构建嵌入式Linux应用开发环境

嵌入式产品的大量应用和linux系统的日趋完善,使嵌入式linux系统的开发得到广泛的重视.为了实现在Linux环境下编程,必须首先构建嵌入式Linux系统下的交叉编译开发环境.本文详细叙述了嵌入式Linux系统环境所要涉及的几个关键问题及主要步骤.     

基于嵌入式Linux系统的应用程序开发

嵌入式系统和Linux的有机结合,成为后PC时代计算机最普遍的应用形式。由于嵌入式Linux具有天生秉承的优势,有越来越多的程序员投身于嵌入式linux系统应用程序的开发,本文结合开发实例介绍了在嵌入式Linux系统上开发应用程序的过程。     

Linux内核的嵌入式系统裁减以及LCD驱动的实现

本文主要描述了如何将linux2.6的内核裁减为嵌入式Linux系统的过程,并在S3C2410开发板上移植了嵌入式Linux 2.6.11.7内核系统,并说明了如何进行LCD驱动程序模块化编程及如何将驱动程序静态加载到系统内核之中。     

嵌入式Linux中Cramfs根文件系统的移植

Linux内核在系统启动期间的最后操作之一就是挂载根文件系统.根文件系统是嵌入式Linux系统不可或缺的重要组成部分,而Busybox是制作嵌入式linux根文件系统的有效工具.详细介绍使用busybox制作Cramfs根文件系统的一般方法.并将制作的Cramfs根文件系统下载到目标板运行正常,很好地实现了Cramfs...     

嵌入式Linux快速启动技术综述

Linux应用于嵌入式系统一般都有快速启动的要求,文中首先分析Linux系统的启动过程,然后基于嵌入式应用深入分析Linux系统的快速启动问题,总结了嵌入式linux的快速启动主要技术实现并对这些方法的优势与不足等进行了探讨。以求能够为嵌入式系统快速启动设计提供参考。     

基于状态保持恢复的嵌入式Linux快速启动方法的研究

提高嵌入式设备的启动速度对嵌入式Linux系统的应用和发展具有重要的意义,本文针对嵌入式Linux系统,分析了其正常的启动流程;并在现在加快系统启动速度方法的基础上,提出一种新的嵌入式Linux系统启动加速方法,并把这种方法应用到具体的嵌入式板卡上验证,取得了明显的效果。     

轨道交通实时以太网交换机启动性能的分析与优化

轨道交通实时以太网交换机作为新一代列车通信网络的重要组成部分,保障了列车状态信息与控制命令的交换和传输。实时以太网交换机基于嵌入式Linux系统构建,系统启动包括BootLoader启动、内核镜像加载、内核启动、用户空间初始化4个部分,其启动耗时直接影响着交换机甚至整个列车通信网络的性能。通过对嵌入式Linux启动过程与JFFS2,UBIFS等文件系统在嵌入式系统上挂载耗时的研究与分析,针对交换机启动过程提出相应的加速策略。采用内核裁剪、调整文件系统类型与优化系统启动参数等优化策略,使交换机的启动性能大幅提升。实验表明,交换机系统的启动时间从原有的26.69s减少至7.15s,启动时间减少了73.2%。     

基于linux嵌入式系统的研究

从linux操作系统,嵌入式系统,采用linux作为嵌入式系统的原因,linux嵌入式系统的组成,linux嵌入式系统开发平台和开发环境五个方面对linux嵌入式系统进行了较深入研究.在此基础上,根据863计划,以及当前国家对自主操作系统的大力支持,指出了开发linux嵌入式系统的必要性.     

基于Linux的RIP路由器实现

Linux卓越的网络系统功能和微内核设计使它在嵌入式系统的开发中也有非凡的表现,目前很多网络设备都是基于Linux内核的。文章主要讲述在X86硬件平台下,结合linuxkernel2.4系统环境开发RIP路由器的基本原理及实现的三个主要环节——嵌入式linux的构建,命令行接口(CLI)实现,RIP路由协议实现,同时也给出了一些针对RIP路由协议的优化方法。     

井深测量仪中DSP与ARM间的USB设备驱动实现

USB总线是一种快速、双向、同步、低成本、动态可连接的串行总线,其驱动程序是Linux内核的一个重要组成部分。随着Linux操作系统的广泛应用,特别是嵌入式设备的大量出现,USB驱动程序的编写越来越显得重要了。本文实现了基于DSP平台的USB从机固件开发以及基于ARM下嵌入式linux的USB主机设备类驱动开发。     

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。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

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     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

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.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.