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  • Open Access English
    Authors: 
    Frédéric Jurie;
    Publisher: HAL CCSD
    Country: France

    International audience; We propose an efficient method for tracking 3D modelled objects in cluttered scenes. Rather than tracking objects in the image, our approach relies on the object recognition aspect of tracking. Candidate matches between image and model features define volumes in the space of transformations. The volumes of the pose space satisfying the maximum number of correspondences are those that best align the model with the image. Object motion defines a trajectory in the pose space. We give some results showing that the presented method allows tracking of objects even when they are totally occluded for a short while, without supposing any motion model and with a low computational cost (below 200 ms per frame on a basic workstation). Furthermore, this algorithm can also be used to initialize the tracking.

  • English
    Authors: 
    Guillaume, Benjamin; Gautheron, C.; Simon-Labric, Thibaud; Martinod, Joseph; Roddaz, Martin; Douville, E.;
    Publisher: HAL CCSD
    Country: France

    International audience; The formation and evolution of relief in subduction-related orogens result from a variety of processes acting at different scales of time and space. The interplay between tectonics and erosion (river incision, glacial erosion. . . ) is generally the principal contributor to the relief development. However, Earth's surface topography is also shaped by mantle convection, the latter generally producing a low amplitude, long-wavelength deflection of the surface as a response to the distribution of density anomalies in the mantle. For regions where mantle dynamics may change rapidly, e.g. in subduction zones where slab windows form, the signal of dynamic topography may also be variable in time and space, and exert an important control on landscape evolution, but this issue has been poorly addressed so far. Patagonian is one of the few regions on Earth where a slab window is currently developing. The arrival at trench of the Chile Ridge separating the Nazca and Antarctic plates at the latitude of 54 S ca. 16 Ma ago and the westward motion of South America led to the intermittent migration toward the north of the associated triple junction and the progressive enlargement of the Patagonian slab window, which is clearly identified on tomographic images as a low seismic velocity anomaly in the upper mantle. The contribution of slab-window-related dynamic topography in the topographic evolution of the Patagonian Cordillera has generally not been considered mainly because local flexural and isostatic adjustments due to tectonics and erosion obscure the dynamic topography signal. In particular, glaciations recorded by the oldest glacial till preserved in South America, played an important role in shaping the Andean landscape as early as ca. 5-7.4 Ma. In this study, we combine low-temperature thermochronology apatite (U-Th)/He data and semi-analytical modeling of dynamic topography to investigate the role of slab window and climate on cooling/heating history and relief evolution in the Patagonian Cordillera. In particular, we discuss a new thermochronological dataset consisting in 22 samples divided into four elevation transects. Sampling sites were chosen at the same distance from the trench (250-300 km), on the leeward eastern side of the orogen, for latitudes ranging between 45 S and 48 S to detect a potential northward migration of the thermal signal associated with the northward migration of the slab window. We show that history of heating and cooling for this region of the southern Andes compares well with the time-evolution of slab window and that present-day latitudinal topographic variations cannot be explained by climate alone but require an additional support by dynamic topography.

  • Publication . Part of book or chapter of book . Conference object . 2012
    English
    Authors: 
    Patrick Bosc; Olivier Pivert;
    Publisher: HAL CCSD
    Country: France

    This paper introduces a fuzzy inclusion indicator derived from a connective aimed at modulating a fuzzy criterion according to the satisfaction of another one. The idea is to express that one is all the more demanding as to the degree attached to an element x in a set B as this element has a high degree of membership degree to a set A. The use of this reinforced inclusion indicator is illustrated in the context of database querying.

  • Publication . Conference object . Article . 2021
    Open Access English
    Authors: 
    A. Adil; Ibrahima N'Doye; Ali Zemouche; Abdelghani Hamaz; Taous-Meriem Laleg-Kirati;
    Publisher: HAL CCSD
    Country: France

    Published in IFAC-PapersOnLine, 54(14):96:101, 2021; International audience; The coupled tanks system is a widely used nonlinear system for testing control and estimation methods. This system has various applications such as wastewater treatment, water desalination, pharmaceutical industries, and petrochemical plants. Among the challenging problems is the water level estimation which is needed for controlling the system. In this paper, a high-gain like observer is proposed for the estimation of the water level from delayed output measurement. This observer tolerates a larger bound of the time-delay compared to that obtained by using standard high-gain approach. We show the effectiveness of such observer design and how the standard approach fails to reconstruct the water level in the tanks in the presence of a larger bound on the time-delay.

