1. IEEE (Life Fellow), Information Theory Society

• Fellows Evaluation Committee Member (Information Theory Society, 2018--2020)
• Paper Awards Committee Member (Information Theory Society, 2010--2011)
• Associate Editor for Shannon Theory, IEEE Transactions on Information Theory（June 2007 -- June 2010）
• IEEE, Information Theory Society, Japan Chapter
  Chair （2002--2003， Best Chapter Award for 2002）
  Vice Chair （2000--2001）
  Secretary (1996--1999）
  (Note: Tokyo Chapter was reorganized as Japan Chapter in 1999.）

2. IEICE (Fellow）

• Committees
  Auditor　(June 2016 -- May 2018)
  Delegate （April 2012 -- March 2015, April 2017 -- March 2021)
  Editor-in-Chief of ESS Socieity (June 2014 -- May 2016)
  Project Commitee Memeber (May 2013 -- June 2017)
  Director (President of ESS Socieity) (May 2012 -- May 2013)
  Director (Junior Presisent of ESS Socieity) (May 2011 -- May 2012)
  Advisor of Edditing Board (May 2011-- May 2014)
  Vice President of ESS Socieity (May 2005 -- May 2006)
  Advisor of Research Committee of Information Theory (May 2002 -- )
  Chair of Resarch Committee of Information Theory (May 2001-- May 2005)
  Vice Chair of Resarch Committee of Information Theory (May 2000 -- May 2001)
  Research Commitee Member of Information Security (May 1992 -- July 2005)
  BOG member of Techinical Socieity of Information Theory and Its Applications (June 944 -- May 1966)
  Symposium Secretary of ESS Socieity (June 1994 -- May 1996)
• IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
  Editor-in-Chief　(May 2009 - May 2011)
  Guest Co-Editor-in-Chief　for "Special Section on Cryptography and Information Security" (Vol.92-A, No.10, 2009)
  Guest Associate Editor for "Special Section on Cryptography and Information Security" (Vol.E84-A, No.1, 2001, and Vol.E83-A, No.1, 2000)
  Guest Associate Editor for "Special section on Information Theory and Its Applications" (Vol.E80-A, No.11, 1997, and Vol.E79-A, No.9, 1996)
• IEICE TRANSACTIONS (Japanese Edition)
  和文論文誌Ａ（基礎・境界）， 「情報論的学習理論小特集（J83-A, No.6, 2000)」編集委員 (Guest Associate Editor)
  和文論文誌Ａ（基礎・境界）， 「代数曲線とその応用小特集（J82-A, No.8, 1999)」編集委員 (Guest Associate Editor)
  和文論文誌Ａ（基礎・境界）， 副編集委員長 (Deputy Editor-in-Chief)（May 1999 -- April 2000）
  和文論文誌Ａ（基礎・境界）， 編集委員(Associate Editor)（May 1997 -- May 2001）
  基礎・境界ソサイエティ誌編集委員(Associate Editor) （May 1995 -- April 1999)
  

3. 日本応用数理学会 (JSIAM)

• 学会誌「応用数理」 (Bulletin of the Japan Society for Industrial and Applied Mathematics, Japanese Edition)
  編集委員会副編集委員長(Deputy Editor-in-Chief)（April 1997 -- March 1998)
  学会誌「応用数理」編集委員会委員 (Associate Editor) （April 1995 -- March 1998）

4. SITA (Society of Information Theory and Its Applications)

• (The SITA was reorganized as the Techinical Society of SITA in IEICE in 2011)
• Advisor (2009--2010）
  President (2008--2009)
  Auditor (2006 -- 2007）
  Vice President (2004 -- 2005）
  Council Person（2002 -- 2003）
  Director (General Affairs) （2000 -- 2001）　　
  Director（without portfolio) (1998 -- 1999）
  Council Person（1996 --1997）
  Director (General Affairs) （1994 --1995)　
  Project Secretary （1993）

5. Conferences

• 2020 IEEE International Symposium on Information Theory (IEEE-ISIT2020), TPC Member
• 2015 IEEE International Symposium on Information Theory (IEEE-ISIT2015), TPC Member
• 2014 International Symposium on Information Theory and its Applications (ISITA2014), International Advisory Commitee Co-chair
• 2012 International Symposium on Information Theory and its Applications (ISITA2012), TPC Member
• 2011 International Symposium on Network Coding (NetCod2011) TPC Member
• 2010 International Symposium on Information Theory and its Applications (ISITA2010), TPC Member
• 2008 International Symposium on Information Theory and its Applications (ISITA2008), TPC Chair
• 2006 IEEE International Symposium on Information Theory (IEEE-ISIT2006), TPC Member
• 4-th Asia-Europe workshop on Information theory (AEW4), Co-Chair
• 2004 International Symposium on Information Theory and its Application (ISITA2004), TPC Co-Chair
• 3rd Asia-Europe workshop on Information theory, TPC Member
• 2003 IEEE International Symposium on Information Theory (IEEE-ISIT2003), TPC Member
• 2000 International Symposium on Information Theory and its Application (ISITA2000), TPC Member
• 1998 Symposium on Cryptography and Information Security (SCIS'98, domestic) TPC Member
• The 19th Symposium on Information Theory and Its Applications (SITA'96, domestic) General Committee Member（General Affairs）
• 1996 International Symposium on Information Theory and Its Application (ISITA'96), TPC Member
• The 18th Symposium on Information Theory and Its Applications (SITA'95, domestic), TPC Member
• The 13th Symposium on Information Theory and Its Applications (SITA'90, domestic) General Committee Member