Ryoichi Kawahara

According to our database, Ryoichi Kawahara authored at least 90 papers between 1997 and 2023.

Collaborative distances:

• Dijkstra number of four.
• Erdős number of four.

2023

Optimizing Edge-Cloud Cooperation for Machine Learning Accuracy Considering Transmission Latency and Bandwidth Congestion.

Kengo Tajiri, Ryoichi Kawahara, Yoichi Matsuo

IEICE Trans. Commun., September, 2023

Optimizing Data Distribution for Federated Learning Under Bandwidth Constraint.

Kengo Tajiri, Ryoichi Kawahara

Proceedings of the IEEE International Conference on Communications, 2023

Data Transfer for Balancing Model Convergence and Training Time in Federated Learning.

Kengo Tajiri, Ryoichi Kawahara

Proceedings of the IEEE Global Communications Conference, 2023

2022

Virtual Network Control for Power Bills Reduction and Network Stability.

Ryota Nakamura, Ryoichi Kawahara, Takefumi Wakayama, Shigeaki Harada

IEEE Trans. Netw. Serv. Manag., December, 2022

Cooperative Multi-Agent Deep Reinforcement Learning for Dynamic Virtual Network Allocation With Traffic Fluctuations.

Akito Suzuki, Ryoichi Kawahara, Shigeaki Harada

IEEE Trans. Netw. Serv. Manag., 2022

Network Tomography for Information-Centric Networking.

Ryoichi Kawahara, Takuya Yano, Rie Tagyo, Daisuke Ikegami

IEICE Trans. Commun., 2022

2021

Cooperative Multi-Agent Deep Reinforcement Learning for Dynamic Virtual Network Allocation.

Akito Suzuki, Ryoichi Kawahara, Shigeaki Harada

Proceedings of the 30th International Conference on Computer Communications and Networks, 2021

2020

Extendable NFV-Integrated Control Method Using Reinforcement Learning.

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

IEICE Trans. Commun., 2020

Modeling Upper Layer Reaction to QoS Degradation as a Congestion Avoidance Mechanism.

Shigeaki Harada, Keisuke Ishibashi, Ryoichi Kawahara

IEICE Trans. Commun., 2020

2019

Inferring Latent Traffic Demand Offered to an Overloaded Link with Modeling QoS-Degradation Effect.

Keisuke Ishibashi, Shigeaki Harada, Ryoichi Kawahara

IEICE Trans. Commun., 2019

2018

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 Trans. Inf. Syst., 2018

Anomaly Detection and Interpretation using Multimodal Autoencoder and Sparse Optimization.

Yasuhiro Ikeda, Keisuke Ishibashi, Yuusuke Nakano, Keishiro Watanabe, Ryoichi Kawahara

CoRR, 2018

Network Tomography Using Routing Probability for Virtualized Network.

Rie Tagyo, Daisuke Ikegami, Ryoichi Kawahara

Proceedings of the 2018 IEEE International Conference on Communications, 2018

Root-Cause Diagnosis for Rare Failures Using Bayesian Network with Dynamic Modification.

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

Proceedings of the 2018 IEEE International Conference on Communications, 2018

Root-Cause Diagnosis Using Logs Generated by User Actions.

Hiroki Ikeuchi, Akio Watanabe, Takehiro Kawata, Ryoichi Kawahara

Proceedings of the IEEE Global Communications Conference, 2018

System design for predictive road-traffic information delivery using edge-cloud computing.

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

Proceedings of the 15th IEEE Annual Consumer Communications & Networking Conference, 2018

2017

Geometrical Characterization of Offloading through Wireless LANs.

Hiroshi Saito, Ryoichi Kawahara

IEEE Trans. Mob. Comput., 2017

Name Resolution Based on Set of Attribute-Value Pairs of Real-World Information.

Ryoichi Kawahara, Hiroshi Saito

IEICE Trans. Commun., 2017

Disaster avoidance control against heavy rainfall.

