1. College of Electrical and Control Engineering, North University of China,Taiyuan,China,030051
2. College of Computer Science and Technology, North University of China,Taiyuan,China,030051
3. College of Environment and Safety Engineering, North University of China,Taiyuan,China,030051
4. College of Environment and Resources, Taiyuan University of Science and Technology,Taiyuan,China,030024