1. College of Electronic and Information Engineering, Hebei University, Baoding, China
2. School of Automation, Southeast University, Nanjing, China
3. School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology, Stockholm, Sweden
4. Department of Electrical Engineering, Universidad de Talca, Curico, Chile
5. Faculty of Engineering, Universidad San Sebastian, Santiago, Chile
6. School of Electrical Engineering, Dalian University of Technology, Dalian, China