共查询到20条相似文献,搜索用时 93 毫秒
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《数学的实践与认识》2016,(23)
针对田口质量损失函数无法描述生产实践中存在的质量补偿效果,在赋予了泰勒级数展开式中常数项的物理意义——质量补偿的基础上,提出了质量损益函数的概念.结合结构方程理论,设计了一类高阶因子模型测算大坝混凝土施工各质量特性对工程质量的质量载荷;考虑质量特性的质量补偿效果,构建了大坝混凝土施工质量容差优化模型,以探求施工阶段各质量特性的最优容差调整率,最大程度改善大坝混凝土施工的整体质量. 相似文献
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陈茂海 《数学的实践与认识》2003,33(5):75-81
本文选用三位式伪随机序列作为输入 ,充分利用其激励信号的各种特性 ,辨识非线性系统 Wiener模型的线性子系统脉冲响应函数 ,对非线性增益环节 ,则由其奇数和偶数项多项式系数分别进行估计 .同时研究线性与非线性子系统辨识的统计特性 ,给出各部分参数估计的置信区间 . 相似文献
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许多同学由于对一元二次方程和一元二次函数概念理解不清,对形如ax2 bx c式子总认为它一定是二次的,不重视对形如ax2 bx c中x2项的系数是否为零的讨论,结果经常出现错误,下面举例说明. 一、在恒成立问题中忽视对ax2 bx c中x2项的系数是否为零的讨论 相似文献
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《数学的实践与认识》2013,(21)
本文借用线性模型系数的Minimax估计方法,在二次损失函数下运用随机优化理论对Gua.ss-Markov非线性模型的系数进行了研究,建立了非线性模型系数Minimax估计的随机优化模型. 相似文献
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混合截尾试验是定时和定数截尾的一种有用的推广。本文研究了Weibull分布和混合截尾试验的一次抽样方案,并对可靠决策损失函数给出了贝叶斯风险的显式表达式。比较陈和林的模型(1999),我们得混合截尾试验的抽样方案于定时抽样方案。 相似文献
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本文研究纵向数据下非参数部分带有测量误差的部分线性变系数模型的估计.利用B样条函数近似模型中的变系数函数,构造偏差修正的二次推断函数,得到模型中未知参数和变系数函数的估计.证明变系数函数估计量的相合性和参数估计量的渐近正态性.数值模拟和实例分析结果表明所提估计方法在有限样本下的有效性. 相似文献
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从股票市场整体出发,研究投资者当期损益结果和前期损益结果对风险偏好的影响,以考察投资者风险偏好的动态特征.主要将GARCH-M模型中的风险补偿系数拓展为随投资者的损益结果发生变化,考察不同时期下投资者的损益状态和损益大小对风险偏好的影响.实证结果表明:投资者在当期收益状态下是风险规避的,在当期损失状态下是风险寻求的;而在前期损失状态下是风险规避的,并且不受前期收益状态的影响.同时,投资者的风险偏好还受不同时期损益大小的影响,其风险规避程度与当期收益大小成正比,风险寻求程度与当期损失大小成正比;对于前期损益大小,其风险规避程度与前期损失大小成正比,并且其风险偏好也不受前期收益大小的影响. 相似文献
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基于非对称损失函数的参数设计 总被引:4,自引:0,他引:4
本文针对望目特性的正态指标,在非对称的二次质量损失函数下,讨论了参数设计的可行性, 证明田口方法的稳健性设计和灵敏度设计依然行之有效.定义了调整参数,求出了使质量损失最小的数值解,并给出了参数设计的具体步骤. 相似文献
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Let A be a subspace arrangement and let (A,t) be the characteristic polynomial of its intersection lattice L( A). We show that if the subspaces in A are taken from
, where
is the type B Weyl arrangement, then (A,t) counts a certain set of lattice points. One can use this result to study the partial factorization of (A,t) over the integers and the coefficients of its expansion in various bases for the polynomial ring R[t]. Next we prove that the characteristic polynomial of any Weyl hyperplane arrangement can be expressed in terms of an Ehrhart quasi-polynomial for its affine Weyl chamber. Note that our first result deals with all subspace arrangements embedded in
while the second deals with all finite Weyl groups but only their hyperplane arrangements. 相似文献
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Marcelo A. Aguilar Martín Eduardo Frías-Armenta 《Topology and its Applications》2007,154(7):1220-1235
Let ξ be a smooth vector bundle over a differentiable manifold M. Let be a generic bundle morphism from the trivial bundle of rank n−i+1 to ξ. We give a geometric construction of the Stiefel-Whitney classes when ξ is a real vector bundle, and of the Chern classes when ξ is a complex vector bundle. Using h we define a differentiable closed manifold and a map whose image is the singular set of h. The ith characteristic class of ξ is the Poincaré dual of the image, under the homomorphism induced in homology by ?, of the fundamental class of the manifold . We extend this definition for vector bundles over a paracompact space, using that the universal bundle is filtered by smooth vector bundles. 相似文献
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A. G. J. MacFarlane 《International Journal of Mathematical Education in Science & Technology》2013,44(4):359-366
The role played by the concepts of characteristic values and characteristic functions in modern control theory is briefly outlined. It is then shown that, by introducing the idea of a characteristic transfer function, the classical stability theorem of Nyquist can be extended to the general multivariable feedback system. 相似文献
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Fredholm's integral equation theory and Mittag-Leffler expansion is used for getting characteristic functions and three ways of expressing the Bernoulli numbers. 相似文献
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We propose a geometric definition of the Euler characteristic (M) for the class of compact epi-Lipschitzian sets MRn and we provide existence theorems of (generalized) equilibria for set-valued mappings F when the domain M of F is neither assumed to be convex, nor smooth but has a nonzero Euler characteristic. 相似文献
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V. V. Kapustin 《Journal of Mathematical Sciences》2000,101(3):3088-3092
A new definition of the characteristic function is introduced for contractions on Hilbert spaces. The relationship with other
definitions is established. A factorization formula corresponding to an invariant subspace is obtained. Bibliography: 3 titles.
Translated fromZapiski Nauchnykh Seminarov POMI, Vol. 247, 1997, pp. 71–78.
Translated by V. V. Kapustin. 相似文献
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P-sets is a set pair, it is composed of internal P-set and outer P-set, it has dynamic characteristic. By using structure of P-sets, dependence theorem and identification theorem are proposed in this paper. 相似文献