1. College of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin, China
2. Commercial Vehicle Technology Center, Dongfeng Liuzhou Automobile Company Ltd., Liuzhou, China
3. College of Computer Science and Software, Zhaoqing University, Zhaoqing, China
4. Department of Computer Science, State University of New York at New Paltz, New Paltz, NY, USA