本文研究资讯检索正面和反面资讯需求

本文研究资讯检索正面和反面资讯需求

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1、國立臺灣大學「台大工程」學刊35第九十期民國九十三年二月第35–42頁BulletinoftheCollegeofEngineering,N.T.U.,No.90,February2004,pp.35–42ϒࢬ׶ͅࢬྤੈᅮՐ၆ྤੈᑭ৶ड़ਕ̝ᇆᜩEFFECTSOFPOSITIVEANDNEGATIVEINFORMATIONNEEDS*†ONINFORMATION฾ᇃځౘܫԓKuang-MingFeng*Hsin-HsiChen†RETRIEVAL*†碩士班研究生教授兼系主任*國立台灣大學資訊工程學研究所†國立台灣大學資訊工

2、程學系*†GraduatestudentProfessorandChairman*GraduateInstituteofComputerScienceandInformationEngineering,NationalTaiwanUniversity,Taipei,Taiwan10617,R.O.C.†DepartmentofComputerScienceandInformationEngineering,NationalTaiwanUniversity,Taipei,Taiwan10617,R.O.C.Abstract

3、Thepaperstudiespositiveandnegativeinformationၡࢋneedsininformationretrieval.Thenegativeinformationneedsareclassifiedintothreetypes.Threemethods,本文研究資訊檢索正面和反面資訊需求,我們把反面includingelimination,parametric,andre-ranking資訊需求分成三類,並提出三種方法,包括移除法、係數approaches,areproposed.NTCI

4、RChinesetestcollection法、和重新排序法。同時採用NTCIR中文測試集評估這三isusedforevaluation.Theexperimentalresultsshowthat種方法的效能,實驗顯示係數法對第1種型態的反面資訊parametricapproachiseffectiveforinformationneedsof需求有效,當以基本法處理第2種和第3種型態的反面資type1,andre-rankingapproachcanbeadoptedforinformationneedsoftype

5、s2and3whenthebaselineis訊的效能不好時,可採用重新排序法。poor.ᙯᔣෟĈ資訊檢索、反面資訊需求、效能評估。Keywords:informationretrieval,negativeinformationneed,performanceevaluation.1.ჰ>ኢ條件(ANSWERNOTNEAR(

6、netscape))自候選答案中挑出正確答案。使用者的資訊需求除了正面描述外,也包括反面查詢正反面描述之檢索包括兩個議題:查詢正反描述,表達不希望檢索出的文件的條件。大部分資訊面資訊的辨識,以及對

7、資訊檢索效能之影響。本文重檢索系統將查詢內的關鍵詞,都視為相關文件的正面點在於後者,我們採用NTCIR[2]資訊檢索測試集,描述,並用以計算與文件的相似度,因此檢索的準確對正、反面描述之辨識採用人工方式區分。本文之架性必然受到影響。構如下:第2節說明查詢之正反面資訊需求,並將反Bierner[1]分析英文alternativephrases,例如面資訊需求區分為三類;第3節介紹採用之資訊檢索「suchas…」、「otherthan…」等,以獲得正反面模型,以及測試用之文件集;第4節列出實驗結果;資訊,並轉換成檢索語言。以

8、下是個範例:第5節總結可能改進檢索效能之做法,以及可能之延WhataresomewebbrowsersotherthanNetscape?伸議題。查詢處理後的結果為:Whataresomewebbrowsers?:

9、:ANSWERNOTNEAR(

10、netscape)2.ϒͅࢬྤੈᅮՐ系統先找出符合查詢前半部分條件(Whataresomewebbrowsers?)的候選答案,再運用後半部分的額外NTCIR測試集[2]共有50個主題,主要欄位包36國立臺灣大學「台大工程」學刊第九十期民國九十三年二月括:相關含P之文件含N之文

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