Geometria Discreta
Mostrando 13-20 de 20 artigos, teses e dissertações.
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13. STATISTICAL OPTIMIZATION OF SPATIAL HIERARCHICAL STRUCTURES SEARCHS / OTIMIZAÇÃO ESTATÍSTICA DE BUSCAS PARA ESTRUTURAS HIERÁRQUICAS ESPACIAIS
This work emerged from the following observation: usual search procedures for 2d-trees start from the root to retrieve the data stored at the leaves. But since the leaves are the farthest nodes to the root, why start from the root? With usual 2d-trees representations, there is no other way to access a leaf. However, there exist 2d-trees which allow accessing
Publicado em: 2008
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14. Discrete Geometry and Codes / Geometria discreta e codigos
The research developed here is related and inspired by problems in coding theory. It is presented in two parts. In the first we focus on the search for the minimum nonvanishing vector of a lattice, specially in the case of a projection of the ndimensional integer lattice in the direction of one of its vectors. This is a problem of high computational complexi
Publicado em: 2007
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15. Discrete Geometry and Codes / Geometria discreta e codigos
The research developed here is related and inspired by problems in coding theory. It is presented in two parts. In the ?rst we focus on the search for the minimum nonvanishing vector of a lattice, specially in the case of a projection of the ndimensional integer lattice in the direction of one of its vectors. This is a problem of high computational complexit
Publicado em: 2007
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16. DISTRIBUIÇÕES E IMERSÕES / DISTRIBUTIONS AND IMMERSIONS
Os desafios de estudar formas levaram matemáticos a criar abstrações, em particular através da geometria diferencial. Porém, formas simples como cubos não se adequam a ferramentas diferenciáveis. Este trabalho é uma tentativa de usar avanços recentes da análise, no caso a teoria das distribuições, para estender quantidades diferenciáveis a objet
Publicado em: 2007
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17. Esqueletos euclidianos discretos em resolução aumentada / Discrete euclidean skeletons in increased resolution
The extraction of Euclidean skeletons is a subject of great importance in the domain of image processing and it has been discussed by the scientific community since more than 20 years.Today it is a consensus that Euclidean skeletons should present the following characteristics: thin, centered, homotopic and reversible, i.e., suficient for the reconstruction
Publicado em: 2006
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18. Spherical codes with cyclic symmetries / Codigos esfericos com simetrias ciclicas
Euclidean spherical codes with symmetries are orbits of finite orthogonal matrix groups. These codes are also known as group codes. ln this work, the commutative group codes in even dimensions are viewed on flat tori, which are submanifolds of the sphere. Also, if the matrix group is cyclic, the generated code lies on a knot which wraps around a torus. If th
Publicado em: 2006
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19. COMPLEXOS DE MORSE DISCRETOS E GEOMÉTRICOS / GEOMETRIC DISCRETE MORSE COMPLEXES
Differential geometry provides an intuitive way of understanding smooth objects in the space. However, with the evolution of geometric modeling by computer, this tool became both necessary and difficult to transpose to the discrete setting. The power of Morse theory relies on the link it created between differential topology and geometry. Starting from a com
Publicado em: 2005
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20. Análise de impacto em vigas usando-se o método de integração explícita no tempo. / Impact analysis of beams using the explicit time integration method.
O problemas do impacto em corpos elásticos está massivamente presente na indústria e no funcionamento de grande parte dos equipamentos domésticos. Entender e dominar este fenômeno é fundamental não somente a indústria mecânica mas a todas as outras que nela se apóiam. Neste trabalho são apresentados estudos básicos sobre impacto longitudinal, tra
Publicado em: 2002