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500 个结果
  • 简介:协会规则采矿在知识和信息发现起一个重要作用。经常为数据集,规则的一个巨大的数字能被提取,但是他们中的许多是冗余的,特别在多水平数据集的情况中。采矿非冗余的规则是一条有希望的途径解决这个问题。然而,存在工作(Pasquier等。2005,徐与Li2007)仅仅集中于单个水平数据集。在这篇论文,我们第一为冗余性和为代表非冗余的协会规则打电话给可靠基础的一个简明代表介绍一个定义,然后,我们建议延期到能移开教主的联盟者的以前的工作从多水平数据集的冗余的规则。我们也证明结果自从所有协会规则能从表示被导出,非冗余的协会规则的简明表示是无损失的。我们的延期能有效地多产生的实验表演铺平非冗余的规则。

  • 标签: 关联规则挖掘 多层次 数据集 DATASET 冗余规则 陈述
  • 简介:阀值签名起一个重要作用在现代电子社会散布一个单个权威的力量。以便增加功能并且改进阀值签名的效率,有签署当局区分的一个多政策阀值签名计划被建议。在计划,二个组能签名并且验证对方,因此计划是双向的签名并且验证。而且,二个组的阀值价值能随着签名文件的安全分类变化,每个自由签署者仅仅签署这个文件的小部分而不是整个的,为组签名建设的数据传播的带宽能因此被减少,组签名的尺寸等价于任何单个签名的。

  • 标签: 门限签名 机构 数据传输带宽 签名方案 安全分类 个人签名
  • 简介:Sonarimageshavecomplexbackground,lowcontrast,anddeteriorativeedges;thesecharacteristicsmakeitdifficultforresearcherstodisposethesonarobjects.Themulti-resolutionanalysisrepresentsthesignalsindifferentscalesefficiently,whichiswidelyusedinimageprocessing.Waveletsaresuccessfulindisposingpointdiscontinuitiesinonedimension,butnotintwodimensions.ThefiniteRidgelettransform(FRIT)dealsefficientlywiththesingularityinhighdimension.Itpresentsthreeimproveddenoisingapproaches,whicharebasedonFRITandusedinthesonarimagedisposaltechnique.Byexperimentandcomparisonwithtraditionalmethods,theseapproachesnotonlysuppresstheartifacts,butalsoobtaingoodeffectinedgekeepingandSNRofthesonarimagedenoising.

  • 标签: 多分辨力分析 微波传输 循环样本 自适应降噪
  • 简介:这篇论文为一个使能够的制造商处理能力分配问题能通过一条独立零售商隧道以及通过她的直接隧道散布她的产品到结束顾客。隧道的要求是substitutable,它导致在他们之间的竞争。我们显示那避免隧道竞争,制造商否认能力的零售商是可能的。明确地,如果隧道替换率高,低需求的一个零售商决不会被分配任何能力甚至当可得到的能力是宽大的时。当如果隧道替换率是低的,能力分配策略取决于零售商的需求时;可得到的能力。许多另外的有趣的经理的卓见被提供;与数字例子说明了。

  • 标签: 电子商务 供应链 容量分配 市场需求
  • 简介:Inthepastthreeyears,anunprecedentedupsurgeofdemocratizationhassweptacrossthewholeAfricaandpartofAsia,andspilledovertoLatinAmericawhichwasalreadylargelydemocratizedduringthe1980s.Muchhasbeenwrittenaboutitsprocess,nature,causes,andprospects,sothispaperwouldonlyconcen-

  • 标签: unprecedented party INSTITUTION AFRICA MULTI DELIVER
  • 简介:Inthisarticleabridgebetweentheexpectedcomplexityandperformanceofspheredecoding(SD)isbuilt.TheexpectedcomplexityofSDforinfinitelatticesistheninvestigated,whichnaturallyistheupper-boundofthoseforallthefinitelatticesifgivenbythesamechannelmatrixandsignalnoiseratio(SNR).SuchexpectedcomplexityisanimportantcharacterizationofSDinmulti-antennasystems,becausenomatterwhatmodulationschemeisusedinpractice(generallyithasfiniteconstellationsize)thisupper-boundholds.AbovebridgealsoleadstoanewmethodofdeterminingtheradiusforSD.Thenumericalresultsshowboththerealvalueandupper-boundofaveragesearchednumberofcandidatesinSDfor16-QAMmodulatedsystemusingtheproposedsphereradiusdeterminingmethod.MostimportantofallnewunderstandingsofexpectedcomplexityofSDaregivenbasedonabovementionedtheoreticanalysisandnumericalresults.

