基于ARM11平台和GPRS远程无线图像报警系统的研究

设计和实现了一种基于ARM11平台和GPRS通信技术的无线远程图像报警系统,论述了系统的总体结构及其设计思路。利用嵌入式ARM11和GPRS协议进行数字图像处理,完成了图像报警终端的软硬件设计,使报警终端通过无线网络与手机等设备连接,最终实现实时截图报警监控的功能。     

基于物联网的电梯安管系统通信模块

电梯安管系统是采用多个独立传感器24小时不间断采集电梯运行数据,通过无线实时上传到电梯运行监管平台,实现对电梯的全天候运行监测、故障信息记录、报警预警处理和维保管理等功能的系统. 针对传统电梯安管系统传输响应时间过长的问题,设计实现了一套基于物联网的新型电梯安管系统. 系统在管理平台上设计了一套新型的数据传输通信模型,该通信模型向下通过GPRS与底层网关交互,向上利用基于JMS的ActiveMQ消息队列服务与业务层交互,大大缩短了响应时间.     

通用型汽车故障诊断仪在iOS平台上的设计

针对目前汽车故障诊断设备通常需要单独硬件支持并且扩展性、便携性较差等问题,在如今智能手机日益普及的环境下,通过分析车载CAN网络诊断协议ISO15765以及UDS统一诊断服务,提出建立可跨平台与车系的诊断数据库。设计蓝牙通信模块并在此基础上基于iOS平台开发汽车故障诊断软件,实现便携式的汽车故障诊断。通过在实验平台上的测试结果表明,所设计的汽车故障诊断仪能够准确诊断和解析汽车ECU中的故障,实现不需要额外硬件成本仅利用移动终端完成的汽车故障诊断与定位。     

新型井道式电梯远程实时监测和报警系统

针对电梯故障频发与救援不及时等问题,基于ZigBee、GPRS与RFID等技术,设计了一种新型的井道式电梯远程实时监测和报警系统.系统通过ZigBee无线组网传输传感器采集到的数据,解决了井道内布线难的问题,并实现了应用一个GPRS模块就能服务于整幢楼内所有电梯的功能.RFID维保刷卡模块有利于政府质监部门实时掌握和有效监督电梯的检验、维保等状况.结果表明,该方案设计合理,为电梯安全监管提供了新的技术支撑.     

基于LS-SVM的电梯制动器故障诊断

根据电梯制动器故障的特点,提出了一种基于最小二乘支持向量机(LS-SVM)的电梯制动器故障诊断方法。该方法通过检测制动器制动过程中闸瓦间隙信号,采用小波包分析提取的故障信号特征,同时利用LS-SVM实现电梯制动器的故障诊断。实验结果表明,该方法能准确地诊断制动系统的故障,有效地避免了事故的发生。     

基于GPRS的电梯在线监控系统的设计

为了解决信号在CAN总线中的有效传输距离有限的问题,提出了一种基于嵌入式ARM处理器和GPRS无线通信技术的电梯远程监控系统方案。该方案通过LPC2148和EM310组成的电梯终端来将电梯的运行状况和故障信息经GPRS网络发送到远程监控中心,然后对监控中心上位机软件进行操作来实现电梯的远程监控,从而解决了信号传输的距离问题。     

ActiveX技术在卫星故障诊断中的应用

利用ＡｃｔｉｖｅＸ技术实现故障诊断网络化,将ＡｃｔｉｖｅＸ技术与故障诊断技术相结合的方法,基于Ｗｉｎｄｏｗｓ ＮＴ网络系统,实现了某型卫星电源系统的网络状态监测与诊断,包括数据生成、报警、故障检测（推理机、知识维护、对策、解释、征兆获取等）、数据查询等功能。实现了网络状态监测及报警。     

基于GPRS的电梯在线监控系统的设计

针对信号在CAN总线中有效传输距离有限,对采用CAN总线技术的电梯远程监控系统提出了一种基于嵌入式ARM处理器和GPRS无线通信技术的电梯远程监控系统的方案.通过由LPC2148和EM310组成的电梯终端将电梯的运行状况和故障信息,经GPRS网络及时发送到远程监控中心,然后经由监控中心上位机软件的操作,实现了电梯的远程监控,解决了信号传输距离的问题.     

基于拨号方式的电梯报警系统的设计与实现

电梯故障报警是电梯安全系统的重要组成部分,故障报警的实时性是衡量电梯监测设备和电梯管理系统性能的一个重要指标。针对GPRS通信的时延性和受信号强度影响大的特点,提出基于拨号方式的新型报警系统,将GSM和调试解调器的语音拨号技术应用到电梯报警系统中。首先介绍系统结构设计,包括电梯监测设备的报警模块和中心服务器报警管理系统两部分。详细介绍了基于TC35i的报警模块设计,中心服务器报警管理系统的数据库设计和软件设计。最后给出了管理系统运行界面及其实际运行结果,报警系统能够稳定良好的运行,软件界面友好,报警实时性高,降低了电梯故障时间。     

基于专家系统的交互式故障诊断软件研究

针对当前自动测试领域中测试诊断软件人机交互功能不强的特点,基于故障诊断专家系统,结合人工与自动测试的各自优点,建立了交互式故障推理模式,并利用构件技术设计和实现了基于该模式的交互式故障诊断软件;该软件可以结合用户经验知识,根据其不同测试方法和测试特点,逐步进行测试、推理、隔离定位至具体故障,从而灵活地完成测试任务;实践证明,该故障诊断软件较好地实现了人机交互,减少了重复测试,提高了测试诊断效率。     

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。