简介:Treetopologies,whichconstructspatialgraphswithlargecharacteristicpathlengthsandsmallclusteringcoefficients,areubiquitousindeploymentsofwirelesssensornetworks.Smallworldsareinvestigatedintree-basednetworks.Duetolinkadditions,characteristicpathlengthsreducerapidlyandclusteringcoefficientsincreasegreatly.Atreeabstract,Cayleytree,isconsideredforthestudyofthenavigationalgorithm,whichrunsautomaticallyinthesmallworldsoftree-basednetworks.Inthefurtherstudy,epidemicsinthesmallworldsoftree-basedwirelesssen-sornetworksonthelargescalearestudied,andthepercolationthresholdiscalculated,atwhichtheoutbreakoftheepidemictakesplace.ComparedwithCayleytree,thereisasmallerpercolationthresholdsufferingfromtheepidemic.
简介:Thewirelessapplicationprotocol(WAP)protocolisnowtheleadingstandardforinformationservicesonwirelessterminalslikedigitalmobilephones.BytheuseofWAP,wirelessdevices,likemobilephones,arepossiblyinfectedwithvirusandworms.Thoughuptonowthereisnosuchattack,astheusageofscriptlanguagesincreases,thereisachanceofmaliciouscodeinjection.ThispaperdiscussesthethreatswithcurrentWAPprotocol,andhowchangesintheprotocolandtheincreaseinitsusagewillenableentryofrealviruses.Futurethreatscenariosarepresentedalongwithsuggestionstoavoidtheseproblems.
简介:Toavoidunevenenergyconsuminginwirelesssensornetworks,aclusteringroutingmodelisproposedbasedonaBayesiangame.Inthemodel,Harsanyitransformationisintroducedtoconvertastaticgameofincompleteinformationtothestaticgameofcompletebutimperfectinformation.Inaddition,theexistenceofBayesiannashequilibriumisproved.Aclusteringroutingalgorithmisalsodesignedaccordingtotheproposedmodel,bothclusterheaddistributionandresidualenergyareconsideredinthedesignofthealgorithm.Simulationresultsshowthatthealgorithmcanbalancenetworkload,saveenergyandprolongnetworklifetimeeffectively.
简介:Weproposetheuseofapowerpulseshapeofthewidelyknownopticalsoliton,correspondingtothehyperbolicsecantsquarefunction,forbothconventionalatmosphericopticalcommunicationsystemsand,especially,fornewfull-opticalwirelesscommunications.Weanalyzetheperformanceoftheproposedpulseintermsofpeak-to-averageopticalpowerratio(PAOPR)andbiterrorrate(BER).Duringtheanalysis,wecomparetheproposedpulseshapeagainstconventionalrectangularandGaussianpulseshapeswithreduceddutycycle.Resultsshowthenoticeablesuperiorityoftheproposedpulseforatmosphericopticallinks.
简介:Powerefficiencyandlinkreliabilityareofgreatimportanceinhierarchicalwirelesssensornetworks(HWSNs),especiallyatthekeylevel,whichconsistsofsensornodeslocatedonlyonehopawayfromthesinknodecalledOHS.ThepowerandadmissioncontrolprobleminHWSNsiscomsideredtoimproveitspowerefficiencyandlinkreliability.Thisproblemismodeledasanon-cooperativegameinwhichtheactiveOHSsareconsideredasplayers.Byapplyingadouble-pricingschemeinthedefinitionofOHSs'utilityfunction,aNashEquilibriumsolutionwithnetworkpropertiesisderived.Besides,adistributedalgorithmisalsoproposedtoshowthedynamicprocessestoachieveNashEquilibrium.Finally,thesimulationresultsdemonstratetheeffectivenessoftheproposedalgorithm.
简介:没有硬连线的连接,高精力的灯激活的opto机电的致动器的一种photostrictive类型能介绍使活动和控制效果。这份报纸经由photostrictive致动器在板结构的无线颤动控制探讨可控制性方面。一个形式的力量索引,考虑了致动器的模式数字,空间分发,和尺寸,被选择为客观功能决定photostrictive致动器的最佳的地点。线性方法论在这篇论文被建议,颤动方程在标准州空间的形式被写。基于的编码二进制代码的GA联合了最佳的放置和LQR(线性二次的管理者)控制计划被合并了,它最大化形式的力量索引,抑制的关上的环并且最小化输入光紧张到致动器。在现在的方法,三个仅仅weighting因素被用来用GA寻找最佳的Q和R矩阵,它减少染色体长度并且因此最小化计算时间。数字结果证明战略上放的致动器补丁的使用能有效地控制统治结构的颤动的基本模式。
简介:有连接纤维的分布式的天线(CWLAN食物及药品管理局)的认知无线本地区域网络是在纤维,认知收音机和提供高速度/高度能力的分布式的天线技术上联合无线电的有希望、有效的体系结构以合理成本的无线存取。在这份报纸,一条学习Q途径被使用在CWLAN食物及药品管理局实现动态隧道赋值(DCA)。认知存取点(帽子)选择并且分配最好的隧道在之中工业、科学、医药(主义)为数据包传播的乐队,给目的是最小化外部干扰并且获得更好网络宽的性能。当能在正常操作期间探索一个CWLAN食物及药品管理局系统的状态时,学习Q方法避免解决复杂优化问题。模拟结果表明建议策略在减少停止概率和改善网络产量是有效的。