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概率分布间随机序在实践中已经得到了广泛的应用,而且似然比检验是用以检验涉及随机序问题的最普遍的检验方法.但是,关于多个多项式总体间的增凸序约束的统计推断问题并没有得到充分发展.多样本的增凸序对无约束的检验问题已被研究.然而,多总体的相等性对增凸序的假设检验问题似乎更有研究意义.并且分布的相等对随机序的假设检验问题往往是统计学家最为普遍地考虑.对多样本的情况,本文考虑了分布的相等对增凸序的假设检验问题,并且获得似然比检验统计量的零渐近分布,它是一组x~2分布随机变量的加权和,即■~2分布. 相似文献
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研究了两个相互独立的Ⅰ型极大值分布随机变量间的随机序,似然比序,危险率序及凸序之间的相互关系,给出了两个相互独立但不同分布的随机变量满足各种随机序时其分布所含参数间的相应关系.文中也给出了两组相互独立但不同分布的随机变量极值间在一般随机序下的大小关系. 相似文献
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研究了两个相互独立的逆Weibull分布随机变量间的随机序,似然比序,危险率序以及凸序之间的相互关系,给出了两个相互独立但不同分布的随机变量满足各种随机序时其分布所含参数间的相应关系.也给出了两组相互独立但不同分布的随机变量极值间在一般随机序下的大小关系. 相似文献
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本文基于分散型和(或)扩散型随机序,利用随机变量的剩余寿命给出了寿命分布类ILR,IFR,DMRL和IFR(2)及其对偶类的刻画.作为主要结果的一个应用,用k/n-系统的剩余寿命对IFR和DMRLS及其对偶类进行了刻画.这些结果拓宽和加强了文献中已有的结果. 相似文献
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同单调相依结构下两重生命模型的概率分布 总被引:4,自引:0,他引:4
在寿险实务中,在处理涉及到多个生命的问题时往往假设各个生命之间是独立的,但事实上,因为受某些相同因素影响的生命之间总是存在一定的正相依性.本文证明了在给定边际分布的二维随机向量中,同单调相依结构是在相关序意义下最强的正相依结构,研究了在此相依结构下的两重生命模型的概率分布,并给出了随机序意义下两个状态消亡时间的随机上界和随机下界. 相似文献
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借助于矩阵对的标准相关分解,导出了极限limλ→0 X(λI YAX)-1 Y存在的充分必要条件,在极限存在的情况下,给出了极限的表达式,并讨论了结果的一些应用. 相似文献
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1.引 言 设A∈Cm×n,M和N分别为m和n阶Hermite正定阵,考虑下列方程 (1) AXA=A (2) XAX=X (3)(AX)*=AX (4)(XA)*=XA (3M)(MAX)*=MAX (4N)(NXA)*=NXA 如果X∈Cn×m满足条件(1)和(2),则称X为A的自反广义逆,记作X=A(1,2);如果 X满足条件(2),则称X为 A的{2}逆,记作 X=A(2);如果X满足(1)-(4),则称X为 A的 M-P逆,记作X=A+;如果X满足(1)、(2)、(3M)、(4N),则称 X为 A的加权… 相似文献
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Feature extraction using two-dimensional local graph embedding based on maximum margin criterion 总被引:1,自引:0,他引:1
In this paper, we propose a novel method for image feature extraction, namely the two-dimensional local graph embedding, which is based on maximum margin criterion and thus not necessary to convert the image matrix into high-dimensional image vector and directly avoid computing the inverse matrix in the discriminant criterion. This method directly learns the optimal projective vectors from 2D image matrices by simultaneously considering local graph embedding and maximum margin criterion. The proposed method avoids huge feature matrix problem in Eigenfaces, Fisherfaces, Laplacianfaces, maximum margin criterion (MMC) and inverse matrix in 2D Fisherfaces, 2D Laplacianfaces and 2D Local Graph Embedding Discriminant Analysis (2DLGEDA) so that computational time would be saved for feature extraction. Experimental results on the Yale and the USPS databases show the effectiveness of the proposed method under various experimental conditions. 相似文献
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在分销系统中,对库存补货策略进行科学管理与控制是一直是学者们研究的热点之一,学术界始终没有有效提高三个传统库存补货策略运作效率的有效方法.在两个传统补货策略(EB(echelon-based),TB(time-based))策略的基础上,从减少EB和TB策略的极端情况角度,提出了混合策略1(HBl,Hybrid Based Policy1)和混合策略2(HB2,Hybrid Based Policy2),并将HB1和HB2的优点结合起来形成双混合策略(RH,Re-Hybrid Policy).数值试验表明,HB1、HB2对EB、TB的总成本费用比率有不同程度的改善,同时RH能有效改善HB1、HB2的总成本费用比率. 相似文献
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In this article the constant and the continuous linear boundary elements methods (BEMs) are given to obtain the numerical solution of the coupled equations in velocity and induced magnetic field for the steady magneto-hydrodynamic (MHD) flow through a pipe of rectangular and circular sections having arbitrary conducting walls. In recent decades, the MHD problem has been solved using some variations of BEM for some special boundary conditions at moderate Hartmann numbers up to 300. In this paper we develop this technique for a general boundary condition (arbitrary wall conductivity) at Hartmann numbers up to 105 by applying some new ideas. Numerical examples show the behavior of velocity and induced magnetic field across the sections. Results are also compared with the exact values and the results of some other numerical methods. 相似文献
