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295 个结果
  • 简介:Averysimpleschemeispresentedforteleportinganunknownfrequencystatewiththesuccessfulprobabilityof50%.Twoacoustic-opticalmodulatorsandfournarrowbandphotodetectorsintheproposedschemeareused.OneadvantageofourschemeisthatnoBell-statemeasurementisneedandnoanyunitarytransformationisperformed.

  • 标签: 量子远距传输 频率纠缠 光调节器 量子系统
  • 简介:这篇文章学习多限制最少费用多点传送在在稠密的波长部门multiplexing(IP/DWDM)上的因特网协议的路由问题联网。处理这个问题,individual-difference-based量基因算法(IDQGA)被建议。这个算法由介绍一个适应旋转角度步决心计划和基于组的量变化操作在染色体之中考虑单个差别。模拟在网络拓扑学上被进行。结果显示与另外的启发式的算法相比,IDQGA在解决服务(QoS)的质量上有更好最佳的性能多点传送在IP/DWDM网络的路由问题并且被强壮的坚韧性,高成功比率和优秀能力在全球寻找上描绘。

  • 标签: 因特网协议 波分复用技术 多点传送 服务质量 量子遗传算法
  • 简介:TheHamiltonianformulationsofthelinear'good'Boussinesq(L.G.B.)equationandthemulti-symplecticformulationofthenonlinear'good'Boussinesq(N.G.B.)equationareconsidered.Forthemulti-symplecticformulation,anewfifteen-pointdifferenceschemewhichisequivalenttothemulti-symplecticPreissmannintegratorisderived.Wealsopresentnumericalexperiments,whichshowthatthesymplecticandmultisymplecticschemeshaveexcellentlong-timenumericalbehavior.

  • 标签: 多辛概型 非线性Boussinesq方程 Hamiltonian公式 非线性偏微分方程
  • 简介:Thecompressedsensing(CS)ofaccelerationdatahasbeendrawingincreasingattentioningaittelemonitoringapplication.Insuchapplication,therestillexistsomechallengingissuesincludinghighenergyconsumptionofbody-worndeviceforaccelerationdataacquisitionandthepoorreconstructionperformanceduetononsparsityofaccelerationdata.Thus,thenovelschemeofcompressivesensingofaccelerationdataisneededurgentlyforsolutionsthatarefoundtotheseissues.

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  • 简介:Spectrumsensingisoneofthecoretechnologiesforcognitiveradios(CR),wherereliabledetectionofthesignalsofprimaryusers(PUs)ispreconditionforimplementingtheCRsystems.AcooperativespectrumsensingschemebasedonanadaptivedecisionfusionalgorithmforspectrumsensinginCRisproposedinthispaper.ThisschemecanestimatethePUpriorprobabilityandthemissdetectionandfalsealarmprobabilitiesofvarioussecondaryusers(SU),andmakethelocaldecisionwiththeChair-Varshneyrulesothatthedecisionsfusioncanbedonefortheglobaldecision.SimulationresultsshowthatthefalsealarmandmissdetectionprobabilitiesresultedfromtheproposedalgorithmaresignificantlylowerthanthoseofthesingleSU,andtheperformanceoftheschemeoutperformsthatofthecooperativedetectionbyusingtheconventionaldecisionfusionalgorithms.

  • 标签: 自适应决策 融合算法 谱检测 合作 CR系统 先验概率
  • 简介:Anewalternatingdirection(AD)finiteelement(FE)schemefor3-dimensionalnonlinearparabolicequationandparabolicintegro-differentialequationisstudied.ByusingAD,the3-dimensionalproblemisreducedtoafamilyofsinglespacevariableproblems,calculationworkissimplified;byusingFE,highaccuracyiskept;byusingvarioustechniquesforprioriestimatefordifferentialequationssuchasinductivehypothesisreasoning,thedifficultyarisingfromthenonlinearityistreated.ForbothFEandADFEschemes,theconvergencepropertiesarerigorouslydemonstrated,theoptimalH1-andL2-normspaceestimatesandtheO((△t)2)estimatefortimevariableareobtained.

  • 标签: nonlinear PARABOLIC equation ALTERNATING
  • 简介:Anewfairoff-lineelectroniccashschemeonellipticcurvecryptographywaspresented.Thenewschemeismoreefficientthanthosebyextendingfairoff-lineelectroniccashschemefromfinitefieldintoellipticcurvecryptographyandintroducinganewellipticcurvediscretelogarithmassumption.Theexpirydateanddenominationareembeddedintotheblindlysignedcoinbyintegratingpartiallyblindsignaturewithrestrictiveblindsignature.Abankneednotusedifferentpublickeysfordifferentcoinvalues,shopsandusersneednotcarryalistofbank'spublickeystoverifyintheirelectronicwallet.Atthesametime,thebankjustneedstokeepundueelectroniccoinsfordoublespendingcheckinhisdatabase,thusbank'sdatabasecanbedramaticallyreduced.

  • 标签: 部分签名 限制性签名 椭圆曲线密码系统 电子货币
  • 简介:AllwatermarksaresharedintoshadowimagesusingVCS(VisualCryptographyScheme).Onlyonespecificshadow(asanewwatermark)isembeddedintothehostsignalandtheotheronesaredistributedtoeveryuserineachgroupasakey.Inthewatermarkingextractionprocedure,usersindifferentgroupcanobtaindifferentwatermarkbycombiningtheirshadowswiththeextractedonefromthewatermarkedsignal.Analysisandexperimentalresultsshowthatthenewwatermarkingmethodisnovel,secureandrobust.

