Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-06T19:34:30Z No. of bitstreams: 1 MarceloHenriqueRamalhoNobre_TESE.pdf: 4355071 bytes, checksum: 05cf1b490e598685ec4e7b682423a8d9 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-06T22:04:01Z (GMT) No. of bitstreams: 1 MarceloHenriqueRamalhoNobre_TESE.pdf: 4355071 bytes, checksum: 05cf1b490e598685ec4e7b682423a8d9 (MD5) / Made available in DSpace on 2016-07-06T22:04:01Z (GMT). No. of bitstreams: 1 MarceloHenriqueRamalhoNobre_TESE.pdf: 4355071 bytes, checksum: 05cf1b490e598685ec4e7b682423a8d9 (MD5) Previous issue date: 2015-11-23 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A comunica??o sem fios ? uma tend?ncia no ambiente industrial atualmente e nessa tend?ncia temos o WirelessHART como uma das principais tecnologias. Com essa situa??o, ? natural que melhorias no desempenho sejam buscadas e um dos principais caminhos para isso passa pelo desenvolvimento de algoritmos de escalonamento e roteamento. Nesta tese ? apresentado uma revis?o da literatura sobre as principais solu??es em escalonamento e roteamento desenvolvidas especificamente para a tecnologia WirelessHART. Al?m disso prop?e um novo Algoritmo de escalonamento chamando Escalonamento Flow que visa melhorar aspectos de flexibilidade e de utiliza??o do superframe. Para prop?sitos de valida??o, ? desenvolvido e utilizado um m?dulo de simula??o para o Network Simulator 3 (NS-3) que modela aspectos como posicionamento, atenua??o de sinal e consumo de energia al?m de prover simula??es mais exatas por meio de configura??es de erro individuais para cada link. Este m?dulo tamb?m possibilita a gera??o do superframe de escalonamento a partir do grafo de roteamento utilizando os algoritmos Flow e Han. Para a valida??o do novo algoritmo s?o realizados experimentos comparativos entre o algoritmo Han e algoritmo Flow, avaliando crit?rios de aloca??o de links, delay e taxa de ocupa??o de superframe. Para valida??o da camada f?sica do m?dulo de simula??o, o escalonamento e o roteamento s?o configurados estaticamente e s?o desenvolvidos experimentos de confiabilidade e consumo de energia com topologias validadas na literatura e com varia??es de probabilidades de erro. / Wireless Communication is a trend in the industrial environment nowadays and on this trend, we can highlight the WirelessHART technology. In this situation, it is natural the search for new improvements in the technology and such improvements can be related directly to the routing and scheduling algorithms. In the present thesis, we present a literature review about the main specific solutions for Routing and scheduling for WirelessHART. The thesis also proposes a new scheduling algorithm called Flow Scheduling that intends to improve superframe utilization and flexibility aspects. For validation purposes, we develop a simulation module for the Network Simulator 3 (NS-3) that models aspects like positioning, signal attenuation and energy consumption and provides an link individual error configuration. The module also allows the creation of the scheduling superframe using the Flow and Han Algorithms. In order to validate the new algorithms, we execute a series of comparative tests and evaluate the algorithms performance for link allocation, delay and superframe occupation. In order to validate the physical layer of the simulation module, we statically configure the routing and scheduling aspects and perform reliability and energy consumption tests using various literature topologies and error probabilities.