作者机构:[1]Research Institute of Information Technology,Tsinghua National Laboratory for Information Science and Technology, Tsinghua University, Beijing 100084, China
相关基金:Supported by the National Natural Science Foundation of China (No. 60673145), the Basic Research Foundation of Tsinghua National Laboratory for Information Science and Technology (TNList), the lntel/University Sponsored Research, the National Key Basic Research and Development (973) Program of China (No. 2006CB303100), and the IBM China Research Laboratory