Last 7 days     Results 421-440 of 37434.   17 18 19 20 21 22 23 24 25 26 27   Another Generalization of Abelian Equivalence: Binomial Complexity of Infinite Words (long version)Rigo, Michel ; Salimov, Pavelin Theoretical Computer Science (in press)The binomial coefficient of two words $u$ and $v$ is the number of times $v$ occurs as a subsequence of $u$. Based on this classical notion, we introduce the $m$-binomial equivalence of two words refining ... [more ▼]The binomial coefficient of two words $u$ and $v$ is the number of times $v$ occurs as a subsequence of $u$. Based on this classical notion, we introduce the $m$-binomial equivalence of two words refining the abelian equivalence. Two words $x$ and $y$ are $m$-binomially equivalent, if, for all words $v$ of length at most $m$, the binomial coefficients of $x$ and $v$ and respectively, $y$ and $v$ are equal. The $m$-binomial complexity of an infinite word $x$ maps an integer $n$ to the number of $m$-binomial equivalence classes of factors of length $n$ occurring in $x$. We study the first properties of $m$-binomial equivalence. We compute the $m$-binomial complexity of two classes of words: Sturmian words and (pure) morphic words that are fixed points of Parikh-constant morphisms like the Thue--Morse word, i.e., images by the morphism of all the letters have the same Parikh vector. We prove that the frequency of each symbol of an infinite recurrent word with bounded $2$-binomial complexity is rational. [less ▲]Detailed reference viewed: 11 (1 ULg) Defining multiplication in some additive expansions of polynomial ringsPoint, Françoise; Rigo, Michel ; Waxweiler, Laurentin Communications in Algebra (in press)Adapting a result of R. Villemaire on expansions of Presburger arithmetic, we show how to define multiplication in some expansions of the additive reduct of certain Euclidean rings. In particular, this ... [more ▼]Adapting a result of R. Villemaire on expansions of Presburger arithmetic, we show how to define multiplication in some expansions of the additive reduct of certain Euclidean rings. In particular, this applies to polynomial rings over a finite field. [less ▲]Detailed reference viewed: 9 (2 ULg) An analogue of Cobham's theorem for graph directed iterated function systemsCharlier, Emilie ; Leroy, Julien ; Rigo, Michel in Advances in Mathematics (in press)Feng and Wang showed that two homogeneous iterated function systems in $\mathbb{R}$ with multiplicatively independent contraction ratios necessarily have different attractors. In this paper, we extend ... [more ▼]Feng and Wang showed that two homogeneous iterated function systems in $\mathbb{R}$ with multiplicatively independent contraction ratios necessarily have different attractors. In this paper, we extend this result to graph directed iterated function systems in $\mathbb{R}^n$ with contraction ratios that are of the form $\frac{1}{\beta}$, for integers $\beta$. By using a result of Boigelot {\em et al.}, this allows us to give a proof of a conjecture of Adamczewski and Bell. In doing so, we link the graph directed iterated function systems to Büchi automata. In particular, this link extends to real numbers $\beta$. We introduce a logical formalism that permits to characterize sets of $\mathbb{R}^n$ whose representations in base $\beta$ are recognized by some Büchi automata. This result depends on the algebraic properties of the base: $\beta$ being a Pisot or a Parry number. The main motivation of this work is to draw a general picture representing the different frameworks where an analogue of Cobham's theorem is known. [less ▲]Detailed reference viewed: 22 (5 ULg) Glioblastoma-derived extracellular vesicles induce tumor-supportive phenotypes in monocytic cellsde Vrij, Jeroen; Maas, Sybren; Kwappenberg, Kitty et alin International Journal of Cancer = Journal International du Cancer (in press)Detailed reference viewed: 9 (1 ULg) High Resolution postontrast time of flight MR angiography of intracranial perforators at 7.0 TeslaHarteveld, A; de Cocker, L; Dieleman, N et alin American Journal of Neuroradiology (in press)Detailed reference viewed: 4 (0 ULg) Éclairer les enjeux de la reconstruction industrielle du bassin liégeois : l'apport des archives des Etablissements insalubres et dangereux (1919-1925)Peters, Arnaud ; Defechereux, Olivier ; Destatte, Julien in Parmentier, Isabelle (Ed.) Actes des Deuxièmes Rencontres d'Histoire de l'Environnement en Belgique (Belgique, Luxembourg, Congo, Rwanda, Burundi) (in press)Detailed reference viewed: 36 (17 ULg) The utility of Google Scholar when searching geographical literature: comparison with three commercial bibliographic databasesStirbu, Simona ; Thirion, Paul ; Schmitz, Serge et alin Journal of Academic Librarianship (in press)This study aims to highlight what benefits, if any, Google Scholar (GS) has for academic literature searches in the field of geography, compared to three commercial bibliographic databases: Web of Science ... [more ▼]This study aims to highlight what benefits, if any, Google Scholar (GS) has for academic literature searches in the field of geography, compared to three commercial bibliographic databases: Web of Science (WoS) and FRANCIS (multidisciplinary databases) and GeoRef (specialized in geosciences). To ensure a valid comparison, identical