基于嵌入式系统的煤矿井下协议转换器的设计与实现

为了将煤矿井下遵循不同协议的安全监控设备接入同一个网络,文章介绍了一种基于嵌入式系统的协议转换器的设计,阐述了该转换器的硬件设计和软件实现。实际运行表明,通过加入嵌入式协议转换器,简化了煤矿安全监控系统的硬件复杂度,提高了系统的集成度和可扩展能力,为系统的维护和升级带来了方便。     

OSB轧辊双频淬火机床监控系统的改进设计

为提高轧辊加工质量的稳定性,在原引进设备的基础上,改进并设计了一种全数字控制的OSB双频淬火机床监控系统.详细阐述了系统的组成、硬件配置和软件设计,并以报表形式记录和分析了系统实际运行过程中的各项数据指标.改进后的双频监控系统采用S7-300 PLC分站式结构,以Profibus-DP总线联网现场设备,通过Fame View组态软件在上位机上反映各设备的实时工作状态,体现了系统较高的数字化集成度.     

通过无线收发芯片实现的单片机DCTMS技术

介绍无线发收芯片构成的窄带双向数字通信电路和通过该电路实现的单片机DCTMS的结构、工作原理、设计方法和性能,并给出应用的实际结果.该方法技术集成度高、通用性强,且硬件价格低廉,有较好的应用前景.     

基于单片机的智能流量控制系统

随着电子技术发展,自来水及水暖收费管理也将朝着电子化、信息化方向发展.本文设计了一种基于单片机控制的低成本,高可靠性流量计费式供水控制系统,通过使用涡轮流量传感器,将用户实际用水量转化为电脉冲,送入单片机,从而实现智能流量控制.该系统集成度高、可靠性强、功耗低.本文主要介绍了系统硬件结构设计和软件思路.     

某导弹发控仪模拟器计时电路的设计与实现

针对某导弹发控仪模拟器实时控制电路集成度低,难以提高性能的问题,提出了基于AT89C52单片机实时系统的设计方法;分析了导弹发控仪模拟器计时电路的功能和原理,介绍了AT89C52单片机的性能特点,给出了具体的硬件电路和软件设计流程图,分析了设计中的难点;该设计充分利用AT89C52的内部资源,硬件电路实行最少配置,结构简单,能够实时监测发控仪模拟器各触发信号,产生实时控制信号,形成实时控制母线,完成对发控仪模拟器各工作状态的实时控制;该设备性能良好,集成度高,可靠性高,为同类产品的研制提供了一个典范.     

基于DSP的USB设备固件程序开发

本文介绍了一种采用TMS320VC5509A自带的USB模块来实现USB数据传输的方案,对该DSP内部的USB模块的构造及其传输原理做了分析.详细的介绍了如何利用CCS内部集成的片级支持库(CSL)来实现USB设备固件程序的设计,并给出了相关的部分代码.该方案大大降低了系统硬件设计的复杂度和调试的难度,提高了系统的集成度和稳定性,适用于便携式设备中.     

基于ARM的混凝土搅拌站自动控制系统

根据混凝土搅拌站的实际情况和配料设备对配料控制系统的性能要求,本文主要介绍了一种混凝土搅拌站自动控制系统,提出了以工控机为上位机,以集成度高,运行速度快,抗干扰性能好的LPC2114嵌入式控制器为下位机的总体设计方案,讨论了配料控制器的设计原则,介绍了硬件系统设计、软件系统设计和称重配料控制算法,提供了一种实用的搅拌站自动控制系统解决方案。该系统工作稳定可靠、智能化程度高、配料精度高。     

算法实现FSK来电软件解码

比较了来电显示硬件解码和软件解码,详细介绍了算法FSK来电解码的数学原理和程序实现,解释了在实际实现中要注意的关键环节,在实际的交换机系统中实现了理想的解码效果和高度的系统集成度,达到了预期的良好效果。     

AST和COMPAQ主机维修实例

AST、COMPAQ计算机在国内享有很高的声誉,硬件集成度高、故障率低、兼容性好,受到广大电脑用户的好评。但集成度高也有不尽人意之处,就是当集成在某个板上的接口电路出现故障时,维修起来非常麻烦,以至于没有相当硬件维修能力的用户只好望而止步,或者送回各公司指定的维修中心,开销之大是可想而知的。 笔者在使用AST、COMPAQ机器时,遇到过VGA接口、硬盘IDE接口、打印机并行口故障,而仅仅花去一二百元钱,就使机器恢复了正常。 1.COMPAQ M、E系列机并口故障的排除 (1)M系列主机故障     

存储器24C08的串口读取与写入程序

<正>24C08是一种采用I2C总线结构的小容量集成存储电路,多见于大屏幕彩电、手机电脑等电子电路之中。新型的电子产品集成度越来越高,这在实际使用中大大降低了硬件电路故     

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.