航天器热试验电源健康管理系统的设计与实现

航天器热试验对程控电源的数量需求规模较大,电源以机柜阵列形式进行配置,其运行状态的稳定性将直接影响试验的安全性与可靠性。本文对热试验用程控电源的健康管理技术进行研究,以Agilent N5750型电源为研究对象,基于程控电源历史故障类型分析,对程控电源故障检测技术进行研究,并结合电源冗余切换技术,设计电源在线切换装置。通过试验验证,该系统能够快速实现在用电源的故障检测定位,并能够在秒级时间内完成故障电源向备用电源的在线切换,系统全部工作周期小于3s,实现了控温系统大规模电源阵列的智能健康管理,提高了航天器热试验控温系统的运行可靠性。     

高性能计算机电源系统设计的关键技术

本文讨论了高性能计算机电源系统设计的三个关键问题--确定电源架构、选择DC/DC电源和进一步提高电源系统的可靠性.本文作者根据实际工程设计经验,总结出解决这些问题的技术方案和方法.     

基于Iabview的监测系统设计与实现

此文仔细分析了某电源系统的监测需求,采用labview开发环境,结合VC 和数据库技术,系统设计并实现了该电源监测系统     

基于labview的监测系统设计与实现

此文仔细分析了某电源系统的监测需求,采用labview开发环境,结合VC++和数据库技术,系统设计并实现了该电源监测系统     

智能电源系统在信号领域中的应用

随着轨道交通的发展,信号设备要求具备智能化、模块化、自动化、网络化的智能电源系统。针对信号系统的发展对智能电源系统的要求,阐述了智能电源系统在智能化、模块化、自动化三方面的应用。介绍了目前智能电源系统所采用各种不同的技术方案,并论述了方案的优缺点,总结了目前存在的问题和发展方向。     

某型飞机电源故障诊断专家系统设计与实现

为了准确、快速地对飞机电源系统故障进行诊断和排除,在分析某型飞机电源系统的失效模式和故障机理的基础上,建立故障树,采用基于规则的故障树分析技术对故障模型进行分析,引入正向推理和反向推理两种推理机制,研究了基于数据库技术的知识库的构建方法,设计某型飞机电源故障诊断专家系统。结果表明,该故障诊断系统的推理结果符合实际情况,提高了飞机电源系统故障诊断的智能化水平。     

商业自动化系统中的电源问题(下)

(接上期) 安全技术防范系统的电源 商业自动化系统中也有许多安全技术防范系统,例如闭路电视监控系统、商品防盗系统、防盗报警系统、紧急广播系统、消防系统、门禁系统与考勤系统等.这些系统的电源问题实际上还未引起足够的重视.这些系统往往是在关键的时候起作用,而电源的故障可能会产生难以预料的后果.安全技术防范系统过去一般是做工程时临时用标准电源拼凑,有相当比例系统故障的原因就是电源造成的.     

智能型DCS控制电源的研究与应用

在我国工业快速发展的过程中,智能化科技也获得了普遍的应用,其中集散控制系统（DCS）的应用最为广泛。该系统的核心之一在于电源的应用,从传统的开关电源到冗余电源技术再到如今的智能型电源,都对DCS系统有着巨大推进作用。文章将主要针对智能型DCS控制电源进行研究与应用,论述DCS控制系统及其电源的发展,并介绍其应用实例,进一步通过对智能化技术的合理应用,以达到增强系统设备可靠性与安全性的目的,以期能够进一步促进DCS控制和电源控制的技术发展。     

基于PWM功率放大器的新型中频电源研究

介绍了一种基于脉宽调制功率放大器的新型中频电源技术的原理、系统构成和关键问题的解决,实现了中频电源小型化和高性能的技术要求。     

基于DSP的空间矢量控制变频电源系统的设计

本文介绍了采用先进的SVPWM控制策略和软开关技术的变频电源系统的设计。借助于美国TI 公司的THS320F2407DSP芯片强大的控制功能,运用实时的算法,增强了整个系统的快速反应能力,减小了整个电源系统的体积和重量,提高了整个电源系统的安全性和可靠性。     

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。