高性能的工业通用型数据采集卡的研制

为了满足常见工业控制场合对数据采集的需求,利用内含24位A/D转换器的ADμC834及通用模拟量采集电路,研制了一套多通道、高性能的通用型采集卡,实现了对各种模拟量信号的通用采集。该采集卡有16个模拟量输入通道,在任何一个通道上都可以实现标准电压、标准电流、热电偶、电阻/热敏电阻、三/四线制热电阻信号的采集。该数据采集卡精度高、成本低,具有很强的通用性和抗干扰性,已用于实际的工业现场中,结果令人满意。     

基于非线性微分方程的混沌产生和辨识方法研究

利用非线性微分方程的数值解法,得到典型非线性微分方程所产生的混沌信号,详细研究该信号的特征,进而提出基于"相关平面"混沌和噪声的辨识方法.可以看出基于非线性微分方程可以得到不含噪声的混沌信号,所提出的辨识方法简单、直观、且具有较强的抗噪声能力.     

基于PCI总线的DDC系统设计与实现

介绍基于PCI总线多功能数据采集卡(PCI-1711)的管式电阻炉温度DDC系统的设计与实现.以具有A/D、 D/A转换功能的数据采集卡,配以外围电路,实现工业现场信号的测量及系统模拟信号的输出.以工控组态软件(MCGS)实现数据采集卡的驱动,并编写制作出用户界面友好、控制算法灵活,具有工程应用价值的历史报表、直观的实时曲线和历史曲线.     

利用特征技术的NC工艺过程设计

一部分为数据采集与转换,主要采集由原始信号变换为有功功率信号,并将模拟量转换为数字量;第二部分为数据处理,由单片机构成计算机系统,对采集到的信号进行计算与存贮;第三部分为输出,其主要任务是将暂存于微机系统中的数值定期或不定期输出。 数据采集与转换 经过变换后的有功功率信号仍为模拟量。要计算有功功率的数值,必须经过A/D转换器的转换才能将模拟量变为数字量。这里采用的A/D转换器为ADC0809,是分辨率为8位的模拟转换器。由于经过处理后的电功率是一个波动频率比较小、在     

基于虚拟仪器的双通道语音数据采集系统

本文利用动态数据采集卡PCI-4451和图形化编程语言LabVIEW设计了一种基于虚拟仪器的双通道语音数据采集系统,该系统可以满足对动态语音信号进行高精度、高频率采样的要求,同时,可以对每个通道的动态输入范围进行单独设置,以保证量化噪声对动态范围不同的信号的影响尽可能保持一致.     

采集系统中光电信号调理电路的噪声分析

在用数据采集卡对传感器输出信号进行采集的过程中,往往需要先对传感器输出的信号进行放大、滤波、A/D转换等一系列信号调理过程.信号调理电路的噪声直接影响整个检测电路的检测水平,为此,根据光纤电压互感器中光电信号检测的实例,说明了信号调理电路的噪声分析与抑制措施,为以后信号检测精度的提高提供了依据.     

基于LabWindows/CVI的脑电信号采集系统

基于LabWindows/CVI虚拟仪器软件开发平台,以计算机和数据采集卡为主要硬件,构建了实现脑电(EEG)信号采集的虚拟仪器系统。该系统操作简单、仪器调试方便、界面友好、可扩展性强、成本低,是一种可广泛在实验室推广应用的EEG信号采集系统。     

基于虚拟仪器的汽车板簧载荷测试系统

介绍了基于虚拟仪器的汽车板簧载荷测试系统的硬件组成、位移测量和电液伺服位置闭环控制方法、系统的功能和关键技术。数据采集卡采用了高速的A D转换器和DMA方式 ,系统通用性强、界面友好。     

高速电机控制领域的PCI总线的数据采集卡设计

介绍了利用PCI9052接口芯片进行基于PCI总线数据采集卡的设计原理,组成及实现.介绍了A/D、D/A、LS7266R1及电源设计的关键问题,最后简要给出了数据采集卡的驱动程序设计.     

AppleⅡ微机用于高精确度数据采集

本文对AppleⅡ个人计算机的12位A/D卡进行了剖析,介绍了这个卡件的工作原理、基本的数据采集程序和A/ D转换子程序,并对输入信号的实时图形显示和数字滤波等也作了介绍。     

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.