2024/12/24 更新

写真a

フナビキ ノブオ
舩曵 信生
FUNABIKI Nobuo
所属
環境生命自然科学学域 教授
職名
教授
外部リンク

学位

  • 博士(工学) ( 東京大学 )

研究キーワード

  • 教育工学

  • 無線ネットワーク

  • Information and Communication Technology

  • Optimization Algorithms

  • Web Systems

  • Webシステム

  • Educational Technology

  • Wireless Networks

  • 情報通信工学

  • 最適化アルゴリズム

研究分野

  • 人文・社会 / 教育工学

  • 情報通信 / 情報ネットワーク

  • 情報通信 / 情報学基礎論

  • 情報通信 / 計算機システム

  • 情報通信 / ヒューマンインタフェース、インタラクション  / 運動支援

学歴

  • 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年

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    国名: アメリカ合衆国

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  • ケースウェスタンリザーブ大学    

    - 1991年

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  • 東京大学   The Faculty of Engineering   Department of Mathematical Engineering and Information Physics

    - 1984年

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    国名: 日本国

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  • 東京大学   Faculty of Engineering  

    - 1984年

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経歴

  • Graduate School of Natural Science and Technology,Okayama University

    2004年 - 現在

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  • 岡山大学   Faculty of Engineering

    2001年 - 現在

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    国名:日本国

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

    1995年 - 2001年

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  • 大阪大学   School of Engineering Science Direct Affiliates

    1994年 - 1995年

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

    1994年 - 1995年

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  • 住友金属工業株式会社 職員(技術系)

    1984年 - 1994年

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  • Technical Staff,Sumitomo Metal Industries, Ltd.

    1984年 - 1994年

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▼全件表示

所属学協会

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委員歴

  • IEEE Consumer Technology Society   Vice President for Conferences  

    2023年1月 - 2024年12月   

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    団体区分:学協会

  • IEEE Consumer Technology Society   Vice President  

    2023年1月 - 2024年12月   

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    団体区分:学協会

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  • IEEE   IEEE Hiroshima Section Chairman  

    2014年   

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    団体区分:学協会

    IEEE

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  • IEEE   広島支部支部長  

    2014年   

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    団体区分:学協会

    IEEE

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論文

  • An Implementation of Web-Based Answer Platform in the Flutter Programming Learning Assistant System Using Docker Compose 招待 査読

    Lynn Htet Aung, Soe Thandar Aung, Nobuo Funabiki, Htoo Htoo Sandi Kyaw, Wen-Chung Kao

    Electronics   13 ( 24 )   4878 - 4878   2024年12月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    Programming has gained significant importance worldwide as societies increasingly rely on computer application systems. To support novices in learning various programming languages, we have developed the Programming Learning Assistant System (PLAS). It offers several types of exercise problems with different learning goals and levels for step-by-step self-study. As a personal answer platform in PLAS, we have implemented a web application using Node.js and EJS for Java and Python programming. Recently, the Flutter framework with Dart programming has become popular, enabling developers to build applications for mobile, web, and desktop environments from a single codebase. Thus, we have extended PLAS by implementing the Flutter environment with Visual Studio Code to support it. Additionally, we have developed an image-based user interface (UI) testing tool to verify student source code by comparing its generated UI image with the standard one using the ORB and SIFT algorithms in OpenCV. For efficient distribution to students, we have generated Docker images of the answer platform, Flutter environment, and image-based UI testing tool. In this paper, we present the implementation of a web-based answer platform for the Flutter Programming Learning Assistant System (FPLAS) by integrating three Docker images using Docker Compose. Additionally, to capture UI images automatically, an Nginx web application server is adopted with its Docker image. For evaluations, we asked 10 graduate students at Okayama University, Japan, to install the answer platform on their PCs and solve five exercise problems. All the students successfully completed the problems, which confirms the validity and effectiveness of the proposed system.

    DOI: 10.3390/electronics13244878

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  • A Study of Exergame System Using Hand Gestures for Wrist Flexibility Improvement for Tenosynovitis Prevention 査読

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

    Information   15 ( 10 )   622 - 622   2024年10月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    Currently, as an increasing number of people have been addicted to using cellular phones, smartphone tenosynovitis has become common from long-term use of fingers for their operations. Hand exercise while playing video games, which is called exergame, can be a good solution to provide enjoyable daily exercise opportunities for its prevention, particularly, for young people. In this paper, we implemented a simple exergame system with a hand gesture recognition program made in Python using the Mediapipe library. We designed three sets of hand gestures to control the key operations to play the games as different exercises useful for tenosynovitis prevention. For evaluations, we prepared five video games running on a web browser and asked 10 students from Okayama and Hiroshima Universities, Japan, to play them and answer 10 questions in the questionnaire. Their playing results and System Usability Scale (SUS) scores confirmed the usability of the proposal, although we improved one gesture set to reduce its complexity. Moreover, by measuring the angles for maximum wrist movements, we found that the wrist flexibility was improved by playing the games, which verifies the effectiveness of the proposal.

    DOI: 10.3390/info15100622

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  • An Independent Learning System for Flutter Cross-Platform Mobile Programming with Code Modification Problems 招待 査読

    Safira Adine Kinari, Nobuo Funabiki, Soe Thandar Aung, Khaing Hsu Wai, Mustika Mentari, Pradini Puspitaningayu

    Information   15 ( 10 )   614 - 614   2024年10月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    Nowadays, with the common use of smartphones in daily lives, mobile applications have become popular around the world, which will lead to a rise in Flutter framework. Developed by Google, Flutter with Dart programming provides a cross-platform development environment to create visually appealing and responsive user interfaces across mobile, web, and desktop platforms using a single codebase. However, due to time and staff limitations, the Flutter/Dart programming course is not included in curricula, even in IT departments in universities. Therefore, independent learning environments for students are essential to meet this growing popularity. Previously, we have developed programming learning assistant system (PLAS) as a web-browser-based self-learning platform for novice students. PLAS offers various types of exercise problems designed to cultivate programming skills step-by-step through a lot of code reading and code writing practices. Among them, one particular type is the code modification problem (CMP), which asks to modify the given source code to satisfy the new specifications. CMP is expected to be solved by novices with little effort if they have knowledge of other programming languages. Thus, PLAS with CMP will be an excellent platform for independent learning. In this paper, we present PLAS with CMP for the independent learning of Flutter/Dart programming. To improve the readability of the source code by students, we provided rich comments on grammar or behaviors. Besides, the code can be downloaded so that students can check and run it on an IDE. For evaluations, we generated 38 CMP instances for basic and multimedia/storage topics in Flutter/Dart programming and assigned them to 21 master students at Okayama University, Japan, who have never studied it. The results confirm the validity of the proposal.

    DOI: 10.3390/info15100614

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  • A Study of a Drawing Exactness Assessment Method Using Localized Normalized Cross-Correlations in a Portrait Drawing Learning Assistant System 招待 査読

    Yue Zhang, Zitong Kong, Nobuo Funabiki, Chen-Chien Hsu

    Computers   13 ( 9 )   215 - 215   2024年8月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    Nowadays, portrait drawing has gained significance in cultivating painting skills and human sentiments. In practice, novices often struggle with this art form without proper guidance from professionals, since they lack understanding of the proportions and structures of facial features. To solve this limitation, we have developed a Portrait Drawing Learning Assistant System (PDLAS) to assist novices in learning portrait drawing. The PDLAS provides auxiliary lines as references for facial features that are extracted by applying OpenPose and OpenCV libraries to a face photo image of the target. A learner can draw a portrait on an iPad using drawing software where the auxiliary lines appear on a different layer to the portrait. However, in the current implementation, the PDLAS does not offer a function to assess the exactness of the drawing result for feedback to the learner. In this paper, we present a drawing exactness assessment method using a Localized Normalized Cross-Correlation (NCC) algorithm in the PDLAS. NCC gives a similarity score between the original face photo and drawing result images by calculating the correlation of the brightness distributions. For precise feedback, the method calculates the NCC for each face component by extracting the bounding box. In addition, in this paper, we improve the auxiliary lines for the nose. For evaluations, we asked students at Okayama University, Japan, to draw portraits using the PDLAS, and applied the proposed method to their drawing results, where the application results validated the effectiveness by suggesting improvements in drawing components. The system usability was also confirmed through a questionnaire with a SUS score. The main finding of this research is that the implementation of the NCC algorithm within the PDLAS significantly enhances the accuracy of novice portrait drawings by providing detailed feedback on specific facial features, proving the system’s efficacy in art education and training.

    DOI: 10.3390/computers13090215

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  • An Image-Based User Interface Testing Method for Flutter Programming Learning Assistant System 招待 査読

    Soe Thandar Aung, Nobuo Funabiki, Lynn Htet Aung, Safira Adine Kinari, Khaing Hsu Wai, Mustika Mentari

    Information   15 ( 8 )   464 - 464   2024年8月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    Flutter has become popular for providing a uniform development environment for user interfaces (UIs) on smart phones, web browsers, and desktop applications. We have developed the Flutter programming learning assistant system (FPLAS) to assist its novice students’ self-study. We implemented the Docker-based Flutter environment with Visual Studio Code and three introductory exercise projects. However, the correctness of students’ answers is manually checked, although automatic checking is necessary to reduce teachers’ workload and provide quick responses to students. This paper presents an image-based user interface (UI) testing method to automate UI testing by the answer code using the Flask framework. This method produces the UI image by running the answer code and compares it with the image made by the model code for the assignment using ORB and SIFT algorithms in the OpenCV library. One notable aspect is the necessity to capture multiple UI screenshots through page transitions by user input actions for the accurate detection of changes in UI elements. For evaluations, we assigned five Flutter exercise projects to fourth-year bachelor and first-year master engineering students at Okayama University, Japan, and applied the proposed method to their answers. The results confirm the effectiveness of the proposal.

    DOI: 10.3390/info15080464

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  • Performance Investigations of VSLAM and Google Street View Integration in Outdoor Location-Based Augmented Reality under Various Lighting Conditions 招待 査読

    Komang Candra Brata, Nobuo Funabiki, Prismahardi Aji Riyantoko, Yohanes Yohanie Fridelin Panduman, Mustika Mentari

    Electronics   13 ( 15 )   2930 - 2930   2024年7月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    The growing demand for Location-based Augmented Reality (LAR) experiences has driven the integration of Visual Simultaneous Localization And Mapping (VSLAM) with Google Street View (GSV) to enhance the accuracy. However, the impact of the ambient light intensity on the accuracy and reliability is underexplored, posing significant challenges in outdoor LAR implementations. This paper investigates the impact of light conditions on the accuracy and reliability of the VSLAM/GSV integration approach in outdoor LAR implementations. This study fills a gap in the current literature and offers valuable insights into vision-based approach implementation under different light conditions. Extensive experiments were conducted at five Point of Interest (POI) locations under various light conditions with a total of 100 datasets. Descriptive statistic methods were employed to analyze the data and assess the performance variation. Additionally, the Analysis of Variance (ANOVA) analysis was utilized to assess the impact of different light conditions on the accuracy metric and horizontal tracking time, determining whether there are significant differences in performance across varying levels of light intensity. The experimental results revealed that a significant correlation (p < 0.05) exists between the ambient light intensity and the accuracy of the VSLAM/GSV integration approach. Through the confidence interval estimation, the minimum illuminance 434 lx is needed to provide a feasible and consistent accuracy. Variations in visual references, such as wet surfaces in the rainy season, also impact the horizontal tracking time and accuracy.

    DOI: 10.3390/electronics13152930

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  • A User Location Reset Method through Object Recognition in Indoor Navigation System Using Unity and a Smartphone (INSUS) 招待 査読

    Evianita Dewi Fajrianti, Yohanes Yohanie Fridelin Panduman, Nobuo Funabiki, Amma Liesvarastranta Haz, Komang Candra Brata, Sritrusta Sukaridhoto

    Network   4 ( 3 )   295 - 312   2024年7月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    To enhance user experiences of reaching destinations in large, complex buildings, we have developed a indoor navigation system using Unity and a smartphone called INSUS. It can reset the user location using a quick response (QR) code to reduce the loss of direction of the user during navigation. However, this approach needs a number of QR code sheets to be prepared in the field, causing extra loads at implementation. In this paper, we propose another reset method to reduce loads by recognizing information of naturally installed signs in the field using object detection and Optical Character Recognition (OCR) technologies. A lot of signs exist in a building, containing texts such as room numbers, room names, and floor numbers. In the proposal, the Sign Image is taken with a smartphone, the sign is detected by YOLOv8, the text inside the sign is recognized by PaddleOCR, and it is compared with each record in the Room Database using Levenshtein distance. For evaluations, we applied the proposal in two buildings in Okayama University, Japan. The results show that YOLOv8 achieved mAP@0.5 0.995 and mAP@0.5:0.95 0.978, and PaddleOCR could extract text in the sign image accurately with an averaged CER% lower than 10%. The combination of both YOLOv8 and PaddleOCR decreases the execution time by 6.71s compared to the previous method. The results confirmed the effectiveness of the proposal.

    DOI: 10.3390/network4030014

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  • A Reference Paper Collection System Using Web Scraping 招待 査読

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

    Electronics   13 ( 14 )   2700 - 2700   2024年7月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    Collecting reference papers from the Internet is one of the most important activities for progressing research and writing papers about their results. Unfortunately, the current process using Google Scholar may not be efficient, since a lot of paper files cannot be accessed directly by the user. Even if they are accessible, their effectiveness needs to be checked manually. In this paper, we propose a reference paper collection system using web scraping to automate paper collections from websites. This system can collect or monitor data from the Internet, which is considered as the environment, using Selenium, a popular web scraping software, as the sensor; this examines the similarity against the search target by comparing the keywords using the Bert model. The Bert model is a deep learning model for natural language processing (NLP) that can understand context by analyzing the relationships between words in a sentence bidirectionally. The Python Flask is adopted at the web application server, where Angular is used for data presentations. For the evaluation, we measured the performance, investigated the accuracy, and asked members of our laboratory to use the proposed method and provide their feedback. Their results confirm the method’s effectiveness.

    DOI: 10.3390/electronics13142700

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  • On Installation of Java Programming Learning Assistant System Platform in University Course 査読

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

    2024 International Conference on Consumer Electronics - Taiwan (ICCE-Taiwan)   569 - 570   2024年7月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/icce-taiwan62264.2024.10674397

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  • An Implementation of Java Programming Assistant System in University Course

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

    2024 International Conference on Consumer Electronics - Taiwan (ICCE-Taiwan)   567 - 568   2024年7月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/icce-taiwan62264.2024.10674115

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  • Difficulty Evaluation of Yoga Poses by Angular Velocity and Body Area Calculation for GPU-Based Yoga Self-Practice System

    Cheng-Liang Shih, Jun-You Liu, Irin Tri Anggraini, Yanqi Xiao, Nobuo Funabiki, Chih-Peng Fan

    2024 IEEE Gaming, Entertainment, and Media Conference (GEM)   1 - 4   2024年6月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/gem61861.2024.10585480

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  • A Design of Handgrip Exergame System for Hypertension Prevention

    Irin Tri Anggraini, Yanqi Xiao, Nobuo Funabiki, Cheng-Liang Shih, Jun-You Liu, Chih-Peng Fan

    2024 IEEE Gaming, Entertainment, and Media Conference (GEM)   1 - 2   2024年6月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/gem61861.2024.10585557

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  • Answer code validation program with test data generation for code writing problem in Java programming learning assistant system 査読

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

    Engineering Letters   32 ( 5 )   981 - 994   2024年5月

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  • A drawing accuracy evaluation method with localized normalized cross correlation for portrait drawing learning assistant system 査読

    Yue Zhang, Zitong Kong, Nobuo Funabiki

    2024 International Conference on Information Technology and Education Technology (ITET)   2024年5月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • A study of code typing problems as start-up programming practices in Java programming learning assistant system 査読

    Mustika Mentari, Nobuo Funabiki, Noprianto Noprianto, Yan Watequlis Syaifudin, Khaing Hsu Wai, Komang Candra Brata, Pradini Puspitaningayu

    2024 International Conference on Information Technology and Education Technology (ITET)   2024年5月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • A Study of Learning Environment for Initiating Flutter App Development Using Docker 招待 査読

    Soe Thandar Aung, Nobuo Funabiki, Lynn Htet Aung, Safira Adine Kinari, Mustika Mentari, Khaing Hsu Wai

    Information   15 ( 4 )   191 - 191   2024年3月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    The Flutter framework with Dart programming allows developers to effortlessly build applications for both web and mobile from a single codebase. It enables efficient conversions to native codes for mobile apps and optimized JavaScript for web browsers. Since utilizing a wide range of widgets in Flutter ensures consistent experiences on various devices for users, it becomes crucial in programming education by providing a unified environment for learning app development while reducing the need for platform-specific knowledge. However, the setup of the Flutter environment is challenging for novice students due to its multiple steps, such as installing dependencies and configuring environments. To support independent learning for these students, it is essential to simplify the setup by providing user-friendly instructions and automated tools. In this paper, we present a Docker-based environment for Flutter app developments across Windows, Linux, and Mac through Visual Studio Code, ensuring a unified learning experience. This paper aims to simplify complex configurations and address the obstacles encountered by students when initiating Flutter projects. For the evaluation, we prepared three simple Flutter projects along with the setup environment in a Docker container. Then, we asked 24 Master’s students at Okayama University, Japan, to install the environment and modify the source codes in the projects independently by following the given instructions. The results show that all the students successfully completed the assignments, which confirms the efficiency and validity of our proposal.

