简介:在许多机器学习应用程序,数据不是免费的,并且为每个数据项目有测试费用。为节俭的原因,最小化测试的某存在工作尝试花费了并且同时,保存一个给定的决定系统的一个特别性质。在这份报纸,我们指出一个人能负担得起的测试费用在一些应用是有限的。因此,一个人不得不牺牲各自的性质在一项预算下面保留测试费用。形式化这期,我们定义测试费用限制属性减小问题,在优化目的是最小化有条件的信息熵的地方。这个问题是test-cost-sensitive属性减小问题和0-1背囊问题的必要归纳,因此它是更挑战性的。我们基于信息获得和测试费用建议一个启发式的算法处理新问题。算法在四UCI上被测试(加利福尼亚大学-Irvine)有各种各样的测试的数据集花费了背景。试验性的结果显示唯一的userspecified参数的适当设置。
简介:Thisarticleisconcernedwiththemodelingandcontrolproblemsoftheflexiblespacecraft.First,thestateobserverisdesignedtoestimatethevibrationmodeonthebasisoffreevibrationmodels.Then,anoptimalguaranteedcostcontrollerisproposedtostabilizesystemattitudeanddampthevibrationoftheflexiblebeamatthesametime.Numericalsimulationexamplesshowthefeasibilityandvalidityoftheproposedmethod.
简介:Becauseoflimitedresourceofembeddedplatforms,thecomputationalcomplexityofadvancedcontrolalgorithmsraisessignificantchallengesfortheuseofembeddedsystemsincomplexcontrolfield.AScilab/Scicosbasedembeddedcontrollerisdevelopedonwhichvariouscontrolsoftwarecanbeeasilymodeled,simulated,implemented,andevaluatedtomeettheever-expandingrequirementsofindustrialcontrolapplications.BuiltontheCirrusLogicEP9315ARMsystems-on-chipboard,thisembeddedcontrollerispossibletodevelopcomplexembeddedcontrolsystemsthatemployadvancedcontrolstrategiesinarapidandcost-efficientfashion.Duetothefreeandopensourcenatureofthesoftwarepackagesused,thecostoftheembeddedcontrollerisminimized.
简介:Anewlow-costdemodulatorforZigBeereceiverssatisfyingrequirementsofIEEE802.15.4standardispresented,whichisdesignedforISM2.4GHzbandandbasedonZero-IFreceivers.ThisdemodulatorextractssymbolsdirectlyfrombasebandsignalratherthanrecoveringPNcodechips,soitsstructureissimple.Twomaintechniquesareusedtoimprovetheperformanceofdemodulator.OneisPhase-AxisCrossingDetector(PACD)whichdetectsthephasecorrelationofbasebandsignal.Theotherissymbolsynchronizationandsamplingclockcorrectionalgorithm.Theresultshowsthatthisdemodulatorperformance,SymbolErrorRate(SER)andPacketErrorRate(PER)meetIEEE802.15.4TMstandardrequirementsandthedemodulatorcanhandlefrequencyoffsetinexcessof200kHz,involvingaZero-IFreceiverwithaNoiseFigure(NF)lowerthan17dB,whichiseasilyimple-mentedinstandardCMOStechnology.
简介:Thereliabilityoftheproductsoldunderawarrantyisusuallymaintainedbythemanufacturerduringthewarrantyperiod.Aftertheexpiryofthewarranty,however,theconsumerconfrontsaproblemabouthowtomaintainthereliabilityoftheproduct.Thispaperproposes,fromtheconsumer’sperspective,areplacementpolicyaftertheextendedwarranty,undertheassumptionthattheproductissoldundertherenewablefreereplacementwarranty(RFRW)policyinwhichthereplacementisdependentontherepair-costthreshold.Theproposedreplacementpolicyisthereplacementaftertheextendedwarrantyisperformedbytheconsumerbasedontherepair-costthresholdorpreventivereplacement(PR)age,whicharedecisionvariables.Theexpectedcostratemodelisderivedfromtheconsumer’sperspective.Theexistenceanduniquenessoftheoptimalsolutionthatminimizestheexpectedcostrateperunittimeareoffered.Finally,anumericalexampleispresentedtoexemplifytheproposedmodel.
