He received a B.S. degree and an M.S. degree from the University of Hanyang in 1982 and 1984, respectively. He was affiliated with KERI as a researcher from 1984 to 1989; a senior researcher from 1989 to 1996; and a team leader of advanced distribution systems and custom power lab from 1997 to 1998. He obtained a Ph.D. from Kyoto University, Japan, in 1996. He has been a Professor at Chungbuk National University since 1998. His current interests are the analysis of power quality and the operation and design of AC and DC power distribution systems with distributed generation and advanced distribution systems, such as micro-grids or smart grids.