Hiroshi Saito, Hirotada Honda, Ryoichi Kawahara

Proceedings of the 2017 IEEE Conference on Computer Communications, 2017

2016

Modeling Urban ITS Communication via Stochastic Geometry Approach.

Tatsuaki Kimura, Hiroshi Saito, Hirotada Honda, Ryoichi Kawahara

Proceedings of the IEEE 84th Vehicular Technology Conference, 2016

2015

Homology-based metaheuristics for cell planning with macroscopic diversity using sector antennas.

Yasuhiro Ikeda, Ryoichi Kawahara, Hiroshi Saito

Proceedings of the 2015 IEEE International Conference on Communications, 2015

2014

An Online Framework for Flow Round Trip Time Measurement.

Xinjie Guan, Xili Wan, Ryoichi Kawahara, Hiroshi Saito

IEICE Trans. Commun., 2014

Theoretical Evaluation of Offloading through Wireless LANs.

Hiroshi Saito, Ryoichi Kawahara

CoRR, 2014

Cell Planning with Macroscopic Diversity: Optimal Cell Deployment and SINR Evaluation under Frequency Scheduling.

Yasuhiro Ikeda, Hiroshi Saito, Ryoichi Kawahara

Proceedings of the IEEE 79th Vehicular Technology Conference, 2014

Mobile QoS tomography using compressed sensing.

Ryoichi Kawahara, Yoshihide Tonomura

Proceedings of the 2014 26th International Teletraffic Congress (ITC), 2014

2013

Analyzing influence of network topology on designing ISP-operated CDN.

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

Telecommun. Syst., 2013

Optimally Identifying Worm-Infected Hosts.

Noriaki Kamiyama, Tatsuya Mori, Ryoichi Kawahara, Shigeaki Harada

IEICE Trans. Commun., 2013

Optimally Designing ISP-Operated CDN.

Noriaki Kamiyama, Tatsuya Mori, Ryoichi Kawahara, Haruhisa Hasegawa

IEICE Trans. Commun., 2013

Multicast Pre-Distribution VoD System.

Noriaki Kamiyama, Ryoichi Kawahara, Tatsuya Mori, Haruhisa Hasegawa

IEICE Trans. Commun., 2013

Effect of Limiting Pre-Distribution and Clustering Users on Multicast Pre-Distribution VoD.

Noriaki Kamiyama, Ryoichi Kawahara, Tatsuya Mori, Haruhisa Hasegawa

IEICE Trans. Commun., 2013

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 Trans. Commun., 2013

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

Comput. Networks, 2013

Autonomic load balancing of flow monitors.

Noriaki Kamiyama, Tatsuya Mori, Ryoichi Kawahara

Comput. Networks, 2013

Optimum profit allocation in coalitional VoD service.

Noriaki Kamiyama, Ryoichi Kawahara, Haruhisa Hasegawa

Comput. Networks, 2013

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, 2013

Analysis of content charge by ISPs.

Noriaki Kamiyama, Ryoichi Kawahara

Proceedings of the 2013 IFIP/IEEE International Symposium on Integrated Network Management (IM 2013), 2013

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

Proceedings of the International Conference on Information Networking 2013, 2013

2012

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 Trans. Inf. Syst., 2012

Analyzing and Reducing the Impact of Traffic on Large-Scale NAT.

Ryoichi Kawahara, Tatsuya Mori, Takeshi Yada, Noriaki Kamiyama

IEICE Trans. Commun., 2012

Effects of Sampling and Spatio/Temporal Granularity in Traffic Monitoring on Anomaly Detectability.

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

IEICE Trans. Commun., 2012

Autonomic load balancing for flow monitoring.

Noriaki Kamiyama, Tatsuya Mori, Ryoichi Kawahara

Proceedings of IEEE International Conference on Communications, 2012

2011

Detection accuracy of network anomalies using sampled flow statistics.

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

Int. J. Netw. Manag., 2011

Parallel video streaming optimizing network throughput.

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

Comput. Commun., 2011

Optimally designing caches to reduce P2P traffic.

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

Comput. Commun., 2011

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, 2011

Traffic Engineering Using Overlay Network.

