Updated on 2025/09/30

写真a

 
YOKOHIRA Tokumi
 
Organization
Faculty of Interdisciplinary Science and Engineering in Health Systems Professor
Position
Professor
External link

Degree

  • Doctor of Engineering ( Osaka University )

Research Interests

  • Communication Protocols

  • Edge Computing

  • Fault Tolerant Networks

  • Cloud Computing

  • Computer Networks

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Communication and network engineering

  • Informatics / Theory of informatics

Education

  • Osaka University   大学院基礎工学研究科   物理系専攻 博士後期課程

    1986.4 - 1989.3

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    Country: Japan

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  • Osaka University   大学院基礎工学研究科   物理系専攻 博士前期課程

    1984.4 - 1986.3

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    Country: Japan

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  • Osaka University   基礎工学部   情報工学科

    1980.4 - 1984.3

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    Country: Japan

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Research History

  • Okayama University   The Graduate School of Interdisciplinary Science and Engineering in Health Systems   Professsor

    2021.4

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    Country:Japan

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  • Okayama University   Division of Interdisciplinary Science and Engineering in Health Systems, The Graduate School of Interdisciplinary Science and Engineering in Health Systems   Professor

    2018.4 - 2021.3

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    Country:Japan

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  • Okayama University   Division of Medical Bioengineering, The Graduate School of Natural Science and Technology   Professor

    2015.4 - 2018.3

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    Country:Japan

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  • Okayama University   Division of Industrial Innovation Sciences, The Graduate School of Natural Science and Technology,   Professor

    2005.4 - 2015.3

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    Country:Japan

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  • Okayama University   Department of Communication Network Engineering, Faculty of Engineering   Professor

    2003.7 - 2005.3

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    Country:Japan

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  • Okayama University   Department of Communication Network Engineering, Faculty of Engineering   Associate Professor

    2000.4 - 2003.6

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    Country:Japan

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  • Okayama University   Department of Information Technology, Faculty of Engineering   Associate Professor

    1994.12 - 2000.3

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  • Okayama University   Department of Information Technology, Faculty of Engineering   Senior Assistant Professor

    1990.5 - 1994.11

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  • Okayama University   Department of Information Technology, Faculty of Engineering   Assistant Professor

    1989.4 - 1990.4

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Professional Memberships

 

Papers

  • Performance Improvement of a Virtual Network Embedding Algorithm based on Temporal-difference Learning by Resource-Constraint-Aware Candidate Solution Selection

    Yukinobu Fukushima, Yuta Sagawa, Yuya Tarutani, Tokumi Yokohira

    IEIE Transactions on Smart Processing and Computing   13 ( 2 )   158 - 166   2024

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.5573/IEIESPC.2024.13.2.158

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  • A Protection Scheme with Speech Processing against Audio Adversarial Examples

    Yuya Tarutani, Taisei Yamamoto, Yukinobu Fukushima, Tokumi Yokohira

    IEEE Access   1 - 1   2024

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    Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/access.2024.3467224

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  • Statistical Analysis of Effectiveness of Cross-Disciplinary Team’s Practice in Engineering Project Based Learning

    Masaya MIKAMI, Takahiro HIWAKI, Yoshihiro HAGIHARA, Yuya TARUTANI, Tokumi YOKOHIRA

    Journal of JSEE   71 ( 2 )   2_14 - 2_20   2023

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    Publishing type:Research paper (scientific journal)   Publisher:Japanese Society for Engineering Education  

    DOI: 10.4307/jsee.71.2_14

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  • An Improvement of an IP Fast Reroute Method Using Multiple Routing Tables Reviewed

    Yuya Tarutani, Masashi Ishigai, Naoto Numata, Yukinobu Fukushima, Tokumi Yokohira

    Journal of Internet Technology   23 ( 6 )   1315 - 1324   2022.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Angle Publishing Co., Ltd.  

    <p>The demand for high Internet availability has increased. As a routing method to recover fast from a single network component (link or node) failure, a method using multiple routing tables has been proposed. In the method, when a component failure occurs, packets which are supposed to pass through the component in the failure free state are rerouted using a backup routing table (backup table: BT) which does not use the component. Thus, it is important to decrease the increased routing cost, and because the method uses multiple BTs, it is also important to decrease the numbers of entries in BTs. In this paper, we propose a new routing method to decrease the increased routing cost. In the conventional method, there are many components that do not fail but are not used for packet forwarding in a BT. In our proposed method, we use such components as much as possible to decrease the increased routing cost. About the decreasing of the numbers of entries in BTs, we simulate packet forwarding for every node-pair and find unnecessary entries which are not used in packet forwarding in any node-pair. Numerical examples show that our proposed method is superior to the conventional method. </p><p> </p>

    DOI: 10.53106/160792642022112306014

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  • Consensus Building using Deep Reinforcement Learning for Energy Management

    Yuya Tarutani, Isato Oishi, Yukinobu Fukushima, Tokumi Yokohira

    IEIE Transactions on Smart Processing & Computing   11 ( 4 )   284 - 291   2022.8

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    Publishing type:Research paper (scientific journal)   Publisher:The Institute of Electronics Engineers of Korea  

    DOI: 10.5573/ieiespc.2022.11.4.284

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  • Minimizing the monetary penalty and energy cost of server migration service

    Yukinobu Fukushima, Tatsuya Suda, Tutomu Murase, Yuya Tarutani, Tokumi Yokohira

    Transactions on Emerging Telecommunications Technologies   2022

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/ett.4511

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  • Throughput Fairness in Congestion Control of Multipath TCP.

    Yu Deguchi, Aoshi Kobayashi, Yuya Tarutani, Yukinobu Fukushima, Tokumi Yokohira

    ICTC   123 - 126   2022

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/ICTC55196.2022.9952427

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    Other Link: https://dblp.uni-trier.de/db/conf/ictc/ictc2022.html#DeguchiKTFY22

  • A Secret Sharing Scheme to Reduce the Total Data Size

    Kuniaki Tsuji, Shiden Kishimoto, Yuya Tarutani, Yukinobu Fukushima, Tokumi Yokohira

    2021 International Conference on Information and Communication Technology Convergence (ICTC)   2021.10

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

    DOI: 10.1109/ictc52510.2021.9621088

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  • A Server Migration Method Using Q-Learning with Dimension Reduction in Edge Computing Reviewed

    Ryo Urimoto, Yukinobu Fukushima, Yuya Tarutani, Tutomu Murase, Tokumi Yokohira

    International Conference on Information Networking   2021-January   301 - 304   2021.1

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

    DOI: 10.1109/ICOIN50884.2021.9333965

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    Other Link: https://dblp.uni-trier.de/db/conf/icoin/icoin2021.html#UrimotoFTMY21

  • Proposal of device control method based on consensus building using reinforcement learning Reviewed

    Isato Oishi, Yuya Tarutani, Yukinobu Fukushima, Tokumi Yokohira

    International Conference on Information Networking   2021-January   451 - 456   2021.1

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

    DOI: 10.1109/ICOIN50884.2021.9333958

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    Other Link: https://dblp.uni-trier.de/db/conf/icoin/icoin2021.html#OishiTFY21

  • An IP Fast Reroute Method against Multiple Node Failures Reviewed

    Naoto Numata, Masashi Ishigai, Yuya Tarutani, Yukinobu Fukushima, Tokumi Yokohira

    International Conference on ICT Convergence   2020-October   714 - 719   2020.10

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

    DOI: 10.1109/ICTC49870.2020.9289623

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    Other Link: https://dblp.uni-trier.de/db/conf/ictc/ictc2020.html#NumataITFY20

  • Performance Evaluation of Feature Encoding Methods in Network Traffic Prediction Using Recurrent Neural Networks Reviewed

    Yusuke Tokuyama, Ryo Miki, Yukinobu Fukushima, Yuya Tarutani, Tokumi Yokohira

    ACM International Conference Proceeding Series   279 - 283   2020.3

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1145/3395245.3396441

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  • A TCP Incast Avoidance Method Based on Retransmission Requests from a Client. Reviewed

    Shiden Kishimoto, Shigeyuki Osada, Yuya Tarutani, Yukinobu Fukushima, Tokumi Yokohira

    2019 International Conference on Information and Communication Technology Convergence(ICTC)   153 - 158   2019

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

    DOI: 10.1109/ICTC46691.2019.8939877

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    Other Link: https://dblp.uni-trier.de/db/conf/ictc/ictc2019.html#KishimotoOTFY19

  • The Effect of Using Attribute Information in Network Traffic Prediction with Deep Learning

    Yusuke Tokuyama, Yukinobu Fukushima, Tokumi Yokohira

    9th International Conference on Information and Communication Technology Convergence: ICT Convergence Powered by Smart Intelligence, ICTC 2018   521 - 525   2018.11

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Institute of Electrical and Electronics Engineers Inc.  

    DOI: 10.1109/ICTC.2018.8539488

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  • Determining Server Locations in Server Migration Service to Minimize Monetary Penalty of Dynamic Server Migration Reviewed

    Yukinobu Fukushima, Tutomu Murase, Gen Motoyoshi, Tokumi Yokohira, Tatsuya Suda

    Journal of Network and Systems Management   26 ( 4 )   1 - 41   2018.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer New York LLC  

    DOI: 10.1007/s10922-018-9451-6

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  • The Effect of Using Attribute Information in Network Traffic Prefdiction with Deep Learning Reviewed

    Yusuke Tokuyama, Yukinobu Fukushima, Tokumi Yokohira

    International Conference on ICT Convergence 2018 (ICTC 2018)   ???-???   2018

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  • Backoff Algorithms to Avoid TCP Incast in Data Center Networks Reviewed

    Shigeyuki Osada, Daichi Izumi, Shiden Kishimoto, Yukinobu Fukushima, Tokumi Yokohira

    International Conference on ICT Convergence 2018 (ICTC 2018)   ???-???   2018

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  • Workplace Capacity Design Using the Minimum Dominating Set in Server Migration Services Reviewed

    Yukinobu Fukushima, Itsuho Goda, Tutomu Murase, Tokumi Yokohira

    The 9th IFIP International Conference on New Technologies, Mobility and Security (NTMS 2018)   ???-???   2018

  • Link Capacity Provisioning and Server Location Decision in Server Migration Service Reviewed

    Yukinobu Fukushima, Tokumi Yokohira, Tutomu Murase

    Proceedings of the 2018 IEEE 7th International Conference on Cloud Networking, CloudNet 2018   ???-???   2018

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/CloudNet.2018.8549545

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  • Improvement of a TCP incast avoidance method using a fine-grained kernel timer Reviewed

    Shigeyuki Osada, Shogo Wakai, Yukinobu Fukushima, Tokumi Yokohira

    International Conference on Information and Communication Technology Convergence: ICT Convergence Technologies Leading the Fourth Industrial Revolution, ICTC 2017   2017-   147 - 152   2017.12

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Institute of Electrical and Electronics Engineers Inc.  

    DOI: 10.1109/ICTC.2017.8190962

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  • A Prototype Virtual Network Embedding System Using OpenStack, Reviewed

    Yukinobu Fukushima, Kohei Sato, Itsuo Goda, Heung-Gyoon Ryu, Tokumi Yokohira

    IEIE Transactions on Smart Processing & Computing   6 ( 1 )   60 - 65   2017

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  • Power-Aware server location decision in server migration service Reviewed

    Yukinobu Fukushima, Tokumi Yokohira, Tutomu Murase, Tatsuya Suda

    2016 International Conference on Information and Communication Technology Convergence, ICTC 2016   150 - 155   2016.11

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    DOI: 10.1109/ICTC.2016.7763457

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  • Modification of an Energy-Efficient Virtual Network Mapping Method for a Load-Dependent Power Consumption Model Reviewed

    Shigeyuki Osada, Ryo Miyayama, Yukinobu Fukushima, Tokumi Yokohira

    WSEAS Transactions on Communications   15   240 - 250   2016

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  • TCP Incast avoidance based on connection serialization in data center networks Reviewed

    Shigeyuki Osada, Ryo Miyayama, Yukinobu Fukushima, Tokumi Yokohira

    International Journal of Computer Networks and Communications   8 ( 4 )   83 - 102   2016

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Academy and Industry Research Collaboration Center (AIRCC)  

    DOI: 10.5121/ijcnc.2016.8406

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  • Prototype Development of a Virtual Network Embedding System Using OpenStack Reviewed

    Itsuho Goda, Kohei Sato, Yukinobu Fukushima, Heung-Gyoon Ryu, Tokumi Yokohira

    The 31st International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2016)   21 - 24   2016

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  • Nonlinearity Sensitivity of FBMC and UFMC Modulation System for the 5G Mobile System Reviewed

    Changyoung An, Heung-Gyoon Ryu, Yukinobu Fukushima, Tokumi Yokohira

    The 31st International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2016)   1 - 4   2016

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  • Performance improvement of an AS-friendly peer selection algorithm for P2P live streaming Reviewed

    Yukinobu Fukushima, Kazuki Kobayashi, Tokumi Yokohira

    International Journal of Computer Networks and Communications   8 ( 1 )   35 - 46   2016

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Academy and Industry Research Collaboration Center (AIRCC)  

    DOI: 10.5121/ijcnc.2016.8103

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  • Load Modulation Based MIMO Communication for the Low Complexity and Low Power Consumption Reviewed

    Changyoung An, Heung-Gyoon Ryu, Seung Hwan Lee, Masahiro Umehira, Tokumi Yokohira

