To see the other types of publications on this topic, follow the link: Three-dimensional form.
Dissertations / Theses on the topic 'Three-dimensional form'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Three-dimensional form.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Ko, Kwang Hee 1971. "Algorithms for three-dimensional free-form object matching." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29751.
Full textAbstract:
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2003.Includes bibliographical references (leaves 117-126).
This thesis addresses problems of free-form object matching for the point vs. NURBS surface and the NURBS surface vs. NURBS surface cases, and its application to copyright protection. Two new methods are developed to solve a global and partial matching problem with no a priori information on correspondence or initial transformation and no scaling effects, namely the KH and the umbilic method. The KH method establishes a correspondence between two objects by utilizing the Gaussian and mean curvatures. The umbilic method uses the qualitative properties of umbilical points to find correspondence information between two objects. These two methods are extended to deal with uniform scaling effects. The umbilic method is enhanced with an algorithm for scaling factor estimation using the quantitative properties of umbilical points. The KH method is used as a building block of an optimization scheme based on the golden section search which recovers iteratively an optimum scaling factor. Since the golden section search only requires an initial interval for the scaling factor, the solution process is simplified compared to iterative optimization algorithms, which require good initial estimates of the scaling factor and the rigid body transformation. The matching algorithms are applied to problems of copyright protection.
(cont.) A suspect model is aligned to an original model through matching methods so that similarity between two geometric models can be assessed to determine if the suspect model contains part(s) of the original model. Three types of tests, the weak, intermediate and strong tests, are proposed for similarity assessment between two objects. The weak and intermediate tests are performed at node points obtained through shape intrinsic wireframing. The strong test relies on isolated umbilical points which can be used as fingerprints of an object for supporting an ownership claim to the original model. The three tests are organized in two decision algorithms so that they produce systematic and statistical measures for a similarity decision between two objects in a hierarchical manner. Based on the systematic statistical evaluation of similarity, a decision can be reached whether the suspect model is a copy of the original model.
by Kwang Hee Ko.
Ph.D.
2
Stewart, Robyn, and n/a. "The effect of three-dimensional art works made by adults on children's construction of three-dimensional form." University of Canberra. Education, 1987. http://erl.canberra.edu.au./public/adt-AUC20061109.090237.
Full textAbstract:
Many studies of children's learning in Art education have focused
on the young child working in two-dimensional processes. This
study examined ways in which emerging-adolescents worked three dimensionally
with clay. The purpose of the study was to discover
whether the introduction of adult models of three-dimensional form
would affect the way the child perceived and constructed threedimensional
form. These models were presented as perceptual
frames of reference related to the problem confronting the child.
The development of perceptual differentiation skills and perceptual,
manipulative and conceptual modes of learning underpin this
investigation.
Four intact classrooms of 12 year olds were studied and the
results were examined by a panel of judges. A rating scale
devised by the author was applied to each model. The scale was
designed to measure five aspects of three-dimensional form.
Results indicated that three-dimensional art works made by adults
do affect aspects of the way children approach visual problem solving. Implications for the use of such frames of reference in
the art classroom and indications of associated motivational and
attitudinal changes are presented in the study.
3
Xiao, Lin. "Symmetric weak-form integral equation method for three dimensional fracture analysis /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.
Full text
4
Mary, Gaëtan. "Magnetic approaches to form and to stimulate three-dimensional tissue models." Thesis, Université de Paris (2019-....), 2020. https://theses.md.univ-paris-diderot.fr/Mary_gaetan_va1.pdf.
Full textAbstract:
Cette thèse présente l’utilisation de force magnétiques dans le but de former et de stimuler mécaniquement des agrégats multicellulaires. Ces structures 3D, composées de cellules jointes les unes aux autres, sont considérées comme des bons modèles de tissus biologiques. Ici, des cellules magnétiques sont utilisées afin de créer des agrégats magnétiques présentant des formes et des tailles contrôlées, et de les soumettre à des contraintes mécaniques sans aucune matrice extérieure. Trois sujets sont abordés: (i) le magnétisme induit est utilisé afin de réaliser de la rhéologie tissulaire (ii) le magnétisme induit est utilisé afin d’appliquer une large contrainte anisotropique à des modèles de tumeurs cancéreuses (iii) enfin, le magnétisme induit est utilisé afin d’améliorer la différenciation d’agrégats composés de précurseurs de tissus musculaires squelettiques et cardiaquesThis thesis presents the use of magnetic forces as a tool to form and to mechanically stimulate multicellular aggregates. These 3D structures, composed of interconnected cells, are considered as relevant models of biological tissues. Herein, magnetic cells are spatially controlled to create magnetic multicellular aggregates presenting specific shapes and sizes, and to subject them to remote mechanical stimuli without any external scaffold. Three different subjects are addressed: (i) the use of magnetic approaches to perform tissue rheology (ii) the use of magnetic forces to apply large anisotropic deformation on tumor models (iii) finally, the use of magnetic forces to enhance the differentiation of multicellular aggregates composed of cardiac muscle and skeletal muscle precursors
5
Mughal, Bilal Hafeez. "A calculation method for the three-dimensional boundary-layer equations in integral form." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12938.
Full text
6
Baurley, Sharon. "An exploration into technological methods to achieve three-dimensional form in textiles." Thesis, Royal College of Art, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516679.
