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1.
可变抽样区间的非参数控制图   总被引:1,自引:1,他引:0  
最近几年一些学者研究了可变抽样区间的质量控制图。Amin等提出了可变抽样区间(VSI)的非参数控制图———符号 (Sign)统计量图〔1〕。本文在此基础上研究位置VSI符号控制图的制定方法 ,并设计离散VSI符号控制图。符号控制图的优点是对非正态总体亦可应用 ,并且不需要过程方差的信息。本文将所设计的VSI符号控制图同固定抽样区间 (FSI)的常规图作比较 ,并举实例说明符号控制图的应用  相似文献   

2.
区组设计的平衡性是对区组设计研究的重要概念,而组间平衡是其中基于重复次数概念的一种平衡性.探讨了组间平衡性的相关哲学概念和数学性质,并且从理论上证明了组间平衡区组设计的数学判定条件,并给出了计算机验证组间平衡性的方法.作为应用,在一般象数学的试验设计模型的基础上,证明了具有组间平衡性质的广义正交表,不但使得试验因子效应的估计无偏和方差最小,而且可以使得对试验中心值或者总体均值的估计无偏和方差最小,并且在区组试验数据较大时,其估计和区组大小的分解式基本无关,保证试验的数据分析结论具有再现性.  相似文献   

3.
基于结构方程(SEM)理论,以2008年统计数据为样本对影响城市现代化的测量指标进行了一阶、二阶验证性因素分析,得到了结构方程模型.并以测量指标在因子上的负荷、路径系数为基础构建权重,建立了城市现代化水平综合评价模型.对我国重要城市(直辖市、主要省会城市)现代化水平程度进行了相对评价,得到较为满意的结果.  相似文献   

4.
测量系统分析是质量改进活动中的一个重要问题,评价测量系统精确度的标准方法是量具的重复性和再现性(R&R)研究,这种研究通常采用试验设计方法,而且对测量对象可以重复测量。然而在工业实践中,当遇到破坏性测量时,这种标准的R&R研究方法是无法实施的。本文给出了破坏性测量中测量系统波动源分析的一种方法,首先分析了破坏性测量中进行量具R&R研究的前提条件,进而给出了进行量具R&R研究的随机效应模型和方差分析方法;最后通过应用Minit-ab.14软件,对工业实践中的一个应用实例进行了分析。  相似文献   

5.
本文研究了两种ZIP模型,比较了一般ZIP回归模型和ZIP(τ)模型对相同的零膨胀(zero-inflated)计数数据的拟合效果,发现前者在拟合时有较好的稳定性,并在此基础上得出实际数据中两种模型应用的技巧以及需要注意的问题。同时研究了ZIP模型在保险费率厘定中的应用,将这两种模型分别应用于保险数据,发现在拟合和预测两方面,ZIP回归模型都明显优于ZIP(τ)模型。  相似文献   

6.
李克特式量表是社会科学研究中常用的计分方式,但也有为数不少的研究采用模糊语言量化方式.为了了解模糊语言的计分性质,文中以梯形模糊数为例,对李克特式量表与模糊语言的计分误差进行了比较.仿真结果表明,模糊语言量表计分误差小于李克特式量表,从而为模糊语言量表的应用者以及相关的研究者提供了参考.  相似文献   

7.
布尔函数的相关免疫与相对平衡性   总被引:2,自引:1,他引:1  
平衡性和相关免疫性是函数的两个重要密码特性 ,但目前对两者之间的关系还没有得到很好地研究 .本文拟对布尔函数的平衡性和相关免疫性之间的关系作一些探讨 ,引进相对平衡性的概念 ,讨论相对平衡与通常的平衡概念的关系 ,得到布尔函数的关于相关免疫性和平衡性的一个充要条件  相似文献   

8.
利用高分辨快电子能量损失谱仪,采用高分辨的dipole(e,e)方法对氦原子的光学振子强度进行了研究.它避免了光学测量中的困难,提高了实验精度.在21~26 eV的能量损失范围内测量得到了氦的I1S→n1P中跃迁以及电离过程的光学振子强度谱,并在59~67eV和 69~74eV的能量损失范围内对氦的自电离共振过程的光学振子强度谱进行了研究,所得结果与前人的工作进行了比较.  相似文献   

9.
合格品链长控制图   总被引:3,自引:1,他引:2  
在生产过程中不合格品率(p)很低的情况下,利用两个连续不合格品之间的合格品数(合格品链长)控制图来监督过程不合格品率能克服传统的p图所遇到的困难,为生产者提供产品质量改良的信息。本文研究两种合格品链长(CRL)控制图的制定方法,对这些控制图的效率进行了比较,并说明其实际应用。所研究的CRL控制图特别适用于自动化生产过程的100%检验的质量控制。  相似文献   

