基于UCLINUX的嵌入式系统设计

本文讨论了嵌入式linux-uClinux的特点,并阐述了如何构建uclinux开发环境,举例说明了,如何在uclinux上开发应用程序.     

嵌入式数据采集平台与网络部分软件设计

本文研究的是基于ARM9的32位高端嵌入式微处理器和嵌入式操作系统内核,设计新型数据采集系统平台.是得到重庆大学创新实验室资助的研发项目.开发软件在uclinux操作系统下进行,本文详细介绍了uclinux开发环境的建立及编译运行、RS232串口模块和以太网模块的软件设计.     

ARM嵌入式系统软件实时时钟的设计

本文使用PCF8563芯片为嵌入式系统提供一个独立的实时时钟,它独立自主地运行,CPU从它那里获得时间信息。文中简介了嵌入式ARM处理器和I2C总线的通讯协议;通过uclinux的交叉编译、移植和烧写uclinux内核,在UP-NETARM3000上成功的运行uclinux系统;在移植的uclinux系统上挂载NFS文件系统,运行其中的应用程序;并通过C程序在uclinux下实现了对PCF8563的读写功能,成功地添加了实时时钟。     

ARM嵌入式系统软件实时时钟的设计

本文使用PCF8563芯片为嵌入式系统提供一个独立的实时时钟,它独立自主地运行,CPU从它那里获得时间信息.文中简介了嵌入式ARM处理器和I2C总线的通讯协议;通过uclinux的交叉编译、移植和烧写uclinux内核,在UP-NETARM3000上成功的运行uclinux系统;在移植的uclinux系统上挂载NFS文件系统,运行其中的应用程序;并通过C程序在uclinux下实现了对PCF8563的读写功能,成功地添加了实时时钟.     

嵌入式操作系统移植的软件仿真研究

嵌入式系统开发要依赖真实的硬件平台,所以进行开发的成本较高。本文研究用软件仿真的方式来模拟各种硬件开发平台,使得开发者和学习者在模拟环境中进行嵌入式操作系统的移植工作,为在硬件平台上的移植以及后续的开发工作打下良好的基础。本文分析了常见的仿真平台,并给出uclinux在Skyeye上的移植过程。     

基于uCLinux系统的图形界面研究与实现

将嵌入式Linux应用至目标设备，并开发出优秀的人机交互界面，是嵌入式开发的关键技术之一。探讨了嵌入式图形界面国内外研究现状，通过比较，提出了在uclinux系统下采用MiniGUI开发图形界面应用软件的一般性实现方案，并重点分析了移植MiniGUI到目标板的关键技术。并最终在农业数据采集设备上实现了图形界面。     

嵌入式Linux下可插拔输入驱动机制研究

本文介绍了嵌入式linux下的输入驱动接口,详细分析了输入驱动中如何实现可插拔机制,描述了USB人机接口设备和可插拔输入模块的接口,最后给出了一个我们将uclinux下ep93xx触摸屏驱动改造为支持可插拔输入机制的实例及改造要点。     

基于嵌入式WEB的远程监测系统研究

本文介绍了一种可用在Internet上的远程监测系统,由嵌入式WEB服务器采集现场数据,观测者可在个人电脑上通过浏览器查看。对uclinux的移植、Boa服务器的配置、开发环境的搭建以及CGI程序的编制方法等进行了分析,对嵌入式系统的传感应用做了较为深入的研究。     

基于MCF5272模块的uclinux多协议路由器设计

主要研究了基于MCF5272模块的uclinux多协议路由器实现方案。由于多协议路由器网络拓扑中是采用不同路由协议的独立AdHoc网络。系统采用MOTOROLA推出的一款高集成度的32位ColdFire微处理器MCF5272为主模块，并成功将uclinux操作系统移植到目标板上，在实际工程应用中有较好的便携性和移动性。     

基于ARM7与uclinux的嵌入式全自动生化分析仪控制系统模型

提出了一种新的基于ARM的嵌入式全自动生化分析仪系统的设计,该设计采用ARM处理器为主CPU,运动控制器为从CPU,并采用实时的uclinux操作系统,使得系统很好地进行多任务处理,并保证了运动控制的实时性。     

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.     

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.     

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.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate