Orientador: Paulo C. Lima / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica / Made available in DSpace on 2018-08-03T20:26:47Z (GMT). No. of bitstreams: 1 Silva_WeiderRobeson_M.pdf: 7519560 bytes, checksum: 2335738538c400a80fa54c593e74c54f (MD5) Previous issue date: 2003 / Resumo: Este estudo é resultado de um trabalho de revisão de processos numa empresa fabricante de elevadores, intitulado BPR ou em inglês Business Process Review. São explorados, conceitos e ferramentas para aplicação em um estudo de caso numa empresa fabricante de elevadores. O problema central é o processo de orçamentação de produtos altamente configuráveis na linha de negócio de Modernização, que sofre de atrasos, falta de controle e custos decorrentes de erros de processo. Com a aplicação de técnicas adequadas de Manufatura Enxuta e Gestão de Projetos, o Processo de orçamentação é redesenhado e implementado. O método de desenvolvimento desta mudança no processo é escopo deste trabalho e bem como a verificação dos resultados da implementação / Abstract: This study is result of a business process review performed in elevator manufacturing company. Herein are investigated concepts and tools for BPR application in a Case Study. The main issues are: delays, extra-costs, lack of process control due to non structured process along the bidding process of highlycustomizableproductsusedin a businessline called Modernization. Through Lean Manufac turing and Project Management techniques, the bidding process was reviewed and implemented. The development method to implement the change is scope of this study as well results verificationafier the implementation / Mestrado / Materiais e Processos de Fabricação / Doutor em Engenharia Mecânica

This thesis concerns with problematic of FX risk management in a mid-sized export-oriented company. The theoretic part of the paper explains fundamental and origin of FX risk and summarizes process of its management with emphasis on specifics of mid-sized companies. Further, selected hedging techniques and instruments are introduced. With employment of available statistics and analysis, main advantages and disadvantages of hedging are demonstrated. For practical application of theory presented, real data from mid-sized company are used. After analyzing financial and accounting statements, concrete risks arising from exchange rate volatility are identified. Finally, concrete recommendations for the management are offered, which could lead to lowering FX exposure and reducing impact of changes in exchange rates on economy of the firm.

Ce travail de thèse s'inscrit dans le cadre d'un projet de recherche entre le CEA et ARMINES (Centre LGEI/ Ecole des Mines d'Alès). Il vise à améliorer la connaissance des mécanismes physiques se produisant lorsque qu’une nappe de liquide (inflammable et/ou toxique stocké à pression atmosphérique) s’évapore suite à la rupture de son stockage. La démarche expérimentale employée consiste à réaliser un plan d'expériences visant à exprimer le débit d'évaporation initial d’une nappe sous différentes conditions initiales de température de liquide et de sol, sous différentes vitesse d’écoulement, de température d’air et selon différentes épaisseurs initiales de liquide. Les différents flux thermiques échangés entre la nappe et son environnement, la température de la nappe et le débit d'évaporation sont mesurés et quantifiés.Les débits d'évaporation expérimentaux sont confrontés à ceux prédits par les différentes corrélations disponibles dans la littérature. Deux analyses de sensibilité sont également réalisées sur ces corrélations et les résultats confrontés à ceux du plan d'expériences afin de vérifier si les corrélations attribuent le même poids aux différents paramètres expérimentaux que le phénomène en lui-même.Les relevés de température dans l'épaisseur de la nappe mettant en évidence la présence de cellules de convection naturelle est également étudiée. Par ailleurs, la température moyenne de la surface est déterminée à partir des différents flux thermiques échangés entre la nappe et son environnement.A l'aide des résultats obtenus, l'étude de plusieurs éléments a été réalisée: l’écart de prédiction sur les résultats des équations bilan thermique et massique selon la température employée pour les incrémenter, la nette différence de température entre la surface et le coeur du liquide, rarement prise en compte dans les modèles théoriques, le rôle prépondérant de la convection naturelle dans le phénomène d'évaporation.Un dernier chapitre étudie la dispersion de la température de surface (phénomène peu étudié dans la littérature) à l'aide d'une caméra thermique. Des zones de températures homogènes apparaissent alors dans le cas de l'essai mettant en oeuvre un écoulement de cavité au-dessus du liquide. La présence de différentes zones de température implique que la cinétique d’évaporation n’est pas uniforme sur la surface de la nappe. A partir de ces résultats, le coefficient de transfert de matière est étudié en fonction de la régression du niveau de liquide dans le bac et conclut à une diminution non modélisée par les corrélations existantes. / This work belongs to a research project between CEA and ARMINE (LGEI center/ Ecole des Mines d’Alès). It aims at increasing comprehension of physical mechanism generating when a liquid pool (either flammable or toxic parked under atmospheric pressure) evaporates after loss of containment. An experimental design is realized in order to express some characteristics of evaporation phenomena (initial evaporation rate, steady evaporation rate and duration of unsteady evaporation rate) as a function of initial liquid and soil temperature, wind velocity, air temperature and initial liquid thickness. Heat fluxes exchanged between the pool and its environment are either measure or computed.Experimental evaporation rates are compared to those predicted by correlations available in the literature. Two sensitivity analyses are performed and their results are confronted to those from experimental design. It allows determining if the importance of the different experimental parameters is the same from the correlations to the phenomena itself.Temperature measurements in liquid thickness highlight the presence of natural convection cells. Besides, mean surface temperature is computed from measurements of heat fluxes exchanged between the pool and its environment. From the different results, several points are investigated: the shift between heat and mass balance equations according to the temperature employed to compute them the difference between the liquid bulk and liquid surface temperature, barely taken into account in correlations the noteworthy role of natural convection in the evaporation phenomena.A last chapter studies the surface temperature distribution thanks to an infrared thermometer. Homogeneous temperatures areas appear in the case of cavity flows. The presence of different temperature areas implies that evaporation kinematic in not uniform in the whole surface. From these result the mass transfer coefficient is studied as a function of the step height between the top of the cavity and the liquid surface. It concludes to a mass transfer coefficient decrease non modeled by the different correlations in the literature.