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.

Recent excavations uncovered numerous small rooms constructed on top of the Danta Acropolis at El Mirador, Guatemala. The characteristics of the settlement and the material items indicated that it was a late occupation and lacked the features associated with large Maya polities and Classic Maya culture. This thesis focused on describing the continuities and changes that occurred from the Late Classic to the Terminal Classic at El Mirador based on the ceramic assemblage and architecture. Significant continuity and stability of the pottery making community is reflected in the ceramic assemblage. Additionally, it was desirable to gain an understanding of how the Terminal Classic occupation at El Mirador differed from other Maya cities. The comparisons show that on a general level, despite being a small settlement, El Mirador participated in many of the cultural patterns that characterize the Terminal Classic period. Two levels of ceramic production are postulated for the Late Classic period, one sustaining production of fine wares (polychromes) and the other sustaining production of basic production (utilitarian wares). The people inhabiting El Mirador in the Terminal Classic period were materially less well-off, and did not pursue activities associated with high culture as their counterparts did in larger cities. Nevertheless, they were not culturally isolated and they had access to trade items and small quantities of prestige goods.

Mathematics students and teachers are familiar with the difficulty of learning and teaching concepts of continuity and limits. Research has expanded our knowledge of how students think about these concepts, including different conceptions and metaphors students use to reason about continuity and limits at a point. From the literature I have identified four potentially problematic conceptions (PPCs) students may use when reasoning about limit and continuity at a point. Questionnaires were administered to 861 BYU students in various mathematics courses to determine how prevalent and persistent the PPCs are among the students in each course. Interviews were conducted with nine first semester calculus to get an idea of how students reason about continuity and limit at a point and how that influences whether they use the PPCs. Students showed evidence of holding the four PPCs with a decrease in these conceptions typically after they took a course in analysis. Participants also did not understand the Formal definition of a Limit until they took a course in Analysis. Students were able to reason appropriately using many different conceptions of continuity. Considering limit conceptions, students using a Dynamic conception of Limit tended to be better able to reason about continuity and limit at a point. Students who did not use a Dynamic conception of limit tended to use the PPCs in general and incorrectly more often.

Ensuring adequate and timely follow-up is one of the essential parts of providing good patient care in a primary care setting. If the next visit is not scheduled prior to a patient leaving the clinic, it often results in them being “lost to follow-up.” This results in inadequate care, delays in treatment, and increased burden of disease. Using the currently available scheduling mechanism in our EHR is a tedious and time-consuming process that makes it difficult to arrange for follow up visits prior to the patient arriving at the checkout window after they leave the exam room. This often resulted in no appointment being scheduled at all or one much later than the provider intended. Our proposed solution to this problem was to replace the electronic scheduling mechanism with small paper “follow-up cards” that patients are given to take to the checkout desk with them. We implemented this new process in our clinic for a 3-month period and evaluated resident satisfaction with follow-up and checkout procedures before and after the change. We found that residents preferred using the card system because they felt it improved their workflow in clinic and improved efficiency of scheduling follow up visits. Given the positive reviews, it was decided to implement the follow up cards as a permanent mechanism for scheduling appointments in our clinic until a more efficient electronic system can be arranged.

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