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-08T21:04:12Z No. of bitstreams: 1 DanielleBritoMarques_DISSERT.pdf: 1150264 bytes, checksum: 03bad34d87fb1cfd1e955c88e9a7b670 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-12T18:06:49Z (GMT) No. of bitstreams: 1 DanielleBritoMarques_DISSERT.pdf: 1150264 bytes, checksum: 03bad34d87fb1cfd1e955c88e9a7b670 (MD5) / Made available in DSpace on 2016-07-12T18:06:49Z (GMT). No. of bitstreams: 1 DanielleBritoMarques_DISSERT.pdf: 1150264 bytes, checksum: 03bad34d87fb1cfd1e955c88e9a7b670 (MD5) Previous issue date: 2015-12-04 / Redes inteligentes representam um novo conceito de distribui??o de energia el?trica, que s?o o futuro dos sistemas atuais. Essas redes t?m sido introduzidas com o objetivo de aumentar a confiabilidade dos sistemas, prover alternativas para o suprimento de energia e reduzir custos. O aumento da complexidade das redes de energia, a crescente demanda e a introdu??o de fontes renov?veis de gera??o de energia, requerem uma integra??o e opera??o de todos os componentes do sistema, a fim de garantir altos ?ndices de confiabilidade e disponibilidade (dependabilidade). A sistematiza??o das redes inteligentes a partir do formalismo matem?tico de ?rvores de Falhas possibilita a analise quantitativa de tais ?ndices. Nesse trabalho ? proposto uma metodologia para an?lise da dependabilidade de redes inteligentes no contexto de distribui??o de energia el?trica. Um estudo de caso ? proposto para validar a proposta. A partir da metodologia ? poss?vel estimar ainda na fase de projeto a confiabilidade, disponibilidade e identificar os pontos cr?ticos da rede atrav?s das distribui??es estoc?sticas das taxas de falhas e reparos dos componentes. / Smart Grids are a new trend of electric power distribution, the future of current systems. These networks are continually being introduced in order to improve the reliability of systems, providing alternatives to energy supply and cost savings. Faced with increasing electric power grids complexity, the energy demand and the introduction of alternative sources to energy generation, all components of system require a fully integration in order to achieve high reliability and availability levels (dependability). The systematization of a Smart Grid from the Fault Tree formalism enable the quantitative evaluation of dependability of a specific scenario. In this work, a methodology for dependability evaluation of Smart Grids is proposed. A study of case is described in order to validate the proposal. With the use of this methodology, it is possible to estimate during the early design phase the reliability, availability of Smart Grid beyond to identify the critical points from the failure and repair distributions of components.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-22T15:28:33Z No. of bitstreams: 1 BoanergesVictorSoaresDeAraujo_DISSERT.pdf: 1038853 bytes, checksum: 6cb9d474725caa33946cdd3023ef86e4 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-27T21:26:40Z (GMT) No. of bitstreams: 1 BoanergesVictorSoaresDeAraujo_DISSERT.pdf: 1038853 bytes, checksum: 6cb9d474725caa33946cdd3023ef86e4 (MD5) / Made available in DSpace on 2016-07-27T21:26:40Z (GMT). No. of bitstreams: 1 BoanergesVictorSoaresDeAraujo_DISSERT.pdf: 1038853 bytes, checksum: 6cb9d474725caa33946cdd3023ef86e4 (MD5) Previous issue date: 2015-08-17 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Gases-tra?o s?o importantes para nosso ambiente, mesmo se manifestando apenas em ?tra?os?, mas suas concentra??es devem ser monitoradas, para que quaisquer interven??es necess?rias sejam tomadas a tempo. Condi??es apropriadas para nossas vidas residem dentro de limites inferiores e superiores destes gases, por isso seu monitoramento ? essencial hoje em dia e diversas t?cnicas podem ser usadas para este fim. Uma delas ? a espectroscopia de absor??o ?ptica diferencial (DOAS), que consiste de uma regress?o - o m?todo cl?ssico usa m?nimos quadrados - para determinar a concentra??o dos gases-tra?o. Para melhorar os resultados, diversos estudos buscaram abordagens alternativas. Alguns tentaram pr?-processar o sinal, atrav?s de uma remo??o de ru?do, e.g., usando transformada wavelet discreta (DWT). Este trabalho apresenta um estudo semi-emp?rico para encontrar a DWT com o melhor desempenho para remo??o de ru?do. Dentre diversas fam?lias conhecidas, buscou-se aquelas cuja remo??o de ru?do foram melhor, preservando caracter?sticas principais do sinal original, ent?o com a redu??o do ru?do, o res?duo ap?s a regress?o tamb?m diminui. A an?lise leva em conta o n?vel de decomposi??o wavelet, o limiar aplicado nos coeficientes de detalhe e como aplic?