利用ASP.NET构建Blog

Blog的迅速发展为人们提供更快捷方便的学习交流环境。为了实现教师和教师之间,教师和学生之间的教学和交流,构建了一个基于ASP.NET的Blog平台,用ASP.NET访问Access数据库,实现了注册、登陆、发表文章、评论、回复、管理日志等功能。     

基于ASP.NET的Web GIS数据库访问的实现

ASP．NET是微软推出的新一代动态网页技术，在ASP．NET中，对数据库的访问是通过ADO．NET来实现的，ADO．NET对象模型中的DataSet对象提供了一系列访问数据库的接口，因此利用ASP.NET提供的ADO．NET可方便地实现对GIS属性数据的访问；同时可利用ASP．NET提供的自定义控件的功能，通过定义一系列具有空间数据操作功能的地图控件、远程处理（．NET Remoting）技术与创建的地图服务（Map Service），实现对GIS空间数据的访问和显示。     

ASP.NET协同SQL SERVER技术在专题学习网站应用研究

基于ASP.NET＋SQL SERVER技术的Web应用或动态网站开发技术。使得Web应用的开发更加简单快捷。本文论述了一个基于ASP．NET、ADO，NET和SQL SER．VER2000技术有机结合的专题学习网站设计原理、总体架构及其功能实现，该网站为使用者交流提供一个全新的互动平台，交互功能强，有较好的应用前景。     

ASP.NET技术在电子商务系统中的应用研究

分析了ASP技术在电子商务系统开发中存在的问题，讨论TASP．NET技术的体系结构，并提出了基于ASP．NET技术的电子商务的实现框架，最后深入探讨了如何利用ASP．NET技术实现数据库访问，以及从验证、授权和扮演3个层次提高系统安全性能的技术和方法。     

基于ASP．NET的网上论坛系统的设计与实现

随着Intemet技术的发展，论坛已成为网络上不可缺少的交流方式之一。在介绍了系统的设计目标、功能和数据库设计方案之后．结合ASP．NET的开发环境阐述了系统的实现方法。利用ASP．NET技术开发的网上论坛系统，实现了网上论坛的动态管理，使得对信息的管理更加及时、高效，方便用户及时上网浏览有用信息，发表自己对相关问题的看法。     

基于ASP．NET技术的网上论坛的设计

介绍了．NET框架的体系结构、．NET程序的执行架构以及ASP．NET的优势，论述了基于ASP．NET的网上论坛的设计方法以及实现该论坛的关键技术。     

基于ASP.NET实现WebGIS数据操作的探讨

ASP．NET是微软公司新推出的动态网页开发语言，它是在服务器端执行用户请求并将结果发送到用户的。通过分析ASP．NET与其他的动态网页开发技术，特别是与ASP的比较，体现了ASP．NET的特点。对如何使用ASP．NET与VB．NET结合，实现WebGIS对数据库操作特别是对属性数据库操作做了较详细的介绍，是对WebGIS的有益探讨。     

基于ASP．NET技术的模糊查询网页设计和实现

本文以硕士论文数据库为例，介绍利用ASP．NET技术和Access 2000实现模糊查询网页的程序设计方法，并给出了ASP．NET与Access数据库连接的实现过程。     

ASP．NET—动态网页开发趋势

以比较ASP．NET与旧版ASP的差别为出发点，详细分析了ASP．NET程序的执行过程和程序接口，简要介绍了ASP．NET的新功能。最后给出文件上传和E-mail发送的ASP．NET程序实例。     

基于ADO.NET技术的Web访问数据库研究与实现

首先介绍了ADO．NET、ASP．NET和三层体系结构,在此基础上讨论了四种在web应用程序中基于ADO．NET的数据库访问及其实现技术,最后用ASP．NET／C#语言实现了编程。     

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).