Information Retrieval Transfer CycleInformation Retrieval SystemInterlinked EntitiesIR Information TransferThe IR CycleSlide 6Slide 7Slide 8Slide 9Slide 10Slide 11User JudgmentDocument-Based IRsSlide 14Slide 15Information SeekingDiscussionSearch Logic OverviewInformation Retrieval Transfer CycleDania BilalIS 530Fall 2007Information Retrieval SystemA set of components that interact to provide feedbackComprised of interlinked entitiesAgency that creates the databasesPeopleDocumentsInterlinked EntitiesAgencyDocumentsPeopleIR Information TransferInputsProcessesObjectives of the SystemOutputsThe IR CycleDocuments are analyzed, translated, indexed, and stored.Documents are organizedCataloging (description/representation of docs.)Subject indexingThe IR CycleSubject indexinga) Determination of subject content (conceptual analysis)b) Translation of content into language of the system (controlled vocabulary)c) AbstractingThe IR CycleLanguage of the system (controlled vocabulary)List of subject headings (Pre-coordinate)Thesauri (Pre-coordinate)Classification schemeThe IR CycleDocuments are represented by other entitiesAuthor(s)Date of publicationLanguageIdentifiersEntities may become access pointsThe IR CycleDocuments are stored after indexingDocument representation is entered into the matching mechanismA file of document surrogates is establishedFile becomes available for searching using a variety of entities/access pointsThe IR CycleUser QueryAnalyzed for conceptual contentTranslated into the language of the system (matched against controlled vocabulary and keywords)Matched against document surrogates in the databaseThe IR CycleOutputA set of records found and deemed relevant to a user queryUser judgment of retrievalUser JudgmentRelevance to information needRelevance ranking by IR systemRelevance vs. pertinenceDocument-Based IRsInput, output, and matching mechanismsSelection of documents (done by indexers)Analysis of documents (done by indexers)Document organization and representation (done by indexers)Document-Based IRsAnalysis of user query (done by system)Match of user query with relevant documentsDelivery of documents (output)The IR CycleInformation SeekingProcess of finding information to fill a knowledge gapUser requestsKnown item searchesUnknown item searches Subject searchesDiscussion How does the IR transfer cycle in databases varies from the cycle in Web search engines?Search Logic OverviewBoolean logicSearch parametersPhraseProximityUse of specific fields to
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