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。     

第六讲 INTERBUS现场总线工业产品

根据INTERBUS－CLUB的统计，目前在全世界范围已有1 000个厂家生产2 000多种INTERBUS的模块。具体的产品目录请参考INTERBUS－CLUB的产品手册。这里仅重点介绍一下PHOENIX CONTACT提供的部分产品。 1 系统部件 INTERBUS的系统部件有基于PC的嵌入式PLC控制板、与PLC控制器相连接的总线控制板和系统软件。 1.1 基于PC的嵌入式PLC控制板 对于不同标准的PC总线和VME总线技术，PHOENIX提供了不同性能的嵌入式PLC控制板。这些嵌入式PLC控制板既可以作为主站工作，也可以作为INTERBUS系统的一个子站。它们…     

嵌入式PC的网络开发与应用

嵌入式PC已经开始在工业领域显示出它的发展优势．网络通讯是它的一个重要应用．具有网络功能的嵌入式PC使各种工业设备可以连接到Internet．从而充分发挥网络的优势，大幅度提高生产率．本文以嵌入式PC在SGX3．0数控测井系统下位机的开发为例，讲述了嵌入式PC的网络开发与应用．     

基于嵌入式系统的虚拟仪器设计

以工控计算机和PC为平台的虚拟仪器系统长期以来充当着智能测试系统的平台。随着后PC时代的来临，业界对仪器的个性化和小型化要求越来越高。嵌入式系统的发展和普及应用使得基于单板计算机和功能板卡的嵌入式仪器成为构建虚拟仪器系统的新思路。本文介绍了应用基于PC-104的嵌入式主板和功能板卡构建虚拟仪器系统的关键技术。     

嵌入式系统的技术发展和我们的机遇

综述了嵌入式系统的定义，发展历程，技术特点，发展方向和在后PC时代的市场前景，重阐述了嵌入式系统的核心硬件和实时操作系统技术，并讨论了发展和应用我国自主的嵌入式系统技术的有效条件，指出发展32位RISC结构的嵌入式CPU和LINUX操作系统是一种很好的途径。     

井口填罐监控系统中PLC和嵌入式PC/104+的通信实现

文章阐述了井口填罐监控系统的整体结构,主要介绍了井口填罐监控系统中PLC和嵌入式PC/104+的通信实现方式:PLC和嵌入式PC/104+编程软件的通信、PLC和嵌入式PC/104+监控程序的通信。该通信方法对相近系统的设计有着重要的参考意义。     

嵌入式构件技术探究

嵌入式网络视频监控系统是新一代的监控系统,它体积小易于布控、功耗低、稳定性高、具有良好的性价比,与传统的基于PC机的监控系统相比具有强大的优势。随着硬件的变革,嵌入式网络视频监控软件系统也需要从基于PC机的开发转移到基于ARM的嵌入式系统的开发上,嵌入式系统有不同于通用PC的诸多新特点,对嵌入式系统下视频监控系统开发提出新的要求。     

Linux在嵌入式系统中的应用

Linux系统不仅适合于服务器和PC台式机,还适合于嵌入式系统。本文描述了嵌入式系统的特色和如何在嵌入式系统中应用Linux。     

基于嵌入式的智能化与网络化的自动化仪表

从嵌入式系统在仪器仪表中应用的角度出发，介绍了软硬件协同设计的设计思想和各种嵌入式处理器．讨论了嵌入式Internet接入技术和实时操作系统对自动化仪表发展的影响，指出基于嵌入式的智能化、网络化仪表是自动化仪表的发展趋势。末给出了一个基于PC104的仪表系统架构。     

嵌入式：开源的新突破口——步入后PC时代

关于嵌入式系统的现状，可以引用Intel公司的一句宣传语——“计算无所不在”。是的，计算无处不在，嵌入式系统已经渗透到我们工作和生活的方方面面，我们也步入了所谓的后PC时代。     

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.