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ID:36353017
大小:3.40 MB
页数:99页
时间:2019-05-09
《基于本体的WEB信息集成若干关键技术研究》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、复旦大学博士学位论文基于本体的Web信息集成若干关键技术研究姓名:张凯申请学位级别:博士专业:计算机软件与理论指导教师:胡运发20040420摘要建立索引和使用叶序区间判断SF-Condition(半柔性条件1是否满足实现本体上的半柔性查询求解。同传统的深度优先遍历方法相比,理论分析和实验都证明该求解方法具有一定优越性。5.根据所研究的关键技术和实际项目中的应用需求,提出了一个使用MBH方法的Web信息集成体系结构,并基于该体系结构开发了一个基于本体的Web信息集成原型系统,该原型系统具有本体管理、Web信息抽取、查询重写
2、等功能,具有一定的实用价值。关键词:本体,MBH方法,中间层本体,概念格,多视点,柔性查询,查询重写复旦大学博士学位论文第ii页ABST队CTABSTRACTWeboffersanabundantandvaluableinformationrepository.Soitisallimportantandmeaningsubjecttoresearchhowdiscoveryandobtainvaluableinformationin%6repository.nedataofW曲hascharacteristicssucha
3、ssemistructured,heterogeneous,distributedetc.ThesecharacteristicsmaketheinformationintegrationonW曲achallengingwork.AimatMediatorBasedHybrid(MB哟approachsmainly,thethesisaddressesseveralkeytechnicalproblemsofontology-based骺6informationintegration.whichcoversontology
4、conceptsextractingfromobjectssetbasedonFCA,informationextractingfromW曲table,mediatorontologyconstructinginMBH,flexiblequeriesoverontology,queryrewritinginMBH.Majorcontributionsofthisthesisinclude:1.AnIRST-basedalgorithmisproposedforconstructionofconceptlatticestoe
5、levatetheperformanceofconceptsextractingfromobjectssct.ThealgorithmfirstusestheInter-RelevantSuccessiveTreesmodeltotransformformalcontext,thenextractconceptsfromformalcontextbytechnologiesoffindingfrequentitemsetsinDataMining.Intheextractingprocedure,thealgodttmaa
6、voidsgenerationoflotsofcandidateattributessets.Comparedwithsomeotheralgorithmforconstructionofconceptlattices.complexityanalysisandexperimentillustratethatthealgorithmwg:proposedismoreefficient.2.AimatChineseinformation,aregularexpressionsbased,Webtablborientedinf
7、ormationextractingmethodisproposed.InordertoextractChineseinformationfromWebtables,weanalysethecharacteristicsofChinesephrasewhichexpressesconceptinontology,generalizeakindofdialectpatternusingregularexpressionsfromphrasesetwhichexpressesthesameconcept.Weusethedia
8、lectpatternmatchingtocompletemappingfromWebinformationtoconceptinontologyanddesignstrategytoresolvematchingconflictatthesametime.Experimentillustratetha
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