PARTIALLY EQUINEIGHBOURED DESIGNS

This paper presents further results on a class of designs called equineighboured designs, ED. These designs are intended for field and related experiments, especially whenever there is evidence that observations in the same block are correlated. An ED has the property that every unordered pair of treatments occurs as nearest neighbours equally frequently at each level. Ipinyomi (1986) has defined and shown that ED are balanced designs when neighbouring observations are correlated. He has also presented ED as a continuation of the development of optimal block designs. An ED would often require many times the number of experimental materials needed for the construction of an ordinary balanced incomplete block, BIB, design for the same number of treatments and block sizes. Thus for a relatively large number of treatments and block sizes the required minimum number of blocks may be excessively large for practical use of ED. In this paper we shall define and examine partially equineighboured designs with n concurrences, PED (n), as alternatives where ED are practically unachievable. Particular attention will be given to designs with smaller numbers of blocks and for which only as little balance as possible may be lost.     

On the asymptotic efficiency of aligned-rank tests in randomized block designs

This paper is concerned with the ranking-after-alignment procedure, the alignment being made on the mean, in randomized block designs. The asymptotic efficiencies, as the number of blocks goes to infinity, of a class of aligned-rank tests, relative to the maximin most powerful test based on aligned observations, are established and studied. Some asymptotic efficiencies under doubleexponentiality are also obtained using Monte Carlo methods.     

Embedding of orthogonal arrays of strength two and deficiency greater than two

Let x ≥ 0 and n ≥ 2 be integers. Suppose there exists an orthogonal array $\text{A(n, q, μ}{}^1\text{)}$ of strength 2 in n symbols with q rows and $\text{n}{}^2\text{μ}{}^1$ columns where $\text{q = q}{}^1\text{? d, q}{}^1\text{= n}{}^2\text{x + n + 1}$, $\text{μ}{}^1\text{= (n ?}\text{1}\text{)x +}\text{1}$ and d is a positive integer. Then d is called the deficiency of the orthogonal array. The question of embedding such an array into a complete array $\text{A(n, q}{}^1\text{, μ}{}^1\text{)}$ is considered for the case d ≥ 3. It is shown that for d = 3 such an embedding is always possible if n ≥ 2(d ? 1)²(2d² ? 2d + 1). Partial results are indicated if d ≥ 4 for the embedding of a related design in a corresponding balanced incomplete block design.     

幼儿积木游戏中空间技能、空间语言与建构水平研究的新进展

积木游戏能够促进幼儿空间技能和空间语言的发展,积木游戏中幼儿的建构水平也与空间技能、空间语言相关。从积木游戏促进幼儿空间能力发展的脑机制研究,空间技能、空间语言与建构水平的关系,以及相应的测量方法分析了与积木游戏相关的研究进展。未来关于积木游戏中空间技能、空间语言、建构水平的研究可同时考虑这三者之间的关系,在借鉴国外相关测量工具时要注意汉化,更全面的了解幼儿建构水平的发展轨迹。     

A bayesian approach to the comparison of two means

A hierarchical Bayesian approach to the problem of comparison of two means is considered. Hypothesis testing, ranking and selection, and estimation (after selection) are treated. Under the hypothesis that two means are different, it is desired to select the population which has the larger mean. Expressions for the ranking probability of each mean being the larger and the corresponding estimate of each mean are given. For certain priors, it is possible to express the quantities of interest in closed form. A simulation study has been done to compare mean square errors of a hierarchical Bayesian estimator and some of the existing estimators of the selected mean. The case of comparing two means in the presence of block effects has also been considered and an example is presented to illustrate the methodology.     

一种设计开关电容滤波器的系统方法

提出了一种开关电容滤波器（ＳＣＦ）设计的系统方法，即利用线性变换原理和压控电源等效变换技术，可以模拟ＡＲＦ滤波器直接设计成ＳＣＦ；给出了７个设计ＳＣＦ的基本积木块。该方法可成功设计各种ＳＣＦ，特别适宜于带通和低通ＳＣＦ的设计，并举例说明了该方法的优越性。     

Two-dimensional balanced sampling plans excluding adjacent units

Hedayat et al. [Sampling plans excluding contiguous units. J. Statist. Plann. Inference 19, 159–170, Designs in survey sampling avoiding contiguous units. In: Krishnaiah, P.R., Rao, C.R. (Eds.), Handbook of Statistics, vol. 6. Elsevier, Amsterdam, pp. 575–583] first introduced balanced sampling plans for the exclusion of contiguous units. Sampling plans that excluded the selection of contiguous units within a given sample, while maintaining a constant second-order inclusion probability for non-contiguous units, were investigated for finite populations of N units arranged in a circular, one-dimensional ordering. While significant advancements have been made in the identification and generalizations of such plans—commonly referred to as BSA sampling plans—little is known concerning the extension of such sampling plans to multi-dimensional populations. This paper will present a review of the pertinent results of one-dimensional BSA sampling plans and a discussion concerning the properties of two-dimensional BSA sampling plans.     

A bootstrap approximation to the joint distribution of sum and maximum of a stationary sequence

This paper establishes the asymptotic validity for the moving block bootstrap as an approximation to the joint distribution of the sum and the maximum of a stationary sequence. An application is made to statistical inference for a positive time series where an extreme value statistic and sample mean provide the maximum likelihood estimates for the model parameters. A simulation study illustrates small sample size behavior of the bootstrap approximation.     

分组密码算法的测试方法研究

安全性是分组密码最重要的设计准则。该文基于分组密码算法,分析了算法的多种安全性测试方法和测试理论,提出相应的测试统计量。采用AES算法中的一个8×8S盒,以一组长为1048576b的随机数为测试序列,进行实际安全性测试。测试结果表明测试统计量符合实际测试结果,从而验证所提出的测试统计量具有实际可行性,有力地保证了分组密码的安全性设计。     

国内外教育心理学教科书呈现方式比较及启示

虽然当前的教育心理学教科书多以其学术价值而存在,为学科发展作出了巨大贡献,但真正具有教科书体例特点和表达方式的教育心理学论著却非常缺乏。本文通过对作为教科书的教育心理学论著在板块设置及表达方式的改革等方面进行论述,以期对师范院校的准教师和中小学教师的专业发展有所裨益。