Focus in Ewe

International audience—In this paper, a strides detection algorithm is proposed using inertial sensors worn on the ankle. This innovative approach based on geometric patterns can detect both normal walking strides and atypical strides such as small steps, side steps and backward walking that existing methods struggle to detect. It is also robust in critical situations, when for example the wearer is sitting and moving the ankle, while most algorithms in the literature would wrongly detect strides

Inter-organizational communities of practice: specificities and stakes

Inter-organizational communities of practice (IOCoPs) are today an emergent research topic and studies in this area are still in an exploratory phase. Theoretical mechanisms are vaguely specified and empirical studies are incipient. For this reason, this paper firstly aims at presenting the specificities and stakes of such organizational forms, establishing reference points for further research in this field. We will introduce the main features of IOCoPs and explain why they do not represent a mere subcategory of CoPs, but a unit of analysis per se. In this paper, we will follow a thematic approach to indicate IOCoPs’ specificities and stakes. We will thus look at the IOCoPs’ actors (in part I), IOCoPs as original organizational forms (part II), then IOCoPs’ life cycle (part III). Finally, we will synthesize IOCoPs’ distinctive features and conclude with a discussion on key interests of IOCoPs for both practitioners and academics.Community of practice; inter-organizational relationships; professional practice; expertise; knowledge management; learning; organizational boundaries; life-cycle

Rates of convergence for robust geometric inference

Distances to compact sets are widely used in the field of Topological Data Analysis for inferring geometric and topological features from point clouds. In this context, the distance to a probability measure (DTM) has been introduced by Chazal et al. (2011) as a robust alternative to the distance a compact set. In practice, the DTM can be estimated by its empirical counterpart, that is the distance to the empirical measure (DTEM). In this paper we give a tight control of the deviation of the DTEM. Our analysis relies on a local analysis of empirical processes. In particular, we show that the rates of convergence of the DTEM directly depends on the regularity at zero of a particular quantile fonction which contains some local information about the geometry of the support. This quantile function is the relevant quantity to describe precisely how difficult is a geometric inference problem. Several numerical experiments illustrate the convergence of the DTEM and also confirm that our bounds are tight

Data driven estimation of Laplace-Beltrami operator

Approximations of Laplace-Beltrami operators on manifolds through graph Lapla-cians have become popular tools in data analysis and machine learning. These discretized operators usually depend on bandwidth parameters whose tuning remains a theoretical and practical problem. In this paper, we address this problem for the unnormalized graph Laplacian by establishing an oracle inequality that opens the door to a well-founded data-driven procedure for the bandwidth selection. Our approach relies on recent results by Lacour and Massart [LM15] on the so-called Lepski's method

Penser et panser la société : Défis et perspectives de l’anthropologie russe postsoviétique (note de recherche)

Dans cet article, l’auteur examine quelques-uns des aspects les plus saillants de l’actuelle problématisation de la société pour l’anthropologie russe. À travers des repositionnements méthodologiques, conceptuels et identitaires directement liés au retour du politique en tant que champ d’étude et de la politique en tant que domaine de compétence, les anthropologues russes s’attachent notamment à négocier les nouvelles contraintes liées à la mise en concurrence et au financement de la recherche. Il s’agit en effet pour eux de mettre en place un nouveau mode opératoire reposant sur l’utilité et le rebranchement de l’anthropologie russe avec sa société.In this article, the author deals with some of the most projecting aspects of the current problematization of Society for Russian anthropology. Rethinking methodological, conceptual and the disciplinary identity directly related to the “come back” of politics as a field of study and as a field of competence, the Russian anthropologists are currently expecting to negotiate the new constraints related on competition and granting of research. Indeed Russian anthropologists have to set up a new disciplinary procedure based on the utility and the reconnection of Russian anthropology with its own society.En este artículo, el autor examina algunos de los aspectos más sobresalientes de la problematización actual de la sociedad por la antropología rusa. Mediante re-posicionamientos metodológicos, conceptuales e identitarios directamente ligados al retorno de lo político en tanto que terreno de estudio y de la política en tanto que área de competencia, los antropólogos rusos se inclinan sobre todo a negociar las nuevas obligaciones ligadas a la competencia y al financiamiento de la investigación. En efecto, ellos tienen que organizar un nuevo modo operatorio basado en la utilidad y el reconexión de la antropología rusa con su sociedad