学科分类
/ 2
23 个结果
  • 简介:设计者被要求计划让未来扩大估计格子的未来利用。有效建模和预报技术,它将高效地使用信息在可用数据,可用资料包含了的这个工具,被要求,以便重要数据性质能被提取并且投射进未来。这研究基于划分算法(MMPA)的多模型建议一个适应方法,为短期的电负担用真实数据预报。格子的利用开始用趋于增加的季节的ARIMA被建模(汽车回归的综合移动平均数)模型。建议方法经过数据使用听说并且当模特儿正常周期的行为电的格子。任何一个ARMA(汽车回归的移动平均数)或州空间的模型能被用于当模特儿的负担模式。象可以出现在夏天或意外差错(停电)期间的意外山峰那样的负担异例也被建模。如果负担模式不匹配负担的正常行为,一个异例被检测,而且,当模式匹配异例的一个已知的盒子时,异例的类型被识别。真实数据被使用,真实盒子基于测量被测试大量希腊公共力量合作S.A,雅典,希腊。过滤算法的应用适应多模型成功地识别正常周期的行为和电的格子的任何不平常的活动。建议方法的表演也与由ARIMA模型生产了那相比。

  • 标签: 自适应多模式滤波器 ARIMA 负载预测 KALMAN滤波器
  • 简介:Awoofer–tweeteradaptiveopticalstructuredilluminationmicroscope(AOSIM)ispresented.Bycombiningalow-spatial-frequencylarge-strokedeformablemirror(woofer)withahigh-spatial-frequencylow-strokedeformablemirror(tweeter),weareabletoremovebothlarge-amplitudeandhigh-orderaberrations.Inaddition,usingthestructuredilluminationmethod,ascomparedtowidefieldmicroscopy,theAOSIMcanaccomplishhighresolutionimagingandpossessesbettersectioningcapability.TheAOSIMwastestedbycorrectingalargeaberrationfromatriallensintheconjugateplaneofthemicroscopeobjectiveaperture.TheexperimentalresultsshowthattheAOSIMhasapointspreadfunctionwithanFWHMthatis140nmwide(usingawaterimmersionobjectivelenswithNA=1.1)aftercorrectingalargeaberration(5.9μmpeak-to-valleywavefronterrorwith2.05μmRMSaberration).Afterstructuredlightilluminationisapplied,theresultsshowthatweareabletoresolvetwobeadsthatareseparatedby145nm,1.62×belowthediffractionlimitof235nm.Furthermore,wedemonstratetheapplicationoftheAOSIMinthefieldofbioimaging.Thesampleunderinvestigationwasagreen-fluorescentprotein-labeledDrosophilaembryo.Theaberrationsfromtherefractiveindexmismatchbetweenthemicroscopeobjective,theimmersionfluid,thecoverslip,andthesampleitselfarewellcorrected.UsingAOSIMwewereabletoincreasetheSNRforourDrosophilaembryosampleby5×.

  • 标签:
  • 简介:Wepresentanovelalgorithmforadaptivetriangularmeshcoarsening.Thealgorithmhastwostages.First,theinputtriangularmeshisrefinedbyiterativelyapplyingtheadaptivesubdivisionoperatorthatperformsaso-calledred-greensplit.Second,therefinedmeshissimplifiedbyaclusteringalgorithmbasedoncentroidalVoronoitessellations(CVTs).TheaccuracyandgoodqualityoftheoutputtriangularmeshareachievedbycombiningadaptivesubdivisionandtheCVTstechnique.Testresultsshowedthemeshcoarseningschemetoberobustandeffective.Examplesareshownthatvalidatethemethod.

  • 标签: Voronoi图 自适应细分 三角网格 形心 CVT变速器 聚类算法
  • 简介:Thispaperproposesanewadaptivepost-filteringalgorithmtoremovecodingartifactsinblock-basedvideocoder.Theproposedmethodconcentratesonblockingandringingartifactsremoval.Forde-blocking,theblockingstrengthisidentifiedtodeterminethefilteringrange,andthemaximumquantizationparameteroftheimageisusedtoadaptthe1Dfuzzyfilter.Forde-ringing,besidestheedgedetection,acomplementaryringingdetectionmethodisproposedtolocatetheneglectedringingblocks,andthegradientthresholdisadoptedtoadjusttheparameterof2Dfuzzyfilter.ExperimentsareperformedontheMPEG-4sequences.Comparedwithothermethods,theproposedoneachievesbetterdetailpreservationandartifactsremovalperformancewithlowercomputationalcost.

