1. Division of Applied and Computational Mathematics, Beijing Computational Science Research Center, Beijing 100193, China
2. School of Mathematics and Statistics, Huizhou University, Guangdong, Huizhou 516007, China
3. School of Electronic and Information Engineering, Huizhou University, Guangdong, Huizhou 516007, China
4. Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China