基于虚拟仪器的导弹自动驾驶仪测试系统设计

针对某型号导弹自动驾驶仪故障检测和诊断难题,在分析自动驾驶仪功能和特性基础上,基于虚拟仪器技术设计开发了自动测试硬件平台;测试系统软件完成敏感元件、指令等激励信号的模拟,对自动驾驶仪输出信号采集、处理和分析,并对测试结果进行判定,最后给出故障定位;通过对自动驾驶仪故障件的测试和验证,自动测试系统工作高效、稳定,为该型号导弹自动驾驶仪的故障测试和诊断提供了高效的方法和手段。     

一种通用自动测试系统自检子系统的设计与实现

针对某型PXI总线通用自动测试系统的测试资源较多、传统人工检测效率低、时间长、强度大且易出错的难题,提出了一种基于仪器自检、重要关键仪器测试、灵活运用开关及多路复用器的自检方案.利用RCV与ITA接口设计研制了自检适配器;采用虚拟仪器技术设计开发了自检子系统测试程序.测试验证结果表明,该自检子系统实现了对通用自动测试系统的快速、准确的自检测试功能,为快速定位故障模块提供了检测手段.     

一种便携式多通道ARINC429总线信号检测装置的研制

为满足对航空机载设备多通道ARINC429总线现场检测的需要,以FPGA为主处理器,以CPLD为协处理器,以HS-3282/3182为ARINC429总线协议芯片,以触摸屏作为人机接口,设计了一种便携式多通道ARINC429总线检测装置.给出该装置的内部结构框图、各模块硬件电路设计及其软件流程框图,并开发出该装置触摸屏的测试软件.最后针对机载电路板件,对装置功能进行测试验证.测试结果表明,本装置操作简便,性能稳定可靠,可应用于带有ARINC429总线信号收发功能的机载电路板件的维修测试中.     

基于虚拟仪器的PHS自动测试系统设计

设计并实现了基于虚拟仪器的PHS手机自动化测试系统;该系统采用基于PXI总线的在线测试技术、基于Web Service的分布式测试技术、基于Visual Studio.Net的集成化测试技术、基于统计过程控制和数据挖掘的智能化测试技术,完成了PHS手机生产线上的关键测试工位和测试项目的自动化测试,实现了与生产管理系统的企业应用集成和远程维护功能,提出了基于虚拟仪器的自动化测试方案,给出了自动化测试系统功能模块和进一步扩展的系统框架,满足了PHS手机大规模量产的需要.     

一种飞机电路板自动测试系统的研制

针对近年来飞机电路板维修保障难度日益增加的现状,为掌握电路板的修理能力,迫切需要更多的测试手段来满足日趋复杂的电路板测试需求.在对自动测试系统进行阐述的基础上,以PXI、VXI总线仪器为资源核心,设计了一种可提供大量电路板级测试资源的自动测试系统硬件平台,给出该系统的组成图,并基于C语言开发一套自动测试软件,给出软件测试流程框图与功能验证结果,结果表明所研制的测试系统可实现机载电路板的快速开发测试.     

基于LabVIEW的机械传动性能测试系统

机械传动性能实验台是一种用于各类机械装置传动系统性能测试的实验设备,传统的实验台基于二次仪表测试技术存在不足.为改善测试的功能,基于LabVIEW软件平台和NI公司的相应硬件,构建了一种基于虚拟仪器的自动测试系统和测试方法,用来测试减速器在不同工况下的传动效率及振动、噪声等,实测证明构建的系统正确、使用的技术方法可行.     

基于80C486处理器的多功能实验板的设计与实现

针对近年来飞机含80C486处理器电路板修理现状,为掌握该系列板件的修理保障能力,迫切需要开展其软硬件测试技术研究.在对80C486处理器进行系统阐述基础上,设计并研制一块基于80C486处理器的多功能实验板,给出该板的硬件电路图与软件流程框图,并基于汇编语言进行功能调试,实验结果表明其有效性.所做的含80C486处理器的正向设计与软件编程研究工作为修理含80C486控制器板的机载模块奠定了基础,同时也为后续含有该型控制器的板件测试和修理提供了借鉴方法,并对同类型其他控制器的测试提供参考.     

基于PXI总线的导弹自动测试系统设计

导弹系统的研制过程需要模拟导弹的真实工作条件,对弹上各控制部件进行实时监测,因此提出一种基于PXI总线与虚拟仪器技术的导弹通用自动测试系统;论述了该测试系统的总体方案,系统的硬件配置和软件设计;重点阐述了使用虚拟仪器技术作为软件开发平台,实现弹上多路多种相关信号并行采集、实时显示、处理分析和数据回放功能,并针对不同型号的导弹形成测试程序集;现已成功应用于多型导弹的自动测试,为准确定位导弹故障提供了有效的解决途径,极大提高了导弹测试系统的快捷性、准确性和通用性。     

基于虚拟仪器技术的故障诊断专家系统的实现

随着计算机技术的发展,智能技术在测试领域显得越来越重要,在传统的测试系统中使用专家系统技术成为测试系统的发展趋势;文章通过对专家系统原理的介绍,提出了将专家系统技术引入测试领域的可行性,并分别介绍了基于虚拟仪器的测试系统软件设计方法和基于规则的专家系统软件设计方法,并给出了故障诊断专家系统的实现方法和实时故障专家系统的设计方案;经使用后,认为专家系统技术将有助于智能化故障诊断的实现,并且可提高测试技术的智能化程度。     

基于SE故障特征提取的虚拟仿真系统研究

虚拟仪器是一种新的仪器技术,是对传统仪器的重大变革,它集成软硬件结合的技术进行实时、在线测量,并将电子测试技术与故障诊断结合起来,这是故障诊断、检测、识别技术与测试技术相结合发展的重要趋势.介绍了虚拟仪器仿真技术的特点和构成,将现代信号处理新理论谱熵(spectral Entropy,简称SE)引入到虚拟仿真的信号分析之中,对传动系统的故障进行了特征提取,对不同类型的故障进行了聚类分析,并对系统的运行状态进行了预测,以VC++软件开发平台为基础,并结合MATLAB语言研制和开发出了机械故障诊断虚拟仿真系统,设计了各种功能模块,包括振动信号的采集、分析、处理和系统故障的特征提取、聚类和诊断等.从而实现了故障诊断虚拟仿真系统应有的功能.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。