基于三层结构的数据通道思想及其应用

通过分析、研究C/S、B/S和三层(多层)结构的特点,提出了一种基于三层结构的数据通道思想,并将数据通道技术应用到高校科研管理系统中。利用数据通道技术,Web用户不直接访问数据库,而是通过Web服务器来访问应用程序,通过应用程序的执行来访问数据库,从而提高了数据库的安全性。由于在Web服务器与数据库服务器之间不存在平台,只进行通信,因此实现起来简单、快捷。     

基于Caché的三层结构Web开发模式的研究

相对于关系型数据库,Cach6是一种全新的面向对象后关系型数据库,能够快速开发Web应用。进行了基于CSP(Cache服务器页面)的Web开发模式的分析研究;提出了在Cach6中构建三层结构,三层结构包括数据访问层、业务逻辑层、页面表示层,并对三层加以实现;最后从实际出发将研究成果应用于HIS(医院信息系统)。实际应用表明,采用基于Cache的三层结构Web开发模式的HIS具有速度快、稳定性强、维护方便且成本低的优点。     

基于三层结构的数据通道思想及其应用

通过分析、研究C／S、B／S和三层（多层）结构的特点，提出了一种基于三层结构的数据通道思想，并将数据通道技术应用到高校科研管理系统中。利用数据通道技术，Web用户不直接访问数据库，而是通过Web服务器来访问应用程序，通过应用程序的执行来访问数据库，从而提高了数据库的安全性。由于在Web服务器与数据库服务器之间不存在平台，只进行通信，因此实现起来简单、快捷。     

基于多层结构的可视化系统的设计与实现

设计实现了一种基于多层结构的可视化系统.系统采用三层结构,由Web客户端、Web服务器/应用服务器、绘制服务器构成.系统以应用服务器为核心,由应用服务器负责系统的通信控制.实验结果表明,此系统结构更合理、更利于后期维护和扩展,能最大限度的降低对客户端的软硬件要求.     

三层B/S结构网上查询系统的实现

本文介绍了三层浏览器服务结构的设计思想，以及在Delphi中三层浏览器服务器结构应用程序的总体框架。比较了ISAPI/NSAPI扩展DLL与CGI类型和ASP脚本语言类型的Web应用程序在执行效率上的优缺点之后，利用Delphi开发基于ISAP/NSAPI扩展DLL的三层浏览器服务器数据库网上查询系统。     

Edwards描绘“三层”未来

借Comdex China’98在北京召开之际,美国BEA系统有限公司产品计划与战略副总裁Jeri Edwards女士来到北京发表演说,她认为,随着开放式系统及Web的迅速普及,三层客户机/服务器技术将逐渐成为应用系统的主流结构。三层客户机/服务器结构的设想,早在1984年就由许多公司提出过,但只是在近5至6年内才被逐渐认识和应用。在以网络为中心的时代,两层客户机/服务器的发展显然已走到了尽头,只有向客户机/服务器的深层发展,才能满足网络用户的需求,这是大势所趋。Edwards还认为,三层客户机/服务器结构有很多模     

基于Web的远程财务管理系统

本文采用最新的网络编程技术活动服务器页面(ASP)并结合SQL Server7.0数据库,开发了基于Web的三层客户机/服务器结构的远程财务管理系统。     

基于EAServer的分布式多层模型研究

在管理信息系统开发过程中为了扩展Web功能及解决客户/服务器结构存在的不安全、不易维护、胖客户端等问题,提出了分布式多层结构。该方法采用了Sybase的应用服务器EAServer(EnterpriseApplicationServer),为基于组件的分布式应用提供了中间层的框架结构,在探讨和研究分布式的基础上,用一个实例叙述了利用Power鄄Builder和EAServer实现基于组件的三层Web应用体系的过程。实践证明,该方法可行、有效。     

云数字图书馆何时才能走进百姓生活

<正>目前,数字图书馆多为传统的B/S三层结构,即用户通过图书馆终端或者浏览器访问图书馆网站(接口层)进行查询、借还书等操作。接口层的Web服务器把用户请求发送到中间应用层服务器应用层服务器再对数据库进行操作,实现用户需求。然而,这样的架构难以满足图书馆大量采用Web2.0服务的需要,这主要体现在三个方面:一是数字图书馆的图片检索技     

基于Web Services的GIS多层体系结构研究

通过分析通用的Web Services架构和OWS技术体系结构，提出了一个基于Web Services的多层GIS组件体系结构，介绍了该结构的特点及各服务组件的功能。最后给出了该体系结构的一个实现技术方案，并详细分析和讨论了其中Web应用服务器、应用服务器及数据服务器三部分在设计与实现中关键技术的处理策略。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

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。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

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.