简介：

简介：Alocalizedparametrictime-shearedGaboratomisderivedbyconvolvingalinearfrequencymodulatedfactor,modulatinginfrequencyandtranslatingintimetoadilatedGaussianfunction,whichisthegeneralizationofGaboratomandismoredelicateformatchingmostofthesignalsencounteredinpractice,especiallyforthosehavingfrequencydispersioncharacteristics.Thetime-frequencydistributionofthisatomconcentratesinitstimecenterandfrequencycenteralongenergycurve,withthecurvebeingobliquetoacertainextentalongthetimeaxis.Anovelparametricadaptivetime-frequencydistributionbasedonasetofthederivedatomsisthenproposedusingaadaptivesignalsubspacedecompositionmethodinfrequencydomain,whichisnon-negativetime-frequencyenergydistributionandfreeofcross-terminterferenceformulticomponentsignals.Theresultsofnumericalsimulationmanifesttheeffectivenessoftheapproachintime-frequencyrepresentationandsignalde-noisingprocessing.

简介：在这份报纸，一个频率领域决定反馈均衡器为单身的搬运人传播被建议，时间颠倒时空块(TR-STBC)编码。斜决定反馈均衡器矩阵能从频率领域隧道反应是计算的，这被显示出。在完美的反馈假设下面，建议均衡器能接近匹配的过滤器界限(MFB)。与存在时间领域决定反馈均衡器相比，建议均衡器与一样的均等复杂性展出更好的性能。

简介：一种技术把重叠频率时间分割称为multiplexing(OVFTDM))在这篇文章被建议。这种技术从Nyquist系统和频率时间部门multiplexing系统被导出。没有orthogonality，信号是什么时候，简洁地及时重叠了领域，，当没有orthogonality，信号简洁地在频率领域被重叠时，这种技术被称为重叠时间部门multiplexing(OVTDM)，这种技术被称为重叠频率部门multiplexing(OVFDM)。进一步改善光谱效率，在哪个发信号的OVFTDM在频率领域两个都被重叠，及时，域被探索。OVFTDM不取决于无论什么的orthogonality及时域或在象Nyquist系统或OFDM系统一样的频率领域，但是在在信号之中的convolutional限制关系上。因此，不是仅仅光谱效率而且可靠性被改进。模拟验证这个理论的有效性。

简介：Thispaperpresentsanoveltimedelayestimation(TDE)methodusingtheconceptofentropy.Therelativedelayisestimatedbyminimizingtheestimatedjointentropyofmultiplesensoroutputsignals.Whenestimatingtheentropy,theinformationaboutthepriordistributionofthesourcesignalisnotrequired.Instead,theParzenwindowestimatorisemployedtoestimatethedensityfunctionofthesourcesignalfrommultiplesensoroutputsignals.Meanwhile,basedontheParzenwindowestimator,theRenyi’squadraticentropy(RQE)isincorporatedtoeffectivelyandefficientlyestimatethehigh-dimensionaljointentropyofthemultichanneloutputs.Furthermore,amodifiedformofthejointentropyforembeddinginformationaboutreverberation(multipathreflections)forspeechsignalsisintroducedtoenhancetheestimator’srobustnessagainstreverberation.

简介：Operationalsoftwaresystemsoftenexperiencean'aging'phenomenon,characterizedbyprogressiveperformancedegradationandasuddenhang/crashfailure.Softwarerejuvenationisaproactivefault-tolerancestrategyaimedtopreventunexpectedoutagesduetoaging.Anewrejuvenationstrategybasedonmeasurementandtime,andconstructsaSRNmodeltoevaluatethisstrategy.Numericalresultsshowthatthisstrategyoutweighseitherthepurelymeasurementbasedorthepurelytime-basedstrategyandcaneffectivelyimprovesystemperformance.

简介：Theequationoftime-domainwavepropagationindispersivemediaandtheexplicitbeampropagationmethodarepresentedinthispaper.Thismethodisdemonstratedbytheshortopticalpulsesinadirectionalcouplerwithsecondorderdispersiveeffectandshowstobeinfullagreementwithformerreferences.Thismethodissimple,easyandpractical.

