1. School of Electrical Engineering and Automation, Luoyang Institute of Science and Technology, Luoyang, China
2. Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada
3. School of Electro-Mechanical Engineering, Xidian University, Xi'an, China
4. Department of Computer Science and Engineering, University of Bologna, Bologna, Italy
5. Institute of Systems Engineering, Macau University of Science and Technology, Macau, China