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ID:44712843
大小:1.38 MB
页数:7页
时间:2019-10-25
《基于证据理论信任模型的众包质量监控》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、万方数据JoumalofComputerApplications计算机应用,2015,35(8):2380—2385ISSN1001.9081CODENJYIIDU2015—08.10http://www.jOva.an文章编号:1001-9081(2015)08.2380—06doi:10.11772/j.issn.1001—9081.2015.08.2380基于证据理论信任模型的众包质量监控阮闪闪。,王小平,薛小平(同济大学电子与信息工程学院,上海201804)(}通信作者电子邮箱ss2009ahnu@163.com)
2、摘要:针对现有众包系统不能快速有效地检测众包交互过程中的恶意行为现状,从信誉角度提出基于证据理论的信任评估模型(DS_CQC)来实现众包平台的质量监控。首先,基于时间窗口获得持续可信证据序列和持续不可信证据序列;其次,从证据重要性、证据间关联和证人可信度三方面对原始D—S证据理论进行改进,获得改进的基本概率信度函数;最后,利用改进的D.S证据理论对证据序列进行融合,计算其直接信誉和间接信誉,最终获得接包方的综合信誉。模型中引入奖惩机制,用以激励接包方参与众包并提供高质量众包,同时遏剁恶意的接包方。通过仿真实验和对真实众包数
3、据的实验表明,与基于概率的信任模型相比,DS—CQC检测出持续恶意工作者、策略性恶意工作者的速度和效率至少分剐提高了50%和3.1%,具有较强的抗攻击能力。关键词:众包;质量监控;证据理论;信任模型;恶意检测;抗攻击中图分类号:TP311,5文献标志码:ACrowdsourcingqualitycontrolbasedonreputationmodelofDempster-ShafertheoryRUANShanshan。,WANGXiaoping,XUEXiaoping(SchoolofElectronicsandInf
4、ormationEngineering,如嘣University,Shanghai201804,China)Abstract:Sincetheexistingemwdsourcingmodelcouldnotdetectthemaliciousbehaviorinthecrowdsourcingsystemquicklyandefficiently,areputationmodelbasedonDempster—Shafertheory,calledDS—CQC(Dempster/ShaferCrowdsoucingQua
5、lityContml),wasproposedtoapplytothecrowdsourcingqualitycontr01.Firstly,thesustainablecredibleevidencesequenceandsustainedincredibleevidencesequencebasedontime—windowwereobtained.Secondly.theoriginalD—SevidencetheoryWasimprovedthroughthreeaspectsincludingimportance
6、ofevidence,relationshipofevidenceandreliabilityofwitness,andthenewbasicprobabilityfunctionWasacquired.Finally,evidencesequencewasfusedbyusingtheimprovedD-Sevidencetheoryandthenthedirectreputation,indirectreputationandcomprehensivereputationwerecomputed.Theincentiv
7、emechanismbasedonreputationWasusedtoencouragepeopletoparticipateincrowdsourcingactivelyandsubmitahigherqualitycrowd,whilethemaliciousworkersweresuppressed.Experimentsonsimulationandrealcrowddatawereconducted,andcomparedtothetrustmodelofprobability,thedetectionofma
8、liciousbehaviorinthecrowdsourcingsystemofDS_CQCincreasedby50%inspeedand3.1%inefficiencyatleast.TheresultprovesthattheDS—CQChasthehighanti—attackingcapab
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