  • 标签: 多天线系统 复杂性 解码 可持续发展 信号噪声比 计算结果
  • 简介:TheLeastSquaresSupportVectorMachines(LS-SVM)isanimprovementtotheSVM.CombinedtheLS-SVMwiththeMulti-ResolutionAnalysis(MRA),thisletterproposestheMulti-resolutionLS-SVM(MLS-SVM).TheproposedalgorithmhasthesametheoreticalframeworkasMRAbutwithbetterapproximationability.AtafixedscaleMLS-SVMisaclassicalLS-SVM,butMLS-SVMcangraduallyapproximatethetargetfunctionatdifferentscales.Inexperiments,theMLS-SVMisusedfornonlinearsystemidentification,andachievesbetteridentificationaccuracy.

  • 标签: 支持矢量 分辨率 非线形系统 分解方法
  • 简介:Wepresentamathematicalmethodforaccelerationworkspaceanalysisofcooperatingmulti-fingerrobotsystemsusingamodelofpoint-contactwithfriction.Anewunifiedformulationfromdynamicequationsofcooperatingmulti-fingerrobotsisderivedconsideringtheforceandaccelerationrelationshipsbetweenthefingersandtheobjecttobehandled.Fromthedynamicequation,maximumtranslationalandrotationalaccelerationboundsofanobjectarecalculatedundergivenconstraintsofcontactconditions,configurationsoffingers,andboundsonthetorquesofjointactuatorsforeachfinger.Here,therotationalaccelerationboundscanbeappliedasanimportantmanipulabilityindexwhenthemulti-fingerrobotgraspsanobject.Toverifytheproposedmethod,weusedasetofcasestudieswithasimplemulti-fingermechanismsystem.Theachievableaccelerationboundaryintaskspacecanbeobtainedsuccessfullywiththeproposedmethodandtheaccelerationboundarydependsontheconfigurationsoffingers.

  • 标签: 多指机器人 加速度工作空间 点接触摩擦模型 动力学方程
  • 简介:3-D雷达反射率数据向对流规模在数据吸收为使用变得日益重要数字天气预言以及下一代降水评价。典型地,从多重雷达的反射率数据客观地被分析并且mosaiced到地区性的3-D上在被吸收进模型以前的笛卡儿的格子。与多雷达观察的马赛克联系的科学问题之一是所有观察的同步。后来,雷达数据很快通常被更新(∼every510min),由假设暴风雨在窗口以内是稳定的在一个时间窗口以内联合多重radar'观察在当前的多雷达马赛克技术是普通的。假设为慢发展降水系统成立很好,要不是快发展对流暴风雨,这个假设可以被违背,在不同时间的雷达观察的马赛克可以导致不精密的暴风雨结构描写。这研究用追踪算法的多尺度的暴风雨在多重雷达数据分析在暴风雨结构上调查同步的影响。

  • 标签: 暴雨云团 多尺度识别方法 临近预报 层级聚类法
  • 简介:在这篇论文,表演和传统的类型的声学的噪音,微多片扇子试验性地并且数字地被调查,到为居民情形优化扇子的说明。声学的噪音水平减少,但是效率随impeller的片数字的增加稍微败坏。而且,声学的噪音随在impeller插头和涡囊舌头之间的距离的增加减少,在随输入的增加和扇子效率的恶化伴随。

  • 标签: 鼓风机 热风 扇子 研究
  • 简介:Thispaperproposesanautomaticmethodofporecombinationrecognition,whichisanimportantfeaturetohardwoodrecognition.Afterextractingedgefromwoodmicroscopiccross-section,basedonareahistogramofthesimilarcircleregions,themethodclassifiesallregionsintotwoclasseswithmaximumbetween-classvariance,soastodistinguishtheporefromothertextures,whicharesimilarinshapesbutdifferentinsizes.Meanwhile,secondobjectivefunctionaboutaverageareaofclosedregionsisusedtoimprovetheporesegmentationperformance.Atlast,themethodusesadjacencydegreeofporesettojudgeporecombination.Theexperimentsdemonstratethatthetaskofporesegmentationcanbecompletedsuccessfullyforallkindsofporedistributionandcombination,andalsothecorrectcombinationsofporesaregiven.

