present    Professor, School of Electrical Engineering and Computer Science,Seoul National University
present    Director, Seoul National University- Samsung Techwin Cooperation Reserarch Center
present    Finance Committee Member, Seoul National University
present    Funding Committee Member, Advanced Institutes of Convergence Technology, SNU
present    Working Committee Member, Technology Incubation Network, Seoul National University
present    Chairman, External Cooperation Committee, Department of Electrical Engineering, SNU
1998 ~ 1999    Assistant Professor, University of California, Riverside, U.S.A.
1984 ~ 1994    Researcher, Electronics and Telecommunications Research Institute
2004 ~ 2008    Planning Committee Member, Engineering of Seoul National University
2008    Secretary General, World Congress 2008 , International Federation of Automatic Control
2008    Vice President , Korean Institute of Intelligent Systems
2004 ~ 2005    Planning Director, College of Engineering, Seoul National University
2001    Member of the vision committee,Ministry of Information and Communication
2006    Director of Infrastructure composition, Robots Industry Forum, Ministry of Commerce, Industry and Energy
2003 ~ 2006    Associate Editor, International Journal of System Science
2003 ~ 2007    Editor, Interantional Journal of Control, Automation, and Systems
2004 ~ 2007    Director, Korea Fuzzy Logic and Intelligent System Society (KFIS)
2004 ~ present    Director, Information & Controls, Korean Institute of Electrical Engineers (KIEE)
2002 ~ present    Director, Institue of Electronics Engineers of Korea
2001 ~ 2004    Director, Korean Brain Society
2000 ~ 2005    Editor, Institute of Control, Robotics and Systems
2002 ~ 2006    Director, Institute of Control, Automation, and Systems Engineering (ICASE)
2000 ~ 2001    Program Committee, Congress on Evolutionary Computation (CEC)
2004    Organizing Committee, International Conference on Control, Automation, Systems
2001    Organizing Committee, IEEE International Conference on Robotics and Automation (ICRA)