用NOR Flash建立VxWorks TrueFFS文件系统

详细说明了嵌入式系统中常用的NOR Flash存储器建立VxWorks TrueFFS文件系统的方法。首先配置完整的DOS文件系统支持,包含核心TrueFFS组件和翻译层组件;然后编写MTD层和Socket层驱动程序;最后在TrueFFS的NOR Flash驱动上挂接VxWorks DOS文件系统,并进行了简单的测试。     

嵌入式操作系统VxWorks的TrueFFS的实现

分析了VxWroks的TrueFFS文件系统的结构及其在VxWorks操作系统下建立TrueFFS的方法,详细讨论在VxWorks下建立文件系统的过程,并实现了在SST39VFl60上建立TrueFFS文件系统。     

TrueFFS上VxWorks应用程序的启动及动态更新

介绍VxWorks系统中基于TrueFFS的应用程序启动及动态更新的实现方案,详细阐述了TrueFFS的构建方式及bootrom代码的改进方法,并提供了主要的设计流程。本方案在铁路牵引自动化系统产品中得到了实际应用。     

基于MPC837x的FCM接口驱动开发

MPC837x微处理器通过其特有的FCM接口实现与NAND Flash的无缝连接。基于VxWorks和MPC8379E嵌入式系统开发平台,分析MPC837x微处理器FCM接口传输机制和VxWorks的TrueFFS文件系统驱动架构,介绍FCM接口下的NAND Flash设备的驱动设计及TrueFFS文件系统接口驱动的实现。基于层次化的驱动设计,使得FCM接口驱动很容易移植到其他的嵌入式系统。     

基于INTEL StrataFlash在VxWorks上构建TrueFFS文件系统

本文以Intel28F320J3A StrataFlash为例,介绍了在实时操作系统VxWorks上构建TrueFFS文件系统的过程,为嵌入式系统的开发提供了在flash上存储程序和数据的一种实现方法,基于此方法,可以方便地为用户提供在线升级等功能。     

基于NandFlash文件系统的优化设计

NandFlash具有存储密度高、容量大、价格低廉等优点,因而在嵌入式系统中广泛采用。本文介绍了一种基于NandFlash文件系统的优化设计。设计中综合考虑了NandFlash和嵌入式系统的特殊性,在ARM嵌入式系统中实现了对数据和存储空间的有效管理。     

Flash文件系统分析及其在VxWorks中的实现

简要分析了Flash 存储介质的特点,在此基础上阐述了传统文件系统应用在Flash 上的局限性,以及现有的解决方案。重点探讨了为Flash 设计的文件系统TrueFFS 的运行机制,并给出其在VxWorks中的具体实现方式。测试证明TrueFFS 文件系统有良好的性能,提高了Flash 设备的使用寿命。     

VxWorks内核技术分析及航天应用实践

分析了针对SPARC(Scalable Processor ARChitecture)体系的VxWorks5．4版本的内核源代码，重点讲述了内核结构和中断管理两个部分。论述了在空间应用中使用文件系统的必要性和可行性以及VxWorks对空间应用中使用文件系统提供的支持，提出须重点研究VxWorks提供的支持FLASH存储介质的TrueFFS文件系统。最后通过把VxWorks移植到预研用的目标板上完成了航天应用的实践。     

基于TrueFFS的VxWorks映像在线升级设计与实现

针对嵌入式系统传统升级方法的不足,提出一种基于TrueFFS的嵌入式系统在线升级解决方案,实现了不需仿真器而直接通过网络在线升级VxWorks映像的功能。首先描述该方案的总体框架和工作原理;接着讨论实现该方案所要解决的关键技术;最后通过实例介绍该方案的技术实现过程。目前该方案已成功应用在项目中并取得满意的效果。     

基于VxWorks的矿用网络化分站的设计和实现

分站是煤矿安全监测监控系统的关键,传统的基于8／16位单片机的分站已经成为制约煤矿监控系统发展的瓶颈。基于VxWorks的网络化数据采集分站采用32位ARM处理器,兼有嵌入式网关的功能,能够汇接其它监控系统的信息,并且使用TrueFFS闪存文件系统和嵌入式Web Server支持远程管理和系统在线升级。现场应用表明具有很好的实时性和可靠性。     

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.