Funding for this research was provided by:
Scientific Research Plan Projects of Shaanxi Education Department (17JK0711)
International Science and Technology Cooperation Program (2018KW-049)
Ministry of Communication and Information Technology (2019-R-29)
International Science and Technology Cooperation Program (2019KW-008)
Scientific Research Plan Projects of Shaanxi Education Department (19JK0806)
Graduate Innovation Fund of Xi’an University of Posts and Telecommunications (CXJJLY2019071)
Shaanxi Provincial Science and Technology Department (2019ZDLGY07-08)
Article History
First Online: 15 July 2020
Compliance with ethical standards
:
: We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.