Made available in DSpace on 2016-04-04T18:36:28Z (GMT). No. of bitstreams: 1 Robinson Luz 1.pdf: 1073059 bytes, checksum: 0604a48ed74be248d60095338d576759 (MD5) Previous issue date: 2005-06-28 / This research has as its objective to study the integration of fuzzy logic to data warehouse technologies, having its basis on Information Science theories and practices, it proposes an alternative conceptual model of organization and information retrieval. To develop the model it is described many types of data base in its history file, since its creation up to the data storage known as data warehouse . Regarding the data warehouse , it is showed its architecture, dimension and volatility to show its basis and justify the choice of this kind of database for rendering a comparative study of data recovery using Boolean logic and fuzzy logic . Basic concepts of fuzzy logic , its characteristics, uses and importance to support the decision taking are presented. It is still presented the advantages on using the methods of fuzzy treatment to deal with system that interact with human beings through simulation and thinking. It is presented tests which exemplify the effectiveness degree of data retrieval in data warehouse through Boolean logic and also through fuzzy logic . As a result of this study, it is shown a parameter proposal that will be taken in consideration when integrating the fuzzy logic to data warehouses . / A presente pesquisa tem como objeto de estudo a integra??o da l?gica nebulosa ?s tecnologias de data warehouse . Objetiva, especificamente, propor, com base nas teorias e pr?ticas da Ci?ncia da informa??o, um modelo conceitual alternativo de organiza??o e recupera??o de informa??o.Para o desenvolvimento do modelo s?o descritos diversos tipos de bancos de dados e seu hist?rico, desde sua cria??o at? os armaz?ns de dados chamados data warehouse . Quanto aos data warehouse , s?o expostos sua arquitetura, dimens?es e volatilidade, para fundamentar e justificar a escolha deste tipo de banco de dados para realizar estudo comparativo de recupera??o de dados utilizando-se a l?gica booleana e a l?gica nebulosa . S?o apresentados tamb?m conceitos b?sicos de l?gica nebulosa , suas caracter?sticas, aplica??es e sua import?ncia para auxilio ? tomada de decis?o. S?o apresentadas, ainda, as vantagens do uso de m?todos de tratamento nebuloso para lidar com sistemas que interagem com seres humanos por meio da simula??o de racioc?nios. S?o apresentados testes que exemplificam o grau de efic?cia da recupera??o de dados em data warehouse por meio da l?gica booleana e por meio da l?gica nebulosa . Como resultado do estudo, apresenta-se uma proposta de par?metros que ser?o considerados na integra??o da l?gica difusa aos data warehouses .

Made available in DSpace on 2014-12-17T15:47:50Z (GMT). No. of bitstreams: 1 AndersonPC.pdf: 869261 bytes, checksum: 91e1d275a5e4a9bad4ad9b5124d11a65 (MD5) Previous issue date: 2008-09-26 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Intendding to understand how the human mind operates, some philosophers and psycologists began to study about rationality. Theories were built from those studies and nowadays that interest have been extended to many other areas such as computing engineering and computing science, but with a minimal distinction at its goal: to understand the mind operational proccess and apply it on agents modelling to become possible the implementation (of softwares or hardwares) with the agent-oriented paradigm where agents are able to deliberate their own plans of actions. In computing science, the sub-area of multiagents systems has progressed using several works concerning artificial intelligence, computational logic, distributed systems, games theory and even philosophy and psycology. This present work hopes to show how it can be get a logical formalisation extention of a rational agents architecture model called BDI (based in a philosophic Bratman s Theory) in which agents are capable to deliberate actions from its beliefs, desires and intentions. The formalisation of this model is called BDI logic and it is a modal logic (in general it is a branching time logic) with three access relations: B, D and I. And here, it will show two possible extentions that tranform BDI logic in a modal-fuzzy logic where the formulae and the access relations can be evaluated by values from the interval [0,1] / Com o intuito de entender como a mente humana funciona iniciaram-se estudos sobre cogni??o nos campos da filosofia e psicologia. Teorias surgiram desses estudos e, atualmente, esta curiosidade foi estendida a outras ?reas, tais como, ci?ncia e engenharia de computa??o, no entanto, nestas ?reas, o objetivo ? sutilmente diferente: entender o funcionamento da mente e aplic?