• 95 Citations
  • 4 h-Index
1990 …2018
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Research Output 1990 2018

  • 95 Citations
  • 4 h-Index
  • 46 Article
  • 24 Conference contribution
2018
1 Citation (Scopus)

Design and implementation of SDN-based proactive firewall system in collaboration with domain name resolution

Ikarashi, H., Jin, Y., Yamai, N., Kitagawa, N. & Okayama, K., Nov 1 2018, In : IEICE Transactions on Information and Systems. E101D, 11, p. 2633-2643 11 p.

Research output: Contribution to journalArticle

Controllers
Servers
Inspection
Intrusion detection
Throughput
2015
1 Citation (Scopus)

Design and implementation of client IP notification feature on DNS for proactive firewall system

Otsuka, T., Gada, Yamai, N., Okayama, K. & Jin, Y., Sep 21 2015, Proceedings - International Computer Software and Applications Conference. IEEE Computer Society, Vol. 3. p. 127-132 6 p. 7273340

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Servers
Communication
Masks
Internet

Design and implementation of optimal route selection mechanism for outbound connections on IPv6 multihoming environment

Jin, Y., Yamai, N., Okayama, K. & Nakamura, M., Jul 15 2015, In : Journal of Information Processing. 23, 4, p. 441-448 8 p.

Research output: Contribution to journalArticle

Routers
Middleware
Internet
Communication
World Wide Web
2014

Domain registration date retrieval system for improving spam mail discrimination

Yamai, N., Matsuoka, M., Okayama, K., Kawano, K., Nakamura, M. & Minda, M., 2014, In : Journal of Information Processing. 22, 3, p. 480-485 6 p.

Research output: Contribution to journalArticle

Websites
Servers
4 Citations (Scopus)

Performance improvement of SCTP communication using selective bicasting on lossy multihoming environment

Okamoto, K., Yamai, N., Okayama, K., Kawano, K., Nakamura, M. & Yokohira, T., Sep 15 2014, Proceedings - International Computer Software and Applications Conference. IEEE Computer Society, p. 551-557 7 p. 6899260

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Wireless networks
Communication
Packet loss
Packet networks
Local area networks
2013

A configuration of location free network applicable to location dependent services

Ohsumi, Y., Okayama, K. & Yamai, N., 2013, In : Journal of Information Processing. 21, 3, p. 433-440 8 p.

Research output: Contribution to journalArticle

Costs
2 Citations (Scopus)

An optimal route selection mechanism for outbound connection on IPv6 site multihoming environment

Yamaguchi, T., Jin, Y., Yamai, N., Okayama, K., Okamoto, K. & Nakamura, M., 2013, Proceedings - International Computer Software and Applications Conference. p. 575-580 6 p. 6605853

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Routers
Middleware
Internet service providers
Internet
Experiments
2 Citations (Scopus)

A site-exit router selection method using routing header in IPv6 site multihoming

Jin, Y., Yamaguchi, T., Yamai, N., Okayama, K. & Nakamura, M., 2013, In : Journal of Information Processing. 21, 3, p. 441-449 9 p.

Research output: Contribution to journalArticle

Routers
Servers
Internet
Middleware
HIgh speed networks
3 Citations (Scopus)

Domain registration date retrieval system of URLs in E-Mail messages for improving spam discrimination

Matsuoka, M., Yamai, N., Okayama, K., Kawano, K., Nakamura, M. & Minda, M., 2013, Proceedings - International Computer Software and Applications Conference. p. 587-592 6 p. 6605855

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electronic mail
Websites

E-mail priority delivery system with dynamic whitelist in the layer 3 switch

Gada, Yamai, N., Okayama, K., Kawano, K. & Nakamura, M., 2013, Proceedings - International Computer Software and Applications Conference. p. 581-586 6 p. 6605854

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electronic mail
Switches
Degradation
2012

A location free network system applicable to geographical terms of the electronic journal site license

Ohsumi, Y., Okayama, K., Yamai, N., Fujiwara, T. & Hieda, T., 2012, Proceedings - 2012 IEEE/IPSJ 12th International Symposium on Applications and the Internet, SAINT 2012. p. 357-362 6 p. 6305311

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Industry
6 Citations (Scopus)

An adaptive route selection mechanism per connection based on multipath DNS round trip time on multihomed networks

Jin, Y., Yamai, N., Okayama, K. & Nakamura, M., 2012, In : Journal of Information Processing. 20, 2, p. 386-395 10 p.

