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Search Results: 1 - 10 of 213258 matches for " Gwéna?l Letombe "
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Gestion des externalités environnementales dans le bassin minier du Nord – Pas de Calais : une approche en termes de proximité
Gwénal Letombe,Bertrand Zuindeau
Développement Durable et Territoires , 2006,
Abstract: Cet article a pour objet l’application des catégories conceptuelles de la proximité à la problématique de gestion des externalités environnementales. Le cas d’étude est celui d’une zone d’ancienne industrialisation en reconversion – le bassin minier du Nord – Pas de Calais – soumise à un passif environnemental spécifique. Nous tentons de montrer que l’incertitude inhérente aux externalités induit, en premier lieu, une certaine faiblesse des proximités organisées, puis la construction de formes de proximités particulières, passant par des dispositifs régulatoires innovants. Le contenu de ces proximités, leur efficacité, leur lien avec la dynamique économique territoriale, sont analysés successivement. Managing the environmental externalities of the Nord – Pas de Calais coal field : a tentative approach in terms of proximity. The purpose of this article is to explore how the conceptual categories used in the proximity approach can be applied to such issues as the management of environmental externalities. The case study is the Nord – Pas de Calais coal field, a formerly industrial area. Consequently, we focus on the specific environmental damages in this area which is currently undergoing reconversion. The aim of this paper is to show that the uncertainty which is inherent to externalities induces some degree of weakness on the part of “organised proximities” at first, then the setting-up of specific forms of proximity via innovative regulatory tools. The contents of those proximities, their efficiency and their relevance to the local economic dynamics will be analysed successively.
On morphisms preserving infinite Lyndon words
Gwénal Richomme
Discrete Mathematics & Theoretical Computer Science , 2007,
Abstract: In a previous paper, we characterized free monoid morphisms preserving finite Lyndon words. In particular, we proved that such a morphism preserves the order on finite words. Here we study morphisms preserving infinite Lyndon words and morphisms preserving the order on infinite words. We characterize them and show relations with morphisms preserving Lyndon words or the order on finite words. We also briefly study morphisms preserving border-free words and those preserving the radix order.
A local balance property of episturmian words
Gwénal Richomme
Computer Science , 2007,
Abstract: We prove that episturmian words and Arnoux-Rauzy sequences can be characterized using a local balance property. We also give a new characterization of epistandard words and show that the set of finite words that are not factors of an episturmian word is not context-free.
Sudo-Lyndon
Gwénal Richomme
Computer Science , 2007,
Abstract: Based on Lyndon words, a new Sudoku-like puzzle is presented and some relative theoretical questions are proposed.
Existence of finite test-sets for k-power-freeness of uniform morphisms
Gwénal Richomme,Francis Wlazinski
Computer Science , 2005,
Abstract: A challenging problem is to find an algorithm to decide whether a morphism is k-power-free. We provide such an algorithm when k >= 3 for uniform morphisms showing that in such a case, contrarily to the general case, there exist finite test-sets for k-power-freeness.
On Quasiperiodic Morphisms
Florence Levé,Gwénal Richomme
Computer Science , 2013, DOI: 10.1007/978-3-642-40579-2_20
Abstract: Weakly and strongly quasiperiodic morphisms are tools introduced to study quasiperiodic words. Formally they map respectively at least one or any non-quasiperiodic word to a quasiperiodic word. Considering them both on finite and infinite words, we get four families of morphisms between which we study relations. We provide algorithms to decide whether a morphism is strongly quasiperiodic on finite words or on infinite words.
Quasiperiodic Sturmian words and morphisms
Florence Levé,Gwénal Richomme
Computer Science , 2006,
Abstract: We characterize all quasiperiodic Sturmian words: a Sturmian word is not quasiperiodic if and only if it is a Lyndon word. Moreover, we study links between Sturmian morphisms and quasiperiodicity.
Immunoreactivity of anti-gelsolin antibodies: implications for biomarker validation
Nicole Haverland, Gwnal Pottiez, Jayme Wiederin, Pawel Ciborowski
Journal of Translational Medicine , 2010, DOI: 10.1186/1479-5876-8-137
Abstract: Samples from human (plasma and CSF), monkey (plasma), monocyte-derived macrophage (supernatants), and commercial gelsolin (recombinant and purified) were quantitated using Western blot assay and a variety of anti-gelsolin antibodies. Plasma and CSF was used for immunoaffinity purification of gelsolin which was identified in eight bands by tandem mass spectrometry.Immunoreactivity of gelsolin within samples and between antibodies varied greatly. In several instances, multiple bands were identified (corresponding to different gelsolin forms) by one antibody, but not identified by another. Moreover, in some instances immunoreactivity depended on the source of gelsolin, e.g. plasma or CSF. Additionally, some smaller forms of gelsolin were identified by mass spectrometry but not by any antibody. Recombinant gelsolin was used as reference sample.Orthogonal validation using specific monoclonal or polyclonal antibodies may reject biomarker candidates from further studies based on misleading or even false quantitation of those proteins, which circulate in various forms in body fluids.The development of global proteomic profiling in the mid-1990 s raised the expectations for quick discovery of new biomarkers [1]. More importantly, it was expected that profiling of body fluids using high throughput, sensitive and specific methods would result in bringing new and approved diagnostic and therapeutic biomarkers from bench to bedside in a fast track manner [2]. However, soon after the first large profiling experiments were performed, researchers observed several major problems: (i) very high dynamic range of the expression of proteins in the body fluids can reach 1012 orders of magnitude, thereby excluding the possibility to quantitate both low and high abundance proteins without additional sample fractionation(s) [3]; (ii) range of concentration for any given protein varies from individual to individual in general population as well as in cohorts of patients; (iii) standard opera
Les indicateurs de développement professionnel
Gwénal Lefeuvre,Audrey Garcia,Ludmila Namolovan
Questions Vives : Recherches en éducation , 2011, DOI: 10.4000/questionsvives.627
Abstract: IntroductionLe développement professionnel est un thème très présent dans les écrits scientifiques et professionnels et dans les instances de formation initiale et continue mais ses définitions sont généralement peu stabilisées. Nous en trouvons une illustration dans le champ du travail enseignant. Les expressions développement professionnel et formation continue sont souvent synonymes (Brodeur, Deaudelin & Bru, 2005). Plusieurs écrits portant sur le développement professionnel privil...
Abelian Properties of Words (Extended abstract)
Gwénal Richomme,Kalle Saari,Luca Q. Zamboni
Mathematics , 2009,
Abstract: We say that two finite words $u$ and $v$ are abelian equivalent if and only if they have the same number of occurrences of each letter, or equivalently if they define the same Parikh vector. In this paper we investigate various abelian properties of words including abelian complexity, and abelian powers. We study the abelian complexity of the Thue-Morse word and the Tribonacci word, and answer an old question of G. Rauzy by exhibiting a class of words whose abelian complexity is everywhere equal to 3. We also investigate abelian repetitions in words and show that any infinite word with bounded abelian complexity contains abelian $k$-powers for every positive integer $k$.
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