Chen, Ting
Guo, Xiao
Jia, Ji
Xiao, Jinghua
Funding for this research was provided by:
National Natural Science Foundation of China (11375033, 11775034)
National College Innovation Program of Beijing University of Posts and Telecommunications
Article History
Received: 6 December 2017
Accepted: 9 November 2018
First Online: 23 January 2019
Competing Interests
: The authors declare no competing interests.