Contribution à la modélisation de la propagation d'un incendie au moyen d'outils d'analyse d'images et de techniques informatiques PDF Download
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Author: Nabil Laachfoubi
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
L'un des axes importants de recherche du laboratoire de sciences, est la modélisation des incendies de forêt. Nous avons souhaité, par nos travaux, nous inscrire dans ce projet, à travers l'élaboration de deux outils : en premier lieu, nous avons cherché à estimer les vitesses et directions locales du vent, à partir de l'analyse du déplacement de la fumée sur une séquence d'images aériennes. Nous avons développé une méthode robuste, composée d'une succession d'algorithmes de traitement d'images, tels que la segmentation, la construction d'une variante du graphe de la ligne médiane et une technique de mise en correspondance locale des principaux nuds. Cette méthode a été approuvée avec succès sur des séquences d'images réelles et de synthèse. Dans un deuxième temps, nous avons développé un algorithme de simulation d'incendie, sur la base du modèle présenté par nos collègues physiciens. Par une légère modification apportée à ce modèle, nous avons pu obtenir une propagation plus circulaire. Nous proposons également une modélisation efficace des effets de pente, ce qui permet d'envisager une simulation des directions de pentes variables. Nous avons enfin développé deux logiciels conviviaux qui valident notre approche.
Author: Nabil Laachfoubi
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
L'un des axes importants de recherche du laboratoire de sciences, est la modélisation des incendies de forêt. Nous avons souhaité, par nos travaux, nous inscrire dans ce projet, à travers l'élaboration de deux outils : en premier lieu, nous avons cherché à estimer les vitesses et directions locales du vent, à partir de l'analyse du déplacement de la fumée sur une séquence d'images aériennes. Nous avons développé une méthode robuste, composée d'une succession d'algorithmes de traitement d'images, tels que la segmentation, la construction d'une variante du graphe de la ligne médiane et une technique de mise en correspondance locale des principaux nuds. Cette méthode a été approuvée avec succès sur des séquences d'images réelles et de synthèse. Dans un deuxième temps, nous avons développé un algorithme de simulation d'incendie, sur la base du modèle présenté par nos collègues physiciens. Par une légère modification apportée à ce modèle, nous avons pu obtenir une propagation plus circulaire. Nous proposons également une modélisation efficace des effets de pente, ce qui permet d'envisager une simulation des directions de pentes variables. Nous avons enfin développé deux logiciels conviviaux qui valident notre approche.
Author: Frédérique Giroud
Publisher:
ISBN:
Category :
Languages : fr
Pages : 392
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Book Description
PARTIE 1 CE TRAVAIL PRESENTE UNE NOUVELLE APPROCHE DE LA MODELISATION DE LA PROPAGATION D'UN FEU, BASEE SUR L'INTERACTION ENTRE LE COMBUSTIBLE ET LA DYNAMIQUE DES GAZ ENVIRONNANTS. LE COMBUSTIBLE EST CONSIDERE COMME UN MILIEU MULTIPHASIQUE, CONSTITUE D'UNE PHASE GAZEUSE ET DE PLUSIEURS PHASES SOLIDES. UNE FORMULATION, BASEE SUR DES MOYENNES SPATIALES PONDEREES EST DEVELOPPEE ET CONDUIT A L'ETABLISSEMENT DE SYSTEMES D'EQUATIONS MULTIPHASIQUES, REACTIFS ET RADIATIFS. ON EFFECTUE DES SIMULATIONS NUMERIQUES MONODIMENSIONNELLES D'UN FEU A CO ET CONTRE-COURANT, DANS UN MILIEU HETEROGENE COMPOSE DE PARTICULES COMBUSTIBLES FIXES. ON PRESENTE ENSUITE UN MODELE QUASI-BIDIMENSIONNEL DEDUIT DIRECTEMENT DES EQUATIONS GENERALES ET RESOLU POUR SIMULER LA PROPAGATION D'UN FEU DANS DES LITIERES DE PIN MARITIME ET DE PIN D'ALEP, EN FONCTION DE LA PENTE ET DE LA CHARGE DU LIT DE COMBUSTIBLE. LES RESULTATS OBTENUS SONT COMPARES A DES RESULTATS EXPERIMENTAUX. PARTIE 2 UNE ETUDE NUMERIQUE D'UN ECOULEMENT DE PROPERGOL INDUIT PAR UN FEU DE PROPERGOL SOLIDE EN CAVITE EST PRESENTE. LA CAVITE POSSEDE UNE OUVERTE EN PLAFOND, OBTUREE PAR UN OPERCULE QUI SE ROMPT DES QUE LA PRESSION DEPASSE UN SEUIL LIMITE. LES CONDITIONS LIMITES PARTICULIERES QUI SONT LA ZONE DE COMBUSTION ET LA SECTION DE SORTIE AU NIVEAU DE L'OPERCULE SONT TRAITEES RESPECTIVEMENT PAR UN DEMI PROBLEME ET PAR UN PROBLEME DE RIEMANN. L'EVOLUTION DANS LE TEMPS DE LA TEMPERATURE ET DE LA PRESSION MOYENNE DU GAZ AINSI QUE DE LA DISPARITION D'OXYGENE EST EXAMINEE POUR DEUX CAS D'OUVERTURE DE L'OPERCULE.