bibliographic searches were applied using each of the four bibliographic tools. To exclude automatic variations of the ten keywords tested, they were placed between quotation marks and searched only in the “title” field of the respective search tools’ interfaces. The results were limited to bibliographic references published from 2005 to 2009. In order to assess the repeatability of the results, the exact same process was repeated monthly between November 2010 and July 2011. Initially the whole set of results was analyzed, after which the search results for two keywords (selected since they yielded a manageable number of results) were studied in more detail. The results indicate that GS search results show a large degree of overlap with those of the other databases but, moreover, yield numerous unique hits, which should be useful to researchers in both the fields of human and physical geography. GS leads the other tools widely on number of results, independently of keyword, subfield, year of publication, or time of search. [less ▲]Detailed reference viewed: 94 (38 ULg) Using kernels and ecological niche modelling to delineate conservation areas in an endangered patch-breeding phenotypeDenoël, Mathieu ; Ficetola, Francescoin Ecological Applications (in press)Efficient delineation of conservation areas is a great challenge in maintaining biodiversity. Kernel density estimators (KDEs) are a powerful tool in this perspective, but they have not been applied at ... [more ▼]Efficient delineation of conservation areas is a great challenge in maintaining biodiversity. Kernel density estimators (KDEs) are a powerful tool in this perspective, but they have not been applied at the population level on patch-distributed organisms. This would be particularly worthy for species that need broad habitats beyond those where they can be sampled; such as terrestrial lands for pond-breeding amphibians. The aim of this study was to compare different approaches for the identification of suitable areas for conservation: KDE, ecological niche modelling, and a combination of KDE and niche models. Paedomorphosis was chosen as a model system because this is an important form of intraspecific variation that is present in numerous taxa, but geographically localized within species and globally endangered. 277 ponds were sampled in one of the hotspots of paedomorphosis to determine the abundance and distribution of paedomorphs (i.e. individuals retaining gills at the adult stage) of the palmate newt (Lissotriton helveticus), with emphasis on the connections between the most valuable populations. KDEs gave insights into the surface areas required to balance the maintenance of certain number of connected ponds and the respective number of disjoint areas in which the whole population is divided. The inclusion of barriers in the models helped in accurately designing the limits of the areas to protect. Alone, habitat models were not able to successfully delineate the area to protect, but the integration between terrestrial suitable areas or barriers and KDE allowed an objective identification of areas required for conservation. Overall, the best performance was observed by the KDE integrating ecological barriers, and by the combination between KDE and niche modelling. In a broader perspective, KDEs are thus a pertinent tool in providing quantitative spatial measurements to delineate conservation areas based on patch-abundance data with a specific focus to connectivity. [less ▲]Detailed reference viewed: 59 (30 ULg) Moyens et enjeux d’une approche didactique des IlluminationsSaint-Amand, Denis in Parade Sauvage (in press), 25Detailed reference viewed: 23 (5 ULg) Towards a framework for assessment and management of cumulative human impacts on marine food websGiakoumi, Sylvaine; Halpern, Benjamin S.; Michel, Loïc et alin Conservation Biology (in press)Effective ecosystem-based management requires understanding ecosystem responses to multiple human threats, rather than focusing on single threats. To understand ecosystem responses to anthropogenic ... [more ▼]Effective ecosystem-based management requires understanding ecosystem responses to multiple human threats, rather than focusing on single threats. To understand ecosystem responses to anthropogenic threats holistically, it is necessary to know how threats affect different components within ecosystems and ultimately alter ecosystem functioning. We used a case study of a Mediterranean seagrass (Posidonia oceanica) food web and expert knowledge elicitation in an application of the initial steps of a framework for assessment of cumulative human impacts on food webs. We produced a conceptual seagrass food web model, determined the main trophic relationships, identified the main threats to the food web components, and assessed the components’ vulnerability to those threats. Some threats had high (e.g., coastal infrastructure) or low impacts (e.g., agricultural runoff) on all food web components, whereas others (e.g., introduced carnivores) had very different impacts on each component. Partitioning the ecosystem into its components enabled us to identify threats previously overlooked and to reevaluate the importance of threats commonly perceived as major. By incorporating this understanding of system vulnerability with