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

Proceedings of IEEE International Conference on Communications, 2011

Performance evaluation of peer-assisted content distribution.

Ryoichi Kawahara, Noriaki Kamiyama, Tatsuya Mori, Haruhisa Hasegawa

Proceedings of the 2011 IEEE Consumer Communications and Networking Conference, 2011

2010

Characterizing Traffic Flows Originating from Large-Scale Video Sharing Services.

Tatsuya Mori, Ryoichi Kawahara, Haruhisa Hasegawa, Shinsuke Shimogawa

Proceedings of the Traffic Monitoring and Analysis, Second International Workshop, 2010

Impact of topology on parallel video streaming.

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

Proceedings of the IEEE/IFIP Network Operations and Management Symposium, 2010

Profit Allocation in Coalitional VoD Service.

Noriaki Kamiyama, Ryoichi Kawahara, Haruhisa Hasegawa

Proceedings of the MASCOTS 2010, 2010

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, 2010

2009

On the Quality of Triangle Inequality Violation Aware Routing Overlay Architecture.

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

Proceedings of the INFOCOM 2009. 28th IEEE International Conference on Computer Communications, 2009

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, 2009

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, 2009

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, 2009

2008

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

Perform. Evaluation, 2008

Packet Sampling TCP Flow Rate Estimation and Performance Degradation Detection Method.

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

IEICE Trans. Commun., 2008

Finding Cardinality Heavy-Hitters in Massive Traffic Data and Its Application to Anomaly Detection.

Keisuke Ishibashi, Tatsuya Mori, Ryoichi Kawahara, Yutaka Hirokawa, Atsushi Kobayashi, Kimihiro Yamamoto, Hitoaki Sakamoto, Shoichiro Asano

IEICE Trans. Commun., 2008

Extracting Worm-Infected Hosts Using White List.

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

Proceedings of the 2008 International Symposium on Applications and the Internet, 2008

Optimum Identification of Worm-Infected Hosts.

Noriaki Kamiyama, Tatsuya Mori, Ryoichi Kawahara, Shigeaki Harada

Proceedings of the IP Operations and Management, 8th IEEE International Workshop, 2008

Identifying Anomalous Traffic Sources Using Flow Statistics.

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

Proceedings of the Global Communications Conference, 2008. GLOBECOM 2008, New Orleans, LA, USA, 30 November, 2008

A Method of Detecting Network Anomalies in Cyclic Traffic.

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

Proceedings of the Global Communications Conference, 2008. GLOBECOM 2008, New Orleans, LA, USA, 30 November, 2008

Detection of Leaps/sLumps in Traffic Volume of Internet Backbone.

Yutaka Hirokawa, Kimihiro Yamamoto, Shigeaki Harada, Ryoichi Kawahara

Proceedings of the Challenges for Next Generation Network Operations and Service Management, 2008

2007

Identifying Heavy-Hitter Flows from Sampled Flow Statistics.

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

IEICE Trans. Commun., 2007

Inferring Original Traffic Pattern from Sampled Flow Statistics.

Tatsuya Mori, Ryoichi Kawahara, Noriaki Kamiyama, Shigeaki Harada

Proceedings of the 2007 International Symposium on Applications and the Internet, 2007

A Study on Detecting Network Anomalies Using Sampled Flow Statistics.

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

Proceedings of the 2007 International Symposium on Applications and the Internet, 2007

2-D Bitmap for Summarizing Inter-Host Communication Patterns.

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

Proceedings of the 2007 International Symposium on Applications and the Internet, 2007

Simple and Adaptive Identification of Superspreaders by Flow Sampling.

Noriaki Kamiyama, Tatsuya Mori, Ryoichi Kawahara

Proceedings of the INFOCOM 2007. 26th IEEE International Conference on Computer Communications, 2007

Efficient Timeout Checking Mechanism for Traffic Control.

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

Proceedings of the 16th International Conference on Computer Communications and Networks, 2007

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

2006

QoS-Aware Overlay Routing with Limited Number of Alternative Route Candidates and Its Evaluation.

