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Geração e refinamento de malhas segmentadas a partir de imagens com textura; Generating and refining segmented meshes from textured images

Lizier, Mario Augusto de Souza
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 23/11/2009 Português
Relevância na Pesquisa
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Com a popularização de equipamentos tradicionais de captura de imagens, como câmeras digitais, e o avanço tecnológico dos dispositivos não invasivos, como tomografia e ressonância, cresce também a necessidade e consequente uso de métodos numéricos para simulação de fenômenos físicos em domínios definidos por imagens. Um dos pré-requisitos para a aplicação de tais métodos numéricos consiste na discretização do domínio em questão, num processo denominado geração de malhas. Embora diversos métodos de geração de malha tenham sido propostos para discretizar domínios definidos por primitivas geométricas, pouco tem sido feito no sentido de gerar uma decomposição diretamente a partir de imagens. Neste trabalho, apresentamos uma abordagem de geração de malhas de qualidade a partir de domínios definidos por imagens com textura. Mais especificamente, a pesquisa descrita nesta tese contribui com a melhoria do algoritmo Imesh, ao sanar três de suas principais limitações: tratamento de imagens com texturas; controle do nível de refinamento da malha e suporte a outros tipos de elementos. Estas contribuições flexibilizam o processo de geração da malha, e ainda ampliam o domínio de aplicações do algoritmo Imesh...

Object detection and recognition for robotic applications; Deteção e reconhecimento de objetos para aplicações robóticas

Aleixo, Patrícia Nunes
Fonte: Universidade de Aveiro Publicador: Universidade de Aveiro
Tipo: Dissertação de Mestrado
Português
Relevância na Pesquisa
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The computer vision assumes an important relevance in the development of robotic applications. In several applications, robots need to use vision to detect objects, a challenging and sometimes difficult task. This thesis is focused on the study and development of algorithms to be used in detection and identification of objects on digital images to be applied on robots that will be used in practice cases. Three problems are addressed: Detection and identification of decorative stones for textile industry; Detection of the ball in robotic soccer; Detection of objects in a service robot, that operates in a domestic environment. In each case, different methods are studied and applied, such as, Template Matching, Hough transform and visual descriptors (like SIFT and SURF). It was chosen the OpenCv library in order to use the data structures to image manipulation, as well as other structures for all information generated by the developed vision systems. Whenever possible, it was used the implementation of the described methods and have been developed new approaches, both in terms of pre-processing algorithms and in terms of modification of the source code in some used functions. Regarding the pre-processing algorithms, were used the Canny edge detector...

Development of bi-layer mineralized bone and cartilage regeneration template

Ott, Cassandra Holzgartner
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 94 leaves; 7061413 bytes; 7065297 bytes; application/pdf; application/pdf
Português
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Porous collagen-glycosaminoglycan (CG) scaffolds have been studied extensively and proven to be capable of tissue regeneration in vivo for applications including skin regeneration templates, hollow nerve guides and conjunctiva regeneration. While the current CG scaffold has been thoroughly examined both mechanically and clinically, it has yet to prove appropriate for load- bearing applications. This study will investigate the mechanical properties of a mineralized CG scaffold and its application potential in a load-bearing environment. Through the introduction of calcium-phosphate mineral into the standard CG formulation the matrix analog will be available for bone regeneration. Utilizing a patented triple co-precipitation technique developed at Massachusetts Institute of Technology and Cambridge University, a homogeneous mineralized scaffold will be manufactured. Comparison to healthy trabecular bone as well as the selection of the most appropriate extracellular matrix analog will be presented. The key to commercial success is the introduction of a bi-layer bone and cartilage regeneration template to address concerns and difficulties in cartilage repair today. This dual combination is termed a layered osteochondral scaffold.; (cont.) The commercial viability of this product as well as the company founded on its inception...

