Affiliation: | 1.School of Science, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China ;2.Department of Mathematics, Nanjing University, Nanjing, 210093, China ;3.College of Shipbuilding Engineering, Harbin Engineering University, Harbin, 150001, China ;4.Division of Applied Mathematics, Brown University, Providence, RI, 02912, USA ; |