作者机构:[1]School of Mathematical Sciences, Dalian University of Technology, Dalian 116024, China, [2]Department of Mathematics, Dalian Maritime University, Dalian 116026, China
相关基金:Acknowledgments. This work was supported by the National Natural Science Foundation of China (Nos. U0935004,11071031,11071037,10801024), and the Fundamental Funds for the Central Universities. should be changed to Acknowledgments. This work is partly supported by the National Natural Science Foundation of China (Nos. U0935004,11071031,10801024), the Fundamental Funds for the Central Universities (DUT10ZD112, DUT11LK34), and National Engineering Research Center of Digital Life, Guangzhou 510006, China.