剩余电流式电气火灾监控探测器控制电路板检测系统设计

剩余电流式电气火灾监控探测器控制电路板的性能参数检测是进行新产品研发和保证产品生产质量的重要手段;在需求分析基础上设计并实现了一种利用虚拟仪器技术构建的剩余电流式电气火灾监控探测器控制电路板性能参数自动检测系统;硬件由工业控制计算机、高精度数据采集卡和信号调理电路等构建,软件采用LabVIEW平台开发,完成数据采集、分析、处理和显示的功能,整体实现了对剩余电流式电气火灾监控探测器控制电路板的自动测试;实际应用证明,该系统具有高的测试精度和效率,为简单快速检测剩余电流式电气火灾监控探测器控制电路板提供了一种有效的方法。     

基于无线通信技术的电气火灾智能监控系统

为了提高电气火灾监控效果，该文设计了基于无线通信技术的电气火灾智能监控系统。根据无线通信技术设计无线通信网络，由ZigBee主站、ZigBee从站等构成，通过剩余电流探测器与开关电压调节器实现电气火灾剩余电流的监控，通过自适应算法实施信号滤波处理，基于模糊神经网络设计预警算法实施电气火灾预警。测试结果表明，无线通信网络的丢包率较低，信号强，整体信号测量误差低，报警相对误差低，报警响应时间短，施加浪涌脉冲后运行稳定。     

基于STM32的故障电弧监测方案设计

针对电力系统发生故障时异常的电弧和温度,设计基于STM32的监测方案。通过各种传感器和外设采集数据,利用STM32平台对测得的数据进行分析,从而降低电气火灾的发生概率,减少经济损失。故障电弧的电流通常伴随着过零点出现“平肩”,即零休现象,存在高频谐波,还会发生火灾,同时周围温度会升高。利用电流传感器以及温度传感器,将测得的信号数据输入STM32芯片;经过A/D转换后计算分析,再实时将数据通过LoRa模块上传至云平台进行预警。     

基于MC9S08AW60剩余电流式电气火灾监控系统

阐述了剩余电流检测的基本原理及剩余电流式电气火灾监控系统的工作原理。在工业现场24V恒流源下,设计了具有检测剩余电流和过流保护功能的4路剩余电流式电气火灾监控系统。实际运行结果表明,该系统能够通过上位机及时可靠地为维护工程师提供准确的信息,具有检测结果精确、响应迅速、操作方便等特点。     

单片机与LoRa通信模块的电气火灾探测器设计

本文设计了一套基于单片机与LoRa组合式电气火灾探测器.探测器设计了电压采集调理电路、电流采集调理电路、剩余电流采集调理电路及温度采集调理电路,检测线路中的三相电压、三相电流、剩余电流及温度等电参量与温度参量,若线路存在过欠电压、短路、开路、漏电及温度异常等电气故障,现场立即发出声光报警且显示其故障信息,并通过LoRa...     

基于航空交流故障电弧标准的电弧仿真研究

随着飞机多电全电技术的迅猛发展,电力系统在飞机中的重要程度不断提升,而电弧故障是航空电力系统多发的一类电气故障,会引起飞机火灾,轻则烧毁线路,重则引起飞机坠毁。因此,航空交流故障电弧的研究对保障飞机电力系统的安全十分重要。针对传统航空交流故障电弧模型种类单一、难以准确模拟真实故障电弧的特点,基于航空交流故障电弧试验标准下点接触电极、点接触截断和松动接线柱试验中得到的故障电弧电压、电流特性进行分析后,提出模型改进方法,形成航空交流电弧仿真优化策略,从而涵盖所提航空交流电弧试验标准下的故障电弧特性。通过MATLAB/Simulink完成了电弧模型的搭建,对电弧数据及模型仿真结果进行特征量提取及比较,验证了航空交流故障电弧模型仿真策略和方法的有效性。     

浅析剩余电流式电气火灾监控系统的功能及设计

通过对安装剩余电流式电气火灾监控系统的必要性进行阐释,介绍了该监控系统的定义、原理和功能,并分析了其设计方法、设置位置等,以期提高和完善该监控系统的设计水平。     

基于神经网络技术的电气火灾预警系统研究

为了提高电气火灾预警能力,构建了一套电气火灾预警系统。该系统通过主控制单元可编程逻辑控制器（PLC）实现数据的分析与处理。采用探测器对电气设备运行状态进行探测。采用监控主机对电气运行设备进行现场监控。采用窄带物联网（NB-IoT）技术进行对监控数据的长距离传输。利用改进反向传播（BP）神经网络算法,提高了电气火灾故障的识别能力,增强了电气火灾预警能力,实验表明,该研究系统电气火灾预警响应最短时间为0.5 s,电气火灾故障识别的准确率高达96%,故障识别准确率高,大大提高了电气火灾预警能力。     

剩余电流式电气火灾监控系统研究

电气火灾发生原因众多,从剩余电流的角度研究,采取相应措施有助于规避火灾风险。笔者重点介绍了剩余电流的相关内容,同时从电气火灾监控系统运行原理、系统框架、实际应用等角度分析了电气火灾监控系统,研究了监控系统安装准备工作、焊接注意事项、调式相关问题,希望能够为建筑领域更好地推进电气火灾监控系统施工提供参考。     

一种建筑物低压供配电线路故障电弧检测新方法

故障电弧电流值小,不足以使传统断路器动作切断电源,成为电气火灾的主要原因之一。本文通过对建筑物低压供配电线路中的故障电弧建模,分析故障电弧特征。采用小波分析方法对采集的数据降噪和特征提取,与傅里叶变换方法相比较,并分析了电路中负载改变时的情况,仿真结果表明该方法可有效检测故障电弧的奇异点,准确辨识故障电弧。     

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     

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.     

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.     

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.