1. Key Laboratory of Road and Traffic Engineering, Ministry of Education, Tongji University, Shanghai, People's Republic of China
2. School of Mathematical Sciences, Anhui University, Hefei, Anhui, People's Republic of China
3. School of Mathematical Sciences, East China Normal University, Shanghai, People's Republic of China
4. Shanghai Key Laboratory of PMMP, East China Normal University, Shanghai, People's Republic of China
5. Key Laboratory of MEA, Ministry of Education, Shanghai, People's Republic of China
6. Division of Applied Mathematics, Brown University, Providence, RI USA
7. Department of Civil Engineering, The University of Hong Kong, Hong Kong, People's Republic of China