  • 标签: 自适应模糊滤波器 视频 图象 编码器 振铃效应 块效应
  • 简介:Inthispaper,weconsiderthesynchronizationofchaoticHindmarshRose(HR)neuronsviaascalarcontrolinput.ChaoticHRneuronscoupledwithagapjunctionaretakenintoconsideration,andanactivecompensationmechanism-basedadaptivecontrolisemployedtorealizethesynchronizationoftwoHRneurons.Assuchanadaptivecontrolisutilized,anaccuratemodelofthesystemisofnonecessity.AsymptoticalsynchronizationoftwoHRneuronsisguaranteedbytheoreticalresults.Numericalresultsarealsoprovidedtoconfirmtheproposedsynchronizationapproach.

  • 标签: 混沌同步 神经元 自适应方法 HR 耦合 自适应控制
  • 简介:我们建议一条新奇途径叫了适应模糊基于蚂蚁的路由(在远处)一组聪明的代理人(或蚂蚁)造在一双节点之间的路径,并发地探索网络并且交换获得的信息更新路由搁置。路由决定能被模糊逻辑技术基于另外的代理人的行为的一个以前的集合构造的当前的网络状态和知识的本地信息做。模糊逻辑技术允许象路径延期和路径利用那样的多重限制以一个简单、直觉的方法被考虑。在远处超过OSPF,AntNet和ASR的模拟试验表演,中的三个当前很重要的最先进的算法以端对端的延期,包交货,和包落下比率。在远处是为在下一代网络的数据的路由的一种有希望的选择。

  • 标签: 通信网络 模糊路由选择网络 集群智能 自适应性
  • 简介:Videoobjectsegmentationisimportantforvideosurveillance,objecttracking,videoobjectrecognitionandvideoediting.Anadaptivevideosegmentationalgorithmbasedonhiddenconditionalrandomfields(HCRFs)isproposed,whichmodelsspatio-temporalconstraintsofvideosequence.Inordertoimprovethesegmentationquality,theweightsofspatio-temporalcon-straintsareadaptivelyupdatedbyon-linelearningforHCRFs.Shadowsarethefactorsaffectingsegmentationquality.Toseparateforegroundobjectsfromtheshadowstheycast,lineartransformforGaussiandistributionofthebackgroundisadoptedtomodeltheshadow.Theexperimentalresultsdemonstratedthattheerrorratioofouralgorithmisreducedby23%and19%respectively,comparedwiththeGaussianmixturemodel(GMM)andspatio-temporalMarkovrandomfields(MRFs).

  • 标签: 自适应前景分割 视频分割 阴影消除 隐藏有条件随机场
  • 简介:Anoveladaptive–impulsiveschemeisproposedforsynchronizingfractional-orderchaoticsystemswithoutthenecessityofknowingtheattractors’boundsinpriori.ThenonlinearfunctionsinthesesystemsaresupposedtosatisfylocalLipschitzconditionsbutwhichareestimatedwithadaptivelaws.Thenoveltyisthatthecombinationofadaptivecontrolandimpulsivecontroloffersacontrolstrategygatheringtheadvantagesofboth.Inordertoguaranteetheconvergenceisnolessthananexpectedexponentialrate,acombinedfeedbackstrengthdesigniscreatedsuchthatthesymmetricaxiscanshiftfreelyaccordingtotheupdatedtransientfeedbackstrength.AlloftheunknownLipschitzconstantsarealsoupdatedexponentiallyinthemeantimeofachievingsynchronization.Twodifferentfractional-orderchaoticsystemsareemployedtodemonstratetheeffectivenessofthenoveladaptive–impulsivecontrolscheme.

  • 标签: 脉冲同步 混沌系统 自适应律 分数阶 局部LIPSCHITZ条件 LIPSCHITZ常数
  • 简介:Stimulatedemissiondepletion(STED)microscopyisoneoffar-fieldopticalmicroscopytechniquesthatcanprovidesub-diffractionspatialresolution.ThespatialresolutionoftheSTEDmicroscopyisdeterminedbythespeciallyengineeredbeamprofileofthedepletionbeamanditspower.However,thebeamprofileofthedepletionbeammaybedistortedduetoaberrationsofopticalsystemsandinhomogeneityofaspecimen’sopticalproperties,resultinginacompromisedspatialresolution.Thesituationgetsdeterioratedwhenthicksamplesareimaged.Intheworstcase,theseveredistortionofthedepletionbeamprofilemaycausecompletelossofthesuperresolutioneffectnomatterhowmuchdepletionpowerisappliedtospecimens.Previouslyseveraladaptiveopticsapproacheshavebeenexploredtocompensateaberrationsofsystemsandspecimens.However,itisdifficulttocorrectthecomplicatedhigh-orderopticalaberrationsofspecimens.Inthisreport,wedemonstratethatthecomplicateddistortedwavefrontfromathickphantomsamplecanbemeasuredbyusingthecoherentopticaladaptivetechnique.Thefullcorrectioncaneffectivelymaintainandimprovespatialresolutioninimagingthicksamples.