Synthesis, Modification, and Applications of Template Prepared Porous Alumina Membranes

Hardy, William C
Fonte: University of Florida; University of Florida ( [Gainesville, Fla.] ) Publicador: University of Florida; University of Florida ( [Gainesville, Fla.] )
Tipo: Artigo de Revista Científica Formato: 1 online resource (8 p.)
Publicado em //2014 Português
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In the series University of Florida Digital Collections.; Includes vita.; (Bibliography) Includes bibliographical references.; (Source of Description) Description based on online resource; title from PDF title page.; (Source of Description) This bibliographic record is available under the Creative Commons CC0 public domain dedication. The University of Florida Libraries, as creator of this bibliographic record, has waived all rights to it worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.; (Statement of Responsibility) by William C Hardy.; (Thesis) Thesis (Ph.D.)--University of Florida, 2014.; (Local) Adviser: MARTIN,CHARLES R.; (Local) Co-adviser: SMITH,BEN W.; (Electronic Access) RESTRICTED TO UF STUDENTS, STAFF, FACULTY, AND ON-CAMPUS USE UNTIL 2016-05-31

Artificial biomineralisation and metallic soaps

Corkery, Robert
Fonte: Universidade Nacional da Austrália Publicador: Universidade Nacional da Austrália
Tipo: Thesis (PhD); Doctor of Philosophy (PhD)
Português
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In this thesis, geometry is used as a basis for conducting experiments aimed at growing and arranging inorganic minerals on curved interfaces. Mineralisation is directed using crystalline and liquid-crystalline metallic soaps and surfactant/water systems as templates.¶ A review of the history, syntheses, structure and liquid crystallinity of metallic soaps and other amphiphiles is presented as a foundation to understanding the interfacial architectures in mesostructured template systems in general. ...; yes

Low-mass X-ray binary studies with XMM-Newton

Mück, Benjamin
Fonte: Universität Tübingen Publicador: Universität Tübingen
Tipo: Dissertação
Português
Relevância na Pesquisa
27.229507%
The work presented in this thesis addresses both observational and instrumentation aspects to the study of low-mass X-ray binaries. The analysis of the low-mass X-ray binary system 4U 1735−44, observed by the X-ray satellites BeppoSAX and XMM-Newton, is discussed. For the first time, the broad-band spectrum of the source was investigated which could be modeled by an absorbed combination of a disk blackbody and Comptonization components. The primary focus of the study is set on the fluorescence iron Kα line spectral feature. This line is an important issue since, in the community, it is still debated whether such an iron line can be affected by the relativistic effects which occurs close to a compact object. These effects would result in a broad and asymmetric shape of the line. However, there are also discussions that the shape of the line can be distorted by the occurrence of pile-up and only seems to be relativistic. In this work it is shown that for 4U 1735−44, the line can be modeled either with a broad Gaussian line or with a relativistic line for which the production site is not close to the neutron star. However, even if pile-up effects are carefully taken into account, no distortion of the line due to pile-up was found. The results obtained by the fit of the broad-band spectrum and the detailed study of the iron line led to the suggestion of a possible geometry of the source...

PhD Thesis LaTeX template 2008

Radosavljevic, Predrag
Fonte: Universidade Rice Publicador: Universidade Rice
Português
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This item contains a set of template latex files for the PhD thesis at Rice University.

Rice University Thesis Template for Word 2007

Carey, Brent
Fonte: Universidade Rice Publicador: Universidade Rice
Português
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This thesis template is intended to take much of the headache out of writing a successfully-formatted thesis in accordance with the Rice University Graduate and Postdoctoral Studies instructions for thesis formatting.

Interfacial Assembly of Nanoparticles with Soft Templates for Photovoltaic Applications

Chao, Kung-Po
Fonte: Universidade Rice Publicador: Universidade Rice
Português
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Controlling the assembly of nanoparticles into well-defined functional systems remains a challenge. The main difficulty is that the majority of bulk nanoparticle processing methods result in nanoparticle aggregation and phase separation. In this thesis, we describe a soft-templating strategy to direct the assembly of semiconducting cadmium selenide (CdSe) tetrapods (TPs) into a wire-like and network structure and their application in heterojunction photovoltaic devices. In particular, the templating occurs at the air/water interface and transferred to a substrate via the Langmuir-Blodgett (LB) technique. First we show how a small amphiphilic molecule, such as 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) lipids, can serve as a soft template to control the arrangement of CdSe TPs at the air/water interface. CdSe TPs aggregate into uncontrolled disc-like structures when deposited onto the air/water interface; however, with the presence of POPC, wire-like structures are observed upon compression. Larger templating agents, such as the conjugated polymer, poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), was also shown to be able to template CdSe TPs. This conjugated polymer is of particular interest because of its relatively stability at the air/water interface and its application in organic solar cells. We also discovered a mixed solvent technique...

