1. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China
2. School of Modern Posts and Institute of Modern Posts, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
3. School of Air Transportation, Shanghai University of Engineering Science, Shanghai 201620, China
4. College of Automobile and Traffic Engineering, Nanjing Forestry University, Nanjing 210037, China