    2016 IEEE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS (ICCE)   558 - 561   2016

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    DOI: 10.1109/ICCE.2016.7430711

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  • Candidate Path Selection Method for TCP Performance Improvement in Fixed Robust Routing Reviewed

    Yukinobu Fukushima, Takashi Matsumura, Kazutaka Urushibara, Tokumi Yokohira

    IEIE Transactions on Smart Processing & Computing   5 ( 6 )   445 - 453   2016

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  • A trail multi-splitting method for throughput improvement in light trail networks Reviewed

    Yukinobu Fukushima, Wenjie Chen, Tokumi Yokohira

    PHOTONIC NETWORK COMMUNICATIONS   30 ( 2 )   178 - 189   2015.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s11107-015-0509-z

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  • Strict application execution control with hierarchical group management using digital certificates on educational windows PCs Reviewed

    Daisuke Okamoto, Keita Kawano, Nariyoshi Yamai, Tokumi Yokohira

    Journal of Information Processing   23 ( 4 )   449 - 457   2015.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Information Processing Society of Japan  

    DOI: 10.2197/ipsjjip.23.449

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  • An On-line Algorithm to Determine the Location of the Server in a Server Migration Service Reviewed

    Yuta Hoshino, Yukinobu Fukushima, Tutomu Murase, Tokumi Yokohira, Tatsuya Suda

    2015 12TH ANNUAL IEEE CONSUMER COMMUNICATIONS AND NETWORKING CONFERENCE   740 - 745   2015

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    DOI: 10.1109/CCNC.2015.7158070

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  • Performance Evaluation of an Energy Efficient Virtual Network Mapping Method-In the case of load-dependent power consumption model- Reviewed

    Yuta Hoshino, Yukinobu Fukushima, Tutomu Murase, Tokumi Yokohira, Tatsuya Suda

    The International Conference on Electronics and Software Science 2015 (ICESS 2015)   134 - 144   2015

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  • A Reroute Method to Recover Fast from Network Failure Reviewed

    Yasuhiro Harada, Wang Hui, Yukinobu Fukushima, Tokumi Yokohira

    2014 INTERNATIONAL CONFERENCE ON INFORMATION AND COMMUNICATION TECHNOLOGY CONVERGENCE (ICTC)   903 - 908   2014

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

    DOI: 10.1109/ICTC.2014.6983329

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  • Optimization of Maximum Timeout Value in TCP with a Fine-grained Timer for Data Center Networks Reviewed

    Ryo Miyayama, Shigeyuki Osada, Yukinobu Fukushima, Tokumi Yokohira

    2014 INTERNATIONAL CONFERENCE ON INFORMATION AND COMMUNICATION TECHNOLOGY CONVERGENCE (ICTC)   433 - 437   2014

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

    DOI: 10.1109/ICTC.2014.6983174

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  • Performance Improvement of SCTP Communication Using Selective Bicasting on Lossy Multihoming Environment Reviewed

    Koki Okamoto, Nariyoshi Yamai, Kiyohiko Okayama, Keita Kawano, Motonori Nakamura, Tokumi Yokohira

    2014 IEEE 38TH ANNUAL INTERNATIONAL COMPUTERS, SOFTWARE AND APPLICATIONS CONFERENCE (COMPSAC)   551 - 557   2014

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

    DOI: 10.1109/COMPSAC.2014.78

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  • Power Efficiency Evaluation of Medium Access Control Methods in Light Trail Networks Reviewed

    Ryo Fukuyama, Yukinobu Fukushima, Tokumi Yokohira

    The 29th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2014)   338 - 341   2014

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  • Performance Evaluation of Overlay Construction Algorithms in Mesh-pull P2P Live Streaming Reviewed

    Yukinobu Fukushima, Tokumi Yokohira

    The 29th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2014)   334 - 337   2014

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  • Power Consumption Evaluation of Light-trail Networks Reviewed

    Yukinobu Fukushima, Tokumi Yokohira

    The 29th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2014)   289 - 292   2014

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  • AS-friendly Peer Selection Algorithm for P2P Live Streaming Reviewed

    Yukinobu Fukushima, Tokumi Yokohira

    International Journal of Multimedia Technology   4 ( 2 )   63 - 73   2014

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  • Throughput Improvement of TCP Proxies in Network Environment with Wireless LANs Reviewed

    Wang Hui, Yukinobu Fukushima, Tokumi Yokohira

    2014 IEEE REGION 10 SYMPOSIUM   82 - 87   2014

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  • Decreasing of the Number of Backup Tables in Multiple Routing Table Method for Fast IP Network Recovery Reviewed

    Daiki Imahama, Yukinobu Fukushima, Tokumi Yokohira

    The 28th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2013)   823 - 826   2013

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  • A Per-burst Traffic Distribution Method for TCP Performance Improvement in Fixed Robust Routing Reviewed

    Yu Sezaki, Yukinobu Fukushima, Takahiro Nabeta, Tokumi Yokohira

    The 28th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2013)   819 - 822   2013

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  • A Multi-splitting Method for Light-trail Networks Reviewed

    Yukinobu Fukushima, Tokumi Yokohira

    The 28th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2013)   803 - 806   2013

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  • A Wavelength and Converter Assignment Scheme using Converter Usage History in Wavelength-Routed Networks Reviewed

    Yukinobu Fukushima, Takahiro Ooishi, Tokumi Yokohira

    International Journal of Computer Networks & Communicationsd   5 ( 4 )   63 - 73   2013

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  • Optimization of Server Locations in Server Migration Service Reviewed

    Yukinobu Fukushima, Tutomu Murase, Tokumi Yokohira, Tatsuya Suda

    The Ninth International Conference on Networking and Services (ICNS 2013)   200 - 206   2013

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  • A Reroute Method Using Multiple Routing Configurations for Fast IP Network Recovery Reviewed

    Daiki Imahama, Yukinobu Fukushima, Tokumi Yokohira

    2013 19TH ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS (APCC): SMART COMMUNICATIONS TO ENHANCE THE QUALITY OF LIFE   433 - 438   2013

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

    DOI: 10.1109/APCC.2013.6765984

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  • TCP Incast Avoidance Based on Connection Serialization in Data Center Networks Reviewed

    Shigeyuki Osada, Kazutoshi Kajita, Yukinobu Fukushima, Tokumi Yokohira

    2013 19TH ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS (APCC): SMART COMMUNICATIONS TO ENHANCE THE QUALITY OF LIFE   142 - 147   2013

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

    DOI: 10.1109/APCC.2013.6765931

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  • Improvement of a TCP Incast Avoidance Method for Data Center Networks Reviewed

    Kazutoshi Kajita, Shigeyuki Osada, Yukinobu Fukushima, Tokumi Yokohira

    2013 INTERNATIONAL CONFERENCE ON ICT CONVERGENCE (ICTC 2013): FUTURE CREATIVE CONVERGENCE TECHNOLOGIES FOR NEW ICT ECOSYSTEMS   460 - 465   2013

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

    DOI: 10.1109/ICTC.2013.6675396

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  • An Architecture and a MAC Protocol for Throughput Improvement in Light Trail Networks Reviewed

    Wenjie Chen, Yukinobu Fukushima, Tokumi Yokohira

    IEICE TRANSACTIONS ON COMMUNICATIONS   E95B ( 7 )   2330 - 2343   2012.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/transcom.E95.B.2330

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  • Throughput Improvement for TCP with a Performance Enhancing Proxy Using a UDP-Like Packet Sending Policy Reviewed

    Hui Wang, Yuichi Nishida, Yukinobu Fukushima, Tokumi Yokohira, Zhen Wu

    IEICE TRANSACTIONS ON COMMUNICATIONS   E95B ( 7 )   2344 - 2357   2012.7

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    DOI: 10.1587/transcom.E95.B.2344

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  • Inter-AS Traffic Volume Reduction by Localizing Delivery for P2P Live Streaming Reviewed

    Kazuki Kobayashi, Yukinobu Fukushima, Tokumi Yokohira

    2012 THIRD INTERNATIONAL CONFERENCE ON NETWORKING AND COMPUTING (ICNC 2012)   156 - 161   2012

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

    DOI: 10.1109/ICNC.2012.31

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  • A Solution to Transmission Halting In a New Flow Control Method TCP-fox Reviewed

    Takumi Shinkai, Wang Hui, Hiroyuki Ishihara, Yuichi Nishida, Yukinobu Fukushima, Tokumi Yokohira

    18TH ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS (APCC 2012): GREEN AND SMART COMMUNICATIONS FOR IT INNOVATION   806 - 811   2012

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

    DOI: 10.1109/APCC.2012.6388193

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  • Improvement of an ACK returning method of TCP proxies in network environment with wireless LANs Reviewed

    Naohiro Honda, Wang Hui, Yuichi Nishida, Yukinobu Fukushima, Tokumi Yokohira

    1st IEEE Global Conference on Consumer Electronics 2012, GCCE 2012   704 - 708   2012

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    DOI: 10.1109/GCCE.2012.6379960

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  • Hybrid Fixed Robust Routing Taking Account of TCP Performance Reviewed

    Takahiro Nabeta, Yukinobu Fukushima, Tokumi Yokohira

    The 27th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2012), CD-ROM (4 pages)   2012

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  • Optimal TCP Receive Buffer Size under Packet Loss Environment Reviewed

    Kazutoshi Kajita, Takumi Shinkai, Naohiro Honda, Yukinobu Fukushima, Tokumi Yokohira

    The 27th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2012), CD-ROM (4 pages)   2012

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  • Destination selection algorithm in a server migration service Reviewed

    Asato Yamanaka, Yukinobu Fukushima, Tokumi Yokohira, Tutomu Murase, Tatsuya Suda

    Proceedings of the 7th International Conference on Future Internet Technologies, CFI'12   15 - 20   2012

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    DOI: 10.1145/2377310.2377315

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  • Multi-stage change-point detection scheme for large-scale simultaneous events Reviewed

    Yukinobu Fukushima, Tutomu Murase, Masayoshi Kobayashi, Hiroki Fujiwara, Ryohei Fujimaki, Tokumi Yokohira

    COMPUTER COMMUNICATIONS   34 ( 15 )   1810 - 1821   2011.9

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    DOI: 10.1016/j.comcom.2011.05.001

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  • Optimization of Token Holding Times in Split Light Trail Networks Reviewed

    Wenjie Chen, Yukinobu Fukushima, Tokumi Yokohira

    2011 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE (GLOBECOM 2011)   2011

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    DOI: 10.1109/GLOCOM.2011.6133810

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  • Performance evaluation of TCP over multiple paths in fixed robust routing Reviewed

    Wenjie Chen, Yukinobu Fukushima, Takashi Matsumura, Yuichi Nishida, Tokumi Yokohira

    2011 IEEE International Workshop Technical Committee on Communications Quality and Reliability, CQR 2011   2011

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

    DOI: 10.1109/CQR.2011.5996088

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  • AS-friendly Peer Selection Algorithms without AS Topology Information in P2P Live Streaming Reviewed

    Yukinobu Fukushima, Yin Tao, Kazuya Inada, Tokumi Yokohira

    The Eighth Asia-Pacific Symposium on Information and Telecommunication Technologies (APSITT 2010)   2010

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  • Early Detection of Increasing Traffic with Distributed Traffic Measurement Reviewed

    Yukinobu Fukushima, Mamoru Niboshi, Tutomu Murase, Ryohei Fujimaki, Shunsuke Hirose, Tokumi Yokohira

    TENCON 2010: 2010 IEEE REGION 10 CONFERENCE   809 - 814   2010

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    DOI: 10.1109/TENCON.2010.5686580

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  • Performance Evaluation of Multi-stage Change-point Detection Scheme with Alert Weighting Reviewed

    Mari Nakagawa, Yukinobu Fukushima, Tutomu Murase, Ryohei Fujimaki, Shunsuke Hirose, Tokumi Yokohira

    TENCON 2010: 2010 IEEE REGION 10 CONFERENCE   785 - 790   2010

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    DOI: 10.1109/TENCON.2010.5686586

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  • TCP-fox: A New Flow Control Method for Improving TCP Throughput in Large Bandwidth-Delay Product Networks Reviewed

    Yuichi Nishida, Hiroyuki Ishihara, Wang Hui, Yukinobu Fukushima, Tokumi Yokohira

    International Symposium on Broadband Communication (ISBC) 2010   2010

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  • Performance Evaluation of TCP Proxies in Network Environment Including Wireless LANs Reviewed

    Yuichi Nishida, Wang Hui, Yukinobu Fukushima, Tokumi Yokohira

    The 25th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2010)   1231 - 1234   2010

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  • Performance evaluation of AS-friendly peer selection algorithms for P2P live streaming Reviewed

    Yukinobu Fukushima, Kazuya Inada, Yin Tao, Yasuyuki Fujiwara, Tokumi Yokohira

    2009 15th Asia-Pacific Conference on Communications, APCC 2009   866 - 870   2009

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    DOI: 10.1109/APCC.2009.5375467

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  • A Burst Assembly Methodto Reduce End-to-End Packet Delay in Optical Burst Switching Networks Reviewed

    Yukinobu Fukushima, Wengie Chen, Yasuyuki Fujiwara, Tokumi Yokohira

    WSEAS Transactions on Communications   8 ( 8 )   894 - 903   2009

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  • Dynamic splitting of light trails for increasing throughput in light trail networks Reviewed

