Tracking Pre-service Teachers’ Changing Conceptions of Good Science Teaching: The Role of Progressive Reflection with the Same Video     

Benny Hin Wai Yung  Siu Ling Wong  Man Wai Cheng  Ching Sum Hui  Derek Hodson 《Research in Science Education》2007,37(3):239-259

A CD-ROM consisting of videos of two lessons by different teachers demonstrating exemplary science teaching was used to elicit, develop and track the changing conceptions of good science teaching of student teachers enrolled for the one-year Postgraduate Diploma in Education (PGDE) at several stages during the programme. It was found that the videos acted as an effective probe to elicit student teachers’ conceptions and had significant impact on those conceptions at different stages of the programme through the provision of teacher models demonstrating exemplary teaching. The experience has extended novice teachers’ awareness of alternative teaching methods and approaches not experienced in their own schooling, broadened their awareness of different classroom situations, provided proof of existence of good practices and prompted them to reflect on their current conceptions of good science teaching. Most importantly, the strategy of asking student teachers to watch the same videos on three separate occasions at different times of the course was recognized by them as a crucial element in facilitating their reflection on their changing conceptions of good science teaching. PGDE is the standard form of pre-service teacher education in Hong Kong. It provides qualified teacher status within Hong Kong. Student teachers enrolled for the PGDE have completed a relevant undergraduate degree.  相似文献   

一种在MPEG-4编码过程中提高实时性的算法     

鞠鸣  何鸿 《广东广播电视大学学报》2007,16(2):33-37

本文提出了一种新的在MPEG-4编码过程中提高实时性的算法。算法采用双重筛选机制,充分利用了运动估计的结果提取运动对象。首先在运动估计过程中加入背景优先准则进行第一重筛选;然后根据运动估计后宏块的最小平均绝对差值分利用区域自适应门限进行第二重筛选,从而获得运动区域掩模;最后对掩模进行形态滤波和填充消除噪声点,最终得到运动区域。算法分别在硬件和软件平台上进行测试,结果表明提出的算法得到了理想的分割效果,较传统的在编码前进行运动对象提取的方法实时性大大提高了。  相似文献   

基于Action Script的校园可视化信息导航系统     

王玉姝 《湖州职业技术学院学报》2007,5(3):91-94

在信息的表达中应用图片的直观性来快速表达信息,使用者能在短时间内接受更多的信息.通过采用Action Scrip语言设计一个校园可视化信息导航系统,通过采用不同种Action Scrip语言来实现系统的交互作用,实践证明该种导航系统能使使用者快速便捷地找到所需信息,效果良好.  相似文献   

The interplay of representations and patterns of classroom discourse in science teaching sequences     

Kok-Sing Tang 《International Journal of Science Education》2016,38(13):2069-2095

The purpose of this study is to examines the relationship between the communicative approach of classroom talk and the modes of representations used by science teachers. Based on video data from two physics classrooms in Singapore, a recurring pattern in the relationship was observed as the teaching sequence of a lesson unfolded. It was found that as the mode of representation shifted from enactive (action based) to iconic (image based) to symbolic (language based), there was a concurrent and coordinated shift in the classroom communicative approach from interactive–dialogic to interactive–authoritative to non-interactive–authoritative. Specifically, the shift from enactive to iconic to symbolic representations occurred mainly within the interactive–dialogic approach while the shift towards the interactive–authoritative and non-interactive–authoritative approaches occurred when symbolic modes of representation were used. This concurrent and coordinated shift has implications on how we conceive the use of representations in conjunction with the co-occurring classroom discourse, both theoretically and pedagogically.  相似文献   

孔李煤矿信息系统传输质量的改善     

倪靖  杨畅 《淮南职业技术学院学报》2006,6(3):42-44

孔李煤矿由于历史原因,信息网络传输系统存在着诸多不足,已不能满足信息技术发展和矿区信息化建设的需要;从适应矿区信息化建设发展及未来信息技术发展要求出发,从通信、计算机网络、视频会议、监控四个方面,分析了孔李信息系统网络传输现状及存在的问题,针对问题运用先进的通信传输设备和技术,通过分步实施、优化配置,使信息网络系统传输质量得到明显改善,取得显著成效。  相似文献   

