1. School of Electrical and Electronic Engineering, Shijiazhuang Tiedao University, Shijiazhuang, China
2. Department of Railway Transportation, Hebei Vocational College of Rail Transportation, Shijiazhuang, China
3. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, China
4. Department of Electrical Engineering, Shiraz University of Technology, Shiraz, Iran.