无线数据传输在LED显示屏系统中的应用

设计了将基与射频技术的无线通信模块nRF905应用到LED显示屏的控制系统中,实现了LED显示屏系统的无线数据传输。文章对以ARM处理器LPC2124为控制核心的LED显示屏系统设计、无线数据传输的硬件和软件实现进行了详细阐述。     

基于单片机的旋转式LED广告屏设计

基于单片机的旋转式LED广告屏主要由主控芯片外围电路、电源模块、无线通信模块、数据存储模块、显示屏驱动控制模块、直流电机驱动控制模块、串口通信模块组成。采用STC12C5616AD作为主控芯片,两列发光二极管对称地排列在圆周上作为显示屏。通过无线通信模块接收无线射频信号,由显示屏驱动控制模块驱动发光二极管工作。本设计具有低成本、高亮度、性能稳定的特点,用户还可自动遥控切换画面,显示屏信息录入也非常方便。     

基于ARM11的无线彩色LED显示屏的控制系统设计

针对彩色LED显示屏的实际应用需求,结合嵌入式技术、视频压缩技术、无线传输技术;设计了一种可靠性高、成本低的嵌入式无线的彩色LED显示屏的控制系统;系统选用S3C6410微处理器作为主控制器,利用无线Wi-Fi接收上位机经过H.264压缩的视频信息,并进行解码,最后送入基于FPGA的彩色LED显示屏扫描系统显示;测试结果表明,系统设计合理,无线传输信号较强、支持IEEE 802.11b/g从1Mbps到最高54Mbps所有的通信速率,运行稳定,能进行较短距离的无线视频数据传输。     

信号灯指挥机器人的设计

本设计涉及一种信号灯指挥机器人,包括机器人本体和信号标示区域,所述机器人本体包括灯罩、警示灯和LED指示灯,所述信号标示区域包括LED闪光灯和信息提示显示屏,所述信息提示显示屏上安装有LED闪光灯,所述LED闪光灯固定在灯罩内,所述信息提示显示屏位于灯罩内,所述信息提示显示屏为LED显示屏.本设计通过设置灯罩和LED指示灯有助于安装交通信号灯并对灯具防护,通过设置LED闪光灯和信息提示显示屏有助于增加灯具灯光提示效果并显示警示或交通信息,且结构简单,操作方便,经济实用.     

多文种LED柜台广告显示系统

广告显示系统包括放在柜台上的LED显示屏和在微机中的显示信息编辑处理软件两部分组成。由编辑处理软件将显示信息变换成点阵数据，经RS232串口装入LED显示屏后，显示屏脱离微机，在内部单片机软件控制下，显示点阵数据。     

我国LED显示技术和发展展望

进入新世纪,LED显示屏的技术和产业都取得了长足的发展,作为重要的现代信息发布媒介之一,LED显示屏在证券交易、金融、交通、体育、厂告等领域被广泛地应用.伴随社会信息化进程的推进,LED显示屏技术也在不断地推陈出新,其应用领域也愈加广阔.本文主要介绍我国LED显示屏产品的主要技术状况,总结LED显示屏产业的发展情况,并对未来LED显示屏技术和产业的发展进行分析和展望.     

短距离无线通信技术及其融合发展

随着我国科学技术发展速度的不断加快,通讯技术水平也在不断提升。当前,我国的短距离无线通信技术愈加成熟,为人们的日常生活带来了诸多便利。短距离无线通信技术的有效应用不但提高了人们信息交流的效率和质量,同时还避免了人们在相互交流过程中出现的信息限制问题。基于此,笔者重点针对短距离无线通信技术的具体应用及其融合发展展开了分析和论述。     

短距离的信息传输中的无线通信技术分析

随着时代的发展和社会经济的进步,短距离的信息传输也被人们广泛的使用;在长期的使用当中,人们发现以往的短距离传输方式存在着很多的弊端,那么就需要在短距离的信息传输领域引进更加先进的无线通信技术,从而不断的提高人们的工作效率,满足人们的使用要求。本文简要分析了短距离的信息传输中的无线通信技术,希望可以提供一些有价值的参考意见。     

基于ZigBee无线网络技术的电子站牌设计

为提高公共交通服务的质量,提出一种基于ZigBee无线网络技术实现的电子公交站牌系统。该系统利用无线通信技术对公交车进行到站检测和信息传递,站点将公交车到站的信息送给主控系统进行处理,并利用LED指示灯进行指示,同时通过Zigbee通信技术实现站点之间的信息传递,达到公交车运行信息在整个运行线路的显示,并在每个站点设计点阵式LED显示屏,实现公共信息显示,为人们出行提供便利。     

LED点阵显示系统

随着信息技术的发展,LED显示屏已成为当今社会一种常见的信息发布平台,它被广泛应用于室内外需要显示信息的场合,例如户内外公共场所广告宣传、机场车站旅客引导信息、公交车辆报站系统、证券与银行信息显示、餐馆报价信息豆示、高速公路可变情报板等。本文主要介绍了LED点阵的显示原理,点阵LED显示屏构成部分,然后主要研究了LED点阵显示屏系统的软硬件设计,主要应用的主控制器是单片机AT89S51,而且可以实现中英文字符的动态显示。     

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.