1. School of Automation, Guangdong-Hong Kong Joint Laboratory for Intelligent Decision and Cooperative Control, and Guangdong Provincial Key Laboratory for Intelligent Decision and Cooperative Control, Guangdong University of Technology, Guangzhou, People's Republic of China
2. College of Electronic and Information Engineering and Chongqing Key Laboratory of Generic Technology and System of Service Robots, Southwest University, Chongqing, People's Republic of China