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25 results on '"Amorim, Ronan"'

1. Geo-Sketcher: Rapid 3D Geological Modeling using Geological and Topographic Map Sketches

Author

Amorim, Ronan, Brazil, Emilio Vital, Samavati, Faramarz, and Sousa, Mario Costa

Subjects
Computer Science - Graphics, Computer Science - Computational Geometry
Abstract

The construction of 3D geological models is an essential task in oil/gas exploration, development and production. However, it is a cumbersome, time-consuming and error-prone task mainly because of the model's geometric and topological complexity. The models construction is usually separated into interpretation and 3D modeling, performed by different highly specialized individuals, which leads to inconsistencies and intensifies the challenges. In addition, the creation of models following geological rules is paramount for properly depicting static and dynamic properties of oil/gas reservoirs. In this work, we propose a sketch-based approach to expedite the creation of valid 3D geological models by mimicking how domain experts interpret geological structures, allowing creating models directly from interpretation sketches. Our sketch-based modeler (Geo-Sketcher) is based on sketches of standard 2D topographic and geological maps, comprised of lines, symbols and annotations. We developed a graph-based representation to enable (1) the automatic computation of the relative ages of rock series and layers, and (2) the embedding of specific geological rules directly in the sketching. We introduce the use of Hermite-Birkhoff Radial Basis Functions to interpolate the geological map constraints, and demonstrate the capabilities of our approach with a variety of results with different levels of complexity., Comment: 21 pages, 30 Figures

Published
2023

3. 3D Heart Modeling with Cellular Automata, Mass-Spring System and CUDA

Author

Campos, Ricardo Silva, Amorim, Ronan Mendonça, de Oliveira, Bernardo Lino, Rocha, Bernardo Martins, Sundnes, Joakim, da Silva Barra, Luis Paulo, Lobosco, Marcelo, dos Santos, Rodrigo Weber, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, and Malyshkin, Victor, editor

Published
2013
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4. An Electro-Mechanical Cardiac Simulator Based on Cellular Automata and Mass-Spring Models

Author

Amorim, Ronan Mendonça, Campos, Ricardo Silva, Lobosco, Marcelo, Jacob, Christian, dos Santos, Rodrigo Weber, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Sirakoulis, Georgios Ch., editor, and Bandini, Stefania, editor

Published
2012
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5. Comparing CUDA, OpenCL and OpenGL Implementations of the Cardiac Monodomain Equations

Author

Sachetto Oliveira, Rafael, Rocha, Bernardo Martins, Amorim, Ronan Mendonça, Campos, Fernando Otaviano, Meira, Wagner, Jr., Toledo, Elson Magalhães, dos Santos, Rodrigo Weber, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Wyrzykowski, Roman, editor, Dongarra, Jack, editor, Karczewski, Konrad, editor, and Waśniewski, Jerzy, editor

Published
2012
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6. Performance Evaluation of a Reservoir Simulator on a Multi-core Cluster

Author

Xavier, Carolina Ribeiro, dos Santos Amorim, Elisa Portes, Amorim, Ronan M., Lobosco, Marcelo, Goldfeld, Paulo, Dickstein, Flavio, dos Santos, Rodrigo Weber, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Taniar, David, editor, Gervasi, Osvaldo, editor, Murgante, Beniamino, editor, Pardede, Eric, editor, and Apduhan, Bernady O., editor

Published
2010
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7. A Transformation Tool for ODE Based Models

Author

Barbosa, Ciro B., dos Santos, Rodrigo W., Amorim, Ronan M., Ciuffo, Leandro N., Manfroi, Fairus, Oliveira, Rafael S., Campos, Fernando O., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Alexandrov, Vassil N., editor, van Albada, Geert Dick, editor, Sloot, Peter M. A., editor, and Dongarra, Jack, editor

Published
2006
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12. Introduction to convex analysis: convex sets and functions

Author

Amorim, Ronan Gomes de, Cruz, José Yunier Bello, Sandoval, Wilfredo Sosa, and Pérez, Luis Román Lucambio

Subjects
Convexity, Convex functions, Funções convexas, Convexidade, Conjuntos convexos, Convex sets, MATEMATICA APLICADA [MATEMATICA]
Abstract

Neste trabalho, apresentamos as principais ideias concernentes aos conjuntos convexos e às funções convexas. Nosso principal foco é tratar, de forma didática, os principais tópicos envolvidos na convexidade, bem como a consequente exploração dos conceitos matemáticos envolvidos. Nesse sentido, realizamos uma revisão bibliográfica que contemplou teoremas, lemas, corolários e proposições relevantes a um primeiro leitor e a todos que pretendem trabalhar com as aplicações decorrentes da convexidade. Assim, esperamos que este material constitua uma importante fonte de pesquisa a estudantes, professores e pesquisadores que almejem estudar conteúdos relacionados aos conjuntos convexos. This paper presents the main ideas concerning convex sets and functions. Our aim is to deal, didactically, with the main topics concerning convexity, as well as the consequent exploitation of the envolved mathematical concepts. In this sense, we have made a bibliographic revision approaching important theorems, lemmas, corollaries and propositions designed both to first readers and to those who want to work with applications arising from convexity. We hope that this study may constitute an important research source either for students, teachers or researchers who wish to learn more about convex sets. Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES

