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简介：Basedontheconceptofthermo-radiationtheory,theprincipleofnon-contacttemperaturemeasurementwithopticalfiberisintroduced.Thenewpyrometeroperatesonthebasisoftwo-waytemperaturesignaldivisioncalculationviamrcrocom-putersignalprocessingsystem.Itsdesignmethodandsmartconstructionoftheelectro-opticalsystempossesssuchadvantagesashighmeasurementaccuracy,freedomfromelectricinterferenceandotherperturbationsaswellasflexibleapplications.Theindica-tionscaleofthemeasuredtemperatureandexperimentresultsaregiveninthispaper.

简介：Theprincipleofnewopticalfibrepressuretransducerisanalysed,andinge-niousdesignschemeofthistransducerisvigen.Thisnewtransducerspecimenisprovidedwithfollowingcharacteristics;experimentaltransmittingdistanceis20m(actuallyupto1000m);systemsensitivityis0.1mV/Pa;powerconsumptionoftheprobeislessthan125μW.Finally,somepointsoftheappraisementaregiveninthispaper.

简介：Anopticalfibertransmittingphotoelectriccouplingcurrenttransformerhasbeendeveloped.Intheenvironmentofhighvoltageandelectromagneticfields,thisdeviceischaracterizedbyhighinsulation,highreliability,smallmassandhighanti-interference.Thestructuredesignandopertingprincipleofthesystemareintroduced,measurementerrorsareanalyzedandexperimentalresultsaregiven.

简介：Theoperationprincipleofanovelportableoilingredientinstrumentisintroduced.Usingthetheoryoffluorescencemeasurement,thisinstrumentcancarryoutfastandconsecutivein-situdetectionofoilingredientinseawater,confirmingfastandcorrectlythesituationofoilcontaminationsuchastheconcentrationandthearea,etc.Thelowestdetectableconcentrationfortheinstrumentis1×10-8g/mlwiththeprecisionoflessthan3%.Theresultsofexperimentandpracticeshowthatthissystemhaswellwater-sealedcharacteristicandrepeatability.

简介：Apiezoelectricaccelerometerwithopticalfibertomeasurethedynamicparameterof3dimensionsispresented.TheoperationequationsonX,YandZaxesaredivided,andthetestresultsof3dimensionalsensitivitiesandfrequencyresponse,aregivenaswellasexperimentresultsofvibrationtestwiththissetup.

简介：1供应链管理当今全球已步人经济一体化和因特网新经济时代,市场的变化正在不断加快,需求的不确定性正在不断加大,势必要求信息交换快捷与准确,产品上市快速与及时.原来传统的企业管理模式--"纵向一体化"管理已不适应新时代的要求.

简介：AnovellinkadaptationschemeusinglinearAutoRegressive(AR)modelchannelestimationalgorithmtoenhancetheperformanceofautorateselectionmechanisminIEEE802.11gisproposed.ThisschemecanovercomethelowefficiencycausedbytimeintervalbetweenthetimewhenReceivedSignalStrength(RSS)ismeasuredandthetimewhenrateisselected.Thebestrateisselectedbasedondatapayloadlength,frameretrycountandtheestimatedRSS,whichisestimatedfromrecordedRSSs.Simulationresultsshowthattheproposedschemeenhancesmeanthroughputperformanceupto7%,insaturationstate,andupto24%infiniteloadstatecomparedwiththosenon-estimationschemes,performanceenhancementsinaveragedroprateandaveragenumberoftransmissionattemptsperdataframedeliveryalsovalidatetheeffectivenessoftheproposedscheme.

简介：

简介：Numericallyanalyzedisthetransmissionperformanceoftheopticalmillimeter(mm)-wavegeneratedbyfrequencyup-conversionviaaphasemodulatoralongthedispersivefiber.60GHzmm-wavesub-carrier(SC)signalscanbeobtainedafterfibertransmission,simultaneously,thephase-modulatedsignalscanbeconvertedtotheintensity-modulatedones.Thenumericalresultsshowthattheopticalmm-waveatfadingloopshasbetterperformance,andtheeyediagramstillkeepsopenwhenopticalmm-wavesignalistransmittedover98km.

简介：Asanimportantapplicationresearchtopicoftheintelligentaviationmulti-station,collaborativedetectingmustovercometheproblemofscoutingmeasurementwithstatusof“fragmentation”,andtheNP-hardnessproblemofmatchingassociationbetweentargetandmeasurementintheprocessofscoutingtodata-link,whichhascomplicatedtechnicalarchitectureofnetworkconstruction.Inthispaper,takingadvantageofcooperationmechanismonsignallevelintheaviationmulti-stationsympatheticnetwork,amethodofobtainingtargettimedifferenceofarrival(TDOA)measurementusingmulti-stationcollaborativedetectingbasedontime-frequencyassociationisproposed.Themethodcannotonlyachievematchingbetweentargetanditsmeasurement,butalsoobtainTDOAmeasurementbyfurtherevolutionarytransactionthroughrefreshingsequentialpulsetimeofarrival(TOA)measurementmatrixformatchingandcorrelating.SimulationresultsshowthattheaccuracyofTDOAmeasurementhassignificantsuperiorityoverTOA,anddetectionprobabilityoffalseTDOAmeasurementintroducedbynoiseandfakemeasurementcanbereducedeffectively.

