Funding for this research was provided by:
National Natural Science Foundation of China (71173177)
State Railway Administration Science and Technology Project (KF2014-041)
Southwest Jiaotong University 2015 Graduate Innovative Experimental Practice Program (YC201507103)
Southwest Jiaotong University 2018 Postgraduate Academic Literacy Improvement Plan (2018KXK04)
Article History
Accepted: 4 September 2020
First Online: 13 October 2020