1. Shijiazhuang Tiedao University, Shijiazhuang, China
2. Shijiazhuang Hongye Traffic Construction Supervision Co., Ltd, Shijiazhuang, China
3. Shijiazhuang Railway Construction Co., LTD of China Railway Sixth Bureau Group, Shijiazhuang, China
4. Hebei College of Industry and Technology, Shijiazhuang, China