GIS的空间数据在关系型数据库的实现理论及应用技术

介绍了地理信息系统（GIS）中属性数据和空间数据传统的存储方式，以及这种存储方式给分布式应用系统开发带来的诸多问题，对OracleSpatial技术进行了分析，详细阐述了这种先进的解决方案和如何实现属性数据和空间数据一体存储的理论细节，进而提出了基于该项技术应用系统的开放方法。     

基于Oracle Spatial的GIS空间数据处理及应用系统开发

从介绍地理信息系统（GIS）中属性数据和空间数据的传统的存储方式，以及这种存储方式给分布式应用系统开发带来的诸多问题开始，对Oracle Spatial技术进行了分析。详细阐述了这种先进的解决方案和如何实现属性数据和空间数据一体化存储的理论细节，进而提出了基于该项技术的应用系统的开发方法。     

GIS空间数据存入Oracle9 Spatial

介绍地理信息系统mapinfor的属性数据和空间数据传统的数据库存储方式。并Oracle Spatial空间数据存储技术进行了分析,阐述如何实现属性数据和空间数据一体化存储的理论细节,进而提出了基于该项技术应用系统的开发方法。     

GIS空间数据与属性数据的存储结构研究

对GIS中所涉及的各要素进行抽象,并给出其存储结构,在此基础上提出了整体GIS空间数据与属性数据的存储结构,包括逻辑存储结构和物理存储结构。采用层次模型和关系模型相结合的记录式文件系统来对空间数据和属性数据进行存取,并结合索引和数据字典技术加快了数据的存取速度,解决了传统GIS中空间数据和属性数据分开存储带来的问题,提高了大数据量的GIS应用的存取效率。     

基于ArcSDE的空间数据库研究与应用

实现空间数据和属性数据的一体化存储和管理是构建GIS应用系统的关键.本文以ArcSDE为空间数据引擎,用Ora-cle 9i数据库管理数据,实现了空间数据和属性数据的有效组织和管理,在小流域坝系监测信息查询系统项目中得到了很好的应用.     

基于Oracle Spatial的税收征管空间数据库的设计与实现

传统税收征管信息系统普遍存在空间数据利用率低、空间数据与属性数据单独存储、空间数据存储和访问的效率较低等问题。采用Oracle Spatial可以有效地组织空间数据和属性数据,并对两者进行统一管理,有效地提高了空间数据的存储和查询效率,并为税收征管WebGIS系统的建立奠定了基础。本文介绍了Oracle Spatial的运行机制与原理,详细阐述了基于Oracle Spatial的税收空间数据库(TAXSDB)的设计和实现过程,并提出了TAXSDB的优化策略。     

基于Oracle Spatial技术的地理信息管理与优化

针对MapX组件在管理地理信息时空间数据与属性数据相分离、数据管理及查询效率不高的问题,通过引入OracleSpatial空间数据管理技术,实现了属性数据和空间数据的一体化存储与管理。利用空间操作符进行空间邻近分析,提高了系统的稳定性和数据的查询速率,并针对空间数据转换时造成的信息丢失问题提出解决方法。该技术方案在航油公司EAM(enterprise asset management)系统中得到应用,并取得较好效果。     

基于SQL Server外挂空间数据库的设计与实现

以SQL Server 2000为后台数据库服务器，设计并实现了GeoView的外挂控制数据库，在空间数据库开发设计过程中采有了面向对象技术方法和C／S体系结构，通过对图形数据的分析，实现了空间数据和属性数据在关系数据库中的统一存储，基于分布式数据库管理系统的GeoView系统，将随之具有多用户特征，完善的RDBMS也为所存储的空间数据和属性数据提供标准化依据。     

Hibernate技术在基于GIS数据库中的应用研究

空间信息的存储和处理问题是地理信息系统(GIS)的核心问题.对空间数据和属性数据的统一存储管理已成为必然趋势.本文通过对GIS中海量数据的存储方式进行研究,指出对象-关系型的数据库存储方式是空间数据库的发展方向.在此基础上讨论了Hibernate技术与GIS数据库的结合,使用Hibernate技术将关系数据库中空间数据和属性数据进行封装,屏蔽了数据库底层操作,使得程序员可以用面向对象的思想随意操纵数据库,在利用了关系数据库的快速检索、查询能力的同时也增强了数据的一致性和可移植性.     

基于GeoDatabase和ArcSDE的湿地GIS数据库

以松嫩湿地为背景,介绍了GeoDatabase结合ArcSDE技术建立GIS数据库的方法,详细阐述了如何实现属性数据和空间数据一体化存储的理论细节,在此基础上提出了两者的改进连接方案;同时将该方法与传统的GIS数据存储方式相比较来说明其先进性。进而通过实例证明了此数据库技术在应用系统开发中的实用性。     

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.