简介:这篇文章描述在一个无线网孔网络分享系统的一个合作文件的一个新模型。作者的途径是开发基于机会主义的随机的线性网络编码分享机制的一个有效、合作的文件。在这机制以内,每个节点根据合作优先级播送它的包的随机的线性联合,它根据对它的邻居节点的节点可能的贡献以一种分布式的方式被计算。与这机制,一个节点越贡献其它,节点越有机会首先恢复全部文件。这里的兴趣的表演度量标准是:延期被送到直到在一个文件的所有包所有节点,和一种理想的包尺寸,由作者能得到最小的传播延期的使用。没有随机的线性网络编码,通过广泛的模拟,作者在一个无线网孔网络把他们的机制与当前的传播进程作比较。作者发现用他们的机制,节点能合作地与更少的传播时间分享全部文件并且没有随机的线性网络,比当前的传播进程推迟。
简介:Weldshapecontrolisafundamentalissueinautomaticwelding.Inthispaper,adoublesidevisualsystemisestablishedforpulsedgasmetalarcwelding(P-GMAW),andbothtopsideandbacksideweldpoolimagescanbecapturedandstoredcontinuouslyinrealtime.Byanalyzingtheweldshaperegulationwiththemoltenmetalvolume,sometopsideweldpoolcharacterizedparameters(WPCPs)areproposedfordeterminingpenetrationinbuttweldingofthinmildsteel.Moreover,someBPnetworkmodelsareestablishedtopredictbacksideweldpoolwidthwithweldingparametersandWPCPsasinputs.
简介:Rhythmofbrainactivitiesrepresentsoscillationsofpostsynapticpotentialsinneocortex,thereforeitcanserveasanindicatorofthebrainactivitystate.Inordertochecktheconnectivityofbrainrhythm,thispaperdevelopsanewmethodofconstructingfunctionalnetworkbasedonphasesynchronization.Electroencephalogram(EEG)datawerecollectedwhilesubjectslookingatagreencrossintwostates,performinganattentiontaskandrelaxingwitheyes-open.TheEEGfromthesetwostateswasfilteredbythreeband-passfilterstoobtainsignalsoftheta(4-7Hz),alpha(8-13Hz)andbeta(14-30Hz)bands.Meanresultantlengthwasusedtoestimatestrengthofphasesynchronizationinthreebandstoconstructnetworksofbothstates,andmeandegreeKandclustercoefficientCofnetworkswerecalculatedasafunctionofthreshold.Theresultshowshigherclustercoefficientintheattentionstatethanintheeyes-openstateinallthreebands,suggestingthatclustercoefficientreflectsbrainstate.Inaddition,anobviousfronto-parietalnetworkisfoundintheattentionstate,whichisawell-knownattentionnetwork.Theseresultsindicatethatattentionmodulatesthefronto-parietalconnectivityindifferentmodesascomparedwiththeeyes-openstate.Takentogetherthismethodisanobjectiveandimportanttooltostudythepropertiesofneuralnetworksofbrainrhythm.
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简介:在基于竞争的卫星通讯系统,在数据包之间的碰撞可以由于随机包送发生。在每传播前的合适的延期能减少数据碰撞率。作为古典随机的多重存取协议,slotted阿罗哈(S阿罗哈)通过时间槽分配和同步措施减少数据碰撞率。为了改进卫星的稳定性和产量,联网,一个backoff算法将基于S阿罗哈是有效的。一个新适应backoff算法基于用灰系统的S阿罗哈被建议,它根据网络条件适应地计算backoff时间。并且网络条件被每个用户终端在灰系统用模型美国通用汽车公司(1,1)根据隧道存取成功比率的预言估计。建议算法与象二进制指数的backoff(BEB)和多重增加那样的另外的已知的计划相比多重减少(MIMD)backoff。建议算法的表演被模仿并且分析。系统的产量基于BEB和MIMDbackoff基于建议算法比系统好,这被显示出。并且也有与使用BEB相比的延期表演的一些改进。建议算法为在卫星网络的用户终端的大数字是特别有效的。
简介:Mobileplatformdevelopsrapidlyinrecentyears,withitsperformanceandcapacityincreasing.Alargenumberofvirtualrealityapplicationssuchas3Dsimulationandvisualizationhaveappearedonmobileplatform.However,duetorestrictions,suchasthelackofcomputingresourcesandthelimitednetworkbandwidth,thevirtualrealitysystemsonmobileplatformcouldnothavecomparableperformanceastheirpeersondesktopplatform.Takingresourcerestrictionsintoconsideration,trade-offshavebeenmaderegardingthedisplayofvirtualrealitysystems.Weproposeaunifiednetworkschedulingstrategybasedonasynchronousmulti-thread,databasecache,prioritizationandeliminationofoverduerequests.ThisstrategyhasbeentestedontheprototypesystemofvirtualrealitysystemonAndroid.Theresultsdemonstratehighernetworkresourceutilizationandbetteruserexperience.
简介:Knowledgeofthemorphologicaldynamicsofawatercourseisessentialformanagementofreservoirsiltation.WithanexampleofsedimentationinareservoirinBasilicata,Italy,thispaperdemonstratestheeffectonreservoirsiltationofthehydraulicworks,whichareaimedtoreducesedimenttransportalongthefluvialnetworkandtopreventpartofthesedimentdischargefromreachingthelake.Theeffectdependsontherivertypeandonthethegeologicalfeaturesofriverbasinslopes.Thepaperalsoshowshowmasserosioncansignificantlycontributetodevelopmentofreservoirsiltation.Finally,preliminaryresultsareprovidedaboutthetimeneededforrivertrainingworkstobeeffective.