Funding for this research was provided by:
National Key R&D Program of China (2017YFB0802000)
National Natural Science Foundation of China (61772418, 61472472)
National Natural Science Foundation of China (61402366)
Natural Science Basic Research Plan in Shaanxi Province of China (2015JQ6236)
New Star Team of Xi’an University of Posts and Telecommunications (2016-02)
Article History
Received: 12 June 2018
Accepted: 3 December 2018
First Online: 14 December 2018