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Discrete autoregressive process of order 1 (DAR(1)) has been used as a popular stochastic model for correlated traffic sources because it parsimoniously uses a single parameter to capture the desirable correlation structure. In contrast with DAR(1), discrete autoregressive process of order 2 (DAR(2)) uses one more parameter to provide a much richer pattern in the autocorrelation function and is able to capture slower decay rate and longer memory. To investigate how the additional traffic parameter in DAR(2) influences the queueing performance, this paper provides an analysis of the discrete‐time DAR(2)/D/1 queue. The performance measures concerned are the mean and second‐order statistics of queue size, which are both important in the queueing systems seen in telecommunication networks. Under a mild condition, these performance indices are derived in closed form that allows for efficient computing. An approximate version of these results is also developed to relax the condition and cover more general sources, and both versions serve as a simple tool set for performance evaluation. The numerical examples use this tool to demonstrate that the DAR(2) source may cause up to 30% poorer performance than DAR(1) when the traffic is heavy, bursty, and highly correlated. This indicates that the effect from slower decay rate in autocorrelation is not negligible and using the extra parameter is necessary particularly when the queue is heavily loaded with correlated traffic. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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Using an extended activated sludge model to simulate nitrite and nitrate variations in TNCU2 process
In this study, an extended activated sludge model was established to describe the transformation of nitrite (SNO2), nitrate (SNO3) and other components in TNCU2 process (National Central University of Taiwan No. 2) that consisted of anaerobic, oxic, anoxic, oxic zones in sequence. The significant differences between this extended model and other models were that two-stage nitrification, multi-stage denitrification, and phosphorus removal were taken into account simultaneously. The results indicated that the growth rate constants of XAOB and XNOB were 1.4 and 0.4 d−1, respectively. YAOB value was 0.14 and YNOB value was 0.04. According to model simulation, the heterotrophic microorganism (XH), phosphorus accumulating organism (XPAO), XAOB and XNOB concentrations were 1160–1322, 182–226, 21–26 and 13–17 mg l−1, respectively, in TNCU2 process. XH,XPAO,XAOB, and XNOB decreased in the anaerobic tanks because of the lysis reaction. Then XH,XPAO,XAOB, and XNOB increased in the aerobic tanks due to aerobic growth. XH,XPAO,XAOB, and XNOB increased in quantities by about 5%, 6%, 6% and 4% in the first aerobic tank and decreased in quantities by about 12%, 19%, 20% and 19% in the anoxic tank in which the step feeding influent flowed. The ratio of total nitrifying species to total active biomass was about 3% in each tank. 相似文献
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Josep Elgueta 《Advances in Mathematics》2007,213(1):53-92
In this paper the representation theory of 2-groups in 2-categories is considered, focusing the attention on the 2-category Rep2MatK(G) of representations of a 2-group G in (a version of) Kapranov and Voevodsky's 2-category of 2-vector spaces over a field K. The set of equivalence classes of such representations is computed in terms of the invariants π0(G), π1(G) and [α]∈H3(π0(G),π1(G)) classifying G, and the categories of intertwiners are described in terms of categories of vector bundles endowed with a projective action. In particular, it is shown that the monoidal category of finite dimensional linear representations (more generally, the category of [z]-projective representations, for any given cohomology class [z]∈H2(π0(G),K∗)) of the first homotopy group π0(G) as well as its category of representations on finite sets both live in Rep2MatK(G), the first as the monoidal category of endomorphisms of the trivial representation (more generally, as the category of intertwiners between suitable 1-dimensional representations) and the second as a non-full subcategory of the homotopy category of Rep2MatK(G). 相似文献
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应用数学机械化方法研究欧氏空间中$SU(2)$ Yang-Mills规范场的存在性问题.首先对YM--方程的结构进行了讨论,说明YM--方程由它的奇部份和偶部份联立组成.对于YM--方程构造了一类线性微分变换,称之为$SU(2)$规范场的示性变换.经示性变换,将非线性的YM--方程的奇部份变为一组Laplace方程,实现了$SU(2)$规范场方程的线性化.从而证明了$SU(2)$规范场存在3个独立的Yang-Mills规范场. 相似文献
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度量与线性性质是赋范空间的重要性质,因此,研究线性算子与等距算子的关系成为了泛函分析领域重要的研究课题.本文首先研究一类特殊的赋准范空间,即bp(2)空间的重要性质.然后给出bp(2)空间单位球面间满等距映射的表示定理及延拓性质. 相似文献