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39 个结果
  • 简介:一个柔韧的适应控制计划基于backstepping设计与两个未知控制方向和非对称的死了地区的非线性在严格的反馈形式为不明确的非线性的系统的一个类被建议。死了地区的斜坡和边界相等、对称的条件被简化非线性的死了地区的输入模型,移开要知道的控制方向的priori知识被利用Nussbaum类型获得技术和神经网络(NN)消除的假设近似能力。可能的控制器奇特问题和死了地区的输入非线性的效果被把不可分的Lyapunov设计与滑动模式控制策略相结合完美地避免。在靠近环的系统的所有信号被保证到最终一致地半全球性被围住,系统的追踪的错误被证明被集成到起源的一位小邻居。模拟结果表明建议控制计划的有效性。

  • 标签: 不确定非线性系统 鲁棒自适应控制 执行器 死区非线性 Lyapunov 非线性系统控制
  • 简介:Inthispaper,theglobalasymptoticstabilizationbyoutputfeedbackisinvestigatedforaclassofuncertainnonlinearsystemswithunmeasuredstatesdependentgrowth.Comparedwiththecloselyrelatedworks,theremarkablenessofthepaperisthateitherthegrowthrateisanunknownconstantorthedimensionoftheclosed-loopsystemissignificantlyreduced,mainlyduetotheintroductionofadistinctdynamichigh-gainobserverbasedonanewupdatinglaw.Motivatedbytherelatedstabilizationresults,andbyskillfullyusingthemethodsofuniversalcontrolandbackstepping,weobtainthedesignschemetoanadaptiveoutput-feedbackstabilizingcontrollertoguaranteetheglobalasymptoticstabilityoftheresultingclosed-loopsystem.Additionally,anumericalexampleisconsideredtodemonstratetheeffectivenessoftheproposedmethod.

  • 标签: UNCERTAIN nonlinear systems GLOBAL ASYMPTOTIC stabilization
  • 简介:为协调宽带的评价在未知相关噪音领域里采购的到达(DOA)的方向的一个柔韧的算法被调查。噪音通常在在实际应用程序的传感器之中未知、相关,特别为有比较地小的孔的数组。空间地相关的噪音在在DOA评价集中错误和严重降级招致增加,并且因此,基于区分协变性矩阵集中转变的一个方法被建议消除噪音,因此减少集中的错误。模拟和试验性的结果表明建议方法的有效性。

  • 标签: 宽频 电源 噪声 声学
  • 简介:Anovelrotationalinvariancetechniqueforblindestimatesofdirectionofarrival(I)OA)andDopplerfrequencywithunknownarraymanifoldduetoarraysensoruncertaintiesisproposed,takingDopplerfrequencydifferencebetweenasuccessivepulsesasrotationalparameter.Theeffectivenessofthenewmethodisconfirmedbycomputersimulation.Comparedwiththeexisting2-DDOA-frequeucyestimatetechniques,thecomputationloadoftheproposedmethodcanbesavedgreatly.

  • 标签: DOA-Doppler frequency estimate HIGH-RESOLUTION array processing
  • 简介:Thispaperfocusesontheproblemofrobuststabiiizationforaclassoflinearsystemswithuncertainparametersandtimevaryingdelaysinstates.Theparameteruncertaintyiscontinuous,timevarying,andnorm-bounded.Thestatedelayisunknownandtimevarying.Thestatesofthesystemarenotallmeasurableandanobserverisconstructedtoestimatethestates.Ifalinearmatrixinequality(LMI)issolvable,thegainsofthecontrollerandobservercanbeobtainedfromthesolutionoftheLMI.Theobserverandcontrolleraredependentonthesizeoftimedelayandonthesizeofdelayderivative.Finally,anexampleisgiventoillustratetheeffectivenessoftheproposedcontrolmethod.

  • 标签: 线性矩阵不等式 时间延迟 稳定性 不定系统
  • 简介:基于观察员的适应滑动模式的问题与易于输入非线性的变化时间的延期三角洲控制操作符系统被调查。这非线性的斜坡参数是无节制的。一条新奇适应控制法律被建立以便在州评价的空间的滑动表面能在一有限时间被到达。A延期依赖者足够为错误系统和滑动模式动力学的asymptotic稳定性调节经由线性矩阵不平等(LMI)被导出。最后,一个模拟例子被举显示出建议方法的有效性和优点。

  • 标签: DELTA算子系统 自适应滑模控制 输入非线性 斜率 线性矩阵不等式 自适应控制律
  • 简介:Twoschemesforteleportinganunknownone-particlestateareproposedwhenageneralWstateisutilizedasquantumchannel.Inthefirstscheme,afterthesender(Alice)makesaBell-statemeasurementonherparticles,therecipient(Bob)performsaVonNeumannmeasurementandintroducesanauxiliaryparticle,andcarriesoutaunitarytransformationonhisparticleandtheauxiliaryparticle,andperformsaVonNeumannmeasurementontheauxiliaryparticletoconfirmwhethertheteleportationsucceedsornot.Inthesecondscheme,therecipient(Bob)doesnotneedtoperformthefirstVonNeumannmeasurementorintroducetheauxiliaryparticle,whichisnecessaryinthefirstscheme.Itisshownthatthemaximalprobabilitiesofsuccessfulteleportationofthetwoschemesareidenticaliftherecipient(Bob)performsanappropriateunitarytransformationandadoptsaproperparticleonwhichherecoversthequantuminformationofstatetobeteleported.