-los - limiariaza??o abrupta ou suave. Os sinais usados prov?m de um banco de dados aberto e online com sinais caracter?sticos de gases-tra?o usualmente estudados. / Trace gases are important to our environment even though their presence comes only by ?traces?, but their concentrations must be monitored, so any necessary interventions can be done at the right time. There are some lower and upper boundaries which produce nice conditions for our lives and then monitoring trace gases comes as an essential task nowadays to be accomplished by many techniques. One of them is the differential optical absorption spectroscopy (DOAS), which consists mathematically on a regression - the classical method uses least-squares - to retrieve the trace gases concentrations. In order to achieve better results, many works have tried out different techniques instead of the classical approach. Some have tried to preprocess the signals to be analyzed by a denoising procedure - e.g. discrete wavelet transform (DWT). This work presents a semi-empirical study to find out the most suitable DWT family to be used in this denoising. The search seeks among many well-known families the one to better remove the noise, keeping the original signal?s main features, then by decreasing the noise, the residual left after the regression is done decreases too. The analysis take account the wavelet decomposition level, the threshold to be applied on the detail coefficients and how to apply them - hard or soft thresholding. The signals used come from an open and online data base which contains characteristic signals from some trace gases usually studied.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-22T15:28:33Z No. of bitstreams: 1 JonasDamascenoBatistaDeAraujo_DISSERT.pdf: 3604743 bytes, checksum: 5ae42e6f32fd99f10a6d6092e639b58a (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-27T21:50:25Z (GMT) No. of bitstreams: 1 JonasDamascenoBatistaDeAraujo_DISSERT.pdf: 3604743 bytes, checksum: 5ae42e6f32fd99f10a6d6092e639b58a (MD5) / Made available in DSpace on 2016-07-27T21:50:25Z (GMT). No. of bitstreams: 1 JonasDamascenoBatistaDeAraujo_DISSERT.pdf: 3604743 bytes, checksum: 5ae42e6f32fd99f10a6d6092e639b58a (MD5) Previous issue date: 2015-12-09 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O aumento da efici?ncia de sistemas foto-voltaicos tem sido alvo de diversos estudos nos ?ltimos anos. Uma das formas poss?veis de aumentar a pot?ncia extra?da por um painel foto-voltaico ? o rastreamento solar, realizando a sua movimenta??o de modo a seguir a trajet?ria do sol. Esta movimenta??o exige que o motor el?trico empregado possua torque suficiente e baixa velocidade, garantindo a precis?o do rastreamento. Com o uso de inversores tipo fonte de tens?o e de dispositivos que gerem a l?gica de chaveamento adequada ? poss?vel obter o torque e a velocidade necess?rios para o funcionamento do sistema. Este trabalho descreve a implementa??o de um sistema de controle de posi??o a ser aplicado no rastreador solar constru?do no Laborat?rio de Eletr?nica de Pot?ncia e Energias Renov?veis, situado na UFRN. A varia??o da velocidade do motor ? realizada atrav?s de um inversor tipo fonte de tens?o cujo comando PWM para acionamento das chaves ser? gerado por um dispositivo microcontrolador dedicado. O sensor utilizado para medi??o da inclina??o do painel ? um sensor de estado s?lido do tipo aceler?metro interfaceado ao microcontrolador. A posi??o solar ? tamb?m calculada pelo microcontrolador ? partir das coordenadas geogr?ficas do ponto de instala??o, e da data e hora locais obtidas a partir de um dispositivo RTC (Real-Time Clock). Um prot?tipo de rastreador solar polar de um eixo, movimentado por um motor CC, foi montado para atestar o funcionamento do sensor e verificar se o rastreamento ? realizado de forma eficiente. / The increase in the efficiency of photo-voltaic systems has been the object of various studies the past few years. One possible way to increase the power extracted by a photovoltaic