  • 标签: 数字水印 视觉密码 VCS 阴影图像
  • 简介:我们为经由公共密钥的密码学在二个合法聚会(鲍勃和艾莉斯)之间分享的信息建议一个协议。特别地,我们由采用分离算法在下面专业化协议现代派那经由光子旋转印射整数到量状态。基于这个算法,我们发现协议在攻击的各种各样的班下面是安全的。特殊,欠到算法,在公共密钥的量和相应密文包含的古典隐私的安全被保证。并且协议由设计特别检查对扮演攻击和活跃wiretapping攻击是柔韧的处理,这样协议是有效的。

  • 标签: 离散算法 量子态 信息 共享 加密协议 安全攻击
  • 简介:TheuseoftheLaserMegaJoulefacilitywithintheshockignitionschemehasbeenconsidered.Inthefirstpartofthestudy,one-dimensionalhydrodynamiccalculationswereperformedforaninertialconfinementfusioncapsuleinthecontextoftheshockignitionschemeprovidingtheenergygainandanestimationoftheincreaseofthepeakpowerduetothereductionofthephotonpenetrationexpectedduringthehigh-intensityspikepulse.Inthesecondpart,weconsideredaLaserMegaJouleconfigurationconsistingof176laserbeamsthathavebeengroupedprovidingtwodifferentirradiationschemes.Inthisconfigurationthemaximumavailableenergyandpowerare1.3MJand440TW.Optimizationofthelaser–capsuleparametersthatminimizetheirradiationnon-uniformityduringthefirstfewnsofthefootpulsehasbeenperformed.ThecalculationstakeintoaccountthespecificellipticallaserintensityprofileprovidedattheLaserMegaJouleandtheexpectedbeamuncertainties.Asignificantimprovementoftheilluminationuniformityprovidedbythepolardirectdrivetechniquehasbeendemonstrated.Three-dimensionalhydrodynamiccalculationshavebeenperformedinordertoanalysethemagnitudeoftheazimuthalcomponentoftheirradiationthatisneglectedintwodimensionalhydrodynamicsimulations.

  • 标签: INERTIAL CONFINEMENT fusion shock IGNITION LASER
  • 简介:认知收音机(CR)技术被相信改进光谱效率。然而,干扰问题由于主要系统和CR系统的共存成为了一个关键问题。在这份报纸,在CR的干扰基于细胞的网络被讨论。干扰情形被分析,考虑到不同干扰采购原料。同时,一个改进模型说出认知干扰戒指被介绍描述每个第二等的用户(苏)的干扰范围。取决于上述分析,图着色基于动态力量分配(GCDPA)计划为干扰被建议回避。模拟结果证明那在CR基于细胞的网络,到主要用户(脓)的干扰能有效地与建议GCDPA计划,和系统产量和力量效率被减轻两个都被改进。

  • 标签: 干扰问题 认知无线电 蜂窝网络 CR系统 高频谱效率 功率分配
  • 简介:ThispaperpresentsasimpleandrobustspeedcontrolschemeofPermanentMagnetSynchronousMotor(PMSM).Itistoachieveaccuratecontrolpeffommancemthepresenceofloadtorqueandplantparametervariation.Arobustdisturbancecancellationfeedforwardcontrollerisusedtoestimatethetorquedisturbance.ThesimpleandpracticalcontrolschemeiseasilyimplementedonaPMSMdriverusingaTMS320LF2407DSP.Theeffectivenessoftheproposedrobustspeedcontrolapproachisdemonstratedbysimulationandexperimentalresults.

  • 标签: PMSM 转矩脉动 速度控制 前馈控制
  • 简介:Afamilyofarraycodeswithamaximumdistanceseparable(MDS)property,namedLcodes,isproposed.ThegreateststrengthofLcodesisthatthenumberofrows(columns)inadiskarraydoesnotberestrictedbytheprimenumber,andmorediskscanbedynamicallyappendedinarunningstoragesystem.Lcodescantolerateatleasttwodiskerasuresandsomesectorlosssimultaneously,andcantoleratemultiplediskerasures(greaterthanorequaltothree)underacertaincondition.BecauseonlyXORoperationsareneededintheprocessofencodinganddecoding,LcodeshaveveryhighcomputingefficiencywhichisroughlyequivalenttoXcodes.AnalysisshowsthatLcodesareparticularlysuitableforlarge-scalestoragesystems.

  • 标签: 磁盘阵列 存储系统 编码方案 最大距离可分码 计算效率 MDS
  • 简介:AFourierspectralschemeisproposedforsolvingtheperiodicproblemofnonlinearKlein-Gordonequation.Itsstabilityandconvergenceareinvestigated.Numericalresultsarealsopresented.

  • 标签: FOURIER SPECTRAL SCHEME KLEIN-GORDON equation.
  • 简介:Thispaperconsiderstheone-dimensionaldissipativecubicnonlinearSchrdingerequationwithzeroDirichletboundaryconditionsonaboundeddomain.Theequationisdiscretizedintimebyalinearimplicitthree-levelcentraldifferencescheme,whichhasanalogousdiscreteconservationlawsofchargeandenergy.Theconvergencewithtwoordersandthestabilityoftheschemeareanalysedusingaprioriestimates.Numericaltestsshowthatthethree-levelschemeismoreefficient.

  • 标签: 非线性方程 中心差分格式 DIRICHLET边界条件 耗散 电荷守恒定律 能量离散
  • 简介:我们在场为在热洞证完的任意的N原子州的withoutBell状态大小的远距传物的一个计划,和表演在实验的可行性。我们对两洞腐烂感觉迟钝、热的计划isalso成立了,并且远距传物的忠实被试验性的错误onlyslightly影响。另外,成功概率到达1.0。

  • 标签: 热空穴 原子状态 隐形传输 可行形