A Mixed Reality System for Investigating Expert Characteristics on Recall of Situation Including Self-Motion

To study recall accuracy of the offensive and defensive situations including movements of elite-athlete/novice oneself, a novel experimental system was developed where defensive actions were performed by the subject with a CG （Computer Graphics） player who presented predetermined offensive actions. Both the CG player＇s movements and subject＇s movements were reproduced by a video using mixed reality technology for recall examination. This system was also designed to rearrange the natural sequence of image frames resulting in a reproducible video in which the time relation of offense and defense was falsified. Displacement of timing in the false video was twofold; delayed from the truth or advanced from the truth. Using this two-video, true/false imagery method, the subject was asked to select the true video by recall; thus it became possible to examine the recall accuracy quantitatively by controlling the timing displacement. Results of the experiment using this system revealed that karate expert possessed a skill to recognize the time relation between the opponent＇s movement and one＇s own movement perceptually that was more developed than that of the novice. It was further identified that the expert as well as the novice recognized delayed displacement more accurately than they could recognize advanced displacement.

Research on the Dynamic Simulation System of Maize Growth

Dynamic simulation system of maize growth is developed by the physiological and ecological model,morphological structure model,computer science and virtual reality technology,to improve the level of precise operation of maize production.The computer graphics algorithms,virtual reality technology,animation design and information integration technology are applied to maize production by this system.establishment of dynamic simulation system of maize growth is conducive to raise level of precise operation in maize production.The system also can assist the relevant production research and testing,to reduce cost and improve efficiency.

A Novel Approach in Hydrogeochemical Exploration for Uranium Mineralization:an Example from West Central Sinai,Egypt

Groundwater in contact with ore deposits may acquire a chemical composition that could be used as a guide for exploration. Eight well-water samples are collected from a known uraniummineralized area near Abu Zenima, west central Sinai to examine the applicability of using the hydrogeochemical technique in the search for uranium mineralization in similar arid areas. The analytical chemical data of the ground water is compared with ground radiometric measurements. The obtained results indicate that groundwater affected by uranium mineralization has a specific relativity of major anions expressed essentially as SO_4〉Cl〉HCO_3 and to a lesser extent as Cl〉SO_4〉HCO_3, associated as a rule with low magnesium content. This association constitutes a signature of uranium mineralization on the composition of groundwater in west central Sinai and could be used as an important exploration guide in the search for uranium deposits in similar areas. Anomalies in Ni, Fe, Zn and Cr and other pathfinder elements in groundwater can furnish geochemical guides to uranium ores. The immobile trace element anomalies, including Zn, Ni and Fe are strongly distributed near the orebody; whereas the relatively mobile trace elements, including Co, U, V and Cr, constitute the dispersion haloes away from the orebody. A new hydrogeochemical discrimination diagram is constructed to be used as a quick and cost effective exploration tool in the search for uranium occurrences in environmentally similar arid areas. Based on the obtained results, a new site for uranium occurrence, west of W. Baba, is delineated and recommended for future detailed geological and geochemical surveying.

Digital earth, Virtual Reality and urban seismic disaster simulation

US Vice President Al Gore's vision of Digital Earth applies us with prospects for brand-new ways of solving problems the earth is facing such as seismic disaster. ms paper first briefly introduces the concept of Digital Earth. Then in the context of Digital Earth. the Origin, concept and application of Virtual Reality technology are reviewed. After that we present in detail our preliminary case study--CVR-USD (Computer Virtual Reality for Urban Seismic Disaster Simulation) System which aims to simulate and manage seismic disaster through integrating RS, GIS and VR technologies. For this system, we've built USD subsystem, developed SMVR software to implement CVR. and also developed a Spatial Dare Analysis Package to handle spatial data related to earthquake disaster.

Smart Modeling of Maritime Vessels

Currently, the market offers many visualization tools available to graphic designers, engineers, managers and academics working on maritime environments. The practice of visualization involves making and manipulating images that convey novel phenomena and ideas. Visual communication, together with virtual reality environments, is an emerging and rapidly evolving discipline. It brings great advantage over written word or voice alone, as visual sense is by far the most dominant component of human sensory perception. A new smart approach for modeling maritime vessels is described in this paper. Various ways of making modeling relevant for work within the field of maritime management, training and education are discussed.

Editing Vector Graphics in the Virtual Simulation Environment

We present a method to represent multi-resolution vector graphics such as road networks or railway networks in virtual environment. These vector data can be interactively edited and the landscape and be explored in real time at any altitude from flight view to car view. We design a context-focused vector description of linear can areal features, with associated customized definition painter to specify their appearance （color and material） and their display mode （detailed mode or simplified mode）. There are some special problems in drawing vector graphics in virtual environment. Floating-point round-off error appear when we use a low view point to observe the scene, and it leads to scene jittering. Drawing 3D wide lines turns into a problem on 3D terrain. We design a view-based self-adaptive interpolation algorithm and an offset line generating algorithm to solve it. Our results show high performance with good visual quality.

