EPA控制网络中ZigBee接入点的软硬件设计

在EPA网络中，引入ZigBee技术是新提出的研究课题。本文在分析ZigBee技术的基础上，对ZigBee技术接入EPA控制网络进行系统建模和设计，给出ZigBee接入EPA控制网络的实施方案及协议模型，并按照提出的方案设计一种EPA—ZigBee接入点设备。最后，对设计的接入点设备进行多次测试。分析测试结果表明，EPA—ZigBee接入点设备运行稳定，工作可靠，可以满足工作现场的多种需要。     

对EPA控制网络接入ZigBee节点的设计

在EPA网络接入设备中,针对无线局域网、蓝牙等通信技术在工业测控中的传输、功耗、性能和安全性等方面所存在的缺点,在分析了EPA标准和ZigBee技术的基础上,给出了ZigBee节点接入EPA测控网络的实现方案。在AT91R40008的嵌入式系统控制下,对ZigBee到EPA控制网络的网关接入节点进行了软硬件设计,实现了符合标准规范的ZigBee终端EPA网络接入点,并构建了集成EPA和ZigBee的测控网络验证和试验系统。试验验证了该方案的可行性。     

ZigBee接入EPA控制网络的研究

在分析ZigBee技术的基础上，对ZigBee技术接入EPA控制网络进行系统建模和设计，给出ZigBee接入EPA控制网络的模型和方案；利用ZigBee通信模块实现ZigBee温度监控模块与ZigBee接入点间的通信，并给出通信实现过程。测试表明，ZigBee接入EPA网络具有可行性，且运行稳定，工作可靠。     

ZigBee接入EPA网络的安全策略

针对ZigBee技术的特点,结合EPA控制网络的安全规范与工业现场实际应用的需要,提出ZigBee接入EPA网络的安全策略与基于安全组态的实现方法。测试表明,通过安全组态增加了设备鉴别、访问控制等安全措施的ZigBee接入点设备和现场设备,有效提高了EPA中ZigBee网络的安全性能,且运行稳定、工作可靠,满足了工作现场的多种需要。     

基于GPRS/GSM的电梯远程监控系统设计

介绍了集计算机控制和远程无线通信技术于一体的电梯远程无线监控系统,通过电梯数据采集器和数据终端,将分布在各处的电梯运行状况和故障信息通过GPRS/GSM网络及时传输到监控中心,然后通过监控中心上位机软件的操作,实现对各处电梯进行远程监视和控制。     

接入云平台的吸收式制冷机组远程控制

本文针对新型吸收式制冷机组,设计了接入云平台的制冷机组远程监控系统.重点解决控制现场传感器分布分散、多网络协议异构与本地设备云平台接入的问题,实现了云平台与控制现场的数据共享及远程监控.控制现场采用现场总线技术,设计智能节点,搭建CAN传感器网络.通过嵌入式技术,设计了一款嵌入式云网关,网关采用数据缓存帧作为多协议转换的缓存器,采用无线模块建立与云平台的通路并使用EDP协议,实现控制现场信息对云平台的接入.在云平台设计了制冷机组云监控平台,通过设备信息的云注册与监控界面的设计,建立接入设备在云平台映射,完成机组运行参数在云平台的实时更新.本设计采用本地控制设备接入云平台的方法,实现了新型吸收式制冷机组本地实验数据远程共享和远程监控.     

基于GSM网络短消息的远程监控设计

利用GSM网络短消息实现对远程设备监控具有实时、方便、快捷等优点.文章给出了监控系统的硬件结构组成,并详细介绍了工作流程.利用GSM网络,结合单片机系统和串口,通过Delphi编写程序代码借助GSM网络发送AT命令,实现数据的无线传输和对设备的远程监控.     

自助洗车机远程监控系统的设计

为了应对自助洗车机运营成本逐渐提高的问题,设计了一套基于GPRS的自助洗车机远程监控系统.与洗车机设备相连接的监控终端采用了基于ARM+CPLD的硬件架构,通过GPRS模块可接入GSM移动网络,实现了洗车机状态的监控以及洗车机与监控服务器的无线数据通信.基于Delphi7和SQL Server 2005数据库开发的监控服务器软件实现了大量洗车机设备的远程监控.该系统在英国和西班牙等地取得了很好的应用效果.     

一种无线传感网与现场总线通信网关的设计与实现

设计了一种无线传感网与CAN总线、Modbus总线的通信网关。该装置以嵌入式微处理器STM32F207ZG为核心,采用无线通信模块CC2530作为无线传感网汇聚节点。在RS485通信的基础上实现了Modbus协议。STM32F207ZG内部CAN总线控制器配合CAN总线收发模块使网关可以接入CAN总线。试验表明:该网关分别接入Modbus总线、CAN总线均可实现总线监控网络与无线传感网的数据传输,且可以作为新型无线传感网监控系统扩充现场总线数据采集设备的接入点。     

基于移动短信技术的无线传感器网络系统

采用各种生化传感器进行现场环境质量多点或多参数监测时,需要实时将采集的数据传输到监控中心或决策人员。结合GSM(全球移动通信系统)技术和短距离无线通信技术,给出一种传感器数据无线远距离传输系统。该系统利用GSM网络短信平台,并结合使用短距离无线通信芯片nRF401,能稳定地进行多点远程监控和数据传输,系统运行费用低廉。该系统能广泛应用于环境监测、远程监控和移动医疗等领域。     

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.     

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~~     

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