs, while the binary neural network is the best one for k random cliques graphs.

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  • Neural networks for the unicast problem and the multicast problem in the multicast packet switching system

    BABA Takayuki, FUNABIKI Nobuo, NISHIKAWA Seishi

    IEICE technical report. Neurocomputing   95 ( 405 )   83 - 89   1995.12

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    With the packet replication, the multicast packet switching system with N input ports and N output ports can send n(≦N) copies of each packet to different output ports simultaneously. In order to maximize the throughput, the problem must be solved in real time to find a switching configuration not only satisfying the constraints on the system but also sending the maximum number of copied packets under transmission demands. In this paper, first, we focus on the unicast problem (n=1) in the multicast packet switching system and we solve by using the improved neural network. Then, we extend this idea to the multicast problem (n≧2) and we newly propose a neural network. We verified the performance through simulations, where our neural network can always find optimum solutions within constant number of iteration steps.

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  • A study on the parallel computation of the neural network for N-Queen problems

    YOSHIO Hiroaki, FUNABIKI Nobuo, NISHIKAWA Seishi

    IEICE technical report. Neurocomputing   95 ( 405 )   75 - 82   1995.12

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    The N-Queen problem has been studied by many researchers as the typical combinatorial optimization problem. In this paper, we first compared the performance of two existing neural networks both on the sequential computation and on the synchronous parallel computation. Then, we improved the parallel computation so as to avoid the degradation of the convergence rate. Finally, we proposed the asynchronous parallel computation which is suitable for a parallel machine with a maximum of N processors. We verified through simulations that the proposed method provides 100% convergence rate in up to 500-Queen problems.

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  • "An improved neural network for channel assignment problems in cellular mobile communication systems,"

    FUNABIKI Nobuo, NISHIKAWA Seishi

    IEICE Transactions on Communications   E78-B ( 8 )   1187 - 1196   1995.8

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    This paper presents an improved neural network for channel assignment problems in cellular mobile communication systems in the new co-channel interference model. Sengoku et al. first proposed the neural network for the same problem, which can find solutions only in small size cellular systems with up to 40 cells in our simulations. For the practical use in the next generation's cellular systems, the performance of our improved neural network is verified by large size cellular systems with up to 500 cells. The newly defined energy function and the motion equation with two heuristics in our neural network achieve the goal of finding optimum or near-optimum solutions in a nearly constant time.

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  • Neural Networks for Access Control in Multicast Packet Switching System

    BABA Takayuki, FUNABIKI Nobuo, NISHIKAWA Seishi

    Proceedings of the IEICE General Conference   75 - 75   1995

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  • Neural Networks for The N-Queen problems

    YOSHIO Hiroaki, FUNABIKI Nobuo, NISHIKAWA Seishi

    Proceedings of the IEICE General Conference   17   17 - 17   1995

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  • A parallel algorithm for traffic control problems in three-stage connecting networks

    Nobuo Funabiki, Yoshiyasu Takefuji

    Journal of Parallel and Distributed Computing   20 ( 2 )   236 - 240   1994

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    A parallel heuristic algorithm for traffic control problems in three-stage connecting networks is presented in this paper. A three-stage connecting network consists of an input crossbar switching stage, an intermediate crossbar switching stage, and an output crossbar switching stage. The goal of our algorithm is to quickly and efficiently find a conflict-free switching assignment for communication demands through the network. The algorithm requires n2 × m processing elements for the network composed of n input/output switches and m intermediate switches, where it runs not only on a sequential machine, but also on a parallel machine with maximally n2 × m processors. The algorithm was verified by 1100 simulation runs with the network size from 102 × 7 to 502 × 27. The simulation results show that the algorithm can find a solution in nearly constant time with n2 × m processors. © 1994 Academic Press, Inc.

    DOI: 10.1006/jpdc.1994.1022

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  • A Parallel Algorithm for Time-Slot Assignment Problems in TDM Hierarchical Switching Systems

    Nobuo Funabiki, Yoshiyasu Takefuji

    IEEE Transactions on Communications   42 ( 10 )   2890 - 2898   1994

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    This paper presents a parallel algorithm for timeslot assignment problems in TDM hierarchical switching systems, based on the neural network model. The TDM systems are operated. in repetitive frames composed of several Time-Slots. A Time-Slot represents a switching configuration where one packet is transmitted through an I/O line. The goal of our algorithm is to find conflict-free Time-Slot assignments for given switching demands. The algorithm runs on a maximum of n2×m processors for m-Time-Slot problems in n×n TDM systems. In small problems up to a 24×24 TDM system, the algorithm can find the optimum solution in a nearly constant time, when it is performed on n2×m processors. © 1994 IEEE

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  • A parallel multi-layer channel router on the HVH model

    Nobuo Funabaki, Yoshiyasu Takefuji

    Parallel Computing   19 ( 1 )   63 - 77   1993

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    With the advancement of the silicon technology multi-layered VLSI circuits and PCBs (printed circuit boards) have been widely used. Based on the neural network model this paper presents the first parallel algorithm for multi-layer channel routing problems on the HVH model which minimize wiring areas in VLSI circuits and PCBs. The algorithm requires n × m × 2s processing elements for the n-net-m-track-3s-layer problem. The algorithm not only runs on a sequential machine but also on a parallel machine with maximally n × m × 2s processors. The algorithm is verified by solving seven benchmark problems where it finds better solutions than the existing algorithms for 6-12-layer problems in nearly constant time on a parallel machine. © 1993.

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  • Comparisons of Seven Neural Network Models on Traffic Control Problems in Multistage Interconnection Networks

    Nobuo Funabiki, Yoshiyasu Takefuji, Kuo Chun Lee

    IEEE Transactions on Computers   42 ( 4 )   497 - 501   1993

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    This paper presents performance comparisons of seven neural network models on traffic control problems in multistage interconnection networks. The decay term, three neuron models, and two heuristics were evaluated. The goal of the traffic control problems is to find conflict-free switching configurations with the maximum throughput. Our simulation results show that the hysteresis McCulloch-Pitts neuron model without the decay term and with two heuristics has the best performance. © 1993 IEEE

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  • Comparisons of Seven Neural Network Models on Traffic Control Problems in Multistage Interconnection Networks

    Nobuo Funabiki, Yoshiyasu Takefuji, Kuo Chun Lee

    IEEE Transactions on Computers   42 ( 4 )   497 - 501   1993

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    This paper presents performance comparisons of seven neural network models on traffic control problems in multistage interconnection networks. The decay term, three neuron models, and two heuristics were evaluated. The goal of the traffic control problems is to find conflict-free switching configurations with the maximum throughput. Our simulation results show that the hysteresis McCulloch-Pitts neuron model without the decay term and with two heuristics has the best performance. © 1993 IEEE

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  • A Neural Network Approach to Topological Via-Minimization Problems

    Nobuo Funabiki, Yoshiyasu Takefuji

    IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems   12 ( 6 )   770 - 779   1993

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    Toooloeical via-minimization (TVM) algorithms in two-layer channels based on the artificial neural network model are presented in this paper. TVM problems require not only assigning wires or nets between terminals without an intersection to one of two layers, but also a minimization of the number of vias, which are the single contacts of nets between two layers. The goal of our algorithms is to embed the maximum number of nets without an intersection. Two types of TVM problems are examined: split rectangular TVM (RTVM) problems and split circular TVM (CTVM) problems. Our algorithms require 3n processing elements for the n-net split RTVM problems, and 5n processing elements for the n-net split CTVM problems. The algorithms were verified by solving seven problems with 20 to 80 nets. The algorithms can be easily extended for more-than-two-layer problems. © 1993 IEEE

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  • A Parallel Algorithm for Broadcast Scheduling Problems in Packet Radio Networks

    Nobuo Funabiki, Yoshiyasu Takefuji

    IEEE Transactions on Communications   41 ( 6 )   828 - 831   1993

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    A parallel algorithm based on an artificial neural network model for broadcast scheduling problems in packet radio networks is presented. The algorithm requires n x m processing elements for an n-node-MSlot radio network problem. The algorithm is verified by simulating 13 different networks. © 1993 IEEE.

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  • A Parallel Improvement Algorithm for the Bipartite Subgraph Problem

    Kuo Chun Lee, Nobuo Funabiki, Yoshiyasu Takefuji

    IEEE Transactions on Neural Networks   3 ( 1 )   139 - 145   1992

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    Since McCulloch and Pitts proposed an artificial neuron model in 1943, several neuron models have been investigated. This paper proposes the first parallel improvement algorithm using the maximum neural network model for the bipartite subgraph problem. The goal of this NP-complete problem is to remove the minimum number of edges in a given graph such that the remaining graph is a bipartite graph. A large number of instances have been simulated to verify the proposed algorithm, with the simulation result showing that our algorithm finds a solution within 200 iteration steps and the solution quality is superior to that of the best existing algorithm. The algorithm is extended for the k-partite subgraph problem, where no algorithm has been proposed. © 1992 IEEE

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  • A Parallel Improvement Algorithm for the Bipartite Subgraph Problem

    Kuo Chun Lee, Nobuo Funabiki, Yoshiyasu Takefuji

    IEEE Transactions on Neural Networks   3 ( 1 )   139 - 145   1992

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    Since McCulloch and Pitts proposed an artificial neuron model in 1943, several neuron models have been investigated. This paper proposes the first parallel improvement algorithm using the maximum neural network model for the bipartite subgraph problem. The goal of this NP-complete problem is to remove the minimum number of edges in a given graph such that the remaining graph is a bipartite graph. A large number of instances have been simulated to verify the proposed algorithm, with the simulation result showing that our algorithm finds a solution within 200 iteration steps and the solution quality is superior to that of the best existing algorithm. The algorithm is extended for the k-partite subgraph problem, where no algorithm has been proposed. © 1992 IEEE

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  • A neural network model for finding a near-maximum clique

    Nubuo Funabiki, Yoshiyasu Takefuji, Kuo-Chun Lee

    Journal of Parallel and Distributed Computing   14 ( 3 )   340 - 344   1992

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    A parallel algorithm based on the neural network model for finding a near-maximum clique is presented in this paper. A maximum clique of a graph G is a maximum complete subgraph of G where any two vertices are adjacent. The problem of finding a maximum clique is NP-complete. The parallel algorithm requires n processing elements for an n-vertex graph problem. The algorithm is verified by solving 230 different graph problems. The simulation results show that our computation time on a Macintosh IIfx is shorter than that of two better known algorithms on a Cray 2 and an IBM 3090 while the solution quality is similar. The algorithm solves a near-maximum clique problem in nearly constant time on a parallel machine with n processors. © 1992.

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  • A neural network model for finding a near-maximum clique

    Nubuo Funabiki, Yoshiyasu Takefuji, Kuo-Chun Lee

    Journal of Parallel and Distributed Computing   14 ( 3 )   340 - 344   1992

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    A parallel algorithm based on the neural network model for finding a near-maximum clique is presented in this paper. A maximum clique of a graph G is a maximum complete subgraph of G where any two vertices are adjacent. The problem of finding a maximum clique is NP-complete. The parallel algorithm requires n processing elements for an n-vertex graph problem. The algorithm is verified by solving 230 different graph problems. The simulation results show that our computation time on a Macintosh IIfx is shorter than that of two better known algorithms on a Cray 2 and an IBM 3090 while the solution quality is similar. The algorithm solves a near-maximum clique problem in nearly constant time on a parallel machine with n processors. © 1992.

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  • A neural network parallel algorithm for clique vertex-partition problems

    Nobuo Funabiki, Yoshiyasu Takefuji, Kuo Chun Lee, Yong Beom Cho

    International Journal of Electronics   72 ( 3 )   357 - 372   1992

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    A parallel algorithm based on a neural network model for solving clique vertex-partition problems in arbitrary non-directed graphs is presented in this paper. A clique of a graph G = (V, E) with a set of vertices V and a set of edges E is a complete subgraph of G where any pair of vertices is connected with an edge. A clique vertex-partition problem of a graph G is to partition every vertex in V into a set of disjointed cliques of G. The clique vertex-partition problem with the minimum number of cliques in an arbitrary graph is known to be NP-complete. The algorithm requires nm processing elements for the n vertex m partition problem. A total of 10 different problems with 8 vertex to 300 vertex graphs were examined where the algorithm found a solution in nearly constant time. The circuit diagram of the neural network model is also proposed in this paper. © 1992 Taylor &amp
    Francis Ltd.

    DOI: 10.1080/00207219208925578

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  • A neural network parallel algorithm for clique vertex-partition problems

    Nobuo Funabiki, Yoshiyasu Takefuji, Kuo Chun Lee, Yong Beom Cho

    International Journal of Electronics   72 ( 3 )   357 - 372   1992

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    A parallel algorithm based on a neural network model for solving clique vertex-partition problems in arbitrary non-directed graphs is presented in this paper. A clique of a graph G = (V, E) with a set of vertices V and a set of edges E is a complete subgraph of G where any pair of vertices is connected with an edge. A clique vertex-partition problem of a graph G is to partition every vertex in V into a set of disjointed cliques of G. The clique vertex-partition problem with the minimum number of cliques in an arbitrary graph is known to be NP-complete. The algorithm requires nm processing elements for the n vertex m partition problem. A total of 10 different problems with 8 vertex to 300 vertex graphs were examined where the algorithm found a solution in nearly constant time. The circuit diagram of the neural network model is also proposed in this paper. © 1992 Taylor &amp
    Francis Ltd.

