Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-02-09T22:01:23Z No. of bitstreams: 1 ErnanoArraisJunior_TESE.pdf: 2358354 bytes, checksum: fe5eabcdace20f4bc0d035be4b15e067 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-02-10T18:46:36Z (GMT) No. of bitstreams: 1 ErnanoArraisJunior_TESE.pdf: 2358354 bytes, checksum: fe5eabcdace20f4bc0d035be4b15e067 (MD5) / Made available in DSpace on 2017-02-10T18:46:36Z (GMT). No. of bitstreams: 1 ErnanoArraisJunior_TESE.pdf: 2358354 bytes, checksum: fe5eabcdace20f4bc0d035be4b15e067 (MD5) Previous issue date: 2016-08-26 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Os problemas cardiovasculares est?o entre as principais causas de mortandade no mundo. Estima-se que cerca de 15 % da popula??o mundial vem a ?bito devido a problemas cardiovasculares. No Brasil esse n?mero equivale a quase 30 % dos casos de morte, sendo os homens os mais afetados por doen?as cardiovasculares, apresentando um percentual de aproximadamente 60 % das v?timas. Outro fator alarmante, ? que o Brasil est? entre os 10 pa?ses com maior ?ndice de morte por doen?as cardiovasculares. Os problemas cardiovasculares s?o oriundos do mal funcionamento do cora??o e das art?rias, sendo os mais comuns o infarto, o acidente vascular cerebral (AVC), arritmias card?acas e isquemias. Assim, se faz necess?rio um bom acompanhamento das atividades card?acas, a fim de evitar poss?veis transtornos oriundos de problemas cardiovasculares. Nos ?ltimos anos, diversas solu??es no ?mbito da telecardiologia v?m sendo discutidas para a redu??o destes n?meros, al?m de propor um melhor acompanhamento de indiv?duos (pacientes) e aux?lio ?s unidades b?sicas de sa?de localizadas distantes dos grandes centros. Neste trabalho, ser? apresentado um sistema para an?lise de sinais de eletrocardiograma (ECG) aplicado ? telecardiologia, objetivando a valida??o de dados cl?nicos cardiol?gicos, especificamente arritmias card?acas (bradicardia, taquicardia e contra??o ventricular prematura). A ferramenta matem?tica utilizada para an?lise dos sinais ECG ? a Transformada Wavelet Discreta Redundante (TWDR), sendo implementada uma vers?o para an?lise em tempo-real, e o m?todo utilizado para a aferi??o das caracter?sticas ? o m?todo baseado em thresholds. Ent?o, de posse deste sistema de caracteriza??o do sinal ECG, pode-se validar laudos cl?nicos cardiol?gicos, ou melhor, trata-se de uma ferramenta para aux?lio na valida??o de diagn?sticos m?dicos. Os resultados encontrados foram satisfat?rios, o sistema apresentou Sensibilidade e Preditividade Positiva Superiores a 99 %. Ser? apresentado tamb?m um estudo acerca das ferramentas wavelets que s?o mais indicadas no tratamento de sinais de eletrocardiograma. / Cardiovascular problems are among the leading causes of mortality in the World. It is estimated that about 15 % of the world population has died due to cardiovascular problems. In Brazil this number represents almost 30 % of deaths, being the men the most affected by cardiovascular disease, with a percentage of approximately 60 % of the victims. Another alarming factor is that Brazil is among the 10 countries with the highest rate of death from cardiovascular disease. Cardiovascular diseases arise from malfunction of the heart and arteries, the most common are infarction, stroke, cardiac arrhythmias and ischemia. Thus, if a good monitoring cardiac activity is necessary in order to prevent possible inconvenience arising from cardiovascular disorders. In recent years, several solutions in the framework of Telecardiology have been discussed to reduce these numbers, in addition to proposing a better monitoring of individuals (patients) and aid to basic health care units located far from major centers. In this work, It is proposed a system will for ECG signal analysis applied to Telecardiology, aiming to validate cardiological clinical data, specifically cardiac arrhythmias (bradycardia, tachycardia and premature ventricular contraction). The