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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Garcia Alfaro, Joaquin; Barbeau, Michel; Kranakis, Evangelos;

    International audience; We define three privacy-preserving solutions to the problem of distributing secrets between manufacturers and vendors of items labeled with Electronic Product Code (EPC) Gen2 tags. The solutions rely on the use of an anonymous threshold secret sharing scheme that allows the exchange of blinded information between readers and tags. Moreover, our secret sharing scheme allows self-renewal of shares with secret preservation between asynchronous shareholders. The first two solutions address the eavesdropping and rogue scanning threats. The third solution mitigates as well tracking threats.

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    Authors: Behr, Michel; Llari, Maxime;

    Proceedings de la 3ème édition de la conférence internationale Simbio-M (2014). Organisée conjointement par l'IFSTTAR, Aix-Marseille Université, l'université de Coventry et CADLM, cette conférence se concentre sur les progrès des technologies de simulation dans les domaines des sciences du vivant et multiphysiques: Biomécanique, Biomatériaux et Biomédical. L'objectif de cette conférence est de partager et d'explorer les résultats dans les techniques d'analyse numérique et les outils de modélisation mathématique. Cette approche numérique permet des études prévisionnelles ou exploratoires dans les différents domaines des biosciences.

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    Other literature type . 2014
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    HAL AMU
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Prados, Ferran; Ashburner, John; Blaiotta, Claudia; Brosch, Tom; +24 Authors

    An important image processing step in spinal cord magnetic resonance imaging is the ability to reliably and accurately segment grey and white matter for tissue specific analysis. There are several semi- or fully-automated segmentation methods for cervical cord cross-sectional area measurement with an excellent performance close or equal to the manual segmentation. However, grey matter segmentation is still challenging due to small cross-sectional size and shape, and active research is being conducted by several groups around the world in this field. Therefore a grey matter spinal cord segmentation challenge was organised to test different capabilities of various methods using the same multi-centre and multi-vendor dataset acquired with distinct 3D gradient-echo sequences. This challenge aimed to characterize the state-of-the-art in the field as well as identifying new opportunities for future improvements. Six different spinal cord grey matter segmentation methods developed independently by various research groups across the world and their performance were compared to manual segmentation outcomes, the present gold-standard. All algorithms provided good overall results for detecting the grey matter butterfly, albeit with variable performance in certain quality-of-segmentation metrics. The data have been made publicly available and the challenge web site remains open to new submissions. No modifications were introduced to any of the presented methods as a result of this challenge for the purposes of this publication. Highlights • First grey matter spinal cord segmentation challenge. • Six institutions participated in the challenge and compared their methods. • Public available dataset from multiple vendors and sites. • The challenge web site remains open to new submissions.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Europe PubMed Centra...arrow_drop_down
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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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    UCL Discovery
    Article . 2017
    Data sources: UCL Discovery
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    NeuroImage
    Article . 2017
    License: Elsevier TDM
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Europe PubMed Centra...arrow_drop_down
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      UCL Discovery
      Article . 2017
      Data sources: UCL Discovery
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      NeuroImage
      Article . 2017
      License: Elsevier TDM
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Peters, James,;

    Cet article présente des présentations de groupe libres de formes triangulaires à trajectoire plane et de leurs nombres de Betti correspondants. Les chemins sont des cartes dans la théorie de l'homotopie. Les arêtes des triangles de chemins sont des chemins homotopes. Les principaux résultats de cet article sont que (1) chaque triangle de chemin a une présentation de groupe libre et (2) chaque triangle de chemin de chemin a une réalisation géométrique. This paper introduces free group presentations of planar path triangular shapes and their corresponding Betti numbers. Paths are maps in homotopy theory. The edges of path triangles are homotopic paths. Main results in this paper are that (1)every path triangle has a free group presentation and (2) every path path triangle has a geometric realization.