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  • A Neural Network Parallel Algorithm for Channel Assignment Problems in Cellular Radio Networks

    Nobuo Funabiki

    IEEE Transactions on Vehicular Technology   41 ( 4 )   430 - 437   1992

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    A parallel algorithm for channel assignment problems in cellular radio networks is presented in this paper. The channel assignment problem involves not only assigning channels or frequencies to each radio cell, but also satisfying frequency constraints given by a compatibility matrix. The proposed parallel algorithm is based on an artificial neural network composed of nm processing elements for an n-cell-m-frequency problem. The algorithm runs not only on a sequential machine but also on a parallel machine with up to a maximum of nm processors. The algorithm was tested by solving eight benchmark problems where the total number of frequencies varied from 100 to 533. The algorithm found the solutions in nearly constant time with nm processors. The simulation results showed that the algorithm found better solutions than the existing algorithm in one out of eight problems. © 1992 IEEE

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  • A Parallel Algorithm for Channel Routing Problems

    Nobuo Funabiki, Nobuo Funabiki, Yoshiyasu Takefuji

    IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems   11 ( 4 )   464 - 474   1992

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    A parallel algorithm for channel routing problems is presented in this paper. The channel routing problem is very important in the automatic layout design of VLSI circuits and printed circuit boards. The problem is to route the given interconnections between two rows of terminals on a multilayer channel where the channel area must be minimized. Although several algorithms have been proposed for two-layer problems, two-Iayer-and-over-the-cell problems, and three-layer problems, the current advancement of VLSI chip technology allows us to use four layers composed of two metal layers and two polysilicon layers for routing in a chip. The goal of the proposed parallel algorithm is to find the near-optimum routing solution for the given interconnections in a short time. The algorithm is applied for the four-layer channel routing problems where it requires n × m × 2 processing elements for the n-netm-track problem. The algorithm has three advantages over the conventional algorithms: 1) it can be easily modified for accommodating more than four-layer problems, 2) it runs not only on a sequential machine but also on a parallel machine with maximally n ×m × 2 processors, and 3) the program size is very small. The algorithm is verified by solving seven benchmark problems where the algorithm finds routing solutions in a nearly constant time with n × m × 2 processors. © 1992 IEEE

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  • A Parallel Algorithm for Channel Routing Problems

    Nobuo Funabiki, Nobuo Funabiki, Yoshiyasu Takefuji

    IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems   11 ( 4 )   464 - 474   1992

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    A parallel algorithm for channel routing problems is presented in this paper. The channel routing problem is very important in the automatic layout design of VLSI circuits and printed circuit boards. The problem is to route the given interconnections between two rows of terminals on a multilayer channel where the channel area must be minimized. Although several algorithms have been proposed for two-layer problems, two-Iayer-and-over-the-cell problems, and three-layer problems, the current advancement of VLSI chip technology allows us to use four layers composed of two metal layers and two polysilicon layers for routing in a chip. The goal of the proposed parallel algorithm is to find the near-optimum routing solution for the given interconnections in a short time. The algorithm is applied for the four-layer channel routing problems where it requires n × m × 2 processing elements for the n-netm-track problem. The algorithm has three advantages over the conventional algorithms: 1) it can be easily modified for accommodating more than four-layer problems, 2) it runs not only on a sequential machine but also on a parallel machine with maximally n ×m × 2 processors, and 3) the program size is very small. The algorithm is verified by solving seven benchmark problems where the algorithm finds routing solutions in a nearly constant time with n × m × 2 processors. © 1992 IEEE

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  • A Parallel Algorithm for Allocation of Spare Cells on Memory Chips

    Nobuo Funabiki, Yoshiyasu Takefuji

    IEEE Transactions on Reliability   40 ( 3 )   338 - 346   1991.8

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    In manufacturing memory chips, Redundant Random Access Memory (RRAM) technology has been widely used because it not only provides repair of faulty cells but also enhances the production yield. RRAM has several rows and columns of spare memory cells which are used to replace the faulty cells. The goal of our algorithm is to find a spare allocation which repairs all the faulty cells in the given faulty-cell map. The parallel algorithm requires In processing elements for the n x n faulty-cell map problem. The algorithm is verified by many simulation runs. Under the simulation the algorithm finds one of the near-optimum solutions in a nearly constant time with 0(n) processors. The simulation results show the consistency of our algorithm. The algorithm can be easily extended for solving rectangular or other shapes of fault map problems. Reader Aids - Purpose: Present a new algorithm Special math needed for explanations: Probability Special math needed to use results: None Results useful to: Reliability theoreticians and analysts. © 1991 IEEE

    DOI: 10.1109/24.85454

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  • A NEURAL NETWORK APPROACH TO BROADCASTING IN MULTIHOP PACKET RADIO NETWORKS

    N FUNABIKI, Y TAKEFUJI, KC LEE, YB CHO, T KUROKAWA, H AISO

    1991 IEEE INTERNATIONAL JOINT CONFERENCE ON NEURAL NETWORKS, VOLS 1-3   2540 - 2545   1991

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  • A NEURAL NETWORK APPROACH TO BROADCASTING IN MULTIHOP PACKET RADIO NETWORKS

    N FUNABIKI, Y TAKEFUJI, KC LEE, YB CHO, T KUROKAWA, H AISO

    1991 IEEE INTERNATIONAL JOINT CONFERENCE ON NEURAL NETWORKS, VOLS 1-3   2540 - 2545   1991

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Presentations

  • 換気指示精度向上のための空気調和適正化ガイダンスシステムの拡張

    坂上暢規, 濵﨑和志, 伊東翔, 永山智也, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告  2022.12 

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    Event date: 2023.1.10 - 2023.1.11

    Language:English   Presentation type:Oral presentation (general)  

  • An implementation of Docker image generation tool for user-PC computing system

    Lynn Htet Aung, Nobuo Funabiki, Hein Htet, Xudong Zhou, Xu Xiang, and Minoru Kuribayashi

    電子情報通信学会技術研究報告  2022.12 

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    Event date: 2023.1.10 - 2023.1.11

    Language:English   Presentation type:Oral presentation (general)  

  • IEEE802.15.4を用いた屋内位置検知システムの検知精度向上のための2つの拡張手法

    濵﨑和志, 霍元智, Pradini Puspitaningayu, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告  2022.12 

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    Event date: 2022.12.15 - 2022.12.16

    Language:Japanese   Presentation type:Oral presentation (general)  

  • A feasibility study of interface setup optimization method using throughput estimation model for concurrently communicating three access-points in wireless local-area network

    Fatema Akhter, Nobuo Funabiki, Bin Wu, Melki Mario Gulo, Sujan Chandra Roy, and Minoru Kuribayashi

    電子情報通信学会技術研究報告  2022.12 

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    Event date: 2022.12.15 - 2022.12.16

    Language:English   Presentation type:Oral presentation (general)  

  • 美術教育における鉛筆静物デッサン画の特徴量計算のための Python プログラムの実装

    古性淑子, 小谷一孔, 魯希琴, 舩曵信生

    電子情報通信学会技術研究報告  2022.12 

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    Event date: 2022.12.10

    Language:Japanese   Presentation type:Oral presentation (general)  

  • An extension of throughput request satisfaction method to throughput maximization for concurrently communicating hosts in wireless local-area network with two access-points

    Bin Wu, Nobuo Funabiki, Md. Mahbubur Rahman, Sujan Chandra Roy, Yuan-Shuai Sun, and Minoru Kuribayashi

    電子情報通信学会技術研究報告  2022.11 

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    Event date: 2022.11.24 - 2022.11.25

    Language:English   Presentation type:Oral presentation (general)  

  • A study of active access-point aonfiguration algorithm under IEEE 802.11n and 11ac dual interfaces with channel bonding in wireless local-area network

    Sujan Chandra Roy, Nobuo Funabiki, Md. Mahbubur Rahman, Yuanshuai Sun, Bin Wu, and Minoru Kuribayashi

    電子情報通信学会技術研究報告  2022.11 

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    Event date: 2022.11.24 - 2022.11.25

    Language:English   Presentation type:Oral presentation (general)  

  • Detection accuracy evaluations under user movements for fingerprint-based indoor localization system using IEEE 802.15.4

    Xinyu Wu, Pradini Puspitaningayu, Nobuo Funabiki, Yohanes Yohanie Fridelin Panduman, Yuanzhi Huo, and Minoru Kuribayashi

    2022 IEEE Hiroshima Section Student Symposium (HISS2022)  2022.11 

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    Event date: 2022.11.19 - 2022.11.20

    Language:English   Presentation type:Oral presentation (general)  

  • Performance comparisons for IEEE 802.11n/ac dual interface usage of Raspberry Pi access-point with external NIC in wireless local-area network

    Yuanshuai Sun, Sujan Chandra Roy, Nobuo Funabiki, Md. Mahbubur Rahman, Bin Wu, and Minoru Kuribayashi

    2022 IEEE Hiroshima Section Student Symposium (HISS2022)  2022.11 

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    Event date: 2022.11.19 - 2022.11.20

    Language:English   Presentation type:Oral presentation (general)  

  • A proposal of alternative answer search method for phrase fill-in-blank problems in C programming

    Xiqin Lu, Nobuo Funabiki, Zhikang Li, and Kiyoshi Ueda

    情報処理学会研究報告, コンピュータと教育研究会  2022.10 

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    Event date: 2022.10.1

    Language:English   Presentation type:Oral presentation (general)  

  • A study of element fill-in-blank problems for applicative grammar topics in JavaScript-based web-client programming

    Huiyu Qi, Nobuo Funabiki, Khaing Hsu Wai, May Zin Htun, Khin Thet Mon, and Wen-Chung Kao

    情報処理学会研究報告, コンピュータと教育研究会  2022.10 

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    Event date: 2022.10.1

    Language:English   Presentation type:Oral presentation (general)  

  • An objective article search method from printed Japanese contract document using optical character recognition

    Shixi Chen, Masaki Sakagami, Nobuo Funabiki, Takashi Toshida, and Kohei Suga

    電子情報通信学会技術研究報告  2022.1 

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    Event date: 2022.1.27

    Language:English   Presentation type:Oral presentation (general)  

  • An application of grammar-concept understanding problem for advanced grammar keywords in C programming

    Xiqin Lu, Yanhui Jing, Soe Thandar Aung, Nobuo Funabiki, and Kiyoshi Ueda

    IEEE Hiroshima Section Student Symposium (HISS2021)  2021.11 

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    Event date: 2021.11.27 - 2021.11.28

    Language:English   Presentation type:Oral presentation (general)  

  • 2段組契約文書の文字認識のための1段組変換方法

    坂上暢規, 陳仕璽, 舩曵信生, 土信田高, 菅恒平

    IEEE広島支部学生シンポジウム  2021.11 

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    Event date: 2021.11.27 - 2021.11.28

    Language:Japanese   Presentation type:Oral presentation (general)  

  • 空調環境適正化ガイダンスシステムでの換気指示機能の実装

    坂上暢規, 霍元智, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告  2021.5 

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    Event date: 2021.5.10 - 2021.5.11

    Language:Japanese   Presentation type:Oral presentation (general)  

  • A study of fingerprint parameter optimization method for indoor localization system using IEEE802.15.4 devices

    Yuanzhi Huo, Pradini Puspitaningayu, Kazushi Hamazaki, Nobuo Funabiki, Minoru Kuribayashi, and Kazuyuki Kojima

    2021.5 

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    Event date: 2021.5.10 - 2021.5.11

    Language:English   Presentation type:Oral presentation (general)  

  • IEEE802.15.4プロトコルを用いた屋内位置検知システムの複数ユーザ対応のための拡張

    濵﨑和志, Pradini Puspitaningayu, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告  2021.5 

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    Event date: 2021.5.10 - 2021.5.11

    Language:Japanese   Presentation type:Oral presentation (general)  

  • プログラミング学習支援システムの解答分析機能の拡張

    西村一輝, 岩本晃司郎, Htoo Htoo Sandy Kyaw, 舩曵信生, 栗林稔

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    Event date: 2021.5.10 - 2021.5.11

    Language:Japanese   Presentation type:Oral presentation (general)  

  • A study of product identification system using optical character recognition

    Shixi Chen, Nobuo Funabiki, Masaki Sakagami, Takashi Toshida, and Kohei Suga

    電子情報通信学会技術研究報告  2021.3 

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    Event date: 2021.3.4

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  • A study of code completion problem for C programming learning assistant system International coauthorship

    Htoo Htoo Sandi Kyaw, Nobuo Funabiki, Minoru Kuribayashi, Thandar Myint, and Hnin Aye Thant

    電子情報通信学会技術研究報告  2021.1 

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    Event date: 2021.1.21 - 2021.1.22

    Language:English   Presentation type:Oral presentation (general)  

  • Implementation and performance evaluation of unit testing in Android programming learning assistance system

    Yan Watequlis Syaifudin, Nobuo Funabiki, and Minoru Kuribayashi

    電子情報通信学会技術研究報告  2021.1 

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    Event date: 2021.1.21 - 2021.1.22

    Language:English   Presentation type:Oral presentation (general)  

  • An implementation of fingerprint-based indoor positioning system using IEEE 802.15.4

    Pradini Puspitaningayu, Kazushi Hamazaki, Nobuo Funabiki, Hein Htet, and Minoru Kuribayashi

    電子情報通信学会技術研究報告  2021.1 

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    Event date: 2021.1.21 - 2021.1.22

    Language:English   Presentation type:Oral presentation (general)  

  • An implementation of hint Function for element fill-in-blank problems at offline answering function in Java programming learning assistant system

    Su Sandy Wint, Nobuo Funabiki, and Minoru Kuribayashi

    電子情報通信学会技術研究報告  2021.1 

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    Event date: 2021.1.21 - 2021.1.22

    Language:English   Presentation type:Oral presentation (general)  

  • Evaluations of air-conditioning guidance system in hot days

    Samsul Huda, Nobuo Funabiki, Minoru Kuribayashi, Sakagami Masaki, Nobuya Ishihara

    IEEE Hiroshima Section Student Symposium (HISS2020)  2020.11.28 

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    Event date: 2020.11.28 - 2020.11.29

    Language:English   Presentation type:Oral presentation (general)  

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  • Javaプログラミングの4つの応用的トピックに対する空欄語補充問題の作成と評価

    林程嘉, Htoo Htoo Sandi Kyaw, 舩曵信生, 栗林稔

    2020 IEEE Hiroshima Section Student Symposium (HISS2020) 

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    Event date: 2020.11.28 - 2020.11.29

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Javaプログラミング学習支援システムのサーバポータブル化のためのデータベースレス実装

    岩本晃司郎,舩曵信生,石原信也, 栗林稔

    第71回電気・情報関連学会中国支部連合大会 

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    Event date: 2020.10.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • An implementation of improved recommendation function for element fill-in-blank problem at offline answering function in Java programming learning assistant system

    Su Sandy Wint, Nobuo Funabiki, Minoru Kuribayashi, nd Yan Watequlis Syaifudin

    電子情報通信学会技術研究報告, KBSE2020-3  2020.9.18 

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    Event date: 2020.9.18 - 2020.9.19

    Language:English   Presentation type:Oral presentation (general)  

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  • A study of grammar-concept understanding problem for Java programming learning assistant system

    Soe Thandar Aung, Nobuo Funabiki, Yan Watequlis Syaifudin, and Minoru Kuribayashi

    電子情報通信学会技術研究報告 

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    Event date: 2020.9.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:北陸先端科学技術大学院大学  

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  • A study of element fill-in-blank problem with blank element selection algorithm for C programming learning assistant system

    Htoo Htoo Sandi Kyaw, Nobuo Funabiki, and Minoru Kuribayashi

    電子情報通信学会技術研究報告 

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    Event date: 2020.9.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:北陸先端科学技術大学院大学  

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  • An investigation of fingerprint-based room detection method using IEEE 802.15.4 wireless network

    Pradini Puspitaningayu, Nobuo Funabiki, Rahardhita Widyatra Sudibyo, and Minoru Kuribayashi

    電子情報通信学会技術研究報告 

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    Event date: 2020.6.18 - 2020.6.19

    Language:English   Presentation type:Oral presentation (general)  

    Venue:香川県立ミュージアム  

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  • An improvement of TCP throughput fairness control method for concurrent communications in elastic WLAN system

    Md. Mahbubur Rahman, Nobuo Funabiki, Rahardhita Widyatra Sudibyo, Kwenga Ismael Munene, Hendy Briantoro, and Md. Manowarul Islam

    電子情報通信学会技術研究報告 

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    Event date: 2020.6.18 - 2020.6.19

    Language:English   Presentation type:Oral presentation (general)  

    Venue:香川県立ミュージアム  

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  • Design and Implementation of Improved User-PC Computing System

    Hein Htet, Nobuo Funabiki, Ariel kamoyedji, and Minoru Kuribayashi

    電子情報通信学会技術研究報告 

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    Event date: 2020.6.18 - 2020.6.19

    Language:English   Presentation type:Oral presentation (general)  

    Venue:香川県立ミュージアム  

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  • An extension of throughput estimation model for three-link concurrent communications under partially overlapping channels without channel bonding in IEEE 802.11n WLAN

    Ismael Munene Kwenga, Nobuo Funabiki, Hendy Briantoro, Md. Mahbubur Rahman, and Minoru Kuribayashi

    電子情報通信学会技術研究報告 

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    Event date: 2020.6.18 - 2020.6.19

