作者机构:[1]Research Center for Information Retrieval, School of Computer Science and Technology, Harbin Institute of Technology, Harbin 150001, China, [2]School of Electrical and Information Engineering, Harbin Institute of Technology, Harbin 150001, China
相关基金:Supported by the National Natural Science Foundation of China (Nos. 60975055 and 60803093) and the National High-Tech Research and Development (863) Program of China (No. 2008AA01Z144)