1. School of Information and Electrical Engineering, Ludong University, Yantai, People's Republic of China
2. College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao, People's Republic of China
3. School of Information and Control Engineering, Weifang University, Weifang, People's Republic of China
4. Economic and Information Bureau of Linqu, Weifang, People's Republic of China
5. Environmental Monitoring Centre of Weifang, Weifang, People's Republic of China