飞机舵机控制系统的电磁兼容性设计

电磁兼容性对于电子设备来讲是至关重要的,它直接关系到整个设备的安全运行;为了在实际工程中提高电子设备的抗干扰性能,对一种飞机舵机控制系统的电磁环境及频谱进行了分析,提出了相应的几种电磁兼容性设计方法,包括印制电路板与元器件的合理布局、屏蔽机箱设计、滤波设计和接地设计的方法;飞机舵机控制系统经过RE101和CE101等九项电磁兼容性实验,各项指标均符合国家标准;该系统的电磁兼容性设计措施具有一定的通用性,也可以应用到其它电子设备的设计中.     

组装技术中的电磁兼容

本文简要介绍电磁兼容性技术在电子设备组装结构设计技术中的应用，对电子设备的电磁干扰和干扰源进行了分析，并提出了一些可用于电子设备组装结构设计技术中的电磁兼容性设计方法。这些方法多年来用于多种型号计算机的研究和制造，取得了良好的效果。     

彩色显示器电磁兼容性初探

电磁兼容性设计在现代电子设备中日趋显示出其重要性，本文对彩色显示器电磁兼容性作一初步探讨。     

基于多总线机载电子设备自动测试系统设计

飞机机载电子设备日益复杂,对飞机机载电子设备的检测和维护提出了更高的要求;当前,飞机机载设备的自动测试系统技术已经发展到基于多总线的综合测试系统阶段;但不同标准总线的兼容性是开发多总线测试系统的一个急待解决的课题;介绍了基于VXI。PXI,GPIB总线的机载设备自动测试系统,并且从硬件架构和软件系统设计上提出了一种实现不同总线兼容性的设计方法;通过实际测试和评估,该自动测试系统运行良好,证明该设计方法十分有效。     

基于PEEC的电子设备电磁兼容层次化预测方法

为提高电子设备电磁兼容预测的准确性和抗干扰能力,提出基于部分元等效电路(PEEC)的电磁兼容性层次化预测方法.构建电子设备电磁信号模型,波束聚焦和模糊识别电磁信号后对其进行调制.利用空间波束形成处理方法对调制后的电磁信号进行兼容性融合和滤波处理,提取电磁信号的谱特征.采用PEEC参数估计方法结合谱特征结果多层次预测电子设备电磁兼容性.仿真结果表明,采用该方法对电磁兼容预测的拟合性较好,信号匹配度水平较高,抗干扰能力较强,明显提高预测电子设备电磁兼容性的准确性.     

手术床控制系统的电磁兼容性设计

在手术室环境下,电磁干扰比较严重,各种医疗设备的正常工作较容易受到影响;针对手术室中常用的医疗设备———电动手术床,对其控制系统进行电磁兼容性(Electromagnetic Compatibility,EMC)设计,提高其EMC性能;首先采用故障树分析法对手术床控制系统进行EMC风险评估,找出导致控制系统EMC性能不良的原因;然后利用CAN总线、隔离、滤波等技术来完成本控制系统的EMC设计,软件方面采用抗干扰技术来保证程序的正确执行;经过测试表明,采用CAN总线设计的手术床控制系统具有较好的电磁兼容性,抗干扰性能较好,EMC风险评估方法和EMC设计方法具有参考价值。     

结构设计对电子设备电磁兼容性的影响

在电子设备的电磁兼容性设计中,结构设计的合理性是至关重要的,否则将会影响整个设备的正常工作,主要分析结构设计对电磁兼容性的影响,最主要的是分析如何进行合理的结构设计来提高电磁兼容性。     

飞机电磁兼容预测分析系统设计

现代飞机电子设备类型、数量和工作方式众多,频率覆盖范围宽、发射功率大、灵敏度高,飞机电磁兼容性问题是飞机设计与试验工作的重点之一.提出了一种飞机电磁兼容预测与分析系统的设计方案,通过获取的飞机各设备设计数据和积累的经验数据,运用预测分析算法和电磁计算工具,预测飞机潜在的干扰问题,起到事半功倍的效果.     

印刷电路板的电磁兼容性设计

全面地论述了电子设备的电磁兼容性问题。比较详细地分析了印刷电路板设计中的电磁兼容性所涉及的多方面因素,并介绍了有效抑制和防止干扰的各种措施及其原理。     

窄带HPM强电磁环境中控制系统的EMC分析和设计

针对窄带高功率微波(HPM)强电磁环境对控制系统的性能影响,采用理论分析和实验测试等方法对电磁干扰(EMI)的干扰源和耦合途径进行研究,提出控制系统电磁兼容性的设计方法,从电磁屏蔽、滤波和接地等方面进行分析并采取措施。实验结果验证了控制系统在屏蔽、滤波和接地等方面采取的措施,对抑制窄带HPM源强电磁环境下的电磁干扰有效可行,控制系统的设计满足HPM源的工作要求。同时窄带HPM控制系统的电磁兼容性(EMC)分析和设计也为强电磁环境下仪器设备防护加固提供技术支撑。     

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。     

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。