Correlation-Based Web Document Clustering for Adaptive Web Interface Design

A great challenge for web site designers is how to ensure users' easy access to important web pages efficiently. In this paper we present a clustering-based approach to address this problem. Our approach to this challenge is to perform efficient and effective correlation analysis based on web logs and construct clusters of web pages to reflect the co-visit behavior of web site users. We present a novel approach for adapting previous clustering algorithms that are designed for databases in the problem domain of web page clustering, and show that our new methods can generate high-quality clusters for very large web logs when previous methods fail. Based on the high-quality clustering results, we then apply the data-mined clustering knowledge to the problem of adapting web interfaces to improve users' performance. We develop an automatic method for web interface adaptation: by introducing index pages that minimize overall user browsing costs. The index pages are aimed at providing short cuts for users to ensure that users get to their objective web pages fast, and we solve a previously open problem of how to determine an optimal number of index pages. We empirically show that our approach performs better than many of the previous algorithms based on experiments on several realistic web log files. Received 25 November 2000 / Revised 15 March 2001 / Accepted in revised form 14 May 2001     

Acquiring Customers' Requirementsin Electronic Commerce

A key role for Artificial Intelligencetechnology in electronic commerce is in findingproducts and services that meet a user'srequirements. This may be implemented as athree-stage process of requirementselicitation, product search, and finallyproduct presentation. Alternatively the searchof the product space may happen in tandem withthe requirements elicitation process. It isalso possible to use product presentation as amechanism to focus and give context torequirements elicitation. A variety ofdifferent approaches to this issue of matchingproducts to requirements have been explored inAI research. Thus, while the focus in thispaper is on different approaches torequirements elicitation, these related issuesof product search and product presentation arealso discussed in detail. The paper concludesby placing the other papers in this specialissue in the context of this structuredoverview.     

老井重钻小眼井技术特点及问题分析

针对中原油田老井特点,对Φ１３９．７套管内老井重钻进行了分析。根据１０余口井的施工情况,重点介绍了Φ１３９．７套管定向开窗侧钻小眼井的工程设计,定向开窗,轨迹控制,钻头使用,钻井方式对比,扩眼效果分析,井下安全预防措施及完井工艺等钻井技术特点。针对现存问题进行分析并提出了几点建议。     

Integration of automatic mapping/facility management in distribution system analysis

This paper presents the use of an Automatic Mapping/Facility Management (AM/FM) system for distribution system analysis and design. The AM/FM provides an environment for building a database which contains both graphic information and non-graphic facility data. This database can be used by various departments for engineering analysis, accounting, inventory, map production, and so forth. This system can be used to retrieve facility data from the database and support different applications such as system analysis or planning. With the state-of-the-art graphic user interface (GUI), output results of the application can be shown on the screen along with the graphic displays of the system that includes the geographic information. In this paper, the integration of the AM/FM is illustrated by a three-phase load flow program, that is, a very precise and sophisticated three-phase distribution system model was used. It is also shown that a statistical report of facilities can be easily built with the aid of the AM/FM.     

非测地线稳定缠绕的边界条件及稳定方程

依据微分几何理论推导出非测地线缠绕的纤维稳定方程，给出了稳定的边界条件。对几种典型芯模的稳定缠绕进行了讨论。为编制缠绕软件奠定了理论基础。     

一种用户界面设计方法

本文讨论了用户界面设计的原则，总结了ＣＡＤ／ＣＡＭ系统用户界面的特点，提出一种用户界面模型及其实现方法，在该用户面模型中，选单结构，选单生成机制和命令控制方式是基于开发用户界面实践过程建立起来的，该选单结构与选单生成机制相结合，大大简化了应用程序和界面的装配，只须要修改选单文件即可实现选单的重新布局和调整，该命令控制方法主要研究循环命令的控制，多种方式控制和多层命令控制。     

一个大型机器人仿真系统—ROBCAD

在论述国内外机器人CAD、仿真以及离线编程技术发展的基础上,介绍了机器人仿真系统-ROBCAD.阐述了ROBCAD 在国际机器人仿真领域的地位及先进性,开发了ROBCAD 的主要功能,分析研究了其关键技术,指出了国内这方面研究中的不足以及今后的发展方向。     

航天飞机三维最优再入轨道及气动加热过程

本文应用现代控制理论研究了航天飞行器三维最优再入轨道和与轨道参数密切相关的气动加热过程。文中选择飞行器迎角和倾斜角作为控制变量,以飞行器气动加热率和飞行过载沿轨道积分最小作为优化性能指标,按极大原理导出了最优再入轨道有约束控制的非线性两点边值问题。采用了数值优化法——共振梯度法求解了有升力飞行器的最优再入轨道及其热过程。文中以允许误差法讨论了权系数和罚函数的选取方法;对不同速度范围研究了不同的加热模型,按热平衡方程与优化轨道同步迭代的方法求得了算例数值结果。算例的数值结果与文献[9]的数值是一致的。     

战术弹道导弹再入段弹道仿真设计

在拦截TBM作战仿真系统中,需要模拟TBM再入段的弹道.文中在简化的大气模型下建立TBM的再入段方程,并采用龙格-库塔法来求解,通过仿真,可以看出模型符合仿真需要.     

高速旋转弹丸外弹道修正分析及数学模型的建立

跟踪国际智能弹道修正弹药前沿，针对高速旋转的弹丸，文中在介绍压电效应产生机理的基础上，分析了基于压电陶瓷智能材料的弹头修正技术方案．阐述了其机构组成和工作原理．并建立了修正弹丸的外弹道数学模型。