| 2004/06 - present |
Editorial board member of International Journal of Metadata, Semantics and Ontologies |
| 2008/06 - 2012/05 |
Councilor of Japanese Society for Artificial Intelligence (JSAI) |
| 2005/04 - 2010/03 |
Secretary of the Special Interest Group on Semantic Web and Ontology, JSAI |
| 2006/12 - 2007/11 |
Publicity chair of the 6th International Semantic Web Conference (ISWC2007) |
| 2002/07 - 2007/11 |
Member of Semantic Web Science Association (SWSA) |
| 2003/04 - 2006/03 |
Secretary of the Keihanna Special Interest Group on Web Semantics |
| 2004/07 - 2005/11 |
Editorial committee member of the Special Issue on Ontologies and their Applications, Journal of Japanese Society for Artificial Intelligence |
| 1998/04 - 2005/03 |
Research communicant of the Special Interest Group on Knowledge-Based Systems, JSAI |
| 2003/12 - 2004/11 |
Local organizing committee member of the 3rd International Semantic Web Conference (ISWC2004) |
| 2002/10 - 2004/05 |
Member of Web Ontology Working Group, World Wide Web Consortium (W3C) |
| 2001/01 - 2002/04 |
Editorial committee member of the Special Issue on Knowledge-Based Software Engineering, IEICE Trans. on Information and Systems |
| 2000/07 - 2004/06 |
Councilor of Japanese Society for Artificial Intelligence (JSAI) |
| 2000/02 - 2003/01 |
Advisory board member of the IBROW Project, Information Society Technologies (IST) Program, EU |
| 2000/09 - 2001/08 |
Editorial committee member of Electronic Transactions on Artificial Intelligence (ETAI), Research Area of the Semantic Web |
| 1999/02 - 2000/04 |
Editorial committee member of the Special Issue on Knowledge-Based Software Engineering, IEICE Trans. on Information and Systems |
| 1997/12 - 1998/12 |
Editorial committee member of the Special Issue on Knowledge-Based Software Engineering, IEICE Trans. on Information and Systems |
| 1997/06 - 1998/05 |
Editorial committee member of the Special Issue on Software Agent and its Application, Journal of IEICE(D) |
| 1997/04 - 1997/10 |
Organization committee and executive committee member of Production Scheduling Symposium '97, JSAI |
| 1996/08 - 1998/03 |
Committee member of Ontology Engineering, JIPDEC |
| 1996/03 - 1996/10 |
Executive committee member of Production Scheduling Symposium '96, Japan Industrial Management Association |
| 1994/04 - 1998/03 |
Secretary of the Special Interest Group on Knowledge-Based Systems, JSAI |
| 1995/09 - 1997/03 |
Committee member of Network AI, JIPDEC |
| 1995/03 - 1996/05 |
Committee member of the Working Group for JSAI 10th Anniversary CD-ROM |
| 1994/03 - 1995/09 |
Editorial committee member of the Special Issue on Knowledge-Based Software Engineering, IEICE Trans. on Systems and Information |
| 1993/05 - 2003/04 |
Research communicant of the Special Interest Group on Knowledge-Based Software Engineering, IEICE |
| 1993/04 - 1997/03 |
Research communicant of the Special Interest Group on Artificial Intelligence, IPSJ |
| 1992/06 - 1995/05 |
Editorial board member of Journal of JSAI |
| 2011/12 |
Joint International Semantic Technology Conference (JIST2011) |
| 2011/08 |
The 2011 IEEE/WIC/ACM International Conferences on Web Intelligence and Intelligent Agent Technology (WI-IAT '11) |
| 2010/08 |
The 2010 IEEE/WIC/ACM International Conferences on Web Intelligence and Intelligent Agent Technology (WI-IAT '10) |
| 2010/08 |
The 2nd IEEE Symposium on Web Society (SWS 2010) |
| 2010/05 |
The 7th Extended Semantic Web Conference (ESWC 2010), Demonstration Session |
| 2009/12 |
The 8th IEEE International Conference on Pervasive Intelligence and Computing (PICom-09) |
| 2009/12 |
The 4th International Conference on Pervasive Computing and Applications (ICPCA2009) |
| 2009/10 |
The 8th International Semantic Web Conference (ISWC 2009), Program Committee member for the Demo and Poster track |
| 2009/09 |
The 2009 IEEE/WIC/ACM International Conference on Web Intelligence (WI'09) |
| 2009/05 |
The 6th Annual European Semantic Web Conference (ESWC 2009), PC Vice Chair |
| 2008/12 |
Third Asian Semantic Web Conference (ASWC 2008) |
| 2008/12 |
The 2008 IEEE/WIC/ACM International Conference on Web Intelligence (WI'08) |
| 2008/09 |
The Second International Conference on Advanced Engineering Computing and Applications in Sciences (ADVCOMP 2008) |
| 2008/04 |
Semantic/Data Web track of the 17th International World Wide Web Conference (WWW 2008) |
| 2008/04 |
