共查询到20条相似文献，搜索用时 414 毫秒
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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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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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多约束条件下检索组合模型的应用 总被引：2，自引：0，他引：2
With an analysis of the main document databases, this paper discusses the combined retrieval models used under the multi-restrictive conditions by use of the conditional probability theory. The paper provides system programmers with combined probability theory and its application examples. It's useful for users to increase recall ratio, pertinency ratio and search rate. 相似文献
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The Catcher in the Rye expounds the theme that growing is a depressing thing.Holden is an alienated adolescence and in search for an identity but get frustrated and anguished. 相似文献
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医学文献光盘数据库主题标引规律的探讨 总被引：3，自引：0，他引：3
In order to search information more effectively, this essay compares CBMdisc and MEDLINE for their similarities and differences in subject indexing. It also puts forward some suggestions about subject indexing of Chinese medical literatures. 相似文献
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网络数据库用户界面的使用便利性研究 总被引：1，自引：0，他引：1
Based on a comparative study of Cambridge Scientific Abstracts' Internet Database Service and OCLC's FirstSearch, this paper discusses the user-friendly interfaces of Web-based databases according to their characteristics such as database selection, search strategy formulation and reformulation, online help and result output. 相似文献
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检索语言在文献检索教学中的定位 总被引：2，自引：0，他引：2
Focused on the use of retrieval language in document retrieval teaching, this article discusses the influence of retrieval language on retrieval tool, retrieval mode and retrieval efficiency. It suggests that a retrieval language system be constructed and points out its proportion to document retrieval teaching. 相似文献
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《中国科学院院刊(英文版)》2008,22(3):142-142
In daily life, we move our eyes frequently to search for or fixate a target of interest with the retinalfovea. Usually, the eyes would dart from one position to another in the visual field at velocities higher than 500 degrees per second. This rapid eye movement is called a saccade. 相似文献
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[目的/意义]查询式搜索适用于目标明确的提问应答式信息问题，探索式搜索更注重搜索过程的人机交互性、动态性与多面性，两者表现出不同的行为特征。作为搜索行为研究的基本问题之一，相关研究还比较缺乏。论文旨在探究查询式搜索与探索式搜索行为特征的差异，这对于信息搜索系统的功能优化以及指导用户高效获取信息都具有重要的实践意义。[方法/过程]论文以健康信息搜索为例，采用搜索行为实验的方法，通过对录屏数据的分析，从检索策略、学习行为、深度搜索和搜索绩效4个维度对两种搜索行为进行比较。[结果/结论]查询式搜索与探索式搜索在关键词变换数、访问网页数目等6个指标上存在显著性差异，在检索工具选择、查询串长度、搜索结果集的翻页和相关链接搜索4个指标上不存在显著性差异。 相似文献
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Recent research in the human computer interaction and information retrieval areas has revealed that search response latency exhibits a clear impact on the user behavior in web search. Such impact is reflected both in users’ subjective perception of the usability of a search engine and in their interaction with the search engine in terms of the number of search results they engage with. However, a similar impact analysis has been missing so far in the context of sponsored search. Since the predominant business model for commercial search engines is advertising via sponsored search results (i.e., search advertisements), understanding how response latency influences the user interaction with the advertisements displayed on the search engine result pages is crucial to increase the revenue of a commercial search engine. To this end, we conduct a large-scale analysis using query logs obtained from a commercial web search. We analyze the short-term and long-term impact of search response latency on the querying and clicking behaviors of users using desktop and mobile devices to access the search engine, as well as the corresponding impact on the revenue of the search engine. This analysis demonstrates the importance of serving sponsored search results with low latency and provides insight into the ad serving policy of commercial search engines to ensure long-term user engagement and search revenue. 相似文献
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网上搜索引擎的几个理论问题 总被引：23，自引：1，他引：22
本文概述了搜索引擎及其作用,搜索引擎的类型、搜索引擎的信息检索模型、建立搜索引擎的关键技术、搜索引擎的评价标准等理论问题并分析了目前搜索引擎的局限性． 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
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Google为用户提供了多种检索功能,但这些检索功能的性能如何却少见于相关文献中。作者对Google的两种较为独特的检索功能进行了评析,分别是相似检索和链接检索,并以普通检索作为评价的标准。本文采用了20个检索式和20个目标网页,对相似检索、链接检索和普通检索的检索性能差异性进行了评价。研究中主要利用单因素方差分析法和回归分析法。研究结果显示普通检索表现最好。研究成果能帮助用户对相似检索和链接检索有较为清晰的认识,并且可以了解Google在这两种检索功能上所表现出的不同的检索性能。 相似文献
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搜索引擎检索结果的网页组织技术及其优化策略 总被引：2，自引：0，他引：2
本文分析了搜索引擎检索结果的组织技术及其存在的不足，并对检索结果的组织技术进行了优化处理，最后分析了搜索引擎检索结果中提高网页排名的优化策略。 相似文献
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The study investigated how users’ emotion control and search tasks interact and influence the Web search behavior and performance among experienced Web users. Sixty-seven undergraduate students with substantial Web experience participated in the study. Effects of emotion control and tasks were found significant on the search behavior but not on the search performance. The interaction effect between emotion control and tasks on the search behavior was also significant: effects of users’ emotion control on the search behavior varied depending on search tasks. Profile analyses of search behaviors identified and contrasted the most commonly occurring profiles of search activities in different search tasks. Suggestions were made to improve information literacy programs, and implications for future research were discussed. 相似文献