作者机构:[1]College of Computer and Information Engineering, Beijing Technology and Business University, Beijing 100048, P. R. China, [2]Department of Mathematics, Suzhou University, Jiangsu 215006, P. R. China
相关基金:Supported by the National Natural Science Foundation of China (Grant No. 10871032), Innovation Project for the Development of Science and Technology (IHLB) (Grant No. 201098) and the Specific Research Fund of the Doctoral Program of Higher Education of China (Grant No. 20060285002).