1. City University of Hong Kong,Department of Electrical Engineering,Kowloon Tong,Hong Kong
2. Wuhan University of Technology,School of Automation,Wuhan,China,430070
3. RMIT University,Manufacturing, Materials and Mechatronics Engineering,Melbourne,VIC,Australia,3000
4. The Hong Kong Polytechnic University,Department of Electrical Engineering,Hung Hom,Hong Kong