学科分类
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17 个结果
  • 简介:WehavemeasuredthedeepenergyleveloftheInP:Fewhichissemi-insulatorthroughthemethodofOTCS.TheeffectoflightintensityonOTCSmeasurementismainlydiscussed.ThereareelectrontrapofET=0.034eVandholetrapofET=1.13eVinInP:Feunderthestronglightandlowtemperature.ThelocationoftheOTCSpeakofelectrontrap(ET=0.34eV)movestowardsthedirectionofhightemperaturer,whenthelightintensitywasincreased,ETisdifferentunderdifferentlightintensity.Itiscorrectedintermsoftheorythatthestuffratioofthedeepenergylevelisaffectedbythelightintensity.Theexperimentsshowthattheerrorisdecreasedgreatlywiththecorrection.

  • 标签: 杂质能级 测量 光瞬态电流光谱 半导体材料 磷化铟
  • 简介:Inthispaper,wepresentanewdeformablemodelforshapesegmentation,whichmakestwomodificationstotheoriginallevelsetimplementationofdeformablemodels.Themodificationsaremotivatedbydifficultiesthatwehaveencounteredinapplyingdeformablemodelstosegmentationofmedicalimages.Thelevelsetalgorithmhassomeadvantagesovertheclassicalsnakedeformablemodels.However,itcoulddeveloplargegapsintheboundaryandholeswithintheobjects.Suchboundarygapsandholesofobjectscancauseinaccuratesegmentationthatrequiresmanualcorrection.Theproposedmethodinthispaperpossessesaninherentpropertytodetectgapsandholeswithintheobjectwithasingleinitialcontourandalsodoesnotrequirespecificinitialization.Thefirstmodificationistoreplacetheedgedetectorbysomeareaconstraint,andthesecondmodificationutilizesweightedlengthconstrainttoregularizethecurveunderevolution.Theproposedmethodhasbeenappliedtobothsyntheticandrealimageswithpromisingresults.

  • 标签: 医学图像分割 可变形模型 水平集算法 形状 边缘检测 约束规范
  • 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.

  • 标签: HIGH-LEVEL synthesis TECHNOLOGY MAPPING VHDL HIGH-LEVEL
  • 简介:线性系统的一个反复的答案被学习,它从天线由混合有限元素的方法和时刻的方法与绝缘的目标依附的一根电线的discretization产生(混合女性妈妈).It是有效的由混血儿为如此的电磁的问题建模女性妈妈,因为它两个都拿优点女性的并且妈妈的ability.But结果的线性系统是复杂的,并且它是难的被Krylovsubspace方法独自解决,一种二水平的preconditioning技术将因此是

  • 标签: 预处理技术 连接对象 介质天线 KRYLOV子空间方法 介质目标 电线
  • 简介:Aimingatthedefectsofthenodesinthelowenergyadaptiveclusteringhierarchy(LEACH)protocol,suchashighenergyconsumptionandunevenenergyconsumption,atwo-levellinearclusteringprotocolisbuilt.Theprotocolimprovesthewayofthenodesdistributionatrandom.Theterminalnodeswhichhavenotbeenatwo-levelclusterheadintheclustercancompetewiththeprincipleofequivalentpossibility,andonthebasisoftherestenergyofnodesthetwo-levelclusterheadisselectedatlast.Thesinglehopwithintheclusterandsinglehopormultiplehopsbetweenclustersareused.Simulationexperimentresultsshowthattheperformanceofthetwo-levellinearclusteringprotocolappliedtotheHexicorridoragriculturalfieldissuperiortothatoftheLEACHprotocolinthesurvivaltimeofnetworknodes,theratioofsuccess,andtheremainingenergyofnetworknodes.

  • 标签: Clustering ENERGY-EFFICIENT FARMLAND Hexi corridor low energy adaptive clustering hierarchy(LEACH) LINEAR
  • 简介:Inthemodernanaloguedesign,TransistorLevelFaultSimulation(TLFS)playstheim-portantpartsinceeveryfaultinthewholecircuithastobesimulatedatthatlevel.Unfortunately,itisaveryCPUintensivetaskeventhoughitmaintainsthehighaccuracy.Therefore,HighLevelFaultModeling(HLFM)andHighLevelFaultSimulation(HLFS)arerequiredinordertoalleviatetheeffortsofsimulation.Inthispaper,differentHLFMapproachesarereviewedatthedevicelevelduringlasttwodecades.Weclarifytheirdomainsofapplicationandevaluatetheirstrengthsandcurrentlimitations.Wealsoanalyzecausesoffaultsandintroducevarioustestapproaches.

