Funding for this research was provided by:
Innovative Research Group Project of the National Natural Science Foundation of China (81960618, 61773217)
Humanities and social sciences fund of the Ministry of Education (17YJC840015)
Hubei Key Laboratory of Applied Mathematics (AM201807)
Hunan Provincial Science and Technology Project Foundation (2019RS1033)
Development Funding from Yangtze University College of Technology and Engineerin (2019KY01,2020KY07)
Scientific Research Fund of Hunan Provincial Education Department (18A013)
Hubei Provincial Department of Education (B2020341)
Article History
Received: 29 May 2020
Accepted: 31 March 2021
First Online: 16 April 2021
Competing interests
: The authors declare that they have no competing interests.