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Decisions in thesaurus construction and use 总被引：1，自引：0，他引：1
A thesaurus and an ontology provide a set of structured terms, phrases, and metadata, often in a hierarchical arrangement, that may be used to index, search, and mine documents. We describe the decisions that should be made when including a term, deciding whether a term should be subdivided into its subclasses, or determining which of more than one set of possible subclasses should be used. Based on retrospective measurements or estimates of future performance when using thesaurus terms in document ordering, decisions are made so as to maximize performance. These decisions may be used in the automatic construction of a thesaurus. The evaluation of an existing thesaurus is described, consistent with the decision criteria developed here. These kinds of user-focused decision-theoretic techniques may be applied to other hierarchical applications, such as faceted classification systems used in information architecture or the use of hierarchical terms in “breadcrumb navigation”. 相似文献
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动画精灵是一种具有人性化的界面元素,它给我们的操作带来方便。在这篇文章中,我们介绍在Authorware中使用动画精灵的准备工作,并结合一 个实例介绍了在Authorware中使用动画精灵的过程。 相似文献
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变量是一个完善的开发工具必备的功能。Authorware为用户提供了完善的变量系统,几乎有关程序的任何一个属性、操作都可以在Authorware中找出来。在这篇文章中,给出了变量的定义,并以实例的形式讲述了变量的使用方法。 相似文献
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三角代换在求函数最值中是一种常用的重要方法.其实质是把求函数最值的问题利用三角函数知识进行合理替换,使之转化成三角函数问题便捷求解的等价转化的数学思想方法.具体做法是将所给函数中的自变量用某个三角函数进行代换,并对代换后的式子适当变形,从而达到解题目的.本文旨在介绍进行三角代换求函数最值时,如何选择代替函数变量的三角函数,以及代换后如何根据原函数限定所选三角函数中角的范围,并通过典型实例介绍它的应用. 相似文献
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《Journal of The Franklin Institute》1880,109(6):411-413
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分析了主体知识在应对不确定环境方面的作用,指出主体知识对其决策的作用不仅局限于传统分析所述的辅助,还具有替代理性计算决策的功能。依赖主体知识进行的规则支配决策与依赖消耗资源进行理性计算决策,是主体权衡偏差成本与决策成本的理性结果。在节约偏差成本的目标指引下,主体知识的最优特征受到环境事件概率分布的影响。存在一个环境事件概率分布的临界值,可用以分割主体决策的两种模式,确定依赖主体知识进行规则支配决策的适用领域。 相似文献
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Clio Presvelou 《The Information Society》2013,29(4):245-264
Abstract In 1985 the Department of Household Sciences conducted research on Dutch households that use information technologies for domestic purposes. This research was part of a six‐nation research programme and was supported by the FAST‐II research activities of the EEC, and the Agricultural University of Wageningen. The use of three types of information technology was surveyed: home computer, Videotext, and Teletext. Analysis of the finding indicates the types of households likely to benefit from information technology in the future and groups households into three classes according to their attitudes to information technology—productivistic, hobbyist, and socially committed. 相似文献
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In this paper technological forecasting techniques, their limitations, and problems of application are briefly out-lined. The interdependent of planning and forecasting is revealed and the distinction between “normative” and “exploratory” forecasting is critically discussed. The following types of forecasting techniques are dealt with: extrapolation techniques, analogies, simulation models, and expert surveys. 相似文献