Investigation of learners' perceptions for video summarization and recommendation     

Jie Chi Yang 《Interactive Learning Environments》2013,21(4):369-385

Recently, multimedia-based learning is widespread in educational settings. A number of studies investigate how to develop effective techniques to manage a huge volume of video sources, such as summarization and recommendation. However, few studies examine how these techniques affect learners' perceptions in multimedia learning systems. This article aims to examine learners' perceptions for summarization and recommendation, with an emphasis on the perspective of prior experience. In this study, we developed a multimedia content summarization and recommendation system, which can automatically extract summaries from raw video sources and recommend suitable video content to learners through emails. The results demonstrate that learners' prior experience and preferences for the presentation of document types affect their perceptions, including the enhancement of interests, the ease of information acquisition and the intention for the further use of the system. Finally, the findings are applied to develop a framework that can support for the design of multimedia learning systems.  相似文献   

层层巧设 收获实效——浅论有效课堂的教学策略     

苏丽珊 《科教文汇》2013,(12):148-149

优质、有效的课堂教学是促进学生有效学习的基本前提条件,是素质教育的重要保障。实现课堂教学的有效性,已成为当前课程改革的重要方向。本文主要从激趣引思铺垫进而有效导入新课;自主合作探究进而有效讲授新知;归纳整理回味进而有效课堂小结;巩固延伸拓展进而有效布置作业几方面层层精巧安排,结合小学语文课堂教学,探讨提高课堂教学有效性的几点策略。  相似文献   

课虽尽而意无穷——浅谈初中英语阅读课的结尾方式     

戴小斐 《科教文汇》2013,(14):115-115,117

本文论述了在新课标的要求下,初中英语阅读课的课堂教学结尾方式。结合课堂教学实例,浅谈了适合不同英语阅读课的多种英语教学结尾方式,如概括式、延伸式和辩论式。根据不同的教学目标和要求,运用不同的适合课堂的结尾方式,以达到优化英语阅读教学,提高教学效率的作用。  相似文献   

高校心理学教育的多元化分析     

李必发 《科教文汇》2013,(36):180-181

心理学学科是目前高校普遍开设的专业之一．从社会的整体科学应用知识体系来看,心理学涵盖的范围比较广泛,其在多个领域中进行应用,比如高校教育领域、各个单位的管理领域等。心理学的应用需要进行人类行为的分析,在分析的过程,也是一个心理活动应用的过程。总而言之,心理学具备双重性质,不仅具备理论性而且也具备应用实践性,目前来说,其分为理论心理学及其应用心理学两大模块。在该文中,笔者就亲身经历展开高校心理学教育多元化的探究。  相似文献   

On enhancing the robustness of timeline summarization test collections     

Richard McCreadie  Shahzad Rajput  Ian Soboroff  Craig Macdonald  Iadh Ounis 《Information processing & management》2019,56(5):1815-1836

Timeline generation systems are a class of algorithms that produce a sequence of time-ordered sentences or text snippets extracted in real-time from high-volume streams of digital documents (e.g. news articles), focusing on retaining relevant and informative content for a particular information need (e.g. topic or event). These systems have a range of uses, such as producing concise overviews of events for end-users (human or artificial agents). To advance the field of automatic timeline generation, robust and reproducible evaluation methodologies are needed. To this end, several evaluation metrics and labeling methodologies have recently been developed - focusing on information nugget or cluster-based ground truth representations, respectively. These methodologies rely on human assessors manually mapping timeline items (e.g. sentences) to an explicit representation of what information a ‘good’ summary should contain. However, while these evaluation methodologies produce reusable ground truth labels, prior works have reported cases where such evaluations fail to accurately estimate the performance of new timeline generation systems due to label incompleteness. In this paper, we first quantify the extent to which the timeline summarization test collections fail to generalize to new summarization systems, then we propose, evaluate and analyze new automatic solutions to this issue. In particular, using a depooling methodology over 19 systems and across three high-volume datasets, we quantify the degree of system ranking error caused by excluding those systems when labeling. We show that when considering lower-effectiveness systems, the test collections are robust (the likelihood of systems being miss-ranked is low). However, we show that the risk of systems being mis-ranked increases as the effectiveness of systems held-out from the pool increases. To reduce the risk of mis-ranking systems, we also propose a range of different automatic ground truth label expansion techniques. Our results show that the proposed expansion techniques can be effective at increasing the robustness of the TREC-TS test collections, as they are able to generate large numbers missing matches with high accuracy, markedly reducing the number of mis-rankings by up to 50%.  相似文献   