Full text
7
Unger, Jonas, Stefan Gustavson, Larsson Per, and Anders Ynnerman. "Free Form Incident Light Fields." Linköpings universitet, Visuell informationsteknologi och applikationer, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-16286.
Full textAbstract:
This paper presents methods for photo-realistic rendering using strongly spatially variant illumination captured from real scenes. The illumination is captured along arbitrary paths in space using a high dynamic range, HDR, video camera system with position tracking. Light samples are rearranged into 4-D incident light fields (ILF) suitable for direct use as illumination in renderings. Analysis of the captured data allows for estimation of the shape, position and spatial and angular properties of light sources in the scene. The estimated light sources can be extracted from the large 4D data set and handled separately to render scenes more efficiently and with higher quality. The ILF lighting can also be edited for detailed artistic control.
8
Matthews, Janette. "Textiles in three dimensions : an investigation into processes employing laser technology to form design-led three-dimensional textiles." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/9058.
Full textAbstract:
This research details an investigation into processes employing laser technology to create design-led three-dimensional textiles. An analysis of historical and contemporary methods for making three-dimensional textiles categorises these as processes that construct a three-dimensional textile, processes that apply or remove material from an existing textile to generate three-dimensionality or processes that form an existing textile into a three-dimensional shape. Techniques used in these processes are a combination of joining, cutting, forming or embellishment. Laser processing is embedded in textile manufacturing for cutting and marking. This research develops three novel processes: laser-assisted template pleating which offers full design freedom and may be applied to both textile and non-textile materials. The language of origami is used to describe designs and inspire new design. laser pre-processing of cashmere cloth which facilitates surface patterning through laser interventions in the manufacturing cycle. laser sintering on textile substrates which applies additive manufacturing techniques to textiles for the generation of three-dimensional surface patterning and structures. A method is developed for determining optimum parameters for laser processing materials. It may be used by designers for parameter selection for processing new materials or parameter modification when working across systems.
9
Deng, Shengfu. "A Spatial Dynamic Approach to Three-Dimensional Gravity-Capillary Water Waves." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/28254.
Full textAbstract:
Three-dimensional gravity-capillary steady waves on water of finite-depth, which are uniformly translating in a horizontal propagation direction and periodic in a transverse direction, are considered. The exact Euler equations are formulated as a spatial dynamic system in which the variable used for the propagating direction is the time-like variable. The existence of the solutions of the system is determined by two non-dimensional constants: the Bond number b and λ (the inverse of the square of the Froude number). The property of Sobolev spaces and the spectral analysis show that the spectrum of the linear part consists of isolated eigenvalues of finite algebraic multiplicity and the number of purely imaginary eigenvalues are finite. The distribution of eigenvalues is described by b and λ.
Assume that C1 is the curve in (b,λ)-plane on which the first two eigenvalues for three-dimensional waves collide at the imaginary axis, and that the intersection point of the curve C1 with the line λ=1 is (b0,1) where b0>0. Two cases (b0,1) and (b,λ) â C1 where 0< b< b0 are investigated. A center-manifold reduction technique and a normal form analysis are applied to show that for each case the dynamical system can be reduced to a system of ordinary differential equations with finite dimensions. The dominant system for the case (b0,1) is coupled Schrödinger-KdV equations while it is a Schrödinger equation for another case (b,λ) â C1. Then, from the existence of the homoclinic orbit connecting to the two-dimensional periodic solution (called generalized solitary wave) for the dominant system, it is obtained that such generalized solitary wave solution persists for the original system by using the perturbation method and adjusting some appropriate constants.Ph. D.
10
Jastrzebski, Marek J. (Marek Jaroslaw). "Software for analysis of three dimensional statistical tolerance propagation in assemblies using closed-form matrix transforms." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13824.
Full text
11
Lundgren, Mina. "Distorted Essentials." Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-17719.
Full textAbstract:
This text is dealing with the intersection of three main elements: abstraction, geometrical form and distortion. Together these three paths forms garments around and in relation to the body. Throughout the project body is reduced into rectangular planes and cylinders. To reduce body into geometrical shapes can be explained as a method or a system through which body is approach as a neutral form. Because body is the source for abstraction, this approach can be applied to any part of the body and repeated in various compositions as it will always relate to a body form in some ways. The project also focuses on how to build holistic compositions through hues. Geometrically reduced body shapes are arranged through three dimensional compositions in which relationships between dominant, subdominant and subordinate forms are specifically in focus. Garments are embodied through weaving, Dominant and subdominant forms are investigated through distortion as a result of leaving warp and weft threads unattached in certain areas in the woven material. The technique expresses both organic and geometric in the material itself. In combination with colour blocks and panels and cylinders as forms, the technique was able to be translated into wearable forms. The project was developed as a dialogue between intuitive search and an intelligent reflective approach to outcomes. Because the projects put strong focus on subconscious notion of form emotions and senses plays an important role as guidance throughout the project. Findings are presented in collection of ten outfits where aesthetic qualities of form are put as a primary factor.Program: Konstnärlig masterutbildning i mode- och textildesign
12
Walters, Kathryn. "Form from flat : Exploring emergent behaviour in woven textiles." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-14893.