Testing template and testing concept of operations for speaker authentication technology

Sipko, Marek M.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Tese de Doutorado
Português
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27.16195%
This thesis documents the findings of developing a generic testing template and supporting concept of operations for speaker verification technology as part of the Iraqi Enrollment via Voice Authentication Project (IEVAP). The IEVAP is an Office of the Secretary of Defense sponsored research project commissioned to study the feasibility of speaker verification technology in support of the Global War on Terrorism security requirements. The intent of this project is to contribute toward the future employment of speech technologies in a variety of coalition military operations by developing a pilot proof-of-concept system that integrates speaker verification and automated speech recognition technology into a mobile platform to enhance warfighting capabilities. In this phase of the IEVAP, NPS developed a generic testing template and supporting concept of operations for speaker authentication technology. The intent of this project was to contribute toward the future employment of speech technologies in a variety of coalition military operations by developing a testing template along with a concept of operations to conduct such testing.

Particle Identification in Jets and High-Multiplicity pp Events with the ALICE TPC

Heß, Benjamin Andreas
Fonte: Universität Tübingen Publicador: Universität Tübingen
Tipo: Dissertation; info:eu-repo/semantics/doctoralThesis
Português
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The spectra of identified particles in a collision experiment comprise crucial information about the underlying physical processes. The ALICE experiment has powerful Particle IDentification (PID) capabilities, which are unique at the Large Hadron Collider (LHC). In this thesis, a statistical PID method based on the specific energy loss dE/dx in the ALICE Time Projection Chamber (TPC) is developed: the TPC Multi-Template Fit (MTF). The MTF allows for the extraction of identified charged particle spectra in a wide momentum range, which extends from about 150 MeV/c to above 20 GeV/c. The TPC PID requires a detailed modelling of the TPC dE/dx response for momenta above 2-3 GeV/c. A framework is developed that allows for the determination of the model parameters and for evaluating the PID information of charged particles. With the MTF, the transverse momentum (pT) spectra of charged pions, kaons and protons at mid-rapidity (|eta| < 0.9) are measured for pp collisions at sqrt(s) = 7TeV. It is studied how these spectra and the corresponding K/pi and p/pi ratios evolve as a function of the event multiplicity. The study is motivated by the recent observation that high-multiplicity pp collisions exhibit intriguing similarities to p–Pb and Pb–Pb collisions. For instance...

Building an object model of a legacy simulation

Larimer, Larry R
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Português
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26.873423%
Approved for public release; distribution is unlimited; The Department of Defense proclamation that all simulations comply with High Level Architecture (HLA) standards prompted the U.S. Army Training and Doctrine Command (TRADOC) Analysis Center (TRAC) to investigate the feasibility of including Janus in future HLA Federations. Janus, one of the Army's most extensively used models, is an stochastic high-resolution simulation. As a procedural legacy model coded prior to the rise of object-oriented programming, there are considerable challenges for Janus to meet HLA requirements. This thesis proposes a methodology to produce a HLA Simulation Object Model (SOM) for procedurally implemented legacy simulations. The result obtained by using this methodology is a general object model and one or more SOMs. The general object model provides a full object-oriented template of the legacy simulation that is unrestricted by the model's code or the minimum requirement for interoperability. The SOM is derived from the general object model. This research indicates that procedural legacy simulations can comply with the HLA SOM requirement. In order to achieve this compliance, it is advantageous to first develop the general object model. Additionally...

A joint campaign analysis approach to antisubmarine warfare using a circulation model template

Feustel, Richard D.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Tese de Doutorado Formato: xiii, 1 v. (various pagings): ill.
Português
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Approved for public release; distribution is unlimited; To enhance insight into a war at sea, a general, aggregated and highly flexible model of the ASW campaign is offered. This thesis provides a simple and usable circulation model template. The generality and simplicity of the model allows for 'jointization' of an ASW campaign by allowing the user to utilize other resources to define the force mix. The model is designed, first and foremost, to examine the change in the marginal effectiveness of friendly ASW forces due to changes in force level, mix, effectiveness, and employment strategies. The model is keyed to the interaction of a threat submarine with friendly ASW forces and merchant or military shipping. Specific features of the model provide for four unique attack regimes. The in port and operational regimes control friendly attacks on a daily basis while the outbound and inbound regimes control barriers by events. The campaign model is a deliverable product programmed using Borland(registered) Delphi for use in Microsoft Windows.; http://archive.org/details/jointcampaignana00feus; Lieutenant, United States Navy

