Funding for this research was provided by:
Innovation Project of Guangxi Graduate Education (YCSW2019150)
GUET Excellent Graduate Thesis Program (18YJPYSS32)
Guangxi Key Laboratory of Information Materials (171002-Z)
Article History
Received: 9 March 2020
Accepted: 5 June 2020
First Online: 24 June 2020
Compliance with ethical standards
:
: The authors declare no conflict of interest.