基于正交试验法的电流线圈架塑件工艺参数优化设计

为改善塑件的成型质量,采用正交试验法,选择注射时间、熔体温度、保压压力、保压时间以及冷却时间等5个工 艺参数作为控制因素。对各因素分别赋以4个水平,以塑件的翘曲量作为质量指标,建立正交试验表L16(45)。运用模 拟流动分析软件,对不同工艺条件下的塑件成型过程进行模拟分析,得到各翘曲值。对塑件翘曲产生的原因进行分析,分 析表明：保压时间和保压压力为影响塑件翘曲量最大的2个因素,通过改变这2个因素值可有效改善塑件的翘曲状况。     

CATANOVA for two-way cross classified categorical data

In this article we develop an extension of categorical analysis of variance for one response and two factors, based on a partitioning of a measure of predictability for three-way contingency tables, known as Gray and Williams's index. At the first instance moment the decomposition of this multiple measure of association in partial association measures is shown. Finally, for ordinal-scale variables, we propose an extension of this decomposition using a particular set of orthogonal polynomials.     

High-dimensional posterior consistency of the Bayesian lasso

ABSTRACT

This paper considers posterior consistency in the context of high-dimensional variable selection using the Bayesian lasso algorithm. In a frequentist setting, consistency is perhaps the most basic property that we expect any reasonable estimator to achieve. However, in a Bayesian setting, consistency is often ignored or taken for granted, especially in more complex hierarchical Bayesian models. In this paper, we have derived sufficient conditions for posterior consistency in the Bayesian lasso model with the orthogonal design, where the number of parameters grows with the sample size.     

Bayes least squares linear estimation of densities

Linear, least squares statistical methods in which the "parameters" are interpreted as random variables were introduced by Whittle, and further developed by Hartigan and others. They are applied here to the problem of estimating the coefficients in an orthogonal expansion of a multivariate density, given a simple random sample.     

MIMO雷达正交频分LFM信号设计及性能分析

多输入多输出(MIMO)雷达是最近提出的新的雷达技术,在发射端全向发射正交信号,在接收端对接收信号进行匹配滤波处理来恢复发射信号分量,因而信号的正交性好坏是MIMO雷达实现的关键。该文分析了正交频分线性调频(OFD-LFM)信号的互模糊函数,对互相关峰值旁瓣电平出现的位置及幅度大小进行了分析,给出了最小化OFD-LFM信号间互相关影响的参数之间的关系。通过对信号互相关的仿真结果及对目标回波信号匹配滤波的仿真结果,证明了理论分析的正确性。     

引信中应用的加速度传感器的研制

讨论了应用于引信中的高g微阵列式加速度传感器的设计理论、布阵方法和微加工工艺。讨论过程中,针对测量不同的加速度值,利用了不同的设计方法和加工工艺及二维传感阵列的布阵设计上的特点,将微加工中三维加工工艺与平面加工工艺相结合,利用体加工技术和高深宽比刻蚀技术,研制出了微阵列加速度传感器的样品。经测试表明符合使用要求,其结果为实用化奠定了基础。     

基于正交分析的双面组合连续箱梁剪力滞效应影响因素研究

考虑宽跨比、截面高度、翼缘板外伸长度、荷载类型等影响剪力滞效应的主要因素,采用正交分析方法对钢 混凝土双面组合连续箱梁进行试验设计,对设计工况进行数值仿真试验,并对计算结果进行正交分析。研究结果表明,荷载形式对双面组合箱梁剪力滞系数的影响最大,宽跨比的影响次之,而截面几何尺寸的因素如截面高度和翼缘板外伸长度在工程实用范围内的影响很小。通过统计回归,得到了弹性阶段钢 混凝土双面组合连续箱梁上翼缘有效宽度的无量纲计算公式。