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13 个结果
  • 简介:SiliconPhotodiodewithVerySmalSensitiveArea①YINChangsong,LIXiaojun(WuhanUniversity,Wuhan430072,CHN)Abstract:ThesiliconPNjuncti...

  • 标签: PHOTODIODE PHOTOELECTRIC CONVERSION PN JUNCTION
  • 简介:ThetransmissiondelayofphotogeneratedcarriersinaCMOS-process-compatibledoublephotodiode(DPD)isanalyzedbyusingdevicesimulation.TheDPDsmallsignalequivalentcircuitmodelwhichincludestransmissiondelayofphotogeneratedcarriersisgiven.Fromanalysisonthefrequencydomainofthecircuitmodelthedevicehastwopoles.OnehastherelationshipwithjunctioncapacitanceandtheDPD'sload,theotherwiththedepthandthedopingconcentrationoftheN-wellintheDPD.DifferentdepthoftheNwellanddifferentareaoftheDPDswithbandwidthwerecompared.TheanalysisresultsareimportanttodesignthehighspeedDPDs.

  • 标签: 双光电二极管 小信号电路模拟 光电检测器 器件模拟
  • 简介:Abundanttestdataarerequiredinassessmentofweaponperformance.Whenweapontestdataareinsufficient,Bayesiananalysesinsmallsamplecircumstanceshouldbeconsideredandthetestdatashouldbeprovidedbysimulations.TheseveralBayesianapproachesarediscussedandsomelimitationsarefounded.AnimprovementisputforwardafterlimitationsofBayesianapproachesavailableareanalyzedandtheimprovedapproachisappliedtoassessmentofsomenewweaponperformance.

  • 标签: 贝叶斯估计 小样本理论 武器 置信度
  • 简介:Thealgorithmofautonomousorbitdeterminationfortheprobearoundsmallbodyisstudied.Inthealgorithm,first,theobservedimagesofthebodyarecomparedwithitspre-computedmodelofthebodytoobtainthelocationofthelimbfeaturesofthebodyintheinertialcoordinate.Second,theinformationoftheimagesandfeaturesinutilizedtoobtainthepositionoftheprobeusingtheLevenberg-Marquardtalgorithm.ThepositionistheninputtoanextendedKalmanfilterwhichdeterminestherealtimeorbitoftheprobe.Finally,consideringtheeffectiveoftheirregularsmallbodyshapeperturbationandthesmallbodymodelparametererrorontheorbitdeterminationprecise,theprocedureofautonomousorbitdeterminationisvalidatedusingdigitalsimulation.

  • 标签: 自主轨道确定 小物体探测 LEVENBERG-MARQUARDT算法 扩展卡尔曼滤波
  • 简介:一有效器官光电(OPV)有indium-tin-oxide/CuPc/C60/Ag结构的房间被改变器官的层的电影厚度调查了。高开电路的电压(V0.5V的OC),电线走火电流密度(J5.81mA/cm2的SC),和高度驱动变换效率(η1.2%的p)在最佳电影厚度被完成。结果证明材料厚度是到房间优化的一个重要因素,特别为最大化象减少房间电阻一样的吸收率。当堵住10nm的层的BCP激子被介绍,试验性的结果也显示力量变换效率从1.2%~1.54%增加。

  • 标签: 油膜厚度 分子太阳能电池 有机层 OPV电池
  • 简介:Treetopologies,whichconstructspatialgraphswithlargecharacteristicpathlengthsandsmallclusteringcoefficients,areubiquitousindeploymentsofwirelesssensornetworks.Smallworldsareinvestigatedintree-basednetworks.Duetolinkadditions,characteristicpathlengthsreducerapidlyandclusteringcoefficientsincreasegreatly.Atreeabstract,Cayleytree,isconsideredforthestudyofthenavigationalgorithm,whichrunsautomaticallyinthesmallworldsoftree-basednetworks.Inthefurtherstudy,epidemicsinthesmallworldsoftree-basedwirelesssen-sornetworksonthelargescalearestudied,andthepercolationthresholdiscalculated,atwhichtheoutbreakoftheepidemictakesplace.ComparedwithCayleytree,thereisasmallerpercolationthresholdsufferingfromtheepidemic.

