城市微环境空气质量监测系统设计

文中介绍了一种城市空气质量监测系统。该系统基于第四代移动通信技术搭建大面积、高密度的无线传感器监测节点网络。传感器节点以STM32为控制核心,利用PM_2.5、PM₁₀、SO₂、NO₂、O₃和CO等传感器实现微环境中空气质量数据采集,利用GPS定位装置实现空间位置数据获取。节点通过无线通信模块将空气质量和地址数据实时上传至服务器,服务器对数据进行处理并在终端界面显示空气质量云图,实现空气污染监测和溯源。     

基于Wi-Fi的空气质量监测无线传感器系统设计

为实现空气质量在线实时监测目的,设计了一种基于Wi-Fi的空气质量监测无线传感器系统。采用STM32F103微处理器,串口接入电化学气体传感器采集数据,TFT式显示屏显示各气体数据,自定义了可拓展的数据通信协议,可通过Web下发Wi-Fi账户和密码,满足多种空气质量监测场景需求。实验测试结果表明:数据在线传输稳定,网络异常条件下,在通信恢复后实现稳定的数据补传。     

基于ARM+OneNET云平台的工厂车间环境监控系统设计

为保证工厂车间员工工作环境的舒适和安全,设计了基于 ARM+OneNET 云平台的工厂车间环境监控系统,对车间内空气质量、光照强度、温湿度进行监测,并通过设定阈值的方式控制设备进行报警和车间环境改善。系统选用 STM32F103VET6 单片机作为主控芯片,结合温湿度传感器、光照强度传感器、空气质量传感器监测到的数据,...     

城市道路空气质量实时监测系统的设计

传统的空气质量检测仪只能实时显示数据,并不具备数据传输能力;仪器采集的数据取决于传感器的质量高低,而进口的红外线空气质量分析仪价格非常昂贵;为解决这些问题,利用Arduino Uno R3单片机作为控制核心,与多种气体传感器一起组成实时监测终端;传感器采集的数据经过Arduino单片机处理后,通过VANET技术发送给车载单元或手持观测器进行实时显示;同时数据也可以通过Internet传送到控制中心;重点描述了监测终端的硬件结构与软件设计,测试结果表明本系统具有可靠性高、实时性好等优点,具有非常高的实用价值。     

基于物联网的实时空气质量智能闹钟系统

为了使户外运动人群科学运动,免受空气污染的影响,设计一种基于物联网的实时空气质量智能闹钟系统。系统通过设置在户外运动场所的空气质量传感器测量实时空气质量,在单片机上对实时空气质量数据进行处理,通过网络模块把实时空气质量指数传输到物联网平台,运行在智能终端上的闹钟APP从物联网平台获取实时空气质量指数,对空气质量指数进行判断,根据设置对人们进行智能提醒,达到根据实时空气质量指数指导科学运动的效果。     

工业废气排放质量监测系统设计

空气污染已成为制约我国城市经济和社会进步的巨大障碍。空气质量监测是环境监测的一个重要组成部分,做好空气质量监测是降低空气污染对人们身体健康造成的伤害和改善环境质量的一个重要手段。提出了工业废气排放质量监测系统的设计,采用STC15F2K60S2单片机作为微控制器,利用空气微尘颗粒检测类传感器,对空气质量相关数据进行采集处理;同时,将空气质量数据通过无线通信模块nRF24L01发送给主站,由主站对接收到的空气质量数据实时地进行显示、存储,达到了利用主站对多个监测点的空气质量进行实时监测的目的。工厂工业废气排放质量监测系统的软硬件设计,摆脱了传统空气检测系统的局限性,对改善空气质量有着重要的意义。     

基于STC单片机的气象监测系统的设计与应用

为了较精准地检测多种气象要素,设计了基于STC单片机的气象监测系统。该系统采用光伏离网户用系统进行供电,以STC15W单片机为核心,利用空气质量传感器模组、风速风向传感器以及温湿度传感器对相关气象信息进行在线实时监测;通过串口通信、模数转换、单总线通信读取相应传感器数据;以原厂提供的数据转换公式及滤波算法,换算出各个传感器监测的气象数据,并进行显示。测试结果表明,该系统能够有效监测多个气象要素信息,且稳定性良好,实时性高,监测精度高。     

基于四旋翼飞行器的空气质量参数检测仪的设计

在对当前空气质量检测设备研究的基础上,提出了一种基于四旋翼飞行器的空气质量参数检测仪设计方案,可解决目前的空气质量参数检测仪在一些特殊场合使用受限的问题。首先详细论述系统设计方案,然后通过实验进行验证。方案以STM32F103RBT6为主控芯片,利用温湿度检测传感器、VOC检测传感器、激光粉尘检测传感器、气压传感器以及无线传输模块对待测点的空气质量进行检测和数据传输。通过实验,证明了方案的可行性,且该方案在大气污染治理中具有一定应用价值。     

基于ZigBee无线传感网络空气质量监测系统的实现

随着社会不断地发展进步,环保作为当今研究的热点问题,而空气质量监测已经成为公众关注的焦点,对空气中的污染物进行定点、连续或定时的采样和测量,并将监测结果发送到监控中心,加以分析并得到相关的数据进行分析。基于ZigBee无线传感网络空气质量监测是一种典型的无线传感器网络应用。采取实时监控,以便快速分析空气质量及成分,能迅速定位污染源,以便采取有力措施进行污染干预。     

基于云平台的空气质量监测系统

空气质量一直是人们所关注的问题.为了能够更好的防范劣质空气对人们的伤害,本文设计了一种便携式空气质量监测系统:利用温湿度传感器、PM2.5粉尘传感器、一氧化碳传感器、污染气体传感器实时获取当前环境空气的状态,再通过无线模块上传到远程云服务器;用户只需通过手机客户端或浏览器就能查看空气质量的好坏及变化的历史曲线,并有针对性的进行防护,保证个人身体健康.     

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