1. School of Navigation and Shipping, Shandong Jiaotong University, Weihai 264209, China
2. College of Transport and Communications, Shanghai Maritime University, Shanghai 201306, China
3. Department of Basic Education, Shandong Jiaotong University, Weihai 264209, China
4. School of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, China
5. School of Business, Shandong Normal University, Jinan 250358, China