学科分类
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145 个结果
  • 简介:AMultimediastreamsdynamicratecontrolalgorithmbasedonFuzzyadaptivePID(MFPID)hasbeenproposedtoimplementmultimediastreams'endsendingrateon-lineself-regulatingandsmoothing,andtotracksystemresourcesintime,sothatitcanavoidsystem'sregulatingoscillationandguaranteesystem'sstability.And,someworkhasbeendonetoanalyzeadaptivesessionmodelofmultimediastreams,toimplementfutureavailablebandwidthestimationofIPnetwork,toachievePIDparameters'on-lineself-tuningbyfuzzycontrolling.SimulationvalidatedthetheoreticalresultsofMFPID.

  • 标签: 多媒体传播 发射率 PID 自适应控制 模糊参数
  • 简介:ToovercometheshortcomingsoftheLeeimageenhancementalgorithmanditsimprovementbasedonthelogarithmicimageprocessing(LIP)model,thispaperproposeswhatwebelievetobeaneffectiveimageenhancementalgorithm.Thisalgorithmintroducesfuzzyentropy,makesfulluseofneighborhoodinformation,fuzzyinformationandhumanvisualcharacteristics.Toenhanceanimage,thispaperfirstcarriesoutthereasonablefuzzy-3partitionofitshistogramintothedarkregion,intermediateregionandbrightregion.Itthenextractsthestatisticalcharacteristicsofthethreeregionsandadaptivelyselectstheparameterαaccordingtothestatisticalcharacteristicsoftheimage’sgray-scalevalues.Italsoaddsausefulnonlineartransform,thusincreasingtheubiquityofthealgorithm.Finally,thecausesforthegray-scalevalueovercorrectionthatoccursinthetraditionalimageenhancementalgorithmsareanalyzedandtheirsolutionsareproposed.Thesimulationresultsshowthatourimageenhancementalgorithmcaneffectivelysuppressthenoiseofanimage,enhanceitscontrastandvisualeffect,sharpenitsedgeandadjustitsdynamicrange.

  • 标签: IMAGE enhancement FUZZY ENTROPY FUZZY PARTITION
  • 简介:Thispaperpresentsanewsolutiontotheimagesegmentationproblem,whichisbasedonfuzzy-neural-networkhybridsyste

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  • 简介:Anadaptivefuzzyslidingmodecontrol(AFSMC)approachisproposedforaroboticairship.First,themathematicalmodelofanairshipisderivedintheformofanonlinearcontrolsystem.Second,anAFSMCapproachisproposedtodesigntheattitudecontrolsystemofairship,andtheglobalstabilityoftheclosed-loopsystemisprovedbyusingtheLyapunovstabilitytheorem.Finally,simulationresultsverifytheeffectivenessandrobustnessoftheproposedcontrolapproachinthepresenceofmodeluncertaintiesandexternaldisturbances.

  • 标签: 自适应模糊滑模控制 模型不确定性 外部干扰 机器人 LYAPUNOV稳定性 飞船
  • 简介:Inthispaper,afuzzyreasoningbasedtemporalerrorconcealmentmethodisproposed.ThebasictemporalerrorconcealmentisimplementedbyestimatingMotionVector(MV)ofthelostMacroBlock(MB)fromitsneighboringMVs.WhichMVisthemostproperoneisevaluatedbysomecriteria.Generally,twocriteriaarewidelyused,namelySideMatchDistortion(SMD)andSumofAbsoluteDifference(SAD)ofcorrespondingMV.However,eachcriterioncouldonlypartlydescribethestatusoflostblock.Toaccomplishthejudgementmoreaccurately,thetwomeasuresareconsideredtogether.ThusarefinedmeasurebasedonfuzzyreasoningisadoptedtobalancetheeffectsofSMDandSAD.TermsSMDandSADareregardedasfuzzyinputandtheterm‘similarity’asoutputtocompletefuzzyreasoning.ResultoffuzzyreasoningrepresentshowthetestedMVissimilartotheoriginalone.Andk-meansclusteringtechniqueisperformedtodefinethemembershipfunctionofinputfuzzysetsadaptively.Accordingtotheexperimentalresults,theconcealmentbasedonnewmeasureachievesbetterperformance.