Masato Uchida, Satoshi Kamei, Ryoichi Kawahara, Takeo Abe

IEICE Trans. Commun., 2006

Detection of TCP Performance Degradation Using Link Utilization Statistics.

Keisuke Ishibashi, Ryoichi Kawahara, Takuya Asaka, Masaki Aida, Satoshi Ono, Shoichiro Asano

IEICE Trans. Commun., 2006

Performance Evaluation of QoS-Aware Routing in Overlay Network.

Masato Uchida, Satoshi Kamei, Ryoichi Kawahara

Proceedings of the Information Networking, 2006

Estimating Top N Hosts in Cardinality Using Small Memory Resources.

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

Proceedings of the 22nd International Conference on Data Engineering Workshops, 2006

QoS control to handle long-duration large flows and its performance evaluation.

Ryoichi Kawahara, Tatsuya Mori, Takeo Abe

Proceedings of IEEE International Conference on Communications, 2006

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, 2006

2005

Method of Bandwidth Dimensioning and Management for Aggregated TCP Flows with Heterogeneous Access Links.

Ryoichi Kawahara, Keisuke Ishibashi, Tatsuya Mori, Toshihisa Ozawa, Takeo Abe

IEICE Trans. Commun., 2005

A Method of Bandwidth Dimensioning and Management Using Flow Statistics.

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

IEICE Trans. Commun., 2005

2004

On the Characteristics of Internet Traffic Variability: Spikes and Elephants.

Tatsuya Mori, Ryoichi Kawahara, Shozo Naito, Shigeki Goto

IEICE Trans. Inf. Syst., 2004

Identifying elephant flows through periodically sampled packets.

Tatsuya Mori, Masato Uchida, Ryoichi Kawahara, Jianping Pan, Shigeki Goto

Proceedings of the 4th ACM SIGCOMM Internet Measurement Conference, 2004

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, 2004

Detection of TCP performance degradation using link utilization statistics.

Keisuke Ishibashi, Ryoichi Kawahara, Aida Takuya, Asaka Masaki

Proceedings of the Global Telecommunications Conference, 2004. GLOBECOM '04, Dallas, Texas, USA, 29 November, 2004

2003

A method of IP traffic management using TCP flow statistics.

Ryoichi Kawahara, Keisuke Ishibashi, Takuya Asaka, Katsunori Ori

Proceedings of the Global Telecommunications Conference, 2003

2002

Analysis of Non-Gaussian Nature of Network Traffic and its Implication on Network Performance

Tatsuya Mori, Ryoichi Kawahara, Shozo Naito

CoRR, 2002

Analysis of Non-Gaussian Nature of Network Traffic

Tatsuya Mori, Ryoichi Kawahara, Shozo Naito

CoRR, 2002

Dynamically weighted queueing for fair bandwidth allocation and its performance analysis.

Ryoichi Kawahara, Naohisa Komatsu

Proceedings of the IEEE International Conference on Communications, 2002

Evaluation of congestion control of the PDC mobile packet data communication system.

Keiko Yoshihara, Toshihiro Suzuki, Akira Miura, Ryoichi Kawahara

Proceedings of the Global Telecommunications Conference, 2002

2001

Traffic measurement and analysis in an ATM-based internet backbone.

Ryoichi Kawahara, Keisuke Ishibashi, Toshiyuki Hirano, Hiroshi Saito, Hisaki Ohara, Daisuke Satoh, Shoichiro Asano, Jun Matsukata

Comput. Commun., 2001

1998

Characteristics of ABR explicit rate control algorithms in WAN environments and an ABR control algorithm suitable for public networks.

Ryoichi Kawahara, Hiroshi Saito, Masatoshi Kawarasaki

Int. J. Commun. Syst., 1998

1997

Characteristics of ABR Explicit Rate Control Algorithms in WAN Environment.

Ryoichi Kawahara, Arata Koike, Mika Ishizuka, Masahito Koshiishi, Masatoshi Kawarasaki

Proceedings of the 1997 IEEE International Conference on Communications: Towards the Knowledge Millennium, 1997