简介：TherealDirectionOfArrival(DOA)varieswithtimeinmobilecommunicationsystem.Insuchsituation,theperformanceofconventionalbeamformerswillbedegradedobviously.QuantumSignalProcessing(QSP)beamformerisinsensitivetoDOAerrors,thusitcanachievestableoutputperformanceinsuchcircumstance.ThisletterverifiedtheeffectivenessandfeasibilityoftheQSPbeamformerbysimulationresults.

简介：Thispaperpresentsthedevelopmentofthebloodflowsimulationintwodimensionsovertherealgeometryofthefemoralartery.TheNavier-Stokesequationsaresolvedusingthefiniteelementmethod,toobtainthedistributionsofthebloodpressureandflowvelocityinmultipleinstantsoftimeanddifferentplacesofthefemoralarteryandthusdeterminethecurrentconditionofthebloodvessels.Thevelocityfieldshowsalaminarbehavior,where,thevelocityishigherinthecenterofthearteryanddecreasesasthebloodflowapproachesarterywalls.Inspiteofallarteryandbloodflowpropertiesnotbeingconsidered,thevaluesofpressureandvelocityobtainedarewithinthenormalranges.Finallythemodelisusedtoverifyifthereexistirregularitiesinthebloodflowinbothhealthysubjectsandsickpatients.

简介：ymboliccircuitsimulatoristraditionallyappliedtothesmall-signalanalysisofanalogcircuits.Thispaperestablishesasymbolicbehavioralmacromodelingmethodapplicabletobothsmall-signalandlarge-signalanalysisofgeneraltwo-stageoperationalamplifiers(op-amps).Theproposedmethodcreatesatwo-poleparametricmacromodelwhoseparametersareanalyticalfunctionsofthecircuitelementparametersgeneratedbyasymboliccircuitsimulator.Amomentmatchingtechniqueisusedinderivingtheanalyticalmodelparameter.Thecreatedparametricbehavioralmodelcanbeusedforop-ampsperformancesimulationinbothfrequencyandtimedomains.Inparticular,theparametricmodelsarehighlysuitedforfaststatisticalsimulationofop-ampsinthetime-domain.Experimentresultsshowthatthestatisticaldistributionsoftheop-ampslewandsettlingtimecharacterizedbytheproposedmodelagreewellwiththetransistor-levelresultsinadditiontoachievingsignificantspeedup.

简介：ThecalculationprincipleofsampledFBG,whichiscalledtransfermatrixmethod,isanalyzedandthesimulationsoftwareisdesigned.ThesampledFBGissimulatedwiththesoftwarewedesignedandisfabricatedbyourselves.Theexperimentresultfitswellwiththesimulatedone.ItisconcludedthattoimprovetherefractivemodulationindexisaneffectivewaytofabricateasampledFBGwithhigh-reflectivity.

简介：

简介：Anewbipolarjunctionfield-effecttransistor(BJFET)wasdescribed.ThetheoreticalanalysisandcomputersimulationofBJFETobstructivecharacteristicareachieved.ThegatebiasvoltageaffectstheBJFETobstructivevoltagegreatly.TheBJFETobstructivecharacteristicisrelevanttostructureparametersofchannelwidthWandchannellengthL.Thedecrease-bias-voltageoperationcanweakenthedeviceobstructivecharacteristic.TheforwardturnindeviceforwardobstructiveregioncanalsoaffecttheBJFETobstructivecharacteristic.BJFEThasagoodhightemperatureobstructivecharacteristicandcanbeapplyingtohightemperaturestatusashighvoltageswitchdevices.

简介：Inordertobetterassesstheperformanceofwirelesscommunicationsystems,itisdesirabletoproducemultipleRayleighfadingenvelopeswithspecifiedcorrelations.Inthispaper,weanalyzetheoreticallyaprocedurewhichgeneratescorrelatedGaussianrandomvariablesfromindependentGaussianrandomvariablesandgiveaphysicalexplanationforthelimitationofthisprocedure.Then,basedonsomeuncorrelatedRayleighfadingenvelopes,asimplebutefficientprocedureforgeneratinganarbitrarynumberofcross-correlatedRayleighfadingenvelopesisproposed.Simulationresultsandcomputationalcomplexityanalysisarepresented,whichshowthattheproposedmethodhassomeadvantages,suchashighaccuracy,lowcomputationalcomplexityandeasyimplementation,overtheconventionalsimulationmethod.

