916 research outputs found
Equilibrium transition study for a hybrid MAV
No full textWind tunnel testing was performed on a VTOL aircraft in order to characterize longitudinal flight behavior during an equilibrium transition between vertical and horizontal flight modes. Trim values for airspeed, pitch, motor speed and elevator position were determined. Data was collected by independently varying the trim parameters, and stability and control derivatives were identified as functions of the trim pitch angle. A linear fractional representation model was then proposed, along with several methods to improve longitudinal control of the aircraft
Sémantique de l'Espace et du déplacement
No full text@incollection{OL-MATHET-2005, author = {Yann Mathet}, title = {{S{é}mantique de l'Espace et du d{é}placement}}, chapter = {6}, pages = {215-265}, booktitle = {S{é}mantique et traitement automatique des langues}, editor = {Patrice Enjalbert}, series = {Trait{é} IC2, s{é}rie Cognition et traitement de l'information}, publisher = {Herm{è}s Sciences, Lavoisier}, year = {2005}
"I' ll tell you a story that will make you believe" in narratives: the role of metafiction in the novel and in the film Life of Pi
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão, Programa de Pós-Graduação em Inglês: Estudos Linguísticos e Literários, Florianópolis, 2015.Recentes estudos propõem que adaptações cinematográficas sejam entendidas como fonte de criação, os quais refletem contextos e interpretações diferentes do texto em que são baseadas. Nessa dissertação, propõe-se uma análise comparativa do romance Life of Pi (2001), de Yann Martel e do filme homônimo dirigido por Ang Lee (2012). A análise tem como objetivo identificar a presença e o modo em que a metaficção é construída no romance e no filme, e quais são alguns significados produzidos por ela em ambos os textos, tanto o literário quanto o fílmico. A concepção de metafição se baseia nas definições de Linda Hutcheon e Patricia Waugh. Por metaficção, entende-se a ficção consciente de si, que expõe o processo de escrita ao leitor e o convida a ter um papel ativo na construção do significado. Após uma análise comparativa dos dois textos, conclui-se que a metaficção está presente em ambos, tanto tematicamente como estruturalmente. As reflexões sobre narrativas apresentadas pelos personagens, o uso de vários níveis narrativos e de intertextualidade revelam diferentes usos da metafição em ambos. A diferença mais importante entre o romance e o filme Life of Pi está no uso dos níveis narrativos. Enquanto o romance possui um ?autor? sem nome que apresenta a história aos leitores, o filme possui um diretor implícito que deixa pistas de qual versão da história de Pi é ?real? no contexto da narrativa. Essa diferença dá ao romance um final aberto, em que o leitor deve escolher qual versão da história ele acredita, enquanto o filme possui uma resolução para essa questão. O filme, então, pode ser entendido como um testemunho, uma narrativa de trauma de um sobrevivente de um naufrágio e da experiência de migração, enquanto o livro não apresenta uma decisão em relação às versões da história, deixando o leitor aberto a qualquer possibilidade.Abstract : Recent studies propose that Film Adaptations should be understood as sources of creation, which also reflect a different context and interpretation from the text upon which they were based. In this thesis, I propose a comparative analysis of the novel Life of Pi (2001), by Yann Martel, and the homonymous film directed by Ang Lee (2012). The analysis has the objective of identifying the presence and the way in which metafiction is constructed in the novel and in the film, and what are some of the meanings produced by it in both texts, the filmic and the literary. The concept of metafiction was based on the definitions by Linda Hutcheon and Patricia Waugh. It is understood as the self-conscious fictional text, which exposes the writing process to the readers and invites them to have an active role in the construction of meaning. In the comparative analyses of the two texts, I have proved that metafiction is present in the two texts, both thematically and structurally. The reflections of the characters on narrative itself as well as the use of different narrative levels and intertextual references reveal different uses of metanarrative in both film and novel. The most important difference between the novel and the film Life of Pi is in their uses of different narrative levels. While the novel has an unnamed =author? who presents the story to the readers, the film has an implicit director who leaves =clues? of which version of Pi?s story is ?real? in the context of the narrative. This difference gives to the novel an open end, facein which the readers must choose which version of the story they believe in, while the film presents a resolution to this question. The film, thus, can be understood as a testimony narrative, a narrative of the trauma of a survivor from a shipwreck and from the experience of migration, while the novel does not decide for one of the versions of the story, enabling a more inconclusive reading
