具有二次函数型协差阵的多参数指数族

对以均值为参数的多参数指数族,本文指出,协差阵元素为均值的k阶多项式时,其Bh-阵具有简单形式:它的子块B(i,j)=0,对j>(k-1)(i-1)+1,i=1,2,…,于是对k≥2(二次函数型协差阵)情形,Bh-阵的非对角子块均为零阵。本文给出了其对角子块的递推表达式,最后我们讨论了k≤2情形的多参数指数族形式。可看出它们基本是单参数指数族k≤2情形的自然推广。     

强度≥3混合覆盖阵的构造

混合水平覆盖阵,简称混合覆盖阵,是广泛应用于软件、硬件和网络测试的覆盖阵一种推广形式.设N,t,k,v_i(i=1,2,…,k)为正整数,其中2≤t≤k.混合覆盖阵MCA(N;t,k,(v_1,v_2,…,v_k))是一个N×k阵列,其第i列上元素取自大小为v_i的符号集V_i,且满足任意N×t子阵列包含其符号集上所有t-元组至少一次.本文给出了强度≥3混合覆盖阵的若干构造方法,运用这些构造和相关已知结果.得到了若干最优强度≥3混合覆盖阵.     

DISTRIBUTION OF THE（0，∞）ACCUMULATIVE LINES OF MEROMORPHIC FUNCTIONS

Suppose that f(z)is a meromorphic function of order λ（0<λ<+∞）and of lower order μ in the plane.Let ρ be a positive number such that μ≤ρ≤λ.(1)If f^(l)(z)(0≤l<+∞）has p(1≤p<+∞）finite nonzero deficient valnes αi(i=1,…，p)with deficiencies δ（αi,f^(l)),then f(z)has a (0,∞）accumulative line of order ≥ρin any angular domain whose vertex is at the origin and whose magnitude is larger than max(π/ρ，2π-4/ρ ∑i=1^p arcsin √δ（αi,f^(l))/2).(2)If f(z) has only p(0<p<+∞）（0,∞）,accumulative lines of order≥ρ：arg z=θk(0≤θ1<θ2<…<θp<2π，θp+1=θ1+2π）,then λ≤π/ω，where ω=min I≤k≤p(θk+1-θk),provided that f^(l)(z)(0≤l<+∞）has a finite nonzero deficient value.     

含根式不等式的处理方法

含根式不等式因技巧性较强,历年来颇受命题者喜爱,下面请欣赏几例. 一、三角代换例1 已知xi≥0,x0=0,sum from i=0 to nxi=1.求证:sum from i=1 to n xi/(1+x0+…+xi-1)(xi+…+xn)~(1/2)<π/2.证明 令x0+…+xi-1=sinθi-1,0=θ0≤θ1≤θ2≤…≤θn=π/2.则原式=sum from i=1 to n sinθi-sinθi-1/cosθi-1     

任意阶Laplace算子的特征值估计

设D为n维Euclid空间Rn的一个有界区域,且0＜λ1≤λ2≤…≤λk≤…是l阶Laplace算子的Dirichlet问题{(-△)lu=λu, 在D中,u=(e)u/(e)n=…=(e)l-1u/(e)nl-1=0,在(e)D上的特征值.得到了该问题用其前k个特征值来估计第(k+1)个特征值λk+1的不等式k∑i=1(λk+1-λi)≤1/n(4l(n+2l-2)]1/2{k∑i=1(λk+1-λi)1/2λil-1/lk∑i=1(λk+1-λi)1/2λi1/l}1/2,此不等式不依赖于区域D.对l≥3,上述不等式比所有已知的结果都要好.陈庆民与杨洪苍考虑了l=2的情形.我们的结果是他们结果的自然推广.当l=1时,我们的不等式蕴含杨洪苍不等式的弱形式.文中还给出了陈和杨的一个断言的直接证明.     

强收敛意义下岭回归的 C_L 和 GCV 准则的渐近最优性

设有回归模型Y_i=μ_i+e_i,i=1,2,…,n (1)假定 e_1,…,e_n 为 iid.的正态随机变量序列,具有共同的均值0和方差σ~2.每个 Y_i 可通过设计点列 x_(i1),x_(i2),…,x_i_p_n 观察到.为估计 Y=(Y_1,…,Y_n)′的未知均值 μ=(μ_1,…,μ_n)′,可构造一族岭估计(?)(h)=X(X′X+hI)~-1X′Y,h≥0,(2)其中 X=(x_ij)_(n×ρn) 为设计阵,I 为 p_n 阶单位阵.在这里,岭参数 h 的选择是一个十分     

相依假设下样本相关矩阵最大元的渐近分布

设{Xk,i;k≥1,i≥1)是一随机变量组列,令{pn;n≥1)是一正整数序列,满足c1≤n/pn≤c2,其中c1,c2是正实数.假设{Xk,i;k≥1,i≥1}满足一些相依条件,得到了Ln的渐近分布,这里Ln= ,以及表示(X1,i,…,Xn,i)'和(X1,j,…,Xn,j)'间的Pearson相关系数.     

