Ryoichi Kawahara

Researcher Information

Research funding number

• 40822979

J-Global ID

• 201801013826406367

Research Areas

• Informatics / Information networks

Published Papers

• Link delay estimation under undeterministic routing using neural network

  Ushizuka Yuta; Kawahara Ryoichi

  IEICE Communications Express The Institute of Electronics, Information and Communication Engineers 13 (1) 5 - 8 2024/01 [Refereed]
  
• Optimizing Edge-Cloud Cooperation for Machine Learning Accuracy Considering Transmission Latency and Bandwidth Congestion.

  Kengo Tajiri; Ryoichi Kawahara; Yoichi Matsuo

  IEICE Transactions on Communications 106 (9) 827 - 836 2023/09 [Refereed]
  
• Optimizing Data Distribution for Federated Learning Under Bandwidth Constraint.

  Kengo Tajiri; Ryoichi Kawahara

  ICC 3732 - 3737 2023 [Refereed]
  
• Data Transfer for Balancing Model Convergence and Training Time in Federated Learning.

  Kengo Tajiri; Ryoichi Kawahara

  GLOBECOM 6777 - 6782 2023 [Refereed]
  
• A general-purpose calculation module for route optimization in virtualized networks

  Takefumi Wakayama; Ryoichi Kawahara

  IEICE COMMUNICATIONS EXPRESS IEICE-INST ELECTRONICS INFORMATION COMMUNICATION ENGINEERS 11 (12) 840 - 845 2187-0136 2022 [Refereed]
  
• Optimizing Edge-Cloud Cooperation for Machine Learning Accuracy Considering Transmission Latency and Bandwidth Congestion.

  Kengo Tajiri; Ryoichi Kawahara; Yoichi Matsuo

  NOMS 1 - 9 2022 [Refereed]
  
• Network Tomography for Information-Centric Networking

  Ryoichi Kawahara; Takuya Yano; Rie Tagyo; Daisuke Ikegami

  IEICE Trans. Commun. 105-B (3) 259 - 269 2022 [Refereed]
  
• Cooperative Multi-Agent Deep Reinforcement Learning for Dynamic Virtual Network Allocation with Traffic Fluctuations

  Akito Suzuki; Ryoichi Kawahara; Shigeaki Harada

  IEEE Transactions on Network and Service Management 19 (3) 1982 - 2000 2022 [Refereed]
  
• Virtual Network Control for Power Bills Reduction and Network Stability

  Ryota Nakamura; Ryoichi Kawahara; Takefumi Wakayama; Shigeaki Harada

  IEEE Transactions on Network and Service Management 19 (4) 4338 - 4349 2022 [Refereed]
  
• Network tomography using routing probability for undeterministic routing

  Rie Tagyo; Daisuke Ikegami; Ryoichi Kawahara

  IEICE Transactions on Communications E104B (7) 837 - 848 0916-8516 2021 [Refereed]
  
• Cooperative Multi-Agent Deep Reinforcement Learning for Dynamic Virtual Network Allocation.

  Akito Suzuki; Ryoichi Kawahara; Shigeaki Harada

  30th International Conference on Computer Communications and Networks(ICCCN) IEEE 1 - 11 2021 [Refereed]
  
• Extendable NFV-Integrated Control Method Using Reinforcement Learning.

  Akito Suzuki; Ryoichi Kawahara; Masahiro Kobayashi; Shigeaki Harada; Yousuke Takahashi; Keisuke Ishibashi

  IEICE Trans. Commun. 103-B (8) 826 - 841 2020 [Refereed]
  
• Modeling Upper Layer Reaction to QoS Degradation as a Congestion Avoidance Mechanism

  HARADA Shigeaki; ISHIBASHI Keisuke; KAWAHARA Ryoichi

  IEICE Transactions on Communications The Institute of Electronics, Information and Communication Engineers 103 (4) 302 - 311 0916-8516 2020 [Refereed][Invited]
  
• Inferring Latent Traffic Demand Offered to an Overloaded Link with Modeling QoS-Degradation Effect

  ISHIBASHI Keisuke; HARADA Shigeaki; KAWAHARA Ryoichi

  IEICE Transactions on Communications The Institute of Electronics, Information and Communication Engineers 102 (4) 790 - 798 0916-8516 2019 [Refereed]
  
• Human-Assisted Online Anomaly Detection with Normal Outlier Retraining

  Yasuhiro Ikeda; Keisuke Ishibashi; Yusuke Nakano; Keishiro Watanabe; Kengo Tajiri; Ryoichi Kawahara

  Outlier Detection De-constructed (ODD) v5.0, ACM SIGKDD 2018 Workshop, Poster session 2018/08 [Refereed]
  
• Workflow extraction for service operation using multiple unstructured trouble tickets

  Akio Watanabe; Keisuke Ishibashi; Tsuyoshi Toyono; Keishiro Watanabe; Tatsuaki Kimura; Yoichi Matsuo; Kohei Shiomoto; Ryoichi Kawahara

  IEICE Transactions on Information and Systems Institute of Electronics, Information and Communication, Engineers, IEICE E101D (4) 1030 - 1041 1745-1361 2018/04 [Refereed]
  
• System design for predictive road-traffic information delivery using edge-cloud computing

  Ryoichi Shinkuma; Shingo Kato; Masahiro Kanbayashi; Yasuhiro Ikeda; Ryoichi Kawahara; Takanori Hayashi

  CCNC 2018 - 2018 15th IEEE Annual Consumer Communications and Networking Conference Institute of Electrical and Electronics Engineers Inc. 2018- 1 - 6 2018/03 [Refereed]
  
• Application of AI to Network Operation

  Kawahara Ryoichi; Watanabe Keishiro; Harada Shigeaki; Kawata Takehiro

  IEICE Communications Society Magazine The Institute of Electronics, Information and Communication Engineers 12 (1) 29 - 38 2018 [Refereed][Invited]
  
• Network Tomography Using Routing Probability for Virtualized Network.

  Rie Tagyo; Daisuke Ikegami; Ryoichi Kawahara

  2018 IEEE International Conference on Communications, ICC 2018, Kansas City, MO, USA, May 20-24, 2018 IEEE 1 - 7 2018 [Refereed]
  
• Extendable NFV-Integrated Control Method Using Reinforcement Learning.

  Akito Suzuki; Masahiro Kobayashi; Yousuke Takahashi; Shigeaki Harada; Keisuke Ishibashi; Ryoichi Kawahara

  2018 IEEE International Conference on Communications, ICC 2018, Kansas City, MO, USA, May 20-24, 2018 IEEE 1 - 7 2018 [Refereed]
  
• Root-Cause Diagnosis for Rare Failures Using Bayesian Network with Dynamic Modification.

  Yoichi Matsuo; Yuusuke Nakano; Akio Watanabe; Keishiro Watanabe; Keisuke Ishibashi; Ryoichi Kawahara

  2018 IEEE International Conference on Communications, ICC 2018, Kansas City, MO, USA, May 20-24, 2018 IEEE 1 - 6 2018 [Refereed]
  
• Root-Cause Diagnosis Using Logs Generated by User Actions.

  Hiroki Ikeuchi; Akio Watanabe; Takehiro Kawata; Ryoichi Kawahara

  IEEE Global Communications Conference, GLOBECOM 2018, Abu Dhabi, United Arab Emirates, December 9-13, 2018 IEEE 1 - 7 2018 [Refereed]
  
• Disaster avoidance control against heavy rainfall

  Hiroshi Saito; Hirotada Honda; Ryoichi Kawahara

  Proceedings - IEEE INFOCOM IEEE 1 - 9 0743-166X 2017/10 [Refereed]
  
• Geometrical Characterization of Offloading through Wireless LANs

  Hiroshi Saito; Ryoichi Kawahara

  IEEE TRANSACTIONS ON MOBILE COMPUTING IEEE COMPUTER SOC 16 (1) 130 - 142 1536-1233 2017/01 [Refereed]
  
• Name Resolution Based on Set of Attribute-Value Pairs of Real-World Information

  Ryoichi Kawahara; Hiroshi Saito

  IEICE TRANSACTIONS ON COMMUNICATIONS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E100B (1) 110 - 121 0916-8516 2017/01 [Refereed]
  
• Modeling Urban ITS Communication via Stochastic Geometry Approach.

  Tatsuaki Kimura; Hiroshi Saito; Hirotada Honda; Ryoichi Kawahara

  IEEE 84th Vehicular Technology Conference, VTC Fall 2016, Montreal, QC, Canada, September 18-21, 2016 IEEE 1 - 5 2016 [Refereed]
  
• Generating a network reliability formula by using binary decision diagrams

  Ikeda Yasuhiro; Kawahara Ryoichi; Saito Hiroshi

  IEICE Communications Express The Institute of Electronics, Information and Communication Engineers 4 (9) 299 - 303 2187-0136 2015 [Refereed]
  
• Homology-based Metaheuristics for Cell Planning with Macroscopic Diversity using Sector Antennas

  Yasuhiro Ikeda; Ryoichi Kawahara; Hiroshi Saito

  2015 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC) IEEE 3442 - 3447 1550-3607 2015 [Refereed]
  
• Proposal of disaster avoidance control

  Hiroshi Saito; Ryoichi Kawahara; Takeshi Fukumoto

  2014 16th International Telecommunications Network Strategy and Planning Symposium, Networks 2014 2014/11 [Refereed]
  
• An Online Framework for Flow Round Trip Time Measurement

  Xinjie Guan; Xili Wan; Ryoichi Kawahara; Hiroshi Saito

  IEICE TRANSACTIONS ON COMMUNICATIONS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E97B (10) 2145 - 2156 0916-8516 2014/10 [Refereed]
  
• Loss Recovery Method for Content Pre-distribution in VoD Service

  N. Kamiyama; R. Kawahara; T. Mori

  Proceedings of the World Telecommunications Congress 1 - 6 2014/06 [Refereed]
  
• Cell Planning with Macroscopic Diversity: Optimal Cell Deployment and SINR Evaluation under Frequency Scheduling

  Yasuhiro Ikeda; Hiroshi Saito; Ryoichi Kawahara

  2014 IEEE 79TH VEHICULAR TECHNOLOGY CONFERENCE (VTC-SPRING) IEEE 1 - 5 1550-2252 2014 [Refereed]
  
• Mobile QoS tomography using compressed sensing

  Ryoichi Kawahara; Yoshihide Tonomura

  2014 26TH INTERNATIONAL TELETRAFFIC CONGRESS (ITC) IEEE 1 - 9 2014 [Refereed]
  
• Optimum profit allocation in coalitional VoD service

  Noriaki Kamiyama; Ryoichi Kawahara; Haruhisa Hasegawa

  COMPUTER NETWORKS ELSEVIER SCIENCE BV 57 (15) 3081 - 3097 1389-1286 2013/10 [Refereed]
  
• Optimally Identifying Worm-Infected Hosts

  Noriaki Kamiyama; Tatsuya Mori; Ryoichi Kawahara; Shigeaki Harada

  IEICE TRANSACTIONS ON COMMUNICATIONS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E96B (8) 2084 - 2094 0916-8516 2013/08 [Refereed]
  
• Multicast Pre-Distribution VoD System

  Noriaki Kamiyama; Ryoichi Kawahara; Tatsuya Mori; Haruhisa Hasegawa

  IEICE TRANSACTIONS ON COMMUNICATIONS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E96B (6) 1459 - 1471 0916-8516 2013/06 [Refereed]
  
• Mean-variance relationship of the number of flows in traffic aggregation and its application to traffic management

  Ryoichi Kawahara; Tetsuya Takine; Tatsuya Mori; Noriaki Kamiyama; Keisuke Ishibashi

  COMPUTER NETWORKS ELSEVIER SCIENCE BV 57 (6) 1560 - 1576 1389-1286 2013/04 [Refereed]
  
• Analyzing influence of network topology on designing ISP-operated CDN

  Noriaki Kamiyama; Tatsuya Mori; Ryoichi Kawahara; Shigeaki Harada; Haruhisa Hasegawa

  TELECOMMUNICATION SYSTEMS SPRINGER 52 (2) 969 - 977 1018-4864 2013/02 [Refereed]
  
• Autonomic load balancing of flow monitors

  Noriaki Kamiyama; Tatsuya Mori; Ryoichi Kawahara

  COMPUTER NETWORKS ELSEVIER SCIENCE BV 57 (3) 741 - 761 1389-1286 2013/02 [Refereed]
  
• An online framework for flow round trip time measurement

  Xinjie Guan; Xili Wan; Ryoichi Kawahara; Hiroshi Saito

  Proceedings of the 2013 25th International Teletraffic Congress, ITC 2013 IEEE Computer Society 1 - 4 2013 [Refereed]
  
• A periodic combined-content distribution mechanism in peer-assisted content delivery networks.