  • 标签:
  • 简介:Photonic-assistedmicrowavefrequencyidentificationwithdistinctfeatures,includingwidefrequencycoverageandfasttunability,hasbeenconceivedasakeytechniqueforapplicationssuchascognitiveradioanddynamicspectrumaccess.Theimplementationsbasedoncompactintegratedphotonicchipshaveexhibiteddistinctadvantagesinfootprintminiaturization,lightweight,andlowpowerconsumption,instarkcontrastwithdiscreteoptical-fiber-basedrealization.However,reportedchip-basedinstantaneousfrequencymeasurementscanonlyoperateatasingle-toneinput,whichstringentlylimitstheirpracticalapplicationsthatrequirewidebandidentificationcapabilityinmodernRFandmicrowaveapplications.Inthisarticle,wedemonstrate,forthefirsttime,awideband,adaptivemicrowavefrequencyidentificationsolutionbasedonasiliconphotonicintegratedchip,enablingtheidentificationofdifferenttypesofmicrowavesignalsfrom1to30GHz,includingsingle-frequency,multiple-frequency,chirped-frequency,andfrequency-hoppingmicrowavesignals,andeventheircombinations.ThekeycomponentisahighQ-factorscanningfilterbasedonasiliconmicroringresonator,whichisusedtoimplementfrequency-to-timemapping.Thisdemonstrationopensthedoortoamonolithicsiliconplatformthatmakespossibleawideband,adaptive,andhigh-speedsignalidentificationsubsystemwithahighresolutionandalowsize,weight,andpower(SWaP)formobileandavionicapplications.

  • 标签: WIDEBAND MICROWAVE IDENTIFICATION
  • 简介:Theradialplasmapositioncontrolisoneofthebasicplasmacontrolsoftokamak.Inordertomaintainaplasmacolumninthegeometricalcenterofitsvacuumvessel,theexternallyappliedverticalfield(VF)mustbeadjustedtothechangesintheplasmaparameterssuchastheplasmacurrent,poloidalbetaandtheinternalinductance.

  • 标签: HL-2A 等离子体 水平位移 模型参考 自适应控制 计算机仿真
  • 简介:Tofindtheoptimalroutingisalwaysanimportanttopicinwirelesssensornetworks(WSNs).ConsideringaWSNwherethenodeshavelimitedenergy,weproposeanovelEnergy*Delaymodelbasedonantalgorithms('E&DANTS'forshort)tominimizethetimedelayintransferringafixednumberofdatapacketsinanenergy-constrainedmannerinoneround.Ourgoalisnotonlytomaximizethelifetimeofthenetworkbutalsotoprovidereal-timedatatransmissionservices.However,becauseofthetradeoffofenergyanddelayinwirelessnetworksystems,thereinforcementlearning(RL)algorithmisintroducedtotrainthemodel.Inthissurvey,theparadigmofE&DANTSisexplicatedandcomparedtootherant-basedroutingalgorithmslikeAntNetandAntChainabouttheissuesofroutinginformation,routingoverheadandadaptation.SimulationresultsshowthatourmethodperformsaboutseventimesbetterthanAntNetandalsooutperformsAntChainbymorethan150%intermsofenergycostanddelayperround.

  • 标签: 计算机网络 信息素 能量消耗 无线电
  • 简介:Thispaperpresentsapressureobserverbasedadaptiverobustcontroller(POARC)forposturetrajectorytrackingofaparallelmanipulatordrivenbythreepneumaticmuscleswithoutpressuresensors.Duetomodelerrorsofthestaticforcesandfrictionforcesofpneumaticmuscles,simplifiedaverageflowratecharacteristicsofvalves,unknowndisturbancesofentiresystem,andunmeasuredpressures,thereexistrathersevereparametricuncertainties,nonlinearuncertaintiesanddynamicuncertaintiesinmodelingoftheparallelmanipulator.Anonlinearpressureobserverisconstructedtoestimateunknownpressuresonthebasisofasingle-input-single-output(SISO)decouplingmodelthatissimplifiedfromtheactualmultiple-input-multiple-output(MIMO)couplingmodeloftheparallelmanipulator.Then,anadaptiverobustcontrollerintegratedwiththepressureobserverisdevelopedtoaccomplishhighprecisionposturetrajectorytrackingoftheparallelmanipulator.TheexperimentalresultsindicatethatthesystemwiththeproposedPOARCnotonlyachievesgoodcontrolaccuracyandsmoothmovementbutalsomaintainsrobustnesstodisturbances.

