Japanese/English

岡山大学　工学部　情報・電気・数理データサイエンス系
医用情報ネットワーク学研究室


よこ　ひらとく み
横　平　徳　美 (Tokumi Yokohira) 教授

700-8530 岡山市北区津島中3-1-1
TEL：　086-251-8182
FAX：　086-251-8255
E-Mail：　yokohira@okayama-u.ac.jp



研究略歴

1983年4月 計算機システムおよび通信システムの性能評価に関する研究に着手
1989年4月 VLSIの全数テスト，情報ネットワークの設計およびマルチウィンドウシステムの高速化に関する研究に着手
1990年4月 膝関節反射の定量化に関する研究に着手
1994年4月 FPGAのテストの関する研究に着手


研究テーマ

　　・高分散クラウド環境

クラウドコンピューティング環境では，データセンターで稼働するサーバとユーザ端末で稼働するクライアントとの間の距離が離れている場合や経路が混雑している場合にそれらの間の通信品質が劣化することがあります．本研究では，サーバの稼働場所となる計算機(WP: Work Place)がネットワーク内にあらかじめ多数分散配置されているという前提の下で，クライアント・サーバ間の通信品質の改善を図るサーバ配置決定アルゴリズムやWP容量設計方式について研究しています．

　　・仮想網構築技術

仮想化技術の発展により，物理的なネットワークを構成する資源(物理ノード上のCPU資源や物理リンク上の帯域幅資源)を共有可能な資源として仮想化し，その一部を利用して仮想的なネットワーク(仮想網)を構築・運用することが注目されています．本研究では，構築できる仮想網の数の最大化や消費電力の最小化を図る仮想網構築方式について研究しています．．

　　・インターネットの高速化技術

TCP (Transmission Control Protocol)はインターネットの黎明期から使用され続けているプロトコルですが，データセンターネットワークやマルチホーム環境などの当初は想定されていなかったネットワーク環境で使用された場合には通信速度を抑制する要因となり得ます．本研究では，データセンターネットワークにおいて通信速度が過度に抑制された状態(TCPインキャスト)が発生するのを回避するためのTCPの拡張や，LTEとWi-Fiの両方を利用できるスマートフォン等のマルチホーム環境において通信速度の向上を図るMultipath TCPについて研究しています．

　　・インターネットの対故障化技術

インターネットを構成する機器(ルータやリンク)が故障した場合には膨大な数の通信が中断されてしまいます．本研究では，インターネットで故障が発生しても引き続き通信を継続できるような迂回ルーティング方式について研究しています．

　　・光ネットワーク構築技術

インターネットの消費電力は急速な勢いで増加しており，その抑制が急務の課題となっています．この課題を解決するために，省電力性能が優れている光ネットワークのインターネットへの導入が進んでいます．本研究では，光ネットワークを対象として，省電力を指向したメディアアクセス制御方式やトラヒックエンジニアリング方式について研究しています．

　　・P2Pライブストリーミング

ンターネットを介して安価に動画像をライブ配信する方式としてP2Pライブストリーミング方式が提案されています．本研究では，インターネットサービスプロバイダ (ISP: Internet Service Provider)が負担しなければならない回線費用を低減するために，ISPネットワークの間で転送されるトラヒック量の低減を図るP2Pオーバレイネットワーク構築方式について研究しています．


研究業績(抜粋)

Selected Publications

Selected Publications


Journal Papers (with Review)
  1. Yukinobu Fukushima and Tokumi Yokohira, AS-friendly Peer Selection Algorithm for P2P Live Streaming, International Journal of Multimedia Technology, Vol. 4, Iss. 2, pp. 18-25, June 2014.

  2. Yukinobu Fukushima, Takahiro Ooishi and Tokumi Yokohira, A Wavelength and Converter Assignment Scheme using Converter Usage History in Wavelength-Routed Networks, International Journal of Computer Networks & Communications, Vol. 5, No. 4, pp. 63-73, July 2013.

  3. Hui Wang, Yuich Nishida, Yukinobu Fukushima, Tokumi Yokohira and Zhen Wu, Throughput Impovement for TCP with a Performance Enhancing Proxy Using a UDP-like Packet Sending Policy, IEICE Trans. Commun., Vol. E95-B, No. 7, pp. 2344-2357, 2012.

