学科分类
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12 个结果
  • 简介:单个分子的梭连接是一个种nanoscale机电的通道系统。在这个连接,一个分子的岛震荡取决于它的充电职业,并且这充电依赖者摆动通过分子的岛导致电子通道的调整。这份报纸在单个分子的梭连接在当前的、射击噪音的学习和电子的decoherence上考察最近的开发。我们将用典型系统模型,在这个话题上给详细讨论理论充分量主人方程和Aharonov-Bohm干涉仪。

  • 标签: 散粒噪声 单分子 消相干 隧道系统 电子隧穿 |
  • 简介:连结积极反馈环,生物化学的系统的一块重要积木,能导致双稳态的切换,导致长持续的状态由简短刺激变化。在这个工作,在二种之间的流行相互的激活作为另一积极反馈被加到从许多现实主义的生物电路发源的一个通用连结positive-feedback-loop模型。积极反馈力量的一个随机的变化在反馈力量的双稳态的间隔被介绍,并且bistability在某个噪音水平为中等反馈力量出现。稳定性分析进一步基于势能风景被利用探索二个稳定的稳定的状态的导致噪音的切换行为。

  • 标签: 双稳态开关 切换 稳定性分析 噪音 景观 势能
  • 简介:为随机的珍视的噪音贿赂的deblurring图象,二阶段的方法首先仅仅与选择数据选择可能未来的reliables(没被随机的珍视的噪音贿赂的数据)然后deblur图象。然而,二阶段的方法经常引起有缺点的数据人工制品,它被混合数据的缺乏引起的失踪的数据人工制品和主要虚伪地选择的孤立点(被随机的珍视的噪音贿赂的数据)引起的吵闹的数据人工制品的结果。在这份报纸,压制这些有缺点的数据人工制品,我们建议一个变模糊的模型基于可靠选择的技术选择to-be-recovered象素值做所有贡献的尽可能许多选择了的reliables数据,当尽可能精确地排除孤立点时。我们也建议一种正规化技术在恢复象素价值补偿不一致的率。我们在Gaussian和斜deblurring上进行了模拟研究评估建议技术的表演。模拟结果证明那建议技术改进了二阶段的方法的性能,由有效地压制有缺点的数据人工制品。[从作者抽象]

  • 标签: 随机噪声 不良数据 去模糊 文物 图像 技术性能
  • 简介:TheeffectsofmagnituderoundingandofthepresenceofnoiseintheroundedmagnitudesontheestimationoftheGutenberg–Richterb-valueareexplored,andthewaystocorrectfortheseeffectsareproposed.Fortypicalvalues,b=1androundingintervalDM=0.1,theroundingerrorisapproximately-10-3anditcanbecorrectedtoanegligibleapproximately-10-5.Forthesametypicalvalues,theeffectofnoisecanbelarger,dependingonthecharacteristicsofthenoisedistribution;fornormallydistributednoisewithstandarddeviationr=0.1,thecorrectb-valuemaybeunderestimatedbyafactor*0.97.

  • 标签: 噪声分布 四舍五入 B值 校正 舍入误差 正态分布
  • 简介:Anideaofestimatingthedirectsequencespreadspectrum(DSSS)signalpseudo-noise(PN)sequenceispresented.WithouttheapriorityknowledgeabouttheDSSSsignalinthenon-cooperationcondition,weproposeaself-organizingfeaturemap(SOFM)neuralnetworkalgorithmtodetectandidentifythePNsequence.Anon-supervisedlearningalgorithmisproposedaccordingtheKohonenruleinSOFM.TheblindalgorithmcanalsoestimatethePNsequenceinalowsignal-to-noise(SNR)andcomputersimulationdemonstratesthatthealgorithmiseffective.Comparedwiththetraditionalcorrelationalgorithmbasedonslip-correlation,theproposedalgorithm’sbiterrorrate(BER)andcomplexityarelower.

