Supported by Natural Science Foundation of China(11101245,61103119);Science Foundation of Shandong(BS2010SF017,ZR2011AQ005);Shandong Institute of Business and Technology Foundation(2011QN073)
supported by NSFSD(No.BS2010SF017,Y2008A04);NNSFC(No.11101245);Foundation of Education Committee of Shandong Province(J07YH03);Foundation of Shandong Institute of Business and Technology(2011QF073)