共查询到19条相似文献，搜索用时 95 毫秒
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异构数据库的跨库检索技术 总被引：4，自引：0，他引：4
异构数据库的跨库检索是电子资源整合的核心技术,本文分析了目前国内数据库检索的现状,对跨库检索的原理及技术作了介绍,并列举国外一些有影响的跨库检索系统。 相似文献
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Google Scholar和跨库检索系统都是对大量的异构学术资源提供一个统一的检索界面，为用户提供“一站式”服务。本文首先对跨库检索系统及Google Scholar的检索方式及检索性能进行了介绍及分析，其次对二者从检索策略、检索界面、检索速度等方面进行了比较，最后对二者在学术资源检索中的使用进行了分析。 相似文献
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基于元搜索引擎的异构数据检索系统研究 总被引：3，自引：0，他引：3
异构数据库的跨库检索是电子资源整合的核心技术。介绍了异构数据库产生的原因和具体实现方法,提出一种基于元搜索引擎的跨库检索模型;探讨了跨库检索系统的数据整合难点,提出标准问题的至关重要性。 相似文献
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介绍了Deep Web的跨库检索系统Explorit,分析了Explorit系统的特点--检索结果的分面导航、相关度排序、系统部署方式、多语言翻译等等,阐述了跨库检索系统的应用前景. 相似文献
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简单介绍了CNKI数据库在北京科技大学天津学院图书馆的购买、宣传推广情况：采用逐班安排课程、集中讲座、在线培训、专题讲座、检索竞赛等方式开展用户培训,并通过固定人数、网络环境、单库检索和跨库检索方式等进行数据库测评。通过测评发现CNKI稳定性良好、用户对CNKI反映良好、多数用户能够熟练使用CNKI。 相似文献
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跨库检索系统的实施与研究 总被引：1，自引：0，他引：1
本文借鉴元搜索引擎的原理，采用web检索的方式，建立了一个基于java技术的可跨平台的跨库检索系统模型，并就其设计思想、系统结构和实现要点进行了详细介绍。能满足用户对数据库跨库检索和并发检索的需要。通过它能同时检索到多个数据库中的内容。弥补目前大多数搜索引擎达不到的功能。 相似文献
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利用中国学术期刊数据库、万方数据库等检索工具,对高技术服务业的相关研究成果进行了检索、归纳和分析,介绍了研究学者的主要观点,并对研究现状加以述评,对未来可能的研究方向进行展望。 相似文献
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Many powerful methods and tools exist for extracting meaning from scientific publications, their texts, and their citation links. However, existing proposals often neglect a fundamental aspect of learning: that understanding and learning require an active and constructive exploration of a domain. In this paper, we describe a new method and a tool that use data mining and interactivity to turn the typical search and retrieve dialogue, in which the user asks questions and a system gives answers, into a dialogue that also involves sense-making, in which the user has to become active by constructing a bibliography and a domain model of the search term(s). This model starts from an automatically generated and annotated clustering solution that is iteratively modified by users. The tool is part of an integrated authoring system covering all phases from search through reading and sense-making to writing. Two evaluation studies demonstrate the usability of this interactive and constructive approach, and they show that clusters and groups represent identifiable sub-topics. 相似文献
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Web检索工具的构成、分类与用途 总被引：6，自引：0，他引：6
对Web检索工具的构成、索引、检索等特点作了介绍,比较分析和总结了常用Web检索工具的类型、检索范围与用途。讨论了Web检索工具的发展动向。 相似文献
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ENCODE项目科学数据出版模式创新 总被引：1，自引：1，他引：0
【目的】以ENCODE项目为例,探讨数字环境下科学数据的出版模式。【方法】从Nature ENCODE Explorer、Thread(线程)和ENCODE analysis virtual machine三个方面分析 ENCODE项目的出版模式创新方案,并介绍引导工具的呈现效果,展望其后续发展状况。【结果】ENCODE项目基于可视化技术和数据挖掘技术,创造易于使用的可视化工具,对项目成果进行有效整合;引入分析工具帮助用户进行数据集重用和计算。【结论】数字环境下应该重视整合不同出版平台的数据资源加以分析利用,探索实现科学数据开放和共享的有效方法。 相似文献
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《Information processing & management》2002,38(3):401-426
A growing body of studies is developing approaches to evaluating human interaction with Web search engines, including the usability and effectiveness of Web search tools. This study explores a user-centered approach to the evaluation of the Web search engine Inquirus – a Web meta-search tool developed by researchers from the NEC Research Institute. The goal of the study reported in this paper was to develop a user-centered approach to the evaluation including: (1) effectiveness: based on the impact of users' interactions on their information problem and information seeking stage, and (2) usability: including screen layout and system capabilities for users. Twenty-two volunteers searched Inquirus on their own personal information topics. Data analyzed included: (1) user pre- and post-search questionnaires and (2) Inquirus search transaction logs. Key findings include: (1) Inquirus was rated highly by users on various usability measures, (2) all users experienced some level of shift/change in their information problem, information seeking, and personal knowledge due to their Inquirus interaction, (3) different users experienced different levels of change/shift, and (4) the search measure precision did not correlate with other user-based measures. Some users experienced major changes/shifts in various user-based variables, such as information problem or information seeking stage with a search of low precision and vice versa. Implications for the development of user-centered approaches to the evaluation of Web and information retrieval (IR) systems and further research are discussed. 相似文献
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网络环境下的信息检索与数据挖掘技术 总被引：1，自引：0，他引：1
首先对网络环境下信息检索的现状进行分析。主要介绍网络信息检索的代表工具一搜索引擎的工作原理、缺陷夏发展方向,引出数据挖掘技术。并进一步对WEB数据挖掘技术作了概要的介绍,阐明WEB数据挖掘技术是网络信息检索智能化的重要发展方向之一。最后,提出一个结合数据挖掘技术的新的搜索引擎结构模型。 相似文献
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Query suggestion is a common feature of many information search systems. While much research has been conducted about how to generate suggestions, fewer studies have been conducted about how people interact with and use suggestions. The purpose of this paper is to investigate how and when people integrate query suggestions into their searches and the outcome of this usage. The paper further investigates the relationships between search expertise, topic difficulty, and temporal segment of the search and query suggestion usage. A secondary analysis of data was conducted using data collected in a previous controlled laboratory study. In this previous study, 23 undergraduate research participants used an experimental search system with query suggestions to conduct four topic searches. Results showed that participants integrated the suggestions into their searching fairly quickly and that participants with less search expertise used more suggestions and saved more documents. Participants also used more suggestions towards the end of their searches and when searching for more difficult topics. These results show that query suggestion can provide support in situations where people have less search expertise, greater difficulty searching and at specific times during the search. 相似文献