基于可信机制与用户偏好模型的推荐技术的-研究与应用

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1、AbstractTrust·basedrecommendationhasbeenanimportantresearchtopicinrecommende，rsystemresearch．Inthisthesis，inordertosolvetheproblemofuser-tagpreferencesparsityandthatitishardtorecommendwhenthenumberoftrustedusersisnotenough，wefocusonatrust-basedrecommendationmodelwithuser-tagpreference．Thus，wec

2、allrecommendusers’interestingresourcestothem．Themainresearchesinthisthesisinclude：1)ResearchesonrelatedtrustmodelsandproposalofanewtrustmodelcalledMPDTrust，consideringbothimplicitdirecttrustandindirecttrust．ImplicitdirecttrustinMPDTrustisbasedonratinginformationofusersconsideringthenumberofuse

3、rs’CO—rateditems，ratingtimeandratingerror．IndirecttrustinMPDTrustisbasedonTidalTrustconsideringthemaximumtrustpropagationdistance．2)Researchesonuser-tagpreferencemodels．Notonlyusers’ratingsandtagswereconsideredincalculatinguser-tagpreferences，butalsotimeinformationwasconsidered．Inaddition，wepr

4、esentamethodofexpandinguser‘tagpreferenceswithconsideringthecorrelationoftagsandtagpreferencesoftrustedusers．3)Proposalofatrust-basedrecommendationmodelwithuser·tagpreference，calledTUPTR．4)DesignandimplementationtheTFUPFilmrecommendersystem．Ourmaincontributionsinthisthesisare"1)Proposalofatrus

5、tmodelbasedonmaximumtrustpropagationdistance，whichconsidersimplicitdirecttrust．2)Proposalofamethodofextendinguser-tagpreferencesconsideringthecorrelationoftagsandtagpreferencesoftrustedusers．3)Proposalofatrust—basedrecommendationmodelwithuser-tagpreference，calledTUPTR．Theresearchinthisthesiswo

6、uldbevaluabletothestudiesofrecommendationbasedontrustnetworkanduserpreference．Keywords：trust；tag；userpreference；recommendationII图目录图2-1信任的非对称性⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．8图2．2信任的传递性⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．8图2．3不同类型信任的组合⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯9图2．4不同信任路径的组合⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯9图2．5信任网络示例⋯⋯⋯⋯⋯⋯⋯

7、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯一11图2-6在信任网络中计算trust(S，E)⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．12图2．7TidalTrust模型中设定阈值的过程⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯13图2—8抛弃高可信长路径的示例⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯一14图2-9乘法算子导致信任值过低的示例⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．15图2．10信任计算⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。16图2．11信任网络中间接信任的路径选择