panel is the solar tracking, performing its movement in order to follow the sun?s path. One way to activate the tracking system is using an electric induction motor, which should have sufficient torque and low speed, ensuring tracking accuracy. With the use of voltage source inverters and logic devices that generate the appropriate switching is possible to obtain the torque and speed required for the system to operate. This paper proposes the implementation of a angular position sensor and a driver to be applied in solar tracker built at a Power Electronics and Renewable Energies Laboratory, located in UFRN. The speed variation of the motor is performed via a voltage source inverter whose PWM command to actuate their keys will be implemented in an FPGA (Field Programmable Gate Array) device and a TM4C microcontroller. A platform test with an AC induction machine of 1.5 CV was assembled for the comparative testing. The angular position sensor of the panel is implemented in a ATMega328 microcontroller coupled to an accelerometer, commanded by an Arduino prototyping board. The solar position is also calculated by the microcontroller from the geographic coordinates of the site where it was placed, and the local time and date obtained from an RTC (Real-Time Clock) device. A prototype of a solar tracker polar axis moved by a DC motor was assembled to certify the operation of the sensor and to check the tracking efficiency.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-08-09T22:51:25Z No. of bitstreams: 1 CarlosAlbertoDeAlbuquerqueSilva_TESE.pdf: 4568486 bytes, checksum: 5ddf18d55603ffd49ea2899025e1615f (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-10T23:15:49Z (GMT) No. of bitstreams: 1 CarlosAlbertoDeAlbuquerqueSilva_TESE.pdf: 4568486 bytes, checksum: 5ddf18d55603ffd49ea2899025e1615f (MD5) / Made available in DSpace on 2016-08-10T23:15:49Z (GMT). No. of bitstreams: 1 CarlosAlbertoDeAlbuquerqueSilva_TESE.pdf: 4568486 bytes, checksum: 5ddf18d55603ffd49ea2899025e1615f (MD5) Previous issue date: 2015-09-04 / Ag?ncia Nacional do Petr?leo - ANP / As Redes Neurais Artificiais (RNAs), que constituem uma das ramifica??es da Intelig?ncia Artificial (IA), est?o sendo empregadas como solu??o para v?rios problemas complexos, existentes nas mais diversas ?reas. Para a solu??o destes problemas torna-se indispens?vel que sua implementa??o seja feita em hardware. Em meio as estrat?gias a serem adotadas e satisfeitas durante a fase de projeto e implementa??o das RNAs em hardware, as conex?es entre os neur?nios s?o as que necessitam de maior aten??o. Recentemente, encontram-se RNAs implementadas tanto em circuitos integrados de aplica??o espec?fica (Application Specific Integrated Circuits - ASIC) quanto em circuitos integrados, configurados pelo usu?rio, a exemplo dos Field Programmable Gate Array (FPGAs), que possuem a capacidade de serem reconfigurados parcialmente, em tempo de execu??o, formando, portanto, um Sistema Parcialmente Reconfigur?vel (SPR), cujo emprego proporciona diversas vantagens, tais como: flexibilidade na implementa??o e redu??o de custos. Tem-se observado um aumento considerado no uso destes dispositivos para a implementa??o de RNAs. Diante do exposto, prop?e-se a implementa??o de uma matriz de neur?nios dinamicamente reconfigur?vel no FPGA Virtex 6 da Xilinx, descrita em linguagem de hardware e que possa absorver projetos baseados em plataforma de sistemas embarcados, dedicados ao controle distribu?do de equipamentos normalmente utilizados na ind?stria. Prop?e-se ainda, que a configura??o das topologias das RNAs que possam vir a ser formadas, seja realizada via software. / The Artificial Neural Networks (ANN), which is one of the branches of Artificial Intelligence (AI), are being employed as a solution to many complex problems existing in several areas. To solve these problems, it is essential that its implementation is done in hardware. Among the strategies to be adopted and met during the design phase and implementation of RNAs in hardware, connections between neurons are the ones that need