Jacobi Methods
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Damped Jacobi Methods Based on Two Different Matrices for Signal Detection in Massive MIMO Uplink
Abstract For massive multiple-input multiple-output (m-MIMO) uplink, the performances of the linear minimum mean-square error (MMSE) detector are considered near optimal, and they occupy benchmark place for most linear iterative detectors. However, the MMSE algorithm is known by its load computational complexity due to the implication of large-scale matrix i
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-03
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2. Development of radiofrequency ablation device for surgical hepatocellular carcinoma treatment in agreement with Brazilian standards
Abstract Introduction Many studies have been carried out on the main causes of hepatocellular carcinoma (HCC) to identify suitable diagnosis methods and treatments to combat the disease. However, high equipment costs and the lack of hepatic-ablation technologies manufactured in Brazil encourage the design and implementation of a solution based on normative
Res. Biomed. Eng.. Publicado em: 17/05/2018
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3. A New Jacobi-based Iterative Method for the Classical Analysis of Structures
Abstract Traditionally, classical methods of structural analysis such as slope-deflection and moment distribution methods (Cross method) are used for primary analysis of structures and also controlling the results of computer programs. The main objective of this paper is to introduce a new method for classical computing and extending it to a matrix formulati
Lat. Am. j. solids struct.. Publicado em: 2015
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4. Instantonic methods for quantum tunneling in finite size
The instantonic approach for a Φ4 model potential is reexamined in the asymptotic limit. The path integral of the system is derived in semiclassical approximation expanding the action around the classical background. It is shown that the singularity in the path integral, arising from the zero mode in the quantum fluctuation spectrum, can be tackled only ass
Brazilian Journal of Physics. Publicado em: 2009-12
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5. APLICAÇÕES DO MÉTODO TIPO JACOBI QUATERNIÔNICO / QUATERNIONIC JACOBI METHOD APPLICATIONS
O método tipo-Jacobi quaterniônico foi proposto em 1993. Vários estudos provaram sua convergência e melhoram a teoria proposta desde então. O presente trabalho realiza uma síntese do método tipo- Jacobi quaterniônico, apresentando aplicações do mesmo a diferentes tipos de matrizes.
Publicado em: 2008
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6. Tensor-based interpolation functions and integration rules for the high order finite elements methods / Funções de interpolação e regras de integração tensorizaveis para o metodo de elementos finitos de alta ordem
Este trabalho tem por objetivo principal o desenvolvimento de funções de interpolaçao e regras de integraçao tensorizaveis para o Metodo dos Elementos Finitos (MEF) de alta ordem hp, considerando os sistemas de referencias locais dos elementos. Para isso, primeiramente, determinam-se ponderaçoes especficas para as bases de funçoes de triangulos e tetra
Publicado em: 2008
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7. Análise geométrica e dinâmica de modelos de gravidade generalizada / Geometrical and Dynamical Analysis of Generalized Gravity Models
This work aims the investigation of some dynamical aspects of generalized gravity models, namely scalar-tensor and f(R) models. These models intend to solve in a more natural way the problem of the existence of the dark energy, which is supposedly the component of the Universe that causes its accelerated expansion. In a null spatial curvature Friedmann-Lema�
Publicado em: 2008
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8. A novel hybrid optimization algorithm for diferential-algebraic control problems
Dynamic optimization problems can be numerically solved by direct, indirect and Hamilton-Jacobi-Bellman methods. In this paper, the differential-algebraic approach is incorporated into a hybrid method, extending the concepts of structural and differential indexes, consistent initialization analysis, index reduction and dynamic degrees of freedom to the optim
Brazilian Journal of Chemical Engineering. Publicado em: 2007-09
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9. "Implementation of Level Set Method for computing curves and surfaces motion" / "Implementação numérica do método Level Set para propagação de curvas e superfícies"
Nesta dissertação de Mestrado será apresentada uma poderosa técnica numérica, conhecida como método Level Set, capaz de simular e analisar movimentos de curvas em diferentes cenários físicos. Tal método - formulado por Osher e Sethian [1] - está sedimentado na seguinte idéia: representar uma determinada curva (ou superfície) Γ como a curva d
Publicado em: 2004
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10. Modelagem e simulação do processo de oxidação do etanol a acetaldeido
A new high performance catalyst is proposed to oxidize ethanol to acetaldehyde. The available experimental data are analysed using two different reactional mechanisms. After choosing a Temkin type mechanism, the single reaction rate equation to be used in the simulations is determined. Then,a continuous bidimendional steady-state model for the catalytic bed
Publicado em: 1992
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11. Ordered upwind methods for static Hamilton–Jacobi equations
We introduce a family of fast ordered upwind methods for approximating solutions to a wide class of static Hamilton–Jacobi equations with Dirichlet boundary conditions. Standard techniques often rely on iteration to converge to the solution of a discretized version of the partial differential equation. Our fast methods avoid iteration through a carefu
The National Academy of Sciences.
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12. Fast methods for the Eikonal and related Hamilton– Jacobi equations on unstructured meshes
The Fast Marching Method is a numerical algorithm for solving the Eikonal equation on a rectangular orthogonal mesh in O(M log M) steps, where M is the total number of grid points. The scheme relies on an upwind finite difference approximation to the gradient and a resulting causality relationship that lends itself to a Dijkstra-like programming approach. In
The National Academy of Sciences.