    Language:English   Presentation type:Oral presentation (general)  

    Venue:香川県立ミュージアム  

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  • An extension of transmission power optimization method for two concurrently communicating access-points associated with multiple hosts in wireless local-area network

    Hendy Briantoro, Nobuo Funabiki, Kwenga Ismael Munene, Rahardhita Widyatra Sudibyo, Md. Mahbubur Rahman, and Minoru Kuribayashi

    電子情報通信学会技術研究報告 

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    Event date: 2020.6.18 - 2020.6.19

    Language:English   Presentation type:Oral presentation (general)  

    Venue:香川県立ミュージアム  

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  • An improvement of air-conditioning guidance system with outdoor discomfort index for avoiding false messages

    Samsul Huda, Nobuo Funabiki, Minoru Kuribayashi, Rahardhita Widyatra Sudibyo, and Nobuya Ishihara

    電子情報通信学会技術研究報告 

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    Event date: 2020.6.18 - 2020.6.19

    Language:English   Presentation type:Oral presentation (general)  

    Venue:香川県立ミュージアム  

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  • Java プログラミング学習支援システムのコードクローン除去問題におけるクラス間文法適正化課題の提案

    石原信也, 舩曵信生

    2019 IEEE Hiroshima Section Student Symposium (HISS2019) 

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    Event date: 2019.11.30 - 2019.12.1

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山県立大学  

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  • A proposal of preprocessing stage for active access-point configuration algorithm in elastic WLAN system

    Mousumi Saha, Nobuo Funabiki, Sumon Kumar Debnath, and Md. Selim Al Mamun

    2019 IEEE Hiroshima Section Student Symposium (HISS2019) 

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    Event date: 2019.11.30 - 2019.12.1

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山県立大学  

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  • An exploration of transmission power optimization method for concurrently communicating two access-points in wireless local-area network

    Hendy Briantoro, Nobuo Funabiki, Md Manowarul Islam, Rahardhita Widyatra Sudibyo, Kwenga Ismael Munene, and Minoru Kuribayashi

    2019 IEEE Hiroshima Section Student Symposium (HISS2019) 

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    Event date: 2019.11.30 - 2019.12.1

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山県立大学  

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  • 無線LANの複数ホスト同時通信時におけるスループット予測モデルの改良

    盧天鵬, 舩曵信生, マノワールイスラム, クエンガイスラムムネネ, ラハディタウイディトラスディビョ

    2019 IEEE Hiroshima Section Student Symposium (HISS2019) 

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    Event date: 2019.11.30 - 2019.12.1

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山県立大学  

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  • Word文書ファイルの個別入力データ抽出法の提案

    李?昊, 舩曵信生, 栗林稔, 石原信也

    電子情報通信学会技術研究報告 

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    Event date: 2019.3.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川高等専門学校(詫間キャンパス)  

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  • An extension of recommendation function in topic coverage for element fill-in-blank problems in Java programming learning assistant system

    Su Sandy Wint, Nobuo Funabiki, and Minoru Kuribayashi

    電子情報通信学会技術研究報告 

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    Event date: 2019.3.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:香川高等専門学校(詫間キャンパス)  

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  • Three improvements for code completion problem in Java programming learning assistant system

    Htoo Htoo Sandi Kyaw, Nobuo Funabiki, Minoru Kuribayashi, and Khin Khin Zaw

    情報処理学会研究報告, プログラミング研究会 

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    Event date: 2019.1.17 - 2019.1.18

    Language:English   Presentation type:Oral presentation (general)  

    Venue:福山市ものづくり交流館  

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  • Javaプログラミング学習支援システムの解答状況可視化および問題推薦機能の実装

    松本慎平, 舩曵信生, 栗林稔

    情報処理学会研究報告, プログラミング研究会 

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    Event date: 2019.1.17 - 2019.1.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福山市ものづくり交流館  

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  • Javaプログラミング学習支援システムのコード修正問題の3つの改良

    何賽, 舩曵信生, 栗林稔

    情報処理学会研究報告, プログラミング研究会 

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    Event date: 2019.1.17 - 2019.1.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福山市ものづくり交流館  

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  • テストログを用いたテストコード生成支援ツールの戻り値のあるJavaメソッドへの拡張

    日下涼太, 舩曵信生, 栗林稔, 石原信也

    電子情報通信学会技術研究報告  2018 

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    Event date: 2018.1.18 - 2018.1.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島市立大学サテライトキャンパス  

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  • Javaプログラミング学習支援システムJPLASへのソースコード管理システムの導入

    松本慎平, 舩曵信生, 栗林稔, 石原信也

    電子情報通信学会技術研究報告  2018 

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    Event date: 2018.1.18 - 2018.1.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島市立大学サテライトキャンパス  

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  • Javaプログラミング学習支援システムのテストコード学習のためのコード修正問題の提案

    何賽, 舩曵信生, 栗林稔, 石原信也

    電子情報通信学会技術研究報告  2018 

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    Event date: 2018.1.18 - 2018.1.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島市立大学サテライトキャンパス  

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  • A minimax approach for access-point setup optimization in IEEE 802.11n WLAN with MIMO links

    Kyaw Soe Lwin, Nobuo Funabiki, Sumon Kumar Debnathy, and Munene Kwenga Ismael

    第19回IEEE広島支部学生シンポジウム  2017 

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    Event date: 2017.12.2 - 2017.12.3

    Language:English   Presentation type:Poster presentation  

    Venue:島根大学  

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  • A study of throughput estimation model for IEEE802.11n MIMO link in wireless local-area network

    Sumon Kumar Debnath, Nobuo Funabiki, Kyaw Soe Lwin, and Md. Selim Al Mamun

    電子情報通信学会技術研究報告  2017 

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    Event date: 2017.11.16 - 2017.11.17

    Language:English   Presentation type:Oral presentation (general)  

    Venue:高松センタービル  

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  • A study of throughput estimation model and channel assignment algorithm for partially overlapping channels in IEEE 802.11n wireless local-area networks

    Kwenga Ismael Munene, Nobuo Funabiki, Md. Selim Al Mamun, Kyaw Soe Lwin, and Sumon Kumar Debnath

    電子情報通信学会技術研究報告  2017 

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    Event date: 2017.11.16 - 2017.11.17

    Language:English   Presentation type:Oral presentation (general)  

    Venue:高松センタービル  

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  • An informative test code approach for code writing problem in Java programming learning assistant system

    Khin Khin Zaw and Nobuo Funabiki

    電子情報通信学会技術研究報告  2017 

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    Event date: 2017.10.19 - 2017.10.20

    Language:English   Presentation type:Oral presentation (general)  

    Venue:高知市文化プラザかるぽーと  

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  • Javaプログラミング学習支援システムのコードクローン除去問題におけるメソッド生成課題の改善

    石原信也, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告  2017 

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    Event date: 2017.10.19 - 2017.10.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:高知市文化プラザかるぽーと  

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  • Element fill-in-blank problems in Java programming learning assistant system

    Khin Khin Zaw, Nobuo Funabiki, and Minoru Kuribayashi

    IEICE General Conference  2017 

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    Event date: 2017.3.22 - 2017.3.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 無線LANの保有アクセスポイント割当問題のチャネル割当におけるチャネル間干渉の考慮

    田島滋人, 舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告  2017 

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    Event date: 2017.1.26 - 2017.1.27

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Javaプログラミング学習支援システムにおけるコードクローン除去問題の提案 International conference

    石原信也, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告  2017 

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    Event date: 2017.1.26 - 2017.1.27

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Javaプログラミング学習のための命名規則検査ツールの改良 International conference

    松本慎平, 舩曵信生, 栗林稔, 石原信也

    電子情報通信学会技術研究報告  2017 

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    Event date: 2017.1.26 - 2017.1.27

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Raspberry Pi configuration for access-point and its throughput measurements in IEEE802.11n wireless networks

    Sumon Kumar Debnath, Nobuo Funabiki, Kyaw Soe Lwin, Md. Selim Al Mamun, Rahardhita Widyatra Sudibyo, and Samsul Huda

    電子情報通信学会技術研究報告  2016 

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    Event date: 2016.12.21 - 2016.12.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • パラメータ最適化ツールの開発と無線LANのスループット推定モデルへの適用

    谷口知弘, 舩曵信生, 栗林稔, Kyaw Soe Lwin, Debnath Sumon Kumar, and Khin Khin Zaw

    電子情報通信学会技術研究報告  2016 

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    Event date: 2016.12.21 - 2016.12.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 無線LANの保有アクセスポイント割当アルゴリズムのチャネル割当拡張

    田島滋人, 舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告  2016 

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    Event date: 2016.12.21 - 2016.12.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Javaプログラミング学習支援システムJPLASの課題提示およびオフライン学習機能の実装

    佐々木伸, 舩曵信生, 栗林稔, 石原信也

    電子情報通信学会技術研究報告  2016 

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    Event date: 2016.12.10

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Javaプログラミング学習支援システムJPLASのコード作成問題のオフライン解答機能

    王穎キン, 舩曵信生, 栗林稔, 石原信也

    電子情報通信学会技術研究報告  2016 

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    Event date: 2016.12.10

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  • Javaプログラミング学習支援システムJPLASの空欄補充問題のキャラクタ付き解答インターフェースの提案

    唐楽薇,舩曵信生, 石原信也, 栗林稔

    2016 IEEE Hiroshima Section Student Symposium (HISS2016)  2016 

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    Event date: 2016.11.19 - 2016.11.20

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A blank element selection algorithm extension for algorithm code reading by fill-in-blank problems in Java programming learning assistant system

    Khin Khin Zaw and Nobuo Funabiki

    2016 IEEE Hiroshima Section Student Symposium (HISS2016)  2016 

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    Event date: 2016.11.19 - 2016.11.20

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Preliminary evaluation of blank element selection algorithm extension for fill-in-blank problem in Java programming learning assistant system

    Khin Khin Zaw and Nobuo Funabiki

    IEICE Society Conference  2016 

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    Event date: 2016.9.20 - 2016.9.23

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Throughput measurements for access-point setup optimization in IEEE802.11n wireless networks

    Kyaw Soe Lwin, Nobuo Funabiki, Khin Khin Zaw, Md. Selim Al Mamun, and Minoru Kuribayashi

    電子情報通信学会技術研究報告  2016 

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    Event date: 2016.7.20 - 2016.7.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Javaプログラミング学習支援システムJPLASのMVCモデルに沿ったコード記述ルールの提案とその再構築

    石原信也, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告  2016 

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    Event date: 2016.6.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Javaプログラミング学習支援システムJPLASのテストコード自動生成ツールの提案

    日下涼太, 舩曵信生, 栗林稔, 石原信也

    電子情報通信学会技術研究報告  2016 

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    Event date: 2016.6.11

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  • Extensions of blank element selection algorithm for Java programming learning assistant system

    Khin Khin Zaw, Nobuo Funabiki, and Minoru Kuribayashi

    電子情報通信学会技術研究報告  2016 

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    Event date: 2016.6.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 無線LANの保有アクセスポイント割当手法の一検討

    青柳有輝, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告  2016 

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    Event date: 2016.4.21 - 2016.4.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Evaluations of access-point configuration algorithm under limited mobile router allocations

    Md. Selim Al Mamun, Md. Ezharul Islam, Sumon Kumar Debnath, and Nobuo Funabiki

    IEICE General Conference  2016 

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    Event date: 2016.3.15 - 2016.3.18

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Throughput measurements with various indoor AP placement conditions for IEEE802.11n wireless networks

    Kyaw Soe Lwin, Nobuo Funabiki, and Md. Ezharul Islam

    IEICE General Conference  2016 

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    Event date: 2016.3.15 - 2016.3.18

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Performance evaluations of elastic WLAN testbed

    Md. Ezharul Islam, Nobuo Funabiki, Kyaw Soe Lwin, Md. Selim Al Mamun, Sumon Kumar Debnath, and Minoru Kuribayashi

    IEICE General Conference  2016 

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    Event date: 2016.3.15 - 2016.3.18

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • UPCシステムにおけるベンチマーク測定結果を用いたジョブスケジューリングの提案

    青柳有輝, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告  2016 

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    Event date: 2016.1.25 - 2016.1.26

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Elastic WLAN system model and its implementation on Linux-PC

    Md. Ezharul Islam, Nobuo Funabiki, Minoru Kuribayashi

    電子情報通信学会技術研究報告  2016 

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    Event date: 2016.1.25 - 2016.1.26

    Language:English   Presentation type:Oral presentation (general)  

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  • A study of value trace problems for graph theory algorithms in Java programming learning assistant system

    Khin Khin Zaw, Nobuo Funabiki, Minoru Kuribayashi

    電子情報通信学会技術研究報告  2016 

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    Event date: 2016.1.25 - 2016.1.26

    Language:English   Presentation type:Oral presentation (general)  

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  • Javaプログラミングにおけるリーダブルコード学習ツールの提案

    小川卓也, 舩曵信生, 栗林稔, 石原信也, 天野憲樹

    電子情報通信学会技術研究報告  2016 

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    Event date: 2016.1.25 - 2016.1.26

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Eclipse上でのテストコードを用いたJavaプログラミング演習の実践

    王穎?, 舩曵信生, キン・キン・ゾウ, 石原信也

    第17回IEEE広島支部学生シンポジウム(HISS)  2015 

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    Event date: 2015.11.21 - 2015.11.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Throughput measurements in outdoor environment with different AP placement heights and orientations for IEEE802.11n wireless networks

    Kyaw Soe Lwin, Nobuo Funabiki, Md. Ezharul Islam, Chang Choon Chew, Yuma Tani

    第17回IEEE広島支部学生シンポジウム(HISS)  2015 

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    Event date: 2015.11.21 - 2015.11.22

    Language:English   Presentation type:Oral presentation (general)  

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  • A value trace problem for Prim algorithm in graph theory in Java programming learning assistant system

    Khin Khin Zaw, Nobuo Funabiki

    第17回IEEE広島支部学生シンポジウム(HISS)  2015 

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    Event date: 2015.11.21 - 2015.11.22

    Language:English   Presentation type:Oral presentation (general)  

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  • ユーザPCコンピューティングシステムにおけるジョブスケジューリングのためのワーカPC性能のベンチマーク評価

    青柳有輝, 舩曵信生, 浅井祐介

    第17回IEEE広島支部学生シンポジウム(HISS)  2015 

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    Event date: 2015.11.21 - 2015.11.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • IEEE802.11ac のシングルユーザMIMO での複数ホスト通信時のスループット測定

    谷祐馬 舩曵信生, キオー・ソイ・ルウィン, チュウ・チャン・チョン

    第17回IEEE広島支部学生シンポジウム(HISS)  2015 

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    Event date: 2015.11.21 - 2015.11.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Measurement results of three indices for IEEE802.11n wireless networks in outdoor environments

    Md. Ezharul Islam, Kyaw Soe Lwin, Md. Selim Al Mamun, Nobuo Funabiki, I-Wei Lai

    第17回IEEE広島支部学生シンポジウム(HISS)  2015 

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    Event date: 2015.11.21 - 2015.11.22

    Language:English   Presentation type:Oral presentation (general)  

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  • Evaluations of active access-point configuration algorithm with dynamic mobile router placement under various mobile router speeds and wall effects

    Md. Selim Al Mamun, Md. Ezharul Islam, Nobuo Funabiki, I-Wei Lai

    第17回IEEE広島支部学生シンポジウム(HISS)  2015 

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    Event date: 2015.11.21 - 2015.11.22

