1. College of Automation, Nanjing University of Information Science and Technology, Nanjing, People's Republic of China
2. College of Automation, Chongqing University, Chongqing, People's Republic of China
3. School of Electrical and Electronic Engineering, The University of Adelaide, Adelaide, SA, Australia
4. School of Information Science and Technology, Fujian University of Technology, Fuzhou, People's Republic of China