EMC - Escola de Engenharia Elétrica, Mecânica e de Computação

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http://200.137.215.59//handle/ri/587

A Escola de Engenharia Elétrica, Mecânica e de Computação (EMC), da Universidade Federal de Goiás, oferece Graduação em: Engenharia Elétrica, Engenharia Mecânica e Engenharia da Computação. Além de Especialização em: Telecomunicações; Instalações Elétricas; e, Gestão de Negócios.

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Agora exibindo 1 - 20 de 150

Traffic modeling in PLC networks using a Markov fluid model with autocorrelation function fitting
(2011) Rocha, Flávio Geraldo Coelho; Santos, Christiane Borges; Vieira, Flávio Henrique Teles
In this paper, we present an analysis of VoIP (Voice over IP) traffic and data transfer using PLC (PowerLine Communications) network. We propose a model based on MMFM (Markov Modulated Fluid Models) for data and VoIP traffic in PLC networks. Simulations and comparisons were carried out to verify the efficiency of the proposed traffic model over the Poisson and MMPP (Markov Modulated Poisson Process) models.
Modelagem de tráfego VoIP utilizando misturas gaussianas ajustadas por algoritmo de maximização de esperança e comprimento de descrição mínimo
(2013) Oliveira, Cheila Mendes de; Lucas, Rosana de Paula; Vieira, Flávio Henrique Teles
The increase in the number of applications that generate VoIP (Voiceover IP) traffic requires that suitable models for this kind of traffic be used to bet-ter dimension and predict network resources. In this paper,we propose the applica-tion of Gaussian mixture adjusted by an EM algorithm (Expectation-Maximization)with selection of classes using the principle of Minimum Description Length (MDL-Minimum Description Length) in order to describe VoIP traffic. Real VoIP traces werecollected and synthetic time series were generated according to these data. The propo-sed algorithm is compared to the EM algorithm and the MDL (Minimum DescriptionLength) based algorithm in terms of performance in modelingthe considered VoIPtraffic traces.
Estimação de envelope efetivo de tráfego de redes baseada em modelagem multifractal para controle de admissão de usuários com qualidade de serviço
(2013) Vieira, Flávio Henrique Teles; Lucas, Rosana de Paula; Vieira, Renata Teles
In this paper, first we present an effective bandwidth equation for multifractal traffic based on a multiplicative cascade model. Merging the effective bandwidth to the effective envelope concept from the Statistical Network Calculus, we compute end-to-end performance bounds for real multifractal network traffic. Using these bounds, we propose an admission control scheme that guarantees quality service in terms of data loss probability and delay through the obtained effective envelope for the MWM (Multifractal Wavelet Model) multifractal model. Through simulations, we compare the number of flows admitted using effective service curves corresponding to different types of traffic flow schedulers for the fBm (fractional Brownian motion) andMWM traffic models.
Programa de educação tutorial na Escola de Engenharia Elétrica, Mecânica e de Computação (EMC) da UFG: as dimensões do trabalho e da formação
(Getúlio Antero de Deus Júnior, 2014-12) Deus Júnior, Getúlio Antero de; Chaveiro, Eguimar Felício
This paper investigates how the Programa de Educação Tutorial (PET/CAPES, Tutorial Training Program) relates to both professional training and the job market, based on activities developed by the PET – Engenharias (Conexões de Saberes) group, at the Escola de Engenharia Elétrica, Mecânica e de Computação (EMC), Universidade Federal de Goiás (UFG). Two issues are considered: how may PET activities be transformed, to provide the PET participant with a favourable environment and conditions for a successful career, and likewise for concluding undergraduate studies and going on to graduate school. In that context, a reflection upon both the programs underlying philosophy and the relationship between professional and academic life, is presented. The conclusions of that reflection are discussed together with the results of a survey, specifically developed to collect the experiences within the PET program, from ex and current participants.
A origem do ensino de engenharia em Goiás
(Getúlio Antero de Deus Júnior, 2014-12) Castro, Rosângela Nunes Almeida de
This article presents the findings of a social-historical investigation of engineering education in the state of Goiás. The initial groundwork is laid out in a discussion of (a) the relationship between Man and Technique, and (b) the introduction of an education based on cultural transmission. The article goes on to describe the history of the first Engineering Schools in Europe, United States and in Brazil, particularly in the state of Goiás. Then, by reconstructing the historical events leading to the foundation of the Escola de Engenharia do Brasil Central, the article arrives at a discussion of the foundation of the Escola de Engenharia of the Universidade Federal de Goiás (UFG), initially offering the course of Civil Engineering.
