作者机构:[1]Department of Applied Mathematics, Northwest Polytechnical University, Shaanxi 710072, P. R. China, [2]School of Statistics, Xi'an University of Finance & Economics, Shaanxi 710061, P. R. China, [3]National Key Laboratory of Pattern Recognition, Institute of Automation, Chinese Academy of Sciences, Beijing 100080, P. R. China
相关基金:Supported by the National Natural Science Foundation of China (Grant Nos. 60375003; 60972150) and the Science and Technology Innovation Foundation of Northwestern Polytechnical University (Grant No. 2007KJ01033).