基于Web的HLA仿真系统研究

该文介绍了基于Web的仿真的优点，比较了本地执行、远地执行、本地和远地相结合三种基于Web的仿真实现方案和存在的问题。提出了基于Web的HLA(High Level Architecture)的仿真系统(WBHLA)，实现了浏览器层、Web服务器层、应用服务器层、HLA仿真层的四层体系结构。利用XML技术实现Web系统与HLA系统之间的数据接口，解决浏览器／服务器之间的大数据量交互和仿真想定数据在仿真盟员之间的分发两大问题。通过将与用户交互相关的运行管理盟员、想定管理盟员、数据采集盟员封装成COM组件，实现Web出系统与HLA系统之间的桥接。最后提出Web服务技术实现基于Web的仿真系统的研究方向。     

基于Qt/Embedded的Web浏览器的设计与实现

介绍基于Qt/Embedded设计的Web浏览器和嵌入式Linux GUI的发展概况,简单描述Qt/Embedded的平台搭建,重点介绍嵌入式Web浏览器的设计原则及基于Qt/Embedded的Web浏览器的开发过程。     

一种基于Ajax和UserData浏览器行为的Web系统数据存取交换模型

传统Web系统数据存取、处理集中于Web服务器,无法满足用户比较多、人机交互次数较频繁、存取数据量较大的Web系统的实时性要求。基于Ajax和UserData浏览器行为的Web系统数据存取交换模型使Web服务器、浏览器和浏览器端计算机三者之间都能进行数据交换,可以充分利用性能较高的浏览器端计算机的数据存取、处理能力,减小了Web服务器负载,提高了Web系统性能。     

基于ARM的嵌入式Web Server的构建技术

在基于ARM7的嵌入式硬件平台上，研究在μCLinux操作系统的支持下，采用CGI（通用网关接口）技术和Socket技术构建嵌入式Web Server的方法和技术，该技术为实现基于嵌入式Web Server的电器设备的远程测控提供了一条有效的途径，管理员可以通过浏览器远程登录嵌入式Web服务器将用户信息下传到现场设备，现场设备的数据也能通过Web服务器传送到浏览器。     

基于Web的无组件多文件上传方案的研究与实现

基于Web的多文件上传是网络应用中存在的一个普遍问题。该文介绍了目前常见的通过浏览器上传多文件的方案，并提出了一个利用Java技术和J2EE规范实现基于Web的无组件多文件上传的实现方案。     

基于AJAX的Web无刷新页面快速更新数据方法*

针对B/S应用中的Web服务器与浏览器间频繁操作导致Web应用执行速度慢的问题,提出了一种基于AJAX的Web无刷新页面更新数据的方法。     

Web浏览器动态调用Excel工作表的方法研究

基于浏览器／服务器技术和动态页面处理（ASP）技术的现代管理信息系统（MIS），需要对数据信息进行分析加工，形成各种各样的动态报表，这就要求Web浏览器能动态调用Excel工作表，针对这一问题，本文提出了几种不同的解决方案。     

Web报表打印技术研究

针对基于B／S结构的Web报表难以打印输出的问题，提供了一种简单实用的基于B／S结构的Web报表打印技术。该研究通过将微软的ASP技术和IE、内置的浏览器控件WebBrowser进行结合生成，注重简单、容易使用。通过研究得了一种较为完善的可以完全定制的Web报表技术，代码简练、实用，特别适用于具备微软ASP的技术人员使用。     

论如何构建一个轻量型嵌入式Web服务程序

基于Web浏览器的远程管理更受到设备维护人员的欢迎,在嵌入式设备上构建一个轻量级的Web服务程序,是很多嵌入式设备开发人员常常思考的问题。     

网络工具穿新衣

Web浏览器迅速成为运行网络监控软件的平台。此类产品的开发者们,包括Frontier软件开发公司、3DV技术公司和Bay网络公司,都开始提供从一个标准Web浏览器上跟踪网络运行、提供完整的访问网络运行情况的能力。其它的公司,包括DEC、Tinwald和Shomiti公司已投入到基于Web的网络监控软件开发中。监控软件开发商称,在18个月内,没有理由不相信会产生一个完全基于Web的产品。现在,90％访问厂商产品的人都从一个Web浏览器上读取报告。这个数字非     

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.