    DOI: 10.3390/info15040191

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  • An Application of Throughput Request Satisfaction Method for Maximizing Concurrent Throughput in WLAN for IoT Application System 査読

    Bin Wu, Nobuo Funabiki, Sujan Chandra Roy, Md. Mahbubur Rahman, Dezheng Kong, Shihao Fang

    Sensors   24 ( 7 )   2173 - 2173   2024年3月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    With the wide applications of the Internet of Things (IoT) in smart home systems, IEEE 802.11n Wireless Local Area Networks (WLANs) have become a frequently chosen communication technology due to their adaptability and affordability. In a high-density network of devices such as the smart home scenerio, a host often meets interferences from other devices and unequal Received Signal Strength (RSS) from Access Points (APs). This results in throughput unfairness/insufficiency problems between hosts communicating concurrently in WLAN. Previously, we have studied the throughput request satisfaction method to address this problem. It calculates the target throughput from measured single and concurrent throughputs of hosts and controls the actual throughput at this target one by applying traffic shaping at the AP. However, the insufficiency problem of maximizing the throughput is not solved due to interferences from other hosts. In this paper, we present an extension of the throughput request satisfaction method to maximize the throughput of a high-priority host under concurrent communications. It recalculates the target throughput to increase the actual throughput as much as possible while the other hosts satisfy the least throughput. For evaluations, we conduct experiments using the test-bed system with Raspberry Pi as the AP devices in several topologies in indoor environments. The results confirm the effectiveness of our proposal.

    DOI: 10.3390/s24072173

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  • A Design and Implementation of Stationery Product Recognition Method Using Two-Stage YOLO v8 Model

    Xudong Zhou, Nobuo Funabiki, Yanhui Jing, Yanqi Xiao, Wen-Chung Kao

    2024 12th International Conference on Information and Education Technology (ICIET)   327 - 332   2024年3月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/iciet60671.2024.10542804

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  • Analysis of Solution Results of Code Writing Problems for Basic Object-Oriented Programming Study in University Java Programming Course

    Khaing Hsu Wai, Nobuo Funabiki, Soe Thandar Aung, Ryo Hashimoto, Daiki Yokoyama, Wen-Chung Kao

    2024 12th International Conference on Information and Education Technology (ICIET)   87 - 92   2024年3月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/iciet60671.2024.10542814

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  • A Survey of AI Techniques in IoT Applications with Use Case Investigations in the Smart Environmental Monitoring and Analytics in Real-Time IoT Platform 招待 査読

    Yohanes Yohanie Fridelin Panduman, Nobuo Funabiki, Evianita Dewi Fajrianti, Shihao Fang, Sritrusta Sukaridhoto

    Information   15 ( 3 )   153 - 153   2024年3月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    In this paper, we have developed the SEMAR (Smart Environmental Monitoring and Analytics in Real-Time) IoT application server platform for fast deployments of IoT application systems. It provides various integration capabilities for the collection, display, and analysis of sensor data on a single platform. Recently, Artificial Intelligence (AI) has become very popular and widely used in various applications including IoT. To support this growth, the integration of AI into SEMAR is essential to enhance its capabilities after identifying the current trends of applicable AI technologies in IoT applications. In this paper, we first provide a comprehensive review of IoT applications using AI techniques in the literature. They cover predictive analytics, image classification, object detection, text spotting, auditory perception, Natural Language Processing (NLP), and collaborative AI. Next, we identify the characteristics of each technique by considering the key parameters, such as software requirements, input/output (I/O) data types, processing methods, and computations. Third, we design the integration of AI techniques into SEMAR based on the findings. Finally, we discuss use cases of SEMAR for IoT applications with AI techniques. The implementation of the proposed design in SEMAR and its use to IoT applications will be in future works.

    DOI: 10.3390/info15030153

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  • A blank element selection algorithm for element fill-in-blank problems in client-side web programming 査読

    Huiyu Qi, Nobuo Funabiki, Khaing Hsu Wai, Flasma Veronicha Hendryanna, Khin Thet Mon, Mustika Mentari, Wen Chung Kao

    Engineering Letters   32 ( 3 )   684 - 700   2024年3月

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    担当区分:責任著者  

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  • An Enhancement of Outdoor Location-Based Augmented Reality Anchor Precision through VSLAM and Google Street View 招待 査読

    Komang Candra Brata, Nobuo Funabiki, Yohanes Yohanie Fridelin Panduman, Evianita Dewi Fajrianti

    Sensors   24 ( 4 )   1161 - 1161   2024年2月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    Outdoor Location-Based Augmented Reality (LAR) applications require precise positioning for seamless integrations of virtual content into immersive experiences. However, common solutions in outdoor LAR applications rely on traditional smartphone sensor fusion methods, such as the Global Positioning System (GPS) and compasses, which often lack the accuracy needed for precise AR content alignments. In this paper, we introduce an innovative approach to enhance LAR anchor precision in outdoor environments. We leveraged Visual Simultaneous Localization and Mapping (VSLAM) technology, in combination with innovative cloud-based methodologies, and harnessed the extensive visual reference database of Google Street View (GSV), to address the accuracy limitation problems. For the evaluation, 10 Point of Interest (POI) locations were used as anchor point coordinates in the experiments. We compared the accuracies between our approach and the common sensor fusion LAR solution comprehensively involving accuracy benchmarking and running load performance testing. The results demonstrate substantial enhancements in overall positioning accuracies compared to conventional GPS-based approaches for aligning AR anchor content in the real world.

    DOI: 10.3390/s24041161

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  • An implementation of web-based personal platform for programming learning assistant system with instance file update function 査読

    Soe Thandar Aung, Lynn Htet Aung, Nobuo Funabiki, Shigo Yamaguchi, Yan Watequlis Syaifudin, Wen-Chung Kao, Engineering Le, February

    Engineering Letters   32 ( 2 )   226 - 243   2024年2月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Code Plagiarism Checking Function and Its Application for Code Writing Problem in Java Programming Learning Assistant System 招待 査読

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

    Analytics   3 ( 1 )   46 - 62   2024年1月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    A web-based Java programming learning assistant system (JPLAS) has been developed for novice students to study Java programming by themselves while enhancing code reading and code writing skills. One type of the implemented exercise problem is code writing problem (CWP), which asks students to create a source code that can pass the given test code. The correctness of this answer code is validated by running them on JUnit. In previous works, a Python-based answer code validation program was implemented to assist teachers. It automatically verifies the source codes from all the students for one test code, and reports the number of passed test cases by each code in the CSV file. While this program plays a crucial role in checking the correctness of code behaviors, it cannot detect code plagiarism that can often happen in programming courses. In this paper, we implement a code plagiarism checking function in the answer code validation program, and present its application results to a Java programming course at Okayama University, Japan. This function first removes the whitespace characters and the comments using the regular expressions. Next, it calculates the Levenshtein distance and similarity score for each pair of source codes from different students in the class. If the score is larger than a given threshold, they are regarded as plagiarism. Finally, it outputs the scores as a CSV file with the student IDs. For evaluations, we applied the proposed function to a total of 877 source codes for 45 CWP assignments submitted from 9 to 39 students and analyzed the results. It was found that (1) CWP assignments asking for shorter source codes generate higher scores than those for longer codes due to the use of test codes, (2) proper thresholds are different by assignments, and (3) some students often copied source codes from certain students.

    DOI: 10.3390/analytics3010004

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  • A Hand Gesture Exergame for Dementia Development Suppression and Its Applications to Elders

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

    2024 IEEE International Conference on Consumer Electronics (ICCE)   1 - 3   2024年1月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/icce59016.2024.10444306

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  • A Proposal of Code Writing Problem for C Programming Learning Assistant System 査読

    Htoo Htoo Sandi Kyaw, Chai Xu Min, Keiichi Kaneko, Soe Thandar Aung, Nobuo Funabiki, Annisa Anggun Puspitasari

    International Journal of Learning and Teaching   10 ( 2 )   261 - 269   2024年

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:EJournal Publishing  

    C programming has been a fundamental subject for a lot of university students studying programming lan guages, algorithms, and computer architecture. To enhance C programming education in schools, we have developed the C Programming Learning Assistant System (CPLAS) which provides a variety of programming assignments to cover different learning stages. The programming assignments offered by CPLAS allow the students to practice writing partial source code to learn grammar, code reading, and code debugging skills. However, the current assignments offered by CPLAS do not cover students to practice writing the whole C source code from scratch. Therefore, in this paper, we propose the Code Writing Problem (CWP) for students to write the C source code from scratch. In a CWP instance, a problem statement, an input list, and an expected output are given to the students. The students need to write the C source code from scratch by referring to the given information. The answer codes are marked through 1) compiling test, 2) execution test, and 3) output test. To avoid cheating by students, we use the random input generation method for each data type. To evaluate the proposal, we generated and assigned 11 CWP instances to the students. From their solution results, 10 out of 11 CWP instances achieved over 78% correct answer rate, and the feedback from the students confirmed the validity of the proposal.

    DOI: 10.18178/ijlt.10.2.261-269

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  • 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年11月

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    掲載種別:研究論文(学術雑誌)  

    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年11月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.17706/jsw.18.4.218-227

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  • OpenPose Based Yoga Poses Difficulty Estimation for Dynamic and Static Yoga Exercises 査読

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

    2023 Asia Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA ASC)   1636 - 1640   2023年10月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/apsipaasc58517.2023.10317354

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  • A Study of Exergame System Using Hand Gestures for Tenosynovitis Prevention 査読

    Yanqi Xiao, Irin Tri Anggraini, Nobuo Funabiki, Shih-Wei Shen, Chih-Peng Fan

    2023 IEEE International Conference on Consumer Electronics-Asia (ICCE-Asia)   1 - 6   2023年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/icce-asia59966.2023.10326368

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  • Improvements of Blank Element Selection Algorithm for Element Fill-in-blank Problem in Web-client Programming 査読

    Huiyu Qi, Nobuo Funabiki, Khaing Hsu Wai, Flasma Veronicha Hendryanna, Wen-Chung Kao

    2023 IEEE International Conference on Consumer Electronics-Asia (ICCE-Asia)   1 - 6   2023年10月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/icce-asia59966.2023.10326341

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  • Performance Comparison between OpenPose and TRT_Pose for Self-Practice Yoga on Embedded GPU Platform 査読

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

    2023 IEEE International Conference on Consumer Electronics-Asia (ICCE-Asia)   1 - 4   2023年10月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/icce-asia59966.2023.10326363

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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年10月

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元: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年10月

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元: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年9月

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元: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年9月

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    掲載種別:研究論文(学術雑誌)  

    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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  • A Proposal of Code Typing Problem for Basic Java Programming Learning 査読

    Mustika Mentari, Nobuo Funabiki, Huiyu Qi, Yan Watequlis Syaifudin, Imam Fahrur Rozi, Komang Candra Brata

    2023 International Electronics Symposium (IES)   520 - 526   2023年8月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/ies59143.2023.10242575

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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年7月

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    掲載種別:研究論文(学術雑誌)  

    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年6月

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    掲載種別:研究論文(学術雑誌)  

    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年4月

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    掲載種別:研究論文(学術雑誌)  

    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年1月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.3390/a16010045

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  • 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年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    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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  • 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年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/ICCE-Taiwan58799.2023.10226698

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    その他リンク: https://dblp.uni-trier.de/db/conf/icce-tw/icce-tw2023.html#LuFUK23

  • 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年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1145/3617733.3617736

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    その他リンク: 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年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/GCCE59613.2023.10315417

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    その他リンク: 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年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/GCCE59613.2023.10315422

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    その他リンク: 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年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/GCCE59613.2023.10315351

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    その他リンク: 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年

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    掲載種別:研究論文(学術雑誌)  

    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年

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    掲載種別:研究論文(学術雑誌)  

    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. 査読

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

    IAIT   38 - 5   2023年

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ACM  

    DOI: 10.1145/3628454.3631856

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    その他リンク: 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年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/GCCE59613.2023.10315512

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    その他リンク: 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年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/GCCE59613.2023.10315607

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    その他リンク: https://dblp.uni-trier.de/db/conf/gcce/gcce2023.html#AnggrainiXFHSF23

  • A Study on Eliminating Biased Node in Federated Learning.

    Reon Akai, Minoru Kuribayashi, Nobuo Funabiki

    APSIPA ASC   620 - 627   2023年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/APSIPAASC58517.2023.10317147

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  • Study on Face Landmark-based Analysis for Synthetic Media Identification Generated by Adversarial Generative Networks.

    Akinobu Ura, Minoru Kuribayashi, Nobuo Funabiki

    APSIPA ASC   1684 - 1690   2023年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/APSIPAASC58517.2023.10317492

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  • Image-Based Virtual Try-on System With Clothing-Size Adjustment.

    Minoru Kuribayashi, Koki Nakai, Nobuo Funabiki

    CoRR   abs/2302.14197   2023年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.48550/arXiv.2302.14197

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  • Gait Recognition Scheme Focusing on Operating Characteristics at Feature Points Detected by OpenPose.

    Chinatsu Tanaka, Minoru Kuribayashi, Nobuo Funabiki

    APSIPA ASC   613 - 619   2023年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/APSIPAASC58517.2023.10317291

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    その他リンク: https://dblp.uni-trier.de/db/conf/apsipa/apsipa2023.html#TanakaKF23

  • An Investigation of Running Load Comparisons of ARCore on Native Android and Unity for Outdoor Navigation System Using Smartphone

    Komang Candra Brata, Nobuo Funabiki, Sritrusta Sukaridhoto, Evianita Dewi Fajrianti, Mustika Mentari

    2023 6th International Conference on Vocational Education and Electrical Engineering: Integrating Scalable Digital Connectivity, Intelligence Systems, and Green Technology for Education and Sustainable Community Development, ICVEE 2023 - Proceeding   133 - 138   2023年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    In recent years, the utilization of location-based augmented reality (LAR) has gained popularity across various domains, including tourism, education, gaming, and advertising. The advancements in AR technology have made it easier to develop immersive LAR applications. ARCore, a widely adopted AR development library, enables the creation of location-based AR apps on Android devices. However, the implementation of ARCore in real-Time scenarios that demand significant computational resources, like outdoor pedestrian navigation, can vary depending on the chosen development environment. This research aims to explore and compare the running load performance of ARCore implementation in location-based AR applications developed with Unity and Android Native, which are two prevalent AR development platforms. The study involves building a prototype LAR application using both Unity and native Android, followed by comprehensive running load performance evaluations. The findings reveal that while both Unity and native Android apps can deliver compelling location-based AR experiences, native Android apps demonstrate superior performance and resource efficiency in outdoor scenarios, whereas Unity offers the advantage of multi-platform support and ease of development for complex 3D assets. These insights provide valuable guidance to developers in selecting the most suitable approach for developing location-based AR applications for navigation, aligning with their specific needs and requirements.

    DOI: 10.1109/ICVEE59738.2023.10348201

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  • A proposal of printed table digitization algorithm with image processing 招待 査読 国際共著

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

    Algorithms   15 ( 471 )   2022年12月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • 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年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元: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 査読 国際共著

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

    Internet of Things   20   1 - 19   2022年11月

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    担当区分:責任著者   記述言語:英語  

  • 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年11月

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    掲載種別:研究論文(学術雑誌)  

    —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年11月

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    掲載種別:研究論文(学術雑誌)  

    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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  • A Static Assignment Algorithm of Uniform Jobs to Workers in a User-PC Computing System Using Simultaneous Linear Equations

    Xudong Zhou, Nobuo Funabiki, Hein Htet, Ariel Kamoyedji, Irin Tri Anggraini, Yuanzhi Huo, Yan Watequlis Syaifudin

    Algorithms   15 ( 10 )   369 - 369   2022年10月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    Currently, the User-PC computingsystem (UPC) has been studied as a low-cost and high-performance distributed computing platform. It uses idling resources of personal computers (PCs) in a group. The job-worker assignment for minimizing makespan is critical to determine the performance of the UPC system. Some applications need to execute a lot of uniform jobs that use the identical program but with slightly different data, where they take the similar CPU time on a PC. Then, the total CPU time of a worker is almost linear to the number of assigned jobs. In this paper, we propose a static assignment algorithm of uniform jobs to workers in the UPC system, using simultaneous linear equations to find the lower bound on makespan, where every worker requires the same CPU time to complete the assigned jobs. For the evaluations of the proposal, we consider the uniform jobs in three applications. In OpenPose, the CNN-based keypoint estimation program runs with various images of human bodies. In OpenFOAM, the physics simulation program runs with various parameter sets. In code testing, two open-source programs run with various source codes from students for the Android programming learning assistance system (APLAS). Using the proposal, we assigned the jobs to six workers in the testbed UPC system and measured the CPU time. The results show that makespan was reduced by 10% on average, which confirms the effectiveness of the proposal.