简介：Theterahertztime-domainspectroscopy(THz-TDS)systemandtherelatedtechnologyandtheapplicationsinCapitalNormalUniversityarepresented.ThemostoftenusedTHz-TDSsystemasaspectroscopicmeasurementsetupinourlabisintroducedindetail,includingtheTHzradiationsource,theTHzdetectionmethodanditsmeasurement,andthecontrolsystem.THzspectraofvariousmaterialsissummarizedanddiscussed.Thesematerialsincludebutnotlimitedtotwokindsoftypicalmatter—theillegaldrugsandexplosives.Thebiologicalmacro-molecules,cosmeticsandfinechemicalmaterials,ediblepigmentsandfoodadditives,homocysteicacidandrelatedcompounds,heavyionsinsoil,Chinesemedicines,tobaccoandcrops,oilandchemicalproducts,carbonnanotubes,superconductors,andvarioussemiconductorsandtheirheterojunctions,arepresented.THzemissionsfromtheInAsandInNsemiconductorssurfacearecompared.THzspectralinvestigationofmetallicmeshstructuresissummarized.Finally,anoutlookofTHzspectroscopicapplicationsisgiven.

简介：BasedontheComplexOrthogonalLinearDispersion(COLD)code,anovellinearDiffer-entialSpace-TimeModulation(DSTM)designisproposedinthispaper.ComparedwiththeexistingnonlinearDSTMschemesbasedongroupcodes,theproposedlinearDSTMschemeiseasiertodesign,enjoysfulldiversityandallowsforasimplifieddifferentialreceiver,whichcandetectthetransmittedsymbolsseparately.Furthermore,comparedwiththeexistinglinearDSTMbasedonorthogonaldesign,ournewconstructioncanbeappliedtoanynumberoftransmitantennas.Similartootheralgorithms,theproposedschemealsocanbedemodulatedwithorwithoutchannelestimatesatthereceiver,buttheperformancedegradesapproximatelyby3dBwhenestimatesarenotavailable.

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简介：Aninfraredreal-timeimagingsystemusingDSP(digitalsignalprocessor)asthekernelofdigitalsignalprocessingboardispresented.Inthissystem,theimagingdifferenceandnonuniformitycorrectionmethodisdevelopedonthechiptakingadvantageofDSPwithhighspeed.Themethodcombineshardwareandsoftwaretogether,sothatthedifficultyforrealizingsuchamethodwithotherhardwarecanbeovercome.

简介：Inordertoachievetheinformationfusioninthetimedomainbasedontheevidencetheory,anevidencecombinationmethodinthetimedomainbasedonreliabilityandimportanceisproposedaccordingtotheideaofevidencediscount.Firstly,thedistortionofthetime-domainevidenceisjudgedbasedonsingleexponentialsmoothing.Thereal-timereliabilityoftheevidenceattheadjacenttimeisobtainedbythereal-timereliabilityassessmentmethodoftheevidencebasedonthecredibilitydecaymodel.Then,therelativeimportanceoftheevidenceattheadjacenttimeisobtainedbycomprehensivelyconsideringimprovedconflictdegreeanduncertainty.Finally,basedonthecriterionofevidencediscountandtheDempster’sruleofcombination,theevidencecombinationiscarriedouttoachievethesequentialcombinationoftime-domainevidence.Thenumericalsimulationandanalysisshowthatthismethodhasfullyembodiedthedynamiccharacteristicsoftime-domainevidencecombination,andithasstrongprocessingabilityforconflictinformationandanti-disturbingability.Theproposedmethodhasgoodapplicabilitytoinformationfusioninthetimedomain.

简介：Thestatisticcharacteristicsofchaoticsequencesgeneratedbyimprovedlogistic-mapareanalyzedanditisfoundthatimprovedlogistic-mapchaoticsequenceshavegoodcorrelationandtheycanbeusedasaddresssequencesinspread-spectrumcommunication.Thediscrete-timesynchronizationofHenonmapisimmediate.Weapplythediscrete-timesynchronizationtochaoticspread-spectrumcomuunicationandproposeanoriginalcommunicationscheme.Thesimulationshowsthattheapplicationissuccessful.

