Publications

2017

• A Novel Range-Free Jammer Localization Solution in Wireless Network by Using PSO Algorithm
  
  • Pang Liang
  • Chen Xiao
  • Xue Zhi
  • Khatoun Rida
  , 2017, pp.198-211. (10.1007/978-981-10-6388-6_17)
  DOI : 10.1007/978-981-10-6388-6_17
• A sharp oracle inequality for Graph-Slope
  
  • Bellec Pierre C.
  • Salmon Joseph
  • Vaiter Samuel
  Electronic Journal of Statistics, Shaker Heights, OH : Institute of Mathematical Statistics, 2017, 11 (2), pp.4851-4870. Following recent success on the analysis of the Slope estimator, we provide a sharp oracle inequality in term of prediction error for Graph-Slope, a generalization of Slope to signals observed over a graph. In addition to improving upon best results obtained so far for the Total Variation denoiser (also referred to as Graph-Lasso or Generalized Lasso), we propose an efficient algorithm to compute Graph-Slope. The proposed algorithm is obtained by applying the forward-backward method to the dual formulation of the Graph-Slope optimization problem. We also provide experiments showing the practical applicability of the method. (10.1214/17-EJS1364)
  DOI : 10.1214/17-EJS1364
• A Landmark Detection Approach Applied to Robust Estimation of the Exposure Index in Digital Radiography
  
  • Irrera Paolo
  • Bloch Isabelle
  • Delplanque Maurice
  Innovation and Research in BioMedical engineering, Elsevier Masson, 2017, 38 (1), pp.42 - 55. Purpose. The exposure index is an important measure used in digital radiography to control the dose at the detector. This value should be computed in regions of interest that are adapted to each patient's anatomy and pose. Material and methods. We propose to define automatically these regions based on anatomical landmarks in the main structures of interest (head, tho-racic spine, lungs, lumbar spine, pelvis, femurs, knees, tibiae). This task is achieved by combining the global information on the size and the positions of the anatomical structures on the one hand, with local analysis on the other hand. Results. Experimental results, on a varied database of 82 full-body acquisitions , demonstrate the interest of the proposed approach, with less errors than existing approaches, in particular on frontal view acquisitions. The method is also robust to variations in patient's conditions and to the potential presence of metallic objects. Conclusion. The approach proposed in this paper allows consistently estimating exposure index values associated with different X-ray acquisitions. This suggests that the application of the proposed method to clinical practice is promising. (10.1016/j.irbm.2016.12.001)
  DOI : 10.1016/j.irbm.2016.12.001
• Mobilité résidentielle et sentiment d'attachement
  
  • Griffond-Boitier Anne
  • Valentin Jérôme
  , 2017, pp.237-253.
• Détection de l’eau dans les images radar du futur satellite SWOT
  
  • Lobry Sylvain
  • Fjortoft Roger
  • Denis L.
  • Tupin Florence
  , 2017.
• Organising Complexity: Hierarchies and Holarchies
  
  • Diaconescu Ada
  , 2017, pp.89-106.
• Segmentation d’IRM de cerveaux de nouveau-nés en quelques secondes à l’aide d’un réseau de neurones convolutif pseudo-3D et de transfert d’apprentissage
  
  • Xu Yongchao
  • Géraud Thierry
  • Bloch Isabelle
  , 2017.
• Vidéo-ethnographie des usages de Gallica. Une exploration au plus près de l’activité
  
  • Rollet Nicolas
  • Beaudouin Valérie
  • Garron Isabelle
  Document numérique - Revue des sciences et technologies de l'information. Série Document numérique, Hermès, 2017, 20. Dans l’objectif d’observer au plus près les parcours des utilisateurs et les spécificités de leurs pratiques sur la bibliothèque numérique Gallica, nous avons effectué des captations audiovisuelles des activités à l’écran, complétées par des entretiens d’autoconfrontation qui permettent d’élaborer du sens aux observations. Deux axes d’analyse découlent des données recueillies. Le premier porte sur les phénomènes de catégorisation et d’évaluation (d’une liste de résultats, d’un document) et souligne la façon dont une idée, guidée par des motifs et dynamisée par de la sérendipité, peut émerger et se configurer dans le temps de la consultation. Le second explore la dimension écologique de l’usage de Gallica. Il met en lumière que l’utilisateur de Gallica est engagé dans de nombreuses opérations structurantes associant environnement numérique, matériel et social. (10.3166/dn.2017.00014)
  DOI : 10.3166/dn.2017.00014
• Visual Menu Techniques
  
  • Bailly Gilles
  • Lecolinet Éric
  • Nigay Laurence
  ACM Computing Surveys, Association for Computing Machinery, 2017, 49 (4), pp.60. Menus are used for exploring and selecting commands in interactive applications. They are widespread in current systems and used by a large variety of users. As a consequence, they have motivated many studies in Human-Computer Interaction (HCI). Facing the large variety of menus, it is difficult to have a clear understanding of the design possibilities and to ascertain their similarities and differences. In this article, we address a main challenge of menu design: the need to characterize the design space of menus. To do this, we propose a taxonomy of menu properties that structures existing work on visual menus. In order to highlight the impact of the properties on performance, we begin by refining performance through a list of quality criteria and by reviewing existing analytical and empirical methods for quality evaluation. The taxonomy of menu properties is an unavoidable step toward the elaboration of advanced predictive models of menu performance and the optimization of menus. A key point of this work is to focus both on menus and on the properties of menus, to enable a fine-grained analysis in terms of performance. (10.1145/3002171)
  DOI : 10.1145/3002171
• Reassigned Time-Frequency Representations of Discrete Time Signals and Application to the Constant Q Transform
  
