Faculty Profiles - FUNABIKI Nobuo

MISC - FUNABIKI Nobuo

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An accessibility improvement in the Web-page layout optimization method for adapting to browsing size

ISOGAI Megumi, FUNABIKI Nobuo, NAKANISHI Toru

IEICE technical report 109 ( 160 ) 81 - 86 2009.7

A Proposal of an Educational-support System for Java Programming Using the Test-driven Development Method

MATSUSHIMA Yukiko, KASAI Yasuhiro, FUNABIKI Nobuo, NAKANISHI Toru, AMANO Noriki

IEICE technical report 109 ( 82 ) 7 - 12 2009.6

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

This paper presents an educational-support system for Java programming using the test-driven development method, with the goals of reducing the teacher load in evaluating program codes submitted from students and giving corrections and comments to them, and improving the student learning environments. To achieve our goals, this system adopts a Java program verification tool called JUnit, and can generate the test code to verify the student codes from the model code to the assignment made by the teacher in a semi-automatic way. By providing the test code to students as the code specification in the assignment, the verification accuracy is enhanced with reduction of the ambiguity in code implementations. The questionnaire results from both teachers and students confirm the effectiveness of the proposed system in the Java programming education.

An Implementation of a Group Signature Scheme with Efficient Verifier-Local Revocation Check

SUDARSONO Amang, NAKANISHI Toru, SAKEMI Yumi, NOGAMI Yasuyuki, FUNABIKI Nobuo

IEICE technical report 109 ( 42 ) 37 - 42 2009.5

Language：English Publisher：The Institute of Electronics, Information and Communication Engineers

A group signature scheme with efficient verifier-local revocation check has been proposed. This scheme provides a more efficient revocation check, using the multi-pairing technique for a product of pairings. However, this scheme has not been implemented and evaluated. This paper presents an implementation of the group signature scheme and the experimental results.

A Generalized Access Point Allocation Algorithm for Wireless Mesh Networks in Indoor Environments

FARAG Tamer, FUNABIKI Nobuo, NAKANISHI Toru

IEICE technical report 109 ( 36 ) 31 - 36 2009.5

Language：English Publisher：The Institute of Electronics, Information and Communication Engineers

Previously, we have proposed an access point (AP) allocation algorithm in indoor environments for the Wireless Internet-access Mesh NETwork (WIMNET) with one gateway (GW) to the Internet. WIMNET is composed of multiple APs that are connected with wireless links, mainly using the wireless distribution system (WDS). In this paper, we generalize this algorithm to handle multiple GWs in the field that are essential for the large scale WIMNET. The generalized algorithm first divides the rooms in the network field into a set of GW clusters by two steps, initial greedy clustering and clustering search improvement. Where the APs allocated in the rooms of the same cluster are connected to the same GW. Then, the previous AP allocation algorithm is applied to the rooms in each cluster sequentially. The effectiveness of our proposal is verified through extensive simulations using the WIMNET simulator.

Dependability Extensions of the Access Point Allocation Algorithm for Wireless Mesh Networks

HASSAN Walaa, FARAG Tamer, FUNABIKI Nobuo, NAKANISHI Toru

IEICE technical report 109 ( 36 ) 37 - 42 2009.5

Language：English Publisher：The Institute of Electronics, Information and Communication Engineers

As a scalable, flexible, and inexpensive network, we have studied the wireless Internet-access mesh network (WIMNET) that is composed of multiple access points (APs) connected by the wireless distribution system (WDS). WIMNET may suffer from failures of links or APs due to hardware faults or network environmental changes. In this paper, we propose dependability extensions to link/AP faults of the AP allocation algorithm for WIMNET in indoor environments that has been proposed by our group. The extended algorithm finds AP allocations where even if one link/AP is failed, the connectivity of the APs is maintained, while seeking the minimization of the number of additional APs and the maximization of the performance. The effectiveness of our proposal is verified through simulations using the WIMNET simulator.

