学科分类
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377 个结果
  • 简介:TostudyIgGsubclassesforthehepatitisBvirus(HBV)coreantigen(anti-HBc)indifferentpopulations,acomparisonwasmadebetween104chroniccarriers(60maleand44female)and434recoveredindividuals(247maleand192female).BiochemistryanalysesofAST(aspartateaminotransferase)andALT(alanineaminotransferase)werealsoperformed.Amongthe104chroniccarriers,21patientswerefoundtobeALTandASTabnormal(>25IU/ml).AftercomparingtheseALTandASTabnormalpatientswithotherALTandASTnormalchroniccarriers,nostatisticaldifferencewasobservedintheODvaluesoftheanti-HBe(p>0.05).TheELISAresultsshowedtheanti-HBcIgGsubclasspatternwasIgG1>IgG3>IgG4inchroniccarriersandIgG3>IgG1>IgG4inrecoveredindividuals(p<0.05).ThisresultsuggeststheIgG1/IgG3ratiomayberelatedwithHBVstatus.However,inspiteofthedifferentanti-HBcIgG1/IgG3patternsdemonstratedindifferentpopulations,bothanti-HBcIgG1andIgG3concentrationsweresignificantlyhigherinchroniccarriers(p<0.05).Therefore,boththeanti-HBcIgG1/IgG3ratioandtheiramountsdiffered.Theymayplayasignificantroleinchroniccarriersandrecoveredindividuals.Theanti-HBcIgGsubclassprofilesofchroniccarrierswerenotchangedregardlessofliverinflammation,andwereindependentofsexandage.Cellular&MolecularImmunology.

  • 标签: IGG 乙型肝炎病毒 病毒感染 抗体 人口
  • 简介:Summary:RiskfactorsforgenitourinaryChlamydiatrachomatis(Ct)infectionwereinvestigatedusinganSTDrelativeriskfactorquestionnaireamong176patientsandtheirregularsexualpartners.Twenty-fourindependentvariableswereselectedforanalysis,nineofwhichwereconfirmedasfactorsassociatedwithC.trachomatis.Fouroftheninefactorsweresignificantlycorrelatedtoinfectionusingamultifactorialunconditionallogisticregressionmodelwhichincluded:levelofeducation(oddsratios[ORs]:2.144forbelowjuniormiddleschool),numberofsexualpartners(ORs:4.503for≥5),numberofregularpartner'ssexualpartner(ORs:16.333for≥5),STDhistoryofregularpartner(ORs:18.417fortheirSTDhistory).Thesedatademonstratethatregularpartner'ssexualbehaviorsarealsoanimportantriskfactorforCtinfectionamong,STDclinicclients.

  • 标签: 沙眼衣原体 高危因素 性传播疾病 STD 性行为 性传播感染
  • 简介:Forthemodelpredictivecontroller,terminalstatesatisfyingacertaininequalitycanguaranteethestabilitybutitissomewhatconservative.Inthispaper,wegiveamorerelaxedstabilityconditionbyconsideringtheeffectoftheinitialstate.Basedonthatweproposeanalgorithmtoguaranteethattheclosedloopsystemisasymptoticallystable.Finally,theconclusionsareverifiedbyasimulation.

  • 标签: 预先控制 稳定性 初始状态 终端集 约束条件
  • 简介:Elmannetworks'dynamicalmodelingcapabilityisdiscussedinthispaperfirstly.AccordingtoElmannetworks'uniquestructure,aweighttrainingalgorithmisdesignedandanonlinearadaptivecontrollerisconstructed.WithoutthePEpresumption,neuralnetworkscontroller'sclosed-looppropertiesarestudiedandthewholeElmannetworks'passivityisdemonstrated.

  • 标签: ELMAN网络 动力学模型 非线性控制系统 神经网络
  • 简介:WU-RITT'SMETHODFORNONLINEARCONTROLSYSTEMS¥LIShurong(InstituteofSystemsScience,AcademiaSinica,Beijing100080,China)Abstract:Thi...

