4Voorhees E.Overview of the TREC 2003 Question Answering Track[C].Proceeding of the 11^th Text Retrieval Conference,Gaithersburg:NIST,2003:1-15.
5Voorhees E,Tice D.The TREC-8 Question Answering Track Evaluation[C].Proceedings the Eighth Text Retrieval Conference,NIST,2000:83-105.
6Zhang Dell,Wee Sun Lee.Question Classification Using Support Vector Machines[C].Proceedings of the 26^th ACM SIGIR.ACM Press,2003.
7Li Xin,Roth D,Small K.The Role of Semantic Information in Learning Question Classifiers[C].Proceedings of the 1^st International Joint Conference on Natural Language Processing,2004:451-457.
8Chang Chihchung,Lin Chihjen.LIBSVM:A Library for Support Vector Machines[Z].《http://www.csie.ntu.edu.tw/～cjlin/libsvm》,2001.
9Yu Zhengtao,Fan Xiaozhong,Son Lizhe,et al.Chinese Question Classification Combining Syntactic and Semantic Feature[C].Proceedings of the 6^th Internation Symposium on Test and Measurement.Dalian:International Academic Publishers,2005.
10Wu Lide,Huang Xuanjing,Guo Y,et al.FDU at TREC-9:CLIR,Filtering and QA Tasks[C].Proceedings of the 9th Text Retrieval Conferernce,2001:189-203.
4YOU C H, KOH S N, RAHARDJA S. An invertible frequency eigendomain transformation for masking - based subspace speech enhancement [ J ]. IEEE Signal Processing Letters ,2005,12 ( 6 ) :461 - 464.
