1991.1-1992.7: KAIST, Senior research scientist (Localization of X window systems, G7 project, group communication)
1988.4-1991.1: HP (U.S.A.), Information Technology Operation, Senior MTS (Distributed object managemet facility (New Wave), next generation UIMS)
1987.3-1988.4: KAIST, Researcher (Distributed application system environment)
Research Interests
Mobile Computing, Collaborative Computing, Pervasive Computing, Future Internet, Internet of Things (IoT), Social Computing, Smart Space, Urban Computing