  Naoya Maki; Ryoichi Shinkuma; Tatsuya Mori; Noriaki Kamiyama; Ryoichi Kawahara

  Proceedings of the 2013 ITU Kaleidoscope: Building Sustainable Communities, Kyoto, Japan, April 22-24, 2013 IEEE 1 - 8 2013 [Refereed]
  
• Analysis of Content Charge by ISPs

  Noriaki Kamiyama; Ryoichi Kawahara

  2013 IFIP/IEEE INTERNATIONAL SYMPOSIUM ON INTEGRATED NETWORK MANAGEMENT (IM 2013) IEEE 427 - 434 2013 [Refereed]
  
• Expected traffic reduction by content-oriented incentive in peer-assisted content delivery networks.

  Naoya Maki; Takayuki Nishio; Ryoichi Shinkuma; Tatsuro Takahashi; Tatsuya Mori; Noriaki Kamiyama; Ryoichi Kawahara

  The International Conference on Information Networking 2013, ICOIN 2013, Bangkok, Thailand, January 28-30, 2013 IEEE Computer Society 450 - 455 2013 [Refereed]
  
• Optimally designing ISP-operated CDN

  Noriaki Kamiyama; Tatsuya Mori; Ryoichi Kawahara; Haruhisa Hasegawa

  IEICE Transactions on Communications Institute of Electronics, Information and Communication, Engineers, IEICE E96-B (3) 790 - 801 1745-1345 2013 [Refereed]
  
• Analyzing characteristics of TCP quality metrics with respect to type of connection through measured traffic data

  Yasuhiro Ikeda; Ryoichi Kawahara; Noriaki Kamiyama; Tatsuaki Kimura; Tatsuya Mori

  IEICE Transactions on Communications Institute of Electronics, Information and Communication, Engineers, IEICE E96-B (2) 533 - 542 1745-1345 2013 [Refereed]
  
• Effect of Limiting Pre-Distribution and Clustering Users on Multicast Pre-Distribution VoD

  Noriaki Kamiyama; Ryoichi Kawahara; Tatsuya Mori; Haruhisa Hasegawa

  IEICE TRANSACTIONS ON COMMUNICATIONS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E96B (1) 143 - 154 0916-8516 2013/01 [Refereed]
  
• Traffic Engineering of Peer-Assisted Content Delivery Network with Content-Oriented Incentive Mechanism

  Naoya Maki; Takayuki Nishio; Ryoichi Shinkuma; Tatsuya Mori; Noriaki Kamiyama; Ryoichi Kawahara; Tatsuro Takahashi

  IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E95D (12) 2860 - 2869 1745-1361 2012/12 [Refereed]
  
• Analyzing and Reducing the Impact of Traffic on Large-Scale NAT

  Ryoichi Kawahara; Tatsuya Mori; Takeshi Yada; Noriaki Kamiyama

  IEICE TRANSACTIONS ON COMMUNICATIONS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E95B (9) 2815 - 2827 0916-8516 2012/09 [Refereed]
  
• Effects of Sampling and Spatio/Temporal Granularity in Traffic Monitoring on Anomaly Detectability

  Keisuke Ishibashi; Ryoichi Kawahara; Tatsuya Mori; Tsuyoshi Kondoh; Shoichiro Asano

  IEICE TRANSACTIONS ON COMMUNICATIONS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E95B (2) 466 - 476 0916-8516 2012/02 [Refereed]
  
• Autonomic load balancing for flow monitoring.

  Noriaki Kamiyama; Tatsuya Mori; Ryoichi Kawahara

  Proceedings of IEEE International Conference on Communications, ICC 2012, Ottawa, ON, Canada, June 10-15, 2012 IEEE 2684 - 2688 2012 [Refereed]
  
• Detection accuracy of network anomalies using sampled flow statistics

  Ryoichi Kawahara; Keisuke Ishibashi; Tatsuya Mori; Noriaki Kamiyama; Shigeaki Harada; Haruhisa Hasegawa; Shoichiro Asano

  INTERNATIONAL JOURNAL OF NETWORK MANAGEMENT WILEY-BLACKWELL 21 (6) 513 - 535 1055-7148 2011/11 [Refereed]
  
• Parallel video streaming optimizing network throughput

  Noriaki Kamiyama; Ryoichi Kawahara; Tatsuya Mori; Shigeaki Harada; Haruhisa Hasegawa

  COMPUTER COMMUNICATIONS ELSEVIER SCIENCE BV 34 (10) 1182 - 1194 0140-3664 2011/07 [Refereed]
  
• Multicast Pre-Distribution in VoD Services

  Noriaki Kamiyama; Ryoichi Kawahara; Tatsuya Mori; Haruhisa Hasegawa

  IEEE CQR 2011 2011/05 [Refereed]
  
• Optimally designing caches to reduce P2P traffic

  Noriaki Kamiyama; Ryoichi Kawahara; Tatsuya Mori; Shigeaki Harada; Haruhisa Hasegawa

  COMPUTER COMMUNICATIONS ELSEVIER SCIENCE BV 34 (7) 883 - 897 0140-3664 2011/05 [Refereed]
  
• Traffic engineering using overlay network

  Ryoichi Kawahara; Shigeaki Harada; Noriaki Kamiyama; Tatsuya Mori; Haruhisa Hasegawa; Akihiro Nakao

  IEEE International Conference on Communications 0536-1486 2011 [Refereed]
  
• Limiting pre-distribution and clustering users on multicast pre-distribution VoD

  Noriaki Kamiyama; Ryoichi Kawahara; Tatsuya Mori; Haruhisa Hasegawa

  Proceedings of the 12th IFIP/IEEE International Symposium on Integrated Network Management, IM 2011 IEEE 706 - 709 2011 [Refereed]
  
• Traffic engineering using overlay network

  Ryoichi Kawahara; Shigeaki Harada; Noriaki Kamiyama; Tatsuya Mori; Haruhisa Hasegawa; Akihiro Nakao

  2011 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC) IEEE 1 - 6 1550-3607 2011 [Refereed]
  
• Performance evaluation of peer-assisted content distribution

  Ryoichi Kawahara; Noriaki Kamiyama; Tatsuya Mori; Haruhisa Hasegawa

  2011 IEEE Consumer Communications and Networking Conference, CCNC'2011 IEEE 725 - 729 2011 [Refereed]
  
• Detecting Anomalous Traffic using Communication Graphs

  K.Ishibashi; T. Kondoh; S. Harada; T. Mori; R. Kawahara; S. Asano

  World Telecommunications Congress (WTC) 2010 2010/09 [Refereed]
  
• Analyzing influence of network topology on designing ISP-operated CDN

  Noriaki Kamiyama; Tatsuya Mori; Ryoichi Kawahara; Shigeaki Harada; Haruhisa Hasegawa

  Proceedings of 2010 14th International Telecommunications Network Strategy and Planning Symposium, Networks 2010 2010 [Refereed]
  
• Optimally designing capacity and location of caches to reduce P2P traffic

  Noriaki Kamiyama; Ryoichi Kawahara; Tatsuya Mori; Shigeaki Harada; Haruhisa Hasegawa

  IEEE International Conference on Communications 0536-1486 2010 [Refereed]
  
• Characterizing Traffic Flows Originating from Large-Scale Video Sharing Services

  Tatsuya Mori; Ryoichi Kawahara; Haruhisa Hasegawa; Shinsuke Shimogawa

  TRAFFIC MONITORING AND ANALYSIS, PROCEEDINGS SPRINGER-VERLAG BERLIN 6003 17 - 31 0302-9743 2010 [Refereed]
  
• Impact of Topology on Parallel Video Streaming

  Noriaki Kamiyama; Ryoichi Kawahara; Tatsuya Mori; Shigeaki Harada; Haruhisa Hasegawa

  PROCEEDINGS OF THE 2010 IEEE-IFIP NETWORK OPERATIONS AND MANAGEMENT SYMPOSIUM IEEE 607 - 614 1542-1201 2010 [Refereed]
  
• Profit allocation in coalitional VoD service

  Noriaki Kamiyama; Ryoichi Kawahara; Haruhisa Hasegawa

  Proceedings - 18th Annual IEEE/ACM International Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems, MASCOTS 2010 IEEE Computer Society 111 - 120 2010 [Refereed]
  
• Optimally Designing Capacity and Location of Caches to Reduce P2P Traffic.

  Noriaki Kamiyama; Ryoichi Kawahara; Tatsuya Mori; Shigeaki Harada; Haruhisa Hasegawa

  Proceedings of IEEE International Conference on Communications, ICC 2010, Cape Town, South Africa, 23-27 May 2010 IEEE 1 - 6 2010 [Refereed]
  
• Analyzing Influence of Network Topology on Effect of Parallel Download

  KAMIYAMA Noriaki; KAWAHARA Ryoichi; HASEGAWA Haruhisa

  The IEICE transactions on communications B The Institute of Electronics, Information and Communication Engineers 92 (11) 1764 - 1777 1344-4697 2009/11 [Refereed]
  
• Efficient File Sharing Method in P2P Network Based on Residual File Transfer Load

  KAWARASAKI Masatoshi; KAWAHARA Ryoichi; OHNUMA Tomohiro; SUZUKI Kei

  The IEICE transactions on communications B The Institute of Electronics, Information and Communication Engineers 92 (8) 1212 - 1224 1344-4697 2009/08 [Refereed]
  
• Adaptive bandwidth control to handle long-duration large flows

  Ryoichi Kawahara; Tatsuya Mori; Noriaki Kamiyama; Shigeaki Harada; Haruhisa Hasegawa

  IEEE International Conference on Communications 0536-1486 2009 [Refereed]
  
• ISP-Operated CDN

  Noriaki Kamiyama; Tatsuya Mori; Ryoichi Kawahara; Shigeaki Harada; Haruhisa Hasegawa

  IEEE INFOCOM 2009 - IEEE CONFERENCE ON COMPUTER COMMUNICATIONS WORKSHOPS IEEE 49 - 54 2009 [Refereed]
  
• On the Quality of Triangle Inequality Violation Aware Routing Overlay Architecture.

