[1] Department of Electrical Engineering, Hankyong National University, 67, Seokjeong-dong, Anseong-city, Gyeonggi-do, 456-749, Korea, Republic of
[2] PDF Division, Samsung SDI Co., LTD., 508 Sungsung-dong, Ceonan-city, Chungnam-do, 330-300, Korea, Republic of
[3] School of Electrical Engineering, College of Engineering, Seoul National University, Kwanak-ku, Seoul, 151-744, Korea, Republic of