A teoria da prática: a aula de engenharia
(Getúlio Antero de Deus Júnior, 2015-06) Castro, Rosângela Nunes Almeida de
The objective of this text is to present some ideas and re ections on engineering education arising from the world and society changes occurring during the Information Age. Some engineering education issues and professor teaching styles are presented. We start by considering the relationships between an engineering education and the professor's role in the classroom. Then, we present some ideas regarding engineering education, point out alternative forms of teaching engineering.
Grupo Clown - engenheiros sem fronteiras (conexões de saberes): construindo uma formação humanística nos cursos de engenharia por meio da arte, cultura e conexões de saberes
(Getúlio Antero de Deus Júnior, 2015-12) Gomes, Analice Silva; Silva Filho, Antônio Marcelino da; Andrade, Bruno Henrique Castro de; Silva, Carlos Leandro Borges da; Silva Júnior, Cleidson César da; Lopes Filho, Gilberto; Leitão, João Luiz Andrade; Kunzler, Jonas Augusto; Dias, Laura Vitória Rezende; Paula, Marcelo Vinícius de; Santos, Maria Luisa Matias dos; Cherubin, Ricardo; Melo, Thaís Borges de; Deus Júnior, Getúlio Antero de
The Grupo Clown - Engenheiros Sem Fronteiras (Conex~oes de Saberes) is a group of clowns made up of Engineers and students of Engineering courses. Cultural performances are held in conventional and unconventional spaces without worrying about the setting. However, there are concerns regarding the costumes of clowns and the use of musical instruments. The theoretical basis of clown groups dates back to the origins of Poor Theatre, Jerzy Grotowski (1933-1999). To integrate the use of music, theater and dance to present and promote the enjoyment of art, the clown group values the interaction with the audience without assigning great importance to conventional elements of theater, such as backdrop, stage and lighting. In this way, the clown group rewards its members by providing development of their communication skills, contact with the community surrounding the Universidade Federal de Goi as (UFG) and also the satisfaction of disseminating art in a simple and effective way. Therefore, the clown group promotes a humanistic education while contributing to the improvement of communication skills of its members. In the ve years of the group's creation, fourteen presentations were performed, including a show with a nation-wide audience.
Um método para o diagnóstico das habilidades gerenciais de egressos em engenharia como subsídio ao aperfeiçoamento de projetos pedagógicos no escopo da gestão: um estudo de caso
(Getúlio Antero de Deus Júnior, 2015-12) Cordeiro, Amanda Martins; Fleury, Nélio Benedito; Guedes, Leonardo Guerra de Rezende
This paper proposes a diagnosis of maturity in management (present and required) for the exercise of management functions, typical supervision and management of engineering companies from the evaluation of technical management skills, personal and administrative professionals and identi cation the degree of stimulation and productivity present in speci c working environments of enterprises. This proposal aims to generate diagnostic information guiding the improvement of pedagogical projects of engineering courses, speci cally regarding the formation of the engineer to management in its area of operation. The de nition (i) the skills of managers, (ii) the actions that characterize these skills and (iii) what and how much of these actions are necessary and essential to motivate or optimize a team, given a certain workplace, and establishes parameters and consequently a \parameter estimation" of shares that determine the degree of technical management skills, personal and administrative. Soon we can establish the speci c pedagogical actions that develop the individual skills of each student to success in engineering management.
Uma nova abordagem de ensino para a disciplina de introdução a engenharia de computação
(Getúlio Antero de Deus Júnior, 2016-06) Hoffmann, Ana Gabriella Freitas; Silva, Bruna Michelly de Oliveira; Santana, Adriano César
The continual improvement of the teaching methods employed with Engineering curricula presents singular challenges. This paper describes our work in developing a new approach to the Introduction to Computer Engineering course, using after-class practical lab work sessions. Expected results include both increased familiarity with practical work and senior-freshman mindset of collaboration. A pleasant atmosphere, ripe for developing creative thinking and teamwork is brought about, throughout a series of constructive activities, employing Arduino's c⃝ and LEGOR ⃝ MindstormsR ⃝ . These activities are designed and supervised by student monitors, under the purview of the course professor.