  Ryoichi Kawahara; Eng Keong Lua; Masato Uchida; Satoshi Kamei; Hideaki Yoshino

  INFOCOM 2009. 28th IEEE International Conference on Computer Communications, Joint Conference of the IEEE Computer and Communications Societies, 19-25 April 2009, Rio de Janeiro, Brazil IEEE 2761 - 2765 2009 [Refereed]
  
• Adaptive Bandwidth Control to Handle Long-Duration Large Flows.

  Ryoichi Kawahara; Tatsuya Mori; Noriaki Kamiyama; Shigeaki Harada; Haruhisa Hasegawa

  Proceedings of IEEE International Conference on Communications, ICC 2009, Dresden, Germany, 14-18 June 2009 IEEE 1 - 6 2009 [Refereed]
  
• Improving Deployability of Peer-Assisted CDN Platform with Incentive.

  Tatsuya Mori; Noriaki Kamiyama; Shigeaki Harada; Haruhisa Hasegawa; Ryoichi Kawahara

  Proceedings of the Global Communications Conference, 2009. GLOBECOM 2009, Honolulu, Hawaii, USA, 30 November - 4 December 2009 IEEE 1 - 7 2009 [Refereed]
  
• A Method of Constructing QoS Overlay Network and Its Evaluation.

  Ryoichi Kawahara; Satoshi Kamei; Noriaki Kamiyama; Haruhisa Hasegawa; Hideaki Yoshino; Eng Keong Lua; Akihiro Nakao

  Proceedings of the Global Communications Conference, 2009. GLOBECOM 2009, Honolulu, Hawaii, USA, 30 November - 4 December 2009 IEEE 1 - 6 2009 [Refereed]
  
• Inconsistency of logical and physical topologies for overlay networks and its effect on file transfer delay

  Yasuo Tamura; Shoji Kasahara; Yutaka Takahashi; Satoshi Kamei; Ryoichi Kawahara

  PERFORMANCE EVALUATION ELSEVIER SCIENCE BV 65 (10) 725 - 741 0166-5316 2008/10 [Refereed]
  
• Network topology design considering detour traffic caused by link failure

  N. Kamiyama; R. Kawahara; H. Yoshino

  Networks 2008 - The 13th International Telecommunications Network Strategy and Planning Symposium CDROM 2008/09 [Refereed]
  
• Finding cardinality heavy-hitters in mussive traffic data and its application to anomaly detection

  Keisuke Ishibashi; Tatsuya Mori; Ryoichi Kawarara; Yutaka Hrrokawa; Atsushi Kobayashi; Kimihiro Yamamoto; Hitoaki Sakamoto; Shoichiro Asano

  IEICE TRANSACTIONS ON COMMUNICATIONS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E91B (5) 1331 - 1339 0916-8516 2008/05 [Refereed]
  
• Packet sampling TCP flow rate estimation and performance degradation detection method

  Ryoichi Kawahara; Tatsuya Mori; Keisuke Ishibashi; Noriaki Kamiyama; Hideaki Yoshino

  IEICE TRANSACTIONS ON COMMUNICATIONS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E91B (5) 1309 - 1319 0916-8516 2008/05 [Refereed]
  
• Performance evaluation of parallel download in streaming services

  Noriaki Kamiyama; Ryoichi Kawahara; Haruhisa Hasegawa

  CSNDSP 08: PROCEEDINGS OF THE SIXTH INTERNATIONAL SYMPOSIUM ON COMMUNICATION SYSTEMS, NETWORKS AND DIGITAL SIGNAL PROCESSING IEEE 208 - 212 2008 [Refereed]
  
• Extracting worm-infected hosts using white list

  Noriaki Kamiyama; Tatsuya Mori; Ryoichi Kawahara; Shigeaki Harada; Hideaki Yoshino

  Proceedings - 2008 International Symposium on Applications and the Internet, SAINT 2008 IEEE Computer Society 68 - 75 2008 [Refereed]
  
• Optimum Identification of Worm-Infected Hosts

  Noriaki Kamiyama; Tatsuya Mori; Ryoichi Kawahara; Shigeaki Harada

  IP OPERATIONS AND MANAGEMENT, PROCEEDINGS SPRINGER-VERLAG BERLIN 5275 103 - 116 0302-9743 2008 [Refereed]
  
• A Method of Detecting Network Anomalies in Cyclic Traffic

  Shigeaki Harada; Ryoichi Kawahara; Tatsuya Mori; Noriaki Kamiyama; Haruhisa Hasegawa; Hideaki Yoshino

  GLOBECOM 2008 - 2008 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE IEEE 2057 - 2061 1930-529X 2008 [Refereed]
  
• Identifying anomalous traffic sources using flow statistics

  Ryoichi Kawahara; Noriaki Kamiyama; Shigeaki Harada; Haruhisa Hasegawa; Shoichiro Asano

  GLOBECOM 2008 - 2008 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE IEEE 1509 - 1513 1930-529X 2008 [Refereed]
  
• Detection of Leaps/sLumps in Traffic Volume of Internet Backbone.

  Yutaka Hirokawa; Kimihiro Yamamoto; Shigeaki Harada; Ryoichi Kawahara

  Challenges for Next Generation Network Operations and Service Management, 11th Asia-Pacific Network Operations and Management Symposium, APNOMS 2008, Beijing, China, October 22-24, 2008. Proceedings Springer 409 - 418 2008 [Refereed]
  
• Identifying heavy-hitter flows from sampled flow statistics

  Tatsuya Mori; Tetsuya Takine; Jianping Pan; Ryoichi Kawahara; Masato Uchida; Shigeki Goto

  IEICE TRANSACTIONS ON COMMUNICATIONS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E90B (11) 3061 - 3072 0916-8516 2007/11 [Refereed]
  
• Effect of sampling rate and monitoring granularity on anomaly detectability

  Keisuke Ishibashi; Ryoichi Kawahara; Mori Tatsuya; Tsuyoshi Kondoh; Shoichiro Asano

  2007 IEEE GLOBAL INTERNET SYMPOSIUM IEEE 25 - + 2007 [Refereed]
  
• Inferring original traffic pattern from sampled flow statistics

  Tatsuya Mori; Ryoichi Kawahara; Noriaki Kamiyama; Shigeaki Harada

  SAINT - 2007 International Symposium on Applications and the Internet - Workshops, SAINT-W IEEE Computer Society 85  2007 [Refereed]
  
• 2-D bitmap for summarizing inter-host communication patterns

  Keisuke Ishibashi; Tatsuya Mori; Ryoichi Kawahara; Katsuyasu Toyama; Shunichi Osawa; Shoichiro Asano

  SAINT - 2007 International Symposium on Applications and the Internet - Workshops, SAINT-W IEEE Computer Society 83  2007 [Refereed]
  
• A study on detecting network anomalies using sampled flow statistics

  Ryoichi Kawahara; Tatsuya Mori; Noriaki Kamiyama; Shigeaki Harada; Shoichiro Asano

  SAINT - 2007 International Symposium on Applications and the Internet - Workshops, SAINT-W IEEE Computer Society 81  2007 [Refereed]
  
• Simple and Adaptive Identification of Superspreaders by Flow Sampling.

  Noriaki Kamiyama; Tatsuya Mori; Ryoichi Kawahara

  INFOCOM 2007. 26th IEEE International Conference on Computer Communications, Joint Conference of the IEEE Computer and Communications Societies, 6-12 May 2007, Anchorage, Alaska, USA IEEE 2481 - 2485 2007 [Refereed]
  
• Efficient timeout checking mechanism for traffic control

  Noriaki Kamiyama; Tatsuya Mori; Ryoichi Kawahara; Eng Keong Lua

  PROCEEDINGS - 16TH INTERNATIONAL CONFERENCE ON COMPUTER COMMUNICATIONS AND NETWORKS, VOLS 1-3 IEEE 327 - 333 1095-2055 2007 [Refereed]
  
• Detection Accuracy of Network Anomalies Using Sampled Flow Statistics.

  Ryoichi Kawahara; Keisuke Ishibashi; Tatsuya Mori; Noriaki Kamiyama; Shigeaki Harada; Shoichiro Asano

  Proceedings of the Global Communications Conference, 2007. GLOBECOM '07, Washington, DC, USA, 26-30 November 2007 IEEE 1959 - 1964 2007 [Refereed]
  
• QoS-aware overlay routing with limited number of alternative route candidates and its evaluation

  Masato Uchida; Satoshi Kamei; Ryoichi Kawahara; Takeo Abe

  IEICE TRANSACTIONS ON COMMUNICATIONS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E89B (9) 2361 - 2374 0916-8516 2006/09 [Refereed]
  
• QoS control to handle long-duration large flows and its performance evaluation

  Ryoichi Kawahara; Tatsuya Mori; Takeo Abe

  IEEE International Conference on Communications 2 579 - 584 0536-1486 2006 [Refereed]
  
• Performance evaluation of QoS-aware routing in overlay network

  Masato Uchida; Satoshi Kamei; Ryoichi Kawahara

  INFORMATION NETWORKING SPRINGER-VERLAG BERLIN 3961 925 - 934 0302-9743 2006 [Refereed]
  
• Estimating top N hosts in cardinality using small memory resources

  Keisuke Ishibashi; Tatsuya Mori; Ryoichi Kawahara; Yutaka Hirokawa; Atsushi Kobayashi; Kimihiro Yamamoto; Hitoaki Sakamoto

  ICDEW 2006 - Proceedings of the 22nd International Conference on Data Engineering Workshops Institute of Electrical and Electronics Engineers Inc. 29  2006 [Refereed]
  
• QoS control to handle long-duration large flows and its performance evaluation

  Ryoichi Kawahara; Tatsuya Mori; Takeo Abe

  2006 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, VOLS 1-12 IEEE 579 - 584 1550-3607 2006 [Refereed]
  
• Estimating Flow Rate from Sampled Packet Streams for Detection of Performance Degradation at TCP Flow Level.

  Ryoichi Kawahara; Tatsuya Mori; Keisuke Ishibashi; Noriaki Kamiyama; Takeo Abe

  Proceedings of the Global Telecommunications Conference, 2006. GLOBECOM '06, San Francisco, CA, USA, 27 November - 1 December 2006 IEEE 2006 [Refereed]
  
• Detection of TCP performance degradation using link utilization statistics

  K Ishibashi; R Kawahara; T Asaka; M Aida; S Ono; S Asano

  IEICE TRANSACTIONS ON COMMUNICATIONS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E89B (1) 47 - 56 0916-8516 2006/01 [Refereed]
  
• Method of bandwidth dimensioning and management for aggregated TCP flows with heterogeneous access links

  R Kawahara; K Ishibashi; T Mori; T Ozawa; T Abe

  IEICE TRANSACTIONS ON COMMUNICATIONS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E88B (12) 4605 - 4615 0916-8516 2005/12 [Refereed]
  
• A method of bandwidth dimensioning and management using flow statistics

  R Kawahara; K Ishibashi; T Asaka; S Sumita; T Abe

  IEICE TRANSACTIONS ON COMMUNICATIONS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E88B (2) 643 - 653 0916-8516 2005/02 [Refereed]
  
• A method of detecting performance degradation at TCP flow level from sampled packet streams

  R Kawahara; K Ishibashi; T Mori; T Abe

  2005 Workshop on High Performance Switching and Routing IEEE 157 - 161 2005 [Refereed]
  
• On the characteristics of Internet traffic variability: Spikes and elephants

  T Mori; R Kawahara; S Naito; S Goto

  IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG E87D (12) 2644 - 2653 1745-1361 2004/12 [Refereed]
  
• An Adaptive Load Balancing Method for Multiple Paths Using Flow Statistics and Its Performance Analysis

  KAWAHARA Ryoichi

  IEICE Trans. Commun., B The Institute of Electronics, Information and Communication Engineers 87 (7) 1993 - 2003 0916-8516 2004/07 [Refereed]
  
• A method of bandwidth dimensioning and management for aggregated TCP flows with heterogeneous access links

  Ryoichi Kawahara; Keisuke Ishibashi; Tatsuya Mori; Toshihisa Ozawa; Shuichi Sumita; Takeo Abe

  Networks 2004 - 11th International Telecommunications Network Strategy and Planning Symposium 15 - 20 2004 [Refereed]
  
• On the characteristics of Internet traffic variability: Spikes and elephants

  T Mori; R Kawahara; S Naito; S Goto

  2004 INTERNATIONAL SYMPOSIUM ON APPLICATIONS AND THE INTERNET, PROCEEDINGS IEEE COMPUTER SOC 99 - 106 2004 [Refereed]
  
• Identifying elephant flows through periodically sampled packets.

