共查询到19条相似文献，搜索用时 93 毫秒
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因特网上的图像搜索引擎 总被引：8，自引：0，他引：8
The operating principle of Web-based image search engines is briefly described. A detailed evaluation of some of image search engines is made. Finally, the paper points out the deficiencies of the present image search engines and their development trend. 相似文献
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搜索引擎中相关性反馈技术 总被引：10，自引：1，他引：10
As an important component of search engines, the relevance feedback system is very effective for improving the performance of search engines. This paper firstly reviews the history of relevance feedback technology in the past 30 years, then introduces 2 major methods in relevance feedback, i. e. term reweighting and query expansion, and discusses the relevance feedback technologies based on vector space model and statistical ranking model. 相似文献
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搜索引擎的发展状况及使用技巧 总被引：7，自引：0，他引：7
The article describes the operating principles and ways of search engines. It also introduces their types, development, existing problems and applying techniques. 相似文献
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从信息资源的分类看搜索引擎的优化 总被引：1，自引：0，他引：1
The traditional infon-nation resources are classified according to scientificness and practicality. However,the classification of Internet information resources pays more attention to practicality while paying equal attention to scien-tificness. This article, starting from the classification methods of the traditional information resources and Intemet informs-lion resources, discusses how to optimize the search engines in classified catalogue retrieval and multiple keyword retrieval. 相似文献
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网络文本数据搜索引擎与搜索技术 总被引：3，自引：0，他引：3
This paper describes the functions, characteristics and operating principles of search engines based on Web text, and the searching and data mining technologies for Web-based text information. Methods of computer-aided text clustering and abstacting are also given. Finally, it gives some guidelines for the assessment of searching quality. 相似文献
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《中国科学院院刊(英文版)》2006,(4)
According to the long-wave theory, the world economy saw a four-phase development driven respectively by industrial engines, namely, te xt il e, ir on an d ste el , ele ct ri cit y pow er a nd petrochemicals, and car-making during the two centu- ries from… 相似文献
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网络信息分类检索问题研究 总被引：4，自引：0，他引：4
This paper studies network information classification retrieval from the theory of information management. With a brief introduction to search engines, it focuses on analyzing the characteristics of network documents and their classification system. Problems in network document classification are pointed out. Suggestions such as constructing a catalog classification search engine system are made. 相似文献
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网络环境下的信息组织研究 总被引：26，自引：1，他引：26
On the basis of the theory and method of conventional literature organization, this paper expounds the development of the theory and method of information organization under the network environment, and discusses how the method of conventional literature organization suits the network information organization and how to construct new methods of information organization according to the characteristics of network information. 相似文献
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Amanda Spink Bernard J. Jansen Chris Blakely Sherry Koshman 《Information processing & management》2006
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. 相似文献
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针对现有搜索引擎的局限性和当前用户的个性化需求,以用户兴趣模型为基础,对个性化元搜索引擎的基本原理和结构、方法及关键技术进行了研究,并在此基础上提出了用户个性化元搜索引擎的简单实现。 相似文献
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搜索引擎的商业行为分析与思考 总被引：6，自引：0，他引：6
随着搜索引擎相互之间竞争的加剧，许多搜索引擎开始选择商业化发展路线。在本文中，分析了当前搜索引擎商业化发展出现的原因，探讨了搜索引擎商业活动的主要模式，并对未来搜索引擎商业发展中出现的问题提出初步的思考。 相似文献
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本文从图书馆的实际出发,详细阐述了整合检索的功能,并以Metalib为例分别从程序架构,元数据的交换方式以及检索结果的处理等3个角度介绍和分析了整合检索涉及的关键技术及其在实际中的应用. 相似文献
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运用文献计量的方法对我国搜索引擎领域的相关文献进行多角度的定量和定性分析,明晰搜索引擎研究领域的主要研究机构、核心作者和核心期刊,并通过论文关键词和主题分析,发现目前的研究热点主要集中于4个方面:(1)搜索引擎的基本原理和关键技术;(2)元、垂直、个性和智能等4种搜索引擎研究;(3)搜索引擎的应用及商业盈利;(4)搜索引擎相关的知识产权等法律问题4个方面。 相似文献
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互联网搜索引擎及其功能优化模型 总被引：13，自引：0，他引：13
本文在分析互联网搜索引擎的工作原理基础上,指出其存在的缺陷,并建立了一个旨在优化搜索引擎功能的分布协作式网络搜索引擎模型。 相似文献
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【目的/意义】对Google、Bing、百度和搜狗四个中外文搜索引擎的自然语言问答能力进行评价,以揭示搜 索引擎正在向兼具搜索和自动问答功能的系统演进的趋势,对不同搜索引擎在不同类型问题上的自然语言回答能 力进行比较。【方法/过程】从文本检索会议和自然语言处理与中文计算会议的问答系统评测项目抽取了三类问题 （人物类、时间类、地点类）,并进行搜索,以搜索引擎是否返回准确答案或包含正确答案的精选摘要为标准进行人 工评分,使用单因素方差分析和多重比较检验的方法进行比较分析。【结果/结论】主流的中外文搜索引擎均已具备 一定的自然语言问答能力,但仍存在较大的提升空间。Google总体表现最好,但对于人物类问题的回答能力弱于 搜狗。中外文搜索引擎在时间类问题上的表现均好于人物类和地点类问题。 相似文献
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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. 相似文献