    Language:English   Presentation type:Oral presentation (general)  

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  • Javaプログラミング学習支援システムにおけるエレメント空欄補充問題の演算子空欄化拡張

    佐々木伸, 舩曵信生, 石原信也, 塔娜

    第66回電気・情報関連学会中国支部連合大会  2015 

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    Event date: 2015.10.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Javaプログラミング学習支援システムにおけるコードリーディング学習のためのコーディング規約検査ツールの調査

    小川卓也, 舩曵信生, 石原信也

    第66回電気・情報関連学会中国支部連合大会  2015 

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    Event date: 2015.10.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 調理作業最適化のためのレシピ変換アルゴリズムの提案

    松島由紀子, 舩曵信生

    電子情報通信学会技術研究報告  2015 

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    Event date: 2015.9.10 - 2015.9.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Drawbacks and countermeasures of element fill-in-blank problem in Java programming learning assistant system

    Tana, Nobuo Funabiki

    IEICE Communication Society Conference  2015 

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    Event date: 2015.9.8 - 2015.9.11

    Language:English   Presentation type:Oral presentation (general)  

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  • A blank line selection algorithm for value trace problem in Java programming learning assistant system

    Khin Khin Zaw, Nobuo Funabiki

    IEICE Communication Society Conference  2015 

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    Event date: 2015.9.8 - 2015.9.11

    Language:English   Presentation type:Oral presentation (general)  

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  • WIMNETシミュレータを用いたマルチユーザMIMOの通信性能評価

    田島滋人, 舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告  2015 

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    Event date: 2015.7.29 - 2015.7.31

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • An active acess-point configuration algorithm for wireless local area networks with heterogeneous devices

    Md. Selim Al Mamun, Md. Ezharul Islam, Nobuo Funabiki

    電子情報通信学会技術研究報告  2015 

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    Event date: 2015.7.29 - 2015.7.31

    Language:English   Presentation type:Oral presentation (general)  

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  • ユーザPCコンピューティングシステムにおけるワーカ機能のWindows実装と評価

    浅井祐介, 舩曵信生, 青柳有輝

    電子情報通信学会技術研究報告  2015 

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    Event date: 2015.7.29 - 2015.7.31

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 大規模無線メッシュネットワークのための動作アクセスポイント選択アルゴリズム

    藤田翔, 舩曵信生

    電子情報通信学会技術研究報告  2015 

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    Event date: 2015.3.2 - 2015.3.3

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ユーザPCコンピューティングシステムのジョブスケジューリング法の実装と評価

    青柳有輝, 舩曵信生, 福士将

    電子情報通信学会技術研究報告  2015 

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    Event date: 2015.3.2 - 2015.3.3

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 学生用PCを用いたユーザPCコンピューティングシステムのWebインタフェース

    金奉洙, 舩曵信生

    情報処理学会研究報告  2015 

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    Event date: 2015.2.14 - 2015.2.15

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Javaプログラミング授業におけるエレメント空欄補充問題の実践

    塔娜, 舩曵信生, 石原信也

    情報処理学会研究報告  2015 

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    Event date: 2015.2.14 - 2015.2.15

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Javaコードのクラス間連携理解のためのコアステートメント抽出アルゴリズム

    石原信也, 舩曵信生

    情報処理学会研究報告  2015 

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    Event date: 2015.2.14 - 2015.2.15

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • マルチユーザMIMOにおけるアンテナ割当方式の一検討

    田島滋人, 舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.11.25

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  • 無線メッシュネットワークにおける現実的環境を考慮した動作アクセスポイント選択アルゴリズムの拡張

    藤田翔, 舩曵信生

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.11.25

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  • ユーザPCコンピューティングシステムの基本機能の実装と評価

    青柳有輝, 舩曵信生, 福士将

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.11.25

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  • Java プログラミング学習支援システムのためのメトリクス計測によるコード可読性評価の検討

    谷口知弘, 舩曵信生, 石原信也

    第16回IEEE広島支部学生シンポジウム(HISS)  2014 

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    Event date: 2014.11.15 - 2014.11.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • サーバに対して回答内容を秘匿したオンラインアンケートシステムにおける回答処理の実装

    佐藤淳史, 中西透, 舩曵信生

    第65回電気・情報関連学会中国支部連合大会  2014 

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    Event date: 2014.10.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ユーザPCコンピューティングシステムの開発と評価

    青柳有輝, 舩曵信生, 福士将

    第65回電気・情報関連学会中国支部連合大会  2014 

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    Event date: 2014.10.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 2階層のPKIに対応した匿名属性認証方式の提案

    水谷健太郎, 中西透, 舩曵信生

    第65回電気・情報関連学会中国支部連合大会  2014 

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    Event date: 2014.10.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Javaプログラミング学習のための空欄語選択アルゴリズムの提案

    塔娜, 舩曵信生, 石原信也

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.10.23 - 2014.10.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A study of access-point allocation algorithm for scalable wireless mesh networks in indoor environments

    Tamer Farag, Nobuo Funabiki, and Walaa Hassan

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.10.16 - 2014.10.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • MU-MIMOのためのWIMNETシミュレータ拡張の一検討

    田島滋人, 舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.10.16 - 2014.10.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • An extension of access-point aggregation algorithm for host mobility

    Md. Ezharul Islam, Nobuo Funabiki

    電子情報通信学会ソサイエティ大会  2014 

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    Event date: 2014.9.23 - 2014.9.26

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Throughput measurements in big room with different access point locations for IEEE 802.11ac wireless networks

    Chew Chang Choon, Nobuo Funabiki

    電子情報通信学会ソサイエティ大会  2014 

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    Event date: 2014.9.23 - 2014.9.26

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 作業時間変化に対する調理手順最適化アルゴリズムのロバスト性評価

    松島由紀子, 舩曵信生

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.9.18 - 2014.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Efficient proofs for monotone formulas on attributes excluding restriction in anonymous credential system

    Shahidatul Sadiah, Toru Nakanishi, and Nobuo Funabiki

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.9.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 無線メッシュネットワークの経路アルゴリズムのフレームアグリゲーション考慮のための拡張

    谷祐馬, 舩曳信生, 田島滋人

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.6.26 - 2014.6.27

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • An extension of access point allocation algorithm for wireless mesh networks with multiple gateways and maximum hop limitation

    Tamer Farag, Nobuo Funabiki, and Walaa Hassan

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.6.26 - 2014.6.27

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  • Throughput evaluations using NS2 for access-point aggregation algorithm in IEEE802.11n wireless LANs

    Walaa Hassan, Nobuo Funabiki, and Tamer Farag

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.6.26 - 2014.6.27

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  • Javaプログラミング学習支援システムのための空欄補充問題生成アルゴリズムの拡張

    塔娜, 舩曵信生, 石原信也

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.6.14

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  • Javaプログラミング学習支援システムのコードの記述ルールの検討

    石原信也, 舩曵信生

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.6.14

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  • Javaプログラミング学習支援システムにおける空欄補充問題の難易度推定法

    小川卓也, 舩曵信生, 中西透, 石原信也, 塔娜, 天野憲樹

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Javaプログラミング学習支援システムにおけるステートメント補充問題機能の実装,

    石原信也, 舩曵信生, 中西透

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • フレームアグリゲーションのためのWIMNETシミュレータの拡張

    田島滋人, 舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.3.6 - 2014.3.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 無線メッシュネットワークの動作アクセスポイント選択アルゴリズムの現実的環境考慮のための拡張

    藤田翔, 舩曵信生, 中西透

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.3.6 - 2014.3.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • File synchronization performance using BitTorrent Sync in IEEE802.11ac wireless networks

    Kim Bongsu, Nobuo Funabiki, Toru Nakanishi

    IEICE Technical Report  2014 

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    Event date: 2014.3.6 - 2014.3.7

    Language:English   Presentation type:Oral presentation (general)  

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  • Throughput Measurements Using IEEE 802.11ac Devices for High-Speed Wireless Networks

    Chew Chang Choon, Nobuo Funabiki, and Walaa Hassan

    IEICE Technical Report  2014 

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    Event date: 2014.3.6 - 2014.3.7

    Language:English   Presentation type:Oral presentation (general)  

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  • 調理手順スケジューリングのためのWeb公開レシピー変換アルゴリズム

    張一加, 舩曵信生, 中西透

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.1.30 - 2014.1.31

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Javaプログラミング学習支援システムのコード作成問題におけるJavadocを用いたヒント機能

    中村拓哉, 舩曵信生, 中西透, 天野憲樹

    電子情報通信学会技術研究報告  2014 

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    Event date: 2014.1.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • An extension of access-point allocation algorithm for adapting link speed change in wireless mesh network

    Tamer Farag, Nobuo Funabiki, and Walaa Hassan

    IEICE Technical Report  2013 

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    Event date: 2013.12.20 - 2013.12.21

    Language:English   Presentation type:Oral presentation (general)  

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  • 現実的環境下での大規模無線メッシュネットワークのための経路木アルゴリズムの提案

    丸山渉, 舩曵信生, 中西透

    電子情報通信学会技術研究報告  2013 

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    Event date: 2013.12.20 - 2013.12.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • An extension of age range proof in anonymous credential system using monotone formula International conference

    Shahidatul Sadiah, Toru Nakanishi, Kan Watanabe, Nobuo Funabiki

    第64回電気・情報関連学会中国支部連合大会  2013 

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    Event date: 2013.10.19

    Language:English   Presentation type:Oral presentation (general)  

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  • Javaプログラミング学習のためのステートメント補充問題の生成機能 International conference

    石原信也, 舩曵信生, 中西透, 渡邊寛

    第64回電気・情報関連学会中国支部連合大会  2013 

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    Event date: 2013.10.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 否定的な評価を考慮した強固な秘匿性を持つ評価システムのWeb実装 International conference

    中田博之, 中西透, 渡邊寛, 舩曵信生

    第64回電気・情報関連学会中国支部連合大会  2013 

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    Event date: 2013.10.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 調理手順最適化のためのWeb公開レシピー変換アルゴリズムの提案 International conference

    張一加, 舩曵信生, 中西透, 渡邊寛

    第64回電気・情報関連学会中国支部連合大会  2013 

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    Event date: 2013.10.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Throughput measurements using IEEE 802.11n and 11ac devices for high-speed wireless networks International conference

    Chew Chang Choon, Nobuo Funabiki, Toru Nakanishi, and Kan Watanabe

    第64回電気・情報関連学会中国支部連合大会  2013 

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    Event date: 2013.10.19

    Language:English   Presentation type:Oral presentation (general)  

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  • グラフ理論を用いたJavaエレメント補充問題生成アルゴリズムの提案 International conference

    塔娜, 舩曵信生, 中西透, 渡邊寛

    第64回電気・情報関連学会中国支部連合大会  2013 

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    Event date: 2013.10.19

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  • 効率的に年齢の大小関係を証明可能な匿名属性認証方式の提案

    丸山渉, 舩曵信生, 中西透

    電子情報通信学会技術研究報告  2013 

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    Event date: 2013.9.13

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 無線メッシュネットワークにおけるリンク速度を考慮したクラスタ分割アルゴリズム

    田島滋人, 舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告  2013 

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    Event date: 2013.7.17 - 2013.7.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • オープンソースソフトウェア利用支援システムでのインストール検証機能の提案

    村上幸一, 王哲, 舩曵信生

    電子情報通信学会技術研究報告  2013 

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    Event date: 2013.3.29

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A design for OpenFlow implementation of fixed backoff-time switching method in wireless mesh networks

    Sritrusta Sukaridhoto, Nobuo Funabiki, Toru Nakanishi, and Kan Watanabe

    電子情報通信学会2013 年総合大会  2013 

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    Event date: 2013.3.19 - 2013.3.22

    Language:English   Presentation type:Oral presentation (general)  

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  • A proposal of extended anonymous credential scheme with efficient proof on age

    Sadiah Shahidatul, Toru Nakanishi, Kan Watanabe, and Nobuo Funabiki

    電子情報通信学会2013 年総合大会  2013 

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    Event date: 2013.3.19 - 2013.3.22

    Language:English   Presentation type:Oral presentation (general)  

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  • 4種料理での調理手順最適化アルゴリズム適用評価

    松島由紀子, 岡田朋也, 舩曵信生, 中西透, 渡邊寛

    電子情報通信学会2013 年総合大会  2013 

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    Event date: 2013.3.19 - 2013.3.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Webによるレシート情報管理システムの提案

    塔娜, 舩曵信生, 中西透, 渡邊寛

    電子情報通信学会2013 年総合大会  2013 

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    Event date: 2013.3.19 - 2013.3.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • An improved host association optimization stage in access-point aggregation algorithm for wireless local area networks

    Md. Ezharul Islam, Nobuo Funabiki, Toru Nakanishi, and Kan Watanabe

    電子情報通信学会2013 年総合大会  2013 

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    Event date: 2013.3.19 - 2013.3.22

    Language:English   Presentation type:Oral presentation (general)  

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  • 無線メッシュネットワーク動作アクセスポイント選択アルゴリズムの拡張

    藤田翔, 舩曵信生, 中西透, 渡邊寛

    電子情報通信学会技術研究報告  2013 

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    Event date: 2013.1.24 - 2013.1.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 無線メッシュネットワークでのリンク速度変化を考慮した経路木アルゴリズムの拡張

    丸山渉, 舩曵信生, 中西透, 渡邊寛

    電子情報通信学会技術研究報告  2013 

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    Event date: 2013.1.24 - 2013.1.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • An extension of access-point aggregation algorithm considering link speed change for wireless local area networks

    Md. Ezharul Islam, Nobuo Funabiki, Toru Nakanishi, and Kan Watanabe

    電子情報通信学会技術研究報告  2013 

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    Event date: 2013.1.24 - 2013.1.25

    Language:English   Presentation type:Oral presentation (general)  

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  • レシート情報システムのためのデータベース設計と入力データ処理アルゴリズム

    塔娜, 舩曵信生, 中西透, 渡邊寛

    電子情報通信学会技術研究報告  2013 

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    Event date: 2013.1.17 - 2013.1.18

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 手作り料理支援システムの調理ガイダンス機能のためのAndroidアプリケーション

    岡田朋也, 松島由紀子, 舩曵信生, 中西透, 渡邊寛

    電子情報通信学会技術研究報告  2013 

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    Event date: 2013.1.17 - 2013.1.18

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Javaプログラミング学習支援システムの穴埋め問題機能の拡張とその評価

    伊永洋輔, 舩曵信生, 中西透, 渡邊寛, 天野憲樹

    電子情報通信学会技術研究報告  2013 

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    Event date: 2013.1.12

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 否定的な評価を考慮した秘匿性を持つ評価システムの拡張

    野村智也, 中西透, 舩曵信生

    電子情報通信学会技術研究報告  2012 

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    Event date: 2012.12.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:機械振興会館  

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  • CNF式に対する匿名属性認証システムのWeb実装

    濱田雄治, 中西透, 渡邊寛, 舩曵信生

    電子情報通信学会技術研究報告  2012 

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    Event date: 2012.11.21 - 2012.11.22

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:静岡市産学交流センター  

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  • レシート情報入力システムにおける誤認識修正およびカテゴリ分類アルゴリズム

    塔娜, 舩曵信生, 中西透, 渡辺寛

    第14回IEEE広島支部学生シンポジウム(HISS)  2012 

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    Event date: 2012.11.17 - 2012.11.18