  Tatsuya Mori; Masato Uchida; Ryoichi Kawahara; Jianping P; Shigeki Goto

  Proceedings of the 4th ACM SIGCOMM Internet Measurement Conference, IMC 2004, Taormina, Sicily, Italy, October 25-27, 2004 ACM 115 - 120 2004 [Refereed]
  
• Detection of TCP performance degradation using link utilization statistics

  K Ishibashi; R Kawahara; A Takuya; A Masaki

  GLOBECOM '04: IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE, VOLS 1-6 IEEE 845 - 850 2004 [Refereed]
  
• A method of bandwidth dimensioning and management using flow statistics [IP networks].

  Ryoichi Kawahara; Keisuke Ishibashi; Takuya Asaka; Shuichi Sumita; Takeo Abe

  Proceedings of the Global Telecommunications Conference, 2004. GLOBECOM '04, Dallas, Texas, USA, 29 November - 3 December 2004 IEEE 670 - 674 2004 [Refereed]
  
• A Method of IP Traffic Management Using the Relationship between TCP Flow Behavior and Link Utilization

  KAWAHARA Ryoichi; ISHIBASHI Keisuke; ASAKA Takuya; ORI Katsunori

  IEICE Trans. Commun., B The Institute of Electronics, Information and Communication Engineers 86 (11) 3244 - 3256 0916-8516 2003/11 [Refereed]
  
• A method of IP traffic management using TCP flow statistics

  R Kawahara; K Ishibashi; T Asaka; K Ori

  GLOBECOM'03: IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE, VOLS 1-7 IEEE 4059 - 4063 1930-529X 2003 [Refereed]
  
• Dynamically weighted queueing for fair bandwidth allocation and its performance analysis

  R Kawahara; N Komatsu

  2002 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, VOLS 1-5, CONFERENCE PROCEEDINGS IEEE 2379 - 2383 2002 [Refereed]
  
• Evaluation of congestion control of the PDC mobile packet data communication system

  K Yoshihara; T Suzuki; A Miura; R Kawahara

  GLOBECOM'02: IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE, VOLS 1-3, CONFERENCE RECORDS IEEE 1965 - 1969 2002 [Refereed]
  
• A Scalable IP Traffic Control Method for Weighted Bandwidth Allocation per Flow

  KAWAHARA Ryoichi; KOMATSU Naohisa

  IEICE Trans. Commun. The Institute of Electronics, Information and Communication Engineers 84 (10) 2815 - 2829 0916-8516 2001/10 [Refereed]
  
• Traffic measurement and analysis in an ATM-based internet backbone

  R Kawahara; K Ishibashi; T Hirano; H Saito; H Ohara; D Satoh; S Asano; J Matsukata

  COMPUTER COMMUNICATIONS ELSEVIER SCIENCE BV 24 (15-16) 1508 - 1524 0140-3664 2001/10 [Refereed]
  
• Network Engineering Based on Real-time Traffic Monitoring for an Internet Backbone

  S. ASANO; J. MATSUKATA; S. SAITO; R. KAWAHARA; S. URUSHIDANI

  Proceedings of International Switching Symposium (ISS'2000, Birmingham), (May 2000) (39784) 122.1 - 122.7 2000/05 [Refereed]
  
• Performance of TCP/IP over ATM over an ADSL

  KAWAHARA Ryoichi; SAITO Hiroshi

  IEICE Trans. Commun., B The Institute of Electronics, Information and Communication Engineers 83 (2) 140 - 154 0916-8516 2000/02 [Refereed]
  
• Metohd of Implementing GFR Service in Large-Scale Networks Using ABR Control Mechanism and Its Performance Analysis

  KAWAHARA Ryoichi; KAMADO Yuki; OMOTANI Masaaki; NAGATA Shunsaku

  IEICE Trans. Commun. The Institute of Electronics, Information and Communication Engineers 82 (12) 2081 - 2094 0916-8516 1999/12 [Refereed]
  
• ATM Traffic Control for Guaranteed IP Throughput Using ABR Weighted Bandwidth Allocation

  KAWAHARA Ryoichi; OZAWA Toshihisa

  The Transactions of the Institute of Electronics,Information and Communication Engineers B The Institute of Electronics, Information and Communication Engineers 82 (5) 908 - 919 1344-4697 1999/05 [Refereed]
  
• Performance Analysis of ATM Traffic Control Mechanisms for Guaranteed Througput Service

  ASAKA Takuya; KAWAHARA Ryoichi; OZAWA Toshihisa

  The Transactions of the Institute of Electronics,Information and Communication Engineers B-(0xF9C1) The Institute of Electronics, Information and Communication Engineers 81 (11) 731 - 740 0915-1877 1998/11 [Refereed]
  
• A Simple and Efficient ABR Control Algorithm in Large Scale Networks

  KAWAHARA Ryoichi; OZAWA Toshihisa

  The Transactions of the Institute of Electronics,Information and Communication Engineers B-(0xF9C1) The Institute of Electronics, Information and Communication Engineers 81 (11) 720 - 730 0915-1877 1998/11 [Refereed]
  
• Characteristics of ABR explicit rate control algorithms in WAN environments and an ABR control algorithm suitable for public networks

  R Kawahara; H Saito; M Kawarasaki

  INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS WILEY-BLACKWELL 11 (3) 189 - 209 1074-5351 1998/05 [Refereed]
  
• Characteristics of ABR explicit rate control algorithms in WAN environment

  R Kawahara; A Koike; M Ishizuka; M Koshiishi; M Kawarasaki

  ICC'97: 1997 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS - TOWARDS THE KNOWLEDGE MILLENNIUM, CONFERENCE RECORD - VOLS 1-3 IEEE 1396 - 1400 1997 [Refereed]
  
• Overload control for intelligent networks based on an estimation of maximum number of calls in a node

  R Kawahara; T Asaka

  INTELLIGENT NETWORK '96, WORKSHOP RECORD, VOLS 1 AND 2 IEEE 71 - 82 1996 [Refereed]
  
• Overload Control for the Intelligent Network and Its Analysis by Simulation

  KAWAHARA Ryoichi; ASAKA Takuya; SUMITA Shuichi

  IEICE transactions on communications The Institute of Electronics, Information and Communication Engineers 78 (4) 494 - 503 0916-8516 1995/04 [Refereed]
  

MISC

• 環境負荷を考慮した仮想ネットワーク制御手法—Virtual Network Control Method Considering Environmental Load

  中村 亮太; 川原 亮一; 原田 薫明  電子情報通信学会誌 = The journal of the Institute of Electronics, Information and Communication Engineers  106-  (6)  490  -495  2023/06
• Creating new value by leveraging network-ai technology in service operations

  Keishiro Watanabe; Yasuhiro Ikeda; Yuusuke Nakano; Keisuke Ishibashi; Ryoichi Kawahara; Satoshi Suzuki  NTT Technical Review  16-  (6)  2018/06
• Classifying OSes on User Devices Using the Similarity of DNS Query Sets

  駒井 友香; 小林 正裕; 原田 薫明; 石橋 圭介; 川原 亮一; 森 達哉; 後藤 滋樹  電子情報通信学会技術研究報告 = IEICE technical report : 信学技報  117-  (460)  1  -4  2018/03
• オートエンコーダを用いた異常検知におけるモデル再学習手法—Retraining Anomaly Detection Model using Autoencoder—情報ネットワーク

  池田 泰弘; 石橋 圭介; 中野 雄介; 渡辺 敬志郎; 川原 亮一  電子情報通信学会技術研究報告 = IEICE technical report : 信学技報  117-  (397)  77  -82  2018/01
• Anomaly Detection and Interpretation using Multimodal Autoencoder and Sparse Optimization.

  Yasuhiro Ikeda; Keisuke Ishibashi; Yuusuke Nakano; Keishiro Watanabe; Ryoichi Kawahara  CoRR  abs/1812.07136-  2018
• System design for cooperative edge-cloud computing (モバイルネットワークとアプリケーション)

  新熊 亮一; 加藤 槙悟; 上林 将大; 池田 泰弘; 川原 亮一; 林 孝典  電子情報通信学会技術研究報告 = IEICE technical report : 信学技報  117-  (71)  29  -32  2017/06
• B-7-36 Network graph contraction method for evaluating disaster's impact on networks

  Kawahara Ryoichi; Saito Hiroshi  Proceedings of the IEICE General Conference  2016-  (2)  169  -169  2016/03
• ITSに向けた無線干渉評価モデルの検討

  木村達明; 本多泰理; 川原亮一; 斎藤洋  電子情報通信学会大会講演論文集(CD-ROM)  2016-  ROMBUNNO.B‐7‐51  2016/03
• B-7-56 Optimal cell planning technique based on homology under macroscopic diversity with sector antennas

  Ikeda Yasuhiro; Kawahara Ryoichi; Saito Hiroshi  Proceedings of the IEICE General Conference  2015-  (2)  206  -206  2015/02
• BS-3-2 Searching algorithm for name resolution based on set of attribute-value pairs of real-world information

  Kawahara Ryoichi; Saito Hiroshi  Proceedings of the Society Conference of IEICE  2014-  (2)  "S  -2"-"S-3"  2014/09
• B-7-25 Outline of Disaster Avoidance Control

  Saito Hiroshi; Kawahara Ryoichi  Proceedings of the Society Conference of IEICE  2014-  (2)  82  -82  2014/09
• B-7-74 A study on mobile QoS tomography using compressed sensing

  Kawahara Ryoichi; Saito Hiroshi; Tonomura Yoshihide  Proceedings of the IEICE General Conference  2014-  (2)  249  -249  2014/03
• B-7-73 Optimal cell planning technique with macroscopic diversity

  Ikeda Yasuhiro; Saito Hiroshi; Kawahara Ryoichi  Proceedings of the IEICE General Conference  2014-  (2)  248  -248  2014/03
• Name resolution using hierarchical structure of each attribute in real world information

  Kawahara Ryoichi; Saito Hiroshi  Proceedings of the Society Conference of IEICE  2013-  (2)  123  -123  2013/09
• Name resolution based on a set of attribute-value pairs in real world information

  KAWAHARA Ryoichi; SAITO Hiroshi  IEICE technical report. Information networks  113-  (36)  65  -70  2013/05
• B-7-53 Multiple naming using real world information and name resolution

  Kawahara Ryoichi; Saito Hiroshi  Proceedings of the IEICE General Conference  2013-  (2)  197  -197  2013/03
• Simulation Study of Traffic Reduction by Combining Content Files in Peer-assisted Content Delivery Networks

