1. Ph.D. Student, College of Transportation Engineering, Dalian Maritime Univ., No. 1, Linghai Rd., Dalian 116026, China.
2. Professor, College of Transportation Engineering, Dalian Maritime Univ., No. 1, Linghai Rd., Dalian 116026, China; Professor, Center for Collaborative Innovation on Port Trading Cooperation and Development, Ningbo Univ., No. 818, Fenghua Rd., Ningbo 315211, China (corresponding author).