1. Department of Mathematics, School of Sciences, Nanchang University, Nanchang, P.R. China
2. Department of Mathematics, School of Sciences, Nanchang University, Nanchang, P.R. China + Numerical Simulation and High-Performance Computing Laboratory, School of Sciences, Nanchang University, Nanchang, P.R. China
3. School of Software Engineering, Shenzhen Institute of Information Technology, Shenzhen, P. R. China