mathematical tool used for analyzing ECG signals is Redundant Discrete Wavelet Transform (RDWT), implemented a version for real-time analysis, and the method used for measuring the ECG characteristics is the method based on thresholds. Then, with this ECG signal characterization system it can validate cardiological clinical reports, or rather, it is a tool to support of medical diagnostics validation. The results were satisfactory, the system showed Sensitivity and Positive Predictivity above 99 %. It will be presented also a study about mothers wavelet that are more appropriate in ECG signals processing.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-02-13T19:22:38Z No. of bitstreams: 1 LeandroRochinkCosta_DISSERT.pdf: 1175831 bytes, checksum: 3fb21392f141799634d3dbee38317729 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-02-14T18:08:27Z (GMT) No. of bitstreams: 1 LeandroRochinkCosta_DISSERT.pdf: 1175831 bytes, checksum: 3fb21392f141799634d3dbee38317729 (MD5) / Made available in DSpace on 2017-02-14T18:08:27Z (GMT). No. of bitstreams: 1 LeandroRochinkCosta_DISSERT.pdf: 1175831 bytes, checksum: 3fb21392f141799634d3dbee38317729 (MD5) Previous issue date: 2016-08-22 / Ap?s v?rios avan?os na tecnologia de capta??o e armazenamento de dados e do crescimento de aplica??es que prov?m novas informa??es, o n?mero de elementos informacionais dispon?veis ? enorme tanto em volume quanto em variedade. Com esse aumento na quantidade de informa??es, a necessidade de entend?-los e resumi-los se tornou cada vez mais urgente. O Agrupamento Balanceado de Dados, do ingl?s Balanced Clustering, visa encontrar grupos de entidades similares que possuam aproximadamente o mesmo tamanho. Neste trabalho, ? proposta uma nova abordagem heur?stica baseada na metaheur?stica Busca em Vizinhan?a Vari?vel, do ingl?s Variable Neighborhood Search (VNS), e na metodologia Menos ? mais, do ingl?s Less is more approach, para o problema de agrupamento de dados usando o crit?rio da soma m?nima das dist?ncias quadr?ticas com restri??o de balanceamento dos grupos. Os algoritmos encontrados na literatura n?o s?o escal?veis ao passo que aumentamos o tamanho do problema para al?m de 5000 elementos de acordo com experimentos realizados nesta pesquisa. Os experimentos computacionais mostram que o m?todo proposto supera o atual estado da arte neste problema. / After advances in collecting and storing data and the growth in applications that provide new information, the number of data elements available is huge in both volume and variety. With this increase in the quantity of information, the need to understand them and summarize them has become increasingly urgent. The Balanced Clustering seeks to find groups of similar entities that have approximately the same size. In this dissertation, we propose a new heuristic approach based on metaheuristic Variable Neighborhood Search (VNS) and methodology "Less is More Approach"(LIMA) to data clustering problem using the criterion of the minimum sum-of-squared distances applying balancing restriction for the groups. The algorithms found in the literature are not scalable, while the problem of increased size in addition to elements 5000 in accordance with experiments performed in this study. The computational experiments show that the proposed method outperforms the current state of the art for the problem.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-02-17T19:02:33Z No. of bitstreams: 1 AlmirSouzaESilvaNeto_TESE.pdf: 7594512 bytes, checksum: e73e4bac15af98e3446fb9a14895033b (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-02-17T21:29:12Z (GMT) No. of bitstreams: 1 AlmirSouzaESilvaNeto_TESE.pdf: 7594512 bytes, checksum: e73e4bac15af98e3446fb9a14895033b (MD5) / Made available in DSpace on 2017-02-17T21:29:12Z (GMT). No. of bitstreams: 1 AlmirSouzaESilvaNeto_TESE.pdf: 7594512 bytes, checksum: e73e4bac15af98e3446fb9a14895033b (MD5) Previous issue date: 2016-08-22 / Nos dias atuais observa-se um