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    Authors: Tencer, Lukas; Režnáková, Marta; Cheriet, Mohamed;

    International audience; We present a novel approach towards signature recognition from spatio-temporal data. The data is obtained by recording gyroscope and accelerometer measurements from an embedded pen device. The idea of Universum learning was previously presented by Vapnik and recently popularized in machine learning community. It assumes that the decision boundary of a classifier lies close to data with high uncertainty. The quality of the final classifier strongly depends on a way how to choose the Universum data and also on the representation of original data. In our paper we use a novel approach of Universum learning to classify signature data, also we present our novel idea how to sample the Universum data. At last, we also find more effective representation of the signature data itself compared to the baseline method. These three novelties allow us to outperform previously published results by 4.89% / 5.58%.

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    Authors: P. Chaubey, Yogendra; Chesneau, Christophe; Doosti, Hassan;

    In this paper, a mixture model under multiplicative censoring is considered. We investigate the estimation of a component of the mixture (a density) from the observations. A new adaptive estimator based on wavelets and a hard thresholding rule is constructed for this problem. Under mild assumptions on the model, we study its asymptotic properties by determining an upper bound of the mean integrated squared error over a wide range of Besov balls. We prove that the obtained upper bound is sharp.

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    Other literature type . 2013
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    Authors: Branker, Kadra; Pearce, Joshua;

    International audience; Solar photovoltaic (PV) technology is a means of increasing energy security whilst reducing the negative externalities of fossil fuel dependence. Programs, such as feed-in-tariffs (FITs) implemented in many countries for on-grid PV, provide economic incentives for investment. On the other hand, off-grid PV systems reduce energy poverty and increase both entrepreneurial productivity and return in rural isolated areas. Despite these social and economic justifications, there is still limited access to capital and appropriate financing mechanisms for the upfront cost, resulting in the slow uptake of solar PV under government programs, especially for poorer individuals. Peer-to-peer (P2P) lending networks represent an abundant untapped financial resource for accelerating the deployment of PV technology. This paper considers an innovative P2P lending framework for A) financing solar PV on-grid under a FIT program and B) off-grid for a small business, whilst distributing both the environmental and economic advantages throughout the entire population. The requirements and limitations of the proposed funding mechanisms are analyzed and conclusions are drawn.

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    Other literature type . 2011
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    Hal-Diderot
    Other literature type . 2011
    Data sources: Hal-Diderot
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      Other literature type . 2011
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      Other literature type . 2011
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    Authors: Bonald, Thomas; Haddad, Jean-Paul; Mazumdar, Ravi;

    In this paper we obtain approximations for variousperformance measures in a multirate link sharing bandwidthunder an insensitive sharing mechanism called balanced fairness.Balanced fairness can be viewed as the large system limit ofproportional fairness. For a large system, we obtain closed formexpressions for the calculation of long run fraction of time thatthe system is congested, the probability that an arriving flow willnot obtain its maximum bit rate and the average fraction of timethat an arriving flow is not allocated its maximum bit rate whilein the system. The techniques are based on local limit theoremsfor convolution measures. International audience

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    Other literature type . 2011
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    Authors: Semba Prasetiya, Fiddy;

    Le but de ce travail de doctorat est d’évaluer la possibilité d’utiliser Haslea ostrearia et la marennine en ostréiculture. Les objectives de ce projet sont : (1) l'évaluation du comportement alimentaire de l'huître creuse Crassostrea gigas sur des cellules d’H. ostrearia de différentes tailles et les conséquences potentielles sur les populations algales; (2) la caractérisation du verdissement par la marennine et ses conséquences sur la physiologie de C. gigas; (3) les conséquences du verdissement sur les traits comportementaux, physiologiques et biochimiques de plusieurs espèces de bivalves; (4) l'utilisation conjuguée d’H. ostrearia avec d'autres microalgues d’importance en aquaculture. Nos résultats suggèrent que la taille des cellules affecte considérablement le processus de selection d’H. ostrearia par l’huître. Cette étude démontre également que la forme extracellulaire de la marenninne contribue significativement au verdissement dans les mucocytes des branchies. Mis à part le verdissement des organes palléaux des bivalves, une concentration modérée de marennine (2 mg L-1) affecte les performances comportementales, physiologiques et biochimiques des bivalves. Néanmoins, ces effets pourraient être compensés par ses activités biologiques comme agent antibactérien naturel et source d’alimentation mixte d’algues en conchyliculture. This Ph.D. thesis focuses on several assessments to achieve the optimum benefit of utilization of marennine in the field of aquaculture. The study covers: (1) the assessment in feeding behavior of the Pacific oyster Crassostrea gigas on different sizes of Haslea ostrearia and its ecological consequence; (2) the characterization of the greening by marennine and its consequences on some physiological traits of on C. gigas. (3) the consequence of greening by marennine on behavioral, physiological and biochemical traits of bivalves; (4) the utilization of H. ostrearia and marennine in a combination diet with other microalgae relevant to aquaculture.Our results suggest that cell size impacts considerably the selection process of H. ostrearia by oyster. This study also demonstrates that the extracellular form of marennine contributes significantly to the greening in the mucocytes of the gills. Apart from greening the pallial organs of bivalves, marennine (2 mg L-1) affects the behavioural, physiological and biochemical performance. Nevertheless, these effects can be compensated for its biological activities such as natural antibacterial agent and use as a mixed algal diet for bivalve aquaculture.