A relevância da “disciplina desenho técnico" para a formação do engenheiro de produção
(Getúlio Antero de Deus Júnior, 2016-06) Ferreira, Juliana Pires; Emílio, Aurea Caroline Gonçalves
The course \Technical Drawing" is of unquestionable importance to Production Engineers. This work shows how the course interferers in academic and professional life of the undergraduate student, in their training and in the development and understanding of projects. It is possible to note during this research that the Technical Drawing acts enhancing learning, and corroborate the formation of a good professional. This is evidenced by the fact that the majority of the investigated students con rmed the importance of the Technical Drawing for Production Engineering.
Produção de recursos multimeios: uso de metodologias ativas na formação textual e visual de engenheiros
(Getúlio Antero de Deus Júnior, 2017-06) Deus Júnior, Getúlio Antero de; Alves, Ricardo Henrique Fonseca; Castro, Marcelo Stehling de; Lemos, Rodrigo Pinto
The paper presents the experiences gained during the learning process of the Free Elective, Production of Multimedia Resources (PRM), o ered by the Department of Electrical, Mechanical and Computer Engineering (EMC) of the Federal University of Goias (UFG). It was presented the activities and the evaluation of the modules of the course PRM that uses the active learning met- hods Problem-Based Learning (PBL) and Project-Led Education (PLE). It was also presented the results of a survey realized after a technical visit in the exhibition Densi cation and expansion: contemporary art collection CCUFG as a closing activity of the Module Introduction to textual and visual communication. The results show the positive and negative impacts of some works of art, what is very common in this kind of art. In addition, it was showed a favorable acceptance of the exhibition by the students (an average of 7.6, on a scale from 0 to 10). Thus, the results show that the exhibition contributed to the visual formation of the students.
Desenvolvimento de método para fabricação de ferramentas de microusinagem
(Universidade Federal de Goiás, 2018-11-23) Tavares, Vitor Renan Pires; Cunha, Daniel Fernandes da; Cunha, Daniel Fernandes da; Ferreira Filho, Demóstenes; Albuquerque, Fillipe Mendonça
This work is a task created for the production of tools for micro milling the reuse of samples of micro mills that were used and discarded by the method of non-conventional machining of Electro-erosion. The conventional milling of EDM, the milling process and the micro milling process. The main objectives are also to reuse / recycle, develop and research non-conventional machining areas and micro machining through the manufacture of a micro mill with reuse of samples and use of tools in research and research. micro-machining, thus contributing to the scientific development of both parties. It was also used a methodology for the use of cutting tools by the method of Electroerosion, such as the parameters used and the criteria for their selection. It briefly and briefly explained the steps and results found, and the results obtained. The production of micro mill and use the same at the same microbial processing. The first step was done from a listing, and a search continues through new studies to optimize the results found.
Análise de faturas de energia elétrica da Universidade Federal de Goiás com vistas à otimização de custos associados a este insumo
(Universidade Federal de Goiás, 2018-11-30) Ferreira, Leonardo da Cruz; Ferreira, Lorena Ediluna; Belchior, Fernando Nunes; Belchior, Fernando Nunes; Oliveira, Antônio Melo de; Castro, Marcelo Stehling
Conserve the financial balance of a company turns into a challenge for any managemen mainly in economic crises which decrease the company incomes. Besides the increase of essential inputs, a electric energy, the challenge gets worse, when the actual energy supply contracts do not offer to consumer the option to choose their providers. In cases as universities, the right to contract energy supply decreases cost and can be used for institution benefit. The knowledge that can simplify management of resources are importan to reduce costs and relieve risks in a decision, mainly with highly consumers. The objective for this project i show the methodology for contract energy supply context (even in the free energy market, as regulated energ market), optimizing the best contracts for Federal University of Goias.