Full textAbstract:
The character of woven textiles is dependent on both the materials and the loom technology used. While digitally-controlled jacquard looms are a major development in weaving technology, they have mostly been used in developing representational and pictorial weaving. Such three-dimensional weaving as exists, utilises materials in predictably similar ways. Here, through systematic experimentation, three shrinking and two resisting yarns have been combined in multi-layer weaves in order to explore their potential for form-generating behaviour. Three-dimensional form occurs when the shrinking yarn/s place the resisting yarn/s under tension. To relieve this tension, the resisting yarn moves within the weave, creating waves or folds. The resulting form is highly sensitive to variation, demonstrating emergent behaviour, and identifying the woven textile as a complex system. Demonstrating the variety of form possible from a limited number of materials, the results represent a small body of work aiming to re-form weaving. The exploration of synergistic material combinations is therefore shown to be an exercise of value to fields from art textiles through to industry. It demonstrates that there is great development potential in woven textiles. Understanding the behaviour of materials is fundamental to furthering form-based weaving.
13
Barnett, Jamie Marie. "Do You Read Me? Objects of Language and the Language of Objects." VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd_retro/101.
Full textAbstract:
My project investigates the intersection of typography and furniture. It questions the language of these objects and compares the two, based on an assumption of similarity. Each supports the assertion of the language system of the other.
14
Chakir, El-Alaoui El-Houcine. "Les métriques sous riemanniennes en dimension 3." Rouen, 1996. http://www.theses.fr/1996ROUES055.
Full textAbstract:
Cette thèse est consacrée essentiellement à l'étude des métriques sous-riemanniennes dites de contact en dimension 3. Bien que cette étude soit faite localement, on observe des différences fondamentales avec les métriques riemanniennes. En particulier, les lieux conjugue et cut d'un point p contiennent p dans leur adhérence. Ce travail se divise en deux parties : 1. On montre, dans un premier temps, qu'on peut associer à toute métrique sous-riemannienne de contact formelle une forme normale formelle. Ensuite, dans un deuxième temps, on montre que cette forme normale est actuellement lisse (i. E. C, c) si la métrique l'est. Aussi, cette forme normale permet de définir des invariants associés aux métriques sous-riemanniennes de contact. 2. A l'aide de cette forme normale on prouve que l'application exponentielle d'une métrique sous-riemannienne de contact générique est déterminée par un certain jet fini de la métrique. Et on en déduit une classification générique de ces singularités (i. E. Lieux conjugués).
15
Lu, Jia Wei. "Clustering-based force-directed algorithms for three-dimensional graph visualization." Thesis, University of Macau, 2018. http://umaclib3.umac.mo/record=b3950626.
Full text
16
Planitz, Brigit Maria. "A correspondence framework for surface matching algorithms." Queensland University of Technology, 2004. http://eprints.qut.edu.au/16001/.
Full textAbstract:
Computer vision tasks such as three dimensional (3D) registration, 3D modelling, and 3D object recognition are becoming more and more useful in industry, and have application such as reverse CAD engineering, and robot navigation. Each of these applications use correspondence algorithms as part of their processes. Correspondence algorithms are required to compute accurate mappings between artificial surfaces that represent actual objects or scenes. In industry, inaccurate correspondence is related to factors such as expenses in time and labour, and also safety. Therefore, it is essential to select an appropriate correspondence algorithm for a given surface matching task. However, current research in the area of surface correspondence is hampered by an abundance of applications specific algorithms, and no uniform terminology of consistent model for selecting and/or comparing algorithms. This dissertation presents a correspondence framework for surface matching algorithms. The framework is a conceptual model that is implementable. It is designed to assist in the analysis, comparison, development, and implementation of correspondence algorithms, which are essential tasks when selecting or creating an algorithm for a particular application. The primary contribution of the thesis is the correspondence framework presented as a conceptual model for surface matching algorithms. The model provides a systematic method for analysing, comparing, and developing algorithms. The dissertation demonstrates that by dividing correspondence computation into five stages: region definition, feature extraction, feature representation, local matching, and global matching, the task becomes smaller and more manageable. It also shows that the same stages of different algorithms are directly comparable. Furthermore, novel algorithms can be created by simply connecting compatible stages of different algorithms. Finally, new ideas can be synthesised by creating only the stages to be tested, without developing a while new correspondence algorithm. The secondary contribution that is outlined is the correspondence framework presented as a software design tool for surface matching algorithms. The framework is shown to reduce the complexity of implementing existing algorithms within the framework. This is done by encoding algorithms in a stage-wise procedure, whereby an algorithm is separated into the five stages of the framework. The software design tool is shown to validate the integrity of restructuring existing algorithms within it, and also provide an efficient basis for creating new algorithms. The third contribution that is made is the specification of a quality metric for algorithms comparison. The metric is used to assess the accuracy of the outcomes of a number of correspondence algorithms, which are used to match a wide variety of input surface pairs. The metric is used to demonstrate that each algorithm is application specific, and highlight the types of surfaces that can be matched by each algorithm. Thus, it is shown that algorithms that are implemented within the framework can be selected for particular surface correspondence tasks. The final contribution made is this dissertation is the expansion of the correspondence framework beyond the surface matching domain. The correspondence framework is maintained in its original form, and is used for image matching algorithms. Existing algorithms from three image matching applications are implemented and modified using the framework. It is shown how the framework provides a consistent means and uniform terminology for developing both surface and image matching algorithms. In summary, this thesis presents a correspondence framework for surface matching algorithms. The framework is general, encompassing a comprehensive set of algorithms, and flexible, expanding beyond surface matching to major image matching applications.