Browsers and User Interfaces track of the 17th International World Wide Web Conference (WWW 2008) |
| 2008/03 |
The IASTED International Conference on Internet and Multimedia Systems and Applications (EuroIMSA 2008) |
| 2007/11 |
The 6th International Semantic Web Conference and the 2nd Asian Semantic Web Conference, 2007 (ISWC+ASWC'07) |
| 2007/11 |
The First International Conference on Advances in Semantic Processing (SEMAPRO 2007) |
| 2007/11 |
The 2007 IEEE/WIC/ACM International Conference on Web Intelligence (WI'07) |
| 2007/05 |
Semantic Web track of the 16th International World Wide Web Conference (WWW 2007) |
| 2007/05 |
Browsers and User Interfaces track of the 16th International World Wide Web Conference (WWW 2007) |
| 2007/03 |
The IASTED International Conference on Internet and Multimedia Systems and Applications (EuroIMSA 2007) |
| 2006/12 |
The 2006 IEEE/WIC/ACM International Conference on Web Intelligence (WI-06) |
| 2006/11 |
The 5th International Semantic Web Conference (ISWC 2006) |
| 2006/10 |
The 2nd International Conference on Semantics, Knowledge and Grid (SKG2006) |
| 2006/09 |
The 5th International Workshop on Web Semantics (WebS 2006) |
| 2006/09 |
The 1st Asian Semantic Web Conference (ASWC2006) |
| 2006/06 |
The 3rd Annual European Semantic Web Conference (ESWC2006) |
| 2006/06 |
Canadian Semantic Web Working Symposium 2006 |
| 2006/05 |
Semantic Web track of the 15th International World Wide Web Conference (WWW 2006) |
| 2006/02 |
The IASTED International Conference on Internet and Multimedia Systems and Applications (EuroIMSA 2006) |
| 2005/11 |
The 4th International Semantic Web Conference (ISWC 2005) |
| 2005/09 |
The 2005 IEEE/WIC/ACM International Joint Conference on Web Intelligence and Intelligent Agent Technology (WI-IAT 2005) |
| 2005/08 |
The 4th International Workshop on Web Semantics (WebS 2005) |
| 2004/11 |
The 3rd International Semantic Web Conference (ISWC 2004) |
| 2004/09 |
The Eleventh International Conference on Artificial Intelligence: Methodology, Systems, Applications (AIMSA 2004) |
| 2004/09 |
The 3rd International Workshop on Web Semantics (WebS 2004) |
| 2003/10 |
The Second International Semantic Web Conference (ISWC 2003), Senior program committee member |
| 2003/08 |
ACM Hypertext Conference 2003 |
| 2003/05 |
The 16th International FLAIRS Conference, Special Track on Semantic Web |
| 2003/05 |
The 12th International World Wide Web Conference (WWW 2003) |
| 2002/09 |
The Fifth Joint Conference on Knowledge-Based Software Engineering (JCKBSE 2002) |
| 2002/08 |
IFIP World Computer Congress (WCC 2002), Workshop on Intelligent Information Processing (IIP 2002) |
| 2002/06 |
The International Semantic Web Conference (ISWC 2002) |
| 2002/05 |
The 15th International FLAIRS Conference, Special Track on Semantic Web |
| 2002/05 |
The 11th International World Wide Web Conference (WWW 2002) |
| 2001/06 |
International Semantic Web Workshop (SWWS) |
| 2000/09 |
The 4th Joint Conference on Knowledge-Based Software Engineering (JCKBSE 2000) |
| 2000/08 |
The 14th European Conference on Artificial Intelligence (ECAI-00), Workshop on Application of Ontologies and Problem Solving Methods |
| 1999/08 |
The 16th International Conference on Artificial Intelligence (IJCAI-99), Workshop on Ontologies and Problem-Solving Methods |
| 1998/11 |
The 1998 Pacific Rim Knowledge Acquisition Workshop (PKAW '98) |
| 1998/09 |
IFIP World Computer Congress 1998, workshop on Information Technology and Knowledge Systems (IT&KNOWS '98) |
| 1997/08 |
The 15th International Conference on Artificial Intelligence (IJCAI-97), Workshop on Problem-Solving Methods for Knowledge-Based Systems |
| 1997/02 |
The Joint Pacific Asian Conference on Expert Systems/Singapore International Conference on Intelligent Systems (PACIS/SPICIS '97) |
| 1996/10 |
The 1996 Pacific Rim Knowledge Acquisition Workshop (PKAW '96) |
| 1996/09 |
The Second Joint Conference on Knowledge-Based Software Engineering (JCKBSE '96) |
| 1996/03 |
The Third World Congress on Expert Systems (WCES '96) |
| 1995/05 |
Pacific-Asian Conference on Expert Systems '95 (PACES '95) |
| 1994/11 |
The Third Japanese Knowledge Acquisition for Knowledge-based Systems Workshop (JKAW '94) |
| 1994/03 |
'94 Japan/Korea Joint Conference on Expert Systems (JKJCES '94) |
| 1992/11 |
The Second Japanese Knowledge Acquisition for Knowledge-based Systems Workshop (JKAW '92) |