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。
简介:Sonarimageshavecomplexbackground,lowcontrast,anddeteriorativeedges;thesecharacteristicsmakeitdifficultforresearcherstodisposethesonarobjects.Themulti-resolutionanalysisrepresentsthesignalsindifferentscalesefficiently,whichiswidelyusedinimageprocessing.Waveletsaresuccessfulindisposingpointdiscontinuitiesinonedimension,butnotintwodimensions.ThefiniteRidgelettransform(FRIT)dealsefficientlywiththesingularityinhighdimension.Itpresentsthreeimproveddenoisingapproaches,whicharebasedonFRITandusedinthesonarimagedisposaltechnique.Byexperimentandcomparisonwithtraditionalmethods,theseapproachesnotonlysuppresstheartifacts,butalsoobtaingoodeffectinedgekeepingandSNRofthesonarimagedenoising.
简介:Inthepastthreeyears,anunprecedentedupsurgeofdemocratizationhassweptacrossthewholeAfricaandpartofAsia,andspilledovertoLatinAmericawhichwasalreadylargelydemocratizedduringthe1980s.Muchhasbeenwrittenaboutitsprocess,nature,causes,andprospects,sothispaperwouldonlyconcen-
简介:Inthisarticleabridgebetweentheexpectedcomplexityandperformanceofspheredecoding(SD)isbuilt.TheexpectedcomplexityofSDforinfinitelatticesistheninvestigated,whichnaturallyistheupper-boundofthoseforallthefinitelatticesifgivenbythesamechannelmatrixandsignalnoiseratio(SNR).SuchexpectedcomplexityisanimportantcharacterizationofSDinmulti-antennasystems,becausenomatterwhatmodulationschemeisusedinpractice(generallyithasfiniteconstellationsize)thisupper-boundholds.AbovebridgealsoleadstoanewmethodofdeterminingtheradiusforSD.Thenumericalresultsshowboththerealvalueandupper-boundofaveragesearchednumberofcandidatesinSDfor16-QAMmodulatedsystemusingtheproposedsphereradiusdeterminingmethod.MostimportantofallnewunderstandingsofexpectedcomplexityofSDaregivenbasedonabovementionedtheoreticanalysisandnumericalresults.
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.
简介:Wepresentamathematicalmethodforaccelerationworkspaceanalysisofcooperatingmulti-fingerrobotsystemsusingamodelofpoint-contactwithfriction.Anewunifiedformulationfromdynamicequationsofcooperatingmulti-fingerrobotsisderivedconsideringtheforceandaccelerationrelationshipsbetweenthefingersandtheobjecttobehandled.Fromthedynamicequation,maximumtranslationalandrotationalaccelerationboundsofanobjectarecalculatedundergivenconstraintsofcontactconditions,configurationsoffingers,andboundsonthetorquesofjointactuatorsforeachfinger.Here,therotationalaccelerationboundscanbeappliedasanimportantmanipulabilityindexwhenthemulti-fingerrobotgraspsanobject.Toverifytheproposedmethod,weusedasetofcasestudieswithasimplemulti-fingermechanismsystem.Theachievableaccelerationboundaryintaskspacecanbeobtainedsuccessfullywiththeproposedmethodandtheaccelerationboundarydependsontheconfigurationsoffingers.
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。
简介:Thispaperproposesanautomaticmethodofporecombinationrecognition,whichisanimportantfeaturetohardwoodrecognition.Afterextractingedgefromwoodmicroscopiccross-section,basedonareahistogramofthesimilarcircleregions,themethodclassifiesallregionsintotwoclasseswithmaximumbetween-classvariance,soastodistinguishtheporefromothertextures,whicharesimilarinshapesbutdifferentinsizes.Meanwhile,secondobjectivefunctionaboutaverageareaofclosedregionsisusedtoimprovetheporesegmentationperformance.Atlast,themethodusesadjacencydegreeofporesettojudgeporecombination.Theexperimentsdemonstratethatthetaskofporesegmentationcanbecompletedsuccessfullyforallkindsofporedistributionandcombination,andalsothecorrectcombinationsofporesaregiven.
简介:Theefficientandreliablehumancentereddesignofproductsandprocessesisamajorgoalinmanufacturingindustriesfornumeroushumanfactorsmustbetakenintoaccountduringtheentirelifecycleofproducts.Amulti-agentsintelligentdesignsystemispresentedformanufacturingprocesssimulationandproducts’ergonomicanalysis.Invirtualdesignenvironment,thevirtualhumanwithhigh-levelintelligenceperformstasks’operationautonomouslyandshowsoptimumpostureconfigurationwithergonomicassessmentresultsinrealtime.Thefunctionsarerealizedbyintelligentagentsarchitecturebasedonamodernapproachderivedfromfuzzymulti-objectsdecision-makingtheory.Acasestudyispresentedtodemonstratethefeasibilityofthesuggestedmethodology.
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。
简介:Amulti-functionalsolarandskylightspectrophotometerhasbeendevelopedforthestudyofatmosphericconstituentsandaerosols.Theinstrumentanditsperformancearedescribed.Duetotelescopestructureandlock-inamplificationtechniqueadopted,thesensitivityoftheinstrumentishighenoughtoconductdirectsunmoonandtwilightmeasurementforseveralatmosphericspeciesandthedegreeofpolarizationandintensityobservationforskylight.Frommeasuredresults,thetotalcolumnabundanceofatmosphericspeciesandtheopticalcharacteristicsofaerosolcanberetrieved.Inthispaper,thedailyaveragedcolumnabundanceofO3measuredinBeijingbydirectsunwascomparedwithDobsonspectrophotometernearby.Thetwodidnotshowsignificantdifference.
简介:Inthispaper,wederivethebi-Hamiltonianstructureofamulti-componentCamassa–Holmsystem,whichassociateswiththemulti-componentAKNShierarchyandmulti-componentKNhierarchyviathetri-Hamiltoniandualitymethod.Furthermore,thespectralproblemsofthedualhierarchiesmaybeobtained.
简介:Asanoveltypeoffoundationinbeachandshallowsea,thebucketstructureisespeciallysuitableforcomplexconditionssuchassoftclaygroundandtheworsetypesofseaenvironments.Inthispaper,thebearingcapacityofamulti-bucketstructureisstudiedbyexperimentswithasinglebucketandfour-bucketfoundationinasaturatedsandlayer.Basedontheexperimentaldataandnumericalanalysisresults,thebearingcapacitybehaviorandthebucketgroupeffectarecomparedandanalyzed.Furthermore,someinfluentialfactors,suchasthesoiltype,theratiooflengthtodiameterL/D,theratioofthebucketspacingtothebucketdiameterS/D,andthebucketnumberareintroducedandtheireffectsonthemulti-bucketstructuralcapacityareinvestigatedTheverticalstaticcapacityadjustmentfactorisintroducedtoevaluatethebucketgroupeffectsofthemulti-bucketfoundation.