1. Key Laboratory for Robot and Intelligent Technology of Shandong Province, Shandong University of Science and Technology, Qingdao, China
2. College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao, China
3. College of Mathematics and Systems Science, Shandong University of Science and Technology, Qingdao, China
4. College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao, China