    DOI: 10.3390/a15100369

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  • An investigation of code modification problem for learning server-side JavaScript programming in web application system 査読 国際共著

    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年10月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • An application of code writing problem platform for Python programming learning 査読 国際共著

    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年10月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • An implementation of code writing problem platform for Python programming learning using Node.js 査読 国際共著

    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年10月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • A proposal of code modification problem for self-study of web client programming using JavaScript 査読 国際共著

    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年9月

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    担当区分:責任著者   記述言語:英語  

  • Accuracy investigations of fingerprint-based indoor localization system Using IEEE 802.15.4 in two-floor environment 査読 国際共著

    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年9月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • An implementation of solving activity monitoring function in Android programming learning assistance system 査読 国際共著

    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年9月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • Implementation and evaluation of exercise and performance learning assistant system platform for Yoga pose practices using Node.js 査読 国際共著

    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年9月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • Design and implementation of indoor navigation for PENS visitors using augmented intelligence 査読 国際共著

    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年9月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • Implementations of integration functions in IoT application server platform 査読 国際共著

    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年9月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • Design and implementation of SEMAR IoT server platform with applications 査読 国際共著

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

    Sensors   22 ( 17 )   2022年8月

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    担当区分:責任著者   記述言語:英語  

  • A throughput fairness control method for concurrent communications in wireless local-area network with multiple access-points 査読 国際共著

    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年8月

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    担当区分:責任著者   記述言語:英語  

  • 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年8月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.3390/s22176436

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  • An Extension of Job-Worker Assignment Algorithm for Dynamic Job Migration for User-PC Computing System

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

    The 10th International Conference on Computer and Communications Management   2022年7月

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ACM  

    DOI: 10.1145/3556223.3556250

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  • A Static Uniform Job Assignment Algorithm to Workers in User-PC Computing System

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

    The 10th International Conference on Computer and Communications Management   2022年7月

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ACM  

    DOI: 10.1145/3556223.3556227

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  • An Implementation of Job Running Backup Function in User-PC Computing System

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

    2022 4th International Conference on Computer Communication and the Internet (ICCCI)   2022年7月

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/iccci55554.2022.9850241

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  • An implementation of job running backup function in user-PC computing system 査読 国際共著

    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年7月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • An implementation of exercise and performance learning assistant system platform using Node.js 査読 国際共著

    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年7月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • An investigation of learning outcomes using assignment without guide documents in Android programming learning assistance system 査読 国際共著

    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年7月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • Investigation of value trace problem for C++ programming self-study of novice students 査読 国際共著

    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年7月

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    担当区分:責任著者   記述言語:英語  

  • Design of OpenPose-based of exercise assistant system with instructor-user synchronization for self-practice dynamic Yoga 査読 国際共著

    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年7月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • An extension of job-worker assignment algorithm for dynamic job migration for user-PC computing system 査読 国際共著

    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年7月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • A static uniform job assignment algorithm to workers in user-PC computing system 査読 国際共著

    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年7月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • Code modification problems for multimedia use in JavaScript-based web client programming 査読 国際共著

    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年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • A fingerprint-based indoor localization system using IEEE 802.15.4 for staying room detection 査読 国際共著

    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年6月

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    担当区分:責任著者   記述言語:英語  

  • A proposal of job-worker assignment algorithm considering CPU core utilization for user-PC computing system 査読 国際共著

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

    International Journal of Future Computer and Communication (IJFCC)   11 ( 2 )   40 - 46   2022年5月

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    担当区分:責任著者   記述言語:英語  

  • An extension of active access-point configuration algorithm to IEEE 802.11n and 11ac dual interfaces in wireless local-area network 査読 国際共著

    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年5月

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    担当区分:責任著者   記述言語:英語  

  • Value trace problems for code reading study of JavaScript programming 査読 国際共著

    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年5月

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    担当区分:責任著者   記述言語:英語  

  • A study of three introductory exercise problems to novice students for C programming learning 査読 国際共著

    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年4月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • A study of code modification problems for Excel operations in Python programming learning assistant system 査読 国際共著

    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年4月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • An implementation of Java programming learning assistant system platform using Node.js 査読 国際共著

    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年4月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • Exercise and performance learning assistant system for self-practice dynamic Yoga by OpenPose and Fuzzy based design 査読 国際共著

    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年4月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • 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年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.3390/info13050211

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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年

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/LifeTech53646.2022.9754790

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    その他リンク: https://dblp.uni-trier.de/db/conf/lifetech/lifetech2022.html#PuspitaningayuF22

  • 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年

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    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年

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/LifeTech53646.2022.9754593

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    その他リンク: https://dblp.uni-trier.de/db/conf/lifetech/lifetech2022.html#LuCFKU22

  • 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年

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/LifeTech53646.2022.9754593

    その他リンク: https://dblp.uni-trier.de/db/conf/lifetech/lifetech2022.html#LuCFKU22

  • Classification of Screenshot Image Captured in Online Meeting System.

    Minoru Kuribayashi, Kodai Kamakari, Nobuo Funabiki

    CD-MAKE   244 - 255   2022年

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    掲載種別:研究論文(国際会議プロシーディングス)  

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

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    その他リンク: 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年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.4018/ijmcmc.301275

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  • 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年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.12720/jcm.17.8.592-599

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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年

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    掲載種別:研究論文(学術雑誌)  

    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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  • 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年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    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年

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    記述言語:英語   出版者・発行元:The Institute of Image Information and Television Engineers  

    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年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    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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  • 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年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    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 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.

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

    Internet of Things   20   100583 - 100583   2022年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.iot.2022.100583

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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 査読

    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年11月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

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

    Ariel Kamoyedji, Nobuo Funabiki, Hein Htet, Minoru Kuribayashi

    Ninth International Symposium on Computing and Networking   268 - 271   2021年11月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/CANDARW53999.2021.00051

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    その他リンク: https://dblp.uni-trier.de/db/conf/ic-nc/candar2021w.html#KamoyedjiFHK21

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

    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年11月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

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

    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年11月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/GCCE59613.2023.10315660

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    その他リンク: 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 査読

    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年11月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

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

    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年11月

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    掲載種別:研究論文(国際会議プロシーディングス)  

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

    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年11月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)  

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

    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年10月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

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

    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年10月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/GCCE53005.2021.9621949

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    その他リンク: 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 査読

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

    International Conference on Vocational Education and Electrical Engineering (ICVEE)   2021年10月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

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

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

    International Conference on Vocational Education and Electrical Engineering (ICVEE)   2021年10月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

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

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

    International Conference on Vocational Education and Electrical Engineering (ICVEE)   2021年10月

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    掲載種別:研究論文(国際会議プロシーディングス)  

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  • Implementations of Two Answer Submission Methods for Reducing Errors in Android Programming Learning Assistance System

    Yan Watequlis Syaifudin, Nobuo Funabiki, Muhammad Sofiul F. Ruslan, Devany C. Wijaya, Ikhlaashul Mu'Aasyiqiin, Abdul Rahman Patta

    2021 International Conference on Innovation and Intelligence for Informatics, Computing, and Technologies, 3ICT 2021   126 - 130   2021年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Institute of Electrical and Electronics Engineers Inc.  

    Recently, Android programming educations have become important in IT departments in universities due to the strong market demands. The Android Programming Learning Assistance System (APLAS) is a self-learning platform for Android programming. It provides assignments to students where the correctness of their answers can be checked automatically using unit testing tools through a web application. For each assignment in APLAS, students need to submit multiple files with the correct configuration as one project. However, many students cause errors in the current implementation of submitting one by one the files in the Android project made using Android Studio. In this paper, we implement two submission methods for reducing errors in APLAS. The zip-file method makes the zipped file of the Android project to be submitted. The GitHub-link method synchronizes the files in the Android project through the URL of the GitHub project. For evaluations, we asked 40 students to solve three assignments in APLAS and submit the answer files by freely choosing one method. The results show that the zip-file method was most popular and the GitHub-link method produced least errors.

    DOI: 10.1109/3ICT53449.2021.9581553

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

    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年9月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Emerald  

    <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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    その他リンク: https://www.emerald.com/insight/content/doi/10.1108/IJWIS-03-2021-0025/full/html

  • 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年9月

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/ICCE-TW52618.2021.9603085

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    その他リンク: 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. 査読

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

    IEEE International Conference on Consumer Electronics-Taiwan(ICCE-TW)   1 - 2   2021年9月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    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 査読

    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年8月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:NEWSWOOD LTD  

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

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

    ICCCM 2021: 9th International Conference on Computer and Communications Management(ICCCM)   92 - 97   2021年7月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ACM  

    DOI: 10.1145/3479162.3479176

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    その他リンク: https://dblp.uni-trier.de/db/conf/icccm/icccm2021.html#HtetFKZK21

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

    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年7月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:SPRINGER INTERNATIONAL PUBLISHING AG  

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

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

    International Conference on Computer Communication and the Internet (ICCCI)   136 - 140   2021年6月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

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

    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年6月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)  

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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. 査読

    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年5月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)  

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    その他リンク: https://dblp.uni-trier.de/db/journals/ieicetd/ieicetd104.html#MuneneFBRAKK21

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

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

    SN Computer Science   2 ( 3 )   172 - 172   2021年5月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    DOI: 10.1007/s42979-021-00580-1

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    その他リンク: http://link.springer.com/article/10.1007/s42979-021-00580-1/fulltext.html

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

    Su Sandy Wint, Nobuo Funabiki

    International Journal of Web Information Systems   17 ( 2 )   140 - 152   2021年4月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Emerald  

    <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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    その他リンク: https://www.emerald.com/insight/content/doi/10.1108/IJWIS-11-2020-0070/full/html

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

    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年3月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

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

    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年3月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    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 査読

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

    International Conference on Information and Education Technology (ICIET 2021)   6 - 13   2021年3月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

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

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

    Blending Android programming learning assistance system into online Android programming course   26 - 33   2021年3月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

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

    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年3月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/LifeTech52111.2021.9391784

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    その他リンク: https://dblp.uni-trier.de/db/conf/lifetech/lifetech2021.html#LuFKAD21

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

    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年3月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/LifeTech52111.2021.9391812

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    その他リンク: https://dblp.uni-trier.de/db/conf/lifetech/lifetech2021.html#LuAKFAS21

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

    Ariel Kamoyedji, Nobuo Funabiki, Hein Htet, Minoru Kuribayashi

    International Conference on Information and Education Technology (ICIET 2021)   374 - 379   2021年3月

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

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

    Htoo Htoo, Sandi Kyaw, Nobuo Funabiki, Minoru Kuribayashi

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

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

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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年

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)  

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    その他リンク: https://dblp.uni-trier.de/db/journals/ijnc/ijnc11.html#BriantoroFRMKK21

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

    Minoru Kuribayashi, Tatsuya Yasui, Asad Malik, Nobuo Funabiki

    CoRR   abs/2107.02961   2021年

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    掲載種別:研究論文(学術雑誌)  

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    その他リンク: https://dblp.uni-trier.de/db/journals/corr/corr2107.html#abs-2107-02961

  • 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年

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/LifeTech52111.2021.9391894

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    その他リンク: https://dblp.uni-trier.de/db/conf/lifetech/lifetech2021.html#KyawFK21

  • 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年

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ACM  

    DOI: 10.1145/3437880.3460402

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    その他リンク: https://dblp.uni-trier.de/db/conf/ih/ihmmsec2021.html#KuribayashiTSYF21

  • 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年

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

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    その他リンク: https://dblp.uni-trier.de/rec/conf/apsipa/2021

  • 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年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    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 査読

    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年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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

    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年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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

    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年12月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)  

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

    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年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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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年11月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    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. 査読

    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年10月

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    担当区分:筆頭著者   掲載種別:研究論文(学術雑誌)  

    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 査読

    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年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • A Study of Throughput-Drop Estimation Model for Concurrently Communicating Two Links without Channel Bonding in IEEE 802.11n Wireless Local-Area Network

    Ismael Munene Kwenga, Nobuo Funabiki, Rahardhita Widyatra Sudibyo, Hendy Briantoro, Md. Mahbubur Rahman, Wen-Chung Kao

    2020 IEEE International Conference on Consumer Electronics - Taiwan, ICCE-Taiwan 2020   2020年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Institute of Electrical and Electronics Engineers Inc.  

    Nowadays, IEEE802.11n wireless local-area networks (WLANs) have been widely deployed due to its high-speed data transmission. The channel bonding is one of the key technologies to realize it. However, the data transmission throughput can be dropped when nearby multiple links are concurrently communicating, caused by interference. Previously, we have studied the throughput-drop estimation model for the links using the channel bonding, which considers the channel distance and the received signal strength (RSS) of the interfered links. In this paper, we further explore the throughput-drop estimation model for concurrently communicating two links without the channel bonding by extending the previous model. The effectiveness of the proposal is confirmed through experiments where the estimated throughput well matches the measured throughput.

    DOI: 10.1109/ICCE-Taiwan49838.2020.9258012

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  • A Proposal of code amendment problem in Java programming learning assistant system 査読

    Htoo Htoo Sandi Kyaw, Nobuo Funabiki, and Wen-Chung Kao

    International Journal of Information and Education Technology   10 ( 10 )   751 - 756   2020年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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

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

    IAENG International Journal of Computer Science   47 ( 3 )   350 - 359   2020年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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

    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年5月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)  

    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 査読

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

    International Journal of Mobile Computing and Multimedia Communications (IJMCMC)   11 ( 2 )   18 - 40   2020年4月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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 査読

    Yan Watequlis Syaifudin, Nobuo Funabiki, Minoru Kuribayashi

    ICIET 2020: 2020 8TH INTERNATIONAL CONFERENCE ON INFORMATION AND EDUCATION TECHNOLOGY   88 - 93   2020年3月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ASSOC COMPUTING MACHINERY  

    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 査読

    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年3月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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

    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年3月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • The Performance of a Metaheuristic Algorithm for Finding a Maximal Weight Clique in the Fill-in-Blank Problem

    Kazuho Kanahara, Kengo Katayama, Nobuo Funabiki, Etsuji Tomita

    PervasiveHealth: Pervasive Computing Technologies for Healthcare   257 - 261   2020年3月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ICST  

    A programming education is one of the most important fields in Information and Education Technology. Funabiki et al. have developed a Web-based Java Programming Learning Assistant System (JPLAS). JPLAS mainly provides two types of problems, namely the code writing problem and the fill-in-blank problem, to support students' self-studies at various learning levels. Particularly in the fill-in-blank problem (FIBP), the system requires an efficient algorithm to find a maximal clique of the compatibility graph in advance in order to obtain a maximal set of blank elements with unique answers. In this paper, we investigate the performance of a metaheuristic algorithm based on an iterated local search for solving the maximum weight clique problem (MWCP), which is an important generalization of the maximum clique problem, given as an extension of the compatibility graph in the FIBP. Computational results show that our metaheuristic algorithm is capable of finding satisfactory weighted cliques efficiently for well-known benchmark graphs and the performance of our algorithm is comparable to those of state-of-the-art metaheuristics for the MWCP.

    DOI: 10.1145/3395245.3396407

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

    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年1月

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  • Application of IEEE802.11ac/n link throughput estimation model in holding access-point assignment algorithm for wireless local-area network

    Shigeto Tajima, Nobuo Funabiki, Teruo Higashino

    Journal of Communications   15 ( 1 )   81 - 87   2020年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Engineering and Technology Publishing  

    Currently, various types of access-points (APs) and hosts can be used in IEEE802.11n/ac wireless local-area networks (WLANs). Previously, we have studied the holding AP assignment algorithm to find an optimal assignment of the holding APs into the network field. Here, the 11n link throughput is obtained by using simple equations, and the 11ac link throughput is obtained by multiplying it with a constant value larger than 1, assuming the former link is faster than the latter one. Unfortunately, our experiments found that the 11ac link throughput is more quickly decreased as the link distance increases than the 11n. Thus, our algorithm may produce incorrect solutions in some cases. In this paper, we adopt the throughput estimation model for the 11ac/n link as the accurate estimation method in the holding AP assignment algorithm, and confirm the effectiveness of improving the total throughput performance through simulations in three instances using the WIMNET simulator.

    DOI: 10.12720/jcm.15.1.81-87

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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年

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

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    その他リンク: https://dblp.uni-trier.de/conf/apsipa/2020

  • 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年

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

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    その他リンク: https://dblp.uni-trier.de/conf/apsipa/2020

  • A generalization of transmission power optimization method for concurrently communicating multiple access-points in wireless local-area network 査読

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

    Proceedings of 13th International Workshop on Autonomous Self-Organizing Networks (ASON 2020)   1 - 7   2020年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/CANDARW51189.2020.00015

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

    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年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Springer  

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

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    その他リンク: https://dblp.uni-trier.de/db/conf/bwcca/bwcca2020.html#HudaFKSIK20

  • 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年

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

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    その他リンク: https://dblp.uni-trier.de/conf/apsipa/2020

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

    Tatsuya Yasui, Minoru Kuribayashi, Nobuo Funabiki, Isao Echizen

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

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers ({IEEE})  

    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. 査読

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

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

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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 査読

    Nobuo Funabiki, Shinpei Matsumoto, Su Sandy Wint, Minoru Kuribayashi, and Wen-Chung Kao

    Proceedings of The 22-nd International Conference on Network-Based Information Systems (NBiS-2019)   1036   247 - 257   2020年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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年

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/CANDARW51189.2020.00066

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    その他リンク: https://dblp.uni-trier.de/db/conf/ic-nc/candar2020w.html#AkhterTNKF20

  • 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年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    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年

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/CANDARW51189.2020.00093

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

    Nobuo Funabiki, Sai He, Htoo Htoo Sandi Kyaw, Wen-Chun Kao

    Advances in Intelligent Systems and Computing   993   671 - 680   2020年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Springer Verlag  

    To advance Java programming educations, we have developed a Web-based Java Programming Learning Assistant System (JPLAS). JPLAS offers several types of programming exercises to cover various learning stages of Java programming, where any answer can be marked automatically on the server. The code writing problem requests a student to write a source code satisfying the specifications described in the test code, such as names and data types of classes, methods, and variables, so that the answer code is marked by running the test code on JUnit. However, it appears challenging for a novice student to extract the specifications from the test code properly. In this paper, we propose a code correction problem as a new type programming exercise for reading and debugging codes, which gives a source code with errors called a problem code with the corresponding test code, and requests students to correct the problem code to pass the test code. We also propose the error generation algorithm to generate the problem code from a sample source code automatically. We verify the effectiveness of our proposal through applications of seven assignments of the code correction problem to 45 students in the Java programing class in Okayama University.

