1. Virtual Engineering Lab., Korea University of Science and Technology, 52 Eoeun-dong Yuseong-gu, Daejeon, 305-333, Korea
2. Railway System and Safety Research Team, Korea Railroad Research Institute, 374-1 Woram-dong Uiwang-si, Gyeonggi-do, 437-050, Korea
3. Department of Rolling Stock System, Seoul National University of Technology, 172 Gongreung 2-dong Nowon-gu, Seoul, 139-743, Korea