more attention. Recently, are RNAs implemented both in application specific integrated circuits's (Application Specific Integrated Circuits - ASIC) and in integrated circuits configured by the user, like the Field Programmable Gate Array (FPGA), which have the ability to be partially rewritten, at runtime, forming thus a system Partially Reconfigurable (SPR), the use of which provides several advantages, such as flexibility in implementation and cost reduction. It has been noted a considerable increase in the use of FPGAs for implementing ANNs. Given the above, it is proposed to implement an array of reconfigurable neurons for topologies Description of artificial neural network multilayer perceptrons (MLPs) in FPGA, in order to encourage feedback and reuse of neural processors (perceptrons) used in the same area of the circuit. It is further proposed, a communication network capable of performing the reuse of artificial neurons. The architecture of the proposed system will configure various topologies MLPs networks through partial reconfiguration of the FPGA. To allow this flexibility RNAs settings, a set of digital components (datapath), and a controller were developed to execute instructions that define each topology for MLP neural network.

Made available in DSpace on 2014-12-17T14:56:07Z (GMT). No. of bitstreams: 1 FranciscoAAS_DISSERT.pdf: 1526658 bytes, checksum: 7ba5b80f03a10eaf25a4f9e6a4c91372 (MD5) Previous issue date: 2012-08-07 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Artificial neural networks are usually applied to solve complex problems. In problems with more complexity, by increasing the number of layers and neurons, it is possible to achieve greater functional efficiency. Nevertheless, this leads to a greater computational effort. The response time is an important factor in the decision to use neural networks in some systems. Many argue that the computational cost is higher in the training period. However, this phase is held only once. Once the network trained, it is necessary to use the existing computational resources efficiently. In the multicore era, the problem boils down to efficient use of all available processing cores. However, it is necessary to consider the overhead of parallel computing. In this sense, this paper proposes a modular structure that proved to be more suitable for parallel implementations. It is proposed to parallelize the feedforward process of an RNA-type MLP, implemented with OpenMP on a shared memory computer architecture. The research consistes on testing and analizing execution times. Speedup, efficiency and parallel scalability are analyzed. In the proposed approach, by reducing the number of connections between remote neurons, the response time of the network decreases and, consequently, so does the total execution time. The time required for communication and synchronization is directly linked to the number of remote neurons in the network, and so it is necessary to investigate which one is the best distribution of remote connections / As redes neurais artificiais geralmente s?o aplicadas ? solu??o de problemas comple- xos. Em problemas com maior complexidade, ao aumentar o n?mero de camadas e de neur?nios, ? poss?vel conseguir uma maior efici?ncia funcional, por?m, isto acarreta em um maior esfor?o computacional. O tempo de resposta ? um fator importante na decis?o de us?-las em determinados sistemas. Muitos defendem que o maior custo computacional est? na fase de treinamento. Por?m, esta fase ? realizada apenas uma ?nica vez. J? trei- nada, ? necess?rio usar os recursos computacionais existentes de forma eficiente. Diante da era multicore esse problema se resume ? utiliza??o eficiente de todos os n?cleos de processamento dispon?veis. No entanto, ? necess?rio considerar a sobrecarga existente na computa??o paralela. Neste sentido, este trabalho prop?e uma estrutura modular que ? mais adequada para as implementa??es paralelas. Prop?e-se paralelizar o processo feed- forward (passo para frente) de uma RNA do tipo MLP, implementada com o OpenMP em uma arquitetura computacional de mem?ria compartilhada. A investiga??o dar-se-? com a realiza??o de testes e an?lises dos tempos de execu??o. A acelera??o, a efici?ncia e a es- calabilidade s?o analisados. Na proposta apresentada ? poss?vel perceber que, ao diminuir o n?mero de conex?es entre os neur?nios remotos, o tempo de resposta da rede diminui e por consequ?ncia diminui tamb?m o tempo total de execu??o. O tempo necess?rio para comunica??o e sincronismo est? diretamente ligado ao n?mero de neur?nios remotos da rede, sendo ent?o, necess?rio observar sua melhor distribui??o

