Made available in DSpace on 2016-05-02T13:54:04Z (GMT). No. of bitstreams: 1 WilliamJuniodoCarmo-Dissertacao.pdf: 1125574 bytes, checksum: 4ac2916c6500781f636c1d1857a2db90 (MD5) Previous issue date: 2011-11-19 / This paper evaluated the benchmarking of milk production with a survey of data in the state of Minas Gerais and the city of Bambuí, MG. The analysis was performed within an intensive production system with animals on pasture, with the purpose of surveying milk production in Bambuí to establish differences in productivity, competitiveness and sustainability of farms which are benchmarks of the city and state. The data and the samples of the research were submitted to the internal and external benchmarking technique for assaying the variables. Differences of performance in productivity were observed by benchmarking several milk production units in Bambuí and Minas Gerais. In face of the characteristics of the benchmarking units of the city in relation to the state, this study showed that the milk productive chain of the city in relation to the state and the country is economically competitive and sustainable, despite the significant decrease in the number of milk producers in the Bambuí region. / O presente trabalho teve como objetivo a avaliação de benchmarking da produção de leite, com o levantamento de dados no estado de Minas Gerais e no município da cidade de Bambuí/MG. A análise foi feita dentro de um sistema de produção intensivo com animais em pastejo, com o objetivo de levantar a produção de leite no município de Bambuí, dimensionando as diferenças de produtividade, a competitividade e a sustentabilidade da exploração pelos estabelecimentos, que são benchmarks do município e do estado. A partir dos dados levantados e as amostras da pesquisa, utilizou-se a técnica do benchmarking, interno e externo, para levantamento das variáveis. Constatam-se diferenças de desempenho em termos de produtividade através do benchmarking entre as diversas unidades produtoras de leite no município de Bambuí e Minas Gerais. Em virtude das características das unidades benchmarking do município de Bambuí e do estado, o estudo demonstrou que a produção da cadeia produtiva de leite do município em relação ao estado e em linha o Brasil, é economicamente competitiva e sustentável apesar da grande diminuição do número de produtores de leite dentro da região do município.

The global value creation networks have experienced increased volatility and dynamic behavior in recent years, resulting in an acceleration of a trend already evident in the shortening of product and technology cycles. In addition, the manufacturing industry is demonstrating a trend of allowing customers to make specific adjustments to their products at the time of ordering. Not only do these changes require a high level of flexibility and adaptability from the cyber-physical systems, but also from the employees and the supervisory production planning. As a result, the development of control and monitoring mechanisms becomes more complex. It is also necessary to adjust the production process dynamically if there are unforeseen events (disrupted supply chains, machine breakdowns, or absences of staff) in order to make the most effective and efficient use of the available production resources. In recent years, reinforcement learning (RL) research has gained increasing popularity in strategic planning as a result of its ability to handle uncertainty in dynamic environments in real time. RL has been extended to include multiple agents cooperating on complex tasks as a solution to complex problems. Despite its potential, the real-world application of multi-agent reinforcement learning (MARL) to manufacturing problems, such as flexible job-shop scheduling, has been less frequently approached. The main reason for this is most of the applications in this field are frequently subject to specific requirements as well as confidentiality obligations. Due to this, it is difficult for the research community to obtain access to them, which presents substantial challenges for the implementation of these tools. ...

Submitted by Liliane Ferreira (ljuvencia30@gmail.com) on 2018-07-18T13:36:22Z No. of bitstreams: 2 Dissertação - Christiano Michel Fernandes Freitas - 2018.pdf: 3053695 bytes, checksum: 0d910878cf5ec6ac8091d4ef7816758e (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-07-18T15:20:11Z (GMT) No. of bitstreams: 2 Dissertação - Christiano Michel Fernandes Freitas - 2018.pdf: 3053695 bytes, checksum: 0d910878cf5ec6ac8091d4ef7816758e (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2018-07-18T15:20:11Z (GMT). No. of bitstreams: 2 Dissertação - Christiano Michel Fernandes Freitas - 2018.pdf: 3053695 bytes, checksum: 0d910878cf5ec6ac8091d4ef7816758e (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2018-05-18 / This work proposes the modeling of a production system with three manufacturing units, in order to allow the optimal dimensioning of maintainers and the accomplishment of a sensitivity analysis that allows to evaluate the reliability of the obtained results. A Quasi-Birthand- Death (QBD) process is used to model the productive units, and through infinitesimal generators, the input probabilities for the developed code are obtained. Organizations usually define their supporter teams empirically, which can compromise organizational strategies. Thus, the code offers assistance in the decision making of these professionals. Thus, three production units X, Y and Z were modeled and the minimum dimensioning of maintainers that each unit had to be performed. Thus, the X unit with two maintainers provides a 70% probability of remaining in operation, the Y unit with three provides 76%, and finally, the Y unit with only one maintainer allows an 80% chance of remaining in operation. Bymeans of the sensitivity analysis, it was noticed thatwhen disturbing the infinitesimal generator the values of probability of operation tend to approximate to 100% whereas a maintainer is added, however, when the fourth maintainer is added, there is little variation in the system. However,when the system is stressed by the growth of the randomvariable t, the reliability of the results tends to decrease, whereas with a maintainer, the probability of functioning falls considerably over time, and in contrast, with four maintainers, the permanence of operating state tends to be distant. / O presente trabalho tem como objetivos: modelar um sistema de produção com três unidades fabris, de modo a permitir o dimensionamento ideal de mantenedores, e a realização de uma análise de sensibilidade para avaliar a confiabilidade dos resultados obtidos pelo mesmo modelo. Um processo de quase nascimento e morte (Quasi-Birth-and-Death - QBD) é utilizado para modelar as unidades produtivas, e por meio dos geradores infinitesimais, são obtidas as probabilidades de entrada para o código desenvolvido. Geralmente as organizações definem suas equipes de mantenedores de forma empírica, fato que pode comprometer as estratégias organizacionais. Sendo assim, o código oferece auxílio na tomada de decisões destes profissionais. Deste modo, foram modeladas três unidades de produção X, Y e Z e realizado o dimensionamento mínimo de mantenedores que cada unidade deve ter. Observou-se que a unidade X com no mínimo dois mantenedores proporciona 70% de probabilidade de permanecer em funcionamento, a unidade Y com três, proporciona 76%, e a unidade Z, com um mantenedor, possibilita 80%. Por meio da análise de sensibilidade, notou-se que ao perturbar o gerador infinitesimal os valores de probabilidade de funcionamento tendem a se aproximar de 100% à medida que se acrescenta um mantenedor, no entanto, quando se acrescenta o quarto mantenedor, existe pouca variação no sistema. Já em relação ao tempo, quando se estressa o sistema por meio do crescimento da variável aleatória t , a confiabilidade dos resultados tende a diminuir, sendo que com um mantenedor, a probabilidade de funcionamento cai consideravelmente ao longo do tempo, e em contrapartida, com quatro mantenedores, a permanência de estado de funcionamento tende a ser duradoura.