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  • 简介:Theresidualelectricallyactivedefectsin(4×1012cm-2(30KeV)+5×1012cm-2(130KeV))si-implantedLECundopedsi-GaAsactivatedbytwo-steprapidthermalannealing(RTA)LABELEDAS970℃(9S)+750℃(12S)havebeeninvestigatedwithdeepleveltransientspec-troscopy(DLTS).TwoelectrontrapsET1(Ec-0.53eV,σn=2.3×10-16cm2)andET2(Ec-0.81eV,σn=9.7×10(-13)cm2)aredetected.Furthermore,thenoticeablevariationsoftrap’scon-centrationandenergylevelintheforbiddengapwiththedepthprofileofdefectsinducedbyionim-plantationandRTAprocesshavealsobeenobserved.The[Asi·VAs·AsGa]and[VAs·Asi·VGa·AsGa]areproposedtobethepossibleatomicconfigurationsofET1andET2,respectivelytoexplaintheirRTAbehaviors.

  • 标签: Si:GaAs Rapid thermal ANNEALING Ion IMPLANTATION
  • 简介:Throughexperimentsandcomputersimulation,theinfluenceoftheenergylevelsoforganicmaterialsandelectrodematerialsintheorganiclight-emittingdiodes(OLEDs)onthedeviceperformancesisdiscussed.Resultsshowthatthedeviceperformancesareinfluencedbynotonlythecarrierinjectionbarriersattheelectrodeinterfacebutalsothebarriersattheorganicheterojunctioninterface.ThisresultishelpfultotheselectionoftheorganicmaterialsandtheirarrangementintheoptimaldesignofOLEDs.

  • 标签: 发光二极管 能级匹配 发光效率 OLED
  • 简介:Doubledataratesynchronousdynamicrandomaccessmemory(DDR3)hasbecomeoneofthemostmainstreamapplicationsincurrentserverandcomputersystems.Inordertoquicklysetupasystem-levelsignalintegrity(SI)simulationflowfortheDDR3interface,twosystem-levelSIsimulationmethodologies,whichareboard-levelS-parameterextractioninthefrequency-domainandsystem-levelsimulationassumptionsinthetimedomain,areintroducedinthispaper.BycomparingtheflowofSpeed2000andPowerSI/Hspice,PowerSIischosenfortheprintedcircuitboard(PCB)board-levelS-parameterextraction,whileTektronixoscilloscope(TDS7404)isusedfortheDDR3waveformmeasurement.Thelabmeasurementshowsgoodagreementbetweensimulationandmeasurement.ThestudyshowsthatthecombinationofPowerSIandHspiceisrecommendedforquicksystem-levelDDR3SIsimulation.

  • 标签: 系统级仿真 计算机系统 信号完整性 动态随机存取记忆体 HSPICE 印刷电路板
  • 简介:晶片水平密封包裹方法与benzo-cyclo-butene(BCB)为optoelectronic在低温度试验性地被学习材料。结果证明结合的温度在250℃下面,两silicon-BCB-siliconandsilicon-BCB-glass的密封能力包装的氦比6X10~好(-4)Pa吗?cm~3/s。剪切强度为包裹是足够的。hermeticity在15个周期以后仍然好“热吃惊测试。在来自洞的漏率和到设备边阶的距离之间的Therelationship也与一个渗出物模型被讨论。

  • 标签: 低温压焊 密封管 BCB 渗流模型
  • 简介:Themicroscopicmechanismoflowlevellaserirradiation(LLLI)mendingrheologyforbloodisanalyzedbythequantumtheory.Theresultsshowthatthelasercanresolvethefibrinclot,sothepropertyofbloodrheologyisimproved,andsomebondsofthecholesterolinbloodarefracturedbythelowlevellaser(LLL).Hencetheratioofmembranecholesteroltomembranephosphatideoftheredcellisreduced,andthenthebloodcirculationcanbeimproved.Theclinicalcuredtestsandsomecorrelativetestdatacanbeexplainedbythetheoreticalanalysesinthispaper.

