基金supported by National Science Foundation of China(under grant:10671126)Shanghai leading academic discipline project(under grant:S30501)+2 种基金the Innovation Fund Project for Graduate Student of Shanghai(JWCXSL1001)Youth Foundation of Henan Polytechnic University(Q2009-3)Applied Mathematics Provincial-level Key Discipline of Henan Province,Operations Research and Control Theory Key Discipline of Henan Polytechnic Univrsity