  • 标签: Differential ALGEBRA Wu-Ritt’s zero-decomposition THEOREM PROJECTION
  • 简介:ByapplyingtheHeavisidefunction,theequationsgoverninglaminatedplatespossess-ingspatiallydistributedpiezoelectricpatcheshavebeenestablished.Basedontheseequations,staticshapecontroloflaminatedplatesisdiscussed.Byusingageneticandcollocationalgorithm,theopti-mallocationsandscalesofthesepiezoelectricpatcheshavebeenselected.Numericalexamplesarepre-sentedtoillustratetheefficiencyofthealgorithmandthepiezoelectricactuators.

  • 标签: LAMINATED PLATE PIEZOELECTRIC material SHAPE control
  • 简介:Inthispaper,thecontrolpolicyforenvironmentwithtwokindsofirreversibility,whichworkinoppositedirectionsanduncertaintyofcostisregardedasaninvestmentdecision.Byusingreal-optiontheory,thepaperpresentsthemodeloftheoptimalcontrolpolicyforenvironmentunderthescienceandtechnologythatcanreduceenvironmentpollutionstochasticoccur.Thepaperhasdiscussedtheeffectsofchangesinthevariousparametersonthecriticalvalueatwhichthepolicyshouldbeadopted.Theresultsshowthattheoptimalcontrolpolicyisquitesensitivetothescienceandtechnologywhichcanreduceenvironmentpollutionstochasticoccur,pointingtotheimportanceofcarefullyaccountingforitsimpactindeterminingthecontrolpolicyforenvironment.

  • 标签: 最佳控制 实选择 贝尔曼方程 临界值 环境污染
  • 简介:这篇论文处理为补偿联网的控制系统的传动误差和包退学学生在一个开环的评估者和一个靠近环的评估者之间切换的问题。切换的推动被认为以便减少在理论和应用程序之间的错误,为在一条给定的切换的规则下面的联网的控制系统的指数的稳定的一个足够的条件被多重象Lyapunov一样函数介绍。这些结果为连续时间、分离时间的领域被介绍。控制器借助于线性矩阵不平等被设计。模拟结果显示出建议方法的可行性和效率。

  • 标签: 网络控制系统 转换控制 复位映射矩阵 LYAPUNOV函数
  • 简介:Accesscontrolinmulti-domainenvironmentsisoneoftheimportantquestionsofbuildingcoalitionbetweendomains.OnthebasisofRBACaccesscontrolmodel,theconceptsofroledelegationandrolemappingareproposed,whichsupportthethird-partyauthorization.Then,adistributedRBACmodelispresented.Finallytheimplementationissuesarediscussed.

  • 标签: 运算控制 RBAC模型 图论 计算机安全 区域环境
  • 简介:传统的控制策略有困难在地震刺激下面处理结构,时间变量特征和构造控制系统的参数不确定性的非线性的行为。与模糊控制相结合的off-and-towards-equilibrium(OTE)策略在这篇论文被介绍克服这些困难。根据OTE策略,控制力量从在结构,令人激动的力量和控制力量的运动之间的一种机械关系的观点被设计。OTE策略的优点是它能被用于许多控制系统。以便评估建议策略的表演,地震表演一三故事砍用一个模糊逻辑控制器(FLC)与一个活跃的腱系统(ATS)造被学习。模糊控制器的主要优点是它处理结构的任何非线性的行为的固有的坚韧性和能力。然而,没有设计指南为FLC建立相应检核尺桌子。为FLC基于建议策略,在学习下面与大楼联系的一张检核尺桌子被开发,它然后允许一个详细算法的形成。在这研究获得的结果证明建议策略比线性二次的管理者(LQR)稍微好表现策略,当在LQR控制器上拥有几个优点时。因而,建议策略的可行性和有效性被验证。

  • 标签: 建筑结构 振动控制策略 离复位控制算法 模糊控制 地震激励