基于SDE的数据库应用研究

空间数据引擎是实现空间数据库的核心，以空间数据引擎的标准与功能为分析起点，以其空间数据存储模型，图层管理为分析重点，并结合数据库管理系统与客户端应用程序，对空间数据库技术的理论体系进行了较为全面的论述。通过在“重庆市土壤信息系统”中的实现与应用，证明了空间数据库技术在土壤信息系统中运用的可行性。     

基于SDE的数据库应用研究

空间数据引擎是实现空间数据库的核心.以空间数据引擎的标准与功能为分析起点,以其空间数据存储模型、图层管理为分析重点,并结合数据库管理系统与客户端应用程序,对空间数据库技术的理论体系进行了较为全面的论述.通过在"重庆市土壤信息系统"中的实现与应用,证明了空间数据库技术在土壤信息系统中运用的可行性.     

基于ArcSDE道路信息管理系统的设计与实现

空间数掂库引擎是实现空间数据库的核心，能有效存储和管理空间数据。文章以空间数据库引擎技术的研究为起点，对ArcSDE技术的理论体系进行阐述，并开发了基于ArcSDE的道路信息管理系统，证明了ArcSDE技术在道路信息系统中运用的可行性，解决了GIS应用与空间数据库集成的制约瓶颈问题，实现了海量、分布式空间数据的有效管理。     

基于SDE的空间数据库的研究与实现

GIS的核心是空间数据库。本文在介绍空间数据库的基本概念的基础上，着重分析说明了ESRI公司的空间数据库引擎SDE（Spatial Database Engine），它能将空间数据和属性数据集成在数据库中。分析了GIS中空间数据模型，并以湘江流域水环境地理信息系统为例，介绍大型分布式网络GIS系统中空间数据库的设计及其实现。     

实现ArcSDE向Oracle9i Spatial空间数据的转换

通过空间数据库引擎技术(SDE)可以有效地实现空间数据在数据库中的管理。但各种空间数据库引擎在储存数据格式上的不一致,影响各引擎相互间数据操作的效率。为了解决这一问题,以ESRI公司的ArcSDE和Oracle公司的Oracles Spatial为例,通过分析以上两种空间数据库引擎的数据格式,解决了从AreSDE向Oracle9i Spatial的空间数据的转换。     

基于ArcSDE与OracleSpatial集成技术的空间数据设计方法

针对当前空间数据库随着数据量增大和数据种类增多运行效率降低的问题,该文通过分析当前的空间数据库和空间数据引擎技术,提出一种基于ArcSDE和Oracle Spatial集成技术的空间数据库设计方法。通过对空间数据库里的不同格式的数据进行合理组织,从而实现提高空间数据库的性能和效率的目的。     

国产数据库空间信息管理系统的发展

空间信息技术的发展，信息基础设施建设包括数据的整合、更新等的完善和深入，各种空间数据量的成倍增长，对发展数据库化空间信息系统提出了急切要求。本文结合应用推广国产数据库实际工作和当今国内外数据库及空间信息系统管理模式和技术发展，阐述了数据库与GIS的有机结合和捆绑发展的主要因素、现状、优越性和发展趋势。     

基于RDBMS的地理信息集成数据库系统

在介绍空间数据库基本概念的基础上，分析了ESR的空间数据库引擎SDE（Spatial Database Engine)，提出了一种空间数据库结构模型，将空间数据和属性数据集成在数据库中，分析了数据模型体系结构，数据组织以及空间图形要素表达，进而根据该结构模型实现了在关系型数据库中对空间图形数据进行表示，存储和分析的操作。     

空间数据的混合树索引结构与访问引擎的研究

通过对空间数据库系统关键技术的研究,改进了空间数据索引结构,设计实现了基于2K叉树与R-树的混合树索引结构,提高了空间数据的访问效率,并通过实验验证了该结构的正确性与有效性;同时,在混合树空间索引结构的基础上,设计实现了一个符合OpenGIS规范的空间数据库访问引擎,它能有效地支持空间数据的存储与管理,并为数据共享和系统互操作打下了基础.该数据访问引擎在应用实践中也取得了较好的效果.     

SDE的实体-关系模型空间数据管理方式研究

SDE(SpatialDatabaseEngine)空间数据库引擎是应用面向对象方法和关系理论,在管理空间数据中开发的超大型空间数据库管理器。研究了SDE的体系结构、表结构,分析了基于实体-关系模型的SDE特点,给出管理空间数据的实现方法。     

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.