一种基于虚拟示波器技术的数据采集系统

基于虚拟示波器技术的数据采集在电子测量和检测领域具有广阔的应用前景。讨论了在Win32环境下，用PC机和PCL－1800数据采集卡构成虚拟示波器以实现数据采集系统的方法和思路，该系统实现了信号的自动采集，并能通过计算机进行数据的实时显示和处理。     

TDS-ACS实验系统中虚拟示波器的设计

介绍了TDS－ACS实验系统中虚拟示波器的设计方法。该虚拟示波器利用软面板在实时动态波形显示窗口中给出系统的响应,并具备一些图形控制功能。实验系统投入使用后，收到了良好的效果。     

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LabVIEW与PCI-1714的高速虚拟示波器的设计与实现

本文以研华公司生产的PCI-1714高速数据采集卡和PC机或兼容机为硬件基础,根据虚拟仪器的设计机理,采用图形化编程语言LabVIEW7实现了一种高速虚拟示波器的设计和开发.该虚拟示波器具有数据采集、实时波形显示、数据存储及输出打印等功能.实验表明,该虚拟仪器的精度和稳定性较高、反应灵敏,在测量过程可实现在线参数调整,且人机界面友好.     

利用Matlab编程实现数字示波器专用功能的开发

介绍利用X-Stream和Matlab编程对数字示波器测量与数据处理功能进行扩展的一种方法。X-Stream保证数字示波器在进行复杂的波形测量的同时进行大量数据的传输,Matlab为数据处理提供了丰富的函数功能,将二者结合开发了用于声发射源定位的专用示波器功能模块,介绍了软件的编程和测试结果。利用这一功能,示波器可对测量数据进行特征提取,并实时显示声发射源位置。     

虚拟多功能数字存储示波器的研究与设计

本文利用虚拟仪器开发平台LabVIEW和数据采集卡PCI-6024E设计了一种虚拟多功能数字示波器。它不但具有传统示波器波形显示控制的功能，而且还对传统示波器的功能进行了扩展，实现了参数自动测量显示、波形读写和波形打印等传统示波器无法实现的新功能，并将波形显示、相关分析、数字滤波、频率响应分析等功能融入仪器设计中，构成了全新的多功能示波器。     

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。     

虚拟示波器系统组成研究及相关程序设计

介绍在通用微机系统平台上，利用多线程技术、设计虚拟示波器系统的一般方法，利用实例，重点介绍虚拟示波器系统的功能设计、计算机系统的选择、各主要组成环节，界面的布置，采样类及显示类的结构等内容。     

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.     

基于高速数据采集卡PCI-6143的虚拟示波器设计

介绍一种基于虚拟仪器技术的虚拟示波器设计方法,利用NI公司高速数据采集卡PCI-6143及LabVIEW应用开发环境,设计了一种基于PCI总线的虚拟示波器。该系统由数据采集、DAQmx、数据分析处理及波形显示输出控制等三部分构成,可实现四通道信号的测量与分析。文章描述了系统的工作原理,简要介绍了虚拟示波器的主要功能,并就其中有关触发、数据分析等关键技术进行了阐述,最后结合实际测试数据,给出了信号的数字滤波和频谱分析结果。     

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。     

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.     

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.     

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。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.