分布式系统中基于复制的动态容错模型

基于C/S模型的分布式应用系统中,服务器上服务进程的失效往往会导致系统崩溃或系统性能的下降。文章从提高分布式系统软件容错能力的角度出发,提出一种基于复制的动态容错模型。采用进程复制技术,将复制的服务进程分布到不同主机运行,复制进程通过与主服务进程共享消息缓冲队列,动态地保持运行轨迹一致,当主服务进程失效后,从复制的进程中选取一个作为主服务进程,使系统继续运行。     

汉英翻译系统英文生成中选词模型的设计

本文描述了一种基于实例比较,辅以语义模式匹配的英文选词模型的设计。首先,我们讨论了汉英翻译系统英文生成中选词的重要性,然后比较了几种可能的选词策略并提出我们的选词模型,接着我们较详细地描述了生成词典的结构以及选词算法。文中,我们还简要介绍了我们所使用的语义知识资源——《知网》。     

个人信息交换语法(PKCSl2)结构分析

个人信息交换语法(PKCS12)在信息安全领域得到了广泛的应用,了解PKCS12的数据结构及其实现将有助于我们了解如何实现对CA证书中各种信息(包括私有信息)的保护,从而使数字证书的随身携带成为可能.     

一种计算机网络病毒传播数学模型

研究计算机病毒在网络上进行传播的数学模型,可以深刻理解病毒扩散对网络造成危害的现象,为反病毒技术研究提供理论基础.本文通过在典型网络环境下病毒传播数学模型的建立和分析,得出了遏制网络病毒迅速扩散的重要环节和策略.     

Alternative resist adhesion and electroplating layers for LIGA process

 The fabrication of high aspect ratio microstructures using the X-ray lithography and electroplating step of the LIGA process requires, that the metal layer on the substrate (plating base) enables a flawless resist adhesion and provides a high conductivity for the following electroplating process. In addition, a flawless metal adhesion after electroplating has to be ensured. Typically metal layers of titanium, but also of copper and gold are used. In case of higher structures, fluorescence radiation generated in the metal layer during exposure reduces the bond strength between the resist and the adhesion layer [7]. Since the fluorescence probability decreases with a decreasing atomic number, the suitability of conductive carbon as the plating base was investigated and compared to results achieved with titanium. The resist adhesion was increased tremendously on the carbon layer but the metal adhesion is insufficient. Therefore, platinum islands were deposited on the conductive carbon to facilitate good metal adhesion. The resulting resist adhesion was still superior compared to titanium. In addition, metal adhesion was achieved on these layers.     

软测量技术及其在抄纸过程中的应用

介绍了软测量技术常用的建模方法,分析了优缺在。采用静态线性软测量模型的回归分析法,实现对纸张水分的软测量。模型参数的辨识采用最小二乘法及对病态方程仍稳定的Ｈｏｕｓｅｈｏｌｄｅｒ变换法。然后给出了软测量模型的在线校正方法。     

Re-engineering of the design process for concurrent engineering

According to the requirements of concurrent engineering, three interdependency relationships (uncoupled relationship, coupled relationship and decoupled relationship) between design activities are presented in this paper. And the coupled relationship plays an important role in concurrent product design process. To represent the precedence relationships among design activities, a directed graph is used to describe the design process. And the interdependency relationship between activities is illustrated by a Design Structure Matrix which is the transpose of the accessibility matrix of the corresponding graph. Using the DSM, an algorithm of recognizing the coupled activities during the design process is presented. Moreover, an algorithm to figure out the order levels of activities during the design process is proposed. And both algorithms are illustrated with a die design example.     

热轧实施计划中最优倒垛问题的整数规划模型及遗传算法

对钢铁企业板坯库中的最优倒垛问题建立了0和1整数规划模型.这一模型是一个 二次规划模型,且目标函数的系数与变量的取值相关联,属于NP-难问题,获得较大规模的最 优解是不可能或非常困难.为了求解此问题,本文构造了改进遗传算法:(1)提出了适合于最 优倒垛问题的遗传编码,运用此编码,不但能够产生可行的初始染色体,而且能够保证在交叉 和变异操作后的染色体仍然可行;(2)改进了遗传算法结构,在新的结构中,增加了一个培育 操作,改进了交叉操作.通过精选随机产生的问题例子的实验显示出,提出的算法的性能明显 好于原系统的启发式算法,最好的改进率达到7.04％.     

一种成象跟踪系统的设计

在分析了国内外成象跟踪系统存在的优缺点的基础上,提出了一种新的成象系统的设计方案,并完成了实验系统报调试。系统中采用的跟踪算法能够很好地解决三维空间中物体一拉移旋转和尺度不变性问题,这是过去许多跟踪算法中没有解决的问题。在硬件设计中采用了高速数字信号２芯片ＴＭＳ３２０Ｃ３０来协助完成图象处理任务以满足实时跟踪的需要。     

HLA联邦开发执行过程及发展趋势

对高层体系结构（HLA）的组成、最新发展的联邦开发执行过程（FEDEP）和支撑软件进行了详细的介绍,给出了联邦开发执行过程的发展趋势,并对我国开展这方面的研究提出了方向和目标。