  4. Wenjie Chen, Yukinobu Fukushima and Tokumi Yokohira, An Architecture and a MAC Protocol for Throughput Improvement in Light Trail Networks．IEICE Trans. Commun., Vol. E95-B, No. 7, pp. 2330-2343, 2012.

  5. Yukinobu Fukushima, Tutomu Murase, Masayoshi Kobayashi, Hiroki Fujiwara, Ryohei Fujimaki and Tokumi Yokohira, Multi-stage change-point detection scheme for large-scale simultaneous events, Computer Communications, Vol. 34, pp. 1810-1821, 2011.

  6. Yukinobu Fukushima, Wengie Chen, Yasuyuki Fujiwara and Tokumi Yokohira, A Burst Assembly Method to Reduce End-to-End Packet Delay in Optical Burst Switching Networks, WSEAS Transactions on Communications, Vol. 8, Iss. 8, pp. 894-903, 2009.

  7. Hiroyuki Michinishi, Tokumi Yokohira, Takuji Okamoto, Toshifumi Kobayashi and Tsutomu Hondo, Detection of CMOS Open Node Defects by Frequency Analysis, IEICE Trans. Inf. & Syst., Vol. E90-D, No. 3, pp. 685-687, March 2007.

  8. Wang Hui, Shigeyuki Osada, Tokumi Yokohira, Kiyohiko Okayama and Nariyoshi Yamai, Effect of Premature ACK Transmission Timing on Throughput in TCP with a Performance Enhancing Proxy, IEICE Trans. Commun., Vol. E90-B, No. 1, pp. 31-41, Jan., 2007.

  9. Tokumi Yokohira and Kiyohiko Okayama, High-speed Calculation of Worst-case Link Delays in the EDD Connection Admission Control Scheme, IEICE Trans. Commun., Vol. E89-B, No. 7, pp. 2012-2022, July 2006.

  10. Nobuo Funabiki, Toru Nakanishi, Tokumi Yokohira, Shigeto Tajima and Teruo Higashino, A Proposal of a Quasi-Solution State Evaluation Algorithm for Channel Assignment Problems, Lecture Notes in Computer Sciences, Vol. 2344 (International Conference on Information Networks 2002, Revised Papers), pp. 32-41, Dec. 2002.

  11. Shigeto Tajima, Masakazu Fujii, Nobuo Funabiki, Tokumi Yokohira, Kazufumi Tsunemura and Teruo Higashino, An Optimal Path Selection Algorithm for Static and Mobile Multicast Routing Problems, Lecture Notes in Computer Sciences, Vol. 2343 (International Conference on Information Networks 2002, Revised Papers), pp. 193-202, Dec. 2002.

  12. Nobuo Funabiki，Tohru Nakanishi，Tokumi Yokohira, Shigeto Tajima and Teruo Higashino, A Quasi-Solution State Evolution Algorithm for Channel Assignment Problem in Cellular Networks, IEICE Transactions, Vol. E85-A, No. 5, pp. 977-987, May 2002.

  13. Hiroyuki Michinishi, Tokumi Yokohira, Takuji Okamoto, Tomoo Inoue and Hideo Fujiwara, Testing for the Programming Circuit of SRAM-Based FPGAs, IEICE Transactions, Vol. E82-D, No. 6, pp. 1051-1057, June 1999.

  14. Tokumi Yokohira, Toshimi Shimizu, Hiroyuki Michinishi, Yuuji Suigyama and Takuji Okamoto, The Number of Elements in Minimum Test Set for Locally Exhaustive Testing of Combinational Circuit with Five Outputs, IEICE Transactions, Vol. E78-D, No. 7, pp. 874-881, July 1995．

  15. Hiroyuki Michinishi, Tokumi Yokohira, Takuji Okamoto, Minimum Test Set for Locally Exhaustive Testing of Multiple Output Combinational Circuits, IEICE Transactions, Vol. E76-D, No. 7, pp. 791-799, July 1993.

  16. Tokumi Yokohira, Masashi Sugnano, Takeshi Nishida and Hideo Miyahara, Fault Tolerant Packet-Switched Network Design and Its Sensitivity, IEEE Transactions on Reliability, Vol. 40, No. 4, pp. 452-460, October 1991.

  17. Tokumi Yokohira, Hiroyuki Michinishi, Takuji Okamoto, Yuuji Sugiyama, Test Set for a Multibit Shifter Constructed with Multiplexers, IEICE Transactions, Vol. E73, No. 8, pp. 1301-1309, August 1990.

