学科分类
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34 个结果
  • 简介:100piecesof26650-typeLithiumironphosphate(LiFePO4)batteriescycledwithafixedchargeanddischargeratearetested,andtheinfluenceofthebatteryinternalresistanceandtheinstantaneousvoltagedropatthestartofdischargeonthestateofhealth(SOH)isdiscussed.Abackpropagation(BP)neuralnetworkmodelusingadditionalmomentumisbuiltuptoestimatethestateofhealthofLi-ionbatteries.Theadditional10piecesareusedtoverifythefeasibilityoftheproposedmethod.Theresultsshowthattheneuralnetworkpredictionmodelhaveahigheraccuracyandcanbeembeddedintobatterymanagementsystem(BMS)toestimateSOHofLiFePO4Li-ionbatteries.

  • 标签: BP神经网络 状态估计 电池内阻 神经网络预测模型 LIFEPO4 锂离子电池
  • 简介:Handwrittensignaturerecognitionispresentedbasedonananglefeaturevectorbyusingtheartificialneuralnetwork(ANN)inthisresearch.Eachsignatureimagewillberepresentedbyananglevector.ThefeaturevectorwillconstitutetheinputtotheANN.Thecollectionofsignatureimagesisdividedintotwosets.OnesetwillbeusedfortrainingtheANNinasupervisedfashion.TheothersetwhichisneverseenbytheANNwillbeusedfortesting.Aftertraining,theANNwillbetestedbyrecognizingthesignatures.Whenasignatureisclassifiedcorrectly,itisconsideredcorrectrecognition,otherwiseitisafailure.Theachievedrecognitionrateofthissystemis94%.

  • 标签: 人工神经网络算法 离线签名识别 特性 特征向量 监督方式 ANN
  • 简介:Inthepresentstudy,artificialneuralnetwork(ANN)approachwasusedtopredictthestress–straincurveofnearbetatitaniumalloyasafunctionofvolumefractionsofaandb.Thisapproachistodevelopthebestpossiblecombinationorneuralnetwork(NN)topredictthestress–straincurve.Inordertoachievethis,threedifferentNNarchitectures(feed-forwardback-propagationnetwork,cascade-forwardback-propagationnetwork,andlayerrecurrentnetwork),threedifferenttransferfunctions(purelin,Log-Sigmoid,andTan-Sigmoid),numberofhiddenlayers(1and2),numberofneuronsinthehiddenlayer(s),anddifferenttrainingalgorithmswereemployed.ANNtrainingmodules,theloadintermsofstrain,andvolumefractionofaaretheinputsandthestressasanoutput.ANNsystemwastrainedusingthepreparedtrainingset(a,16%a,40%a,andbstress–straincurves).Aftertrainingprocess,testdatawereusedtochecksystemaccuracy.Itisobservedthatfeed-forwardback-propagationnetworkisthefastest,andLog-Sigmoidtransferfunctionisgivingthebestresults.Finally,layerrecurrentNNwithasinglehiddenlayerconsistsof11neurons,andLog-Sigmoidtransferfunctionusingtrainlmastrainingalgorithmisgivinggoodresult,andaveragerelativeerroris1.27±1.45%.Intwohiddenlayers,layerrecurrentNNconsistsof7neuronsineachhiddenlayerwithtrainrpasthetrainingalgorithmhavingthetransferfunctionofLogSigmoidwhichgivesbetterresults.Asaresult,theNNisfoundedsuccessfulforthepredictionofstress–straincurveofnearbtitaniumalloy.

  • 标签: 人工神经网络方法 应变曲线 曲线预测 Β钛合金 应力 反向传播网络
  • 简介:Inthispaper,weproposetwoweightedlearningmethodsfortheconstructionofsinglehiddenlayerfeedforwardneuralnetworks.Bothmethodsincorporateweightedleastsquares.Ourideaistoallowthetraininginstancesnearertothequerytoofferbiggercontributionstotheestimatedoutput.Byminimizingtheweightedmeansquareerrorfunction,optimalnetworkscanbeobtained.Theresultsofanumberofexperimentsdemonstratetheeffectivenessofourproposedmethods.

  • 标签: 单隐层前馈神经网络 加权最小二乘 学习方法 误差函数 最小化 查询
  • 简介:OnbehalfoftheEditors-in-ChiefandEditorialBoard,wewishtoexpressourgratitudetothefollowing'anonymous'reviewerswhogavetheirtimeandenergyforreviewingthearticles(eitherpublishedorrejected)fromJanuary1,2014,throughDecember31,2014,ensuringthequalityofNeuralRegenerationResearch.