    Yukinobu Fukushima, Kota Tanaka, Wenjie Chen, Tokumi Yokohira

    The 24th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2009)   1370 - 1373   2009

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  • Throughput Improvement of TCP using Split-Connection Type Proxies in Network Environment including Wireless LANs Reviewed

    Yuichi Nishida, Wang Hui, Hiroaki Matsumoto, Hiroyuki Ishihara, Tokumi Yokohira, Yukinobu Fukushima

    The 24th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2009   1360 - 1363   2009

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  • Accuracy Improvement of Multi-Stage Change-Point Detection Scheme by Weighting Alerts based on False-Positive Rate Reviewed

    Yukinobu Fukushima, Tutomu Murase, Ryohei Fujimaki, Syunsuke Hirose, Tokumi Yokohira

    CQR: 2009 IEEE INTERNATIONAL WORKSHOP TECHNICAL COMMITTEE AND COMMUNICATIONS QUALITY AND RELIABILITY   29 - +   2009

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  • Performance Evaluation of Medium Access Control Methods in Light Trail Networks Reviewed

    Yukinobu Fukushima, Kota Tanaka, Tokumi Yokohira

    11TH INTERNATIONAL CONFERENCE ON ADVANCED COMMUNICATION TECHNOLOGY, VOLS I-III, PROCEEDINGS,   1421 - 1425   2009

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  • A burst assembly method to reduce end-to-end delay in optical burst switching networks

    Fukushima Yukinobu, Wenjie Chen, Fujiwara Yasuyuki, Tokumi Yokohira

    WSEAS Transactions on Communications   8 ( 8 )   894 - 903   2009

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  • Retransmission control in TCP with a Performance Enhancing Proxy Reviewed

    Yuichi Nishida, Wang Hui, Hiroaki Matsumoto, Tokumi Yokohira, Yukinobu Fukushima

    10TH INTERNATIONAL CONFERENCE ON ADVANCED COMMUNICATION TECHNOLOGY, VOLS I-III   1881 - +   2008

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    DOI: 10.1109/ICACT.2008.4494152

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  • Performance Evaluation of Multi-Stage Change-Point Detection Scheme against DDoS Attacks by Random Scan Worms Reviewed

    Tutomu Murase, Yukinobu Fukushima, Masayoshi Kobayashi, Sakiko Nishimoto, Ryohei Fujimaki, Tokumi Yokohira

    IEEE Communications Society Communications Quality and Reliability Workshop 2008 (CQR 2008)   2008

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  • Performance evaluation of a multi-stage network event detection scheme against DDoS attacks Reviewed

    Tutornu Murase, Yukinobu Fukushima, Masayoshi Kobayashi, Hiroki Fujiwara, Ryohei Fujimaki, Tokumi Yokohira

    2008 7TH ASIA-PACIFIC SYMPOSIUM ON INFORMATION AND TELECOMMUNICATION TECHNOLOGIES   58 - +   2008

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    DOI: 10.1109/APSITT.2008.4653540

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

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

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

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    DOI: 10.1002/scj.10534

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  • Detection of CMOS open node defects by frequency analysis Reviewed

    Hiroyuki Michinishi, Tokumi Yokohira, Takuji Okamoto, Toshifumi Kobayashi, Tsutomu Hondo

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS   E90D ( 3 )   685 - 687   2007.3

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    DOI: 10.1093/ietisy/e90-d.3.685

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  • Effect of premature ACK transmission timing on throughput in TCP with a performance enhancing proxy Reviewed

    Hui Wang, Shigeyuki Osada, Tokumi Yokohira, Kiyohiko Okayama, Nariyoshi Yamai

    IEICE TRANSACTIONS ON COMMUNICATIONS   E90B ( 1 )   31 - 41   2007.1

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    DOI: 10.1093/ietcom/e90-b.1.31

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  • A Wavelength and Converter Assignment Scheme for Decreasing Blocking Probability in Wavelength-Routed Networks Reviewed

    Yukinobu Fukushima, Takahiro Ooishi, Tokumi Yokohira

    The 12th OptoElectronics and Communication Conference and The 16th International Conference on Integrated Optics and Optical Fiber Communication (OECC/IOCC 2007)   454 - 455   2007

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  • Performance evaluation of a multi-stage network event detection scheme for decreasing the false-positive rate for a large number of simultaneous, unknown events Reviewed

    Tutomu Murase, Hiroki Fujiwara, Yukinobu Fukushima, Masayoshi Kobayashi, Tokumi Yokohira

    Proceedings of the Sixth International Conference on Networking, ICN'07   2007

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    DOI: 10.1109/ICN.2007.71

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  • A Throughput Optimization Algorithm for TCP Connections with Different Routes in Long-Delay Satellite Environments Reviewed

    Nobuto Watanabe, Wang Hui, Shigeyuki Osada, Tokumi Yokohira, Yukinobu Fukushima

    The 25th AIAA International Communications Satellite Systems Conference (ICSSC 2007), Paper No. AIAA 2007-3208 in the Conference CD-ROM (12 pages)   2007

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  • High-speed calculation of worst-case link delays in the EDD connection admission control scheme Reviewed

    Tokumi Yokohira, Kiyohiko Okayama

    IEICE TRANSACTIONS ON COMMUNICATIONS   E89B ( 7 )   2012 - 2022   2006.7

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    DOI: 10.1093/ietcom/e89-b.7.2012

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  • Throughput Optimization for TCP with an Active Proxy in Long-Delay Satellite Environments Reviewed

    Wang Hui, Shigeyuki Osada, Tokumi Yokohira, Yukinobu Fukushima, Deng Chaolong, Kiyohiko Okayama, Nariyoshi Yamai

    2006 Joint Conference on Satellite Communications (JC-SAT 2006)   2006

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  • A burst assembly method for decreasing end-to-end packet delays in optical burst switching networks Reviewed

    Yukinobu Fukushima, Tokumi Yokohira, Yasuhiro Noine, Kazuteru Nagahara

    2006 10TH INTERNATIONAL CONFERENCE ON COMMUNICATION TECHNOLOGY, VOLS 1 AND 2, PROCEEDINGS   459 - +   2006

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    DOI: 10.1109/ICCT.2006.341915

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  • Throughput optimization in TCP with a performance enhancing proxy Reviewed

    Shigeyuki Osada, Wang Hui, Tokumi Yokohira, Yukinobu Fukushima, Kiyohiko Okayama, Nariyoshi Yamai

    2006 10TH INTERNATIONAL CONFERENCE ON COMMUNICATION TECHNOLOGY, VOLS 1 AND 2, PROCEEDINGS   392 - +   2006

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    DOI: 10.1109/ICCT.2006.341898

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  • Node placement algorithms in the case that routes are design variables in shuffle-like multihop lightwave networks Reviewed

    T Yokohira, K Okayama

    IEICE TRANSACTIONS ON COMMUNICATIONS   E88B ( 12 )   4578 - 4587   2005.12

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    DOI: 10.1093/ietcom/e88-b.12.4578

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  • Node placement algorithms for shuffle-like packet-switched networks with wavelength-division multiplexing Reviewed

    Tokumi Yokohira, Takuji Okamoto

    Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi)   88 ( 1 )   72 - 81   2005.1

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    DOI: 10.1002/ecja.10184

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  • Performance improvement of TCP using Performance Enhancing Proxies - Effect of premature ACK transmission timing on throughput Reviewed

    Shigeyuki Osada, Tokumi Yokohira, Wang Hui, Kiyohiko Okayama, Nariyoshi Yamai

    APSITT 2005: 6th Asia-Pacific Symposium on Information and Telecommunication Technologies, Proceedings   7 - 12   2005

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  • A multiwindow system for smooth window operations by the combination of drawing-period generation method and display-period generation method Reviewed

    Y Sato, T Yokohira, H Kagotani, T Okamoto, Kayano, I

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS   88 ( 1 )   12 - 23   2005

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  • A framework for mobile agent systems with the capability of preceding and following users Reviewed

    Tokumi Yokohira, Kiyohiko Okayama, Takashi Murakami, Kayo Takarako

    APSITT 2005: 6th Asia-Pacific Symposium on Information and Telecommunication Technologies, Proceedings   89 - 94   2005

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    DOI: 10.1109/APSITT.2005.203636

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  • CMOS floating gate defect detection using supply current test with DC power supply superposed by AC component Reviewed

    H Michinishi, T Yokohira, T Okamoto, T Kobayashi, T Hondo

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS   E87D ( 3 )   551 - 556   2004.3

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  • Improvement of detectability for CMOS floating gate defects in supply current test Reviewed

    H Michinishi, T Yokohira, T Okamoto, T Kobayashi, T Hondo

    ATS 2003: 12TH ASIAN TEST SYMPOSIUM, PROCEEDINGS   406 - 409   2003

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    DOI: 10.1109/ATS.2003.1250846

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  • 描画時合成方式と表示時合成方式の併用によるスムーズ操作が可能なマルチウィンドウシステム Reviewed

    佐藤洋一郎, 横平徳美, 籠谷裕人, 岡本卓爾, 茅野功

    電子情報通信学会論文誌   2003

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  • シャッフル型波長分割多重方式パケット交換網におけるノード配置アルゴリズム Reviewed

    横平徳美, 岡本卓爾

    電子情報通信学会論文誌   2003

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  • 双方向マンハッタンストリートネットワークのノード配置問題に対する階層型近似アルゴリズムの提案 Reviewed

    米津政隆, 舩曵信生, 木谷友哉, 横平徳美, 中西透, 東野輝夫

    電子情報通信学会論文誌   2003

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  • A quasi-solution state evolution algorithm for channel assignment problems in cellular networks Reviewed

    N Funabiki, T Nakanishi, T Yokohira, S Tajima, T Higashino

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E85A ( 5 )   977 - 987   2002.5

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  • A Proposal of a Quasi-Solution State Evolution Algorithm for Channel Assignment Problems Reviewed

    N.Funabiki, T.Nakanishi, T.Yokohira, S.Tajima, T.Higashino

    International Conference on Information Networking 2002   2002

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  • CMOS floating gate defect detection using I-DDQ test with DC power supply superposed by AC component Reviewed

    H Michinishi, T Yokohira, T Okamoto, T Kobayashi, T Hondo

    PROCEEDINGS OF THE 11TH ASIAN TEST SYMPOSIUM (ATS 02)   417 - 422   2002

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    DOI: 10.1109/ATS.2002.1181747

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  • EDDコネクション受付制御方式における最悪リンク遅延の高速導出法 Reviewed

    横平徳美, 岡本卓爾

    電子情報通信学会論文誌   2002

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  • 静的及びモバイルマルチキャストルーチング問題に対する最適パス選択解法の提案 Reviewed

    藤井雅和, 舩曵信生, 横平徳美, 田島滋人, 常村和史, 東野輝夫

    電子情報通信学会論文誌   2002

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  • An Optimal Path Selection Algorithm for Static and Mobile Multicast Routing Problems Reviewed

    S.Tajima, M.Fujii, N.Funabiki, T.Yokohira, K.Tsunemura, T.Higashino

    International Conference on Information Networking 2002   2002

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  • A Minimal-state Processing Search Alogorithm for satisfiability problems Reviewed

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

    pp.2769-2774   2001.10

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  • ネットワークのリンクスケジューリングへのグラフ彩色アプローチ Reviewed

    田島滋人, 舩曵信生, 東野輝夫, 横平徳美, 中西透

    電子情報通信学会技術研究報告, COMP2001-71   2001

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  • モバイル・マルチキャストルーティング問題に対する最適パス選択解法の提案 Reviewed

    常村和史, 田島滋人, 藤井雅和, 中田明夫, 横平徳美, 舩曵信生, 東野輝夫

    マルチメディア通信と分散処理ワークショップ講演集   2001

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  • EDDコネクション受付制御方式における遅延余裕の一割当法 - 最悪リンク遅延に比例した割当て - Reviewed

    横平徳美, 岡本卓爾

    電子情報通信学会論文誌   2001

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  • Universal Test Complexity of Field-Programmable Gate Arrays Reviewed

    Tokumi Yokohira

    Proc. Fourth Asian Test Symposium (ATS ''95)   pp.259-265   2000.6

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  • LAN,MANにおける波長分割多重パケット交換網の最適化 Reviewed

    横平徳美, 岡本卓爾

    電子情報通信学会論文誌   2000

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  • Testing for the programming circuit of SRAM-based FPGAs Reviewed

    Hiroyuki Michinishi, Tokumi Yokohira, Takuji Okamoto, Tomoo Inoue, Hideo Fujiwara

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS   E82D ( 6 )   1051 - 1057   1999.6

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  • Quantitative Analysis of Knee-Joint Spasticity by Pendulum Test Reviewed

    Kazuaki Jikuya, Tokumi Yokohira, Takuji Okamoto, Ken Akashi

    Proc. The 4th Asia-Pacific Conference on Medical and Biological Engineering   p.122   1999

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  • ルーチングマトリクスを有するFPGAの配線領域の検査法 Reviewed

    道西博行, 横平徳美, 岡本卓爾

    電子情報通信学会論文誌   Vol.J82-D-I, No.7, pp.916-924   1999

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  • Testing for the programming circuit of SRAM-based FPGAs

    Hiroyuki Michinishi, Tokumi Yokohira, Takuji Okamotq, Tomoo Inoue, Hideo Fujiwara

    IEICE Transactions on Information and Systems   E82-D ( 6 )   1051 - 1057   1999

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  • テーブル参照型FPGAにおける論理ブロックの検査法 Reviewed

