1. School of Traffic &Transportation, Chongqing Jiaotong University, Chongqing, China
2. Department of Science and Technology Statistics and Innovation Development, Chongqing Productivity Council, Chongqing, China
3. Technology R & D Department, Chongqing Ulit Science & Technology Co. Ltd, Chongqing, China
4. Energy Conservation and Environmental Protection Technology, China Railway Changjiang Transport Design Group Co. Ltd, Chongqing, China