Research output: Contribution to journalArticle

World Wide Web
Internet

Multihoming method using routing header in IPv6 environment

Yamaguchi, T., Jin, Y., Tokumoto, R., Yamai, N., Okayama, K. & Nakamura, M., 2012, Proceedings - 2012 IEEE/IPSJ 12th International Symposium on Applications and the Internet, SAINT 2012. p. 351-356 6 p. 6305310

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Routers
Internet
Servers
Interfaces (computer)
Costs
1 Citation (Scopus)

Spam mail discrimination system based on behavior of DNS servers associated with URLs

Suwa, S., Yamai, N., Okayama, K., Nakamura, M., Kawano, K. & Gada, 2012, Proceedings - 2012 IEEE/IPSJ 12th International Symposium on Applications and the Internet, SAINT 2012. p. 381-386 6 p. 6305315

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Websites
Servers
Fluxes
Botnet
2011
3 Citations (Scopus)

An identification method of PCs behind NAT router with proxy authentication on HTTP communication

Ishikawa, Y., Yamai, N., Okayama, K. & Nakamura, M., 2011, Proceedings - 11th IEEE/IPSJ International Symposium on Applications and the Internet, SAINT 2011. p. 445-450 6 p. 6004120

Research output: Chapter in Book/Report/Conference proceedingConference contribution

HTTP
Routers
Authentication
Communication
Access control
2 Citations (Scopus)

DNS resource record analysis of URLs in e-mail messages for improving spam filtering

Suwa, S., Yamai, N., Okayama, K. & Nakamura, M., 2011, Proceedings - 11th IEEE/IPSJ International Symposium on Applications and the Internet, SAINT 2011. p. 439-444 6 p. 6004119

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Websites
Fluxes
Botnet

インバウンド接続に適用可能なNATによるマルチホーム化手法(共著)

Okayama, K., 2011, In : 情報処理学会論文誌. 52, 12, p. 3745-3754 10 p.

Research output: Contribution to journalArticle

A dynamic routing method for inbound e-mail delivery considering route and MTA conditions on multihomed environment

Jitsuto, S., Jin, Y., Okayama, K. & Yamai, N., 2010, Proceedings - 2010 10th Annual International Symposium on Applications and the Internet, SAINT 2010. p. 245-248 4 p. 5598133

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Dynamic loads
Resource allocation
3 Citations (Scopus)

A MAC-address relaying NAT router for PC identification from outside of a LAN

Murakami, R., Yamai, N. & Okayama, K., 2010, Proceedings - 2010 10th Annual International Symposium on Applications and the Internet, SAINT 2010. p. 237-240 4 p. 5598135

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Routers
Local area networks
Access control
Servers
1 Citation (Scopus)

An adaptive route selection mechanism per connection based on multipath DNS round trip time on multihomed networks

Jin, Y., Yamai, N., Okayama, K. & Nakamura, M., 2010, Proceedings - 2010 10th Annual International Symposium on Applications and the Internet, SAINT 2010. p. 52-58 7 p. 5598175

Research output: Chapter in Book/Report/Conference proceedingConference contribution

World Wide Web
Internet
3 Citations (Scopus)

A solution for mail forwarding problem of SPF by tracing recipient addresses

Seike, T., Jin, Y., Yamai, N., Okayama, K., Kawano, K. & Nakamura, M., 2010, Proceedings - 2010 10th Annual International Symposium on Applications and the Internet, SAINT 2010. p. 129-132 4 p. 5598160

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Authentication
Experiments
2009

SMTPセッションの強制切断によるspamメール対策

Okayama, K., 2009, In : 情報処理学会論文誌. 50, 3, p. 940-949 10 p.

Research output: Contribution to journalArticle

2008

An Anti-Spam Method with SMTP Session Abort

Okayama, K., 2008, In : Proc. of the MIT Spam Conference 2008.

Research output: Contribution to journalArticle

無線LAN環境における二重暗号化回避による通信効率の改善手法

Okayama, K., 2008, In : 情報処理学会論文誌. 49, 3, p. 1072-1080 9 p.

Research output: Contribution to journalArticle

階層型VPNにおける仮想リンクの透過的確立手法

Okayama, K., 2008, In : 情報処理学会論文誌. 49, 3, p. 1090-1096 7 p.

Research output: Contribution to journalArticle

2007
2 Citations (Scopus)

An efficient management method of access policies for hierarchical virtual private networks

Okayama, K., Yamai, N., Ishibashi, H., Abe, K. & Matsuura, T., 2007, Proceedings of the 2007 2nd International Conference on Communication System Software and Middleware and Workshops, COMSWARE 2007. 4268017

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Virtual private networks
Servers
Internet
Authentication
Cryptography
3 Citations (Scopus)

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

Wang, H., Osada, S., Yokohira, T., Okayama, K. & Yamai, N., Jan 2007, In : IEICE Transactions on Communications. E90-B, 1, p. 31-41 11 p.