简介：一个精确光电二极管电路宏模型为SPICE设备模拟被建议。宏模型的定义和实现基于搬运人静止连续性方程。在这个宏模型，光电二极管是二为光电流输出的三根大头针，为轻紧张输入的大头针和其它的一台设备，它代表在光电流和事件光之间的关系。建议宏模型的有效性与报导实验数据相比与itsPSPICE模拟结果被表明。

简介：Intheevaluationofsomesimulationsystems,onlysmallsamplesdataaregottenduetothelimitedconditions.Inallusiontotheevaluationproblemofsmallsampledata,anintervalestimationapproachwiththeimprovedgreyconfidencedegreeisproposed.Onthebasisofthedefinitionofgreydistance,threekindsofdefinitionofthegreyweightforeverysampleelementingreyestimatedvalueareputforward,andthentheimprovedgreyconfidencedegreeisdesigned.Inaccordancewiththenewconcept,thegreyintervalestimationforsmallsampledataisdeduced.Furthermore,thebootstrapmethodisappliedformoreaccurategreyconfidenceinterval.Throughresamplingofthebootstrap,numeroussmallsampleswiththecorrespondingconfidenceintervalscanbeobtained.Thenthefinalconfidenceintervaliscalculatedfromtheunionofthesegreyconfidenceintervals.Intheend,thesimulationsystemevaluationusingtheproposedmethodisconducted.Thesimulationresultsshowthatthereasonableconfidenceintervalisacquired,whichdemonstratesthefeasibilityandeffectivenessoftheproposedmethod.

简介：AnapproachisproposedtorealizeadigitalchannelizedreceiverinthefractionalFourierdomain(FRFD)forsignalinterceptapplications.ThepresentedarchitecturecanbeconsideredasageneralizationofthatinthetraditionalFourierdomain.Sincethelinearfrequencymodulation(LFM)signalhasagoodenergyconcentrationintheFRFD,bychoosinganappropriatefractionalFouriertransform(FRFT)order,thepresentedarchitecturecanconcentratethebroadbandLFMsignalintoonlyonesub-channelandthatwillpreventitfromcrossingseveralsub-channels.Thustheperformanceofthesignaldetectionandparameterestimationafterthesub-channeloutputwillbeimprovedsignificantly.Thecomputationalcomplexityisreducedenormouslyduetotheimplementationofthepolyphasefilterbankdecomposition,thustheproposedarchitecturecanberealizedasefficientlyasintheFourierdomain.Therelatedsimulationresultsarepresentedtoverifythevalidityofthetheoriesandmethodsinvolvedinthispaper.

简介：

简介：顺序的蒙特卡罗模拟方法被介绍给对microgrid，和Weibuil分布的可靠性评价风速度模型被造模仿时时弯屈与一个二状态的可靠性模型相结合的一个特定的site.Wind汽轮机发电机模型的速度被用于蒙特卡罗模拟方法，并且结果证明风汽轮机可靠性与顺序的蒙特卡罗simulation.A为工作建模很好微煤气的汽轮机的二状态的可靠性模型和从IEEErelia的一个负担模型

简介：SyntheticApertureRadar(SAR)imagingofoceansurfacefeaturesisstudied.ThesimulationoftheturbulentandvorticalfeaturesgeneratedbyamovingshipandSARimagingofthesewakesiscarriedout.Theturbulentwakedampingtheoceansurfacecapillarywavesmaybepartiallyresponsibleforthesuppressionofsurfacewavesneartheshiptrack.Thevortexpairgeneratingachangeinthelateralflowfieldbehindtheshipmaybepartiallyresponsibleforanenhancementofthewavesneartheedgesofthesmootharea.Thesehydrodynamicphenomenaaswellasthechangesofradarbackscattergeneratedbyturbulenceandvortexaresimulated.AnSARimagingmodelisthenusedonsuchoceansurfacefeaturestoprovideSARimages.Comparisonoftwoships'simulatedSARimagesshowsthatthewakefeaturesaredifferentforvariousshipparameters.

