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Search Results: 1 - 10 of 3871 matches for " Denis Gillet "
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From online experiments to smart devices
Christophe Salzmann,Denis Gillet
International Journal of Online Engineering (iJOE) , 2008,
Abstract: Online experiments have been available for more than a decade. The integration of online experiments into collaborative environments is more recent. The wealth of client applications/environments, the versatility of possible interaction protocols/technologies and the needs for more autonomous actions impel the evolution of online experiments to the smart device concept. This paper reviews the evolution of an electrical drive experiment and presents the requirements for turning online experiments into smart devices.
May I Suggest? Comparing Three PLE Recommender Strategies
Felix M?dritscher,Barbara Krumay,Sandy El Helou,Denis Gillet
Digital Education Review , 2011,
Abstract: Personal learning environment (PLE) solutions aim at empowering learners to design (ICT and web-based) environments for their learning activities, mashingup content and people and apps for different learning contexts. Widely used in other application areas, recommender systems can be very useful for supporting learners in their PLE-based activities, to help discover relevant content, peers sharing similar learning interests or experts on a specific topic. In this paper we examine the utilization of recommender technology for PLEs. However, being confronted by a variety of educational contexts we present three strategies for providing PLE recommendations to learners. Consequently, we compare these recommender strategies by discussing their strengths and weaknesses in general.
A Global Remote Laboratory Experimentation Network and the Experiment Service Provider Business Model and Plans
Tor Ivar Eikaas,Christian Schmid,Bjarne A. Foss,Denis Gillet
Modeling, Identification and Control , 2003, DOI: 10.4173/mic.2003.3.2
Abstract: This paper presents results from the IST KAII Trial project ReLAX - Remote LAboratory eXperimentation trial (IST 1999-20827), and contributes with a framework for a global remote laboratory experimentation network supported by a new business model. The paper presents this new Experiment Service Provider business model that aims at bringing physical experimentation back into the learning arena, where remotely operable laboratory experiments used in advanced education and training schemes are made available to a global education and training market in industry and academia. The business model is based on an approach where individual experiment owners offer remote access to their high-quality laboratory facilities to users around the world. The usage can be for research, education, on-the-job training etc. The access to these facilities is offered via an independent operating company - the Experiment Service Provider. The Experiment Service Provider offers eCommerce services like booking, access control, invoicing, dispute resolution, quality control, customer evaluation services and a unified Lab Portal.
Shock-Induced Polarized Hydrogen Emission Lines in the Mira Star omicron Ceti
Nicolas Fabas,Agnès Lèbre,Denis Gillet
Physics , 2011, DOI: 10.1051/0004-6361/201117748
Abstract: In the spectra of pulsating stars, especially Mira stars, the detection of intense hydrogen emission lines has been explained by a radiative shock wave, periodically propagating throughout the atmosphere. Previous observation of the Mira star omicron Ceti around a bright maximum of light led to the detection of a strong linear polarization associated to Balmer emissions, although the origin of this phenomenon is not fully explained yet. With the help of spectropolarimetry, we propose to investigate the nature of shock waves propagating throughout the stellar atmosphere and present, for omicron Ceti (the prototype of Mira stars), a full observational study of hydrogen emission lines formed in the radiative region of such a shock. Using the instrument NARVAL, we performed a spectropolarimetric monitoring of omicron Ceti during three consecutive pulsation cycles. All Stokes parameters were systematically collected, with a particular emphasis on the maxima of luminosity, i.e. when a radiative shock wave is supposed to emerge from the photosphere and propagate outward. On Balmer lines, over a large part of the luminosity cycle, we report detections in Stokes spectra which are evolving with time. These signatures appear to be strongly correlated to the presence of an intense shock wave responsible for the hydrogen emission lines. We establish that those lines are polarized by a process inherent to the mechanism responsible for the emission line formation: the shock wave itself. Two mechanisms are considered: a global one that implies a polarization induced by convective cells located around the photosphere and a local one that implies a charge separation due to the passage of the shock wave, inducing an electrical current. Combined with the existing turbulence, this may generate a magnetic field, hence polarization.
