Optimal balanced block designs for correlated observations

The construction of universally optimal designs, if such exist, is difficult to obtain, especially when there are some nuisance effects or correlated errors. The hub correlation is a special correlation structure with applications to experiments in genetics, networks and other areas in industry and agriculture. There may be restrictions on the correlation values of the hub structure depending on the experiment. Optimality of block designs under hub correlation has been studied for the case of a constant correlation value. In this article, we consider the hub structure when one of the correlation values is different from the others, and the universally optimal block designs, binary or non-binary, are theoretically obtained. Also, we introduce an algorithm to construct the optimal designs. The Canadian Journal of Statistics 48: 596–604; 2020 © 2020 Statistical Society of Canada     

一种八单元圆环阵实现多波束的方法

给出了一种用改进的Butler八单元圆环阵实现固定多波束天线阵的方法。天线阵由八个垂直地面放置的半波振子组成,通过改变馈电端口来控制波束的指向。由于添加了八个额外的移相器,可产生八个并行波束实现对水平面的完全覆盖,并可用于信号到达角的粗略估计。     

标注关键词的逻辑要求

普通高等学校学报刊发学术论文标注关键词,不论采取何种形式,也不论其内容和性质有何不同,都要符合其逻辑要求.这包括标注的关键词必须是同一系列和序列的;它必须是主题概念的子类概念或分子概念;关键词外延之间必须具有并列关系或矛盾关系.     

组建非线性编辑网络技术的简析与探讨

近年来非线性编辑网络系统在国内县级电视台开始应用,随之而来的是网络的选型问题。通过对网络组建过程中遇到的问题进行分析,总结了组建非线性编辑网络需要注意的各个环节,并作了简要介绍。     

SOME SECOND ORDER ASYMPTOTICS IN NONLINEAR REGRESSION

Some asymptotics related to statistical curvature are studied from a geometric point of view. The method of stochastic expansion is used to study the second order information loss and some conditional inference for the least squares estimator in nonlinear regression in which the samples are independent but not necessarily identically distributed.     

大尺度球形光学列阵的成像理论

利用衍射理论,在高阶近似下计算了大尺度球形光学列阵和平面光学列阵的综合成像特性,给出了成像条件和成像公式,并与傍轴近似下的理论结果作了比较。最后用计算机绘制了列阵成像系统中各观察面上的场强分布。     

BALANCED ARRAYS AND WEIGHING DESIGNS

Dey (19711, Saha (1975), Kageyama & Saha (1983) and others have shown how optimum chemical balance weighing designs can be constructed from the incidence matrices of balanced incomplete block (BIB) designs. In this paper, it is shown that weighing designs can be constructed from some suitably chosen two-symbol balanced arrays of strength two, which need not always be incidence matrices of BIB designs. The findings lead us to construct new optimum chemical balance weighing designs from incidence matrices of BIB designs.     

自适应多波束形成的算法

论述了一种窄带和宽带多波束形成的算法,这种算法所依据的准则是在波束满足指向和振幅要求的约束条件下使阵列输出功率最小。对于 N 元阵列,可同时形成 N-1个独立波束。根据对约束条件的不同控制,利用这种算法可实现波束扫描,形成宽波束、实现干扰对消或旁瓣对消等。同时还给出了所述算法的计算机模拟结果,结果表明所述算法是很有效的。     

C/C 程序设计中指针的运用

面向过程的C语言和面向对象的C 语言中都引入了指针的概念。指针是C/C 中特性较强、功能较好的应用之一。然而指针也是C/C 中最不容易理解和掌握的概念。本文针对C/C 中的指针原理及使用方法做了较为系统的论述,并对其应用进行了系统的归类,对每一种应用都用实例加以阐述,为学习C/C 指针的相关知识提供了快捷有效的方法。     

基于FPGA的模拟信号源系统设计

提出了一种基于现场可编程门阵列(FPGA)的全球定位系统(GPS)卫星信号模拟源系统的设计方案。FPGA作为一种常用的可编程器件,将其应用到模拟信号源系统中,并配合射频模块,实现了多个频点的程序控制,产生出大量具有高稳定度和准确度的不同频率的GPS卫星信号,减少了多个频点的开发周期,降低了风险。