Suchergebnisse

Cet essai met en avant le rôle essentiel des organisations commerciales et coloniales dans la circulation de l'écrit à l'échelle du monde. Pour mettre au jour cette histoire commune entre histoire de la culture écrite et celle de l'expansion européenne, cet essai propose une série d'explorations autour des pratiques scripturaires de la Compagnie hollandaise des Indes orientales fondée en 1602

Predictive maintenance strategies can help reduce the ever-growing maintenance costs, but their implementation represents a major challenge. Indeed, it requires to evaluate the health state of the component of the system and to prognosticate the occurrence of a future failure. This second step consists in estimating the remaining useful life (RUL) of the components, in Other words, the time they will continue functioning properly. This RUL estimation holds a high stake because the precision and accuracy of the results will influence the relevance and effectiveness of the maintenance operations. Many methods have been developed to prognosticate the remaining useful life of a component. Each one has its own particularities, advantages and drawbacks. The present work proposes a general methodology for component RUL estimation. The objective i to develop a method that can be applied to many different cases and situations and does not require big modifications. Moreover, several types of uncertainties are being dealt With in order to improve the accuracy of the prognostic. The proposed methodology can help in the maintenance decision making process. Indeed, it is possible to select the optimal moment for a required intervention thanks to the estimated RUL. Furthermore, dealing With the uncertainties provides additional confidence into the prognostic results. ; La mise en place d'une politique de maintenance prévisionnelle est un défi majeur dans l'industrie qui tente de réduire le plus possible les frais relatifs à la maintenance. En effet, les systèmes sont de plus en plus complexes et demandent un suivi de plus en plus poussé afin de rester opérationnels et sécurisés. Une maintenance prévisionnelle nécessite d'une part d'évaluer l'état de dégradation des composants du système, et d'autre part de pronostiquer l'apparition future d'une panne. Plus précisément, il s'agit d'estimer le temps restant avant l'arrivée d'une défaillance, aussi appelé Remaining Useful Life ou RUL en anglais. L'estimation d'une RUL constitue un réel enjeu car la pertinence et l'efficacité des actions de maintenance dépendent de la justesse et de la précision des résultats obtenus. Il existe de nombreuses méthodes permettant de réaliser un pronostic de durée de vie résiduelle, chacune avec ses spécificités, ses avantages et ses inconvénients. Les travaux présentés dans ce manuscrit s'intéressent à une méthodologie générale pour estimer la RUL d'un composant. L'objectif est de proposer une méthode applicable à un grand nombre de cas et de situations différentes sans nécessiter de modification majeure. De plus, nous cherchons aussi à traiter plusieurs types d'incertitudes afin d'améliorer la justesse des résultats de pronostic. Au final, la méthodologie développée constitue une aide à la décision pour la planification des opérations de maintenance. La RUL estimée permet de décider de l'instant optimal des interventions nécessaires, et le traitement des incertitudes apporte un niveau de confiance supplémentaire dans les valeurs obtenues.

Predictive maintenance strategies can help reduce the ever-growing maintenance costs, but their implementation represents a major challenge. Indeed, it requires to evaluate the health state of the component of the system and to prognosticate the occurrence of a future failure. This second step consists in estimating the remaining useful life (RUL) of the components, in Other words, the time they will continue functioning properly. This RUL estimation holds a high stake because the precision and accuracy of the results will influence the relevance and effectiveness of the maintenance operations. Many methods have been developed to prognosticate the remaining useful life of a component. Each one has its own particularities, advantages and drawbacks. The present work proposes a general methodology for component RUL estimation. The objective i to develop a method that can be applied to many different cases and situations and does not require big modifications. Moreover, several types of uncertainties are being dealt With in order to improve the accuracy of the prognostic. The proposed methodology can help in the maintenance decision making process. Indeed, it is possible to select the optimal moment for a required intervention thanks to the estimated RUL. Furthermore, dealing With the uncertainties provides additional confidence into the prognostic results. ; La mise en place d'une politique de maintenance prévisionnelle est un défi majeur dans l'industrie qui tente de réduire le plus possible les frais relatifs à la maintenance. En effet, les systèmes sont de plus en plus complexes et demandent un suivi de plus en plus poussé afin de rester opérationnels et sécurisés. Une maintenance prévisionnelle nécessite d'une part d'évaluer l'état de dégradation des composants du système, et d'autre part de pronostiquer l'apparition future d'une panne. Plus précisément, il s'agit d'estimer le temps restant avant l'arrivée d'une défaillance, aussi appelé Remaining Useful Life ou RUL en anglais. L'estimation d'une RUL constitue ...

There is very little in the modern literature on the history of written culture that describes the specific practices related to writing that were anchored in colonial contexts. It was not just ships, soldiers, missionaries and settlers that drove the process of European expansion from the 16th to the 19th centuries. The circulation of images, manuscripts and books between different continents played a key role too. The introduction and appropriation of writing into societies without alphabets was a major factor in changing the very function and meaning of written culture. This book explores the extent to which the types of written information that resulted during colonial expansion shaped the numerous and complex processes of cultural exchange from the 16th century onwards in Africa and the Americas

The Cuban people hold a special place in the hearts of the people of Africa. The Cuban internationalists have made a contribution to African independence, freedom, and justice, unparalleled for its principled and selfless character. As Nelson Mandela states, Cuba was a key participant in the struggle for the independence of African countries during the Cold War and the definitive ousting of colonialism from the continent. Beyond the military interventions that played a decisive role in shaping African political history, there were many-sided engagements between the island and the continent. Cuba and Africa, 1959-1994 is the story of tens of thousands of individuals who crossed the Atlantic as doctors, scientists, soldiers, students and artists. Each chapter presents a case study from Algeria to Angola, from Equatorial Guinea to South Africa and shows how much of the encounter between Cuba and Africa took place in non-militaristic fields: humanitarian and medical, scientific and educational, cultural and artistic. The historical experience and the legacies documented in this book speak to the major ideologies that shaped the colonial and postcolonial world, including internationalism, developmentalism and South-South cooperation. Approaching African-Cuban relations from a multiplicity of angles, this collection will appeal to an equally wide range of readers, from scholars in black Atlantic studies to cultural theorists and general readers with an interest in contemporary African history

Exploring the extent to which the control over the materiality of writing has shaped the numerous and complex processes of cultural exchange from the 16th century onwards, this book introduces the specifities of written culture anchored in colonial contexts