Immobilization and Catheter Guidance for Breast Brachytherapy Using Patient-Specific Templates

POMPEU-ROBINSON, ALEXANDRA
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado
Português
Relevância na Pesquisa
27.409258%
Brachytherapy is an important method of breast cancer treatment; however, improvements in both treatment planning and delivery are needed. The procedure involves insertion of catheters in the tumor site, which, in current practice, is prone to clinically significant error. In order to improve on contemporary catheter placement accuracy, integration of pre-operative imaging, supplemented by computerized surgical planning and mathematical optimization were used to develop and test an intra-operative immobilization and catheter guidance system. A custom-template specific to each patient with optimally-placed guide-holes for catheter insertion was designed and fabricated for use on phantom studies. Template creation is based on a virtual reality reconstruction of the patient's anatomy from computed tomography imaging. The template fits on the patient's breast, immobilizing the soft tissue, to provide pre-planned catheter insertion holes for guidance to the tumor site. Agar-based phantom and target models were used for quantitative validation of the template using computed tomography imaging for template planning and validation. Planned catheter tracks were compared to post-insertion image data and distance measurements from target location were used to create an error measure. Using the latest template design spanning multiple experiments resulted in a mean of 2.6 mm...

Computer-Assisted Mosaic Arthroplasty: A Femur Model Trial

Sebastyan, Stephen
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado
Português
Relevância na Pesquisa
27.39563%
Computer assisted mosaic arthroplasty (CAMA) is a surgical technique that transplants cylindrical osteochondral grafts to repair damaged cartilage. An earlier in vivo study on sheep showed that short-term clinical outcomes are improved with the use of computer assistance, as compared to the conventional technique. This thesis reports on a study comparing three mosaic arthroplasty techniques -- one conventional and two computer assisted -- on human anatomy. This in vitro study used solid foam femur models modified to incorporate simulated cartilage defects. There were five participating surgeons ranging from a third year resident to a senior orthopedic surgeon. Each of the five participating surgeons performed a total of nine trials. There were three distinct sets of identical solid foam femur models with simulated cartilage defects. Three surgical techniques (conventional, opto-electronic, and patient-specific template) were performed on each. Several measures were made to compare surgical techniques: operative time; surface congruency; defect coverage; graft surface area either too high or too low; air volume below the grafts; and distance and angle of the grafts from the surgical plan. The patient-specific template and opto-electronic techniques resulted in improved surface congruency...

Sub-20nm substrate patterning using a self-assembled nanocrystal template

Tabone, Ryan C
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 110 p.; 4030579 bytes; 4035167 bytes; application/pdf; application/pdf
Português
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26.873423%
A hexagonally close-packed monolayer of lead selenide quantum dots is presented as a template for patterning with a tunable resolution from 2 to 20nm. Spin-casting and micro-contact printing are resolved as methods of forming and depositing these monolayers of quantum dots through self-assembly. Four methods of templated patterning - shadowmasking, lift-off, selective ablation & nano-imprinting - using the quantum dot self-assembled monolayer are proposed and explored. The nano-imprinting technique is used to produce the smallest pattern in anodized alumina to date. The use of this nano-patterned anodized alumina as an etch mask is discussed as a means of patterning substrates within the 2 to 20nm range. The physics behind the possible modification of silicon's electronic band gap due to our nano-patterning is also presented.; by Ryan C. Tabone.; Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.; Includes bibliographical references (p. 105-110).