Author: CIKM 13 Conference Committee
Publisher:
ISBN: 9781450326964
Category : Computers
Languages : en
Pages : 938
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Book Description
CIKM'13: 22nd ACM International Conference on Information and Knowledge Management Oct 27, 2013-Nov 01, 2013 San Francisco, USA. You can view more information about this proceeding and all of ACM�s other published conference proceedings from the ACM Digital Library: http://www.acm.org/dl.
Author: Chevalier François Le
Publisher: Artech House
ISBN: 9781608071357
Category : Radar
Languages : en
Pages : 422
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Book Description
Author:
Publisher: BRILL
ISBN: 9004308237
Category : Language Arts & Disciplines
Languages : en
Pages : 401
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Book Description
Taking an interdisciplinary approach, this volume brings together contributions by distinguished experts from different disciplinary fields for a multidimensional view on immersion in the visual arts and media. In the current media debate, immersion has frequently been linked to the advent of digital technology and its capacity to provide vivid sensations of being placed in or surrounded by an artificial space. The idea of ‘liquidity’ contained in this promise to plunge into another world informs wide areas of contemporary cultural imagination, referring to a myriad of phenomena that relate to experiences of uncertainty and instability, of complexity and change. Considering the fact, however, that the idea of ‘liquid’ spaces appeared long before the digital creation of augmented or virtual environments, the contributors to this volume trace its reemerging throughout the history of the visual arts and media. By focusing on selected works of painting and architecture, photography and cinema, video installation and media art, they explore the variability of immersive experiences according to the different media environments and interfaces that constitute the actual sites of historically shifting relations between media and users. Contributors are: Matthias Bauer, Jörg von Brincken, Robin Curtis, Burcu Dogramaci, Thomas Elsaesser, Ole W. Fischer, Gundolf S. Freyermuth, Ursula Frohne, Henry Keazor, Matthias Krüger, Katja Kwastek, Fabienne Liptay, Karl Prümm, Martin Warnke.
Author: Divya P. Tolia-Kelly
Publisher: Routledge
ISBN: 1317001125
Category : History
Languages : en
Pages : 210
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Book Description
Two of the key theoretical shifts over the past two decades of critical work have been the 'visual turn' and the 'material turn'. This book argues that these hitherto distinct fields should be understood as in continual dialogue and co-constitution and focuses on reconceptualising the visual as an embodied, material, and often politically-charged realm. This edited volume elaborates this conceptual argument through a series of contemporary case studies, drawn from the disciplines of Architecture, Sociology, Media Studies, Geography and Cultural Studies. The case studies included are paired around four themes: consumption, translation, practice and ethics. As well as exploring the bringing together of visuality and materiality studies, the contributors raise questions of social identity and social critique, and also focus on the ethics of material visualities.
