分布式计算机网络数据加密研究

针对C~3I 系统对分布式计算机网络数据加密的特定需求,重点对网络加密方式,密码装置、软件编程设计等核心问题进行了研究。可对数据加密总体设计与软件概要设计提供参考。     

CAI课件开发中的数据库应用

本文在分析CAI课件开发中测试部分设计难点的基础上,结合实例阐述了使用多媒体课件制作工具Authorware开发CAI课件时,如何通过ODBC数据库接口和SQL语言,以外部数据库作为数据源,实现不同章节抽取测试题的方法。     

An economic selective assembly procedure for two mating components with equal variance

An economic procedure of selective assembly is proposed when a product is composed of two mating components. The major quality characteristic of the product is the clearance between the two components. The components are divided into several classes prior to assembly. The component characteristics are assumed to be independently and normally distributed with equal variance. The procedure is designed so that the proportions of both components in their corresponding classes are the same. A cost model is developed based on a quadratic loss function and methods of obtaining the optimal class limits as well as the optimal number of classes are provided. Formulas for obtaining the proportion of rejection and the unavailability of mating components are also provided. The proposed model is compared with the equal width and the equal area partitioning methods using a numerical example. © 1999 John Wiley & Sons, Inc. Naval Research Logistics 46: 809–821, 1999     

余模范畴上单子的构造

根据A-上环（A是代数）的类群元的定义及有关性质，文章首先给出T-余单子（T是单子）的类群元的定义、存在条件，其次研究了类群元与缠绕结构之间的相关性质，最后构造了T-余模范畴上的单子。     

矩阵开关技术在通用ATS电源模块自检中的应用

针对通用ATS中电源模块检查过程中存在检查时间长、劳动量大、工作效率低且易出错等问题，将矩阵开关技术引入通用ATS中电源模块的自检过程中，选取电压信号的均值和均方差作为评价电源模块性能的特征参数，并利用矩阵开关的多路复用功能设计了电源模块自检的拓扑结构，实现了自检过程中多通道的自动配置。仿真验证试验说明了该方法具有多通道自动配置、自检时间短、故障定位准确等优点。     

有线数据通信仿真模块的设计与实现

针对某通信系统中的有线通信模块,采用半实物仿真技术对其进行仿真,论述了基于DSP和USB技术的设计,详细地描述了系统各部分的构成及工作原理,其调制部分通过按位分析数据并控制8253输出不同频率的方波实现;解调部分通过AD采样并由DSP对数据进行信号处理而实现.同时给出硬件接口设计思路和原理图,最后介绍相关软件基本框架.     

基于零点匹配的弹体构件超声检测方法

针对弹体坯料构件检测效率较低的问题,提出了一种基于零点匹配的超声检测原理。零点匹配原理是基于被检构件在做周期性的匀速旋转过程中自身曲率变化的规律提出的,表现为探头与构件下表面的距离变化。利用小波分析的方法对含有噪声的周期距离信号进行降噪处理,并采用求不同检测截面间周期信号的互相关函数的方法,对各截面零点进行一致性判断,根据判断结果进行零点匹配。该方法有效缩短了零点传感器进行零点判断过程所需的等待时间,有效提高了构件检测的效率。     

基于AT89C51和DS18B20温度的测量系统的实现

本系统为以AT89C51单片机作为主控芯片的温度测量系统，采用一线温度传感器DS18820实现温度的检测，结合128×64点阵式液晶显示模块OCM12864作为显示器，形象直观地显示测得的温度值。主要介绍了该系统的硬件结构和软件编程实现的方法，数字温度传感器DS18820的基本特性，阐述了DDRAM寻址与液晶点阵的对应关系及中文字符、中文菜单在液晶模块上的显示规则。     

登月舱制动段最优机动中的状态跟踪

本文根据登月舱的运动方程,在固定推力条件下,给出最优推力方向。在最优推力方向上对摄动方程加入自适应调节控制,得到状态跟踪的稳定性,使受控系统的输出跟踪状态精度得到保证。     

The impact of defense and non‐defense public spending on growth in Asia and Latin America∗

For a three‐sector Feder‐Ram framework, we present time‐series, cross‐sectional estimates for two cohorts, consisting of Asian and Latin American countries. The estimates indicate that private investment, and defense and non‐defense public spending are growth promoting for alternative error components representations. For the best error components representation, greater growth enhancement is associated with the two forms of public spending in Asia than in Latin America, while the opposite comparison characterizes private investment. Although defense is growth promoting, an opportunity cost exists insofar as non‐defense spending, financed by defense spending, appears to give a small net boost to growth in Latin America.