About the Authors

Shanshan Wang

Roles Formal analysis, Methodology, Supervision, Writing – original draft

ustc_wangshanshan@126.com

Affiliation School of Economics and Management, Yan’an University, Yan’an, China

Kunyuan Zhang

Roles Data curation, Formal analysis, Methodology, Writing – original draft

Affiliation College of Computer Science, Inner Mongolia University, Hohhot, China

Ao Liu

Roles Writing – review & editing

Affiliation School of Mathematics and Computer Science, Yan’an University, Yan’an, China

Competing Interests

The authors have declared that no competing interests exist.