基于ZigBee的矿井无线网络应用研究

本文分析了矿山安全生产过程中,发展以Zigbee技术为代表的矿井无线网络的重要性,介绍了ZigBee技术的特点及应用于矿山无线网络的优势,详细介绍了ZigBee技术在矿山的应用实例和现状,并根据其目前应用探讨分析了其在深部开采和安全生产中巨大的应用前景。     

基于IEEE802．15．4的ZigBee无线网络数据传输安全的研究与探讨

ZigBee作为一种新型的近距离无线网络技术,在无线个域网领域获得了越来越广泛的应用。本文以ZigBee的网络协议栈结构为依托,着力介绍了ZigBee提供的数据传输安全服务、安全套件以及应用接口,对基于IEEE802．15.4的ZigBee无线网络数据传输安全问题进行了探讨,并对ZigBee无线网络安全机制的发展进行展望。     

基于无线传感器网络技术的工业监控系统

本文介绍了工业领域中无线传感器网络的优势,对无线网络技术ZigBee及英相关标准IEEE802.15.4进行了性能分析和研究,着重探讨了基于ZigBee的无线传感器网络构建和在工业自动化领域中的应用.     

ZigBee技术及其在矿山中的应用

ZigBee技术是一种新的短距离、低速率、低功耗的无线网络技术,具有广泛的应用。本文介绍了ZigBee技术的特点及其在矿山环境监测和人员定位中的应用,阐述了在矿山中应用ZigBee技术的关键问题,包括建立定位网络、建立移动目标的无线身份码和移动目标位置的确定。     

ZigBee无线传感器网络管理的应用研究

无线网络技术和计算机科学技术的飞速发展,各种尖端技术被人们所关注。ZigBee是一种新兴的、自组织、低功耗、低数据速率的近程无线网络通信技术,随着ZigBee技术的不断改进、成熟,更显现出在学校管理系统中的强大优势。详细分析了ZigBee无线传感器网络技术以及在校园管理中的应用。     

基于ZIGBEE技术的安防系统设计与实现

本文对无线网络枝术ZigBee及其相关标准IEEE802.15.4进行了性能分析和研究.介绍了ZigBee无线传感器网络的优势.结合ZigBee和GSM技术设计了一种无线安防系统,给出系统的设计方案.     

基于ZigBee的智能交通控制系统研究

ZigBee是一种低速的无线个域网技术(LrPAN),主要介绍了ZigBee无线网络技术,并对它在智能交通控制系统中应用的的可行性进行分析、研究。     

无线传感器网络在钢结构监测中的应用

基于ZigBee的无线传感器网是由一组由ZigBee芯片、传感器、微处理器构建的节点所组成的无线网络.本文论述了基于ZigBee技术的无线传感器网络在码头装卸设备的钢结构动态监测系统中的应用,阐述了其应用的必要性和优势,分析了系统的性能,给出了监测系统具体的构建和实现方案,并通过实验验证了方案的可行性.     

基于无线网络控制系统的无线网络协议比较和分析

随着无线通信技术的发展,Bluetooth、ZigBee等短距无线通信技术纷纷应用于无线网络控制系统中。介绍无线网络控制系统的基本结构,给出无线网络控制系统的结构模型,并对WLAN、Bluetooth和ZigBee三种主要无线网络协议作分析和比较。     

基于ZigBee技术无线教学系统的设计与实现

ZigBee是一种短距离、低功耗的新兴无线网络技术。为改善教学模式、降低教学成本,采用CC2430芯片构成无线网络节点,设计了一种基于ZigBee技术的无线网络教学系统,阐述了ZigBee技术在无线教学网络中的应用、通讯协议以及无线ZigBee节点的软硬件设计。系统中教师使用协调器,学生使用路由或终端节点,通过一台掌上学习机可以实现师生通信和在教师控制下的学生之间的通信。系统安装方便、智能高、可扩展性强,符合现代教学系统的发展趋势。     

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