- 2008 - - IEICE Communications Society, President 2008.
- 2007 - - IEICE Communications Society, President-Elect 2007
- 2004 - - Chair-Elect, IEEE COMSOC Communication Quality and Reliability Technical Committee (CQR), 2004-.
- 2002 - 2003 - Vice Chair, IEEE COMSOC Communication Quality and Reliability Technical Committee (CQR), 2002-2003.
- 2003 - - Vice Chair, IEEE CMSOC Japan Chapter, 2003-.
- 2003 - - General Chair, 7-th Asia Pacific Network Operations and Management Symposium (APNOMS 2003), co-supported by IEEE CNOM and IEEE APB, Fukuoka, Japan, 2003.
- 2002 - - Technical Program Chair, CQR Workshop, co-sponsored by IEEE COMSOC CQR TC, Okinawa, Japan, 2002.
- 2000 - 2001 - IEICE board member, 2000-2001, 2003-2005,
- 2001 - - Co-Head Referee, Quality of Service in Computer Networks Track, IEEE Globecom 2001.
- 1998 - 1999 - Chair, IEICE Communication Quality Committee, 1998-1999.
- 1995 - 1998 - Secretary and Treasurer, IEEE COMSOC Tokyo Chapter, 1995-1998.
- 1992 - 1998 - International Scientific Member, Network Planning Symposium, 1992-1998.
- 1998 - - Editor, Journal of Communications and Networks (JCN), 1998-.
- 1990 - - Co-guest editor, Special issue on Advanced Traffic Control Methods for Circuit Switched Telecommunications Networks, IEEE Communication Magazine, Vol. 28, No.10, 1990.
- 1980 - 1984 - Secretary, IEEE COMSOC Asian Pacific Committee, 1980-1984.
- 1970 - 電子情報通信学会 委員長、評議員