Funding for this research was provided by:
National Natural Science Foundation of China (71573124)
The Key Project of Philosophy and Social Science Research in Colleges and Universities in Jiangsu Province (2018SJZDA036)
The Project of Social Science Research in Jiangsu Province (18EYB015)
Short-term visiting program for doctoral students of Nanjing University of Aeronautics and Astronautics (181001DF09)
Article History
Received: 3 February 2019
First Online: 8 October 2019