  • Open Access English
    Authors: 
    Vladik Kreinovich; Christelle Jacob; Didier Dubois; Janette Cardoso; Martine Ceberio; Ildar Z. Batyrshin;
    Publisher: HAL CCSD
    Country: France
    Project: NIH | Enhancement of Quantitati... (1T36GM078000-01), NIH | Enhancement of Quantitati... (1T36GM078000-01)

    In many real-life applications (e.g., in aircraft maintenance), we need to estimate the probability of failure of a complex system (such as an aircraft as a whole or one of its subsystems). Complex systems are usually built with redundancy allowing them to withstand the failure of a small number of components. In this paper, we assume that we know the structure of the system, and, as a result, for each possible set of failed components, we can tell whether this set will lead to a system failure. For each component A, we know the probability P(A) of its failure with some uncertainty: e.g., we know the lower and upper bounds P(A) and P(A) for this probability. Usually, it is assumed that failures of different components are independent events. Our objective is to use all this information to estimate the probability of failure of the entire the complex system. In this paper, we describe several methods for solving this problem, including a new efficient method for such estimation based on Cauchy deviates.

  • French
    Authors: 
    Angheben, Marcello;
    Publisher: HAL CCSD
    Country: France

    International audience

  • English
    Authors: 
    Sabri-Zaaraoui, Ouidade;
    Publisher: HAL CCSD
    Country: France

    International audience; Although intensively transgressed by advertisers, next to nothing has been written on the subject of taboos in marketing. Based on a multi-field approach (anthropological, sociological and psychoanalysis), a conceptualization of the taboo is proposed and a reliable and valid measurement of this construct in an advertising context is developed. Using this scale, the communication effects of taboo ads are investigated. The use of taboos in ads leads to a more negative attitude toward the ad which carries over into negative attitude toward the brand and negative purchase intention. The utility of the proposed scale is discussed both for future research and advertising strategy.

  • English
    Authors: 
    Tribut, Laurent; Meynié, Laure; Fenouillot, Françoise; Pascault, Jean-Pierre; Carrot, Christian;
    Publisher: HAL CCSD
    Country: France
  • Publication . Preprint . Article . Conference object . 2018
    Open Access English
    Authors: 
    Moser, Daniel; Abele, Hartmut; Bosina, Joachim; Fillunger, Harald; Soldner, Torsten; Wang, Xiangzun; Zmeskal, Johann; Konrad, Gertrud;
    Publisher: HAL CCSD
    Country: France
    Project: FWF | Particles and Interaction... (W 1252)

    The beta decay of the free neutron provides several probes to test the Standard Model of particle physics as well as to search for extensions thereof. Hence, multiple experiments investigating the decay have already been performed, are under way or are being prepared. These measure the mean lifetime, angular correlation coefficients or various spectra of the charged decay products (proton and electron). NoMoS, the Neutron decay prOducts MOmentum Spectrometer, presents a novel method of momentum spectroscopy: it utilizes the $R \times B$ drift effect to disperse charged particles dependent on their momentum in an uniformly curved magnetic field. This spectrometer is designed to precisely measure momentum spectra and angular correlation coefficients in free neutron beta decay to test the Standard Model and to search for new physics beyond. With NoMoS, we aim to measure inter alia the electron-antineutrino correlation coefficient $a$ and the Fierz interference term $b$ with an ultimate precision of $\Delta a/a < 0.3\%$ and $\Delta b < 10^{-3}$ respectively. In this paper, we present the measurement principles, discuss measurement uncertainties and systematics, and give a status update. Comment: 7 pages, 4 figures, accepted to the Proceedings of the International Workshop on Particle Physics at Neutron Sources PPNS 2018, Grenoble, France, May 24-26, 2018

  • Open Access English
    Authors: 
    Vincent Lesieur; Béatrice Courtial; Alain Roques; Marie-Anne Auger-Rozenberg;
    Publisher: HAL CCSD
    Country: France

    International audience

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