  • 标签: 血液流变学 低强度激光 激光照射 微观机理 量子理论 修复机理
  • 简介:Accordingtothedipoletransitionselectionrulesandbychoosingpropertransitionchannels,itisfoundthattheinvertedY-typefour-levelschemecanbeclassifiedintoninedifferent2nd-ordersubschemeswhenusingcorrespondinglaserfields,andtheycanbefurtherclassifiedintoeighty3rd-ordersubschemesindetailaccordingtodifferentexcitingintensitiesthatareappliedindifferentchannels.Inthispaper,thestructuremultiformityofinvertedY-typefour-levelschemeisdiscussedandthedemonstrationsonsomesubschemesarealsogiven.Atthesametime,thesubschemeswhichhavebeenstudiedarepointedout,butmostofthemhavenotbeenresearchedtothebestofourknowledge.

  • 标签: 四能级 多样性 光学相干 Y型 结构 系统
  • 简介:Withtheincreaseoftheclockfrequencyandsiliconintegration,powerawarecomputinghasbecomeacriticalconcerninthedesignoftheembeddedprocessorandsystem-on-chip(SoC).Dynamicvoltagescaling(DVS)isaneffectivemethodforlow-powerdesigns.However,traditionalDVSmethodshavetwodeficiencies.First,theyhaveaconservativesafetymarginwhichisnotnecessaryformostofthetime.Second,theyareexclusivelyconcernedwiththecriticalstageandignorethesignificantpotentialfreeslacktimeofthenoncriticalstage.Thesefactorsleadtoalargeamountofpowerwaste.Inthispaper,anovelpipelinestructurewithultra-lowpowerconsumptionisproposed.Itcutsoffthesafetymarginandtakesuseofthenoncriticalstagesatthesametime.Aprototypepipelineisdesignedin0.13mtechnologyandanalyzed.Theresultshowsthatalargeamountofenergycanbesavedbyusingthisstructure.Comparedwiththefixedvoltagecase,50%oftheenergycanbesaved,andwithrespecttothetraditionaladaptivevoltagescalingdesign,37.8%oftheenergycanbesaved.

  • 标签: 流水线结构 超低功耗 低功耗设计 动态电压调节 时序 电路
  • 简介:Classifyingthetextureofgranulesin2Dimageshasarousedmanifoldresearchatten-tionforitstechnicalchallengesinimageprocessingareas.ThisletterpresentsanaggregatetextureidentificationapproachbyjointlyusingGrayLevelCo-occurrenceProbability(GLCP)andBPneuralnetworktechniques.First,upto8GLCP-associatedtexturefeatureparametersaredefinedandcomputed,andtheseconsequentparametersnextserveastheinputsfeedingtotheBPneuralnetworktocalculatethesimilaritytoanyofgivenaggregatetexturetype.Afinitenumberofaggregateimagesof3kinds,witheachcontainingspecifictypeofmineralparticles,areputtotheidentificationtest,experimentallyprovingthefeasibilityandrobustnessoftheproposedmethod.

  • 标签: BP神经网络 纹理识别 二维图像 概率 共生 灰度
  • 简介:Thisletterstudiesandanalyzestheworkingfeaturesofmaincircuitoftri-levelboostPowerFactorCorrect(PFC)converterandtheadvantagesoftri-levelswitchconverterinaspectsofbearinghigh-voltageofpowercomponents,overallsystemlossandmagneticcomponentselectionbaseduponthesingle-levelboostPFCswitchconverter.Besides,relyingontheapplicationofmi-croprocessorinpowerconvertertechnologyandDSP(DigitalSignalProcessing)chip'sstrongcal-culatingcapacity,theletterpresentstheadoptionofmodifiedschemeoftri-levelboostPFCconverterunderthecontrolofpredictivecontrolalgorithm.Moreover,theoperatingprincipleandcontrolmethodarespecified,theresultsofcircuittestandanalysisareprovidedandtheadvantagesofpre-dictivecontroltechnology-basedmulti-levelboostPFCconverterisverified.

  • 标签: 通信技术 数字信号处理 预测控制 微处理器