一种有效的多文档文摘语义空间降维方法     

张先飞  刘嵩  韩永峰  孙显著 《情报学报》2011,28(3)

基于多文档集合特征的多文档文摘生成方法在选取最优词时利用人工进行特征降维,方法过于机械,同时在回溯词鄄文档矩阵进行文本相似度计算时,存在对稀疏矩阵无法计算的问题.本文对话题追踪结果进行多文档文摘研究,提出一种有效的多文档文摘语义空间降维方法.新方法在整个话题范围内构造语义空间词鄄文档矩阵,采用奇异值分解对原始词鄄文档矩阵进行特征降维,同时构造能充分包含原始文档词汇信息且维数低的转换矩阵F,利用它来回溯词鄄文档矩阵,完成低维空间下的词相似度计算,进而完成文本单元相似度计算以及文本单元聚类,最终生成多文档自动文摘.实验结果表明,该方法能够对语义空间词鄄文档矩阵进行完美降维,同时避免稀疏矩阵无法计算的问题,对最终生成的多文档文摘有着很好的效果.  相似文献   

Process Text Guides for Summarizing and Evaluating Empirical Studies     

José A. Montelongo 《College & Undergraduate Libraries》2013,20(3):378-397

ABSTRACT

This article presents a model for creating library information literacy process text guides designed to help students summarize and evaluate quantitative empirical articles. Process text guides contain two strands of strategically embedded activities designed to simulate the processes used by “good readers.” One strand of exercises is included to help students develop the abilities to summarize an empirical research article by having them locate the main ideas of each of the article's paragraphs. A second strand of activities includes more evaluative questions about each of the sections of a research article—abstract, introduction, methodology, results and discussion, and references. Process text guides may be presented throughout a semester or quarter as handouts in library sessions and/or as online information literacy modules. An actual article from a peer-reviewed journal in psychology was used to create a sample process text guide.  相似文献   

备战数学:冲刺中考经验总结     

刘亮 《科教文汇》2015,(5)

本文基于笔者多年从事初中数学教学的经验,从组织课堂、知识复习、心态调整三个方面总结了中考数学备战的一些见解,并在此基础上提出了笔者的反思与今后的做法,力求引领我们的学生走向一个新的起点。  相似文献   

浅谈大学数学教学策略     

谭婕 《科教文汇》2015,(7)

大学数学相较中学数学而言,涉及的内容更广,研究的内容更深。教学的目的就是让学生在掌握理解知识点的基础上学会应用所学内容来解决生活中的实际问题。本文从三个方面探讨了大学数学教学策略：首先,做好与中学数学的衔接,帮助学生能够尽快适应大学教学模式;其次,将数学历史融入数学教学,激发学生的求知欲;最后,总结归纳知识点,提高学生运用数学技巧来解决实际问题的能力。  相似文献   

当前农村精神文明建设探究     

王洋洋 《科教文汇》2015,(17)

农村精神文明建设是社会主义精神文明建设的重要方面。改革开放以来,中国的精神文明建设取得了飞速的发展,积累了大量的经验。不过,农村精神文明的建设还有其自身的困难需要我们探究,面对社会的、经济的发展,农村精神文明建设还不断面临新的课题需要我们攻克。通过对当前农村精神文明建设进行探究,主要积累改革开放以来我们在建设方面的经验,发现农村精神文明建设面临的问题和挑战,并为解决这些问题提供积极借鉴。  相似文献