  • 标签: 无线传感器网络 拓扑结构 小世界 CAYLEY树 聚类系数 路径长度
  • 简介:Thispaperpresentsahandheld3Dvision-basedscannerforsmallobjectsbyusingKinect.Itisdifferentfromthepreviouscolor-glove-basedapproacheswhichrequiresegmentingthetargetobject.First,weeliminatethenoisesandtheoutlierscausedbyholdinghands.Second,weapplyKinect-fusionalgorithmandtruncatedsigneddistancefunction(TSDF)torepresent3Dsurfaces.Third,weproposeamodifiedintegrationstrategytoeliminatethehandeffect.Fourth,wetakeadvantageoftheparallelcomputationofGPUsforreal-timeoperation.Themajorcontributionsofthispaperare(1)theregistrationprecisionisimproved,(2)theofflineamendmentandloopclosureoperationarenotrequired,and(3)concave3Dobjectreconstructionisfeasible.IndexTermsHandheld3Dscanning,Kinect-fusion,Truncatedsigneddistancefunction(TSDF).1.IntroductionRecently,thesensor-based3Dmodelreconstructionmethodshavebeenproposed[1].Thesensordeviceshavedifferentpropertiessothatthe3Dreconstructionalgorithmsvaryaccordingly.Thecommonlyusedsensordevicesaretime-of-flight(ToF)cameras[2]-[4],laserscanners[5],andstructuredlightscanners[6],[7].Lasershavegainedareputationforaccuracy;however,caremustbetakentouseeye-safelaserswhenoperatinginproximitytohumans.Foraninteractivesystem,thestructuredlightscannerwhichisbasicallyapassivevision-basedsensordeviceissuperiorbecauseitprovidesa2DdepthimageperframeandismoreaccuratethanthatofaToFcamera.Here,wepresentareal-time3DscannerusingthedepthimagescapturedbyKinect.

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  • 简介:二个小尺寸的包裹方法,基于的包裹方法和plating黄金基于的薄不锈钢试管为纤维布拉格包装方法栅栏(FBG)温度传感器,被设计。在环境温度between203K和243K的FBG温度传感器的特征被调查。温度的功能试验性地被检验的FBG温度传感器的波长。处于相同条件的二个不同small-sizepackage传感器的实验结果与对方相比。传感器的传播光谱在273K和213K的温度被分析。温度传感器的敏感因素是导出的经分解并且被实验验证。到thewavelength温度曲线的线性适合被执行。

  • 标签: 不锈钢管 BRAGG光栅 FBG 低温 温度传感器
  • 简介:Highfrequencysurfacewaveradar(HFSWR)iswellprovedtohaveoverthehorizon(OTH)detectioncapabilitytoweakaerialtargets,suchasconcealedairplanesorcruisemissiles.ThemostimportantproblemofdetectionoffastandsmalltargetsusingHFSWRisearlierwarning,i.e.enlargementofdetectionrangeoftargets.Therefore,thedetectionthresholdshouldbedecreasedaslowaspossible,butnumerousfalsealarmsarebroughtaboutatthesametime.Onthiscondition,conventionaltrackinitiationtechniques,whichnormallyrequiretheprobabilityoffalsealarmtobeatthelevelof10-6,willinitiateenormousfalsetracksandleadtoabnormaloperationoftrackingsystem.Anadaptivemodifiedhoughtransform(AMHT)trackinitiatorisproposedaccordinglyandtherelationofdetectionrangetotheperformanceoftrackinitiatorisanalyzedinthispaper.SimulationsareperformedtoconfirmthecapabilityoftrackinitiationtofastandsmalltargetsindenseclutterbyAMHTtrackinitiator.Thetolerableprobabilityoffalsealarmofdetectorcanreachthelevelof10-3.Anditperformsbetterthantrackinitiatorbasedonmodifiedhoughtransform(MHT).

