1. Department of Automation, School of Information Science and Technology, University of Science and Technology of China, Hefei, P.R. China
2. Institute of Intelligent Manufacturing Technology, Jiangsu Industrial Technology Research Institute, Nanjing, P.R. China
3. Southwest University of Science and Technology, Mianyang, P.R. China
4. Institute of Advanced Manufacturing Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Changzhou, P.R. China