一种基于ARM的视频监控系统的硬件设计

嵌入式Web技术对降低监控系统成本,提高系统可靠性有着卓越贡献,因此基于ARM的视频监控系统将成为新的研究热点。本文提出一种基于嵌入式Web技术的视频监控系统硬件设计方案,使用户不受时空限制,通过Internet利用Web浏览器实现对远程摄像头设备的在线访问、监控等操作。其中嵌入式网络视频服务器采用AT91SAM7X256作为主控芯片,视频图像信号的采集通过OV7640构成的串口摄像头获取,网络传输由RTL8021BL网卡模块实现。实际运行效果表明该硬件系统具有良好实时性和稳定性,具有实际应用与推广价值。     

基于ARM11-Linux的视频采集传输系统的研究

研究了一种基于ARM 11的视频采集无线传输系统,实现了主体家庭网关通过摄像头对各个分散房间的有效监控.系统选用ARM 11内核的S3C6410作为系统处理器,CMOS摄像头OV9650作为采集端,在自主设计的硬件平台上搭建Linux软件系统,利用系统内部的V4L2提供的数据结构、应用函数等完成摄像头的采集;在传输系统方面,采用传输速度较快的WIFI-Ad-Hoc模式(端对端传输),依靠TCP/IP协议的传输方式使采集端与家庭网关之间建立连接,成功实现家庭网关对各个分散采集点视频信息的接收.     

基于STM32的车牌识别模块在烟花溯源系统中的应用

烟花溯源需要对运送烟花的车辆进行监管以便后续追踪定位,所以论文设计了基于STM32的车牌识别模块,结合无线射频模块,利用先进的电子通讯技术对烟花出入库进行严格监管,以STM32F103处理器为控制中心,通过OV7670摄像头采集烟花出库过程中车辆的图像信息,通过RFID模块触发摄像头拍照,并将采集到的图像进行车牌识别,定位出车牌号码,并以文本形式无线上传至上位机,同时将图片信息存入SD卡.该系统硬件体积小,成本低,灵活性好,安装方便,适合出入车辆较少、背景较简单的厂区、仓库的车辆自动监管.     

基于ARM9的视频传输系统的设计与实现

该文介绍了一种基于arm-linux的视频传输系统。该系统通过USB摄像头采集视频数据,采用Video4Linux模块提供的编译接口进行视频采集程序的设计,经MPEG-4压缩算法对视频流进行压缩编码,使用实时传输协议和实时传输控制协议,实现流媒体数据的网络传输。整个系统建立在嵌入式构架上,能独立完成实时视频的采集、处理及传输功能。     

基于S3C2440嵌入式平台的USB摄像头视频监控

针对传统视频监控系统造价昂贵,安装不便的缺点,提出了一种基于嵌入式的远程视频实时监控系统设计方案。系统以S3C2440为硬件平台、开源的Linux为软件平台,采用通用的USB摄像头,通过内核提供的Video4Linux接口对视频信息进行采集处理,由符合TCP网络传输的mjpg-streamer流媒体服务将视频传送到网络。实验结果表明,经过采集处理后的视频效果和实时性都达到了监控的要求。     

基于RTSP的嵌入式视频监控系统设计

设计一种RTSP嵌入式视频监控系统。该系统基于服务器/客户端的模式,用户使用PC机通过以太网实时监控观测对象。系统基于DM3730ARM-Linux平台,通过V4L2接口从摄像头采集视频,通过第三方库libswscale将采集的视频数据转换为YUV420P格式,利用x264对视频数据进行编码;再将上述采集编码系统与Live555开源工程结合,在Live555中构建新的source类,该source类直接从摄像头取数据、编码并输出H264视频流,将此视频流通过RTSP协议传输到客户端,实现整个视频服务器的构建。测试结果表明客户端播放器能够流畅地播放视频数据,系统稳定可靠。     

基于RFID技术的铁路车轮堆垛机定位控制系统

为提高铁路车轮堆垛机的工作效率，提出基于RFID技术的铁路车轮堆垛机定位控制系统。利用RFID读写器采集电机信息，经变频器处理后，通过ET200s传输至定位模块，利用RFID无线定位测量方式进行定位，并利用其实现堆垛机的精准调速，控制堆垛机出库。实验表明，该系统精准定位不同运行方式下的堆垛机位置；堆垛机启停控制响应速度快，不受信噪比影响；系统信息录入效率高，可极大程度提高堆垛机工作效率。     

基于嵌入式Web服务器家居视频监控的研究

针对智能家居的远程监控问题提出了一种基于ARM,Linux和计算机网络的视频监控系统。该系统以ARM9芯片S3C2440为硬件平台,以Linux操作系统为软件平台。首先将USB摄像头采集的视频信息进行处理,然后通过Web服务器网络进行传输,最后用户通过浏览器即可对远程视频进行实时的监控。     

基于RFID和无人机的畜牧定位系统

针对牲畜放养情况下出现的易走丢,难以定位和统计问题,设计实现了基于RFID和无人机的畜牧定位系统;系统主要由数据采集、数据处理和终端显示3个功能模块组成;通过给每个牲畜绑定一个有源RFID标签,结合装配有RFID阅读器和手机的无人机进行自动巡航,实现把RFID数据和扫描到RFID时所对应的经纬度数据经手机进行预处理,再使用移动数据网络发送到数据服务器;服务器端对数据进行进一步分析和处理后,将牲畜位置数据和统计数据在养殖户手机终端显示,方便养殖户进行牲畜查看和管理;最后通过实地实验,对获取到的数据进行结果分析,显示牲畜定位误差在系统估计误差范围之内,具有较高准确性;对比原有的修筑围栏等方式,本系统具有成本较低、使用方便、可行性高的优点。     

实时视频传输系统

针对智能安防、智慧家庭等实时传输视频的需求,实现了一种基于H．264的嵌入式实时视频传输系统．系统利用摄像头TB．2054BD采集视频信息,然后经过DM365视频协处理器进行压缩,压缩后的码流采用RTP包的形式发送到PC客户端进行解码显示．经验证该系统能够很好的完成实时视频传输的需求．     

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