虚拟现实中场景和时间对用户空间方向认知的影响

方向感是用户通过观察或漫游场景,根据个人感知建立心理地图,并理解和判断地图信息,产生对方向、角度、距离等信息判断的能力。在心理学和医学等领域,大量研究表明方向感由空间记忆、空间感知、空间想象等多重因素影响。在虚拟环境中,用户同样依赖这种能力判断方向,利用虚拟设备获取场景信息。本研究主要讨论用户如何通过空间记忆、感知与想象等能力在虚拟场景中判断方位。研究定义了用户的方向感度量包括准确率和效率2个方面,其中准确率是用户与目标朝向和位置的角度误差和距离误差,效率是用户判断方向的决策时间和到达目标的移动时间,通过6个实验,旨在探究视觉场景差异对用户方向感的影响。实验结果显示:(1)视觉信息是虚拟现实(VR)中用户判断方向的重要依据;(2)在场景结构相似的前提下,较小空间和较多物品的设置能够提升用户的方向感;(3)在视觉范围不变的前提下,场景风格的变化对用户方向感的影响较小。另外,用户方位判断的准确率还受到决策时间和移动时间的影响,其中移动时间的影响更为显著,而决策时间则影响相对较小。本研究的发现有助于VR场景构建、度量用户方向感、以及优化场景布局和提高用户导航能力。

用于重建物理和虚拟抓取的可重构数据手套

In this work,we present a reconfigurable data glove design to capture different modes of human hand-object interactions,which are critical in training embodied artificial intelligence(AI)agents for fine manipulation tasks.To achieve various downstream tasks with distinct features,our reconfigurable data glove operates in three modes sharing a unified backbone design that reconstructs hand gestures in real time.In the tactile-sensing mode,the glove system aggregates manipulation force via customized force sensors made from a soft and thin piezoresistive material;this design minimizes interference during complex hand movements.The virtual reality(VR)mode enables real-time interaction in a physically plausible fashion:A caging-based approach is devised to determine stable grasps by detecting collision events.Leveraging a state-of-the-art finite element method,the simulation mode collects data on fine-grained four-dimensionalmanipulation events comprising hand and object motions in three-dimensional space and how the object's physical properties(e.g.,stress and energy)change in accordance with manipulation over time.Notably,the glove system presented here is the first to use high-fidelity simulation to investigate the unobservable physical and causal factors behind manipulation actions.In a series of experiments,we characterize our data glove in terms of individual sensors and the overall system.More specifically,we evaluate the system's three modes by①recording hand gestures and associated forces,②improving manipulation fluency in VR,and③producing realistic simulation effects of various tool uses,respectively.Based on these three modes,our reconfigurable data glove collects and reconstructs fine-grained human grasp data in both physical and virtual environments,thereby opening up new avenues for the learning of manipulation skills for embodied AI agents.

Power equipment vibration visualization using intelligent sensing method based on event-sensing principle

Vibration measurements can be used to evaluate the operation status of power equipment and are widely applied in equipment quality inspection and fault identification.Event-sensing technology can sense the change in surface light intensity caused by object vibration and provide a visual description of vibration behavior.Based on the analysis of the principle underlying the transformation of vibration behavior into event flow data by an event sensor,this paper proposes an algorithm to reconstruct event flow data into a relationship correlating vibration displacement and time to extract the amplitude-frequency characteristics of the vibration signal.A vibration measurement test platform is constructed,and feasibility and effectiveness tests are performed for the vibration motor and other power equipment.The results show that event-sensing technology can effectively perceive the surface vibration behavior of power and provide a wide dynamic range.Furthermore,the vibration measurement and visualization algorithm for power equipment constructed using this technology offers high measurement accuracy and efficiency.The results of this study provide a new noncontact and visual method for locating vibrations and performing amplitude-frequency analysis on power equipment.

一种辅助“三维室内建模”实验教学的移动AR系统

在“三维室内建模”实验教学环节中,针对模型结构、纹理的繁杂多样以及学生三维空间感知能力不足等导致的实验教学质量低的问题,文章提出运用Unity3D引擎、AR Foundation开发平台和SenseAR XR Plugin插件开发一个辅助实验教学的Android移动端增强现实系统,登录后可对模型结构进行多视角观看,可以实时更换模型以及材质等,通过这种具有沉浸感的三维结构与可视化交互操作,提高学生的建模效率、三维空间感知能力以及创新设计能力。该研究为“三维建模”方向的实验教学提供了一种新的教学手段。

基于虚拟现实的船用甲板机器人工作状态智能监测系统

船舶甲板机器人可帮助船舶高效率除锈,并降低船员工作强度,减少安全事故发生。传统的船舶机器人监控系统只能查看机器人的所有工作状态参数,无法形象地展示机器人工作状态。本文在对虚拟现实技术充分研究的基础上,设计甲板机器人状态监测系统,并设计系统传感信息采集的硬件结构。构建基于虚拟现实技术的机器人工作状态智能监控系统,对系统中的碰撞检测技术以及虚拟交互实现方法进行分析。通过将机器人的状态实时反馈到虚拟场景中,有效实现操作者和机器人之间的实时交互,实现在线操控监测和离线教学的功能。