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  • 简介:AnovelH_∞tracking-baseddecentralizedindirectadaptiveoutputfeedbackfuzzycontrollerforaclassofuncertainlarge-scalenonlinearsystemsisdeveloped.Byvirtueoftheproperfilteringoftheobservationerrordynamics,theobserver-baseddecentralizedindirectadaptivefuzzycontrolschemeispresentedforaclassoflarge-scalenonlinearsystemsusingthecombinationofH_∞trackingtechnique,afuzzyadaptiveobserverandfuzzyinferencesystems.Theoutputfeedbackandadaptationmechanismsarebothrobustandimplementableindeedowingtotheirfreedomfromtheunavailableobservationerrorvector.Allthesignalsoftheclosed-looplargescalesystemareguaranteedtostayuniformlyboundedandtheoutputerrorstakeonH_∞trackingperformance.Simulationresultssubstantiatetheeffectivenessoftheproposedscheme.

  • 标签: 分散性线性系统 系统分析 系统工程 适应性
  • 简介:Uncertainandhesitantinformation,widelyexistinginthereal-worldqualitativedecisionmakingproblems,bringsgreatchallengestodecisionmakers.Hesitantfuzzylinguistictermsets(HFLTSs),aneffectivelinguisticcomputationaltoolinmodelingandelicitingsuchinformation,havehencearousedmanyscholars’interestsandsomeextensionshavebeenintroducedrecently.However,thesemethodsarebasedonthediscretelinguistictermframeworkwiththelimitedexpressiondomain,whichactuallydepictqualitativeinformationusingseveralsinglevalues.Therefore,itishardtoensuretheintegrityofthesemanticsrepresentationandtheaccuracyofthecomputationresults.Todealwiththisproblem,asemanticsbasisframeworkcalledcompletelinguistictermset(CLTS)isdesigned,whichadoptsaseparationstructureoflinguisticscaleandexpressiondomain,enrichingsemanticsrepresentationofdecisionmakers.Onthisbasistheconceptoffuzzyintervallinguisticsets(FILSs)isputforwardthatemploystheintervallinguistictermwithprobabilitytoincreasetheflexibilityofelicitingandrepresentinguncertainandhesitantqualitativeinformation.Forpracticalapplications,afuzzyintervallinguistictechniquefororderpreferencebysimilaritytoidealsolution(FILTOPSIS)methodisdevelopedtodealwithmulti-attributegroupdecisionmaking(MAGDM)problems.Throughthecasesofmovieandenterpriseresourceplanning(ERP)systemselection,theeffectivenessandvalidityoftheproposedmethodareillustrated.

  • 标签: hesitant FUZZY SETS MULTI-ATTRIBUTE group decision
  • 简介:Aimingtoreducethecomputationalcostsandconvergetoglobaloptimum,anovelmethodisproposedtosolvetheoptimizationofacostfunctionintheestimationofdirectionofarrival(DOA).Inthismethod,ageneticalgorithm(GA)andfuzzydiscreteparticleswarmoptimization(FDPSO)areappliedtooptimizethedirectionofarrivalandpowerparametersofthemodesimultaneously.Firstly,theGAalgorithmisappliedtomakethesolutionfallintotheglobalsearching.Secondly,theFDPSOmethodisutilizedtonarrowdownthesearchfield.InFDPSO,achaoticfactorandacrossovermethodareaddedtospeeduptheconvergence.Thisapproachhasbeendemonstratedthroughsomecomputationalsimulations.ItisshownthattheproposedalgorithmcanestimateboththeDOAandthepowersaccurately.Itismoreefficientthansomepresentmethods,suchastheNewton-likealgorithm,Akaikeinformationcritical(AIC),particleswarmoptimization(PSO),andgeneticalgorithmwithparticleswarmoptimization(GA-PSO).

