SD卡的WinCE7.0 Bootloader设计与应用

针对WinCE7.0嵌入式系统开发过程中,通过以太网(Ethernet)来下载系统镜像的EBoot存在诸多不足的问题,本文实现了通过SD卡下载WinCE7.0系统的EbootSD。对WinCE7.0的Bootloader的架构、引导过程、实现方法进行了详细阐述,并结合TI公司的Cortex-A8处理器AM3359的Beaglebone开发板硬件特性,完成了Bootloader的移植工作,实现了通过SD卡下载WinCE7.0系统镜像程序的设计。测试结果表明,该Bootloader达到了设计目标。     

基于IntelPXA270的系统引导程序移植与实现

为了满足嵌入式操作系统与硬件平台配置的多样性和灵活性,要求设计引导程序Bootloader,实现基本硬件初始化和引导操作系统内核.系统总结了基于PXA270嵌入式系统引导程序的移植方法和步骤;介绍了引导程序Bootloader的设计和实现方法;讨论了位置无关代码在引导程序中的应用;简述了用于测试PXA270硬件器件的Bootloader扩展功能.该设计方法除用于完成Bootloader基本功能外,位置无关代码实现了程序的快速运行,扩展功能可以测试PXA270基本硬件设备.该引导程序Bootloader已成功运行于PXA270嵌入式平台,可提供类似系统开发的直接借鉴.     

基于Intel PXA27x的系统引导程序(Blob)移植与实现

随着嵌入式处理器Intel PXA27x在各种智能终端上的推广使用,基于这款处理器的Bootloader(Blob)的设计和移植也逐步转向实际应用。本文在分析基于PXA27x的Blob移植和启动过程关键问题的基础上,给出了为测试硬件平台而扩展Blob监控程序功能的一些建议,总结了成功开展类似移植的一般过程及模式,对类似系统的开发有直接借鉴意义。     

基于GNU工具的嵌入式Bootloader设计与开发

介绍了用GNU工具开发嵌入式系统Bootloader的基本原理、设计方法；设计了具有通用移植性能和复杂功能的Bootloader开发模型，修改较少的代码可以较容易地适用于不同CPU体系结构的嵌入式平台。该文为嵌入式系统Bootloader的开发提供了一个完全自由和免费、底层机制和原理清晰、开发模型扩展性能良好的解决方案。     

改进的Bootloader开发模型的研究与实现

Bootloader是嵌入式系统开发的关键步骤,本文设计了具有通用移植性能和复杂功能的Bootloader开发模型。该设计具有一定的通用性,可以广泛地应用到其它嵌入式平台上。通过在TQ6410目标板上的运行,结果表明该方案具有可行性。     

U-Boot 启动流程分析与S3C2410上的移植

Bootloader(引导加载程序)是嵌入式系统开发的关键环节之一,通过这段代码,可以初始化硬件设备,建立内存空间的映射图,从而将系统的软硬件设置成合适状态,以便为最终调用操作系统内核准备好正确的环境。U-Boot是一个开放源码的功能强大的Bootloader,具备烧写flash、以太网下载等功能,移植U-Boot可以为嵌入式系统的开发调试提供诸多方便。重点分析了与U-boot的启动流程相关的三个源文件,并介绍了S3C2410开发板上的移植实例。为在其他嵌入式处理器上进行Bootloader程序设计提供了参考。     

基于嵌入式S3C2440系统Bootloader设计与实现

Bootloader是嵌入式系统的一个重要环节,对不同的硬件平台,其Bootloader都不尽相同,因此设计Bootloader是嵌入式系统开发的难点;文中分析S3C2440嵌入式系统的硬件组成和u-boot源码对linux内核的启动流程,得出u-boot启动内核两个阶段必备阶段:第一个阶段是用汇编初始与具体硬件平台相关的操作等,第二阶段是用C语言编写复杂功能以及启动内核;以加载linux-2.6.22.6内核为例,根据u-boot启动内核两个阶段所做的工作,设计出适用于S3C2440嵌入式系统的精简Bootloader;通过实验表明,该设计的Bootloader成功启动linux内核,具有良好的稳定性,可靠性和简洁性。     

基于S3C44B0X的U-Boot的分析与移植

Bootloader是操作系统和硬件的枢纽,负责初始化硬件和引导嵌入式操作系统的内核。U-Boot是当前比较流行,功能强大而且成熟的Bootloader,可以支持多种体系结构。介绍了U-Boot的结构、功能以及启动工作机理。针对基于ARM 7TDM I内核的S3C 44B0X的开发硬件平台,对U-Boot进行了移植。     

U-Boot在S3C2440上的分析与移植

Bootloader（引导加载程序）是嵌入式系统开发的重要环节,它使得操作系统和硬件平台联系起来,对嵌入式系统的后继软件开发十分重要。介绍了当前嵌入式开发中功能强大、稳定可靠的引导装载程序U-Boot的特点、移植的过程,并且实现了包括下载内核、yaffs文件系统和启动Linux的功能,利用相应的命令下载内核、yaffs文件系统和启动Linux,证实了所移植的U-Boot的正确性。     

基于TMS320DM6467的嵌入式Linux操作系统移植的研究

为了应对日益复杂的嵌入式系统应用需求,本文提出在以微处理器TMS320DM6467为核心的视频转码硬件平台VPC6467上,移植嵌入式Linux操作系统的方案。在详细介绍VPC6467硬件平台和Monta Vista Linux特点的基础上,重点论述移植的总体思想和具体方法等,主要包括移植开发环境的搭建、引导程序(Bootloader)的移植与固化、内核镜像的编译和移植、Ramdisk文件系统的制作与移植。移植后的Linux系统操作方便,运行稳定,已作为视频转码应用程序的运行平台环境。     

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.