Level of detail algorithms have widely been implemented in architectural VR walkthroughs and video games, but have not had widespread use in VR terrain visualization systems. This thesis explains a set of optimizations to allow most current level of detail algorithms run in the types of multiple display systems used in VR. It improves both the visual quality of the system through use of graphics hardware acceleration, and improves the framerate and running time through modifications to the computations that drive the algorithms. Using ROAM as a testbed, results show improvements between 10% and 100% on varying machines.

Digital Earth is a kind of GIS application which use lots of computer techniques, including ¡§Computer Graphic¡¨, ¡§High quality Satellite Image¡¨, ¡§Multi-resolution¡¨, ¡¨ Metadata¡¨, ¡¨Level of detail¡¨, etc. In the past, geographers always tend to use triangle or grid structure to build 3D GIS. Now 3D GIS tend to use VRML to display virtual terrain data. Nevertheless, this display method is short of three-dimension analysis. It just uses 2.5 dimension to simulate 3 dimension space structure. This thesis is base on the theory of GeoVRML Quad-tree structure and use JAVA to implement ROAM algorithm. And this method can improve Quad-tree structure morphing error and raise virtual terrain display speed. This thesis use ETOPO5 5-minute DTM data to build Earth model (provide by NGDC) and Taiwan 40M DTM data, 200M, 100M, 50M, 25M satellite image to build Taiwan 3D GIS model. Meanwhile, this thesis addresses an unique three level structure to display 3D GIS model. One is Satellite Image layer, one is virtual terrain layer, and last one is 3D feature object.

現如今，生活在北京的人們同時處在或跨越著不同的的城市空間。在北京的 城六區，人們可以看到摩天大樓、立交橋、地鐵構成的現代建築和縱橫交錯的胡 同以及四合院式的「都市裡的村莊」。而在五環以外，既有房地產宣傳畫冊上遠 離塵囂依山傍水的高檔別墅群落，也存在一排排城郊平房組成的小社群。昔日的 皇城「紫禁城」，車水馬龍的西直門立交橋，高級住宅鱗次櫛比的城郊花園，自 家磚瓦堆砌的戶外廁所，這些都是北京。 再度來到北京，創作者藉由每天的行走與思考、拍攝與交談，進而仔細瞭解 北京這座城市，再現城市化發展進程中北京真實的城市形態。並通過搭地鐵漫遊 北京，通過鏡頭記錄北京。地鐵和照相機的組合讓創作者更加深入地瞭解北京的 每一個角落，捕捉這座城市的表情，記錄那些平日被我們忽略的畫面。 整個主題以攝影作品、故事分享會及民謠彈唱會三個部分所組成的主題攝影 展來呈現。 / In modern times, people in Beijing live in different city landscapes. The central six districts are constituted by modern buildings, such as skyscrapers and flyovers, together with traditional ones, or ‘urban villages’, such as quadrangle courtyard. However, on the edge of Beijing, luxurious villas and small bungalows stand together and contrast each other. The once-thrived palace, the busy flyovers and urban gardens, with huge differences, yet, all of these are parts of Beijing. Back to Beijing, the author has gained more understandings about this city and represented the real city landscape during the urbanization process through daily walking, thinking, taking photos, and talking. With the author’s camera and taking the subway, the author has been enabled to capture the every single corners in Beijing, having those ignored scenes documented. The entire work has been consisted of photography, story-sharing, and a un-plug mini concert.

No description available.

This work is focusing on optimization of large scale terrain rendering. It explains basic methods and data structures for optimization. It describes fundamentals of methods such as ROAM, Geometrical clipmaps, GPU Based Geometrical Clipmaps, GeoMipMapping and Chunked LOD. It explains implementation details of system for terrain optimization based on GeoMipMapping method.