grande avan?o na ?rea aeroespacial, em sistema de telemetria, sensoriamento remoto, sistemas de radar (rastreamento e monitora??o), sistemas de comunica??es via sat?lite e novas tecnologias de comunica??es de voz e dados. As antenas de microfita cada vez mais t?m sido utilizadas devido as suas caracter?sticas e vantagens. Dessa forma, este trabalho apresenta an?lises, simula??es e medi??es de antenas de microfitas para aplica??o em: redes locais sem fio WLAN (Wireless Local Area Network) com opera??o em 2,4 GHz; tecnologia de quarta gera??o 4G para o uso em 2,5 GHz; tecnologia de quinta gera??o 5G nas frequ?ncias de 28 GHz e 60 GHz; aplica??es em UWB (Ultra Wide Band) com bandas de rejei??o utilizando ressoadores de anel partido; sat?lites com opera??o na banda Ku e aplica??o em telemetria utilizando estruturas cil?ndricas operando na faixa de 2 a 4 GHz, na banda S. Foram feitas an?lises com aplica??o de estrutura EBG (Electromagnetic Band Gap) no substrato e no plano de terra, utiliza??o de substrato metamaterial, aplica??o de estruturas DGS (Defected Ground Strutures) no plano de terra e arranjos, com objetivo de obter melhoria nos par?metros, em especial ganho e largura de banda. O m?todo de an?lise das antenas de microfita utilizado neste trabalho foi o m?todo de Linha de Transmiss?o Transversa. Os resultados simulados foram obtidos atrav?s do software comercial Ansoft HFSS. Compara??es entre os resultados simulados e medidos das antenas propostas foram realizados para efeito de valida??o dos prot?tipos. Ao final, s?o apresentadas sugest?es para a continuidade deste trabalho. / Nowadays there has been a major breakthrough in aerospace, in telemetry system, remote sensing, radar systems (tracking and monitoring), satellite communications systems and new technologies for voice and data communications. The microstrip antennas have increasingly been used due to their characteristics and advantages. Thus, this work presents analysis, simulations and measurements of microstrip antenna for use in: wireless local area networks WLAN (Wireless Local Area Network) with operation at 2.4 GHz; fourth generation 4G technology for use in 2.5 GHz; fifth-generation technology 5G at frequencies of 28 GHz and 60 GHz; applications in UWB (Ultra Wide Band) with rejection bands using resonators party ring; satellites operating in the Ku band and application in telemetry using cylindrical structures operating at 2 to 4 GHz band, the S band. Analysis were made with application of EBG structure (Electromagnetic Band Gap) on substrate and in the ground plane, using substrate metamaterial, application DGS structures (Defected Ground Structures) in the ground plane and arrangements, in order to achieve improvement in the parameters, in particular gain and bandwidth. The method of analysis of microstrip antennas used in this work was the Transverse Transmission Line method. The simulated results were obtained by Ansoft HFSS commercial software. Comparisons between simulated and measured results of the antennas proposals were made for effect of validation of the prototypes. Suggestions are made for the continuity of this work.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-02-17T19:02:33Z No. of bitstreams: 1 JoaoTeixeiraDeCarvalhoNeto_TESE.pdf: 8174076 bytes, checksum: abcf3b6d3686c5b762d15c468555b83d (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-02-17T22:15:43Z (GMT) No. of bitstreams: 1 JoaoTeixeiraDeCarvalhoNeto_TESE.pdf: 8174076 bytes, checksum: abcf3b6d3686c5b762d15c468555b83d (MD5) / Made available in DSpace on 2017-02-17T22:15:43Z (GMT). No. of bitstreams: 1 JoaoTeixeiraDeCarvalhoNeto_TESE.pdf: 8174076 bytes, checksum: abcf3b6d3686c5b762d15c468555b83d (MD5) Previous issue date: 2016-07-22 / A integra??o de unidades com fontes de energia prim?ria, com armazenamento de energia e cargas, ? esperada para desempenhar um papel promissor no futuro para o fornecimento de energia el?trica. A interliga??o em rede destas unidades