简介：Themeasurementtechniquesoffemtosecondspectroscopyareeffectivemethodtoinvestigateultrafastdynamics,theyarewidelyusedinthefieldsofphysics,chemistryandbiology.Inthispaper,theprinciple,experimentsetupandtheapproachestodealwiththeexperimentdatawerepresented.Thendifferentmeasurementtechniquessuchastransientabsorptionspectroscopy,photonechoes,opticalKerreffectanddegeneratefour-wavemixingwereexplainedwithspecialexamples.Atlast,theapplicationprospectofmeasurementtechniquesoffemtosecondspectroscopywasforecasted.

简介：Whenthereturnscomefromtwoormoreunresolvedtargets(thesignalsarenotresolvedinthefrequencyortimedomains)inamonopulseradarsystem,thedirection-of-arrival(DOA)estimateindicatedbythemonopulseratioisnotthetrueinformationofthetrackedtarget.Thenthetrackingsystemsisinfluenced.Anapproachhasbeenproposedtodetectwhetherthereturnscomefromasingletargetortwounresolvedtargets.Theaboveapproachisextendedfromtwotothreeunresolvedtargets.Thesimulationindicatesthatthedetectionprobabilityunderthethreeunresolvedtargetsisnotsuretoexceedthedetectionprobabilityunderthetwounresolvedtargets.

简介：Thispaperpresentsafault-detectionmethodbasedonthephasespacereconstructionanddataminingapproachesforthecomplexelectronicsystem.TheapproachforthephasespacereconstructionofchaotictimeseriesisacombinationalgorithmofmultipleautocorrelationandΓ-test,bywhichthequasi-optimalembeddingdimensionandtimedelaycanbeobtained.Thedataminingalgorithm,whichcalculatestheradiusofgyrationofunit-masspointaroundthecentreofmassinthephasespace,candistinguishthefaultparameterfromthechaotictimeseriesoutputbythetestedsystem.Theexperimentalresultsdepictthatthisfaultdetectionmethodcancorrectlydetectthefaultphenomenaofelectronicsystem.

简介：Asimpleinstrumentforthereal-timemeasurementofalgaeconcentrationandmappingdescribed.Theinstrumentusesapulsedshortarcxenonflashlampastheexcitedlightsources.Boththeexcitinglightandthefluorescencefromalgaechlorophyllaretransmittedalongafiberbundle.Themeasurementsensivitivityisanalyzedandtheexperimentresultisgiven.Theinstrumentispracticaltoin-situmeasurementatsea.

简介：DespiteextensiveresearchonR-trees,mostoftheproposedschemeshavenotbeenintegratedintoexistingDBMSowingtothelackofprotocolsofconcurrencycontrol.R-linktreeisanacceptabledatastructuretodealwiththisissue,butproblemslikephantomstillexist.Inthispaper,wefocusonaconflictdetectionschemebasedonR-linktreeforcompleteconcurrencycontrol.Anin-memoryoperationcontrollistisdesignedtosuspendconflictingoperations.Themainfeaturesofthisapproachare(1)itcanbeimplementedeasilyanddoesnotneedanyextrainformation;(2)Nodeadlocksareinvolvedinlockingscheme;(3)Non-conflictingoperationsarenotrestricted;and(4)PhantomproblemsinR-linktreeareavoidedthroughbeforehandpredication.Theexperimentresultsshowthatthisschemeiscorrectandgainsbettersystemperformance.

简介：Basedonthewhiteningpropertyofwavelettransformationfor1/fnoise,thispaperaddressestheproblemofdetectingdeterministicsignalsinthepresenceof1/ffractalnoise.Thetransferfunctionofwhiteningfilterisprovidedaswellastheconditionforwhitening.ThereceiverstructurebasedonKarhunen-Loeveexpansionandthedecisionrulearealsogiven.Finallyperformanceofthedetectorisanalyzed.