  MAKI Naoya; SHINKUMA Ryoichi; MORI Tatsuya; KAMIYAMA Noriaki; KAWAHARA Ryoichi; TAKAHASHI Tatsuro  Technical report of IEICE. CQ  112-  (218)  1  -6  2012/09
• Topic Extraction Method by Semi-Supervised Latent Dirichlet Allocation for Real-Time Recommendation

  IKEDA Yasuhiro; KAWAHARA Ryoichi; SAITO Hiroshi  電子情報通信学会技術研究報告. IBISML, 情報論的学習理論と機械学習 = IEICE technical report. IBISML, Information-based induction sciences and machine learning  112-  (83)  35  -40  2012/06
• Impact of Multicast Pre-distribution on Networks

  上山 憲昭; 横田 健治; 川原 亮一  映像情報メディア学会技術報告  35-  (34)  17  -22  2011/09
• Impact of Multicast Pre-distribution on Networks

  KAMIYAMA Noriaki; YOKOTA Kenji; KAWAHARA Ryoichi; MORI Tatsuya  IEICE technical report  111-  (202)  1  -6  2011/09
• Traffic Reduction by Content-oriented Incentive Mechanism in Peer-assisted Content Delivery Network

  MAKI Naoya; NISHIO Takayuki; SHINKUMA Ryoichi; MORI Tatsuya; KAMIYAMA Noriaki; KAWAHARA Ryoichi; TAKAHASHI Tatsuro  IEICE technical report  111-  (202)  13  -18  2011/09
• B-16-2 On Load Balancing Heavy-tailed Traffic

  ISHIBASHI Keisuke; TAKAHASHI Yosuke; KAWAHARA Ryoichi  Proceedings of the Society Conference of IEICE  2011-  (2)  395  -395  2011/08
• Traffic Localization by Incentive Content-Download Control in Peer-assisted Content Distribution

  MAKI Naoya; NISHIO Takayuki; SHINKUMA Ryoichi; MORI Tatsuya; KAMIYAMA Noriaki; KAWAHARA Ryoichi; TAKAHASHI Tatsuro  IEICE technical report  111-  (43)  29  -34  2011/05
• Performance Evaluation of Autonomic Load Balancing for Flow Measurement

  KAMIYAMA Noriaki; MORI Tatsuya; KAWAHARA Ryoichi  IEICE technical report  111-  (1)  5  -10  2011/04
• MapReduceシステムのネットワーク負荷分析

  森達哉; 木村達明; 池田泰弘; 上山憲昭; 川原亮一  オペレーションズ・リサーチ  56-  (6)  331  -338  2011/04
• B-11-15 Comparison of Profit Allocation for Coalitional VoD Service

  Kamiyama Noriaki; Kawahara Ryoichi; Hasegawa Haruhisa  Proceedings of the IEICE General Conference  2011-  (2)  444  -444  2011/02
• B-7-38 A method of identifying TCP performance degradation using flow information

  Kawahara Ryoichi; Mori Tatsuya; Kamiyama Noriaki; Ishibashi Keisuke  Proceedings of the IEICE General Conference  2011-  (2)  202  -202  2011/02
• B-7-65 Validation of Peer-assisted Content Distribution with Incentive Mechanism

  MAKI Naoya; NISHIO Takayuki; SHINKUMA Ryoichi; MORI Tatsuya; KAMIYAMA Noriaki; KAWAHARA Ryoichi; TAKAHASHI Tatsuro  Proceedings of the IEICE General Conference  2011-  (2)  229  -229  2011/02
• Autonomic Load Balancing for Flow Measurement

  KAMIYAMA Noriaki; MORI Tatsuya; KAWAHARA Ryoichi  IEICE technical report  110-  (448)  687  -692  2011/02
• Analyzing Correlation among TCP Quality Metrics on Measured Traffic Data

  池田泰弘; 上山憲昭; 川原亮一; 木村達明; 森達哉  電子情報通信学会技術研究報告  111-  (67(IN2011 18-28))  2011
• A method of estimating RTT using hash based sampling and bloom filter and its evaluation

  KAWAHARA Ryoichi; KAWAGUTI Ginga; MORI Tatsuya; KAMIYAMA Noriaki; ISHIBASHI Keisuke  IEICE technical report  110-  (341)  31  -36  2010/12
• Understanding the Characteristics of Network Workload for MapReduce

  MORI Tatsuya; KIMURA Tatsuaki; IKEDA Yasuhiro; KAMIYAMA Noriaki; KAWAHARA Ryoichi  IEICE technical report  110-  (287)  5  -10  2010/11
• Loss-Recovery Method on Content Pre-distribution in VoD Service

  KAMIYAMA Noriaki; YOKOTA Kenji; KAWAHARA Ryoichi; MORI Tatsuya  IEICE technical report  110-  (287)  11  -16  2010/11
• Analysis of impact of traffic on large-scale NAT

  KAWAHARA Ryoichi; YADA Takeshi; MORI Tatsuya  IEICE technical report  110-  (224)  75  -80  2010/10
• Effect of temporal monitoring granularity on detection accuracy of anomalous traffic

  keisuke ISHIBASHI; Ryoichi KAWAHARA; Tatsuya MORI; Tsuyoshi KONDOH; Ahoichiro ASANO  Technical Report of IEICE  IA-  (110)  43  -48  2010/10
• B-7-17 A method of estimating RTT using bloom filter and packet sampling

  Kawahara Ryoichi; Kawaguti Ginga; Mori Tatsuya; Kamiyama Noriaki; Ishibashi Keisuke  Proceedings of the Society Conference of IEICE  2010-  (2)  94  -94  2010/08
• B-11-12 Effect of Limiting Pre-distribution Content in VoD Services

  Kamiyama Noriaki; Kawahara Ryoichi; Mori Tatsuya; Hasegawa Haruhisa  Proceedings of the Society Conference of IEICE  2010-  (2)  279  -279  2010/08
• R&Dホットコーナー ソリューション オーバレイネットワークによるトラフィック可制御化技術

  川原 亮一; 上山 憲昭; 森 達哉  NTT技術ジャ-ナル  22-  (6)  32  -35  2010/06
• Applications of IP Flow Measurement Technologies

  KAWAHARA Ryoichi; MORI Tatsuya; KAMIYAMA Noriaki  The Journal of the Institute of Electronics, Information and Communication Engineers  93-  (4)  287  -292  2010/04
• B-7-74 Concise methodology for monitoring packet transfer delay in wide area network

  Kawaguti Ginga; Kawahara Ryoichi  Proceedings of the IEICE General Conference  2010-  (2)  225  -225  2010/03
• BS-3-15 Controlling Overlays with Overlay : Traffic Engineering through Cooperation between Overlay and Underlay

  Kawahara Ryoichi; Harada Shigeaki; Kamiyama Noriaki; Mori Tatsuya; Hasegawa Haruhisa; Nakao Akihiro  Proceedings of the IEICE General Conference  2010-  (2)  "S  -52"-"S-53"  2010/03
• B-6-100 Performance Comparison of Load Reduction Methods in VoD Services

  Kamiyama Noriaki; Kawahara Ryouichi; Mori Tatsuya; Hasegawa Haruhisa  Proceedings of the IEICE General Conference  2010-  (2)  100  -100  2010/03
• Effect of Limiting Pre-distribution Content and User Clustering on Content Pre-distribution

  KAMIYAMA Noriaki; KAWAHARA Ryoichi; MORI Tatsuya; HASEGAWA Haruhisa  IEICE technical report  109-  (448)  171  -176  2010/02
• Comparison of Profit Allocation for Coalitional VoD Service of ISPs

  KAMIYAMA Noriaki; KAWAHARA Ryoichi; HASEGAWA Haruhisa  IEICE technical report  109-  (411)  5  -10  2010/01
• Concise methodology for monitoring packet transfer delay in wide area network

  KAWAGUTI Ginga; KAWAHARA Ryoichi  IEICE technical report  109-  (411)  29  -32  2010/01
• Broadcast Pre-distribution in VoD Services

  KAMIYAMA Noriaki; KAWAHARA Ryoichi; MORI Tatsuya; HASEGAWA Haruhisa  IEICE technical report  109-  (398)  83  -88  2010/01
• Characterizing workload of large-scale video sharing services

  MORI Tatsuya; KAWAHARA Ryoichi; HASEGAWA Haruhisa; SHIMOGAWA Shinsuke  IEICE technical report  109-  (273)  33  -38  2009/11
• 1-B-2 提携形ゲームを用いたVoDサービスにおけるISP連携の検討(ゲーム理論(1))

  上山 憲昭; 川原 亮一; 長谷川 治久  日本オペレーションズ・リサーチ学会秋季研究発表会アブストラクト集  2009-  30  -31  2009/09
• Coalition of ISPs in VoD Service Using Coalitional Game

  KAMIYAMA Noriaki; KAWAHARA Ryoichi; HASEGAWA Haruhisa  IEICE technical report  109-  (189)  47  -52  2009/09
• B-7-11 A method of estimating QoS using flow sampling

  Kawahara Ryoichi; Ishibashi Keisuke; Mori Tatsuya; Kamiyama Noriaki; Hasegawa Haruhisa  Proceedings of the Society Conference of IEICE  2009-  (2)  79  -79  2009/09
• BS-5-5 Performance evaluation of peer assisted data dissemination

  Kawahara Ryoichi; Kamiyama Noriaki; Mori Tatsuya; Hasegawa Haruhisa  Proceedings of the Society Conference of IEICE  2009-  (2)  "S  -17"-"S-18"  2009/09
• BS-5-6 Toward scalable byte caching on high-speed core routers

  Mori Tatsuya; Nakao Akihiro; Kamiyama Noriaki; Hasegawa Haruhisa; Kawahara Ryoichi  Proceedings of the Society Conference of IEICE  2009-  (2)  "S  -19"-"S-20"  2009/09
• B-7-46 An evaluation of the buffer exhaustion condition in the TCP video delivery service

  Takeshita Kei; Kurosawa Takeshi; Kawahara Ryoichi; Tsujino Masayuki; Iwashita Motoi  Proceedings of the Society Conference of IEICE  2009-  (2)  114  -114  2009/09
• Analyzing Impact of Topology on Effect of Parallel Video Streaming

  KAMIYAMA Noriaki; KAWAHARA Ryoichi; MORI Tatsuya; HARADA Shigeaki; HASEGAWA Haruhisa  IEICE technical report  109-  (129)  79  -84  2009/07
• Analysis of Topological Impact on Caches for Reducing P2P Traffic

  KAMIYAMA Noriaki; KAWAHARA Ryoichi; MORI Tatsuya; HARADA Shigeaki; HASEGAWA Haruhisa  IEICE technical report  109-  (102)  1  -6  2009/06
• Parallel Video Streaming Maximizing Maximum Network Throughput

  KAMIYAMA Noriaki; KAWAHARA Ryoichi; MORI Tatsuya; HARADA Shigeaki; HASEGAWA Haruhisa  IEICE technical report  109-  (36)  7  -12  2009/05
• BS-4-14 How Incentive Helps in Making Peer-assisted CDN Deployable?(BS-4. System, control and design technologies for emerging network)

  Mori Tatsuya; Kamiyama Noriaki; Harada Shigeaki; Hasegawa Haruhisa; Kawahara Ryoichi  Proceedings of the IEICE General Conference  2009-  (2)  "S  -27"-"S-28"  2009/03
• B-7-43 On traffic optimization through cooperation of overlay and underlay networks