飞行仿真系统虚拟仪表关键技术探究

该文研究基于增强现实(AR)技术和图形渲染技术的飞行仿真虚拟仪表系统。利用实时光线追踪技术和高精度图像渲染算法,显著提升虚拟仪表的视觉真实感。结合AR技术,飞行员能够在仿真环境中实时获取动态调整的飞行信息,并通过手势识别和语音控制实现交互式操作。研究结果表明,AR与图形渲染技术的结合在提高飞行仿真系统的真实感、操作便捷性和安全性方面具有显著优势,为飞行训练和飞行器设计提供新的发展方向。

“虚实相生”理念在平面设计中的应用探究——以靳埭强作品为例

中国平面设计的发展不能一味地追随西方潮流,设计师亟需深入地学习和研究中华传统文化,从中汲取核心思想与内涵,从而设计出具有中国精神、中国韵味的作品。分析靳埭强的平面设计作品中“虚实相生”的思想,从书画形式、留白处理、水墨色彩3个方面探究其思想的具体应用。在经济全球化背景下,设计师需要设计出具有地域性民族风格的作品才能更好地在世界上立足。靳埭强平面设计思想的研究对中国当代平面设计的发展有着重要的借鉴意义,为中国平面设计师的思想与设计方向提供启示和参考。

植物智能识别与三维建模应用研究

资料分析显示,基于国外植物图像的三维虚拟现实技术已广泛应用于多领域。该方法在保留原始纹理和颜色特征的基础上,实现了建模与模拟,便于研究者近距离、多角度观察植物,深入了解其形态特征与生理状况。本文分析了现有智能识别APP结合细胞神经网络(Cellular Neural Network,CNN)和支持向量机(Support Vector Machine,SVM)的无人机多光谱遥感拍照技术,在对比筛选提前录入数据库的植物以及在APP软件界面展示三维(3D)场景时存在的问题,提出了相应解决方案。文章最后就如何克服这些难题提出了建议,旨在为植物数字三维虚拟现实技术的发展提供参考。

基于虚拟现实的水电工程施工动态可视化仿真研究

针对水利水电工程施工动态仿真的复杂性,基于虚拟现实技术,采用高效的图形渲染引擎,进行物理系统的模拟,展现出具有真实感的可实时交互的虚拟场景,并将系统仿真信息与图形紧密结合起来,为水利水电工程的设计、管理提供一种全新的环境,为决策者提供更科学、直观的依据。

一种面向遥操作的新型数据手套研制

本文主要介绍了自制的 BHG- 型数据手套的设计、原理和实验 ,给出了该数据手套的性能、优缺点和实验数据 ,并借助图形仿真模型验证了利用数据手套在虚拟环境下进行人机交互的可行性 ,最后通过数据手套对灵巧手控制实验说明了其在遥操作领域应用的有效性 .

“虚拟现实”康复工程前景初探

介绍了虚拟现实技术及康复医疗的发展现状，讨论了将此项技术用于康复医疗的合理性与可能性，我们认为将虚拟现实技术引入康复训练能够很好地实现心理诱导与康复训练的结合，大大减轻患者在康复训练中的烦躁情绪，它将为康复工程带来一场技术革命。

基于增强现实技术的工程图学移动端教学系统设计与开发

依托当前快速发展的虚拟现实技术,以工程图学课程图感培养为目标,将增强现实技术引入课程教学,开发以移动终端为应用平台的辅助教学系统,将真实场景中的平面视图与虚拟三维立体模型相结合,通过视觉耦合叠加和增强交互操作突出体验的真实感,搭建起视图与形体间的以图感意识为桥梁的高效转换通道,提升了抽象三维形体的可接受度。配合课程讲解和课下辅导,学生能够有意识地强化图感在视图解读中的认知作用,该教学模式和资源的改革探索将有助于推动新时期工程图学教学的发展。

基于图像建模技术研究综述与展望

基于图像建模技术是计算机图形学和计算机视觉领域共同关心的重要问题 文中侧重从计算机图形学的研究角度对基于图像建模技术进行了综述 ,介绍了近年来提出的典型的基于图像建模方法及其最新研究进展 ,给出了这些方法的基本原理并加以分析比较 。

面向对象技术在三维虚拟场景建模中的应用研究

应用面向对象技术、虚拟现实技术、Open GL技术不仅研究了虚拟现实下三维图形的几何建模方法、物理建模方法 ,更重要的是探讨其行为建模方法 ,由此设计出了强大的类库及建立了复杂的三维虚拟场景 ,并应用该理论实现了三维虚拟场景中物体在仅受重力作用下的自主行为 ,在三维动画演示过程中 ,采取双缓存、细节层次技术以提高图形的动画显示性能 。