Statistical inference for template-based protein structure prediction

Peng, Jian
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 19/06/2013 Português
Relevância na Pesquisa
27.236409%
Protein structure prediction is one of the most important problems in computational biology. The most successful computational approach, also called template-based modeling, identifies templates with solved crystal structures for the query proteins and constructs three dimensional models based on sequence/structure alignments. Although substantial effort has been made to improve protein sequence alignment, the accuracy of alignments between distantly related proteins is still unsatisfactory. In this thesis, I will introduce a number of statistical machine learning methods to build accurate alignments between a protein sequence and its template structures, especially for proteins having only distantly related templates. For a protein with only one good template, we develop a regression-tree based Conditional Random Fields (CRF) model for pairwise protein sequence/structure alignment. By learning a nonlinear threading scoring function, we are able to leverage the correlation among different sequence and structural features. We also introduce an information-theoretic measure to guide the learning algorithm to better exploit the structural features for low-homology proteins with little evolutionary information in their sequence profile. For a protein with multiple good templates...

Optimization of template selection for signal detection systems with additive internal noise

Xue, Shan
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Tese de Doutorado
Português
Relevância na Pesquisa
27.39563%
According to studies done by M. I. Trifonov, the form of the optimal detection template for an observer model with additive internal noise depends not only on the signal to be detected, but also on the internal-external noise ratio. The optimal detection template described by Trifonov's theory indeed exhibited superior performance over the conventional "matched filter" template, but the mathematical procedure Trifonov proposed for proving his theory was insufficient. During the course of this thesis project, an extensive research was carried out to study Trifonov's theory and its implications. As a result of this research, a new mathematical technique was developed to fully prove Trifonov's theory. My contributions presented in this thesis also include the extension of the study to two dimensional signals and the Monte Carlo simulation experiments which were conducted to verify the mathematical theory. The experiment results were found to be in agreement with Trifonov's theory.

Anglo-American relations in Saudi Arabia, 1941-1945: a study of a trying relationship

Hinds, Matthew
Fonte: London School of Economics and Political Science Thesis Publicador: London School of Economics and Political Science Thesis
Tipo: Thesis; NonPeerReviewed Formato: application/pdf
Publicado em /07/2012 Português
Relevância na Pesquisa
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This thesis offers a fresh interpretation of Anglo-American relations in the Kingdom of Saudi Arabia during the period 1941 to 1945. Historians of Anglo-American relations have characterized the bilateral relationship as one of rivalry and polarization. While examples of underlying national competition can be identified wherever the wartime alliance operated, whether on the battlefield or at the conference table, the commonalities which united the allies should, however, be given equal weight. My thesis departs from the traditional historiographical perspective, arguing that when closely examined, the allies were very aware of the strategic reciprocal benefits that would emanate from integrating their policies in Saudi Arabia. First and foremost, Britain and the United States’ relations in Saudi Arabia were shaped by the fact that the two countries were allies working side by side in the global struggle that was the Second World War. In this wartime context, the strategic influence of Saudi Arabia has tended to be overlooked. The Kingdom’s influence resided in its geographic location, its religious centrality within Islam, and most importantly, its rare political status as a sovereign Arab state. These attributes served as a unifying force for British and American wartime interests...

China’s oil diplomacy: comparing Chinese economic statecraft in Angola and Brazil

Alves, Ana Cristina
Fonte: London School of Economics and Political Science Thesis Publicador: London School of Economics and Political Science Thesis
Tipo: Thesis; NonPeerReviewed Formato: application/pdf
Publicado em /06/2011 Português
Relevância na Pesquisa
27.014873%
This thesis aims to investigate the reasons for the variation in China’s oil diplomacy performance in Africa and South America in the period 2000-2010. Lacking sound experience in pursuing oil security overseas and enjoying strong financial muscle, China’s oil diplomacy is largely rooted in the extension of soft loans for infrastructure to oil-rich countries in exchange for steady oil supply and favoured access to oil acreage. Taking Angola and Brazil as case studies this thesis argues that differences in the institutional structure of the oil industry in each country, determined different outcomes regarding Beijing’s oil security goals. This thesis has found that although this template fitted well with the more centralised institutional environment in Angola, it was highly unsuitable for the more liberal and regulated Brazil setting. Furthermore, the advent of the recent global economic crisis (2008-2009) caused China to adjust its approach to the institutional particulars of Brazil becoming more efficient in that country regarding its oil security goals. Building on foreign policy analysis tools and concepts, an empirical analysis of the interplay between Chinese infrastructure-for-oil loans (hereby regarded as positive economic statecraft) and the institutional structure it met in each country...