17
Pourbakhsh, Seyed Alireza. "Dummy TSV-Based Timing Optimization for 3D On-Chip Memory." Thesis, North Dakota State University, 2016. https://hdl.handle.net/10365/29093.
Full textAbstract:
Design and fabrication of three-dimensional (3D) ICs is one the newest and hottest trends in semiconductor manufacturing industry. In 3D ICs, multiple 2D silicon dies are stacked vertically, and through silicon vias (TSVs) are used to transfer power and signals between different dies. The electrical characteristic of TSVs can be modeled with equivalent circuits consisted of passive elements. In this thesis, we use “dummy” TSVs as electrical delay units in 3D SRAMs. Our results prove that dummy TSVs based delay units are as effective as conventional delay cells in performance, increase the operational frequency of SRAM up to 110%, reduce the usage of silicon area up to 88%, induce negligible power overhead, and improve robustness against voltage supply variation and fluctuation.
18
Deugoue, Gabriel. "Existence of solutions for stochastic Navier-Stokes alpha and Leray alpha models of fluid turbulence and their relations to the stochastic Navier-Stokes equations." Thesis, University of Pretoria, 2010. http://hdl.handle.net/2263/25566.
Full textAbstract:
In this thesis, we investigate the stochastic three dimensional Navier-Stokes-∝ model and the stochastic three dimensional Leray-∝ model which arise in the modelling of turbulent flows of fluids. We prove the existence of probabilistic weak solutions for the stochastic three dimensional Navier-Stokes-∝ model. Our model contains nonlinear forcing terms which do not satisfy the Lipschitz conditions. We also discuss the uniqueness. The proof of the existence combines the Galerkin approximation and the compactness method. We also study the asymptotic behavior of weak solutions to the stochastic three dimensional Navier-Stokes-∝ model as ∝ approaches zero in the case of periodic box. Our result provides a new construction of the weak solutions for the stochastic three dimensional Navier-Stokes equations as approximations by sequences of solutions of the stochastic three dimensional Navier-Stokes-∝ model. Finally, we prove the existence and uniqueness of strong solution to the stochastic three dimensional Leray-∝ equations under appropriate conditions on the data. This is achieved by means of the Galerkin approximation combines with the weak convergence methods. We also study the asymptotic behavior of the strong solution as alpha goes to zero. We show that a sequence of strong solution converges in appropriate topologies to weak solutions of the stochastic three dimensional Navier-Stokes equations. All the results in this thesis are new and extend works done by several leading experts in both deterministic and stochastic models of fluid dynamics.Thesis (PhD)--University of Pretoria, 2010.
Mathematics and Applied Mathematics
unrestricted
19
Poulsen, Carsten. "Development of a positioning system for 3D ultrasound." Link to electronic thesis, 2005. http://www.wpi.edu/Pubs/ETD/Available/etd-101805-180813/.
Full text
20
Mantle, Emma Jane. "An evaluation of 3D building modelling and visualisation packages for enhancing public participation within the planning process." Thesis, University of South Wales, 2007. https://pure.southwales.ac.uk/en/studentthesis/an-evaluation-of-3d-building-modelling-and-visualisation-packages-for-enhancing-public-participation-within-the-planning-process(9e7f4a54-2fde-4723-ada8-17412b5f9efe).html.
Full textAbstract:
This thesis will look at the importance of 3D Visualization within the planning process and addresses the issue of improving public participation within urban regeneration. The main aim of this research is therefore to discover what type of model the public require in terms of understanding future developments, which may in turn help them engage in the planning process. In order to achieve the main aim several other aims need to be established, such as; identifying the capacity of the profession in Wales to deliver 3D models of urban environments, evaluating software solutions to create 3D models of urban environments, and to explore emerging techniques that might contribute to the efficiency and economy of producing models of urban environments. These aims were realised through conducting surveys which targeted the Building Design Profession (BDP) and established which software packages were being used and for what purpose. A second survey was also conducted by means of an exhibition, which aimed to establish what the public require in regards to being presented with proposed developments. Other aims were realized through conducting trials. These examined the usability of different 3D CAD packages and the possibility of integrating CAD data with GIS, and how it could be used to quicken the modeling process. Results from these trials showed that through the use of workarounds there are possibilities of integrating CAD and GIS data. The research reported here indicates that members of the public have trouble understanding 2D Plans and Elevations and the data consistently demonstrates that more than 40% of participants chose 3D technology as a more understandable method of being shown future developments. The results from the two surveys show that although the majority (42.4%) of participants selected 3D technology as their preferred option, only 28% of participating Building Design Professionals in Wales use 3D computer packages, albeit not for presenting propose urban regeneration projects to the public. From the outset of this research the purpose has been to evaluate whether public participation will be increased if 3D technologies are provided to showcase proposed developments. The more efficient the modelling process, the more feasible and likely it will be that 3D CAD will one day be a paramount tool within the Planning Process. Numerous techniques were included to examine this efficiency.
