Algebraic Algorithms
Mostrando 1-12 de 30 artigos, teses e dissertações.
-
1. Comparison and Combination of Techniques for Determining the Parameters of a Magnetic Hysteresis Model
Abstract The Jiles-Atherton scalar hysteresis model presents five parameters used to represent the material tested and used to calculate the magnetic losses. This article presents a comparative analysis of the performance of two methods of identifying these parameters. In the first method, the equations of Jiles-Atherton were assembled into a single non-line
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 12/09/2019
-
2. OPTIMIZATION OF A PULTRUSION PROCESS USING FINITE DIFFERENCE AND PARTICLE SWARM ALGORITHMS
AbstractPultrusion is one of several manufacturing processes for reinforced polymer composites. In this process fibers are continuously pulled through a resin bath and, after impregnation, the fiber-resin assembly is cured in a heated forming die. In order to obtain a polymeric composite with good properties (high and uniform degree of cure) and a process wi
Braz. J. Chem. Eng.. Publicado em: 2015-06
-
3. Optimizing similarity queries in metric spaces meeting user\ s expectation / Otimização de operações de busca por similaridade em espaços métricos
The complexity of data stored in large databases has increased at very fast paces. Hence, operations more elaborated than traditional queries are essential in order to extract all required information from the database. Therefore, the interest of the database community in similarity search has increased significantly. Two of the well-known types of similarit
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/10/2012
-
4. Ferramentas algÃbricas para o estudo do entrelaÃamento quÃntico / Algebraic tools for the study of quantum entanglement
Esta tese apresenta alguns resultados sobre dois temas importantes para a teoria da informaÃÃo quÃntica: entrelaÃamento quÃntico e algoritmos quÃnticos Com respeito ao entrelaÃamento à estabelecida uma relaÃÃo entre a negatividade e os menores principais de matrizes Hermitianas o que permite analisar o entrelaÃamento para estados de dois qubits e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/03/2012
-
5. Diferenciação automática de matrizes Hessianas / Automatic differentiation of hessian matrices
In the context of nonlinear programming, many algorithms boil down to the application of Newton s method to the system constituted by the first order Lagrangian conditions. The calculation of Hessian matrices is necessary in this class of solvers. Our focus is on the exact calculation, within machine precision, of Hessian matrices through automatic different
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/04/2011
-
6. Parametrização e otimização de criptografia de curvas elípticas amigáveis a emparelhamentos. / Parameterization and optmization of pairing-friendly elliptic curves.
A tendência para o futuro da tecnologia é a produção de dispositivos eletrônicos e de computação cada vez menores. Em curto e médio prazos, ainda há poucos recursos de memória e processamento neste ambiente. A longo prazo, conforme a Física, a Química e a Microeletrônica se desenvolvem, constata-se significativo aumento na capacidade de tais dis
Publicado em: 2011
-
7. Algoritmos algebricos para enumerar e isolar zeros polinomiais complexos / Algebraic algorithms for enumerate and isolate complex polynomial zeros
O presente trabalho trata do problema de isolar zeros de polinômios complexos. Muitos algoritmos calculam zeros polinomiais, a partir de regiões iniciais disjuntas, cada uma contendo um único zero. Entretanto o problema de obter tais regiões ainda e alvo de estudo, uma vez que as soluções propostas ainda não são satisfatórias. A obtenção de regiõ
Publicado em: 2010
-
8. Interger fatorization and groups on conics / Fatoração de inteiros e grupos sobre conicas
The objective of this paper is to factorize integer number using rational points on the unitary circle. Also, it intends to determinate some groups on the conics. The research begins with the basic concepts of Algebra and Number Theory ensuring that the rational points set on the unitary circle has a structure of group. From this set is possible to extend th
Publicado em: 2009
-
9. Mathematical Modeling and Numeriacal Methods for Simulation of the Heat Conduction in Liquid Helium / Modelagem Matemática e Métodos Numéricos para Simulação da Condução do Calor no Hélio Líquido
The element helium, found mainly in natural gas reserves, condenses at temperature of 4.2K, and is the unique known substance that remains in liquid to absolute zero. In the liquid phase, the helium presents still another phase change in 2.19K, where passes of common liquid to superfluous liquid, with almost zero viscosity. These properties give the helium i
Publicado em: 2009
-
10. Algebraic formulation for modeling hop-by-hop multi-constrained routing algorithms. / Formulação algébrica para a modelagem de algoritmos de roteamento multi-restritivo hop-by-hop.
This work presents a new mathematical structure for paths algebra that allows the convergence analysis of hop-by-hop multi-constrained routing algorithms and, under the traffic engineering and quality of service perspectives in the Generalized Multiprotocol Label Switching (GMPLS) architecture, trustily ensures the aggregation of new routing metrics in a con
Publicado em: 2008
-
11. Comparação algebrica de genomas : o caso da distancia de reversão / Algebraic genome comparison : the case of reversal distance
In the last decades we have seen a great progress in molecular biology. That lead to a large volume of data on molecules, DNA and proteins, essential for life.The current stage of research lies in the pursuit of tools to extract information with biological relevance from this data. In this context, comparison of genomes is an important tool and genome rearra
Publicado em: 2007
-
12. Algoritmo preditivo baseado em modelo aplicado ao controle de velocidade do motor de indução / Speed control of induction motor using predictive algorithm
This thesis presents the results concerning the control of rotor flux and speed of the induction motor using MBPC strategy, which is based on the error minimization between the future set point and model prediction, resulting in control signals. In the case studied in this thesis the motor model is described in space-state. The non linear MBPC emploies searc
Publicado em: 2007