  • 标签: ADJACENCY degree of PORE set MULTI-OBJECTIVE
  • 简介:Theefficientandreliablehumancentereddesignofproductsandprocessesisamajorgoalinmanufacturingindustriesfornumeroushumanfactorsmustbetakenintoaccountduringtheentirelifecycleofproducts.Amulti-agentsintelligentdesignsystemispresentedformanufacturingprocesssimulationandproducts’ergonomicanalysis.Invirtualdesignenvironment,thevirtualhumanwithhigh-levelintelligenceperformstasks’operationautonomouslyandshowsoptimumpostureconfigurationwithergonomicassessmentresultsinrealtime.Thefunctionsarerealizedbyintelligentagentsarchitecturebasedonamodernapproachderivedfromfuzzymulti-objectsdecision-makingtheory.Acasestudyispresentedtodemonstratethefeasibilityofthesuggestedmethodology.

  • 标签: 虚拟人 虚拟环境 模糊理论 智能化
  • 简介:Geoacoustic倒置为声学的域预言是重要的并且在浅水里匹配域本地化。梳火柴地倒置MFI和Reflectionloss倒置,多步为geoacoustic参数的贝叶斯的倒置被介绍。这个方法为随后的倒置作为优先的信息从一倒置使用了以后的概率密度PPD或倒置结果。首先,敏感参数被MFI决定。第二,感觉迟钝的参数被思考损失倒置基于PPD决定,倒置源于MFI。PPD结果比直接火柴地倒置,和一些参数的倒置结果显著地被改进的显示多步倒置方法更好被执行。为了在声音上表明多步倒置方法的优点,回答预言,传播损失的统计性质基于以后的概率被介绍。传播损失分发证明预言的声学的地基于多步倒置方法有更小的错误。

  • 标签: 多步 反转 匹配场反演 拖线阵 概率统计特性 小额信贷
  • 简介:Amulti-functionalsolarandskylightspectrophotometerhasbeendevelopedforthestudyofatmosphericconstituentsandaerosols.Theinstrumentanditsperformancearedescribed.Duetotelescopestructureandlock-inamplificationtechniqueadopted,thesensitivityoftheinstrumentishighenoughtoconductdirectsunmoonandtwilightmeasurementforseveralatmosphericspeciesandthedegreeofpolarizationandintensityobservationforskylight.Frommeasuredresults,thetotalcolumnabundanceofatmosphericspeciesandtheopticalcharacteristicsofaerosolcanberetrieved.Inthispaper,thedailyaveragedcolumnabundanceofO3measuredinBeijingbydirectsunwascomparedwithDobsonspectrophotometernearby.Thetwodidnotshowsignificantdifference.

  • 标签: REMOTE SENSING TRACE gases multi-function SPECTROPHOTOMETER
  • 简介:Inthispaper,wederivethebi-Hamiltonianstructureofamulti-componentCamassa–Holmsystem,whichassociateswiththemulti-componentAKNShierarchyandmulti-componentKNhierarchyviathetri-Hamiltoniandualitymethod.Furthermore,thespectralproblemsofthedualhierarchiesmaybeobtained.

  • 标签: bi-Hamiltonian STRUCTURE DUAL HIERARCHIES Camasssa
  • 简介:Asanoveltypeoffoundationinbeachandshallowsea,thebucketstructureisespeciallysuitableforcomplexconditionssuchassoftclaygroundandtheworsetypesofseaenvironments.Inthispaper,thebearingcapacityofamulti-bucketstructureisstudiedbyexperimentswithasinglebucketandfour-bucketfoundationinasaturatedsandlayer.Basedontheexperimentaldataandnumericalanalysisresults,thebearingcapacitybehaviorandthebucketgroupeffectarecomparedandanalyzed.Furthermore,someinfluentialfactors,suchasthesoiltype,theratiooflengthtodiameterL/D,theratioofthebucketspacingtothebucketdiameterS/D,andthebucketnumberareintroducedandtheireffectsonthemulti-bucketstructuralcapacityareinvestigatedTheverticalstaticcapacityadjustmentfactorisintroducedtoevaluatethebucketgroupeffectsofthemulti-bucketfoundation.

  • 标签: BUCKET GROUP EFFECT COMPOSITE multi-bucket structure