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  • Authors: Tavallaeinejad, Mohammad; Legrand, Mathias; Païdoussis, Michael;

    International audience; A nonlinear fluid-elastic continuum model of a slender cantilevered plate subjected to axial flow directed from the free end to the clamped one, also known as the inverted flag problem, is proposed. A nonlinear unsteady slender wing theory is employed to express the fluid-related forces acting on the plate. It is based on potential flow theory for inviscid fluids. The Euler-Bernoulli beam theory with exact kinematics and inextensibility is employed to derive the nonlinear partial integro-differential equation governing the dynamics of the plate. Discretization in space is carried out via a conventional Galerkin scheme using the linear modeshapes of the cantilevered beam. A Newton solver is implemented to obtain equilibrium solutions and integration in time is conducted using Gear's backward differentiation formula. A bifurcation diagram in terms of flow velocity is constructed in order to gain insight on the stability and post-critical behaviour of the system. It is shown that the undeflected static equilibrium is stable prior to a supercritical Hopf bifurcation giving rise to a flapping motion around the undeflected static equilibrium. By further increasing the flow velocity, the flag displays flapping motions around deflected static equilibria and change to fully-deflected static states at even higher flow velocities. These predictions are in excellent agreement with existing experimental data available in the literature.

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    Authors: Garcia Alfaro, Joaquin; Barbeau, Michel; Kranakis, Evangelos;

    International audience; We define three privacy-preserving solutions to the problem of distributing secrets between manufacturers and vendors of items labeled with Electronic Product Code (EPC) Gen2 tags. The solutions rely on the use of an anonymous threshold secret sharing scheme that allows the exchange of blinded information between readers and tags. Moreover, our secret sharing scheme allows self-renewal of shares with secret preservation between asynchronous shareholders. The first two solutions address the eavesdropping and rogue scanning threats. The third solution mitigates as well tracking threats.

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    Authors: Behr, Michel; Llari, Maxime;

    Proceedings de la 3ème édition de la conférence internationale Simbio-M (2014). Organisée conjointement par l'IFSTTAR, Aix-Marseille Université, l'université de Coventry et CADLM, cette conférence se concentre sur les progrès des technologies de simulation dans les domaines des sciences du vivant et multiphysiques: Biomécanique, Biomatériaux et Biomédical. L'objectif de cette conférence est de partager et d'explorer les résultats dans les techniques d'analyse numérique et les outils de modélisation mathématique. Cette approche numérique permet des études prévisionnelles ou exploratoires dans les différents domaines des biosciences.

