简介:BecausemodelswitchingsystemisatypicalformofTakagi-Sugeno(T-S)modelwhichisanuniversalapproximatorofcontinuousnonlinearsystems,wedescribethemodelswitchingsystemasmixedlogicaldynamical(MLD)systemanduseitinmodelpredictivecontrol(MPC)inthispaper.Consideringthateachlocalmodelisonlyvalidineachlocalregion,weaddlocalconstraintstolocalmodels.Thestabilityofproposedmulti-modelpredictivecontrol(MMPC)algorithmisanalyzed,andtheperformanceofMMPCisalsodemonstratedonaninulti-multi-output(MIMO)simulatedpHneutralizationprocess.
简介:ThetraditionalGaussianMixtureModel(GMM)forpatternrecognitionisanunsupervisedlearningmethod.Theparametersinthemodelarederivedonlybythetrainingsamplesinoneclasswithouttakingintoaccounttheeffectofsampledistributionsofotherclasses,hence,itsrecognitionaccuracyisnotidealsometimes.ThispaperintroducesanapproachforestimatingtheparametersinGMMinasupervisingway.TheSupervisedLearningGaussianMixtureModel(SLGMM)improvestherecognitionaccuracyoftheGMM.Anexperimentalexamplehasshownitseffectiveness.TheexperimentalresultshaveshownthattherecognitionaccuracyderivedbytheapproachishigherthanthoseobtainedbytheVectorQuantization(VQ)approach,theRadialBasisFunction(RBF)networkmodel,theLearningVectorQuantization(LVQ)approachandtheGMM.Inaddition,thetrainingtimeoftheapproachislessthanthatofMultilayerPerceptrom(MLP).
简介:Despiteitsname,e-commerceisnotfullyautomated.Typically,onlinetransactionsrequireasignificantlevelofhumanintervention.Customersundertakethesearchforproducts,services,potentialvendorsandbusinesspartners.Theyevaluatealternatives,decidewhatgoodstobuyandwhen,fromwhichvendor,andhowmuchtheyarewillingtopayfor.Theyengageinpotentialnegotiations,carryoutthetransactionsandsoon.Asthosemarketsbecomemature,newproductsandservices,aswellasnewpractices,arebeginningtoappear.Thereisalreadyampleevidencethatagent-basedtechnologywillbecrucialforthesedevelopments,reflectingthatbothbuyersandsellersbeingvigorouslyseektechniquestoimprovetheirperformance.ThisworksurveysseveraloftheseagentsthathelpelectroniccommercesystemsbydescribingtheirrolesinthecontextofaConsumerBuyingBehavior(CBB)model.TheCBBmodelpresentedaugmentstraditionalmarketingmodelswithconceptsfromSoftwareAgentsresearchtoaccommodateelectronicmarkets.
简介:Wepresentthesolidmodeleditdistance(SMED),apowerfulandflexibleparadigmforexploitingshapesimilaritiesamongstCADmodels.ItisdesignedtomeasurethemagnitudeofdistortionsbetweentwoCADmodelsinboundaryrepresentation(B-rep).Wegivetheformaldefinitionbyanalogywithgrapheditdistance,oneofthemostpopulargraphmatchingmethods.Toavoidtheexpensivecomputationalcostpotentiallycausedbyexactcomputation,anapproximateprocedurebasedonthealignmentoflocalstructuresetsisprovidedinaddition.Inordertoverifytheflexibility,wemakeintensiveinvestigationsonthreetypicalapplicationsinmanufacturingindustry,anddescribehowourmethodcanbeadaptedtomeetthevariousrequirements.Furthermore,amultilevelmethodisproposedtomakefurtherimprovementsofthepresentedalgorithmonbotheffectivenessandefficiency,inwhichthemodelsarehierarchicallysegmentedintotheconfigurationsoffeatures.ExperimentresultsshowthatSMEDservesasareasonablemeasurementofshapesimilarityforCADmodels,andtheproposedapproachprovidesremarkableperformanceonareal-worldCADmodeldatabase.