  • 标签: 非监督学习算法 伪噪声序列 扩频信号 神经网络算法 自组织特征映射 KOHONEN
  • 简介:Objective:TodemonstratetheperformancebenefitoftheAutomaticSceneClassifier(SCAN)algorithmavailableintheNucleus6(CP900series)soundprocessoroverthedefaultprocessingalgorithmsofthepreviousgenerationNucleus5(CP810)andFreedomHybridTMsoundprocessors.Methods:Eighty-twocochlearimplantrecipients(40Nucleus5processorusersand42FreedomHybridprocessorusers)listenedtoandrepeatedAzBiosentencesinnoisewiththeircurrentprocessorandwiththeNucleus6processor.Results:TheSCANalgorithmwhenenabledyieldedstatisticallysignificantnon-inferiorandsuperiorperformancewhencomparedtotheNucleus5andFreedomHybridsoundprocessorsprogrammedwithASCtADRO.Conclusion:TheresultsofthesestudiesdemonstratethesuperiorperformanceandclinicalutilityoftheSCANalgorithmintheNucleus6processorovertheNucleus5andFreedomHybridprocessors.

  • 标签: 声音处理器 信号处理算法 噪声 2自由度 听力 扫描算法
  • 简介:Noisepollutionisamajorhazardousfactortohumanhealthandislikelyharmfulforvulnerablegroupssuchaspre-terminfantsunderlifesupportsysteminanintensivecareunit.Previousstudieshavesuggestedthatnoiseexposureimpairschildren’slearningabilityandcognitiveperformanceandcognitivefunctionsinanimalmodelsinwhichtheeffectismainlyattributedtotheoxidantstressofnoiseonthecognitivebrain.Thepotentialroleofnoiseinducedhearingloss(NIHL),ratherthantheoxidantstress,hasalsobeenindicatedbyadepressionofneurogenesisinthehippocampuslongafterabriefnoiseexposure,whichproducesonlyatentativeoxidantstress.ItisnotclearifnoiseexposureandNIHLduringearlydevelopmentexertsalongtermimpactoncognitivefunctionandneurogenesistowardsadulthood.Inthepresentstudy,abriefnoiseexposureathighsoundlevelwasperformedinneonatalC57BL/6Jmice(15daysafterbirth)toproduceasignificantamountofpermanenthearinglossasproved2monthsafterthenoise.Atthisage,thenoise-exposedanimalsshoweddeterioratedspatiallearningandmemoryabilitiesandareductionofhippocampalneurogenesisascomparedwiththecontrol.Theaveragedhearingthresholdwasfoundtobestronglycorrelatedwiththescoresforspatiallearningandmemory.Weconsidertheeffectsobservedarelargelyduetothelossofhearingsensitivity,ratherthantheoxidantstress,duetothelongintervalbetweennoiseexposureandtheobservations.

  • 标签: Noise induced HEARING LOSS NEONATAL mice
  • 简介:Olderadultsoftenfinditdifficulttoperceivespeech,especiallyinnoisyconditions.Thoughhearingaidisoneoftherehabilitativedevicesavailabletoolderadultstoalleviatehearingloss,someofthemmayexperienceannoyancethroughhearingaidandhencerejectit.maybeduetocircuitrynoiseand/orbackgroundnoise.Acceptablenoiselevelisadirectbehaviouralmeasuretoestimatetheextentofhowmuchapersonisabletoputupwithnoisewhilesimultaneouslylisteningtospeech.Acceptablenoiselevelisacentralauditorymeasureanditisnotinfluencedbyage.gender,presentationlevelorspeaker.Usingthismeasure,wecanquantifytheannoyancelevelexperiencedbyanindividual.Thisinformationisofutmostimportanceandcautionshouldbepaidbeforesettingtheparametersinhearingaid,especiallyforthosewhoareunabletoacceptnoise.Inthisreviewarticle,anattempthasbeenmadetodocumenthowtooptimizethehearingaidprogrambysettingparameterssuchasnoisereductioncircuit,microphonesensitivityandgain.Theseadjustmentsofparametersmighthelptoreducerejectionrateofhearingaids,especiallyinthoseindividualswhoareannoyedbybackgroundnoise.

  • 标签: ANNOYANCE Amplification Speech perception in noise