1. School of Internet and Communication, Anhui Technical College of Mechanical and Electrical Engineering, Wuhu, China
2. State Gride Wuhu Power Supply Company, Wuhu, China
3. School of Instrument Science and Opto-Electronics Engineering, Hefei University of Technology, Hefei, China
4. School of Mechanical Engineering, Anhui Technical College of Mechanical and Electrical Engineering, Wuhu, China