1. Guangdong Provincial Key Laboratory of Development and Education for Special Needs Children, Zhanjiang, Guangdong, China
2. Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, College of Electronic Information and Optical Engineering, Taiyuan University of Technology, Taiyuan, China
3. School of Electrical Information Engineering, Northeast Petroleum University, Daqing, China
4. School of Mechanical and Control Engineering, Guilin University of Technology, Guilin, China
5. School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin, China
6. College of Electrical and Mechanical Engineering, Lingnan Normal University, Zhanjiang, Guangdong, China