fornecendo m?dia e baixa tens?o forma um sistema denominado de microgrid. As fontes de energia distribu?da s?o as unidades b?sicas para armazenamento e distribui??o de energia em microgrids. Estas fontes podem ser de um tipo h?brido que inclui uma fonte de energia prim?ria e armazenamento simultaneamente. Uma unidade de tipo h?brido ? proposta neste trabalho e consiste de um conversor Buck-Boost CC-CC que rastreia a pot?ncia m?xima fornecida por um painel fotovoltaico, um conversor Boost CC-CC que regula a tens?o do barramento CC do microgrid e um conversor Buck-Boost bidirecional CC-CC que controla o fluxo de energia na unidade, carregando ou descarregando um banco de baterias. O controle desses conversores deve considerar a prote??o da bateria contra picos de tens?o e transit?rios, assim como a prote??o das cargas conectadas ao barramento principal do microgrid, quando a bateria fornece a energia armazenada. As t?cnicas de controle convencionais utilizadas nos conversores destas unidades utilizam a modula??o por largura de pulso que tem a desvantagem de produzir transit?rios indesej?veis devido ? resposta lenta ?s varia??es na fonte de entrada do sistema ou nas cargas conectadas ao barramento principal do microgrid. Estes transit?rios podem vir a danificar outras cargas e baterias que estejam conectadas ao barramento principal do microgrid. A t?cnica de controle de um ciclo ? aplicada aos conversores chaveadores para permitir uma resposta r?pida a transit?rios, sem overshoots e erro nulo em regime permanente. O objetivo deste trabalho ? a utiliza??o desta t?cnica no controlador desses conversores, a fim de rastrear rapidamente o ponto de pot?ncia m?xima do painel fotovoltaico, carregar as baterias quando elas est?o descarregadas, e fornecer a energia das baterias para as cargas quando necess?rio, garantindo a prote??o das baterias e das cargas ligadas ao barramento principal do microgrid. / The integration of units with primary energy sources, energy storage and loads, is expected to play a promising role in the future for the electricity supply. The interconnection of such units providing medium and low voltage makes a microgrid system. The distributed energy sources are the basic units for storage and distribution in microgrids. These sources can be of a hybrid type, which includes a primary energy source and storage simultaneously. A hybrid type proposed in this paper consists of a DC-DC Buck-Boost converter that tracks the maximum power supplied by a photovoltaic panel, a DC-DC Boost converter that regulates the microgrid DC bus voltage and a DC-DC bidirectional Buck-Boost converter that controls the energy flow in the system, charging or discharging a battery bank. The control of these converters should consider the protection of the battery against voltage transients and spikes, as well as the protection of loads connected to the microgrid main bus when the battery supplies the stored energy. Conventional control techniques used on the converters of these units use the pulse width modulation, which has the disadvantage of produce undesirable transient due to the slow response to changes in the system input source, or the loads resistance connected to microgrid the main bus. These transients can damage other loads and batteries connected to the microgrid main bus. Thus, one-cycle control technique is applied to the switching converters to allow fast response to transient without overshoots and zero steady-state error. The objective of this work is to use this technique in controlling these converters in order to quickly track the maximum power point of the photovoltaic panel, charge the batteries when they are discharged, and provide power from the batteries to the loads when needed, ensuring the protection of the batteries and the loads connected to the microgrid main bus.