  18. Tokumi Yokohira, Takeshi Nishida and Hideo Miyahara, Analysis of Dynamic Behavior in p-persistent CSMA/CD using Cusp Catastrophe, COMPUTER NETWORKS and ISDN SYSTEMS, Vol. 12, No. 5, pp. 277-289, December 1986.



Conference Papers (with Review)
  1. Yuta Hoshino, Yukinobu Fukushima, Tutomu Murase, Tokumi Yokohira and Tatsuya Suda, 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), Junuary 2015. (to be presented)

  2. Yasuhiro Harada, Hui Wang, Yukinobu Fukushima and Tokumi Yokohira, A Reroute Method to Recover Fast from Network Failure, International Conference on ICT Convergence 2014 (ICTC 2014), pp. 903-908, October 2014.

  3. Ryo Miyayama, Shigeyuki Osada, Yukinobu Fukushima and Tokumi Yokohira, Optimization of Maximum Timeout Value in TCP with a Fine-grained Timer for Data Center Networks, International Conference on ICT Convergence 2014 (ICTC 2014), pp. 433-437, October 2014.

  4. Koki Okamoto, Nariyoshi Yamai, Kiyohiko Okayama, Keita Kawano, Motonori Nakamura, Tokumi Yokohira, Performance Improvement of SCTP Communication Using Selective Bicasting on Lossy Multihoming Environment, 2014 IEEE 38th Annual International Computers, Software and Applications Conference (COMPSAC 2014), pp. 551-557, July 2014.

  5. Ryo Fukuyama, Yukinobu Fukushima and Tokumi Yokohira, Power Efficiency Evaluation of Medium Access Control Methods in Light Trail Networks The 29th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2014), USB-MEMORY (4 pages), pp. 338-341, July 2014.

  6. Yasuaki Takatsuka, Yukinobu Fukushima and Tokumi Yokohira, Performance Evaluation of Overlay Construction Algorithms in Mesh-pull P2P Live Streaming, The 29th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2014), USB-MEMORY (4 pages), pp. 334-337, July 2014.

  7. Yukinobu Fukushima and Tokumi Yokohira, Power Consumption Evaluation of Light-trail Networks The 29th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2014), USB-MEMORY (4 pages), pp. 289-292, July 2014.

  8. Wang Hui, Yukinobu Fukushima and Tokumi Yokohira, Throughput Improvement of TCP Proxies in Network Environment with Wireless LANs, 2014 IEEE Region 10 Technical Symposium (TENSYMP 2014), pp. 86-91, April 2014. Selected as one of the best paper awards.

  9. Kazutoshi Kajita, Shigeyuki Osada, Yukinobu Fukushima and Tokumi Yokohira, Improvement of a TCP Incast Avoidance Method for Data Center Networks, International Conference on ICT Convergence 2013 (ICTC 2013), pp. 459-464, October 2013.

  10. Daiki Imahama, Yukinobu Fukushima and Tokumi Yokohira, A Reroute Method Using Multiple Routing Configurations for Fast IP Network Recovery, The 19th Asia-Pacific Conference on Communications (APCC 2013), pp. 439-444, August 2013.

  11. Shigeyuki Osada, Kazutoshi Kajita, Yukinobu Fukushima and Tokumi Yokohira, TCP Incast Avoidance Based on Connection Serialization in Data Center Networks, The 19th Asia-Pacific Conference on Communications (APCC 2013), pp. 120-125, August 2013.

  12. Daiki Imahama, Yukinobu Fukushima and Tokumi Yokohira, Decreasing of the Number of Backup Tables in Multiple Routing Table Method for Fast IP Network Recovery, The 28th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2013), CD-ROM (4 pages), pp. 823-826, July 2013.

  13. Yu Sezaki, Yukinobu Fukushima, Takahiro Nabeta and Tokumi Yokohira, A Per-burst Traffic Distribution Method for TCP Performance Improvement in Fixed Robust Routing, The 28th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2013), CD-ROM (4 pages), pp. 819-822, July 2013.

  14. Yukinobu Fukushima and Tokumi Yokohira, A Multi-splitting Method for Light-trail Networks, The 28th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2013), CD-ROM (4 pages), pp. 803-806, July 2013.