-lo em uma modelagem artificial. Em ci?ncia da computa??o, a sub-?rea de sistemas multiagentes tem progredido bastante, utilizando trabalhos em intelig?ncia artificial, l?gica computacional, sistemas distribu?dos, teoria dos jogos e, aproveitando tamb?m teorias provenientes da pr?pria filosofia e psicologia. Desta forma, alguns pesquisadores j? v?em o paradigma de programa??o orientado a agentes como a melhor solu??o para a implementa??o dos softwares mais complexos: cujos sistemas s?o din?micos, n?o-determin?sticos e que podem ter de operar com dados faltosos sobre ambientes tamb?m din?micos e n?o-determin?sticos. Este trabalho busca a apresenta??o de uma extens?o da formaliza??o l?gica de um modelo de arquitetura de agentes cognitivos, chamado BDI (belief-desire-intention), na qual o agente ? capaz de deliberar suas a??es baseando-se em suas cren?as, desejos e inten??es. A formaliza??o de tal modelo ? conhecida pelo nome de l?gica BDI, uma l?gica modal com tr?s rela??es de modalidade. Neste trabalho, ser?o apresentados dois planos para transform?-la numa l?gica modal fuzzy onde as rela??es de acessibilidade e as f?rmulas (modais-fuzzy) poder?o ter valora??es dentro do intervalo [0,1]. Esta l?gica modal fuzzy h? de ser um sistema l?gico formal capaz de representar quantitativamente os diferentes graus de cren?as, desejos e inten??es objetivando a constru??o de racioc?nios fuzzy e a delibera??o de a??es de um agente (ou grupo de agentes), atrav?s dessas atitudes mentais (seguindo assim um modelo intensional)

Data de aprova??o ausente. / Submitted by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2017-06-23T18:47:20Z No. of bitstreams: 2 evandro_jose_oliveira_junior.pdf: 1667432 bytes, checksum: b50071bbf0dbf5cc73187ae78aa09820 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2017-06-26T17:34:17Z (GMT) No. of bitstreams: 2 evandro_jose_oliveira_junior.pdf: 1667432 bytes, checksum: b50071bbf0dbf5cc73187ae78aa09820 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2017-06-26T17:34:17Z (GMT). No. of bitstreams: 2 evandro_jose_oliveira_junior.pdf: 1667432 bytes, checksum: b50071bbf0dbf5cc73187ae78aa09820 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017 / Alguns pa?ses s?o refer?ncia no ensino de computac?o em escolas de ensino b?sico. Isso se deu pelo fato de n?o ensinarem somente ferramentas b?sicas contidas nos computadores, mas tamb?m os fundamentos da Ci?ncia da Computac?o e como eles podem ser aplicados no dia-a-dia. No Brasil praticamente n?o h? ensino de computac?o nas escolas. Com o objetivo de estimular a inserc?o da computac?o na educac?o b?sica do Brasil, este trabalho apresenta v?rias ferramentas de ensino e aprendizagem de programac?o. Discute como essas ferramentas podem ajudar os alunos a desenvolverem caracter?sticas e conhecimentos desej?veis, tanto para a pr?pria computac?o quanto na sua interdisciplinaridade. ? realizada uma an?lise sobre as caracter?sticas de duas dessas ferramentas: Blockly e App Inventor. Al?m disso, s?o apresentados exemplos de uso. Mostra tamb?m uma reflex?o sobre a import?ncia de trabalhar e desenvolver o pensamento cr?tico e o racioc?nio l?gico dos alunos atrav?s da l?gica de programac?o inserida nas escolas. Foi proposto nesta dissertac?o o desenvolvimento de uma plataforma que re?na as principais ferramentas e oriente os alunos e professores sobre como us?-las. Este trabalho busca contribuir para escola, alunos e professores, apresentando ferramentas de ensino que interajam com crian?as e adolescentes, de forma a proporcionar divers?o e estimular a curiosidade. / Disserta??o (Mestrado Profissional) ? Programa de P?s-Gradua??o em Educa??o, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2017. / Some countries are a reference in computer science education in elementary schools. This is due by the fact they are not teaching only basic computers tools, but also computer science fundaments and how they can be applied in their daily life. In Brazil, there is practically no computer science education in schools. With the aim of motivate the insertion of computing science in Brazil?s basic education, this work presents several teaching and learning tools for computer programming. It discusses how these tools can help students to develop characteristics and knowledge desirable, for their own programing skills and also in their interdisciplinary. An analysis is performed on the characteristics of two tools: Blockly and App Inventor. In addition, their usage examples are provided. It also shows a reflection on the importance of developing the student critical and logical thinking using programming logics inserted in schools. It was proposed in this dissertation the development of a platform that brings together the main tools and guides students and teachers on how to use them. This work aims to contribute to school, students and teachers, presenting teaching tools which interacts with children and teenagers, in order to provide fun and stimulate curiosity.