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山県立大学  

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  • 忙しい人のための買い物計画アルゴリズムの提案

    岡本早紀, 舩曵信生, 中西透, 渡辺寛

    第14回IEEE広島支部学生シンポジウム(HISS)  2012 

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    Event date: 2012.11.17 - 2012.11.18

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山県立大学  

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  • An extension of wireless Internet-access mesh network simulator for smart antenna use and evaluations using simple topologies

    Shigeto Tajima, Nobuo Funabiki, Teruo Higashino

    電子情報通信学会技術研究報告  2012 

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    Event date: 2012.10.11 - 2012.10.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都大学  

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  • Javaプログラミング学習支援システムでのコード設計学習機能の実装

    中村拓哉, 舩曵信生, 中西透, 渡邊寛, 天野憲樹

    電子情報通信学会技術研究報告  2012 

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    Event date: 2012.9.29

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山口大学  

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  • A Linux implementation design of fixed backoff-time switching method for wireless mesh networks

    Sritrusta Sukaridhoto, Nobuo Funabiki, Toru Nakanishi, Kan Watanabe, Shigeto Tajima

    電子情報通信学会技術研究報告  2012 

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    Event date: 2012.9.20 - 2012.9.21

    Language:English   Presentation type:Oral presentation (general)  

    Venue:東北大学  

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  • 多種料理の調理手順最適化アルゴリズムの拡張

    松島由紀子, 舩曵信生, 中西透, 渡邊寛

    電子情報通信学会技術研究報告  2012 

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    Event date: 2012.8.27 - 2012.8.28

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山口大学  

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  • 無線メッシュネットワークにおけるWDSクラスタ分割アルゴリズムのスマートアンテナ拡張の一般化

    田島滋人, 舩曵信生, 冨里繁, 秦正治, 東野輝夫

    電子情報通信学会技術研究報告  2012 

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    Event date: 2012.4.19 - 2012.4.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:高知県立大学  

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  • Javaプログラミング学習支援システムの穴埋め問題機能の拡張と授業への適用

    伊永洋輔, 舩曵信生, 中西透, 渡邊寛, 天野憲樹

    電子情報通信学会技術研究報告  2012 

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    Event date: 2012.3.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川高専(詫間キャンパス)  

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  • オープンソース・ソフトウェア利用マニュアル管理システムの開発と大学院演習への適用

    村上幸一, 李田財, 舩曵信生, 野上保之

    電子情報通信学会技術研究報告  2012 

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    Event date: 2012.3.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川高専(詫間キャンパス)  

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  • テスト駆動型開発手法を用いたJavaプログラミング学習システムでの誤りコード指示機能の実装

    福山裕輝, 舩曵信生, 中西透, 渡邊寛, 天野憲樹

    電子情報通信学会技術研究報告  2012 

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    Event date: 2012.3.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川高専(詫間キャンパス)  

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  • Webを用いたマークシート方式テスト支援機能の拡張

    高木省吾, 舩曵信生, 中西透, 渡邊寛, 天野憲樹

    電子情報通信学会技術研究報告  2012 

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    Event date: 2012.3.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川高専(詫間キャンパス)  

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  • ボランティアコンピューティングの妨害者対策における抜取検査併用の効果

    渡邊寛, 舩曵信生, 中西透, 福士将

    電子情報通信学会技術研究報告  2012 

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    Event date: 2012.1.26 - 2012.1.27

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:琉球大学工学部  

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  • Rubyを用いたグループ内行事支援システム開発のインターンシップ事例

    岡田朋也, 伊永洋輔, 濱田雄治, 池太大貴, 清水淳基, 竹林辰弥, 舩曵信生, 石原洋之, 佐藤淳行, 大鳥善教, 河本崇幸, 太田真由美

    電子情報通信学会技術研究報告  2012 

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    Event date: 2012.1.21

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山県立大学  

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  • 無線メッシュネットワークでの2個のスマートアンテナ使用アクセスポイントを有するWDSクラスタへの分割アルゴリズム

    田島滋人, 舩曵信生, 冨里繁, 秦正治, 東野輝夫

    電子情報通信学会技術研究報告  2011 

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    Event date: 2011.12.15 - 2011.12.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A proposal of an access-point aggregation algorithm for wireless local area networks

    Md. Ezharul Islam, Nobuo Funabiki, Toru Nakanishi, Kan Watanabe

    電子情報通信学会技術研究報告  2011 

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    Event date: 2011.12.15 - 2011.12.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 匿名属性認証における効率的な範囲証明プロトコルの提案

    池太大貴, 中西透, 舩曵信生

    電子情報通信学会技術研究報告  2011 

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    Event date: 2011.12.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 管理者に対して強固な秘匿性を持つ評価システムの提案

    野村智也, 中西透, 舩曵信生

    電子情報通信学会技術研究報告  2011 

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    Event date: 2011.12.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 2段階調理を考慮した献立作成アルゴリズムのJava実装と機能拡張

    塔娜, 舩曵信生, 中西透, 渡辺寛

    第13回IEEE広島支部学生シンポジウム(HISS)  2011 

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    Event date: 2011.11.12 - 2011.11.13

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Parameter optimization of CSMA-FBS method for wireless mesh network

    Zhe Wang, Nobuo Funabiki, Toru Nakanishi, Kan Watanabe

    第13回IEEE広島支部学生シンポジウム(HISS)  2011 

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    Event date: 2011.11.12 - 2011.11.13

    Language:English   Presentation type:Oral presentation (general)  

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  • ボランティアコンピューティングにおける結託攻撃のモデル化と性能評価

    渡邊寛, 舩曵信生, 中西透, 福士将

    電子情報通信学会技術研究報告  2011 

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    Event date: 2011.10.20

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Web サービスにおける匿名属性認証システムの実装

    濱田雄治, 中西透, 舩曵信生

    コンピュータセキュリティシンポジウム2011  2011 

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    Event date: 2011.10.19 - 2011.10.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Web サービスにおける不正ユーザを排除可能な匿名認証システムの実装

    堀地恭輔, 中西透, 舩曵信生

    コンピュータセキュリティシンポジウム2011  2011 

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    Event date: 2011.10.19 - 2011.10.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 無線メッシュネットワークのスループット最大化のための動作AP選択アルゴリズムの改良

    清水淳基, 舩曵信生, 中西透, 渡邊寛

    電子情報通信学会技術研究報告  2011 

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    Event date: 2011.10.13 - 2011.10.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • テスト駆動型開発手法を用いたJavaプログラミング学習システムでのコード検証方法の改善

    福山裕輝, 舩曵信生, 中西透, 渡邊寛, 天野憲樹

    電子情報通信学会技術研究報告  2011 

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    Event date: 2011.9.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • An implementation and evaluation of fixed backoff-time switching method on QualNet for wireless mesh networks

    Sritrusta Sukaridhoto, Nobuo Funabiki, Toru Nakanishi, Kan Watanabe, Shigeto Tajima

    電子情報通信学会技術研究報告  2011 

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    Event date: 2011.6.23 - 2011.6.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ゲートウエイにMIMOチャネルを用いた無線メッシュネットワークでのWDSクラスタ分割アルゴリズム

    田島滋人, 舩曵信生, 冨里繁, 秦正治, 東野輝夫

    電子情報通信学会技術研究報告  2011 

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    Event date: 2011.4.21 - 2011.4.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Webを用いたマークシート方式テスト支援機能の実装

    河野広貴, 舩曵信生, 中西透, 天野憲樹

    電子情報通信学会技術研究報告  2011 

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    Event date: 2011.3.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • CMSを用いたオープンソースソフトウェア利用マニュアル管理システムの提案 International conference

    李田財, 村上幸一, 舩曵信生

    電子情報通信学会技術研究報告  2011 

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    Event date: 2011.3.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Javaプログラミングの予約語学習のためのオンライン穴埋め問題機能の実装 International conference

    伊永洋輔, 松島由紀子, 舩曵信生, 中西透, 天野憲樹

    電子情報通信学会技術研究報告  2011 

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    Event date: 2011.3.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 忙しい人のためのWebを用いた手作り料理支援システムにおける献立作成・調理手順最適化機能の実装

    岡田朋也, 松島由紀子, 谷口詩歩, 舩曵信生, 中西透, 天野憲樹

    電子情報通信学会技術研究報告  2011 

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    Event date: 2011.3.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • WEBページレイアウト最適化手法を適用したオープンソースソフトウェア異種マニュアルの統合

    堀有輝, 村上幸一, 舩曵信生

    電子情報通信学会技術研究報告  2011 

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    Event date: 2011.3.3 - 2011.3.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • オープンソースソフトウェア・設定マニュアル自動生成システムの試作

    香川恵里奈, 村上幸一, 舩曵信生

    電子情報通信学会技術研究報告  2011 

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    Event date: 2011.3.3 - 2011.3.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 無線メッシュネットワークのスループット最大化のための動作AP選択指標の検討

    清水淳基, 舩曵信生, 中西透

    電子情報通信学会技術研究報告  2010  電子情報通信学会

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    Event date: 2010.12.16 - 2010.12.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山大学  

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  • Webによるオープンソースソフトウェア・設定マニュアルの自動生成法の提案

    香川恵里奈, 村上幸一, 舩曵信生

    電子情報通信学会技術研究報告  2010  電子情報通信学会

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    Event date: 2010.12.16 - 2010.12.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山大学  

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  • An implementation of a pairing-based anonymous credential system with constant complexity

    Amang Sudarono, Toru Nakanishi, and Nobuo Funabiki

    電子情報通信学会技術研究報告  2010  電子情報通信学会

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    Event date: 2010.12.16 - 2010.12.17

    Language:English   Presentation type:Oral presentation (general)  

    Venue:岡山大学  

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  • ノード配置問題に対するアント最適化法

    大倉慶一, 片山謙吾, 舩曵信生, 南原英生, 西原典孝

    電子情報通信学会技術研究報告  2010  電子情報通信学会

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    Event date: 2010.12.16 - 2010.12.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山大学  

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  • 無線メッシュネットワークにおけるリンク動作率による固定待機時間切り替え方式の提案

    田島滋人, 舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告  2010  電子情報通信学会

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    Event date: 2010.12.16 - 2010.12.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山大学  

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  • Webページレイアウト最適化法のオープンソースソフトウェア・インストールマニュアルへの適用

    堀有輝, 村上幸一, 舩曵信生, 清水淳基

    電子情報通信学会技術研究報告  2010  電子情報通信学会

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    Event date: 2010.12.16 - 2010.12.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山大学  

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  • A proposal of a traffic control method with bandwidth usage estimation for real-time applications in wireless mesh networks

    Sritrusta Sukaridhoto, Nobuo Funabiki, and Toru Nakanishi

    電子情報通信学会技術研究報告  2010  電子情報通信学会

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    Event date: 2010.12.16 - 2010.12.17

    Language:English   Presentation type:Oral presentation (general)  

    Venue:岡山大学  

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  • 忙しい人のためのまとめ調理を考慮した料理献立と食材購入タイミング選択アルゴリズム

    谷口詩歩, 舩曵信生, 中西透

    電子情報通信学会技術研究報告  2010  電子情報通信学会

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    Event date: 2010.11.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学  

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  • 調理手順最適化のための調理モデルの拡張と副調理者の役割変更の効果

    松島由紀子, 舩曵信生, 中西透

    電子情報通信学会技術研究報告  2010  電子情報通信学会

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    Event date: 2010.11.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学  

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  • 忙しい人の手作り料理支援のためのまとめ買い食材選択アルゴリズム

    谷口詩歩, 舩曵信生, 中西透

    第12回IEEE広島支部学生シンポジウム(HISS)  2010  IEEE広島支部

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    Event date: 2010.11.6 - 2010.11.7

    Language:Japanese   Presentation type:Poster presentation  

    Venue:島根大学  

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  • メンバ間・グループ間双方の公平性を重視したグループ分けアルゴリズム

    伊永洋輔, 舩曵信生, 中西透

    第12回IEEE広島支部学生シンポジウム(HISS)  2010  IEEE広島支部

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    Event date: 2010.11.6 - 2010.11.7

    Language:Japanese   Presentation type:Poster presentation  

    Venue:島根大学  

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  • スケーラブル無線メッシュネットワークの通信性能を極大とする最小スマートアクセスポイント配置

    竹林辰弥, 舩曵信生, 中西透

    電子情報通信学会技術研究報告  2010  電子情報通信学会

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    Event date: 2010.10.21 - 2010.10.22

    Presentation type:Oral presentation (general)  

    Venue:大阪大学中之島センター  

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  • プロキシを用いた匿名認証システムのユーザ登録機能及び追跡機能の実装

    矢野真也, 中西透, 舩曵信生

    コンピュータセキュリティシンポジウム(CSS2010)  2010 

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    Event date: 2010.10.19 - 2010.10.21

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山コンベンションセンター  

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  • Efficient proofs of attributes in anonymous credential systems using a pairing-based accumulator

    Amang Sudarsono, Toru Nakanishi, and Nobuo Funabiki

    コンピュータセキュリティシンポジウム(CSS2010)  2010 

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    Event date: 2010.10.19 - 2010.10.21

    Language:English   Presentation type:Oral presentation (general)  

    Venue:岡山コンベンションセンター  

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  • アキュムレータを用いた失効可能グループ署名方式の公開鍵サイズの低減

    池太大貴, 中西透, 舩曵信生

    コンピュータセキュリティシンポジウム(CSS2010)  2010 

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    Event date: 2010.10.19 - 2010.10.21

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山コンベンションセンター  

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  • 組織間連携を考慮した匿名IEEE802.1X認証プロトコルの実装

    佐藤優光, アマンスダルソノ, 中西透, 舩曵信生

    コンピュータセキュリティシンポジウム(CSS2010)  2010 

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    Event date: 2010.10.19 - 2010.10.21

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山コンベンションセンター  

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  • WDMリングネットワークのノード構成問題の展開

    磯貝愛, 舩曵信生, 中西透

    情報処理学会研究報告  2010  情報処理学会

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    Event date: 2010.9.17 - 2010.9.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:飛騨・世界生活文化センター  

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  • 多種料理の調理手順スケジューリングアルゴリズムの複数調理者への拡張

    松島由紀子, 舩曵信生, 中西透

    電子情報通信学会技術研究報告  2010  電子情報通信学会

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    Event date: 2010.8.23

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:国立情報学研究所  

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  • 無線メッシュネットワークのアクセスポイント間通信での優先度順リンク動作方式

    田島滋人, 舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告  2010  電子情報通信学会

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    Event date: 2010.4.15 - 2010.4.16

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鹿児島大学  

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  • テスト駆動型開発手法のJavaプログラミング教育応用におけるテストコード提出機能

    福山裕輝, 舩曵信生, 中西透, 天野憲樹

    情報処理学会研究報告  2010  情報処理学会

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    Event date: 2010.3.6 - 2010.3.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:筑波大学(東京)  

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  • インターネットアクセス無線メッシュネットワークでの動作アクセスポイント選択アルゴリズムの提案

    清水淳基, 舩曵信生, 中西透

    電子情報通信学会インターネットアーキテクチャ研究会  2010 

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    Event date: 2010.2.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:機械振興会館  

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  • 多種料理の調理順最適化アルゴリズムの提案

    松島由紀子, 舩曵信生, 中西透

    情報処理学会研究報告  2009 

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    Event date: 2009.12.17 - 2009.12.18

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Improvement of dependable access point allocation algorithm and introduction of route availability for wireless mesh networks