Made available in DSpace on 2014-12-17T14:56:09Z (GMT). No. of bitstreams: 1 DanielGC.pdf: 538651 bytes, checksum: 34bfc134a2af9166b846b044a2968b16 (MD5) Previous issue date: 2006-05-25 / New versions of SCTP protocol allow the implementation of handover procedures in the transport layer, as well as the supply of a partially reliable communication service. A communication architecture is proposed herein, integrating SCTP with the session initiation protocol, SIP, besides additional protocols. This architecture is intended to handle voice applications over IP networks with mobility requirements. User localization procedures are specified in the application layer as well, using SIP, as an alternative mean to the mechanisms used by traditional protocols, that support mobility in the network layer. The SDL formal specification language is used to specify the operation of a control module, which coordinates the operation of the system component protocols. This formal specification is intended to prevent ambiguities and inconsistencies in the definition of this module, assisting in the correct implementation of the elements of this architecture / Novas vers?es do protocolo SCTP permitem sua utiliza??o para implementa??o de mecanismos de handover em n?vel de transporte, bem como o fornecimento de um servi?o de transmiss?o de dados parcialmente confi?vel. Integrando o SCTP com o protocolo de inicia??o de sess?es, SIP, al?m de utilizar adicionalmente servi?os de outros protocolos auxiliares, uma arquitetura de comunica??o p?de ser proposta, a fim de atender ?s aplica??es de voz sobre IP com requisitos de mobilidade. S?o especificados ainda os procedimentos de localiza??o de usu?rio em n?vel de aplica??o, utilizando o protocolo SIP, como alternativa aos mecanismos empregados por protocolos tradicionais que suportam mobilidade na camada de rede. A linguagem de especifica??o formal SDL ? utilizada para especificar o funcionamento de um M?dulo de Controle, relacionado ? opera??o coordenada dos protocolos que comp?e a arquitetura. Pretende-se assim evitar ambig?idades e inconsist?ncias na defini??o desse m?dulo, o que pode auxiliar em implementa??es corretas de elementos dessa arquitetura

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2018-02-15T11:21:03Z No. of bitstreams: 1 MatheusFernandesTorquato_DISSERT.pdf: 2354339 bytes, checksum: 32d0b6ee431808fccf375481ef94b8a9 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2018-02-16T11:39:52Z (GMT) No. of bitstreams: 1 MatheusFernandesTorquato_DISSERT.pdf: 2354339 bytes, checksum: 32d0b6ee431808fccf375481ef94b8a9 (MD5) / Made available in DSpace on 2018-02-16T11:39:52Z (GMT). No. of bitstreams: 1 MatheusFernandesTorquato_DISSERT.pdf: 2354339 bytes, checksum: 32d0b6ee431808fccf375481ef94b8a9 (MD5) Previous issue date: 2017-12-01 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Os Algoritmos Gen?ticos (AGs) s?o utilizados para resolver problemas de busca e otimiza??o no qual, uma solu??o ?tima pode ser encontrada utilizando um processo iterativo e transi??es probabil?sticas. Todavia, dependendo do tipo de problema, o tempo para encontrar a solu??o pode ser elevado em m?quinas sequenciais devido ? complexidade computacional do algoritmo gen?tico. Assim, esse trabalho possui como objetivo o desenvolvimento de um prot?tipo associado a uma implementa??o paralela de um algoritmo gen?tico em FPGA (Field-programmable gate array). O principal objetivo do desenvolvimento dessa arquitetura ? a