Major Projects Information Management Technology for Synthetic Environment and Test Systems, Agency for Defense Development, 2011~2016 Technologies for Mobile Social Network Based Services in Web 3.0, Korea Ministry of Education, Science and Technology, 2009~2014 Communication Technology Supporting an Unmanned Battle System:  Ubiquitous Sensor Networks, Agency for Defense Development, 2006~2012 on Target Image Database Technology, Agency for Defense Development, 2004 - 2010 on XML Repository and Semantic Web, Korea Ministry of Information and Communication, 2002 - 2010 on Similarity Search for Distributed Multimedia Information on the Internet, Korea Research Foundation, 2000 - 2002 of Web-based Spatial Object-Oriented Database Management Technology, Korea Ministry of Science and Technology, 1998 - 2000 of Spatial object Management System, Korea Ministry of Science and Technology, 1995 - 1998 on Modeling and Search of Multimedia Databases for Multimedia-on-Demand, Korea Science Foundataion, 1995 - 1998 on Management and Retrieval of Multimedia Databases, Samsung Corp., 1996 - 1997 on Traffic Information Systems, Korea Ministry of Science and Technology, 1995 - 1996 of a Heterogeneous Distributed Database System, General Motors Corp., 1986 - 1990