简介:Inanactivenetwork,userscaninsertcustomizedactivecodesintoactivenodestoexecute.Thusitneedsmoreresourcesthanthoserequiredbyconventionalnetworks,andtheseresourcesmustbeeffectivelymonitoredandmanaged.ManagementpoliciesinexistingOSsaretoocomplicatedtoapplytosimpleactivepackets.Inthispaper,wepresentnewresourcesmanagementpoliciesthataremainlyadopedtomanageCPU,storageandtransmissionbandwidth.Namely,weuseSPFalgorithmtoscheduleandprocessactivepackets,andimportanintervalqueuemethodtoallocatetransmissionbandwidth,andusefeedbackmechanismtocontrolcongestion.Atthesametime,wedesignsomeexperimentsonprototypesystemswithandwithoutresourcesmanagementpoliciesrespectively.Theexperimentsresultsshowthatmanagementpoliciespresentedbyuscaneffectivelymanageresourcesinactivenodesandcanimprovetheperformanceofactivenetworks.
简介:ToovercomethelimitationoflowimagesignalswingrangeandlongresettimeinfourtransistorCMOSactivepixelimagesensor,achargepumpcircuitispresentedtoimprovethepixelresetperformance.Thechargepumpcircuitconsistsoftwostageswitchcapacitorserialvoltagedoubler.Cross-coupledMOSFETswitchstructurewithwellcloseandopenperformanceisusedinthesecondstageofthechargepump.Thepixelresettransistorwithgatevoltagedrivenbyoutputofthepumpworksinlinearregion,whichcanaccelerateresetprocessandcompleteresetisachieved.Thesimulationresultsshowthatoutputofthechargepumpisenhancedfrom1.2to4.2Vwithvoltageripplelowerthan6mV.Thepixelresettimeisreducedto1.14nsindark.Imagesmearduetonon-completelyresetiseliminatedandtheimagesignalswingrangeisenlarged.ThechargepumpissuccessfullyembeddedinaCMOSimagesensorchipwith0.3×106pixels.
简介:Aimingatthetraditionalpassivedeceptionmodels,thispaperconstructsaDecoyPlatformbasedonIntelligentAgent(DPIA)torealizedynamicdefense.Thepaperexploresanewdynamicdefensemodelbasedonactivedeception,introducesitsarchitecture,andexpatiatesoncommunicationmethodsandsecurityguaranteeininformationtransference.SimulationresultsshowthattheDPIAcanattracthackeragilityandactivity,leadabnormaltrafficintoit,distributealargenumberofattackdata,andensurerealnetworksecurity.
简介:Wedemonstrateanelectric-controlledterahertz(THz)modulatorwhichcanbeusedtorealizeamplitudemodulationofterahertzwaveswithslightphoto-doping.TheTHzpulsetransmissionwasefficientlymodulatedbyelectricallycontrollingthemonolayersilicon-baseddevice.Themodulationdepthreached100%almostwhentheappliedvoltagewas7Vatanexternallaserintensityof0.6W/cm2.Thesaturationvoltagereducedwiththeincreaseofthephoto-excitedintensity.InaTHzcontinuouswave(CW)system,asignificantfallinbothTHztransmissionandreflectionwasalsoobservedwiththeincreaseofappliedvoltage.ThisreductionintheTHztransmissionandreflectionwasinducedbytheabsorptionforelectroninjection.Theresultsshowthatahigh-efficiencyandhighmodulationdepthbroadbandelectric-controlledterahertzmodulatorinapureSistructurehasbeenrealized.
简介:Basingonthestatevariablemethod,ablockdiagramofthecurrent-modebiquadactivecircuitwasproposed,whoseintegratorswererealizedusingthreekindsofactiveelementssuchasoperationalamplifier,secondgenerationcurrentconveyorsandoperationaltransconduc-tanceamplifiers-electriccapacity.Thecharacteristicsofeachcircuitwereanalyzed.
