超文档的数据库模型

用数据库技术实现超文档的管理是数据库领域一个新的研究方向,文章介绍了这一研究方向的新进展.Alberto和George使用关系型数据库管理超文档中的链接,对查询语言SQL进行扩展,提出查询语言WebSQL.Serge Abiteboul使用面向对象数据库表示超文档,对查询语言OQL进行扩展,提出OQL－doc.前者没有提出如何用数据模型表示超文档,后者则没考虑超文档中的链接,为此该文提出进一步的解决方法,将链接用对象表示,引入链接距离、文档树、文档的n层链接树概念,并以例子说明这些方法的使用.     

面向对象数据库的C宿主语言接口实现技术

面向对象的数据库管理系统（ＯＯＤＢＭＳ）通常都具备自身的查询语言，它以交互的方式供用户进行数据定义与数据操纵．除此之外，它还必须为程序员提供可在Ｃ、ＦＯＲＴＲＡＮ、ＰＡＳＣＡＬ等高级语言里嵌入使用查询语言的宿主语言接口．本文首先介绍这样一种Ｃ宿主语言接口Ｃ—ＯＳＤＬ，而后重点讨论它的实现技术，尤其是将Ｃ—ＯＳＤＬ命令转换成ＳＱＬ语句的翻译算法以及使用ＳＱＬ实现支持导航式查找的指针层次管理方法．文中讨论的Ｃ—ＯＳＤＬ实现技术以及最初的接口设计是面向对象的数据库技术的深入探讨．     

空间结构化查询语言-G/SQL

传统的地理信息系统对空间数据的处理是过程化的,并且不能将空间数据作为一个整体来对待。这种处理方法限制了空间数据应用的发展。空间结构化查询语言扩展了关系数据库的ＳＱＬ语言,朝着结构化的空间数据统一处理迈出了重要的一步。该文讨论了空间结构化查询语言的理论,在ＯＧＩＳ的概念和数据模型之上,提出了一套创新的地理数据模型,采用统一的方法存储和管理空间数据库中的属性数据和几何数据。根据这个模型,实现了一种空间结构化查询语言——Ｇ／ＳＱＬ。Ｇ／ＳＱＬ通过研究地物关系的９－交叉模型确定面向空间数据的扩充的空间算子,为应用程序提供空间拓扑关系谓词和空间函数。应用Ｇ／ＳＱＬ成功地开发了一个基于Ｗｅｂ 的地理信息应用系统ＷｅｂＧＩＳ。实践表明,Ｇ／ＳＱＬ提供的空间关系谓词和空间函数完备而且易于使用。还给出了Ｇ／ＳＱＬ语法的ＢＮＦ表示。     

一种在关系数据库中图的表示及遍历方法

本文针对在数据库应用程序中经常遇到的一类查询，提出了一种在关系数据库中对图进行表示和遍历的方法，并使用ＭＳＳＱＬＳｅｒｅｒ６．５的Ｔ－ＳＱＬ语言实现了遍历过程。     

ORACLE数据库应用系统的一种优化方法

查询优化是数据库设计是要考虑的重要方面,使用ＳＱＬ进行数据库查询时,也有许多影响性能的因素。本文讨论了在ＯＲＡＣＬＥ应用系统中如何用优化应用性能的诊断工具Ｅｘｐｌａｉｎ来优化ＳＱＬ语句的方法。     

MSQL—基于SQL的多媒体查询语言

本文在标准结构化查询语言ＳＱＬ的基础上，扩展了其对多媒体数据的查询能力，设计出一种新型的数据库查询语言ＭＳＱＬ。在介绍了ＭＳＱＬ的基本数据模型后，给出了ＳＭＱＬ语言的定义和语法，并举例进行了说明。     

用XML对数据库查询的方法

本文讨论了用ＸＭＬ查询数据库的具体实现方法。首先,提出了用ＤＴＤ描述关系数据模式和利用ＡＳＰ技术转化数据库的数据成ＸＭＬ文档方法;然后,用ＸＭＬ的查询语言ＸＭＬ－ＱＬ完成Ｗｅｂ数据库上查询和数据集成等操作。     

Web数据管理与Web查询语言

本文对基于Ｗｅｂ文档内容和Ｗｅｂ文档结构的查询语言ＷｅｂＳＱＬ和ＷｅｂＯＱＬ从数据模型的角度对其优缺点加以分析,并阐述了Ｗｅｂ查询语言对Ｗｅｂ信息的提取与集成、Ｗｅｂ站点的重构及半结构化数据的支持。     

Web数据库应用实例

本文提供一个具体的实例来了解如何通过ＩＤＣ和 ＡＳＰ进行数据库编程。实例是在某主页上有一个 通过姓名来查询教师详细信息的链接,其查询的过程将分别使用ＩＤＣ和ＡＳＰ来实现。其开发环境如下：操作系统是Ｍｉｃｒｏｓｏｆｔ Ｗｉｎｄｏｗｓ ＮＴ ４．０;Ｗｅｂ服务器是ＩＩＳ ３．０; 浏览器是 ＩＥ ５． ０;后台数据库是 ＳＱＬ Ｓｅｒｖｅｒ;相应的ＯＤＢＣ Ｄｒｉｖｅｒ是 ＳＱＬ Ｄｒｉｖｅｒ（当然如果数据库 Ｗｅｂ应用 的访问人数不太密集,那么后台数据库选用Ｍｉｃｒｏｓｏｆｔ Ａｃｃｅｓｓ 就足够了;但如果访问数据…     

如何发挥ORACLE的优化功能

对于一个庞大的数据库，数据的检索优化至关重要，为此，详细讨论了ＯＲＡＣＬＥ数据库中查询语言ＳＱＬ等的优化处理，旨在提高ＯＲＡＣＬＥ数据库的执行效率。     

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     

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。