  • 标签: 未知单粒子态 概率隐形传态 三粒子纠缠 一般W态
  • 简介:Thispaperproposesaschemewhereonecanrealizequantumcloningofanunknowntwo-atomentangledstatewithassistanceofastatepreparerincavityQED.Thefirststageoftheschemerequiresusualteleportation.Inthesecondstageofthescheme,withtheassistanceofthepreparer,theperfectcopiesofanunknownatomicentangledstatecanbeproduced.

  • 标签: 量子克隆 偶原子核 空泡 QED
  • 简介:AbstractSince October 2021 in Alabama, the United States, and March 2022 in central Scotland, the United Kingdom, the number of cases of severe acute hepatitis of unknown etiology/causes in children was found to increase, and the total number of cases has reached 920 worldwide by June 22 this year, 45 cases (5%) required liver transplantation, and 18 cases (2%) died according to World Health Organization (WHO). To understand the basic characteristics of this disease/syndrome, a literature search was performed at PubMed, websites of WHO, UK Health Security Agency, and US and European Centers for Disease Control and Prevention, and more than 20 reports were enrolled as references for this review. The main clinical manifestations are anorexia, vomiting, fatigue, jaundice, and so forth. Most of the cases seemed to have a self-limited course of the disease, about 6% of cases may develop life-threatening acute liver failure. The disease seems to be transmissible from person to person. Human adenovirus was detected in up to 75% of cases, but this virus seems not to be the only and major etiologic agent, other cofactors probably are involved. Researchers proposed many hypotheses concerning the etiology and pathogenesis, and many important works and studies are ongoing. This mini-review is aimed at summarizing, reviewing, and further understanding the characteristics of the disease, raising some clinically relevant questions, and trying to discuss some questions that may be related to the treatment of the disease for consideration.

  • 标签: Acute liver failure Children Severe acute hepatitis of unknown causes
  • 简介:Arobustadaptiverepetitivelearningcontrolmethodisproposedforaclassoftime-varyingnonlinearsystems.Nussbaum-gainmethodisincorporatedintothecontroldesigntocounteractthelackofaprioriknowledgeofthecontroldirectionwhichdeterminesthemotiondirectionofthesystemunderanyinput.Itisshownthatthesystemstatecouldconvergetothedesiredtrajectoryasymptoticallyalongtheiterationaxisthroughrepetitivelearning.Simulationiscarriedouttoshowthevalidityoftheproposedcontrolmethod.

  • 标签: REPETITIVE learning CONTROL (RLC) UNKNOWN CONTROL
  • 简介:1三棘华枝SinophasmatrispinosumChenetChen,sp.nov.本新种与臀沟华枝SinophasmalatisectumChenetChen近似,但本种雄性臀节端部较窄,纵沟浅裂.背面具有3个排列成倒三角形的锥形突,第9节背板隆起成直角下垂等不同,可相区别.模式标本保存在中山大学.2单棘华枝SinophasmaunispinosumChenetChen,sp.nov.本新种与三棘华枝SinophasmatrispinosumChenetChen近似,但本种雄性臀节较狭长,两侧端叶扩展成瓣状;端部无纵沟,背面具有1个明显的锥形突,下生殖板形状以及第9节背板明显不同等,可相区别.模式标本保存在中山大学.3拟异尾华枝(雌性)SinophasmapseudomirabileChenetChen本种发表于1996年,当时仅报道其雄性,近在中山大学昆虫标本馆发现1对雌雄,其雌性与异尾华枝SionphasmamirabileGünther雌性相似.但本种头部形状,第7腹节腹板与腹瓣伸至的位置,以及尾须的形状等明显不同,可与之区别.模式标本保存在北京林业大学和中山大学.

