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ID:36423184
大小:6.44 MB
页数:152页
时间:2019-05-10
《基于语义处理技术的信息检索模型研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、浙江大学计算机学院博士学位论文基于语义处理技术的信息检索模型研究姓名:王瑞琴申请学位级别:博士专业:计算机科学与技术指导教师:孔繁胜20090401浙江人学博士学位论文摘要优先返回与查询语义相关性强的文档供用户浏览。4.本文对如何满足不同用户的个性化查询需求进行了研究,提出了一种语义加强的个性化信息推荐方法。该方法综合利用语义数据源和历史评分数据进行混合推荐,语义数据源的引入解决了传统协同过滤系统的数据稀疏性和冷启动问题。另外,为了提高推荐系统的可扩展性和实时性,在数据的离线预处理阶段,本文使用数据挖掘方法对用户和项目进行了模糊聚类。关键字:信息检
2、索,语义关联,隐式反馈,词义消歧,查询扩展,语义相关性,查询优化,聚类,个性化推荐浙江大学搏上学位论文AbstractWeareinaninformationagethatmainlycharacterizedbyinformationexplosion,andinformationretrievaltechniquesarenowchallengedalotbymorefrequentInteractinformationupdating,aswellasincreasinguserdemandformoreprecisesearchresult
3、s.Semanticsearchtechnique,fortunately,isahopefulwaythatleadstothekeytotheissueoffindingexactinformationfrommassnumberofthemeffectively.However,asaresultoftheincompleterealizationofsemanticwebtechnique,recentstudyhasbeenmorefocusedonsemanticretrievaltechniqueintransitionperiod,
4、makingitahottopicofresearch.SeveralkeyproblemsinInformationRetrieval(IR)domainareaddressedandanovelSemanticProcessingTechnologybasedInformationRetrieval(SPTIR)modelisproposedinthisdissertation.SPTIRisanextensiononQueryExpansion(QE)andSearchResultre-Ranking,whichconsistsoffourp
5、arts,namelysemanticqueryexpansionbasedonWordSenseDisambiguation(WSD),queryoptimizationbasedonwordsemanticrelatedness,searchresultsre—rankingbasedondocumentsemanticrelevance,andsemanticenhancedpersonalizedinformationrecommendation.Firstly,inthecontextofkeyword-basedsearchengine
6、,awell—structuredandgood-meaningfuluserquerynotonlyexpressesL1ser’spersonalneedsprecisely,butalsoguaranteestheQS(QualityofService)requirementforinformationretrieval.Startingwiththeissueofsemanticassociationsofquerykeywords,supplementedbyimplicitfeedbacktechnique,andusingunsupe
7、rvisedWordSenseDisambiguation,thisdissertationpresentsatechniquethatmapsquerykeywordstoontologyconcepts,andasemanticqueryexpansiontechniquebasedonconcept—wordassociation.TheWSDbasedsemanticqueryexpansionsolvestheproblemofnotwellunderstandinguser’Squeryintensionintraditionalret
8、rievalsystems.Secondly,forthosequerykeywordsthatfailtodisambi
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