基于Web的水泥企业网络视频监控系统研究

基于C／S网络模式及Internet网络技术,描述水泥企业远程视频监控系统的基本硬件结构及视频信息和控制信息在系统中的传输过程,提出水泥企业网络远程监控系统中几个关键技术的实现方法,针对系统中的管理架构、总厂调度监控中心、各分厂视频监控系统及分厂视频传输与处理进行较为详细的阐述。     

基于嵌入式Internet的远程视频监控系统设计

文中提出了一种基于嵌入式Internet的远程视频监控系统设计方案,视频监控终端采用S3C2410微处理器,视频监控设备采集的视频图像经过MPEG-4压缩算法编码压缩后送人该处理器,利用RTP实时传输协议以及无连接数据报协议UDP/IP等将该数据流打包后,利用Internet网络进行实时传输到用户端.基于Internet的远程视频监控系统是信息网络与控制网络结合的产物,它借助网络完成监视与控制任务,将监控范围扩展到更广的空间,进一步推进了控制技术向网络化、分散化及开放化的发展.     

基于CAN总线的火灾远程监控系统

根据远程火灾信息数据采集和传输的特点,提出了一种基于CAN总线和嵌入式网关的火灾远程监控系统的总体框架设计方案.该方案使用CAN总线实现火灾远程监控系统数据采集终端的联网和通讯,并且通过嵌入式网关实现CAN总线到以太局域网或Internet的连接,最后,对接入Internet的火灾远程监控信息传输的实时性、可靠性和安全性进行了需求分析.     

远程视频监控系统的研究与设计

视频监控系统是数字化时代的最新发展趋势,而远程视频传输是其主要研究内容。文章以某制造业的工业现场为视频监控系统的研究背景,以C#为其开发环境,通过现场上位机将采集到的海康摄像机视频信息通过套接字发送到远程服务器上的数据库中,实现远程视频传输。远程客户端通过调用WCF中的函数来获得远程服务器数据库中的视频数据,实现视频实时显示。现场上位机再建立一个套接字,用来与远程客户端进行XML传输标志位,实现远程控制摄像机,达到了视频监控的功能。实施结果证明该技术可以方便灵活地实现多工业现场下位机—服务器—多客户机的视频监控系统搭建,并且可以保证数据传输的完整性和可靠性。     

基于嵌入式Web服务器的视频监控系统设计

对嵌入式Internet的远程监控系统进行了研究,构建了一个基于ARM处理器和Linux操作系统的嵌入式B/S模式的远程视频监控系统.系统以嵌入式Linux和嵌入式微控制器S3C2440为核心平台,通过嵌入式平台建立的Web服务器将USB摄像头采集来的视频信号经过网络传输,在用户端PC可以接收到视频图像,并根据需要来控...     

视频监控走向四化

随着计算机网络的发展和3G即将到来,IP视频的应用领域将越来越广泛,尤其是远程视频监控系统的应用,将越来越受到人们的青睐。远程视频监控系统是指通过采用目前世界上最流行的Mpeg4、H.264等数字视频压缩技术,将模拟视频信号、数据信号或语音进行编码、压缩并打成IP包,通过Internet传送,用户可以在安装有专用解压缩软件的计算机、PDA、手机上或电视墙、大屏幕上观看浏览、控制远程实时视频图像,并结合实时录像、报警联动、数据传输、语音对讲等功能。远程视频监控系统主要由前端监控设备、通信网络、监控中心、远程主机和管理中心组成…     

基于Android平台的智能停车场管理系统设计

目前大多数停车场的管理系统仍然停留在车位使用情况的管理上,缺乏对停车场整体情况的全面智能管理.文章所设计的智能停车场管理系统能使管理者在Android手机端,不但能方便、轻松管理停车场中的车位使用情况,还可以对停车场的照明、视频监控、消防等设备进行直观监控和管理.该系统主要通过Wi-Fi网络连接服务器,停车场内的智能照明设备和智能开关也通过Wi-Fi网络对停车场实时数据库进行更新,手机端通过Wi-Fi网络与停车场实时数据库信息进行交互通信来实现停车场的智能管理.从实验结果来看,管理者可以在装有该应用的Android手机上对停车场的车位以及照明、视频监控、消防等设备进行远程监控和管理,实现实时监控车位信息、预约车位、照明和视频设备远程监控和开关.对停车场实现了便捷、快速和智能化管理.     

基于IP网络远程监控系统的设计与实现

本文针对远程监控提出了一种结合IP网络的监控技术方案,系统总体架构采用S3C2410、USB摄像头与Linux操作系统组成嵌入式软硬件系统。并通过摄像头采集到的数据经过FFMPEG软件提供的H.264处理函数处理,数据转换后交给处理线程处理,采用双线程实现视频的数据的处理和传输。同时利用S3C2410网络模块,把图像数据转化为IP数据报通过RJ45接口在Internet上传输,实现远程监控。     

基于网络接口技术风光互补控制器系统的设计

设计了一种基于网络接口技术的风光互补控制器系统.通过网络接口协议转换器实现RS-232转换为Internet,进而实现Internet的接入;利用Microchip PIC16F887采集风光互补控制器系统数据;通过监控软件可以实现局域网和远程监控,对采集的相关数据和状态信息进行分析来掌握控制器的性能状态,通过远程参数设置来控制控制器的性能和故障排除.     

基于Zynq的移动视频监控系统

针对传统固定监控架设成本高、监控有死角且需要布置的视频采集端个数太多的情况,提出一种基于ARM和FPGA相结合架构的移动视频监控系统及其软硬件实现方法,在减少视频采集端节点的前提下,能够全方位实时捕捉用户所需的信息。该系统由电机控制模块、视频采集模块和无线网络控制模块构成,实现了无线视频监控系统;基于Linux操作系统、Web服务器和视频编码器,实现了用户可以通过Internet远程查看目标现场的状况。     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

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.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.     

Editorial: Special issue on recent advances in hybrid control theory and applications

正The demands of a rapidly advancing technology for faster and more accurate controllers have always had a strong influence on the progress of automatic control theory.In recent years control problems have been arising with increasing frequency in widely different areas,which cannot be addressed using conventional control techniques.The principal reason for this is the fact that a highly competitive economy is forcing systems to operate in regimes where     

Information for Authors

正Aim The Journals of Zhejiang University-SCIENCE(A/B/C)areedited by the international board of distinguished Chinese andforeign scientists,and are aimed to present the latest devel-opments and achievements in scientific research in China andoverseas to the world’s scientific circles,especially to stimulateand promote academic exchange between Chinese and for-eign scientists everywhere.     

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.