21
Mao, Dun. "A quality assessment approach and a hole-filling method for DIBR virtual view images." Thesis, University of Macau, 2018. http://umaclib3.umac.mo/record=b3950633.
Full text
22
Wan, Sau Kuen. "Modeling with panoramic image network for image-based walkthroughs /." access full-text access abstract and table of contents, 2005. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?mphil-cs-b1988588xa.pdf.
Full textAbstract:
Thesis (M.Phil.)--City University of Hong Kong, 2005."Submitted to Department of Computer Science in partial fulfillment of the requirements for the degree of Master of Philosophy" Includes bibliographical references (leaves 81-84)
23
Sinha, Pawan. "Perceiving and recognizing three-dimensional forms." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11093.
Full text
24
Kim, Kang Suk. "3D visualization of an invariant display strategy for hyperspecteral imagery." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FKim%5FKang%5FSuk.pdf.
Full textAbstract:
Thesis (M.S. in Applied Physics and Computer Science)--Naval Postgraduate School, December 2002.Thesis advisor(s): Richard C. Olsen, Donald P. Brutzman. Includes bibliographical references (p. 85-86). Also available online.
25
Lim, Namkyu. "RUBE-QM a 3D simulation and modeling approach for queuing systems /." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0005360.
Full text
26
Dodd, Thomas G. "Development of a three dimensional terrain display for a light infantry platoon combat model." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA247994.
Full textAbstract:
Thesis (M.S. in Systems Technology (Command, Control, and Communication))--Naval Postgraduate School, June 1990.Thesis Advisor(s): Parry, Samuel H. Second Reader: Hoffman, James C. "June 1990." Description based on signature page as viewed on October 21, 2009. Page 21 is missing and not attainable. DTIC Identifier(s): Combat models. Author(s) subject terms: Three dimensional graphics display, combat model, DYNTACS terrain representation. Includes bibliographical references (p. 134-135). Also available online.
27
Krzewina, Leo G. "Structured light for three-dimensional microscopy." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001515.
Full text
28
Hassaine, Djamel. "Efficient rendering for three-dimensional displays." Thesis, Durham University, 2010. http://etheses.dur.ac.uk/651/.
Full textAbstract:
This thesis explores more efficient methods for visualizing point data sets on three-dimensional (3D) displays. Point data sets are used in many scientific applications, e.g. cosmological simulations. Visualizing these data sets in {3D} is desirable because it can more readily reveal structure and unknown phenomena. However, cutting-edge scientific point data sets are very large and producing/rendering even a single image is expensive. Furthermore, current literature suggests that the ideal number of views for 3D (multiview) displays can be in the hundreds, which compounds the costs. The accepted notion that many views are required for {3D} displays is challenged by carrying out a novel human factor trials study. The results suggest that humans are actually surprisingly insensitive to the number of viewpoints with regard to their task performance, when occlusion in the scene is not a dominant factor. Existing stereoscopic rendering algorithms can have high set-up costs which limits their use and none are tuned for uncorrelated {3D} point rendering. This thesis shows that it is possible to improve rendering speeds for a low number of views by perspective reprojection. The novelty in the approach described lies in delaying the reprojection and generation of the viewpoints until the fragment stage of the pipeline and streamlining the rendering pipeline for points only. Theoretical analysis suggests a fragment reprojection scheme will render at least 2.8 times faster than na\"{i}vely re-rendering the scene from multiple viewpoints. Building upon the fragment reprojection technique, further rendering performance is shown to be possible (at the cost of some rendering accuracy) by restricting the amount of reprojection required according to the stereoscopic resolution of the display. A significant benefit is that the scene depth can be mapped arbitrarily to the perceived depth range of the display at no extra cost than a single region mapping approach. Using an average case-study (rendering from a 500k points for a 9-view High Definition 3D display), theoretical analysis suggests that this new approach is capable of twice the performance gains than simply reprojecting every single fragment, and quantitative measures show the algorithm to be 5 times faster than a naïve rendering approach. Further detailed quantitative results, under varying scenarios, are provided and discussed.
29
Ji, Yunfeng. "Videogrammetric technique for structural dynamic applications /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202007%20JI.
Full text
30
Wang, Haomian. "Visualization techniques for 3D urban environments /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CSED%202009%20WANGH.
Full text
31
Maddison, Christopher Paul. "Transverse flux machines for high torque applications." Thesis, University of Newcastle Upon Tyne, 1999. http://hdl.handle.net/10443/887.
Full textAbstract:
Transverse Flux Machines (TFM) present some interesting problems to the machine designer, electro-magnetically and mechanically. They offer the lure of an extremely high specific output, but only, apparently, at the price of intricate three dimensional flux paths, a complicated construction and a low power factor. The research covered by this thesis was concerned with the study, development and improvement of these machines with a view to reducing the detracting aspects of the marque whilst accentuating its advantages. Extensive three dimensional finite element analysis into a wide range of TFM topologies, was coupled with practical investigations into three prototype TFMs constructed at Newcastle University. The result of this work was an improved TFM topology with comparatively good power factor, a simple single sided geometry and a very high specific output.
32
Wang, Qing. "Protein labels for cellular electron cryo-tomography." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609234.
Full text
33
Berry, David W. "Design, Analysis and Experimental Verification of a Mechanically Compliant Interface for Fabricating Reliable, Double-Side Cooled, High Temperature, Sintered Silver Interconnected Power Modules." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/64898.