  • 标签: 气压传动 平行操作 机械手 压力观测
  • 简介:Anadaptivemeshfiniteelementmodelhasbeendevelopedtopredictthecrackpropagationdirectionaswellastocalculatethestressintensityfactors(SIFs),underlinear-elasticassumptionformixedmodeloadingapplication.Thefiniteelementmeshisgeneratedusingtheadvancingfrontmethod.Inordertosuittherequirementsofthefractureanalysis,thegenerationofthebackgroundmeshandtheconstructionofsingularelementshavebeenaddedtothedevelopedprogram.Theadaptiveremeshingprocessiscarriedoutbasedontheposterioristresserrornormschemetoobtainanoptimalmesh.Previousworksoftheauthorshaveproposedtechniquesforadaptivemeshgenerationof2Dcrackedmodels.Facilitatedbythesingularelements,thedis-placementextrapolationtechniqueisemployedtocalculatetheSIF.Thefractureismodeledbythesplittingnodeapproachandthetrajectoryfollowsthesuccessivelinearextensionsofeachcrackincrement.TheSIFsvaluesfortwodifferentcasestudieswereestimatedandvalidatedbydirectcomparisonswithotherresearcherswork.

  • 标签: 应用力学 弹性疲劳 断裂现象 电池
  • 简介:Amulti-loopadaptiveinternalmodelcontrol(IMC)strategybasedonadynamicpartialleastsquares(PLS)frame-workisproposedtoaccountforplantmodelerrorscausedbyslowaging,driftinoperationalconditions,orenvironmentalchanges.SincePLSdecompositionstructureenablesmulti-loopcontrollerdesignwithinlatentspaces,amultivariableadaptivecontrolschemecanbeconvertedeasilyintoseveralindependentunivariablecontrolloopsinthePLSspace.Ineachlatentsubspace,oncethemodelerrorexceedsaspecificthreshold,onlineadaptationrulesareimplementedseparatelytocorrecttheplantmodelmismatchviaarecursiveleastsquares(RLS)algorithm.BecausetheIMCextractstheinverseoftheminimumpartoftheinternalmodelasitsstructure,theIMCcontrollerisself-tunedbyexplicitlyupdatingtheparameters,whicharepartsoftheinternalmodel.Bothparameterconvergenceandsystemstabilityarebrieflyanalyzed,andprovedtobeeffective.Finally,theproposedcontrolschemeistestedandevaluatedusingawidely-usedbenchmarkofamulti-inputmulti-output(MIMO)systemwithpuredelay.

  • 标签:
  • 简介:一个光陷井能在在一个光洞嵌入的一个ultracold原子系统由一块轻地被印,是众所周知的,并且由三块不同的协调的地开车。在光洞共存的三块地中,有一块强烈控制地,经由创造与联系Rabi频率的平方成正比的力量的一个周期的光栅栏的导致electromagnetically的透明性,和另一块地导致巨大的克尔非线性。在这,管理探查域的繁殖的非线性的方程的工作elliptic-soliton答案被考虑,与形成有明确的量数字的一个分离系列的光soliton火车的可能的产生上的强调。这个问题被对待假定周期的光栅栏的二种不同类型并且考虑否定并且detunings(detuning在上面或在回声下面)的正号。结果预言在自我阶段和跨阶段的调整非线性之间的比赛产生不同的量数字描绘的时间的soliton火车模式的一个富有的家庭。

  • 标签:
  • 简介:Withtherapidgrowthofwirelessbroadbandtechnologies,suchasWLANandWiMAX,qualitystreamingvideocontentsareavailablethroughportabledevicesanytime,anywhere.Thelayeredmulticastsystemusingscalablevideocodecshasbeenproposedasanefficientarchitectureforvideodisseminationtakingaccountofuserandlinkdiversities.However,inthewired/wirelesscombinedbest-effortbasedheterogeneousIPnetworkswhichprovidemorefluctuationinavailablebandwidthandend-to-enddelay,theperformanceofstreamingsystemshasbeengreatlydegradedduetofrequentpacketloss,resultingfromeitherwiredcongestionorwirelessfading/shadowing.Inthispaper,wepresentareal-timeembeddedpackettrainprobingschemeforestimatingend-to-endavailablebandwidthsoastoaccomplisheffectivecongestionanderrorcontrol.Thisisfacilitatedbyeffectiveclassificationofpacketlosssources,delaytrenddetectionalgorithmandflexibletransmissionrateofpackets.Undertheproperwirelesschannelmodellingandestimation,ourlayeredstructurecanallowappropriatesubscriptionofvideolayersandadaptivelyinsertnecessaryamountofforwarderrorcorrection(FEC)packetssoastoachieveQoSoptimizedsystemforscalablevideomulticasting.

  • 标签: Adaptive FEC Available BANDWIDTH estimation LAYERED