1. Institute of Rail Transit, National Maglev Transportation Engineering R&D Center, Tongji University, Shanghai, China
2. Logistics Engineering College, Shanghai Maritime University, Shanghai, China
3. Department of Energy Electrical Engineering, Graduate School, Woosuk University, Jincheon-gun, South Korea
4. Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu, China
5. Business School, Worcester Polytechnic Institute, Worcester, MA, USA