otimiza??o do tempo de processamento do sistema. Resultados associados com o tempo de processamento e a ?rea ocupada para v?rios tamanhos de popula??o foram analisados. Estudos relativos ? precis?o da resposta do algoritmo gen?tico para o problema de otimiza??o de fun??es com uma e duas vari?veis tamb?m foram analisados para a implementa??o em hardware. Todo projeto foi desenvolvido utilizando a plataforma de desenvolvimento System Generator da Xilinx tendo como FPGA alvo um Virtex-7 xc7vx550t-1ffg1158 FPGA. / Genetic Algorithms (GAs) are used to solve search and optimization problems in which an optimal solution can be found using an iterative process and using probabilistic transitions. However, depending on the type of problem, the time required to find a solution can be high in sequential machines due to the computational complexity of genetic algorithm. This work proposes a parallel implementation of a genetic algorithm on fieldprogrammable gate array (FPGA). Optimization of the system?s processing time is the main goal of this project. Results associated with the processing time and area occupancy (in FPGA) for various population size are analyzed. Studies concerning the accuracy of the GA response for the optimization of functions with one and two variables were also analyzed for the hardware implementation. The project was developed using the System Generator software (Xilinx development platform) and the Virtex-7 xc7vx550t-1ffg1158 FPGA.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2018-02-21T21:29:05Z No. of bitstreams: 1 BrunoJeffersonDeSousaPessoa_TESE.pdf: 1029802 bytes, checksum: fb7e1bbf01b30106e4b0a64511f955d1 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2018-02-22T22:38:00Z (GMT) No. of bitstreams: 1 BrunoJeffersonDeSousaPessoa_TESE.pdf: 1029802 bytes, checksum: fb7e1bbf01b30106e4b0a64511f955d1 (MD5) / Made available in DSpace on 2018-02-22T22:38:00Z (GMT). No. of bitstreams: 1 BrunoJeffersonDeSousaPessoa_TESE.pdf: 1029802 bytes, checksum: fb7e1bbf01b30106e4b0a64511f955d1 (MD5) Previous issue date: 2017-12-15 / Problemas de escalonamento aos quais s?o impostas restri??es relativas ?s dist?ncias temporais entre sucessivas execu??es de uma mesma tarefa possuem um grande n?mero de aplica??es, que variam desde o escalonamento de tarefas em sistemas de tempo real ? produ??o de autom?veis em uma linha de montagem. O presente trabalho apresenta um novo problema de otimiza??o, denominado de Problema das Sequ?ncias Justas Ponderadas (PSJP), que faz parte dessa classe de problemas. Al?m do estudo da complexidade computacional do PSJP, ? apresentada uma formula??o matem?tica baseada em programa??o linear inteira mista e uma s?rie de cortes que aprimoram sua resolu??o via m?todos exatos. Para resolv?-lo, foram elaborados um m?todo iterativo que reduz o n?mero de vari?veis da formula??o proposta e uma solu??o heur?stica desenvolvida a partir da combina??o de meta-heur?sticas cl?ssicas da literatura. Experimentos computacionais mostram que, para um dado limite de tempo, as abordagens propostas aumentam significativamente o n?mero de inst?ncias resolvidas, preservando-se a qualidade das solu??es. / Scheduling problems on which constraints are imposed with regard to the temporal distances between successive executions of the same task have numerous applications, ranging from task scheduling in real-time systems to automobile production on a mixedmodel assembly line. This paper introduces a new NP-hard optimization problem belonging to this class of problems, namely the Weighted Fair Sequences Problem (WFSP). In addition to the study of the computational complexity of the WFSP, we present a mathematical formulation based on mixed-integer linear programming as well as a serie of cuts that improve the problem resolution via exact methods. To solve the WFSP, we propose an iterative method that greatly reduces the number of variables in the WFSP formulation and a heuristic solution developed from the combination of classical metaheuristics from the literature. Computational experiments show that, for a given time limit, the proposed approaches significantly increase the number of instances solved, preserving the quality of the solutions.