  15. Yukinobu Fukushima, Tutomu Murase, Tokumi Yokohira and Tatsuya Suda, Optimization of Server Locations in Server Migration Service, The Ninth International Conference on Networking and Services (ICNS 2013), pp. 200-206, March 2013.

  16. Kazuki Kobayashi, Yukinobu Fukushima and Tokumi Yokohira, Inter-AS Traffic Volume Reduction by Localizing Delivery for P2P Live Streaming, The Third International Conference on Networking and Computing (ICNC 2012), pp.156-161, December 2012.

  17. Takumi Shinkai, Wang Hui, Yuichi Nishida, Hiroyuki Ishihara, Yukinobu Fukushima and Tokumi Yokohira, A Solution to Transmission Halting In a New Flow Control Method TCP-fox, The 18th Asia-Pacific Conference on Communications (APCC 2012), pp. 806-811, October 2012.

  18. Naohiro Honda, Wang Hui, Yuichi Nishida, Yukinobu Fukushima and Tokumi Yokohira, Improvement of an ACK Returning Method of TCP Proxies in Network Environment with Wireless LANs, The 1st IEEE Global Conference on Consumer Electronics (GCCE 2012), pp. 715-719, October 2012.

  19. Asato Yamanaka, Yukinobu Fukushima, Tutomu Murase, Tokumi Yokohira and Tatsuya Suda, Destination Selection Algorithm in a Server Migration Service, The 7th International Conference on Future Internet Technologies (CFI 2012), pp. 15-20, September 2012.

  20. Takahiro Nabeta, Yukinobu Fukushima and Tokumi Yokohira, Hybrid Fixed Robust Routing Taking Account of TCP Performance, The 27th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2012), CD-ROM (4 pages), July 2012.

  21. Kazutoshi Kajita, Takumi Shinkai, Naohiro Honda, Yukinobu Fukushima and Tokumi Yokohira, Optimal TCP Receive Buffer Size under Packet Loss Environment, The 27th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2012), CD-ROM (4 pages), July 2012.

  22. Wenjie Chen, Yukinobu Fukushima and Tokumi Yokohira, Optimization of Token Holding Times in Split Light Trail Networks, IEE Globecom 2011, USB-MEMORY (5 pages), Dec. 2011.

  23. Wenjie Chen, Yukinobu Fukushima, Takashi Matsumura, Yuichi Nishida and Tokumi Yokohira, Performance Evaluation of TCP over Multiple Paths in Fixed Robust Routing, IEEE Communications Society Communications Quality and Reliability Workshop 2011 (CQR 2011), CD-ROM (6 pages), May 2011.

  24. Yukinobu fukushima, Mamoru Niboshi, Tutomu Murase, Ryohei Fujimaki, Shunsuke Hirose, Tokumi Yokohira, Early Detection of Increasing Traffic with Distributed Traffic Measurement, 2010 International technical conference of IEEE Region 10 (TENCON 2010), pp. 809-814, Nov. 2010.

  25. Mari Nakagawa, Yukinobu Fukushima, Tutomu Murase, Ryohei Fujimaki, Shunsuke Hirose, Tokumi Yokohira, Performance Evaluation of Multi-Stage Change-Point Detection Scheme with Alert Weighting, 2010 International technical conference of IEEE Region 10 (TENCON 2010), pp. 785-790, Nov. 2010.

  26. Yuichi Nishida, Hiroyuki Ishihara, Wang Hui, Yukinobu Fukushima and Tokumi Yokohira, TCP-fox: A New Flow Control Method for Improving TCP Throughput in Large Bandwidth-Delay Product Networks, International Symposium on Broadband Communication (ISBC) 2010, CD-ROM (3 pages), July 2010.

  27. Yuichi Nishida, Wang Hui, Yukinobu Fukushima and Tokumi Yokohira, Performance Evaluation of TCP Proxies in Network Environment Including Wireless LANs, The 25th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2010), pp. 1231-1234, July 2010.

  28. Yukinobu Fukushima, Yin Tao, Kazuya Inada and Tokumi Yokohira, AS-friendly Peer Selection Algorithms without AS Topology Information in P2P Live Streaming, The Eighth Asia-Pacific Symposium on Information and Telecommunication Technologies (APSITT 2010), USB-MEMORY (6 pages), May 2010.

