Faculty Profiles - FUNABIKI Nobuo

MISC - FUNABIKI Nobuo

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Research on Making of Electronic Whiteboard Secure

YASUKAWA Yukihiro, KOUMOTO Takuya, FUNABIKI Nobuo, SUGIYAMA Yuji

IEICE technical report 106 ( 263 ) 7 - 12 2006.9

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

It is not easy to see the screen from the back seat at conference with commodious room. To solve this problem, an electronic whiteboard system using the IP multicast communication can be used, but an existing system has the problem concerning security. In this research, an existing whiteboard system is made secure and extended to a practicable whiteboard. The whiteboard system is introduced into an actual conference, and effectiveness is shown by the questionnaire from users.

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8-107 Development and Management of an WEB-based Educational Activity Support System "NOBASU" : For unification of education and research activities in university

FUNABIKI Nobuo, NAGAO Noriaki, NAGATA Yoshinori, BABA Shota

18 152 - 153 2006.7

A design method for a multiplexed hierarchical logical topology to balance communication loads for multi-hop WDM networks and its routing algorithm

KITANI Tomoya, FUNABIKI Nobuo, HIGASHINO Teruo

IEICE technical report 106 ( 117 ) 13 - 16 2006.6

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

In this paper, we propose a hierarchical topology and its routing algorithm to achieve traffic balancing. In a hierarchical topology, traffic concentrates on the link of high-level layers. Thus, we make the node group in the lowest level layer as a cluster, and set the links hierarchically between nodes as well as a high-level layer. By using these links, traffic is relaid to a far away node via the nodes in the low-level layer. We also propose the routing algorithm of this topology.

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An Improvement of License Plate Recognition Algorithm Considering Image Brightness and Character Arrangements

SHINOHARA Yosuke, KAWASHIMA Jun, FUNABIKI Nobuo

IEICE technical report 105 ( 534 ) 7 - 12 2006.1

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

The automatic recognition of characters and numbers on license plates for vehicles is very important for various applications such as vehicle managements in parking lots, automatic fare collections in toll roads, traffic flow measurements and congestion surveillance on roads, and identifications of illegal parking vehicles on streets. In this paper, we propose an improvement of the license number plate recognition algorithm by improving the binarization process and the character recognition area process that are the keys determining the recognition accuracy. In the former process, the histogram of pixel brightness obtained from the input image is classified into three patterns according to the shape, and the different thresholds are used in each pattern. In the latter process, extractions of noisy character regions are enabled by extrapolating them from successfully extracted regions using their relative positions. The effectiveness of our proposal is verified by applications to sample license images.

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無線メッシュネットワークにおけるゲートウェイ用アクセスポイント選択問題

田島

第3回アドホックネットワークワークショップ, Jan. 2006 2006

最大重みクリーク問題に対する局所探索法

片山謙吾, 濱本明宏, 貞松政史, 成久洋之, 南原英生, 舩曵信生

電子情報通信学会論文誌A 2006

メモリカードのためのセキュアファイルシステムSASの提案と実装

川島潤, 舩曵信生, 中西透, 竹内順一, 石崎雅幸, Andre Caldas de Souza

情報処理学会論文誌 2006

プライバシを保護した授業評価アンケートの実装

谷川浩司, 中西透, 舩曵信生

電子情報通信学会技術研究報告 2006

VNCプロクシのネットワーク負荷分散性能の評価

松本康平, 籠谷裕人, 甲本卓也, 舩曵信生

電子情報通信学会技術研究報告 2006

A proposal of anonymous IEEE802.IX authentication protocol for wireless networks

Nobuo Funabiki, Toru Nakanishi, Hideo Takahashi, Kouhei Miki, Jun Kawashima

2006 SECOND WORKSHOP ON SECURE NETWORK PROTOCOLS (NPSEC) 26 - + 2006

Language：English Publisher：IEEE

Recently, wireless network services are available at a variety of public spaces such as stations, airports, and hotels. In such services, the IEEE802.1X-based authentication protocol has been often used to permit only registered users in network connections. However, this protocol allows Internet service providers (ISPs) to collect the privacy information of users such as their access locations and network service use records. Besides, ISPs have to keep in secret the personal information of their users for authentication, although they only need the legitimacy of them. To solve these problems. this paper presents an anonymous authentication protocol based on IEEE802.1X. The group signature scheme is adopted to anonymously verify the legitimacy of users, whereas misbehaving users can be traced in case. We implement the proposed protocol by modifying open source soft-wares for IEEE802.1X and verify the effectiveness in terms of the processing time and the packet size.

