1. Department of Mathematics and Applied Mathematics, Reading Academy, Nanjing University of Information, Science and Technology, Nanjing 210044, P. R. China
2. School of Mathematics and Statistics, Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China
3. Economic Operation Department, China National Tobacco Corporation, Beijing 100045, P. R. China
4. Center for Applied Mathematics of Jiangsu Province, Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China
5. Jiangsu International Joint Laboratory on System Modeling and Data Analysis Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China