    道西博行, 横平徳美, 岡本卓爾, 井上智夫, 藤原秀雄

    電子情報通信学会論文誌   Vol.J79-D-I, No.12, pp.1141-1150   1996.12

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  • A Test Methodology for Interconnect Structures of LUT-based FPGAs Reviewed

    Proceedings of the Fifth Asian Test Symposium   pp.68-74   1996.11

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  • Testing for the Programming Circuit of LUT-Based FPGAs Reviewed

    Hiroyuki Michinishi, Tokumi Yokohira, Takuji Okamoto, Tomoo Inoue, Hideo Fujiwara

    pp.242-247   1996.11

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  • Realization of multiwindow system with high-speed operations of nonrectangular windows Reviewed

    Toshiyuki Maeda, Yoichiro Sato, Tokumi Yokohira, Takuji Okamoto

    Systems and Computers in Japan   27 ( 10 )   48 - 58   1996

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    DOI: 10.1002/scj.4690271005

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  • Universal Test Complexity of Field-Programmable Gate Arrays Reviewed

    Tomoo Inoue, Hideo Fujiwara, Hiryouki Michinishi, Tokumi Yokohira, Takuji Okamoto

    Proceeding of the Fourth Asian Test Symposium   pp.259-265   1995.11

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  • The Number of Elements in Minimum Test Set for Locally Exhaustive Testing of Combinational Circuit with Five Outputs Reviewed

    Tokumi Yokohira, Toshimi Shimizu, Hiroyuki Michinishi, Yuuji Suigyama, Takuji Okamoto

    Vol.E78-D, No.7, pp.874-881   1995.7

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  • 非長方形ウィンドウの高速操作機能を備えたマルチウィンドウシステムの実現法 Reviewed

    前田敏行, 佐藤洋一郎, 横平徳美, 岡本卓爾

    電子情報通信学会論文誌   Vol.J78-D-I, No.6, pp.509-518   1995.6

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  • 痙縮患者を対象としたペンドラムテストモデルの精度改善 Reviewed

    軸屋和明, 岡本卓爾, 横平徳美, 明石謙

    電子情報通信学会論文誌   Vol.J78-D-II, No.4, pp.650-660   1995.4

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  • DESIGN ALGORITHM FOR PACKET-SWITCHING NETWORKS WITH DIFFERENT CLASSES OF PACKETS - CAPACITY, PRIORITY, AND FLOW ASSIGNMENT UNDER END-TO-END PACKET DELAY CONSTRAINT Reviewed

    M SUGANO, H TAKASHINA, T YOKOHIRA, T OKAMOTO

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS   78 ( 2 )   1 - 12   1995.2

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  • Minimum Test Set for Locally Exhaustive Testing of Combinational Circuits with Five Outputs Reviewed

    Tokumi Yokohira, Toshimi Shimizu, Hiroyuki Michinishi, Yuuji Sugiyama, Takuji Okamoto

    pp.280-285   1994.11

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  • う回ルーチングを行う分散形交換ネットワークの性能評価 Reviewed

    横平徳美, 滝広眞利, 井上尚子, 岡本卓爾

    電子情報通信学会論文誌   Vol.J77-B-I, No.3, pp.132-140   1994.3

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  • 多出力組合せ論理回路の局所全数テストのための最小テスト集合の生成-M系列発生器とEXORゲートを用いて- Reviewed

    道西博行, 横平徳美, 岡本卓爾

    電子情報通信学会論文誌   Vol.J77-D-I, No.2, pp.233-241   1994.2

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  • 複数クラスのトラヒックをもつパケット交換ネットワ-クの設計アルゴリズム-End-to-End遅延を考慮した容量・優先度・フロ-割当て-

    菅野正嗣,高科宏光,横平徳美,岡本卓爾

    電子情報通信学会論文誌   Vol.J76-B-I, No.12, pp.922-932   1993.12

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  • Proof that Akers'' Algorithm for Locally Exhaustive Testing Gives Minimum Test Sets of Combinational Circuits with up to Four Outputs. Reviewed

    Hiroyuki Michinishi, Tokumi Yokohira and Takuji Okamoto

    Proceedings of the Second Asian Test Symposium   pp.14-19   1993.11

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  • Minimum Test Set for Locally Exhaustive Testing of Multiple Output Combinational Circuits Reviewed

    Hiroyuki Michinishi, Tokumi Yokohira, Takuji Okamoto

    The Transactions of the IEICE   Vol.E76-D, No.7, pp.791-799   1993.7

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  • Minimum Verification Test Set for Combinational Circuits Reviewed

    Proc. First Asian Test Symposium (ATS ''92)   pp.14-19   1992.11

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  • Effect of timeout retransmissions on end‐to‐end delay in packet switching networks Reviewed

    Hiroshi Inai, Tokumi Yokohira, Masayuki Murata, Hideo Miyahara

    Electronics and Communications in Japan (Part I: Communications)   75 ( 7 )   13 - 21   1992

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    DOI: 10.1002/ecja.4410750702

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  • Simulation of Knee Joint Motions in Spastic and Rigid Patients Reviewed

    Kazuaki Jikuya, Takuji Okamoto, Tokumi Yokohira, Ken Akashi

    Proceedings of the XIIIth International Congress on Biomechanics   pp.273-275   1991.12

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  • Fault Tolerant Packet-Switched Network Design and Its Sensitivity Reviewed

    Tokumi Yokohira, Masashi sugano

    IEEE Transactions on Reliability   40 ( 4 )   452 - 460   1991.11

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    DOI: 10.1109/24.93767

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  • プロセッサ制御回路におけるシ-ケンサのテスト集合生成法 Reviewed

    的場和男, 横平徳美, 杉山裕二, 岡本卓爾

    電子情報通信学会論文誌   Vol.J74-D-I, No.10, pp.739-748   1991.10

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  • ペンドラムテストにおける膝関節運動の生成機序 Reviewed

    軸屋和明, 岡本卓爾, 横平徳美, 明石謙

    電子情報通信学会論文誌   J74-D-II, No.9, pp.1289-1300   1991.9

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  • Performance evaluation of layered communication protocol Reviewed

    Hiroshi Inai, Tokumi Yokohira, Masayuki Murata, Hideo Miyahara

    Electronics and Communications in Japan (Part I: Communications)   74 ( 4 )   13 - 25   1991.4

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    DOI: 10.1002/ecja.4410740402

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  • パケット交換網における伝送遅延による再送を考慮に入れた性能評価 Reviewed

    稲井寛, 横平徳美, 村田正幸, 宮原秀夫

    電子情報通信学会論文誌   Vol.J74-B-1, No.4, pp.275-282   1991.4

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  • Decentralized priority encoder and its applications Reviewed

    Toshiyuki Maeda, Yoichiro Sato, Tokumi Yokohira, Takuji Okamoto

    Systems and Computers in Japan   22 ( 10 )   9 - 17   1991

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    DOI: 10.1002/scj.4690221002

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  • Capacity assignment algorithm for packet‐switching network with unreliable links Reviewed

    Tokumi Yokohira, Masashi Sugano, Takeshi Nishida, Hideo Miyahara

    Electronics and Communications in Japan (Part I: Communications)   74 ( 9 )   13 - 20   1991

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    DOI: 10.1002/ecja.4410740902

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  • パケット交換ネットワ-クにおける回線障害を考慮した容量割当て法 Reviewed

    横平徳美,菅野正嗣,西田竹志,宮原秀夫

    電子情報通信学会論文誌   Vol.J73-B-1, No.10, pp.744-750   1990.10

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  • Test Set for a Multibit Shifter Constructed with Multiplexers Reviewed

    Tokumi Yokohira, Hiroyuki Michinishi, Takuji Okamoto, Yuuji, Sugiyama

    The Transactions of the IEICE   Vol.E73, No.8, pp.1301-1309   1990.8

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  • 分散制御形プライオリティエンコ-ダとその応用 Reviewed

    前田敏行,佐藤洋一郎,横平徳美,岡本卓爾

    電子情報通信学会論文誌   Vol.J73-D-I, No.6, pp.545-552   1990.6

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  • 階層型通信プロトコルの性能評価 Reviewed

    稲井寛, 横平徳美, 村田正幸, 宮原秀夫

    電子情報通信学会論文誌   Vol.J73-B-I, No.5, pp.505-515   1990.5

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  • マルチプレクサを用いて構成したシフタの最小テスト集合 Reviewed

    道西博行, 横平徳美, 岡本卓爾, 杉山裕二

    電子情報通信学会論文誌   Vol.J73-D-I, No.5, pp.532-534   1990.5

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  • END-TO-END PERFORMANCE MODELING FOR LAYERED COMMUNICATION PROTOCOL Reviewed

    H INAI, T NISHIDA, T YOKOHIRA, H MIYAHARA

    IEEE INFOCOM 90, VOLS 1-3   pp.442-449   442 - 449   1990

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  • Performance model of layered communication architecture

    Hiroshi Inai, Takeshi Nishida, Tokumi Yokohira, Hideo Miyahara

    Systems and Computers in Japan   21 ( 14 )   32 - 42   1990

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  • 待ち行列網による階層型通信プロトコルの性能評価モデル Reviewed

    稲井寛, 西田竹志, 横平徳美, 宮原秀夫

    電子情報通信学会論文誌   Vol.J72-D-I, No.12, pp.893-901   1989.12

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  • Comparison of stability for various routing-procedures in circuit-switched networks

    Tokumi Yokohira, Hideo Miyahara

    Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi)   72 ( 11 )   43 - 51   1989.11

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  • 大規模計算機システムの性能評価手法とその適用例 Reviewed

    稲井寛, 稲井三重, 村田正幸, 横平徳美, 宮原秀夫

    電子情報通信学会論文誌   Vol.J72-A, No.7, pp.1052-1061   1989.7

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  • 回線交換ネットワ-クにおける種々のル-チング方式の安定性の比較 Reviewed

    横平徳美, 宮原秀夫

    電子情報通信学会論文誌   Vol.J71-B, No.12, pp.1411-1418   1988.12

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  • マルチプログラミングシステムにおけるカタストロフィ-現象の解析 Reviewed

    横平徳美, 宮原秀夫

    電子情報通信学会論文誌   Vol.J71-D, No.6, pp.966-973   1988.6

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  • ANALYSIS OF DYNAMIC BEHAVIOR IN P-PERSISTENT CSMA/CD USING CUSP CATASTROPHE Reviewed

    T YOKOHIRA, T NISHIDA, H MIYAHARA

    COMPUTER NETWORKS AND ISDN SYSTEMS   12 ( 5 )   277 - 289   1986.12

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    DOI: 10.1016/0169-7552(86)90059-0

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MISC

  • Application of a Deep Reinforcement Learning Algorithm to Virtual Machine Migration Control in Multi-Stage Information Processing Systems

    糀谷友貴, 中根和俊, 樽谷優弥, WU Celimuge, JI Yusheng, 横平徳美, 村瀬勉, 福島行信

    電子情報通信学会技術研究報告(Web)   123 ( 398(IN2023 65-113) )   2024

  • Audio Adersarial Example identification method using multiple features

    鈴木大補, 樽谷優弥, 福島行信, 横平徳美

    電子情報通信学会大会講演論文集(CD-ROM)   2024   2024

  • A juvenile leaf growth prediction method using machine learning and image processing

    GAO Sen, 樽谷優弥, 福島行信, 横平徳美

    電子情報通信学会大会講演論文集(CD-ROM)   2024   2024

  • Model Parameter Aggregation Method for Reducing Network Load in Hierarchical Federated Learning

    中村昂平, 福島行信, 樽谷優弥, 横平徳美

    電子情報通信学会技術研究報告(Web)   124 ( 139(IN2024 10-32) )   2024

  • A SECRET SHARING METHOD FOR TOTAL DATA REDUCTION

    辻晋明, 樽谷優弥, 福島行信, 横平徳美

    電子情報通信学会大会講演論文集(CD-ROM)   2022   2022

  • Performance Comparison of TCP Incast Avoidance Methods

    濱田泰誠, 樽谷優弥, 福島行信, 横平徳美

    電子情報通信学会大会講演論文集(CD-ROM)   2022   2022

  • Proposal of equipment control by consensus building considering unknown users

    小形晃平, 樽谷優弥, 福島行信, 横平徳美

    電子情報通信学会大会講演論文集(CD-ROM)   2022   2022

  • Evaluation of an IP Fast Reroute Method for Multiple Failures

    河野貴謙, 樽谷優弥, 福島行信, 横平徳美

    電子情報通信学会大会講演論文集(CD-ROM)   2022   2022

  • Investigation of Throughput Fairness of Multi-path TCP

    出口悠, 樽谷優弥, 福島行信, 横平徳美

    電子情報通信学会大会講演論文集(CD-ROM)   2022   2022

  • Protection method with audio processing against Audio Adversarial Example

    山本泰成, 樽谷優弥, 福島行信, 横平徳美

    電子情報通信学会技術研究報告(Web)   121 ( 66(SP2021 1-23) )   2021

  • A Server Migration Method Using Q learning in Server Migration Service

    瓜本稜, 福島行信, 樽谷優弥, 村瀬勉, 横平徳美

    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

  • 多重ルーティング形態法における対象外故障の迂回可能性の検討

    石外将史, 樽谷優弥, 福島行信, 横平徳美

    情報科学技術フォーラム講演論文集   18th   2019

  • マルチパスTCPのスループット公平性の改善

    泉大地, 樽谷優弥, 福島行信, 横平徳美

    情報科学技術フォーラム講演論文集   18th   2019

  • 複数ノード故障に対するIP高速迂回法の検討

    沼田直人, 樽谷優弥, 福島行信, 横平徳美

    情報科学技術フォーラム講演論文集   18th   2019

  • クライアントからの再送要求に基づくTCPインキャスト回避法

    岸本紫電, 長田繁幸, 長田繁幸, 樽谷優弥, 福島行信, 横平徳美

    情報科学技術フォーラム講演論文集   18th   2019

  • 深層学習を用いたネットワークトラフィック予測

    徳山雄丈, 福島行信, 樽谷優弥, 横平徳美

    情報科学技術フォーラム講演論文集   18th   2019

  • サーバ移動サービスシステムのプロトタイプ開発

    高橋謙太, 福島行信, 村瀬勉, 樽谷優弥, 横平徳美

    情報科学技術フォーラム講演論文集   18th   2019

  • サーバ移動サービスにおける最小支配集合を用いたワークプレース容量設計法の性能改善

    伊藤嵩真, 福島行信, 村瀬勉, 横平徳美

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

  • Energy-Aware On-line Server Location Decision Algorithm in Server Migration Service