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2018-03-12T13:20:56Z No. of bitstreams: 1 FabricioRooseveltMeloDaSilva_DISSERT.pdf: 12566402 bytes, checksum: d3f722d0746536b7850d988ebea66e60 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2018-03-14T13:01:59Z (GMT) No. of bitstreams: 1 FabricioRooseveltMeloDaSilva_DISSERT.pdf: 12566402 bytes, checksum: d3f722d0746536b7850d988ebea66e60 (MD5) / Made available in DSpace on 2018-03-14T13:01:59Z (GMT). No. of bitstreams: 1 FabricioRooseveltMeloDaSilva_DISSERT.pdf: 12566402 bytes, checksum: d3f722d0746536b7850d988ebea66e60 (MD5) Previous issue date: 2017-12-19 / Este trabalho tem como objetivo a adequa??o de uma esta??o de tratamento de ?gua, atrav?s do desenvolvimento e a implanta??o de um sistema de automa??o e supervis?o voltado para produ??o de ?gua purificada para fins farmac?uticos. A ?gua tem import?ncia fundamental na ind?stria farmac?utica, participa dos processos de limpeza de materiais e superf?cies, al?m de ser utilizada como ve?culo em formula??es, exigindo uma s?rie de especifica??es f?sico-qu?mica e microbiol?gicas. O processo de purifica??o da ?gua deve passar rotineiramente por um controle de qualidade r?gido e deve possuir um processo industrial conciso, automatizado e eficiente, de acordo com a legisla??o vigente. A utiliza??o de redes de automa??o e sistemas supervis?rios est? longe de ser novidade em qualquer tipo de ind?stria, por?m, neste caso, a planta industrial objeto de estudo n?o utilizava estas ferramentas. Para atingir o objetivo proposto fez-se a implementa??o de uma rede de comunica??o industrial entre os equipamentos da planta, atrav?s de uma rede padr?o MODBUS, uma rede instrumental com sinal de corrente el?trica e uma rede padr?o Ethernet. Concentrou-se os dados de leituras das vari?veis dos equipamentos no CLP mestre, este por sua vez ligado a um sistema SCADA. Este SCADA fornece ao operador uma vis?o panor?mica do processo, informando-o em tempo real o comportamento das vari?veis provenientes das etapas do processo, facilitando qualquer interven??o ou mudan?a no sistema. Os dados mais importantes s?o armazenados diariamente em arquivos na esta??o do SCADA, ficando dispon?veis para futuras auditorias ou durante a valida??o anual da planta, comprovando a efic?cia e seguran?a de todo o sistema. / This document propose the adequace of a water treatment station, through the development and implementation of an automation and supervision system for purified water production used in the manufacture of medicines. Water is of fundamental importance in the pharmaceutical industry, it participates in the cleaning processes of materials and surfaces, as well as being used as a carrier in formulations, requiring a series of physicochemical and microbiological specifications. The process of water purification must routinely pass through a strict quality control and must have a concise, automated and efficient industrial process, according to the current legislation. The use of automation networks and supervisory systems is far from novelty in any type of industry, however, in this case, the industrial plant under study did not use these tools. In order to reach the proposed objective, an industrial communication network was implemented between the plant equipments, through a MODBUS default network, an electric current signal instrument network and an Ethernet network. The variables input data of equipaments were concentrated in the master PLC, which was connected to a SCADA system. This SCADA provides the operator with a panoramic view of the process, informing it in real time the behavior of the variables from the process steps, facilitating any intervention or change in the system. The most important data is stored daily in files at the SCADA station, becoming available for future audits or during the annual validation of the station, proving the effectiveness and security of the entire system.