  • 标签: 新种
  • 简介:Theproblemofadaptivefuzzycontrolforaclassoflarge-scale,time-delayedsystemswithunknownnonlineardead-zoneisdiscussedhere.Basedontheprincipleofvariablestructurecontrol,adesignschemeofadaptive,decentralized,variablestructurecontrolisproposed.Theapproachremovestheconditionsthatthedead-zoneslopesandboundariesareequalandsymmetric,respectively.Inaddition,itdoesnotrequirethattheassumptionsthatallparametersofthenonlineardead-zonemodelandthelumpeduncertaintyareknownconstants.Theadaptivecompensationtermsoftheapproximationerrorsareadoptedtominimizetheinfluenceofmodelingerrorsandparameterestimationerrors.Bytheoreticalanalysis,theclosed-loopcontrolsystemisprovedtobesemi-globallyuniformlyultimatelybounded,withtrackingerrorsconvergingtozero.Simulationresultsdemonstratetheeffectivenessoftheapproach.

  • 标签: 时滞系统 自适应变结构控制 离散控制 非线性死区
  • 简介:AbstractIntroduction:Numerous dermatoses associated with monoclonal gammopathy have been reported in the literature. Subepidermal autoimmune bullous diseases (SABD) are one of them which were not common.Here we report a case of SABD associated with MGUS who had a severe mucosal involvement and unexpected positive direct Nikolsky phenomenon.Case presentation:A 68-year-old male patient was admitted to our clinic with erosions on the oral mucosa, tense blisters, erosions, and ulcers on the trunk and extremities. Subepidermal vesicle formation was detected in the skin biopsy. Clinical examination revealed positivity for the Nikolsky phenomenon. The disease was unresponsive to conventional treatments and dysphagia and hoarseness occurred. The patient was screened for malignancy due to his unresponsiveness to the treatments and his severe oral mucosal involvement. Ig-G MGUS was detected in the patient.Discussion:The Nikolsky sign is an indicator of acantholysis and is known as a specific finding for pemphigus. However, when we look at gammopathy-associated autoimmune bullous dermatoses, skin fragility has been reported in cases. However, the meaning of fragility is not explained. The diagnosis of all these patients was Ig-M MGUS. Our patient was presented because of non-IgM MGUS, direct Nikolsky positivity, and severe mucosal involvement.Conclusion:Nikolsky positivity may be a clue for gammopathy-related subepidermal autoimmune bullous diseases.

  • 标签: subepidermal autoimmun bullous diseases gammopathy MGUS Nikolsky phenomenon case report
  • 简介:Thispaperdealswiththedesignofanoutputfeedbackpredictivecontrollerforinductionmotors.Thefundamentalinterestoftheproposedcontrolleristhecapabilityofdecouplingthemechanicalspeedandtherotorfluxes,withoutdegradationagainstthevariationofrotorresistanceandloadtorque.Hence,thecontributionistoapplytwoestimationproceduresinordertoachievethisgoal.Namely,anunknowninputobserver(UIO)isusedfortheconstanttimeestimationwhereasaheuristicsolutionisexploitedfortheloadtorqueupdate.Moreover,rotorfluxcomponentsarerecoveredasanunavailablestateofthesystem.Effectivenessoftheproposedobserversandtheperformanceofthecontrollerareconfirmedbysimulationresults.

  • 标签: PREDICTIVE controlle UIO Induction motors Parameters
  • 作者: Ran Wang Zhengde Xie
  • 学科: 医药卫生 >
  • 创建时间:2022-12-13
  • 出处:《儿科学研究(英文)》 2022年第03期
  • 机构:Beijing Key Laboratory of Pediatric Respiratory Infectious Diseases, Key Laboratory of Major Diseases in Children, Ministry of Education, National Clinical Research Center for Respiratory Diseases, Laboratory of Infection and Virology, Beijing Pediatric Research Institute, Beijing Children’s Hospita
  • 简介:

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  • 简介:Thispaperaddressestheproblemonsensorfaultestimationandfault-tolerantcontrolforaclassofTakagi-SugenoMarkovianjumpsystems,whicharesubjectedtosensorfaultsandpartiallyunknowntransitionrates.First,theoriginalplantisextendedtoadescriptorsystem,wheretheoriginalstatesandthesensorfaultsareassembledintothenewstatevector.Then,anovelreduced-orderobserverisdesignedfortheextendedsystemtosimultaneouslyestimatetheimmeasurablestatesandsensorfaults.Second,byusingtheestimatedstatesobtainedfromthedesignedobserver,astate-feedbackfault-tolerantcontrolstrategyisdevelopedtomaketheresultingclosed-loopcontrolsystemstochasticallystable.Basedonlinearmatrixinequalitytechnique,algorithmsarepresentedtocomputetheobservergainsandcontrolgains.Theeffectivenessoftheproposedobserverandcontrollerarevalidatedbyanumericalexampleandacomparedstudy,respectively,andthesimulationresultsrevealthattheproposedmethodcansuccessfullyestimatethesensorfaultsandguaranteethestochasticstabilityoftheresultingclosed-loopsystem.

  • 标签: Fault-tolerant control Markovian jump SYSTEM PARTIALLY