  29. Yukinobu Fukushima, Kazuya Inada, Yin Tao, Yasuyuki Fujiwara and Tokumi Yokohira, Performance Evaluation of AS-friendly Peer Selection Algorithms for P2P Live Streaming, The 15th Asia-Pacific Conference on Communications (APCC 2009), October 2009.

  30. Yukinobu Fukushima, Kota Tanaka, Wenjie Chen and Tokumi Yokohira, Dynamic splitting of light trails for increasing throughput in light trail networks, The 24th International Technical Conference on Circuits/Systems, Computers and Communications (IT-CSCC 2009), pp. 1370-1373, July 2009.

  31. Yuichi Nishida, Wang Hui, Hiroaki Matsumoto, Hiroyuki Ishihara, Tokumi Yokohira, and Yukinobu Fukushima, Throughput Improvement of TCP using Split-Connection Type Proxies in Network Environment including Wireless LANs, The 24th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2009), pp. 1360-1363, July 2009.

  32. Yukinobu Fukushima, Tutomu Murase, Ryohei Fujimaki, Syunsuke Hirose and Tokumi Yokohira, Accuracy Improvement of Multi-Stage Change-Point Detection Scheme by Weighting Alerts based on False-Positive Rate, IEEE Communications Society Communications Quality and Reliability Workshop 2009 (CQR 2009), CD-ROM (6 pages), May 2009.

  33. Yukinobu Fukushima, Kota Tanaka and Tokumi Yokohira, Performance Evaluation of Medium Access Control Methods in Light Trail Networks, International Conference on Advanced Communication Technology 2009 (ICACT 2009), pp. 1421-1425, Feb. 2009.

  34. Tutomu Murase, Yukinobu Fukushima, Masayoshi Kobayashi, Sakiko Nishimoto, Ryohei Fujimaki and Tokumi Yokohira, Performance Evaluation of Multi-Stage Change-Point Detection Scheme against DDoS Attacks by Random Scan Worms, IEEE Communications Society Communications Quality and Reliability Workshop 2008 (CQR 2008), CD-ROM (6 pages), Apr. 2008.

  35. Tutomu Murase, Yukinobu Fukushima, Masayoshi Kobayashi, Hiroki Fujiwara, Ryouhei Fujimaki and Tokumi Yokohira, Performance Evaluation of a Multi-stage Network Event Detection Scheme against DDoS Attacks, The Seventh Asia-Pacific Symposium on Information and Telecommunication Technologies (APSITT 2008), pp. 118-123, Apr. 2008.

  36. Yuichi Nisida, Hui Wang, Hiroaki Matsumoto, Tokumi Yokohira and Yukinobu Fukushima, Retransmission Control in a TCP with a Performance Enhancing Proxy, International Conference on Advanced Communication Technology 2008 (ICACT 2008), pp. 1881-1886, Feb. 2008.

  37. Yukinobu Fukushima, Takahiro Ooishi and Tokumi Yokohira, A Wavelength and Converter Assignment Scheme for Decreasing Blocking Probability in Wavelength-Routed Networks, The 12th OptoElectronics and Communication Conference and The 16th International Conference on Integrated Optics and Optical Fiber Communication (OECC/IOCC 2007), pp. 454-455, July 2007.

  38. Tutomu Murase, Hiroki Fujiwara, Yukinobu Fukushima, Masayoshi Kobayashi and Tokumi Yokohira, Performance Evaluation of a Multi-Stage Network Event Detection Scheme for Decreasing the False-Positive Rate against a Large Number of Simultaneous, Unknown Events, The Sixth International Conference of Networking (ICN 2007)in the Conference CD-ROM (6 pages), Apr. 2007.

  39. Nobuto Watanabe, Wang Hui, Shigeyuki Osada, Tokumi Yokohira and Yukinobu Fukushima, A Throughput Optimization Algorithm for TCP Connections with Different Routes in Long-Delay Satellite Environments, The 25th AIAA International Communications Satellite Systems Conference (ICSSC 2007), Paper No. AIAA 2007-3208 in the Conference CD-ROM (12 pages), Apr. 2007.

  40. Yukinobu Fukushima, Tokumi Yokohira, Yasuhiro Noine and Kazuteru Nagahara, A Burst Assembly Method for Decreasing End-to-end Packet Delays in Optical Burst Switching Networks, International Conference on Communication Technology (ICCT 2006), Vol. I, pp. 459-462, Nov. 2006.

