He was a postdoctoral researcher in INRIA Rhone-Alpes, France in 2006, and a visiting scientist in Fraunhofer Institute (FIRST) in Berlin, Germany in 2004. He received the B.Eng. in Computer Science and Mechanical Engineering from Inha University, Korea in 1999. He received M.S. and Ph.D. degrees in Computer and Information Engineering from Inha University, Korea in 2002 and 2005, respectively.