搜索引擎及其性能改进方法研究

搜索引擎技术的出现为Web用户在浩如烟海的WWW上快速发现、定位信息带来了福音,目前搜索引擎已是WWW上除E‐mail之外使用最多的服务。目前搜索引擎面临的主要困难是检索质量不佳,用户满意度不高。通过分析“天网”搜索引擎的日志,探寻用户访问一般性规律,并从分析结果出发对搜索引擎进行改造。     

Web2.0环境下搜索引擎的个性化服务及其模式研究

从简要介绍Web2.0环境下搜索引擎的个性化服务方式入手,探讨Web2.0环境下搜索引擎的个性化服务内容、技术、资源和功能,并重点对搜索引擎的个性化服务模式进行研究,提出了个性化首页集成模式、工具条嵌入模式和浏览器辅助模式,并运用实例对3种模式进行分析,最后指出了Web2.0环境下搜索引擎的个性化服务及其模式的未来发展方向。     

基于主题爬虫的个性化搜索引擎技术研究

基于主题爬虫的个性化搜索引擎技术,借鉴Web个性化推荐服务思路,改善了以搜索引擎为代表的Web信息检索系统服务方式,有效地解决了Internet上"资源过载"和"信息迷失"的问题,相对满足了用户的需求。概述了网络爬虫和个性化搜索引擎,并对基于主题爬虫的个性化搜索引擎技术进行了介绍研究。     

基于MVC模型的Web元搜索引擎

本文首先讲述了元搜索引擎的原理;然后,分析了Java技术实现元搜索引擎的可能性及优势所在,并引入Model—View—Controller多层Web应用模型;最后,给出基于该模型实现一个高效、稳定、可扩展的Web元搜索引擎的关键技术。     

Web搜索引擎与全文检索技术

本文主要阐述了全文检索技术在Web搜索引擎中的应用。对国内Web搜索引擎的全文检索技术中的不足进行了分析和思考并提出解决办法，同时对web搜索引擎中的全文检索技术的发展提出了自己的观点。     

基于广度优先搜索的网络蜘蛛设计

网络蜘蛛搜索策略的研究是近年来专业搜索引擎研究的焦点之一,如何使搜索引擎快速准确地从庞大的网页数据中获取所需资源的需求是目前所面临的重要问题。重点阐述了搜索引擎的Web Spider（网络蜘蛛）的搜索策略和搜索优化措施,提出了一种简单的基于广度优先算法的网络蜘蛛设计方案,并分析了设计过程中的优化措施。     

搜索引擎系统中的Web个性化信息推荐技术

Web个性化推荐技术在现代互联网中有着广泛的应用,它能将Web网络信息按照用户的个性化需求主动地向用户提供服务。但是由于现代搜索引擎通常缺乏用户的相关登录信息和网页访问路径信息,所以传统的Web个性化推荐服务并不完全适用于搜索引擎。由于用户在访问搜索引擎时会产生大量的关键词访问序列,而这种关键词访问序列蕴含着丰富的用户个性化信息,基于此,提出了一种利用搜索引擎访问日志中的关键词访问序列来进行Web个性化推荐服务的方法,并分析了相关技术特点和实现细节。     

基于语义Web Service的Deep Web动态竞争情报采集

Deep Web信息资源动态性强、质量高、易于深度分析,使得它成为企业竞争情报采集的重要信息源.但是,目前各种搜索引擎及主题指南等工具不能对Deep Web信息资源有效地进行采集.因此,提出了基于语义Web Setvice的Deep Web的企业动态竞争智能采集体系框架结构,并对该框架下的动态竞争情报采集过程进行了详细论述.     

GoWeb:基于GO和MeSH的生物医学搜索引擎研究

本文对基于基因本体(Gene Ontology.Go)和医学主题词表(MeSH)的生物医学专业搜索引擎Go Web曲从其结构、原理、检索方法,以及与其它搜索引擎的比较等方面展开研究,最后发现Go Web比综合性搜索引擎在搜索专业医学资源方面要好,比专业搜索引擎搜索到资源要及时,其最大的特点是对搜索结果进行了专业的分类,起到了导航作用,并能使检索者很快找到自己需要的内容.     

搜索引擎与联机情报检索之比较

自1994年第一个Web搜索引擎出现以来，Internet上的查询方式焕然一新。而今，数百个Web搜索引擎已构成Internet的主要查询工具，传统图书情报意义上的检索系统也纷纷Web化，使Web搜索引擎成为当今信息检索的主流形式。搜索引擎实际上是一个专用的WWW服务器，它收集Internet网上成千上万甚至上亿个网页信息．组成庞大的索引数据库。     

Web search engine multimedia functionality

Web search engines are beginning to offer access to multimedia searching, including audio, video and image searching. In this paper we report findings from a study examining the state of multimedia search functionality on major general and specialized Web search engines. We investigated 102 Web search engines to examine: (1) how many Web search engines offer multimedia searching, (2) the type of multimedia search functionality and methods offered, such as “query by example”, and (3) the supports for personalization or customization which are accessible as advanced search. Findings include: (1) few major Web search engines offer multimedia searching and (2) multimedia Web search functionality is generally limited. Our findings show that despite the increasing level of interest in multimedia Web search, those few Web search engines offering multimedia Web search, provide limited multimedia search functionality. Keywords are still the only means of multimedia retrieval, while other methods such as “query by example” are offered by less than 1% of Web search engines examined.     

