基于物联网的水产养殖水质实时监测系统

为了实现水产养殖水质的实时监测和信息化管控,以ZigBee、GPRS、智能水质监测传感器等物联网核心技术为手段,设计了一套水产养殖水质实时监测系统,能实时采集水产养殖用水的水位、溶解氧、PH值、温度、视频等参数,并进行分析、展示和反馈控制,从而解决了水产养殖业水质实时监测和管理问题.     

基于ARM／GPRS／ZIGBEE水产养殖远程监控系统设计

为了满足水产养殖智能化的要求,设计了水产养殖中水质参数的远程实时监控系统,该系统由基于传感器节点,汇聚节点的水质参数无线监测网络和远程数据管理节点组成。采用以CC2430为核心的ZigBee模块传感器节点方案,构建基于ZigBee协议的无线传感网,实现水质数据采集;应用以ARM9微处理器S3 C2410开发的汇聚节点实现数据的汇聚和GPRS无线通信实现远程数据的传输。利用ZigBee技术和GPRS技术,此系统不仅满足了无线数据采集和数据传输的相关指标要求,而且有效地解决了水产养殖系统中布线困难、节点不可移动、不易维护等问题,满足了水产养殖中水质监测的需要。     

基于NIELVISIII的鱼塘水质监测系统

为实现对鱼塘水质的实时监测,帮助养殖户更好的采集水质参数,科学管理鱼塘水质,设计一套基于NI ELVIS III的鱼塘水质监测系统。本系统采用pH传感器、TDS传感器、浊度传感器等传感器进行鱼塘水质参数采集,采用NIELVISIII将采集数据进行处理,然后将处理后的数据通过TCP/IP协议上传到上位机,最后上位机通过创建WebApp将水质信息进行发布,实现鱼塘中pH、TDS、浊度等参数的远程实时测量显示,并且系统可对池塘附近人员进行拍照报备,防止人为破坏和恶意捕捞。本系统将数据化分析带入水产养殖业,养殖人员可随时随地查看鱼塘水质信息,提高养殖效率,具有较强的应用前景。     

卡尔曼滤波结合空间分布模型的ZigBee水质监测方法研究

为了解决常规水产养殖过程中人工成本高、数据采集误差偏大的问题,并实现及时了解关键参数空间分布情况,达到为水产养殖提供决策信息的目的,设计了基于无线传感器网络的水产养殖水质参数监测系统,该系统采用ZigBee无线通信技术构建传感器网络,主要监测水温、pH值、DO三种水质参数指标,并利用MATLAB平台,将卡尔曼滤波算法与线性内插值法相结合,实现水质参数的优化与空间分布四维模型的构建。通过选取分布空间中不同点的参数数据与实际测量的数据比较,温度、pH值和DO平均相对偏差分别为3.18%、2.89%、1.59%。研究结果表明通过卡尔曼滤波优化与线性内插值法构建空间分布模型,能准确掌握养殖池整体水质参数动态变化的信息,对养殖池的水环境管理有一定的参考价值。     

基于ZigBee的水产养殖智能监测系统设计

针对水产养殖的实际需求,利用ZigBee、GPRS和传感器技术设计一个无线传感器网络,构建了一套完整的水产养殖环境监测系统,对影响鱼类生长的温度、pH值、溶解氧含量和水位等环境因素进行实时数据监测和采集,实现了智慧水产养殖的目的.     

基于WSN的水产养殖环境监测系统设计

针对传统水产养殖过程中对水质监测的实时性差,测量精度低等问题,设计基于无线传感器网络的水产养殖环境监测系统。系统利用ZigBee无线通信技术组建传感器网络,采用混合网拓扑结构,通过对传感器节点硬件和软件的设计,完成水产养殖池中的溶解氧含量、PH值、温度等重要养殖指标的实时测量。水质数据汇聚到中心节点后传送给主控制器,并通过GPRS上传至云端保存。另外,针对云存储的安全问题,利用同态加密对上传到云端的数据进行加密,在不破坏云计算能力的前提下保护了用户的隐私数据。     

基于ZigBee的大水域水质环境监测系统设计

为了提高工厂化水产养殖的智能化水平,提出了基于Zig Bee协议的无线传感器网络（WSNs）的水质监测系统方案。设计了主要水质参数溶解氧、pH值、氨氮传感器的变送器电路,实现了对溶解氧、pH值、温度、氨氮含量等多参数的采集、处理,并通过无线网络传给终端节点,终端节点通过RS—232串口将数据传送给监测中心。测试表明：该系统实时性好,测量误差小,满足大水域水质监测需求。     

基于LoRa无线传输的水质监测系统

为解决目前我国水质监测存在的监测站点少, 通信费用高, 功耗大等问题, 本文构建了基于LoRa无线传输技术的水质监测系统. 该系统由数据采集终端、无线通信电路和远程控制中心3部分组成, 应用嵌入式技术和FreeRTOS系统完成传感器任务调度和数据采集, 通过无线通信电路使用LoRa技术发送至远程控制中心并在上位机软件中进行显示. 上位机软件使用Qt实现, 可实时监测到传感器状态以及监测点的定位信息. 测试结果表明, pH等5种数据的变异系数小于5%, 温度也仅为8.76%, 表明可稳定持续在一段时间内监测灞河水质. 本系统具有成本低, 可扩展性强, 集成度高等优点, 可用于污水监测和水产养殖等水域环境, 具有良好的应用前景.     

基于物联网的水产养殖水质监控系统设计

为方便监测和调节罗非鱼养殖水域的水质参数,设计了基于物联网（IoT）的水产养殖水质监控系统。前端传感器检测水体相关物理参数,通过采集单元的通信网络发送到智能水质监控单元,智能监控单元可以对增氧机、循环水泵及物料投放机等进行自动控制。同时,智能监控单元通过以太网或无线公用网络将数据传送到数据服务中心。用户可以通过移动终端或计算机实时了解水质信息,也可以通过监控软件下发命令,控制现场设备,实现对水质参数的手动调节。测试结果表明：该系统具有运行稳定、操作方便、成本经济等优点,可以应用于水产品的养殖生产活动。     

基于LoRa的低功耗水产养殖水质监测系统设计

针对水产养殖无线水质监测系统通信距离短、功耗高、网络复杂的问题,提出了一种新型的水产养殖水质监测系统。将STM8L低功耗微控制器作为核心,结合LoRa调制技术自定义网络通信协议,设计了低功耗远距离的无线传感器网络节点,完成了对水产养殖水质参数的采集与传输。重点介绍了软硬件的低功耗设计,进行了系统能量消耗和通信距离的测试。实验结果表明:水质监测系统在覆盖范围和功耗上优势明显。LoRa通信技术给未来组建大规模、低功耗无线传感器网络提供了可能性,在智慧农业上有很好的推广价值。     

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