航空瞄准显示设备外场检查仪设计

航空瞄准显示设备是战斗机武器系统的重要组成部分,对其性能的检查测试研究十分必要。嵌入式PC由于功能扩展性强、体积轻便已经成为测试设备的主要搭建平台,文中设计了一种基于技术成熟的PC／104总线计算机测试平台的外场检测系统,能实现对机载设备信号的原位检测。根据航空瞄准显示设备测试需求,在多种方案中比较优选,制定出软、硬件结合的设计方案,并介绍了采用的主要技术手段。本系统的开发和应用,为提高装备的维修保障能力提供了一种有效手段,也为类似检测设备的设计提供一种有效的方法。     

ATE系统信号链路对微波信号的衰减分析

ATE利用各类测试仪器和软件模拟机载电子设备实际工作时的电子环境,进行性能测试定检。当所有信号通过ATE流通到阵列接口时,被测的机载设备通过单独设计的适配器与阵列接口相接,使机载设备在这种模拟出来的电磁环境下能正常工作。从信号链路对信号衰减的角度来分析ATE系统的性能。     

面向机载设备自动化测试的信号模型

在机载设备测试中,各种测试信号的准确定义和检测是保证飞行安全的关键因素。文中提出一种面向自动测试机载设备测试需求描述的信号模型,通过对机载设备测试需求中所涉及到的信号进行分类,以及将测试设备和被测设备之间传送的信号视作带有一组参数的动作,建立适用于自动测试机载设备需求描述的信号模型,旨在解决目前工业界中机载设备自动化测试需求中的信号规范描述问题。最后通过典型案例说明了该信号模型的特点和可行性。     

航空视频信号监视技术在检测设备中的应用

随着航空机载自动测试设备在飞机定检和日常维护中发挥着日益重要作用,如何在自动测试设备中实现对装备着大量与视频信号相关的且交联关系十分复杂的航空设备测试成为难点。介绍了使用一种设计简单的视频液晶监视器来满足各种相关视频信号的集中监视,提高了在自动测试设备中对具有视频信号的航空机载设备的检测效率。实验结果表明,通过采用相应处理方法可以实现各种视频信号在液晶显示器上的集中显示。     

一种航空电子控制器测试设备的设计与实现

针对某航空电子控制器产品需求,设计了一种多功能测试设备,详细描述了测试设备的总体设计,硬件设计和软件设计,并对其中关键技术进行了重点论述;测试设备采用了C#和ARM技术结合,利用基于组件的开发方法,合理划分组件,有效提高了测试设备通用性和重用性,缩短了产品的测试周期;该测试设备主要应用于某航空电子控制器的产品调试、环境应力试验、交付验收、故障排除;使用后证明,测试设备的软/硬件设计合理、自动化程度高、工作稳定可靠。     

基于PCI总线的ARINC629数据通讯卡设计

经过对三种航空数字总线通讯方式的比较,在提炼出ARINC629规范终端功能的基础上,提出了用于波音等大型商用客机机载设备测试诊断平台的ARINC629数据通讯卡的总体设计方案;基于微机总线的发展趋势,将数据通讯卡定位为PCI板卡的形式,完成了数据通讯卡中协议电路、DSP控制模块和PCI总线接口的硬件设计,以及DSP模块程序、用户界面和驱动程序的软件设计,实现了通信协议,为机载电子设备的测试和故障诊断设备的研制奠定了基础。     

通用机载电子设备测试平台设计

机载电子设备装机前试验是保障飞机总装质量的必须环节。为解决多种机型、数十种设备的装前检查需要,设计一套基于接口数据描述的通用机载电子设备测试平台,将被测设备的输入输出信号进行统一描述,形成"面向数据"的测试,实现测试应用与设备接口信号的隔离,使得该测试平台通过扩展接口就可以支持各类机载设备的测试。     

浅谈航材在储存保管中的腐蚀和防护

航材即航空器材,主要包括维修保养直升机所需的发动机、机载设备、零部件、检测设备仪器及维修工具等。直升机是非常重要的航空器,其航空器材的好坏直接影响着航空飞行安全和直升机维修质量,所以一定注意航空材料的储备,了解储备方法可以有效避免航空器材在存放过程中发生腐蚀、损坏等情况。本文对航空器材的腐蚀原理进行了分析,并说明了防止航空器材腐蚀的方法。     

基于GL Studio的LCD数值显示器虚拟模型设计

GL Studio是一款专业的仪表仿真平台,在开发机械式虚拟仪表模型时非常方便,但随着电子信息技术的不断发展,越来越精密和复杂的电子显示设备在机械电子航空以及军事训练等领域广泛应用,给虚拟仪表建模留下了难以解决的问题。LCD数值显示器是比较常见的电子显示设备,针对LCD数值显示器的特点,本文提出一种基于GL Studio的LCD数值显示器虚拟模型的设计方法,最后通过实验对该模型进行测试,实验结果表明了此方法的有效性。     

Python在SpaceWire模拟源系统上的应用

SpaceWire网络协议是一种航空总线标准,在航空设备上得到了广泛应用。为了开发出稳定的基于Spacewire网络协议的设备就需要有一套测试设备实时抓取总线信号来进行分析。那么为了保证测试设备的稳定性,还需要一台基于SpaceWire网络协议的模拟源设备用来验证测试设备的可靠性。传统模拟源设备主要是基于FPGA平台开发的,为了模拟SpaceWire总线的正常状态、组帧协议以及各种异常错误状态,经常需要修改Verilog代码,这是一个非常耗时费力的工作。本文在传统平台基础上引入了Python来解析数据序列,极大的方便了程序修改,加快了对测试设备的验证。     

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。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

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.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.