共查询到20条相似文献，搜索用时 171 毫秒
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网格技术与分布式数字图书馆 总被引：1，自引：0，他引：1
简要介绍了数字图书馆的基本要素、特征和网格系统的结构及网格技术最新发展;提出了基于网格的分布式存储技术、检索技术、智能化服务在分布式数字图书馆的应用结构模式;通过利用网格技术解决数字图书馆的跨库检索问题说明了网格在数字图书馆中的具体应用。 相似文献
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网格环境下的数字图书馆检索模型研究 总被引：4，自引：0，他引：4
网格为数字图书馆建立跨越Web的信息分布和集成应用提供了新平台。通过比较传统数字图书馆和基于网格的数字图书馆在检索模型上的区别，剖析了服务资源检索的实现机制，包括服务资源检索的语义问题。 相似文献
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XML Web Services在数字图书馆系统中的应用 总被引：2，自引：1，他引：1
本文介绍了如何采用XML Web Services技术构建一个分布式数字图书馆应用系统。首先描述了系统的体系结构,然后介绍由ASP.NET创建XML Web Services的工作原理,最后以一简单实例阐述了XML Web Services技术在数字图书馆系统中的实现方法。 相似文献
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数字化图书馆实质上就是信息的数字化、传输的网络化、服务功能的多元化。数字图书馆建设目标就是将传统的文献知识信息数字化，建立交互式的数字信息系统和查询检索手段。概括地说，数字图书馆是一个分布式的大型知识库，即以分布式海量数据库群为支撑，基于智能检索技术的大型开放式分布知识库群。民族地区高校由于其特殊的地域环境，决定了她肩负着为少数民族地区的经济繁荣、 相似文献
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本文介绍如何利用数字图书馆服务注册系统开发分布式数字图书馆服务.介绍了数字图书馆服务注册系统建设的现状、数字图书馆服务注册系统的基本构成及建设分布式数字图书馆参考模式的必备条件.作者认为通过构建数字图书馆服务注册系统的参考模式,数字图书馆会不断向前发展,这样,也可以使数字图书馆从简单的信息存储转向更多的合作收藏的分布式服务.本文为数字图书馆的开发者和数字图书馆的服务者提供一种思路,尤其是对那些正在寻求更多的合作和协作的数字图书馆会大有帮助. 相似文献
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何淑娟 《内蒙古科技与经济》2009,(6):131-133
文章对ILASIII进行了简要介绍,指出其是一个完整的数字图书馆解决方案和服务系统,并从人机交互的角度,评估了ILAS与普通图书馆管理员以及系统维护人员之间的交互,并对其Web－PAC检索功能进行了分析评价。 相似文献
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金华猪心精氨酸加压素的免疫组化研究 总被引：3，自引：0，他引：3
用免疫组织化学（ＡＢＣ）法观察金华猪心精氨酸加压素（ＡＶＰ）免疫反应（ＩＲ）阳性的神经纤维和细胞的分布,结果发现ＡＶＰ－ＩＲ纤维分布于左右心房、心室、冠状窦和冠状动脉周围,但以心房为多,右心房近冠状窦外见散在分布的阳性神经细胞,ＩＲ纤维呈线状,占线状或交织成网络状,主要分布在心肌层及外膜下肌层,多伴血管走行,或攀附血管走行,这一发现提示金华猪心有与人心相似的神经肽,这为研究金华猪心的神经肽在心血管系统中的作用提供了形态学基础。 相似文献
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This paper reports findings from an exploratory study investigating working notes created during encoding and external storage (EES) processes, by human search intermediates using a Boolean information retrieval (IR) system. EES processes have been an important area of research in educational contexts where students create and use notes to facilitate learning. In the context of interactive IR, encoding can be conceptualized as the process of creating working notes to help in the understanding and translating a user's information problem into a search strategy suitable for use with an IR system. External storage is the process of using working notes to facilitate interaction with IR systems. Analysis of 221 sets of working notes created by human search intermediaries revealed extensive use of EES processes and the creation of working notes of textual, numerical and graphical entities. Nearly 70% of recorded working notes were textual/numerical entities, nearly 30% were graphical entities and 0.73% were indiscernible. Segmentation devices were also used in 48% of the working notes. The creation of working notes during EES processes was a fundamental element within the mediated, interactive IR process. Implications for the design of IR interfaces to support users' EES processes and further research is discussed. 相似文献
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Charles Cole 《Information processing & management》1998,34(6):709-720
The research examines the notion that the principles underlying the procedure used by doctors to diagnose a patient's disease are useful in the design of “intelligent” IR systems because the task of the doctor is conceptually similar to the computer (or human) intermediary's task in “intelligent information retrieval”: to draw out, through interaction with the IR system, the user's query/information need. The research is reported in two parts. In Part II, an information retrieval tool is described which is based on “intelligent information retrieval” assumptions about the information user. In Part I, presented here, the theoretical framework for the tool is set out. This framework is borrowed from the diagnostic procedure currently used in medicine, called “differential diagnosis”. Because of the severe consequences that attend misdiagnosis, the operating principle in differential diagnosis is (1) to expand the uncertainty in the diagnosis situation so that all possible hypotheses and evidence are considered, then (2) to contract the uncertainty in a step by step fashion (from an examination of the patient's symptoms, through the patient's history and a physical (signs), to laboratory tests). The IR theories of Taylor, Kuhlthau and Belkin are used to demonstrate that these medical diagnosis procedures are already present in IR and that it is a viable model with which to design “intelligent” IR tools and systems. 相似文献
