云计算与大数据工程技术研发中心汇报

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1、ApproachesforSourceRetrievalandTextAlignmentofPlagiarismDetectionKongLeilei,QiHaoliang,DuCuixia,WangMingxing,HanZhongyuanPAN@CLEF2013www.hljit.edu.cn1Whoarewe?2Whoarewe?2Whoarewe?2Whoarewe?HeilongjiangInstituteofTechnologyHarbin,HeilongjiangProvince,China2OurUniversityPAN@CLEF2013

2、HeilongjiangInstituteofTechnology,KongLeilei3OurUniversityPAN@CLEF2013HeilongjiangInstituteofTechnology,KongLeilei3OurUniversityPAN@CLEF2013HeilongjiangInstituteofTechnology,KongLeilei3OurUniversityPAN@CLEF2013HeilongjiangInstituteofTechnology,KongLeilei3OurUniversityPAN@CLEF2013H

3、eilongjiangInstituteofTechnology,KongLeilei3OurUniversityPAN@CLEF2013HeilongjiangInstituteofTechnology,KongLeilei3IndexApproachesforSourceRetrievalApproachesforTextAlignmentFurtherworksPAN@CLEF2013HeilongjiangInstituteofTechnology,KongLeilei4SourceRetrievalQuerySuspiciouskeywor

4、dsdocumentSourceTextCandidateRetrievalAlignmentDocumentsSuspiciousplagiarismInternettextDocumentResourceSetPAN@CLEF2013HeilongjiangInstituteofTechnology,KongLeilei13SourceRetrievalQuerySuspiciouskeywordsdocumentSourceTextCandidateRetrievalAlignmentDocumentsSuspiciousplagiarismInte

5、rnettextDocumentResourceSetPAN@CLEF2013HeilongjiangInstituteofTechnology,KongLeilei142problmesofsourceretrievalTowcoreproblemofsourceretrievalRetrievalsourceismillionsofdocumentsfromtheInternetThisworkwasdonebyPANThequerykeywordsofsuspiciousdocumentwhichwouldbeusedforretrieval

6、arenotspecifiedHowtoextractquerykeywordisoneofimportantissuesofourwork6QueryKeywordsExtractionQueryKeywordsExtractionBasedonTF-IDFQueryKeywordsExtractionBasedonWeightedTF-IDFAdjacentQueryKeywordsExtractionbyPatTreeCombinationofQueriesandExecutionofRetrievalPAN@CLEF2013Heilong

7、jiangInstituteofTechnology,KongLeilei16KeywordsBasedonTF-IDFTF-termfrequency,denotesthefrequencyoftermiindocumentjIDF-inversedocumentfrequencyIDF=log(N/df)2jTF-IDFoftermiis:Tips:wefoundthatthetop10termswiththehighestTF-IDFcanobtainagoodresultsPAN@CLEF2013HeilongjiangInstituteo

8、fTechnology,KongLeilei17KeywordsB