1. Department of Mechanical and Automation Engineering and T Stone Robotics Institute, Chinese University of Hong Kong, Shatin, Hong Kong
2. Thrust of Robotics and Autonomous Systems and the Thrust of Intelligent Transportation, Hong Kong University of Science and Technology (Guangzhou), Guangzhou, China
3. Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA, USA
4. State Key Laboratory of Internet of Things for Smart City (SKL-IOTSC), University of Macau, Macau, China