基于无线网络CO检测报警系统设计与研究

该设计针对CO气体浓度监测的实时、低功耗要求,介绍了一种基于无线网络的CO检测报警系统;该系统利用CO气体传感器采集CO浓度数据,基于TI公司的16位微处理器MSP430F135和Silicon Labs的射频芯片Si4432,完成无线网络系统的中心节点和终端节点的设计;通过接收中心节点数据,实时监测到所有终端节点位置的CO浓度信息,对数据进行分析并及时报警,也可查询指定位置的CO浓度状况。     

基于无线网络CO检测报警系统设计与研究

该设计针对CO气体浓度监测的实时、低功耗要求,介绍了一种基于无线网络的CO检测报警系统;该系统利用CO气体传感器采集CO浓度数据,基于TI公司的16位微处理器MSP430F135和Silicon Labs的射频芯片Si4432,完成无线网络系统的中心节点和终端节点的设计;通过接收中心节点数据,实时监测到所有终端节点位置的CO浓度信息,对数据进行分析并及时报警,也可查询指定位置的CO浓度状况。     

基于物联网的环境噪声监测系统研究

为了实现噪声的实时监测、处理和噪声区域可视化,设计了基于物联网(IoT)的噪声监测系统。系统由监控终端、区域中心节点和管理中心组成。监控终端集成了微处理器模块、噪声传感器模块、GPS模块、无线通信模块等。噪声传感器模块和GPS模块用来获取噪声数据信息和噪声源的位置信息并通过无线传输网络将这些信息上传至区域中心节点。区域中心节点用来接收监控终端的数据并上传至服务器。监控管理中心负责噪声数据的发布和绘制噪声地图。实验测试表明:系统可实时准确测量和传输数据,可以为噪声治理提供依据。     

基于订阅发布的空气质量监测系统的设计实现

近几年空气污染愈发严重,空气质量问题不容小觑。本文设计并实现了基于订阅发布的空气质量监测系统,包括便携式、低功耗的传感器模块,发布订阅服务端系统和跨平台移动客户端。其中,底层传感器节点是以Arduino扩展板进行编程集成的,能够通过若干个感知设备对空气中CO、PM2.5、PM10、03、VOC、NO2、温湿度等进行监测。同时传感器节点和移动端能通过无线、有线、蓝牙等方式与发布订阅服务器系统进行通信,接收服务端推送的订阅或发布信息,移动端接收感知信息后,可实时动态展示空气质量信息和城市天气信息,以便用户随时监测空气质量。     

基于NB-IoT的区域空气质量监测系统设计与实现

针对现有可变区域范围内空气质量监测机动性差、信息化程度低及管理不便等问题,设计并实现了一种基于NB-IoT的区域空气质量监测系统,系统由多个监测节点、远程监管平台及Android移动终端组成。监测节点采用STM32为微控制器,采集所在位置的空气质量相关参数,并通过NB-IoT通信模块发送至远程监管平台,实现对大区域空气质量的监控与管理,通过下发指定小区域的权限至Android移动终端,可以查看权限范围内的空气质量状况。系统测试表明:测量精度高,数据传输稳定可靠,满足多场景环境下灵活应用的需求。     

新型现代有轨电车内PM2.5浓度实时监测系统设计

设计了一种新型的基于GPRS的现代有轨电车内PM 2.5浓度实时监测系统.系统包括车载硬件终端和中心平台,车载硬件终端实现对电车内PM 2.5浓度数据采集;中心平台以TCP协议的Socket通信为基础,采用Visual Basic软件设计,能实时显示和记录车内PM 2.5浓度的动态曲线以及历史数据.车载硬件终端与中心平台间采用GPRS网络模块SIM900A通信.该系统通过与车内空气净化器组合使用,可提高车内空气质量.     

基于CC2530的重症监护病房环境实时监测系统设计

为了实时监测ICU(intensive care unit)病房环境中湿度、温度及CO2浓度等环境信息,设计了基于CC2530的重症监护病房环境实时监测系统,系统由重症监护病房环境感知节点、网关节点、监控终端等几个部分构成;以CC2530为主处理器完成对感知节点的软、硬件设计,根据重症监护病房湿度、温度及CO2浓度等环境信号的特点,设计各传感器模块的驱动电路;在Z-STACK协议栈的基础上,设计感知节点软件,实现数据的转发;经测试,网关节点的收包率在80%以上,预警信号产生时间小于3s,监控终端数据刷新能力强,该系统具有精确度高、实时性强、预警及时等特点。     

基于体域网的远程健康监护系统设计

为满足对老年人和慢性病患者生命特征信息远程实时监测的需求,设计了基于体域网的远程健康监护系统,系统由WBAN、数据处理服务中心、各监控终端等几个部分组成。设计了基于ZigBee网络的生命特征信息感知节点,根据生命特征传感器采集的信号特点设计驱动电路,以CC2530为主处理器进行节点软件设计,完成了对人体心电、血压、温度等信息的实时采集和转发。数据处理中心负责信息存储、分析和发布,各种监控终端也可以通过数据处理中心查询被监测者的生命特征信息。测试结果表明,系统能够完成相应的功能,满足应用需求。     

基于粒子滤波的物联网通信终端信息智能监测系统设计

传统通信终端信息智能监测系统在信息监测过程中,未考虑节点信息遗漏问题,导致监测精准率低。提出基于粒子滤波的物联网通信终端信息智能监测系统设计。依据物联网环境特征,将系统整体架构划分为终端感知单元、监控开关单元和客户端单元,对各单元组成硬件进行改进;采用粒子滤波算法,对协调器中节点信息进行PAN标识。智能扫描节点信息是否有遗漏,在扫描限制范围内对遗漏信标进行统计,获取信标相应协调器信息,并发出连接请求,对节点地址进行重新分配,在新地址上添加连接成功状态指令,优化开发软件监测功能,完成系统设计。实验结果表明,该系统对节点中的遗漏信息进行充分处理,实时显示波长稳定,显示结果清晰度好,有效提高了监测精准度。     

基于GPS和GPRS车载导航定位系统的实现

车载终端通过GPS外接天线接收GPS信号，由串口将此信息传送给主机，主机解算出车载当前的经度、纬度、建度、时间、状态等信息，一方面为电子地图提供地理位置信息，将车载的位置在终端实时显示出来：另一方面将信息打包通过GPRS发送给监控中心，提供监控所需的原始数据。文中介绍了车载终端的组成，重点阐述了车载的定位及显示技术。     

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