简介：Amethodforimageencryptionusinga1-Djointtransformcorrelatorisdescribed.Byuseoflinefunctions,a2-Dobjectisencryptedfirstinonedirection,thenintheperpendiculardirection.Theprincipleofthemethodandexperimentalresultsaregiven.

简介：隐私是在电子投票的一个重要问题。在电子投票的完整的隐私的概念第一被建议，不是仅仅选民的隐私被担心，而且候选人的。没有任何信任第三方，保存电子选举建筑学的隐私被介绍，为k-out-of-m选举的一种一般技术也基于分布式的ElGamal加密和混合火柴被提供。没有揭示他们的愿望和输的候选人的投票，选民能自己计算结果。而且，获胜者候选人的投票是否多于一半，能直接被验证。这个计划满足投票并且去模式并且完成完整的隐私。正确性和安全也被分析。

简介：ThispaperdescribesafullchannelTVmodulatorforallTVsystems,whichhasbeendevelopedsuccessfully.ItemploysadvancedtechniquesuchasPLLfrequencysynthesizerwithmicrowaveintegratedcircuit,andwidebandmicrostripVCOanddigital-analogcombinedintegratedcircuits.Thekeytechniqueofthemodulatorissettledsuccessfully.AllthespecificationsofthemodulatoragreewithTechnicalStandardofChina,whicharetestedbytheauthorityofChina.

简介：AkindofDynamicFullBandwidthUtilized(DFBU)allocationalgorithmisintroduced.Thisalgorithmallowsasinglelinktousebandwidthfarbeyonditsfairsharebandwidthinamulti-servicepackettransportingsystem.Threeimportantparametersastheboundonmaximumandminimumbandwidth,themaximumpacketdelayandtheminimumbandwidthutilizationarediscussedandanalyzed.ResultsofexperimentsshowthattheDFBU-algorithmiscapableofmakingasinglelinkinthesystemtouseallthesparebandwidth(uptofull-bandwidth)whiletheperformanceoffairnessandQoSrequirementisstillguaranteed.

简介：AnewFB-ZVT-PWMconverterisproposed.ThenewconverteroperatesatafixedfrequencyandimplementsZVSforpowerdeviceswithoutincreasingvoltageinbothturn-onandturn-offtransient.A80kHz/50WFB-ZVT-PWMboostconverterusingMOSFETsisanalysedtheoretically.

简介：Theerrorperformanceofcontimuonsphasemodulation(CPM)withtheoptimalcoherentdetectiondependsonitsminimumsquaredEuclideandistance(MSED).Inthispaper,areduced-statetrellisforfullresponseCPMispresentedundertheconditionthattheMSEDisnotreduced.andthereforethecomplexityoftheViterbidecodingisroduced.

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简介：Backoffmechanismisakeycomponentofcontention-basedmediumaccesscontrol(MAC)layerprotocol.IthasbeenshownthatthebackoffmechanismofIEEE802.11standardmaybeveryinefficientespeciallywhenthenetworkiscongested.Numbersofmethodshavebeenproposedtotunethecontentionwindow(CW)withtheaimtoachievetheoptimalthroughputinIEEE802.11WLANs.However,themechanismsdonotspecificallyaddresspropersettingsforthevariablepacketlengthinfluenceandCWdivergingproblem.Thispaperproposesanovelfour-wayhandshakingfull-feedbackbackoffalgorithmnamedadoptivecontentionwindowbackoff(ACWB)toovercomethesedrawbacks.Theperformanceoftheproposedalgorithmisinvestigatedthroughanalysisandsimulation.SimulationresultsdemonstratethattheACWBalgorithmprovidesaremarkableperformanceimprovementintermsofshort-termfairness,packetdelayanddelayjitter,whilemaintaininganoptimalthroughputclosetothetheoreticalthroughputlimitoftheIEEE802.11distributedcoordinationfunction(DCF)accessscheme.

简介：Theprinciplesandfeaturesofthepressure-liquidometerusingopticalfibersensor,whichissuitabletouseindangerousareas,aredescribed.Theinstrumentiseapeciallysuitableforautomaticdetectingofpressureandliquidlevelindangerousaslargesacleoiltanker,caveoiltanker,civicliquid-gastankerandsoon.

简介：Thispaperdiscussesthedefinitionandpropertiesofmultivaluedsymmetricfunctions,pointsoutthatamultivaluedsymmetricfunctioncanbedecomposedaccordingtothevalueofthefunctionj.ThesubfunctionLjcorrespondingtojmustbeasymmetricfunction,anditmaybeexpressedasthesumofproductsformofdegeneratedmultivaluedfundamentalsymmetricfunctions.Basedonthisconsideration,thecircuitrealizationforthemultivaluedsymmetricfunctionsbasedonfulladdersisproposed.

