基于达芬奇平台的视频监控系统的设计

本文中设计并实现了一个基于TI最新的DSP多媒体平台——Da Vinci平台的微波传输无线监控系统。介绍了新一代双核DSP平台的特性，阐述了基于双核系统的开发方法和流程。     

三级多媒体监控系统的设计与实现

介绍了一个通过三级网络结构互连的多媒体实时监控系统的设计与实现，并叙述Linux平台的监控终端的多线程设计思路，该系统利用纯软件进行H．263的视频编解码，通过LAN传递较高清晰度的监控图像，并借助一台本地监控主机的转发，实现远程监控机的PSTN／ISDN拔入，进行静态图像，实时视频监控，语音的传输和远程控制，实现多级多点视听多媒体监控和通信。     

基于PXIe的磁悬浮飞轮数字控制平台设计

分析了磁悬浮飞轮的控制策略的基本需求,基于PXIe技术,构建了磁悬浮飞轮的监控平台。介绍了监控平台的软硬件组成,在此基础上分析飞轮转子的数控平台的搭建过程。设计了数据采集程序,验证了监控系统的实时性,对数字控制平台的功能进行了简单的介绍。     

基于Kingview的空调远程监控系统的设计与实现

智能控制器与网络技术的发展给监控系统的设计与实现带来了便利,同时也提出了更高的要求.着重介绍了如何在Kingview开发平台下设计和实现空调远程监控系统.实践表明,利用Kingview开发平台可以简单、灵活地构建稳定、经济的远程监控系统.     

基于PXle的磁悬浮飞轮数字控制平台设计

分析了磁悬浮飞轮的控制策略的基本需求,基于PXle技术,构建了磁悬浮飞轮的监控平台.介绍了监控平台的软硬件组成,在此基础上分析飞轮转子的数控平台的搭建过程.设计了数据采集程序,验证了监控系统的实时性,对数字控制平台的功能进行了简单的介绍.     

基于日志分析平台的监控系统的设计与实现

介绍基于日志分析平台的监控系统的设计与实现。针对复杂软件系统的监控点类型多样、监控点数量多、监控点易变化、监控数据量大等问题,提出一种基于日志分析平台ELK的监控系统的设计与实现方法。通过对日志分析平台ELK进行改造,把日志处理中的收集、存储、索引、搜索、分析方法引入到监控系统的设计与实现中,解决了传统监控方法存在的问题,为监控系统的设计提出了新的思路。     

Win32平台堆栈溢出保护软件的设计

文章介绍了基于堆栈溢出漏洞进行攻击的原理，提出设计Win32平台堆栈溢出保护软件，利用堆栈搬移和API监控的方法来防范溢出攻击。     

多媒体网络实时监控平台中网络通信机制的研究与实现

以作者自行开发的多媒体网络实时监控平台为例，介绍了利用Winsock进行网络编程和多线程编程的基本方法，并详细论述了多媒体网络实时监控平台中，如何将两种技术有机结合进行的网络通信机制设计及其技术实现。     

THMR-V平台上基于Linux的监控系统设计与实现

THMR-V室外移动机器人及视觉临场感遥控系统是清华大学智能技术与系统国家重点实验室研制的实验平台。介绍了THMR—V原监控系统存在的不足以及在Linux系统下新监控系统的设计与实现，并介绍了仿真算法的改进，同时对根据实验情况作了分析和总结。     

机器人生产线的网络信息管理及监控系统

本文介绍一个以机器人生产线为背景的网络信息管理及监控系统的设计与实现．该系统由网络实时通信，监控技术及信息管理，计算机与机器人系统的信息交互平台３部分组成．信息交互平台保证计算机与不同的机器人之间实现灵活的、实时的数据传输．网络通信层以客户／服务器模式来设计，并考虑网络通信的实时性，以满足客户对不同信息源的需求．监控技术及信息管理则在上述平台上，以网络为中心，实现对现场生产线的监控及信息管理．整个系统的设计，将监控过程与信息管理融为一体，体现出系统集成的思想     

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).