  Kawahara Ryoichi; Kamiyama Noriaki; Mori Tatsuya; Harada Shigeaki; Hasegawa Haruhisa; Nakao Akihiro  Proceedings of the IEICE General Conference  2009-  (2)  187  -187  2009/03
• B-7-120 Optimum Cache Design for Reducing P2P Traffic

  Kamiyama Noriaki; Kawahara Ryoichi; Mori Tatsuya; Harada Shigeaki; Hasegawa Haruhisa  Proceedings of the IEICE General Conference  2009-  (2)  264  -264  2009/03
• B-7-44 オーバレイネットワークにおける経路選択方法の検討(B-7.情報ネットワーク,一般セッション)

  原田 薫明; 川原 亮一; 森 達哉; 上山 憲昭; 長谷川 治久  電子情報通信学会総合大会講演論文集  2009-  (2)  188  -188  2009/03
• Analysis of Relation between Volume and Periodic Pharacteristics in the Internet Traffic

  HARADA Shigeaki; KAWAHARA Ryoichi; MORI Tatsuya; KAMIYAMA Noriaki; HASEGAWA Haruhisa; TOKUHISA Masaki  IEICE technical report  108-  (458)  213  -218  2009/02
• Optimum Cache Design for Reducing P2P Traffic

  KAMIYAMA Noriaki; KAWAHARA Ryoichi; MORI Tatsuya; HARADA Shigeaki; HASEGAWA Haruhisa  IEICE technical report  108-  (457)  129  -134  2009/02
• P2P CDN Architecture Based on Explicit Incentive to End-Users

  MORI Tatsuya; KAMIYAMA Noriaki; HARADA Shigeaki; HASEGAWA Haruhisa; KAWAHARA Ryoichi  IEICE technical report  108-  (286)  81  -86  2008/11
• Performance Evaluation of ISP-Operated CDN

  KAMIYAMA Noriaki; MORI Tatsuya; KAWAHARA Ryoichi; HASEGAWA Haruhisa  IEICE technical report  108-  (258)  43  -48  2008/10
• Detection technologies of microscopic traffic anomalies: inspired from large communication graph

  ISHIBASHI Keisuke; KAWAHARA Ryoichi  The Journal of the Institute of Electronics, Information and Communication Engineers  91-  (10)  886  -890  2008/10
• Distributed Measurement for Overlay Network Infrastructure

  KAMEI Satoshi; KAWAHARA Ryoichi  IEICE technical report  108-  (223)  61  -66  2008/09
• BS-12-37 Identifying anomalous traffic sources using flow statistics(BS-12. Network Planning, Control, and Management)

  Kawahara Ryoichi; Kamiyama Noriaki; Harada Shigeaki; Hasegawa Haruhisa; Asano Shoichiro  Proceedings of the Society Conference of IEICE  2008-  (2)  "S  -187"-"S-188"  2008/09
• B-7-18 A Method of Constructing QoS Overlay Network and Its Evaluation

  Kawahara Ryoichi; Kamei Satoshi; Kamiyama Noriaki; Hasegawa Haruhisa; Nakao Akihiro  Proceedings of the Society Conference of IEICE  2008-  (2)  72  -72  2008/09
• BS-6-3 Evaluation for Detectability of Identifying Anomalous Traffic Using Delta Traffic

  Harada Shigeaki; Kawahara Ryoichi; Kamiyama Noriaki; Kondoh Tsuyoshi; Ishibashi Keisuke; Asano Shoichiro  Proceedings of the Society Conference of IEICE  2008-  (2)  "S  -47"-"S-48"  2008/09
• Evaluation of Intra-Access-Network Traffic Engineering for Peer-to-Peer Applications

  KAMEI Satoshi; KAWAHARA Ryoichi; HASEGAWA Haruhisa; YOSHINO Hideaki; MIYAKE Kou  IEICE technical report  108-  (134)  43  -48  2008/07
• Analysis of Efficient Network Structure for Parallel Download

  KAMIYAMA Noriaki; KAWAHARA Ryoichi; HASEGAWA Haruhisa  IEICE technical report  108-  (31)  19  -24  2008/05
• Evaluation for Detectability of Identifying Anomalous Traffic Using Delta Traffic

  HARADA Shigeaki; KAWAHARA Ryoichi; KAMIYAMA Noriaki; KONDOH Tsuyoshi; ISHIBASHI Keisuke; ASANO Shoichiro  IEICE technical report  108-  (31)  1  -6  2008/05
• 差分トラヒック量を利用した異常ボリューム変化特定手法の精度評価（共著）

  原田薫明; 川原亮一; 上山憲昭; 近藤 毅; 石橋圭介; 浅野正一郎  NS研究会  2008/05
• B-7-9 Path identification using elephant flows

  ISHIBASHI Keisuke; KOBAYASHI Atsushi; MORI Tatsuya; KAWAHARA Ryoichi; KONDOH Tsuyoshi  Proceedings of the IEICE General Conference  2008-  (2)  86  -86  2008/03
• BS-5-3 Optimum Parameter Setting in Identifying and Quarantining Worm-Infected Hosts

  Kamiyama Noriaki; Mori Tatsuya; Kawahara Ryoichi; Harada Shigeaki  Proceedings of the IEICE General Conference  2008-  (2)  "S  -62"-"S-63"  2008/03
• B-7-10 A Study of Anomaly Detectability by Partitioning Method

  Harada Shigeaki; Kawahara Ryoichi; Kamiyama Noriaki; Asano Shoichiro  Proceedings of the IEICE General Conference  2008-  (2)  87  -87  2008/03
• B-7-11 Mean-variance characteristic of spatially partitioned traffic and its applications to estimation of traffic variations

  Kawahara Ryoichi; Ishibashi Keisuke; Mori Tatsuya; Kamiyama Noriaki; Harada Shigeaki; Asano Shoichiro  Proceedings of the IEICE General Conference  2008-  (2)  88  -88  2008/03
• 異常トラヒック測定分析手法 (特集 広域異常トラヒック検知・制御システムの研究開発)

  川原 亮一; 森 達哉; 原田 薫明  NTT技術ジャ-ナル  20-  (3)  21  -25  2008/03
• A proposal of file sharing method in P2P network considering the backlog of file transfer time

  OHNUMA Tomohiro; KAWAHARA Ryoichi; KAWARASAKI Masatoshi  IEICE technical report  107-  (483)  81  -86  2008/02
• インターネットトラヒック測定分析手法と異常トラヒック検出法

  川原亮一; 原田 薫明; 森 達哉; 上山 憲昭  日本OR学会第59回シンポジウム「インターネットとOR」, 2008. 3  31  -45  2008
• Impact of unreliable link metric on traffic routing performance

  KODAMA Mizuho; KAMEI Satoshi; HASEGAWA Go; KAWAHARA Ryoichi; MURATA Masayuki; YOSHINO Hideaki  IEICE technical report  107-  (312)  25  -30  2007/11
• Performance analysis of QoS overlay routing and its adaptation to various QoS metrics

  KAWAHARA Ryoichi; LUA Eng KEONG; UCHIDA Masato; KAMEI Satoshi; YOSHINO Hideaki  IEICE technical report  107-  (222)  7  -12  2007/09
• A method of detecting network anomalies for periodic traffic

  HARADA Shigeaki; KAWAHARA Ryoichi; MORI Tatsuya; KAMIYAMA Noriaki; YOSHINO Hideaki  IEICE technical report  107-  (222)  93  -98  2007/09
• B-7-13 Performance evaluation of overlay routing handling multiple QoS metrics

  Kawahara Ryoichi; Kamei Satoshi; Lua Eng Keong; Uchida Masato; Yoshino Hideaki  Proceedings of the Society Conference of IEICE  2007-  (2)  73  -73  2007/08
• B-7-34 Network Design with Application Layer Traffic Shift

  KAMEI Satoshi; KAWAHARA Ryoichi  Proceedings of the Society Conference of IEICE  2007-  (2)  94  -94  2007/08
• Optimum Parameter Setting in Identifying and Quarantining Worm-Infected Hosts

  KAMIYAMA Noriaki; MORI Tatsuya; KAWAHARA Ryoichi; HARADA Shigeaki  IEICE technical report  107-  (148)  13  -18  2007/07
• Identifying Worm-Infected Hosts Using White List

  KAMIYAMA Noriaki; MORI Tatsuya; KAWAHARA Ryoichi; HARADA Shigeaki; YOSHINO Hideaki  IEICE technical report  107-  (98)  79  -84  2007/06
• B-7-20 Autonomic Clustering Method for IP QOS Measurement on Distributed Environment

  KAMEI Satoshi; KAWAHARA Ryoichi  Proceedings of the IEICE General Conference  2007-  (2)  110  -110  2007/03
• B-7-72 Detection accuracy of network anomaly detection using sampled flow statistics

  Kawahara Ryoichi; Ishibashi Keisuke; Mori Tatsuya; Kamiyama Noriaki; Harada Shigeaki; Asano Shoichiro  Proceedings of the IEICE General Conference  2007-  (2)  162  -162  2007/03
• B-7-73 Detection accuracy of network anomaly detection using sampled packet statistics

  ISHIBASHI Keisuke; KAWAHARA Ryoichi; MORI Tatsuya; KONDO Tsuyoshi; ASANO Shoichiro  Proceedings of the IEICE General Conference  2007-  (2)  163  -163  2007/03
• Traffic Leap Detection for Internet Backbone

  HIROKAWA Yutaka; YAMAMOTO Kimihiro; HARADA Shigeaki; KAWAHARA Ryoichi  IEICE technical report  106-  (577)  403  -408  2007/03
• Effect of sampling rate and monitoring granularity on anomaly detectability

  ISHIBASHI Keisuke; KAWAHARA Ryoichi; MORI Tatsuya; KONDOH TSUYOSHI; ASANO Shoichiro  IEICE technical report  106-  (578)  125  -130  2007/03
• Detection accuracy of network anomaly detection using sampled flow statistics

  KAWAHARA Ryoichi; ISHIBASHI Keisuke; MORI Tatsuya; KAMIYAMA Noriaki; HARADA Shigeaki; ASANO Shoichiro  IEICE technical report  106-  (578)  131  -136  2007/03
• B-7-116 A method of detecting network anomalies and determining their termination

  Harada Shigeaki; Kawahara Ryoichi; Mori Tatsuya; Kamiyama Noriaki; Hirokawa Yutaka; Yamamoto Kimihiro  Proceedings of the IEICE General Conference  206  -206  2007
• BS-8-5 A method of detecting network anomalies for periodic traffic

  Harada Shigeaki; Kawahara Ryoichi; Mori Tatsuya; Kamiyama Noriaki; Yoshino Hideaki  Proceedings of the Society Conference of IEICE  "S  -86"-"S-87"  2007
• A method of detecting network anomalies and determining their termination

  HARADA Shigeaki; KAWAHARA Ryoichi; MORI Tatsuya; KAMIYAMA Noriaki; HIROKAWA Yutaka; YAMAMOTO Kimihiro  IEICE technical report  106-  (420)  115  -120  2006/12
• サンプルフロー情報を用いた異常トラヒック検出法に関する一考察 （共著）

  川原亮一; 森 達哉; 石橋圭介; 上山憲昭; 原田薫明; 浅野正一郎  CQ研究会  2006/11
• A study on detecting network anomalies using sampled flow statistics

