共查询到20条相似文献，搜索用时 125 毫秒
1.
2.
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
3.
4.
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
5.
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
6.
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
7.
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
8.
基于颜色/形状直方图的图像检索方法 总被引：1，自引：0，他引：1
Content-based retrieval technology is widely used in multimedia databases.Some image databases use the color of image as the main retrieving content feature.Shape feature is also used to query image, such as moment variant,rotating angle, etc. In this article, a new approach is presented to retrieve image using the color and shape histogram in-formation. The color/shape-based retrieval technology has the advantages of accelerating the retrieving speed and resisting the image noise. 相似文献
9.
Tingfeng Cao Liang Chen Dixiang Zhang Tianxiang Sun Zhengfu He Xipeng Qiu Xing Xu Hai Zhang 《国家科学评论(英文版)》2023,(6):16-19
<正>PROBLEM Recent years have witnessed the rapid progress of self-supervised language models (LMs)[1],especially large language models (LLMs)[2].LLMs not only achieved state-of-the-art performance on many natural language processing tasks,but also captured widespread attention from the public due to their great potential in a variety of real-world applications (e.g.chatbots,search engines,writing assistants,etc.)through providing general-purpose intelligent services.A few of the LLMs are b... 相似文献
10.
In the 1970s the development of high-resolution electron microscopy (HREM) provided a new approach to structure determination for minute crystals, which is thoroughly different from the diffraction methods.However, the previous method of trial and error has its own limits, such as some preliminary structural information must be known in advance; the crystals must be sufficient strong under the electron beam irradiation;and not all atoms can be seen in the image. Two ideas were proposed to initiate the present research project:one is to transform an arbitrary image into the crystal structure map, and the other is to enhance the image resolution by combining the information contained in the image and the corresponding electron diffraction pattern. These ideas have been realized via the combination of electron microscopy and diffraction crystallography. 相似文献
11.
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. 相似文献
12.
基于Web的图像搜索引擎 总被引：1，自引：0，他引：1
随着互联网的快速普及，宽带网的全力推行，网络上的图像信息急剧膨胀，多媒体文件越来越多，与此同时，用户对网上图像搜索的要求也在不断增长，在这种背景下，传统的文本搜索方式已经不能满足用的特殊需要，如何能更方便快捷地从网络上找到需要的图像或多媒体文件？于是，各种基于Web的图像搜索引擎应运而生。它们各自以不同的工作方式，使我们对网上图像信息的搜索变得非常简单，本文将从图像搜索引擎的工作原理，搜索方法以及国内外各大图像搜索引擎三个方面作一介绍。 相似文献
13.
《Information processing & management》2001,37(2):295-311
A growing body of research is beginning to explore the information-seeking behavior of Web users. The vast majority of these studies have concentrated on the area of textual information retrieval (IR). Little research has examined how people search for non-textual information on the Internet, and few large-scale studies has investigated visual information-seeking behavior with general-purpose Web search engines. This study examined visual information needs as expressed in users’ Web image queries. The data set examined consisted of 1,025,908 sequential queries from 211,058 users of Excite, a major Internet search service. Twenty-eight terms were used to identify queries for both still and moving images, resulting in a subset of 33,149 image queries by 9855 users. We provide data on: (1) image queries – the number of queries and the number of search terms per user, (2) image search sessions – the number of queries per user, modifications made to subsequent queries in a session, and (3) image terms – their rank/frequency distribution and the most highly used search terms. On average, there were 3.36 image queries per user containing an average of 3.74 terms per query. Image queries contained a large number of unique terms. The most frequently occurring image related terms appeared less than 10% of the time, with most terms occurring only once. We contrast this to earlier work by P.G.B. Enser, Journal of Documentation 51 (2) (1995) 126–170, who examined written queries for pictorial information in a non-digital environment. Implications for the development of models for visual information retrieval, and for the design of Web search engines are discussed. 相似文献
14.
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
15.
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
16.
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
17.
国内医学搜索引擎的现状及发展对策 总被引：1，自引：0，他引：1
通用搜索引擎没有对医学专业信息进行优化处理，不适合检索专业化的医学信息。因此，为了适应用户需要，加强对医学专业搜索引擎的研究是十分必要的。本文指出了国内医学搜索引擎存在的问题，提出了中文医学搜索引擎改变现状、快速发展的几点对策。 相似文献
18.
19.
Comparing rankings of search results on the Web 总被引：1，自引：0，他引：1
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. 相似文献
20.