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简介：近年来随着社会信息化日益成熟,各种通信技术不断涌现,互联网已经成为现代社会最重要的信息基础设施之一,成为语音、数据和视频等业务统一承载的网络。人们的生活已经离不开互联网,中国的手机用户已经达到近13亿。为了满足如此庞大的客户需求,运营商通常相隔一定间距建造一座移动电话基站通信塔以满足布点和覆盖面的需求。

简介：本文根据邮政及物流钢结构建筑中电气设计及现场验收时的实际情况进行分析，对钢结构建筑物设计中照明设计、动力配电、防雷接地、消防报警设计等相关问题做出简要的归纳总结。

简介：HandoverinDigitalVideoBroadcastingforHandhelds(DVB-H)aimstoprovidecontinuousmobilebroadcastingserviceswhenauseristravelingthroughcellboundaries.Agoodhandovercontrolcanimprovethepowerefficiencyandgainmuchbetterreceptionquality.ThisletterprovidesanovelapproachforDVB-HhandoverbasedonDVB-H/UniversalMobileTelecommunicationsSystem(UMTS)hybridnetwork,whichmovesthemainhandoverfunctionfromtheterminalstothenetworks,sothatitreducestheoperationcomplexityoftheterminalsandincreasesthepowersaving.WhentheterminalcannotreceivetheDVB-Hsignalinthetransmissionshadowareasorbecauseofsomeotherreasons,theUMTSnetworksmayofferthesameservicetouserstomaketheservicecontinuous.AstheUMTSnetworkshavethetopologyoftheDVB-Hnetworks,bycommunicatingwiththeterminals,theUMTSnetworkscanhelptheterminalstopredictthehandover,andavoidunnecessaryhandover.

简介：Thea-Si∶H/SiNx∶HsampleseriesareinvestigatedbymeansofRamanscatteringtechnique(RST).Theresultshowsthatduetothestructuralmismatchbetweena-Si∶Handa-SiNx∶H,severeinduceddistortionsareproducedintheinterfaceoftheheterojunction,andtheseinduceddistortionstendtowardsacertainenergystate.Theorderingoftheinterfacestructuredependsontheperiodicnumberofmultilayerthinfilms.

简介：本文介绍洁净厂房设计的特点、洁净室的国内外标准制定情况以及洁净室的节能潜力、措施和实例，供读者思考、参考。

简介：Theproblemoftherobustfaultdetectionfilterdesignfortime-varyingdelaysswitchedsystemsisconsideredintheframeworkofmixedH_-/H_∞.Firstly,theweightedH_∞performanceindexisutilizedastherobustnessperformance,andtheH_-indexisusedasthesensitivityperformanceforobtainingtherobustfaultdetectionfilter.ThenanovelmultipleLyapunov-Krasovskiifunctionisproposedforderivingsufficientexistenceconditionsoftherobustfaultdetectionfilterbasedontheaveragedwelltimetechnique.Byintroducingslackmatrixvariable,thecouplingbetweentheLyapunovmatrixandsystemmatrixisremoved,andtheconservatismofresultsisreduced.Basedontherobustfaultdetectionfilter,residualisgeneratedandevaluatedfordetectingfaults.Inaddition,theresultsofthispaperaredependentontimedelays,andrepresentedintheformoflinearmatrixinequalities.Finally,thesimulationexampleverifiestheeffectivenessoftheproposedmethod.

简介：ThispaperintroducestwostepstodesignaquantizerofH.261CODEC:thefirststepistoimplementthecoarsequantizingthroughcontrolalgorithmforthebuffer'soccupationratio;thesecondstepistofinishtheaccuratequantizingthroughthecontrolalgorithmofvisualcharacteristics.Moreover,satisfactoryeffectsaregotusingthesealgorithmsthroughexperiment.

