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500 个结果
  • 简介:Thedistributedcomputersystemdescribedinthispaperisasetofcomputernodesinterconnectedinaninterconnectionnetworkviapacket-switchinginterfaces.Thenodescommunicatewitheachotherbymeansofmessage-passingprotocols.Thispaperpresentstheimplementationofrendezvousfacilitiesashigh-levelprimitivesprovidedbyaparallelprogramminglanguagetosupportinterprocesscommunicationandsynchronization.

  • 标签: 分布计算机系统 互连网 程序设计语言
  • 简介:DiscreteFourierTransform(DFT)basedmultiple-inputmultiple-outputOrthogonalFrequencyDivisionMultiplexing(MIMO-OFDM)isthefocusofwirelesscommunication,whichusescyclicprefixestoreducetheISI.Toimprovethespectrumefficiencyandsystemperformance,ComplexWaveletPacketTransform(CWPT)basedOFDMisusedtorealizetheMIMO-OFDMsystem.Forthegoodpropertyofcomplexwaveletpacketfunction,theCWPTbasedMIMO-OFDMsystemisbetterthantheDFTbasedMIMO-OFDMsystem,buttheCWPTbasedMIMO-OFDMschemehassomeadditionalcomplexity,andsimulationresultsshowthatthenewsystemcanimprovethesystemperformance.

  • 标签: MIMO COMPLEX WAVELET PACKET OFDM
  • 简介:TheElectromagneticCompatibilityandDistributionofAntennaSystem¥B.FWang;S.Z.adns&Y.L.Yao(Dept.ofElect.Eng.,BeijingUniversityofA...

  • 标签: ELECTROMAGNETIC compatibility DISTRIBUTION of ANTENNAS AIRCRAFT
  • 简介:Greysequencegenerationcandrawoutanddevelopimpliedrulesoftheoriginaldata.Differentkindsofgenerationmethodsweresummarizedandclassifiedintotwotypes:partialgenerationandwholegeneration.Theaveragegenerationandstepwiseratiogenerationisdisussed,thepreferencegenerationisregardasaspecialcaseofproportionaldivisionbasedonanalysisgeometrictheory,proposeanideaofusingconcaveandconvexstatusofdiscretedatatodeterminethegenerationcoefficient.Basedonthestepwiseandsmoothratiogeneration,atendencyaveragegenerationisproposedandhaveacomparisonusingthedataprovidedinpaperslistedinthereferences.Thecomparisonprovesthatthenewgenerationisbetterthantheothertwogenerationsanderrorsareobviouslyreduced.

  • 标签: 灰色系统 数据序列 平均产生 原始数据
  • 简介:Thispaperintroducesthemostadvancedformofelectronicchartdisplayandinformationsystems(ECDIS)whichcomplieswiththePerformanceStandardsforECDISestablishedbytheInternationalMaritimeOrganization(IMO)andtheInternationalHydrographicOrganization(IHO).ItalsodescribesthekeyfeaturesandtheimportantfunctionsofECDIS.ThenthefuturedevelopmentofECDISinmarineisdiscussed.

  • 标签: 计算机图形学 电子图表显示 信息系统
  • 简介:有0被证明的部分拉普拉斯算符(−Δ)α/2,α>的抛物线的系统的一个答案的存在,这个答案沿着去无穷的不同时间序列以不同的率腐烂。作为一个应用程序,概括海军司烧方程的一个答案的存在被证明去无穷的序列,它沿着不同时间以不同的率腐烂。概括海军司烧方程是源于在海军司烧方程代替−Δ由的方程(−Δ)m,m>0。最后,3-D的类似的结果不可压缩的各向异性的海军司烧系统被获得。

  • 标签: 拉普拉斯 抛物系统 STOKES方程 分数 时间序列 kes系统
  • 简介:Inthispaper,theauthorsintroduceandstudysystemofgeneralizedvectorvariationalinequalities.Undersuitableconditions,theexistenceofsolutionsforsystemofgeneralizedvectorvariationalinequalitiesispresentedbyKakutani-Fan-Glicksbergfixedpointtheorem.

