智能搜索引擎与数字图书馆个性化服务

智能搜索引擎基于知识(概念)层面实行信息检索，以较强的自然语言理解和知识处理能力，表现出良好的个性化信息服务特色。因此，智能搜索引擎应用于数字图书馆个性化服务体系，不仅有效发挥前者数据挖掘、知识发现的功能，同时能较大地加深后者的主动性、智能性优势。     

A study of results overlap and uniqueness among major Web search engines

The performance and capabilities of Web search engines is an important and significant area of research. Millions of people world wide use Web search engines very day. This paper reports the results of a major study examining the overlap among results retrieved by multiple Web search engines for a large set of more than 10,000 queries. Previous smaller studies have discussed a lack of overlap in results returned by Web search engines for the same queries. The goal of the current study was to conduct a large-scale study to measure the overlap of search results on the first result page (both non-sponsored and sponsored) across the four most popular Web search engines, at specific points in time using a large number of queries. The Web search engines included in the study were MSN Search, Google, Yahoo! and Ask Jeeves. Our study then compares these results with the first page results retrieved for the same queries by the metasearch engine Dogpile.com. Two sets of randomly selected user-entered queries, one set was 10,316 queries and the other 12,570 queries, from Infospace’s Dogpile.com search engine (the first set was from Dogpile, the second was from across the Infospace Network of search properties were submitted to the four single Web search engines). Findings show that the percent of total results unique to only one of the four Web search engines was 84.9%, shared by two of the three Web search engines was 11.4%, shared by three of the Web search engines was 2.6%, and shared by all four Web search engines was 1.1%. This small degree of overlap shows the significant difference in the way major Web search engines retrieve and rank results in response to given queries. Results point to the value of metasearch engines in Web retrieval to overcome the biases of individual search engines.     

因特网信息检索模式及其优化设想

本文论述了因特网环境下基于超文本的浏览模式和基于搜索引擎的检索模式两种信息检索模式的产生、原理和缺陷。并根据其现存问题及网络资源自身的特点,着重就建立专业性的网络资源指引库、受控语言的引入和使用、“智能代理”的应用、跟踪记录检索路径和内容提示以及使用语义——文献双层数据结构五点优化设想进行了简要分析。     

搜索力经济研究

目前,由搜索引擎所引领的另类网络虚拟经济形态一“搜索力经济”正在迅速崛起。作为互联网新经济的核心价值,搜索力正引领着互联网的现在和未来。本文将对这一“热点区域”对“搜索力经济”的概念、出现原因及引发的变革等相关问题进行分析,帮助读者对互联网的新领域有更深刻的了解。     

网络计量学

本文回顾了计量学的产生和发展的历程，指出在网络环境下网络计量学产生的必然性。并着重探讨了网络计量学的主要特征、研究方法、研究对象范围和在网络环境中的应用。     

垂直网站及其信息服务模式

The paper introduces vertical portals and their information service modes,analyzes the inevitability of their emergence and development, and finally gives some suggestions as to how to do a good job in providing information service through vertical portals.     

基于WEB挖掘的用户个性化配置方案研究

为每一位Web用户提供个性化服务已经成为电子商务网站发展的趋势。本文首先分析了Web挖掘的基本概念和工作流程，在此基础上提出了基于Web访问信息挖掘的用户个性化配置方案模型，并对模型实现的关键技术及其在电子商务中的应用进行了研究。     

超链接网络分析的理论与应用研究

超链接网络分析提供了网络环境中一种新型的计量分析方法，大大拓展了联机网络分析的应用范围，实现了揭示网络环境中由超链接形成的特殊网络结构的目的。本文对超链接网络分析的理论与应用研究进行了简要综述和评价，包括：超链接网络分析的概念、方法、分析技术、数据计量，以及网络计量学的理论研究进展等。     

竞争情报系统监控引擎的研究与设计

在对互联网情报采集存在的问题进行分析的基础上，设计具有监控设定、监控训练、搜索生成、情报搜索、情报过滤、情报分类、变化侦测、分发接口、情报网络、相关反馈等功能的一个监控引擎，可以满足进行持续情报搜索的、推式范式的、全生命周期的互联网竞争情报需求。     

一个基础教育网站搜索引擎的设计与实现

在研究网站元数据的基础上，介绍一个以基础教育网站为检索对象的搜索引擎系统。结合基础教育网站的特点，分析该系统的关键技术，如主题蜘蛛搜索、网站分类、网站信息提取等，并对系统的整体架构、功能模块进行详细描述。