简介:Traditionally,thedecisiontreemethodisdefinedandusedforfindingtheoptimalsolutionofaBayesiandecisionproblem.Anditisdifficulttousethedecisiontreemethodtofindthesub-optimalsolution,nottomentiontorankalternatives.Thispaperdiscusseshowtousethedecisiontreemethodforthealternativeselectingandranking.Apracticalcasestudyisgiventoillustratetheapplicability.
简介:Thispaperpresentsanewmethodforresynchronizationattack,whichisthecombinationofthedifferentialcryptanalysisandalgebraicattack.Byusingthenewmethodonegetsasystemoflinearequationsorlow-degreeequationsaboutinitialkeys,andthesolutionofthesystemofequationsresultsintherecoveryoftheinitialkeys.Thismethodhasalowercomputationalcomplexityandbetterperformanceofattackincontrasttotheknownmethods.Accordingly,thedesignoftheresynchronizationstreamgeneratorsshouldbereconsideredtomakethemstrongenoughtoavoidourattacks.WhenimplementedtotheToyocrypt,ourmethodgainsthecomputationalcomplexityofO(217),andthatofO(267)forLILI-128.
简介:The’polarcoding’proposedbyDr.Arkancanachievethesymmetriccapacityofbinary-inputdiscretememorylesschannels(B-DMC).ThegeneratormatrixofpolarcodesisGN=BNFnforN=2n,BNwasapermutationmatrix.Inthearticleitwasrealizedwithaninterleaver,sothematrixproductionofGNwasavoided;thenthegeneratormatrixwasjustdeterminedbythematrixFnwhichwasconstructedwiththreesub-matrixesofFn-1andone2N-1orderzeromatrix,itwasdealwithfastHadamardtransform(FHT)algorithm.Thecomplexityofthenewschemewasreducedsharply,andaniterativealgorithmalsocanbeused.TheexampleshowedthatwhenN=8,complexityoftheencodingschemewasjust16whichisobviouslylessthanthatoforiginalencodingscheme36.
简介:Theweightedreliabilityofnetworkisdefinedasthesumofthemultiplicationoftheprobabilityofeachnetworkstatebyitsnormalizedweightingfactor.Underacertainstate,whenthecapacityformsourcestosinktislargerthanthegivenrequiredcapacityCr,thenthenormalizedweightingfactoris1,otherwise,itistheratioofthecapacitytotherequiredcapacityCr.Thispaperproposesanewalgorithmfortheweightedreliabilityofnet-works,putsforwardtheconceptofsaturatedstateofcapacity,andsuggestsarecursiveformulaforexpandingtheminimalpathstobethesumofqualifyingsubsets.Inthenewalgorithm,theexpansionsoftheminimalpathsdon'tcreatetheirrelevantqualifyingsubsets,thusdecreasingtheunnecessaryexpandingcalculation.Comparedwiththecurrentalgorithms,thisalgorithmhastheadvantageofasmallamountofcomputationsforcomputerimplementa-tion.
简介:DiscreteFourierTransform(DFT)basedmultiple-inputmultiple-outputOrthogonalFrequencyDivisionMultiplexing(MIMO-OFDM)isthefocusofwirelesscommunication,whichusescyclicprefixestoreducetheISI.Toimprovethespectrumefficiencyandsystemperformance,ComplexWaveletPacketTransform(CWPT)basedOFDMisusedtorealizetheMIMO-OFDMsystem.Forthegoodpropertyofcomplexwaveletpacketfunction,theCWPTbasedMIMO-OFDMsystemisbetterthantheDFTbasedMIMO-OFDMsystem,buttheCWPTbasedMIMO-OFDMschemehassomeadditionalcomplexity,andsimulationresultsshowthatthenewsystemcanimprovethesystemperformance.
简介:Anewiterativemethodforsignal,restorationhasbeenpresented.AnestimateoperatorW_κwhichisrelatedtoerroroperatorB_κintherestorationprocessisintroducedtodecreasetheestimateerrorandincreasetheconvergencerate.Theeffectofnoiseontheestimateprocesshasalsobeendescribed.Finally,themethodhasbeenappliedtothedeconvolutionofablurredsignal,andtheresultsvalidatethemethod.Acomparisonbetweenthepresentedmethodandthegeneralmethodhasalsobeengiven.
简介:AnewsingularityextractiontechniqueispresentedtocalculateaccuratelythesingularintegralsinTimeDomainElectricFieldIntegralEquation(TDEFIE).Insingularityextractionpro-cedure,throughtheaidofthefirstorderTaylorseriesoftimebasefunctionincludingtime-retardation,thesingularityoftheintegrandcanberemoved.Thesurfacecurrentdensityandbackscatteredfar-fieldresponseofaconductingcubeilluminatedbyaGaussianplanewaveiscom-putedusingthepresentedtechnique.ComparisonsaremadewiththeresultsobtainedbytheInverseDiscreteFourierTransform(IDFT)ofthefrequencydomainandtheresultsobtainedbyusingVe-chinski'stimeaveragingtechnique,whichdemonstratethatthepresentedmethodwiththisnewtimedomainsingularityextractiontechniquetosolveTDEFIEisveryaccurateandstable.
