基金partly supported by the NSF(11271090,11171184,11001057)the Tianyuan Youth Fund of the NSF of China(11326083)+4 种基金Shanghai University Young Teacher Training Program(ZZSDJ12020)Innovation Progrom of Shanghai Municipal Education Commission(14YZ164)the NSF of Guangdong Province(S2012010010121)Projects13XKJ01 from the Leading Academic Discipline Project of Shanghai Dianji Universitythe Visiting Scholar Program of Department of Mathematics and Statistics at Curtin University of Technology