基金the Natural Science Foundation of China(Grant No.10471159,No.10171118)the key project of the Chinese Ministry of Education,Supported by Program for New Century Excellent Talents in University,Education Commission project Research Foundation of Chongqing(Grant No.K J060818,KJ060804)+1 种基金the Research Fund for the Doctoral Program of Chongqing Normal University(Grant No.06XLB023)the project supported by Chongqing Key Laboratory of Operations Research and System Engineering.
