基于GPIB的电源测试系统

介绍了基于GPIB总线技术的电源测试系统;详细介绍了系统的硬件组成;详细介绍了软件的用户界面及功用。     

异构数据集成技术的发展和现状

该文对异构数据集成技术的产生、发展及目前的最新情况进行了介绍。文章首先介绍了这一技术产生的背景和研究目的。然后介绍了相关的概念、技术及开发工具。随后对现有的异构数据集成系统进行了简单的介绍,并对其中很有代表性的Lore系统进行了着重介绍。在文章的最后,介绍了笔者所做的研究工作和下一步的工作目标。     

实时监控系统中的新技术--OPC标准

简要介绍了实时监控系统中的一种新技术-OPC标准，介绍了该标准产生的背景及优点，对OPC接口的结构体系进行了简要介绍，详细介绍了OPC数据访问自动化接口，给出了VB程序连接OPC服务器的详细代码。     

基于WebServices的基建项目管理系统的研究与实现

本文首先介绍了软件系统的开发背景和预期要达到的目标,然后在系统的体系结构上进行了简单的分析,在使用的关键技术进行了简单的介绍,对系统在系统安全方面进行了详细的介绍,最后介绍了整个软件系统的特点.     

异构数据库中的数据类型转换

简要介绍了异构数据库系统的基本概念以及对异构数据库数据类型转换的需求分析;重点介绍了异构数据库数据类型转换所面临的主要技术问题及解决方案;并介绍了XML在异构数据库系统中的应用;最后,简要介绍了异构数据库系统的应用领域及展望。     

利用xml语言创建简单留言的C#程序设计

介绍了XML的主要特点。介绍了利用XML特点创建简单留言的c#程序设计,通过实例重点介绍了其设计方法及应用情况。     

基于BEOWULF的PC集群系统设计及并行编程的研究

介绍了机群的概念,重点介绍了Beowulf集群。在此基础上,构建了BeowulfPC集群,并详细介绍其软硬件的配置.最后,通过对MPI的介绍,结合实例,对系统进行了性能评测。此系统已运用于实际工作中,取得了良好的效果。     

浅谈嵌入式Internet技术的未来发展

本文主要论述了嵌入式Internet技术未来发展,首先介绍了什么是嵌入式Internet,其次介绍了嵌入式系统发展趋势,最后介绍了嵌入式Internet技术未来的应用领域。     

关于80X86保护模式下任务切换的实现

首先简要介绍了 80X86保护模式的特点 ,然后介绍了该模式下相关的数据结构和任务切换的途径 ,最后介绍了任务切换的实现过程     

永中Office办公套件维文版的设计--多语言混合排版的设计

简要介绍了维吾尔文字的特点,并介绍了JDK国际化API,最后介绍了永中Office办 公套件维文版的设计,描述了其中多语言混合排版的设计。     

卫星伪距定位精度模拟评估软件设计

基于研发人员进行嵌入式导航型用户设备的研究工作中,需要全面考虑各种因素对定位精度的影响,研究提高用户设备定位精度的方法。本文提出设计卫星伪距定位精度评估软件的方法,该软件具有对影响伪距定位精度的多种算法进行评估功能,还具有选取用户机软硬件设备、研究选星方法等功能,为研发人员提高伪距定位精度提供了一种有效的手段。     

How practice produces suboptimal heuristics that render backup instruments ineffective

The operation of machines typically requires attention to instruments that signal the state of the machine. One safeguard against primary instrument malfunction is to provide backup instruments, but this works only if the operators react to malfunction by switching attention to the backups. Little is known about the effect of negative outcomes or feedback on allocation of attention to backup instruments. Four experiments demonstrated that prior practice causes operators of a simulated machine to adapt to instrument malfunction by changing to a suboptimal decision rule rather than by reallocating attention to a different set of instruments. This fallacy appears linked to the operators' failures to notice feedback that they should switch during the simulations and operators' failures to correctly interpret outcome feedback following the simulations. The results raise theoretical questions and warn interface designers not to overrate backup instruments.     

How practice produces suboptimal heuristics that render backup instruments ineffective

The operation of machines typically requires attention to instruments that signal the state of the machine. One safeguard against primary instrument malfunction is to provide backup instruments, but this works only if the operators react to malfunction by switching attention to the backups. Little is known about the effect of negative outcomes or feedback on allocation of attention to backup instruments. Four experiments demonstrated that prior practice causes operators of a simulated machine to adapt to instrument malfunction by changing to a suboptimal decision rule rather than by reallocating attention to a different set of instruments. This fallacy appears linked to the operators' failures to notice feedback that they should switch during the simulations and operators' failures to correctly interpret outcome feedback following the simulations. The results raise theoretical questions and warn interface designers not to overrate backup instruments.     