    Walaa Hassan, Tamer Farag, Nobuo Funabiki, Toru Nakanishi

    IEICE Technical Report  2009 

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    Event date: 2009.12.10 - 2009.12.11

    Language:English   Presentation type:Oral presentation (general)  

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  • 忙しい人のための多種料理の調理順最適化アルゴリズム

    松島由紀子, 舩曵信生, 中西透

    第11回IEEE広島支部学生シンポジウム(HISS)  2009  IEEE広島支部

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    Event date: 2009.11.21 - 2009.11.22

    Language:Japanese   Presentation type:Poster presentation  

    Venue:山口大学  

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  • テスト駆動開発手法によるJavaプログラミング教育支援システムの実用性向上

    福山裕輝, 松島由紀子, 舩曵信生, 中西透

    第11回IEEE広島支部学生シンポジウム(HISS)  2009  IEEE広島支部

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    Event date: 2009.11.21 - 2009.11.22

    Language:Japanese   Presentation type:Poster presentation  

    Venue:山口大学  

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  • Webページレイアウト最適化法の通常フロー配置への拡張

    清水淳基, 磯貝愛, 舩曵信生, 中西透

    第11回IEEE広島支部学生シンポジウム(HISS)  2009  IEEE広島支部

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    Event date: 2009.11.21 - 2009.11.22

    Language:Japanese   Presentation type:Poster presentation  

    Venue:山口大学  

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  • 藤井裕城, 中西透, 舩曵信生

    藤井裕城, 中西透, 舩曵信生

    電子情報通信学会技術研究報告  2009 

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    Event date: 2009.11.12

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • スケーラブル無線メッシュネットワークのためのスマートアクセスポイント配置アルゴリズムの提案

    上村香菜子, 舩曵信生, 中西透

    電子情報通信学会技術研究報告  2009 

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    Event date: 2009.10.15 - 2009.10.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • プロキシを用いた匿名認証システムの改良と匿名掲示板への応用

    矢野真也, 中西透, 舩曵信生

    電子情報通信学会技術研究報告  2009 

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    Event date: 2009.9.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 閲覧サイズに適応するWebページレイアウト最適化法でのアクセス性改善

    磯貝愛, 舩曵信生, 中西透

    電子情報通信学会技術研究報告  2009 

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    Event date: 2009.7.30 - 2009.7.31

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • An implementation of a group signature scheme with efficient verifier-local revocation check

    Amang Sudarsono, Toru Nakanishi, Yumi Sakemi, Yasuyuki Nogami, Nobuo Funabiki

    IEICE Technical Report  2009 

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    Event date: 2009.5.22

    Language:English   Presentation type:Oral presentation (general)  

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  • A generalized access point allocation algorithm for wireless mesh networks in indoor environments

    Tamer Farag, Nobuo Funabiki, Toru Nakanishi

    IEICE Technical Report  2009 

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    Event date: 2009.5.21 - 2009.5.22

    Language:English   Presentation type:Oral presentation (general)  

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  • Dependability extensions of the access point allocation algorithm for wireless mesh networks

    Walaa Hassan, Tamer Farag, Nobuo Funabiki, Toru Nakanishi

    IEICE Technical Report  2009 

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    Event date: 2009.5.21 - 2009.5.22

    Language:English   Presentation type:Oral presentation (general)  

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  • オープンソースソフトウエアインストールマニュアル管理のためのWebデータベースシステム

    村上幸一, 韓悦, 舩曵信生, 中西透, 徳永秀和, 重田和弘

    電子情報通信学会技術研究報告  2009 

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    Event date: 2009.3.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 教育支援システム"NOBASU"での文章作法オンラインチェック機能

    河野広貴, 舩曵信生, 中西透, 天野憲樹

    電子情報通信学会技術研究報告  2009 

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    Event date: 2009.3.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 無線メッシュネットワークにおけるWDSクラスタ分割アルゴリズムの改善

    田島滋人, 舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告  2009 

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    Event date: 2009.3.3 - 2009.3.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • シーン対応分割によるマルチサーバビデオエンコードシステム

    岡田源也, 舩曵信生, 中西透

    電子情報通信学会技術研究報告  2009 

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    Event date: 2009.1.22 - 2009.1.23

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • テスト駆動型開発手法によるJavaプログラミング教育支援システムの提案

    松島由紀子, 笠井康裕, 舩曵信生, 中西透, 天野憲樹

    電子情報通信学会技術研究報告  2009 

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    Event date: 2009.1.22 - 2009.1.23

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 多様な閲覧サイズのためのWebページレイアウト最適化法の提案

    一色陽介, 舩曵信生, 中西透, 磯貝愛

    電子情報通信学会技術研究報告  2009 

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    Event date: 2009.1.22 - 2009.1.23

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • オープンソース利用初心者を対象としたインストール操作支援システムの提案

    村上幸一, 舩曵信生, 徳永秀和, 重田和弘, 中西透

    第10回IEEE広島支部学生シンポジウム(HISS)  2008  IEEE広島支部

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    Event date: 2008.11.22 - 2008.11.23

    Language:Japanese   Presentation type:Poster presentation  

    Venue:広島市立大学  

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  • WDMリングネットワークのノード構成アルゴリズムのマルチリングへの拡張

    河野広貴, 一色陽介, 磯貝愛, 舩曵信生, 中西透

    第10回IEEE広島支部学生シンポジウム(HISS)  2008  IEEE広島支部

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    Event date: 2008.11.22 - 2008.11.23

    Language:Japanese   Presentation type:Poster presentation  

    Venue:広島市立大学  

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  • 無線メッシュネットワークの実用性向上を目的としたスマートアクセスポイントの構築

    平方健吾, 堀内哲史, *舩曵信生, 中西透

    電子情報通信学会技術研究報告  2008 

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    Event date: 2008.11.13 - 2008.11.14

    Presentation type:Oral presentation (general)  

    Venue:郡山  

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  • ペアリングを用いた効率的なForward-Secureグループ署名方式の公開鍵サイズの低減

    平雄太, 中西透, *舩曵信生

    電子情報通信学会技術研究報告  2008 

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    Event date: 2008.11.13 - 2008.11.14

    Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • 仮想マシンモニタ"Xen"を用いたスケーラブルなWebサーバシステムの提案

    小路朋也, 井上勇樹, *舩曵信生, 中西透, 籠谷裕人

    電子情報通信学会技術研究報告  2008 

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    Event date: 2008.11.13 - 2008.11.14

    Presentation type:Oral presentation (general)  

    Venue:郡山  

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  • 教養科目履修の最適割当アルゴリズムの提案

    小路朋也, 藤井裕城, 上村香菜子, 河野広貴, *舩曵信生, 中西透

    電子情報通信学会技術研究報告  2008 

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    Event date: 2008.10.17

    Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • Webサービスにおけるプロキシを用いた匿名認証システムの実装

    大林弘樹, 中西透, 舩曵信生

    コンピュータセキュリティシンポジウム2008(CSS2008)  2008 

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    Event date: 2008.10.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:沖縄コンベンションセンター  

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  • 署名生成・検証時間が一定であるメンバ失効可能グループ署名方式の公開鍵サイズの低減

    藤井裕城, 平雄太, 中西透, *舩曵信生

    電子情報通信学会技術研究報告  2008 

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    Event date: 2008.9.12

    Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 教育支援システムNOBASUの支援機能の拡張

    笠井康裕, *舩曵信生, 天野憲樹, 中西透

    電子情報通信学会技術研究報告  2008 

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    Event date: 2008.6.14

    Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • Webによる学習管理システム向け4階層アーキテクチャの提案とNOBASUへの実装

    馬場章太, 天野憲樹, *舩曵信生, 中西透

    情報処理学会グループウェアとネットワークサービス研究会  2008 

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    Event date: 2008.3.21

    Presentation type:Oral presentation (general)  

    Venue:八王子市  

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  • 複数オープンソース間連携を要するインストールマニュアルの自動生成法

    村上幸一, *舩曵信生, 徳永秀和, 重田和弘

    情報処理学会グループウェアとネットワークサービス研究会  2008 

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    Event date: 2008.3.21

    Presentation type:Oral presentation (general)  

    Venue:八王子  

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  • 二階層無線メッシュネットワークへの経路木アルゴリズムの拡張

    上村香菜子, *舩曵信生, 中西透, ターメルファラグ

    電子情報通信学会ネットワークシステム研究会  2008 

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    Event date: 2008.3.6 - 2008.3.7

    Presentation type:Oral presentation (general)  

    Venue:名護  

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  • 構造化学習のための講義シーンの分類・関連付け手法の提案

    毛利亜紀, *舩曵信生, 中西透

    情報処理学会コンピュータと教育研究会  2008 

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    Event date: 2008.2.16 - 2008.2.17

    Presentation type:Oral presentation (general)  

    Venue:小金井市  

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  • 無線メッシュネットワークでのコンテンションウインドウサイズ操作時のスループット測定結果

    加藤秀明, *舩曵信生, 中西透

    電子情報通信学会技術研究報告  2007 

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    Event date: 2007.12.20 - 2007.12.21

    Presentation type:Oral presentation (general)  

    Venue:千葉  

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  • プライバシ保護を目的としたグループ署名に基づくSSL/TLSプロトコルの実装

    大林弘樹,中西透,川島潤,*舩曵信生

    電子情報通信学会技術研究報告  2007 

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    Event date: 2007.12.19

    Presentation type:Oral presentation (general)  

    Venue:東京  

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  • モバイルホストの負荷を軽減した失効機能をもつ匿名IEEE802.1X認証の実装

    三木康平,中西透,川島潤,*舩曵信生

    情報処理学会研究報告  2007 

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    Event date: 2007.12.14

    Presentation type:Oral presentation (general)  

    Venue:東京  

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  • A heuristic algorithm for access point allocation in indoor environments for wireless mesh networks

    Tamer Farag, Nobuo Funabiki, and Toru Nakanishi

    IEICE Technical Report  2007 

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    Event date: 2007.12.13 - 2007.12.14

    Presentation type:Oral presentation (general)  

    Venue:広島  

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  • uClinux環境下でのOSレベル仮想化の実現

    川島潤, 中西透, *舩曵信生

    情報処理学会研究報告  2007 

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    Event date: 2007.12.4

    Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • 不正回答を防止できる授業評価アンケートシステムの実装

    谷川浩司,中西透,*舩曵信生

    コンピュータセキュリティシンポジウム  2007 

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    Event date: 2007.10.31 - 2007.11.2

    Presentation type:Oral presentation (general)  

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  • 無線メッシュネットワークでの最大遅延の最小化を目的とした経路木生成アルゴリズムの提案

    上村香菜子, *舩曵信生, 中西透, ターメルファラグ

    電子情報通信学会技術研究報告  2007 

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    Event date: 2007.10.18 - 2007.10.19

    Presentation type:Oral presentation (general)  

    Venue:東京  

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  • WDMリングネットワークのノード構成アルゴリズムの改良

    一色陽介, 磯貝愛, *舩曵信生, 中西透

    電子情報通信学会技術研究報告  2007 

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    Event date: 2007.10.11 - 2007.10.12

    Presentation type:Oral presentation (general)  

    Venue:小金井市  

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  • 署名者の負担を軽減した失効方式をもつペアリングを用いたグループ署名方式の実装

    平雄太, 加藤英洋, 中西透, 野上保之, *舩曵信生, 森川良孝

    電子情報通信学会技術研究報告, ISEC2007-83  2007 

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    Event date: 2007.9.7

    Venue:東京都  

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  • ログファイルを用いたオープンソースソフトウエアのインストールマニュアル自動生成法の提案

    村上幸一, *舩曵信生, 徳永秀和, 重田和弘

    電子情報通信学会技術研究報告, ET2007-33  2007 

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    Event date: 2007.9.1

    Venue:寝屋川市  

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  • WEBベースの教育支援システム"NOBASU"の拡張と評価

    岡田源也, *舩曵信生, 中西透, 天野憲樹

    電子情報通信学会技術研究報告, ET2007-38  2007 

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    Event date: 2007.9.1

    Venue:寝屋川市  

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  • デジタル紙芝居システムによる講義シーン再生システムの提案

    毛利亜紀, 一色陽介, *舩曵信生, 中西透

    電子情報通信学会技術研究報告, ET2007-16  2007 

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    Event date: 2007.7.21

    Venue:盛岡市  

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  • リモートI/O機器のための組込みLinux

    小路朋也, 川島潤, *舩曵信生, 中西透, 飯島英樹, 前田康之

    電子情報通信学会技術研究報告, NS2007-28  2007 

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    Event date: 2007.5.18 - 2007.5.19

    Venue:吹田市  

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  • PeerCastにおける経路の動的変更機能の実装

    安原健介, 甲本卓也, *舩曵信生, 杉山裕二

    電子情報通信学会技術研究報告, NS2007-19  2007 

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    Event date: 2007.5.17 - 2007.5.18

    Venue:吹田市  

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  • 無線メッシュネットワークのWDSクラスタ分割問題

    田島滋人,*舩曵信生, 東野輝夫

    電子情報通信学会技術研究報告, NS2006-220  2007 

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    Event date: 2007.3.8 - 2007.3.10

    Venue:宜野湾市  

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  • デジタル紙芝居配信システムに関する研究

    篠原陽介, 毛利亜紀, *舩曵信生, 甲本卓也

    電気・情報関連学会中国支部第57回連合大会  2006 

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    Event date: 2006.10.21

    Venue:岡山  

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  • WEBによる教育活動支援システムNOBASUの開発と運用

    *舩曵信生, 長尾憲暁, 永田佳範, 馬場章太

    平成18年度工業・工学教育研究講演会  2006 

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    Event date: 2006.7.28 - 2006.7.30

    Venue:北九州  

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  • アプリケーションレベルマルチキャスト通信経路木の視覚的評価のためのMINET_Viewerの開発

    吉田翔志, *舩曵信生, 中西透

    第7回IEEE広島支部学生シンポジウム(HISS)  2005 

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    Event date: 2005.11.27

    Venue:岡山市  

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  • 最適化手法によるパノラマ画像合成法の提案

    磯貝愛, *舩曵信生, 甲本卓也, 杉山裕二, 尾崎亮, 岡本卓爾

    電子情報通信学会SIS  2004 

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    Event date: 2004.12.16 - 2004.12.17

    Venue:豊中  

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  • IC/LSI電源系EMCマクロモデルLECCSのためのパラメータ最適化アルゴリズムの提案

    野村洋平, 川島潤, *舩曵信生, 豊田友博, 南澤裕一郎, 和田修己

    電子情報通信学会EMCJ  2004 

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    Event date: 2004.12.9 - 2004.12.10

    Venue:名古屋  

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  • A minimum dead space algorithm for wavelength reuse problems in WDM ring networks

    *Nobuo Funabiki, Toru Nakanishi, Yoshitaka Toyota, Jun Kawashima, and Teruo Higashino

    International Conference on Optical Communications and Networks (ICOCN-2004)  2004 

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    Event date: 2004.11.30 - 2004.12.1

    Venue:Hong Kong  

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  • A proposal of hierarchical chordal ring network topology for WDM networks

    Tomoya Kitani, *Nobuo Funabiki, and Teruo Higashino

    2004 International Conference on Networks (ICON-2004)  2004 

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    Event date: 2004.11.16 - 2004.11.19

    Venue:Singapore  

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  • 大規模グループにおいて所属無効化が可能なグループ署名方式