10.
采用光刻法制备出微米尺度的硅微方柱结构,并利用化学气相沉积的方法在其上可控地生长定向碳纳米管,由此制备出具有可控比例微纳二级结构的超疏水表面.通过扫描电子显微镜(SEM)测量和接触角、滚动角测试的方法对具有不同微纳结构比例及尺寸的表面形貌和性能进行探查和测试,对制备过程中参数的选择做出了优化处理.得到了表面性质均匀、稳定的二级结构超疏水表面.通过粒子图像测速(PIV)的方法测量在结构表面滚动液滴的内部流动形态,并与一级结构表面进行对比.分析并总结了该文中表面的疏水机理及表面微纳结构比例、形态、尺寸等因素对疏水性能的影响.  相似文献   

11.
Hybrid systems with memory are dynamical systems exhibiting both delayed and hybrid dynamics. Such systems can be described by hybrid functional inclusions. Classical invariance principles play an instrumental role in proving stability and convergence of dynamical systems. Invariance principles for general hybrid systems with delays, however, remain an open topic. In this paper, we prove invariance principles for hybrid systems with memory, using both Lyapunov–Razumikhin function and Lyapunov–Krasovskii functional methods. These invariance principles are then applied to derive two stability results as corollaries.  相似文献   

12.
In this paper, we consider an initial value problem for a class of generalized ODEs, also known as Kurzweil equations, and we prove the existence of a local semidynamical system there. Under certain perturbation conditions, we also show that this class of generalized ODEs admits a discontinuous semiflow which we shall refer to as an impulsive semidynamical system. As a consequence, we obtain LaSalle's invariance principle for such a class of generalized ODEs. Due to the importance of LaSalle's invariance principle in studying stability of differential systems, we include an application to autonomous ordinary differential systems with impulse action at variable times.  相似文献   

13.
The generation of priority vectors from pairwise comparison information is an integral part of the Analytic Hierarchy Process (AHP). Traditionally, either the right eigenvector method or the logarithmic least squares method have been used. In this paper, a goal programming method (GPM) is presented that has, as its objective, the generation of the priority vector whose associated comparison values are, on average, the closest to the pairwise comparison information provided by the evaluator. The GPM possesses the properties of correctness in the consistent case, comparison order invariance, smoothness, and power invariance. Unlike other methods, it also possesses the additional property that the presence of a single outlier cannot prevent the identification of the correct priority vector. The GPM also has a pair of naturally meaningful consistency indicators that offer the opportunity for empowering the decision maker. The GPM is thus an attractive alternative to other proposed methods.  相似文献   

14.
15.
This paper extends the notion of generalized joint spectral radius with exponents, originally defined for a finite set of matrices, to probability distributions. We show that, under a certain invariance condition, the radius is calculated as the spectral radius of a matrix that can be easily computed, extending the classical counterpart. Using this result we investigate the mean stability of switching systems. In particular we establish the equivalence of mean square stability, simultaneous contractibility in square mean, and the existence of a quadratic Lyapunov function. Also the stabilization of positive switching systems is studied. Numerical examples are given to illustrate the results.  相似文献   

16.
In this paper we consider a model describing predator–prey interactions in a chemostat that incorporates genreal response functions and distinct removal rates. In this case, the conservation law fails. To overcome this problem, we use Liapunov functions in the study of the global stability of equlibria. Mathematical analysis of the model equations with regard to invariance of non-negativity, boundedness of solutions, dissipativity and persistence are studied. Hopf bifurcation theory is applied.  相似文献   

17.
贝叶斯方法可以有效的处理信用风险度量中常见的数据缺失问题,而且为科学使用专家意见等主观经验提供了有效途径,已被广泛应用于信用风险度量领域。本文从模型构建、估计方法及模型比较三个方面对应用贝叶斯方法度量信用风险的重要文献进行综述,重点关注信用风险的违约相关性和风险蔓延性等最新研究热点,为深入研究信用风险度量问题提供参考,并引起国内风险分析人员对贝叶斯方法的兴趣。  相似文献   

18.
In this paper, we investigate the dynamics of a multigroup disease propagation model with distributed delays and nonlinear incidence rates, which accounts for the relapse of recovered individuals. The main concern is the stability of the equilibria, sufficient conditions for global stability being obtained by applying Lyapunov‐LaSalle invariance principle and using Lyapunov functionals, which are constructed using their single‐group counterparts. The situation in which the deterministic model is subject to perturbations of white noise type is also investigated from a stability viewpoint.  相似文献   

19.
The measure of distinguishability between two neighboring preparations of a physical system by a measurement device naturally defines a line element on the preparation space of the system. We show that quantum mechanics can be derived from the invariance of this line element in the canonical formulation. We also discuss the canonical formulation of quantum statistical mechanics. __________ Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 147, No. 3, pp. 479–486, June, 2006.  相似文献   

20.
In this paper, we investigate a new class of dynamical systems for solving variational inclusion and fixed point problems on Hadamard manifolds. Then we prove that the dynamical system has a unique solution under some suitable assumptions. Moreover, the global exponential stability and invariance property of the dynamical systems are also established. Our main results in this work are new and extend the existing ones in the literature.  相似文献   

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