一个快速有效的凹多边形分解算法   总被引：1，自引：0，他引：1  

孙岩  唐棣 《鞍山师范学院学报》2001,3(1):99-102

提出了一个快速有效的凹多边形分解算法，避免了矢量法所需的大量、复杂的求交计算，因此该算法在时间及计算复杂性方面远远优于矢量法；而且该算法在三维环境中同样适用，这一点使得该算法除了在多边形裁剪中有广泛的应用外，在多面体的消隐中也经常用到．并用VisualC 语言实现．  相似文献   

A NEW ALGORITHM FOR FAST HIDDEN SURFACE REMOVAL OF COMPLEX OBJECTS     

富煜清  黄金法  林峰 《东南大学学报》1994,(2)

ＡＮＥＷＡＬＧＯＲＩＴＨＭＦＯＲＦＡＳＴＨＩＤＤＥＮＳＵＲＦＡＣＥＲＥＭＯＶＡＬＯＦＣＯＭＰＬＥＸＯＢＪＥＣＴＳＦｕＹｕｑｉｎｇ（富煜清）；ＨｕａｎｇＪｉｎｆａ（黄金法）；ＬｉｎＦｅｎｇ（林峰）（ＤｅｐａｒｔｎｉｅｎｔｏｆＲａｄｉｏＥｎｓｉｎｅｅｒｉ...  相似文献   

Linkages between cognitive and social dialogue patterns during collaborative small-group discussions     

《Learning and Instruction》2023

BackgroundCollaborative small-group discussions have the potential to promote reading comprehension, critical thinking, and argumentation. However, few studies have gone beyond cognitive processes to understand the social characteristics of dialogue and their potential contributions to students’ cognitive processing in turn-by-turn dialogic exchanges.AimsThis study closely examined dialogues between speakers and addressees regarding their levels of cognitive processing (i.e., cognitive dialogue patterns) and social processes reflecting social cohesion (i.e., social dialogue patterns). The aims were to understand, first, the relations between students' cognitive dialogue patterns and their social dialogue patterns, and second, the relations between students' cognitive dialogue patterns and peers’ social dialogue patterns.SampleThis study included 4070 speaking turns generated by 120 fifth-graders in 60 small-group discussions.MethodsStudents participated in small-group discussions, called Collaborative Social Reasoning. Dialogue between pairs of group members formed social networks, based on which Exponential Random Graph Models (ERGMs) were specified.ResultsFindings showed that speakers' social dialogue patterns were associated with their cognitive dialogue patterns. However, receiving social dialogue patterns from peers did not always predict students’ advanced types of cognitive dialogue patterns.ConclusionsThis study demonstrated that cognitive and social aspects of small-group discussions are intricately linked, and that encouraging social cohesion does not guarantee that students will engage in collaborative and critical discussions.  相似文献   

Evaluating a technology supported interactive response system during the laboratory section of a histology course          下载免费PDF全文

Vera D. Rinaldi  Nancy A. Lorr  Kimberly Williams 《Anatomical sciences education》2017,10(4):328-338

Monitoring of student learning through systematic formative assessment is important for adjusting pedagogical strategies. However, traditional formative assessments, such as quizzes and written assignments, may not be sufficiently timely for making adjustments to a learning process. Technology supported formative assessment tools assess student knowledge, allow for immediate feedback, facilitate classroom dialogues, and have the potential to modify student learning strategies. As an attempt to integrate technology supported formative assessment in the laboratory section of an upper‐level histology course, the interactive application Learning Catalytics^TM, a cloud‐based assessment system, was used. This study conducted during the 2015 Histology courses at Cornell University concluded that this application is helpful for identifying student misconceptions “on‐the‐go,” engaging otherwise marginalized students, and forming a new communication venue between students and instructors. There was no overall difference between grades from topics that used the application and grades from those that did not, and students reported that it only slightly helped improve their understanding of the topic (3.8 ± 0.99 on a five‐point Likert scale). However, they highly recommended using it (4.2 ± 0.71). The major limitation was regarding the image display and graphical resolution of this application. Even though students embrace the use of technology, 39% reported benefits of having the traditional light microscope available. This cohort of students led instructors to conclude that the newest tools are not always better, but rather can complement traditional instruction methods. Anat Sci Educ 10: 328–338. © 2016 American Association of Anatomists.  相似文献   

图形绘制技术课程综合性实验设计     

过洁  胡炳扬  郭延文 《教育技术导刊》2020,19(2):236-239

针对图形绘制技术课程以往实验设计中存在的覆盖面窄、原理理解困难、程序实现难度大以及学生参与度低的问题,设计了“真实感图形绘制演示系统”综合性课程实验。该实验贯穿于理论教学全过程,能够加深学生对真实感图形绘制中关键理论的直观理解,促进学生对核心技术的掌握并提升学生图形系统开发能力,激发学生对图形绘制技术的学习热情。  相似文献   

浅谈分光光度法标准曲线斜率的控制   总被引：1，自引：1，他引：1  

童晓滨  殷闽华 《宁德师专学报(自然科学版)》2006,18(1):48-50,61

应用尤登双样图对分光光度法进行标准曲线斜率的控制，能简单直观地了解数据质量，看出测点的准确度和精密度，可用同心圆确定测点所代表的标准曲线的斜率是否可接受．  相似文献   

基于二维零件数控加工图形编程系统研究     

刘瑞素  王喜社  冯志明  戴士杰 《河北工业大学成人教育学院学报》2008,23(1):44-47

随着自动编程技术的迅速发展,各种新型数控编程系统不断出现.利用图形编程理论,针对数控线切割机床的加工特点,开发了一种基于二维零件数控加工的TXBCH图形编程系统,重点研究了系统中图素的概念、图素的定义方式和算法,并在此基础上开发出了相应的软件.通过三十多个不同类型零件的图形输入,验证了本文所开发的TXBCH图形编程系统的正确性.解决了中小企业由于费用问题不能购买大型数控编程系统的难题,加快了中小企业的自动化进程.  相似文献   

基于MATLAB的FIR数字低通滤波器分析和设计     

雷学堂  方志雄 《喀什师范学院学报》2007,28(3):37-39

以FIR数字低通滤波器为例,详细分析时域卷积运算和频域加权算法的物理意义.并利用MATLAB的声音处理函数作为数据接口,利用多媒体播放器作为交互界面,利用MATLAB的FDATool作为滤波器设计工具,设计一组语音低通滤波器,通过对比滤波前后的语音效果,可加深对数字信号处理的认识.  相似文献   

数字信号处理在研究生教学中的“分层信息化”教学模式探讨     

徐莹  葛亚坤  厉力华 《教育教学论坛》2019,(31):137-138

文章主要分析了本学院研究生《数字信号处理》课程在教学过程中出现的一些问题,面向研究生教育提出“分层信息化”教育改革模式。同时,文章针对信息化和分层化两个层面对该课程改革内容进行重点探讨,对本专业研究生课《数字信号处理》的教与学进行具体研究和讨论,在实践中不断摸索面向交叉学科背景为主的研究生更有效的多渠道教学途径和方法。  相似文献   

词汇习得研究及对英语词汇教学的借鉴     

余冬梅 《焦作大学学报》2007,21(3):101-102

文章通过附带习得的研究成果,提出了促进附带词汇习得的因素,提出了这些成果对英语词汇教学的启示。  相似文献