1. Advanced Batteries Research Center, Korea Electronics Technology Institute (KETI), 68 Yatap-dong, Bundang-gu, Seongnam-si, Gyeonggi-do 463-816, South Korea
2. Power Control Device Research Team, Electronics and Telecommunications Research Institute (ETRI), 218, Gajeongno, Yuseong-gu,
Daejeon, 305-700, South Korea