Kiyohiko OKAYAMA


Design and Implementation of SDN-Based Proactive Firewall System in Collaboration with Domain Name Resolution
Hiroya IKARASHI Yong JIN Nariyoshi YAMAI Naoya KITAGAWA Kiyohiko OKAYAMA 
Publication:   
Publication Date: 2018/11/01
Vol. E101-D  No. 11  pp. 2633-2643
Type of Manuscript:  Special Section PAPER (Special Section on Information and Communication System Security)
Category: Network Security
Keyword: 
firewall systemDNSdomain name resolutionEDNSclient subnet optionSDNOpenFlow
 Summary | Full Text:PDF(1.1MB)

Effect of Premature ACK Transmission Timing on Throughput in TCP with a Performance Enhancing Proxy
Hui WANG Shigeyuki OSADA Tokumi YOKOHIRA Kiyohiko OKAYAMA Nariyoshi YAMAI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/01/01
Vol. E90-B  No. 1  pp. 31-41
Type of Manuscript:  PAPER
Category: Network
Keyword: 
TCPperformance enhancing proxyPEPpremature ACKwatermark
 Summary | Full Text:PDF(814.9KB)

High-Speed Calculation of Worst-Case Link Delays in the EDD Connection Admission Control Scheme
Tokumi YOKOHIRA Kiyohiko OKAYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/07/01
Vol. E89-B  No. 7  pp. 2012-2022
Type of Manuscript:  PAPER
Category: Network
Keyword: 
real time communicationquality of serviceconnection admission controlworst-case link delaysearliest due date first scheduling
 Summary | Full Text:PDF(886.1KB)

Node Placement Algorithms in the Case that Routes are Design Variables in Shuffle-Like Multihop Lightwave Networks
Tokumi YOKOHIRA Kiyohiko OKAYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/12/01
Vol. E88-B  No. 12  pp. 4578-4587
Type of Manuscript:  PAPER
Category: Network
Keyword: 
wavelength-division multiplexinglogical topologyshuffle-like networknode placementwavelength assignment
 Summary | Full Text:PDF(508KB)

An Optical-Drop Wavelength Assignment Algorithm for Efficient Wavelength Reuse under Heterogeneous Traffic in WDM Ring Networks
Nobuo FUNABIKI Jun KAWASHIMA Toru NAKANISHI Kiyohiko OKAYAMA Teruo HIGASHINO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/05/01
Vol. E88-A  No. 5  pp. 1234-1240
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
WDMheuristic algorithmoptical-dropwavelength assignmentring networkNP-complete
 Summary | Full Text:PDF(252.7KB)

A Minimum Dead Space Algorithm for Generalized Isochronous Channel Reuse Problems in DQDB Networks
Nobuo FUNABIKI Jun KAWASHIMA Kiyohiko OKAYAMA Toru NAKANISHI Teruo HIGASHINO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/09/01
Vol. E87-B  No. 9  pp. 2692-2698
Type of Manuscript:  PAPER
Category: Network
Keyword: 
ICRPheuristic algorithmminimum dead spaceNP-completeIEEE 802.6DQDB
 Summary | Full Text:PDF(271KB)

P2PMM_router: A Two-Stage Heuristic Algorithm to Peer-to-Peer Multicast Routing Problems in Multihome Networks
Nobuo FUNABIKI Jun KAWASHIMA Shoji YOSHIDA Kiyohiko OKAYAMA Toru NAKANISHI Teruo HIGASHINO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/05/01
Vol. E87-A  No. 5  pp. 1070-1076
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
peer-to-peer multicastreal-time communicationmultihome networkheuristic algorithmNP-complete
 Summary | Full Text:PDF(260.9KB)

The Design and Implementation of an Authentication System for the Wide Area Distributed Environment
Suguru YAMAGUCHI Kiyohiko OKAYAMA Hideo MIYAHARA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 1991/11/25
Vol. E74-D  No. 11  pp. 3902-3909
Type of Manuscript:  PAPER
Category: Computer Networks
Keyword: 
 Summary | Full Text:PDF(694.6KB)