1. School of Transportation, Southeast University, 2 Southeast University Rd., Nanjing, Jiangsu 211189, P.R. China
2. School of Transportation, Southeast University, 2 Southeast University Rd., Nanjing, Jiangsu 211189, P.R. China (Corresponding author), e-mail: yangjun@seu.edu.cn, https://orcid.org/0000-0001-8407-8427
3. School of Science, Nanjing University of Science and Technology, 200 Xiaolingwei, Nanjing, Jiangsu 210094, P.R. China