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-02-17T19:02:34Z No. of bitstreams: 1 SarahThomazDeLimaSa_TESE.pdf: 9561415 bytes, checksum: 5da10f88dae690d82255e5fddab3e449 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-02-17T22:33:33Z (GMT) No. of bitstreams: 1 SarahThomazDeLimaSa_TESE.pdf: 9561415 bytes, checksum: 5da10f88dae690d82255e5fddab3e449 (MD5) / Made available in DSpace on 2017-02-17T22:33:33Z (GMT). No. of bitstreams: 1 SarahThomazDeLimaSa_TESE.pdf: 9561415 bytes, checksum: 5da10f88dae690d82255e5fddab3e449 (MD5) Previous issue date: 2016-08-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Este trabalho prop?e um ambiente web para rob?tica educacional, que ? uma solu??o aberta, din?mica e completa para auxiliar no processo de ensino-aprendizagem neste tipo de atividade. O ambiente permite que diferentes plataformas rob?ticas sejam programadas atrav?s do cadastro de linguagens de programa??o com suas respectivas fun??es de baixo n?vel utilizando uma linguagem intermedi?ria com alto n?vel de abstra??o. O sistema pode ser utilizado por qualquer tipo de usu?rio com ou sem experi?ncia em programa??o, atrav?s de uma linguagem com comandos textuais simples. Este trabalho oferece, ent?o, um sistema web completo que pode ser utilizado a fim de facilitar o processo de ensino aprendizagem utilizando rob?tica educacional. Al?m disso, para fins de valida??o o trabalho inclui um m?todo homog?neo para avalia??o de softwares para rob?tica educacional, o qual validou a ferramenta desenvolvida atrav?s de experimentos que avaliaram seu uso did?tico e suas funcionalidades e o comparou com outras ferramentas. / This work proposes a web environment for educational robotics, which is an open, dynamic and complete solution to assist in the teaching-learning process in this type activity. The environment allows different robotic platforms to be programmed through the registration of programming languages with their low level functions using an intermediate language with a high level of abstraction. The system can be used by any user with or without programming experience, through a language with simple text commands. Therefore, this work provides a full web system that can be used to facilitate the teaching/learning process using educational robotics. In addition, for validation purposes this work includes a homogeneous method for evaluating educational software for robotics, which validated the developed tool through experiments that have assessed its didactical use and its features and compared with other tools.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-03-14T21:32:46Z No. of bitstreams: 1 PetrucioRicardoTavaresDeMedeiros_DISSERT.pdf: 5937912 bytes, checksum: c98c0e639d8348140e2635081d9744f4 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-15T22:29:35Z (GMT) No. of bitstreams: 1 PetrucioRicardoTavaresDeMedeiros_DISSERT.pdf: 5937912 bytes, checksum: c98c0e639d8348140e2635081d9744f4 (MD5) / Made available in DSpace on 2017-03-15T22:29:35Z (GMT). No. of bitstreams: 1 PetrucioRicardoTavaresDeMedeiros_DISSERT.pdf: 5937912 bytes, checksum: c98c0e639d8348140e2635081d9744f4 (MD5) Previous issue date: 2016-07-20 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O foveamento ? uma t?cnica de vis?o computacional capaz de promover a redu??o da informa??o visual atrav?s de uma transforma??o da imagem, em dom?nio espacial, para o dom?nio de multirresolu??o. Entretanto, esta t?cnica se limita a uma ?nica f?vea com mobilidade dependente do contexto. Neste trabalho s?o propostas a defini??o e a constru??o de um modelo multifoveado denominado MMMF (multifoveamento em multirresolu??o com f?veas m?veis) baseado em um modelo anterior denominado MMF (multirresolu??o com f?vea m?vel). Em um contexto de m?ltiplas f?veas, a aplica??o de v?rias estruturas MMF, uma para cada f?vea, resulta em um consider?vel aumento de processamento, uma vez que h? interse??es entre regi?es de estruturas distintas, as quais s?o processadas m?ltiplas vezes. Dadas as estruturas de f?veas MMF, propomos um algoritmo para obter regi?es disjuntas que devem ser