  KAWAHARA Ryoichi; MORI Tatsuya; ISHIBASHI Keisuke; KAMIYAMA Noriaki; HARADA Shigeaki; ASANO Shoichiro  IEICE technical report  106-  (355)  7  -12  2006/10
• A study on detecting network anomalies using sampled flow statistics

  KAWAHARA R.; MORI Tatsuya; ISHIBASHI Keisuke; KAMIYAMA Noriaki; HARADA Shigeaki; ASANO Shoichiro  IEICE technical report  106-  (356)  37  -42  2006/10
• Evaluation of QoS overlay routing algorithm to cope with changes in traffic patterns

  KAWAHARA Ryoichi; UCHIDA Masato; KAMEI Satoshi  IEICE technical report  106-  (237)  37  -42  2006/09
• Performance Evaluation of Flow Hog Identification Method

  KAMIYAMA Noriaki; MORI Tatsuya; KAWAHARA Ryoichi  IEICE technical report  106-  (237)  97  -102  2006/09
• B-7-55 Identifying Variable-Rate Large-Size Flows by Packet Sampling

  Kamiyama Noriaki; Mori Tatsuya; Kawahara Ryoichi  Proceedings of the Society Conference of IEICE  2006-  (2)  115  -115  2006/09
• NetDelta : Method for detailed, long-term analysis of massive amount of traffic data

  MORI Tatsuya; ISHIBASHI Keisuke; KAMIYAMA Noriaki; KAWAHARA Ryoichi; ASANO Shoichiro  IEICE technical report  106-  (236)  133  -138  2006/09
• Optimum Memory Allocation in Identifying Flow Hogs

  KAMIYAMA Noriaki; MORI Tatsuya; KAWAHARA Ryoichi  IEICE technical report  106-  (167)  97  -100  2006/07
• Evaluation of Feasible Network Topology in Large Scale Network for Peer-to-Peer Traffic Growth

  KAMEI Satoshi; KAWAHARA Ryoichi  IEICE technical report  106-  (153)  11  -15  2006/07
• Estimating Top-N Hosts in Cardinality and Its Application to Anomaly Detection

  ISHIBASHI Keisuke; MORI Tatsuya; KAWAHARA Ryoichi; HIROKAWA Yutaka; KOBAYASHI Atsushi; YAMAMOTO Kimihiro; SAKAMOTO Hitoaki  IEICE technical report  106-  (14)  53  -56  2006/04
• QoS control to handle long-duration large flows and its performance evaluation

  KAWAHARA Ryoichi; MORI Tatsuya; ABE Takeo  IEICE technical report  106-  (9)  69  -74  2006/04
• B-7-132 QoS overlay routing algorithm with limited number of alternative route candidates

  Kawahara Ryoichi; Kamei Satoshi; Uchida Masato; Abe Takeo  Proceedings of the IEICE General Conference  2006-  (2)  228  -228  2006/03
• Clustering Method of IP QoS Measurement for Large Network and its Evaluation with Simulation

  KAMEI Satoshi; KAWAHARA Ryoichi  IEICE technical report  105-  (628)  237  -241  2006/03
• QoS overlay routing algorithm with limited number of alternative route candidates and its evaluation

  KAWAHARA Ryoichi; KAMEI Satoshi; UCHIDA Masato; ABE Takeo  IEICE technical report  105-  (628)  231  -236  2006/03
• NetHost : Aggregation of Traffic Summary Per-Host

  MORI Tatsuya; ISHIBASHI Keisuke; KAMIYAMA Noriaki; KAWAHARA Ryoichi  IEICE technical report  105-  (627)  5  -8  2006/03
• Identification of Flow Hogs by Flow Sampling

  KAMIYAMA Noriaki; MORI Tatsuya; KAWAHARA Ryoichi  IEICE technical report  105-  (628)  165  -170  2006/03
• BS-5-1 Estimating Top-N Hosts in Cardinality and its Application to Anomaly Detection

  ISHIBASHI Keisuke; MORI Tatsuya; KAWAHARA Ryoichi; HIROKAWA Yutaka; KOBAYASHI Atsushi; Yamamoto Kimihiro; SAKAMOTO Hitoaki  Proceedings of the IEICE General Conference  "S  -35"-"S-36"  2006
• Simple timeout mechanism in traffic measurement

  KAMIYAMA Noriaki; MORI Tatsuya; KAWAHARA Ryoichi  IEICE technical report  105-  (472)  97  -102  2005/12
• Clustering Method for IP QoS Measurement on Distributed Environment

  KAMEI Satoshi; KAWAHARA Ryoichi  IEICE technical report  105-  (405)  25  -29  2005/11
• Detection of Worm-Infected Hosts by Communication Pattern Analysis

  MORI Tatsuya; KAWAHARA Ryoichi; KAMIYAMA Noriaki; ISHIBASHI Keisuke; ABE Takeo  IEICE technical report  105-  (405)  13  -18  2005/11
• Detection of Worm-Infected Hosts by Communication Pattern Analysis

  MORI Tatsuya; KAWAHARA Ryoichi; KAMIYAMA Noriaki; ISHIBASHI Keisuke; ABE Takeo  IEICE technical report  105-  (406)  1  -6  2005/11
• Estimating flow rate from sampled packet streams for detection of performance degradation at TCP flow level

  KAWAHARA Ryoichi; MORI Tatsuya; ISHIBASHI Keisuke; KAMIYAMA Noriaki; ABE Takeo  IEICE technical report  105-  (406)  7  -12  2005/11
• Estimating flow rate from sampled packet streams for detection of performance degradation at TCP flow level

  KAWAHARA Ryoichi; MORI Tatsuya; ISHIBASHI Keisuke; KAMIYAMA Noriaki; ABE Takeo  IEICE technical report  105-  (405)  19  -24  2005/11
• Applying Naive Bayesian Classifier to Network Management

  MORI Tatsuya; KAWAHARA Ryoichi; KAMIYAMA Noriaki  IEICE technical report  105-  (357)  17  -20  2005/10
• B-7-64 Evaluation on Scalability of Overlay Routing

  Uchida Masato; Kamei Satoshi; Kawahara Ryoichi  Proceedings of the Society Conference of IEICE  2005-  (2)  191  -191  2005/09
• BS-9-2 Performance evaluation of QoS control to handle long-duration large flows(BS-9. Latest Trends on Information Networking Technologies)

  Kawahara Ryoichi; Kaneko Hidefumi; Mori Tatsuya; Abe Takeo  Proceedings of the Society Conference of IEICE  2005-  (2)  "SE  -3"-"SE-4"  2005/09
• B-7-10 Clustering Method for IP QoS Measurement on Distributed Environment

  KAMEI Satoshi; UCHIDA Masato; KAWAHARA Ryoichi  Proceedings of the Society Conference of IEICE  2005-  (2)  137  -137  2005/09
• B-7-32 Analysis of impact of link congestion in reverse direction on TCP performance

  Kawahara Ryoichi; Mori Tatsuya; Ishibashi Keisuke; Abe Takeo  Proceedings of the Society Conference of IEICE  2005-  (2)  159  -159  2005/09
• Application of Peer-to-Peer Technologies to Overlay Routing Infrastructure

  KAMEI Satoshi; UCHIDA Masato; KAWAHARA Ryoichi; ABE Takeo  IEICE technical report. Information networks  105-  (178)  55  -60  2005/07
• Evaluation of QoS-aware Routing in Overlay Network

  UCHIDA Masato; KAMEI Satoshi; KAWAHARA Ryoichi  IEICE technical report. Information networks  105-  (178)  13  -18  2005/07
• Classifying Flow Characteristics using Naive Bayesian Classifier

  MORI Tatsuya; KAWAHARA Ryoichi; KAMIYAMA Noriaki  IEICE technical report  105-  (12)  9  -12  2005/04
• A method of estimating TCP flow statistics through packet sampling and its evaluation

  KAWAHARA Ryoichi; MORI Tatsuya; ISHIBASHI Keisuke; KAMIYAMA Noriaki; ABE Takeo  Technical report of IEICE. TM  104-  (706)  19  -24  2005/03
• 超高速ネットワークにおけるトラヒック測定分析技術

  川原 亮一; 森 達哉; 石橋 圭介; 阿部 威郎  オペレーションズ・リサーチ : 経営の科学 = [O]perations research as a management science [r]esearch  50-  (3)  163  -168  2005/03
• B-7-26 Analyzing Flow Characteristics for Building Scalable Flow Management Scheam

  Mori Tatsuya; Kawahara Ryoichi; Kamiyama Noriaki; Ishibashi Keisuke; Abe Takeo  Proceedings of the IEICE General Conference  180  -180  2005
• B-7-46 Evaluation of Path Selection for Overly QoS Control

  Uchida Masato; Kamei Satoshi; Kawahara Ryoichi; Abe Takeo  Proceedings of the IEICE General Conference  200  -200  2005
• B-7-4 Classification of Internet hosts based on communication pattern

  Mori Tatsuya; Kawahara Ryoichi; Kamiyama Noriaki  Proceedings of the Society Conference of IEICE  131  -131  2005
• B-7-2 A method of estimating TCP flow statistics through SYN packet sampling

  Kawahara Ryoichi; Mori Tatsuya; Kamiyama Noriaki; Abe Takeo  Proceedings of the IEICE General Conference  156  -156  2005
• 超高速ネットワークにおけるトラヒック測定分析技術(企業事例交流会(2))

  川原 亮一; 森 達哉; 阿部 威郎  日本オペレーションズ・リサーチ学会秋季研究発表会アブストラクト集  2004-  22  -23  2004/09
• Internet Traffic Engineering using End-host-based Overlay Network and Its Effectiveness

  KAMEI Satoshi; KAWAHARA Ryoichi  IEICE technical report. Information networks  104-  (182)  1  -5  2004/07
• A New Traffic Control Paradigm using Overlay Networks

  KIMURA Takumi; UCHIDA Masato; KAWAHARA Ryoichi; KAMEI Satoshi; MORI Tatsuya; NOGAMI Shinya; ABE Takeo  IEICE technical report. Information networks  104-  (182)  7  -12  2004/07
• Identifying elephant flows from sampled packet stream

  MORI Tatsuya; UCHIDA Masato; KAWAHARA Ryoichi; GOTO Shigeki  IEICE technical report  104-  (18)  17  -20  2004/04
• A method of estimating TCP performance for aggregated flows with heterogeneous access links and its evaluation

  KAWAHARA Ryoichi; ISHIBASHI Keisuke; MORI Tatsuya; OZAWA Toshihisa; SUMITA Shuichi; ABE Takeo  IEICE technical report  104-  (18)  29  -32  2004/04
• A Study of IP Traffic Analyses

  OKADA Akihiro; KAWAHARA Ryoichi  IEICE technical report  104-  (17)  25  -28  2004/04
• B-7-102 A scalable QoS control to handle long-lived elephant flows

  Kawahara Ryoichi; Mori Tatsuya; Sumita Shuichi; Abe Takeo  Proceedings of the IEICE General Conference  2004-  (2)  311  -311  2004/03
• B-7-117 Identifying elephant flows using packet sampling

  Mori Tatsuya; Uchida Masato; Kawahara Ryoichi; Goto Shigeki  Proceedings of the IEICE General Conference  2004-  (2)  326  -326  2004/03
• B-7-121 An Approximation of TCP File-Transfer Time for Heterogeneous Access Links

  ISHIBASHI Keisuke; KAWAHARA Ryoichi; MORI Tatsuya; OZAWA Toshihisa; AIDA Masaki  Proceedings of the IEICE General Conference  2004-  (2)  330  -330  2004/03
• サンプルパケット情報を用いたTCPフローレベル性能劣化検出法

