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简介：TherobustH∞controlfornetworkedcontrolsystemswithbothstochasticnetwork-induceddelayanddatapacketdropoutisstudied.Whendataaretransmittedovernetwork,thestochasticdatapacketdropoutprocesscanbedescribedbyatwo-stateMarkovchain.Thenetworkedcontrolsystemswithstochasticnetwork-induceddelayanddatapacketdropoutaremodeledasadiscretetimeMarkovjumplinearsystemwithtwooperationmodes.ThesuffcientconditionofrobustH∞controlfornetworkedcontrolsystemsstabilizedbystatefeedbackcontrollerispresentedintermsoflinearmatrixinequality.Thestatefeedbackcontrollercanbeconstructedviathesolutionofasetoflinearmatrixinequalities.Anexampleisgiventoverifytheeffectivenessofthemethodproposed.

简介：Morerecently,avariationalapproachhasbeenproposedbyLinandWangfordampingmotionwithaLagrangianholdingtheenergytermdissipatedbyafrictionforce.However,themodifiedEuler-LagrangeequationobtainedwithintheirformalismleadstoanincorrectNewtonianequationofmotionduetothenonlocalityoftheLagrangian.Inthiscommunication,wegeneralizethisapproachbasedonthefractionalactionlikevariationalapproachandweshowthatundersomesimplerestrictionsconnectedtothefractionalparametersintroducedinthefractionalformalism,thisproblemmaybesolved.

简介：Inthispaper,weconsidermultigridmethodsforsolvingsymmetricnonnegativedefinitematrixequations.WepresentsomeinterestingfeaturesofthemultigridmethodandprovethatthemethodisconvergentinL2spaceandtheconvergentsolutionisuniqueforsuchnonnegativedefinitesystemandgiveninitialguess.

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简介：Inthepresentpaperatheoremisestablishedwhichofferssomenecessaryandsufficienteonditionsforahexagonalsystemtohaveperfectmatchings.

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简介：Westudystructure-preservingalgorithmstophasespacevolumeforlineardynamicalsystemsy=Lyforwhicharbitrarilyhighorderexplicitsymmetricstructure-preservingschemes,i.e.thenumericalsolutionsgeneratedbytheschemessatisfydet()=ehtrL,wheretrListhetraceofmatrixL,canbeconstructed.Fornonlineardynamicalsystemsy=f(y)Feng-Shangfirst-ordervolume-preservingschemecanbealsoconstructedstartingfrommodifiedθ-methodsandisshownthattheschemeisstructure-preservingtophasespacevolume.

简介：Theguaranteedcostcontrolproblemfornetworkedcontrolsystems(NCSs)isaddressedundercommunicationconstraintsandvaryingsamplingrate.Firstofall,asimpleinformation-schedulingschemeispresentedtodescribetheschedulingapproachofsystemsignalsinNCSs.Then,basedonsuchaschemeandgivensamplingmethod,thedesignprocedureindynamicoutputfeedbackmannerisalsoderivedwhichrenderstheclosedloopsystemtobeasymptoticallystableandguaranteesanupperboundoftheLQperformancecostfunction.

简介：Aclassoflarge-sealesystems,wheretheoverallobjectivefunctionisanonlinearfunctionofperformanceindexofeachsubsystem,isinvestigatedinthispaper.Thistypeoflarge-scalecontrolproblemisnon-separableinthesenseofconventionalhierarchicalcontrol.Hierarchicalcontrolisextendedinthepapertolarge-scalenon-separablecontrolproblems,wheremultiobjectiveoptimizationisusedasseparationstrategy.Thelarge-scalenon-separablecontrolproblemisembedded,under;ertainconditions,intoafamilyoftheweightedLagrangianformulation.TheweightedLagrangianformulationisseparablewithrespecttosubsystemsandcanbeeffectivelysolvedusingtheinteractionbalanceapproachatthetwolowerlevelsintheproposedthree-levelsolutionstructure.Atthethirdlevel,theweightingvectorfortheweightedLagrangianformulationisadjustediterativelytosearchtheoptimalweightingvectorwithwhichtheoptimaloftheoriginallarge-scalenon-separablecontrolproblemisobtained.Theoreticalbaseofthealgorithmisestablished.Simulationshowsthatthealgorithmiseffective.

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简介：OrthogonalFrequencyDivisionMultiplexing(OFDM)systemissensitivetoCarrierFrequencyOffset(CFO).Inthispaper,traditionalMaximumLikelihoodEstimators(MLE)forCFOofOFDMareintroducedfirst.Then,averagingmethodandα-filterareintroducedasLowPassFilter(LPF)toimprovetheperformanceofcyclicprefixestimator.ThebandwithofLPFisdeterminedbythecoherencetimeofradiochannel.Estimationperformanceinmultipathchannelisanalyzed.Outlierpicking-outschemeisproposedtoimproveperformancefurther.Performanceofclose-loopstructureispresentedbriefly,whichisworsethanthatofopen-loopstructure.Finally,aparallelswitchstructureoffrequencysynchronizerisproposedformobileOFDMsystems.Theschemeexploitstrainingsequenceandcyclicprefix.Theproposedsynchronizerhasawideacquisitionrange.ItisaccurateandrobustinbothAWGNchannelandmultipathchannels.Thecomplexityislowduetofunctionalityofα-filter.AbetterperformanceoffrequencysynchronizationisobtainedcomparingtothatofexistingMaximumLikelihoodEstimator(MLEs).Weachievetheseadvantageswithoutlossofbandwidthefficiency.

简介：TheconceptofsoftmatterwasfirstintroducedbyP.G.deGennesinhisacceptancespeechfortheNobelPhysicsPrizein1991.Inmechanicscommunity,however,peopleusuallypreferusingsoftmaterialinsteadofsoftmattertodescribethematerialwhoseenergyassociatedwiththermalmotioniscomparativetotheinteractionenergy.Unlikeintheconventionalcondensedmatter,entropyplaysanimportantandevendeterminativeroleinsoftmaterials.Thisparticularcharacteristicofsoftmaterialgivesbirthtoverycomplexandkaleidoscopicsystems,suchasliquidcrystals,polymers,colloids,granularmaterials,andbiologicalsystems.Softmaterialshavemanyvagariousproperties,includingstrongreactiontoweakstimulus,nonlinearresponse,self-assembly,tonameafew,whichfullyembodythecomplexitiesandparticularitiesinmulti-scalecompositions,structuresandinteractions.Theluxuriantmulti-disciplinenatureandwideapplicationsofsoftmaterialshavesuccessfullyintriguedbothscientistsandengineersworldwide.

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简介：由调制解调器时间系列分析方法，基于回归的移动一般水准(ARMA)革新建模的汽车和白噪音评价理论，使用由斜矩阵加权的最佳的熔化规则，分布式的描述符维纳状态fuser被weighting介绍为线性分离随机的描述符系统与的本地维纳状态评估者多传感器。它为州的部件认识到一个decoupled熔化评价。以便计算最佳的重量，计算的公式在本地评价错误之中跨协变性被介绍基于在本地革新过程，输入白人噪音，和测量白色之中跨协变性噪音。它能处理熔化过滤，变光滑，并且在一个统一框架的预言问题。它的精确性比每个本地评估者的高。一个蒙特卡罗模拟例子显示出它的有效性和正确性。

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