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简介:KnowledgerepresentationandreasoningisakeyissueoftheKnowledgeGrid.ThispaperproposesaKnowledgeMap(KM)modelforrepresentingandreasoningcausalknowledgeasanoverlayintheKnowledgeGrid.ItextendsFuzzyCognitiveMaps(FCMs)torepresentandreasonnotonlysimplecause-effectrelations,butalsotime-delaycausalrelations,conditionalprobabilisticcausalrelationsandsequentialrelations.ThemathematicalmodelanddynamicbehaviorsofKMarepresented.Experimentsshowthat,undercertainconditions,thedynamicbehaviorsofKMcantranslatebetweendifferentstates.Knowingthiscondition,expertscancontrolormodifytheconstructedKMwhileitsdynamicbehaviorsdonotaccordwiththeirexpectation.SimulationsandapplicationsshowthatKMismorepowerfulandnaturalthanFCMinemulatingrealworld.
简介:Parameterizationisoneofthekeyproblemsintheconstructionofacurvetointerpolateasetoforderedpoints.Weproposeanewlocalparameterizationmethodbasedonthecurvaturemodelinthispaper.Thenewmethoddeterminestheknotsbyminimizingthemaximumcurvatureofquadraticcurve.Whentheknotsbythenewmethodareusedtoconstructinterpolationcurve,theconstructedcurvehavegoodprecision.Wealsogivesomecomparisonsofthenewmethodwithexistingmethods,andourmethodcanperformbetterininterpolationerror,andtheinterpolatedcurveismorefairing.
简介:Engineeringapplicationdomainsneeddatabasemanagementsystemstosupplythemwithagoodmeansofmodeling,ahighdataaccessefficiencyandalanguageinterfacewithstrongfunctionality.Thispaperpresentsasemantichypergraphmodelbasedonrelations,inordertoexpressmany-to-manyrelationsamongobjectsbelongingtodifferentsemanticclassesinengineeringapplications.Amanagementmechanismexpressedbythemodelandthebasicdataofengineeringdatabasesaremanagedinmainmemory.Especially,differentobjectsarelinkedbydifferentkindsofsemanticsdefinedbyusers,thereforethetableswap,therecordswapandsomeunnecessaryexaminationsarreducedandtheaccessefficiencyoftheengineeringdataisincreased.Clanguageinterfacethatincludessomegenericandspecialfunctionalityisproposedforcloserconnectionwithapplicationprograms.
简介:Asemi-structureddocumenthasmorestructuredinformationcomparedtoanordinarydocument,andtherelationamongsemi-structureddocumentscanbefullyutilized.Inordertotakeadvantageofthestructureandlinkinformationinasemi-structureddocumentforbettermining,astructuredlinkvectormodel(SLVM)ispresentedinthispaper,whereavectorrepresentsadocument,andvectors'elementsaredeterminedbyterms,documentstructureandneighboringdocuments.TextminingbasedonSLVMisdescribedintheprocedureofK-meansforbriefnessandclarity:calculatingdocumentsimilarityandcalculatingclustercenter.TheclusteringbasedonSLVMperformssignificantlybetterthanthatbasedonaconventionalvectorspacemodelintheexperiments,anditsFvalueincreasesfrom0.65-0.73to0.82-0.86.
简介:Onthebasisofanalyzingsomeneuralnetworkstoragecapacityproblemsanetworkmodelcomprisinganewencodingandrecallingschemeispresented.Byusingsomelogicaloperationswhichoperateonthebinarypatternstringsduringinformationprocessingprocedurethemodelcanreachahighstoragecapacityforacertainsizeofnetworkframework.
简介:Amingatwaterconservancyprojectvisualization,ahidden-removalmethodofdamperspectivedrawingsisrealizedbybuildingahidden-removalmathematicalmodelforoverlappingpointslocationtosetupthehiddenrelationshipamongpointandplane,planeandplaneinspace.Onthisbasis,asanexampleofpanelrockfilldam,adamhidden-removalperspectivedrawingisgeneratedindifferentdirectionsanddifferentvisualanglesthroughadaptingVC++andOpenGLvisualizingtechnology.Theresultsshowthatthedataconstructionofthemodelissimplewhichcanovercomethedisadvantagesofconsiderableandcomplicatedcalculation.Thismethodalsoprovidesthenewmeanstodrawhidden-removalperspectivedrawingsforthoselandformsandgroundobjects.