简介：MCM(多芯片模块)及3D(三维组装)模块是高密度电子组装的最新技术,尤其是由FlipChip(倒装芯片)构成的MCM及3D模块具有更小的尺寸及更好的电气性能。采用FlipChip裸芯片比其它裸芯片COB(板上芯片)的一个显著优点是FlipChip的引

简介：Anovelsystemconfigurationoffiberopticsensorbasedonopticalabsorptionisproposed.Severalcompensationmeasuresarediscussed.Asimulatedexperimentisdesignedandtheoutputcurveofsystemisgiven.Theexperimentalresultshowsthatthesecompensationmeasuresareeffectiveondynamicdisturbanceswhicharecausedbybackgroundlightandopticalfiberbend,Inaddition,thedriftsinthelightsourceintensity,fiberlosses,andphotodetectorefficiencyareaslocompensated.

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简介：如今，IP网络已经在企事业单位相当普及了，可以实现上网、E-MAIL、会议通知、公告发布、文件共享、办公平台自动化等工作。另外，也有一些企业其部署了电视会议、电话会议、网络监控、安全监控报警、应急调度指挥、可视电话等系统。但是这些不同的系统对于单位信息管理员来说简直就是一场灾难：

简介：Thebandgappropertiesofone-dimensionalphotoniccrystalswithadefectlayerofnegativerefractiveindexmaterialsarestudied.Thedefectmodewidthisbiggerthanthatofconventionalone-dimensionalphotoniccrystalswithadefectlayerofpositiverefractiveindexmaterials.Thedefectmodeoftheformerisdifferentfromthatofthelatter,shiftstowardsthedirectionofhighfrequency(shortwavelength),andhasabiggershiftingvelocity.Furthermoretheeffectsonthetransmissionpropertiesoftheformerphotoniccrystalscausedbychangeinthepositionofthedefectlayerofnegativerefractiveindexareinvestigated.Finallytheopticalenhancementoftheformerphotoniccrystalsisalsoinvestigated.

简介：Panasonic最新推出的AG-3DA1MC．是一款具有1／4CMOS一体化双镜头全高清3D摄录一体机。它拥有汇聚点调整和左右画面自动补偿功能：SDHC半导体卡（X2），文件化的高画质AVCHDPH模式1920×1080记录：高清晰度LCOS彩色寻像器／LCD彩色面板：

简介：Byemployingaradiofrequency(RF)feedbackchain,theself-interferencecanbecanceledefficientlyinco-timeco-frequencyfullduplex(CCFD).However,theevitablesignalcrosstalkwhichiscausedbytheimperfectRFfeedbackchainisolationusuallydamagestheself-interferencecancelation(SIC)performance.Todealwiththisproblem,firstly,weanalyzetheimpactofRFfeedbackchainisolationonSICperformance.ThenadigitalpreprocessingschemewithRFfeedbackchainisproposedinthemultiple-antennaCCFDarchitecture.Usingbothanalyticalandexperimentalmethods,wefindthattheproposedschemeachievesabetterperformanceonSIC.

简介：Afull-duplexopticalpassiveaccessschemeisproposedandverifiedbysimulation,inwhichhybrid64/16/4-quadratureamplitudemodulation(64/16/4QAM)orthogonalfrequencydivisionmultiplexing(OFDM)opticalsignalisfordownstreamtransmissionandnon-return-to-zero(NRZ)opticalsignalisforupstreamtransmission.Inviewofthetransmittingandreceivingprocessfordownlinkopticalsignal,in-phase/quadrature-phase(I/Q)modulationbasedonMach-Zehndermodulator(MZM)andhomodynecoherentdetectiontechnologyareemployed,respectively.Thesimulationresultsshowthatthebiterrorratio(BER)lessthanhardwaredecisionforwarderrorcorrection(HD-FEC)thresholdissuccessfullyobtainedovertransmissionpathwith20-km-longstandardsinglemodefiber(SSMF)forhybriddownlinkmodulationOFDMopticalsignal.Inaddition,bydividingthesystembandwidthintoseveralsubchannelsconsistingofsomecontinuoussubcarriers,itisconvenientforuserstoselectdifferentchannelsdependingonrequirementsofcommunication.

简介：有了星友提供的故障原因，笔者下手自然就不会再通电测试了，而是直接拆机检查。