Study on the decision algorithm for visibility in geometric
objects and visibility-based path planning, Study on the
design and development of a high-performance parallel
computer, Study on the online navigation in an unknown
environment and the characteristics of dynamic computation

1980~ Professor, Computer science department, KAIST
1985~1986 Visiting Scientist, IBM T.J. Watson Research Center
1997~1998 President, Korea Information Science Society
1991~2002 Editor, Theoretical Computer Science
1998 ProgramCommittee Co-Chair, ISAAC
2002~ Editor, Int. J. of Foundations of Computer Science
2000~ Asia Regional Contest Director, ACM ICPC
2000~2003 International Scientific Committee member, IOI
2002 Scientific Committee Chair, The 14th IOI, Korea, 2002.
2003~ Dean, School of Engineering, KAIST

1989 Korea Information Science Society Academy Award