基于嵌入式Linux的蓝牙以太网关设计

蓝牙技术作为一种新型短程无线通信技术,存在与其他通信协议的兼容性问题,介绍了蓝牙基本组网机制和数据分组格式,深入分析了蓝牙业务发现协议SDP和蓝牙局域网接入规范LAP,提出本地接入点LAP和蓝牙终端的一般业务发现过程.然后,基于嵌入式Linux操作系统搭建蓝牙网关嵌入式开发平台,提出可行的蓝牙网关系统结构,实现蓝牙匹克网与有线以太网之间的互联互通.     

嵌入式蓝牙网关中蓝牙驱动层研究与实现

目前,解决家庭和办公环境下智能终端互连互通困难的主要途径之一是蓝牙技术,针对蓝牙终端与互联网之间的不便互连互通的问题,研制了嵌入式蓝牙网关,并对其中关键技术展开了讨论.重点阐述了嵌入式蓝牙网关的硬件组成结构、软件体系架构和蓝牙驱动层框架.同时,提出一种管理蓝牙虚拟串口设备的方案.实验证明,基于上述技术所研制的嵌入式蓝牙网关是有效的,鲁棒的.     

基于嵌入式处理器MCF5272家庭蓝牙网关的实现

蓝牙是一种近距离无线通信技术,由于其低成本、低功耗和高可靠性的优点而被现代家庭网络所广泛接受。文中介绍了蓝牙技术和由各种信息家电所构成的家庭网络的基本概念,以及Motorola公司的嵌入式处理器MCF5272的一些基本性能特征,并阐述了基于MCF5272实现家庭蓝牙网关的具体方案。这种家庭蓝牙网关主要由蓝牙网关控制模块、射频收发模块、外网接口模块三部分构成,在文中还分别讨论了每一个模块的设计原理。     

基于蓝牙的家居网关数据采集处理系统的设计与实现

介绍了一种基于蓝牙技术的智能家居网关中数据采集处理系统的实现方案,该系统以ARM-Linux嵌入式系统为开发平台;首先讨论了USB蓝牙驱动在ARM9(S3C2410)上的实现和蓝牙协议栈BlueZ的移植;针对家庭环境数据流量较小的特点,采用蓝牙串口操作模式(SPP)建立无线虚拟串口,实现了家庭网关与家居设备之间的无线通信,应用多线程技术实现了家居网关对多个节点设备的实时监控;最后,详细介绍了一种数据包优先级处理算法,实现了对数据包的有效处理,提高了对家居设备监控的效率。     

车载蓝牙多媒体网关的设计与实现

以Freescale的32bit嵌入式处理器McF5251+CSR的蓝牙单芯片Bluecore5的双芯片结构,设计实现了一款集蓝牙免提通话、电话簿自动同步和流媒体音乐播放功能于一体的车载蓝牙多媒体网关.详细介绍了该网关的硬件设计及其应用软件开发中的关键技术.     

基于S3C44B0X的蓝牙家庭网关的设计

分析目前流行的基于蓝牙技术的智能家庭网络设计,介绍基于三星S3C44B0X芯片和嵌入式μcLinux操作系统为平台的智能家庭网关设计,给出具体的硬件设计和软件结构设计,实现了家庭蓝牙内部网络与PSTN、Internet互连,实现对家居设备控制的网络化及多样化.     

基于蓝牙技术家庭网络的研究和实现

对基于蓝牙技术的无线家庭网络进行了研究，简单介绍了如何通过蓝牙网关来实现对家庭蓝牙信息家电的远程监控，并阐述了家庭内的个人PC机和笔记本电脑等蓝牙终端如何通过蓝牙网关访问Internet。     

蓝牙技术在组建无线局域网中的应用

本文叙述了蓝牙技术的含义、特点及协议,对蓝牙网关的主要功能、蓝牙移动终端设备的微微网连接方法作了重点介绍,并详细说明了采用蓝牙技术组建无线局域网的方法,对蓝牙无线网络的三种安全模式作了简要叙述,最后,对蓝牙技术的发展趋势做了预测与展望。     

基于ARM9的嵌入式无线智能家居网关设计

针对传统智能家居系统中多种无线通信技术之间互联的困扰,设计了一个新的两种无线通信技术直连的智能家居网关。该网关以ARM920T嵌入式处理器S3C2440A为核心,ARM Linux为实时操作系统,采用新兴的Zigbee与Wi-Fi融合的通信技术,以满足家庭远程监控、家庭安防和家电控制的个性化需求。在ARM9处理器上构建嵌入式Web服务器,通过扩展Wi-Fi模块与Zigbee模块实现家庭内部无线网络的建立以及与Internet的连接,并给出了硬件组成结构和软件实现流程。实验结果表明,该网关在丢包率与时间响应方面优于有线网关和Wi-Fi—蓝牙网关,适合在智能家居系统中应用。     

蓝牙技术联盟开放网关架构

蓝牙技术联盟（Bluetooth Special Interest Group ,简称SIG）宣布开放蓝牙网关架构并推出入门工具套件,助力开发者快速为蓝牙产品创建互联网网关。有了蓝牙网关,具有蓝牙功能的传感器就能通过蓝牙技术连接网关设备,向云端传递数据并进行数据交换。全新架构让所有人都能对固定式的、具有蓝牙功能的传感器进行远程监测和控制,借此扩展物联网的潜在应用领域。     

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.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

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)

正~~