1. Center for Robotics, School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu, China
2. Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island, Kingston, RI, USA
3. Department of Electrical, Computer and Biomedical Engineering, University of Rhode Island, Kingston, RI, USA
4. Graduate School of Oceanography, University of Rhode Island, Narragansett, RI, USA