Made available in DSpace on 2014-12-17T14:08:57Z (GMT). No. of bitstreams: 1 RobertoEPB_DISSERT.pdf: 1009635 bytes, checksum: 353b50f5c3e1f13817d981d7d7a2bb6d (MD5) Previous issue date: 2014-08-19 / The petroleum production pipeline networks are inherently complex, usually decentralized systems. Strict operational constraints are applied in order to prevent serious problems like environmental disasters or production losses. This paper describes an intelligent system to support decisions in the operation of these networks, proposing a staggering for the pumps of transfer stations that compose them. The intelligent system is formed by blocks which interconnect to process the information and generate the suggestions to the operator. The main block of the system uses fuzzy logic to provide a control based on rules, which incorporate knowledge from experts. Tests performed in the simulation environment provided good results, indicating the applicability of the system in a real oil production environment. The use of the stagger proposed by the system allows a prioritization of the transfer in the network and a flow programming / As redes de escoamento da produ??o de petr?leo s?o sistemas comumente descentralizados, inerentemente complexos. Restri??es operacionais r?gidas s?o aplicadas para evitar problemas graves, como desastres ambientais ou perdas de produ??o. Este trabalho descreve um sistema inteligente para auxiliar as decis?es na opera??o dessas malhas, propondo um escalonamento das bombas das esta??es de transfer?ncia que a comp?em. O sistema inteligente ? formado por blocos, que se interligam para processar a informa??o e gerar as sugest?es para o operador. O bloco principal do sistema utiliza a l?gica fuzzy para prover um controle baseado em regras, que incorporam o conhecimento de especialistas. Os testes realizados em ambiente de simula??o obtiveram bons resultados, indicando a aplicabilidade do sistema em um ambiente real de produ??o de petr?leo. O uso do escalonamento proposto pelo sistema permite uma prioriza??o da transfer?ncia na rede e uma programa??o do escoamento

Made available in DSpace on 2014-12-17T14:35:50Z (GMT). No. of bitstreams: 1 GiselleCS_tese.pdf: 1424263 bytes, checksum: 0a3b291c39e9d1dfd7f82f5c1ef897a3 (MD5) Previous issue date: 2008-06-13 / The present study has as objective to explaining about the origins of the mathematical logic. This has its beginning attributed to the autodidactic English mathematician George Boole (1815-1864), especially because his books The Mathematical Analysis of Logic (1847) and An Investigation of the Laws of Thought (1854) are recognized as the inaugural works of the referred branch. However, surprisingly, in the same time another mathematician called Augutus of Morgan (1806-1871) it also published a book, entitled Formal Logic (1847), in defense of the mathematic logic. Even so, times later on this same century, another work named Elements of Logic (1875) it appeared evidencing the Aristotelian logic with Richard Whately (1787-1863), considered the better Aristotelian logical of that time. This way, our research, permeated by the history of the mathematics, it intends to study the logic produced by these submerged personages in the golden age of the mathematics (19th century) to we compare the valid systems in referred period and we clarify the origins of the mathematical logic. For that we looked for to delineate the panorama historical wrapper of this study. We described, shortly, biographical considerations about these three representatives of the logic of the 19th century formed an alliance with the exhibition of their point of view as for the logic to the light of the works mentioned above. In this sense, we aspirated to present considerations about what effective Aristotelian?s logic existed in the period of Boole and De Morgan comparing it with the new emerging logic (the mathematical logic). Besides of this, before the textual analysis of the works mentioned above, we still looked for to confront the