Astrophysics, High Energy Cosmic Rays, Stable Isotopes,
Cosmology, Big Bang Nucleosynthesis, Satellite Payload,
Observation of Cosmic Ray and Antimatter by Balloon,
Satellite and International Space Station, Radio
Observation, Applied Physics

1980~ Member of Meteoritical Society
1981~1984 California Inst. of Technology, Research Fellow
1982~ Member of American Physical Society
1984~1985 California Inst. of Technology, Senior
Scientist
1985~ Professor of Ewha Womans University, Dept. of
Physics
1986~ Fellow, Div. Chairman of Korean Physical
Society
1989~ Fellow, Auditor of Korean Space Science Society
1990~ Member of Korean Astronomical Society
1990~1991 California Inst. of Technology, Visiting
Associate
1990~1992 Chairman of Ewha Womans University, Dept. of
Physics
1993~1996 Director of Ewha Womans Univ., Research Inst.
for Basic Sciences
1997~1998 California Inst. of Technology, Visitor
1998~2003 Geochemical Journal, Associate Editor
2000~ Member of International Astronomical Union
2001~2003 Dean of Ewha Womans University, College of
Natural Sciences
2002~2005 Member of IUPAP Commission 19(Astrophysics)
2004~2004 ETH Zurich, Switzerland LHP, Visiting
Professor