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简介：Twocomplexproperties,varyingtime-delayandblock-orientednonlinearity,areverycommoninchemicalengineeringprocessesandnoteasytobecontrolledbyroutinecontrolmethods.Aimedatthesetwocomplexproperties,anoveladaptivecontrolalgorithmthebasisofnonlinearOFS(orthonormalfunctionalseries)modelisproposed.First,thehybridmodelwhichcombinesOFSandVolterraseriesisintroduced.Then,astablestatefeedbackstrategyisusedtoconstructanonlinearadaptivecontrolalgorithmthatcanguaranteetheclosed-loopstabilityandcantrackthesetpointcurvewithoutsteady-stateerrors.Finally,controlsimulationsandexperimentsonanonlinearprocesswithvaryingtime-delayarepresented.Anumberofexperimentalresultsvalidatetheefficiencyandsuperiorityofthisalgorithm.

简介：Adifferentialmodulationschemeusingspace-timeblockcodesisputforward.Comparedwithotherschemes,ourschemehaslowercomputationalcomplexityandhasasimplerdecoder.Inthecaseofthreeorfourtransmitterantennas,ourschemehasahigherrateahighercodinggainandalowerbiterrorrateforagivenrate.Thenwemadesimulationsforspace-timeblockcodesaswellasgroupcodesinthecaseoftwo,three,fourandfivetransmitantennas.Thesimulationsprovethatusingtwotransmitantennas,onereceiveantennaandcoderateof4bits/s/Hz,thedifferentialSTBCmethodoutperformthedifferentialgroupcodesmethodby4dB.Useingthree,fourandfivetransmitantennas,onereceiveantenna,andcoderateof3bits/s/Hzareadopted,thedifferentialSTBCmethodoutperformthedifferentialgroupcodesmethodby5dB,6.5dBand7dB,respectively.Inotherwords,thedifferentialmodulationschemebasedonspace-timeblockcodeisbetterthanthecorrespondingdifferentialmodulationscheme

简介：Terahertz(THz)radiation,whosefrequencyrangesfrom0.1THzto10.0THz,hasrichscience,butlimitedtechnology.Ithaslongbeenconsideredthelastremainingscientificgapintheelectromagneticspectrum.Farfrombeingfullyexploited,itoffersgreatopportunitiesinscience,innovation,newtechnology,andpotentialapplications.

简介：Coverageholesoftenappearinwirelesssensornetworksduetosensorfailureortheinheritanceofsensor'srandomdistribution.Inthehybridmodel,mobilesensorsinthenetworkareacquiredtohealcoverageholesbytheirmobility.Whenmultiplecoverageholesappearinthesensornetworkandeachofthemhasatimerequirement(inwhichthecoverageholehastobehealed),conflictsfortherequestsofthesamemobilesensormayarise.Adistributedmultiplemobilesensorschedulingprotocol(DMS)isproposedinthispapertosolvethisproblembyfindingmobilesensorsinthetimeresponsezonedefinedbythetimerequirementofeachcoveragehole.SimulationresultsshowthatDMScanwellschedulethemobilesensorstomovetomultiplecoverageholeswithinthetimerequirement.

简介：Inthispaper,globalasymptoticstabilityforcellularneuralnetworkswithtimedelayisdiscussedusinganovelLiapunovfunction.Somenovelsufficientconditionsforglobalasymptoticstabilityareobtained.ThoseresultsaresimpleandpracticalthanthosegivenbyP.P.Civalleri,etal.,andhavealeadingimportancetodesigncellularneuralnetworkswithtimedelay.

简介：Thispaperdescribesamulti-threatreal-timeseparatingsystemforbroadbandanti-radiationmissileseeker.Itpresentsamethod,withadual-portmemoryascomparer,toperformPFandPWhardwarereal-timeseparationandtodeterminethetime-of-arrival(TOA)byuseofsequentialdifferencehistogram(SDIF).Themethodhasbeenappliedtopractice,whichhasachievedgoodresults.