systems of Boole and De Morgan for we arrive to the reason because the Boole?s system was considered better and more efficient. Separate of this preponderance we longed to study the flaws verified in the logical system of Boole front to their contemporaries' production, verifying, for example, if they repeated or not. We concluded that the origins of the mathematical logic is in the works of logic of George Boole, because, in them, has the presentation of a new logic, matematizada for the laws of the thought similar to the one of the arithmetic, while De Morgan, in your work, expand the Aristotelian logic, but it was still arrested to her / O presente estudo tem como objetivo uma elucida??o das origens da l?gica matem?tica. Esta tem seu in?cio atribu?do ao matem?tico ingl?s autodidata George Boole (1815-1864), especialmente porque seus livros The Mathematical Analysis of Logic (1847) e An Investigation of the Laws of Thought (1854) s?o reconhecidos como as obras inaugurais do referido ramo. Contudo, curiosamente, na mesma ?poca um outro matem?tico chamado Augutus de Morgan (1806-1871) tamb?m lan?ou um livro, intitulado Formal Logic (1847), em defesa da matematiza??o da l?gica. Mesmo assim, tempos depois neste mesmo s?culo, uma outra obra nomeada Elements of Logic (1875) surgiu evidenciando a l?gica aristot?lica a partir da figura de Richard Whately (1787-1863), considerado o maior l?gico aristot?lico da ?poca. Desta forma, nossa pesquisa, permeada pela hist?ria da matem?tica, prop?e estudar a l?gica produzida por estes personagens imersos na idade ?urea da matem?tica (s?culo XIX) a fim de compararmos os sistemas vigentes no referido per?odo e clarificarmos as origens da l?gica matem?tica. Para isso buscamos delinear o panorama hist?rico envolt?rio deste estudo. Descrevemos, brevemente, considera??es biogr?ficas destes tr?s representantes da l?gica do s?culo XIX aliadas ? exposi??o de seus pontos de vista quanto ? l?gica ? luz das obras citadas acima. Neste sentido, aspiramos ainda apresentar considera??es acerca do que existia de l?gica aristot?lica vigente no per?odo de Boole e De Morgan comparando-a com a nova l?gica emergente (a l?gica matem?tica). Al?m disso, diante da an?lise textual das obras citadas acima, buscamos ainda confrontar os sistemas de Boole e De Morgan a fim de chegarmos ao motivo pelo o qual o de Boole ter sido considerado melhor e mais eficiente. ? parte desta preponder?ncia, almejamos estudar as falhas constatadas no sistema l?gico de Boole frente ? produ??o de seus contempor?neos, verificando, por exemplo, se elas se repetiram ou n?o. Conclu?mos que as origens da l?gica matem?tica residem nas obras de l?gica de George Boole, visto que, nelas, h? a apresenta??o de uma nova l?gica, matematizada pelas leis do pensamento an?logas ?s da aritm?tica, enquanto De Morgan conseguiu em seu trabalho expandir a l?gica aristot?lica, mas ainda esteve preso a ela

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-01-20T20:57:18Z No. of bitstreams: 1 AlessandraMendesPachecoGuerraVale_TESE.pdf: 6083940 bytes, checksum: 50490507cf0394240eea06786d58ff08 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-01-21T19:07:52Z (GMT) No. of bitstreams: 1 AlessandraMendesPachecoGuerraVale_TESE.pdf: 6083940 bytes, checksum: 50490507cf0394240eea06786d58ff08 (MD5) / Made available in DSpace on 2016-01-21T19:07:52Z (GMT). No. of bitstreams: 1 AlessandraMendesPachecoGuerraVale_TESE.pdf: 6083940 bytes, checksum: 50490507cf0394240eea06786d58ff08 (MD5) Previous issue date: 2014-12-26 / A detec??o autom?tica de componentes sangu?neos em imagens microsc?picas ? um importante t?pico da ?rea hematol?gica. A segmenta??o permite que os componentes sangu?neos sejam agrupados em ?reas comuns e a classifica??o diferencial dos leuc?citos possibilita que os mesmos sejam analisados separadamente. Com a segmenta??o autom?tica e classifica??o diferencial, contribui-se no processo de an?lise dos componentes sangu?neos, fornecendo ferramentas que propiciem a diminui??o do trabalho manual e o aumento