基于MCGS的C8051F020单片机驱动程序的设计与应用

简单介绍了MCGS组态软件和C8051F020单片机的特点.并以基于C8051F020单片机设计的厂房灯光控制器被背景,详细阐述了开发基于MCGS的C8051F020单片机驱动程序的方法和步骤,并简单介绍了C8051F020的程序设计,最后给出了测试情况.在实际应用中取得了良好效果.     

单片机多机通信中从机串口中断服务程序设计

论述了在单片机多机通信中从机侧带有数据校验和重发机制的串口中断服务程序的设计。首先介绍了单片机中串口的工作方式,然后给出硬件连接环境,最后在论述从机侧串口中断服务程序设计的时候给出了单片机多机通信中使用的数据结构、通信流程、从机侧串口中断服务程序流程图以及状态迁移图。     

基于8051单片机的1553B总线接口设计

1553B总线在航空航天领域得到了广泛的应用;在航天器上,以8051单片机为核心的电子设备经常作为1553B总线的终端使用;这里在总结型号经验的基础上,提出了8051单片机与1553B总线之间的接口设计的一些基本方法,包括硬件接口设计、通信协议设计和软件接口设计的方法;最后,分析了一个常见的软件问题并提出了解决办法;这些方法已在多个航天器上得到了应用,具有一定的通用性。     

基于Keil C51的软件看门狗系统设计

介绍了一种基于Keil C51环境的软件看门狗设计方法.通过设置程序、喂狗程序和中断服务程序的有效配合,解决软件模块的稳定性问题.设置程序在模块开始处对看门狗系统进行初值设定,喂狗程序在模块结束时进行参数设置.通过T0中断服务程序监视软件模块的运行,T1中断服务程序监视T0定时器的运行,设置程序监视T0和T1的运行,以达到看门狗系统的循环监视.此设计方法可以提高程序模块的稳定性,特别是对于顺序控制结构的软件尤为适用.     

单片机中断服务程序编程的一般方法

本文主要介绍单片机中断服务程序编写的原理和编程的一般方法,并介绍了中断服务程序的一般形式。     

8051单片机扩展外部中断源的设计方法

8051系列单片机仅有INT0和INT1两个外部中断源,这很难满足实际应用中的要求,在很多情况下需要对8051单片机的外部中断源进行扩展.叙述对8051单片机的三种扩展方法,以及各自的实现方法和优缺点,针对利用8259A进行外部扩展详细叙述了8259A功能和使用方法,并给出其在8051单片机中实现外部中断源扩展的方法.     

液压系统中压力及换向周期的微机控制

在液压系统加载试验中,必须对压力与作用次数进行控制记录。本文介绍一台以单片机为中央处理机的控制器,其软件组成为运行主程序、定时器中断服务程序、外部中断服务程序,检测显示与打印子程序。系统适用性强,可满足各项动作检测和记录要求。     

跟我学51单片机(二)——单片机内部定时/计数器和中断系统

上讲通过讲述用单片机控制一个外部的LED闪烁实验来向读者介绍了单片机的工作原理与开发流程.这一讲将介绍单片机内部非常重要的两个资源--定时/计数器和中断系统.通过该讲,读者可以掌握定时器的工作原理和单片机的中断系统.从而设计定时器计数程序和中断服务程序.     

基于Zigbee技术的CC2530定时器的应用与实现

CC2530是TI公司推出用来实现嵌入式Zigbee应用的片上系统,内部包含一个“增强型”工业标准的8位8051微控制器内核。介绍了CC2530定时器1的三种操作模式,并重点分析了定时器1在自由运行模式下中断服务程序的设计。     

一种中断信号产生方法在ARINC419收发系统中的应用

针对ARINC419收发系统设计时,单片机执行中断服务程序的时间门槛限制,通过分析ARINC419数据总线的数据通讯格式,提出了一种改变中断信号产生时机的方法;该方法利用复杂可编程逻辑器件的丰富资源,引入缓冲寄存器,将中断信号产生时间提前,为中断服务程序的执行获得充足时间;文中给出了应用该方法的具体步骤和中断服务程序,试验结果表明该方法非常有效.     

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.