    116 ( 484 )   71 - 76   2017.3

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  • Performance Improvement of an On-line Server Location Decision Algorithm in Server Migration Service

    115 ( 483 )   493 - 498   2016.3

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  • B-6-63 Performance Improvement of an On-line Server Location Decision Algorithm in Server Migration Service

    Sugiyama Hiromichi, Fukushima Yukinobu, Motoyoshi Gen, Murase Tutomu, Yokohira Tokumi

    Proceedings of the IEICE General Conference   2016 ( 2 )   63 - 63   2016.3

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  • Strict Application Execution Control with Hierarchical Group Management Using Digital Certificates on Educational Windows PCs

    Daisuke Okamoto, Keita Kawano, Nariyoshi Yamai, Tokumi Yokohira

    56 ( 6 )   2015.6

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  • Design of Flexible and Strict Application Execution Control using Digital Certification on Educational Windows PCs

    Daisuke Okamoto, Keita Kawano, Nariyoshi Yamai, Tokumi Yokohira

    IPSJ SIG Technical Reports   2014 ( 3 )   1 - 8   2014.6

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    We have developed an Application Execution Control System (traditional system) which provides individual application environments on each educational PC by controlling its execution. The traditional system uses a hash value of the execution file to control target application. If the execution file is falsified, a rule already set gets invalid. In addition, the traditional system has a function to set rules for multiple application at once. However, it cannot handle multiple groups at once. In order to solve these problems, this paper proposes a control method using digital certificates. It supports strict control and flexible group management by using hierarchical structure of digital certificates.

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  • Light-trail Multi-splitting Method in Light-trail Networks

    FUKUSHIMA Yukinobu, KIKUMOTO Taishi, CHEN Wenjie, YOKOHIRA Tokumi

    IEICE technical report   111 ( 468 )   463 - 468   2012.3

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    As a new optical network architecture that can be built with currently available devices and can achieve bandwidth allocation with granularity finer than a wavelength, the light-trail architecture attracts attention. For the light-trail architecture using token passing medium access control, the split trail architecture is proposed for improving the throughput. In the architecture, a trail is split into the upstream trail and the downstream trail at the token holding node and independent data transmissions on the two trails are permitted. However, the split trail architecture leaves the bandwidth of links upstream of the upstream-token holding node idle because the split of the trail is driven by the reception of only the downstream-token. In this paper, we propose the multi-split trail architecture for further improving the throughput. Our architecture utilizes the idle bandwidth by splitting the trail driven by the reception of both upstream- and downstream-tokens. We formulate the decision problem of the traffic accommodation where we optimize the token holding times so that the input traffic is successfully accommodated, as a linear programming problem. Then, we derive the maximum effective throughput of the multi-split trail architecture by solving the problem, and investigate the degree of improvement over the split trail architecture. According to numerical examples, the multi-split trail architecture achieves 1) the same maximum effective throughput as the split trail architecture for an uniform traffic pattern where every node pair has the same sending rate, and 2) about 1.93 times as high maximum effective throughput for its favorite traffic pattern where every transmission node sends data to its adjacent downstream node only and their rates are identical.

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  • Destination Selection Algorithms in Server Migration Service

    NAKAGAWA Mari, YAMANAKA Asato, FUKUSHIMA Yukinobu, MURASE Tutomu, YOKOHIRA Tokumi, SUDA Tatsuya

    IEICE technical report   111 ( 232 )   93 - 98   2011.10

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    Server migration service provides network applications (NW Apps) with server running environment on a computer (WP) and service of server migration to another WP where the NW App can attain better QoS when it is degraded. Because the file size of a server is large, the traffic for server migration causes QoS degradation of its background traffic. Thus, it is important to decrease the degree (impact) of the QoS degradation. In this paper, we propose three destination selection algorithms MIA, MRA and MCA that try to decrease the impact while increasing the number of NW App's clients whose SLA are satisfied. When a server migration is triggered, MIA, MRA and MCA move the server to the WP with the minimum impact, the WP with the maximum remaining space for servers and the WP with the maximum communication range where the SLA is satisfied, respectively. Numerical examples show that when there is no full-cover WP (on which a server can communicate with an arbitrary client while satisfying the SLA) or its space is small, MIA outperforms the others, otherwise MCA outperforms the others.

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  • BS-5-13 Server Migration Algorithms Taking Account of Qos in IaaS Cloud Service

    Kanzaki K., Nakagawa M., Fukushima Y., Murase T., Yokohira T., Suda T.

    Proceedings of the IEICE General Conference   2011 ( 2 )   "S - 119"-"S-120"   2011.2

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  • Server Push-out Algorithms in Server Migration Service

    KANZAKI Koji, FUKUSHIMA Yukinobu, MURASE Tutomu, YOKOHIRA Tokumi, SUDA Tatsuya

    IEICE technical report   110 ( 449 )   163 - 168   2011.2

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    Server migration service is considered as one of IaaS-typed cloud services. The target of the service is such a application that consists of servers and their clients, and, each server works on a computer called a working place (WP) and can voluntarily migrate to another WP if necessary. However, if the destination WP is full of servers, a server in the WP may be forced to be pushed out of the current WP and migrate to another WP to accept the voluntary immigration server. In this paper, in order to protect some particular servers from experiencing voluntary migration or forced migration much more than the other servers, in the viewpoint of migration fairness, three methods to determine the candidates to be pushed out based on the numbers of voluntary migrations and forced migrations. Next, we propose two methods to determine such one pushed-out server from the candidates that the impact caused by forced migration against the network becomes as small as possible.

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  • Optimization of Token Holding Times in Split Light-trail Networks

    CHEN Wenjie, FUKUSHIMA Yukinobu, YOKOHIRA Tokumi

    IEICE technical report   110 ( 339 )   197 - 202   2010.12

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    As a new optical network architecture that can be built with currently available devices and can achieve bandwidth allocation with granularity finer than a wavelength, the light trail architecture attracts attention. For the light trail architecture using token passing medium access control, the split trail architecture is proposed. In the architecture, a trail is split into the upstream trail and the downstream trail at the token holding node and independent data transmissions on the two trails are permitted. As a result, we expect that the architecture achieves higher maximum throughput than the original unsplit trail architecture. The degree of throughput improvement by the split trail one depends on how appropriately we set upstream and downstream token holding times of each transmission node. In this paper, we formulate decision problem of the token holding times as a non-linear programming problem, derive the maximum throughput of the split trail architecture by solving the problem using NUOPT solver, and investigate the degree of improvement compared to the original one. According to numerical examples, the split trail architecture achieves 1) the same maximum throughput as the original one for its unfavorite traffic pattern where every transmission node sends data to the terminating node of the trail only, 2) about 1.6 times as high maximum throughput for an uniform traffic pattern where every node pair has the same sending rate, and 3) about 1.9 time as high maximum throughput for its favorite traffic pattern where every transmission node sends data to its adjacent downstream node only.

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  • B-6-40 Performance Evaluation of TCP over Multipath Routing

    Matsumura Takashi, Fukushima Yukinobu, Nishida Yuichi, Yokohira Tokumi

    Proceedings of the Society Conference of IEICE   2010 ( 2 )   40 - 40   2010.8

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  • B-6-92 Early Detection of Increasing Traffic with Distributed Traffic Monitoring

    Niboshi M., Fukushima Y., Murase T., Fujimaki R., Hirose S., Yokohira T.

    Proceedings of the IEICE General Conference   2010 ( 2 )   92 - 92   2010.3

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  • Throughput Improvement based on Dynamic Trail Partitioning in Light-Trail Networks

    TANAKA Kota, CHEN Wenjie, FUKUSHIMA Yukinobu, YOKOHIRA Tokumi

    IEICE technical report   109 ( 448 )   479 - 484   2010.2

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    As a new optical network architecture that can be built with currently available devices, light trail networks attract attention. A trail is an unidirectional communication channel which is set up by reserving a specific wavelength along a route between a source node and a destination node, and packet communication from an arbitrary node to its downstream nodes is possible. Because a trail is a shared medium, we need medium access control (MAC) to avoid collisions of packets. Token passing type MAC methods such as light-trail fair access MAC (LT-FA MAC) and adaptive round time MAC (ART MAC) have been proposed. In those methods, however, downstream bandwidth of the token holding node is only used, and upstream bandwidth becomes idle. In this paper, we try to improve throughput of a trail by using those idle bandwidth effectively in a token passing type MAC method. In order to achieve this, we propose a dynamic trail partitioning method that dynamically partitions a trail into upstream trail and downstream one at the token holding node, and permits parallel transfer of data using two trails. Numerical calculations and simulations show that the dynamic trail partitioning method can improve throughput by a maximum of more than 80%.

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  • Early Detection of Increasing Traffic with Distributed Traffic Measuring

    NIBOSHI Mamoru, FUKUSHIMA Yukinobu, MURASE Tutomu, FUJIMAKI Ryohei, HIROSE Shunsuke, YOKOHIRA Tokumi

    IEICE technical report   109 ( 449 )   331 - 336   2010.2

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    With the spread of broadband access lines, many services making efficient use of them such as video streaming services have appeared. The popularity of these services can cause problems such as the shortage of the Internet backbone capacity, so it is important to detect increasing traffic which cause these problems early. In this paper, we propose an early detection method (partial aggregation method) of increasing traffic under per-subnet based distributed traffic monitoring. The method estimates future overall traffic volume by taking account of estimated traffic volume in all subnets and the estimated number of subnets generating increasing traffic. We compare the proposed method to a previous method (aggregation method) which takes account of estimated traffic volume in all subnets only. The results show that the partial aggregation method can detect increasing traffic earlier than the aggregation method by a maximum of 90 days.

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  • B-6-13 Accuracy Improvement of Multi-Stage Change-Point Detection Scheme Based on Alert Weighting

    Wang En, Fukushima Yukinobu, Murase Tutomu, Fujimaki Ryohei, Hirose Syunsuke, Yokohira Tokumi

    Proceedings of the IEICE General Conference   2009 ( 2 )   13 - 13   2009.3

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  • B-7-32 Performance Evaluation of Light-Trail Networks with Cut-Through Function

    Chen Wenjie, Fukushima Yukinobu, Yokohira Tokumi

    Proceedings of the IEICE General Conference   2009 ( 2 )   176 - 176   2009.3

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  • B-7-30 Performance Evaluation of Medium Access Control Methods in Light Trail Networks

    Tanaka Kota, Fukushima Yukinobu, Yokohira Tokumi

    Proceedings of the IEICE General Conference   2009 ( 2 )   174 - 174   2009.3

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  • Performance Evaluation of Peer Selection Algorithms for P2P Live Streaming

    FUJIWARA Yasuyuki, FUKUSHIMA Yukinobu, YIN Tao, INADA Kazuya, YOKOHIRA Tokumi

    IEICE technical report   108 ( 458 )   423 - 428   2009.2

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    In this paper, we propose two peer selection algorithms to increase the number of joining peers and decrease the traffic amount between ASs in P2P live streaming, where we assume that the number (logical hop count) of relaying peers is limited by a predetermined value in order to keep real-time property of live streaming. In the first method, a newly joining peer selects such providing peers that the logical hop count is minimum to increase the number of joining peers. And then if there are several such providing peers, the newly joining peer selects such providing peers that the number (physical hop count) of ASs between the newly joining peer and each of the providing peers is minimum to decrease the traffic amount between ASs. In the second peer selection method, a newly joining peer selects providing peers in the reverse order of the first selection method. Simulation results show that the former increases the number of joining peers compared to the latter. Moreover, when the number of joining peers is small (large), the traffic amount between ASs in the latter (the former) is smaller.

