神经网络在视频检索中的应用

随着计算机技术的发展,视频数据的容量以几何级数增长。如何在海量视频数据库中快速地检索到所需视频成为热门的研究课题。本文提出了一种基于反馈式神经网络的视频检索算法,对视频进行基于内容的分析和检索。实验表明用该方法检索的准确度比用基于关键帧的视频检索方法平均提高4%以上。     

基于知识密集型的CBR构件检索方法研究与实现

传统的构件检索方法假定用户的查询需求是清晰且准确的,然而用户往往并不能准确地定义自己的查询需求。本文提出了一种基于知识密集型会话式案例推理的构件检索方法,并重点阐述如何以主动的“询问一应答”方式通过基于知识密集型会话式案例推理方法帮助用户构造增量式查询。实验结果表明：该方法是行之有效的,能够大幅度提高构件的检索效率。     

基于CCLA的信息管理专业实践教学模式研究

针对实践教学中传统的说教模式和空洞的讨论形式存在的不足,提出了一种基于CCLA的全新实践教学模式．比较了该模式与传统实践教学、手工沙盘的区别,最后根据近三年信息管理专业毕业生的学生知识接受度和实习实践质量测评成绩对比分析了这三种实践教学模式,从而验证了该种教学模式的科学性。     

典型实验教学视频案例制作的教学设计——以“乙酰水杨酸的制备”为例

典型实验教学视频案例为提高高校实验教学效果,促进实验教学改革起到重要推动作用。针对实验教学视频案例的制作,文章从教学设计的视角,以个案研究的方法,对典型实验教学视频案例的概念特点以及如何应用教学设计做了详细介绍。     

探析Hulu运营模式对卫视网站创新的借鉴

网络视频是一个受年轻用户青睐的新媒体新兴业务,但多数网络视频因其由用户自传而出现版权诉讼、内容删除、质量差和内容品位不高等问题,使一些视频网站看上去很热闹,赢利却很困难。本文通过对新兴视频网站Hulu的模式进分析,认为Hulu模式符合视频网站未来的发展趋势,值得各类视频网站借鉴。     

Gender theory as a tool for analyzing science teaching

This study examines to what extent experienced teachers are aware of gender issues in the science classroom. It also explores how an introduction to gender theory might alter this awareness. Teachers wrote their reflections about a real classroom situation. They were then asked to analyse the same situation after having read texts that discussed gender theory concepts. The fourteen teachers' understanding about gender and society were challenged. Some teachers were able to analyse the case differently by applying gender theory, others discussed the case on a more general level, while one teacher showed signs of resistance regarding gender theory.     

How to capture growth? – Video narratives as an instrument for assessment in teacher education

Portfolios are widely used as instruments for assessment in initial teacher education courses. They are claimed to present a comprehensive picture of student teachers' knowledge and performance. But what type of evidence is needed to safely say that an aspiring teacher has not only grasped essential notions and concepts from the teacher education course, but is also able to implement them in real world classroom situations? This paper reports on the design process of one portfolio assignment that has been developed specifically to capture students' classroom performance and development in their portfolio. Data from the portfolio entries of one student from a small-scale pilot conducted with the assignment are analyzed in detail followed by a discussion of the implications of the case study.     

Qualitative Differences Between Learning Environments Using Videos in Small Groups and Whole Class Discussions: A Preliminary Study in Physics

Interactivity, group learning and student engagement are accepted as key features of social constructivist learning theories. The challenge is to understand the interplay between such features in different learning environments. This study focused on the qualitative differences between two interventions—small-groups and whole-class discussions. In both interventions, three short video slices on the abstract topic ‘the physics of superconductivity’ were interspersed with the different discussion styles. The video slices are based on the Bruner stages. Twenty-nine first year university physics students completed a pre-test, underwent the intervention and completed a post-test. The remainder of the data were collected from student drawings, video recordings, observer notes and facilitator feedback. Results indicate that the use of the video slices in both interventions were successful in changing students’ understandings of superconductivity. However, the small groups treatment tended to facilitate questioning, meaning-making and subsequent changes of ideas more so than the whole class discussions. Implications for research and practice are discussed.     

对侦查讯问同步录音录像制度的反思

讯问同步录音录像制度对于遏制刑讯逼供、保护犯罪嫌疑人等都具有重要作用。任何制度的建立和运作都有赖于一系列相关制度作保障,我国在相关保障机制尚未建立健全的情况下就推行这一制度,不仅可能无法发挥该制度预期的作用,反而会造成相反的结果。解决问题的关键在于加强对侦查讯问过程的外部监督和制约,使得该制度得以真正发挥作用。     

网络教学视频素材应用研究

文章针对高校多媒体教学发展过程中主要瓶颈之一——教学视频素材的应用问题,以网络视频素材的应用过程为线索,从视频素材的来源、下载、格式转换、加工以及合理设计等多个方面入手,探索了一整套适合教学视频素材应用的方案和方法,为视频素材的应用及提高课堂教学效率提供了一种较好的模式。