单片机控制LED点阵显示原理及Proteus仿真

该文介绍了最简单的8×8LED点阵显示模块的显示原理,并通过单片机来实现对显示电路的控制,进一步分析了电路的设计和程序的设计方法,采用了Proteus仿真软件进行仿真、调试,最终完成了一个完整的电路设计和制作。     

基于单片机的LED汉字点阵显示系统设计

首先介绍了LED汉字点阵显示的设计思想及编码原理;接着介绍了基于89S52单片机的LED汉字点阵显示的硬件设计与软件设计;最后在Keil软件平台上编译了LED汉字点阵显示程序并在Proteus软件平台上实现了LED汉字点阵显示的仿真.     

基于单片机的LED点阵动态显示系统

介绍了基于AT89C51单片机的8×8 LED点阵动态显示系统。其中包括对单片机及8×8 LED点阵外围电路、显示原理、运行程序、仿真效果的介绍。LED点阵显示被广泛的应用在银行、商场、医院、车站、机场等公共场所,所以LED点阵显示的实应用性很强。     

动态移位显示屏的设计

以8×8点阵为基础,设计了一个动态移位显示屏。全屏由20块8×8点阵LED显示模块组成,显示采用动态显示,使文字或图形能实现静止、移入移出等多种显示方式。文中详细介绍了LED点阵显示的显示原理、硬件设计和软件设计。     

Proteus在LED点阵动态显示屏的设计与应用

点阵LED显示动态图形有十分重要的实际应用价值。本设计详细介绍了LED点阵汉字滚动显示屏的系统硬件电路设计和软件设计的过程和思路,利用嵌入式系统仿真软件Proteus实现对16×16点阵汉字分批显示的仿真设计。用Keilc软件编写C语言源程序,并给出了仿真运行结果,本设计具有结构简洁、功耗低、成本低、扩展性能好等优点。     

一种可扩充LED点阵显示模块及其驱动设计

详述单片机在可扩充(最多8位)16×16LED点阵显示模块中的开发应用,包括LED点阵显示硬件电路的设计及各个电路的原理及功能、单片控制电路及其与LED点阵的接口驱动电路的设计、单片机控制程序的设计及调试.     

LED点阵书写显示屏的FPGA实现

系统以Cyclone系列的FPGA核心板EP1C60240C8作为控制器,采用自制由光敏三极管构成的光笔,触发自制的32×32点阵LED书写显示屏,实现"点亮、划亮,书写、反显、整屏擦除"等书写显示功能.该系统主要由五个模块组成:光笔模块,LED点阵模块,主控模块,点阵驱动模块,数码显示模块.系统具有集成度高、稳定性好、设计灵活和设计效率高等优点.     

基于FPGA的LED点阵书写显示屏的设计

要阐述利用FPGA＋51单片机核的方法实现32×32LED点阵书写显示屏的设计思想和系统实现。通过FPGA作为点阵LED显示屏控制器,高速扫描点阵屏,由光敏二极管电路制成感光光笔。系统实现当光笔触及LED点阵模块表面时,在显示屏上依次实现“点亮、划亮、反显、整屏擦除、笔幽擦除、连写多字、对象拖移”等书写显示功能。     

基于微机并行口控制的LED显示屏

在选用成品的32×64点阵LED显示模块基础上．尝试利用软件的方法实现LED显示屏控制卡的功能。利用微机并行口通过编程串行输出显示数据和控制信号,编制LED显示与刷新控制程序．实现基于微机并行口控制的LED显示屏。     

LED点阵显示屏的矩阵模型特性研究

LED点阵显示屏是利用发光二极管点阵模块和像素单元组成的平面式显示屏。以单片机为核心控制器、以基本单元模块8×8点阵为主要分析对象,阐述了LED显示屏点阵结构的矩阵分布特征、显示扫描时元素点取值的矩阵特性以及点阵大小不同的显示屏在扩展中呈现的矩阵规律性。结果表明：在显示控制技术和产品设计方面应以矩阵模型特性为主来有效控制电子领域广泛使用的LED点阵显示屏。     

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.