1. Postdoctoral Researcher, China Academy of Safety Science and Technology, Beijing Key Laboratory of Metro Fire and Passenger Transportation Safety, Beijing 100012, China.
2. Professorate Senior Engineer, China Academy of Safety Science and Technology, Beijing Key Laboratory of Metro Fire and Passenger Transportation Safety, Beijing 100012, China (corresponding author).
3. Research Engineer, Institute of Transportation Studies, Univ. of California at Berkeley, Berkeley, CA 94804.