Design and implementation of a hybrid prefetching proxy server for WWW. - Ken-ichi Chinen; Hiroyuki Inoue; Kiyohiko Okayama; Suguru Yamaguchi (Syst. Comput. Jpn., 1998)

Design and implementation of network management system SPLICE/NM based on scripted operations. - Kiyohiko Okayama; Suguru Yamaguchi; Hideo Miyahara (Syst. Comput. Jpn., 2000)

A dynamic traffic sharing with minimal administration on multihomed networks. - Nariyoshi Yamai; Kiyohiko Okayama; Hiroshi Shimamoto; Takuji Okamoto (ICC, 2001)

New Approach for Configuring Hierarchical Virtual Private Networks Using Proxy Gateways. - Hayato Ishibashi; Kiyohiko Okayama; Nariyoshi Yamai; Kota Abe; Toshio Matsuura (ICOIN, 2003)

A two-stage hierarchical algorithm for wavelength assignment in WDM-based Bidirectional Manhattan Street Networks. - Tomoya Kitani; Masataka Yonedu; Nobuo Funabiki; Tom Nakanishi; Kiyohiko Okayama; Teruo Higashino (ICON, 2003)

A Protection Method Against Massive Error Mails Caused by Sender Spoofed Spam Mails. - Nariyoshi Yamai; Kiyohiko Okayama; Takuya Miyashita; Shin Maruyama; Motonori Nakamura (SAINT, 2005)

An Optical-Drop Wavelength Assignment Algorithm for Efficient Wavelength Reuse under Heterogeneous Traffic in WDM Ring Networks. - Nobuo Funabiki; Jun Kawashima; Toru Nakanishi 001; Kiyohiko Okayama; Teruo Higashino (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2005)

Node Placement Algorithms in the Case that Routes are Design Variables in Shuffle-Like Multihop Lightwave Networks. - Tokumi Yokohira; Kiyohiko Okayama (IEICE Trans. Commun., 2005)

Priority Control in Receiving E-mails by Giving a Separate Response to Each DNS Query. - Shin Maruyama; Motonori Nakamura; Yasuo Okabe; Nariyoshi Yamai; Kiyohiko Okayama; Takuya Miyashita (SAINT, 2006)

High-Speed Calculation of Worst-Case Link Delays in the EDD Connection Admission Control Scheme. - Tokumi Yokohira; Kiyohiko Okayama (IEICE Trans. Commun., 2006)

An Efficient Management Method of Access Policies for Hierarchical Virtual Private Networks. - Kiyohiko Okayama; Nariyoshi Yamai; Hayato Ishibashi; Kota Abe; Toshio Matsuura (COMSWARE, 2007)

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 (IEICE Trans. Commun., 2007)

An Adaptive Route Selection Mechanism per Connection Based on Multipath DNS Round Trip Time on Multihomed Networks. - Yong Jin 001; Nariyoshi Yamai; Kiyohiko Okayama; Motonori Nakamura (SAINT, 2010)

A Dynamic Routing Method for Inbound E-mail Delivery Considering Route and MTA Conditions on Multihomed Environment. - Sho Jitsuto; Yong Jin 001; Kiyohiko Okayama; Nariyoshi Yamai (SAINT, 2010)

A MAC-address Relaying NAT Router for PC Identification from Outside of a LAN. - Ryo Murakami; Nariyoshi Yamai; Kiyohiko Okayama (SAINT, 2010)

A Solution for Mail Forwarding Problem of SPF by Tracing Recipient Addresses. - Takumi Seike; Yong Jin 001; Nariyoshi Yamai; Kiyohiko Okayama; Keita Kawano; Motonori Nakamura (SAINT, 2010)

An Identification Method of PCs behind NAT Router with Proxy Authentication on HTTP Communication. - Yoshiki Ishikawa; Nariyoshi Yamai; Kiyohiko Okayama; Motonori Nakamura (SAINT, 2011)

DNS Resource Record Analysis of URLs in E-Mail Messages for Improving Spam Filtering. - Shuji Suwa; Nariyoshi Yamai; Kiyohiko Okayama; Motonori Nakamura (SAINT, 2011)

A Location Free Network System Applicable to Geographical Terms of the Electronic Journal Site License. - Yoshihiro Ohsumi; Kiyohiko Okayama; Nariyoshi Yamai; Takaoki Fujiwara; Takashi Hieda (SAINT, 2012)

Spam Mail Discrimination System Based on Behavior of DNS Servers Associated with URLs. - Shuji Suwa; Nariyoshi Yamai; Kiyohiko Okayama; Motonori Nakamura; Keita Kawano; Gada (SAINT, 2012)

Multihoming Method Using Routing Header in IPv6 Environment. - Takuya Yamaguchi; Yong Jin 001; Ryoichi Tokumoto; Nariyoshi Yamai; Kiyohiko Okayama; Motonori Nakamura (SAINT, 2012)

E-Mail Priority Delivery System with Dynamic Whitelist in the Layer 3 Switch. - Gada; Nariyoshi Yamai; Kiyohiko Okayama; Keita Kawano; Motonori Nakamura (COMPSAC Workshops, 2013)

Domain Registration Date Retrieval System of URLs in E-Mail Messages for Improving Spam Discrimination. - Masayuki Matsuoka; Nariyoshi Yamai; Kiyohiko Okayama; Keita Kawano; Motonori Nakamura; Masato Minda (COMPSAC Workshops, 2013)

An Optimal Route Selection Mechanism for Outbound Connection on IPv6 Site Multihoming Environment. - Takuya Yamaguchi; Yong Jin 001; Nariyoshi Yamai; Kiyohiko Okayama; Koki Okamoto; Motonori Nakamura (COMPSAC Workshops, 2013)

A Site-Exit Router Selection Method Using Routing Header in IPv6 Site Multihoming. - Yong Jin 001; Takuya Yamaguchi; Nariyoshi Yamai; Kiyohiko Okayama; Motonori Nakamura (Inf. Media Technol., 2013)

A Configuration of Location Free Network Applicable to Location Dependent Services. - Yoshihiro Ohsumi; Kiyohiko Okayama; Nariyoshi Yamai (Inf. Media Technol., 2013)

Performance Improvement of SCTP Communication Using Selective Bicasting on Lossy Multihoming Environment. - Koki Okamoto; Nariyoshi Yamai; Kiyohiko Okayama; Keita Kawano; Motonori Nakamura; Tokumi Yokohira (COMPSAC, 2014)

Domain Registration Date Retrieval System for Improving Spam Mail Discrimination. - Nariyoshi Yamai; Masayuki Matsuoka; Kiyohiko Okayama; Keita Kawano; Motonori Nakamura; Masato Minda (J. Inf. Process., 2014)

Design and Implementation of Client IP Notification Feature on DNS for Proactive Firewall System. - Tomokazu Otsuka; Gada; Nariyoshi Yamai; Kiyohiko Okayama; Yong Jin 001 (COMPSAC Workshops, 2015)

Design and Implementation of Optimal Route Selection Mechanism for Outbound Connections on IPv6 Multihoming Environment. - Yong Jin 001; Nariyoshi Yamai; Kiyohiko Okayama; Motonori Nakamura (J. Inf. Process., 2015)

Design and Implementation of SDN-Based Proactive Firewall System in Collaboration with Domain Name Resolution. - Hiroya Ikarashi; Yong Jin 001; Nariyoshi Yamai; Naoya Kitagawa; Kiyohiko Okayama (IEICE Trans. Inf. Syst., 2018)