简介:Anactiveandreactivecombinedspotpricemodelandthecorrespondingalgorithmareintroducedinthispaperbasedonthetheoryofoptimalpowerflow.Differentfromthetraditionaleconomicdispatchinthefieldofspotprice,theobjectivefunctionistominimizegenerationcostsbasedonpricingreactivepower.Thenconsideringthecharacteristicsofwindturbines,processingmethodsofwindfarmsinoptimalpowerflowisdiscussed.Finally,thefeasibilityofthemodelandthealgorithmisverifiedthroughthesimulationresultsofIEEE30system.
简介:Reactioncontrolsystem(RCS)isapowerfulandefficientactuatorforspacevehiclesattitudecontrol,whichistypicallycharacterizedasapulsedunilateraleffectoronlywithtwostates(off/on).Alongwithinevitableinternaluncertaintiesandexternaldisturbancesinpractice,thisinherentnonlinearcharacteralwayshindersspacevehiclesautopilotfrompursuingprecisetrackingperformance.Comparedtomostofpre-existingmethodologiesthatpassivelysuppresstheuncertaintiesanddisturbances,adesignbasedonpredictivefunctionalcontrol(PFC)andgeneralizedextendedstateobserver(GESO)isfirstlyproposedforthree-axisRCScontrolsystemtoactivelyrejectthatwithnorequirementforadditionalfuelconsumption.ToobtainahighfidelitypredictivemodelonwhichtheperformanceofPFCgreatlydepends,thenonlinearcouplingmultiple-inputmultiple-output(MIMO)flightdynamicsmodelisparameterizedasastate-dependentcoefficientform.Andbasedonthat,aMIMOPFCalgorithminstatespacedomainforaplantofarbitraryordersisdeducedinthispaper.Theinternaluncertaintiesandexternaldisturbancesarelumpedasatotaldisturbance,whichisestimatedandcancelledtimelytofurtherenhancetherobustness.Thecontinuouscontrolcommandsynthesisedbyabovecontroller-rejectortandemisfinallymodulatedbypulsewidthpulsefrequencymodulator(PWPF)toon-offsignalstomeetRCSrequirement.Therobustnessandfeasibilityoftheproposeddesignarevalidatedbyaseriesofperformancecomparisonsimulationswithsomeprominentmethodsinthepresenceofsignificantperturbationsanddisturbances,aswellasmeasurementnoise.
简介:Inthispaper,wepresentanovelregion-basedactivecontourmodelbasedonglobalin-tensityfittingenergyinavariationallevelsetframework.Meanwhile,aninternalenergytermisin-troduced,anditforcesthelevelsetfunctiontobeclosetoasigneddistancefunction.Imageglobalinformationutilizedefficientlymakestheproposedmodelinsensitivetonoise,andtheintroducedpenaltytermcanavoidthecostlyre-initializationfortheevolvinglevelsetfunction,whichnotonlyspeedsupthecontourevolvement,butalsoimprovesaccuracyofthefinalcontour.Comparisonswithotherclassicalregion-basedmodels,suchasChan-VesemodelandRegion-ScalableFitting(RSF)model,showtheadvantagesofourmodelintermsofefficiencyandaccuracy.Moreover,themodelisrobusttonoise.