  川原亮一  信学技報  2004
• 異速度TCPフロー集約リンクにおけるTCP品質推定法と帯域設計管理法

  川原亮一; 石橋 圭介; 森 達哉; 小沢 利久; 住田 修一; 阿部 威郎  日本OR学会春季研究発表会, 2004  98  -99  2004
• Detecting Degradation of Performance at Flow Level Using Statistics of Utilization Ratio

  ISHIBASHI Keisuke; KAWAHARA Ryoichi; ASAKA Takuya; AIDA Masaki  Technical report of IEICE. CQ  103-  (445)  45  -48  2003/11
• A Study of IP Traffic Analyses

  OKADA Akihiro; KAWAHARA Ryoichi  IEICE technical report  103-  (386)  17  -20  2003/10
• A Method of Bandwidth Dimensioning and Management Using Flow Statistics

  KAWAHARA Ryoichi; ISHIBASHI Keisuke; ASAKA Takuya  IEICE technical report. Communication systems  103-  (313)  1  -4  2003/09
• Bandwidth Management Method Using Statistics of Utilization Ratio

  ISHIBAHI Keisuke; KAWAHARA Ryoichi; ASAKA Takuya; AIDA Masaki  IEICE technical report. Communication systems  103-  (313)  5  -8  2003/09
• Bandwidth Management Method Using Statistics of Utilization Ratio

  ISHIBASHI Keisuke; KAWAHARA Ryoichi; ASAKA Takuya; AIDA Masaki  Proceedings of the Society Conference of IEICE  2003-  (2)  188  -188  2003/09
• An Adaptive Load Balancing Method for Multiple Paths Using TCP Flow Statistics

  KAWAHARA Ryoichi  IEICE technical report  103-  (9)  13  -16  2003/04
• Load Balancing Algorithm for Multiple Paths Using Flow Statistics and Its Performance Analysis

  Kawahara Ryoichi  Proceedings of the IEICE General Conference  2003-  (2)  132  -132  2003/03
• On the relationship between the Pareto rule of flow rate distribution and network traffic variability

  Mori Tatsuya; Kawahara Ryoichi; Naito Shozo  Proceedings of the IEICE General Conference  2003-  (2)  "S  -3"-"S-4"  2003/03
• A Method of IP Traffic Management Using TCP Flow Statistics

  KAWAHARA Ryoichi; ISHIBASHI Keisuke; ASAKA Takuya; ORI Katsunori  IEICE technical report  102-  (458)  53  -56  2002/11
• Web Server Performance Modeling Method for Accurate Simulation of End User Response Time

  MINENO Hiroshi; KAWAHARA Ryoichi  情報処理学会研究報告システム評価（EVA）  2002-  (55)  37  -42  2002/06
• Analysis of network traffic focusing on per-time-block flow statistics

  MORI Tatsuya; KAWAHARA Ryoichi; NAITO Shozo  IEICE technical report. Information networks  101-  (716)  1  -8  2002/03
• Analysis of network traffic focusing on per-time-block flow statistics

  MORI Tatsuya; KAWAHARA Ryoichi; NAITO Shozo  IEICE technical report  101-  (714)  1  -8  2002/03
• A Study on the Difference in Marginal Distributions of Network Traffic

  MORI Tatsuya; KAWAHARA Ryoichi  IEICE technical report. Information networks  101-  (414)  1  -7  2001/11
• SB-10-2 Analysis of Relationship between TCP Flow Behavior and Utilization of Bottleneck Link

  Kawahara Ryoichi; Ishibashi Keisuke  Proceedings of the Society Conference of IEICE  2001-  (2)  19  -20  2001/08
• SB-10-3 Is the Hurst Parameter Sufficient for Evaluating the Performance of Bursty Network Traffic?

  Mori Tatsuya; Kawahara Ryoichi  Proceedings of the Society Conference of IEICE  2001-  (2)  21  -22  2001/08
• A Study Relationship between Number of Active Flows and TCP Performance

  Kawahara Ryoichi; Ishibashi Keisuke  Proceedings of the IEICE General Conference  2001-  (2)  324  -324  2001/03
• On Flow Characteristics Measured on a Bottleneck Link

  ISHIBASHI Keisuke; KAWAHARA Ryoichi; KOIKE Arata  Proceedings of the IEICE General Conference  2001-  (2)  701  -701  2001/03
• IP flow characteristics for WAN traffic

  ISHIBASHI Keisuke; KAWAHARA Ryoichi; KOIKE Arata  Technical report of IEICE. CQ  100-  (458)  1  -6  2000/11
• A Scalable IP Traffic Control Method for Weighted Bandwidth Allocation per Flow

  Kawahara Ryoichi; Komatsu Naohisa  Proceedings of the Society Conference of IEICE  2000-  (2)  77  -77  2000/09
• ATM Traffic Control Methods in TCP/IP over ATM over ADSL Communications

  KAWAHARA Ryoichi; SAITO Hiroshi  IEICE technical report. Information networks  100-  (105)  71  -78  2000/06
• Analyzing IP Flows based on Traffic Measurement

  Ishibashi Keisuke; Kawahara Ryoichi; Koike Arata; Nakagawa Shinichi  Proceedings of the Society Conference of IEICE  91  -91  2000
• A Method of Weighted Bandwidth Allocation to Each Flow in Diffserv Architecture

  KAWAHARA Ryoichi; Komatsu Naohisa  Proceedings of the IEICE General Conference  113  -113  2000
• A study on queuing method for real-time applications

  Hirano Toshiyuki; Kawahara Ryoichi  Proceedings of the IEICE General Conference  165  -165  2000
• A simple and efficient ABR control algorithm for large-scale networks

  R Kawahara; T Ozawa  ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS  83-  (9)  44  -56  2000
• Traffic Measurement and Analysis in Internet Backbone

  KAWAHARA Ryoichi; ISHIBASHI Keisuke; HIRANO Toshiyuki; SAITO Hiroshi; OHARA Hisaki; SATOH Daisuke; ASANO Shoichiro  IEICE technical report. Communication systems  99-  (338)  13  -20  1999/09
• TCP/IP over ATM over ADSL通信におけるATMトラヒック制御方式(情報・通信ネットワーク(1))

  川原 亮一; 斎藤 洋  日本オペレーションズ・リサーチ学会秋季研究発表会アブストラクト集  1999-  100  -101  1999/09
• Performance of TCP/IP over ATM over ADSL

  KAWAHARA Ryoichi; SAITO Hiroshi  Proceedings of the Society Conference of IEICE  1999-  (2)  93  -93  1999/08
• VP bandwidth estimation on a real network by using ATM Traffic Monitor: ATM Probe98

  Satoh Daisuke; Ohara Hisaki; Saito Hiroshi; Kawahara Ryoichi  Proceedings of the Society Conference of IEICE  1999-  (2)  127  -127  1999/08
• Classification and evaluation of adaptive video transmission methods

  HIRANO Toshiyuki; KAWAHARA Ryoichi  Technical report of IEICE. SSE  98-  (668)  117  -124  1999/03
• B-7-43 New Bandwidth Reservation Method for Delay Tolerant Connections

  KAWAHARA Ryoichi; ISHIBASHI Keisuke; UOSE Hisao  Proceedings of the IEICE General Conference  1999-  (2)  152  -152  1999/03
• Evaluation of ABR Traffic Control for a Mixture of Explicit-Rate and Binary Switches

  KAMADO Yuki; NOGUCHI Hiromi; KAWAHARA Ryoichi; TANIGUCHI Takeshi  Technical report of IEICE. OCS  98-  (569)  49  -54  1999/01
• Real Time Simulator and Traffic Monitoring Method for ATMprobe98

  Ohara Hisaki; Satoh Daisuke; Saito Hiroshi; Kawahara Ryoichi  Proceedings of the Society Conference of IEICE  126  -126  1999
• Implementation of GFR Service Using ABR Control Mechanism

  KAWAHARA Ryoichi; OMOTANI Masaaki; KAMADO Yuki; NAGATA Shunsaku  Proceedings of the Society Conference of IEICE  1998-  (2)  206  -206  1998/09
• Implementation and Resource Management of GFR Service Using ABR Control Mechanism

  KAMADO Yuki; KAWAHARA Ryoichi; NAGATA Syunsaku  Technical report of IEICE. SSE  98-  (241)  59  -66  1998/08
• A Discussion about the buffer size for GFR service using ABR control mechanism

  NAGATA Shunsaku; KAWAHARA Ryoichi; KAMADO Yuki  Technical report of IEICE. SSE  98-  (241)  67  -72  1998/08
• ATM Traffic Control for Guaranteed IP Throughput Using ABR Weighted Bandwidth Allocation

  KAWAHARA Ryoichi  Technical report of IEICE. SSE  98-  (241)  51  -58  1998/08
• Performance Analysis of ATM Traffic Controls with Guaranteed Minimum Cell Rate

  Kawahara Ryoichi; Asaka Takuya; Ozawa Toshihisa  IEICE technical report. Communication systems  98-  (11)  31  -38  1998/04
• ABR Traffic Characteristics in the Presence of CBR/VBR Traffic

  KAWAHARA Ryoichi; SAITO Hiroshi  Technical report of IEICE. SSE  97-  (617)  49  -54  1998/03
• VP Capacity Control in Legacy LAN-ATM Networks Environment Using ABR Weighted Bandwidth Allocation

  KAWAHARA Ryoichi; OZAWA Toshihisa  Proceedings of the IEICE General Conference  1998-  (2)  314  -314  1998/03
• Performance analysis of ATM traffic control mechanisms with guaranteed minimum cell rate

  ASAKA Takuya; KAWAHARA Ryoichi; OZAWA Toshihisa  Proceedings of the IEICE General Conference  194  -194  1998
• A Simple and Efficient ABR Control Algorithm for Weighted Allocation of Bandwidth

  KAWAHARA Ryoichi; OMOTANI Masaaki  SSE97-159  97-  (455)  65  -70  1997/12
• A Simple and Efficient ABR Control Algorithm under PCR/MCR Constraints

  KAWAHARA Ryoichi; SAITO Hiroshi; KAWARASAKI Masatoshi; OMOTANI Masaaki  SSE  97-  (210)  25  -30  1997/07
• An Estimation Method of Acceptable Numer of Calls in a Node for Overload Control

  KAWAHARA Ryoichi; ASAKA Takuya  Proceedings of the Society Conference of IEICE  1995-  (2)  153  -153  1995/09
• マルチサ-ビスを考慮した通信網過負荷制御方式

  朝香 卓也; 川原 亮一  NTT R & D  44-  (4)  p361  -366  1995/04
• A Method of Determining the Acceptable Number of Calls for Each Call Type for an Unspecified Processing Time

  Kawahara Ryoichi; Asaka Takuya  IEICE technical report. Information networks  94-  (369)  75  -82  1994/11
• Determination Method of Acceptable Number of Calls for Each Type under Unspecification of Processing Time

  KAWAHARA Ryoichi; ASAKA Takuya  電子情報通信学会秋季大会講演論文集  1994-  (2)  284  -284  1994/09

Research Grants & Projects

• サイバーフィジカル同時最適化のためのネットワーク制御

  日本学術振興会：科学研究費助成事業

  Date (from‐to) : 2023/04 -2026/03 

  Author : 川原 亮一; 木村 達明

Other link

researchmap

https://researchmap.jp/g0000218011