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。     

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。     

越溪河春季底栖动物的群落结构及水质评价

2009年4月中、下旬对岷江支流越溪河底栖动物群落结构进行了调查,并应用生物指数对河水水质进行了综合评估.结果表明：越溪河春季共采集到底栖动物46种,其中节肢动物22种,软体动物19种,环节动物4种,扁形动物1种.不同微生境底栖动物种类组成、平均生物量和各类群平均密度差异较大,体现了植被较丰富、工业相对不发达而水电开发较早的丘陵地区河流底栖无脊椎动物群落结构的典型特征.生物指数评价结果显示小井沟河段水质清洁,符合饮用水标准.     

Video Enhanced Reflective Practice (VERP): supporting the development of trainee educational psychologists’ consultation and peer supervision skills

This article aims to seek trainee educational psychologists’ (TEPs) views about their experiences of using Video Enhanced Reflective Practice (VERP) to support their professional development, with a particular focus on consultation and peer supervision skills for the VERP guider. Participants engaged in three cycles of VERP, reflecting upon their practice using video clips of themselves. An action research design was implemented and views from trainee EPs and the Video Interaction Guidance (VIG) supervisor were sought, using semi-structured interviews. Hybrid Thematic Analysis was used in order to analyse the data. Findings suggest that VERP was generally a positive experience for trainees and their experiences highlighted the impact of observing themselves in practice, as opposed to retrospective reflection. Trainee EPs selected factors to consider within a ‘shared review’ and reflected on their experiences of being filmed, the strengths and the challenges of which are considered.     

Affordances of video-based professional development for supporting physics teachers' judgments about evidence of student thinking

This study explores the affordances of a video-based professional development workshop for supporting physics teachers' content-specific judgments about evidence of student thinking. We rated both the quality of teachers' discussions and the judgments that resulted as they discussed video clips highlighting student thinking. We found that teachers' judgments were related to the quality of their discussions. Quantitative and qualitative analyses suggest that elaborated focus questions and interactions with colleagues may support teachers with relatively little physics teaching experience in using their collective wisdom to engage in a situation-specific skill necessary for responsive teaching.     

Biology instruction using a generic framework of scientific reasoning and argumentation

We investigated biology instruction—using a generic framework of scientific reasoning and argumentation (SRA) with eight epistemic activities—on how to foster student learning in biological literacy which had not been clarified in previous studies. Our analysis of videotaped biology lessons and student achievement showed varying frequencies in using these activities and their effects on achievement. Those students taught with more epistemic activities had higher achievement. We believe that the SRA framework can be a worthwhile methodical tool for teaching biology to foster student learning. Therefore, we draw practically orientated implications for educational research, practitioners, teacher educators, and curriculum developers.     

Use of probabilistic and deterministic measures to identify unfavorable earthquake records

This study introduces measures to identify resonant （concentration of energy in a single or a few frequencies） or unfavorable earthquake ground motions. Probabilistic measures based on the entropy rate and the geometric properties of the power spectral density function （PSDF） of the ground acceleration are developed first. Subsequently, deterministic measures for the frequency content of the ground acceleration are also developed. These measures are then used for identifying resonance and criticality in stochastic earthquake models and 110 acceleration records measured at rock, stiff, medium and soft soil sites. The unfavorable earthquake record for a given structure is defined as the record having a narrow frequency content and dominant frequency close to the structure fundamental natural frequency. Accordingly, the measures developed in this study may provide a basis for selecting records that are capable of producing the highest structural response. Numerical verifications are provided on damage caused to structures by identified resonant records.