Ces travaux de recherche sont réalisés dans le cadre d'une thèse CIFRE en collaboration entre Safran Aircraft Engines et le LURPA de l'ENS Paris-Saclay. Safran Aircraft Engines conçoit et réalise des moteurs pour avions civils et militaires. Afin de répondre au fort développement industriel mondial, Safran Aircraft Engines est constamment en recherche d'optimisation des définitions de ses pièces tout en respectant les cadences de fabrication. Les normes de tolérancement évoluent et les moyens de contrôle s'améliorent. La problématique des travaux est de maîtriser la qualité géométrique des pièces de formes complexes dans le contexte de la continuité numérique.Une méthode permet d'établir les liens entre les fonctions et les spécifications géométriques. De plus, la traçabilité des caractéristiques dimensionnelles et géométriques est établie lors de la phase de tolérancement du produit.Une extension de la méthode CLIC à des composants qui se déforme localement est proposée. Cette extension s'intègre dans la méthode de tolérancement qui établit les liens entre les fonctions et les spécifications.Une méthode originale de génération de descripteurs de forme sur des surfaces permettant la séparation des écarts de taille, de forme, de position et d'orientation est présentée afin de réaliser une Décomposition Modale Discrète. De plus, l'analyse des résultats de la Décomposition Modale Discrète appliquée sur trente surfaces complexes permet de connaître la répétabilité du processus de fabrication. / This PhD work is being carried out as part of a CIFRE PhD thesis in collaboration between Safran Aircraft Engines and the LURPA of the ENS Paris-Saclay. Safran Aircraft Engines designs and manufactures engines for civil and military aircraft. In order to meet the high level of global industrial development, Safran Aircraft Engines is constantly seeking to optimize the definitions of its parts while respecting production rate. Tolerancing standards are changing and control methods are improving. The challenge of this work is to control the geometric quality of complex shaped parts in the context of digital continuity.A method is used to establish the links between functions and geometric specifications. In addition, the traceability of dimensional and geometric characteristics is established during the product tolerancing phase.An extension of the CLIC method to components that deform locally is proposed. This extension is integrated into the tolerance method used to establish the links between functions and specifications.An innovative method of generating shape descriptors on surfaces allowing the separation of size, of shape, of position, and of orientation deviations is described in order to achieve a Discrete Modal Decomposition. In addition, the analysis of the results of the Discrete Modal Decomposition applied to thirty complex surfaces allows us to know the repeatability of the manufacturing process.

This study assessed the digital preservation capability maturity readiness within the context of e-government in Botswana Public Service with a view to developing a strategic framework that ensures digital continuity. There some studies that have been conducted in Botswana regarding digital preservation but they did not provide a framework which could be used as an assessment to check their capability in digital preservation as e-government progresses so that digital information is continuously being used for decision making over time. The study adopted a pragmatic paradigm and embedded mixed method approach; whereby a cross sectional survey and case study were deployed in each of the 6 selected ministries as a unit of analysis. The target study respondents comprises of 5 Senior Managers, 4 Managers - Human Resources and Administration, 6 ICT Managers, 40 Records Management Officers,12 Information Technology Officers, 1 Performance Improvement Coordinator, 1 Project Manager, 8 Archivists, 1 Assistant Deputy Manager and 1 Deputy Managers- Management Services. The data was collected through interviews, questionnaires, personal observations, and documents analysis. Both qualitative and quantitative data were collected sequentially and simultaneously where one form of data supported or complemented each other so as to have one form of data play a supportive role to the other. Data analysis was achieved through the triangulation of both qualitative and quantitative data in order to yield a single interpretation and conclusion drawn. The findings of the study showed that the Botswana Public Service has no unified national information systems used to manage public sector records leading to some ministries adopting their own electronic records management systems. Currently few ministries have implemented the electronic records management system and majority of the digital records are not preserved due to lack of preservation guidelines and strategies. The study further established the lack of preservation policies and skills in managing and preserving digital records in Botswana Public Service. In that regard, the study developed a strategic framework for digital preservation capability maturity readiness in the context of e-government in the Botswana Public Sector. The ultimate aim of the framework is to ensure digital continuity and make sure that e-government is sustained for the benefit of an open government and increased participatory citizenry. / Information Science / D. Litt. et Phil. (Information Science)