基于VNH3SP30的大电流直流电机驱动器的设计

设计了一种基于VNH3SP30组件的大电流直流电机驱动器．介绍了专用于电机控制的H桥组件VNH3SP30．并将该驱动器电路应用于某重点型号伺服控制系统中，实验表明，该电路具有驱动能力大、体积小、保护功能全，性能稳定等特点，可广泛应用于40V以下的大功率直流电机驱动的场合。     

TD340芯片在汽车电动助力转向系统中的应用

汽车电动转向助力系统的基本结构及原理、用于汽车电动助力转向电机控制的H桥,设计了一种基于TD340芯片的汽车转向助力电动电机驱动电路,并将该驱动电路应用于吉利某车型的电动助力转向系统中。实验表明,该电路具有驱动能力大、体积小、性能稳定等特点,可广泛用于汽车电动助力转向系统中。     

51单片机应用系统接口电路的设计

介绍一种用于５１系列单片机应用系统的接口电路，亦可用于其它单片机应用系统。该电路采用８２５５作为接口芯片，可外接简易键盘、ＬＥＤ显示器以及微型打印机，构成较简单的单片机应用系统。经实验表明：该接口电路简单、可靠、使用方便，对智能仪器、仪表或过程参数检测与控制装置的设计具有一定的参考价值。     

单片机系统通用接口电路的设计

介绍一种用于单片机应用系统的通用接口电路,该电路采用8255作为接口芯片,可外接键盘、显示器和打印机,以构成最简单的单片机应用系统.重点介绍了硬件电路的组成和程序设计.     

一种高速PCI数据采集处理系统的设计与实现

针对图像处理中数据采集与处理的现状,介绍了基于DSP和PCI控制器的高速数据的实时采集、存储和处理的方法,并分别对电路原理图的硬件设计和PCI接口的软件设计做了阐述.该系统主要采用了DSP芯片来实现各种数字信号处理的算法程序,PCI总线控制器来实现PCI总线接口,以及CPLD作为控制DSP与PCI之间能够正常进行数据传输的枢纽,从而实现了数据的高速、高精度处理,为图像采集与处理提供了新的方法.     

基于STN LCD驱动控制芯片的MPU接口电路的设计

设计一种应用于STNLCD驱动芯片中的可支持多种类型MPU的接口电路,该电路在整个芯片中用于为内部电路提供数据,为电路的正常工作提供所需时序,并在同类设计中率先支持I^2C总线协议。简单介绍了MPU接口电路的设计要求,重点描述了MPU接口电路中各个模块的设计。采用Verilog对所设计的接口电路功能进行了仿真验证,并且整个芯片用SMIC0．25μm工艺得到了实现。     

基于FPGA的1553B总线控制器设计与实践

设计了一种基于FPGA的1553B总线控制系统,用于RS-422接口和1553B总线接口之间的数字量转换和传输.文中详细阐述了该系统的硬件电路,BC模式配置和FPGA控制逻辑的设计方法,来说明系统功能的实现过程.采用FPGA作为主控制器,对1553B接口芯片进行了配置,给出了程序设计流程和控制时序.测试结果表明,该系统完全满足实际工程需要,具有很高的可靠性,并且已成功运用于某工程应用项目中.     

基于DDS芯片的信号发生及调制器的设计

本文首先介绍了DDS(直接数字合成)的基本原理,及AD7008芯片的组成结构和工作原理.之后介绍了基于DDS芯片AD7008的信号发生及调制器的设计思路,及其与工业控制计算机ISA总线的接口电路的设计,并分析了QAM、AM、FSK等几种通信领域中最常用的信号调制方式在该信号发生及调制器上的具体实现方法.     

用RAM作为通讯场所实现并行通讯

<正>用RAM作为通讯场所能够使这种主从系统迅速实现多组数据的井行通讯与传统的并行通讯相比,具有软件设计简单,通讯准确,通讯机之间无需协议应答信号,因而可以大大节约系统的通讯时间,尤其适合于快速的实时控制系统.以两片616 RAM和八片74LS245收发器为例,实现63路八位数据的快速并行通讯.硬件接口电路如图1所示.八片74LS245收发器作为开关使用,分别用于RAM的地址线和数据线的选通控制,其中芯片1,2,3,4,用于地址线,芯片5,6,7,8用于数据线.锁存器74LS74等芯片作为保存切换两片RAM的控制信息使用,构成了电路的存储,读取数据的控制口(在本例电路中该控制口地址为03FH).当从机单片机需要存储数据时,可先向控制口写入1或0,该信息通过锁存器,三态门,反相器分别控     

基于ATmega128的无线数据采集系统

针对电力系统远程数据采集和控制,采用新型嵌入式单片机Atmega128、数传电台MDS设计的无线数据采集系统。介绍了高速异步FIFO芯片SN74ACT7808和高速A/D芯片的性能及该采集系统的接口电路.介绍了以ATmega128为核心的远控单元的设计及该单片机与数传电台的串行通信和硬件接口电路.简单介绍了串口通信C语言编程方法。     

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.