基于DHTML和RDO的Web数据库开发技术

对目前用的ＣＧＩ,ＡＳＰ等开发ＷＥＢ数据库的方法进行了分析比较,说明了产特点,进而 基于ＤＨＴＭＬ和ＲＤＯ技术的ＷＥＢ数据库开发技术,介绍了一种使用微软Ｖｉｓｕａｌ Ｂａｓｉｃ６．０集成开发工具结合ＤＨＴＭＬ技术开发ＷＥＢ数据库的具体方法,最后通过实例文章说明了如何将该技术使用于实际的ＷＥＢ数据库的开发中。     

面向对象的电力系统接线图动态配置软件

介绍了电力系统接线图动态配置软件的实现方法 ,并重点阐述了面向对象编程技术在软件开发中的实际应用 ,同时结合农电网的特点和需要 ,给出了电力系统接线图元件类的具体定义。应用实践表明 ,本软件具有操作方便、实用简单、移植性好的特点     

一个图像数据库检索系统的结构设计和快速检索方法

本文介绍了图像数据库区别于常规数据库的特点,并以数字化图书馆的数据库子系统Basestar为例,介绍了图像数据库检索系统的结构和检索方法。Basestar采用综合了颜色、形状、纹理三种特征矢量的综合性检索方法,本文详细介绍了这种方法,并论述了在此方法基础上,根据三角形不等式准则改进而成的检索方法的原理和实现。实验证明Basestar 系统具有较好的检索效果,检索结果证明快速检索方法是有效的。     

数据库应用程序执行过程抽象

本文对数据库应用的执行流程进行了一个抽象,指出数据库应用流程通常都具有的几个步骤,从而使数据库应用程序的开发过程中可以更加有效的进行设计和实现。     

Incremental View Maintenance for Mobile Databases

In a mobile environment, querying a database at a stationary server from a mobile client is expensive due to the limited bandwidth of a wireless channel and the instability of the wireless network. We address this problem by maintaining a materialized view in a mobile client's local storage. Such a materialized view can be considered as a data warehouse. The materialized view contains results of common queries in which the mobile client is interested. In this paper, we address the view update problem for maintaining the consistency between a materialized view at a mobile client and the database server. The content of a materialized view could become incoherent with that at the database server when the content of the database server and/or when the location of the client is changed. Existing view update mechanisms are ‘push-based’. The server is responsible for notifying all clients whose views might be affected by the changes in database or the mobility of the client. This is not appropriate in a mobile environment due to the frequent wireless channel disconnection. Furthermore, it is not easy for a server to keep track of client movements to update individual client location-dependent views. We propose a ‘pull-based’ approach that allows a materialized view to be updated at a client in an incremental manner, requiring a client to request changes to its view from the server. We demonstrate the feasibility of our approach with experimental results. Received 27 January 1999 / Revised 26 November 1999 / Accepted 17 April 2000     

A Parametric Texture Model Based on Joint Statistics of Complex Wavelet Coefficients

We present a universal statistical model for texture images in the context of an overcomplete complex wavelet transform. The model is parameterized by a set of statistics computed on pairs of coefficients corresponding to basis functions at adjacent spatial locations, orientations, and scales. We develop an efficient algorithm for synthesizing random images subject to these constraints, by iteratively projecting onto the set of images satisfying each constraint, and we use this to test the perceptual validity of the model. In particular, we demonstrate the necessity of subgroups of the parameter set by showing examples of texture synthesis that fail when those parameters are removed from the set. We also demonstrate the power of our model by successfully synthesizing examples drawn from a diverse collection of artificial and natural textures.     

面向对象图形系统的实现

论述了面向对象图形系统的一般要求及原理,并在此基础上结合一个具体的工程ＣＡＤ应用实例系统,阐述了面向对象图形系统的实现方法。     

基于JDBC和ODBC的网络数据库开发

研究了ＯＤＢＣ和ＪＤＢＣ的技术支持和应用方法,提出了利用Ｊａｖａ语言的体系结构无关性和动态性设计Ｂｒｏｗｓｅｒ／Ｓｅｒｖｅｒ模式系统,实现跨平台、兼容多种数据库的网络信息系统开发思想。     

基于ISAPI的Web信息发布

讨论了几种Ｗｅｂ数据库互连技术,并通过一个实际的例子介绍了基于ＩＳＡＰＩ的Ｗｅｂ信息发布的基本原理和实现方法。     

总线型企业信息系统体系结构设计及应用

文中介绍了一种基于网络的新型信息系统构架－总线型信息系统结构。随着计算机软硬件和网络技术的发展,信息系统网络化和系统构架的研究工作成为领域内研究的热点。总线型信息系统从计算机网络化的角度出发研究系统的构建技术,提出了全新的系统结构和开发模型。这个模型有着较好的层次结构和可扩展,可维护性,并对电子审批等应用技术提供了简洁的解决方案,按照该结构设计的信息系统已在一个大型化工企业实现,取得了经济效益。