查询词典 virtual image

It will expose the design problem of maintainability of civil airplane to the early stage of design. This paper discusses the composing of the virtual maintenance environment, builds non-immersion virtual maintenance environment of undercarriage, and establishes a part library management system. The characteristic of maintainability models and maintainability analysis based on virtual technique is researched to give the maintainability frame model of civil airplane virtual maintainability analysis. All levels of maintenance time model and maintenance man-hour model are established. Analog-Huffman code is proposed to optimize space partition method in traditional collision detection arithmetic."Maintenance therblig"is brought into the broken down of maintenance tasks, and the new maintenance tasks broken down method is proposed. The demands of human measure, position, and equipment layout in human engineering are discussed, and the verification methods of human measure, position and equipment layout in virtual maintenance are given. Basic principle and verification procedure of maintainability virtual verification is developed primarily, and the reachablity, the visibility, and posture-comfortability are verified.

本文论述了虚拟维修环境的组成，构建了某型飞机主起落架非沉浸式虚拟维修环境，建立了维修对象的零件库管理系统；研究了基于虚拟技术的维修性模型特点及维修性分析流程，给出了基于虚拟技术的民机维修性分析框架模型，并结合传统维修性模型，建立了各级维修时间模型和维修工时模型；提出类HUFFMAN编码，结合人因工程的要求，优化了传统碰撞检测算法中的空间分割法，使之适用于柔体；在维修性分解中引入"维修动素"，给出了与CATIA、DELMIA等应用软件结合紧密的维修任务分解方法；论述了人因工程中对人体尺寸、姿势、设备布局的要求，给出了虚拟维修中人体尺寸、姿势分析、民机内设备布局的验证方法；初步制订了维修性虚拟验证的基本原则和验证程序，并结合具体实例对可达性、可视性、干涉性以及人体姿态舒适性进行了验证，较清晰、真实地反映了维修人员的维修状态。

In order to apply virtual reality technique into medical image processing, make convenient for surgeons to access virtual and mini invasive surgery, this paper, presents a full interactive virtual endoscopy system framework, analyzing and discussing system architecture and algorithm models. We explain some key procedures in virtual endoscopy system such as definition of world coordinate, virtual camera, surface detection, normal approximation, volume rendering and surface rendering, and also some interactive control method.

在综合利用各种计算机图形、图象技术的基础上，提出了完整的交互式虚拟内窥镜系统的框架，同时对系统结构和各种模型进行了分析和讨论，还针对系统的实时性和绘制结果的逼真性要求，提出了基于 Object Cache和扩展的区域增长方法，并将其应用到医学图象处理当中，得到了较好的效果。

By means of equalizing the histogram, the contrast of original thermal image is enhanced; then image region of the disc surface of insulator is intercepted manually; through the envelope of the smoothened histogram of thermal image the segmentation threshold is extracted and the morphological filtering is applied to the threshold- segmented binarized image to obtain insulator disc surface image and background image, and then 10 infrared image features of insulator disc surface image and background image, such as the highest temperature, the lowest temperature, mean temperature, variance of temperature distribution of both kinds of images, as well as maximum temperature rise and mean temperature rise of insulator disc surface relative to background, are extracted; finally, the good and bad features are discriminated by single factor variance analysis, thus the feature selection is implemented.

利用直方图均衡化增强原始热像图对比度，人工截取绝缘子盘面图像区域；通过平滑后的图像直方图包络线提取分割阈值，对阈值分割后的二值图像进行形态学滤波，得到绝缘子盘面图像和背景图像，提取2者的最高温度、最低温度、平均温度、温度分布方差以及盘面相对于背景的最大温升和平均温升共10个红外热像特征；应用单因素方差分析甄别特征优劣，实现特征选择。

To aim at the differences in the ingredients which should be considered when different cooperative partners are chosen in virtual supply chain, the evaluation index system of upstream cooperative partner, downstream cooperative partner and logistics enterprise in networked virtual supply chain are established. Based on the differences of constructive technologies of traditional supply chain, the cooperative partner selection mode of networked virtual supply chain is established. The application of AHP in cooperative partner selection of virtual supply chain is researched. The dynamic construction mechanism of networked virtual supply chain is put forward to deal with all kinds of exceptions in the supply chain execution.

之后，针对在选择虚拟供应链上的不同合作伙伴过程中考虑因素的不同，分别建立了网络化制造环境下虚拟供应链上游合作伙伴的评价指标体系、下游合作伙伴的评价指标体系和物流企业的评价指标体系；比较分析了传统供应链的组建技术，建立了网络化虚拟供应链的合作伙伴选择过程模型，并具体研究了层次分析法在虚拟供应链合作伙伴选择中的应用；提出了网络化虚拟供应链的动态组建机制，以应对虚拟供应链运行过程出现的各种例外情况。

Classroom Deployment 4.1 Equipment In order to use the world to deliver a lecture the following items of equipment are required: Desktop/Laptop positioned at the front of the classroom Data projector/LCD Panel/Plasma Panel connected to the above Desktop/Laptop (to provide lecturer with view of 'virtual students') 50 Plasma Panel (to provide lecturer with view of 'virtual students') connected to the above Speakers ( to enable lecturer and students in physical classroom to hear 'virtual students' ) Microphone ( to enable 'virtual students' to hear lecturer and students in physical classroom) Axis 212 PTZ Network Camera ( to provide live video of lecture in virtual classroom) 4.2 Layout The equipment in the classroom should be positioned as shown by Fig.