    DOI: 10.1007/978-3-030-22354-0_60

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

    Aye Myint Myat, Khine Khine Htwe, and Nobuo Funabiki

    Proceedings of The 3rd International Conference on Advanced Information Technologies (ICAIT2019)   244 - 249   2019年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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

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

    Proceedings of The 3rd International Conference on Advanced Information Technologies (ICAIT2019)   137 - 142   2019年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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

    Irin Tri Anggraini, Achmad Basuki, and Nobuo Funabiki

    Proceedings of 2019 International Electronics Symposium (IES)   14 - 18   2019年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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

    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年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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

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

    Internet of Things   8   1 - 15   2019年8月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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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 査読

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

    IAENG International Journal of Computer Science   46 ( 3 )   445 - 453   2019年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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

    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年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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

    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年5月

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

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

    2019 IEEE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS - TAIWAN (ICCE-TW)   2019年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    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 査読

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

    International Journal of Computer & Software Engineering   4   2019年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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

    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年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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

    International Journal of Space-Based and Situated Computing (IJSSC)   9 ( 1 )   47 - 59   2019年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1504/IJSSC.2019.100017

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  • A proposal of Android programming learning assistant system with implementation of basic application learning 査読

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

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

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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 査読

    Kwenga Ismael Munene, Nobuo Funabiki, Md. Manowarul Islam, Minoru Kuribayashi, Md. Selim Al Mamun, and Wen-Chung Kao

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

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.25046/aj040411

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

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

    Proceedings of 2019 2nd International Conference on Communication Engineering and Technology (ICCET 2019)   4 ( 6 )   76 - 80   2019年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.25046/aj040602

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

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

    International Journal of Web Information Systems   1 - 2   2019年

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE  

    DOI: 10.1108/IJWIS-07-2019-0032

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  • Robust and secure data hiding for PDF text document 査読

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

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

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    掲載種別:研究論文(学術雑誌)  

    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 査読

    Mousumi Saha, Rahardhita Widyatra Sudibyo, Nobuo Funabiki, Minoru Kuribayashi, and Wen-Chung Kao

    Journal of Communications (JCM)   14 ( 11 )   1009 - 1009   2019年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.12720/jcm.14.11.1009-1016

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  • Decentralized tracing protocol for fingerprinting system 査読

    Kuribayashi, M., Funabiki, N.

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

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE  

    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 査読

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

    Journal of Software   14 ( 5 )   200 - 208   2019年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.17706/jsw.14.5.200-208

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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

    Advances in Intelligent Systems and Computing   772   855 - 864   2019年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Springer Verlag  

    To enhance Java programming educations in schools, we have developed a Web-based Java Programming Learning Assistant System (JPLAS) that provides a variety of programming assignments to cover different learning stages. For the first stage, JPLAS offers the element fill-in-blank problem where students study the grammar and code reading through filling the blank elements, composed of reserved words, identifiers, and control symbols, in a high-quality code. Unfortunately, it has been observed that students can fill the blanks without reading the code carefully, because the choice is limited for each blank. In this paper, we propose a code completion problem as a generalization of the element fill-in-blank problem. To solve the drawback, it does not explicitly show blank locations in the code, which expects students to carefully read the code to understand the grammar and code structure. The correctness of the answer is verified through string matching of each statement with the filled elements and the corresponding correct one. Besides, to encourage students to study readable code writing, the correct statement satisfies the coding rules including the spaces. For evaluations, we generated six code completion and element fill-in-blank problems respectively, and asked ten students in two universities to solve them. Their solution results show that the code completion problem is much harder than the element fill-in-blank problem, and requires far deeper code reading and understanding of coding rules.

    DOI: 10.1007/978-3-319-93659-8_78

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  • 射影写像を用いた書道学習支援システムの提案 査読

    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年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Error debugging problem in Java Programming learning assistant system 査読

    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年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Implementation of integration VaaMSN and SEMAR for wide coverage air quality monitoring

    Yohanes Yohanie Fridelin Panduman, Adnan Rachmat Anom Besari, Sritrusta Sukaridhoto, Rizqi Putri Nourma Budiarti, Rahardhita Widyatra Sudibyo, Funabiki Nobuo

    Telkomnika (Telecommunication Computing Electronics and Control)   16 ( 6 )   2630 - 2642   2018年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Universitas Ahmad Dahlan  

    The current air quality monitoring system cannot cover a large area, not real-time and has not implemented big data analysis technology with high accuracy. The purpose of an integration Mobile Sensor Network and Internet of Things system is to build air quality monitoring system that able to monitor in wide coverage. This system consists of Vehicle as a Mobile Sensors Network (VaaMSN) as edge computing and Smart Environment Monitoring and Analytic in Real-time (SEMAR) cloud computing. VaaMSN is a package of air quality sensor, GPS, 4G Wi-Fi modem and single board computing. SEMAR cloud computing has a time-series database for real-time visualization, Big Data environment and analytics use the Support Vector Machines (SVM) and Decision Tree (DT) algorithm. The output from the system are maps, table, and graph visualization. The evaluation obtained from the experimental results shows that the accuracy of both algorithms reaches more than 90%. However, Mean Square Error (MSE) value of SVM algorithm about 0.03076293, but DT algorithm has 10x smaller MSE value than SVM algorithm.

    DOI: 10.12928/TELKOMNIKA.v16i6.10152

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

    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年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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

    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年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    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 査読

    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年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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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 査読

    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年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • IoT-Based vehicle anti-theft tracking system 査読

    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年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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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 査読

    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年10月

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

    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年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Fingerprinting for multimedia content broadcasting system 査読

    Kuribayashi, M., Funabiki, N.

    Journal of Information Security and Applications   41   52 - 61   2018年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.jisa.2018.06.002

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

    Kuribayashi, M., Funabiki, N.

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

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1587/transfun.E101.A.119

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  • Data hiding for text document in PDF file 査読

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

    Smart Innovation, Systems and Technologies   81   390 - 398   2018年

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Smart Innovation, Systems and Technologies  

    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 査読

    International Journal of Space-Based and Situated Computing (IJSSC)   8 ( 3 )   123 - 137   2018年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1504/IJSSC.2018.097286

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  • Efficient Decoding Algorithm for Cyclically Permutable Code. 査読

    Minoru Kuribayashi, Shodai Suma, Nobuo Funabiki

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

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    出版者・発行元:IEEE  

    DOI: 10.1109/ITW.2018.8613319

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

    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年

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    掲載種別:研究論文(学術雑誌)  

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

    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年

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  • Watermarking with Fixed Decoder for Aesthetic 2D Barcode 査読

    Minoru Kuribayashi, Ee-Chien Chang, Nobuo Funabiki

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

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:SPRINGER INTERNATIONAL PUBLISHING AG  

    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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  • A workbook design for fill-in-blank problems in java programming learning assistant system

    Nobuo Funabiki, Minako Dake, Khin Khin Zaw, Wen-Chung Kao

    Lecture Notes on Data Engineering and Communications Technologies   2   331 - 342   2017年

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    記述言語:英語   掲載種別:論文集(書籍)内論文   出版者・発行元:Springer Science and Business Media Deutschland GmbH  

    To advance Java programming educations, we have developed a Java Programming Learning Assistant System (JPLAS) as a Web application system. JPLAS provides fill-in-blank problems for novice students to study the grammar and basic programming skills through code reading. To select the blank elements with grammatically correct and unique answers from a given code, we have proposed the graph-based blank element selection algorithm. Then, we generated and assigned fill-in-blank problems to students in Java programming course for two years. Unfortunately, the teacher selected original Java codes rather arbitrarily, which may degrade educational effects. Besides, this algorithm has been continuously extended to enhance the variations of generated problems. In this paper, we present a workbook design for fill-in-blank problems in JPLAS by collecting suitable Java codes from textbooks and Web sites, and applying the extended algorithm, so that they can be instantly and properly assigned to students. This workbook design consists of 15 categories with a considerable number of problems that follow the conventional learning order of Java programming. For the preliminary evaluation, we assign some problems to novice students. In the coming semester, we will use this workbook in the course to verify the adequacy of our proposal for novice students.

    DOI: 10.1007/978-3-319-49106-6_31

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

    Md Ezharul Islam, Nobuo Funabiki

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

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

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

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

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

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    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 査読

    Shahidatul Sadiah, Toru Nakanishi, Nobuo Funabiki

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

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:SPRINGER-VERLAG BERLIN  

    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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  • Revocable Group Signatures with Compact Revocation List Using Accumulators 査読

    Toru Nakanishi, Nobuo Funabiki

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

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:SPRINGER INT PUBLISHING AG  

    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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  • An Anonymous Reputation System with Reputation Secrecy for Manager 査読

    Toru Nakanishi, Tomoya Nomura, Nobuo Funabiki

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

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:SPRINGER INT PUBLISHING AG  

    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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  • 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年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    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年12月

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    掲載種別:論文集(書籍)内論文   出版者・発行元:Springer Netherlands  

    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 査読

    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年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    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 査読

    Nobuo Funabiki, Yukiko Matsushima

    Lecture Notes in Electrical Engineering   110   123 - 136   2012年

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    記述言語:英語   出版者・発行元:Springer New York  

    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. 査読

    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年

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    出版者・発行元:IEEE  

    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年

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    記述言語:英語   出版者・発行元:Information and Media Technologies 編集運営会議  

    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 査読

    Amang Sudarsono, Toru Nakanishi, Yasuyuki Nogami, Nobuo Funabiki

    Journal of Information Processing   18   63 - 76   2010年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Information Processing Society of Japan  

    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 査読

    Nobuo Funabiki, Yosuke Isshiki, Megumi Isogai, Toru Nakanishi,

    The 13th IEEE International Symposium on Consumer Electronics (ISCE2009)   894 - 898   2009年

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/ISCE.2009.5156917

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

    Sritrusta Sukaridhoto, Nobuo Funabiki, Toru Nakanishi, Dadet Pramadihanto

    The 13th IEEE International Symposium on Consumer Electronics (ISCE2009)   577 - 581   2009年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/ISCE.2009.5156885

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  • Efficient revocable group signature schemes using primes 査読

    Toru Nakanishi, Nobuo Funabiki

    Journal of Information Processing   16   110 - 121   2008年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Information Processing Society of Japan  

    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年

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    記述言語:英語   出版者・発行元:Information and Media Technologies 編集運営会議  

    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 査読

    Toru Nakanishi, Nobuo Funabiki

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

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    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 査読

    KITANI T.

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

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Springer-Verlag  

    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 査読

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

    Systems and Computers in Japan   38 ( 5 )   80 - 88   2007年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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 査読

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

    Systems and Computers in Japan   38 ( 4 )   74 - 83   2007年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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 査読

    Nobuo Funabiki, Toru Nakanishi, Walaa Hassan, Kanako Uemura

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

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    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 査読

    Toru Nakanishi and *Nobuo Funabiki

    IEICE Transactions on Fundamentals   E89A ( 5 )   1275 - 1283   2006年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1093/ietfec/e89-a.5.1275

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

    Toru Nakanishi, Nobuo Funabiki

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

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER-VERLAG BERLIN  

    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 査読

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

    IEICE Transactions on Fundamentals   E88-A ( 5 )   1234 - 1240   2005年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1093/ietfec/e88-a.5.1234

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

    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年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    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 査読

    Tomoya Kitani, *Nobuo Funabiki, and Teruo Higashino

    Proc. of 2004 International Conference on Networks (ICON-2004)   2   605 - 609   2004年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/ICON.2004.1409241

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

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

    Systems and Computers in Japan   34 ( 11 )   20 - 29   2003年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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 査読

    T Baba, N Funabiki, S Tajima

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

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元: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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  • An optimal path selection algorithm for static and mobile multicast routing problems

    Shigeto Tajima, Masakazu Fujii, Nobuo Funabiki, Tokumi Yokohira, Kazufumi Tsunemura, Teruo Higashino

    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)   2343   193 - 202   2002年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Springer Verlag  

    In this paper, we present a new 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 source node, a destination node set, and a delay time limit, the first problem requires finding a multicast tree such that the total cost is not only minimized, but also the delay along any path from the source to a destination does not exceed its limit. OPSAM first extracts plural path candidates for each destination to satisfy the delay constraint simultaneously. Then, it iteratively selects better paths among candidates for finding a low-cost tree within a short computation time. The performance of OPSAM is verified through simulations in Waxman model and 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 to follow changes of mobile user locations, such that the sum of total tree costs and the difference between two consecutive trees is minimized. The simulation results show the performance of OPSAM is better than BSMA.

    DOI: 10.1007/3-540-45803-4_18

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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年9月

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

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

    Proc. of IEEE International Conference on Systems, Man, and Cybernetics   4   2769 - 2774   2001年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1109/ICSMC.2001.972986

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

    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年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Scripta Technica Inc  

    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 査読

    T Baba, N Funabiki, S Nishikawa

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

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SCRIPTA TECHNICA-JOHN WILEY & SONS  

    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 Binary Neural Network Algorithm for the Graph Partitioning Problem

    Yasuhiro Tamaki, Nobuo Funabiki, Seishi Nishikawa

    Electronics and Communications in Japan, Part III: Fundamental Electronic Science (English translation of Denshi Tsushin Gakkai Ronbunshi)   82 ( 12 )   34 - 42   1999年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:John Wiley and Sons Inc.  

    The graph partitioning problem is an NP hard problem of deriving the partitioning of each vertex such that the total stun of the edge weights among the groups is minimized and the total sum of the vertex weights in each group is less than the upper limit. In this paper, a neural network solution is proposed in which the binary neurons are used for the graph 2-partitioning problem. In the present neural network, an energy function that is applicable to graphs both with and without edge and vertex weights is defined. For improvement of solution accuracy, shaking terms are introduced into the operating equation. To evaluate the solution search capability of the present method, simulations are carried out for random graphs, together with the KL method proposed by Kernighan and Lin, and the FM method proposed by Fiduccia and Mattheyses. From the simulation results, it is shown that the solutions obtained by the present method are the best. © 1999 Scripta Technica.

    DOI: 10.1002/(sici)1520-6440(199912)82:12<34::aid-ecjc4>3.0.co;2-5

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  • Proposal of an N-parallel computation method for a neural network for the N queens problem

    Hiroaki Yoshio, Takayuki Baba, Nobuo Funabiki, Seishi Nishikawa

    Electronics and Communications in Japan, Part III: Fundamental Electronic Science (English translation of Denshi Tsushin Gakkai Ronbunshi)   80 ( 11 )   12 - 20   1997年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Scripta Technica Inc  

    This paper presents an N2 neuron N-parallel computation method for a neural network for the N queens problem. In this method, the N2 neurons are partitioned into N groups of N neurons, where the states of N neurons in N different groups are updated synchronously and the states in the same group are updated sequentially. First, we compare the performance of two existing neural networks for the N queens problem in order to show that Takefuji's neural network is best in the sequential method. Then, we show that even the improved neural network using the N2-parallel method cannot provide the same performance as that using the using sequential method. Lastly, we propose an N-parallel method to achieve high performance and parallel computation simultaneously.

    DOI: 10.1002/(SICI)1520-6440(199711)80:11<12::AID-ECJC2>3.0.CO;2-U

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  • A maximum neural network approach for N-queens problems

    FUNABIKI N.

    Biol Cybern   76   251 - 255   1997年6月

  • An evolutionary neural network algorithm for max cut problems

    N. Funabiki, J. Kitamichi, S. Nishikawa

    IEEE International Conference on Neural Networks - Conference Proceedings   2   1260 - 1265   1997年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    An «evolutionary neural network (ENN)» is presented for the max cut problem of an undirected graph G(V, E) in this paper. The goal of the NP-hard problem is to find a partition of V into two disjoint subsets such that the cut size be maximized. The cut size is the sum of weights on edges in E whose endpoints belong to different subsets. The ENN combines the evolutionary initialization scheme of the neural state into the energy minimization criteria of the binary neural network. The performance of ENN is evaluated through simulations in randomly weighted complete graphs and unweighted random graphs with up to 1000 vertices. The results show that the evolutionary initialization scheme drastically improves the solution quality. ENN can always find better solutions than the maximum neural network, the mean field annealing, the simulated annealing, and the greedy algorithm. © 1997 IEEE.

