Micro local analysis of partial differential equations,
Special functions, Approximation theory

1976~1978 Assistant, Dept. of Mathematics, Seoul National
University
1978~1983 Teaching Assistants, Dept. of Mathematics,
Rutgers University
1983~1985 Assistant Professor, Dept. of Mathematics, Univ.
of Oklahoma
1985~1989 Assistant Professor, Dept. of Applied
Mathematics, KAIST
1992~1993 Visiting Associate Professor, Department of Math.
& Stat., Utah State University
1989~1994 Associate Professor, Dept. of Mathematics, KAIST
1994~ Professor, Division of Applied Mathematics, KAIST

1994 Best Research award from KAIST
1999 Research award from Korean Math. Society
2000 Award for promotion of Science and Technology
from Taejon city