1. Hubei Key Laboratory of Advanced Technology of Automotive Parts, Wuhan University of Technology, Wuhan, People's Republic of China
2. Fujian Engineering Research Center of Motor Control and System Optimal Schedule (Huaqiao University), Xiamen, People's Republic of China
3. School of Computer Science, Tokyo University of Technology, Hachioji, Japan
4. Department of Electronics and Information Systems, Akita Prefectural University, Akita, Japan