几种搜索引擎中Image搜索的比较

随着用户对网上图像搜索要求的不断增长，各种基于Web的图像搜索引擎应运而生。但是各种不同的图像搜索引擎在搜索的响应时间、检索出的图像的数量、准确性、检索结果的排序等方面存在着较大的差异。本文首先就图像搜索模式作一简单的叙述，然后对搜索引擎Google、Excite、Yahoo、Ixqiuck的Image Search进行比较。     

基于搜索引擎的数字图书馆智能信息检索

智能信息检索的实质和发展方向，是智能搜索引擎技术的不断改进和广泛应用。以智能搜索引擎为中心构建数字图书馆的个性化服务系统，是数字图书馆信息检索的现实需要和大势所趋。文章论述了当前搜索引擎存在的不足及智能搜索引擎的优越性，概述了智能信息检索及其主要解决方案，探讨了智能搜索引擎在数字图书馆个性化服务中的应用。     

The effect of CD-ROM MEDLINE on online end-user and mediated searching: a follow-up study

Indiana University School of Medicine Library (IUSML) has traditionally been a high volume searching institution. The dramatic effect of CD-ROM on online end-user searching and the negligible effect on mediated searching was reported in an earlier study. This follow-up study reveals that the proportion of mediated searching has been drastically reduced from 94% in 1986/87 to 39% as of November 1989. Mediated searches are declining in absolute numbers as well. End-user searching, by contrast, has increased by 54% percent over the previous year. A related trend is the increased use of CD-ROM by the librarian as an alternative to mediated online searching. These trends are expected to continue as IUSML expands its CD-ROM operation to include other databases. As mediated searching declines, the librarian's role will increasingly include end-user training.     

CD-ROM与联机检索的关系

CD- ROM 与联机检索是当前两种最主要的计算机情报检索方式。两种检索方式各具特点与不足, 它们相互作用, 在竞争中共存, 在共存中互为补充, 从而提高了当今计算机情报检索的整体效应。     

基于公共与非公共检索计算机的OPAC检索行为比较研究

[目的/意义] 探讨用户在公共检索和非公共检索计算机上进行OPAC检索的行为共性与差异。[方法/过程] 以北京师范大学图书馆OPAC日志数据为例,对图书馆内公共检索计算机和馆外典型非公共检索计算机产生的日志信息进行分析,从基本特征、一次检索会话内的检索行为特征两方面,对两类计算机用户的OPAC检索行为进行比较。[结果/结论] 公共检索计算机用户与非公共检索计算机用户在关键检索行为的表现上具有高度的一致性,包括检索点与高级检索功能的使用、一次检索会话内的提问调整方式等。同时,两类用户在一次检索会话的提问次数、持续时间、两次检索会话时间间隔等方面表现出差异。     

The role of expert searching in the Family Physicians' Inquiries Network (FPIN).

OBJECTIVE: This article describes the contributions of medical librarians, as members of the Family Physicians' Inquiries Network (FPIN), to the creation of a database of clinical questions and answers that allows family physicians to practice evidence-based medicine using high-quality information at the point of care. The medical librarians have contributed their evidence-based search expertise and knowledge of information systems that support the processes and output of the consortium. METHODS: Since its inception, librarians have been included as valued members of the FPIN community. FPIN recognizes the search expertise of librarians, and each FPIN librarian must meet qualifications demonstrating appropriate experience and training in evidence-based medicine. The consortium works collaboratively to produce the Clinical Inquiries series published in family medicine publications. RESULTS: Over 170 Clinical Inquiries have appeared in Journal of Family Practice (JFP) and American Family Physician (AFP). Surveys have shown that this series has become the most widely read part of the JFP Website. As a result, FPIN has formalized specific librarian roles that have helped build the organizational infrastructure. CONCLUSIONS: All of the activities of the consortium are highly collaborative, and the librarian community reflects that. The FPIN librarians are valuable and equal contributors to the process of creating, updating, and maintaining high-quality clinical information for practicing primary care physicians. Of particular value is the skill of expert searching that the librarians bring to FPIN's products.     

