Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailContinuous-state reinforcement learning with fuzzy approximation
Busoniu, Lucian; Ernst, Damien ULg; De Schutter, Bart et al

in Tuyls, K.; Nowé, A.; Guessoum, Z. (Eds.) et al Adaptive Agents and Multi-Agent Systems III, Adaptation and Multi-Agent Learning (2008)

Reinforcement learning (RL) is a widely used learning paradigm for adaptive agents. There exist several convergent and consistent RL algorithms which have been intensively studied. In their original form ... [more ▼]

Reinforcement learning (RL) is a widely used learning paradigm for adaptive agents. There exist several convergent and consistent RL algorithms which have been intensively studied. In their original form, these algorithms require that the environment states and agent actions take values in a relatively small discrete set. Fuzzy representations for approximate, model-free RL have been proposed in the literature for the more difficult case where the state-action space is continuous. In this work, we propose a fuzzy approximation architecture similar to those previously used for Q-learning, but we combine it with the model-based Q-value iteration algorithm. We prove that the resulting algorithm converges. We also give a modified, asynchronous variant of the algorithm that converges at least as fast as the original version. An illustrative simulation example is provided. [less ▲]

Detailed reference viewed: 49 (7 ULg)
Full Text
Peer Reviewed
See detailContinuous-state reinforcement learning with fuzzy approximation
Busoniu, Lucian; Ernst, Damien ULg; Babuska, Robert et al

in Proceedings of the 7th European Symposium on Adaptive Learning Agents and Multi-Agent Systems (ALAMAS-07) (2007)

Reinforcement learning (RL) is a widely used learning paradigm for adaptive agents. Well-understood RL algorithms with good convergence and consistency properties exist. In their original form, these ... [more ▼]

Reinforcement learning (RL) is a widely used learning paradigm for adaptive agents. Well-understood RL algorithms with good convergence and consistency properties exist. In their original form, these algorithms require that the environment states and agent actions take values in a relatively small discrete set. Fuzzy representations for approximate, model-free RL have been proposed in the literature for the more difficult case where the state-action space is continuous. In this work, we propose a fuzzy approximation structure similar to those previously used for Q-learning, but we combine it with the model-based Q-value iteration algorithm. We show that the resulting algorithm converges. We also give a modif ed, serial variant of the algorithm that converges at least as fast as the original version. An illustrative simulation example is provided. [less ▲]

Detailed reference viewed: 17 (3 ULg)
Full Text
Peer Reviewed
See detailContinuous-time susbspace flows related to the symmetric eigenvalue problem
Absil, Pierre-Antoine; Sepulchre, Rodolphe ULg; Mahony, Robert

in Pacific Journal of Optimization (2008), 4(2), 179--194

The classes of continuous-time flows on Rn×p that induce the same flow on the set of p-dimensional subspaces of Rn are described. The power flow is briefly reviewed in this framework, and a subspace ... [more ▼]

The classes of continuous-time flows on Rn×p that induce the same flow on the set of p-dimensional subspaces of Rn are described. The power flow is briefly reviewed in this framework, and a subspace generalization of the Rayleigh quotient flow [Linear Algebra Appl. 368C, 2003, pp. 343–357] is proposed and analyzed. This new flow displays a property akin to deflation in finite time. [less ▲]

Detailed reference viewed: 24 (7 ULg)
Full Text
Peer Reviewed
See detailA Continuum Damage Mechanics based bone remodelling model in a finite strain framework
Mengoni, Marlène ULg; Ponthot, Jean-Philippe ULg

in ECCM 2010, 4th European Conference on Computational Mechanics (2010)

Detailed reference viewed: 40 (9 ULg)
Full Text
See detailA Continuum Damage Mechanics Model for the Analysis of the Crashworthiness of Composite Structures: A work in progress
Chiu, Louis N S; Falzon, Brian G; Boman, Romain ULg

in Proceedings of the 15th Australian Aeronautical Conference (2013, February)

The crashworthiness capability of an aircraft structure is dependent on its ability to attenuate crash loading via the controlled deformation of energy absorbing devices. An energy-based constitutive ... [more ▼]

