Hiroyuki Ohsaki's Home Page


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

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, IEICE, and IPSJ. His e-mail address is ohsaki[atmark]lsnl.jp

Current Research Themes


Large-Scale Network, Complex Network, Network Dynamics, Cloud Networking, Network Virtualization, Social Networking, Network Modeling, Traffic Management, Performance Evaluation, Control Theory, Network Service, Information Diffusion, Data-Centric Networking





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 (Japanese)

Other Tips (Japanese)

Template Files (Japanese)

Experiment Design

General Information


Undergraduate Course

Graduate Course


Queuing theory basics in Information Networking

Original Software

Research Related

  • pdtnsim --- Perl-based DTN Simulator
  • GridFTP-APT --- GridFTP extension to automatically adjust the number of parallel connections in long-fat networks
  • fsim --- High-speed network simulator for large-scale network simulations
  • xdoplot --- An easy-to-use wrapper program for Gnuplot
  • calc --- A simple Perl-based calculator for network engineers/researchers
  • stats --- Calculate several statistics for each column
  • graphtools --- Graph handling libraries and utilities
  • cell --- CELL language interpreter for visualization using SDL/OpenGL/PostScript/AVI/PDF
  • jcorrect --- A simple Japanese grammer checker [Web interface]
  • bibcheck --- A consistency checker for BibTeX files [Web interface]
  • pkingtr --- A simple wrapper for kingtr command (part of IBM Translation King)

Emacs Lisp

TeX/LaTeX Style Files

ns2 (Network Simulator) Related

MIDI Related

  • akaitools --- Tools for Akai S-series samplers
  • sy77tools --- Utilities to manage Yamaha SY77 patch files
  • midi2syx --- A simple Perl script to extract system exclusive chunks from a standard MIDI file

Computer Related

  • casl --- Simple implementation of CASL assembler/COMET simulator in Perl
  • pwm --- A simple but extensible X11 window manager written in Perl
  • xpywm --- A simple but extensible X11 window manager written in Python
  • pwmmon --- A simple Linux status monitor on X11
  • pwmlog --- A simple syslog monitor on X11
  • sample-calc --- A sample calcurator written in Perl with Parse::YYLex and pbyacc (Perl version of Lex/Yacc)

Original Music

Piano Improvisations

These music files are encoded in MP3 format. Play with your favorite MP3 player.

Copyright (C) 2004 Hiroyuki Ohsaki

Contact Information

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)
Last modified: Wed Apr 8 13:30:49 JST 2015