简介：Thetructure,equivalentcircuit,noisesoucesofsiliconphotodiodeareanalyzed.Inordertoimprovethemeasuringlinearity,wemustchoosethesiliconphotodiodewithalargeRd,smallRsandI0andunderanoperationstateofoutputshort-circuit.Wemustlettheoperationamplifierworkinthecurrent-voltagetransferform.Alsoweanalyzedtheeffectsoftheinputnoisevoltage,theinputnoisecurrent,theinputoffsetvoltage,theinputoffsetcurrentoftheoperationamplifierandthenoisesofthesiliconphotodiodeonthecombinedcircuitoftheoperationamplifierwiththesiliconphotodiode.Consideringthesefactors,wecandesignthedetectivecircuitwithhighresponse,sensitivity,stability,linearityandSNR.

简介：FractionalBrownianmotion,continuouseverywhereanddifferentiablenowhere,offersaconvenientmodelingforirregularnonstationarystochasticprocesseswithlong-termdependenciesandpowerlawbehaviorofspectrumoverwiderangesoffrequencies.Itshowshighcorrelationatcoasescaleandvariesslightlyatfinescale,whichissuitableforandsuccessfulindescribingandmodelingnaturalscenes.Ontheotherhand,man-madeobjectscanbeconstructivelywelldescribedbyusingasetofregularsimpleshapeprimitivessuchasline,cylinder,etc.andarefreeoffractal.Basedonthedifference,weprovideamethodtodiscriminateman-madeobjectsfromnaturalscenes.Experimentsareusedtodemonstratedthegoodefficiencyofthedevelopedtechnique.

简介：Torealizetheon-linemeasurementandmakeanalysisonthedensityofalgaeandtheirclusterdistribution,thefluorescentdetectionandfuzzypatternrecognitiontechniquesareused.Theprincipleoffluorescentfiber-opticdetectionisgivenaswellasthemethodoffuzzyfeatureextractionusingaclassofneuralnetwork.

简介：FractionalBrownianmotion,continuouseverywhereanddifferentiablenowhere,offersaconvenientmodelingforirregularnonstationarystochasticprocesseswithlong-termdependenciesandpowerlawbehaviorofspectrumoverwiderangesoffrequencies.Itshowshighcorrelationatcoarsescaleandvariesslightlyatfinescale,whichissuitableforandsuccessfulindescribingandmodelingnaturalscenes.Ontheotherhand,man-madeobjectscanbeconstructivelywelldescribedbyusingasetofregularsimpleshapeprimitivessuchasline,cylinder,etc.andarefreeoffractal.Basedonthedifference,amethodtodiscriminateman-madeobjectsfromnaturalscenesisprovided.Experimentsareusedtodemonstratethegoodefficiencyofdevelopedtechnique.

简介：AsetofdiscretepointsobtainedfromauditrecordsonabehaviorsessionisprocessedwithFouriertransform.ThecriterionofselectingFouriertransformcoefficientsisintroduced,andisusedtofindaunifiedvaluefromthesetofcoefficients.Thisunifiedvalueiscomparedwithathresholdtodeterminewhetherthesessionisabnormal.Finallysimpletestresultsarereported.

简介：因为煤气的红外线的吸收光谱线宽仅仅是在1000占据几的来源紧张的几纳米，它是平的不到光的噪音来源。煤气的吸收的信号在噪音被沉没，因此直接与光谱吸收测量气体的集中是不可能的。根据CH_4气体的差别吸收系统的原则和参数，一个察觉电路由lock-inamplifier组成了被设计。实验结果显示察觉电路能满足整个系统的需求，并且限制集中是150X10~(-6)。

简介：Thispaperanalyzesthelock/capturebehaviorofconstantmodulusapproach(CMA)forblindmultiuserdetection.ConditionsunderwhichCMAlocksonthedesiredsignalandwhenitcapturestheinterfererarederived.