Clown group - engineers without borders (knowledge connections): building a humanistic training in engineering courses
(Getúlio Antero de Deus Júnior, 2018-12) Alves, Ricardo Henrique Fonseca; Deus Júnior, Getúlio Antero de; Kunzler, Jonas Augusto; Silva Filho, Antônio Marcelino da
The Clown Group Engineers without Borders (Knowledge Connections) is a group of clowns formed by Engineers and Engineering students. The theoretical basis of the Clown Group goes back to the origins of Jerzy Grotowski's poor theater (1933 1999). Concerning the use of music, theater and dance to present and promote the pleasure of art, the Group values the interaction with the public and does not worry about the structural elements commonly characterized by the theater as stage and lighting. In this way, the Clown Group promotes a Humanistic Formation of its members by providing a development in the capacity of communication, contact with the external community and also the satisfaction, by allowing the art to be spread in a simple and e ective way. The objective of this work is to analyze the importance of Humanistic Training in the professional and personal development of Engineers and Engineering students, treating as a special case the Humanistic Training linked to the actions of the Clown Group Engineers without Bor- ders (Knowledge Connections). As a hypothesis, it is expected that the experience of members and ex members of the Clown Group can be proven through their training and presentations over the years. In order to evaluate the personal and professional development of members and ex members of the Clown Group during the training process, a qualitative research was carried out, via an applied questionnaire, in addition to a documentary research by observation, in which data were collected through analysis and observation of photos and documents of the Clown Group. In ad- dition, Arti cial Neural Networks were used to correlate the members and ex members based on the two applied researches. The members and ex members of the Clown Group have experienced a major break in introspection, signi cantly improving their way of communicating with society. The members and ex members presented an improvement in the way they relate to each other in a team, a fundamental aspect of an Engineer's professional life. The Clown Group presents itself as a very important action for Humanistic Training and the professional and personal development of Engineers and Engineering students. The di usion of art in the academic and external community promoted by the Clown Group also allows the deconstruction of the stereotype that the areas of Engineering and the Arts cannot coexist.
Projeto de uma usina fotovoltaica e sua viabilidade econômica
(Universidade Federal de Goiás, 2018-12-07) Hoepers, Gean Rodrigo Warsneski; Oliveira, Iury Amâncio; Santos, Euler Bueno dos; Santos, Euler Bueno dos; Valle, Ana Cláudia Marques do; Marra, Enes Gonçalves
This paper presents relevant concepts in the area of Electrical Engineering, reporting on the use of solar power plants as a complementary energy source to the Brazilian energy matrix. The constantdrop in the price of photovoltaic materials together with the great availability of solar resources in Brazil makes the solar source interesting alternative. Therefore, this study presents the necessary requirements for the design and project of photovoltaic systems that comply current standards. In addition, an economic viability study and its relevant financial indicators are also discussed. Using the necessary concepts, it is presented the development of the solar energy project to attend to a particular specific and its own study of economic feasibility, showing how investment in the solar economy is feasible.
Transmissão de imagens utilizando a tecnologia F-OFDM
(Universidade Federal de Goiás, 2018-12-10) Silva, Leonardo Lucas de Assis; Rocha, Flávio Geraldo Coelho; Rocha, Flávio Geraldo Coelho; Vieira, Flávio Henrique Teles; Lemos, Rodrigo Pinto
This work aims to address and evaluate the performance of data transmission of an image using the Orthogonal Frequency Division Multiplexing (OFDM) technology compared to the Filtered Orthogonal Frequency Division Multiplexing (F-OFDM) technology. The F-OFDM is a candidate technology to be used in the new generation of wireless mobile communication, the 5G. In 5G, there is the prospect that high-speed services and availability will be offered to users, such as: low-latency in mobile Internet, telemedicine, communication among devices such as machines and vehicles (D2D - Device to Device) and paradigm of the Internet of Things (IoT - Internet of Things). F-OFDM retains the advantages of OFDM and reduces important disadvantages by using a filter design that smoothes truncation at the ends of its subbands, reducing OOBE (Out Of Band Emission). In this work we also explore how the preparation for the transmission of an image through an OFDM tecnology based network takes place and how it is retrieved at its destination. Finally, simulation results of the transmission of an image through the channels of an OFDM and F-OFDM network are presented and the transmission and reception processes are evaluated using the following performance parameters: BER (Bit Error Ratio), PAPR (Peak to-Average Power Ratio), Power Spectral Density (PSD) analysis in passing bandwidth, impact changes in filter design, and a simplified way of verifying extra band emission (OOBE).