  • 标签: 高频表面波雷达 霍夫变换 快速目标 小目标 HFSWR
  • 简介:Aconstructionmethodbasedonthep-planetodesignhigh-girthquasi-cycliclow-densityparity-check(QC-LDPC)codesisproposed.Firstlythegoodpointsineverylineofthep-planecanbeascertainedthroughfilteringthebadpoints,becausethedesignedparity-checkmatrixesusingthesepointshavetheshortcyclesinTannergraphofcodes.Thenoneofthebestpointsfromtheresidualgoodpointsofeverylineinthep-planewillbefound,respectively.Theoptimalpointisalsosingledoutaccordingtothebiterrorrate(BER)performanceoftheQC-LDPCcodesatlast.ExplicitnecessaryandsufficientconditionsfortheQC-LDPCcodestohavenoshortcyclesarepresentedwhichareinfavorofremovingthebadpointsinthep-plane.Sincepreventingtheshortcyclesalsopreventsthesmallstoppingsets,theproposedconstructionmethodalsoleadstoQC-LDPCcodeswithahigherstoppingdistance.

  • 标签: LDPC码 平面设计 QC 周长 低密度奇偶校验 短周期
  • 简介:分泌物参数通过小移动手持金属杆从控告的人的身体在静电的分泌物(ESD)被测量并且计算。关联学习与费用电压以及途径速度在分泌物参数上被执行了。在费用电压800V,分泌物参数的差别由电极的快、慢的途径速度引起了被发现到达极端价值。为这种特殊情况探索原因,与一个短差距的ESD模型一起的分析被执行。

  • 标签: 静电放电 相互关系 充电电压 参数
  • 简介:Thetracking,telemetryandcommand(TT&C)missionisextremelyreliableforitscharactersofsmalltimehorizonandhighredundancy.Thecombinedforcingandfailurebiasing(CFFB)methodthatisusuallyusedforsimulatingtheunreliabilityofthehighlydependablemissionsystemseemsnotsoefficientfortheTT&Cmission.TheconceptabouttheimportanceoffailuretransitionisproposedbasedonthelogicalrelationshipbetweenTT&Cmissionanditsinvolvedresources.Then,theimportanceisusedforreadjustingthetransitionrateofthefailuretransitionwhenusingtheforcingandfailurebiasingduringthesimulation.ExamplesshowthattheimprovedCFFBmethodcanevidentlyincreasetheoccurrenceoftheTT&Cmissionfailureeventanddecreasethesamplevariance.MoreredundancyoftheTT&CmissionleadstotheimprovedCFFBmethodmoreefficient.

  • 标签: 模拟方法 可靠性 计算机 任务系统 逻辑关系 转换速率
  • 简介:Givenanon-equidistantsequenceoranequidistantserieswithoneormoreoutliers,agreyinterpolationapproachconsideringthetimelagsisestablishedforproducingthemissingdataorcorrectingtheabnormalvalues.Toaccomplishthis,anewgreyincidencemodel,calledthegreydynamicincidencemodelGDIM(t),isconstructedfordeterminingwhetherthefactorsareeffectivetotheknownfactorandwhatthetimelagisbetweenausefulfactorandthespecifiedsequence.BasedontheresultsoftheGDIM(t)model,twoprogrammingproblemsaredesignedtoobtaintheupperandlowerboundsoftheunknownorabnormalvalueswhichareregardedasgreynumbers.Thesolutionsbasedontheparticleswarmoptimization(PSO)forthenonlinearprogrammingproblemsaregiven.Toexplainhowitcanbeusedinpractice,thisnewgreyinterpolationapproachisappliedtocorrectanabnormalvalueinthesequenceofanagricultureenvironmentproblem.

  • 标签: GREY INTERPOLATION GREY RELATIONAL ANALYSIS time