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  • B-7-73 Performance Comparison of Burst Assembly Methods Assembling Packets Arriving during an Offset Period into a Burst in Optical Burst Switching Networks

    Noine Yasuhiro, Fukushima Yukinobu, Yokohira Tokumi

    Proceedings of the IEICE General Conference   2008 ( 2 )   150 - 150   2008.3

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  • BS-5-2 Detection of Worm Epidemics Based on a Change in the Number of Destination IP Addresses in Multi-Stage Change-Point Detection Scheme

    Niboshi Mamoru, Murase Tutomu, Kobayashi Masayoshi, Fujimaki Ryohei, Fukushima Yukinobu, Yokohira Tokumi

    Proceedings of the IEICE General Conference   2008 ( 2 )   "S - 60"-"S-61"   2008.3

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  • Preservation of TCP Communications Considering Macro Mobility of User Terminals

    KIZAWA Masao, NIKUSHI Nobuhiro, OKAYAMA Kiyohiko, YAMAI Nariyoshi, YOKOHIRA Tokumi

    IEICE technical report   106 ( 578 )   43 - 48   2007.3

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    In recent years, inexpensive and lightweight portable terminals such as laptop PCs are spreading, and outdoor Internet services such as wireless hot spots are increasing. Therefore, users can connect to the Internet at various locations by their own terminal. However, if a terminal establishing TCP connections starts to move to another network, there is a problem that TCP connections are aborted due to retransmission timeout and the change of terminal's IP address. In this paper, we propose a method to preserve TCP connections for macro mobility of terminals by hiding the change of IP address from TCP layer using VPN and by preventing retransmission using proxies.

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  • Performance Evaluation of a Multi-Stage Network Anomaly Detection Scheme for Decreasing the False-Positive Rate against a Large Number of Simultaneous, Unknown Events

    MURASE Tutomu, FUKUSHIMA Yukinobu, KOBAYASHI Masayoshi, FUJIWARA Hiroki, YOKOHIRA Tokumi

    IEICE technical report   106 ( 358 )   25 - 30   2006.11

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    Change-point detection schemes are a promising approach for detecting network anomalies such as attacks and infections by unknown viruses and worms. They detect those behaviors as change-points. In general, however, because they also detect false-positive change-points, those caused by other factors such as hardware troubles, we need a scheme that only detects true-positive change-points caused by attacks and infections. True-positive change-points tend to occur simultaneously, and the number of true-positive change-points is very large, while false-positive change-points tend to occur sporadically. We exclude false-positive change-points by neglecting change-points that occur sporadically, based on information gathered from the whole network. In this paper, we propose a multi-stage network anomaly detection scheme that aggregates change-point information from distributed IDSs (Intrusion Detection Systems) and detects the true-positive change-points. Simulation results illustrate that, compared to a scheme using only one IDS, our method always yields a smaller false-positive rate, a reduction of up to 98%, under a constraint that the detection rate of the true-positive change-points must exceed 0.99.

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  • Performance Improvement by using Multiple Burst Header Packets in Optical Burst Switching Networks

    NAGAHARA Kazuteru, YOKOHIRA Tokumi

    IEICE technical report   105 ( 627 )   101 - 104   2006.3

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    In optical burst switching networks, a larger value of the offset time (the time duration between the burst assembly finishing time and the transmission time of the burst) is desirable to decrease packet loss rate. However, a larger offset value introduces a longer delay at edge routers because packet arriving during the offset time are not assembled into the current burst in conventional methods. In this paper, we consider a strategy where a larger offset time is used and packets arriving during the offset time are assembled into the current burst. In order to attain the policy, we propose two methods A and B. In the method A, we estimate the amount of packets arriving duration the offset time and we reserve wavelength channels so that the packets can be transmitted by the current burst. The method A however has a weak point that the reserved time is partly useless when the estimated amount is too large. In order to resolve it, the method B again estimates the amount of arrived packets halfway through the offset time and releases the redundant reserved time when the second estimated amount is less that the first one. Numerical examples shows the effectiveness of the proposed methods, and the method B is superior to the method A when the packet arrival process is the Pareto ON-OFF process.

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  • A High-speed Method for Calculating Worst-case Link Delays in EDD Connection Admission Control Scheme : In the case that many connections with large allowable end-to-end delay are established

    MIYAKE Ryusuke, YOKOHIRA Tokumi

    IEICE technical report   105 ( 470 )   33 - 36   2005.12

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    In order to calculate the worst-case link delays in the EDD (Earliest Due Date) connection admission control scheme, a check called the point schedulability check is necessary for each of finite and discrete time instants (checkpoints). In our previous calculation method, high speed calculation is attained by decreasing an upper bound value of checkpoints. However, the method can not calculate at high speed when many connections with large allowable end-to-end delays are established. The purpose of the paper is to improve the previous method. In this paper, we clarify that we do not have to execute the point schedulability check for an interval of checkpoints which are less than the upper bound value in the previous method, and based on the fact, high speed calculation can be attained. Numerical examples show that the proposed method drastically decreases the calculation time when many connections with large allowable end-to-end delays are established.

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  • Improvement of a Method for Calculating Worst-case Link Delays in EDD Connection Admission Control Scheme

    MIYAKE Ryuusuke, YOKOHIRA Tokumi

    IEICE technical report   105 ( 86 )   53 - 56   2005.5

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    In order to calculate the worst-case link delays in the EDD (Earliest Due Date) connection admission control scheme, a check called the point schedulability check is necessary for each of finite and discrete time in stants (checkpoints). In our previous calculation method, high speed calculation is attained by decreasing a upper bound value of checkpoints. However, the method can not calculate at high speed when networks are temporarily in congested state. The purpose of the paper is to improve the previous method. The upper bound value of the previous method depends on the slope and the intercept of a linear function called a covering function, and its value drastically increases for the small increase of the slope and slowly increases for the small increase of the intercept. Because the previous method uses a covering function whose slope is large in the temporal congested state, the calculation time becomes large. The improved method uses a covering function whose slope is minimum and whose intercept somewhat larger than the previous method, and consequently the upper bound value of checkpoints become smaller. The improved method therefore can attain high speed calculation in the temporal congested state. Numerical examples show that the improved method drastically decrease the calculation time in the temporal congested state.

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  • Node Placement Algorithms for Shuffle-Like WDM Networks : In case that routes are assumed to be design variables

    IZUMI Yoshiki, YOKOHIRA Tokumi, OKAMOTO Takuji

    IEICE technical report   104 ( 60 )   5 - 8   2004.5

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    Two heuristic node placement algorithms, DIST and SPARSE, have been proposed for Shuffle-Like Networks (SL-Nets). Since a route between two nodes is assumed to be given, the algorithms have the problem that traffic amounts over some links may be too large. In this report, we propose two new node placement algorithms, New_DIST and New_SPARSE, in which routes are assumed to be design variables. New_DIST (New_SPARSE) places nodes in the same way as DIST (SPARSE), and selects such a shortest path between two nodes that traffic amounts of links are balanced. Numerical examples for four typical traffic matrices show that the better performance can be obtained by using one of the proposed algorithms for each matrix.

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  • CMOS Floating Gate Defect Detection Using Supply Current Test with DC Power Supply Superposed by AC Component

    MICHINISHI Hiroyuki, YOKOHIRA Tokumi, OKAMOTO Takuji, KOBAYASHI Toshifumi, HONDO Tsutomu

    IEICE Trans. Inf. & Syst., D, March 2004   87 ( 3 )   551 - 556   2004.3

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    This paper proposes a new supply current test method for detecting floating gate defects in CMOS ICs. In the method, unusual increase of the supply current caused by defects is promoted by superposing an AC component on the DC power supply. Feasibility of the test is examined by some experiments on four DUTs with an intentionally caused defect. The results showed that our method could detect clearly all the defects, one of which may be detected by neither any functional logic test nor any conventional supply current test.

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  • A Delay Margin Assignment Method for EDD Connection Admission Control Scheme : A Method Performing the Assignment When It Is Necessary

    YOKOHIRA Tokumi, YAMASHITA Akira, OKAMOTO Takuji

    IEICE technical report   103 ( 386 )   21 - 24   2003.10

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    In the EDD connection admission control scheme, a connection is established if its allowable end-to-end delay is larger than or equal to the worst-case end-to-end delay, and the timing of assignment of the difference (called a delay margin) between the two delays is an important issue. In conventional assignment methods, the assignment is performed when the connection establishment request is accepted. In this paper, we propose a new assignment method in which the assignment is not performed when the connection establishment request is accepted, and is performed when it is necessary to establish a connection in the future. Simulation results show that the maximum number of established connections by the proposed method is roughly equal to or up to 1.30 times as large as those by conventional ones.

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  • An Assignment Method of end-to-end delay margin in EDD Connection Admission Control Scheme

    Yokohira Tokumi, Ikeda Kazuya, Okamoto Takuji

    Proceedings of the IEICE General Conference   2000 ( 2 )   54 - 54   2000.3

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  • Testing of Look-up table FPGAs

    Michinishi Hiroyuki, Yokohira Tokumi, Okamoto Takuji, Inoue Tomoo, Fujiwara Hideo

    Technical report of IEICE. FTS   95 ( 87 )   49 - 56   1995.6

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    This paper presents a universal testing method which can check whether unprogrammed look-up table FPGAs(Field Programmable Gate Arrays) are fault free or not. Such an FPGA is constructed with four kinds of blocks, configurable logic block, cross-point switch block, switch matrix and IO block. First, configurations and test patterns for testing each block are derived. Second, they are extended so that several blocks of the same kind can be simultaneously tested. The FPGA can be tested with O(N) configurations, where N is the row size (column size) of the FPGA.

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  • A Multiwindow Generation Method for High Speed Window Operations

    Tsunashima N., Sato Y., Yokohira T., Okamoto T.

    Proceedings of the IEICE General Conference   1995 ( 1 )   172 - 172   1995.3

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  • On the Relation between Network Topology and Packet Transmission Delay in Shuffle-Like Switching Network

    Inoue Naoko, Yokohira Tokumi, Okamoto Takuji

    Technical report of IEICE. SSE   93 ( 389 )   49 - 54   1993.12

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    This paper describes the influence of network topologies on end- to-end packet transmission delays in Shaffie-Like Switching Networks.The network consists of n×2^k nodes.The influence is anal yzed by means of simulation in which n and k are varied in various combinations.And it is carified that,if the number of nodes is held constant,the best topology is obtained at the maximum value of n under the condition that the average minimum end-to-end path length is held near the minimum value.

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  • Performance Comparison of Distributed Type Switching Networks under a Single Link Failure

    Yokohira Tokumi, Takihiro Masatoshi, Inoue Naoko, Okamoto Takuji

    Technical report of IEICE. FTS   93 ( 182 )   1 - 8   1993.8

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    This paper evaluates performances of two distributed type switching networks,the Manhattan Street Network(MS-Net)and ShuffleNet(SH-Net),by simulation.The performance measure is average end-to-end transmission delay.Packets enter the networks in the order of generation(FIFO mode)or an order determined by their destinations(SCAN mode),and traverse the networks along the routes decided by deflection routing.SCAN mode is superior to FIFO one in either network if it is,fault-free.In both of fault-free case and a single link failure case,SH-Net is superior to MS-Net if SCAN mode is adopted.

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  • MINIMUM TEST SET FOR LOCALLY EXHAUSTIVE TESTING OF MULTIPLE-OUTPUT COMBINATIONAL-CIRCUITS

    H MICHINISHI, T YOKOHIRA, T OKAMOTO

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS   E76D ( 7 )   791 - 799   1993.7

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  • Testing Processor Control Circuit with Instruction Execution -Minimum Test Set for Sequencer Considering Timing Controller Test-

    1990 ( 81 )   1 - 8   1990.10

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Presentations

  • 仮想網マッピングシステムの機能拡張-仮想リンク単位での経路選択の実現-

    電気・情報関連学会中国支部第69回連合大会  2018 

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  • マルチパスTCPにおける輻輳制御方式のスループット公平性の検討

    電気・情報関連学会中国支部第69回連合大会  2018 

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  • IP高速迂回法における想定外故障の迂回可能性の検討

    電気・情報関連学会中国支部第69回連合大会  2018 

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  • Link Capacity Provisioning and Server Location Decision in Server Migration Service

    IEEE International Conference on Cloud Networking (CloudNet 2018)  2018 

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  • The Effect of Using Attribute Information in Network Traffic Prediction with Deep Learning

    International Conference on ICT Convergence 2018 (ICTC 2018)  2018 

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  • Backoff Algorithms to Avoid TCP Incast in Data Center Networks

    International Conference on ICT Convergence 2018 (ICTC 2018)  2018 

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  • マルチパスTCPのスループット公平性の 検討

    電子情報通信学会2018年総合大会  2018 

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  • Workplace Capacity Design Using the Minimum Dominating Set in Server Migration Services

    The 9th IFIP International Conference on New Technologies, Mobility and Security (NTMS 2018)  2018 

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  • データセンターネットワークにおけるTCPインキャスト回避法の性能改善

    電子情報通信学会2017年総合大会  2017 

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  • Improvement of a TCP Incast Avoidance Method using a Fine-grained Kernel Timer

    International Conference on ICT Convergence 2017 (ICTC 2017)  2017 

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  • 多重ルーティング形態法における予備テーブルのエントリ数の低減

    電子情報通信学会2017年総合大会  2017 

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  • Load Modulation Based MIMO Communication for the Low Complexity and Low Power Consumption

    2016 IEEE International Conference on Consumer Electronics (ICCE 2016)  2016 

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  • Power-Aware Server Lofcation Decision in Server Migration Service

    International Conference on ICT Convergence 2016 (ICTC 2016)  2016 

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  • Prototype Development of a Virtual Network Embedding System Using OpenStack

    The 31st International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2016)  2016 

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  • Nonlinearity Sensitivity of FBMC and UFMC Modulation System for the 5G Mobile System

