基于B/S模式的远程视频监控的实现

B/S技术是当今最流行的网络访问技术之一,使用JSP和JMF编程技术能够实现基于B/S模式的远程视频监控,能够通过PC和智能手机的浏览器进行远程视频监控,较经济的满足个人对远程视频监控的需求。     

基于嵌入式Linux的机房远程监测系统研究

为满足机房实时监测环境参数和视频信息的需要,本文综合运用嵌入式技术、WEB技术和信息检测技术,研究并设计一种基于B/S架构的嵌入式机房远程监测系统。通过传感器采集并远程传输机房温度和图像数据,在远程浏览器端动态实时显示,为及时掌握机房环境数据,实现机房科学管理提供良好的平台。     

基于DVR/DVS的分布式视频安全监控系统的设计与实现

通过对分布式系统架构技术的研究,建立了基于DVR/DVS(数字硬盘录像机/数字视频服务器)的C/S(客户端/服务器)和B/S(浏览器/服务器)模式下的视频安全监控系统模型。并运用VC++编程实现了基于H.264视频编解码技术的带电子地图导航的视频安全监控。     

基于B/S模式的视频远程监控系统

随着网络技术以及数字多媒体技术的迅速发展,基于B/S模式的视频图像远程监控系统逐渐成为新的研究和开发热点.本文介绍了B/S模式的特点与优势,并采用Java作为开发平台,结合JMF技术和IP组播技术,实现了基于B/S模式的视频远程监控.该系统突破了传统监控系统客户端不够灵活、移植性差以及网络利用率低等局限,具备了客户端操作方便,可实现多用户操作,图像传输及时,画面流畅等优点,可广泛应用于楼宇安防监控,工业远程监控,多媒体教学等领域.     

基于B/S的视频监控系统客户端的设计与实现

视频监控目前广泛应用于安全防范领域,B/S结构的视频监控系统将浏览器作为远程用户的操作界面,便于远程使用和维护。重点介绍了客户端软件框架结构的设计和功能模块的实现,并阐述了ActiveX控件在视频监控系统中的应用。     

S3C4510B在远程网络视频监控中的应用

本文介绍了一种基于网络的嵌入式远程视频监控系统。设计采用BT829B和IME6400对模拟视频进行采样与编码,然后在S3C4510B的控制下发送到网络上,用户可以通过浏览器观看监控现场的图像。     

基于ARM11的机器人远程视觉和控制的实现

为实现通过浏览器实时监控机器人的视觉,并进行操纵,设计了一种基于ARM11处理器和B／S架构的控制方案。机器人控制系统以S3C6410作为处理芯片,以USB摄像头实现机器人视觉采集,以无线WLAN方式接入互联网。详细阐述了嵌入式Linux系统上USB摄像头、WLAN网卡驱动的编译和移植,网页服务器Boa和视频服务器Mjpg－Streamer的移植。系统实现了远程监控条件下的机器人操控,开发方便,有很强的扩展性和可移植性,机器人视觉和控制效果良好。     

基于B/S结构的网络异常数据实时监测方法研究

针对传统技术中采用C/S结构存在的不足,提出了基于B/S结构(Brower/Server,浏览器/服务器)的监测方法,并构建出远程、实时、在线异常数据实时监测系统.该系统包括数据层、传输层、应用层、表示层和远程用户监控中心,通过Internet网络下载Web浏览器,在IE网站登录远程监控管理网站,实现远程操作界面的数据通讯,并通过网页上下载带有WinSocket的ActiveX控件,建立起数据通讯.还设计出基于S3C44B0处理器的远程监控终端硬件结构,采用网络数据过滤算法,降低数据包传递量,以提高网络运行数据的精度.实验表明,本方案在数据传输的实时性上优于C/S结构,大大减轻了网络数据传输负荷量.     

3G无线视频监控系统平台建设研究

3G无线视频监控系统是一个基于B/S结构的分布式平台。平台可依托注册服务器、管理服务器、WEB和WAP服务器和数据库服务器等相关服务器进行基本的网络远程监控,确保用户通过网页即可对相关的监控视频情况进行实时的在线观看。在平台中,整个数据库采用中心存储,针对遍布不同地方的摄像头的管理,可以通过分布式管理服务器部署来实现。     

基于Linux的B/S结构网络视频监控系统

介绍了一种基于网络的数字视频监控系统的设计与实现方案.该系统基于B/S网络结构,由视频编码器、视频服务器(S3C2410)和视频浏览器等主要模块构成.阐述了系统模型以及各个功能模块的实现方法.为多个远程分散的监控场所的集中式管理提供了一种可行的方法.     

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。     

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.     

Enhancing a leaf radiative transfer model to estimate concentrations and in vivo specific absorption coefficients of total carotenoids and chlorophylls a and b from single-needle reflectance and transmittance

The relative concentrations of different pigments within a leaf have significant physiological and spectral consequences. Photosynthesis, light use efficiency, mass and energy exchange, and stress response are dependent on relationships among an ensemble of pigments. This ensemble also determines the visible characteristics of a leaf, which can be measured remotely and used to quantify leaf biochemistry and structure. But current remote sensing approaches are limited in their ability to resolve individual pigments. This paper focuses on the incorporation of three pigments—chlorophyll a, chlorophyll b, and total carotenoids—into the LIBERTY leaf radiative transfer model to better understand relationships between leaf biochemical, biophysical, and spectral properties.Pinus ponderosa and Pinus jeffreyi needles were collected from three sites in the California Sierra Nevada. Hemispheric single-leaf visible reflectance and transmittance and concentrations of chlorophylls a and b and total carotenoids of fresh needles were measured. These data were input to the enhanced LIBERTY model to estimate optical and biochemical properties of pine needles. The enhanced model successfully estimated reflectance (RMSE = 0.0255, BIAS = 0.00477, RMS%E = 16.7%), had variable success estimating transmittance (RMSE = 0.0442, BIAS = 0.0294, RMS%E = 181%), and generated very good estimates of carotenoid concentrations (RMSE = 2.48 µg/cm², BIAS = 0.143 µg/cm², RMS%E = 20.4%), good estimates of chlorophyll a concentrations (RMSE = 10.7 µg/cm², BIAS = − 0.992 µg/cm², RMS%E = 21.1%), and fair estimates of chlorophyll b concentrations (RMSE = 7.49 µg/cm², BIAS = − 2.12 µg/cm², RMS%E = 43.7%). Overall root mean squared errors of reflectance, transmittance, and pigment concentration estimates were lower for the three-pigment model than for the single-pigment model. The algorithm to estimate three in vivo specific absorption coefficients is robust, although estimated values are distorted by inconsistencies in model biophysics. The capacity to invert the model from single-leaf reflectance and transmittance was added to the model so it could be coupled with vegetation canopy models to estimate canopy biochemistry from remotely sensed data.     

Mr. Twinn’s bombes

This article discusses the history and design of the special versions of the bombe key-finding machines used by Britain’s Government Code & Cypher School (GC&CS) during World War II to attack the Enigma traffic of the Abwehr (the German military intelligence service). These special bombes were based on the design of their more numerous counterparts used against the traffic of the German armed services, but differed from them in important ways that highlight the adaptability of the British bombe design, and the power and flexibility of the diagonal board. Also discussed are the changes in the Abwehr indicating system that drove the development of these machines, the ingenious ways in which they were used, and some related developments involving the bombes used by the U.S. Navy’s cryptanalytic unit (OP-20-G).