简介:AnewFFTalgorithmhasbeendeduced,whichiscalledthebase-6FFTalgorithm.TheamountforcalculatingtheDFTofcomplexsequenceofN=2rbythebase-6FFTalgorithmisMr(N)=14/3*Nlog6N-4N+4formultiplicationoperationofrealnumberandAr(N)=23/3*Nlog6N-2N+2foradditionoperationofrealnumber.TheamountforcalculatingtheDFTofrealsequenceisahalfofitwiththecomplexsequence.
简介:Anewall-opticaldemultiplexerbasedonnonlineareffectinsemiconductorlaseramplifier(SLA)isproposed.ItcandemultiplexallchannelsoftheOTDMsignalconcurrently.anditcanalsobeintegratedonasinglechip.TheproposeddeviceconsistsofaseriesshortFabry-Perotamplifiers(FPSLA)settingonthepathverticsally,throughwhichthepreamplifiedopticalsignaltravels.Perpendicularlytothesignal,K(channelnumber)paralleledbeamsoflightpulse,whichactasprobeswithrepetitionatthebitrateofonechannel,irradiateontheseFP-SLAs,respectively,justwhenthecorrespondingsignalchannelpulsepassesthroughtheactiveregionfromlateralside.Thetransmissivitydependsonthesignalpulse.Theoreticalanalysishasbeengiven.Asademonstratingexample,Adeviceoperatedatthespeedof25Gbit/s(2.5Gbit/s×10)issimulatedandtheresultsshowthattheabout9.24dBextinctionratiocanbeachievedeasily.
简介:Anewopticalfiberfluoropticthermometerbasedonthetemperature-fluoropticcharacteristicoffluoropticmaterialsispresented.Theratiotechniqueofintensitiesoffluorescentemissionlinesofcertainrareearthphosphorsisused,makingthemeasurementoftemperaturesofthesystemto0.5℃precision.Thecharacteristicsofthermometerarediscussedandtheexperimentresultsoftemperaturearegiven.
简介:Twotypesofnewsubliminalchannelsareconstructedrespectivelybasedonprovablesecurepublickeycryptosystemsandidentityrecognitioninsomenetworkapplications.Researchshowsthattherearesomenewcharacteristicswhichareinfavorofcovertcommunicationinourconstructions.Itishardtomakethesubliminalchannelsfree,andthechannelshavelargecapacityandhightransmissionefficiency.Wealsopointoutthatthehardnesstomakethechannelsfreeisdisadvantageoustothewardenwhotriestothwartthecovertcommunication.
简介:Thedatausedintheprocessofknowledgediscoveryoftenincludesnoiseandincompleteinformation.Theboundariesofdifferentclassesofthesedataareblurandunobvious.Whenthesedataareclusteredorclassified,weoftengetthecoveringsinsteadofthepartitions,anditusuallymakesourinformationsysteminsecure.Inthispaper,optimalpartitioningofincompletedataisresearched.Firstly,therelationshipofsetcoverandsetpartitionisdiscussed,andthedistancebetweensetcoverandsetpartitionisdefined.Secondly,theoptimalpartitioningofgivencoverisresearchedbythecombingandpartingmethod,acquiringtheoptimalpartitionfromthreedifferentpartitionssetfamilyisdiscussed.Finally,thecorrespondingoptimalalgorithmisgiven.Therealwirelesssignalsofftencontainalotofnoise,andtherearemanyerrorsinboundarieswhenthesedataisclusteredbasedonthetradionalmethod.Inourexperimant,theproposedmethodimprovescorrectrategreatly,andtheexperimentalresultsdemonstratethemethod’svalidity.
简介:Inbandpasssigmadeltamodulator,resonatoristhekeyblock.Thispaperproposedanewresonatorwhichcansimplifythecircuitimplementationwhendesigningbandpassmodulatorwithlowpassprototype.Theeffectoffinitegain,finitebandwidth,andpathmismatchontheresonatorisanalyzed.ThefunctionoftheproposedresonatorandthedeviredequationsaboutpathmismatchhavebeenverifiedbyswitchedcapacitorsoftwareSWITCAP.
简介:Inordertoformanemergencycontrolpolicytablequickly,thispaperproposesafastalgorithmofemergencycontrolnamed'micro-stepdiscretemethod',whichisbasedonthephysicalmeaningofthegradientandthediscretecharacteristicsofemergencycontrol.Thenitisimprovedthroughthestabilitycriterion,integralstep,andmicro-stepfactor.Thispapertakesgenerator-sheddingastheemergencycontrolmeasures.Astheoptimalgenerator-sheddingcontrolisessentiallyanoptimalcontrolproblemandthegenerator-sheddingvariablesarealwaysconstant,itisconvenienttousethecontrolparameteralgorithmtosolvetheproblem,whichcancalculatethegradientofthetransientstabilityfunctiontocontrolvariables.