4课堂部署 4.1设备为了利用世界各地发表演讲下列项目所需的设备：台式电脑/笔记型电脑定位在前面的课堂数据投影机/ LCD屏/等离子面板连接到上述台式电脑/笔记型电脑（提供讲师与鉴于'虚拟学生） 50 等离子面板（与提供讲师认为'虚拟学生的）连接到上述发言者（以使教师和学生在体育课堂上听到'虚拟学生）麦克风（使'虚拟学生听到教师和学生在体育课堂）轴212云台网络摄像机（提供视频直播的演讲中虚拟教室） 4.2布局该设备在课堂上应定位为所表现出图。

This article take the personality learning to combine with the virtual learning community,attempt to study the virtual learning community which is a new thing ideal condition that this new things to offers ideal fictitiously for the middle school student's personality learning,further more,this article put forward a strategy about structuring a virtual learning community which based on the personality learning for middle school student,at last,the article analyze the virtual learning community about the basic education founded by The Capital Normal University,it has a strong effective on the field virtual learning community.

本文将个性化学习与虚拟学习社区相结合，试图通过探索虚拟学习社区这一新生事物为中学生的个性化学习提供的理想条件，进而提出关于构建一个基于个性化学习的中学生虚拟学习社区的有效设计策略，最后深入分析当前比较有影响的首都师范大学关于基础教育方面的虚拟学习社区，提出其中的优点和不足。

To solve this problem, based on the concept of graph theory we give a few models and arithmetic designs of virtual backbone in the environment of different application, and propose the corresponding routing mechanism with these virtual backbones. The major achievements are outlined as follows:The state of host's power or the time of host's online plays an important role in keeping stability of a virtual backbone. With a view to this feature, the paper introduces a simple and efficient heuristic algorithm for calculating the virtual backbone by seeking a minimum connected dominating set with maximal weight. The maximality of the weight-based choice of backbone nodes guarantees that the most suitable nodes have been chosen for the role of backbone nodes so that they can properly coordinate all the other nodes and keep stability of the virtual backbone in the network.

为了解决这个问题，本文利用网络图论中的一些理论，在不同的应用环境下给出几种虚拟骨干网的模型、构建及基于稳定性和节能的算法设计，并针对这些骨干网提出相应的分层路由机制，主要研究内容和贡献如下：考虑到主机的功率大小和在线时间长短对虚拟骨干中心的相对稳固性的影响，提出用基于极大权的最小连通支配集模拟虚拟骨干网；并给出其数学模型和相应的启发式算法，确保了性能强的主机担任骨干节点；通过优化规则确保骨干网的极小性，有效地减小了控制分组转发开销；最后进行了仿真验证。

It has carried out a physical experiment building and a virtual laboratory of electromagnetic induction based on VRML, using 3D MAX and VRML to make the three dimensional virtual test equipment, and produces the strategy which could optimize the VRML document, unify VRML and script language JavaScript to realize the object alternately operation in the three dimensional scene ; Using the embed element to insert the virtual experimental file to the HTML documents and realizes the network issue of virtual experimental system, which enables the studier to carry on the browsing study through Internet. And finally this thesis gives an introduction of the test appraisal situation of this virtual experiment.

具体是基于VRML实现了一栋物理实验大楼及一个电磁感应虚拟实验室，利用3D MAX、VRML进行三维虚拟实验设备的构建，并给出了优化VRML文件的策略，结合VRML和脚本语言JavaScript实现三维场景中模型对象的交互操作，使用embed元素将虚拟实验文件嵌入到HTML文档中实现虚拟实验系统的网络发布，使学习者能通过Internet进行浏览学习，最后介绍了该虚拟实验系统的试用评价情况。

Its software development tool are very important to the applications of virtual reality technology because of the rapid development of network technology Being aimed of the shortcoming that the development for the distributed parallelism of simulation computing unit is not enough and formal in current distributed virtual environment systems, we study the modeling language of virtual environment and the system architecture of distributed virtual environment in a new view point, build a complete extensible theory framework novelly for the research of virtual environment technology.

本文针对当前分布式虚拟环境系统对仿真计算单元的分布并行性开发不够充分和规范的缺点，从一个全新的角度来研究虚拟环境的建模语言及其分布式虚拟环境的系统结构，开创性地为虚拟环境技术的研究建立了一个全面可扩展的理论框架。

Firstly, virtual water contents were calculated for primary farm products and for virtual water consumption of residents in Jiangxi Province in 2000. The virtual water contents of crops was 284.81×108 m^3, and the virtual water consumption of rural residents 670.17 m^3. Then, based on the predecessors' study results, the difference of virtual water con- sumption of residents between Jiangxi Province and Shanxi Province was analyzed.

首先计算2000年江西省主要农产品虚拟水含量和城乡居民生活消费虚拟水含量，得出粮食作物的虚拟水含量为284.81×108立方公尺；城镇居民人均消费主要产品的虚拟水量为768.27立方公尺；农村居民人均消费主要产品的虚拟水含量为670.17立方公尺。

Foods high in this vitamin include oily fish such as salmon, tuna and, and fish liver oils.

维生素D含量高的食物包括诸如大麻哈鱼、金枪鱼和鲭鱼之类的油鱼以及鱼肝油。

We need you to cosign our public letter demanding that press intimidation cease immediately, and that all charges be dropped.

我们需要您cosign我们的公共信，要求记者立即停止恐吓，并要求所有收费下降。