视频监控系统实训室的升级设计     

汪海燕 《教育教学论坛》2019,(26):263-264

在原有的实训室的基础上,引入当前主流的网络视频监控技术与智能化技术,结合行业需求,设计相关视频监控系统,满足课程实训对视频监控系统的要求,同时具有一定的品牌兼容性,能模拟复杂条件下的不同品牌监控设备的集成,紧跟安防行业应用现状,让学生能全面掌握当前视频监控设备安装调试技能,提升学生核心职业技能,为行业培养优秀的具有安装与调试的高素质技能型人才。  相似文献   

基于视频的城市快速路交通流检测及车辆行为监控     

蔡英凤  王海  张为公 《东南大学学报》2011,(2):164-168

提出一种针对城市快速路的视频监控系统,完成交通流及道路异常行为检测.流量检测模块对车辆进行实时跟踪获得各类交通流统计数据,实现快速路车辆运行状况的全面掌控.异常监控模块运用隐马尔科夫模型,对带有时间和空间信息的车辆轨迹进行训练,获得路径划分后对道路车辆轨迹进行参数匹配,提取诸如超低(高)速行驶、违章停车、违规掉头等异常...  相似文献   

年幼儿童的视频学习:研究与展望     

郭力平  朱文佳  郝俊  张苏颖 《幼儿教育》2011,(12)

视频资源已成为当代儿童生活中不可或缺的组成部分。研究表明,尽管年幼儿童通过视频进行了学习,但在年幼儿童,尤其是3岁前儿童的认知发展过程中,视频学习的作用可能并不明显。因此,理解年幼儿童视频学习的视角应当从对认知发展的关注转换到对社会性发展的关注上来,在年幼儿童社会化的过程中理解视频学习,揭示视频学习的社会性本质。视频资源不应是单纯的知识载体,而应当成为儿童的社会伙伴。考察视频环境中年幼儿童的学习,应在儿童、他人和视频构成的互动系统中,关注人际互动与人机互动的动态协调。强调视频学习的社会性本质,可以为年幼儿童学习理论的建设带来新思路,也可以为视频资源的教育应用及相关政策的制定提供依据,为视频节目的设计与制作带来新的启示。  相似文献   

基于录像分析背景下的代数课堂教学语言研究——以两堂《分式的乘除》课堂实录为例     

叶立军  斯海霞 《数学教育学报》2011,(1):42-44

量化分析《分式的乘除》两堂录像课,参考弗兰德提出的"Flanders互动分析系统"师生语言分类,将代数课堂教学语言进行分类,并就不同教学环节,对教学语言比较分析,得出以下结论:(1)课堂教学中,教师的教学语言所用时间占有很高的比例,各种类型的教学语言的时间比例不同,以提问性语言为主;(2)代数课堂教学中两位教师在各个教学环节中教学语言所占时间比例不同,例题讲解、练习讲解环节教师语言所占的比例最大;(3)代数课堂教学各个环节中,教师大多采用提问性为主的教学语言;(4)课堂教学中,应适当减少命令性语言和提问性语言,适当增加启发性语言、反馈性语言和激励性语言,以提高教学效果.  相似文献   

Video diaries: a tool to investigate sustainability-related learning in threshold spaces     

Jane Roberts 《Environmental Education Research》2011,17(5):675-688

This paper takes as a case study an undergraduate field class from a UK university to rural Uganda. It describes and evaluates the use of video diaries as a tool for investigating the process of transformative learning in the context of education for sustainability. The applicability of threshold concept theory to this learning is investigated. Results show the video diary technique to be much more successful in capturing the development of student learning than written diaries. Despite some practical difficulties, rich data were generated. Analysis demonstrated that learning met three of the five criteria for threshold concepts: the learning was transformative, integrative and troublesome. Further research could test whether the learning in this case study met the threshold concept criterion of irreversibility. Further elaboration of the theoretical relationship between threshold concepts, transformative learning and education for sustainability is also needed. It is concluded that the video diary method is potentially transferable to other educational research contexts and may be particularly suitable for researching learning in threshold spaces.  相似文献