National Natural Science Foundation of China(20833002,20903057,51172110);Research Fund for the Doctoral Program of Higher Education of China(20093223120002);Natural Science Foundation of Jiangsu Province(BK2010525,BK2011750);Foundation of Jiangsu Educational Committee(09KJB150007,08KJB150011);Scientific Research Foundation of Nanjing University of Posts and Telecommunications(NY208046,NY208025,NY208026)~~