    DOI: 10.1109/ICNN.1997.616215

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  • マキシマムニューロンを用いたN - Queen問題のニューラルネット解法の提案

    竹中 要一, 船曳 信生, 西川 清史

    情報処理学会論文誌   37 ( 10 )   1781 - 1788   1996年10月

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    記述言語:日本語   出版者・発行元:一般社団法人情報処理学会  

    本論文では マキシマムニューロンを用いたN-Queen問題の解法を提案する. マキシマムニューロンは ニューラルネットワークによる組合せ最適化問題の効率的解法を目的として Takefujiらによって提案されたニューロンモデルである. マキシマムニューロンでは 解空間を構成するニューロンをグループに分割し 各グループ内でただ1つのニューロンのみが発火する. これにより 探索空間の大幅な縮小 ニューロン状態更新に必要な計算量の減少を実現している. 本論文では シミュレーションにより マキシマムニューロンによる解法が 従来のニューラルネットワーク解法より優れた求解性能を有することを示す. 特に 本解法が準同期式並列計算に非常に適した方法であることを明らかにする.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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    その他リンク: http://id.nii.ac.jp/1001/00013567/

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

    N Funabiki, S Nishikawa

    IEICE TRANSACTIONS ON COMMUNICATIONS   E79B ( 8 )   1086 - 1093   1996年8月

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    記述言語:英語   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    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年

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    記述言語:英語  

    &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年

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    記述言語:英語  

    &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年

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    記述言語:英語  

    &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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▼全件表示

書籍等出版物

  • 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( 担当: 分担執筆)

    World Scientific Publishing  2018年1月 

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  • ICTプロフェッショナル概論

    岡山大学出版会  2013年 

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  • グラフ理論の基礎と応用

    共立出版  2012年 

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  • Intelligent control and innovative computing

    Springer  2012年 

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  • Wireless Mesh Networks

    InTech - Open Access Publisher  2011年 

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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年 

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  • Soft computing in communications

    Springer  2004年 

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MISC

  • パッチ型敵対的ノイズ生成手法における3Dモデルの適用の一考察

    瀧脇大登, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告(Web)   123 ( 332(EMM2023 80-88) )   2024年

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  • JPEG圧縮由来の歪み信号に基づくフィルタリングを活用した敵対的事例検出手法

    角森健太, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告(Web)   123 ( 332(EMM2023 80-88) )   2024年

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  • C言語によるTCP/IPプログラミング学習のための2種類の演習問題の提案

    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年

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  • SEMAR IoTアプリケーションサーバプラットフォームにおけるエッジデバイスフレームワークの概要【JST・京大機械翻訳】

    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年

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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でのIEEE802.11axプロトコル利用の検討

    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年

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  • IEEE 802.11ac WLANにおける2リンク同時通信のための非チャネル結合によるスループットドロップ推定モデル【JST・京大機械翻訳】

    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年

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  • ノードベースJavaプログラミング学習支援システムプラットフォームのための応答インタフェースファイルジェネレータの拡張【JST・京大機械翻訳】

    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年

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  • 無線ローカルエリアネットワークにおける同時通信3アクセスポイントのためのスループット推定モデルを用いたインタフェイスセットアップ最適化法の実験的検証【JST・京大機械翻訳】

    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年

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  • ユーザPC計算システムにおける複数CPU時間を持つ一様ジョブへの静的作業者割当アルゴリズムの拡張【JST・京大機械翻訳】

    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年

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  • システム設計学習のためのフローチャート理解問題(FUP)の提案【JST・京大機械翻訳】

    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年

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  • クライアントサイドWebプログラミング学習システムにおける単体テストツールの設計と実装

    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年

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  • NS-3ネットワークシミュレーションのためのユーザPCコンピューティングシステムの拡張

    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年

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  • MEANアーキテクチャを用いたWebアプリケーション開発のための文法概念理解問題の研究

    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年

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  • Dockerを用いたユーザPCコンピューティングシステムによる無線マルチホップネットワークシミュレーションの効率的実行

    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年

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  • Cプログラミングのための自動テストデータ生成法の研究【JST・京大機械翻訳】

    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年

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  • デザインQRコード作成のためのWebアプリケーション開発

    山崎裕真, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告(Web)   122 ( 337(ICM2022 31-43) )   2023年

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  • 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, 浜崎和志, 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(Web)   122 ( 329(MSS2022 44-61) )   2023年

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  • プライバシ保護に向けたOpenPose骨格推定を用いた人の頭部位置検出

    瀬尾亮太, 田中千奈月, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告(Web)   122 ( 412(EMM2022 67-92) )   2023年

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  • Federated Learningにおいて悪意のある分散ノードを除外するための一検討

    赤井怜音, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告(Web)   122 ( 412(EMM2022 67-92) )   2023年

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  • 空調ガイダンスシステムにおける室内の温度および気流分布の予測

    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年

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  • 無線ローカルエリアネットワークにおける3アクセスポイントを同時通信するためのスループット推定モデルを用いたインタフェース設定最適化手法の実現可能性研究

    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年

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  • 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

    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年

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  • 敵対的ノイズとJPEG圧縮由来の歪みの相関を用いた敵対的事例検出の研究

    角森健太, 山崎裕真, 栗林稔, 舩曵信生, 越前功

    電子情報通信学会技術研究報告(Web)   122 ( 25(IT2022 1-14) )   2022年

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  • 顔識別回避のためのパッチ型敵対的事例の生成及び堅牢性の検証

    瀧脇大登, 栗林稔, 舩曵信生

    電子情報通信学会技術研究報告(Web)   122 ( 25(IT2022 1-14) )   2022年

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  • 埋め込みロス関数なしのDNN電子透かしの収束に関する考察

    田中 拓朗, 安井 達哉, 栗林 稔, 舩曵 信生

    51 ( 7 )   393 - 398   2021年11月

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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年5月

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    担当区分:責任著者   掲載種別:研究発表ペーパー・要旨(全国大会,その他学術会議)  

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  • 監視カメラにおける映り込み領域に対する顔検出とプライバシ保護に関する考察

    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年

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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 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年

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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

    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年

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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, 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年

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  • DCT係数の統計的な偏り観測における二重JPEG圧縮履歴解析に適した特徴成分選出に関する考察

    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年

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  • 複数のAuto Encoderに対する応答特性を用いた敵対的事例の検出法

    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年

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  • 複数のフィルタ強度によるCNN画像分類器の応答特性を用いた敵対的事例の検出法

    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年

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  • 埋め込みロス関数なしのDNN電子透かしの収束に関する考察

    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(Web)   121 ( 246(EA2021 27-56) )   2021年

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  • ポスター講演 ブロックサイズの違いがDCT係数の頻度分布を利用したJPEG画像圧縮履歴解析に与える影響

    中嶋 直也, 栗林 稔, 舩曵 信生

    50 ( 6 )   337 - 342   2020年11月

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  • DM-QIMによるDNNモデルの全結合層に対する電子透かし法 (メディア工学)

    田中 拓朗, 栗林 稔, 舩曵 信生

    44 ( 18 )   21 - 26   2020年9月

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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

    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年

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  • DM-QIMによるディープニューラルネットワークの重みに対する電子透かし法

    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年

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  • DCT係数のヒストグラムを利用したJPEG画像のCNNに基づく編集履歴解析

    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年

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  • ビデオカメラを用いたディスプレイ再撮により作成された違法動画の検出法

    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年

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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

    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年

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  • DM-QIMによるDNNモデルの全結合層に対する電子透かし法

    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年

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  • 非可逆圧縮の圧縮率の変化に伴う挙動解析に基づく敵対的事例の検知法

    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年

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  • ブロックサイズの違いがDCT係数の頻度分布を利用したJPEG画像圧縮履歴解析に与える影響

    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年

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  • 誤ったメッセージを避けるための屋外不快指数を用いたエアコンディショニングガイダンスシステムの改善

    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年

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  • 投影マッピングを用いた文字部分実行機能を持つ書道学習支援システム【JST・京大機械翻訳】

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

    IEEE Conference Proceedings   2020 ( ICCE )   2020年

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  • Raspberry Piを用いた空調機使用警報システムの提案【JST・京大機械翻訳】

    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年

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  • 電子指紋符号の結託攻撃パラメータ推定のための特徴ベクトル導出及びその次元削減

    安井 達哉, 栗林 稔, 舩曵 信生

    ( 2019 )   982 - 989   2019年10月

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    記述言語:日本語  

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  • JPEG圧縮による画像分類器の識別結果の変動解析に基づく敵対的事例の検知法

    東 亮憲, 栗林 稔, 舩曵 信生, Huy H. Nguyen, 越前 功

    ( 2019 )   975 - 981   2019年10月

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    記述言語:日本語  

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  • DCT係数のヒストグラムの偏りを利用したJPEG画像の編集履歴解析

    小浦 啓太郎, 栗林 稔, 舩曵 信生

    ( 2019 )   969 - 974   2019年10月

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    記述言語:日本語  

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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

    情報処理学会論文誌プログラミング(PRO)   12 ( 3 )   17 - 17   2019年7月

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    記述言語:日本語  

    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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  • 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

    情報処理学会論文誌プログラミング(PRO)   12 ( 3 )   16 - 16   2019年7月

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    記述言語:日本語  

    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年

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  • 雑音環境における電子指紋符号に対する結託攻撃の攻撃戦略推定

    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年

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  • CNNを用いたCGと写真を識別するためのパッチサイズの考察

    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年

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  • プロジェクションマッピングを用いた習字学習支援システムの文字位置実習機能の実装

    HUDA Samsul, FUNABIKI Nobuo, KURIBAYASHI Minoru

    情報科学技術フォーラム講演論文集   18th   2019年

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  • プロジェクションマッピングを用いた書道学習支援システムの評価

    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年

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  • 組織内の情報漏洩を抑止するための電子指紋システムの実装評価

    上田 貴大, 栗林 稔, 舩曵 信生

    48 ( 7 )   661 - 666   2018年11月

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  • PDF文書に対する電子指紋システムへの適用を考慮した行セグメント分割埋め込み法

    福島 拓哉, 栗林 稔, 舩曵 信生

    48 ( 7 )   655 - 660   2018年11月

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  • 電子指紋符号における不正者検出のための動的戦略推定 (メディア工学)

    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年9月

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    記述言語:日本語   出版者・発行元:映像情報メディア学会  

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  • Cyclically Permutable Codeの同期回復と誤り訂正に関する考察

    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年5月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • 画像の局所的な特徴を考慮したデザインQRコードに関する考察

    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年5月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • 電子指紋符号における結託攻撃の戦略推定

    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年3月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • 量子化テーブルの特徴を考慮したJPEG圧縮履歴の解析

    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年3月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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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年1月

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    記述言語:英語   出版者・発行元:電子情報通信学会  

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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 (ソフトウェアサイエンス)

    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年1月

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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 (システム数理と応用)

    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年1月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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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 (ソフトウェアサイエンス)

    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年1月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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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年

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    その他リンク: https://astesj.com/v03/i01/p05/

  • 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年

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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年

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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年

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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年

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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年

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    記述言語:英語  

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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年

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  • 組織内の情報漏洩を抑止するための電子指紋システムの実装評価

    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年

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  • PDF文書に対する電子指紋システムへの適用を考慮した行セグメント分割埋め込み法

    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年

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  • 電子指紋符号における不正者検出のための動的戦略推定

    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年

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

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

    Proceedings of 6th IEEE Global Conference on Consumer Electronics (GCCE2017)   2017-   1 - 2   2017年12月

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    担当区分:筆頭著者   記述言語:英語  

    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, and Teruo Higashino

    9th IEEE International Conference on Communication Software and Networks (ICCSN 2017)   2017-   367 - 371   2017年12月

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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年12月

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    担当区分:筆頭著者   記述言語:英語  

    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年11月

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    記述言語:英語   出版者・発行元:電子情報通信学会  

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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) 査読

    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年11月

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    記述言語:英語   出版者・発行元:電子情報通信学会  

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  • 誤り訂正符号を用いたDCT-OFDM型電子透かし方式の耐性向上に関する考察

    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年11月

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  • 電子透かし方式の安全性を高めるための難読化処理に関する考察

    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年11月

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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 (ディペンダブルコンピューティング)

    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年10月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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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年10月

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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年10月

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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年7月

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    記述言語:英語   出版者・発行元:Graphy Publications  

    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, and Wen-Chung Kao

    2017 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW 2017)   241 - 242   2017年7月

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    担当区分:筆頭著者   記述言語:英語  

    DOI: 10.1109/ICCE-China.2017.7991085

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  • PDFファイルの内部構造を考慮した大容量電子透かし法

    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年5月

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  • 組織内からの情報漏洩対策のための電子指紋システムの提案

    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年5月

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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年4月

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    担当区分:筆頭著者   記述言語:英語  

    DOI: 10.1587/transfun.E100.A.944

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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部分干渉チャネルの考慮 (ネットワークシステム)

    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 = IEICE technical report : 信学技報   116 ( 484 )   457 - 462   2017年3月

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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年2月

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    記述言語:英語   出版者・発行元:Springer New York LLC  

    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-Wei Lai, Nobuo Funabiki, Shigeto Tajima, Md. Selim Al Mamun, and Sho Fujita

    Wireless Networks   1 - 13   2017年2月

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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 (システム数理と応用)

    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年1月

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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

    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年1月

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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年

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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年

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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年

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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年

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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年

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    DOI: 10.1109/CANDAR.2017.20

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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年

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    記述言語:英語   出版者・発行元:IJNC編集委員会  

    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年

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    記述言語:英語   出版者・発行元:IJNC編集委員会  

    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年

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    記述言語:英語   出版者・発行元:Emerald Group Publishing Ltd.  

    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 software architecture for Java programming learning assistant system

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

    International Journal of Computer & Software Engineering   2 ( 1 )   64 - 70   2017年

  • 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年

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  • A fill-in-blank problem workbook for Java programming learning assistant system

    Tana, Nobuo Funabiki, Khin Khin Zaw, Nobuya Ishihara, Shinpei Matsumoto, and Wen-Chung Kao

    International Journal of Web Information Systems   13 ( 2 )   140 - 154   2017年

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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年

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    担当区分:筆頭著者   記述言語:英語  

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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年

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  • A proposal of software architecture for Java programming learning assistant system

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

    The 31st IEEE International Conference on Advanced Information Networking and Applications (AINA-2017)   64 - 70   2017年

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  • A proposal of test code generation tool for Java programming learning assistant system

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

    The 31st IEEE International Conference on Advanced Information Networking and Applications (AINA-2017)   51 - 56   2017年

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    担当区分:筆頭著者   記述言語:英語  

    DOI: 10.1109/AINA.2017.60

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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年

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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 (ネットワークシステム)

    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 = IEICE technical report : 信学技報   116 ( 382 )   95 - 100   2016年12月

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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, 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年12月

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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年12月

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    記述言語:英語   出版者・発行元:電子情報通信学会  

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  • Javaプログラミング学習支援システムの課題提示およびエレメント補充問題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   116 ( 351(ET2016 66-77) )   33 - 38   2016年12月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • Javaプログラミング教育支援システムJPLASのコード作成問題のオフライン解答機能

    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年12月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • 任意の画像のQRコード化とそのアプリ開発

    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年11月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • Throughput Measurements for Access-Point Setup Optimization in IEEE802.11n Wireless Networks (知的環境とセンサネットワーク) -- (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年7月

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    記述言語:英語   出版者・発行元:電子情報通信学会  

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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年7月

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    記述言語:英語   出版者・発行元:電子情報通信学会  

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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年7月

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    記述言語:英語   出版者・発行元:電子情報通信学会  

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  • ケルクホフスの原理に基づく電子透かし方式の安全性において特徴選出および信号処理の重要性 (情報セキュリティ)

    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年7月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • 雑音特性を考慮した電子透かし方式への誤り訂正符号の適用と考察

    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年7月

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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   116 ( 85(ET2016 8-20) )   41 - 46   2016年6月

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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   116 ( 85(ET2016 8-20) )   47 - 52   2016年6月

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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 (ネットワークシステム)

    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 = IEICE technical report : 信学技報   116 ( 8 )   11 - 16   2016年4月

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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

    電子情報通信学会総合大会講演論文集   2016 ( 2 )   "S - 72"-"S-73"   2016年3月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    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

    電子情報通信学会総合大会講演論文集   2016 ( 2 )   "S - 76"-"S-77"   2016年3月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    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

    電子情報通信学会総合大会講演論文集   2016 ( 2 )   "S - 80"-"S-81"   2016年3月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    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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  • 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   115 ( 419(MSS2015 35-66) )   35 - 40   2016年1月

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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   115 ( 419(MSS2015 35-66) )   153 - 158   2016年1月

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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年1月

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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年1月

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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年

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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年

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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年

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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年

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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, and Nobuo Funabiki

    The Fourth International Symposium on Computing and Networking (CANDAR, ASON)   318 - 324   2016年

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    担当区分:筆頭著者   記述言語:英語  

    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年

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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年

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    担当区分:筆頭著者   記述言語:英語  

    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, and Wen-Chung Kao

    2016 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW 2016)   277 - 278   2016年

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    担当区分:筆頭著者   記述言語:英語  

    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, and Wen-Chung Kao

    2016 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW 2016)   315 - 316   2016年

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    担当区分:筆頭著者   記述言語:英語  

    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, and Nobuo Funabiki

    The 5th IEEE Global Conference on Consumer Electronics (GCCE2016)   216 - 219   2016年

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    担当区分:筆頭著者   記述言語:英語  

    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, and Minoru Kuribayashi

    The 5th IEEE Global Conference on Consumer Electronics (GCCE2016)   3 - 5   2016年

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    担当区分:筆頭著者   記述言語:英語  

    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, and Wen-Chung Kao

    The 5th IEEE Global Conference on Consumer Electronics (GCCE2016)   479 - 480   2016年

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    担当区分:筆頭著者   記述言語:英語  

    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, Minoru Kuribayashi, and Wen-Chung Kao

    The 8th International Workshop on Virtual Environment and Network-Oriented Applications (VENOA-2016)   561 - 566   2016年

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    担当区分:筆頭著者   記述言語:英語  

    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年

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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年

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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 (マルチメディア情報ハイディング・エンリッチメント)

    松島 由紀子, 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 ( 221 )   67 - 72   2015年9月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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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

    電子情報通信学会ソサイエティ大会講演論文集   2015 ( 2 )   "S - 19"-"S-20"   2015年8月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    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年8月

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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年7月

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    記述言語:英語   出版者・発行元:電子情報通信学会  

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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 (ネットワークシステム)

    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 = IEICE technical report : 信学技報   115 ( 159 )   141 - 146   2015年7月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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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 (ネットワークシステム)

    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 = IEICE technical report : 信学技報   114 ( 477 )   553 - 558   2015年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本グループでは,同一組織内,(例えば大学の研究室など)のメンバが使用するPCの遊休計算資源(CPUサイクル)を利用することで並列計算環境を実現するユーザPCコンピューティングシステム(UPC:User-PC Computing System)を提案・実装している.従来のUPCの実装では,新規のジョブをワーカの性能順に許容数まで割り当てる逐次スケジューリング法を採用しているため,一部のワーカにジョブが割り当てられない場合が生じる.本研究では,一定数のジョブを全ワーカにラウンドロビン(RR)で割り当てる静的RR法および動的RR法を提案する.後者では,ワーカの性能評価に直近のジョブ計算時間を用いることで,ワーカの負荷変化を考慮している.評価の結果,ワーカの性能差・ジョブ数が小さい場合には両RR法,性能差・ジョブ数が大きい場合には動的RR法が適することがわかった.