Published
2013

13. Solução das equações do bidomínio em processadores gráficos

Author

Amorim, Ronan Mendonça, Santos, Rodrigo Weber dos, Meira Júnior, Wagner, Duczmal, Denise Burgarelli, and Dantas, Sócrates de Oliveira

Subjects
Modelos matemáticos, Simulação de sistemas, Título, Engenharia biomédica, CIENCIAS EXATAS E DA TERRA [CNPQ]
Abstract

FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais A modelagem computacional do coração tem se mostrado uma ferramenta de destaque da bioinformática funcional. Os modelos, cada vez mais realistas, oferecem uma melhor compreensão dos complexos fenômenos biofísicos associados à atividade elétrica do coração, como por exemplo, das arritmias cardíacas. Ao mesmo tempo, a complexidade crescente dos modelos tem gerado grandes desafios para a computação de alto desempenho. Este trabalho apresenta de forma inédita um simulador do coração baseado nas Equações do Bidomínio que explora a arquitetura vetorial das unidades de processamento gráfico (GPU) de uso geral. Os resultados iniciais são bastante promissores. O uso da GPU acelerou a execução do simulador cardíaco em aproximadamente 6 vezes se comparado ao melhor desempenho obtido em um processador de uso geral (CPU). The computational modelling of the heart has shown to be a very useful tool in the functional bioinformatics field. The models, becoming more realistic each day, provide a better understanding of the complex biophysical processes related to the electrical activity in the heart as in the case of cardiac arrhythmias. However, the increasing complexity of the models challenges high performance computing in many aspects. This work presents a cardiac simulator based on the bidomain equations that exploits the vectorial architecture of the graphics processing units (GPU). The initial results are promising. The use of the GPU has accelerated the cardiac simulator in about 6 times compared to the best performance obtained in a general purpose processor (CPU).

Published
2009

17. Concurrency and Computation: Practice and Experience / Accelerating cardiac excitation spread simulations using graphics processing units

Author

Rocha, Bernado M., Rocha, Bernado M., Campos, Fernando, Amorim, Ronan, Plank, Gernot, Weber dos Santos, Rodrigo, Liebmann, Manfred, Haase, Gundolf, Rocha, Bernado M., Rocha, Bernado M., Campos, Fernando, Amorim, Ronan, Plank, Gernot, Weber dos Santos, Rodrigo, Liebmann, Manfred, and Haase, Gundolf

Abstract

The modeling of the electrical activity of the heart is of great medical and scientific interest, because it provides a way to get a better understanding of the related biophysical phenomena, allows the development of new techniques for diagnoses and serves as a platform for drug tests. The cardiac electrophysiology may be simulated by solving a partial differential equation coupled to a system of ordinary differential equations describing the electrical behavior of the cell membrane. The numerical solution is, however, computationally demanding because of the fine temporal and spatial sampling required. The demand for real-time high definition 3D graphics made the new graphic processing units (GPUs) a highly parallel, multithreaded, many-core processor with tremendous computational horsepower. It makes the use of GPUs a promising alternative to simulate the electrical activity in the heart. The aim of this work is to study the performance of GPUs for solving the equations underlying the electrical activity in a simple cardiac tissue. In tests on 2D cardiac tissues with different cell models it is shown that the GPU implementation runs 20 times faster than a parallel CPU implementation running with 4 threads on a quad–core machine, parts of the code are even accelerated by a factor of 180.

Published
2010
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21. A Transformation Tool for ODE Based Models.

Author

Alexandrov, Vassil N., Albada, Geert Dick, Sloot, Peter M. A., Dongarra, Jack, Barbosa, Ciro B., Santos, Rodrigo W., Amorim, Ronan M., Ciuffo, Leandro N., Manfroi, Fairus, Oliveira, Rafael S., and Campos, Fernando O.

Abstract

This paper presents a tool for prototyping ODE (Ordinary Differential Equations) based systems in the area of computational modeling. The models, tailored during the project step of the system development, are recorded in MathML, a markup language built upon XML. This design choice improves interoperability with other tools used for mathematical modeling, mainly considering that it is based on Web architecture. The resulting work is a Web portal that transforms an ODE model documented in MathML to a C++ API that offers numerical solutions for that model. [ABSTRACT FROM AUTHOR]

Published
2006
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25. Automatic code generation for solvers of cardiac cellular membrane dynamics in GPUs.

Author

Amorim RM, Rocha BM, Campos FO, and Dos Santos RW

Subjects
Algorithms, Animals, Automation, Computer Simulation, Electrophysiology methods, Gap Junctions pathology, Heart Ventricles pathology, Ions, Markov Chains, Mice, Software, Computer Graphics, Heart physiology, Myocardium cytology, Myocytes, Cardiac cytology, Signal Processing, Computer-Assisted
Abstract

The modeling of the electrical activity of the heart is of great medical and scientific interest, as it provides a way to get a better understanding of the related biophysical phenomena, allows the development of new techniques for diagnoses and serves as a platform for drug tests. However, due to the multi-scale nature of the underlying processes, the simulations of the cardiac bioelectric activity are still a computational challenge. In addition to that, the implementation of these computer models is a time consuming and error prone process. In this work we present a tool for prototyping ordinary differential equations (ODEs) in the area of cardiac modeling that aim to provide the automatic generation of high performance solvers tailored to the new hardware architecture of the graphic processing units (GPUs). The performance of these automatic solvers was evaluated using four different cardiac myocyte models. The GPU version of the solvers were between 75 and 290 times faster than the CPU versions.

Published
2010
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