高速数据采集系统的USB接口设计

针对工程领域对数据采集的多类别数据、高速采集和传输、实时性的要求,设计基于USB接口的高速数据采集系统,并有FPGA+DSP搭配进行采集系统的逻辑控制、接口控制和信号处理,另有一块AD转换板进行模数转换;重点阐述USB接口设计的原理和实现,包括USB固件程序设计、驱动程序设计和USB应用程序设计;经过传输256*256的灰度图像、测试USB通道数据传输速度和使用采集板采集方波信号的测试,证明系统能够实现数据采集的任务,有很快的数据传输速度。     

基于PVDF压电传感器的足底压力测量系统

采用具有易加工、柔软、韧性好等特点的聚偏二氟乙烯(PVDF)压电薄膜传感器作为足底压力测量系统采集元件,详细介绍了系统的硬件设计,主要包括数据采集和数据通信两部分.数据采集部分包括电荷放大电路、滤波电路、后级调整输出电路;数据通信部分包括ATmega16单片机最小系统、无线数传模块、串口通信电路.实验结果表明:数据符合足底压力实际分布,达到了预期的设计要求.     

基于DSP和ADS8364的高速数据采集处理系统

开发了基于DSP和ADS8364的高速数据采集处理系统。该系统主要由信号调理模块、A/D转换模块、DSP处理器模块、CPLD逻辑控制模块和USB2.0通信模块组成。它能够在板卡上实现信号的采集及前端处理,并能通过USB总线与上位机通信,实现数据的存储、后端处理及显示。参考了虚拟仪器的设计思想,重点阐述了系统原理及硬件、软件的设计。     

压电振动传感器的前置放大电路设计

介绍一种用于压电振动传感器信号处理前置放大电路的设计,由差分电荷灵敏放大及带通滤波电路组成,实现对特定频率范围信号的处理及包括传感器连接在内的电脉冲信号自检功能。经电荷信号和B&K加速度传感器对敲击输出信号的测试验证,满足核电厂松脱件监测、转动设备振动监测对压电振动传感器输出信号的现场预处理技术要求。     

LZW数据压缩技术在USB数据采集系统中的应用

在基于DSP的USB主机数据采集系统中,针对DSP内部ROM和RAM存储空间通常不是很大的问题,本文应用LZW数据压缩技术对采集数据进行压缩处理,再通过USB总线将压缩数据传送到外部存储器(U盘、移动硬盘等),实验证明该方法较大幅度地提高了外部存储器的空间利用率和USB总线数据传输的效率。     

基于DSP和USB的高速数据采集与处理系统设计

介绍了一种基于DSP与USB的高速数据采集与处理系统,包括整个系统的硬件设计与软件设计。DSP控制整个系统完成CCD信号采集并进行小波变换去噪处理,FPGA协同DSP实现整个系统的地址译码和逻辑控制。主机应用程序通过USB完成与DSP的数据通信,实现整个采集的控制和数据显示。这种高速的数据采集与处理系统,可广泛地应用于各种智能仪表、自动化控制设备中,有着非常好的市场应用前景。     

基子DSP和USB的高速数据采集与处理系统设计

介绍了一种基于DSP与USB的高速数据采集与处理系统,包括整个系统的硬件设计与软件设计.DSP控制整个系统完成CCD信号采集并进行小波变换去噪处理,FPGA协同DSP实现整个系统的地址译码和逻辑控制.主机应用程序通过USB完成与DSP的数据通信,实现整个采集的控制和数据显示.这种高速的数据采集与处理系统,可广泛地应用于各种智能仪表、自动化控制设备中,有着非常好的市场应用前景.     

地震物理模拟系统设计技术

地震物理模拟系统主要由定位系统和数据采集系统组成。定位系统设计开发中应用FPGA可编程器件,实现了对光栅返回脉冲的噪声信号处理,可靠计数、锁存和同步信号的实时触发功能。采集系统采用USB2.0技术,实现对模拟地震数据的高速采集传输。     

自动测试和控制系统的一体化设计

按照OMAC技术规范和测量、控制、通信、计算机(MC3)一体化和数字化系统的思路,基于多DSP并行处理和FPGA技术,探讨了高性价比、开放性、模块化自动测试和控制系统(ATCS)一体化设计;对ATCS体系结构、开放性多轴运动控制器、压电陶瓷作动器电荷反馈控制器、大动态范围多种类传感器信号程控调理和实时采集处理模块及高性能数字信号处理机等模块进行了详细介绍,在工业自动化和数字化进程中具有广泛的应用价值.     

用于纳米通道单分子检测的数据采集系统的设计与实现[BT)]

针对纳米通道单分子检测系统的信号特点和对数据采集的采样精度、采样速率及实时性等要求,设计并实现了基于FPGA和USB2.0接口的数据采集系统;该系统以FPGA作为控制核心,包括数据采集模块、电压输出模块和USB接口电路模块;通过USB2.0接口与计算机连接,实现数据的实时采样和参数的在线配置;此外本系统还采取了低噪声设计;经过相关试验表明,该系统引入的噪声在1 mV内,能够稳定进行数据采集,且采集信号与电压输出信号同步传输,证明该系统能够满足纳米通道单分子检测系统对数据采集的要求.     

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.