High-speed spindle, Magnetic bearing. Enginw Iubrication, Rotor dynamics Damper, Ceash, Micro-Biomechanics

1969~1972 Dept. of Mechanics. Hyundai-Construction Co.
1971~1972 Administrator Level 3, KDI
1973~1975 Graduate Research Assistant, Univ. of Karlsruhe. Germany
1976~1982 Research Professor, Seoul National University
1982~ A life member of The KSME
1985~ A life member of KSTLE
1986~1991 Associate Professor, Seoul National University
1991~ Professor, Seoul National University
1991~1994 Head of Dept. of Mechanical Design & Production Entg..SNU
1996~1999 Chief of Engineering Research Center. SNU
1997~ A Life member of the KSAE

1991 KSME Award, KSME
1992 The Prize for Science and Technology paper, KOFST
1998 KSAE Award, KSAE