<p>The problem of estimating an adequate level of detail for an object for a specific view is one of the important problems in computer 3d-graphics and is especially important in real-time applications. The well-known continuous level-of-detail technique, Real-time Optimally Adapting Meshes (ROAM), has been employed with success for almost 10 years but has at present, due to rapid development of graphics hardware, been found to be inadequate. Compared to many other level-of-detail techniques it cannot benefit from the higher triangle throughput available on graphics cards of today.</p><p>This thesis will describe the implementation of the new version of ROAM (informally known as ROAM 2.0) for the purpose of massive planetary data visualization. It will show how the problems of the old technique can be bridged to be able to adapt to newer graphics card while still benefiting from the advantages of ROAM. The resulting implementation that is presented here is specialized on spherical objects and handles both texture and geometry data of arbitrary large sizes in an efficient way.</p>

The problem of estimating an adequate level of detail for an object for a specific view is one of the important problems in computer 3d-graphics and is especially important in real-time applications. The well-known continuous level-of-detail technique, Real-time Optimally Adapting Meshes (ROAM), has been employed with success for almost 10 years but has at present, due to rapid development of graphics hardware, been found to be inadequate. Compared to many other level-of-detail techniques it cannot benefit from the higher triangle throughput available on graphics cards of today. This thesis will describe the implementation of the new version of ROAM (informally known as ROAM 2.0) for the purpose of massive planetary data visualization. It will show how the problems of the old technique can be bridged to be able to adapt to newer graphics card while still benefiting from the advantages of ROAM. The resulting implementation that is presented here is specialized on spherical objects and handles both texture and geometry data of arbitrary large sizes in an efficient way.

This thesis deals with improving thermal properties of contemporary ceramic fittings for external walls using built-in thermal insulation. In the practical part, PUR foam and PUR granulate waste mixes were designed. Based on insulation, mechanical and physical properties and estimated price, the best mix was chosen. Using the chosen mix as integrated isolation, the resulting ceramic block was simulated.

This study examined the nature and extent of relations between Management of Technology [MOT] and cost management. It explores the roles of competencies and competency measurement in these relations and its associations with company performance. The problem statement asks how the MOT community deals with cost management, whether MOT-based cost management competencies can be isolated and measured, whether a tool for measurement can be created, tested and validated and indeed whether it can be used to assess relations between MOT-based cost management competencies and company performance. To answer these questions, a MOT-based cost management competency index is formulated, consisting of problem statements representing MOT-based cost management insights, knowledge and practices. Designed in the format of a typical research survey, the index is used to source data from sampled companies listed on the Johannesburg Stock Exchange [JSE]. Although too small a sample to generalise about the population, sufficient data is collected and processed with statistical software programs. A second set of variables, about financial performance of the responding companies, consists of Asset Turnover [ATO] and Return on Assets Managed [ROAM]. Data for these variables is sourced from their annual financial statements and processed into ATO and ROAM indicators. The combined research data set is used to critically describe statistical qualities of variables such as ATO, ROAM, MOT-based cost management competencies of company executives, their education and exposure to the executive management teams in their respective organizations. The research data is subsequently subjected to correlation analysis, as foundation for hypothesis testing. Among the relationships described by correlation analysis and warranting further examination with regression analysis, are associations between MOT-based cost management competencies and ATO and between Education and MOT-based cost management competencies. The former association is found to be not significant, having the research hypothesis rejected. A significant association between Education and MOT-based cost management competencies is indeed found. Utilizing regression equations yielded by the analyses, the predictive capacity of regression analysis is used to demonstrate results of interventions in those associations postulated in the research hypotheses. The study concludes that it achieved a qualified success in its first objective, which was to formulate a MOT-based cost management competency index, and to demonstrate its application as measurement and management tool on executive managers of JSE-listed companies. The study failed in its second objective, which was to demonstrate a significant association between MOT-based cost management competencies and financial performance of sampled companies. Critical perspectives on the data and the associations tested reveal important shortcomings in the research. These perspectives do though create opportunities for refinement of the MOT-based cost management competency index as measurement and management tool, validation of its status, and indeed demonstration of its business value to the MOT and business community in particular. In closure, the study was meant as a contribution to the discourse on a credo for MOT and the MOT body of knowledge, and it subjects itself to critical analysis by the research community so as to establish whether it succeeded in indeed making such a contribution. / Business Management / M.Tech. (Business Administration)

Project (Ed.S.)--James Madison University, 2009. / Includes bibliographical references.