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。
简介:Inthispaper,theglobalasymptoticstabilizationbyoutputfeedbackisinvestigatedforaclassofuncertainnonlinearsystemswithunmeasuredstatesdependentgrowth.Comparedwiththecloselyrelatedworks,theremarkablenessofthepaperisthateitherthegrowthrateisanunknownconstantorthedimensionoftheclosed-loopsystemissignificantlyreduced,mainlyduetotheintroductionofadistinctdynamichigh-gainobserverbasedonanewupdatinglaw.Motivatedbytherelatedstabilizationresults,andbyskillfullyusingthemethodsofuniversalcontrolandbackstepping,weobtainthedesignschemetoanadaptiveoutput-feedbackstabilizingcontrollertoguaranteetheglobalasymptoticstabilityoftheresultingclosed-loopsystem.Additionally,anumericalexampleisconsideredtodemonstratetheeffectivenessoftheproposedmethod.
简介:Anovelrotationalinvariancetechniqueforblindestimatesofdirectionofarrival(I)OA)andDopplerfrequencywithunknownarraymanifoldduetoarraysensoruncertaintiesisproposed,takingDopplerfrequencydifferencebetweenasuccessivepulsesasrotationalparameter.Theeffectivenessofthenewmethodisconfirmedbycomputersimulation.Comparedwiththeexisting2-DDOA-frequeucyestimatetechniques,thecomputationloadoftheproposedmethodcanbesavedgreatly.
简介:Thispaperfocusesontheproblemofrobuststabiiizationforaclassoflinearsystemswithuncertainparametersandtimevaryingdelaysinstates.Theparameteruncertaintyiscontinuous,timevarying,andnorm-bounded.Thestatedelayisunknownandtimevarying.Thestatesofthesystemarenotallmeasurableandanobserverisconstructedtoestimatethestates.Ifalinearmatrixinequality(LMI)issolvable,thegainsofthecontrollerandobservercanbeobtainedfromthesolutionoftheLMI.Theobserverandcontrolleraredependentonthesizeoftimedelayandonthesizeofdelayderivative.Finally,anexampleisgiventoillustratetheeffectivenessoftheproposedcontrolmethod.
简介:Twoschemesforteleportinganunknownone-particlestateareproposedwhenageneralWstateisutilizedasquantumchannel.Inthefirstscheme,afterthesender(Alice)makesaBell-statemeasurementonherparticles,therecipient(Bob)performsaVonNeumannmeasurementandintroducesanauxiliaryparticle,andcarriesoutaunitarytransformationonhisparticleandtheauxiliaryparticle,andperformsaVonNeumannmeasurementontheauxiliaryparticletoconfirmwhethertheteleportationsucceedsornot.Inthesecondscheme,therecipient(Bob)doesnotneedtoperformthefirstVonNeumannmeasurementorintroducetheauxiliaryparticle,whichisnecessaryinthefirstscheme.Itisshownthatthemaximalprobabilitiesofsuccessfulteleportationofthetwoschemesareidenticaliftherecipient(Bob)performsanappropriateunitarytransformationandadoptsaproperparticleonwhichherecoversthequantuminformationofstatetobeteleported.
简介:Thispaperproposesaschemewhereonecanrealizequantumcloningofanunknowntwo-atomentangledstatewithassistanceofastatepreparerincavityQED.Thefirststageoftheschemerequiresusualteleportation.Inthesecondstageofthescheme,withtheassistanceofthepreparer,theperfectcopiesofanunknownatomicentangledstatecanbeproduced.
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.
简介:Arobustadaptiverepetitivelearningcontrolmethodisproposedforaclassoftime-varyingnonlinearsystems.Nussbaum-gainmethodisincorporatedintothecontroldesigntocounteractthelackofaprioriknowledgeofthecontroldirectionwhichdeterminesthemotiondirectionofthesystemunderanyinput.Itisshownthatthesystemstatecouldconvergetothedesiredtrajectoryasymptoticallyalongtheiterationaxisthroughrepetitivelearning.Simulationiscarriedouttoshowthevalidityoftheproposedcontrolmethod.
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.
简介:Theproblemofadaptivefuzzycontrolforaclassoflarge-scale,time-delayedsystemswithunknownnonlineardead-zoneisdiscussedhere.Basedontheprincipleofvariablestructurecontrol,adesignschemeofadaptive,decentralized,variablestructurecontrolisproposed.Theapproachremovestheconditionsthatthedead-zoneslopesandboundariesareequalandsymmetric,respectively.Inaddition,itdoesnotrequirethattheassumptionsthatallparametersofthenonlineardead-zonemodelandthelumpeduncertaintyareknownconstants.Theadaptivecompensationtermsoftheapproximationerrorsareadoptedtominimizetheinfluenceofmodelingerrorsandparameterestimationerrors.Bytheoreticalanalysis,theclosed-loopcontrolsystemisprovedtobesemi-globallyuniformlyultimatelybounded,withtrackingerrorsconvergingtozero.Simulationresultsdemonstratetheeffectivenessoftheapproach.
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.
简介:Thispaperdealswiththedesignofanoutputfeedbackpredictivecontrollerforinductionmotors.Thefundamentalinterestoftheproposedcontrolleristhecapabilityofdecouplingthemechanicalspeedandtherotorfluxes,withoutdegradationagainstthevariationofrotorresistanceandloadtorque.Hence,thecontributionistoapplytwoestimationproceduresinordertoachievethisgoal.Namely,anunknowninputobserver(UIO)isusedfortheconstanttimeestimationwhereasaheuristicsolutionisexploitedfortheloadtorqueupdate.Moreover,rotorfluxcomponentsarerecoveredasanunavailablestateofthesystem.Effectivenessoftheproposedobserversandtheperformanceofthecontrollerareconfirmedbysimulationresults.
简介:无
简介:Thispaperaddressestheproblemonsensorfaultestimationandfault-tolerantcontrolforaclassofTakagi-SugenoMarkovianjumpsystems,whicharesubjectedtosensorfaultsandpartiallyunknowntransitionrates.First,theoriginalplantisextendedtoadescriptorsystem,wheretheoriginalstatesandthesensorfaultsareassembledintothenewstatevector.Then,anovelreduced-orderobserverisdesignedfortheextendedsystemtosimultaneouslyestimatetheimmeasurablestatesandsensorfaults.Second,byusingtheestimatedstatesobtainedfromthedesignedobserver,astate-feedbackfault-tolerantcontrolstrategyisdevelopedtomaketheresultingclosed-loopcontrolsystemstochasticallystable.Basedonlinearmatrixinequalitytechnique,algorithmsarepresentedtocomputetheobservergainsandcontrolgains.Theeffectivenessoftheproposedobserverandcontrollerarevalidatedbyanumericalexampleandacomparedstudy,respectively,andthesimulationresultsrevealthattheproposedmethodcansuccessfullyestimatethesensorfaultsandguaranteethestochasticstabilityoftheresultingclosed-loopsystem.