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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 (ネットワークシステム)

    藤田 翔, 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   114 ( 477 )   427 - 432   2015年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    無線メッシュネットワークWIMNET(Wireless Internet-access Mesh NETwork)は,複数のアクセスポイント(AP)間を無線接続することで,安価で広域のインターネットアクセス通信網の構築を狙いとしている.本グループでは,大規模WIMNETの高速化・低コスト化を目的として,通信時に実際に動作するAPを選択する動作AP選択アルゴリズムを提案している.本研究では,モバイルルータの導入によるWIMNETの高性能化のために,本アルゴリズムの拡張を行う.また,実用性を高めるために,リンク通信速度を用いた複数APの一括停止手法を提案する.提案するアルゴリズム拡張の有効性を,2例題に対するシミュレーションにより示す.

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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年2月

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    記述言語:日本語  

    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年2月

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    記述言語:日本語  

    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年2月

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    記述言語:日本語  

    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

    IEICE Transactions on Fundamentals   E98A ( 1 )   117 - 131   2015年1月

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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 2015)   482 - 483   2015年

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  • Practices of cooking-step scheduling algorithm for homemade cooking

    Yukiko Matsushima, Nobuo Funabiki

    4th International Congress on Advanced Applied Informatics (AAI 2015)   500 - 505   2015年

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  • A concept of value trace problem for Java code reading education

    Khin Khin Zaw, Nobuo Funabiki

    4th International Congress on Advanced Applied Informatics (AAI 2015)   253 - 258   2015年

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  • A proposal of statement fill-in-blank problem in Java programming learning assistant system

    Nobuya Ishihara, Nobuo Funabiki

    4th International Congress on Advanced Applied Informatics (AAI 2015)   247 - 252   2015年

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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年

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    記述言語:英語  

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  • An operator fill-in-blank problem for algorithm understanding in Java programming learning assistant system

    Nobuo Funabiki, Shin Sasaki, Tana, Wen-Chung Kao

    The 4th IEEE Global Conference on Consumer Electronics (GCCE2015)   346 - 347   2015年

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    担当区分:筆頭著者   記述言語:英語  

    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年

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    記述言語:英語  

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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年

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    記述言語:英語  

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  • A worker implementation on Windows OS for user-PC computing system

    Nobuo Funabiki, Yusuke Asai, Yuuki Aoyagi, Wen-Chung Kao

    The Third International Symposium on Computing and Networking (CANDAR, ASON)   279 - 282   2015年

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    担当区分:筆頭著者   記述言語:英語  

    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

    The 4th IEEE Global Conference on Consumer Electronics (GCCE2015)   350 - 353   2015年

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  • An extension of statement fill-in-blank problem in Java programming learning assistant system

    Nobuya Ishihara, Nobuo Funabiki, Tana, Wen-Chung Kao

    The 4th IEEE Global Conference on Consumer Electronics (GCCE2015)   354 - 358   2015年

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  • Correlation analysis of fill-in-blank problem solutions to final programming results in Java programming course

    Tana, Nobuo Funabiki, Nobuya Ishihara, Wen-Chung Kao

    The 4th IEEE Global Conference on Consumer Electronics (GCCE2015)   348 - 349   2015年

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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

    The Third International Symposium on Computing and Networking (CANDAR, ASON)   246 - 252   2015年

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  • Extensions of Access-Point Aggregation Algorithm for Large-scale Wireless Local Area Networks

    Ezharul Islam Md., Funabiki Nobuo, Nakanishi Toru

    International Journal of Networking and Computing   5 ( 1 )   200 - 222   2015年

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    記述言語:英語   出版者・発行元:IJNC Editorial Committee  

    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

    Tana, Nobuo Funabiki, Nobuya Ishihara

    2015 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW 2015)   120 - 121   2015年

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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 2015)   480 - 481   2015年

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    担当区分:筆頭著者   記述言語:英語  

    DOI: 10.1109/ICCE-TW.2015.7217009

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  • An anonymous reputation system with reputation secrecy for manager

    IEICE Transactions on Fundamentals   E97A ( 12 )   2325 - 2335   2014年12月

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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 (ソフトウェアサイエンス)

    塔娜, 舩曵 信生, 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   114 ( 271 )   1 - 6   2014年10月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    開発環境,堅牢性,可搬性に優れたプログラミング言語Javaは,産業界で広く利用されている.本グループでは,そ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)を開発している.JPLASでは,Java初学者を対象に,Javaコード中の空欄に適切な語を解答することで,Javaの文法やコードの書き方を学ぶ空欄補充問題を提供している.本研究では,Javaコード中の空欄候補の語を点として,同時に空欄化した場合にも一意性を充たす語間に辺を有するグラフを作成し,そのクリークを探索することで,解の一意性を充たす,空欄語選択アルゴリズムを提案する.本アルゴリズムの評価として,100個の様々なJavaコードに対して提案アルゴリズムを適用し,得られた空欄語における解の一意性を手動で検証した.その結果,一部のコードに対してはその実行結果を示すことで,全コードでの解の一意性を充たすことが確認された.

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  • A Study of Access-Point Allocation Algorithm for Scalable Wireless Mesh Networks in Indoor Environments (ネットワークシステム)

    ファラグ ターメル, 舩曵 信生, ハッサン ワラ

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   114 ( 252 )   1 - 6   2014年10月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    本グループでは,これまで複数ゲートウエイ(GW)とホップ数制限を有する,インターネットアクセス網としての無線メッシュネットワークWIMNETのアクセスポイント(AP)配置アルゴリズムを提案している.K個のGWに対して,本アルゴリズムは,1) K平均法を用いた通信領域のK個のクラスタへの分割,2) 1GW用AP配置アルゴリズムの各クラスタへの逐次適用によるAP配置,3) 複数GWおよびホップ数制限を考慮した経路アルゴリズムの全クラスタへの適用による経路探索,で構成されている.本研究では,WIMNETが通常利用される室内環境での本AP配置アルゴリズムに関する検討を行う.ここでは,1つの壁の通過でリンク通信速度は15%低下すること,自由空間で10mのリンク距離の増加に等価であると仮定している.隣接する部屋に複数のGWが配置された場合といったK平均法に適さない状況に対して,これらのGWを1つの仮想GWと見なしてアルゴリズムの1),2)を適用した後,個々のGWとして3)を適用する.WIMNETシミュレータを用いた室内例題でのシミュレーションにより,本アルゴリズムの有効性を検証する.

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  • MU-MIMOのためのWIMNETシミュレータ拡張の一検討 (ネットワークシステム)

    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 = IEICE technical report : 信学技報   114 ( 252 )   7 - 12   2014年10月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    近年,新しい高速の無線通信プロトコルとして,IEEE802.11acが注目されている.IEEE802.11acでは,複数フレームの同時転送によりオーバヘッドを低減するフレームアグリゲーション,同一チャネルでの複数ノードへのパケット転送によりチャネル効率を高めるMU-MIMO (Multi-User Multi-Input-Multi-Output)が採用されている.本グループでは,アクセスポイント間の無線接続により広範囲のインターネット接続環境を提供する無線メッシュネットワークWIMNET (Wireless Internet-access Mesh NETwork)における,本プロトコルの効率的な適用についての研究を進めている.本研究では,IEEE802.11acをWIMNETに用いた場合の通信性能の評価のために,本グループで開発しているWIMNETシミュレータのフレームアグリゲーションおよびMU-MIMO拡張の検討を行う.拡張したWIMNETシミュレータを用いたシミュレーションにより,それらの効果の評価を行う.

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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 (マルチメディア情報ハイディング・エンリッチメント)

    松島 由紀子, 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   114 ( 222 )   5 - 10   2014年9月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本研究グループでは,手作り料理による安価で健康な生活の支援を目的として,多種類の料理を調理する際の所用時間を最小とする,調理作業手順を生成するための調埋手順最適化アルゴリズムの提案を行っている.ここでは,各料理の調理を,定められた時間を要する複数の作業の組合せとして与え,作業毎の調理者や調理器具の制約を判断しながら,調理手順のスケジュールを生成する.本研究では,調理者の熟達度や調理環境の変化によって,実際の作業時間が変化する場合の本アルゴリズムのロバスト性の評価を行う.まず,与えられたスケジュールと作業時間に従って,調理シミュレーションを行う評価用調理モデルを開発し,各作業時間を設定時間の30%までの範囲でランダムに増減した場合のシミュレーションを行った.また,4種類の料理を実際に調理する実験を行った.いずれの場合も,作業時間の変化に対して総調理時間の変化が小さく,本アルゴリズムのロバスト性が確認された.

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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

    電子情報通信学会ソサイエティ大会講演論文集   2014 ( 2 )   "S - 38"-"S-39"   2014年9月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    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

    電子情報通信学会ソサイエティ大会講演論文集   2014 ( 2 )   "S - 36"-"S-37"   2014年9月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    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 (情報セキュリティ)

    サディア, 中西 透, 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   114 ( 203 )   21 - 26   2014年9月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    匿名属性認証システムでは,ユーザが誰であるかを秘匿したまま,自分の年齢や性別などの属性がある関係を満たしていることをサービス提供者に証明することを可能とする.従来,OR関係で1つの属性のみが真となるモノトーン論理式の充足を証明可能な匿名属性認証方式を提案している.モノトーン論理式とは,AND関係とOR関係の論理式の任意の組み合わせである.しかし,従来方式ではOR関係で2つ以上の属性が真となる場合に検証できない,といった問題がある.本研究では,Linear Homomorphic (LH)署名を用いることで検証に必要な最小の属性のみを示す証明書を生成することで,任意のモノトーン論理式を証明可能な匿名属性認証方式を提案する.

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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 (メディア工学)

    松島 由紀子, 舩曵 信生

    映像情報メディア学会技術報告 = ITE technical report   38 ( 36 )   5 - 10   2014年9月

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    記述言語:日本語   出版者・発行元:映像情報メディア学会  

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  • Throughput Evaluations Using NS-2 for Access-Point Aggregation Algorithm in IEEE802.11n Wireless LANs (情報ネットワーク)

    HASSAN Walaa, 船曳 信生, EZHARUL ISLAM Md., ファラグ ターメル

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   114 ( 110 )   25 - 30   2014年6月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    IEEE802.11規約のWiFi無線技術は,効率的な無線LANとして一般的となっている.近年,その中でIEEE802.11nプロトコルは,600Mbpsまでの通信を可能とする技術として広まっている.複数のアクセスポイント(AP)を採用した大規模な無線LANに対して,本グループでは,その運用コストの最小化と通信性能の最大化を図るために,AP集約アルゴリズムを提案してきた.しかしながら,本アルゴリズムの有効性は,本グループでシンプルなネットワークシミュレータとして独自に開発しているWIMNETシミュレータのみで検証されている.そこで本研究では,WanggとWeiによって導入された802.11nモジュールをバージョン2.34のNS-2シミュレータの実装し,それを用いたシミュレーションにより本アルゴリズムの性能評価を行った.

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  • An Extension of Access Point Allocation Algorithm for Wireless Mesh Networks with Multiple Gateways and Maximum Hop Limitation (情報ネットワーク)

    FARAG Tamer, 船曳 信生, HASSAN Walaa

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   114 ( 110 )   31 - 36   2014年6月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    安価でスケーラブルなインターネット接続用無線ネットワークとして,本グループでは,WDS接続された複数のアクセスポイント(AP)を用いるWIMNETの設計最適化に関する研究を進めている.WIMNETでは,その適切なAP配置が通信性能の確保と導入・運用コストの低減に不可欠である.そのため,本グループではこれまでWIMNETのAP配置アルゴリズムを提案している.しかし,そこでは,インターネット接続ゲートウェイ(GW)は1つのみであり,ホストからGWまでのホップ数には制限を設けていなかった.そこで本研究では,このアルゴリズムを,大規模なWIMNETでは一般的となる,複数GWでホップ数制限のある場合に拡張する.最初にk-meansアルゴリズムを適用し,ホストをK個の部分ネットワークに分割する(KはGW数).次に,従来のAP配置アルゴリズムを各部分ネットワークに順に適用して,AP配置を求める.最後に,既存の経路アルゴリズムを適用することで,ホップ数制限を充たす経路を得る.1つの例題に対するシミュレーションにより,提案アルゴリズムの有効性を検証する.

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  • 無線メッシュネットワークのフレームアグリゲーション考慮のための拡張 (情報ネットワーク)

    谷 祐馬, 船曳 信生, 田島 滋人

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   114 ( 110 )   19 - 24   2014年6月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本グループでは,柔軟・低コストのインターネットアクセス網として,無線接続された複数のアクセスポイント(AP)で構成される無線メッシュネットワークWIMNEW(Wireless Internet-access Mesh NETwork)の研究を進めている.従来の研究で,1)複数ゲートウェイ,2)無線リンク速度変化,3)ホップ数制約といったWIMNETの現実的環境に対する経路アルゴリズムを提案している.本研究では,WIMNETの更なる高性能化のために,高速無線通信プロトコルIEEE802.11acで採用されているフレームアグリゲーション考慮した経路アルゴリズムの拡張を行う.3例題に対するWIMNETシミュレータを用いたシミュレーションにより,本アルゴリズム拡張の有効性を検証する.

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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 (教育工学)

    石原 信也, 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   114 ( 82 )   57 - 62   2014年6月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本研究室では,課題に対する学生からの解答を自動検証することで,初学者に対しても自主的な繰り返し学習を可能とするために,JSP, Servlet, Javaビーンズを用いたWebアプリケーションとしてJavaプログラミング学習支援システムJPLASの開発を行っている.JPLASでは,本研究室の新たな学生がその引継を受け,記述法を学びながら自らの判断で実装しているために,コードの保守や更新作業が煩雑なものとなっている.また,近年,HTML5, CSS3で代表される,リッチクライアント化のためのWeb標準が普及しているが,それには対応していない.そこで本研究では,JPLASのコードに対して,Web標準に準拠した記述ルールの検討を行う.HTML5およびAjaxを採用することで,冗長性を低減した保守性の高いコードの記述を可能とする.

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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 (教育工学)

    塔娜, 舩曵 信生, 石原 信也, 小川 卓也

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   114 ( 82 )   63 - 68   2014年6月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本グループでは,大学や専門学校におけるJavaプログラミング教育の支援を目的として,Webを用いたJavaプログラミング学習支援システムJPLAS(Java Programming Learning Assistant System)を開発している.JPLASでは,Java初学者を対象とした空欄補充問題を実装しており,その問題生成のためにグラフ理論に基づく空欄補充問題生成アルゴリズムを提案している.本研究では,Java文法の更なる理解の促進を目的として,文法的に関連する語同士を同時に空欄化するためのアルゴリズム拡張を行う.また,従来10個以下に制限していた空欄を最大20個までとした場合の評価を行う.生成した問題をJavaプログラミング中級レベルの学生に適用した結果,正答率に関して,文法的に関連する語同士の同時空欄化よりも,問題とするJavaコードの長さ,クラス数,メソッド数,実装されている処理の難しさ,コメントの有無の影響が大きいことが明らかとなった.