  41. Shigeyuki Osada, Wang Hui, Tokumi Yokohira and Yukinobu Fukushima, Kiyohiko Okayama and Nariyoshi Yamai, Throughput Optimization in TCP with a Performance Enhancing Proxy, International Conference on Communication Technology (ICCT 2006), Vol. I, pp. 392-397, Nov. 2006.

  42. Wang Hui, Shigeyuki Osada, Tokumi Yokohira, Yukinobu Fukushima, Deng Chaolong, Kiyohiko Okayama and Nariyoshi Yamai, Throughput Optimization for TCP with an Active Proxy in Long-Delay Satellite Environments, 2006 Joint Conference on Satellite Communications (JC-SAT 2006), pp. 125-130, Oct. 2006.

  43. Tokumi Yokohira, Kiyohiko Okayama, Takashi Murakami and Kayo Takarako, A Framework for Mobile Agent Systems with the Capability of Preceding and Following Users, The Sixth Asia-Pacific Symposium on Information and Telecommunication Technologies (APSITT 2005), pp. 89-94, Nov. 2005.

  44. Shigeyuki Osada, Tokumi Yokohira, Wang Hui, Kiyohiko Okayama and Nariyoshi Yamai, Performance Improvement of TCP using Performance Enhancing Proxies --- Effect of Premature ACK Transmission Timing on Throughput --- The Sixth Asia-Pacific Symposium on Information and Telecommunication Technologies (APSITT 2005), pp. 7-12, Nov. 2005.

  45. Hiroyuki Michinishi, Tokumi Yokohira, Takuji Okamato, Toshifumi Kobayashi and Tsutomu Hondou, CMOS Floating Gate Defect Detection Using IDDQ Test with DC Power Supply Superposed by AC component, Eleventh Asian Test Symposium (ATS '02), pp. 417-422, Nov. 2002.

  46. Nobuo Funabiki, Toru Nakanishi, Tokumi Yokohira, Shigeto Tajima and Teruo Higashino, A Proposal of a Quasi-Solution State Evaluation Algorithm for Channel Assignment Problems, International Conference on Information Networks (ICOIN) 2002, pp. 6B2.1-2.10, Jan./Feb. 2002.

  47. Nobuo Funabiki, Tokumi Yokohira, Toru Nakanishi, Shigeto Tajima and Teruo Higashino, A Minimal-state Processing Search Algorithm for satisfiability problems, IEEE International Conference on System, Man, and Cybernetics, pp. 2769-2774, October 2001.

  48. Kazuaki Jikuya, Tokumi Yokohira, Takuji Okamoto and Ken Akashi, Quantitative Analysis of Knee-Joint Spasticity by Pendulum Test, The Fourth Asia-Pacific Conference on Medical and Biological Engineering, p. 122, Sep. 1999.

  49. Hiroyuki Michinishi, Tokumi Yokohira, Takuji Okamoto, Tomoo Inoue and Hideo Fujiwara, Testing for the Programming Circuit of LUT-Based FPGAs, The Sixth Asian Test Symposium (ATS '97), pp. 242-247, November 1997.

  50. Hiroyuki Michinishi, Tokumi Yokohira, Takuji Okamoto, Tomoo Inoue and Hideo Fujiwara, A Test Methodology for Interconnect Structures of LUT-based FPGAs, The Fifth Asian Test Symposium (ATS '96), pp. 68-74, November 1996.

  51. Tomoo Inoue, Hideo Fujiwara, Hiryouki Michinishi, Tokumi Yokohira and Takuji Okamoto, Universal Test Complexity of Field-Programmable Gate Arrays, The Fourth Asian Test Symposium (ATS '95) pp. 259-265, November 1995．

  52. Hiroyuki Michinishi, Tokumi Yokohira and Takuji Okamoto,Minimum Verification Test Set for Combinational Circuits, The First Asian Test Symposium (ATS '92), pp. 14-19, Nov. 1992.

  53. Kazuaki Jikuya, Takuji Okamoto, Tokumi Yokohira and Ken Akashi, Simulation of Knee Joint Motions in Spastic and Rigid Patients, The XIIIth International Congress on Biomechanics, pp. 273-275, Dec. 1991.

  54. Hiroshi Inai, Takeshi Nishida, Tokumi Yokohira and Hideo Miyahara, End-to-End Performance Modeling for Layered Communication Protocol, IEEE INFOCOM '90, Vol. 2, pp. 442-449, June 1990.

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