集群负载均衡--CSM的实现

对于现在的互联网络通信状况,负载均衡显示其越来越多的重要性,通常实现负载均衡是使用软件并结合相应的算法,该文所描述的是利用Cisco公司的CSM模块来实现安全可靠的负载均衡,CSM模块将客户机的请求分发到不同的虚拟服务器,配合Cisco MSFC模块并合理地进行DNS的配置,实现网络服务的负载均衡。简要介绍了CSM模块的工作原理,如何配置DNS,如何设置虚拟主服务器,以及如何对系统CSM模块进行设置做了描述。     

关于多变量PID自适应解耦控制器的设计

本文对于多变量自适应解耦控制与PID控制相组合．这一工业过程控制的重要设计方法，主要是对一些控制算法和全局收敛性分析等问题，进行了研究和探索。     

Retinal adaptation to non-uniform fields: average luminance or symbol luminance?

Various lighting and video display terminal design recommendations have been based on the assumption that the eye adapts to the average luminance of the field being viewed. Other evidence suggests that for irregular patterns the eye adapts to a level biased toward the peak luminance in the field being viewed. Subjects in this study adapted to uniform fields of varying average luminance and to two test patterns, one of which (dots) had a peak luminance equal to the brightest uniform field and an average luminance equal to the least bright uniform field. Time, to respond to a test pattern following adaptation to dots was intermediate between the two extreme uniform fields, but closer to that of the brighter field which had an average luminance equal to the test pattern's peak luminance. For that reason, proposed lighting differences based on image polarity or recommendations of positive image polarity do not appear to be warranted.     

多根贯通导线对屏蔽体内电路电磁干扰影响的仿真研究

仿真研究了两根贯通导线对屏蔽体内印制电路板终端负载的影响。研究表明,贯通导线与屏蔽体外的电磁脉冲波耦合,可使传入屏蔽体内印制电路板终端负载上的电压增大很多;当双线连接时,不仅存在着空间辐射干扰波通过导线吸收传导进入电路而产生的干扰电压,而且还存在着两线间串扰电压。实验结果可知,随着频率的增加,线间串扰增大,在终端负载产生的总干扰电压,比只有通过线吸收传导进入电路产生的电压要大。这些工作对电子系统的设计和安装具有指导意义。     

浅析边远地区政府信息化的发展

电子政务是指政府机构运用现代网络通讯与计算机技术,将政府管理和服务职能通过精简、优化、整合、重组后在互联网上实现,以打破时间、空间以及条块分割的制约,从而加强对政府业务运作的有效监管,提高政府的运作效率,并为社会公众提供高效、优质、廉洁的一体化管理和服务。电子政务强调政府业务通过电子化手段运作及其实现过程,而电子政府则是通过电子化手段来运作政府业务特征的政府形态的描述。本文以位于内蒙古最西部的兴安盟为例,对边远地区发展政府信息化的重要性、现状、存在的问题和困难以及今后的发展提出了阐述。     

Design, fabrication, and testing of silicon microgimbals forsuper-compact rigid disk drives

This paper documents results related to design optimization, fabrication process refinement, and micron-level static/dynamic testing of silicon micromachined microgimbals that have applications in super-compact computer disk drives as well as many other engineering applications of microstructures and microactuators requiring significant out-of-plane motions. The objective of the optimization effort is to increase the in-plane to out-of-plane stiffness ratio in order to maximize compliance and servo bandwidth and to increase the displacement to strain ratio to maximize the shock resistance of the microgimbals, while that of the process modification effort is to simplify in order to reduce manufacturing cost. The testing effort is to characterize both the static and dynamic performance using precision instrumentation in order to compare various prototype designs     

Strategies for adding features to CAD models in order to optimize performance

This paper presents an approach which enables new parameters to be added to a CAD model for optimization purposes. It aims to remove a common roadblock to CAD based optimization, where the parameterization of the model does not offer the shape sufficient flexibility for a truly optimized shape to be created. A technique has been developed which uses adjoint based sensitivity maps to predict the sensitivity of performance to the addition to a model of four different feature types, allowing the feature providing the greatest benefit to be selected. The optimum position to add the feature is also discussed. It is anticipated that the approach could be used to iteratively add features to a model, providing greater flexibility to the shape of the model, and allowing the newly-added parameters to be used as design variables in a subsequent shape optimization.