VxWorks在AT91FR40162上的BSP定制

讨论BSP的概念以及ARM芯片AT91FR40162的特点;研究在BSP定制过程中需要清楚的VxWorks映像的生成和种类,以及系统的启动流程;着重研究VxWorks操作系统在AT91FR40162上的BSP定制。     

BSP在MPC8270硬件平台上的研究与实现

该文简要的介绍了嵌入式实时操作系统VxWorks及BSP基本概念,描述BSP在VxWorks系统中所处的层次,分析BSP的文件结构,以MPC8270的单板计算机为例,阐述BSP的开发和实现过程.     

基于MPC8270的VxWorks BSP的移植

针对嵌入式实时操作系统的要求,文中详细分析了在整个系统结构层次中VxWorks所处的位置和所起承上启下的作用,具体介绍了VxWorks的主要功能,并深入阐述了VxWorks的启动过程。同时,对于不同的目标硬件平台,VxWorks需要不同的板级支持包BSP来实现对其的板级接口,从而实现平台的可移植性;进一步地,详细说明了作为实现操作系统VxWorks硬件平台独立性的设备接口的板级支持包BSP的具体功能与结构,这样,程序开发者可以在完全不熟悉目标平台具体硬件的情况下,只在BSP中相应位置添加配置参数就可以完成底层硬件配置工作,最后讲述了BSP的主流设计方法。     

VxWorks系统的BSP设计与实现

BSP(Board Support Packet)是介于硬件和实时操作系统VxWorks之间的底层软件开发包,为VxWorks系统提供了标准的硬件接口函数,保证了VxWorks系统能够运行在不同的硬件平台上.介绍了BSP的概念,并以嵌入式微处理器MPC8280构成的硬件平台为例详细介绍了BSP的开发过程.     

VxWorks在S3C2410上的BSP设计

VxWorks是美国WindRiver公司设计开发的一种嵌入式实时操作系统,可移植性是对嵌入式操作系统的一个重要要求,VxWorks BSP(板极支持包)正是实现可移植性的中间层软件,使操作系统的应用代码独立于具体硬件。本文介绍了Vx- Works BSP的开发,分析了VxWorks的启动过程,给出了基于三星S3C2410处理器开发板的BSP设计以及VxWorks的映像编译下载,其中重点介绍了BSP中几个重要文件和函数的设计,最后提出了开发调试过程中的几个注意点。     

基于USBKey和BSP的嵌入式系统安全方案*

针对目前嵌入式系统安全机制多采用单一口令的不足,提出了一种在VxWorks环境下基于USBKey和BSP的安全解决方案.该方案通过分析VxWorks BSP的功能及启动机制,在BSP中实现了基于USBKey的身份认证,同时使用USBKey实现对系统正常运行期间的安全保护.     

基于VxWorks的BSP技术分析

结合嵌入式操作系统设计的主要特点,针对486目标机上VxWorks的定制,运用其BSP技术解决了移植过程中底层硬件与上层软件无关性的问题。描述了BSP的概念和启动流程,介绍了BSP设计过程,并结合实际工程给出了486目标机下VxWorks的定制及应用程序加载方法。     

实时操作系统中的板级支持包BSP

对嵌入式实时操作系统的板级支持包BSP和PC机操作系统中的BIOS进行比较;分析BSP和设备驱动程序(drivers)的关系,重点指出板级支持包是基于处理器类型,而设备驱动则是基于具体的操作系统;结合Wind River公司的实时操作系统VxWorks给出编写BSP的具体流程.     

国产高可靠控制器BM3803MG的BSP设计

以自行研制的某型号BM3803MG系统主控板为例,介绍了Micrel公司生产的以太网接口芯片KSZ8851-16mll在VxWorks中BSP的设计过程,并总结了基于BM3803MG与VxWorks的BSP的设计方法。     

基于ARM和VxWorks嵌入式系统软件设计技术

基于S3C44B0X ARM7处理器和VxWorks操作系统,对无线数传装置进行了设计.该系统由核心处理器板、LCD、键盘、数字信号处理器件、声码器等组成.软件设计的结构和主要内容包括编制BSP程序启动并加载VxWorks、主控程序等.在设计过程中采用片上资源丰富的ARM处理器和具有高效的实时任务调度和中断管理的强实时操作系统VxWorks.本文主要从几个关键主题描述S3C44B0X VxWorks BSP定制工作.     

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.