简介:Organicconductorisakindoforganiccompoundwhichhasspecialelectronicandmagneticproperties.Theresearchoftheorganiccompoundshasreceivedconsiderableattentionbecauseoftheirpotentialapplicationsinmanyareas.Themolecularconductiveunitsaretheoreticallyinvestigatedaswellastheirenergygapandchargedistribution.Therelationshipofconductivityandmicro-mechanismisdiscussed.
简介:ThewholechemicaletchingprocessonaP-typepolycrystallinesiliconsubstratewithresistivity1-2Ω·cmisdescribed.Theformationmechanismofporouspolycrystallinesilicon(PPS)microstructurewasinvestigated.ThosehowtheinitialpitswereformedandanuniformmorphologyofPPSwasobtainedareexplained.Twotypesofetchingmechanismwerecharacterizedasdefectcontrolreactionanddiffusioncontrolreaction.ThemorphologyformedaftertheisotropicacidicsolutionetchingwithdifferentetchingtimeandHF/HNO3concentrationwascomparedwiththeeffectofthesameetchingprocessafteranisotropicalkalineetching.Thestudyshowedthatthethicknessofporouspolycrystallinesiliconlayerwithchemicalacidicetchingentirelydependedontheexistenceofvarioustypesofdefects.
简介:SurvivabilityisoneoftheimportantissuesinATM-basednetworkssineevenasinglenetworkelementfailuremaycauseaseriousdataloss.Thispaperintroducesanewrestorationmechanismbasedonmulti-layerATMsurvivablenetworkmanagementarchitecture.ThismechanismintegratesthegeneralcontrolandrestorationcontrolbyestablishingtheWorkingVPslogicalnetwork,BackupVPslogicalnetworkandsparelogicalnetworkinordertooptimallyutilizethenetworkresourceswhilemaintainingtherestorationrequirements.
简介:Theγ-rayradiationwillspeedupthedischargeofthestoredchargeinnonvolatileMNOSstructure.Theradiationabsorptionmechanismtoenhancethedischargeisdiscussed.Adirectradiationemissionmodelfromtheinterfacetrapsdistributingbothinenergylevelandinspaceisgiven.Thetheoreticalresultsbasedonthismodelareingoodagreementwithexperimentalmeasurement.
简介:ThispaperproposesanovelsessionsetupmechanisminIMS(IPMultimediaSubsystem)byintroducingthefunctionalentitytermedVSS(VisitorSubscriberServer)whichisusedtoprovideregistrationandlocationmanagement.ThenewmechanismaimsatimprovingsessionsetupprocedurebyabettermentoflocationmanagementinIMS.Throughtheuseoftwo-tiersubscriberinformationdatabaseconstitutedbytheHSS(HomeSubscriberServer)andtheVSS,thenewmechanismseperatestheregistrationprocedureandlocationmanagementfromtheS-CSCF(Serving-Call'SessionControlFunction),andmakesthembehandledbytheVSS.Atthesametime,thenewmechanismupdatesthesignalingprocedureofregistrationandsessionsetup.WithVSSbasedlocationmanagement,thecostofregisterationandsessionsetupprocedureaswellasthedelayofsessionsetupprocedurebecomelower.Thecostanddelayfunctionsofthenewsessionsetupmechanismaswellasthecostfunctionofnewregisterationarededuced.Then,simulationsandanalysisverifythattheperformanceofthisnewmechanismgetsthebenefitincostandtime.
简介:通信展专题安全的网络更重要2000年国际通信展向前去参观的数以万计的中国观众描绘了现在及未来的美好通信世界。在这个五彩缤纷、变幻无穷的信息时代,DinoRomano先生意味深长地告诉我们:维持这个繁荣世界的关键是网络的安全问题。简单的说,安全的网络对运营商来说意味着更高的业务收入和更低的运营成本。DinoRomano先生是阿尔卡特传输业务总经理兼阿尔卡特成都通信系统有限公司总经理,他介绍说:阿尔卡特将时刻按照运营商和用户的需求提供安全的网络服务作为自己工作的出发点。在现今竞争日益激烈的市场上,新的而且往往是本地的运营商不断加入到传统运营商的的行列,过去,传统运营商向设备制造商更多提出的是自己的技术要求,但是在今天新兴的运营商却趋向于越来越多地委托他人代管从设计到网络运营以至相关财务运作等项目,以便更好地执行面向最终用户的市场战略,正是由于这种新形势的需要,阿尔卡特愿意成为新时代的网络设计师。DinoRomano先生极其形象地向我们描述到,整个网络就好像一座城市,接入点相当于城中的大楼,城市中的大街相当于网络中的链路,街道的宽度就是带宽,十字路口相当于路由点,网络管理系统相当于红绿灯,网管人员可视为...
简介:Aprincipalchallengeinsupportingreal-timevideoservicesoverATMistheneedtoprovidesynchronousplay-outinthefaceofstochasticend-to-endnetworkdelays.Inthispaper,anintelligenttrafficsmoothmechanism(ITAM)isproposedtomeetthecontinuityrequirementwhichiscomposedofaback-propagationneuralnetwork(BPNN)trafficpredictoraplay-outbuffer,andafuzzyneuralnetwork(FNN)basedplay-outratedeterminator.TheBPNNtrafficpredictoronlinepredictsthemeanpacketrateofthetrafficinthefutureinterval(FI)andtheFNNisdesignedtoadaptivelydeterminatetheplay-outtimeaccordingtothenumberofpacketsinthebufferandthetrafficcharacterpredicted.Simulationresultsshothatcomparedtothewindowmechanism,ITSMachieveshighcontinuitywithaccepteddelay.Furthermore,ITSMcanbeadaptivelymodifiedtomeettheQoSofdifferentkindsofservicesbyFNNparametertraining.
简介:AlosslessimagesecretsharingusingasimpleBooleanoperationisproposed.Theconceptofvisualcryptographyinthesecretsharingschemeisusedtoredesignalosslesssecretsharingscheme.Toensurethatthereconstructedimageisthetruesecretimage,anauthenticationmechanismisimportedintotheproposedschemetoverifywhethertheshadowsareauthenticbeforereconstructingthesecretimage.TheproposedschemedeliversmuchmoreeffectiveperformancethanChenandWu'sscheme.
简介:Wehaveanalyzedtheorder-disorderingvarianceduetoresonanceeffectandthenonlinearbehavioroffarinfraredraylaser(FIRL)-biologicalsysteminteraction.TheanalyticresultsshowthattheinteractionbetweenthelivingbiologicalsystemandFIRLcanproduceresonanceexcitationeffect,andsotheoriginalhighorderedstateofthesystemcanbedestroyedandthustheconformationvariationinthesystemcanbeproducedunderfurtheractionofthelaser.Inaddition,wehaveanalyzedthenonlinearpropertiesoftheFIRLbio-moleculeinteractionandexplainedthemutagenesiseffectsofFIRL.ThetheoreticanalysisisconsistentwiththeresultsofFIRLmutagenesisbreedingtest.
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。