简介：Thecoherenceisameasurefortheaccuracyoftheinterferometricphase,andthesyntheticapertureradar(SAR)interferometriccoherenceisaffectedbyseveralsourcesofthedecorrelationnoise.ForthecircularSAR(CSAR)imaginggeometry,thesystemresponsefunctionisintheformoftheBesselfunctionwhichbringsahighsidelobe,andthehighsidelobeofCSARwillbeanimportantfactorinfluencingtheinterferometriccoherence.Theeffectofthehighsidelobeonthecoherenceisanalyzedanddeduced.BasedontheinterferometriccharacteristicsoftheslightdifferenceintheviewinganglesandthepotentialpixeloffsetintheinterferometricSAR(InSAR)images,arelationbetweentheradarimpulseresponseandthecoherencelossfunctionisderived.Fromtherelationalmodel,thecoherencelossfunctionduetothehighsidelobeofCSARisthendeduced,andcomparedwiththatoftheconventionalSAR.ItisshownthatthehighsidelobeofCSARfocusingsignalwillseverelyaffectthebaselinedecorrelationandcoregistrationdecorrelation.SimulationresultsconfirmthetheoreticalanalysisandquantitativelyshowthebaselineandcoregistrationdecorrelationdegradationduetothehighsidelobesofCSAR.

简介：Thecharacteristicsoflow-frequencyelectricalnoise,voltage-current(V-I)andelectricalderivationfor980nmInGaAsP/InGaAs/GaAshighpowerdoublequantumwelllasers(DQWLs)aremeasuredunderdifferentconditions.Thecorrelationofthelow-frequencyelectricalnoisewithsurfacenon-radiativecurrentofdevicesisdiscussed.Theresultsindicatethelow-frequencyelectricalnoiseof980nmDQWLswithhighpowerismainly1/fnoiseandhasgoodrelationwiththedevicesurfacecurrentatlowinjection.

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简介：ThePNjunctionphotodiodeisfabricatedwithhighresistivityP-typesilicon(ρ＝12000Ω·cm).TheexperimentalC-Vcurveswithandwithoutlaserradiationweremeasured.Therelativechangeofcapacitancecanbegreaterthan100%,whichismuchgreaterthantherelativechangeforlowresistivityP-typesilicon.Therelativechageofcaacitancewithandwithoutlaserradiationatzerobiasis121.7%.

简介：Thispaperstudiesthelinkageproblembetweentheresultofhigh-levelsynthesisandback-endtechnology,presentsamethodofhigh-leveltechnologymappingbasedonknowledge,andstudiesdeeplyallofitsimportantlinkssuchasknowledgerepresentation,knowledgeutilityandknowledgeacquisition.Itincludes:(1)presentakindofexpandedproductionaboutknowledgeofcircuitstructure;(2)presentaVHDL-basedmethodtoacquireknowledgeoftechnologymapping;(3)providesolutioncontrolstrategyandalgorithmofknowledgeutility;(4)presentahalf-automaticmaintenancemethod,whichcanfindredundanceandcontradictionofknowledgebase;(5)presentapracticalmethodtoembedthealgorithmintoknowledgesystemtodecreasecomplexityofknowledgebase.Asystemhasbeendevelopedandlinkedwiththreekindsoftechnologies,soverifiedtheworkofthispaper.

简介：栅栏的衍射效率支离破碎的纤维激光横梁联合尽最大努力起一个重要作用。通过理论上的分析和数字模拟，衍射效率将与栅栏频率和波长带宽的减少增加，这被证明了。在一个纤维数组的宽度在W=10厘米被修理的条件上，最佳栅栏频率数字地作为f=230公里被模仿?1。另外，一个不相等的间隔方法被建议改进衍射的系统效率进0.4293，它在相等的间隔条件下面比0.3824高。CLC数字TN253由中国(60678018)的国家自然科学基础支持了

