无源雷达GPS卫星信号模糊函数研究

研究了GPS卫星信号作为照射信号的双基无源雷达信号模糊函数性能,论述了雷达系统结构和信号模型,分析了GPS信号的模糊函数特性,给出了计算机仿真。理论分析和仿真结果表明,GPS信号作为无源雷达照射源具有良好的目标分辨力。     

武器系统模糊寿命周期费用模型

武器系统的寿命周期费用建模较多采用参数法,而参数法中最常用的是最小二乘回归.考虑费用统计数据的模糊性,提出用模糊最小二乘回归来建立武器系统模糊寿命周期费用模型,并结合实例对武器系统寿命周期费用进行了分析.结果表明,这种方法能达到令人满意的拟合精度,具有实用价值.     

基于小样本数据的作战计划生成方法

针对部队实兵对抗实验数据生成和采集的投入高、难度大的实际,提出基于小样本数据生成作战计划的方法：首先,采用偏最小二乘回归分析法建立作战因素与作战结果间的多元非线性模型;其次,采用改进的遗传算法,在MATLAB平台编程实现了对模型的整数规划求解,并通过实例验证算法的有效性;最后,利用作战因素的重要性排序分析作战计划的调整流程。     

英语歧义的理解与修辞功能

基于英语学习者有时候为歧义所困 ,从语义学和语用学的角度讨论了英语歧义的分类、理解和修辞功能 ;通过实例进行研究和分析 ,指出了影响歧义理解的主要因素并提出了相关对策 ;介绍了歧义的积极作用 .     

“逻辑学”与“独立思考”——俊杰、小弟、豹死、金花、树叶

逻辑思考方法与科学求真精神是现代社会的物质建设和精神建设的前提。逻辑学可以澄清日常用语的歧解 ,并有责任和可能对各种语言的用法进行“理智的重建”。可以通过对一些智力趣题的逻辑解决方法和演示来进行思维训练。但这些不同的训练方法也大有讨论、批评的余地     

闭式循环柴油机技术综述

基于采用海水吸收的闭式循环柴油机系统,综合分析了系统实现的一般原则和目前的技术状况,并提出了系统实现中存在的问题及其解决的思路．     

System availability in a gamma alternating renewal process

We measure the effectiveness of a repairable system by the proportion of time the system is on, where on-time and off-times are assumed independent and both gamma-distributed. This measure is helpful for system planning and control in the short term, before the steady-state is reached, and its mean value is intermediary between instantaneous and steady-state availabilities. We also present other significant results concerning the Gamma Alternating Renewal Process. © 1999 John Wiley & Sons, Inc. Naval Research Logistics 46: 822–844, 1999     

Determining a threshold control policy for an imperfect production system with rework jobs

Consider a threshold control policy for an imperfect production system with only a work center handling both regular and rework jobs. An imperfect production system studied here, generates defect jobs by factors other than machine failures. A threshold control or (ω, s) policy sets the guideline for a work center to switch between regular and rework jobs. A production cycle begins with loading and processing of several batches of regular jobs with a lot size equal to s. The outcome of each completed regular job is an independent Bernoulli trial with three possibilities: good, rework, or scrap. Once the work center accumulates more than a threshold ω of rework jobs, it finishes the last batch of regular jobs and switches to rework jobs. The objective of this research is to find a threshold ω and a lot size s that maximize the average long‐term profit. The ultimate goal is to construct a simple algorithm to search for ω and s that can be implemented directly in production management systems, as a result of this work. © 1999 John Wiley & Sons, Inc. Naval Research Logistics 46: 273–301, 1999     

一种用浮点除实现整除的方法

本文提出一种用浮点除法来实现整数除法的方法。对这种方法可能带来的误差进行估计井给出了商的修正方法。最后研究一个实例并对该方法进行了评价。     

SG高压水室在典型循环工况下的低周疲劳评估

本文应用有限元分析了ＳＧ高压水室在典型负荷波动下的热应力,根据所计算出的峰值应力循环幅,引用低周疲劳设计曲线,对结构的低周疲劳用ＡＳＭＥ规范进行了评估,发现ＳＧ在典型载荷循环下不产生显著的低周疲劳损伤。