Effect of binocular disparity on learning anatomy with stereoscopic augmented reality visualization: A double center randomized controlled trial     

Katerina Bogomolova  Marc A. T. M. Vorstenbosch  Inssaf El Messaoudi  Micha Holla  Steven E. R. Hovius  Jos A. van der Hage  Beerend P. Hierck 《Anatomical sciences education》2023,16(1):87-98

Binocular disparity provides one of the important depth cues within stereoscopic three-dimensional (3D) visualization technology. However, there is limited research on its effect on learning within a 3D augmented reality (AR) environment. This study evaluated the effect of binocular disparity on the acquisition of anatomical knowledge and perceived cognitive load in relation to visual-spatial abilities. In a double-center randomized controlled trial, first-year (bio)medical undergraduates studied lower extremity anatomy in an interactive 3D AR environment either with a stereoscopic 3D view (n = 32) or monoscopic 3D view (n = 34). Visual-spatial abilities were tested with a mental rotation test. Anatomical knowledge was assessed by a validated 30-item written test and 30-item specimen test. Cognitive load was measured by the NASA-TLX questionnaire. Students in the stereoscopic 3D and monoscopic 3D groups performed equally well in terms of percentage correct answers (written test: 47.9 ± 15.8 vs. 49.1 ± 18.3; P = 0.635; specimen test: 43.0 ± 17.9 vs. 46.3 ± 15.1; P = 0.429), and perceived cognitive load scores (6.2 ± 1.0 vs. 6.2 ± 1.3; P = 0.992). Regardless of intervention, visual-spatial abilities were positively associated with the specimen test scores (η² = 0.13, P = 0.003), perceived representativeness of the anatomy test questions (P = 0.010) and subjective improvement in anatomy knowledge (P < 0.001). In conclusion, binocular disparity does not improve learning anatomy. Motion parallax should be considered as another important depth cue that contributes to depth perception during learning in a stereoscopic 3D AR environment.  相似文献   

Instructional practices in secondary science: How teachers achieve local and standards-based success     

Beth A. Covitt  Elizabeth Xeng de los Santos  Qinyun Lin  Christie Morrison Thomas  Charles W. Anderson 《科学教学研究杂志》2024,61(1):170-202

This article reports on analyses of the instructional practices of six middle- and high-school science teachers in the United States who participated in a research-practice partnership that aims to support reform science education goals at scale. All six teachers were well qualified, experienced, and locally successful—respected by students, parents, colleagues, and administrators—but they differed in their success in supporting students' three-dimensional learning. Our goal is to understand how the teachers' instructional practices contributed to their similarities in achieving local success and to differences in enabling students' learning, and to consider the implications of these findings for research-practice partnerships. Data sources included classroom videos supplemented by interviews with teachers and focus students and examples of student work. We also compared students' learning gains by teacher using pre–post assessments that elicited three-dimensional performances. Analyses of classroom videos showed how all six teachers achieved local success—they led effectively managed classrooms, covered the curriculum by teaching almost all unit activities, and assessed students' work in fair and efficient ways. There were important differences, however, in how teachers engaged students in science practices. Teachers in classrooms where students achieved lower learning gains followed a pattern of practice we describe as activity-based teaching, in which students completed investigations and hands-on activities with few opportunities for sensemaking discussions or three-dimensional science performances. Teachers whose students achieved higher learning gains combined the social stability characteristic of local classroom success with more demanding instructional practices associated with scientific sensemaking and cognitive apprenticeship. We conclude with a discussion of implications for research-practice partnerships, highlighting how partnerships need to support all teachers in achieving both local and standards-based success.  相似文献   

基于Voronoi的微粒群优化的三维无线传感网络节点定位算法的研究     

虞芬  陈静 《科技通报》2014,(11)

无线传感中的节点定位一直以来都是研究的热门,为了更好的解决三维无线传感空间中节点定位不准确的问题,本文在粒子群算法基础上引入Voronoi模型,将三维空间中的节点的定位问题归纳为目标函数的最优解,证明了Voronoi模型的赋权值边存在敏感点的定理,通过定理的应用获得了目标函数的最优解,有效解决了节点定位问题。仿真实验表明,本文的算法优于对比算法具有更好的健壮性,提高了定位精度。  相似文献   