Multimedia search capabilities of Chinese language search engines

This paper reports results from a study exploring the multimedia search functionality of Chinese language search engines. Web searching in Chinese (Mandarin) is a growing research area and a technical challenge for popular commercial Web search engines. Few studies have been conducted on Chinese language search engines. We investigate two research questions: which Chinese language search engines provide multimedia searching, and what multimedia search functionalities are available in Chinese language Web search engines. Specifically, we examine each Web search engine’s (1) features permitting Chinese language multimedia searches, (2) extent of search personalization and user control of multimedia search variables, and (3) the relationships between Web search engines and their features in the Chinese context. Key findings show that Chinese language Web search engines offer limited multimedia search functionality, and general search engines provide a wider range of features than specialized multimedia search engines. Study results have implications for Chinese Web users, Website designers and Web search engine developers.     

How are we searching the World Wide Web? A comparison of nine search engine transaction logs

The Web and especially major Web search engines are essential tools in the quest to locate online information for many people. This paper reports results from research that examines characteristics and changes in Web searching from nine studies of five Web search engines based in the US and Europe. We compare interactions occurring between users and Web search engines from the perspectives of session length, query length, query complexity, and content viewed among the Web search engines. The results of our research shows (1) users are viewing fewer result pages, (2) searchers on US-based Web search engines use more query operators than searchers on European-based search engines, (3) there are statistically significant differences in the use of Boolean operators and result pages viewed, and (4) one cannot necessary apply results from studies of one particular Web search engine to another Web search engine. The wide spread use of Web search engines, employment of simple queries, and decreased viewing of result pages may have resulted from algorithmic enhancements by Web search engine companies. We discuss the implications of the findings for the development of Web search engines and design of online content.     

电子政务网络影响力评估与提升策略研究——以广东省21个市政府为例

文章利用层次分析法和链接分析法确定了电子政务网络影响力的评估体系,提出如何合理利用商业搜索引擎搜集数据,并对广东省21个市级政府的网络影响力进行了测评,结合评估结果提出提升电子政务网络影响力的策略方法。     

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.     

Music search engines: Specifications and challenges

Nowadays we have a proliferation of music data available over the Web. One of the imperative challenges is how to search these vast, global-scale musical resources to find preferred music. Recent research has envisaged the notion of music search engines (MSEs) that allow for searching preferred music over the Web. In this paper, we examine the growing research topic of MSEs, and provide potential specifications to follow and challenges to face.     

Comparing rankings of search results on the Web

The Web has become an information source for professional data gathering. Because of the vast amounts of information on almost all topics, one cannot systematically go over the whole set of results, and therefore must rely on the ordering of the results by the search engine. It is well known that search engines on the Web have low overlap in terms of coverage. In this study we measure how similar are the rankings of search engines on the overlapping results.We compare rankings of results for identical queries retrieved from several search engines. The method is based only on the set of URLs that appear in the answer sets of the engines being compared. For comparing the similarity of rankings of two search engines, the Spearman correlation coefficient is computed. When comparing more than two sets Kendall’s W is used. These are well-known measures and the statistical significance of the results can be computed. The methods are demonstrated on a set of 15 queries that were submitted to four large Web search engines. The findings indicate that the large public search engines on the Web employ considerably different ranking algorithms.     

中国省会城市政府网站链接分析

运用网络链接分析方法,利用AllTheWeb与AltaVista两种搜索引擎,分别计算出中国大陆地区27个省会城市政府网站的总链接数、站外链接数、网页数以及总网络影响因子(WIFt)和站外网络影响因子(WIFe);并结合政府网站的特点计算出非政府网站链接数以及非政府网站网络影响因子(WIFc)、GDP网络影响因子(WIFg)、人口网络影响因子(WIFr)和人均GDP网络影响因子(WIFj).将这3种链接数与6种网络影响因子分别与政府网站排名得分进行相关性分析,初步确定总链接数可以作为评价政府网站的一项指标,并讨论了现阶段网络链接分析存在的一些问题以及未来的发展趋势.     

Search engine coverage bias: evidence and possible causes

Commercial search engines are now playing an increasingly important role in Web information dissemination and access. Of particular interest to business and national governments is whether the big engines have coverage biased towards the US or other countries. In our study we tested for national biases in three major search engines and found significant differences in their coverage of commercial Web sites. The US sites were much better covered than the others in the study: sites from China, Taiwan and Singapore. We then examined the possible technical causes of the differences and found that the language of a site does not affect its coverage by search engines. However, the visibility of a site, measured by the number of links to it, affects its chance to be covered by search engines. We conclude that the coverage bias does exist but this is due not to deliberate choices of the search engines but occurs as a natural result of cumulative advantage effects of US sites on the Web. Nevertheless, the bias remains a cause for international concern.     

Web搜索引擎技术的研究与展望

本文简要介绍和比较了多种不同Web搜索引擎的工怍机制及其优缺点，并在此基础上对新一代搜索引擎技术进行讨论与展望。