移动互联网背景下消费者搜索在线信息行为的实证分析     

孙杰  罗京 《现代情报》2017,37(1):89

在线信息已经成为消费者了解产品的主要信息来源。以移动互联网为背景,将在线信息分为卖方主导信息、买方主导信息和第三方主导信息3类,研究不同类型在线信息对消费者感知的影响,构建了消费者搜索在线信息过程模型。研究表明,卖方主导信息能够最大程度上满足消费者的消费信息需求,买方主导信息被消费者用以判断卖方主导信息的风险性,而第三方主导信息则对买卖双方主导信息提供辅助判断作用。  相似文献   

基于DialUnit的DIALOG检索新策略     

陆建平 《情报学报》1999,18(4):296-302

本文主要探讨世界上最大的联机情报检索系统 Ｄ Ｉ Ａ Ｌ Ｏ Ｇ 的 Ｄｉａｌ Ｕｎｉｔ 收费新政策及其检索新策略。首先介绍了 Ｄｉａｌ Ｕｎｉｔ 收费政策,包括 Ｄｉａｌ Ｕｎｉｔ 是什么、如何计算其数量及费用。然后,针对这一收费新政策,提出了一系列检索新策略,包括注意事项、与系统的连接、数据库的选用、检索式的编制及输出选项等,旨在降低联机检索的费用,提高检索的效益。  相似文献   

新版ESP@CENET网上检索新增主要功能及其运用     

柳彦淑 《情报科学》2005,23(8):1205-1208

欧洲专利局网站从1998年创建开始,历经了7年多的时间,对esp@cenet网上检索进行了数次更新,使检索方法更为便捷,检索界面更加人性化,为用户提供的信息更全面、更准确。特别是在老版数据的基础上,增加了免费的专利法律状态显示功能和集专利文献中所有图形于同一界面显示的浏览功能。本文描述了这几方面新增添的功能,并就一些检索结果与STN商业数据库系统进行了比较。  相似文献   

On the role of human and machine metadata in relevance judgment tasks     

《Information processing & management》2023,60(2):103177

In order to evaluate the effectiveness of Information Retrieval (IR) systems it is key to collect relevance judgments from human assessors. Crowdsourcing has successfully been used as a method to scale-up the collection of manual relevance judgments, and previous research has investigated the impact of different judgment task design elements (e.g., highlighting query keywords in the document) on judgment quality and efficiency. In this work we investigate the positive and negative impacts of presenting crowd human assessors with more than just the topic and the document to be judged. We deploy different variants of crowdsourced relevance judgment tasks following a between-subjects design in which we present different types of metadata to the human assessor. Specifically, we investigate the effect of human metadata (e.g., what other human assessors think of the current document, as in which relevance level has already been selected by the majority crowd workers), machine metadata (e.g., how IR systems scored this document such as its average position in ranked lists, statistics about the document such as term frequencies). We look at the impact of metadata on judgment quality (i.e., the level of agreement with trained assessors) and cost (i.e., the time it takes for workers to complete the judgments) as well as at how metadata quality positively or negatively impact the collected judgments.  相似文献   

The NICE OECD countries' geographic search filters: Part 2—validation of the MEDLINE and Embase (Ovid) filters     

Lynda Ayiku  Thomas Hudson  Ceri Williams  Paul Levay  Catherine Jacob 《Journal of the Medical Library Association》2021,109(4):583

Objective:We previously developed draft MEDLINE and Embase (Ovid) geographic search filters for Organisation for Economic Co-operation and Development (OECD) countries to assess their feasibility for finding evidence about the countries. Here, we describe the validation of these search filters.Methods:We identified OECD country references from thirty National Institute for Health and Care Excellence (NICE) guidelines to generate gold standard sets for MEDLINE (n=2,065) and Embase (n=2,023). We validated the filters by calculating their recall against these sets. We then applied the filters to existing search strategies for three OECD-focused NICE guideline reviews (NG103 on flu vaccination, NG140 on abortion care, and NG146 on workplace health) to calculate the filters'' impact on the number needed to read (NNR) of the searches.Results:The filters both achieved 99.95% recall against the gold standard sets. Both filters achieved 100% recall for the three NICE guideline reviews. The MEDLINE filter reduced NNR from 256 to 232 for the NG103 review, from 38 to 27 for the NG140 review, and from 631 to 591 for the NG146 review. The Embase filter reduced NNR from 373 to 341 for the NG103 review, from 101 to 76 for the NG140 review, and from 989 to 925 for the NG146 review.Conclusion:The NICE OECD countries'' search filters are the first validated filters for the countries. They can save time for research topics about OECD countries by finding the majority of evidence about OECD countries while reducing search result volumes in comparison to no filter use.  相似文献   

基于元数据开发Web应用程序     

姚远  朱明东 《人天科学研究》2010,(6):13-14

当需求发生变化,需要对原有系统功能进行修改、扩展时,只要对元数据做好维护,无须修改其他,Web应用程序将自动升级,适应用户需求变化。基于元数据开发Web应用将极大地提高系统的开发、维护效率。对系统的结构及实现进行了论述。该应用程序增强了需求的适应能力,提高了系统的灵活性和可扩展性。  相似文献   

开创情报语言学的新天地——论张琪玉教授对情报语言学的新贡献   总被引：3，自引：0，他引：3  

曹树金  罗春荣  汪东波 《中国图书馆学报》1999,25(5)

张琪玉教授在自然语言检索和情报检索语言研究方面成就卓著 ;对情报检索语言的未来发展有独到见解。参考文献 2 6  相似文献