1. Lecturer, School of Information Science and Engineering, Wuhan Univ. of Science and Technology, Wuhan 430081, China; and State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China (corresponding author).
2. Professor, State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China.
3. Assistant Professor, School of Information Science and Engineering, Wuhan Univ. of Science and Technology, Wuhan 430081, China.
4. Ph.D. Candidate, Dept. of Electrical and Computer Engineering, Univ. of Texas at El Paso, El Paso, TX 79968.