1. Robotics Engineering, Columbus State University,Columbus,Georgia,USA
2. The Hong Kong Polytechnic University,Department of Mechanical Engineering,Hong Kong,China
3. Lassonde School of Engineering, York University,Toronto,Canada
4. School of Electrical Engineering, Hanyang University,Ansan-si,South Korea
5. Intelligent Robotics Research Center, Zhejiang Lab,Hangzhou,China
6. School of Mechanical Engineering, North China University of Water Resources and Electric Power,Zhengzhou,China