一类具有强奇性的矩阵型偏微分方程的正解的存在性     

双震  孙义静 《中国科学院大学学报》2019,36(3):311-319

研究矩阵型强奇异偏微分方程 其中，Ω⊂Rⁿ是有界开集，M（x）是定义在Ω上的实对称矩阵，-p<-1，0 < q < 1，λ>0是参数，f（x）∈L¹（Ω），f（x）>0 a.e.in Ω。证明，如果存在u₀ ∈H₀¹（Ω）满足∫_Ωf（x）|u₀|^1-pdx <+∞，则对任意的λ>0上述方程都有正H₀¹-解，即慢速解。我们注意到，对于奇异方程，古典解即C²（Ω）∩C（Ω）解不一定是H₀¹（Ω）解。  相似文献   

The work of the audience: visual matrix methodology in museums     

Lynn Froggett  Lizzie Muller  Jill Bennett 《Cultural Trends》2019,28(2-3):162-176

ABSTRACT

Visual matrix methodology has been designed for researching cultural imaginaries. It is an image-led, group-based method that creates a “third space” research setting to observe audience groups re-enacting lived experience of an event or process that takes place in the third space of a cultural setting. In this article, the method is described through its use in relation to an art-science exhibition, Human+ Future of the species, where three audience groups with investments in technology worked with exhibition material to achieve a complex ambivalent state of mind regarding technological futures. The visual matrix has been designed to capture the affective and aesthetic quality of audience engagement in third space by showing what audiences do with what is presented to them. We argue that such methodologies are useful for museums as they grapple with their role as sites where citizens not only engage in dialogue with one another but actively re-work their imaginaries of the future.  相似文献   

Digital Module 05: Diagnostic Measurement—The G‐DINA Framework https://ncme.elevate.commpartners.com     

Wenchao Ma  Jimmy de la Torre 《Educational Measurement》2019,38(2):114-115

In this ITEMS module, we introduce the generalized deterministic inputs, noisy “and” gate (G‐DINA) model, which is a general framework for specifying, estimating, and evaluating a wide variety of cognitive diagnosis models. The module contains a nontechnical introduction to diagnostic measurement, an introductory overview of the G‐DINA model, as well as common special cases, and a review of model‐data fit evaluation practices within this framework. We use the flexible GDINA R package, which is available for free within the R environment and provides a user‐friendly graphical interface in addition to the code‐driven layer. The digital module also contains videos of worked examples, solutions to data activity questions, curated resources, a glossary, and quizzes with diagnostic feedback.  相似文献   

多项式环上一次不定方程的矩阵解法与程序设计     

晏林 《科技通报》2004,20(4):316-319

利用多项式环F[x]上的欧几里德算法给出求解多项式环F[x]上的多元一次不定方程通解的矩阵解法，同时利用MATLAB数学软件给出相应的计算机求解多项式环F[x]上一次不定方程的程序，这种方法可以普遍地应用．  相似文献   

一种基于AHP的企业核心能力识别新方法   总被引：5，自引：0，他引：5  

吴价宝 《科研管理》2003,24(6):114-120

对核心能力的内涵进行了新的定义；分析了现行核心能力定量识别研究存在的问题；运用了平衡记分卡的思想以及波特价值链原理来建立评价指标体系；利用层次分析法(AHP)工具并据此建立核心能力识别矩阵图，对企业核心能力进行了定量化、直观化地识别。  相似文献   

Bond graph models of structured parameter uncertainties     

Casimir Sié Kam 《Journal of The Franklin Institute》2005,342(4):379-399

Taking into account uncertainties in model parameter values is a crucial point for studying robustness in modeling and in control. This paper proposes to construct in a systematic and graphical procedure two forms of the linear state equation usually found in the literature for dealing with the robustness problem in the case of structured uncertainties on parameters. It is shown how to model uncertainties in a bond graph approach, in the case of additive or multiplicative parametric variations.  相似文献   

从国有商业银行的行为分析不良贷款的生成机制   总被引：4，自引：0，他引：4  

曾诗鸿  刘煜辉  段辰菊 《中国软科学》2003,(9):43-48

本文从日本、中国的国有商业银行具有高不良贷款的现实出发研究商业银行各分支机构的经理人员(代理人)的行为,第一部分的引言强调研究国有商业银行各分支机构的经理人员行为的必要性,并且对现有文献进行了回顾。第二部分扩展了基本的监管模型,研究了国有商业银行各分支机构的经理人员(代理人)在支付矩阵下的行为,第三部分得出结论:在我们的研究范围内,银行不良贷款的产生是因为商业银行在不同的行为参数下,依赖自己的行为参数从效用最大化出发进行博弈的结果。  相似文献   

Delineation of Deep Convective Clouds from GMS/IR Image Using Texture Feature Analysis Method     

Li Jun 《中国科学院研究生院学报》1992,(2)

Monitoring the development and evolution of a deep convec-tive system from gcostationary satellite imagery is very important tonowcasting and heavy rainfall estimation.Using combined infrared andvisible imagery to analyse convective clouds is feasible and effective,but unfortunately,visible satellite data are not available at night.Inthis paper,a method of fuzzy clustering scheme based on texture featureanalysis has been put forward to distinguish the deep convective cloudsfrom cirrus and stratiform by use of GMS/IR image.Results from usingonly IR data and using both IR and VIS data are compared and discus-Sed.  相似文献   

异或开关函数的一种新综合方法     

费本初  庄南 《科技通报》1992,8(5):273-277

研究了异或开关函数的综合,以收缩b_j矩阵及分解b_j矩阵为工具,通过矩阵的最小秩和计算,提出一种不受固定极性限制的SSOP最小化算法,并通过实例比较,显示了该方法的优越性.  相似文献   

非协调轴对称杂交应力元单元刚度矩阵的准确建立     

田炯  田宗漱 《中国科学院研究生院学报》1994,(1)

给出新型三类用理性杂交模式、根据一种修正的Ｈｅｌｌｉｎｇｅｒ－Ｒｅｉｓｓｎｅｒ原理、建立高精度非协调轴对称实体旋转有限元时，其单元刚度矩阵的准确计算式。  相似文献