关于多项式系数的整除性

设 n是正整数 ,k1 ,k2 ,… ,ks 是适合 k1 +k2 +… +ks=n的非负整数 ,正整数 nk1 k2 … ks=n!k1 !k2 !… ks!称为多项式系数 .本文讨论了当n=a0 +a1 p+a2 p2 +… +arpr ,其中 p为素数且 p≤ n,0≤ ai相似文献   

指标在T_θ~d上变动的B-值I.I.D.R.V.’S的叠对数律

记B是可分Banach空间,X是B-值随机变量,N~d={■=n_1,…,n_d);n_i=1,2,…,i=1,…,d},T_θ~d={■∈=(n_1,…,n_d),θn_i≤n_y≤θ~(-1)n_4,i≠j,i,j=1,…,d},其中d≥2,0<1。本文研究指标在T_θ~d上变动的B-值i. i. d. r. v. ’s的四种类型的叠对数律(即BLIL~(θ,α)_1,BLIL~(θ,d)_2CLIL~(θ.D)_1和GLIL~(θ,d)_2,获得了X∈BLIL~(θ,α)_1、X∈BLIL~(θ,d)_2、X∈GLIL~(θ,d)_1和X∈GLIL~(θ,d)_2的充要条件。     

二次损失下方差分量模型中回归系数线性估计的-可容许性

一、问题和结果考虑方差分量模型(?)(1.1)其中 X 为已知的 n×p 阶矩阵,V_i≥0,i=1,2,…,m,已知,β∈R~p,θ_i≥0或θ_i>0,i=1,2,…,m 都是参数.我们要估计线性可估函数 Sβ,S 为已知的 k×p 矩阵,选取估计类     

Qualitative Analysis of Bifurcating Solutions in the Lengyel-Epstein Model

One of the most fundamental problems in theoretical biology is to explain the mechanisms by which patterns and forms are created in the＇living world. In his seminal paper ＂The Chemical Basis of Morphogenesis＂, Turing showed that a system of coupled reaction-diffusion equations can be used to describe patterns and forms in biological systems. However, the first experimental evidence to the Turing patterns was observed by De Kepper and her associates（1990） on the CIMA reaction in an open unstirred reactor, almost 40 years after Turing＇s prediction. Lengyel and Epstein characterized this famous experiment using a system of reaction-diffusion equations. The Lengyel-Epstein model is in the form as follows     

RECENT PROGRESS ON SPHERICAL HARMONIC APPROXIMATION MADE BY BNU RESEARCH GROUP ——In memory of Professor Sun Yongsheng

As early as in 1990, Professor Sun Yongsheng, suggested his students at Beijing Normal University to consider research problems on the unit sphere. Under his guidance and encouragement his students started the research on spherical harmonic analysis and approximation. In this paper, we incompletely introduce the main achievements in this area obtained by our group and relative researchers during recent 5 years （2001-2005）. The main topics are： convergence of Cesaro summability, a.e. and strong summability of Fourier-Laplace series; smoothness and K-functionals; Kolmogorov and linear widths.     

(0,1 ;0)-INTERPOLATION ON INFINITE INTERVAL (-∞, +∞)

In this paper, we study the explicit representation and convergence of (0, 1; 0)-interpolation on infinite interval, which means to determine a polynomial of degree ≤ 3n - 2 when the function values are prescribed at two set of points namely the zeros of Hn(x) and H′n(x) and the first derivatives at the zeros of H′n(x).     

On a class of self-similar processes with stationary increments in higher order Wiener chaoses

We study a class of self-similar processes with stationary increments belonging to higher order Wiener chaoses which are similar to Hermite processes. We obtain an almost sure wavelet-like expansion of these processes. This allows us to compute the pointwise and local Hölder regularity of sample paths and to analyse their behaviour at infinity. We also provide some results on the Hausdorff dimension of the range and graphs of multidimensional anisotropic self-similar processes with stationary increments defined by multiple Wiener–Itô integrals.     

A REPRESENTATION FORMULA RELATED TO SCHR(O)DINGER OPERATORS

Schr(o)dinger operator is a central subject in the mathematical study of quantum mechanics.Consider the Schrodinger operator H = -△ V on R, where △ = d2/dx2 and the potential function V is real valued. In Fourier analysis, it is well-known that a square integrable function admits an expansion with exponentials as eigenfunctions of -△. A natural conjecture is that an L2 function admits a similar expansion in terms of "eigenfunctions" of H, a perturbation of the Laplacian (see [7], Ch. Ⅺ and the notes), under certain condition on V.     

Journal of the Operations Research Society of China Special issue on Operations Research in Healthcare Management

正Guest Editors:Hong Chen,Shanghai Jiao Tong University,Shanghai,China Guohua Wan,Shanghai Jiao Tong University,Shanghai,China David Yao,Columbia University,New York,USA Scope:Healthcare delivery worldwide has been fraught with high cost,low efficiency and poor quality of patient care service.For the field of operations research(OR),healthcare offers some of the biggest challenges as well as best opportunities in     

ANALYSIS IN THEORY AND APPLICATIONS Vol. 30, 2014 CONTENTS

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On a class of Riemann surfaces

It is considered the class of Riemann surfaces with dimT1 = 0, where T1 is a subclass of exact harmonic forms which is one of the factors in the orthogonal decomposition of the spaceΩH of harmonic forms of the surface, namely The surfaces in the class OHD and the class of planar surfaces satisfy dimT1 = 0. A.Pfluger posed the question whether there might exist other surfaces outside those two classes. Here it is shown that in the case of finite genus g, we should look for a surface S with dimT1 = 0 among the surfaces of the form Sg\K , where Sg is a closed surface of genus g and K a compact set of positive harmonic measure with perfect components and very irregular boundary.     

Boundedness for commutators of multipliers on Hardy type spaces

In this paper, we study the commutators generalized by multipliers and a BMO function. Under some assumptions, we establish its boundedness properties from certain atomic Hardy space Hb^p（R^n） into the Lebesgue space L^p with p 〈 1.