Author: Jeffrey Ruoff
Publisher: Duke University Press
ISBN: 9780822337133
Category : Performing Arts
Languages : en
Pages : 316
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Book Description
DIVThe different forms that travelogues have taken (documentaries, IMAX, home movies, ethnographic films) from the 1800s to the present./div
Author: Alison Griffiths
Publisher: Columbia University Press
ISBN: 0231129890
Category : Performing Arts
Languages : en
Pages : 392
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Book Description
From the architectural spectacle of the medieval cathedral and the romantic sublime of the nineteenth-century panorama to the techno-fetishism of today's London Science Museum, humans have gained a deeper understanding of the natural world through highly illusionistic representations that engender new modes of seeing, listening, and thinking. What unites and defines many of these wondrous spaces is an immersive view-an invitation to step inside the virtual world of the image and become a part of its universe, if only for a short time. Since their inception, museums of science and natural history have mixed education and entertainment, often to incredible, eye-opening effect. Immersive spaces of visual display and modes of exhibition send "shivers" down our spines, engaging the distinct cognitive and embodied mapping skills we bring to spectacular architecture and illusionistic media. They also force us to reconsider traditional models of film spectatorship in the context of a mobile and interactive spectator. Through a series of detailed historical case studies, Alison Griffiths masterfully explores the uncanny and unforgettable visceral power of the medieval cathedral, the panorama, the planetarium, the IMAX theater, and the science museum. Examining these structures as exemplary spaces of immersion and interactivity, Griffiths reveals the sometimes surprising antecedents of modern media forms, suggesting the spectator's deep-seated desire to become immersed in a virtual world. Shivers Down Your Spine demonstrates how immersive and interactive museum display techniques such as large video displays, reconstructed environments, and touch-screen computer interactives have redefined the museum space, fueling the opposition between public and private, science and spectacle, civic and corporate interests, voice and text, and life and death. In her remarkable study of sensual spaces, Griffiths explains why, for centuries, we keep coming back for more.
Author: Vanessa R. Schwartz
Publisher: Yale University Press
ISBN: 030024746X
Category : Design
Languages : en
Pages : 229
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Book Description
A stunning look at the profound impact of the jet plane on the mid-century aesthetic, from Disneyland to Life magazine Vanessa R. Schwartz engagingly presents the jet plane’s power to define a new age at a critical moment in the mid-20th century, arguing that the craft’s speed and smooth ride allowed people to imagine themselves living in the future. Exploring realms as diverse as airport architecture, theme park design, film, and photography, Schwartz argues that the jet created an aesthetic that circulated on the ground below. Visual and media culture, including Eero Saarinen’s airports, David Bailey’s photographs of the jet set, and Ernst Haas’s experiments in color photojournalism glamorized the imagery of motion. Drawing on unprecedented access to the archives of The Walt Disney Studios, Schwartz also examines the period’s most successful example of fluid motion meeting media culture: Disneyland. The park’s dedication to “people-moving” defined Walt Disney’s vision, shaping the very identity of the place. The jet age aesthetic laid the groundwork for our contemporary media culture, in which motion is so fluid that we can surf the internet while going nowhere at all.
Author: Yves Citton
Publisher: John Wiley & Sons
ISBN: 1509533419
Category : Social Science
Languages : en
Pages : 341
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Book Description
We think that we live in democracies: in fact, we live in mediarchies. Our political regimes are based less on nations or citizens than on audiences shaped by the media. We assume that our social and political destinies are shaped by the will of the people without realizing that ‘the people’ are always produced, both as individuals and as aggregates, by the media: we are all embedded in mediated publics, ‘intra-structured’ by the apparatuses of communication that govern our interactions. In this major book, Yves Citton maps out the new regime of experience, media and power that he designates by the term ‘mediarchy’. To understand mediarchy, we need to look both at the effects that the media have on us and also at the new forms of being and experience that they induce in us. We can never entirely escape from the effects of the mediarchies that operate through us but by becoming more aware of their conditioning, we can develop the new forms of political analysis and practice which are essential if we are to rise to the unprecedented challenges of our time. This comprehensive and far-reaching book will be essential reading for students and scholars in media and communications, politics and sociology, and it will be of great interest to anyone concerned about the multiple and complex ways that the media – from newspapers and TV to social media and the internet – shape our social, political and personal lives today.