简介:Aguaranteedcostcontrolproblemforaclassoflineardiscrete-timeswitchedsystemswithnorm-boundeduncertaintiesisconsideredinthisarticle.Thepurposeistoconstructaswitchingruleanddesignastatefeedbackcontrollaw,suchthat,theclosed-loopsystemisasymptoticallystableandtheclosed-loopcostfunctionvalueisnotmorethanaspecifiedupperboundforalladmissibleuncertaintiesundertheconstructedswitchingrule.AsufficientconditionfortheexistenceofguaranteedcostcontrollersandswitchingrulesisderivedbasedontheLyapunovtheorytogetherwiththelinearmatrixinequality(LMI)approach.Furthermore,aconvexoptimizationproblemwithLMIconstraintsisformulatedtoselectthesuboptimalguaranteedcostcontroller.Anumericalexampledemonstratesthevalidityoftheproposeddesignapproach.
简介:Thisarticleconcernsthedelay-independentguaranteed-costcontrolproblemviamemorylessstatefeedbackforaclassofneutral-typesystemswithstructuraluncertaintyandagivenquadraticcostfunction.Newdelay-independentconditionsfortheexistenceoftheguaranteed-costcontrollerarepresentedinthetermofLMIs.Analgorithminvolvingoptimizationisproposedtodesignacontrollerachievinganoptimalguaranteed-cost,suchthat,thesystemcanbestabilizedforalladmissibleuncertainties.Anumericalexampleisprovidedtoillustratethefeasibilityoftheproposedmethod.
简介:Adual-channelaccessmechanismtoovercomethedrawbackoftraditionalsingle-channelaccessmechanismfornetwork-on-chip(NoC)isproposed.Intraditionalsingle-channelaccessmechanism,everyInternetprotocol(IP)hasonlyonechanneltoaccesstheon-chipnetwork.Whenthenetworkisrelativelyidle,theinjectionrateistoosmalltomakegooduseofthenetworkresource.Whenthenetworkisrelativelybusy,theejectionrateissosmallthatthepacketsinthenetworkcannotleaveimmediately,andthustheprobabilityofcongestionisincreased.Inthedual-channelaccessmechanism,theinjectionrateofIPandtheejectionrateofthenetworkareincreasedbyusingtwooptionalchannelsinnetworkinterface(NI)andlocalportofrouters.Therefore,thecommunicationperformanceisimproved.Experimentalresultsshowthatcomparedwithtraditionalsingle-channelaccessmechanism,theproposedschemegreatlyincreasesthethroughputandcutsdowntheaveragelatencywithreasonableareaincrease.
简介:Thisresearchisaimedtodevelopaconsumerdemandingsideresponsemodeltoassistelectricityconsumerstomitigatepeakdemandsduringthepeakseason.Themaincontributionofthisresearchisshowingthatconsumerscanmitigatepeakdemandsbyoptimizingenergycostsofanairconditioner(AC)whenaspikehappens.Itmayonlyoccurinaoneandahalfhoursspikeduringthepeakseason.ThismodelalsoinvestigateshowACappliesthepre-coolingmethodwhenthereisasubstantialriskofapricespike.Theresultsindicatethatthepotentialbenefitofthemodelisachievingenergysavingsforconsumersandaggregators,alsoreducingelectricitybillsfortheconsumers.Themodelistestedwithselectedcharacteristicsoftheroom,andbasedonthestandardroominaresidentialhouseinMakassar,acityofIndonesia.
简介:Themagneticimprovisedexplosivedevices(IEDs),alsocommonlyknownasatypeofastickybomb,issimplyconstructeddevicesyetverylethal.Thispaperputsforwardtheideaofanelectroniccompassthatiscapableofsensingthechangeofamagneticfieldgeneratedbyamagnetandtranslatingitintointerpretabledata,whichcouldactasthebaseforthefurtherstudiesandassistindevelopingagreenerautomatedsystemfordetectingthisdevice.Theelectroniccompassisspecificallychosenforreducingpowerconsumptionofsystemsinadditiontothefactthatitisavailableatalowcost.
简介:A10Gbit/s16-km-longreconfigurablewavelength-division-multiplexingpassiveopticalnetwork(WDM-PON)ispresentedempoweredbyalow-costmulti-channeldirectlymodulatedlaser(DML)module.Comparedwiththecaseusingdiscretedevicesinconventionalscheme,theproposedDMLmoduleprovidesacost-effectivesolutionwithreducedcomplexity.Thecleareyediagramandthebiterrorrate(BER)oflessthan2×10~(-7)withasensitivityof-7dBmareobtained.Duetothespecialpackagingdesign,thecrosstalkbetweenchannelsunderconditionofsimultaneousoperationcanbenegligible.