医学期刊微信视频号应用现状及发展策略探究     

刘洋  李娜  邓履翔  董哲  李玉乐  赵娜  吴一波 《中国科技期刊研究》2022,33(7):877-10

【目的】 了解我国医学期刊微信视频号运营现状,探究现存问题并提出建议,为更多医学期刊发展微信视频号提供思路。【方法】 采用网络搜索法对《中文核心期刊要目总览(2020版)》收录的医药、卫生类期刊名称进行检索,获取期刊开通微信视频号的情况、信息资料、运营情况等相关数据进行统计整理、分析,总结问题并提出有效发展策略。【结果】 医学期刊微信视频号存在开通率低、信息资料不完善、运营意识不强、推送规划不够、平台活跃度不高、渠道引流不足等问题。【结论】 医学期刊在微信视频号领域具有较大发展空间,建议充分发挥新型视频媒介优势及自身学科优势,积极投身微信视频号,重视平台建设,提高运营意识,构建推送体系,并注重用户互动性及多渠道引流,提升微信视频号的传播能力。  相似文献   

“多元化立体发展”的珠宝人才培养模式的建设与成效     

刘殿正 《科教文汇》2014,(15):113-114

本文主要探讨了“多个发展方向、多种培养方式、多个发展通道”的多元化立体发展的珠宝人才培养模式的建设,并论述了这一模式的成效。  相似文献   

计算机辅助船舶设计系统研究     

苏琳芳  左鹰 《科教文汇》2014,(16):108-108,116

简要介绍计算机辅助船舶设计技术在国内外的发展,着重研究TRIBON、NUPAS-CADMATIC等常用系统。  相似文献   

《雨霖铃》教学案例     

张洪静 《科教文汇》2014,(17):142-142,156

本文结合教材和学生的特点制订了《雨霖铃》的教学目标和教学步骤,在鉴赏环节的设计上充分发挥学生的自主合作能力,实现了教师引导、学生为主体的教学理念,学生也获得了鉴赏诗词的经验。教师课后进行了反思,总结了这堂课的优点和不足之处,并提出了改进的方法。  相似文献   

经阴道超声(二维联合三维)检查对宫腔占位性病变的诊断价值     

赵卫东  成平  伍业冬 《大众科技》2016,(5):88-89

目的:探讨经阴道超声(二维联合三维)检查对宫腔占位性病变的诊断价值。方法:收集2014年1月~2014年8月在广西中医药大学第一附属医院经阴道超声(二维联合三维)检查、诊断并经手术病理证实的82例宫腔占位病变资料进行回顾性分析。结果:实验组82例,经阴道超声检查结果为:子宫内膜息肉54例,子宫粘膜下肌瘤13例,子宫内膜癌2例,子宫内膜增生过长2例,所有病例都经病理证实,诊断符合率为90.1%。结论:以上四种常见宫腔占位病变经阴道超声检查,其声像图可作为对其诊断和鉴别诊断的重要依据。  相似文献   

我国电视体育频道的设置格局与运营状况研究     

郝英 《体育与科学》2011,32(1):79-82

运用文献资料、逻辑分析等方法,对我国电视体育频道的设置格局与运营状况进行了研究。研究结果:我国体育频道通常依据各电视台所在的行政区域垂直分布,行政归属分属于各电视台,目前我国境内尚没有广电系统以外的民间或社会力量拥有的体育频道。与我国区域经济发展的格局相呼应,体育频道在全国分布并不平衡,有影响力的强势体育频道多分布在经济发达、人口众多、电视媒体实力雄厚的省、市和地区。大部分体育频道播出内容以体育节目为主,但也包括其他非体育节目类型,直播赛事的比例也普遍低于国外著名体育频道,说明我国体育频道播出专业化水平还有待提高。中央台五套在电视体育节目收视市场显示了强大的竞争实力,我国体育频道发展还处于央视"一枝独秀"的格局,体育频道"百花齐放"的竞争格局还远未形成。  相似文献   

集装箱装箱辅助决策系统     

王朝霞 《上海海事大学学报》2011,32(4):43-48

为提高集装箱空间利用率,根据集装箱装箱作业的实际操作要求,开发提供辅助性决策的集装箱装箱系统软件.该软件由参数设置、环境设置、计划制订、装载计算等4个模块组成,充分考虑集装箱装箱过程中的复杂约束,采用启发式算法对模型进行求解.对2个实例的分析表明,由该软件提出的装箱方案可以为工作人员提供辅助性决策,提高集装箱空间的利用...  相似文献