An Access Point Allocation Algorithm for Indoor Environments in Wireless Mesh Networks

Tamer Farag, Nobuo Funabiki, Toru Nakanishi

IEICE TRANSACTIONS ON COMMUNICATIONS E92B ( 3 ) 784 - 793 2009.3

Language：English Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG

As a flexible, cost effective solution for a large-scale access network to the Internet, we have studied the design optimization of the Wireless Internet-access Mesh NETwork (WIMNET). WIMNET consists of multiple access points (APs) that have wireless links between them mainly on the wireless distribution system (WDS). In WIMNET, the links around the Internet gateway can be bottlenecks because every packet passes through it after multihop link activations. Besides, the link quality may be degraded by obstacles in indoor environments. Thus, the proper allocation of APs is essential in WIMNET, so that the communication quality should be ensured while the installation and management cost be minimized. In this paper, we formulate this AP allocation problem for indoor environments in WIMNET with the proof of the NP-completeness of its decision version. Then, we present its two-stage heuristic algorithm composed of the initial greedy allocation and the iterative improvement. The effectiveness of our proposal is verified through extensive simulations in three indoor environments.

DOI： 10.1587/transcom.E92.B.784

An Online Check Function of Writing Style in the Learning Management System "NOBASU"

KAWANO Hiroki, FUNABIKI Nobuo, NAKANISHI Toru, AMANO Noriki

IEICE technical report 108 ( 470 ) 169 - 174 2009.2

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Our research group has developed an original Learning Management System (LMS) named NOBASU to improve educational services to students in our department. This paper presents an online check function of writing style on NOBASU. This function checks the writing styles of "Rhetoric", "Report Length" and "Keywords" in students' reports, and quickly provides results to them. The latest list of frequently used words selected from all submitted reports are also shown. To evaluate efficiency of this function, we implemented and applied it to a lecture in our department. According to the questionnaire survey, we found the effectiveness for students in learning writing styles.

A WEB Database System for Managing Open Source Software Installation Manuals

MURAKAMI Yukikazu, KAN Etsu, FUNABIKI Nobuo, NAKANISHI Toru, TOKUNAGA Hidekazu, SHIGETA Kazuhiro

IEICE technical report 108 ( 470 ) 163 - 168 2009.2

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Recently, the Open Source Software (OSS) has become used at many places. However, the use of an OSS is hard for its novice users, because many OSSes have few good manuals, and the installation of an OSS package sometimes requires installations of multiple OSS packages to be integrated together. To solve this problem, we have proposed a method of automatically generating a WEB manual for installing an OSS by editing the log information recorded during the installation process by a skilled user. This method has a problem of requiring different manuals even for the same OSS, because installation commands may be different depending on the OS distribution for the PC and the OS/OSS versions. It is impossible to create all the manuals to cover any difference. In this paper, we propose a WEB database system for managing installation manuals so that skilled OSS users can easily upload new manuals for OSSes with new versions, and the similar manual display function after investigating differences of installation commands under different OS/OSS versions and OS distributions.

Improvements in the WDS Clustering Algorithm for Wireless Internet-access Mesh Networks

TAJIMA Shigeto, FUNABIKI Nobuo, HIGASHINO Teruo

IEICE technical report 108 ( 457 ) 343 - 348 2009.2

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

We have studied the Wireless Internet-access Mesh NETwork (WIMNET) as a large-scale multihop wireless network using Wireless Distribution System (WDS) for Internet access network. We have proposed the heuristic algorithm for the WDS clustering problem to achieve the scalable WIMNET. In this paper, we propose the four improvements of our algorithm; 1) consideration of total hop counts and total interferences in the cost function, 2) random selection of starting APs, 3) modification of the cost function for the gateway AP selection, and 4) consideration of interferences for the route selection. Through simulations using two types of network topologies, we verify the effectiveness of these improvements.

A Multi-Server Video Encoding System Using Divided Video Files at Scene Changes

OKADA Genya, FUNABIKI Nobuo, NAKANISHI Toru

IEICE technical report 108 ( 392 ) 79 - 82 2009.1

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Recently, with spread of high-performance personal computers and broadband networks, the use of video contents has become popular. As a result, the fast encoding process of video files is very important to improve the convenience of video contents. In this paper, we present a multi-server video encoding system to speed up the encoding process by dividing one video file into multiple fragments and encoding them in parallel using multiple servers. To improve the quality of the reunited video file, we divide the source video file at scene changes of the content. We have implemented the proposed system, and confirmed that our system using three servers can reduce the encoding process time into the half of the single server case.

