RTOS在数字化焊接电源中的应用前景

定义了嵌入式操作系统，分析了在数字化焊接电源中采用RTOS(Real Time Operating System)的必要性。结合焊接电源的特点，阐述了在数字化焊接电源的开发中引入RTOS的优点，探讨了数字化焊接电源开发中应用RTOS的可行性。分析表明，RTOS在数字化焊接电源中具有广阔的应用前景。     

基于虚拟技术的超声检测培训系统

利用虚拟技术构建虚拟超声检测培训系统VUTS,对其功能、结构和实现方法进行了介绍。在VUTS界面上,鼠标即超声仪按钮和探头,具有强大的交互性和可视化,为直接在计算机上培训超声检测人员提供了手段。     

空气弹簧系统的计算机虚拟设计

随着计算机科学的迅猛发展和工程力学有限元分析理论的不断成熟,空气弹簧的设计和开发由早期主要依靠试验和实际运用中得到的数据来改进转向了计算机虚拟设计与试验相结合的渠道上来.本文运用CAD软件建立了空气弹簧系统的三维立体模型,通过有限元分析,建立了空气弹簧系统的有限元模型,并进行了垂向力学特性分析,其结果与试验结果相一致,为空气弹簧的设计和制造提供了有益的参考.     

基于MATLAB的手臂康复机器人仿真研究

手臂康复机器人通过牵引患肢按规定轨迹运动,以锻炼肌肉、恢复运动功能,实现手臂康复训练.该机器人采用极坐标形式,由电机驱动各关节协调控制实现手臂的平面运动,该机器人可以在水平面和垂直面进行手臂运动锻炼.建立了基于MATLAB的手臂康复机器人控制模型,基于虚拟现实技术进行了仿真,仿真结果说明系统达到了预期效果.     

A Comparison of learning gains when using a 2D simulation tool versus a 3D virtual world: An experiment to find the right representation involving the Marginal Value Theorem

The use of three-dimensional Virtual Worlds in the classroom offers the promise of engaging and authentic learning experiences. Given the effort and investment involved in the creation of these worlds, more studies are needed which measure the learning gains. In particular, greater understanding is needed concerning what aspects of the technology are beneficial for learning what sort of content and in what context. We conducted two experimental studies involving 129 biology students over a two-year period that sought to make a contribution towards this understanding. Our study compared the knowledge of students after a traditional classroom lecture about a biological theorem known as Marginal Value Theorem, with their knowledge after they were exposed to simulations of two-dimensional models developed in NetLogo and three-dimensional models developed in Unity3D. Perhaps due to cognitive overload and distractors in the virtual world, it appears that the two-dimensional NetLogo model delivered better learning outcomes.     

Assessing the effects of gamification in the classroom: A longitudinal study on intrinsic motivation,social comparison,satisfaction, effort,and academic performance

Gamification, the application of game elements to non-game settings, continues to grow in popularity as a method to increase student engagement in the classroom. We tested students across two courses, measuring their motivation, social comparison, effort, satisfaction, learner empowerment, and academic performance at four points during a 16-week semester. One course received a gamified curriculum, featuring a leaderboard and badges, whereas the other course received the same curriculum without the gamified elements. Our results found that students in the gamified course showed less motivation, satisfaction, and empowerment over time than those in the non-gamified class. The effect of course type on students' final exam scores was mediated by students' levels of intrinsic motivation, with students in the gamified course showing less motivation and lower final exam scores than the non-gamified class. This suggests that some care should be taken when applying certain gamification mechanics to educational settings.     

基于三维场景出图的拼接制作2.5维地图算法

针对目前2.5维电子地图的制作与其三维虚拟场景相对独立,且不易更新维护的问题,提出了对三维场景进行图片输出并拼接实现2.5维地图制作的算法。首先设定摄像机长宽值作为最小出图单位,在指定范围内,使用最小出图单位以任意水平角度和俯仰角度输出三维虚拟场景效果图,并记录相关空间信息。然后根据图片左上角点坐标值对所输出图片进行无缝拼接。实验结果表明,该方法在保证地图空间实体表现能力的同时,能够快速替换图中更新区域,提高2.5维地图制作效率。     

基于视觉标记的增强现实系统建模及配准误差问题研究

针对当前基于视觉的增强现实系统标记大、成本高的缺陷,提出一套结合简单组合标记的增强现实系统的实现方案.基于弱透视模型,以色彩和形状作为融合特征,研究了利用冗余特征实现标记物体的3D位姿还原方法.为使配准方案能够适应普通的视觉采集设备,提出根据摄像机标定时得到的扭曲参数对渲染后的模型进行再扭曲的配准修正方法.结合OpenCV和OpenGL中的空间变换的概念,给出了虚拟和物理世界配准融合的解决方案,并基于统计学数学模型,提出降低配准时的误差以及提升配准稳定性的方案.实验结果表明,提出的算法能有效地将静态标签的抖动降低至亚像素级.     

GaN‐based emissive microdisplays: A very promising technology for compact,ultra‐high brightness display systems

High‐brightness GaN‐based emissive microdisplays can be fabricated with different approaches that are listed and described. They consist either of hybridizing a GaN LED array on a CMOS circuit or building a monolithic component on a single substrate. Using the hybridization approach, two types of 10‐μm pixel pitch GaN microdisplay prototypes were developed: (1) directly driven, 300 × 252 pixels and (2) active‐matrix, 873 × 500 pixels. Brightness as high as 1 × 10⁶ and 1 × 10⁷ cd/m² for blue and green arrays, respectively, were reached. GaN‐based emissive microdisplays are suitable for augmented reality systems or head‐up displays, but some challenges remain before they can be put in production.