简介：摘要NET平台提供了全面、完整的数据库访问组件，ADO.NET就是在ADO的基础上发展而来，全面支持以面向对象的形式来访问和管理数据库系统，文中主要以信息管理系统研发为例，探讨了.NET开发平台下的数据库技术以及ADO.NET技术访问和存取数据库的模式。ADO.NET组件实现了一种全新的数据库访问、存取机制。

简介：Timesynchronizationtechniques,especiallyonthepulsepersecond(PPS)temporalbasis,haveattractedgrowingresearchinterestsinrecentyears.Inthispaper,wehaveproposedandexperimentallydemonstratedahigh-precisiontwo-waytimetransfer(TWTT)systemtorealizelong-distancedisseminationof1PPSsignalgeneratedbyahydrogenmaser.Adense-wavelength-division-multiplexing(DWDM)systemandbi-directionalerbium-dopedfiberamplifiers(Bi-EDFAs)havealsobeenadoptedtosuppresstheimpactofRayleighbackscatteringandoptimizethesignaltonoiseratio(SNR)aswell.Wehavetheoreticallyanalyzedthesystematicdelayindetail.Theultimaterootmeansquare(RMS)variationoftimesynchronizationaccuracyissub-26psandthetimedeviationcanbereducedtoaslowas1.2psat100sand0.253psat12000s,respectively.

简介：CognitiveRadio(CR)systembasedonOrthogonalFrequencyDivisionMultipleAccess(OFDMA),suchasWirelessRegionalAreaNetworks(WRAN)andWorldwideInteroperabilityforMicrowaveAccess(WiMAX),oftenattempttoimproveperformanceviadynamicradioresourcemanagement,whichischaracterizedasconcurrentprocessingofdifferenttrafficandnondeterministicsystemcapacity.Itisessentialtodesignandevaluatesuchcomplexsystemusingpropermodelingandanalysistools.Inthepreviouswork,mostofthecommunicationsystemsweremodeledasMarkovChain(MC)andStochasticPetriNets(SPN),whichhavetheexplicitlimitationinevaluatingadaptiveOFDMACRsystemwithwideareatraffic.Inthispaper,wedevelopanexecutabletop-downhier-archicalColoredPetriNet(CPN)modelforadaptiveOFDMACRsystem,andanalyzeitsperformanceusingCPNtools.TheresultsdemonstratethattheCPNcanmodeldifferentradioresourcemanage-mentalgorithmsinCRSystems,andtheCPNtoolsrequirelesscomputationaleffortthanMarkovmodelusingMatlab,withitsflexibilityandadaptabilitytothetrafficswhicharrivalintervalandprocessingtimearenotexponentiallydistributed.

简介：Underthecomplicatedelectromagnetismcircumstance,themodelofdatafusioncontrolandguidanceofsurface-to-airmissileweaponsystemsisestablished.SuchwaysandtheoriesasElman-NN,radartrackingandfilter’sdatafusionnetbasedonthegroupmethodfordata-processing(GMRDF)areappliedtoconstructingthemodelofdatafusion.Thehighlyreliablestateestimationofthetrackingtargetsandtheimprovementinaccuracyofcontrolandguidanceareobtained.Thepurposeisoptimizationdesignofdatafusioncontrolandguidanceofsurface-to-airmissileweaponsystemsandimprovingthefightingeffectivenessofsurface-to-airmissileweaponsystems.

简介：Classicalnetworkreliabilityproblemsassumebothnetworksandcomponentshaveonlybinarystates,fullyworkingorfullyfailedstates.Butmanyactualnetworksaremulti-state,suchascommunicationnetworksandtransportationnetworks.Thenodesandarcsinthenetworksmaybeinintermediatestateswhicharenotfullyworkingeitherfullyfailed.Asimulationapproachforcomputingthetwo-terminalreliabilityofamulti-statenetworkisdescribed.Two-terminalreliabilityisdefinedastheprobabilitythatdunitsofdemandcanbesuppliedfromthesourcetosinknodesunderthetimethresholdT.Thecapacitiesofarcsmaybeinastochasticstatefollowinganydiscreteorcontinuousdistribution.Thetransmissiontimeofeacharcisalsonotafixednumberbutstochasticaccordingtoitscurrentcapacityanddemand.Tosolvethisproblem,acapacitatedstochasticcolouredPetrinetisproposedformodellingthesystembehaviour.Placesandtransitionsrespectivelystandforthenodesandarcsofanetwork.Capacitatedtransitionandself-modifiedtokencolourwithrouteinformationaredefinedtodescribethemulti-statenetwork.Bythesimulation,thetwo-terminalreliabilityandnodeimportancecanbeestimatedandtheoptimalroutewhosereliabilityishighestcanalsobegiven.Finally,twoexamplesofdifferentkindsofmultistatenetworksaregiven.