  • 标签: 神经再生 评审 编委会
  • 简介:Neurodegenerativedisordersaffectmorethan30millionindividualsthroughouttheworldandleadtosignificantdisabilityaswellasdeath.Thesestatisticswillincreasealmostexponentiallyasthelifespanandageofindividualsincreasegloballyandindividualsbecomemoresusceptibletoacutedisorderssuchasstrokeaswellaschronicdiseasesthatinvolvecognitiveloss,Alzheimer’sdisease,andParkinson’sdisease.Currenttherapiesforsuchdisordersareeffectiveonlyforasmallsubsetofindividualsorprovidesymptomaticreliefbutdonotalterdiseaseprogression.Oneexcitingtherapeuticapproachthatmayturnthetideforaddressingneurodegenerativedisordersinvolvesthemammaliantargetofrapamycin(mTOR).mTORisacomponentoftheproteincomplexesmTORComplex1(mTORC1)andmTORComplex2(mTORC2)thatareubiquitousthroughoutthebodyandcontrolmultiplefunctionssuchasgenetranscription,metabolism,cellsurvival,andcellsenescence.mTORthroughitsrelationshipwithphosphoinositide3-kinase(PI3-K)andproteinkinaseB(Akt)andmultipledownstreamsignalingpathwayssuchasp70ribosomalS6kinase(p70S6K)andprolinerichAktsubstrate40kDa(PRAS40)promotesneuronalcellregenerationthroughstemcellrenewalandoverseescriticalpathwayssuchasapoptosis,autophagy,andnecroptosistofosterprotectionagainstneurodegenerativedisorders.TargetingbymTORofspecificpathwaysthatdrivelong-termpotentiation,synapticplasticity,andβ-amyloidtoxicitymayoffernewstrategiesfordisorderssuchasstrokeandAlzheimer’sdisease.Overall,mTORisanessentialneuroprotectivepathwaybutmustbecarefullytargetedtomaximizeclinicalefficacyandeliminateanyclinicaltoxicsideeffects.

  • 标签: 神经再生 目标驱动 哺乳动物 雷帕霉素 神经退行性疾病 阿尔茨海默氏病
  • 简介:Vehielesenlistedwitheomputing,sensingandcommunicatingdevicescancreatevehicularnetworks,asubsetofcooperativesystemsinheterogeneousenvironments,aimingatimprovingsafetyandentertainmentintraffic.Invehicularnetworks,avehicle’sidentityisassociatedtoitsowner’sidentityasauniquelinkage.Therefore,itisofimportancetoprotectprivacyofvehiclesfrombeingpossiblytracked.Obviously,theprivacyprotectionmustbescalablebecauseofthehighmobilityandlargepopulationofvehicles.Inthiswork,wetakeanon-trivialsteptowardsprotectingprivacyofvehicles.Asprivacydrawspublicconcerns,wefirstlypresentprivacyimplicationsofoperationalchallengesfromthepublicpolicyperspective.Additionally,weenvisionvehicularnetworksasgeographicallypartitionedsubnetworks(cells).Eachsubnetworkmaintainsalistofpseudonyms.Eachpseudonymincludesthecell’sgeographicidandarandomnumberashostid.Beforestartingcommunication,vehiclesneedtorequestapseudonymondemandfrompseudonymserver.Inordertoimproveutilizationofpseudonyms,weaddressastochasticmodelwithtime-varyingarrivalanddeparturerates.Ourmaincontributionincludes:1)proposingascalableandeffectivealgorithmtoprotectprivacy;2)providinganalyticalresultsofprobability,varianceandexpectednumberofrequestsonpseudonymservers.Theempiricalresultsconfirmtheaccuracyofouranalyticalpredictions.

  • 标签: 隐私保护 车载网络 可扩展性 通信设备 异构环境 合作系统
  • 简介:Networktrafficclassificationaimsatidentifyingtheapplicationtypesofnetworkpackets.ItisimportantforInternetserviceproviders(ISPs)tomanagebandwidthresourcesandensurethequalityofservicefordifferentnetworkapplications.However,mostclassificationtechniquesusingmachinelearningonlyfocusonhighflowaccuracyandignorebyteaccuracy.TheclassifierwouldobtainlowclassificationperformanceforelephantflowsastheimbalancebetweenelephantflowsandmiceflowsonInternet.Theelephantflows,however,consumemuchmorebandwidththanmiceflows.Whentheclassifierisdeployedfortrafficpolicing,thenetworkmanagementsystemcannotpenalizeelephantflowsandavoidnetworkcongestioneffectively.Thisarticleexploresthefactorsrelatedtolowbyteaccuracy,andsecondly,itpresentsanewtrafficclassificationmethodtoimprovebyteaccuracyattheaidofdatacleaning.Experimentsarecarriedoutonthreegroupsofreal-worldtrafficdatasets,andthemethodiscomparedwithexistingworkontheperformanceofimprovingbyteaccuracy.Experimentshowsthatbyteaccuracyincreasedbyabout22.31%onaverage.Themethodoutperformstheexistingoneinmostcases.