da sua precis?o e efici?ncia. Utilizando t?cnicas de processamento digital de imagens associadas a uma abordagem fuzzy gen?rica e autom?tica, este trabalho apresenta dois Sistemas de Infer?ncia Fuzzy, definidos como I e II, para a segmenta??o autom?tica de componentes sangu?neos e classifica??o diferencial de leuc?citos, respectivamente, em imagens microsc?picas de esfrega?os. Utilizando o Sistema de Infer?ncia Fuzzy I, a t?cnica desenvolvida realiza a segmenta??o da imagem em quatro regi?es: n?cleo e citoplasma leucocit?rios, eritr?citos e ?rea de plasma e utilizando o Sistema de Infer?ncia Fuzzy II e os leuc?citos segmentados (n?cleo e citoplasma leucocit?rios), os classifica diferencialmente em cinco tipos: bas?filos, eosin?filos, linf?citos, mon?citos e neutr?filos. Foram utilizadas para testes 530 imagens contendo amostras microsc?picas de esfrega?os sangu?neos corados com m?todos variados. As imagens foram processadas e seus ?ndices de Acur?cia e Gold Standards foram calculados e comparados com os resultados manuais e com outros resultados encontrados na literatura para os mesmos problemas. Quanto ? segmenta??o, a t?cnica desenvolvida demonstrou percentuais de acur?cia de 97,31% para leuc?citos, 95,39% para eritr?citos e 95,06% para plasma sangu?neo. Quanto ? classifica??o diferencial, os percentuais variaram entre 92,98% e 98,39% para os diferentes tipos leucocit?rios. Al?m de promover a segmenta??o autom?tica e classifica??o diferencial, a t?cnica desenvolvida contribui ainda com defini??o de novos descritores e a constru??o de um banco de imagens utilizando diversos processos de colora??o hematol?gicos / Automatic detection of blood components is an important topic in the field of hematology. The segmentation is an important stage because it allows components to be grouped into common areas and processed separately and leukocyte differential classification enables them to be analyzed separately. With the auto-segmentation and differential classification, this work is contributing to the analysis process of blood components by providing tools that reduce the manual labor and increasing its accuracy and efficiency. Using techniques of digital image processing associated with a generic and automatic fuzzy approach, this work proposes two Fuzzy Inference Systems, defined as I and II, for autosegmentation of blood components and leukocyte differential classification, respectively, in microscopic images smears. Using the Fuzzy Inference System I, the proposed technique performs the segmentation of the image in four regions: the leukocyte?s nucleus and cytoplasm, erythrocyte and plasma area and using the Fuzzy Inference System II and the segmented leukocyte (nucleus and cytoplasm) classify them differentially in five types: basophils, eosinophils, lymphocytes, monocytes and neutrophils. Were used for testing 530 images containing microscopic samples of blood smears with different methods. The images were processed and its accuracy indices and Gold Standards were calculated and compared with the manual results and other results found at literature for the same problems. Regarding segmentation, a technique developed showed percentages of accuracy of 97.31% for leukocytes, 95.39% to erythrocytes and 95.06% for blood plasma. As for the differential classification, the percentage varied between 92.98% and 98.39% for the different leukocyte types. In addition to promoting auto-segmentation and differential classification, the proposed technique also contributes to the definition of new descriptors and the construction of an image database using various processes hematological staining

