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跨学科实践性学习中支持性文本的设计与应用
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作者 方凌雁 《教学与管理》 北大核心 2024年第11期22-25,共4页
综合实践活动课程是一门培养学生综合素质的跨学科实践性课程。开发和使用集主题资源、学习程序、学习工具、学习评价于一体的支持性文本有助于支持师生有效的课程行动,体现课程的动态生成性。支持性文本的设计可以从情境式主题、问题... 综合实践活动课程是一门培养学生综合素质的跨学科实践性课程。开发和使用集主题资源、学习程序、学习工具、学习评价于一体的支持性文本有助于支持师生有效的课程行动,体现课程的动态生成性。支持性文本的设计可以从情境式主题、问题解决式学程、多样支持性工具、嵌入式评价四要素入手,使用时要将学生的真实实践、自主探究、综合解决问题作为课程实施的关键要素,使支持性文本成为师生开放的、动态的、生成的课程体验的有效支持。 展开更多
关键词 综合实践活动 跨学科实践性课程 支持性文本
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Accurate performance estimators for information retrieval based on span bound of support vector machines
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作者 于水 叶允明 马范援 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2006年第1期113-117,共5页
Support vector machines have met with significant success in the information retrieval field, especially in handling text classification tasks. Although various performance estimators for SVMs have been proposed, thes... Support vector machines have met with significant success in the information retrieval field, especially in handling text classification tasks. Although various performance estimators for SVMs have been proposed, these only focus on accuracy which is based on the leave-one-out cross validation procedure. Information-retrieval-related performance measures are always neglected in a kernel learning methodology. In this paper, we have proposed a set of information-retrieval-oriented performance estimators for SVMs, which are based on the span bound of the leave-one-out procedure. Experiments have proven that our proposed estimators are both effective and stable. 展开更多
关键词 information retrieval performance estimator span bound support vector machines
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