简介：InCDMAmobilecommunicationsystems,multipleaccessinterferencecanbecanceledbymultiuserdetectiontechnique.TheDegradationbychannelfadingcanbereducedbydiversityreception.Thispaperinvestigatesafamilyofmultiuserreceiversthatcombineddecor-relatingdetection,antennadiversityandRAKEmultipathdiversity.Theperformanceofthemultiuserreceiversisanalyzed.Theresultsdemonstrateasignificantincreaseintheperformanceofthereceiversbyusingmultiuserdetectionanddiversityreception.

简介：Thepurposeofthispaperistodevelopahighspeeddetectionschemeformovingand/orstationarypointtargetsinamultitargetenvironmentasregisteredinanIRimagesequence.Aniterativeapproximate3-Dlinesearchingalgorithmbaseduponthegeometricrepresentationoflines(fornon-maneuveringtargetsinspace)ina3-Dspaceisderived.Theconvergencyofthealgorithmisproved.Ananalysisisperformedofthetheoreticaldetectionperformanceofthealgorithm.ThestatisticalexperimentresultsshowhigheffectivenessandcomputationalefficiencyofthealgorithminthecaseoflowSNR.Theideamaybeemployedtosatisfythereal-timeprocessingrequirementofanIRsystem.

简介：Thispaperpresentsanewmethodfordetectionofedgesindigitalangiographicimages.Itisfoundthatvariancesoflocalregionsacrossedgesofimagesarestatisticallydifferentfromthatofthosewherenoedgeiscrossed.Thisdifferencecanbeutilizedforthedetectionofedgesofangiographicimages.Analgorithmbasedonlocalvarianceisproposed.Asaresult,theedge-detectionalgorithmisnotsensitivetonoiseandlow-leveltexturesofimages.Acomputerprogrambasedonthenewalgorithmhasbeendevelopedandusedbyseveralhospitals.

简介：AmixedschemebasedonWaveletTransformation(WT)isproposedforimageedgedetection.TheschemecombinesthewavelettransformandtraditionalSobelandLoG(LaplacianofGaussian)operatoredge-detectionalgorithms.Theprecisetheoryanalysisisgiventoshowthatthewavelettransformationhasanadvantageforsignalprocessing.SimulationresultsshowthatthenewschemeisbetterthanonlyusingtheSobelorLoGmethods.Complexityanalysisisalsogivenandtheconclusionisacceptable,thereforetheproposedschemeiseffectiveforedgedetection.

简介：AstheProjectionApproximationSubspaceTrackingwithdeflation(PASTd)algorithmissensitivetoimpulsivenoise,animprovedsubspacetrackingalgorithmisproposedandappliedtoblindadaptivemulti-userdetection.SimulationresultsshowthattheimprovedPASTdalgorithmnotonlyremainsthepropertiesoftheconventionalPASTdalgorithm,butalsohasgoodBitErrorRate(BER)performanceinimpulsivenoiseenvironment,thusitcaneffectivelyimprovethesystemperformance.

简介：当它在察觉到的fiberBragg栅栏(FBG)被使用时，波长部门multiplex有明显的优点因为各种各样的数量的同时的测量，而是传感器的数字被小橇和解调器的带宽通常限制。相同纤维Bragggrating为火报警系统被介绍，收集相同FBGsensors的信号的方法被描述。实验结果显示出那，相同FBG察觉到。传感器的数字极大地在一纤维增加联合了，精确能被保证为火报警系统满足要求。

简介：ThepaperpresentsanalgorithmofautomatictargetdetectioninSyntheticApertureRadar(SAR)imagesbasedonMaximumAPosteriori(MAP).Thealgorithmisdividedintothreesteps.First,itemploysGaussianmixturedistributiontoapproximateandestimatemulti-modalhistogramofSARimage.Then,basedontheprincipleofMAP,whenaprioriprobabilityisbothunknownandlearnedrespectively,thesamplepixelsareclassifiedintodifferentclassesc={target,shadow,background}.Last,itcomparestheresultsoftwodifferenttargetdetections.Simulationresultspreferablyindicatethatthepresentedalgorithmisfastandrobust,withthelearnedaprioriprobability,anapproachtotargetdetectionisreliableandpromising.