  • 标签: 广义向量 不等式 假单调映射 KKM映射 定点理论
  • 简介:Theissueofimpulsivesynchronizationofthecoupledchaoticlaserplasmasystemisinvestigated.Anewframeworkforimpulsivesynchronizationofsuchchaoticsystemsispresented,whichmakesthesynchronizationerrorsystemalinearimpulsivecontrolsystem.Wederivesomesufficientconditionsforthesynchronizationofalaserplasmasystemviaimpulsivecontrolwiththevaryingimpulsiveintervals,whichallowsustoderivetheimpulsivesynchronizationlaweasily.Toillustratetheeffectivenessoftheproposedresults,twonumericalexamplesaregiven.

  • 标签: 激光等离子体系统 脉冲同步 混沌 稳定性
  • 简介:Theautomaticdetectionoffacesisaveryimportantproblem.Theeffectivenessofbiometricauthenticationbasedonfacemainlydependsonthemethodusedtolocatethefaceintheimage.Thispaperpresentsahybridsystemforfacesdetectioninunconstrainedcasesinwhichtheillumination,pose,occlusion,andsizeofthefaceareuncontrolled.Todothis,thenewmethodofdetectionproposedinthispaperisbasedprimarilyonatechniqueofautomaticlearningbyusingthedecisionofthreeneuralnetworks,atechniqueofenergycompactionbyusingthediscretecosinetransform,andatechniqueofsegmentationbythecolorofhumanskin.Awholeofpictures(facesandnofaces)aretransformedtovectorsofdatawhichwillbeusedforlearningtheneuralnetworkstoseparatebetweenthetwoclasses.Discretecosinetransformisusedtoreducethedimensionofthevectors,toeliminatetheredundanciesofinformation,andtostoreonlytheusefulinformationinaminimumnumberofcoefficientswhilethesegmentationisusedtoreducethespaceofresearchintheimage.Theexperimentalresultshaveshownthatthishybridizationofmethodswillgiveaverysignificantimprovementoftherateoftherecognition,qualityofdetection,andthetimeofexecution.

  • 标签: 混合动力系统 侦测 自动检测功能 离散余弦变换 鲁棒 人脸图像
  • 简介:FBSNG[1]isaredesignedversionofFarmBatchSystem(FBS[1]),whichwasdevelopedasabatchprocessmanagementsystemforoff-lineRunIIdataprocessingatFNAL.FBSNGisdesignedforUNIXcomputerfarmsandiscapableofmanagingupto1000nodesinasinglefarm.FBSNGallowsuserstostartarraysofparallelprocessesononeormorefarmcomputers,Itusesasimplifiedabstractresourcecountingmethodforloadbalancingbetweencomputers.TheresourcecountingapproachallowsFBSNGtobeasimpleandflexibletoolforfarmresourcemanagement.FBSNGschedulerfeaturesincludeguaranteedandcontrollable”fair-share”scheduling.FBSNGiseasilyportableacrossdifferentflavorsofUNIX.ThesystemhasbeensuccessfullyusedatFermilabaswellasbyoff-sitecollaboratorsforseveralyearsonfarmsofdifferentsizesanddifferentplatformsforoff-linedataprocessing,Monte-Carlodatagenerationandothertasks.

  • 标签: 实验 软件Farm 数据处理系统 PC聚类
  • 简介:ByusingthegeneralizedPoincaréindextheoremitisprovedthatifthen^2criticalpointsofann-polynomialsystemformaconfigurationoftype(2n-1)-(2n-3)+(2n-5)-…+(-1)^n-1,andthe2n-1outmostanti-saddlesformtheverticesofaconvex(2n-1)-polygon,thenamongthese2n-1anti-saddlesatleastonemustbeanode.

  • 标签: 立方多项式微分 反鞍 指数定理 赤道 临界点 半球