May 2011 in his office at SNU
December 1999 in his office at KAIST
October 1997 in his office at NJIT
August 1993 in his office at UIUC
May 2011 in his office at SNU
December 1999 in his office at KAIST
October 1997 in his office at NJIT
August 1993 in his office at UIUC