基于LINUX的嵌入式Email系统的设计与实现

嵌入式Email系统是类PC嵌入式系统,是嵌入式操作系统及其应用软件的一个重要组成部分,但是现有PC上的嵌入式Email系统都不能适应类PC嵌入式系统的硬件环境要求。文中采用了一种新的构建嵌入式Email系统的方法,设计与实现了清华嵌入式Email系统,可根据各种类PC嵌入式系统的不同要求进行定制。首先,论述了类PC嵌入式系统的硬件平台对嵌入式Email系统的苛刻要求,其次,描述了清华嵌入式Email系统的体系结构,接着,讨论了清华嵌入式Email系统的实现机制与原理,以及系统模型,最后,给出了嵌入式Email系统的特点。由于采用了现在流行的一种开放源码的组件,使得整个系统功能完善,并能够完全符合类PC嵌入式系统的要求。嵌入式Email系统已经在自主研制的掌上电脑HPC和交互式网络电视上成功地运行。     

嵌入式PC远程水位采集系统的实现

本文讲解了一个嵌入式PC远程水位采集系统的设计思路和实现方法。该系统的硬件由嵌入式PC机构成．而软件的编写和使用却与普通PC相同，并用Delphi编程，运行在仅有约23Mb大小的轻量级Windows98下。     

嵌入式系统及其邮箱通信的实现

随着网络的迅速发展和后PC时代的到来，嵌入式技术广泛应用于路由器、信息家电、通信工具，如何搭建起一个嵌入式系统并实现它与计算机的通信，成为一项关键技术，该文介绍了一种嵌入式系统，在嵌入式实现操作系统VxWorks上实现了单板的邮箱通信、灵活配置，实时监控。     

嵌入式电子信息产品检测信息采集系统的设计

给出了嵌入式电子信息产品检测信息采集系统软硬件设计方案.在综合考虑节点性能、功耗及成本的基础上,采用TI的无线SoC单片机CC2430,结合相应差分/平衡天线构成节点主控模块;采集节点上设计DS18B20、电位器、按键等实现信息采集,主控节点通过RS232与PC终端实现数据传输,并维护本采集网络.软件上,设计实现了点对...     

基于PC/104节点与1553B总线互联的设计

1553B总线通信可靠性高,PC/104嵌入式计算机采用层叠栈接方式可扩展能力强,适宜设计复杂的控制节点,因此提出了采用CPLD连接BU-61580芯片和PC/104计算机,实现了基于PC/104的1553B总线的方案,并分别对节点的硬件和软件实现进行了的叙述.     

一种软硬结合的嵌入式系统远程调试方法

介绍一种软硬件相结合来实现嵌入式系统远程调试的方法。其主要思想是，通过使用一个程序将串口和Telnet协议进行转换，主机通过Telnet从远端访问与嵌入式系统用串口直接相连的PC机，从而间接访问到嵌入式系统，获得调试信息、发送指令和更新固件；同时，通过附加的硬件电路，完成远端对嵌入式系统的电源和I／O的控制，从而获得更为全面的调试手段。     

基于RS-485总线的智能家居系统

近年来智能家居系统飞速发展,但是大多数功能欠完善,同时成本高昂。针对这种情况,介绍了基于RS-485总线网络,以嵌入式系统作为主设备,传感器接入模块作为从设备的智能家居子网系统,并给出了总体结构图和硬件设计电路图。提出了避免多个接入模块和嵌入式中继系统的串口通信协议和节点通信冲突的方法。最终实现了以PC机为家庭网关的基于RS-485总线的智能家居系统。     

多线程技术在嵌入式数据采集系统中的应用

讨论了多线程技术在嵌入式数据采集系统中的应用，给出了PC机与嵌入式计算机系统的多线程串行通信的实现。     

嵌入式系统硬件平台的软PLC实现方法

嵌入式软PLC技术是由软PLC技术和嵌入式系统结合而产生的技术,它继承了嵌入式系统体积小、反应快的优点,同时又克服了传统PLC的不通用性和软PLC的PC硬件对工业现场环境的适应性差等弊端。嵌入式软PI,C借助嵌入式系统的硬件平台,用软件的方法实现标准PLC的功能。本文构造了基于RT—Linux操作系统的嵌入式软PLC结构,介绍了系统的软硬件体系以及其实现方法。     

嵌入式系统硬件平台的软件PLC实现方法

嵌入式软PLC技术是由软PLC技术和嵌入式系统结合而产生的技术,它继承了嵌入式系统体积小、反应快的优点,同时又克服了传统PLC的不通用性和软PLC的PC硬件对工业现场环境的适应性差等弊端.嵌入式软PLC借助嵌入式系统的硬件平台,用软件的方法实现标准PLC的功能.本文构造了基于RT-Linux操作系统的嵌入式软PLC结构, 介绍了系统的软硬件体系以及其实现方法.     

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。     

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.