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デジタル紙芝居システムのための配信経路生成アルゴリズムの提案

毛利亜紀, 篠原陽介, 舩曵信生, 中西透

電子情報通信学会技術研究報告 2006

An optimal access-point allocation for wireless infrastrcuture mesh netwroks

Nobuo Funabiki, Toru Nakanishi, Yohei Nomura, Tamer Farag, Shigeto Tajima, Teruo Higashino

Proc. of 16th International Conference on Computer Theory and Applications 2006

無線メッシュネットワークのアクセスポイント間通信での優先度制御に関する一検討

野村洋平, 新田友里子, 田島滋人, 舩曵信生, 中西透

電子情報通信学会技術研究報告 2006

無線メッシュネットワークでの帯域測定実験とその考察

加藤秀明, 野村洋平, 舩曵信生, 中西透

電子情報通信学会技術研究報告 2006

無線メッシュネットワークにおけるアクセスポイントのチャネル割当アルゴリズムの提案と配置アルゴリズムの評価

野村洋平, 舩曵信生, 中西透

第3回アドホックネットワークワークショップ 2006

An internet gateway access-point selection problem for wireless infrastructure mesh networks

Shigeto Tajima, Teruo Higashino, Nobuo Funabiki, Shoji Yoshida

Proceedings - IEEE International Conference on Mobile Data Management 2006 2006

Language：English

This paper presents a study of the gateway access-point selection problem for the wireless infrastructure mesh network (WIMNET). WIMNET is a wireless mesh network composed of multiple access-points (APs) that communicate mutually using radio transmissions, and all the traffics to/from the Internet go through the limited number of gateway APs. Thus, the selection of these gateway APs often determines the whole performance of WIMNET, because heavy congestions at gateway APs and their peripheries can drastically increase the delay and the link failure due to radio interferences. In this paper, we define a cost function to minimize the total traffic in WIMNET in order to reduce congestions and present a simple algorithm. Through simulations using the newly developed WIMNET simulator, we show the effectiveness of our approach. © 2006 IEEE.

DOI： 10.1109/MDM.2006.36

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WDMリングネットワークのノード構成問題の一般化

磯貝愛, 舩曵信生, 中西透

電子情報通信学会技術研究報告 2006

A LECCS model parameter optimization algorithm for EMC designs of IC/LSI systems

Nobuo Funabiki, Yohei Nomura, Jun Kawashima, Yuichiro Minamisawa, Osami Wada

2006 17TH INTERNATIONAL ZURICH SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY, VOLS 1 AND 2 304 - + 2006

Language：English Publisher：IEEE

In this paper, we propose a parameter optimization algorithm for EMC macro-modeling of IC/LSI power currents called the LECCS (Linear Equivalent Circuit and Current Source) model. The unnecessary electro-magnetic wave from a digital electronics device may cause the electromagnetic interference (EMI) to other apparatus. Thus, its reduction has been regarded as one of the highest priority issues in digital electronics device designs. In order to accurately simulate high-frequency currents from power-supply sources that are the primary sources of EMI, the LECCS model has been proposed as a linear macro-model of a power-supply circuit. A LECCS model consists of multiple RLC-series circuits in parallel to represent the equivalent circuit between the voltage source and the ground. Given a set of measured impedances at various frequencies, our proposed algorithm first finds the number of RLC-series circuits corresponding to the number of valleys. Then, it searches optimal values of RLC parameters by a local search method. The effectiveness of our algorithm is verified through applications to a real system, where the accuracy and the required processing time by our algorithm are compared with the conventional method.

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WEBによる教育支援システム"NOBASU"での課題プログラム評価

馬場章太, 長尾憲暁, 中西透, 舩曵信生

情報処理学会研究報告 2006

VNCにおける負荷分散と操作権限制御を目的としたプロクシの提案

松本康平, 籠谷裕人, 甲本卓也, 舩曵信生

電子情報通信学会技術研究報告 2006

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