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    Other literature type . 2014
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    Authors: Prados, Ferran; Ashburner, John; Blaiotta, Claudia; Brosch, Tom; +24 Authors

    An important image processing step in spinal cord magnetic resonance imaging is the ability to reliably and accurately segment grey and white matter for tissue specific analysis. There are several semi- or fully-automated segmentation methods for cervical cord cross-sectional area measurement with an excellent performance close or equal to the manual segmentation. However, grey matter segmentation is still challenging due to small cross-sectional size and shape, and active research is being conducted by several groups around the world in this field. Therefore a grey matter spinal cord segmentation challenge was organised to test different capabilities of various methods using the same multi-centre and multi-vendor dataset acquired with distinct 3D gradient-echo sequences. This challenge aimed to characterize the state-of-the-art in the field as well as identifying new opportunities for future improvements. Six different spinal cord grey matter segmentation methods developed independently by various research groups across the world and their performance were compared to manual segmentation outcomes, the present gold-standard. All algorithms provided good overall results for detecting the grey matter butterfly, albeit with variable performance in certain quality-of-segmentation metrics. The data have been made publicly available and the challenge web site remains open to new submissions. No modifications were introduced to any of the presented methods as a result of this challenge for the purposes of this publication. Highlights • First grey matter spinal cord segmentation challenge. • Six institutions participated in the challenge and compared their methods. • Public available dataset from multiple vendors and sites. • The challenge web site remains open to new submissions.

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    UCL Discovery
    Article . 2017
    Data sources: UCL Discovery
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    NeuroImage
    Article . 2017
    License: Elsevier TDM
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      UCL Discovery
      Article . 2017
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      Article . 2017
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    Authors: Peters, James,;

    Cet article présente des présentations de groupe libres de formes triangulaires à trajectoire plane et de leurs nombres de Betti correspondants. Les chemins sont des cartes dans la théorie de l'homotopie. Les arêtes des triangles de chemins sont des chemins homotopes. Les principaux résultats de cet article sont que (1) chaque triangle de chemin a une présentation de groupe libre et (2) chaque triangle de chemin de chemin a une réalisation géométrique. This paper introduces free group presentations of planar path triangular shapes and their corresponding Betti numbers. Paths are maps in homotopy theory. The edges of path triangles are homotopic paths. Main results in this paper are that (1)every path triangle has a free group presentation and (2) every path path triangle has a geometric realization.

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    Authors: Tencer, Lukas; Režnáková, Marta; Cheriet, Mohamed;

    International audience; We present a novel approach towards signature recognition from spatio-temporal data. The data is obtained by recording gyroscope and accelerometer measurements from an embedded pen device. The idea of Universum learning was previously presented by Vapnik and recently popularized in machine learning community. It assumes that the decision boundary of a classifier lies close to data with high uncertainty. The quality of the final classifier strongly depends on a way how to choose the Universum data and also on the representation of original data. In our paper we use a novel approach of Universum learning to classify signature data, also we present our novel idea how to sample the Universum data. At last, we also find more effective representation of the signature data itself compared to the baseline method. These three novelties allow us to outperform previously published results by 4.89% / 5.58%.

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    Authors: P. Chaubey, Yogendra; Chesneau, Christophe; Doosti, Hassan;

    In this paper, a mixture model under multiplicative censoring is considered. We investigate the estimation of a component of the mixture (a density) from the observations. A new adaptive estimator based on wavelets and a hard thresholding rule is constructed for this problem. Under mild assumptions on the model, we study its asymptotic properties by determining an upper bound of the mean integrated squared error over a wide range of Besov balls. We prove that the obtained upper bound is sharp.

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    Authors: Branker, Kadra; Pearce, Joshua;

    International audience; Solar photovoltaic (PV) technology is a means of increasing energy security whilst reducing the negative externalities of fossil fuel dependence. Programs, such as feed-in-tariffs (FITs) implemented in many countries for on-grid PV, provide economic incentives for investment. On the other hand, off-grid PV systems reduce energy poverty and increase both entrepreneurial productivity and return in rural isolated areas. Despite these social and economic justifications, there is still limited access to capital and appropriate financing mechanisms for the upfront cost, resulting in the slow uptake of solar PV under government programs, especially for poorer individuals. Peer-to-peer (P2P) lending networks represent an abundant untapped financial resource for accelerating the deployment of PV technology. This paper considers an innovative P2P lending framework for A) financing solar PV on-grid under a FIT program and B) off-grid for a small business, whilst distributing both the environmental and economic advantages throughout the entire population. The requirements and limitations of the proposed funding mechanisms are analyzed and conclusions are drawn.

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    Hal-Diderot
    Other literature type . 2011
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