简介：ThetheoreticalSpectralresponseformulaoftheN^+-N-I-P^+siliconphotodetectorwithhigh/lowemissionjunctionisgiven.Atthesametime,consideringtheprocessrequirements,theoptimunstructureparametersofsiliconphotodetectorareobtainedbynumericalcalculationandsimulation.Undertheconditionoftheseoptimumstructureparameters,theresponsivityofthesiliconphotodetectorwillbe0.48A/Wat650nm.

简介：热管理是为射出二极管的高力量的光的关键技术之一(带)进入一般照亮域。成功的热管理取决于最佳的包装结构和选择包装材料。在这份报纸，铝作为底层被采用带，3

简介：AnoveltunablechirpedfiberBragggratingtechnologyisproposedandsimulatednumericallybyMatlab.Ifweadhereauniformfibergratingwithsupermagnetostrictivefilmandexposetheminanon-uniformmagneticfield,theperiodofthegratingcanbechangedwiththestrainimposedonitbythemagnetostrictiveeffect.Thechirpedcharacteristicscanbetunedbychangingthemagneticfiledwhichisveryflexibleindesigning.

简介：Anadaptivestatisticmodelformobilecommunicationchannelisstudiedandsimulatedinthispaper.Accordingtothemodelparameters,anerrorsequencedescribingthelongbursterrorcharacteristicsofthemobilecommunicationchannelisgeneratedonacomputer.Atestmethodusingthresholdtechniqueispresentedtoverifytheaccuracyoftheadaptivechannelmodel.

简介：ToperformthegroundtestofaspaceborneSyntheticApertureRadar(SAR)system,anechosimulatorwiththecharacteristicsofmultimode,multi-assemblage,andrealtimeisproposedinthispaper.Ahardwareplatformofthereal-timeechosimulatorbasedontheVPXbusisdesigned.Withthisplatform,real-timemulti-pointechogenerationandscenariotargetsechogenerationcanbeachievedbythereal-timesignalprocessinginFieldProgrammableGateArray(FPGA),utilizingtheparameterscalculatedbytheindustrycomputers.Furthermore,thisplatformcanoutputdifferentsignalsifitisexpandedtomulti-channels,makingitpossiblefortheassignmentofechogenerationandtestindifferentspaceborneSARmodes.ThetestresultswiththeactualSARsystemshowthatthisplatformcansatisfythesystemrequirementsandisnowusedinpractice.

简介：TheperformancesofhighpowerEr/Ybcodopedfiberlinearcavitylasersareinvestigatednumerically.ThenumericalanalysisisbasedontheiterativesolutionofrateequationsforpopulationdensityoftheEr/Ybions.Thebehaviorsofco-pumpandcounter-pumpmethodsarecontrasted.Dependenceofoutputpoweroninputpumppower,outputreflectivity,operatingwavelengthandactivefiberlengthissimulated,respectively.HighconversionefficiencyEr/Yblaseroutputisobtainedinsimulationsandexperiments.

简介：ThespectraoffiberBragggrating(FBG)ininhomogeneousstrainfieldsaredistortedduetoitsinhomogeneityofboththeperiodsandtheeffectiverefractiveindex.ThecouplemodetheoryandtheRunge-KuttamethodcanbeemployedforexactsimulationofthespectrumofBragggratinginsuchfield,buttheconvergencespeedisslow.Ontheotherhand,althoughthetransfermatrixmethodcouldbeusedwithhigherconvergencespeed,theprecisionispoorbecauseoftheneglectofthegradsofstrainchange.ByimprovingtheFBGequivalentperiod,anovelsimulationmethodbasedonamodifiedtransfermatrixmethodisproposed,whichhastheadvantageofquick-convergenceaswellasgoodaccuracy.