- 2006 - (25) International Organizing Committee for International Workshop on PC and Accelerator Control Systems, Kanagawa,Japan,2006
- 2004 - 2005 (24) International Scientific Advisory Committee for EPS-EPCS/IEEE ICALEPCS-2003,Geneva,Switzerland,CERN,2004~2005.
- 2002 - 2003 (23) International Scientific Advisory Committee for EPS-EPCS/IEEE ICALEPCS-2003, Gyeongju,Korea,2002~2003.
- 2002 - 2003 (22) International Program Committee for EPS-EPCS/IEEE ICALEPCS-2003, Gyeongju,Korea,2002~2003.
- 2002 - 2003 (22) Chairman of the Session for Internet Enhanced Operation and Automations, EPCS-IEEE ICALECPS-2003,Gyeongju,Korea,2002~2003.
- 1999 - 2001 (21) International Scientific Advisory Committee for EPS-EPCS/IEEE ICALEPCS-2001,California, Univ. of Stanford,U.S.A.,1999~2001.
- - 2001 (20) International Program Committee for EPS-EPCS/IEEE ICALEPCS-2001,CERN,Geneva,Switzerland,2000.
- 1998 - 1999 (5)International Scientific Advisory Committee for EPS-EPCS/IEEE ICALEPCS-99, Trieste,Italy,1998~1999.
- 1999 - (19) Chairman of Java Object Oriented Programming for control systems:Tutorial, EPS-EPCS/IEEE ICALEPCS-99, Trieste,Italy,1999.
- 1999 - (18) Chairman of Object Oriented Programming Session, EPS-EPCS/IEEE ICALEPCS-99, Trieste,Italy,1999.
- 1999 - (15)Chairman of Java Programming Session,PCaPAC-99,Tsukuba,Japan,1999.
- 1999 - (14) International Organizing Committee for "The Second International Workshop on Personal Computers and Particle Accelerator Controls(PCaPAC)," Tsukuba, Japan, 1999.
- 1999 - (13) International Program Committee for "The Second International Workshop on Personal Computers and Particle Accelerator Controls(PCaPAC)," 国際科学諮問委員会理事, Tsukuba, Japan, 1999.
- 1999 - (6)Extended International Program Committee for EPS-EPCS/IEEE ICALEPCS-99委員, Trieste,Italy,1999.
- 1996 - 1997 (4)International Scientific Advisory Committee for EPS-EPCS/IEEE ICALEPCS-97,Beijing, China,1996~1997.
- 1997 - (17) Chairman of Object Oriented Programming Session(II), EPS-EPCS/IEEE ICALEPCS-97,Beijing, China,1997.
- 1997 - (16) Chairman of Object Oriented Programming Session(I), EPS-EPCS/IEEE ICALEPCS-97,Beijing, China,1997.
- 1994 - 1995 (12) International Organizing Committee for "International Workshop on Softwarebus Common to Accelerators and Large Experimental Physics Control Systems," CERN,Geneva,Switzerland,1994~1995.
- 1994 - 1995 (11)International Program Committee for "International Workshop on Softwarebus Common to Accelerators and Large Experimental Physics Control Systems,CERN(Conseil Europeen pour la Recherche Nucleaire,Geneva, Switzerland),1994~1995.
- 1994 - 1995 (3)International Scientific Advisory Committee for EPS-EPCS/IEEE ICALEPCS-95,Chicago,U.S.A.1994~1995.
- 1994 - (2) International Official Contact Person of European Physical Society for Interdivisional Experimental Physics Control System Group for Japan (1994)
- 1992 - 1993 (10)International Program Committee for "International Symposium on Sharing Software for Accelerator Control Systems," Hans-Meitner Institute,Berlin, Germany,1992~1993.
- 1993 - (1) International Scientific Advisory Committee for EPS-EPCS/IEEE ICALEPCS-93*),Berlin,Germany,1993.
- 1991 - (9)International Program Committee for "International Symposium on Sharing Software for Accelerator Control Systems," Tsukuba, Japan, 1991.
- 1991 - (7)Organizing Committee for EPS-EPCS/IEEE ICALEPCS-91委員,Tsukuba, Japan, 1991.
- 1988 - (8)Organizing Committee for International Conference on Synchrotron Radiation Instrummentation-88, Tsukuba,Japan,1988.