视频监控系统实训室的升级设计

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。     

Orthographic analogies and early reading: Explorations of performance and variation in two transfer tasks

Two experiments investigated the use of orthographic analogies in 6 year olds. In Experiment 1, 26 children were shown CVC clue and target word pairs sharing either rimes (`fork' – `pork'), heads (`fork' – `ford') or were controls (`fork' – `hurl'). A modest advantage for rime-clued over head-cluedtargets was unreliable over by-subject and by-item analyses. Improvements in target word reading were correlated with pretest scaffolding errors (e.g. `pork' misread as `park'). In Experiment 2, 50 children were pretaught three clue words for each target word before being shown words that shared either rimes (`leak' – `peak'), or medial vowel digraphs (`leak') – `bean'), or were controls (`leak' – `herd'). A modest advantage for rime-clued over vowel digraph-clued targets was again unreliable over by-subject and by-item analyses. Neither rime nor phoneme awareness measures were correlated with rime inference use. Vowel, but not rime inference, was correlated with scaffolding errors. Rime detection was the strongest predictor of reading ability, whereas phoneme segmentation was the strongest predictor of the use of scaffolding errors.     

Maintaining teachers’ face in the context of change: results from a study of Vietnamese college lecturers’ perceptions of face

Gaining and saving face are very important in Vietnam as a mechanism of social control, including the professional behaviour of teachers. Interviews with 15 lecturers (aged 24–37) at a teacher training college in a Central Coast province of Vietnam illustrated the relationship between their concepts of face and their beliefs about good teaching. Most were still strongly influenced by traditional Confucian beliefs about the role and position of teachers, the nature of teachers’ knowledge and the relationship between teachers and students. On the other hand, some teachers also were aware of, and to a limited extent open to, more modern ideas that seemed to be related to broad social changes and reforms in approaches to teaching and learning in recent decades in Vietnam. The findings suggest that some teacher educators are uncertain about the value of traditional professional wisdom in the context of critical changes in society and in education. The research also suggests that the concepts of face and saving face are important for teachers’ sense of agency, and that Vietnamese educational authorities could increase the effectiveness of innovations in teacher education by paying attention to the influence of concepts of face on the teachers’ beliefs and behaviours.     

论基于问题学习的教师观--兼论我国新课程实施中教师角色的变化

基于问题的学习不仅引起了教学观、学习观的深刻变革 ,也引起了教师观的革命性转变 ,并且这种转变也是与我国新课程改革中所倡导的教学观、学习观、教师观一脉相承的。它倡导的教师角色行为包括营造学习共同体、创设问题情境、激活已有知识、发挥支架作用、引导问题后的反思 ,提出的合格教师的能力涉及学科能力和学习指导技能。     

基于AT89C51单片机的苯类检测仪的设计

基于AT89C51单片机的苯类检测仪由AT89C51单片机、苯类传感器、12位A／D转换器TLC2543组成,以液晶屏显示苯类含量．软件系统包括初始化程序、数据采集程序和显示程序三部分．     

一种认知无线电自适应双门限能量检测算法

针对传统频谱感知方法易受噪声波动影响的缺点,提出了一种认知无线电自适应双门限能量检测算法.该算法基于双门限能量检测,通过比较认知用户接收的能量值和预定义的门限值,判断当前信道状态并自适应地选择一轮感知或两轮感知.推导了所提算法的检测概率、虚检概率和感知时间的性能表达式,并采用蒙特卡洛仿真得到信噪比与检测概率、感知时间的...     

基于视频的城市快速路交通流检测及车辆行为监控

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...     

年幼儿童的视频学习:研究与展望

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。     

基于激光光斑检测的数码相机测距技术

提出了一种基于激光光斑检测的数码相机测距方法,在数码相机上加装一个激光器,使激光光束与相机镜头的光轴平行,对拍摄到的数码相片中的激光光斑进行检测,再根据透镜成像的物像关系实现距离的测量.研究了利用LoG滤波器对激光光斑进行增强的方法,实现了背景灰度值大于光斑灰度值情况下的光斑分割,从而实现激光光斑的位置检测.并进行了实验研究,实验结果表明,采用本文提出的方法实现对物体距离的测量是可行的.     

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

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.