  • 标签: 离散粒子群优化 遗传算法 DOA 模糊 粒子群优化算法 估算
  • 简介:Anovelactivecontourmodelisproposed,whichincorporateslocalinformationdistributionsinafuzzyenergyfunctiontoeffectivelydealwiththeintensityinhomogeneity.Moreover,theproposedmodelisconvexwithrespecttothevariablewhichisusedforextractingthecontour.Thismakesthemodelindependentontheinitialconditionandsuitableforanautomaticsegmentation.Furthermore,theenergyfunctionisminimizedinacomputationallyefficientwaybycalculatingthefuzzyenergyalterationsdirectly.Experimentsarecarriedouttoprovetheperformanceoftheproposedmodeloversomeexistingmethods.Theobtainedresultsconfirmtheefficiencyofthemethod.

  • 标签: 主动轮廓模型 图像分割 分布拟合 模糊 高斯 能量函数
  • 简介:Afuzzyparticleswarmoptimization(PSO)onthebasisofelitearchivingisproposedforsolvingmulti-objectiveoptimizationproblems.First,anewperturbationoperatorisdesigned,andtheconceptsoffuzzyglobalbestandfuzzypersonalbestaregivenonbasisofthenewoperator.Afterthat,particleupdatingequationsarerevisedonthebasisofthetwonewconceptstodiscouragetheprematureconvergenceandenlargethepotentialsearchspace;second,theelitearchivingtechniqueisusedduringtheprocessofevolution,namely,theeliteparticlesareintroducedintotheswarm,whereastheinferiorparticlesaredeleted.Therefore,thequalityoftheswarmisensured.Finally,theconvergenceofthisswarmisproved.TheexperimentalresultsshowthatthenondominatedsolutionsfoundbytheproposedalgorithmareuniformlydistributedandwidelyspreadalongtheParetofront.

  • 标签: 多物镜系统 最佳化设计 粒子群 模糊计算
  • 简介:Themultipleattributedecisionmakingproblemsarestudied,inwhichtheinformationaboutattributeweightsispartlyknownandtheattributevaluestaketheformofintuitionisticfuzzynumbers.Theoperationallawsofintuitionisticfuzzynumbersareintroduced,andthescorefunctionandaccuracyfunctionarepresentedtocomparetheintuitionisticfuzzynumbers.Theintuitionisticfuzzyorderedweightedaveraging(IFOWA)operatorwhichisanextensionofthewell-knownorderedweightedaveraging(OWA)operatorisinvestigatedtoaggregatetheintuitionisticfuzzyinformation.Inordertodeterminetheweightsofintuitionisticfuzzyorderedweightedaveragingoperator,alineargoalprogrammingprocedureisproposedforlearningtheweightsfromdata.Finally,anexampleisillustratedtoverifytheeffectivenessandpracticabilityofthedevelopedmethod.

  • 标签: 有序加权平均算子 线性目标规划 权重信息 模糊数 直觉 多属性决策问题
  • 简介:Inthispaper,weproposeaknowledgediscoverymethodbasedonthefuzzysettheorytohelpelderswithplantcultivation.Initially,thefuzzysetsareconstructedbyusingthefeatureselectionandstatisticalintervalestimation.Themin-maxinferenceandthecenterofgravitydefuzzificationmethodarethenusedtooutputacandidatepatternset.Finally,apatterndiscoveryisadoptedtoobtainthepatternsfromthecandidatesetforthecultivationsuggestionsbyconsideringthefrequencyweightanduser’sexperience.Inordertodemonstratetheperformanceofourmethodinplantingsystems,weconductaclicks-and-mortarcultivationplatform,namelyEdenGarden,fortheelderlylifestylesofhealthandsustainability(LOHAS).Theexperimentalresultsshowthattheaccuracyrateofourknowledgediscoverymethodcanreachupto85%.Moreover,theresultsoftheLOHASindexscaletablepresentthatthehappinessoftheeldersisincreasingwhiletheeldersareusingourproposedmethod.

