Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-10-18T19:39:54Z No. of bitstreams: 1 FabriciaAbrantesFigueiredoDaRocha_TESE.pdf: 19217116 bytes, checksum: 6d69e78fd538a60d18af67172b2fe67f (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-10-19T20:32:05Z (GMT) No. of bitstreams: 1 FabriciaAbrantesFigueiredoDaRocha_TESE.pdf: 19217116 bytes, checksum: 6d69e78fd538a60d18af67172b2fe67f (MD5) / Made available in DSpace on 2017-10-19T20:32:05Z (GMT). No. of bitstreams: 1 FabriciaAbrantesFigueiredoDaRocha_TESE.pdf: 19217116 bytes, checksum: 6d69e78fd538a60d18af67172b2fe67f (MD5) Previous issue date: 2017-07-27 / O Efeito Chicote (EC) ? um fen?meno presente nas cadeias de suprimentos caracterizado pela variabilidade da demanda, ocasionando uma amplifica??o a montante das quantidades movimentadas, implicando na forma??o de estoques em excesso e, consequentemente, na eleva??o dos custos log?sticos. H? consenso nos estudos anteriores quanto ? defini??o e ?s causas que origina o EC. No entanto, os modelos propostos para a quantifica??o e o desenvolvimento de solu??es para a mitiga??o do EC ainda constituem um amplo campo de pesquisa, face as lacunas identificadas na literatura, a exemplo de an?lises que contemplem composto de Marketing, capacidade de transporte, sazonalidade e custos. Desse modo, este trabalho tem como objetivo desenvolver um modelo de apoio ? gest?o de cadeias de suprimentos para avaliar o impacto que a??es de Marketing, desenvolvidas em per?odos delimitados de tempo para estimular a comercializa??o dos produtos, exercem no EC. O racionamento no fornecimento, o lead time e o estoque m?nimo, que s?o agentes causadores da variabilidade da demanda, al?m da diferencia??o dos itens segundo a classifica??o ABC, foram considerados na estrutura??o do modelo. O estudo, ent?o, pode ser enquadrado como explorat?rio, descritivo e explicativo. Quanto a abordagem, a pesquisa assume um car?ter qualitativo e quantitativo, de natureza aplicada, mediante o levantamento de dados junto a uma empresa atuante no varejo da constru??o civil, para auxiliar na identifica??o de valores de refer?ncia para validar o modelo proposto. Para viabilizar o estudo, diante da complexidade decorrente do relacionamento entre as vari?veis envolvidas, foi utilizada como ferramenta a simula??o, a partir da Din?mica de Sistemas (DS), pois trata-se de um ambiente controlado, possibilitando a replica??o com facilidade dos experimentos, viabilizando a constru??o de cen?rios e favorecendo an?lises, cujos resultados auxiliam o processo de tomada de decis?o. As simula??es executadas, respaldadas nas refer?ncias bibliogr?ficas, permitiram atestar que o resgate do saldo de fornecimento na composi??o do pedido de compra reduz significativamente o EC; a presen?a de mais canais de distribui??o elevam o EC; o estabelecimento de pontos m?nimo e m?ximo para o estoque, em conformidade com a classifica??o ABC, permite reduzir o EC, dada a representatividade dos itens; a avalia??o dos n?veis de estoque e dos saldos de fornecimento atuam como elementos reguladores, podendo acarretar na redu??o do EC; e a pr?tica de calend?rios de promo??o e de racionamento do fornecimento incidem no aumento do EC. Conclui-se que o modelo proposto ? capaz de mitigar o EC na cadeia de suprimentos. / The bullwhip effect (BE) is a phenomenon present in the supply chains characterized by the variability of the demand, causing an amplification upstream of the quantities handled, implying in the formation of excess stocks and, consequently, in the increase of logistic costs. There is consensus in previous studies regarding the definition and causes of BE. However, the proposed models for the quantification and development of solutions for BE mitigation still constitute a broad field of research, given the gaps identified in the literature, such as analyzes that contemplate the composition of Marketing, transport capacity, seasonality and costs. Thus, the objective of that work is to develop a support model for the management of supply chains to evaluate the impact that Marketing actions, carried out in defined periods of time to stimulate the commercialization of the products, exercise in the BE. Supply rationing, lead time and minimum inventory, which are agents that cause variability in demand, besides the differentiation of items according to the ABC classification, were considered in the model structuring. The study, then, can be classified as exploratory, descriptive and explanatory. Regarding the approach, the research assumes a qualitative and quantitative nature, of an applied nature, through the collection of data from a company that operates in the retail of civil construction, to assist in the identification of reference values to validate the proposed model. In order to make the study feasible, due to the complexity resulting from the relationship between the variables involved, it was used as a tool the simulation, from the System Dynamics (SD), because it is a controlled environment, allowing the replication with ease of the experiments, enabling the construction of scenarios and favoring analyzes, the results of which help the decision-making process. The simulations carried out, supported by bibliographical references, allowed us to confirm that the redemption of the supply balance in the purchase order composition significantly reduces the BE; the presence of more distribution channels elevates the BE; the establishment of minimum and maximum points for the stock, in accordance with the ABC classification, allows to reduce the BE, given the representativeness of the items; the evaluation of stock levels and supply balances act as regulatory elements, which may lead to the reduction of the BE; and the practice of promotion and supply rationing calendars focus on increasing the BE. It is concluded that the proposed model is able to mitigate the BE in the supply chain.

Made available in DSpace on 2014-12-17T14:53:15Z (GMT). No. of bitstreams: 1 AntonioRAM_DISSERT.pdf: 4031377 bytes, checksum: f586d0a4b0cb27f132711521104ada96 (MD5) Previous issue date: 2013-03-19 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The importance of the airport sector in the development of a country refers to the need for studies on management of airports, to aid the process of decision making. In Brazil, growth in passenger demand is why investments in order to balance the capacity of an airport with air demand. Thus, the study aims to develop a model for Dynamic Systems able to assist airport management in Brazilian sizing subsystems an airport (Passenger Terminal, Runway and Patio). The methodology of this work consists in the steps of defining the problem, formulating the hypothesis dynamic building simulation model, and validation experiments. Finally, we examined the status of each subsystem in thirteen Brazilian airports in scenarios current, most likely and optimistic for air passenger demand / A import?ncia do setor a?reo no desenvolvimento de um pa?s nos remete a necessidade da realiza??o de estudos sobre gerenciamento de aeroportos, visando auxiliar o processo de tomada de decis?es. No Brasil, o crescimento da demanda de passageiros ? motivo de investimentos com intuito de equilibrar a capacidade de um aeroporto com a demanda a?rea. Diante disso, o trabalho tem como objetivo desenvolver um modelo em Din?mica dos Sistemas capaz de auxiliar a gest?o aeroportu?ria brasileira no dimensionamento dos subsistemas de um aeroporto (Terminal de Passageiros, Pista e P?tio). A metodologia do trabalho consistiu nas etapas de defini??o do problema, formula??o da hip?tese din?mica, constru??o do modelo de simula??o, valida??o e experimentos. Por fim, analisou a situa??o de cada subsistema em treze aeroportos brasileiros nos cen?rios atual, mais prov?vel e otimista para a demanda a?rea de passageiros