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Ph.D. (Astronomy), University of Texas at Austin, USA, 1988
M.A. (Astronomy), University of Texas at Austin, USA, 1985
B.S. (Astronomy), Seoul National University, Korea, 1983
Professor, Chungnam National University, Korea, 2002-present
Visiting Professor, University of Minnesota, USA, 2002-2003
Associate Professor, Chungnam National University, Korea, 1997-2002
Visiting Professor, University of Washington, USA, 1996-1997
Assistant Professor, Chungnam National University, Korea, 1992-1997
Postdoctoral Researcher, Princeton University, USA, 1990-1992
Postdoctoral Researcher, Astrophysics Group, Fermilab, USA, 1988-1990
Astrophysical Fluids and Plasmas Astrophysics
Cosmic Ray Astrophysics
Large Scale Structure of the Universe