    The 31st International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2016)  2016 

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  • Performance Evaluation of an Energy Efficient Virtual Network Mapping Method -In the case of load-dependent power consumption model-

    The International Conference on Electronics and Software Science 2015 (ICESS 2015)  2015 

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  • An On-line Algorithm to Determine the Location of the Server in a Server Migration Service

    The 12th Annual IEEE Consumer Communications & Networking Conference (CCNC 2015)  2015 

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  • 多重ルーティング形態法における予備テーブルのエントリ数の低減

    第17回IEEE広島支部学生シンポジウム (HISS 2015)  2015 

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  • 消費電力低減を指向した仮想網マッピング手法の性能評価 --機器の消費電力が負荷に応じて変化する場合--

    第17回IEEE広島支部学生シンポジウム (HISS 2015)  2015 

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  • マルチパスTCPにおけるスループット公平性の改善

    第17回IEEE広島支部学生シンポジウム (HISS 2015)  2015 

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  • サーバ移動トラヒックの背景トラヒック への影響に関する実験的評価

    電気・情報関連学会中国支部第66回連合大会  2015 

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  • 複数アプリケーション存在下におけるマルチパスTCPのスループット評価

    電気・情報関連学会中国支部第66回連合大会  2015 

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  • Power Consumption Evaluation of Light-trail Networks

    ITC-CSCC  2014 

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  • 教育用WindowsPCにおけるデジタル証明書を用いた柔軟かつ堅牢なアプリケーション実行制御システムの設計

    情報処理学会インターネットと運用技術研究会研究報告vol.2014-IOT-26  2014 

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  • Throughput Improvement of TCP Proxies in Network Environment with Wireless LANs

    TENSYMP  2014 

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  • サーバ移動サービスにおけるサーバ配置決定アルゴリズム

    電子情報通信学会技術研究報告(NS2014-138)  2014 

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  • ロバストルーティング方式におけるバースト分配方式

    電子情報通信学会技術研究報告(NS2013-240)  2014 

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  • 光トレイルネットワークにおける省電力を指向したトラヒックエンジニアリング手法

    電子情報通信学会技術研究報告(NS2013-235)  2014 

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  • 多重ルーティングテーブル法における迂回経路導出法の改良

    電子情報通信学会2014年総合大会  2014 

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  • Power Efficiency Evaluation of Medium Access Control Methods in Light Trail Networks

    ITC-CSCC  2014 

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  • Performance Evaluation of Overlay Construction Algorithms in Mesh-pull P2P Live Streaming

    ITC-CSCC  2014 

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  • リソースとコストを考慮した仮想網マッピング

    第16回IEEE広島支部学生シンポジウム (HISS 2014)  2014 

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  • IPネットワークにおける故障からの高速回復のためのルート迂回法

    第16回IEEE広島支部学生シンポジウム (HISS 2014)  2014 

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  • 細粒度タイマを用いたTCP におけるバックオフ値の最適化

    第16回IEEE広島支部学生シンポジウム (HISS 2014)  2014 

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  • 光トレイルネットワークにおけるメディアアクセス制御方式の電力性能評価

    第16回IEEE広島支部学生シンポジウム (HISS 2014)  2014 

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  • メッシュプル型P2Pライブストリーミングにおけるオーバーレイネットワーク構築方式の性能評価

    電気・情報関連学会中国支部第65回連合大会  2014 

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  • A Reroute Method to Recover Fast from Network Failure

    International Conference on ICT Convergence 2014 (ICTC 2014)  2014 

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  • Optimization of Maximum Timeout Value in TCP with a Fine-grained Timer for Data Center Networks

    International Conference on ICT Convergence 2014 (ICTC 2014)  2014 

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  • Performance Improvement of SCTP Communication Using Selective Bicasting on Lossy Multihoming Environment

    2014 IEEE 38th Annual International Computers, Software and Applications Conference (COMPSAC 2014)  2014 

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  • TCP Incast の回避手法の改良

    第15回IEEE広島支部学生シンポジウム (HISS 2013)  2013 

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  • サーバ移動サービスにおける最適サーバ配置

    電子情報通信学会技術研究報告(NS2012-231)  2013 

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  • コネクション直列化によるTCP Incastの回避

    電子情報通信学会技術研究報告(NS2012-208)  2013 

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  • A Reroute Method Using Multiple Routing Configurations for Fast IP Network Recovery

    APCC  2013 

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  • Decreasing of the Number of Backup Tables in Multiple Routing Table Method for Fast IP Network Recovery

    ITC-CSCC  2013 

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  • A Per-burst Traffic Distribution Method for TCP Performance Improvement in Fixed Robust Routing

    ITC-CSCC  2013 

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  • A Multi-splitting Method for Light-trail Networks

    ITC-CSCC  2013 

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  • Optimization of Server Locations in Server Migration Service

    ICNS  2013 

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  • 多重ルーティングテーブル法における予備テーブル数の低減

    電子情報通信学会2013年総合大会  2013 

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  • サーバ移動サービスにおける移動先決定アルゴリズム 〜 複数サーバ移動の場合 〜

    電子情報通信学会技術研究報告(NS2012-232)  2013 

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  • Improvement of a TCP Incast Avoidance Method for Data Center Networks

    ICTC  2013 

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  • ロバストルーティング方式におけるバースト分配方式

    電気・情報関連学会中国支部第64回連合大会  2013 

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  • TCP Incast Avoidance Based on Connection Serialization in Data Center Networks

    APCC  2013 

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  • マルチパスTCPにおける受信バッファ最適化法のスループットへの影響

    第15回IEEE広島支部学生シンポジウム (HISS 2013)  2013 

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  • パケットロス環境下でのTCPの最適受信バッファサイズ

    第14回IEEE広島支部学生シンポジウム (HISS 2012)  2012 

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  • TCPの性能を考慮した複合型ロバストルーティング方式

    電子情報通信学会通信方式研究会  2012 

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  • P2PライブストリーミングにおけるASフレンドリーなピア選択法の性能改善

    電子情報通信学会2012年総合大会  2012 

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  • CAIDA Datasetに基づく国内ASトポロジーの精度検証と改善

    電子情報通信学会2012年総合大会  2012 

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  • TCPスループットを考慮した複合型ロバストルーティング方式

    電子情報通信学会2012年総合大会  2012 

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  • 光トレイルネットワークにおけるトレイル多重分割方式

    電子情報通信学会ネットワークシステム研究会  2012 

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  • Improvement of an ACK Returning Method of TCP Proxies in Network Environment with Wireless LANs

    GCCE  2012 

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  • A Solution to Transmission Halting In a New Flow Control Method TCP-fox

    APCC  2012 

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  • 多重ルーティングテーブルを用いたルート迂回法

    電気・情報関連学会中国支部第63回連合大会  2012 

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  • Destination Selection Algorithm in a Server Migration Service

    CFI  2012 

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  • Optimal TCP Receive Buffer Size under Packet Loss Environment

    ITC-CSCC  2012 

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  • Hybrid Fixed Robust Routing Taking Account of TCP Performance

    ITC-CSCC  2012 

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  • Inter-AS Traffic Volume Reduction by Localizing Delivery for P2P Live Streaming

    ICNC  2012 

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  • Performance Evaluation of TCP over Multiple Paths in Fixed Robust Routing

    IEEE CQR Workshop  2011 

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  • IaaS 型クラウドサービスにおけるQoSを考慮したサーバ移動アルゴリズム

    電子情報通信学会2011年総合大会  2011 

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  • サーバ移動サービスにおけるサーバ追い出しアルゴリズム

    電子情報通信学会情報ネットワーク研究会  2011 

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  • Optimization of Token Holding Times in Split Light Trail Networks

    IEEE GLOBECOM  2011 

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  • P2PライブストリーミングにおけるAS フレンドリーなピア選択法の性能改善

    第13回IEEE広島支部学生シンポジウム (HISS 2011)  2011 

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  • 無線LAN混在環境におけるTCPプロキシのACK返送法の改良

    電気・情報関連学会中国支部第62回連合大会  2011 

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  • サーバ移動サービスにおける移動先決定アルゴリズム

    電子情報通信学会ネットワーク研究会  2011 

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  • P2Pライブストリーミングにおけるピア選択法の性能評価 -部分的なASトポロジーのみが利用できる場合-

    電気・情報関連学会中国支部第61回連合大会  2010 

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  • 分散トラヒック計測に基づく増加トラヒックの早期検出

    電子情報通信学会2010年総合大会  2010 

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  • 分割型光トレイルネットワークにおけるトークン保持時間の最適化

    電子情報通信学会ネットワークシステム研究会  2010 

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  • 分散トラヒック計測に基づく増加トラヒックの早期検出

    電子情報通信学会情報ネットワーク研究会  2010 

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  • 重み付き階層型変化点検出方式の性能評価 -アラートに対する重み付けの有効性の検討-

    コンピュータセキュリティシンポジウム2010  2010 

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  • P2Pライブストリーミングにおけるピア選択法の性能評価 -日本国内におけるASトポロジを利用した評価-

    第12回IEEE広島支部学生シンポジウム (HISS 2010)  2010 

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  • マルチドメイン光パス網におけるスター型抽象化方式

    第12回IEEE広島支部学生シンポジウム (HISS 2010)  2010 

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  • マルチパスルーチングにおけるTCPの性能評価

    電子情報通信学会2010年ソサイエティ大会  2010 

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  • 光トレイルネットワークにおけるトレイルの動的分割によるスループットの向上

    電子情報通信学会ネットワークシステム研究会  2010 

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  • モバイルエージェントフレームワークにおけるデモンストレーション機能の実装

    電気・情報関連学会中国支部第61回連合大会  2010 

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  • 無線LAN混在環境におけるスプリット型TCPプロキシの性能評価

    電気・情報関連学会中国支部第61回連合大会  2010 

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  • 光トレイル網におけるメディアアクセス制御方式の性能評価

    電子情報通信学会2009年総合大会  2009 

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  • アラートの重み付けによる階層型変化点検出方式の精度改善

    電子情報通信学会2009年総合大会  2009 

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  • P2Pライブストリーミングにおけるピア選択方式の性能評価

    電子情報通信学会技術研究報告,IN2008-203  2009 

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  • ユーザ先行・追随型モバイルエージェントフレームワークによるモバイルディレクトリィの実装

    第11回IEEE広島支部学生シンポジウム (HISS 2009)  2009 

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  • P2PライブストリーミングにおけるAS間トラヒックの低減を目指したピア選択法

    電気・情報関連学会中国支部第60回連合大会  2009 

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  • カットスルー機能を備えた光トレイル網の性能評価

    電子情報通信学会2009年総合大会  2009 

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  • TCP性能向上プロキシにおける再送制御の実装,

    第10回IEEE広島支部学生シンポジウム (HISS2008),CD-ROM,C-01,pp.31-34  2008 

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  • モバイルエージェントフレームワークにSQLデータベースを用いた移動予測

    電気・情報関連学会中国支部第59回連合大会,pp.187-188  2008 

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  • 階層型変化点検出機構における宛先IPアドレス数の変化に基づくワーク拡散の検出

    電子情報通信学会2008年総合大会,pp.S60-S61  2008 

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  • 光バースト交換網におけるオフセット期間中の到着パケットもバースト化するバースト生成法の性能比較

    電子情報通信学会2008年総合大会  2008 

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  • 性能向上プロキシを用いたTCPにおける再送制御

    電子情報通信学会技術研究報告,NS2007-68,pp.77-82  2007 

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  • 同時多発する未知イベントに対する情報集約による偽陽性アラート排除検知方法の性能評価

    電子情報通信学会技術研究報告,ICSS2006-16, pp.37-42  2007 

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  • TCP性能改善のための早期ACK返送機能を有するルータの実装

    第9回IEEE広島支部学生シンポジウム (HISS 2007)  2007 

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  • モバイルエージェントフレームワークにおける地図情報を用いた移動予測

    第9回IEEE広島支部学生シンポジウム (HISS 2007)  2007 

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  • バースト交換網におけるバースト長推定に基づくバースト生成法の性能評価

    第9回IEEE広島支部学生シンポジウム (HISS 2007)  2007 

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  • 同時多発イベント検出を目的とした階層型変化点検出機構の性能評価

    電気・情報関連学会中国支部第58回連合大会,pp.379-380  2007 

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  • モバイルエージェントフレームワークにおける地図情報データベースの作成

    電気・情報関連学会中国支部第58回連合大会,pp.334-335  2007 

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  • OBSネットワークにおける複数のヘッダパケットの使用による性能改善

    電子情報通信学会技術研究報告,NS2005-183,pp.101-104  2006 

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  • 同時多発する未知イベントに対する情報集約による偽陽性アラート排除検知方法の性能評価

    電子情報通信学会技術研究報告,IN2006-89,pp.25-30  2006 

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  • ユーザ先行・追随型モバイルエージェントフレームワークにおけサーバの分散化

    第8回IEEE広島支部学生シンポジウム (HISS 2006),pp.139-142  2006 

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  • 性能向上プロキシを用いたTCPの性能評価 -パケットロスが生起する場合-

    第8回IEEE広島支部学生シンポジウム (HISS 2006), pp.97-100  2006 

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  • 性能改善プロキシを用いたTCPにおける公平性の検討

    電気・情報関連学会中国支部第57回連合大会,pp.532-533  2006 

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  • 光バースト交換網におけるエンド間遅延の低減を目指したバースト生成法

