1. School of Automation, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, China
2. College of Intelligent Manufacturing, Yangzhou Polytechnic Institute, Yangzhou, Jiangsu, China
3. Department of Electronic Information Teaching, Guangzhou Information Technology Vocational School, Guangzhou, China
4. Department of Electronics and Informatics, Gunma University, Kiryu, Gunma, Japan