正则有理Bezier曲线的等距曲线算法

通过利用改进的有理德卡斯特里奥算法求得正则有理ｎ次Ｂｅｚｉｅｒ曲线各点处的切矢,由此得到各点的单位法矢量,应用于求原始曲线的等距曲线,从而巧妙地解决了原始正则有理ｎ次Ｂｅｚｉｅｒ曲线上各点的单位法矢量难求的困难。该方法几何意义明显,算法简洁,实践效果比较好,最后本文给出了两个实例。     

嵌入CPU PCB结构测试方法研究

论述了嵌入CPU印制电路板（PCB）故障测试与故障诊断的一般方法。研究表明:只要满足一定的测试性设计要求,嵌入CPU PCB采用结构化测试方法是可行的。     

宽带噪声环境中FH-FDM/TDMA信号性能分析

新一代高跳速、大带宽通信系统将跳频通信与频分复用、时分多址技术相结合,不仅增加了通信系统容量,形成了灵活的多址方案,同时FH-FDM/TDMA信号具有抗干扰、低截获的能力。为此,在分析FH-FDM/TDMA信号机理的基础上,就同步环路机制进行了深入研究,重点对宽带噪声下的同步捕获环路的相关峰值、跟踪环路的跟踪误差、解调环路的误码率进行了推导;进一步对宽带噪声干扰下的跳频接收环路进行了仿真。结果表明,FH-FDM/TDMA信号具有更强的抗干扰性。     

Capacity games for partially complementary products under multivariate random demands

In this study, we consider n firms, each of which produces and sells a different product. The n firms face a common demand stream which requests all their products as a complete set. In addition to the common demand stream, each firm also faces a dedicated demand stream which requires only its own product. The common and dedicated demands are uncertain and follow a general, joint, continuous distribution. Before the demands are realized, each firm needs to determine its capacity or production quantity to maximize its own expected profit. We formulate the problem as a noncooperative game. The sales price per unit for the common demand could be higher or lower than the unit price for the dedicated demand, which affects the firm's inventory rationing policy. Hence, the outcome of the game varies. All of the prices are first assumed to be exogenous. We characterize Nash equilibrium(s) of the game. At the end of the article, we also provide some results for the endogenous pricing. © 2012 Wiley Periodicals, Inc. Naval Research Logistics, 59: 146–159, 2012     

高等教育产业化趋势剖析

分析了教育能否实现产业化以及教育产业化是否会导致教育不公平和丧失教育的公益性等问题。指出了高等教育产业化的必要性 ,并提出了如何规范和促进教育产业化发展的一些观点。     

面向新质作战装备的试验指挥控制体系结构开发

军事技术和武器装备的创新发展,使以新质作战武器装备为代表的新型作战力量脱颖而出.试验指挥控制体系结构的核心要素与描述模型,明确了体系结构开发的新质作战装备更加强调体系作战与联合试验场景,介绍了面向新质作战装备的模型顺序,并以激光武器为例说明了体系结构的构建过程.     

预制破片侵彻靶板临界跳飞角变化规律

为研究预制破片侵彻靶板的临界跳飞角变化规律,采用数值仿真的方法对预制破片侵彻靶板的临界跳飞角变化规律进行分析.利用LS-DYNA有限元仿真软件,建立了不同形状预制破片侵彻靶板的仿真模型,通过与试验结果相对比的方式验证了模型的可信性.分析了破片形状、破片形状比例系数、破片入射速度和靶板厚度对临界跳飞角的影响规律.分析结果表明:在相同条件下,破片临界跳飞角按照圆柱形、方形和球形预制破片的顺序依次减小,随着破片入射速度和破片形状比例系数的增大而增大,并在一定范围内随着靶板厚度的增加而减小.     

基于体系结构框架的精确保障体系构建研究

为适应现代战争精确保障呈现出的复杂体系特性,运用体系化的构建方法科学推动我军后勤转型.系统分析当前我军精确保障缺乏顶层性、系统化的不足及体系结构框架技术发展现状,提出了利用体系结构框架技术提供体系构建的科学方法思路.在全面分析利用体系结构框架技术构建精确保障体系,在方法维、表现维、逻辑维、数据维4个层面的机理适用性的基础上,完成体系可行性构建及动态执行验证分析.最后提出了未来我军针对精确保障体系的体系结构构建研究,应在微观要素关系、中观系统层次联系以及宏观体系演进发展等方面继续展开.     

Research progress on advanced rail materials for electromagnetic railgun technology

Electromagnetic railgun attracts more and more attention due to its advantage in speed,cost,and obscurity.It is found that the rail should withstand huge mechanical and thermal shocks during the launching operation.The forms of rail failure are accompanied by gouge,grooving,transition,and arc ablation,etc.The service life of the rail has become a bottleneck restricting the development of elec-tromagnetic railgun technology.A series of researches are carried out to solve rail failure,including analysing the failure mechanism and using various advanced rail materials.This paper provides a comprehensive review of rail materials,including material composition,preparation,microstructure,and properties.We begin from a short background of the requirement of the rail material.Then a detailed investigation of rail materials is described,and the performances of those materials are introduced.Finally,further development prospect of rail material is discussed.     

基于眼球定位和头盔定位的综合视线跟踪技术

人在搜索目标的过程中,头动和眼动的耦合随动关系类似于光电稳瞄稳像技术中的二级稳定,头部运动完成概略观察方向稳定对准,眼球运动完成对目标的精细稳定对准.提出的基于眼球定位和头盔定位的综合视线跟踪技术,利用头盔定位得到头盔瞄准线相对飞机轴线的方位和俯仰角,以及眼球定位得到视线相对瞄准线的方位和俯仰角,将两者叠加,得到视线相...