processadas, evitando regi?es redundantes e, portanto, reduzindo o tempo de processamento. Experimentos s?o propostos para validar o modelo e verificar a sua aplicabilidade no contexto de vis?o computacional. Resultados demonstram o ganho em termos de tempo de processamento do modelo proposto em rela??o ao uso de m?ltiplas f?veas do modelo MMF. / Foveation is a computer vision technique for visual information reduction obtained by applying an image transformation in the spatial domain to the multiresolution domain. However, this technique is limited to a single fovea context-dependent mobility. This work proposes the definition and the construction of a multifoveated model called MMMF (Multiresolution Multifoveation using Mobile Foveae) based on an earlier model called MMF (Multiresolution with Moving Fovea). In the context of multiple foveae, the application of various MMF structures, one for each fovea, results in an increase in processing time, since there are intersections between regions of different structures, which are processed multiple times. Given MMF structures, an algorithm in order to get disjoint regions which are to be processed is proposed, avoiding redundant regions and thereby reducing the processing time. Experiments are proposed to validate the model and to verify its applicability in the computer vision context. Results show the gain in processing time of the proposed model compared to the use of multiple MMF structures.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-03-20T19:50:20Z No. of bitstreams: 1 LucileideMedeirosDantasDaSilva_DISSERT.pdf: 995627 bytes, checksum: c5a0cf7ba1df8a88275e1f7c185e1eac (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-22T19:38:28Z (GMT) No. of bitstreams: 1 LucileideMedeirosDantasDaSilva_DISSERT.pdf: 995627 bytes, checksum: c5a0cf7ba1df8a88275e1f7c185e1eac (MD5) / Made available in DSpace on 2017-03-22T19:38:28Z (GMT). No. of bitstreams: 1 LucileideMedeirosDantasDaSilva_DISSERT.pdf: 995627 bytes, checksum: c5a0cf7ba1df8a88275e1f7c185e1eac (MD5) Previous issue date: 2016-11-18 / O Q-learning ? uma t?cnica de aprendizagem por refor?o off-policy que tem como principal vantagem a possibilidade de obter uma pol?tica ?tima interagindo com o ambiente sem que o modelo deste ambiente necessite ser conhecido. Este trabalho descreve uma proposta de arquitetura paralela em ponto fixo da t?cnica usando hardware reconfigur?vel do FPGA (Field Programmable Gates Arrays). O objetivo de desenvolver essa t?cnica em hardware ? otimizar o tempo de processamento do sistema. S?o apresentados resultados de converg?ncia do algoritmo, ?rea de ocupa??o e frequ?ncia de amostragem. Tamb?m s?o apresentados detalhes de implementa??o da arquitetura. O projeto foi desenvolvido utilizando a plataforma de desenvolvimento System Generator da Xilinx sendo projetado para o FPGA Virtex 6 xc6vcx240t-1ff1156. / Q-learning is a off-policy reinforcement learning technique which has as main advantage the possibility of obtaining an optimal policy interacting with an unknown model environment. This work proposes a parallel fixed-point Q-learning algorithm architecture, implemented in FPGA. Fundamental to this approach is optimize system processing time. Convergence results are presented. The processing time and occupied area were analyzed for diferentes scenarios and various fixed point formats. Architecture implementation details were featured. The entire project was developed using the System Generator platform (Xilinx), with a Virtex-6 xc6vcx240t-1ff1156 as the target FPGA.