简介:为了在焊接缺点有效地减少噪音,想象并且保存琐事信息,基于nonsubsampledcontourlet变换(NSCT)焊接缺点图象的一个噪音减小方法和各向异性的散开被建议。第一,焊接缺点图象的X光检查被NSCT分解。然后全部的变化(电视)模型和Catte_PM模型分别地被用于获得的低通行证的部件和通带部件。最后,降噪的图象被反的NSCT综合。试验性的结果显示出那,与有电视散开和适应对比散开的小浪阀值收缩的混合方法相比,建议方法在主观视觉效果的方面有大改进,山峰signal-to-noise比率(PSNR)和吝啬平方的错误(MSE)。噪音更有效地被压制,琐事信息在图象更好被保存。
简介:A0.18lmCMOSlownoiseamplifier(LNA)byutilizingnoise-cancelingtechniquewasdesignedandimplementedinthispaper.Current-reuseandself-biastechniqueswereusedinthefirststagetoachieveinputmatchingandreducepowerconsumption.ThecoresizeoftheproposedCMOSLNAcircuitwithoutinductorwasonly128lm9226lm.ThemeasuredpowergainandnoisefigureoftheproposedLNAwere20.6and1.9dB,respectively.The3-dBbandwidthcoversfrequencyfrom0.1to1.2GHz.Whenthechipwasoperatedatasupplyvoltageof1.8V,itconsumed25.69mW.ThehighperformanceoftheproposedLNAmakesitsuitableformultistandardlow-costreceiverfront-endswithintheabovefrequencyrange.
简介:<正>Background:Stochasticresonancestimulation(SRS)transmitssubsensoryelectricalGaussianwhitenoiseintothebodytoenhancesensorimotorfunction.Thistherapyhasimprovedstaticsinglelegbalanceinsubjectswithfunctionalankleinstability.However,theeffectofthisstimulationondynamicsinglelegbalanceisnotknown.ImprovementsindynamicsinglelegbalancewithSRSmayhaveimplicationsForenhancingfunctionalrehabilitationforankleinstability.Thus,thepurposeofthisstudywastodeterminetheeffectsofSRSondynamicsinglelegbalanceinsubjectswithfunctionalankleinstability.Methods:Thisstudywasanexperimentalresearchdesignanddatawerecollectedinasportsmedicineresearchlaboratory.Twelvesubjectswithfunctionalankleinstability(69±15kg;173±10cm;21±2years)reportedahistoryofanklesprainsandinstabilityattheanklewithphysicalactivity.Asinglelegjump-landingtestwasusedtoassessdynamicbalance.Subjectswererequiredtojumpbetween50%and55%ofthemaximalverticaljumpheight,landonasinglelegatopaforceplate,andstabilizeasquicklyaspossible.Jump-landingtestswereperformedwithandwithoutSRS.Threetrialswereperformedforeachtreatmentcondition(SRSandcontrol).Arandomizedblockdesignwasusedtodeterminetestorder.Anterior/posteriorandmedial/lateraltime-to-stabilizationwerecomputedtoassessdynamicbalance.Lessertimeindicatedbetterstability.One-tailedpairedsamplesttestswereusedforanalysis(α≤0.05).Results:SRSimprovedanterior/posteriortime-to-stabilization(stochasticresonance=1.32±0.31s,control=1.74±0.80s,p=0.03),butdidnotenhancemedial/lateraltime-to-stabilization(stochasticresonance=1.95±0.40s,control=1.92±0.48s,p=0.07).Conclusion:CliniciansmightuseSRStofacilitatebalanceimprovementswithsagittalplanedynamicsinglelegbalanceexercisesthatpatientsmaynotbeabletoperformotherwise.