    電気・情報関連学会中国支部第57回連合大会,pp.530-531  2006 

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  • 性能向上プロクシを用いたTCPにおけるスループットの最適化

    電子情報通信学会技術研究報告,NS2006-96,pp.145-150  2006 

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  • インテリジェントマークとモバイルエージェントの融合によるユーザ支援手法の構築

    ヒューマンインターフェースシンポジウム2006 (HIS 2006), pp.1181-1184  2006 

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  • ユーザ先行・追随型モバイルエージェントフレームワークにおけるユーザエージエント消失からの回復法

    第7回IEEE広島支部学生シンポジウム,pp.337-340  2005 

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  • 早期ACKパケットの返送によるTCPの性能改善 -複数コネクションが存在する状況での性能評価-

    電子情報通信学会ネットワークシステム研究会,信学技報NS2005-129,pp.87-90  2005 

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  • ユーザ先行・追随型モバイルエージェントフレームワークにおけるサービス断絶状態からの回復法

    電気・情報関連学会中国支部第56回連合大会,pp.227-228  2005 

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  • 早期ACKパケットの返送によるTCPの性能改善

    電子情報通信学会ネットワークシステム研究会,信学技報NS2005-67,pp.25-28  2005 

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  • 長期的なリンクダウン状態に対するTCP通信の維持

    情報処理学会シンポジウムシリーズ(マルチメディア,分散,協調とモバイルシンポジウム (DICOMO 2005)),Vol.2005,No.6,pp.345-348  2005 

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  • EDDコネクション受付制御方式における最悪リンク遅延導出法の改良

    電子情報通信学会ネットワークシステム研究会,信学技報NS2005-37,pp.53-56  2005 

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  • PEPによるTCPの性能改善 --- 早期ACKパケットの返送タイミングがスループットに及ぼす影響 ---

    電子情報通信学会ネットワークシステム研究会,信学技報NS2004-264,pp.103-106  2005 

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  • 長期的なリンクダウン状態に対するTCP通信の維持

    第7回IEEE広島支部学生シンポジウム,pp.357-360  2005 

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  • EDDコネクション受付制御方式における最悪リンク遅延の高速導出法 -許容遅延の大きいコネクションが多数設定される場合-

    電子情報通信学会ネットワークシステム研究会,信学技報NS2005-141,pp.33-36  2005 

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  • EDDコネクション受付制御方式における最悪リンク遅延の高速導出法 --- 負荷が中程度以下の場合

    電子情報通信学会ネットワークシステム研究会  2004 

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  • ユーザ先行・追随型モバイルエージェントシステム構築のためのフレームワーク

    第6回IEEE広島支部学生シンポジウム  2004 

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  • バーストスイッチングにおける波長パス要求保留時間の性能への影響

    電気・情報関連学会中国支部第54回連合大会  2004 

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  • シャッフル型WDMネットワークにおけるノード配置アルゴリズム --- 経路を設計変数とした場合 ---

    電子情報通信学会ネットワークシステム研究会  2004 

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  • EDDコネクション受付制御方式における遅延余裕割当法 -必要が生じたときに割り当てる方法-

    電子情報通信学会ネットワークシステム研究会  2003 

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  • シャッフル型WDMネットワークにおけるノード配置アルゴリズム -経路を設計変数とした場合-

    電気・情報関連学会中国支部第54回連合大会  2003 

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  • EDDコネクション受付制御方式における最悪リンク遅延導出法の高速化

    電子情報通信学会ネットワークシステム研究会  2003 

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  • ネットワーク技術の最新動向(特別講演)

    計測自動制御学会中国支部計測制御シンポジウム2002予稿集  2002 

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  • EDDコネクション受付制御方式における最悪リンク遅延の高速導出法 -パケット長の最大値がコネクションによらず一定の場合-

    電子情報通信学会ネットワークシステム研究会  2002 

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  • ペンドラムテストによる痙縮の定量化手法

    第41回日本エム・イー学会大会論文集  2002 

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  • ペンドラムテストシミュレータによる痙縮の定量化手法

    第17回中国四国リハビリテーション医学研究会  2002 

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  • 相動性筋紡錘モデルの提案

    第25回日本ME学会中国四国支部大会  2002 

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  • シャッフル型波長分割多重方式パケット交換網におけるノード配置アルゴリズム

    電子情報通信学会ネットワークシステム研究会  2002 

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  • CMOSオープン故障の検出に関する研究

    電気・情報関連学会中国支部第53回連合大会  2002 

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  • モジュール化による機能独立を指向したテレビ会議システムの設計

    電気・情報関連学会中国支部第53回連合大会  2002 

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  • ジョセフソン素子による3変数論理関数の一構成法

    電気・情報関連学会中国支部第53回連合大会  2002 

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  • 筋粘弾性におる筋トーヌス低下の評価

    第16回中国四国リハビリテーション医学研究会  2001 

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  • ネットワークのリンクスケジューリングへのグラフ彩色アプローチ

    電子情報通信学会コンピュテーション研究会  2001 

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  • 膝関節反射評価装置の改良 -評価値算出時間の評価-

    第24回日本ME学会中国四国支部大会  2001 

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  • EDDコネクション受付制御方式における最悪リンク遅延の高速導出法 -コネクション設定要求の発生前における処理の高速化-

    電気・情報関連学会中国支部第52回連合大会  2001 

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  • EDDコネクション受付制御方式における最悪リンク遅延の高速導出法

    電子情報通信学会ネットワークシステム研究会  2001 

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  • ペンドラムテストによる痙縮の定量化 -測定系の改良-

    第40回日本エム・イー学会大会  2001 

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  • ペンドラムテストにおける反射の評価 -評価手続き簡略化のための測定系の改良-

    第23回日本ME学会中国四国支部大会  2000 

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  • シャッフル形ネットワークにおけるノード配置アルゴリズム -トラヒック分散を指向したアルゴリズム-

    電気・情報関連学会中国支部第51回連合大会  2000 

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  • 描画時合成方式と表示時合成方式とを併用した高速マルチウィンドウシステム -ウィンドウ親子関係の実現に関する検討-

    電気・情報関連学会中国支部第51回連合大会  2000 

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  • EDDコネクション設定制御方式における遅延余裕の一割当法 -最悪リンク遅延に比例した割当て-

    電子情報通信学会交換システム研究会  2000 

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  • EDDコネクション設定制御方式における遅延余裕の一割当法

    2000年電子情報通信学会総合大会(通信2)  2000 

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  • 膝関節反射評価装置の開発 -ペンドラムテストによる反射評価法の実用化に向けて-

    第15回中国四国リハビリテーション医学研究会  2000 

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  • ペンドラムテスト用チェアーの開発

    第14回中国四国リハビリテーション医学研究会  1999 

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  • ペンドラムテスト時の筋電発火と膝関節加速度波形 -α系亢進とγ系亢進による相違について-

    第22回日本ME学会中国四国支部大会  1999 

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  • 描画時合成方式と表示時合成方式とを併用した高速マルチウィンドウシステム -ウィンドウ操作時間の評価-

    電気・情報関連学会中国支部第50回連合大会  1999 

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  • EDDコネクション設定制御方式における最悪リンク遅延導出法の高速化

    電気・情報関連学会中国支部第50回連合大会  1999 

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Awards

  • 電子情報通信学会ネットワークシステム研究専門委員会活動功労賞

    2018  

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  • IEICE ESS貢献賞 (電子情報通信学会 基礎境界ソサイエティ 貢献賞)

    2016  

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    Country:Japan

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  • 2014 IEEE Region 10 Technical Symposium (TENSYMP 2014) best paper award

    2014  

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  • 第10回HISS記念論文賞受賞

    2008  

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    Country:Japan

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Research Projects

  • スマート農業支援のための苗木の成長予測システムの構築

    Grant number:24K09143  2024.04 - 2027.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    樽谷 優弥, 福島 行信, 横平 徳美

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    Grant amount:\4550000 ( Direct expense: \3500000 、 Indirect expense:\1050000 )

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  • Construction of a medical information secure management system using ICT and encryption technology

    Grant number:20K20484  2020.04 - 2023.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Research (Pioneering)

    野上 保之, 日下 卓也, 福島 行信, 横平 徳美, 山内 利宏

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    Grant amount:\25350000 ( Direct expense: \19500000 、 Indirect expense:\5850000 )

    昨年度として拡散暗号方式を完成させており、これをメールデータの暗号化・ユーザ認証として実装するためにThunderbirdに対して独自実装することができた(昨年度はEnigmailとして実装)。より具体的には、暗号強度を自在に変えることができる乗算アルゴリズムをC言語およびJavaScriptとして実装した。JavaScript実装については、必ずしも大きな整数での実装が効率よく働かないため、本研究の成果が有効に働く。具体的には、30ビット程度の整数演算をベースとしつつ、暗号の強度を上げるためにベクトルの次元数を上げることで3000ビットクラスの強度を実現する。その際に、安全性の観点からその群の位数が小さな素因数をもたないようにするために、十分安全な大きな素因数をもつようにパラメータを選択し、そのパラメータを用いることで実現する。一方で、その暗号の拡散性を実現するためのパラメータを自在に選べるようにできることを確認できた。そのようなことも踏まえ、2022年度としてはその拡散性をセッションキー・ワンタイムパスワード的に使えるようにするとともに、これを具体的な医療データの暗号化の方にも実装する。その際の秘密分散法についてもより軽量化した実装として実現することができており、さらなる安全性強度を実現できる。なお、ユーザ認証に関しては、ElGamal暗号および楕円曲線暗号をベースとした公開鍵認証を考えている。前者については2021年度として実装確認できており、2022年度としては後者での実現も図る。

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  • データセンターネットワークにおけるスループット急落の回避に関する研究

    Grant number:19K11926  2019.04 - 2023.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    横平 徳美, 福島 行信

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    Grant amount:\4290000 ( Direct expense: \3300000 、 Indirect expense:\990000 )

    分散ファイルシステムを採用しているデータセンターネットワークにおいては、多数のサーバが、ほぼ同時に、1台のクライアントに向けてデータを送信しようとすることがしばしば起こる。このとき、イーサネットスイッチのポートにおいてバッファーオーバーフローが起こり、スループットが0に近い値に急落する状況(インキャスト)が起こってしまうことがある。本研究の目的は、分散ファイルシステムにおいて、各サーバのデータ送信終了時間の公平性を気にする必要はなく、全サーバがデータ送信を終了するための時間が重要であることに着目して、サーバからのデータ送信を直列化することにより、インキャストを回避しつつスループットを最大にする方法を考案し、実際に実験ネットワークでその有効性を実証することである。
    2021年度は、データセンターネットワークにおける各リンクの伝送速度、イーサネットスイッチのポートバッファサイズ、サーバから送信されるデータ量(ユニットサイズ)等が与えられた時、インキャストを回避し、かつ、スループットを最大化できる同時設定(同時に並列化できる)コネクション数を求めることができる方法(拡張コネクション直列化法)の有効性に関して、2020年度に引き続いて検証した。
    また、高精度のカーネルタイマーを使用して、最小タイムアウト値を従来の200ミリ秒から数100マイクロ秒にすることにより、インキャストを回避しようとする従来の方法をベースとして、クライアントからサーバに再送要求を出すことで、インキャスト回避の可能性を高くできる方法を2019年度に提案し、2020年度はこの方法を改良したが、エラーを内在していたので、2021年度はさらなる改良を行った。
    さらに、上述した方法を統合して、実際のデータセンターネット上で動作できるようにするための基礎的検討を行った。

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  • 分散型交換ネットワークの性能評価に関する研究

    Grant number:05750353  1993

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    横平 徳美

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    Grant amount:\900000 ( Direct expense: \900000 )

    本研究の目的は,分散型交換ネットワークを対象として,ネットワーク内での伝送遅延時間のみならず,エンドユーザで新規に発生したパケットがネットワーク内に送出されるまでの待ち時間をも含めた性能評価を行うための同ネットワークのモデル化手法および解析手法を確立し,最適な分散型交換ネットワークを明らかにすることにある.ここでは,このための基礎研究として,Manhattan Street Network(MS-Net)と呼ばれる分散型交換ネットワークを対象に,以下の研究を行った.
    1.MS-Netにおけるノードのモデルとして,従来のノードモデルに送信バッファを追加した新たなモデルを考え,エンドユーザで新規に発生したパケットは,一旦送信バッファに収容され,次ノードへの中継リンクが使用可能になったとき,ネットワーク内に送出されるとすることにより,エンドユーザで発生したパケットがネットワーク内に送出されるまでの待ち時間の評価を可能にした.
    2.MS-Netは,mxn(m,nは正整数)個のノードで構成されるが,ノード数を固定しても,その形態は一意に決まらず,mとnの値に応じて様々な形態を取り得る.ここでは,mとnの様々な組合せに対して,1.のノードモデルを用いてシミュレーションを行い,ノード数を固定した場合,エンドユーザ間での平均パケット伝送遅延の面からのMS-Netの最適な形態は,mとnの差が最も小さいときの形態であるということを明らかにした.
    以上のように,本研究では,エンドユーザーで発生したパッケトがネットワーク内に送出されるまでの待ち時間を得るためのノードモデルを考え,これを用いたシミュレーション結果により,MS-Netの最適な形態を明らかにした.

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  • 高信頼性ネットワークの最適設計法に関する研究

    Grant number:03750291  1991

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    横平 徳美

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    Grant amount:\900000 ( Direct expense: \900000 )

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