基于Qt的虚拟示波器的软面板设计

为了解决用户无法自定义示波器界面的缺陷,文中以实际示波器为模型,使用可视化图形编程环境-Qt平台,开发设计了虚拟示波器的软面板。以实际示波器需要的功能为基础,通过组件化的方式,实现对测试数据的存储、波形显示、回放及仪器界面控制等功能。结果达到了预期效果,设计出的虚拟示波器操作简单、功能强大,同时可以根据用户需要,重组组件设计出更为形象直观的界面,具有很强的可扩展性与可移植性。虚拟示波器势必成为当代示波器发展的方向。     

采用USB接口的虚拟示波器研制

针对中低端用户对示波器的需求是操作方便、易于携带以及性价比高等,本文设计一款采用USB接口的虚拟示波器。系统由USB2.0、模拟信号处理放大、AD转换、FPGA控制器和上位机组成。上位机通过控制加载固件的方式节省了配置芯片,而且采用.NET技术编写出独特的全坐标界面。最后通过实际测试证明了方案的优越性和可行性。     

Virtools中的虚拟示波器设计与实现

虚拟训练作为实装训练的重要补充,已经得到了越来越广泛的应用。针对虚拟维修训练中的电子系统测试,设计能够进行虚拟测量的示波器具有重要意义。在分析了实际示波器功能的基础上,提出了几种基于Virtools的波形绘制算法,模拟了实际示波器波形显示与调节等功能。     

基于虚拟仪器技术的虚拟示波器设计

笔者设计了一款基于虚拟仪器技术的虚拟示波器。该系统基于LabVIEW的平台,利用LabVIEW强大的图形显示功能和信号处理能力,能够实现示波器的基本功能,包括波形显示、波形控制、参数测量、波形存储以及频谱分析功能。该款虚拟示波器基本上能够满足实验室的测量需要,具备一定的实用性,可操作性强,同时由于设计基于模块化,能快速实现功能扩展。     

基于Cortex-M4单片机的多功能虚拟示波器的设计与实现

设计一种以STM32F405单片机为主控器的虚拟示波器,该单片机以高性的32位Cortex-M4为核心,具有卓越的数据处理性能。该多功能虚拟信号分析仪可以实现双通道示波器、电压表、频谱分析、8通道逻辑分析仪和双通道信号发生器等功能。该设计方案具有成本低、体积小、使用简单的特点,可以满足中低端用户的电子实验调试。     

LabVIEW环境下基于声卡的虚拟示波器软件设计

基于计算机声卡的虚拟仪器成本低、通用性强,在对采样频率要求不高的情况下,可以用声卡取代数据采集卡进行采样和输出.利用虚拟仪器开发工具软件LabVIEW及其数字声音记录节点,研制出基于声卡的虚拟双踪数字存储示波器,其功能和界面都与真实示波器相同.重点阐述了数据采集、触发控制、显示控制几个主模块的设计方法.     

基于LabVIEW的虚拟数字存储示波器的设计

利用 LabVIEW 强大的数据采集、处理和程序设计功能,设计、开发了一款数字存储示波器。它主要是由信号输入模块、数据处理模块和波形显示及存储模块组成,是通过软件编程实现信号的显示和测量等功能的。在虚拟示波器上集成的虚拟信号发生器可以在声卡采集和虚拟信号输入之间切换。实验结果表明,该虚拟示波器基本实现了传统示波器的功能,并且运行可靠、性能良好,能够满足普通实验室正常的使用需求。     

具有信号源、示波器、数字万用表功能的一体机

设计了一种具有信号源、示波器、数字万用表功能的一体机,将数字万用表模块、信号源模块、示波器功能模块集成在同一壳体内,充分利用空间,降低了制造和使用成本,使用更方便.示波器模块、信号源模块、万用表模块共用交流电源,同时万用表模块可采用备用电池供电,在不需要示波器和信号源功能的情况下,为用户使用万用表提供方便.     

虚拟示波器的设计与实现

虚拟示波器利用LabVIEW图形化编程语言开发实现.它具有数据采集、存储、回放,波形显示,电压、相位、功率测量和远程测控等多种功能.结合虚拟示波器设计与实现过程的实例,具体阐述了使用LabVIEW进行虚拟仪器设计及远程测控的方法、步骤与实现技术.     

红外热像仪故障诊断系统虚拟示波器的设计

针对红外热像仪故障诊断系统所需要的特征参数测量功能,设计基于Labview的虚拟示波器,实现故障诊断过程中对特征波形的测量,为故障诊断定位提供指导;首先分析红外热像仪故障诊断系统故障参数的信号类型及功能需求,设计虚拟示波器的整体机构,在此基础上,提出特征波形采样的硬件电路及上位机软件的设计方案,实现故障诊断功能;实验结果表明:虚拟示波器功能完善,实用性强,可以满足对故障参数测量的要求。     

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。     

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.