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-20T22:02:47Z No. of bitstreams: 1 AntonioHigorFreireDeMorais_TESE.pdf: 1781383 bytes, checksum: 12a1bd589f80bcd6303ef2f9725860f1 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-21T20:58:48Z (GMT) No. of bitstreams: 1 AntonioHigorFreireDeMorais_TESE.pdf: 1781383 bytes, checksum: 12a1bd589f80bcd6303ef2f9725860f1 (MD5) / Made available in DSpace on 2016-07-21T20:58:48Z (GMT). No. of bitstreams: 1 AntonioHigorFreireDeMorais_TESE.pdf: 1781383 bytes, checksum: 12a1bd589f80bcd6303ef2f9725860f1 (MD5) Previous issue date: 2015-11-20 / A Esclerose Lateral Amiotr?fica (ELA) ? uma doen?a neurodegenerativa caracterizada pela fraqueza muscular progressiva que leva o paciente ? morte, geralmente devido a complica??es respirat?rias. Assim, ao passo que a doen?a progride o paciente precisar? de ventila??o n?o-invasiva (VNI) e monitoramento constante. Esta tese apresenta uma arquitetura distribu?da para monitoramento domiciliar de ventila??o noturna n?o-invasiva (VNNI) em pacientes com ELA. A implementa??o desta arquitetura utilizou um computador de placa ?nica (Single Board Computer) e dispositivos m?veis localizados na casa do paciente para mostrar mensagens de alerta para os cuidadores do paciente e um servidor web para monitoramento remoto pela equipe de sa?de. A arquitetura utilizou um software baseado em l?gica fuzzy e vis?o computacional para capturar os dados da tela do ventilador mec?nico e gerar mensagens de alerta com instru??es para os cuidadores. O experimento de monitoramento foi realizado com 29 pacientes por 7 horas cont?nuas diariamente durante 5 dias gerando um total de 126000 amostras para cada vari?vel monitorada com uma taxa de amostragem de uma amostra por segundo. A arquitetura do sistema foi avaliada com rela??o a taxa de acerto para reconhecimento de caracteres e respectiva corre??o atrav?s de um algoritmo para detec??o e corre??o de erros. Al?m disso, a equipe de sa?de avaliou o sistema com rela??o aos intervalos de tempo em as mensagens de alertas foram geradas e se as estas estavam corretas. Dessa forma, o sistema apresentou uma m?dia geral de acertos de 98,72%, e no pior caso 98,39%. Quanto ?s mensagens a serem geradas, o sistema tamb?m concordou em 100% com a avalia??o geral, tendo havido discord?ncia em apenas dois casos com um dos avaliadores. / The Amyotrophic Lateral Sclerosis (ALS) is a neurodegenerative disease characterized by progressive muscle weakness that leads the patient to death, usually due to respiratory complications. Thus, as the disease progresses the patient will require noninvasive ventilation (NIV) and constant monitoring. This paper presents a distributed architecture for homecare monitoring of nocturnal NIV in patients with ALS. The implementation of this architecture used single board computers and mobile devices placed in patient?s homes, to display alert messages for caregivers and a web server for remote monitoring by the healthcare staff. The architecture used a software based on fuzzy logic and computer vision to capture data from a mechanical ventilator screen and generate alert messages with instructions for caregivers. The monitoring was performed on 29 patients for 7 con-tinuous hours daily during 5 days generating a total of 126000 samples for each variable monitored at a sampling rate of one sample per second. The system was evaluated regarding the rate of hits for character recognition and its correction through an algorithm for the detection and correction of errors. Furthermore, a healthcare team evaluated regarding the time intervals at which the alert messages were generated and the correctness of such messages. Thus, the system showed an average hit rate of 98.72%, and in the worst case 98.39%. As for the message to be generated, the system also agreed 100% to the overall assessment, and there was disagreement in only 2 cases with one of the physician evaluators.