基金"Shu Guang"project(04SG27)supported by the Shanghai Municipal Education CommissionShanghai Education Development Foundation and the National Natural Science Foundation of China(70271001).
基金The National Natural Science Foundation of China(No.11001052,11171065)the National Science Foundation of Jiangsu Province(No.BK2011058)the Science Foundation of Nanjing University of Posts and Telecommunications(No.JG00710JX57)