简介:TheadvantageofATMtechnologyforstatisticallymultiplexingnetworkresourcesbydifferentusersinvokesthecompetitionofnetworkresources.Thiscompetitionhassomedamagingeffectsonmessagetransmitting.TheresearchfortestingmethodsandtechnologyofATMisimportantforustodevelopATMnetworks,topromotetheirconstruction,toensurethatvariousATMdevicesprovidedbydifferentprovidersinteroperateproperlyandtoprovideexcellentservicesfortelecommunicationusers.Afterdiscussingtheabstracttestingmethodofconformancetestingandtheabstractdescriptionofprotocoltesting,thethesisputsforwardakindofabstracttestingconfigurationforATMtestingandakindofabstractdescriptionmethodfortestingcase.Fromtheangleofapplication,thethesisdiscussesthebasicrulesforATMtesting.Afterthat,thethesispointsoutthattheATMtestingmustbemadefromthefouraspectsofnormaltesting,conformancetesting,performancetestingandinteroperabilitytesting.Thegeneraltestingmethods,generalconfigurationandconnectionforATMtestingandtheselectionofATMtestingitemsarediscussed,respectively,inthefouraspects.CombinedwiththecharacteristicsofthetrafficssupportedbyATMsystems,thethesisdiscussesseveralkindsoftrafficmodelsforconductingATMtesting.Onthebasisofstudyingvarioustrafficmodels,theauthorclassifiestrafficmodelsforATMtestingasthreekinds:periodictrafficmodels,stochastictrafficmodelsandmanualtrafficmodels.Theparametersofdescribingtrafficmodelsandtheircalculatingmethodarediscussedinthethesis.Anewkindofperiodiccell-sequencetrafficmodelisproposedinthisthesis.Theperiodiccell-sequencetrafficmodelhasexcellentlinearlydescendingcharacteristicsinthecellinterval.ThetrafficmodelsdiscussedinthisthesiscanbeappliedtovariousATMtestingcases.Fromthepointofnormaltesting,physicallayertesting,ATMlayertesting,AALlayertesting,networkmanagementtesting
简介:这篇文章检验危险驱动在软件和密码的算法的硬件实现之间的分析攻击。包括一个Atmel89S82528位处理器和0.25m的代表性的平台1.8v标准房间电路被建议实现进展加密标准(AES)。基于模拟的试验性的环境被造获得力量数据,和单个小点的微分力量分析(DPA),并且多小点DPA和关联驱动分析(CPA)攻击分别地在二实现上被进行。试验性的结果证明硬件实现让更少的数据依赖者驱动漏抵抗力量攻击。而且,一条改进DPA途径被建议。它作为力量模型采用中间的结果的hamming距离并且安排纯文本输入区分力量踪迹到最大的概率。与原来的力量攻击相比,我们的改进DPA与可接受的力量大小和更少计算在AES硬件实现上执行成功的攻击。
简介:Customers'satisfactionwithservicesisreflectedbyqualityofexperience(QoE).Insofar,moststudiesoncooperativecommunicationhavebeenfocusedonimprovingtheQoEofsourceusers.However,theimprovementofasourceuser'sQoEisobtainedatcostofdegradationoftherelayuser'sQoE.Ontheotherhand,cooperativecommunicationscanachieveperformancesimilartothatofaconventionalmultiple-inputmultiple-output(MIMO)systembyformingvirtualMIMOarrays.Hence,toimprovetheQoEperformanceofrelayusers,thisarticleproposestheconceptofabeliefthresholdatthedestinationuserandanewcooperativeschemebasedonthebeliefthresholddestination(BTD)technique,whilewithoutdecayingtheBERperformanceofthecommunicationsystem.
简介:Thekeyideabehindculturalalgorithmistoexplicitlyacquireproblem-solvingknowledgefromtheevolvingpopulationandinreturnapplythatknowledgetoguidethesearch.Inthisarticle,culturalalgorithm-simulatedannealingisproposedtosolvetheroutingproblemofmobileagent.Theoptimalindividualisacceptedtoimprovethebeliefspace’sevolutionofculturalalgorithmsbysimulatedannealing.Thestepsizeinsearchisusedassituationalknowledgetoguidethesearchofoptimalsolutioninthepopulationspace.Becauseofthisfeature,thesearchtimeisreduced.Experimentalresultsshowthatthealgorithmproposedinthisarticlecanensurethequalityofoptimalsolutions,andalsohasbetterconvergencespeed.Theoperationefficiencyofthesystemisconsiderablyimproved.
简介:InvehicleAd-hocnetwok(VANET),trafficloadisoftenunevenlydistributedamongaccesspoints(APs).Suchloadimbalancehampersthenetworkfromfullyutilizingthenetworkcapacity.Toalleviatesuchimbalance,thepaperintroducesanovelpricinggamemodel.Theresearchsceneisattheintersectionwhenthetrafficlightisgreen.Asvehiclesarehighlymobileandthenetworktypologychangesdynamically,thepaperdividesthegreenlighttimeintoequalslotsandcalculatesAPs'priceswiththepresentedpricinggameineachtimeslot.Thewholeprocessisarepeatedgamemodel.ThefinalequilibriumsolutionsetisAPs'pricingstrategy,andthepaperclaimthatthisequilibriumsolutionsetcanaffectvehicles'selectionandensureAPs'load-balancing.Simulationresultsbasedonarealisticvehiculartrafficmodeldemonstratetheeffectivenessofthegamemethod.
简介:Cooperativediversityisanewtechnologytoimprovebiterrorrate(BER)performanceinwirelesscommunications.AnewpowerallocationalgorithmtoimproveBERperformanceincellularuplinkhasbeenproposedinthispaper.Someexistingpowerallocationschemeswereproposedforthepurposeofmaximizingthechannelcapacityorminimizingtheoutageprobability.Differentfromtheseschemes,theproposedalgorithmaimsatminimizingtheBERofthesystemsundertheconstraintoftotaltransmissionpower.Besidesthischaracteristic,theproposedalgorithmcanrealizealowcomplexityreal-timepowerallocationaccordingtothefluctuationofchannels.SimulationresultsshowthattheproposedalgorithmcandecreasetheBERperformanceofthesystemseffectively.
简介:ToimproveuserexperienceofcompositeWebservices,auser-awarequalityofservice(QoS)basedWebservicescompositionmodelisproposed.Undersuchmodel,aWebservicesselectionmethodbasedonquantumgeneticalgorithmisproposed.Thisalgorithmusesquantumbitencoding,dynamicstep-lengthquantumgateangleadjustment,neighborhoodservicesearchanddynamicpunishmentstrategytoexpandsearchscopeandspeedupconvergence.SimulationexperimentshowsthatthisalgorithmismoreefficientthanotherexistingalgorithmsinWebservicesselection.
简介:WiMAX得到了业界的广泛支持,其标准化进程不断推进。本文给出了WiMAX标准化组织IEEE802.16工作组和WiMAX论坛的组织机构,分析了两大组织之间的相互关系,探讨了WiMAX最新标准化进展,从空中接口标准、一致性标准和共存标准三方面介绍了IEEE802.16系列标准现状。