1. Dalian Maritime University, DaLian, China, 116026 Centre for Maritime Studies, National University of Singapore, 118411, Singapore
2. School of Traffic and Transportation, Beijing Jiaotong University, Beijing 100044, China
3. MOE Key Laboratory for Urban Transportation Complex Systems Theory and Technology, Beijing Jiaotong University, Beijing 100044, China
4. Logistics Engineering College, Shanghai Maritime University, Shanghai 201306, China