Análise da influência do pré-aquecimento, gás de proteção e tecimento na diluição e dureza de revestimento de inconel 625 ao substrato de aço carbono por processo MIG/MAG
(Universidade Federal de Goiás, 2018-12-10) Speziali, Lucas Moura; Ferreira Filho, Demostenes; Ferreira Filho, Demostenes; Figueiredo, Kleber Mendes de; Gonçalves Júnior, José Lúcio
Welding coating is an increasingly used method for the manufacture of wear and corrosion resistant parts, since it allows the manufacture of parts with lower cost materials, applying more noble materials to the surface to achieve the desired properties. The present work deals with the influence of the variation of three parameters on the coating of a Nickel alloy (Inconel 625) by MIG / MAG welding on a carbon steel substrate, varying the protection gas and the preheating temperature, with the purpose of determining the most suitable parameter to perform the coating process in function of not having high dilution of the weld bead in the substrate, concurring in significant losses in the hardness of the coating material. Welding is also contemplated with the weaving technique, in order to assess whether or not the use of weaving is advantageous for the process. The main results were increased dilution for use of the fabric, increase of the preheating temperature, and larger amounts of active gas in the protection gas. For welding with Ar + 25% He also increased the dilution for higher preheating temperatures. With increasing dilution, for higher temperatures and active gas there was reduction in hardness. The weave had no clear behavior with respect to the hardness of the coating.
Gestão de energia em unidades hospitalares: estudo de caso do hospital das clinicas da Universidade Federal de Goiás - parte 2
(Universidade Federal de Goiás, 2018-12-12) Maciel, Stephanny Lima; Valle, Ana Cláudia Marques do; Hamberger, Paula Andréia do Valle; Valle, Ana Cláudia Marques do; Cavalcante, Hugo Rafael Gonçalves
Projeto de um microaerogerador de ímãs permanentes
(Universidade Federal de Goiás, 2018-12-13) Duarte, Denner Cezar; Martins, François de Souza; Paula, Geyverson Teixeira de; Paula, Geyverson Teixeira de; Dias, Renato Jayme; Kopcak, Igor
This following work deals with the design and construction of a Permanent Magnet AC brushless micro-aerogenerator, based on a preexisting induction motor stator, designed to meet the demands of small rural installations in the region of Goiás. Using the finite element method, it was possible to obtain generator performance predictions based on the main parameters that could be changed such as the number of turns, the type of winding, the diameter of the enameled copper wire used in the coils, dimensions and materials of the rotor, the quantity, composition, geometry and energy product of the magnets and other parameter which will be discussed throughout this document. The comparison between the practical results of the tests performed on the generator and the simulations generated by the software proved to be satisfactory. The generator is capable of producing three-phase sine waves that have high fidelity to the ideal, obtaining a R2 = 0.9989 when comparing a voltage cycle of the generator with a sine function, in addition to a spectrum of harmonics where the most expressive (2nd and 3rd harmonic) represent, respectively, 2% and 1.7% of the fundamental amplitude, demonstrating the quality of the final product. In the load tests a satisfactory voltage regulation was obtained with a low voltage drop (see Table 5). Due to the high number of poles, in the process of rectifying the current it was possible to minimize the ripple using a low capacitance in the circuit, this implies a low investment in capacitor banks to make available the generated energy to the network. The cost of the machine, combined with the reuse of parts, provided a low cost, totaling R $ 204.00 at the end of its construction. The cost of the machine, combined with the reuse of parts, provided a low cost, totaling R $ 204.00 at the end of its construction.
Estudo para o gerenciamento de projeto e dimensionamento de elevadores
(Universidade Federal de Goiás, 2018-12-14) Santos, Guilherme Gomes dos; Silva, Hédipo José Ribeiro e; Valle, Ana Cláudia Marques do; Valle, Ana Cláudia Marques do; Hamberger, Paula Andréa do Valle; Costa, Jônatas Siqueira
This paper aims at structural and components analysis suitable for deployment of a variety of elevator environments. The study is mainly focused on specific mechanical and electrical functions for elevator installation, as well as a brief comment on the use of modern control modules with permanent magnet or induction high performance machines, LED lighting, intelligent software and regenerative braking. In this paper, the basic operating principles of the motors used in the elevators and techniques for the sizing according to the norms in force in Brazil are indicated, being NM207, NM196, NBR 14712 and NBR 8400.

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