简介:Therandomstepmaneuverwithuniformlydistributedstartingtimeshasthedisadvantagethatitcannotfocusthestartingtimeonthemoreefficiencytime.Itdecreasesthepenetrationprobability.Toresolvethisproblem,arandomsteppenetrationalgorithmwithnormaldistributionstartingtimeisproposed.Usingtheshapingfiltersandadjointsystemmethod,themissdistancewithdifferentstartingtimescanbeacquired.Accordingtothepenetrationstandard,thetimewindowensuringsuccessfulpenetrationcanbecalculatedanditisusedasthe3σboundofthenormallydistributedrandommaneuver.Simulationresultsindicatethatthenormallydistributedrandommaneuverhashigherpenetrationprobabilitythantheuniformlydistributedrandommaneuver.
简介:ProbabilisticAnalysisandMulticriteriaDecisionforMachineAssignmentProblemwithGeneralServiceTimesWangJing(Inst.ofSys.Eng.,Dalia...
简介:Comparedwithaccuratediagnosis,thesystem’sselfdiagnosingcapabilitycanbegreatlyincreasedthroughthet/kdiagnosisstrategyatmostkvertexestobemistakenlyidentifiedasfaultyunderthecomparisonmodel,wherekistypicallyasmallnumber.BasedonthePreparata,Metze,andChien(PMC)model,then-dimensionalhypercubenetworkisprovedtobet/kdiagnosable.Inthispaper,basedontheMaengandMalek(MM)?model,anovelt/k-faultdiagnosis(1k4)algorithmofndimensionalhypercube,calledt/k-MM?-DIAG,isproposedtoisolateallfaultyprocessorswithinthesetofnodes,amongwhichthenumberoffault-freenodesidentifiedwronglyasfaultyisatmostk.ThetimecomplexityinouralgorithmisonlyO(2nn2).
简介:<正>VishayIntertechnology公司日前宣布推出采用小型PowerPAK1212—8封装的业界首款200V功率MOSFET器件。该器件封装的面积为3.3mm×3.3mm,高度仅为1.07mm,其在提供极为卓越的热性能的同时提供了比SO—8解决方案更小的尺寸。PowerPAK1212—8封装的功率消耗为3.8W,几乎是任何具有TSSOP—8封装尺寸或更小尺寸的MOSFET器件的两倍。该封装典型的热阻仅为1.9℃/W,而SO—8的为16℃/w。除空间节约及其高电压性能外,Si7820DN还具备240mΩ的导通电阻和12.1nC的栅极电荷。新型功率MOSFET的工作结温和存放温度范围规定为—55℃~+150℃。
简介:基于AlGaN/GaNHEMT工艺制作了大栅宽GaN高电子迁移率晶体管(HEMT)管芯,通过负载牵引及建模技术提取了管芯的输入阻抗、输出阻抗。设计中首先通过L-C网络提升了管芯的输入阻抗、输出阻抗,并通过微带多节阻抗变换器实现了宽带功率分配器及合成器电路的制作,同时还加入了稳定网络,最终实现了50Ω输入输出阻抗匹配。该大功率GaNHEMT内匹配器件采用四胞管芯功率合成技术,总栅宽为4×16mm。在50V漏电压、1ms周期、10%占空比的测试条件下及5.3~5.9GHz频率范围内,输出功率均高于56dBm,最高达到56.5dBm,功率增益均大于12dB,带内功率附加效率超过48.2%。
简介:高压水射流作为一种新型、高效、清洁的能量,与机械刀具联合作用清洗油管具有优势。根据不同使用条件和适用对象,对水射流参数进行调整,对钻头切削齿和喷嘴布置进行合理的设计。首创了一种高压水射流处理水泥堵塞油管新技术,设计制造了清洗堵塞油管专用设备和工具,现场实验取得了
简介:Anovelapproachtogenerate60GHzopticalcarriersuppression(OCS)millimeter-wave(mm-wave)signalbasedonthesaturatedopticalparametricamplification(OPA)effectinhighnon-linearfiber(HNLF)isinvestigated.Intheproposedsystem,theOPAeffectoccurswhenthesignalandpumpwith30GHzfrequencyintervalaresetintothehighnon-linearfiber.BycontrollingthelengthofHNLF,OPAeffectsaturates,andthepumppowerisdeliveredinalargeextenttothesignalandidlerlight,soa60GHzOCSmm-waveisgenerated.Thesystemdoesnotneedhigh-speedexternalmodulator,high-frequencyvibrationsourceornarrow-bandfilter,whichgreatlyreducesthecostandimprovesthestabilityoftheradiooverfiber(ROF)system.Resultsshowthatthe10Gb/sdownstreamsignalcanbetransmittedwithnegligiblepowerpenalty.