    窪岡史章, 中西透, *舩曵信生

    電子情報通信学会ISEC  2004 

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    Event date: 2004.11.8 - 2004.11.9

    Venue:吹田  

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  • 講義・演習を対象としたWEBベースの教育支援システムの検討

    高橋紀行,*舩曵信生,中西透

    電子情報通信学会ET  2004 

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    Event date: 2004.10.16

    Venue:倉敷  

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  • 集計時の負荷を軽減した重み付き電子投票プロトコル

    中武真治, 中西透, *舩曵信生, 杉山裕二

    電子情報通信学会ISEC  2004 

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    Event date: 2004.7.20 - 2004.7.21

    Venue:徳島  

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  • アドホックネットワークへの中継アンテナ導入によるホスト間通信経路の確保

    三谷千恵, 熊野英嗣, *舩曵信生, 中西透

    電子情報通信学会NS  2004 

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    Event date: 2004.7.15 - 2004.7.16

    Venue:広島  

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  • WEBを用いた英語教員の授業割当支援システム

    高橋紀行,*舩曵信生,矢野正昭

    電子情報通信学会ET  2004 

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    Event date: 2004.3.5

    Venue:高松  

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  • マルチホームネットワーク環境下での完全k分木型ピアツーピアマルチキャスト経路木探索解法の提案

    川島潤,*舩曵信生,岡山聖彦

    電子情報通信学会NS  2004 

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    Event date: 2004.1.29 - 2004.1.30

    Venue:堺  

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  • 可変テンプレートマッチング法による歯の輪郭線抽出法の提案

    丹生谷佳紀,*舩曵信生,岸本悦央

    電子情報通信学会PRMU  2004 

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    Event date: 2004.1.22 - 2004.1.23

    Venue:大阪  

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  • アドホックネットワークのための信頼度制約ルーティング問題とそのアルゴリズムの提案

    熊野英嗣, 三谷千恵,*舩曵信生

    IEEE広島支部学生シンポジウム(HISS)  2003 

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    Event date: 2003.12.13 - 2003.12.14

    Venue:広島市  

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  • Deformable Template Matching法による歯の輪郭線抽出法の提案

    丹生谷吉紀, *舩曵信生, 岸本悦央

    電気・情報関連学会中国支部第54回連合大会  2003 

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    Event date: 2003.10.18

    Venue:広島市  

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  • グループ内での暗号ファイルの相互利用を可能とするファイル保護システムの提案

    高橋紀行, *舩曵信生, 小林正憲

    電気・情報関連学会中国支部第54回連合大会  2003 

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    Event date: 2003.10.18

    Venue:広島市  

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  • 静的マルチキャストルーティング問題に対する最適パス選択解法の提案

    藤井雅和, *船曵信生,中田明夫,北道淳司,東野輝夫

    電子情報通信学会コンピュテーション研究会  2001 

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    Event date: 2001.1.30

    Venue:東京  

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  • A greedy-neural combined discrete optimization algorithm for triangle and Kn-subgraph partition problem

    Hirotaka Ohtsuka, *Nobuo Funabiki, Teruo Higashino

    World Multiconference on Systemics, Cybernetics, and Informatics  2000 

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    Event date: 2000.7.23 - 2000.7.27

    Venue:Orlando  

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  • A proposal of a neuron filter algorithm with a thinning-out method for total coloring problems

    Yoichi Takenaka, *Nobuo Funabiki

    World Multiconference on Systemics, Cybernetics, and Informatics  2000 

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    Event date: 2000.7.23 - 2000.7.27

    Venue:Orlando  

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  • A greedy digital neural-network algorithm for subgraph isomorphism problems

    *Nobuo Funabiki,Teruo Higashino

    World Multiconference on Systemics, Cybernetics, and Informatics  2000 

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    Event date: 2000.7.23 - 2000.7.27

    Venue:Orlando  

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  • 静的マルチキャストルーティング問題に対する2段階解法の提案

    藤井雅和, *船曵信生, 東野輝夫

    第13回回路とシステム(軽井沢)ワークショップ  2000 

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    Event date: 2000.4.24 - 2000.4.26

    Venue:軽井沢  

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  • A proposal of a two-stage discrete optimization method for the maximum clique problem

    *Nobuo Funabiki, Teruo Higashino

    International Symposium on Nonlinear Theory and Its Applications  1999 

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    Event date: 1999.11.27 - 1999.12.2

    Venue:Hawaii Island  

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  • A non-feedback neuron filter algorithm for separated board-level routing problems in FPGA-based logic emulation systems

    Yoichi Takenaka, *Nobuo Funabiki

    IEEE International Joint Conference on Neural Networks  1999 

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    Event date: 1999.7.11 - 1999.7.15

    Venue:Washington D.C.  

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  • A gradual neural network approach for broadcast scheduling in packet radio networks

    *Nobuo Funabiki, Yoichi Takenaka, Teruo Higashino

    IEEE International Joint Conference on Neural Networks  1999 

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    Event date: 1999.7.11 - 1999.7.15

    Venue:Washington D.C.  

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  • Application of throughput drop estimation model to frequency channel and channel bonding assignment in IEEE 802.11n WLAN

    Kwenga Ismael Munene, Nobuo Funabiki, Hendy Briantoro, Md. Mahbubur Rahman, Sujan Chandra Roy, Minoru Kuribayashi

    IEICE Society Conference, BS-6-11  2021.9.14 

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  • A study of throughput drop estimation model for two-link concurrent communications in 5GHz IEEE 802.11ac WLAN

    Sujan Chandra Roy, Nobuo Funabiki, Kwenga Ismael Munene, Hendy Briantoro, Md. Mahbubur Rahman, Fatema Akhter, Minoru Kuribayashi

    IEICE Society Conference, BS-6-1  2021.9.14 

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  • A study of value trace problems in JavaScript programming learning assistant system

    Khin Thet Mon, Nobuo Funabiki, Htoo Htoo, Sandi Kyaw, May Paing, Paing Zaw, Ei Ei Myat

    ISPJ/IEICE Forum on Information Technology (FIT), CB-002  2021.8.25 

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  • Applications of element fill-in-blank problems for C programming learning in three universities

    Htoo Htoo, Sandi Kyaw, Nobuo Funabiki, Thandar Myint, Phyu Phyu Tar, Nandar Win Min, Hnin Aye Thant, Shune Lae Aung, Nem Khan Dim

    ISPJ/IEICE Forum on Information Technology (FIT), CB-003  2021.8.25 

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  • A study of fingerprint parameter optimization method for indoor localization system using IEEE802.15.4 devices

    Yuanzhi Huo, Pradini Puspitaningayu, Kazushi Hamazaki, Nobuo Funabiki, Minoru Kuribayashi, Kazuyuki Kojima

    電子情報通信学会技術研究報告  2021.5.10 

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  • 空調環境適正化ガイダンスシステムでの換気指示機能の実装

    坂上暢規, 霍元智, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告, LOIS2021-1  2021.5.10 

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  • プログラミング学習支援システムの解答分析機能の拡張

    西村一輝, 岩本晃司郎, Htoo Htoo, Sandy Kyaw, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告, LOIS2021-2  2021.5.10 

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  • IEEE802.15.4プロトコルを用いた屋内位置検知システムの複数ユーザ対応のための拡張

    濵﨑和志, Pradini Puspitaningayu, 舩曵信生, 栗林稔

    電子情報通信学会技術研究報告, LOIS2021-3  2021.5.10 

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  • An improvement of transmission power optimization method considering channel assignment for concurrently communicating three access-points in wireless local-area network

    Hendy Briantoro, Nobuo Funabiki, Md. Mahbubur Rahman, Kwenga Ismael Munene, Sujan Chandra Roy, Minoru Kuribayashi

    IEICE General Conference  2021.3.9 

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  • A study of product identification system using optical character recognition

    Shixi Chen, Nobuo Funabiki, Masaki Sakagami, Takashi Toshida, Kohei Suga

    電子情報通信学会技術研究報告, LOIS2020-48  2021.3.4 

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  • Implementation and performance evaluation of unit testing in Android programming learning assistance system

    Yan Watequlis Syaifudin, Nobuo Funabiki, Minoru Kuribayashi

    電子情報通信学会技術研究報告, LOIS2020-32  2021.1.21 

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  • A study of code completion problem for C programming learning assistant system

    Htoo Htoo, Sandi Kyaw, Nobuo Funabiki, Minoru Kuribayashi, Thandar Myint, Hnin Aye Thant

    電子情報通信学会技術研究報告, LOIS2020-34  2021.1.21 

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  • An implementation of fingerprint-based indoor positioning system using IEEE 802.15.4

    Pradini Puspitaningayu, Kazushi Hamazaki, Nobuo Funabiki, Hein Htet, Minoru Kuribayashi

    電子情報通信学会技術研究報告, LOIS2020-28  2021.1.21 

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  • An implementation of hint Function for element fill-in-blank problems at offline answering function in Java programming learning assistant system

    Su Sandy Wint, Nobuo Funabiki, Minoru Kuribayashi

    電子情報通信学会技術研究報告, LOIS2020-33  2021.1.21 

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  • Throughput measurements with various indoor AP placement conditions for IEEE802.11n wireless networks

    IEICE General Conference  2016 

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  • Performance evaluations of elastic WLAN testbed

    IEICE General Conference  2016 

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  • Evaluations of access-point configuration algorithm under limited mobile router allocations

    IEICE General Conference  2016 

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Works

  • 岡山大学・知恵の見本市

    2015

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Awards

  • Best Presenter Award

    2023.10   2023 The Fifth International Conference on Vocational Educational and Electrical Engineering (ICVEE 2023)   An investigation of running load comparisons of ARCore on native Android and Unity for outdoor navigation system using smartphone

    Komang Candra Brata, Nobuo Funabiki, Evianita Dewi Fajrianti, Mustika Mentari, Sritrusta Sukaridhoto

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  • Excellent Student Paper Award

    2023.10   2023 IEEE 12th Global Conference on Consumer Electronics (GCCE 2023)   A proposal of auxiliary line generation algorithm for portrait drawing learning assistant system using OpenPose and OpenCV

    Zitong Kong, Yue Zhang, Nobuo Funabiki, Yuanzhi Huo, Minoru Kuribayashi, Dwinanda Puspitasari Harahap

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  • Best Presentation Award

    2023.3   2023 11th International Conference on Information and Education Technology (ICIET 2023)   An implementation of Java programming learning assistant system in university course

    Xiqin Lu, Nobuo Funabiki, Soe Thandar Aung, Yanhui Jing, Shingo Yamaguchi

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  • Bronze Best Paper Award

    2021.10   2021 IEEE 10th Global Conference on Consumer Electronics (GCCE)   Test code improvements for code writing problem in Java programming assistant system

    Xiqin Lu, Huiyu Qi, Nobuo Funabiki, Soe Thandar Aung, Ei Ei Htet, Khin Sandar Lin, and Wen-Chung Kao

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  • Best Paper Award

    2021.10   2021 4th International Conference on Vocational Education and Electrical Engineering (ICVEE)   Investigations of detection accuracy improvements for fingerprint-based indoor localization system using IEEE 802.15.4

    Pradini Puspitaningayu, Yuanzhi Huo, Nobuo Funabiki, Kazushi Hamazaki, Minoru Kuribayashi, and Wen-Chung Kao

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  • Excellent Paper Award of Oral Presentation

    2021.3   2021 IEEE 3rd Global Conference on Life Sciences and Technologies (LifeTech 2021)   Performance investigation of unit testing in Android programming learning assistance system

    Yan Watequlis Syaifudin, Nobuo Funabiki, Devany C. Wijaya, and Ikhlaashul Mu'aasyiqiin

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  • Best Presentation Award

    2021.3   2021 9th International Conference on Information and Education Technology (ICIET 2021)   A code completion problem in C programming learning assistant system

    Htoo Htoo Sandi Kyaw, Ei Ei Htet, Nobuo Funabiki, Minoru Kuribayashi, Thandar Myint, Phyu Phyu Tar, Nandar Win Min, Hnin Aye Thant, and Phyu Hnin Wai

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  • Best Paper Award

    2018.11   The 2nd International Conference on Advanced Information Technologies (ICAIT2018)   Applications of minimax access-point setup optimization approach to IEEE802.11ac WLAN at 5GHz

    Kyaw Soe Lwin, Zinan Wang, Nobuo Funabiki, MinoruKuribayashi, and Wen-Chung Kao

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  • Best Paper Award of International Conference on Education and Information Technology 2016 (ICEIT2016)

    2016  

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  • Certificate of Merit for The 2015 IAENG International Conference on Software Engineering

    2015  

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  • Best Paper Award of 4th International Congress on Advanced Applied Informatics (AAI 2015)

    2015  

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    Country:Japan

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  • Competitive Paper Award of The 3rd International Conference on Applied and Theoretical Information Systems Research (ATISR2013)

    2013  

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  • Best Paper Award of International Conference on Education and Information Technology 2012 (WICEIT 2012)

    2012  

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  • Best Paper Award of The 14th International Conference on Network-Based Information Systems (NBiS 2011)

    2011  

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  • Best Paper Award of The 2011 IAENG International Conference on Communication Systems and Applications (ICCSA 2011)

    2011  

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  • DICOMO2004優秀論文賞

    2004  

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    Country:Japan

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Research Projects

  • A study of system formation method for elastic wireless local-area network

    Grant number:16K00127  2016.04 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Funabiki Nobuo

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    Grant amount:\4680000 ( Direct expense: \3600000 、 Indirect expense:\1080000 )

    In this research, we have studied the system formation method for the elastic wireless local-area network (E-WLAN) that dynamically changes the configurations of the access-points (APs) depending on traffic demands and network environments. Through research activities, we have achieved the following results: 1) to propose the physical setup method of the AP device in the network field, 2) to formulate the throughput estimation model of the wireless link, 3) to define the throughput drop estimation model under interference from other links for partially overlapping channels, 4) to proposed optimization algorithms on channel assignments, transmission power assignments, and channel bonding assignments for dynamic configurations of the APs, 5) to investigate the distributed data cash system, and 6) to implement the testbed system for E-WLAN using Raspberry Pi for APs.

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  • Astudy of peerto-peer multicast communications with multiple Internet interfaces

    Grant number:16500034  2004 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    FUNABIKI Nobuo, OKAYAMA Kiyohiko, NAKANISHI Toru, HIGASHINO Teruo, OZAKI Toru

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    Grant amount:\3970000 ( Direct expense: \3700000 、 Indirect expense:\270000 )

    In this year, we have realized the dynamic routing change function for PeerCast, which is adopted as the middleware for peer-to-peer communications in this study, in order to optimize the routing while continuing communications, because PeerCast usually cannot produce the optimal routing. Then, we have studied the multimedia distribution system using the Web technology by the form of the digital picture-card show that plays back each scene of a distance lecture and a video meeting with the combination of a high-resolution digital still image and a speaker's voice for one scene, due to the various problems of security holes, high communication loads, and degrades of usability in using designated software's for peer-to-peer multimedia communications. In this year, we have implemented this system, and evaluated it through its applications to several lectures in our department, where the effectiveness is confirmed by the contribution to the improvement of understandings of students. In addition, we have realized the multimedia distribution system with high response in the wireless mesh network by incorporating Web cashes into mesh routers. The wireless mesh network has been studied as a platform to provide the ubiquitous environment of this multimedia system by allocating multiple wireless routers in the field. We have proposed the two-layer mesh network architecture composed of expensive high-performance routers and inexpensive low-performance routers to achieve the flexibility, the expandability, and the accessibility, where trusted hosts with multiple network interfaces may become the former routers. For this purpose, we have implemented the host authentication function, the multiple channel function, and the IP address assignment function.

