<Emphasis Type="Bold">A Web-Based Product Modelling Tool – A Preliminary Development</Emphasis>

This paper presents the preliminary development of a Web-based Product Modelling Tool (WPMT) aimed at enabling collaborative design through the Internet using JAVA 3D with dispersed team members. It is motivated by the emerging need of distant collaborative design required among R&D centres and manufacturers of global-based enterprises, simply to shorten product cycle time and, hence, to enhance their world-wide competitiveness. In this paper, current web 3D technologies are discussed first, then the general architecture of the underlying WPMT is introduced. The proposed WPMT is developed to allow designers/users to create, view, and manipulate product models through the World Wide Web. The main architecture of the proposed WPMT uses a Java servlet embedded in an HTML web page, which can be viewed and edited by authorised users with a Java/Java 3D enabled browser through the Internet. The developed WPMT is to be run on a Java Virtual Machine (JVM), so it is independent of the operation system and computer platform. Since the WPMT is a web-based modelling tool, some handy built-in primary features such as block, wedge, rim, hole, pocket, etc. are included for users to develop their product models. The users can also create their own features as so-called user-defined features. In addition, viewing operations such as rotation, zooming, panning, orthographic projections and so on, are also made available for comprehensiveness in the integrated web-based solid modelling tool. Finally, the proposed WPMT is experimentally implemented.     

InfServer:一个基于分布计算环境的智能推理服务软件

介绍了一个基于分布计算环境的智能推理服务条件ＩｎｆＳｅｖｅｒ。     

As I Sit Studying: WWW-Based Reference Services

Abstract

This article reports on the current state of reference services on the World Wide Web (WWW). It explains what a WWW-based reference service is, describes several models of handling requests, and explores the impact of these services on traditional reference services. Based upon anecdotal information the author concludes that, to date, Web-based reference services have had little impact upon traditional reference services.     

Prediction of Web Page Accesses by Proxy Server Log

As the population of web users grows, the variety of user behaviors on accessing information also grows, which has a great impact on the network utilization. Recently, many efforts have been made to analyze user behaviors on the WWW. In this paper, we represent user behaviors by sequences of consecutive web page accesses, derived from the access log of a proxy server. Moreover, the frequent sequences are discovered and organized as an index. Based on the index, we propose a scheme for predicting user requests and a proxy-based framework for prefetching web pages. We perform experiments on real data. The results show that our approach makes the predictions with a high degree of accuracy with little overhead. In the experiments, the best hit ratio of the prediction achieves 75.69%, while the longest time to make a prediction only requires 2.3 ms.     

中英文WWW搜索引擎中数据获取的设计与实现

Ｉｎｔｅｒｎｅｔ在我国的迅速发展和ＷＷＷ上的信息量不断增长,迫切需要人们开发中英文兼容的ＷＷＷ搜索引警。本文对中英文ＷＷＷ搜索引擎中数据获取的总体设计思想,设计的实现技术作了较为具体的讨论和分析,并陈述了我们所做的工作。     

负载平衡技术及其应用

WWW系统需要具备很好的可伸缩性，即系统不仅要具有很高的吞吐率，而且需要有很好的响应时间。基于分布式处理的负载平衡技术由于同时具有提升这两方面的能力，被广泛应用于众多WWW系统中。本文在分析当前WWW系统中几种常用负载平衡技术的基础上，着重介绍了基于Windows Network Load Balancing的配置方法和过程。     

一种提高CGI程序性能的方法

本文探讨了在ＷＷＷ中用动态库界面代替原有的ＣＧＩ界面，以提高服务器的性能，并简单介绍了如何在软件ＮＣＳＡｈｔｔｐｄ的基础上实际这一目标。     

网站孤立文件及其形成机制分析

孤立文件(Isolated Web Files,IWF)存在于WEB服务目录中,具有完整有效的URL地址.该文件不能通过正常的超级链接或非磁盘文件遍历方式的网站搜索结果所取得,而仅能输入准确URL地址进行访问.孤立文件不仅浪费服务器的存储空间、危害系统安全,而且可能导致泄密、引发著作权纠纷或侵犯隐私等问题发生.孤立文件...     

JDBC-Java数据库接口及应用

该论文主要从ＪＤＢＣ的概念，组织结构和工作机制诸方面介绍了Ｊａｖａ语言的数据库接口原理，Ｊａｖａ具备和流行的商业数据库集成的能力，加上其本身面向网的多种特性，使之可以构成一种理想的客户／服务器计算环境。最后，描述一个实验系统的实现，验证ＪＤＢＣ应用在扩展ＷＷＷ服务功能方面的可行性。