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-26T20:55:55Z No. of bitstreams: 1 PhilippeEduardoDeMedeiros_DISSERT.pdf: 9213681 bytes, checksum: 456aa340b29b57fa922a34d7d76e21bf (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-08T23:12:13Z (GMT) No. of bitstreams: 1 PhilippeEduardoDeMedeiros_DISSERT.pdf: 9213681 bytes, checksum: 456aa340b29b57fa922a34d7d76e21bf (MD5) / Made available in DSpace on 2016-08-08T23:12:13Z (GMT). No. of bitstreams: 1 PhilippeEduardoDeMedeiros_DISSERT.pdf: 9213681 bytes, checksum: 456aa340b29b57fa922a34d7d76e21bf (MD5) Previous issue date: 2016-03-01 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Estruturas e sistemas inteligentes tem como principal caracter?stica a capacidade de emular o comportamento de organismos vivos, os quais possuem comportamento autorregulado. Deste modo, devido a presen?a de um mecanismo de est?mulo-resposta, este tipo de estrutura possui propriedades adaptativas. O termo estrutura inteligente vem sendo usado para identificar sistemas estruturais capazes de modificar sua geometria e/ou propriedades f?sicas no intuito de executar determinada tarefa. Neste trabalho, um controlador por modos deslizantes com compensa??o difusa ? empregado para o controle ativo de vibra??es em uma treli?a de Von Mises feita de liga com mem?ria de forma. Este sistema possui uma din?mica bastante rica e complexa, podendo apresentar comportamento ca?tico mesmo quando submetido a carregamentos de frequ?ncias moderadas. Simula??es num?ricas s?o apresentadas para comprovar a efic?cia da estrat?gia utilizada. / Smart structures and systems have the main purpose to mimic living organisms, which are essentially characterized by an autoregulatory behavior. Therefore, this kind of structure has adaptive characteristics with stimulus-response mechanisms. The term adaptive structure has been used to identify structural systems that are capable of changing their geometry or physical properties with the purpose of performing a specific task. In this work, a sliding mode controller with fuzzy inference is applied for active vibration control in an SMA two-bar truss. In order to obtain a simpler controller, a polynomial model is used in the control law, while a more sophisticated version, which presents close agreement with experimental data, is applied to describe the SMA behavior of the structural elements. This system has a rich dynamic response and can easily reach a chaotic behavior even at moderate loads and frequencies. Therefore, this approach has the advantage of not only obtaining a simpler control law, but also allows its robustness be evidenced. Numerical simulations are carried out in order to demonstrate the control system performance.

Made available in DSpace on 2014-12-17T14:53:05Z (GMT). No. of bitstreams: 1 EvertonS_DISSERT.pdf: 1215528 bytes, checksum: 9fd0b2ab4c831dc0b107eb1bed7bb87b (MD5) Previous issue date: 2012-01-27 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / This work presents a hybrid approach for the supplier selection problem in Supply Chain Management. We joined decision-making philosophy by researchers from business school and researchers from engineering in order to deal with the problem more extensively. We utilized traditional multicriteria decision-making methods, like AHP and TOPSIS, in order to evaluate alternatives according decision maker s preferences. The both techiniques were modeled by using definitions from the Fuzzy Sets Theory to deal with imprecise data. Additionally, we proposed a multiobjetive GRASP algorithm to perform an order allocation procedure between all pre-selected alternatives. These alternatives must to be pre-qualified on the basis of the AHP and TOPSIS methods before entering the LCR. Our allocation procedure has presented low CPU times for five pseudorandom instances, containing up to 1000 alternatives, as well as good values for all considered objectives. This way, we consider the proposed model as appropriate to solve the supplier selection problem in the SCM context. It can be used to help decision makers in reducing lead times, cost and risks in their supply chain. The proposed model can also improve firm s efficiency in relation to business strategies, according decision makers, even when a large number of alternatives must be considered, differently from classical models in purchasing literature / Este trabalho apresenta uma abordagem h?brida para o problema de sele??o de fornecedores em cadeias de suprimentos geridas com base na metodologia