Design of reconfigurable radiofrequency power amplifiers for wireless applications
No full textThe continuously growing throughput in wireless applications severely impacts the architecture and design of modern transceivers. One of the most challenging aspects is the design of the power amplifier (PA). Indeed, this block dominantly determines the overall transceiver power efficiency and therefore battery life-time. On the other hand, PA linearity is a key feature that limits the maximum allowed data rate. The goal of this thesis is to investigate and design novel smart architectures circumventing the stringent linearity/efficiency trade-off for third generation cellular and data transmission standards. A demonstrator has been developed on silicon (0.25µm BiCMOS ST Microelectronics technology), and has allowed validating the efficiency/linearity improvement principle.Abstrac
The Political Economy of Textbook Writing: Paul Samuelson and the making of the first ten Editions of Economics (1945-1976)
No full textOver the past two decades, numerous contributions to the history of economics have tried to assess Paul Samuelson’s political positioning by tracing it in the subsequent editions of his famous textbook Economics. This literature, however, has provided no consensus about the location of Samuelson’s political ideas. While some authors believe that Samuelson has always had inclinations toward interventionism, others conclude that he more often acted as a pro-business advocate. The purpose of this paper is not to argue for one of these two interpretations but to depict the making of Economics itself as a political process. By ‘political’ it is not meant the conduct of party politics but the many political elements that a textbook author has to take into account if he wants to be published and favorably received. I argue that the “middle of the road” stance that Samuelson adopted in the book was consciously constructed by the MIT economist, with the help of his home institution and his publishing company, McGraw-Hill, to ensure both academic freedom and the success of the book. The reason for which the stance developed is related to pre-McCarthyist right-wing criticisms of the textbook and how Samuelson and the MIT department had to endure the pressures from members of the Corporation (MIT’s Board of Trustees), who tried to prevent the publication of the textbook and threatened Samuelson’s tenure at MIT as soon as 1947 – when early manuscripts were circulated. As a result, it was decided in accordance with both the Corporation and McGraw-Hill that the Readings volume would be published to balance conflicting ideas about state intervention. Following these early criticisms, the making of the subsequent editions relied on a network of instructors and referees all over the US in order to make it as successful and consensual as possible. This seemed to work quite well in the 1950s and for a good portion of the 1960s, until Economics became victim of its own success and was seen, in an ironical twist of fate, as a right wing text by younger, radical economists. From now on, Samuelson will try to have his book sent as often as possible to the radicals for referring process, with mixed results. Eventually, the book became criticized from both its left and its right.Paul Samuelson, Economics, Textbook, Politics, Economic Education
Conception de synthèses de fréquences à 24 GHz à base de diviseurs à mémoires D en technologies silicium avancées
No full textFrequency synthesis is almost used in all RF transceivers, where this function is usually achieved by using phase-locked-loop circuits. Most often, the phase-locked-loop includes digital frequency dividers in the feedback that present high power dissipation and low maximum frequency at gigahertz frequencies. This thesis presents a versatile new D latch-based divider that improves these issues and its application to frequency synthesis. The first part presents several frequency synthesis techniques and theirs main characteristics. Then is described various classical frequency dividers and the proposed new D latch-based SRO divider. A detailed study of the SRO divider is presented with two approaches, the digital one and the analogue one. This study demonstrates the benefit of the SRO divider in terms of power dissipation and speed compared with the widely used D flip-flop based dividers. The last part presents several implementations of the SRO divider in CMOS and BiCMOS processes of ST Microelectronics. Particularly, the SRO divider was implemented in two 24 GHz fractional synthesizers, where it demonstrates its interest for reduction of power dissipation while using small silicon area.La synthèse de fréquences est une fonction largement utilisée dans les émetteur-récepteurs radios. En général, la fonction synthèse de fréquence est réalisée à l’aide d’une boucle à verrouillage de phase utilisant des diviseurs de fréquence numériques. Cette thèse présente un nouveau type de diviseur