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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 (教育工学)

    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 = IEICE technical report : 信学技報   113 ( 482 )   35 - 40   2014年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本グループでは,WebによるJavaプログラミング学習支援システムJPLAS (Java Programming Learning Assistant System)を提案している.JPLASでは,学生のコードの検証にテスト駆動型開発を用いることで,学生の学習支援に加え,教員の負荷軽減も目的としている.本研究では,プログラミング学習で重要であるが,軽視されてきたコードリーディングに対する学習支援の試みとして,JPLASにステートメント補充問題機能を提案,実装する.ステートメント補充問題とは,課題となるソースコード(出題コード)中に設けられた空欄に適切なステートメントを入力させる形式の演習問題である.本機能では,プログラム依存グラフを用いることで,出題コードの要点となるステートメントを空欄化する.提案機能を用いて,類似の処理を有する複数のステートメント補充問題を作成し.Javaプログラミング授業の受講者に適用したところ,より多くの問題を解くに連れ,学生の解答時間が短縮されていることが明らかとなった.

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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 (教育工学)

    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 = IEICE technical report : 信学技報   113 ( 482 )   41 - 46   2014年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本グループでは,Javaプログラミング教育における学生の自習支援,ならびに,教員の負担の軽減を目的として,Webを用いたJavaプログラミング学習支援システムJPLAS (Java Programming Learning Assistant System)の提案を行っている.JPLASでは,2種類の空欄補充問題(エレメント補充問題,ステートメント補充問題)が実装されている.これらの問題は,Javaプログラミング初学者を対象とした本学の授業における自習課題として,学生に適用されている.本研究では,教員がJPLASで生成した問題の難易度を推定するための指標を列挙した後,自習結果での各問題の正答率との相関分析を行うことで,各問題の難易度推定に適した指標の提案を行う.これにより,各空欄補充問題の難易度推定法をJPLASに実装することで,教員が学生のレベルに応じた問題の提示を可能とする.

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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 (回路とシステム)

    藤田 翔, 船曳 信生, 中西 透

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 463 )   35 - 40   2014年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    無線メッシュネットワークWIMNE (Wireless Internet-access Mesh NETwork)では,複数のアクセスポイント(AP)間を無線通信で接続することで,安価で柔軟なインターネットアクセス通信網の構築が可能である.本グループでは,1つのインターネットゲートウェイ(GW)を有するWIMNETにおいて,その信頼性向上のためにAPを冗長に配置した場合に,通信時に実際に動作させるAPを選択するための動作AP選択アルゴリズムの提案を行っている.しかし,WIMNETの現実的な実装環境を考慮した場合,GWは複数存在する上に,GW・ホスト間のホップ数(中継ノード数)にも制限がある.また,近年の高速無線プロトコルIEEE802.11acでは,通信速度が距離に大きく依存することが明らかとなっている.そこで本研究では,これらの現実的環境に対応した動作AP選択アルゴリズムの拡張を行う.4つの例題に対するシミュレーションにより,本アルゴリズム拡張の有効性を示す.

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  • File Synchronization Performance using Bittorrent Sync in IEEE802.11ac Wireless Networks (回路とシステム)

    金 奉洙, 舩曵 信生, 中西 透

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 463 )   29 - 34   2014年3月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    近年,ビットトレント社はP2P型ファイル共有ソフトBittorrentをベースとして,ファイル同期ソフトウェアBittorrent Syncを公開している.このソフトウェアを用いることでユーザは,管理サーバを介さずに,インターネット接続された複数の機器上の指定されたフォルダ間で,ファイルの同期が可能となる.これらの機器には,異なるOSを用いたパーソナルコンピュータやスマートフォン,タブレットが含まれる.同期すべきフォルダの認識のために,このソフトウェアは,ランダムに生成される20ビットの秘密鍵を用いる.本グループでは,大規模な無線LANの複数機器間でのファイル共有に,Bittorrent Syncの利用を検討している.本無線LANのいくつかの機器は,マルチホップの無線リンクで接続されている.本研究では,近年,高速無線通信プロトコルとして導入されている,IEEE802.11acを用いた簡単な無線LANの実験環境を構築し,様々なサイズのファイルを本ソフトウェアで共有した場合のスループットを測定する.その結果,本方式は,極めて高速で安定的であること,大きなファイルが小さなファイルよりも高速に共有できることを示す.

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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 (回路とシステム)

    田島 滋人, 船曳 信生, 東野 輝夫

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 463 )   103 - 108   2014年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    無線メッシュネットワークWIMNET (Wireless Internet-access Mesh Network)は,複数のアクセスポイント(AP)間を無線接続することで,安価で柔軟に拡張可能なインターネットアクセス網を実現する.WIMNETの高速化のためには,トラヒック量の多いAP間通信に対して,近年普及の始まっている高速無線通信プロトコルIEEE802.11n/acの採用が重要である.これらのプロトコルでは,高速化を実現する技術の1つとして,複数フレームを連結し一度に送信することで通信のオーバーヘッドを抑制するフレームアグリゲーションが採用されている.WIMNETのAP間通信では,通常,複数のホストの通信を扱うことから,フレームアグリゲーションの効果をより高めることが可能と考えられる.本研究では,その検証のために,フレームアグリゲーションのモデル化と,本グループで開発しているWIMNETシミュレータの拡張を行う.本シミュレータを用いた単純トポロジ例題に対するシミュレーションにより,フレームアグリゲーションの有効性と,同時送信フレーム数の適正化および経路集約の必要性を示す.

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  • Throughput Measurements Using IEEE 802.11ac Devices for High-Speed Wireless Networks (回路とシステム)

    チュウ チャン チョン, 舩曵 信生, 中西 透

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 463 )   23 - 28   2014年3月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    近年,IEEE802.11ac通信プロトコルが高速無線ネットワークの実現のために提案されている.実際,そのプロトコルを実装した商用の無線機器が,複数のベンダーから提供されている.本研究では,あるTCPパラメータの下で,ホップ数(1ホップ,2ホップ),通信路上の壁の有無,異なる通信距離,リピータ利用の有無,といった様々な条件において,3つのベンダーから販売されている11ac無線機器を用いた,多様なTCPスループット測定結果を示す.本測定結果では,11ac無線機器によるTCPスループットがベンダーや通信条件によって大きく変化することを示す.

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  • Android端末を用いたモバイル匿名属性認証システムの実装

    三嶋徹, 中西透, 渡邊寛, 舩曵信生

    研究報告コンピュータセキュリティ(CSEC)   2014 ( 45 )   1 - 6   2014年2月

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    記述言語:日本語   出版者・発行元:一般社団法人情報処理学会  

    ID を用いたユーザ認証システムでは、サービス提供者が ID とひも付けすることにより,ユーザの利用履歴を蓄積できてしまう問題がある.一方,サービス提供者はユーザの属性を用いて認証を行いたい場合も多い.この問題の解決策として、個人を特定できる情報を用いずにユーザの属性のみを用いて認証を行う匿名属性認証システムが提案されている.本研究では Android 端末に搭載されている NFC および Bluetooth を利用し,端末間でかざす動作により簡便に匿名属性認証を行うシステムを実装した.実機での評価実験の結果,認証プロトコルの実行に要した時間は約 0.98 秒であり、端末間の接続確立も含めた全処理時間は約 1.85 秒となった.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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  • Webブラウザを用いたボランティアコンピューティングプラットフォームの提案

    高木 省吾, 渡邊 寛, 福士 将, 天野 憲樹, 舩曵 信生, 中西 透

    研究報告ハイパフォーマンスコンピューティング(HPC)   2014 ( 29 )   1 - 8   2014年2月

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    記述言語:日本語   出版者・発行元:一般社団法人情報処理学会  

    ボランティアコンピューティング (VC) で高い性能を実現するためには,多数の参加者を集める事が重要である.しかし,既存の VC システムでは,参加に際して専用ソフトウェアのインストール等の手間がかかり,参加の障害となっている.そこで本研究では,参加者が Web ブラウザで指定の URL にアクセスするだけで即座に VC に参加することができるような,Web ベースの VC プラットフォームを提案する.提案するプラットフォームでは,PNaCl 等の LLVM 技術を用いることで,C/C++ で記述された計算問題を Web アプリ化し,ブラウザ上で高速に実行することができる.性能評価として,PNaCl を用いて姫野ベンチマークを Web アプリ化した場合,ネィティブアプリと同等の実行性能を実現できることを確認した.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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  • 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 (ソフトウェアサイエンス)

    張 一加, 舩曵 信生, 中西 透

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 422 )   11 - 16   2014年1月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本研究グループでは,勤労者や学生など忙しい毎日を送る人への「手作り料理」支援を目的とした調理手順スケジューリングアルゴリズムを提案している.本アルゴリズムを用いて,Webに公開されているレシピーのスケジュールを作成する場合,アルゴリズム固有の入力形式への変換が必要である.そこで本研究では,そのためにアルゴリズムで定義された6種類の調理手順への変換とその調理時間の推定を行うWeb公開レシピー変換アルゴリズムの提案を行う.提案アルゴリズムでは,各調理手順に対応するキーワード群を予め定義しておき,レシピー文章中に現れるキーワードを抽出することで,調理手順変換と時間推定を行う.100種類のWeb公開レシピーへの適用により,本アルゴリズムの有効性を検証する.

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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 (教育工学)

    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 = IEICE technical report : 信学技報   113 ( 377 )   115 - 120   2014年1月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    Javaは,信頼性,可搬性,学習性に優れたプログラミング言語として,多くの大学や専門学校で教育が行われている.このJava教育の支援を目的として本グループでは,テスト駆動開発手法に基づき,学生の作成したプログラムの自動検証を行うことで自主学習を可能とする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)を提案している.しかし,JPLASでは,自動検証のためのテストコードを理解した上でのソースコード作成を必要とする上,Java言語の経験の浅い学生には利用が困難であった.そこで本研究では,JPLASにおいて,テストコードからソースコード作成に必要な情報の入手方法を学ぶためのコード設計学習機能に,Javadocを用いたヒント機能を追加した.これにより,ソースコードの全体構造の理解を促し,より詳細なコード設計を可能とすることを狙いとしている.提案機能を本研究室の学生10名に適用し,その有効性を明らかにした.

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  • Implementation of anonymous credential system with efficient proofs for monotone formulas on attributes excluding restriction

    Shahidatul Sadiah, Toru Nakanishi, and Nobuo Funabiki

    The Second International Symposium on Computing and Networking (CANDAR, WICS)   531 - 535   2014年

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  • A proposal of routing algorithm under practical conditions for wireless Internet-access mesh networks

    Nobuo Funabiki, Toru Nakanishi, and Wataru Maruyama

    2014 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW 2014)   27 - 28   2014年

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    担当区分:筆頭著者   記述言語:英語  

    DOI: 10.1109/ICCE-TW.2014.6904085

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  • Extensions of active access-point selection algorithm for wireless mesh networks using IEEE802.11ac protocol

    Chang Choon Chew, Nobuo Funabiki, and Sho Fujita

    The Second International Symposium on Computing and Networking (CANDAR, PDAA)   310 - 314   2014年

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  • A frame aggregation extension of routing algorithm for wireless mesh networks

    Nobuo Funabiki, Yuuma Tani, and Shigeto Tajima

    The Second International Symposium on Computing and Networking (CANDAR, ASON)   238 - 242   2014年

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    担当区分:筆頭著者   記述言語:英語  

    DOI: 10.1109/CANDAR.2014.28

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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年

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    記述言語:英語  

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  • A proposal of Javadoc hint function for Java programming learning assistant system

    Nobuo Funabiki, Takuya Nakamura, and Wen-Chung Kao

    The 3rd IEEE Global Conference on Consumer Electronics (GCCE2014)   304 - 308   2014年

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    担当区分:筆頭著者   記述言語:英語  

    DOI: 10.1109/GCCE.2014.7031127

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  • An Extension of Access-Point Allocation Algorithm for Adapting Link Speed Change in Wireless Mesh Network (ネットワークシステム)

    ファラグ ターメル, 舩曵 信生, ハッサン ワラ

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 360 )   137 - 142   2013年12月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    本グループでは,安価でスケーラブルなインターネットアクセス網として,無線メッシュネットワークWIMNETの設計最適化に関する様々な研究を進めている.WIMNETは,無線リンクで互いに接続される複数のアクセスポイント(AP)で構成される.WIMNETでは,APの適正配置がホストの通信性能の確保と共に,その導入および管理コストの最小化に重要である.そのため,従来,WIMNETのためのAP配置アルゴリズムを提案してきた.その際,全リンクの速度がリンク状態に無関係に一定としている.しかし,近年,利用が増加している高速のIEEE802.11n/acプロトコルでは,リンク速度はその距離や電波干渉によって大きく変化することが本グループの実験で明らかとなっている.そこで本研究では,リンク速度変化に対応するためのAP配置アルゴリズムの拡張を提案する.ここでは,従来アルゴリズムでは固定されていた最大リンク距離の最適化を行う.簡単なトポロジに対するWIMNETシミュレータを用いたシミュレーションにより,提案アルゴリズムの有効性を示す.

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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 (無線通信システム)

    丸山 渉, 舩曵 信生, 中西 透

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 361 )   249 - 254   2013年12月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本グループでは,柔軟で低コストのインターネットアクセス網として,互いに無線接続された複数のアクセスポイント(AP)で構成される無線メッシュネットワーク(WIMNET:Wireless Internet-access Mesh NETwork)の研究を進めている.これまでの研究で,1つのゲートウェイ(GW:Gateway)を対象としたWIMNETの経路木アルゴリズムを提案してきた.しかし,WIMNETの現実の実装環境を考慮した場合,GWは複数存在する上に,GW・ホスト間のホップ数(中継ノード数)にも制限がある.また,新しい通信プロトコルIEEE802.11acなどでは,通信速度が距離に大きく依存することが明らかとなっている.そこで本研究では,これらの現実的環境に対応した経路木アルゴリズムの提案を行う.WIMNETシミュレータを用いたシミュレーションにより,提案アルゴリズムの有効性を検証する.

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  • An Extension of Access-Point Allocation Algorithm for Adapting Link Speed Change in Wireless Mesh Network (無線通信システム)

    ファラグ ターメル, 舩曵 信生, ハッサン ワラ

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 361 )   255 - 260   2013年12月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    本グループでは,安価でスケーラブルなインターネットアクセス網として,無線メッシュネットワークWIMNETの設計最適化に関する様々な研究を進めている.WIMNETは,無線リンクで互いに接続される複数のアクセスポイント(AP)で構成される.WIMNETでは,APの適正配置がホストの通信性能の確保と共に,その導入および管理コストの最小化に重要である.そのため,従来,WIMNETのためのAP配置アルゴリズムを提案してきた.その際,全リンクの速度がリンク状態に無関係に一定としている.しかし,近年,利用が増加している高速のIEEE802.11n/acプロトコルでは,リンク速度はその距離や電波干渉によって大きく変化することが本グループの実験で明らかとなっている.そこで本研究では,リンク速度変化に対応するためのAP配置アルゴリズムの拡張を提案する.ここでは,従来アルゴリズムでは固定されていた最大リンク距離の最適化を行う.簡単なトポロジに対するWIMNETシミュレータを用いたシミュレーションにより,提案アルゴリズムの有効性を示す.

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  • 誤り発生確率が変化するボランティアコンピューティングにおける信頼度に基づく多数決法の評価と改善

    渡邊 寛, 福士 将, 舩曵 信生, 中西 透

    研究報告計算機アーキテクチャ(ARC)   2013 ( 26 )   1 - 8   2013年12月

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    記述言語:日本語  

    本稿では,誤った計算結果の発生確率 (妨害率) が時間的に変化するボランティアコンピューティング (VC) 環境を対象として,信頼度に基づく多数決法の計算信頼性保証能力の評価と改善を行う.同手法は,各参加者が正しい結果を返す確率 (信頼度) を計算し,多数決で誤りが採択されてしまう確率を常に指定値以下に抑えることで信頼性保証を実現する.しかし,同手法では,妨害率は時間的に一定な定数値として仮定されているため,実環境のように,妨害率が変動する環境に適用した場合の有効性は十分に検証されていない.そこで本稿では,計算の信頼性を最も大きく低下させると思われる,妨害率がステップ関数に従って変化するモデルを用いて,同手法の信頼性保証能力を評価する.さらに,本モデルを用いた場合の計算信頼性の数学的な解析を行い,パラメータ制限を加える改善法を提案する.この改善により,妨害率が時間的にどのように変化する場合でも信頼性保証が実現できることを示す.To ensure the reliability of computations in Volunteer Computing (VC) systems, credibility-based voting method is proposed. This method has the capability of guaranteeing the reliability condition that the error rate is less than the specified acceptable value. The capability has been demonstrated under the model that the probability of returning incorrect results s is a constant. However, in actual VC systems, the probability should be changed with time for several reasons, e.g. hardware/software failures or age-related degradations. In this paper, we evaluate the capability of credibility-based voting through simulations with step-functions type model of s. We also propose an improvement of credibility-based voting by a simple parameter tuning to ensure the reliability condition for any model of s.