Full textAbstract:
This research developed a double-side power electronics packaging scheme for high temperature applications exemplified by 1200 V, 150 A silicon devices. The power modules, based on both quarter and half-bridge topologies, were assembled using sintered silver device attachment rather than conventional solder alloys. Thermomechanical stresses in the double-side architecture were mitigated with a compliant layer fabricated from elliptical silver tubes.
This research presents an introduction to conventional packaging techniques and their weaknesses. These shortcomings provide the basis for a module design which improves upon module thermal management while also addressing electrical and reliability requirements. The optimum package design enhances heat dissipation with the addition of a substrate bonded to the top electrical pads of the semiconductor devices. The use of sintered silver also increases the useful application temperature by avoiding the creep failure mechanisms of solder alloys.
The modules were characterized extensively to quantify thermal and electrical performance. In the case of thermal characterization, the double-side architecture required multiple testing configurations to fully understand the parallel heat flow paths. These results were compared to models constructed using finite element analysis (FEA). The FEA models were also utilized for measurement of strains in multiple package designs to better determine the effects of increased compliance on the relative package cycling lifetime. These lifetimes were then assessed, in part, using experimental passive and cycling tests on functional double-side packages.
The resulting power modules exhibited significant decreases in thermal resistance when they are cooled, as designed, from both sides of the module. Even single sided cooling options reveal significant advantages and transient thermal impedance was found to be significantly lower. Power module models revealed the compliant layer was successful in reducing the device shear stresses which was experimentally validated through the use of DC power stage testing. It was found, through double pulse testing and electrical modeling, that parasitic inductances were reduced by utilizing planar bonding and planar symmetrical traces. Finally, modeling of the double-side package with added tube compliance revealed a decrease in plastic and shear strains when compared to other single and double-side package designs. This reduction directly translates to increased cycling lifetime using well known strain based fatigue models.Ph. D.
34
Leung, Carlos Wai Yin. "Efficient methods for 3D reconstruction from multiple images /." [St. Lucia, Qld.], 2006. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19150.pdf.
Full text
35
Tutar, Mustafa. "Simplified techniques for motion entourage in 3D animation /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1422972.
Full text
36
Backman, Ronald Bruce. "A temporal 3D-registration framework for computer-integrated surgery." University of Western Australia. Dept. of Computer Science, 1999. http://theses.library.uwa.edu.au/adt-WU2003.0012.
Full textAbstract:
Traditionally, volumetric modalities such as CT and MRI have provided static snapshots of anatomy enabling insight into the progression of disease and to the severity of injury. Recently, 3D-registration algorithms, originating in the neurosurgical field, have been used to merge these images resulting in richer visualizations. However, in situations where trauma patients are unable to be moved or are at risk of infection, there have been comparatively few advances. This thesis presents a 3D-registration framework that supports longitudinal study of morphologic changes in surface images of the upper body based on an optical technique - structured light imaging. The framework incorporates soft-tissue deformation modeling to allow coordinate frame determination and specific point tracking required for applications of Computer-Integrated Surgery. The framework is implemented in three stages using a coarse-fine approach that separately addresses the different sources of registration error commonly found in temporal registration applications. The coarse stage defines seven thoracic fiducials that form a rigid body. A special anthropomorphic stand is designed and used to enforce a rigid body assumption. Experimental results show the fiducials to have precision of approximately 2 mm. The medium stage incorporates the novel use of ultraviolet light as a surface registration technique. UV is used to avoid error caused when the projected light stripes interfere with the marker material - a common problem with external landmarks and optical assessment systems. A semi-automatic algorithm for identifying the centre of the fiducials is given and shown to be highly accurate - to within 1 pixel precision compared to the visually assessed centre. The movement of these fiducials is also modelled at the extremes of the respiratory cycle with individual fiducials moving from 5-17 mm. A least-squares algorithm is implemented to bring surfaces together based on their fiducial locations and rigid-body motion. This algorithm results in RMS error of approximately 1.17 +/- 0.45 mm. The fine stage involves finding fixed point correspondences in changed regions between a base surface and a comparison surface acquired at a different time given the rigid body registration from the previous stages. Five algorithmic variants are assessed using two simulations of thoracic swelling. The results do not show statistical significance between variants but do indicate visually some promising results. An application of this framework could be the near real-time guidance of the FAROArm, a precision measuring instrument commonly used in Computer-Integrated Surgery, to these points. This would facilitate the collection of functional information of clinical interest while maintaining positional congruence with data acquired at a different time point.
37
Chen, Yu. "Probabilistic frameworks for single view reconstruction using shape priors." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610217.
Full text
38
Embrey, Leslie. "Three-Dimensional Graphene Foam Reinforced Epoxy Composites." FIU Digital Commons, 2017. http://digitalcommons.fiu.edu/etd/3128.