de fréquence faisant appel à des mémoires D et son application à la synthèse de fréquences. Ce nouveau diviseur permet de repousser les limites des diviseurs numériques classiques à bascules D, en matière de fréquence maximale de fonctionnement et de consommation, tout en conservant leur souplesse d’utilisation. La première partie de cette thèse présente les techniques usuelles de réalisation des synthèses de fréquence et des diviseurs de fréquences, ainsi que le nouveau diviseur SRO à base de mémoires D, sujet de ces travaux. Une étude détaillée de ce diviseur est réalisée avec un premier modèle utilisant une approche numérique, puis un second plus réaliste faisant appel à une modélisation de type analogique. Cette étude démontre que ce nouveau diviseur SRO est capable de fonctionner à une fréquence plus élevée ou avec une consommation moindre, tout en réalisant les mêmes facteurs de division, que les diviseurs classiques à bascules D. La dernière partie de cette thèse présente plusieurs implémentations en technologies CMOS et BiCMOS de ST Microelectronics du diviseur SRO. En particulier son implémentation dans deux synthétiseurs de fréquences fractionnaires à 24 GHz montre son intérêt de part la réduction significative de consommation obtenue, tout en conservant une structure simple utilisant une surface de silicium réduit
Believing in Tigers: Anthropomorphism and Incredulity in Yann Martel’s Life of Pi
No full textRather than the Bengal tiger with whom he shares a lifeboat for 227 days, Pi Patel's true adversary in Yann Martel's Life of Pi is doubt. Pi and his author-narrator align their conception of God with an idea of the work required to believe in narratives that surpass the limits of possibility. Neither Pi nor his author-narrator makes any distinction between the temporary suspension of disbelief and firm religious faith, between the acceptance of a believable story and the embrasure of an omnicient God. By dramatizating the anthropomorphic impulse, which finds expression primarily in response to doubt or disbelief, Life of Pi succeeds in conflating poetic and religious faith
Study of a Radio Frequency Front End (RFFE) based on Walsh sequences for the 5G standard and beyond.
No full textLes services de télécommunications mobiles ont besoin d’une augmentation continue et exponentielle de leurs capacités. Pour répondre à cette demande, les émetteurs-récepteurs doivent être hautement numériques et flexibles. Une solution prometteuse pour atteindre cet objectif est d'utiliser les séquences de Walsh pour générer des signaux arbitraires. On se base sur le principe d'un émetteur "radio logicielle" comprenant un DAC haut débit à haute résolution. Ainsi, l'architecture étudiée consiste en un DAC très large bande (0 à 6 GHz) très efficace pour une amplification RF directe avec pour cible les applications 5G dites de phase 1 et une mise en forme du signal à base de Transformée de Hilbert pour une montée en fréquences millimétriques (au delà de 20GHz) sans recourir à des techniques de filtrage complexes avec pour cible les applications 5G dites de phase 2 ou 6G. L'objectif de ces travaux est de proposer une nouvelle topologie d'émetteur qui répond à des problématiques telles que: la conversion massive de données (très haut débit), l'agrégation de porteuses et la linéarisation dynamique d’un frontal RF. Le candidat devra faire la démonstration de l'architecture proposée en utilisant la technologie 28nm FDSOI de ST Microelectronics. Le travail comportera des simulations haut niveau (MatLab), un dimensionnement de l'architecture, des simulations schematiques, des dessins de masques, une fabrication du circuit, une conception d'un environnement de mesures adéquat et des mesures exhaustives.Mobile telecommunications services require a continuous and exponential increase of their capacities. To meet this demand, transceivers must be highly digital and flexible. A promising solution to achieve this goal is to use Walsh sequences to generate arbitrary waveforms. This is based on the principle of a "software defined radio" transmitter comprising a high-speed, high-resolution DAC. Thus, the studied architecture consists of a very wide band DAC (0 to 6 GHz) very efficient for a direct RF amplification with 5G phase 1 applications as target and a Hilbert Transform based signal shaping for a millimetric frequency upconversion (beyond 20GHz) without resorting to complex filtering techniques with 5G phase 2 or 6G applications as target. The objective of this work is to propose a new transmitter topology that responds to issues such as: massive data conversion (very high throughput), carrier aggregation and dynamic linearization of an RF front end. The candidate will demonstrate the proposed architecture using ST Microelectronics 28nm FDSOI technology. The work will include high level simulations (MatLab), architecture sizing, schematic simulations, mask designs, circuit fabrication, design of a suitable measurement environment and comprehensive measurements
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