一种卫星半实物模拟训练等效器的设计与实现

由于在实装上进行卫星地面测试的日常训练可能会造成设备的严重损耗,不能用真实卫星作为日常训练对象。通过分析大量卫星的供配电特性,设计半实物供配电设备模拟器,用其代替真实部件引入闭环回路,实现卫星内部供配电分系统的实物等效。以计算机为核心实现数据采集及数据处理系统,并可实时接收遥控指令、模拟生成遥测数据,配合地面测试系统响应测试流程。硬件实物仿真设计了数据采集、信号产生等硬件板卡,实现配电等效、指令等效、测量等效的功能。模拟器整体设计以PXI总线为接口,满足了系统的模块化及通用化设计,可方便实现其他模拟器的组合及扩展。经过现场运行表明及用户实际测试表明,该设备可完全替代卫星供配电分系统实现卫星电气性能模拟,有效配合地面测试人员的日常训练。     

基于PXI总线的装甲车辆武器测试系统的设计

基于VXI、PXI总线进行各种自动测试系统的开发是目前国际国内较为流行的故障检测诊断方案,文章介绍了一种基于PXI总线的装甲车武器系统自动测试系统;简要说明了PXI系统总线,该系统以PXI內嵌主控计算机为核心,以PAWS的软件为开发环境,基于硬件系统的模块化设计,软件系统利用多线程技术对实时测试系统软件进行了设计和实现,并综合运用标准接口及总线技术、故障诊断技术等来实现系统的综合设计;经验证其有效地提高了系统的可靠性、灵活性,通过实际测试与评估,证明该系统设计方案切实有效。     

基于PXI总线的无线电罗盘信号模拟器设计

无线电罗盘信号模拟器可用于无线电罗盘接收机的检测与维修。为方便携带与系统集成,本文按照合成仪器设计思想,采用标准总线与软件无线电的开放式体系架构,设计出一种基于PXI总线、便于集成、小型化的无线电罗盘信号模拟器。该模拟器可方便应用于机载无线电罗盘的现场维修测试,特别是外场维修检测,提高设备的外场保障能力。     

一种基于工控机的飞控系统模拟器

本文提出了一种基于工业控制计算机开发的某型无人机飞控系统模拟器,详细描述了系统的功能及结构配置,提出了硬件实现方案,并给出了软件模块功能、流程以及实时性的解决方法。该模拟器可用于无人机系统先期设计验证及系统联试。     

PXI总线技术在虚拟仪器中的应用

介绍虚拟仪器和PXI总线的基本内容,以及基于PXI总线的虚拟仪器的组成要素和设计,阐述其优劣势和已投入应用的相火产品,并对其发展进行了展望.     

基于PXI的卫星综合测试系统的设计与实现

在卫星的设计制造过程中,对卫星的各个单机及整星进行大量的测试是一个非常重要的环节,传统的测试系统往往功能单一,且存在精度低、体积大和兼容性差等缺陷;PXI总线是PCI在仪器领域的扩展,虚拟仪器软件体系结构更是通过软件编程的方式对测试仪器进行了丰富的扩展,文中在对基于PXI的测试系统的硬件结构和软件编制进行了可行性研究和论证后,提出了一种基于PXI的卫星综合测试系统的设计方案,并结合某型号卫星的测试需求进行具体的项目开发;实践表明该方案具有结构灵活、体积小、测量精度高和抗干扰能力强等优点。     

基于PXI总线的海防雷达检测平台设计

PXI总线海防雷达检测平台是将基于PXI总线的虚拟仪器技术应用于某型海防雷达检测的首次尝试;针对该类型雷达的测试需求以及系统开放性、可扩展的要求,设计研制了一套基于PXI总线的检测设备;详细说明了基于PXI总线的海防雷达检测平台的硬件构成和软件设计方法,并阐述了组建雷达检测系统过程中重点、难点和实现方法;该系统可有效地解决海防雷达的检测诊断问题,常见故障正确定位率可达90%,提高了雷达装备的保障水平.     

基于PXI总线的海防雷达检测平台设计

PXI总线海防雷达检测平台是将基于PXI总线的虚拟仪器技术应用于某型海防雷达检测的首次尝试;针对该类型雷达的测试需求以及系统开放性和可扩展的要求,设计研制了一套基于PXI总线的检测设备;详细说明了基于PXI总线的海防雷达检测平台的硬件构成和软件设计方法,并阐述了组建雷达检测系统过程中重点、难点和实现方法;该系统可有效地解决海防雷达的检测诊断问题,常见故障正确定位率可达90%,提高了雷达装备的保障水平.     

卫星姿轨控半物理仿真测试系统

为了保证卫星发射前的地面姿轨控半物理试验的顺利进行,研制了姿轨控分系统半物理仿真地面测试系统。为了满足相关类似卫星型号的通用化测试,本套仿真测试系统采用通用模块化的设计架构,同时采用现今主流的PXI总线测试技术（配合VPC转接电路板）。使用标准通用cPCI总线板卡以及部分自制FPGA可编程cPCI总线板卡实现各测试模块的功能。这种架构不仅能实现功能模块化,便于后续的功能扩展及维修,同时具有可靠性高、搭建时间快、可维护性强的优点,且体积小,稳定性强,能适应不同测试对象的测试环境条件,适合长途运输。本文介绍了系统的总体设计结构,重点介绍了模拟总体电源、动力学仿真机、电信号源、程序加载以及外围设备等硬件系统功能,以及相关配套软件的基本功能。测试系统经过与卫星的星地联试,功能性及使用性均得到了验证,测试结论符合设计之初功能性及通用化的构想。     

飞机大气数据系统实时模拟器设计与实现

针对某型飞机大气数据系统在地面静态条件下无法正常输出参数、难以与其他机载系统进行动态联试的问题,提出通过研制大气数据系统模拟器实现动态联试的方案,利用多线程和精确定时等方法提高模拟器的实时性。实验证明,该模拟器可以满足系统动态联试的要求。     

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。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.