Hiroyuki Ohsaki's Home Page

[Japanese w/ Google Translate]

lesser panda
My favorite animal in the world...Lesser Panda (Copyright (C) 2004 Hiroyuki Ohsaki)
lesser panda

Hiroyuki Ohsaki received the M. E. degree in the Information and Computer Sciences from Osaka University, Osaka, Japan, in 1995. He also received the Ph. D. degree from Osaka University, Osaka, Japan, in 1997. He is currently a professor at Department of Informatics, School of Science and Technology, Kwansei Gakuin University, Japan. His research work is in the area of design, modeling, and control of large-scale communication networks. He is a member of IEEE and IEICE. His e-mail address is ohsaki[atmark]lsnl.jp

Current Research Themes

Design, Modeling, and Control of Large-Scale Communication Networks

  • Large-Scale Network
  • Network Architecture
  • Complex Network
  • Future Internet
  • Information-Centric Networking
  • Delay/Disruption-Tolerant Networking
  • Social Networking
  • Automotive Network
  • Graph Neural Network
  • Transport Protocol
  • Control Theory

Link to introduction to my research themes (in Japanese)

pdtnsim pdfcsim geographic CCN WSN cascade


Research Papers


Master's Thesis

  • "Performance evaluation of rate-based congestion control methods in ATM networks" [PostScript] [PDF]

Ph. D. Thesis

  • "Studies on congestion control schemes for best-effort traffic in ATM networks" [PostScript] [PDF]

Research Tips

Tips Series (in Japanese)

Other Tips (in Japanese)

Template Files (in Japanese)

Experiment Design

General Information


Undergraduate Course

Graduate Course

Queuing theory basics in Information Networking

Original Software

If you are looking for useful tools, check xpywm/xpymon/xpylog, sendscreen, calc, and stats at first. If you are a programmer, check tbdump. If you are an academic researcher, check cellx, xdoplot, doc-annotate.el, revhistory.sty, and format-paragraph.el. If you are a student, check jcorrect and bibcheck as well.

Desktop Environment

  • xpywm --- a simple but extensible X11 window manager written in Python
  • xpymon --- a versatile WiFi/network/battery/CPU/video system monitor on Linux
  • xpylog --- an xconsole-like syslog monitor on X11
  • pwm --- a simple but extensible X11 window manager written in Perl
  • pwmmon --- a simple Linux status monitor on X11
  • pwmlog --- a simple syslog monitor on X11


  • sendscreen --- display local desktop on remove host over LAN without VGA/HDMI cable
  • calc --- a simple Perl-based calculator for network engineers/researchers
  • stats --- calculate several statistics for each column
  • casl --- simple implementation of CASL assembler/COMET simulator in Perl
  • sample-calc --- a sample calcurator written in Perl with Parse::YYLex and pbyacc (Perl version of Lex/Yacc)

Python Modules

  • tbdump --- display helpful information for debbugging in case of errors/exceptions
  • ansiterm --- change color and style (bold, reverse) of text on display
  • perlcompat --- Perl-like utility functions such as warn, die, getopt, and require

Tools for Experiments

  • graph-tools --- tools for graph theory and network science with many generation models
  • graphtools --- Graph handling libraries and utilities

Tools for Visualization

  • cellx --- command-driven drawing/visualization/animation/presentation tool
  • cell --- CELL language interpreter for visualization using SDL/OpenGL/PostScript/AVI/PDF
  • xdoplot --- An easy-to-use wrapper program for Gnuplot

Tools for Writing

  • format-paragraph.el --- format Japanese paragraph for easier reading/editing
  • doc-annotate.el doc-annotate-clip --- a Major-mode for editing and viewing annotations for an image file
  • jcorrect --- A simple Japanese grammer checker
  • jcorrect.el --- run grammer checker using jcorrect command
  • bibcheck --- A consistency checker for BibTeX files
  • pkingtr--- A simple wrapper for kingtr command (part of IBM Translation King)
  • king.el --- translate line/region using IBM Translation King (Honyaku-no-Ousama)

TeX/LaTeX Style Files

Network Simulators

  • dtnsim --- DTN (Delay/Disruption Tolerant Networking) simulator with several agent/mobility models
  • pdtnsim --- Perl-based DTN Simulator

Research Outcomes

  • fsim --- High-speed network simulator for large-scale network simulations
  • GridFTP-APT --- GridFTP extension to automatically adjust the number of parallel connections in long-fat networks

ns2 (Network Simulator) Extensions

Emacs Lisp

MIDI Related

Original Music

Piano Improvisations

  • 2004/08/16 [MP3] --- For the day we met each other (Copyright (C) 2004 Hiroyuki Ohsaki)
  • 2004/10/31 [MP3] --- Looking back the moment (Copyright (C) 2004 Hiroyuki Ohsaki)
Copyright (C) 2004 Hiroyuki Ohsaki

Contact Information

Sanda campus
Our laboratory is located on the 4th floor of Building IV (School of Sience Technology) in KSC (Kobe-Sanda Campus).

Laboratory Location

Department of Informatics
School of Science and Technology, Kwansei Gakuin University
2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
Tel: +81-79-565-8736
Fax: +81-79-565-9077
E-mail: ohsaki[atmark]lsnl.jp


Directions (Japanese)

Hiroyuki Ohsaki (ohsaki[atmark]lsnl.jp)