  • 标签: 分类方法 网络流量 数据清洗 网络管理系统 高流动性 服务提供商
  • 简介:Theadventofthetimeofbigdataalongwithsocialnetworksmakesthevisualizationandanalysisofnetworksinformationbecomeincreasinglyimportantinmanyfields.Basedontheinformationfromsocialnetworks,theideaofinformationvisualizationanddevelopmentoftoolsarepresented.Popularsocialnetworkmicro-blog(‘Weibo’)ischosentorealizetheprocessofusers’interestandcommunicationsdataanalysis.Userinterestvisualizationmethodsarediscussedandchosenandprogramsaredevelopedtocollectusers’interestanddescribeitbygraph.Thevisualizationresultsmaybeusedtoprovidethecommercialrecommendationorsocialinvestigationapplicationfordecisionmakers.

  • 标签: 信息可视化 社会网络 图谱 用户兴趣 网络信息 可视化方法
  • 简介:Intheenvironmentofheterogeneouswirelessnetworks,itisvitaltoselectacurrentlyoptimalnetworkforapplicationsandsubscribers.Theuseofmultipleattributedecisionmaking(MADM)forheterogeneousnetworkselectioncanprovidesubscriberswithsatisfactoryservicequality.ConvertingheterogeneousnetworkselectionintoaMADMproblem,theauthorspresentanimprovedalgorithmforMADMbasedongroupdecisiontheory.Thealgorithmcombinesweightvectorsofmultipleattributedecisionmakingtoobtainacombinationalweightvector.Thentheresults’compatibilitywillbeassessed.Iftheydonotmeettherequirementsofcompatibility,thejudgmentmatrixwillbemodifieduntilacomprehensivevectorthatsatisfiescompatibilityrequirementsisproduced.Thevectoriscombinedwithsimpleweightingmethod(SAW)fornetworkselection.Simulationshowsthatthealgorithmcanprovideuserswithsatisfactoryqualityofservice(QoS).

  • 标签: 异构无线网络 选择算法 多属性决策问题 群决策 网络选择 服务质量
  • 简介:Aseachtypeofsatellitenetworkhasdifferentlinkfeatures,itsdatatransmissionmustbedesignedbasedonitslinkfeaturestoimprovetheefficiencyofdatatransferring.Thetransmissionofnavigationintegratedservicesinformation(NISI)inaglobalnavigationsatellitesystem(GNSS)withinter-satellitelinks(ISLs)isstudiedbytakingtherealsituationofinter-satellitecommunicationlinksintoaccount.Anon-demandcomputingandbufferingcentralizedroutestrategyisproposedbasedondynamicgroupingandthetopologyevolutionlawoftheGNSSnetworkwithinwhichthesatellitenodesareoperatedinthemannerofdynamicgrouping.Dynamicgroupingisbasedonsatellitesspatialrelationshipsandthegrouproleofthesatellitenodechangesbyturnsduetoitsspatialrelationships.Theroutestrategyprovidessignificantadvantagesofhighefficiency,lowcomplexity,andflexibleconfiguration,bywhichtheestablishedGNSScanpossessthefeaturesandcapabilitiesoffeasibledeployment,efficienttransmission,convenientmanagement,structuralinvulnerabilityandflexibleexpansion.

  • 标签: 全球导航卫星系统 网络拓扑结构 卫星网络 路由策略 演化规律 卫星间链路
  • 简介:Modulatingboththeclockfrequencyandsupplyvoltageofthenetwork-on-chip(NoC)duringruntimecanreducethepowerconsumptionandheatflux,butwillleadtotheincreaseofthelatencyofNoC.Itisnecessarytofindatradeoffbetweenpowerconsumptionandcommunicationlatency.Soweproposeananalyticallatencymodelwhichcanshowustherelationshipofthem.TheproposedmodeltoanalyzelatencyisbasedontheM/G/1queuingmodel,whichissuitablefordynamicfrequencyscaling.Theexperimentresultsshowthattheaccuracyofthismodelismorethan90%.

  • 标签: 延迟模型 频率调节 网络级 电源电压 时钟频率 等待时间