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-03-20T19:50:21Z No. of bitstreams: 1 RafaelCelestinoDosSantos_DISSERT.pdf: 2928154 bytes, checksum: ed85070c1f646df9265898c17421fbdd (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-22T19:46:13Z (GMT) No. of bitstreams: 1 RafaelCelestinoDosSantos_DISSERT.pdf: 2928154 bytes, checksum: ed85070c1f646df9265898c17421fbdd (MD5) / Made available in DSpace on 2017-03-22T19:46:13Z (GMT). No. of bitstreams: 1 RafaelCelestinoDosSantos_DISSERT.pdf: 2928154 bytes, checksum: ed85070c1f646df9265898c17421fbdd (MD5) Previous issue date: 2016-12-16 / Este trabalho tem por objetivo apresentar a influ?ncia de uma metasuperf?cie, um tipo especial dos metamateriais, no desempenho das antenas de microfitas. As metasuperf?cies s?o materiais artificiais que n?o s?o encontrados em sua forma convencional na natureza e apresentam caracter?sticas eletromagn?ticas n?o convencionais, como o ?ndice de refra??o e os coeficientes de permissividade el?trica e permeabilidade magn?tica negativos o que provocam efeitos eletromagn?ticos atrativos para diversas aplica??es, como por exemplo: melhorar a performance de uma antena de microfita como ser? mostrado nesse trabalho. Iniciaremos o trabalho mostrando um breve hist?rico, defini??es e propriedades eletromagn?ticas das antenas, antenas de microfita, metamateriais e das metasuperf?cies. Em seguida, iremos projetar e confeccionar uma antena de microfita com e sem a utiliza??o de uma metasuperf?cie onde simularemos atrav?s do software HFSS Ansoft Designer e testaremos em laborat?rio atrav?s do equipamento E5071C ENA Network Analyzer. Por fim, realizaremos uma an?lise comparativa, mostrando o quanto a metasuperf?cie melhora a performance de uma antena de microfita atrav?s de uma an?lise dos diversos par?metros da antena, como: perda de retorno, ganho de pot?ncia, diretividade e imped?ncia de entrada. / This paper aims to present the influence of a metasurface, a special type of metamaterials, in the performace of microstrip antennas. The metasurface are artificial materials that are not found in a conventional manner in nature and do not have conventional electromagnetic characteristics such as refractive index and coefficient of permittivity and negative magnetic permeability which causes attractive electromagnetic effects for various applications, such as: improving the performance of a microstrip antenna as will be shown in this work. We started the work showing a brief history, definitions and electromagnetic properties of the antennas, microstrip antennas, metamaterials and metasuperf?cies. Next, we will design and manufacture a microstrip antenna with and without the use of a metasurface where we will simulate through HFSS Ansoft Designer software and test in the laboratory with the E5071C ENA Network Analyzer. Finally, we will perform a comparative analysis, showing how the metasurface improves the performance of a microstrip antenna by analysis of the various parameters antenna, such as: return loss, power gain, directivity and input impedance.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-04-03T19:47:14Z No. of bitstreams: 1 AndreQuintilianoBezerraSilva_DISSERT.pdf: 6705778 bytes, checksum: 90ff28923ed0270632f9a0851890a75a (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-04-05T21:51:32Z (GMT) No. of bitstreams: 1 AndreQuintilianoBezerraSilva_DISSERT.pdf: 6705778 bytes, checksum: 90ff28923ed0270632f9a0851890a75a (MD5) / Made available in DSpace on 2017-04-05T21:51:32Z (GMT). No. of bitstreams: 1 AndreQuintilianoBezerraSilva_DISSERT.pdf: 6705778 bytes, checksum: 90ff28923ed0270632f9a0851890a75a (MD5) Previous issue date: 2017-02-14 / Um dos principais objetivos da intelig?ncia artificial ? a cria??o de agentes inspirados na intelig?ncia humana. Isso vem sendo pesquisado utilizando v?rias abordagens, e entre as mais promissoras para o aprendizado de m?quinas est?o os sistemas simb?licos baseados na l?gica e as redes neurais artificiais. At? a ?ltima d?cada, ambas as abordagens progrediam de forma independente, mas os progressos obtidos em ambas as ?reas fizeram com que os pesquisadores come?assem a investigar maneiras de integrar as duas t?cnicas. Diversos modelos que proporcionam a integra??o h?brida ou integrada desses m?todos inteligentes surgiram na d?cada de 90 e continuam sendo utilizadas e melhoradas at? hoje. Esse trabalho tem como objetivo