1. School of Mechanical and Electrical Engineering, Soochow University,Suzhou,P. R. China,215137
2. Jiangnan University,Key Laboratory of Advanced Process Control for Light Industry of Ministry of Education,Wuxi,P. R. China,214122
3. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology,Shanghai,P. R. China,200093
4. Shanghai Jiao Tong University,Department of Automation,Shanghai,China,200240