Affiliation: | 1. School of Mathematics and Statistics, Nanjing University of Information Science and Technology, Nanjing 210044, China;2. College of Mathematics and Systems Science, Shandong University of Science and Technology, Qingdao 266590, China;3. Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044, China |