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  • 信頼度に基づく多数決法を用いたボランティアコンピューティングシステムの実装

    土居俊也, 渡邊寛, 福士将, 舩曵信生, 中西透

    研究報告計算機アーキテクチャ(ARC)   2013 ( 19 )   1 - 7   2013年12月

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    記述言語:日本語  

    ボランティアコンピューティング (VC) では,通常,誤った計算結果に含まれる誤りを排除するために,多数決法が採用される.先行研究では,各参加者が正答を返す信頼度を用いて重み付き多数決を行う信頼度に基づく多数決法が提案されている.シミュレーションにより,少ない冗長数で効率的に誤りを排除可能なことが示されているが,本手法を実際に動作させた際に発生する処理のオーバーヘッドはまだ明らかにされていない.そこで本稿では,実環境における有効性を確認するために,同手法を実装した VC システムを構築し,性能評価実験を行った.実験の結果,システムの規模が大きくなると,信頼度に基づく多数決法を用いた場合では,単純な多数決を用いた場合に比べて性能低下の割合が大きいことが確認された.また,多数決処理に要した時間の内訳を調べた結果,信頼度計算を伴う一部の多数決処理が,性能低下の割合を大きくする原因であることがわかった.In volunteer computing(VC) systems, a management node distributes a computation to multiple participants, collects result candidates, and then preforms voting to eliminate incorrect ones. To enhance the efficiency of voting methods, "credibility-based voting" is proposed, which performs weighted-voting based on each participants' credibility. In this paper, we implement this voting method to actual VC systems and evaluate the performance through experiments with varying scales of the system. As a result of the experiment, we confirmed that the performance degradation of credibility-based voting is proportional to the number of the workers. We also found that the performance degradation comes from the overhead of the management node, i.e. the computation of credibility.

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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   E96A ( 12 )   2422 - 2433   2013年12月

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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

    SADIAH Shahidatul, 中西 透, 渡邊 寛, 舩曳 信生

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 217 )   21 - 28   2013年9月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    匿名属性認証システムでは,ユーザが誰であるかを秘匿したまま,自分の年齢や性別などの属性を保持していることをサービス提供者に証明する.従来,和積標準形(CNF)の論理式を満たす属性の所持を証明可能な匿名属性システムが提案されている.しかし,年齢の大小関係を生年月日を用いてCNF式で証明する場合,各生年月日を属性一つに対応づける必要があり,各属性は一つの公開パラメータを要することから,公開鍵サイズが大きくなり,計算時間も大きくなる問題がある.そこで本論文では,公開鍵サイズと計算時間を減らすことを目的とし,「年月日」の属性を「年」「月」「日」の属性に分割することを考える.これにより属性数が0.3%程度に軽減され,公開鍵サイズも同様に軽減される.年齢の大小関係を証明する場合,属性のモノトーン論理式で表す必要がある.本研究では,従来方式で用いていたアキュムレータを拡張し,モノトーン論理式を証明可能な方式を提案する.また,実装したシステムの処理時間の測定から提案システムの有効性を示す.

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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 (ネットワークシステム)

    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 = IEICE technical report : 信学技報   113 ( 129 )   155 - 160   2013年7月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    無線メッシュネットワークWIMNET (Wireless Internet-access Mesh NETwork)は,無線接続された複数のアクセスポイント(AP)を利用することで,スケーラブルなインターネットアクセス網を形成する.これまでの研究において,全無線リンクの速度を一定として,大規模WIMNETのAPを複数のクラスタに分割するためのアルゴリズムを提案している.一方,近年普及の始まっている高速通信プロトコルIEEE802.11nでは,予備実験において,リンク速度はその距離などに大きく依存することが明らかとなっている.そこで本研究では,WIMNETにおけるIEEE802.11nの効果的な導入のために,リンク速度を考慮するためのクラスタ分割アルゴリズムの拡張を行う.例題に対するシミュレーションにより,本拡張の有効性を示す.

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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年4月

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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

    電子情報通信学会総合大会講演論文集   2013 ( 2 )   "S - 50"-"S-51"   2013年3月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

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  • D-9-27 4種料理の調理での調理手順最適化アルゴリズム適用評価(D-9.ライフインテリジェンスとオフィス情報システム)

    松島 由紀子, 岡田 朋也, 舩曵 信生, 中西 透, 渡邊 寛

    電子情報通信学会総合大会講演論文集   2013 ( 1 )   125 - 125   2013年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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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

    電子情報通信学会総合大会講演論文集   2013 ( 2 )   "S - 3"-"S-4"   2013年3月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

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  • D-9-7 Webによるレシート情報管理システムの提案(D-9.ライフインテリジェンスとオフィス情報システム)

    塔 梛, 舩曵 信生, 中西 透, 渡邊 寛

    電子情報通信学会総合大会講演論文集   2013 ( 1 )   105 - 105   2013年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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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 (ネットワークシステム)

    丸山 渉, 舩曳 信生, 中西 透, 渡邊 寛

    電子情報通信学会技術研究報告 : 信学技報   112 ( 392 )   1 - 6   2013年1月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本グループでは,柔軟で低コストのインターネットアクセス網として,互いに無線接続された複数のアクセスポイント(AP)で構成される無線メッシュネットワークWINNET(Wireliss internet-accee Mesh NETwork)の研究を進めている.これまで,混雑の激しいゲートウェイ接続リンクでのトラヒック量平準化による通信性能向上を狙いとした,AP間通信のための経路木アルゴリズムを提案してきた.そこでは,すべての無線リンクの通信速度が,その距離などに無関係に一定であると仮定している上に,AP・ホスト間のリンクを経路木の中で考慮していなかった.これに対して,近年普及の始まっている高速通信プロトコルIEEE802.11nでは,予備実験により,リンクの速度がその距離に大きく依存することが明らかとなっている.そこで本研究では,リンクの距離による速度変化を考慮することと,そのために必要となるホストまでの経路木の生成を狙いとして,経路木アルゴリズムの拡張を行う.3種類のトポロジでのシミュレーションにより,本アルゴリズム拡張の有効性を示す.

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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拡張 (ネットワークシステム)

    藤田 翔, 舩曳 信生, 中西 透, 渡邊 寛

    電子情報通信学会技術研究報告 : 信学技報   112 ( 392 )   19 - 24   2013年1月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    無線メッシュネットワークWIMNET(Wireless Internet-access Mesh NETWork)では,複数のアクセスポイント(AP)間を無線通信で接続することで,安価で柔軟なインターネットアクセス通信網の構築が可能である.このWIMNETにおいてAPを冗長に配置することで,その故障や通信環境の変化に対してロバスト性の高い通信環境の提供が可能となる.しかしながら,冗長APの動作による運用コストの増加,電波干渉による通信性能の劣化などが発生するため,本研究グループでは,通信時に実際に動作させるAPを選択するための動作AP選択アルゴリズムの提案を行ってきた.そこでは,簡単のために,各無線リンクの通信速度はその距離に関係なく,一定としている.これに対して,近年普及の始まっている高速通信プロトコルIEEE802.11nでは,予備実験において速度がリンクの距離に大きく依存することが明らかとなっている.そこで本研究では,リンクの速度変化を考慮した動作AP選択アルゴリズムの拡張を行う.4種類の例題でのシミュレーションにより,提案手法の有効性を検証する.

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  • An Extension of Access-Point Aggregation Algorithm Considering Link Speed Change for Wireless Local Area Networks (ネットワークシステム)

    エズハルルイスラム ムハマド, 舩曳 信生, 中西 透, 渡邊 寛

    電子情報通信学会技術研究報告 : 信学技報   112 ( 392 )   7 - 12   2013年1月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    今日,一般的に,会社や大学などの同じ建物の中に,複数の無線LANが配備・運用されている.通常,それらの無線アクセスポイント(AP)は,部署や研究室といった建物内の異なるグループ毎に独自に管理されている.そのため,無線LANのユーザホストは,複数のAPからの信号を検知することが可能となり,それらの無線干渉による通信性能の劣化や運用コストの増加に繋がる恐れがある.そのため,従来の研究において,仮想AP技術を導入し,それらのAPを集約することで実際に動作するAP数を最小化するAP集約アルゴリズムを提案してきた.近年,高速無線LANプロトコルとして,IEEE80211nプロトコルが注目されている.しかしながら,我々の予備実験において,このプロトコルによるリンクの通信速度がその距離の増加に応じて大きく低下することが明らかとなっている.本研究では,AP集約アルゴリズムを,リンク速度変化を考慮して,いずれのリンクも最低限の速度を確保しながら,全体でのスループットを最大化するように拡張する.WIMNETシミュレータを用いた例題に対するシミュレーションを通じて,提案法の有効性を示す.

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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 (ライフインテリジェンスとオフィス情報システム)

    塔娜, 船曵 信生, 中西 透, 渡邊 寛

    電子情報通信学会技術研究報告 : 信学技報   112 ( 379 )   85 - 90   2013年1月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    近年,経済不況の長期化に伴い,節約生活が求められている.本グループでは,その支援を目的として,家計簿の作成により日頃の支出を把握するともに,近隣店舗での最新の商品情報の共有を可能とする,Webを用いたレシート情報システムの開発を進めている.本研究では,まず,本システムのためのデータベースの構成を示す.また,本システムに採用したレシート文字認識ソフトにおける,1)文字認識精度不足による商品名の誤認識,2)購買価格への割引の未反映,3)食費・雑貨と言ったカテゴリ分類の手動選択の必要性,の3つの問題点の対策を図るために,1)商品名修正,2)割引価格修正,3)カテゴリ分類の3つの機能で構成される,入力データ処理アルゴリズムを提案する.提案アルゴリズムをJavaアプリケーションとして実装し,レシート12枚からの113個の商品に対する適用の結果,全商品の商品名を正しく修正し,分類することができた.

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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 (情報通信マネジメント)

    岡田 朋也, 松島 由紀子, 船曵 信生, 中西 透, 渡邊 寛

    電子情報通信学会技術研究報告 : 信学技報   112 ( 378 )   91 - 96   2013年1月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本グループでは,手作り料理による安価で健康的な生活の支援を目的として,Webによる手作り料理支援システムHOCAS(HOmemade Cooking Assistance System)の開発を進めている.これまで,HOCASサーバに献立作成機能,調理手順作成機能を実装し,社会人や学生,子育て家族など多忙な毎日を送るユーザに対して,休日における1週間分の料理のまとめ調理を可能とする献立および調理手順作成の支援を可能とした.本研究では,これらの機能からの出力結果を用いて,実際の調理場面で支援を行うための調理ガイダンス機能を,Android端末を用いたアプリケーションとして実装する.本機能は,献立内容表示,調理ガイダンス,調理時間取得の3つで構成される.評価のために,調理ガイダンス機能を実装したAndroid端末からのガイダンスに従って4種類の料理を作成する調理実験を行い,その有用性を確認した.また,本実験での調理時間の測定値をその予測値と比較して,問題点の考察と今後の課題の整理を行った.

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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 (ライフインテリジェンスとオフィス情報システム)

    岡田 朋也, 松島 由紀子, 船曵 信生, 中西 透, 渡邊 寛

    電子情報通信学会技術研究報告 : 信学技報   112 ( 379 )   91 - 96   2013年1月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本グループでは,手作り料理による安価で健康的な生活の支援を目的として,Webによる手作り料理支援システムHOCAS(HOmemade Cooking Assistance System)の開発を進めている.これまで,HOCASサーバに献立作成機能,調理手順作成機能を実装し,社会人や学生,子育て家族など多忙な毎日を送るユーザに対して,休日における1週間分の料理のまとめ調理を可能とする献立および調理手順作成の支援を可能とした.本研究では,これらの機能からの出力結果を用いて,実際の調理場面で支援を行うための調理ガイダンス機能を,Android端末を用いたアプリケーションとして実装する.本機能は,献立内容表示,調理ガイダンス,調理時間取得の3つで構成される.評価のために,調理ガイダンス機能を実装したAndroid端末からのガイダンスに従って4種類の料理を作成する調理実験を行い,その有用性を確認した.また,本実験での調理時間の測定値をその予測値と比較して,問題点の考察と今後の課題の整理を行った.

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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 (教育工学)

    伊永 洋輔, 船曳 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 : 信学技報   112 ( 374 )   63 - 68   2013年1月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    現在,多くの大学や専門学校でJava言語の教育が行われている本クループては,学生によるJava言語の自主学習支援を目的として, Webを用いたJavaプログラミング学習支援システムJPLAS(Jaja Programmamming Learning Assistant System)を開発している 本研究では, Java言語の初学者を対象とするJPLASの穴埋め問題機能を拡張し,従来の予約語に加えて,変数および文法記号の穴埋め問題化を可能とした 本機能では,予めデータベースに登録したサンプルコードより,教員が指定した語をランダムに空欄化することて穴埋め問題を自動作成する.その際正しく解答できるように,空欄化する単語に制約を設けている 本機能の評価のために,様々な語を空欄としたレベルの異なる100問を用意し,本学科のJavaプロクラミンク授業において自宅学習課題として取り組んて貰った 学習効果の評価のために,本機能て作成した問題と同等の小テストを実施したところ,解答数の多い学生ほと良好な成績を得ていることが明らかとなった

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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

    The First International Symposium on Computing and Networking (CANDAR'13)   141 - 147   2013年

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    担当区分:筆頭著者   記述言語:英語  

    DOI: 10.1109/CANDAR.2013.27

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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年

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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

    IEEE Region 10 Humanitarian Technology Conference 2013 (R10-HTC2013)   249 - 254   2013年

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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

    IEEE Region 10 Humanitarian Technology Conference 2013 (R10-HTC2013)   85 - 90   2013年

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    担当区分:筆頭著者   記述言語:英語  

    DOI: 10.1109/R10-HTC.2013.6669019

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  • A modified active access-point selection algorithm considering link speed change in IEEE 802.11n for wireless mesh network

    Nobuo Funabiki, Sho Fujita, Toru Nakanishi, Kan Watanabe

    The 5th International Workshop on Virtual Environment and Network-Oriented Applications (VENOA-2013)   714 - 719   2013年

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    担当区分:筆頭著者   記述言語:英語  

    DOI: 10.1109/CISIS.2013.128

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  • A modified routing tree algorithm considering link speed change in IEEE 802.11n for wireless mesh network

    Nobuo Funabiki, Wataru Maruyama, Toru Nakanishi, Kan Watanabe

    The 17th IEEE International Symposium on Consumer Electronics (ISCE 2013)   29 - 30   2013年

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    担当区分:筆頭著者   記述言語:英語  

    DOI: 10.1109/ISCE.2013.6570233

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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

    The 2nd IEEE Global Conference on Consumer Electronics (GCCE2013)   530 - 533   2013年

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  • An extension of clustering algorithm for considering link speed in wireless mesh networks

    Shigeto Tajima, Nobuo Funabiki, Teruo Higashino

    The 2nd IEEE Global Conference on Consumer Electronics (GCCE2013)   500 - 504   2013年

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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

    The 2nd IEEE Global Conference on Consumer Electronics (GCCE2013)   397 - 401   2013年

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    担当区分:筆頭著者   記述言語:英語  

    DOI: 10.1109/GCCE.2013.6664869

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  • An extension of menu planning algorithm for two-phase homemade cooking

    Nobuo Funabiki, Yukiko Matsushima, Toru Nakanishi, Kan Watanabe

    The 2nd IEEE Global Conference on Consumer Electronics (GCCE2013)   352 - 356   2013年

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    担当区分:筆頭著者   記述言語:英語  

    DOI: 10.1109/GCCE.2013.6664853

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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年

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  • A fixed backoff-time switching method for wireless mesh networks: design and Linux implementation

    Sritrusta Sukaridhoto, Nobuo Funabiki, Dadet Pramadihanto, Zainal Arief

    The 5th International Conference on Information Technology and Electrical Engineering (ICITEE 2013)   248 - 253   2013年

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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年

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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年

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    担当区分:筆頭著者   記述言語:英語  

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  • デスクトップグリッドにおけるワーカの性能差を考慮した信頼度計算式の拡張

    渡邊 寛, 福士 将, 舩曵 信生, 中西 透

    研究報告計算機アーキテクチャ(ARC)   2012 ( 16 )   1 - 8   2012年12月

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    記述言語:日本語  

    近年,インターネットに接続された多数のコンピュータ (ワーカ) の遊休計算資源を用いることで,スーパーコンピュータ並の計算性能を実現するデスクトップグリッド (DG) が注目されている.本稿では,誤った計算結果を返すワーカ (妨害者) が存在する DG において,計算結果の信頼性を保証する手法である,信頼度に基づく多数決法の拡張を行う.本手法では,各ワーカの信頼性 (信頼度) を条件付き確率として計算することで,計算結果の誤り率を常に許容値以下に抑えることが可能であるが,この際, 「全ワーカの性能が同じ」 であることを前提としていた.そこで本稿では,各ワーカの性能が異なり,かつ,その性能が未知であるといった,より実環境に近い状況を想定して,信頼度計算式の拡張を行う.最悪ケースを想定した,妨害者の性能が非妨害者よりも 10 倍高い場合などのシミュレーション結果から,拡張した計算式を用いることで,誤り率を常に許容値以下に収められることを確認した.To efficiently improve the sabotage-tolerance of Desktop Grid (DG) systems, credibility-based voting method is proposed. Assuming that every worker has the same performance, this method can guarantee the condition that the error rate is less than the specified accep