简介:对数的反应互补金属氧化物半导体(互补金属氧化物半导体)图象传感器提供一个宽动态范围,但是它的缺点是简单固定模式噪音(FPN)的缺乏取消计划。设计与高有活力的范围和高输出秋千是一个新奇对数的活跃象素传感器(APS)。第一,混合模型APS的操作原则被介绍。象素能由选择合适的控制信号在三个操作模式工作。然后,对数的APS的FPN来源被分析,并且双sampled技术被实现减少FPN。根据模拟结果,最后,布局被设计并且过去了设计统治支票(DRC),电子规则检查(ERC)和布局对图解(LVS)确认,和模拟以后的结果是基本上与模拟结果一致。新对数的APS的动态范围能到达大约140dB;并且产量秋千是大约750mV。结果证明由使用两倍取样的技术,大多数FPN被消除,动态范围被提高。
简介:Basedonuser’sin-degreedistribution,traditionalrankingalgorithmsofuser’sweightusuallyneglecttheconsiderationsofthedifferencesamonguser’sfollowersandthefeaturesofuser’stweets.Inordertoanalyzethefactorswhichimpactonuser’sweight,undertheanalysisofthedatacollectedfromSINAMicroblognetwork,thispaperdiscoversthatuserinfluenceandactivedegreesarethedominantfactorsforthisissue.Theproposedalgorithmevaluatesuserinfluencebyuser’sfollowernumber,theinfluenceofuser’sfollowersandthereciprocitybetweenusers.User’sactivedegreeismodeledbyuser’sparticipationandthequalityofuser’stweets.Themodelsaretestedbydifferentdatagroupstoconfirmtheparametersforthefinalcalculation.Eventually,thispapercomparesthecomputationalresultswiththeuser’srankingordergivenbytheSINAofficialapplication.Theperformanceofthisalgorithmpresentsastrongerstabilityonthefluctuantrangeofthevalueofuser’sweight.
简介:Anovelactivecontourmodelisproposed,whichincorporateslocalinformationdistributionsinafuzzyenergyfunctiontoeffectivelydealwiththeintensityinhomogeneity.Moreover,theproposedmodelisconvexwithrespecttothevariablewhichisusedforextractingthecontour.Thismakesthemodelindependentontheinitialconditionandsuitableforanautomaticsegmentation.Furthermore,theenergyfunctionisminimizedinacomputationallyefficientwaybycalculatingthefuzzyenergyalterationsdirectly.Experimentsarecarriedouttoprovetheperformanceoftheproposedmodeloversomeexistingmethods.Theobtainedresultsconfirmtheefficiencyofthemethod.
简介:Anovelsurface-enhancedRamanscattering(SERS)-activesubstratebasedonAunanoparticles(AuNPs)-coatedsilvernanowire(AgNW)isobtainedbyaneffectiveandsimplemethod.TheresultsshowthatthehybridstructurespreparedbythismethodarepowerfulSERS-activesubstratesforthedetectionofmalachitegreen(MG)moleculeswiththelimitof1nmol/L.Theexcellentenhancingabilitymainlycomesfromtwokindsofhotspots.OneisfromthegapsamongtheadjacentAuNPs,andtheotheristhepresenceofzonebetweenAuNPsandAgNW.Inparticular,theAuNPs-coatedAgNWcanbeviewedthroughtheobjectiveoftheconfocalRamanspectrometerduetothelengthoftheAgNWreachesmicrons,whichcanimprovetherepeatabilityofdetection.Moreover,itisofgreatsignificanceinresearchofSERSmechanismandapplication.
简介:Thisletterintroducesa4thorderactiveRCcomplexfilterwith1.5MHzcenterfrequencyand1MHzbandwidth.Thetotalharmonicdistortionofthefilterislessthan–60dBandtheimagerejectionratioisgreaterthan60dB.Anoveltechniqueisalsoproposedinthislettertoautomaticallyadjustthevariationofthetimeconstant.Theadvantagesoftheproposedmethodareitshighprecisionandsimplicity.Using5bitscontrolwords,thetuningerrorislessthan±1.6%.
简介:Ahigh-Qmicrowavephotonicfilterusingasemiconductoropticalamplifier(SOA)-basedmode-lockingfiberringlaserisproposed,analyzedandexperimentallydemonstrated.Theproposedmicrowavephotonicfiltercanrealizeahigh-Qfrequencyresponse,itiscompactwithoutanopticalsource,anditcanbeeasilytunedbyadjustinganopticalvariabledelaylineinaringcavity.AresultwithaQ-factorofabout236andarejectionratioofabout45dBisobtained.Themeasuredresultsandthetheoreticalestimationsagreeverywell.