A Proposal of an Web Page Layout Optimization Method for Various Browser Sizes

ISSHIKI Yosuke, FUNABIKI Nobuo, NAKANISHI Toru, ISOGAI Megumi

IEICE technical report 108 ( 392 ) 83 - 88 2009.1

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Recently, the opportunity of Web browsing using terminals with various sizes has increased due to the development of a variety of terminals. Unfortunately, most Web pages have been designed to be fit to terminals with the standard size. As a result, the screen scroll operation is necessary to access the main content at a small-size terminal, whereas the blank space becomes large at a large-size terminal. In this paper, we focus on the separation of the document structure description by an XHTML file and the appearance description by a CSS file. Then, we propose a method of delivering the Web page layout fit to the browsing size. This method first generates the CSS file fit to each size automatically from the Web page files that have been produced by a user for the standard size. Then, it dynamically changes the CSS file using JavaScript. We confirm the effectiveness of our proposal at various sizes by generating an Web page using this method.

スケーラブル無線メッシュネットワークのための通信路構成最適化アルゴリズム

上村香菜子, 舩曵信生, 中西透

スケーラブル無線メッシュネットワークのための通信路構成最適化アルゴリズム J92-B ( 9 ) 1526 - 1537 2009

A web-based lecture scene playback system using digital picture-card show with structured learning assistance function

Aki Mouri, Nobuo Funabiki, Toru Nakanishi

INTERNATIONAL JOURNAL OF WEB AND GRID SERVICES 5 ( 4 ) 372 - 389 2009

Language：English Publisher：INDERSCIENCE ENTERPRISES LTD

Computer-aided slide presentations have become common at lectures in universities. To improve the educational quality, this paper presents it Web-based lecture scene playback system using the digital picture-card show with the structured learning, assistance function. Fine still images of lecture scenes are periodically taken by a digital camera, and the lecturer voice is recorded by a personal computer, which are edited to produce the digital picture-card show. The structured learning assistance function classifies the picture cards representing the slides containing each important concept into five structures, and generates their links. The system was applied to freshman courses in our department where questionnaire results confirmed the effectiveness.

DOI： 10.1504/IJWGS.2009.030265

An implementation of writing style check function in learning management system “NOBASU”

Hiroki Kawano, Nobuo Funabiki, Toru Nakanishi, Noriki Amano

An implementation of writing style check function in learning management system “NOBASU” 227 - 228 2009

A Heuristic Optimization Algorithm for Panoramic Image Generation Problem from Multiple Cameras

Megumi Isogai, Nobuo Funabiki, Toru Nakanishi

EMERGING INTELLIGENT COMPUTING TECHNOLOGY AND APPLICATIONS, PROCEEDINGS 5754 297 - 306 2009

Language：English Publisher：SPRINGER-VERLAG BERLIN

Recently, a panoramic image has been expected in various applications due to the advantage of expressing a wide range of scenes by one image. In this paper, we propose a heuristic optimization algorithm for the panoramic image generation problem from multiple cameras. Our-three-stage algorithm composed of the approximate calibration, the detailed calibration, and the image synthesis, transforms the images of the side cameras to be fit to the image of the central camera as best as possible. The image parameters are optimized by a local search method with a. Tabu period as a typical heuristic optimization method. Through experiments, we show the effectiveness of our proposal.

DOI： 10.1007/978-3-642-04070-2_34

An Implementation of Anonymous Authentication System for Web Services Using Proxies

Toru Nakanishi, Hiroki Obayashi, Nobuo Funabiki

ISCE: 2009 IEEE 13TH INTERNATIONAL SYMPOSIUM ON CONSUMER ELECTRONICS, VOLS 1 AND 2 121 - 123 2009

Language：English Publisher：IEEE

This paper shows an implementation of the anonymous authentication system for Web services. This system uses privacy-enhancing digital signatures, called group signatures, which allow the user to be anonymously authenticated. Since the adopted group signature scheme utilizes novel cryptographic algorithms, the simple introduction or the authentication to the Web browsers and servers needs modifications of them. Thus, we use proxies in our implementation to avoid the modifications. We show that the authentication time is practical by the experiments.