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  • Possibility of proteomic analyzation of saliva from patients with dry mouth

    Grant number:16592087  2004 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    KISHIMOTO Etsuo, TAKAGI Shin, FUNABIKI Nobuo, NAKANISHI Toru

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    Grant amount:\3300000 ( Direct expense: \3300000 )

    The aim of this study was to describe the relationship between subjective feeling of dry mouth and medication intake, saliva flow, saliva composition in eldery people. Also the patient taking many medicine tend to suffer from dry mouth, then mechanisms and drugs of dry mouth induced with medicine were examined on the data base, Drugs in Japan. There were significant relationship between clinical diagnosis and mucous wet test and moisture test on tongue and between age and moisture test on tongue. Feeling of dry mouth, clinical diagnosis and results of diagnostic measurement were not coincided necessarily. When two dimensions electrophoresis were done, isoelectrophoresis of saliva was difficult because many proteins content were disappeared after centrifugation to remove residues of whole saliva contaminated with disrupted epithelial cells and oral microorganisms. The molecular weight of salivary protein varied abroad and especially high molecular weight of protein disturbed the analysis. As enzymatic degrad ation of saliva was tried, high molecular weight molecule were effectively degraded by trypsin, on the other hand degradation by Endo-α-NAc-Galactosamidase and a-N-Acetyl-Galactos-aminidase were limited. These results suggested that fragments of salivary proteins by enzymatic treatment should be applied onto 2-D electrophoresis. More study was need for development of clinical measurement for dry mouth.

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  • Research on HW/SW Co-design of Network Systems with Timing Constraints

    Grant number:15300016  2003 - 2005

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    HIGASHINO Teruo, YASUMOTO Keiichi, NAKATA Akio, UMEDU Takaaki

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    Grant amount:\6600000 ( Direct expense: \6600000 )

    Due to the progress of the high-speed wireless network technologies such as WLAN and WCDMA, many new functions like web browsing, high-quality audio playback, digital camera, and video telephony have been integrated into cellular phone terminals. Various components including CPU,DSP, memory and CCD are used to realize such highly functional terminals. In order to shorten the development period and save the total cost of components satisfying expected performance and timing constraints, we need methods for efficiently developing a real-time embedded system using general components. In this paper, we propose a method for designing high-reliable real-time embedded systems with FPGA and general hardware components. In our method, we specify a system as a parallel composition of concurrent periodic EFSMs with timing constraints. We give performance values like data processing time and data input/output time as parameters of transition conditions in the EFSMs. Using a parametric model checking technique, we derive a parameter condition C which must hold for a system specification S to proceed without deadlocks and satisfy given timing constraints R. By preparing a list of cost-performance characteristics of available components and substituting their values to the derived parameter condition C we can automatically select an appropriate combination of components which minimizes the total cost. We have developed a design support tool based on the proposed technique. From a system specification, our synthesis tool can derive an RT-level VHDL description which can be synthesized as an FPGA circuit for controlling the components and transferring data among them. We have applied our technique to development of a basic functionality of a cellular phone and confirmed its usefulness.

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  • Hardware Synthesis of High-speed Network Monitors

    Grant number:13650409  2001 - 2002

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    HIGASHINO Teruo, NAKATA Akio, YASUMOTO Eeiichi, FUNABIKI Nobuo, UMEDU Takaaki, YAMAGUCHI Hirozumi

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    Grant amount:\2700000 ( Direct expense: \2700000 )

    Due to recent progress of the Internet, We need high-speed network monitors which can observe millions of packets per second. This research proposes a technique to synthesize hardware circuits from formal specifications of high-Speed network monitors described in LOTOS language.In the proposed method, a given network monitor is modeled as concurrent EFSMs, and data exchange among them is specified using multi-rendezvous in LOTOS. Depending on monitoring items and network speeds,We must derive different hardware circuits. For such parameter values, the proposed method can automatically select suitable hardware modules and adjust parameter values of the derived hardware component. We have developed a tool to generate the corresponding RT-level VHDL Specification from a given specification, and synthesize an FPGA circuit from the derived VHDL description. From our experiments, We have confirmed that the generated circuits have enough speeds for monitoring packets in Gigabit Ethernet.

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  • Hardware Synthesis of Communication Protocols in Real-Time LOTOS Language

    Grant number:11650379  1999 - 2000

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    HIGASHINO Teruo, OKANO Kozo, KITAMICHI Junji, YASUMOTO Keiichi, NAKATA Akio, KITAJIMA Akira

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    Grant amount:\2900000 ( Direct expense: \2900000 )

    This research proposes a concurrent periodic EFSMs model and a technique to synthesize hardware circuits from specifications of real-time systems described in Real-Time LOTOS language. In the proposed model, data exchange by synchronous execution of the same events in multiple EFSMs can be specified as multi-way synchronization in LOTOS.The executable time range of each event can be given as a logical conjunction of linear inequalities of the execution time of its preceding events. Since each EFSM has some branches and some combination of branches of those EFSMs may not be executable because of their timing constraints, the proposed synthesis technique finds only executable combination of branches from a given specification and generates a scheduler for event sequences in each executable combination of branches. We have developed a tool to generate the corresponding RTL-level VHDL specification from a given specification, and generated circuits from some specifications such as a video playback chip. From those experiments, we have confirmed that the performance and size of the generated circuits are reasonable for practical use.

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  • 可変構造アーキテクチャに対する配置・配線設計支援アルゴリズムの研究

    Grant number:11780218  1999

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    船曳 信生

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    Grant amount:\2200000 ( Direct expense: \2200000 )

    本年度の研究では、可変構造アーキテクチャ向けとして、信号伝搬遅延の最小化を目指した配線構造の提案と、回路設計支援のための5段階アルゴリズムの中での1)各グループ毎の各回路分割の論理ブロック配置,2)新しい配線構造向けの配線配置に関して,各問題の定式化(制約条件・目的関数の定式化)と探索アルゴリズムの提案を行った.提案する配線構造では,各配線セグメントの接続スイッチを,同一セグメント構成では同じ位置に,異なるセグメント構成間では違えて配置することにより,構造の単純化と配線可能性の向上を目指した.提案アルゴリズムでは,近年のVLSI回路の大規模化に対応するために,得られる解の精度を悪化させずに,実行時の計算時間の短縮化と必要メモリー量の最小化を実現することを目指した.具体的には,我々の研究グループで提案している貧欲法とランダム交換法で構成させる、2段階近似アルゴリズム(2DOM)をベースとしている.提案アルゴリズムの性能評価には,9種類のMCNCベンチマーク例題回路を採用した.本シミュレーション結果では,まず各回路分割の論理ブロック配置アルゴリズムにより,シミュレーティッドアニーリングを長時間適用して得られる高精度の準最適解に比べ,わずか100分の1の時間で約7%のコスト悪化に迎えられる解が得られことを示した.また,配線アルゴリズムでは,従来の配線構造に比べ,ほぼ同程度の信号伝搬遅延を有する解を,その約3分の1の計算期間,および,約2分の1の必要メモリー量で得られることを示した.

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  • Study of the implementation method for Newral Network Argoritm with a Multi-Context Dynamically Reconfigurable FPGA

    Grant number:09680338  1997 - 1999

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    KITAMICHI Junji, HIGASHINO Teruo, FUNABIKI Nobuo

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    Grant amount:\3200000 ( Direct expense: \3200000 )

    In this study, We propose an implementation method of a Multi-Context Dynamically Reconfigurable FPGA and a CAD algorithm for optimal use of it. Multi-Context Dynamically Reconfigurable FPGA is a VLSI which can be programmed during system operation with better reconfiguration time-efficiency than conventional Reconfigurable FPGA. We evaluated the hardware cost to add the Multi-Context Dynamically Reconfigurable FPGA by the result of synthesis of the hardware description of the Multi-Context Dynamically Reconfigurable FPGA. And We also evaluated the improvement of CLB (Configurable Logic Block) or bus usage by the implementation of the Neural Network Algorithm compared with conventional Reconfigurable FPGA. The CAD algorithm for Multi-Context FPGA minimizes reconfiguration time overhead proportional to the amount of the reconfiguration data. It inputs a finite state machine and outputs subsets of states called pages which is a reconfiguration unit of Multi-Context FPGA. The performance of the proposed algorithm is demonstrated experimentally.

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  • ニューラルネットによるFPGA配線最適化アルゴリズムの研究

    Grant number:09780274  1997 - 1998

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    舩曳 信生

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    Grant amount:\2000000 ( Direct expense: \2000000 )

    FPGA(Field Programmable Gate Array)は,ユーザーによる動作仕様の設定可能な集積回路として,短期間・低コストのVLSIシステム開発に利用されている.FPGAは,主として論理セル配列とセル端子間配線エリアから構成され,その効率的使用・集積度の向上のためには,端子間配線配置の最適化が非常に重要である.そこで本年度における研究では,昨年度の研究において提案したニューラルネットワークを用いた3段階配線最適化アルゴリズムの性能評価,および,実用化の目処を得ることを目標に研究を推進した.本アルゴリズムは,1)各配線に対する経路候補の抽出,2)貪欲法による各配線の初期配置の探索,3)ニューラルネットワークによる配線の初期配置の改善,の3段階で構成されている.本研究では,まず,提案する3段階アルゴリズムを実装した計算機シミュレー夕を作成し,実際のFPGA上の実装回路を想定して生成した複数の回路例題に対する本アルゴリズムの最適化性能の評価を行った.その結果,提案アルゴリズムは,従来アルゴリズムよりも計算時間を長く必要とするものの,配線配置に必要な総配線長を短くすることができ,同時に必要とする最大チャネル幅を小さくできることが明らかとなった.次に,実際の回路をFPGAに実装した場合における配線配置の最適化性能の評価を行うために,FPGA上で小規模のニューラルネットワークを実現する回路を設計し,その実現可能性を探索した.その結果,提案アルゴリズムによるFPGA上での配線配置の最適化の実用化の目処を得た.

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  • 高位記述言語によるニューラルネットワークの設計と評価

    Grant number:08680364  1996

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    西川 清史, 北道 淳司, 舩曵 信生

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    Grant amount:\1500000 ( Direct expense: \1500000 )

    1.ニューラルネットワークモデルの検討
    ニューラルネットワークによる並列アルゴリズムの例題として、衛星通信チャンネル割り当て問題、N-Queens問題、ネットワーク割り当て問題、グラフのマックスカット問題等の最適化問題を選び、これをハード化するためのニューラルネットワークモデルを提案した。特に、N-Queens問題について、ニューロン単体機能とニューロン間結合機能を定め、それぞれについてハード化に必要なデータタイプ(実現するレジスタのビット数など)やアーキテクチャ(データ転送方式など)を決定した。
    2.高位記述言語によるニューラルネットワーク設計
    ニューロン単体とそれらを結合するネットワークについて、それぞれ我々が既に開発している代数的記述言語(ASL)などを用いてトップダウン設計を行った。さらに、C言語で表現した回路を変換して、動作シミュレータ及び回路記述言語SFL(NTT開発)へ入力して、動作シミュレータにより、記述されたニューラルネットワークの性能評価を行い、またSFL用のパルテノンを利用して、回路規模の評価等を行った。
    3.ニューラルネットワーク設計と実現性評価
    設計例題として、N-Queens問題についてCADを用いて回路合成を行い、本手法の有効性と実現性を評価した。回路規模については、アルゴリズムのソフトウエアによる実現と比較して、同等の資源利用率(ソフトにおけるメモリ使用,ハードにおけるゲート数など)で実現できることを示した。また、計算時間のオーダをn^3からnまで短縮できることを示し、本手法の有効性を示した。

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  • ニューラルネットワークによるVLSI配線最適化アルゴリズムの研究

    Grant number:07780263  1995

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    船曳 信生

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    Grant amount:\900000 ( Direct expense: \900000 )

    本研究では、人工的ニューラルネットワークの応用により、工学上重要な組合せ最適化問題であるVLSI配線最適化問題の並列アルゴリズムの研究を行った。ニューラルネットワークは、脳の有する高度な情報処理機能に着目し、その構造を数学的に表現することにより、計算機上に実現するための手法である。ニューラルネットワークを組合せ最適化問題のアルゴリズムとして見た場合における特長は、並列性および汎用性である。すなわち、多数のプロセッサを同時に使用することにより、計算速度の飛躍的向上が図れるのみならず、エネルギー関数と呼ばれる評価式の変更により、種々の問題に適用可能である。
    本研究では、まず、VLSIチャネル内配線配置の最適化のため、必要な面積を最小とするための各配線の配置問題に関する並列アルゴリズムの研究を行った。次に、VLSI配線配置の設計上重要なビアと呼ばれるレイヤー間結合点の最小化問題、VLSI配線最適化問題の基礎となる最大クリーク問題の研究も行った。さらに、工学上重要なもう一つの組合せ最適化問題であるネットワークの通信パケット制御問題への本研究成果の適用を図った。これら本研究で対象とした組合せ最適化問題は、いずれもNP完全と呼ばれる困難な問題である。本研究では、それぞれの問題において、ニューラルネットワークに基づく新しい並列アルゴリズムの提案を行った。シミュレーションにより、提案する並列アルゴリズムが、従来アルゴリズムよりも優れた解の精度を得ることを示した。

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  • Internship in Engineering and Science (2021academic year) Year-round  - その他

  • Information Security (2021academic year) 3rd and 4th semester  - 金5,金6,金7,金8

  • Special Lecturer of Information Security (2021academic year) Late  - 金4,金5,金6,金7,金8

  • Information-oriented society and technology (2021academic year) 1st and 2nd semester  - その他

  • Introduction to Information and Communication Professionals (2021academic year) Prophase  - その他

  • Specific Research of Electronics and Information Systems Engineering (2021academic year) Year-round  - その他

  • Introduction to Electrical and Communication (2021academic year) special  - その他

  • Introduction to Electrical and Communication (2021academic year) special  - その他

  • Special Lecture of ICT-utilized Business Mind (2021academic year) Prophase  - その他

  • Graph Theory (2020academic year) Fourth semester  - 月7,月8,木3,木4

  • System Security and Optimization (2020academic year) Prophase  - 月5,月6

  • Theory of Distributed Algorithms (2020academic year) Prophase  - その他

  • Seminar in Distributed System Design (2020academic year) Prophase

  • Seminar in Distributed System Design (2020academic year) Year-round  - その他

  • Seminar in Distributed System Design (2020academic year) Other  - その他

  • Internship in Engineering and Science (2020academic year) Year-round  - その他

  • Information Security (2020academic year) 3rd and 4th semester  - 金5,金6,金7,金8

  • Special Lecturer of Information Security (2020academic year) Late  - 金

  • Introduction to Information Processing 2 (2020academic year) Second semester  - 木1,木2

  • Information-oriented society and technology (2020academic year) 1st and 2nd semester  - その他

  • Introduction to Information and Communication Professionals (2020academic year) Prophase  - その他

  • Specific Research of Electronics and Information Systems Engineering (2020academic year) Year-round  - その他

  • Introduction to Electrical and Communication (2020academic year) Summer concentration  - その他

  • Introduction to Electrical and Communication (2020academic year) Summer concentration  - その他

  • Special Lecture of ICT-utilized Business Mind (2020academic year) Prophase  - その他

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