The crashworthiness capability of an aircraft structure is dependent on its ability to attenuate crash loading via the controlled deformation of energy absorbing devices. An energy-based constitutive relation was employed to model the behaviour of carbon fibre reinforced epoxy resin composite material under crush loading. Each of the damage modes in the fibre and matrix was treated separately with its own damage initiation and progression relationships as well as a damage parameter that tracks damage progression. Each damage parameter dictates the reduction in stiffness in the respective principal loading directions. This model was implemented for a 3D solid brick element in contrast to shell-based formulations currently available. Crushing composite structures were modelled and the results validated against experimental data. The force-displacement response / specific energy absorption and the failure modes obtained from the simulation show that the underlying physics of the crushing have been captured by the proposed model but that further work is required for reliable quantitative correlation. [less ▲]

Detailed reference viewed: 81 (8 ULg)
Full Text
Peer Reviewed
See detailA continuum damage model for alveolar bone remodeling
Mengoni, Marlène ULg; Ponthot, Jean-Philippe ULg

in Fourth International Conference on Advance COmputational Methods in ENgineering - ACOMEN 2008 (2008, May)

Detailed reference viewed: 68 (20 ULg)
Peer Reviewed
See detailThe continuum of cytokine involvement in the physiology of reproduction
Geenen, Vincent ULg; Hazee, Marie-Thérèse ULg; Goxe, Béatrice et al

in GENESIS (1995), 14

Detailed reference viewed: 11 (6 ULg)
See detailThe continuum of cytokine involvement in the reproductive process
Geenen, Vincent ULg

Conference (1995, September)

Detailed reference viewed: 4 (0 ULg)
Full Text
Peer Reviewed
See detailThe Continuum of Grief: From Scandinavian Mythology to Zen Buddhism: JanetFrame’s Intertextual Strategies in Snowman, Snowman
Gabrielle, Cindy ULg

in Sino-USEnglish Teaching (2012), 9(10), 1627-1636

In the wake of Richards Benton’s “Keats and Zen” (published in Philosophy East and West (1966)), this paper sets out to examine Janet Frame’s appropriation of Buddhist philosophy in Snowman, Snowman (1962 ... [more ▼]

In the wake of Richards Benton’s “Keats and Zen” (published in Philosophy East and West (1966)), this paper sets out to examine Janet Frame’s appropriation of Buddhist philosophy in Snowman, Snowman (1962). The novella’s allusions to a Buddhist-like epistemology, together with its subtle references to Scandinavian myths, however, have so far remained uncovered and are therefore best approached in the light of what has been called “the suppressed intertextuality in post-colonial writing”. The author’s intention in this paper is twofold: On the one hand, the author will suggest that post-colonial writers do not necessarily write against the Western canon and that maintaining the contrary amounts to vindicating the centrality of imperial texts in the contemporary literary scene—an endeavour which is hardly post-colonial. On the other hand, the author will go some way towards shifting eastward the core of Frame’s ontology by suggesting that her poetics is anchored not only in Western thinking, but also, perhaps more importantly so, in Eastern philosophy. The author’s primary impulse, however, in examining the interplay between canonical and peripheral intertextualities, is to illuminate in fundamental fashion the haunting beauty of the writer’s universe and the lyricism of Snowman, Snowman. [less ▲]

Detailed reference viewed: 26 (1 ULg)
Full Text
Peer Reviewed
See detailContinuum-level modelling of cellular adhesion and matrix production in aggregates.
Geris, Liesbet ULg; Ashbourn, Joanna M A; Clarke, Tim

in Computer Methods in Biomechanics & Biomedical Engineering (2011), 14(5), 403-10

Key regulators in tissue-engineering processes such as cell culture and cellular organisation are the cell-cell and cell-matrix interactions. As mathematical models are increasingly applied to investigate ... [more ▼]

