1. School of Finance, Nanjing Audit University, Jiangsu 211815, China
2. Jiangsu Key Laboratory of Financial Engineering, Nanjing Audit University, Jiangsu 211815, China
3. Department of Mathematics and Finance, Hanjiang Normal University, Hubei 442000, China
4. School of Engineering Management, Nanjing Audit University, Jiangsu 211815, China
5. College of Information Science and Technology, Donghua University, Shanghai 201620, China
6. College of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai 201621, China