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摘要：为了解决大规模分布式管理信息系统中的高速信息共享等问题,提出了基于对等结构的管理信息系统平台。给出了该系统平台的节点模型、管理策略及信息共享流程;提出了一种结合分布式哈希表和聚类的高速检索方法,保证了用户能够在分布式管理系统中快速的精确检索和分类检索;实现了系统的用户透明;为了保证分布式管理信息系统中的分布式多副本同步,提出了“对等锁”作为数据一致性维护方法。同时,给出了平台的具体实现方法,并给出了实例;实验结果表明,该平台具有良好的信息共享性能、高效的搜索能力和相当的容错能力。 相似文献
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《Information processing & management》1987,23(3):195-210
This paper reviews some aspects of the relationship between the large and growing fields of machine learning (ML) and information retrieval (IR). Learning programs are described along several dimensions. One dimension refers to the degree of dependence of an ML + IR program on users, thesauri, or documents. This paper emphasizes the role of the thesaurus in ML + IR work. ML + IR programs are also classified in a dimension that extends from knowledge-sparse learning at one end to knowledge-rich learning at the other. Knowledge-sparse learning depends largely on user yes-no feedback or on word frequencies across documents to guide adjustments in the IR system. Knowledge-rich learning depends on more complex sources of feedback, such as the structure within a document or thesaurus, to direct changes in the knowledge bases on which an intelligent IR system depends. New advances in computer hardware make the knowledge-sparse learning programs that depend on word occurrences in documents more practical. Advances in artificial intelligence bode well for knowledge-rich learning. 相似文献
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《Information processing & management》2001,37(1):163-182
This article is Part IV in a series of articles that report the results of a two year research program the purpose of which is to design and test intelligent information retrieval (IR) devices for undergraduates researching a social science term paper. The devices are task-facilitating, helping the undergraduate perform the task of researching and writing a term paper, and they provide a mold which takes the students’ amorphous conception of their information need, turning it into an effective query to the IR system. The present article reports the results of two studies which tested an uncertainty expansion IR device and an uncertainty reduction IR device in naturalistic settings. The devices are designed to be given at different stages of Kuhlthau’s information search process (ISP). In both studies, undergraduates were randomly assigned to either the test group, who received the device intervention, or a comparison group. In Study 1, we found that the comparison group received a higher mean mark than students in the uncertainty expansion group. In Study 2, we found that the uncertainty reduction group received a higher mean mark than the comparison group when the device was given later in the student’s ISP. We conclude that the timing of the device interventions is crucial to their potential efficacy. 相似文献
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Evaluation research on information retrieval (IR) systems has thus far been narrowly focused and disjointed. This research attempts to narrow the gap by providing a comprehensive and integrated multiple criteria decision-theoretic approach for the evaluation of IR systems. The approach, which is based on the Analytic Hierarchy Process (AHP), is illustrated in the context of a domain-specific IR system. The novelty of this approach lies in the focus on the user aspect and the application of decision-making theories in the IR field. 相似文献
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In this paper results from three studies examining 1295 relevance judgments by 36 information retrieval (IR) system end-users is reported. Both the region of the relevance judgments, from non-relevant to highly relevant, and the motivations or levels for the relevance judgments are examined. Three major findings are studied. First, the frequency distributions of relevance judgments by IR system end-users tend to take on a bi-modal shape with peaks at the extremes (non-relevant/relevant) with a flatter middle range. Second, the different type of scale (interval or ordinal) used in each study did not alter the shape of the relevance frequency distributions. And third, on an interval scale, the median point of relevance judgment distributions correlates with the point where relevant and partially relevant items begin to be retrieved. The median point of a distribution of relevance judgments may provide a measure of user/IR system interaction to supplement precision/recall measures. The implications of investigation for relevance theory and IR systems evaluation are discussed. 相似文献