  • 标签: 模糊集理论 种植制度 知识发现 老人 同数 发现方法
  • 简介:UnlikethepreviousresearchworksanalyzingthestabilityoftheT-S(Takagi?Sugeno)fuzzymodel,anextensiononthestabilityconditionofT-Sfuzzysystemswithadifferentstrategyisprovided.Inthestrategyanewvariable,whichisrelativetothegradeoffuzzymembershipfunction,isintroducedtothestabilityanalysisandanewstabilityconclusionisdeduced.Thedefinitionofstabilityconditioninthispaperisdifferentfrompreviousworks,thoughtheyaresimilarinform.Withtheproposedmethod,thesimulationinflightcontrollawshowsabettereffectiveness.

  • 标签: TS模糊模型 稳定性条件 飞行控制律 模糊系统 原理设计 稳定性分析
  • 简介:Thispaperpresentsthedesignandimplementationofanenergymanagementsystem(EMS)withwavelettransformandfuzzycontrolforaresidentialmicro-grid.Thehybridsysteminthispaperconsistsofawindturbinegenerator,photovoltaic(PV)panels,anelectricvehicle(EV),andasupercapacitor(SC),whichisabletoconnectordisconnecttothemaingrid.Thecontrolstrategyisresponsibleforcompensatingthedifferencebetweenthegeneratedpowerbythewindandsolargeneratorsandthedemandedpowerbytheloads.Wavelettransformdecomposesthepowerdifferenceintoasmoothedcomponentandafastfluctuatedcomponent.Thecommandapproachusedforfuzzylogicrulesconsidersthestateofcharging(SOC)ofEV,renewableproduction,andtheloaddemandasparameters.Furthermore,thecommandrulesaredevelopedinordertoensureareliablegridwhentakingintoaccounttheEVbatteryprotectiontodecidetheoutputpoweroftheEV.ThemodelofthehybridsystemisdevelopedindetailunderMatlab/Simulinksoftwareenvironment.

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  • 简介:Anewapproachtoknowledgeacquisitioninincompleteinformationsystemwithfuzzydecisionsisproposed.Insuchincompleteinformationsystem,theuniverseofdiscourseisclassifiedbythemaximaltoleranceclasses,andfuzzyapproximationsaredefinedbasedonthem.Threetypesofrelativereductsofmaximaltoleranceclassesarethenproposed,andthreetypesoffuzzydecisionrulesbasedontheproposedattributedescriptionaredefined.ThejudgmenttheoremsandapproximationdiscernibilityfunctionswithrespecttothemarepresentedtocomputetherelativereductbyusingBooleanreasoningtechniques,fromwhichwecanderiveoptimalfuzzydecisionrulesfromthesystems.Atlast,threetypesofrelativereductsofthesystemandtheircomputingmethodsaregiven.

  • 标签: 决策信息系统 系统模糊决策 耐受 规则优化 属性约简 分类
  • 简介:Telstra选用Amdocs产品11月24日亚洲移动通信大会上,客户体验系统提供商Amdocs公司宣布,Telstra部署了AmdocsChangingWorlds的个性化技术,以支持其BigPond移动门户,该门户能够通过移动设备为客户提供新闻及资讯服务。Telstra全面强化了BNPond移动门户网站的功能,

  • 标签: 应用类 市场 移动通信 客户体验 移动门户 移动设备
  • 简介:中国移动最后十省资产在香港联交所的敲锣上市,迎来了中国电信业整体上市的收官阶段,中国移动也因此在资本市场花魁独占。此前不久,中国联通实现了除贵州外30个内地省公司资产的上市,离整体上市仅一步之遥。虽然中国电

  • 标签: 整体上市 资产 中国移动 资本 中国电信业 中国联通