Research output: Contribution to journalArticle

Throughput
Beer
Routers

大規模VLAN環境におけるVLANの相互接続方式

Okayama, K., 2007, In : 情報処理学会論文誌. 48, 4, p. 1584-1594 11 p.

Research output: Contribution to journalArticle

2006
1 Citation (Scopus)
Access control
Packet networks
Communication
3 Citations (Scopus)

Priority control in receiving E-mails by giving a separate response to each DNS query

Maruyama, S., Yamai, N., Nakamura, M., Okayama, K., Okabe, Y. & Miyashita, T., 2006, Proceedings - 2006 International Symposium on Applications and the Internet, SAINT 2006. Vol. 2006. p. 90-93 4 p. 1581317

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electronic mail
Servers
3 Citations (Scopus)

Throughput optimization in TCP with a performance enhancing proxy

Osada, S., Wang, H., Yokohira, T., Fukushima, Y., Okayama, K. & Yamai, N., 2006, International Conference on Communication Technology Proceedings, ICCT. 4146499

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Throughput
Routers

動的に応答を変えるDNSを利用した電子メール受信の優先制御

Okayama, K., 2006, In : 情報処理学会論文誌. 47, 4, p. 1021-1030 10 p.

Research output: Contribution to journalArticle

発信者詐称spamメールに起因するバウンスメール集中への対策方法

Okayama, K., 2006, In : 情報処理学会論文誌. 47, (4), p. 1010-1020 11 p.

Research output: Contribution to journalArticle

階層型VPNにおける効率的なアクセスポリシ管理手法

Okayama, K., 2006, In : 情報処理学会論文誌. 47, (4), p. 1136-1145 10 p.

Research output: Contribution to journalArticle

2005

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

Yokohira, T., Okayama, K., Murakami, T. & Takarako, K., 2005, 6th Asia-Pacific Symposium on Information and Telecommunication Technologies, APSITT 2005 - Proceedings. Vol. 2005. p. 89-94 6 p. 1593443

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Mobile agents
Application programming interfaces (API)
Recovery
1 Citation (Scopus)

A method of dynamic interconnection of VLANs for large scale VLAN environment

Okayama, K., Yamai, N., Miyashita, T., Kawano, K. & Okamoto, T., 2005, 6th Asia-Pacific Symposium on Information and Telecommunication Technologies, APSITT 2005 - Proceedings. Vol. 2005. p. 427-432 6 p. 1593504

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Local area networks
Authentication
Managers
Servers
Switches
3 Citations (Scopus)
Wavelength Assignment
Ring Network
Multiplexing
Wavelength division multiplexing
Telecommunication traffic
6 Citations (Scopus)

A protection method against massive error mails caused by sender spoofed spam mails

Yamai, N., Okayama, K., Miyashita, T., Maruyama, S. & Nakamura, M., 2005, Proceedings - 2005 Symposium on Applications and the Internet, SAINT'2005. p. 384-390 7 p. 1386138

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Servers
Topology
Packet networks
Wavelength division multiplexing
Transmitters
Tuning
4 Citations (Scopus)

Performance improvement of TCP using performance enhancing proxies - Effect of premature ACK transmission timing on throughput

Osada, S., Yokohira, T., Hui, W., Okayama, K. & Yamai, N., 2005, 6th Asia-Pacific Symposium on Information and Telecommunication Technologies, APSITT 2005 - Proceedings. Vol. 2005. p. 7-12 6 p. 1593429

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Throughput
Beer
Routers

大規模組織におけるPOP before SMTPに基づく管理の容易な電子メール運用方法

Okayama, K., 2005, In : 情報処理学会論文誌. 46, (4), p. 1041-1050 10 p.

Research output: Contribution to journalArticle

2004

A minimum dead space algorithm for generalized isochronous channel reuse problems m DQDB networks

Funabiki, N., Kawashima, J., Okayama, K., Nakanishi, T. & Higashino, T., Sep 2004, In : IEICE Transactions on Communications. E87-B, 9, p. 2692-2698 7 p.

Research output: Contribution to journalArticle

Metropolitan area networks
Broadband networks
Telecommunication networks
Internet
Network protocols

P2PMM_router: A two-stage heuristic algorithm to peer-to-peer multicast routing problems in multihome networks

Funabiki, N., Kawashima, J., Yoshida, S., Okayama, K., Nakanishi, T. & Higashino, T., May 2004, In : IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences. E87-A, 5, p. 1070-1076 7 p.

Research output: Contribution to journalArticle

Multicast Routing
Routing Problem
Heuristic algorithms
Peer to Peer
Router