美国两大法律数据库检索技术与功能比较分析

Lexis.com和Westlaw International是美国两个著名的法律数据库,其文献收录覆盖范围广、文献类型多样、检索技术复杂,从内容到功能上十分类似。对两者收录内容、检索方式、检索技术、检索功能等进行比较和分析,可使用户对其结构和检索技巧有更深刻的了解,方便学习者和研究者有效利用这两大法律数据库。     

美国两大法律数据库检索技术与功能比较分析

Lexis.com和Westlaw International是美国两个著名的法律数据库,其文献收录覆盖范围广、文献类型多样、检索技术复杂,从内容到功能上十分类似。对两者收录内容、检索方式、检索技术、检索功能等进行比较和分析,可使用户对其结构和检索技巧有更深刻的了解,方便学习者和研究者有效利用这两大法律数据库。     

基于认知风格的Web目录检索界面实证分析

提出基于认知风格模型的检索界面设计原则,以搜索引擎Google作为实验对象,基于认知风格理论,从界面整体风格、主目录和子目录排列方式、命中网站的排序方式、检索结果的表示方式及相关目录显示5个方面分析Google检索界面并提出相应的优化策略。     

中美韩三国八大搜索引擎多媒体检索比较分析

文章采用网络调查及文献调研法,从图片检索、音乐检索和视频检索三方面对中国的百度、Sogou和Soso,韩国的Naver、Nate和Daum,美国的Google和Yahoo!八大搜索引擎提供的多媒体检索服务进行分析与测评。调查结果显示,Yahoo!不提供音乐检索,其余调查对象都提供图片检索、视频检索和音乐检索三项服务。大多数搜索引擎公司的图片检索和视频检索都支持高级检索功能,Daum导入了语义检索,Google和Yahoo!引入了安全检索服务过滤有害信息。     

The effect of CD-ROM MEDLINE on online end user and mediated searching.

Since 1970, Indiana University School of Medicine Library (IUSML) has traditionally been a high volume online searching institution. The library recently implemented an end user searching program which includes MEDLINE on CD-ROM. The effect of CD-ROM on online end user and mediated searching is discussed. Comparative statistics are provided by category of search service. CD-ROM has had a dramatic lowering effect on online end user searching and has had little effect on mediated searching. IUSML's experience with CD-ROM technology has been a positive one. Trained end users have become IUSML's greatest asset.     

State of the art of expert searching: results of a Medical Library Association survey.

OBJECTIVES: Medical Library Association (MLA) members were surveyed to gather background about the current state of expert searching in institutions. The survey results were intended to guide the recommendations of the Task Force on Expert Searching for promoting the importance of expert searching and implementing those recommendations. METHODS: MLA members were surveyed, and data obtained from the survey were compiled and analyzed to answer three general questions: what is the perceived value of searching skills to the institution, how do health sciences librarians maintain and improve their searching skills, and how are searching services promoted and/or mandated in the institution. RESULTS: There were 256 responses to the survey. Over 95% of the respondents saw their expert-searching skills were of value to their institutions, primarily through performing mediated searches and search consultations. Over 83% of the respondents believed that their searching skills had improved over the past 10 years. Most indicated that continued training was very important in maintaining and improving their skills. Respondents promoted searching services most frequently through orientations, brochures, and the libraries' Web pages. No respondent's institution mandated expert searching. Less than 2% of respondents' institutions had best practice guidelines related to expert searching, and only about 8% had guidelines or policies that identified situations where expert searching was recommended. CONCLUSIONS: The survey supports the belief that health sciences librarians still play a valuable role in searching, particularly in answering questions about treatment options and in providing education. It also highlights the need for more expert searching courses. There has been minimal discussion about the perceived need for expert-searching guidelines in the institutions represented by survey respondents.     

网络信息检索工具的比较分析

通过对 Alta Vista、Excite、Hot Bot、Infoseek四种检索型网络检索工具的异同比较 ,详细分析了它们的基础检索与高级检索功能、各种检索选择、检索技巧及特殊检索功能等     

基于动态隧道算法的网络爬行器设计与实现*

在分析传统网络爬行器爬行算法的基础上,通过将隧道算法和网页页面分块技术相结合,指导专题爬行器进行爬行。通过4所高校门户网站的教育资源搜索实验表明,新的算法可以有效提高搜索效率。     

The quality and impact of MEDLINE searches performed by end users

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