Collision Avoidance in Next-generation Fiber Positioner Robotic System for Large Survey Spectrograph
Laleh Makarem,Jean-Paul Kneib,Denis Gillet,Hannes Bleuler,Mohamed Bouri,Laurent Jenni,Francisco Prada,Justo Sanchez
Physics , 2013, DOI: 10.1051/0004-6361/201323202
Abstract: Some of the next generation massive spectroscopic survey projects, such as DESI and PFS, plan to use thousands of fiber positioner robots packed at a focal plane to quickly move in parallel the fiber-ends from the previous to the next target points. The most direct trajectories are prone to collision that could damage the robots and impact the survey operation. We thus present here a motion planning method based on a novel decentralized navigation function for collision-free coordination of fiber positioners. The navigation function takes into account the configuration of positioners as well as the actuator constraints. We provide details for the proof of convergence and collision avoidance. Decentralization results in linear complexity for the motion planning as well as dependency of motion duration with respect to the number of positioners. Therefore the coordination method is scalable for large-scale spectrograph robots. The short in-motion duration of positioner robots (~2.5 seconds using typical actuator constraints), will thus allow the time dedicated for observation to be maximized.
Foreignness or Englishness?
Lucie Gillet
Acta Scientiarum : Language and Culture , 2008,
Abstract: PHILLIPS, Caryl. Foreigners. New York: Knopf, 2007. 235 p. ISBN 9781400043972.
De géographie sauve des autres… 1
Alexandre Gillet
EspacesTemps.net , 2007,
Abstract: De géographie sauve des autres, on ne trouvera guère traces ni même linéaments dans ce livre-ci, ni d’ailleurs dans cette nouvelle région du monde à laquelle édouard Glissant nous introduit de fa on si critique et si volitive. Un livre donc, de l’avis même du poète, à l’abord tourmenté comme par ailleurs seul peut l’être le rivage, mais qui au fond rendrait fidèlement compte des mouvements qui habitent, pour ainsi dire animent, le monde d’aujourd’hui et ses ...
Dérives a topiques.
Alexandre Gillet
EspacesTemps.net , 2006,
Abstract: En prenant clairement une position interdisciplinaire, cette méditation sur le nomadisme et sur le non-lieu invite le lecteur à s’écarter de certains lieux communs pour considérer avec beaucoup d’attention notre pratique et notre expérience des lieux, d’un lieu après l’autre. Sur ce chemin, plusieurs travaux serviront de points de repère et d’amers. Chaque auteur choisi — Paul Virilio en tête, suivi de Marc Augé, Georges Balandier, Michel de Certeau, Jean Duvignaud et Michel Foucault — approchant singulièrement la question du non-lieu. Trait d’union à cette tentative — qui pourra ressembler par instant à une dérive —, le corpus théorético-pratique de la géopoétique en sera également le vis-à-vis. Enfin, si but avoué il y a, c’est bien, à la suite du nomade , de défaire le vocable non-lieu de son caractère de hors-lieu et de s’engager sur le terrain de l’atopie (pensée). Taking clearly an interdisciplinary position, this meditation on nomadism and no-place will try to keep away from some topics in order to consider with renewed attention our practice and experience of places, one place after the other. Many works will serve as references. Every author — Paul Virilio, Marc Augé, Georges Balandier, Michel de Certeau and Michel Foucault — approaching in his own way this phenomenon. Accompanying us along this attempt (which may potentially be called a “drift”), the corpus of the geopoetics will also serve as a theoretical and practical “anchor”. At last, if there is in this paper an aim, it is, in the footsteps of the nomad, to free the word “no-place” of its non-place “nature” and to enter the field of a-topia.
Asymptotic behaviour of watermelons
Florent Gillet
Mathematics , 2003,
Abstract: A watermelon is a set of $p$ Bernoulli paths starting and ending at the same ordinate, that do not intersect. In this paper, we show the convergence in distribution of two sorts of watermelons (with or without wall condition) to processes which generalize the Brownian bridge and the Brownian excursion in $\mathbb{R}^p$. These limit processes are defined by stochastic differential equations. The distributions involved are those of eigenvalues of some Hermitian random matrices. We give also some properties of these limit processes.
Arithmetic Intersection Theory on Deligne-Mumford Stacks
Henri Gillet
Mathematics , 2009,
Abstract: The arithmetic Chow groups and their product structure are extended from the category of regular arithmetic varieties to regular Deligne-Mumford stacks over the ring of integers in a number field.
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