1. Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan
2. Graduate Institute of Automation Technology, National Taipei University of Technology, Taipei, Taiwan
3. Department of Mechanical Engineering and Intelligent Systems, The University of Electro-Communications, Tokyo, Japan
4. Department of Electrical Engineering, Yuan Ze University, Taoyuan City, Taiwan
5. Department of Engineering, King’s College London, London, U.K.