1. School of Statistics and Data Science, Qufu Normal University, Qufu, Shandong 273165, China
2. Key Lab of Mine Disaster Prevention and Control, School of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China
3. School of Energy and Safety Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China