  • Fenet Sébastien
  • Badeau Roland
  • Richard Gael
  Signal Processing, Elsevier, 2017, 132, pp.170-176. In this paper we provide a formal justification of the use of time-frequency reassignment techniques on time-frequency transforms of discrete time signals. State of the art techniques indeed rely on formulae established in the continuous case which are applied, in a somehow inaccurate manner, to discrete time signals. Here, we formally derive a general framework for discrete time reassignment. To illustrate its applicability and generality, this framework is applied to a specific transform: the Constant Q Transform. (10.1016/j.sigpro.2016.10.008)
  DOI : 10.1016/j.sigpro.2016.10.008
• Method, device, and computer program for generating timed media data
  
  • Denoual Franck
  • Mazé Frédéric
  • Le Feuvre J.
  • Ouedraogo Nael
  • Taquet Jonathan
  , 2017.
• A User Perception--Based Approach to Create Smiling Embodied Conversational Agents
  
  • Ochs Magalie
  • Pelachaud Catherine
  • Mckeown Gary
  ACM Transactions on Interactive Intelligent Systems, Association for Computing Machinery (ACM), 2017, 7 (1), pp.4. In order to improve the social capabilities of embodied conversational agents, we propose a computational model to enable agents to automatically select and display appropriate smiling behavior during human-machine interaction. A smile may convey different communicative intentions depending on subtle characteristics of the facial expression and contextual cues. So, to construct such a model, as a first step, we explore the morphological and dynamic characteristics of different types of smile (polite, amused and embarrassed smiles) that an embodied conversational agent may display. The resulting lexicon of smiles is based on a corpus of virtual agent's smiles directly created by users and analyzed through a machine learning technique. Moreover, during an interaction, the expression of smile impacts on the observer's perception of the interpersonal stance of the speaker. As a second step, we propose a probabilistic model to automatically compute the user's potential perception of the embodied conversational agent's social stance depending on its smiling behavior and on its physical appearance. This model, based on a corpus of users' perception of smiling and non-smiling virtual agents, enables a virtual agent to determine the appropriate smiling behavior to adopt given the interpersonal stance it wants to express. An experiment using real human-virtual agent interaction provided some validation of the proposed model. (10.1145/2925993)
  DOI : 10.1145/2925993
• Framework to Relate / Combine Modeling Languages and Techniques
  
  • Al-Ali Rima
  • Amrani Moussa
  • Bandyopadhyay Soumyadip
  • Barisic Ankica
  • Barros Fernando
  • Blouin Dominique
  • Erata Ferhat
  • Giese Holger
  • Iacono Mauro
  • Klikovits Stefan
  • Navarro Eva
  • Pelliccione Patrizio
  • Taveter Kuldar
  • Tekinerdogan Bedir
  • Vanherpen Ken
  , 2017.
• A Controlled Matching Game for WLANs
  
  • Touati Mikael
  • El-Azouzi Rachid
  • Coupechoux Marceau
  • Altman Eitan
  • Kelif Jean-Marc
  IEEE Journal on Selected Areas in Communications, Institute of Electrical and Electronics Engineers, 2017, 35, pp.707 - 720. In multi-rate IEEE 802.11 WLANs, the traditional user association based on the strongest received signal and the well known anomaly of the MAC protocol can lead to overloaded Access Points (APs), and poor or heterogeneous performance. Our goal is to propose an alternative game-theoretic approach for association. We model the joint resource allocation and user association as a matching game with complementarities and peer effects consisting of selfish players solely interested in their individual throughputs. Using recent game-theoretic results we first show that various resource sharing protocols actually fall in the scope of the set of stability-inducing resource allocation schemes. The game makes an extensive use of the Nash bargaining and some of its related properties that allow to control the incentives of the players. We show that the proposed mechanism can greatly improve the efficiency of 802.11 with heterogeneous nodes and reduce the negative impact of peer effects such as its MAC anomaly. The mechanism can be implemented as a virtual connectivity management layer to achieve efficient APs-user associations without modification of the MAC layer. (10.1109/JSAC.2017.2672258)
  DOI : 10.1109/JSAC.2017.2672258
• Better Product Quality May Lead to Lower Product Price
  
  • Chenavaz Régis
  The B.E. Journal of Theoretical Economics, 2017, 17 (1), pp.1--22. This article analyzes the conditions under which better product quality implies higher or lower product price. In an optimal control framework, I make the following assumptions: The firm sets the dynamic pricing and product innovation policies; product innovation raises quality, which drives production cost, and consumers are sensitive to price and quality. I derive a rule of price-quality relationship that stresses the influence of quality on price through the effects of cost (positive), sales (negative), and markup (positive). This article shows that, while maximizing profit and despite a quality and cost increases, the firm may decrease product prices because of the possibility of generating more sales as a result of combining better quality with lower price. This sales effect solves the puzzle of a negative price-quality relationship. More generally, the sales effect mitigates the ability of price to convey information about quality. (10.1515/bejte-2015-0062)
  DOI : 10.1515/bejte-2015-0062