Full textAbstract:
Three-dimensional graphene foam (3D GrF) is an interconnected, porous structure of graphene sheets with excellent mechanical, electrical and thermal properties, making it a candidate reinforcement for polymer matrices. GrF’s 3D structure eliminates nanoparticle agglomeration and provides seamless pathways for electron travel. The objective of this work is to fabricate low density GrF reinforced epoxy composites with superior mechanical and electrical properties and study the underlying deformation mechanisms. Dip coating and mold casting fabrication methods are employed in order to tailor the microstructure and properties. The composite’s microstructure revealed good interfacial interaction. By adding mere 0.63 wt.% GrF, flexural strength was improved by 56%. The addition of 2 wt.% GrF showed a surge in glass transition temperature (56oC), improvement in damping behavior (150%), and electrical conductivity 11 orders of magnitude higher than pure epoxy. Dip coated and mold casted composites showed a gauge factor of ~2.4 indicating electromechanically robust composite materials.
39
Goltsman, Alexander Mark. "Three Dimensional Interferometric Imaging at Terahertz Frequency for Concealed Object Detection." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/36351.
Full textAbstract:
This project was born out of the work performed by a group of researchers at the New Jersey Institute of Technology (NJIT) [1] [2] [3] working on interferometric imaging with a spiral array. Their investigation stopped at two dimensional imaging with a two dimensional array. In this thesis, their idea was developed further into the significantly more complex imaging with a three dimensional array. The general design of the NJIT [1] [2] [3] experiment was reproduced, studied, and modified in a manner that was theorized to enhance the experiment with the added ability to perform three dimensional imaging. The NJIT team [1] [2] [3] has developed their experiment to where they were able to accurately perform two dimensional imaging of two sources of equal intensity located at different distances from a spiral array. In this thesis, the equations used for two dimensional imaging are extrapolated into a three dimensional array application. This three dimensional imaging concept is simulated with MATLAB and the results presented and compared to the NJIT experimental results. [1] [2] [3] A proof of concept physical experiment is conducted and the results are compared to the MATLAB simulation. The results show that additional spatial information can be obtained from a three dimensional array that can enhance the information gleaned from images.Master of Science
40
Zhu, Jinhao. "Uniquimer 3D, a software system for structural DNA nanotechnology design, analysis and evaluation /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?CSED%202008%20ZHU.
Full text
41
Paleologos, Esther, and esther paleologos@rmit edu au. "An exploration of new processes and products for knitted textiles: this research will explore the combination of standard and non-standard fibres and finishing processes to create three-dimensional and sculptural knitted fabric structures, while expanding the potential of domestic machine knitting to be viewed as an art form." RMIT University. Fashion & Textiles, 2010. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20100329.143129.
Full textAbstract:
Contemporary knitting over the past decade has experienced a recent resurgence in cultural interest and technical exploration. This research project aims to identify, through personal practice, the implications of knitting as undefined, removed from the boundaries of product. It is the dissolving of the lines between design, art and craft and exploring the domestically machine knitted textile via the use of materials and the inherent qualities of the fabric which are the driving factors of this research. It is through this exploration that my personal and creative process is diversified. The traditional connotations of knitting are historical, social and cultural, in particular hand knitting. Childhood memories of mothers and grandmothers knitting out of necessity, for clothing, often evoke feelings of safety, warmth and comfort. This familiarity of the looped stitches and understanding of the knit as garment binds knitting to fashion. Industrial knitting process, as scale of stitch is reduced, begins to remove this familiarity and creates an anonymity of structure and process, for example jersey knits used for t-shirts. This instant recognition for knitting as clothing is part of the design process where-by knitted fabrics work in unison with product. It is this boundary that has defined my professional practice designing for knitwear. This research involves a more experimental and fluid approach to producing the textile, considering the qualities and potential of the structure as something to celebrate in its own form. Designers such as Issey Miyake, Hussein Chalayan and the artist Rosmarie Trockel have been influential in taking fashion concepts into the gallery, often knitted. This movement of making conceptual and political statements, especially in the case of the industrially knitted pieces by Trockel, was a step to question the traditional and feminist perceptions of knitting and using the process as a material to create art. While these exhibitions explored the knitted textile in the form of fashion garment, the importance of diversifying the knitted cloth and displaying conceptual pieces is a major influence on this research. Also the more recent exhibition 'Radical Lace and Subversive Knitting', (Museum of Arts & Design New York 2007), has allowed for a reinvigorated forum for constructed textiles to be viewed as object, new product or purely as spatial explorations of structure. The impact of these ideas has allowed for the consideration of the textile being stripped back further and to remove the instant connot ation of product application. Exploration of materials, knitted structures and the manipulation of fabric without the constraints of identified product is the impetus of this project. The evolution of the outcomes is instrumental to the reactions of fibres, stitch and interplays of positive and negative space, while suggestions of product are accidental and created by the knitted form as it is removed from the machine. A personal interest in exploiting the knitted structures potential to possess transparency and opacity, become sculptural and changeable by hand have influenced the choices of material and stitch combination. This experimentation has informed my personal practice and the involved process of making.
42
Bateman, Kathleen Suzanne. "Three-dimensional virtual environment for spatial development." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1567.
Full textAbstract:
The purpose of this project is to design a computer program to help children
understand a strategy for changing vantage points within an imagined space and gain
knowledge of how spatial transformations work. The developed software, called
Viewpoints, presents a virtual three-dimensional environment to be explored and
modified by the user. Object and camera manipulations are illustrated through
animation. Furthermore, the program was designed to have an intuitive interface and be
easy to access. This should allow the softwares target audience of children to focus on
the spatial orientation and spatial visualization aspects. A small study evaluated the
software in terms of content, instructional design, technical quality, student use, and
instructor use. The study provided valuable feedback on how to improve Viewpoints in
the future. Information gathered suggests the issue of speed should be addressed and
supplemental materials should be added.
