1. Robotics Research Centre of the School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore
2. Department of Electrical and Computer Engineering, Tamkang University, Taipei, Taiwan
3. Institute of Advanced Remanufacturing and Technolody Center (ARTC), Agency for Science, Technology and Research (A*STAR), Singapore
4. College of Information and Control Engineering, Xi'an University of Architecture and Technology, Xi'an, China