[1] Inha Univ, Sch Elect Engn, Inchon 402751, South Korea
[2] Virginia Polytech Inst & State Univ, Dept Elect & Comp Engn, Blacksburg, VA 24061 USA
[3] LS Ind Syst Co Ltd, New Business Team, Seoul 100753, South Korea
[4] Seoul Natl Univ, Sch Elect Engn & Comp Sci, Seoul 151742, South Korea