基于Wiki的教育叙事研究

为使广大一线教师更加关注教育叙事研究,通过Wiki不断完善自我,为教育事业做出更大的贡献,就Wiki与教育叙事研究的内涵和特点,分析了基于Wiki的教育叙事研究相比传统的教育叙事研究所具有的优势,对新课改下教师如何基于Wiki这个平台开展教育叙事研究来提升自己的专业能力进行了探讨。     

基于三维虚拟样机技术大型林业装备设计与研究

针对我国林业机械研制的落后现状,以国家科技支撑项目为例,以SolidWorks软件为平台设计我国首台林木联合采伐机底盘,论述了采用现代三维虚拟技术进行大型林业装备设计的开发过程,重点说明了采用这一技术加快我国林业装备研制步伐,提高了林业机械产品的设计效率,增强了企业市场竞争力的重要现实意义。     

多安全模式内容管理系统研究

内容管理系统是目前企业信息管理领域的研究热点。该文介绍了企业内容管理系统的意义和技术发展趋势,并分析了现在企业系统中存在的问题。针对中小企事业单位的需求,设计和实现了易特内容管理系统,尤其在安全性上的改进,保障了企业各类信息的安全可靠。其实现思路对于提高内容管理系统在企业的应用提供了很好的参考价值。     

支持装备维修训练的虚拟样机模型研究

按照层次化建模和按需求剪裁的思路,建立了一种新的虚拟样机模型框架,包括层次模型、外观模型、状态模型、功能模型、交互模型、关联关系模型和信息模型七部分。这种虚拟样机模型框架可以支持装备虚拟维修训练的各个环节,简化虚拟样机建模工作的复杂性和工作量。     

旋风预热器教研平台的设计与实现

本文介绍了一种新型的旋风预热器教研平台系统,它源于水泥回转窑实际系统并同时结合教研的需求做了诸多改进。该系统由旋风预热筒设备、单片机控制系统、调速风机及电加热等执行装置及其上位机管理系统组成的一个完整系统。文章对各个组成部分的软硬件设计实现进行了阐述,对其技术特点做了详细说明,该系统涵盖知识面广,被控对象复杂,非常适合开展综合性试验及控制策略研究,经实践教研检验该教研平台较常规试验平台有更好的效果。     

未知环境下的移动机器人环境建模研究

环境建模技术是移动机器人自主导航研究中的一个关键问题。本文给出一种基于多传感器信息融合的环境建模方法。实验结果表明该方法有效地克服了传感器的累计误差,有效地提高了环境建模的准确性。此方法的可行性和有效性通过Pioneer3-DX移动机器人得到了实验验证。     

The Visual Computing of Projector‐Camera Systems

This article focuses on real‐time image correction techniques that enable projector‐camera systems to display images onto screens that are not optimized for projections, such as geometrically complex, coloured and textured surfaces. It reviews hardware‐accelerated methods like pixel‐precise geometric warping, radiometric compensation, multi‐focal projection and the correction of general light modulation effects. Online and offline calibration as well as invisible coding methods are explained. Novel attempts in super‐resolution, high‐dynamic range and high‐speed projection are discussed. These techniques open a variety of new applications for projection displays. Some of them will also be presented in this report.     

Camera Control in Computer Graphics

Recent progress in modelling, animation and rendering means that rich, high fidelity virtual worlds are found in many interactive graphics applications. However, the viewer's experience of a 3D world is dependent on the nature of the virtual cinematography, in particular, the camera position, orientation and motion in relation to the elements of the scene and the action. Camera control encompasses viewpoint computation, motion planning and editing. We present a range of computer graphics applications and draw on insights from cinematographic practice in identifying their different requirements with regard to camera control. The nature of the camera control problem varies depending on these requirements, which range from augmented manual control (semi‐automatic) in interactive applications, to fully automated approaches. We review the full range of solution techniques from constraint‐based to optimization‐based approaches, and conclude with an examination of occlusion management and expressiveness in the context of declarative approaches to camera control.     

High Performance GPU‐based Proximity Queries using Distance Fields

Proximity queries such as closest point computation and collision detection have many applications in computer graphics, including computer animation, physics‐based modelling, augmented and virtual reality. We present efficient algorithms for proximity queries between a closed rigid object and an arbitrary, possibly deformable, polygonal mesh. Using graphics hardware to densely sample the distance field of the rigid object over the arbitrary mesh, we compute minimal proximity and collision response information on the graphics processing unit (GPU) using blending and depth buffering, as well as parallel reduction techniques, thus minimizing the readback bottleneck. Although limited to image‐space resolution, our algorithm provides high and steady performance when compared with other similar algorithms. Proximity queries between arbitrary meshes with hundreds of thousands of triangles and detailed distance fields of rigid objects are computed in a few milliseconds at high‐sampling resolution, even in situations with large overlap.     

无线传感器网络中一种新的分布式定位方案研究

Node localization in wireless sensor networks (WSN) is treated as a functional dual of target tracking from a novel perspective in the paper. Different from the traditional tracking problem in WSN, using the static location-ware node to estimate the moving target, the mobile node is used to help unknown nodes to accurately discover their positions. A new node localization scheme virtual beacons-energy ratios localization (VB-ERL) and its refinements for the WSN are presented. In the scheme, the mobile node moves in the surveillant field based on the Gauss-Markov mobility model and periodically broadcasts the information packets. Each static unknown node receives the virtual beacons and energy in its sensing range, and estimates its location by finding the intersection of a set of hyper-spheres. Simulation results show the proposed scheme is efficient.