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5 个结果
  • 简介:BackgroundInmanyEuropeanandAmericanhospitals,representedbytheHouseEarClinic(HEC),theoverlaytympanoplastyisusedwithrareexception,withsimultaneouscanalwallupordownmastoidectomybeingtakenifneeded.InChina,underlaytympanoplastyisusedacrossthecountry,buttheoverlaytech-niqueisusedrarely.Theaimofthecurrentstudywastoreporttheauthors’experiencewithoverlaytympa-noplastyin83Chinesepatientsandstudyitsvalue.MethodsEight-threepatients(86ears)underwentover-laytympanoplastyinaccordancetothestandardoftheHEC.Thepatientswerefollowedupandconditionsoftheexternalauditorycanal,tympanicmembraneandhearingwerereviewedandanalyzed.ResultsAllpatientsgainedstageIincisionhealing.Thesizeofexternalauditorycanalandtympanicmembranemor-phologyweresatisfactory.Hearingeitherremainedunchangedorimproved.Therewerenohearingdeterio-rationorseriouscomplications.ConclusionsOverlaytympanoplastycarriespositivevalueintreatingchron-icotitismediaandcholesteatomawiththemeritsofprocedurestandardization,adequateoperativeexposure,thoroughdiseaseeliminationandextensiveadaptation.

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  • 简介:在大规模上在因特网上由于部署因特网协议(IP)的困难多点传送,覆盖多点传送被看作了一种有希望的选择在最近的年里开发multicast通讯。然而,存在覆盖多点传送解决方案受不了高费用在提交树的multicast维持节点的州的信息。一个无状态的覆盖多点传送计划被建议,在哪个multicast路由信息被一个花蕾过滤器(BF)编码并且没有对维持提交树的multicast的任何需要,包含了进包头。我们的计划利用节点异质,在物理拓扑学并且层次地的最近信息由把几何坐标分到所有覆盖节点构造运输树桩覆盖拓扑学。更重要地,计划使用BF技术识别提交树的multicast的节点和连接,它改进提交的效率并且减少假积极的提交环。分析并且模拟结果证明这个建议能完成高提交效率和好可伸缩性。

  • 标签: 覆盖多点传送 BF 因特网节点坐标 网络了解
  • 简介:摘要:全球通信对“一个全球网络”提出了强烈的要求。然而,公共互联网由于其固有机制在实现这一目标方面面临着巨大的挑战。在本文中,我们提出了互联网第二平面,这是一个构建在全球公有云之上的通用高质量网络,以加速全球通信。我们通过三个关键技术实现了第二平面。首先,我们开发了一种自动拓扑规划技术,以选择最佳候选云节点。其次,我们设计了一种新的时变路由技术来计算云网络的最佳路由。第三,我们实现了一个新的动态传输层,通过云网络提供高质量的数据传输。通过原型评估公有云平台上的云网络,结果表明,云网络的性能大大优于现有的底层网络,RTT 时延降低 15.2%,丢包率降低 1.9%,吞吐量提高10倍。

  • 标签: 云网络 overlay
  • 简介:AnoverlaycoatingmaterialwasdepositedonasinglecrystalsuperalloySRR99bylasercladding.Themicrostructureandoxidationbehaviorofthiscoatingwasinvestigatedthroughscanningelectronmicroscopy(SEM)andX-raydiffraction(XRD).Theresultsindicatedthatalthoughthecompositionofthecoatingwaschosenbasedontheγ'compositioninReneN5superalloy,theprimarysolidificationphaseofthiscoatingduringlasercladdingwasγ-Ni.Furthermore,underthelasercladdingcondition,fineparalleldendritesgrewepitaxiallyinthecoatingfromthesubstrate,indicatingthesinglecrystalstructureofthesubstratewasreproduced.WhenthesinglecrystalMCrAlYcoatingwasoxidizedat1000,bothB-AI2O3and(Y-Al2O3formedduringinitialoxidationprocess.Astheoxidationtimeproceeded,thepreseneeof0-Al2O3facilitatedtheformationofNiAl2O4spineloxide.Oncethespinelwasobserved,itflourishedandinducedsomeporosityinthescale.Whenthescalethicknessincreasedto6-7μm,largeareaspallationofthescalebegan.

  • 标签: Laser CLADDING Single crystal growth EPITAXY