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

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

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

简介：“落后就要挨打”，“落后就要服从”。短短20余年来，我们引进了迈克·波特、德鲁克、科特勒、彼得斯、柯林斯、舒尔茨等大师的管理理念，怀着朝圣的心情倾听着斯隆、韦尔奇、格鲁夫、亚柯卡、比尔·盖茨、郭仕纳的每一次嘬唇声。我们究竟师法何方？当年魏源寄望“师夷长技以制夷”，但是当兔子不打盹时，乌龟如何赶在兔子前边？柳传志的答案是，把兔子拖入泥沼。无疑，柳的智慧常常闪耀着中国传统人文价值的光芒，与柳同一辈的很多中国企业家，他们的管理精神其实也很中国。

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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：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.

简介：Thispaperstudiestheexponentialstabilityofintervaltime-varyingdynamicalsystemwithmultidelay.Bythematrixmeasureanddelaydifferentialinequality,somesufficientconditionsforexponentialstabilityofintervaltime-varyingdynamicalsystemwithmultidelayareestablished.Theseconditionsareanimprovementandextensionoftheresultsachievedinearlierpapers.Finally,anumericalexampleisgiventodemonstrateourresult.

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简介：TherobustHoocontrolproblemforuncertainstochastictime-delaysystemscontainingnonlinearactuatorsisconsidered.Theuncertaintiesinthesystemsareassumedtosatisfyspecificmatchcondition.Thetimedelaysexitstinstateaswellascontrolinput.Thenewstochasticrobuststabilizationcriterionandasufficientconditionfortheexistenceofstochasticrobuststabilizingcontrollawarederived.Thedday-independentmemorylessrobustH∞controllersareconstructedtostabilizethegivensystemsintermsofagroupoflinearmatrixinequalities.Anumericalsimulationexampleispresentedtoshowthattheproposedapproachisvalid.

简介：Inthispaper,exponentialstabilityofHopfield-typeneuralnetworkswithtime-varyingdelaysareanalyzed.ByusingtheLyapunovfunctionalmethod,sufficientconditionsareobtainedforgeneralexponentialstabilities.Atthesametime,theoutputfunctionsdonotsatisfytheLipschitzconditionsanddonotrequiretherntobedifferentialorstrictlymonotonouslyincreasing.Moreover,allresultsareestablishedwithoutassuminganysymmetryoftheconnectionmatrix.Amtmericexampleispressentedtoshowtheeffectiveofthesecriteria.

简介：Thetime-domainElectroMagnetic(EM)scatteringbyburiedobjectsindispersivemediaiscalculatedwithFD-TDmethod.TheFD-TDformulainDebyedispersivemedia(boththecomplexpermeabilityandthecomplexpermittivityaredescribedbyDebyeequations)arededuced,andtheabsorbingboundaryconditionisgiven.ThevalidityofFD-TDmethodinlossymediaisverifiedthroughcomparingtheFD-TD’sresultsandtheotherones.Thepropagationoftransientpulsesindispersivemediaisstudiedindetail.Thescatteringpulsesandthewiggletracesfortypicalburiedobjectsaregiven.

简介：AsimplePIcontrollertuningmethodforlargedead-timeprocessesispresented.First,afirst-orderplusdeadtimemodelisidentifiedonthebasisofrelayfeedbackexperiments,whichNyquistcurveisveryclosetothatoflargedead-timeprocessesoverawidefrequencyrange.Withthemodelavailable,PIcontrollerisdesignedwithanewrobustspecification.SimulationexamplesshowtheeffectivenessandfeasibilityofthepresentedPItuningmethodforlargedeadtimeprocesses.

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简介：ThispaperstudiestherobuststochasticstabilizationandrobustH∞controlforlineartime-delaysystemswithbothMarkovianjumpparametersandunknownnorm-boundedparameteruncertainties.ThisproblemcanbesolvedonthebasisofstochasticLyapunovapproachandlinearmatrixinequality(LMI)technique.SufficientconditionsfortheexistenceofstochasticstabilizationandrobustH∞statefeedbackcontrollerarepresentedintermsofasetofsolutionsofcoupledLMIs.Finally,anumericalexampleisincludedtodemonstratethepracticabilityoftheproposedmethods.

简介：Anewmeasurement-basedadmissioncontrolalgorithmtosupportQualityofService(QoS)demandisproposedforsoftreal-timeapplications.Inthealgorithm,admissiontestisperformedacrossMultipleTime-Scales(MTS)toaccuratelycapturetrafficfluctuationonvarioustime-scales.ByapplyingtheQoSrequirementsdirectlytoadmissiontest,theMTSalgorithmcanproperlymeettheQoStargetandmaximizethebandwidthutilization.

简介：Multipathtimedelayestimationisconstrainedbythewidthofthesignalcorrelationfunctionwhenusingcorrelationbasedmethods.ThispaperobtainsahighresolutiontimedelayestimationbyintroducingBurgalgorithmandMarplealgorithmofthemaximumentropypowerspectralestimationtonon-resolvablemultipathtimedelayestimatoin.Theprinciples,theperformacesandtheresultsofcomputersimulationaregiven.