简介：TherobustH∞controlfornetworkedcontrolsystemswithbothstochasticnetwork-induceddelayanddatapacketdropoutisstudied.Whendataaretransmittedovernetwork,thestochasticdatapacketdropoutprocesscanbedescribedbyatwo-stateMarkovchain.Thenetworkedcontrolsystemswithstochasticnetwork-induceddelayanddatapacketdropoutaremodeledasadiscretetimeMarkovjumplinearsystemwithtwooperationmodes.ThesuffcientconditionofrobustH∞controlfornetworkedcontrolsystemsstabilizedbystatefeedbackcontrollerispresentedintermsoflinearmatrixinequality.Thestatefeedbackcontrollercanbeconstructedviathesolutionofasetoflinearmatrixinequalities.Anexampleisgiventoverifytheeffectivenessofthemethodproposed.

简介：Aconductionchannelmodelispropsedtoexplainthehighconductivitypropertyofnc-Si:H.Detailedenergybanddiagramisdevelopedbasedontheanalysisandcalculation,andtheconductivityofthenc-Si:Hwasthenanalysedonthebasisofenergybandtheory.Itisassumedthattheconductivityofthenc-Si:Hstemsfromtwoparts:theconductanceoftheinterface,wherethetransportmechanismisidentifiedasathermal-assistedtunnelingprocess,andtheconductancealongthechannelaroundthegrain,whichmainlydeterminedthehighconductivityofthenc-Si:H.Theconductivityofnc-Si:Hiscalculatedandcomparedwiththeexperimentdata.Thetheoryisinagreementwiththeexperiment.

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简介：本文着重研究了H．265编码的高清视频质量评价方法，以用于未来测试H．265编码器的性能。根据ITUVQEG的最新研究进展，介绍了高清视频的主观评价和客观测量方法，并且分析了目前已有的客观测量技术的主要实现方法和与主观评价方法相关度的结果，最后给出H．265编码视频质量测量技术的发展建议，并指出针对H．265编码器的测试，实验室环境，全参考的方法是首选，而无参考的方法是研究趋势。

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简介：H.26x和MPEG-x都是应用最广泛的视音频压缩国际标准.其中,H.26x是活动图像编码标准,而MPEG则主要包括MPEG视频、MPEG音频和MPEG系统(视音频同步)3个部分的标准.H.26x和MPEG-x既有区别又有紧密的联系,特别是H.262和H.264,它们既是ITU-T制定的标准,又分别是ITU-T与ISO/IEC联合制定的MPEG-2和MPEG-4的组成部分.

简介：Ananalysisisgiventoexplaintheinstabilityofthehighconductivitypropertyofnc-Si:Hfabricated.Detaileddiscussioniscarriedoutconcentratingontheconductivityandgrowthmechanism.Itisassumedthattheinstabilityoftheconductivityofthenc-Si:Hstemsfromtwopart:thephasetransitionfromnanocrystallitesintoa-Si:H,andtheoxygenincorporationofthethinlayerofthefilm,whichcontributesmoretotheeffectwhenthefilmsufferstheexposuretoair.Thetheoryisinagreementwiththeexperimentandmeasurement.

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简介：ThisletterproposesaratecontrolalgorithmforH.264videoencoder,whichisbasedonblockactivityandbufferstate.ExperimentalresultsindicatethatithasanexcellentperformancebyprovidingmuchaccuratebitrateandbettercodingefficiencycomparedwithH.264.ThecomputationalcomplexityofthealgorithmisreducedbyadoptinganovelblockactivitydescriptionmethodusingtheSumofAbsoluteDifference(SAD)of16×16mode,anditsrobustnessisenhancedbyintroducingafeedbackcircuitatframelayer.

简介：IP电话系统作为一种新型电话系统发展非常迅速。H.323协议和SIP协议是IP电话系统重要的信令控制协议,本文主要介绍它们各自的优缺点,并从应用的角度给予分析和比较。

简介：日前，宝利通公司宣布支持突破性的标准化视频压缩技术H．264HighProfile．该技术可节省50％供高清远程呈现和标清视频会议使用的带宽，

简介：H.264/AVC是ITU-TVCEG(视频编码专家组)和ISO/IECMPEG(运动图像专家组)最新的视频标准,与现有的任何标准相比,在同样保真度条件下,节省码率50%以上,适合各种媒体传输和存储,可交互式和非交互式应用,将成为新一代的视频编码标准,应用前景广泛,有限大的经济效益.本文介绍该标准的历史背景、技术要点、应用状况等.