简介：Movingobjectextractionandclassificationareimportantproblemsinautomatedvideosurveillancesystems.Abackgroundmodelbasedonregionsegmentationisproposed.AnadaptivesingleGaussianbackgroundmodelisusedinthestableregionwithgradualchanges,andanonparametricmodelisusedinthevariableregionwithjumpingchanges.Ageneralizedagglomerativeschemeisusedtomergethepixelsinthevariableregionandfillinthesmallinterspaces.Atwo-thresholdsequentialalgorithmicschemeisusedtogroupthebackgroundsamplesofthevariableregionintodistinctGaussiandistributionstoacceleratethekerneldensitycomputationspeedofthenonparametricmodel.Inthefeature-basedobjectclassificationphase,thesurveillancesceneisfirstpartitionedaccordingtotheroadboundariesofdifferenttrafficdirectionsandthenre-segmentedaccordingtotheirscenelocalities.Themethodimprovesthediscriminabilityofthefeaturesineachpartition.AdaBoostmethodisappliedtoevaluatetherelativeimportanceofthefeaturesineachpartitionrespectivelyanddistinguishwhetheranobjectisavehicle,asinglehuman,ahumangroup,orabike.Experimentalresultsshowthattheproposedmethodachieveshigherperformanceincomparisonwiththeexistingmethod.

简介：Themeasurementtheoremoffiberopticallydriveninstrumentforhigh-voltagelinecurrentispresented.ThePLLvoltage-frequency-narrowpulseprincipleanditsmicro-consumptionmechanismareproposed,followedbyanalysisonthetwomainfactorsaffectingPLLmeasurementprecision.Asoftwaredesignschemeusing80C196KBmicro-controllerisintroduced.Theexperimentresultissatisfactory.

简介：一个高速度的X光检查非破坏性的察觉者在这份报纸被设计。X光检查非破坏性的察觉的原则被分析，并且高速度的X光检查非破坏性的察觉者的一个一般系统计划被建议。Virtex-4系列Fx12FPGA芯片被用来设计它的硬件电路，PowerPC405嵌入系统被开发，处理算法的高速度的图象被使用编译它的处理软件，并且TCP/IP协议被采用编译通讯软件，认识到高速度的X光检查信号聚会，处理并且传播。试验性的结果显示察觉者能在关联词工业地里与钢电线绳被用于生产线的长途、联机的非破坏性的察觉，例如矿，港口和码头。当察觉者的调查宽度是1.6m时，conveyer带的跑的率能完成6m/s。

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

简介：高温度液体被注入微尺寸毛状并且它的轻繁殖行为被调查。我们集中于抽方法的二不同液体。第一个方法能把高温度液体听输入微尺寸由使用一个高压力差别系统毛状。在抽以后，与光搬运人一起连接的单个模式纤维(SMF)基于微波interferometry(OCMI)系统被用来测量不同液体听层次在微尺寸毛状。第二个方法能把房间温度引擎油输入由使用注射泵毛状。当液体被输入时，这个方法能避免空气水泡毛状。

简介：三角洲西格马变换器是高速度和分辨率analog-to-digital调节的人之一。它的实现需要低oversampling技术和多小点承兑交单变换器。多小点承兑交单变换器导致的噪音成为败坏的关键因素之一三角洲西格马A/D变换器的signal-to-noise率。有信号统一transfunction的新奇结构，匹配的动态元素(DEM)并且塑造噪音被讨论。方法被调查基于建议结构设计变换器。行为模拟显示结构和设计方法是可行的。

简介：Nystrommethodisanewmethodforsolvingelectromagneticscatteringproblems.Thispapergivesthedetaileddescriptiononhigh-orderNystrommethodusedfortheelectricfieldintegralequationofelectromagneticscatteringproblems.ThenumericalsolutionsoftwoexamplesarecorrectcomparedwithMethodOfMoment(MOM).

简介：ThispapergivesaMUSICsignalDOAestimationalgorithmbasedonthemodifiedhigh-ordercumulantmatrixwhichisconstructedbytherecieveddataandtheirconjugaterearrangements.Whenthesnapshotnumberislimited,thisalgorithmcanimprovethesignalDOAestimationperformancesobviously,anditscomputationalcomplexityscarcelyincreases.Finally,somesimulationresultstoverifythetheoreticalanalysesarepresented.

