基于WLAN的分布式混合总线ATS设计与实现

复杂电子装备通用化、大型化、环境特殊化的特点和新型装备与原有系统叠加组合使用现象日益突出;为应对设备保障灵活化、分布式、组合使用的通用性要求,将网络测试技术、混合总线技术和模块化测试单元组合应用于电子设备不同测试环境内的保障测试项目,通过研究分布式自动测试系统构建过程中所涉及的测试设备组网、混合总线仪器控制等关键技术,提出了基于WLAN的分布式ATS测试方案,通过无线总线桥的设计使用,整合GPIB、VXI、RS232/429和LXI模块化总线测试设备,实现了测试网络根据需求可选择、可重组、分布式,测试设备模块化、体积小、便携通用的设计要求;经实际使用证明能有效提高测试效率,满足多型电子装备多级保障测试需要.     

便携式薄膜拉伸测试仪的设计与研制

薄膜产品的拉伸性能是质量监管部门产品监督检查中的重要质量考核点，但目前并没有可以便携的小型精密拉伸测试仪器用于快速临检。针对这一情况，依据薄膜产品的质量概况，选择合适量程的小型部件，以PLC作为控制核心，集中在较小的主机内，并增加携行组件，以实现便携快检能力。对样机进行计量和场景模拟测试，结果表明设备精度符合1级试验机的技术要求，携行和运输也满足便携快检要求。     

平整度测试系统中USB通信模块的设计与实现

充分利用了通用串行总线USB的技术特点，在道路平整度测试系统中，实现了利用USB进行数据采集传输，改变了传统的利用PCI总线接口形式的A/D采集卡与上位机进行通信的方法。经测试，完全可以满足快速实时的传输要求。同时具有即插即用、便携的优点，并且大大降低了测试设备的成本。     

机载火控系统通用测试平台设计与实现

机载火控系统种类繁多,设备日益复杂且不断更新,对机载火控系统检测系统的开发速度和更新速度提出了更高的要求,通用测试平台能够实现测试设备的快速开发和同步更新,满足机务部队快速保障的需求;介绍了基于虚拟仪器技术和PC104总线的硬件通用平台的设计方法和基于测试模型的软件通用平台的设计方法;实践证明,该机载火控系统通用测试平台能够实现测试系统的快速开发和更新,且环境适应能力强,运行可靠,使用方便。     

电子装备网络化测试诊断系统设计

网络化测试诊断技术是当今测试诊断领域的发展热点,结合电子装备维修保障的现实需求,以无线网络作为依托,采用先进的虚拟仪器技术组建分布式远程测试诊断系统;该系统可对电子装备运行状态进行远程实时监控,对故障进行综合测试诊断,并具有远程维修支援和远程仪器控制功能,从而实现系统中装备维修保障资源的互联共享,达到联合测试诊断的目的,满足现代电子装备快速维修保障的需要.     

基于分布式架构的快速诊断测试技术研究

针对装备保障方式提出的机动灵活、快速测试、及时诊断的新要求,提出了一种基于分布式架构的装备快速诊断测试系统方案,通过融合分布式测试、并行测试、合成仪器、多专家诊断等多项技术,设计了系统的整体模型,给出了系统构建的方法,具体介绍了系统组成和技术实现途径,结合装备使用特点研究了本系统在整个装备保障体系中的多种工作模式,并通过关键技术分析阐述了本方案的可行性,为装备测试保障技术的发展提供了一条参考途径。     

一种便携式低成本通用并行测试设备研制

为解决传统装备维修保障体系一对一测试环节效率低、成本高的缺点,满足现代保障体系对自动化、高效化、便携化的不断追求,研发新型并行测试软件平台、多核多线程并行管理技术,并依托“三化”、便携、柔性设计研制一种基于CPCI总线的并行测试设备。经验证,低成本、小型化、资源高度集成前提下设计开发的各功能组件以及多核多线程集群管理技术的优化使用,使得该设备拥有便携、高性价比、1-4台装备隔离高效并行自动测试、多装备通用等显著优势,大幅提升测试效率至400%、缩短复杂武器装备各阶段全流程周期,并锐减75%的人力、设备、环境资源投入,测试结果、原始数据的实时在线存储、智能判读及曲线回放亦突出显示了该设备故障诊断性能的卓越性。     

基于Labwindows/CVI的数字电路板检测与故障诊断系统

为了实现对某型测试设备中数字电路板的快速准确检测,提高装备的维护保障能力,设计了一种基于Labwindows/CVI的数字电路板检测系统。该检测系统软件采用Labwindows/CVI作为开发平台,能够实现装备中的数字电路板的功能验证与故障诊断测试,能够满足内外场数字电路板卡快速检测和故障诊断的需要。实际应用表明,该系统具有检测准确、故障信息准确率高、稳定可靠、操作方便的特点,该系统的应用提高了装备的维修保障能力。     

新一代综合自动测试系统在船用雷达测试保障中的应用研究

以舰船装备综合测试的迫切需求为背景,提出了新一代综合自动测试系统(IATS)总体架构,构建新一代综合自动测试系统设备体系；针对某型船用搜索雷达,分析了船用雷达整机/分系统部件内场测试和外场原位监测评估等测试诊断需求,开展了新一代综合自动测试系统适应性和适用性等应用技术研究,实现了船用雷达工作频率、功率、带宽、噪声系数、窄脉冲信号等参数性能自动化测试和增强型原位监测评估功能。经分析评估,新一代综合自动测试系统设备体系可以满足船用雷达装备研制、试验和使用维护阶段测试保障应用,对提升其寿命周期内的测试保障效率和效能具有重要支撑作用。     

无人机电源地面测试系统设计

为了实现对某型无人机电源系统的快速检测,设计了一种基于Labwindows/CVI的无人机电源地面测试系统。测试系统的硬件部分能够实现数据的快速采集,软件部份分为数据采集软件和数据处理软件。实际应用表明,该系统测试结果达到设计要求,具有运行稳定可靠、操作方便、维护简单的特点,能够满足无人机电源系统的维护保障需要。     

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.     

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.     

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.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

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。