data on changes in the state of each threat (e.g., decreasing domestic pollution and increasing fishing) into a food web model, managers may be better able to estimate and predict cumulative human impacts on ecosystems and to prioritize conservation actions. [less ▲]Detailed reference viewed: 38 (13 ULg) Le Mur et le masque. À propos de Banksy.Saint-Amand, Denis in MethIS : Méthodes et Interdisciplinarité en Sciences Humaines (in press)Detailed reference viewed: 46 (8 ULg) À propos de l’écologie du discours heuristiqueJob, Pierre ; Gilot, Marguerite in Actes du 4ième congrès international sur la théorie anthropologique du didactique (TAD) : Évolutions contemporaines du rapport aux mathématiques et aux autres savoirs à l'école et dans la société (in press)Detailed reference viewed: 12 (1 ULg) Inventer. Le jeune Descartes et les voies de l’inventio en 1619-1620Dubouclez, Olivier in Savini, Massimiliano (Ed.) Les écrits de jeunesse de Descartes (in press)Detailed reference viewed: 15 (2 ULg) Imaginer-lire le CapitalPieron, Julien in Cahiers d'Etudes Germaniques (in press)Detailed reference viewed: 11 (0 ULg) Dialectique de l’inattendu. Voies et impasses de la philosophie dans l’œuvre de Valère NovarinaDubouclez, Olivier in Née, Laure (Ed.) Valère Novarina (in press)Novarina entretient avec la philosophie une relation faite d’attraction et de défiance. Le primat accordé à la parole et le refus de toute ontologie le conduisent à définir un nouveau modèle théorique ... [more ▼]Novarina entretient avec la philosophie une relation faite d’attraction et de défiance. Le primat accordé à la parole et le refus de toute ontologie le conduisent à définir un nouveau modèle théorique, celui de la « fugue » et, tout en poursuivant le dialogue avec les philosophes, à construire ce que nous appellerons une dialectique de l’inattendu, mouvement par lequel le vide actif qui habite la personne humaine nourrit le renouvellement de la pensée et de l’action. [less ▲]Detailed reference viewed: 17 (2 ULg) Compte rendu de l'ouvrage de Cl. Prêtre, "Kosmos et kosmema. Les offrandes de parure dans les inventaires déliants"Veymiers, Richard in Revue archéologique (in press)Detailed reference viewed: 31 (2 ULg) Sartre em psicologia clínica: situação, emoção e ultrapassandoEnglebert, Jérôme in Ribeiro Scheider, Daniela; Gastal de Castro, Fernando; Bloc Boris, Georges (Eds.) Sartre e os desafios para a psicologia contemporânea (in press)À travers ce chapitre, nous proposons de réaliser l’étude de différents apports de la philosophie de Jean-Paul Sartre à la réflexion et la pratique de la psychopathologie. La « psychopathologie de l’homme ... [more ▼]À travers ce chapitre, nous proposons de réaliser l’étude de différents apports de la philosophie de Jean-Paul Sartre à la réflexion et la pratique de la psychopathologie. La « psychopathologie de l’homme en situation » qui s’esquisse repose sur la notion fondamentale de l’émotion ainsi que sur la possibilité de dépassement de cette situation. Ce moment fait jaillir une trame temporelle puisqu’il révèle à la fois l’histoire et la biographie du sujet, mais également son projet et dès lors les fulgurances de la liberté. Penser l’homme en situation, le savoir sorcier ou magicien (c’est-à-dire à la fois ému et émouvant) et parvenir à mobiliser sa narrativité sont des paris essentiels de l’œuvre de Sartre, que la psychopathologie, tant dans sa dimension théorique que pratique, ne peut ignorer. [less ▲]Detailed reference viewed: 18 (4 ULg) Hommage à Luc CollèsDefays, Jean-Marc ; Géron, GenevièveBook published by Editions Modulaires Européennes (in press)Detailed reference viewed: 23 (1 ULg) Qu'est-ce qu'un indicateur ? Paradigme indiciaire et processus de gouvernementalitéPetteni, Oriane in Nicolas, Loic (Ed.) L'indice (in press)Detailed reference viewed: 14 (0 ULg) L’utilisation du facteur de Bayes pour identifier les étudiants qui répondent au hasardBéland, Sébastien; Raîche, Gilles; Magis, David in Revue des Sciences de l'Education (in press)Les méthodes permettant de détecter les réponses au hasard dans l’évaluation des apprentissages présentent quelques limites. Par exemple, les indices de détection de patrons de réponses inappropriés ... [more ▼]Les méthodes permettant de détecter les réponses au hasard dans l’évaluation des apprentissages présentent quelques limites. Par exemple, les indices de détection de patrons de réponses inappropriés (person-fit indexes) nécessitent généralement de grandes bases de données et permettent seulement de dire si un étudiant répond en accord ou non avec un modèle de mesure (par exemple, le modèle de Rasch). Dans le cadre de cet article, nous présentons une nouvelle approche permettant d’identifier les étudiants qui répondent au hasard lors d'épreuves d'évaluation des apprentissages. Après avoir discuté des limites des principales approches existantes, nous exposons les détails techniques de l'utilisation du facteur de Bayes pour évaluer un nombre fini d'hypothèses informatives. Ensuite, nous appliquons le facteur de Bayes à des données simulées et des données réelles obtenues à des fins d’illustration. Les résultats permettent de voir que le facteur de Bayes est une méthode prometteuse pour détecter le comportement de réponse au hasard. [less ▲]Detailed reference viewed: 16 (0 ULg)