DOI： 10.1109/ISCE.2009.5156831

Revocable Group Signature Schemes with Constant Costs for Signing and Verifying

Toru Nakanishi, Hiroki Fujii, Yuta Hira, Nobuo Funabiki

PUBLIC KEY CRYPTOGRAPHY-PKC 2009, PROCEEDINGS 5443 463 - 480 2009

Language：English Publisher：SPRINGER-VERLAG BERLIN

Lots of revocable group signature schemes have been proposed so far. In one type of revocable schemes, signing and/or verifying algorithms have O(N) or O(R) complexity, where N is the group size and It is the number of revoked members. On the other hand, in Camenisch-Lysyanskaya scheme and the followers, signing and verifying algorithms have O(1) complexity. However, before signing, updates of the secret key are required. The complexity is O(R) in the worst case. In this paper, we propose a revocable scheme with signing and verifying of O(1) complexity, where no updates of secret key are required. The compensation is the long public key of O(N). In addition, we extend it to the scheme with O(root N)-size public key, where signing and verifying have constant extra costs.

DOI： 10.1007/978-3-642-00468-1_26

A Proposal of Structured Learning Assistance Function in Lecture-Scene Playback System Using Digital Picture-Card Show

Nobuo Funabiki, Aki Mouri, Kanako Uemura, Toru Nakanishi

CISIS: 2009 INTERNATIONAL CONFERENCE ON COMPLEX, INTELLIGENT AND SOFTWARE INTENSIVE SYSTEMS, VOLS 1 AND 2 983 - 988 2009

Authorship：Lead author Language：English Publisher：IEEE

The Web-based lecture-scene playback system using the digital picture-card show has been studied to improve the educational quality of lectures with computer-aided slide presentations in universities. In this system, fine still images of lecture scenes, containing the lecturer the blackboard, and the presentation screen, are periodically taken by a commercial digital photo camera, and the lecturer voice is recorded into a digital file by a personal computer during a class. Then, the digital picture-card show to play back the lecture scenes is edited by selecting one image and the voice file section corresponding to one lecture scene that is defined as the time span of teaching one slide page by the lecturer The picture-card show is delivered to students through the World-Wide Web system on demand. In this paper we propose the structured learning assistance function for this lecture-scene playback system, so that students can study important technical concepts in the lecture structurally This function classifies the lecture scenes corresponding to one concept into five structures, and generates the links between them automatically. Through applications to one course for freshmen in our department, we show the effectiveness of our proposal.

DOI： 10.1109/CISIS.2009.103

操作ログを用いたオープンソースソフトウエアのインストールマニュアル自動生成法の提案

村上幸一, 舩曵信生, 徳永秀和, 重田和弘, 中西透

情報処理学会論文誌 50 ( 3 ) 926 - 939 2009

A web-based installation manual management system for open source software

Yukikazu Murakami, Nobuo Funabiki, Hidekazu Tokunaga, Kazuhiro Shigeta, Toru Nakanishi

NCM 2009 - 5th International Joint Conference on INC, IMS, and IDC 1261 - 1266 2009

Language：English

Recently, Open Source Software (OSS) has become commonly used at many places. Unfortunately, although the use of OSS is often hard for novice users, many OSSes have few good manuals. To solve this problem, we have proposed a method of automatically generating a Web-based installation manual for an OSS by editing the log information recorded during the installation process by a skilled user. However, this method has another problem of requiring several manuals even for the same OSS, because installation commands may be different depending on the installation environment such as Linux distributions and versions. In addition, novice users sometimes make input mistakes during installation process that cannot be detected by themselves. In this paper, we propose a Web-based system to manage the created manuals so that users can easily use them. By incorporating the analogous manual search algorithm after investigating command changes under different environments, our system is able to show similar manuals if no existing manual matches to the search condition. Besides, we propose the installation guidance function to avoid mistakes by users. It monitors the input commands by a user, and displays the correct commands with the error message if a mistake is found. The experimental results in installing OSS packages by novice users confirm the effectiveness our proposal. © 2009 IEEE.

DOI： 10.1109/NCM.2009.183

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