SCM (do ingl?s, Supply Chain Management). Busca-se combinar as filosofias de avalia??o tradicionalmente adotadas pelos pesquisadores oriundos da escola de neg?cios e pelos pesquisadores oriundos da ?rea de engenharia, esta ?ltima baseada em otimiza??o, para o trato do problema. Para tal, utilizam-se t?cnicas multicrit?rios tradicionais, como os m?todos AHP e TOPSIS para avaliar as alternativas segundo a prefer?ncia dos decisores. Ambas as t?cnicas s?o modeladas de maneira a suportar defini??es da Teoria dos Conjuntos Fuzzy, tratando-se assim informa??es imprecisas. Adicionalmente, apresenta-se um algoritmo GRASP, com base em m?ltiplos objetivos, para a aloca??o de pedidos entre as alternativas pr?-selecionadas por meio dos m?todos supracitados. Este algoritmo, por sua vez, apresenta tempos de CPU relativamente baixos para cinco inst?ncias pseudo-aleat?rias, contendo entre 20 e 1000 alternativas, bem como valores pr?ximos aos valores m?nimos para cada um dos objetivos considerados. Destaca-se que o modelo proposto se mostrou apropriado para a avalia??o de fornecedores no contexto apresentado, podendo-se auxiliar os decisores na redu??o de lead times, custos e riscos de sua cadeia de suprimentos, bem como na melhoria da efici?ncia desta estrutura em rela??o ? sua vis?o de neg?cios, mesmo quando um n?mero elevado de alternativas ? considerado, diferentemente dos modelos cl?ssicos apresentados na literatura

Made available in DSpace on 2014-12-17T14:54:54Z (GMT). No. of bitstreams: 1 AlexandreMFG_TESE.pdf: 5334818 bytes, checksum: 7c848d27061280b40eb07e9232cb9807 (MD5) Previous issue date: 2009-08-28 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The traditional processes for treatment of hazardous waste are questionable for it generates other wastes that adversely affect people s health. As an attempt to minimize these problems, it was developed a system for treatment of hazardous waste by thermal plasma, a more appropriate technology since it produces high temperatures, preventing the formation of toxic pollutants to human beings. The present work brings out a solution of automation for this plant. The system has local and remote monitoring resources to ensure the operators security as well as the process itself. A special attention was given to the control of the main reactor temperature of the plant as it is the place where the main processing occurs and because it presents a complex mathematical model. To this, it was employed cascaded controls based on Fuzzy logic. A process computer, with a particular man-machine interface (MMI), provides information and controls of the plant to the operator, including by Internet. A compact PLC module is in charge of the central element of management automation and plant control which receives information from sensors, and sends it to the MMI / Os processos tradicionais de tratamento de lixos perigosos s?o question?veis por gerar outros res?duos que afetam negativamente ? sa?de das pessoas. Como tentativa de minimiza??o desses problemas foi desenvolvido um sistema de tratamento de res?duos perigosos por plasma t?rmico, uma tecnologia adequada por produzir altas temperaturas, impedindo a forma??o de poluentes bastantes t?xicos ao homem. O trabalho aqui exposto traz uma solu??o de automa??o para essa planta. O sistema disp?e de recursos de monitoramento e prote??es locais e remotos, que garantem a seguran?a do processo e dos operadores. Para controle de temperatura do reator principal da planta foi dada uma aten??o especial por ser o recinto onde ocorre o principal processamento e por apresentar um complexo modelo matem?tico. Para esse fim, foram empregados controles em cascata baseados em l?gica Fuzzy. Um computador de processo, com uma interface homem-m?quina (IHM) espec?fica, disponibiliza ao operador informa??es e controles da planta, inclusive via Internet. O elemento central de gerenciamento da automa??o e controle da planta fica a cargo de um m?dulo CLP compacto, que recebe as informa??es dos sensores, e as envia ? IHM