简介：Inthispaperanewsignaturescheme,calledPolicy-EndorsingAttribute-BasedSignature,isdevelopedtocorrespondwiththeexistingCiphertext-PolicyAttribute-BasedEncryption.Thissignatureprovidesapolicy-and-endorsementmechanism.Inthismechanismasingleuser,whoseattributessatisfythepredicate,endorsesthemessage.Thissignatureallowsthesignertoannouncehisendorsementusinganaccesspolicywithouthavingtorevealtheidentityofthesigner.Thesecurityofthissignature,selflessanonymityandexistentialunforgeability,isbasedontheStrongDiffie-HellmanassumptionandtheDecisionLinearassumptioninbilinearmapgroups.

简介：两倍缓冲是有效机制隐藏在在薄片上和离开薄片记忆之间的数据转移的潜伏。在dataflow建筑学，因为dataflow加速器的重复充满并且排干，然而，交换二在许多瓦减少的执行期间缓冲性能。在这个工作，我们为dataflow建筑学建议连续双的缓冲机制。没有停止通过在dataflow建筑学优化控制逻辑处理元素的执行，建议不停的机制把瓦分到处理元素数组。而且，我们建议一个工作流节目与连续双的缓冲机制合作。在控制逻辑上并且在工作流节目上的优化以后，充满并且排干数组需要越过属于一样的dataflow图的所有瓦的执行被做仅仅一次。试验性的结果证明没有优化，为dataflow建筑学的建议双缓冲机制在那上完成16.2%平均效率改进。

简介：Inthispaper,aquantitativeQoSmanagementimplementmechanisminIP-DiffServispresented.Theapproachhasthreemerits:(1)itoptimizesboththerouteselectedforserviceclassbytrafficengineeringinnetworklayerandtheserviceclassselectedfortheuserservicesbynetworkplaninservicelayer,(2)itensuresquantitativeQoSfortheuserserviceinDiffServ,(3)itachieveshighresourceutilization,andachievesbetterperformancewithlesscostfortheuserserviceandselectedroute.Simulationhasverifiedthesemerits.

简介：IEEE802.15.4protocolisproposedtomeetthelowlatencyandenergyconsumptionneedsinlow-ratewirelessapplications,however,fewanalyticalmodelsaretractableenoughforcomprehensiveevaluationoftheprotocol.ToevaluatetheIEEE802.15.4slottedCSMA/CAchannelaccessmechanisminthispaper,weproposeapracticalandaccuratediscreteMarkovchainmodel,whichcandynamicallyrepresentdifferentnetworkloads.Bycomputingthesteady-statedistributionprobabilityoftheMarkovchain,weobtainanevaluationformulaforthroughput,energyconsumption,andaccesslatency.Thenwefurtheranalyzetheparametersthatinfluenceperformanceincludingpacketarrivalrate,initialbackoffexponentandmaximumbackoffnumber.Finally,NS2simulatorhasbeenusedtoevaluatetheperformanceofthe802.15.4CSMA/CAmechanismunderdifferentscenariosandtovalidatetheaccuracyoftheproposedmodel.

简介：Mediumaccesscontrol(MAC)protocolssuchasIEEE802.11areusedinwirelessnetworksforsharingofthewirelessmedium.Therandomnatureoftheprotocoloperationtogetherwiththeinherentdifficultyofmonitoringintheopenposessignificantchallenges.Allnodesareexpectedtocomplywiththeprotocolrules.But,somenodesinordertogaingreaterbenefitsmisbehavebynotcomplyingwiththerules.Onesuchselfishmisbehavioriswaitingforsmallerback-offintervalswhencomparedtotheothernodesinthesamesubnet.Suchselfishmisbehaviorisbeingtackledinthispaper.Adiagnosisschemeandapenaltyschemearebeingproposedforovercomingsuchselfish-misbehavioratMAClayerofmobileadhocnetworkswhichcouldbeextendedtoothertypesofnetworksalso.