Navegando por Autor "MEDEIROS, Adelson Bezerra de"

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Barrido de Frecuencia en Coordenadas de Fase para Sistemas Desequilibrados
(INSTITUTO DE TECNOLOGIA, 2012) CABRAL LEITE, Jandeey; TOSTES, Maria Emilia de Lima; PÉREZ ABRIL, Ignacio; MEDEIROS, Adelson Bezerra de; AZEVEDO, Manoel Socorro Santos; BEZERRA, Ubiratan Holanda; MAGALHÃES, Edilson Marques
The paper develops a phase-coordinates model for analyzing unbalanced electrical networks, enabling the specification of single-phase or three-phase harmonic injections of any sequence. The model is applied to a four-wire delta system, demonstrating its ability to represent structural asymmetries and identify resonances at different frequencies.
Characterization of the Specific Absorption Rate of the Cell Phone in the Human Head, Using the LN-FDTD Method
(INSTITUTO DE TECNOLOGIA, 2015) MEDEIROS, Adelson Bezerra de; LEITE, Jandecy Cabral.; Eduardo de Magalhães Braga
This work investigates the absorption of electromagnetic energy in biological tissues of the human head from cell phones in the 900MHz band, and the development of a program to calculate the Specific Absorption Rate (SAR) in the user's head. The Local Non-Orthogonal Finite-Difference Time Domain (LN-FDTD) method is implemented, using the Uniaxial Perfectly-Matched Layer (UPML), and the results are compared with existing literature. Findings show that SAR values for 1W and 0.6W exceed safety limits set by international agencies, while 0.25W complies with established standards.
Modelo para el análisis de la negociación en los proyectos de sistemas en una fábrica de software basado en puntos de casos de uso
(INSTITUTO DE TECNOLOGIA, 2011) MACIEL, Paulo Henrique de Lima; LEITE, Jandecy Cabral; MEDEIROS, Adelson Bezerra de; Prof Dr. Walter Barra Junior
System modeling is increasingly used in academia to estimate team size, effort, software size, and total project cost. This article proposes a model based on Use Case Points (UCP), supported by techniques such as LOC, COCOMO, and Function Points. The model aims to assist managers in negotiations with clients, improving cost and time estimation. The model proved effective in simulating changes in system requirements and automatically calculating updated estimates.
Otimização Multiobjetivo de Filtros Harmônicos Passivos para Instalações Industriais Usando Técnicas de NSGA-II
(INSTITUTO DE TECNOLOGIA, 2015) LEITE, Jandecy Cabral; ABRIL, Ignacio Perez; AZEVEDO, Manoel Socorro Santos; MEDEIROS, Adelson Bezerra de; NASCIMENTO, Manoel Henrique Reis; VALENZUELA, Walter Andres Vermehren; Prof. Dr. Waldinei Rosa Monteiro.
This paper presents a mathematical method and a computational tool for the selection and sizing of passive harmonic filters in industrial systems using the NSGA-II genetic algorithm. The goal is to maximize the economic benefits of the project, minimize harmonic distortion in the PCC current and bus voltages, and comply with power quality standards (ANEEL and IEEE 519-92). The results demonstrate the method's effectiveness in determining filter parameters, selecting configurations, and addressing multiple operational scenarios.