School of Traffic and Transport Engineering,Central South University,Changsha 410075,China;
State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University,Beijing 100044,China;
School of Traffic and Transport Engineering,Central South University,Changsha 410075,China;
School of Mathematics Statistics,Wuhan University,Wuhan 430072,China;
School of Mathematics and Computational Science,GuiJin University of Electronic Technology,Guilin 541004,China;