43
Lu, Fei, and Yuan Cao. "Three-Dimensional Modeling for Buildings Evacuation Management." Thesis, Högskolan i Gävle, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-12622.
Full textAbstract:
The terrorist attacks on New York City on September 11, 2001 heightened awareness about the need to plan for emergency evacuation measures. As a result, three-Dimensional (3D) city and building models have become an important part of GIS analysis. The technology can be used to plan evacuations in complex indoor environments. This thesis had two main objectives. The first goal was to conduct a 3D network analysis of a building for emergency management, which was based on a 3D model of a building in the city of Gävle, Sweden. This 3D model identifies the shortest path from any room to the defined exit. The second objective was to test the predicted evacuation times with a simulation experiment. The 3D model was built by Google Sketch Pro 8 and the 3D network analysis was mainly conducted in the ESRI’s ArcGIS software. The simulation experiment involved 18 volunteers at the organization Future Position X. The 3D network analysis was based on distance measurements instead of GNSS coordinates. The simulation experiment was conducted in four different situations. Crowding was found to be a critical problem during evacuation. Evacuation speeds varied from normal walking to running. However, crowding always increased the evacuation time and thus would affect the survival rate. Evacuation routes should be distributed differently to reduce this problem. The thesis also identifies other factors to be considered when planning emergency routes and challenges posed by the software at this time.
44
Iarocci, Maria. "Three dimensional graphics tool for motion design." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22741.
Full textAbstract:
This thesis describes the creation of a three dimensional graphics tool that helps a user design, understand and visualize motion of articulated bodies. The linkages that can be considered are closed chains of links or open chains of links having zero to two fixed joints. An open linkage can be viewed as a robot arm, where vertical connecting edges of the linkage are analogous to joints connecting segments of a robot arm. A closed linkage can be viewed as two arms cooperating to move a single point. The visualization tool is an application which animates the linkages moving from an initial to final configuration in three space. The moves permitted by the application are limited to translations, rotations and "line tracking" motions (7). Spherical obstacles may be added to the environment.
45
Munding, Andreas. "Interconnect technology for three-dimensional chip integration." Göttingen Cuvillier, 2007. http://d-nb.info/986311502/04.
Full text
46
Gurumurthy, Ashok. "Simulation methodologies for multiphase three-dimensional microstructures." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52261.
Full textAbstract:
There is a need for simulation methodologies for multiphase three-dimensional microstructures that can be used in numerical simulations of material behavior or in exact computation of effective properties using microstructural correlation functions. Specifically, the methodology must be able to generate verifiably realistic microstructures, with complex morphology accurately represented.
Striving to address that need, the research presented here develops a general microstructure simulation toolbox for multiphase two- and three-dimensional microstructures consisting of one connected phase and one or more particulate phases. Previous work by other researchers has found successful solutions to a variety of special cases of the general problem, but most of them are intended for binary microstructures, and nearly all simulate only two-dimensional microstructures. The toolbox presented here attempts to exceed those limitations.
Its framework is a Metropolis stochastic-optimization routine running a simulated-anneal schedule, with particle position coordinates defining the configuration space and a range of forms available for the ﾓenergyﾔ? function. The toolbox allows several parameterizations of the microstructure, supplying all elementary properties (phase volume fractions, mean sizes, etc.) and some non-elementary properties (distributions of elementary properties, properties relating to inter-phase distances and morphology) of microstructures as possible parameters.
The toolbox is able, as one special case, to simulate realistic microstructures of uniaxially compacted mixtures of elemental Al-Ti-B powders and achieve basic microstructure-processing correlation. Statistical tests involving microstructural correlation functions bear out the realism. The toolbox is also able to generate virtual microstructures for the same system, for use in the design of experiments (which are in fact high-strain-rate impact simulations), and for evaluating hypotheses involving achievable material properties.
The Al-Ti-B powder compacts are potential advanced energetic materials that, when subjected to high-strain-rate impact (which may or may not constitute shock compression), explosively release heat by anaerobic reaction according as certain incompletely understood conditions are met or not. The study of those conditions and the mechanism of reaction initiation (carried out by a collaborator) is the specific application that the simulations in this work cater to.
To ensure realistic morphology in simulated Al-Ti-B microstructures, this work included reconstruction (carried out by montage serial sectioning) of large three-dimensional volumes of Al-Ti and Al-B binary compacts for two sets of powders that yielded actual 3 D Ti and B particle images. Accordingly, advancement of the experimental technique of montage serial sectioning and a quantitative characterization of the real powder microstructures also formed part of this research.
While only examples from Al-Ti-B powders are used throughout this work, it is clear that the methods will apply to other similar systems.
47
Taylor, Ian. "'Dynamic scaling for three-dimensional information visualisation'." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324478.
Full text
48
Faraz, A. "Three dimensional force modelling for milling operations." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381031.
Full text
49
Halle, Michael W. (Michael Wilfred). "Multiple viewpoint rendering for three-dimensional displays." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/29127.
Full text
50
Mughal, Bilal Hafeez. "Integral methods for three-dimensional boundary layers." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9970.
Full text