学科分类
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8 个结果
  • 简介:Byexpandingtheperturbationofcovariancematrixinthepowersofer-rorterm,theinfluencefunctionsforfivecanonicalmeasurementsinCCAaredevel-opedandthreesampleversionsaregiven.Forgeneralizedcorrelationcoefficientp_z,theinfluencefunctionisaquadraticformofr.v.z,anditsdistributionisconsidered.ApracticalexampleiUustratestheutilityoftheproposedinfluencefunctions.

  • 标签: CANONICAL CORRELATION analysis perturbation/influence FUNCTION influential
  • 简介:Toensurethatlimitedresourcesareallocatedmoreeffectivelytoreducemarinerisks,formalsafetyassessment(FSA),aproactivemethod,isintroducedinplanningavesseltrafficsystem(VTS).BasedonthedataofWuhanport,somenewsolutionsbasedonrisk-indicesareputforward.Theweightednumberoftrafficaccidentsispredictedafterthefutureweightedvesseltrafficvolumeisestimatedbyanalyzingthetrendoftradedevelopment.Toanalyzeriskacceptability,theas-low-as-reasonably-practica...

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  • 简介:Thispaperpresentsamethodologytodeterminethreedataquality(DQ)riskcharacteristics:accuracy,comprehensivenessandnonmembership.Themethodologyprovidesasetofquantitativemodelstoconfirmtheinformationqualityrisksforthedatabaseofthegeographicalinformationsystem(GIS).FourquantitativemeasuresareintroducedtoexaminehowthequalityrisksofsourceinformationaffectthequalityofinformationoutputsproducedusingtherelationalalgebraoperationsSelection,Projection,and...

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  • 简介:Inordertoensurethehighestsafetyrequirements,nuclearpowerplantstructures(thecontainmentstructures,thefuelstoragesandtransportationsystems)shouldbeassessedagainstallpossibleinternalandexternalimpactthreats.Theinternalimpactthreatsincludekineticmissilesgeneratedbythefailureofhighpressurevesselsandpipes,thefailureofhighspeedrotatingmachineriesandaccidentaldrops.Theexternalimpactthreatsmaycomefromairbornemissiles,aircraftimpact,explosionblastandfragments.Theimpacteffectsofthesethreatsonconcreteandsteelstructuresinanuclearpowerplantarediscussed.Methodsandproceduresfortheimpactassessmentofnuclearpowerplantsareintroduced.Recentstudiesonpenetrationandperforationmechanicsaswellasprogressesondynamicpropertiesofconcrete-likematerialsarepresentedtoincreasetheunderstandingoftheimpacteffectsonconcretecontainmentstructures.

  • 标签: 碰撞威胁 保护设计 安全评估 围堵结构 核电站
  • 简介:没有它的参考图象或失真类型的优先的知识,盲目图象质量评价(BIQA)能估计一幅弄歪的图象的感性的质量。在这份报纸,一个新奇BIQA模型在小浪领域被开发。就多决定和分离小浪变换(DWT)的band-passing特征而言,在力量光谱上的改进被提出,即,称的小浪力量光谱(WPS)评价。然后,方向性的WPS的概念被使用简化计算。而且,人的视觉系统(HVS)的一个旋转地对称的调整转移函数(MTF)作为一个过滤器综合,它做度量标准与人的视觉感觉和更多一致歧视。实验在实时数据库和三个另外的数据库上被进行,并且结果证明建议度量标准高度与主观评估被相关,它以有效性和坚韧性与另外的最先进的度量标准竞争很好。

  • 标签: 天津大学学报 英文版
  • 简介:欧洲结构的正直评价过程(SINTAP)在焊接脚趾与一个假定嵌入的缺陷和表面缺陷被用于对API5LX65管道钢的焊接关节的评价。在缺省水平(水平()),评价点被从Charpy精力测试数据保存地估计破裂坚韧价值K_lc建立。同时,分析水平(基本水平)1基于破裂坚韧CTOD被使用。然后,二个评价层次被比较。所有评价点位于分析的失败线以内的评价结果表演铺平0并且t。管道的焊接关节因此是安全的。评价基于Charpy吸收了精力,这能被结束当另外的破裂坚韧数据不是可得到的时,是适用的,或不能容易被获得。结果是保守的。

  • 标签: 安全评估 摆锤冲击能 失效评估图 能量吸收 SINTAP 管线钢
  • 简介:Aprobabilisticriskassessmentprocedureisdevelopedwhichcanpredictrisksofexplosiveblastdamagetobuiltinfrastructure,andwhencombinedwithlife-cyclecostanalysis,theprocedurecanbeusedtooptimiseblastmitigationstrategies.Thepaperfocusesonwindowglazingsincethisisaload-capacitysystemwhich,whensubjectedtoblastloading,hascausedsignificantdamageandinjurytobuildingoccupants.Structuralreliabilitytechniquesareusedtoderiveblastreliabilitycurvesforannealedandtoughenedglazingsubjectedtoexplosiveblastforavarietyofthreatscenarios.Theprobabilisticanalysesincludetheuncertaintiesassociatedwithblastmodelling,glazingresponseandglazingfailurecriteria.Damagerisksarecalculatedforanindividualwindowandforwindowsinthefacadeofamulti-storeycommercialbuilding.Thepapershowsanillustrativeexampleofhowthisinformation,whencombinedwithrisk-baseddecision-makingcriteria,canbeusedtooptimiseblastmitigationstrategies.

  • 标签: 风险评估 爆炸损害 结构稳定性 玻璃窗 下部构造 建筑物
  • 简介:Anapproachispresentedtodealwithamulti-attributedecision-makingprobleminwhichtheattributeweightsareunknownandtheattributevaluestaketheformofuncertainlinguisticvariables.First,alinguisticassessmentstandardissetuptodealwiththeuncertainlinguisticattributes,andtheoperationlawsofuncertainlinguisticvariablesandtheuncertainlinguisticweightingaverage(ULWA)operatorareintroduced.Thenarankingformulaofuncertainlinguisticvariablesbasedonexpectation-var...

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