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本文以2006-2008三年的年度业绩预告作为公司未来盈利预测信息的研究样本,对股权分置改革后上市公司未来盈利预测信息的有用性进行实证分析。研究表明,上市公司未来盈利预测信息具有明显的短期披露效应：公告类型与股票价格的变动方向和大小有着符号上的一致性和统计上的显著性。公告前的股价反应表明,市场存在以利好消息进行内幕交易的可能性。与以前研究结论所不同的是,长期事件窗口的结果显示盈利预测信息的披露效应存在一定的局限性。 相似文献
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《Information processing & management》2022,59(5):103007
Re-using research resources is essential for advancing knowledge and developing repeatable, empirically solid experiments in scientific fields, including interactive information retrieval (IIR). Despite recent efforts on standardizing research re-use and documentation, how to quantitatively measure the reusability of IIR resources still remains an open challenge. Inspired by the reusability evaluations on Cranfield experiments, our work proactively explores the problem of measuring IIR test collection reusability and makes threefold contributions: (1) constructing a novel usefulness-oriented framework with specific analytical methods for evaluating the reusability of IIR test collections consisting of query sets, document/page sets, and sets of task-document usefulness (tuse); (2) explaining the potential impacts of varying IIR-specific factors (e.g. search tasks, sessions, user characteristics) on test collection reusability; (3) proposing actionable methods for building reusable test collections in IIR and thereby amortizing the true cost of user-oriented evaluations. The Cranfield-inspired reusability assessment framework serves as an initial step towards accurately evaluating the reusability of IIR research resources and measuring the reproducibility of IIR evaluation results. It also demonstrates an innovative approach to integrating the insights from individual heterogeneous user studies with the evaluation techniques developed in standardized ad hoc retrieval experiments, which will facilitate the maturation of IIR fields and eventually benefits both sides of research. 相似文献
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决定顾客作出购买决定的主要不是商品的质量而是对商品的需要,即商品的实用性。推销员在商品推销中必须强调商品的实用价值,不要过多地罗列质量特点,并且要用顾客听得懂的语言陈述质量要点。 相似文献
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创造力存在两个特性,有用性与新颖性。探究两种特性的内涵与区分,对于创新管理实践有着重要意义。参考扎根理论方法,采用深度访谈的方法,提炼出创造力的具体表现,从创新过程和结果的角度描述了创造力的有用性与新颖性两种维度的区分特性,进而探索影响员工对两种特性追求的因素,以此构建了基于有用性和新颖性区分的创造力影响因素理论模型。 相似文献
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面向信息检索的术语服务构建与应用研究 总被引：1，自引：0，他引：1
在信息检索中,叙词表作为一种辅助有效检索的工具变得日益重要。术语注册与术语服务是在网络环境下对叙词表进行维护和应用的一种理想方式,能够极大促进叙词表在信息检索中的应用。本文的研究重点是面向信息检索的术语服务构建与应用。首先,以《汉语主题词表》为来源词表,采用语义网技术和REST架构构建术语服务。其次,以“获取同义词”服务为例,对术语服务在图书馆OPAC系统和百度搜索引擎中的有用性进行测评,结果表明,采用这一服务使OPAC系统的F值提高13%,使百度搜索引擎的P@5查准率提高16%。最后,设计了四种术语服务在信息检索系统中的应用方式,即复选扩检式、单选替换式、混合式和自动扩检式,并采用用户测评法对这四种应用方式进行可用性测评,结果表明,复选扩检式是可用性最佳的术语服务应用方式。图13。表9。参考文献34。 相似文献
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Kevin Williams 《Educational Philosophy and Theory》2020,52(5):535-548
AbstractThis paper applies Oakeshott’s distinction between work and play to his philosophy of language education. The first part explores his critique of the vocational rationale for learning foreign languages and his affirmation of the intrinsic value or playful character of the activity. The second part of the article endeavours to give practical content to Oakeshott’s vision of studying language for the pleasure of the activity by drawing on sources that reflect the character of the experience in terms of playfulness. 相似文献
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Search systems are limited by their inability to distinguish between information that is on topic and information that is useful, i.e. suitable and applicable to the tasks at hand. This paper presents the results of two studies that examine a possible approach to identifying more useful documents through the relationships between searchers’ tasks and the document genres in the collection. A questionnaire and an experimental user study conducted in two domains, provide evidence that perceptions of usefulness are dependent upon information task type, document genre, and the relationship between these two factors. Expertise is also found to have an effect on usefulness. These results further our understanding of the role of task and genre interactive information retrieval. 相似文献