principal a implementa??o e uso do algoritmo de convers?o neuro-simb?lica do sistema h?brido Knowledge-Based Artificial Neural Networks (KBANN). O sistema possui a capacidade de mapear um dom?nio te?rico espec?fico de regras (se-ent?o) em uma rede neural e refinar a rede utilizando t?cnicas de aprendizado. Al?m disso, como o algoritmo criado por Towell et al. (1990) n?o possui a capacidade de adquirir novos conhecimentos sem distorcer o que j? foi aprendido, utilizou-se o algoritmo TopGen (Optiz e Shavlik, 1995) para adicionar tal capacidade a rede. O trabalho utilizou um jogo de tabuleiro para realizar experimentos devido a quantidade e o conhecimento existente sobre as regras do jogo. O sistema implementado obteve resultados interessantes, mesmo com a pertuba??o do dom?nio inicial de regras (com a exclus?o parcial), obtendo uma taxa de acerto pr?xima a 100%. Portanto, a partir dos resultados obtidos foi poss?vel concluir que o sistema h?brido ? capaz de se sobrepor a situa??es adversas a qual foi submetido nessa pesquisa. / One of the main goals of artificial intelligence is the creation of agents with humanlike intelligence. This has been researched using various approaches, and among the most prominent for machine learning are logic-based symbolic systems and artificial neural networks. Until the last decade, both approaches have progressed independently, but progress in both areas has led researchers to investigate ways to integrate both approaches. Several models that provide hybrid or integrated integration of these approaches emerged in the 1990s, and continue to be used to this day. This work has as main objective the implementation and use of the Neural-Symbolic conversion algorithm of Knowledge-Based Artificial Neural Networks (KBANN), the system has the ability to map a specific theoretical domain of rules (if-then) into a neural network, and refine the network using learning techniques. In addition, since the algorithm created by (Towell et al., 1990) does not have the capacity to acquire new knowledge and introduce them to the neural network, the algorithm TopGen (Optiz and Shavlik, 1995) will be used to add The network without losing the original knowledge acquired. The work used a board game to conduct experiments due to the well established rules of the game. The implemented system obtained interesting results, even with the initial rule domain perturbation (with the exclusion of them), obtaining an accuracy rate close to 100 %. Therefore, from the obtained results it was possible to conclude that the hybrid systems are able to overlap to adverse situations which were carried out the analyzes proposed in this research.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-04-03T19:47:14Z No. of bitstreams: 1 AntonioPericlesBonfimSaraivaDeOliveira_DISSERT.pdf: 17560753 bytes, checksum: 51b3d3c86c26db7e30f346b8d46e49f0 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-04-05T22:11:52Z (GMT) No. of bitstreams: 1 AntonioPericlesBonfimSaraivaDeOliveira_DISSERT.pdf: 17560753 bytes, checksum: 51b3d3c86c26db7e30f346b8d46e49f0 (MD5) / Made available in DSpace on 2017-04-05T22:11:52Z (GMT). No. of bitstreams: 1 AntonioPericlesBonfimSaraivaDeOliveira_DISSERT.pdf: 17560753 bytes, checksum: 51b3d3c86c26db7e30f346b8d46e49f0 (MD5) Previous issue date: 2012-08-13 / Prop?e-se a cria??o de um controle neural (neurocontrolador) baseado na aprendiza-gem supervisionada, com uma rede neural artificial (RNA), sem a modelagem por espa?ode estados, utilizando o Flightgear como simulador e ambientes de testes integrado comm?dulos de coleta de dados e controle. Diversas arquiteturas da RNA foram testadas afim de que as mesma tivesse a efic?cia pretendida nos diversos procedimentos (decola-gem, pairagem, deslocamento e pouso). Testes com as RNA treinadas foram realizadosat? que fosse encontrada uma pudesse gerar as respostas necess?rias atendendo aos requi-sitos de efici?ncia e estabilidade necess?rios ao controle do VANT.