简介：啁啾的纤维布拉格栅栏在光通讯和读出系统发现了许多应用。高质量与2的思考带宽基于啁啾的纤维布拉格栅栏过滤。6和32nm和高反射率与长阶段分别地掩盖的第2a4厘米试验性地被表明。与扁平的思考乐队和高反射率一起的这些过滤器被给类型ⅡA写啁啾的布拉格栅栏完成。

简介：Inthemodernanaloguedesign,TransistorLevelFaultSimulation(TLFS)playstheim-portantpartsinceeveryfaultinthewholecircuithastobesimulatedatthatlevel.Unfortunately,itisaveryCPUintensivetaskeventhoughitmaintainsthehighaccuracy.Therefore,HighLevelFaultModeling(HLFM)andHighLevelFaultSimulation(HLFS)arerequiredinordertoalleviatetheeffortsofsimulation.Inthispaper,differentHLFMapproachesarereviewedatthedevicelevelduringlasttwodecades.Weclarifytheirdomainsofapplicationandevaluatetheirstrengthsandcurrentlimitations.Wealsoanalyzecausesoffaultsandintroducevarioustestapproaches.

简介：这份报纸建议调节叉回转仪(M-TFG)到decouple的micromachined的一个改进图案在更好并且到增加分辨率驾驶并且察觉到指示之间的生气谈话。由采用双褶层的春天暂停，开车模式和感觉模式是机械地decoupled。通过双褶层的春天暂停和开车梳子的地点的小心的布局设计，机械联合效果被从察觉孤立讨厌的刺激进一步减少。优秀因素调查证明那个高质量的因素能被使用这结构达到，它能引进精确分辨率。作为结果，这个图案有潜力为起始的水平应用程序完成低偏爱飘移和精确分辨率。

简介：Thepaperpresentsanewarchitecturecomposedofbitplane-parallelcoderforEmbeddedBlockCodingwithOptimizedTruncation(EBCOT)entropyencoderusedinJPEG2000.Inthearchitecture,thecodinginformationofeachbitplanecanbeobtainedsimultaneouslyandprocessedparallel.Comparedwithotherarchitectures,ithasadvantagesofhighparallelism,andnowasteclockcyclesforasinglepoint.Theexperimentalresultsshowthatitreducestheprocessingtimeabout86%thanthatofbitplanesequentialscheme.AFieldProgrammableGateArray(FPGA)prototypechipisdesignedandsimulationresultsshowthatitcanprocess512×512gray-scaledimageswithmorethan30framespersecondat52MHz.

简介：Anoveluniversalpreprocessingmethodisproposedtoestimateanglesofarrival,whichisapplicabletoone-ortwo-dimensionalhighresolutionprocessingbasedonarbitrarycenter-symmetricarrays(suchasuniformlineararrays,equal-spacedrectangularplanararraysandsymmetriccirculararrays).Bymappingthecomplexsignalspaceintotherealone,thenewmethodcaneffectivelyreducethecomputationneededbythesignalsubspacedirectionfindingtechniqueswithoutanyperformancedegradation.Inaddition,thenewpreprocessingschemeitselfcandecorrelatethecoherentsignalsreceivedonthearray.Forregulararraygeometrysuchasuniformlineararraysandequal-spacedrectangularplanararrays,thepopularspatialsmoothingpreprocessingtechniquecanbecombinedwiththenovelapproachtoimprovethedecorrelatingability.Simulationresultsconfirmtheaboveconclusions.

简介：ThepaperaddressestheproblemoftargetrecognitionusingHigh-resolutionRadarRangeProfiles(HRRP).Anovelapproachoffeatureextractionanddimensionreductionbasedonextendedhighordercentralmomentsisproposedinordertoreducethedimensionofrangeprofiles.FeaturesextractedfromradarHRRPsarenormalizedandsmoothed,andthencomparativeanalysisofthesimilarapproachesisdone.Therangeprofilesareobtainedbystepfrequencytechniqueusingthetwo-dimensionalbackscattersdistributiondataoffourdifferentaircraftmodels.Thetemplatematchingmethodbynearestneighborrules,whichisbasedonthetheoryofkernelmethodsforpatternanalysis,isusedtoclassifyandidentifytherangeprofilesfromfourdifferentaircrafts.Numericalsimulationresultsshowthattheproposedapproachcanachievegoodperformanceofstability,shiftindependenceandhigherrecognitionrate.Itishelpfulforreal-timeidentificationandtheengineeringimplementsofautomatictargetrecognitionusingHRRP.Thenumberofrequiredtemplatescouldbereducedcon-siderablywhilemaintaininganequivalentrecognitionrate.