Key regulators in tissue-engineering processes such as cell culture and cellular organisation are the cell-cell and cell-matrix interactions. As mathematical models are increasingly applied to investigate biological phenomena in the biomedical field, it is important, for some applications, that these models incorporate an adequate description of cell adhesion. This study describes the development of a continuum model that represents a cell-in-gel culture system used in bone-tissue engineering, namely that of a cell aggregate embedded in a hydrogel. Cell adhesion is modelled through the use of non-local (integral) terms in the partial differential equations. The simulation results demonstrate that the effects of cell-cell and cell-matrix adhesion are particularly important for the survival and growth of the cell population and the production of extracellular matrix by the cells, concurring with experimental observations in the literature. [less ▲]

Detailed reference viewed: 14 (3 ULg)
See detailLes contours de l'entreprise sociale
Marée, Michel ULg; Mertens de Wilmars, Sybille ULg

in Mertens de Wilmars, Sybille (Ed.) La gestion des entreprises sociales (2010)

Ce chapitre décrit d'abord successivement les éléments fondateurs du concept d'entreprise sociale, en précisant en quoi ce type d'entreprise constitue un "choix d'entreprendre" différent. Il passe ensuite ... [more ▼]

Ce chapitre décrit d'abord successivement les éléments fondateurs du concept d'entreprise sociale, en précisant en quoi ce type d'entreprise constitue un "choix d'entreprendre" différent. Il passe ensuite en revue les formes juridiques choisies par les entreprises sociales et donne un aperçu statistique de leur poids dans l'économie belge. Il présente également les grandes finalités qu'elles poursuivent et le modèle d'entreprise qu'elles mettent en oeuvre. Enfin, il énonce les questions de gestion que pose a priori ce modèle d'entreprise. [less ▲]

Detailed reference viewed: 335 (26 ULg)
See detailContours de la nouvelle mesure générale anti-abus
Bourgeois, Marc ULg

Report (2011)

Detailed reference viewed: 29 (7 ULg)
Full Text
Peer Reviewed
See detailContours et alentours de la notion de "simulation" en droit fiscal: 50 ans après "Brepols"
Nollet, Aymeric ULg

in Bourgeois, Marc; Richelle, Isabelle (Eds.) En quête de fiscalité, et autres propos... Mélanges offerts à Jean-Pierre Bours (2011)

Detailed reference viewed: 56 (16 ULg)
Full Text
See detailContours et statistiques du non-marchand en Belgique
Marée, Michel ULg; Mertens de Wilmars, Sybille ULg

Book published by Editions de l'Université de Liège (2002)

Detailed reference viewed: 182 (6 ULg)
Full Text
See detailContours statistiques des sociétés de l'économie sociale
Mertens de Wilmars, Sybille ULg; dujardin, Anne

in E-Note (2008), 6

L'article dresse les contours statistiques des deux ensembles de sociétés que l'on trouve dans le secteur de l'économie sociale : les sociétés coopératives agréées par le Conseil National de la ... [more ▼]

L'article dresse les contours statistiques des deux ensembles de sociétés que l'on trouve dans le secteur de l'économie sociale : les sociétés coopératives agréées par le Conseil National de la Coopération et les sociétés à finalité sociale. En utilisant les données reprises dans les grands fichiers statistiques officiels, il permet de situer ces organisations dans le contexte macroéconomique belge. [less ▲]

Detailed reference viewed: 180 (15 ULg)
Peer Reviewed
See detailContours, détours et alentours de la notion de « juste et adéquate compensation » – sanction de la théorie jurisprudentielle des troubles de voisinage en droit belge
Salvé, Arianne ULg

in Questions d’actualité en droit privé et en droit procédural - Journées trilatérales CAPITANT (2010, October)

Detailed reference viewed: 14 (3 ULg)
Full Text
See detailContr(ôl)e-fiction: de l'Empire à l'Interzone
Claisse, Frédéric ULg

in Multitudes (2012), 48(printemps), 106-117

The success of the notion of 'control' proposed by Deleuze and later developped by Negri and Hardt tends to obliterate its literary origins, ie. the work of William S. Burroughs. Yet, the American writer ... [more ▼]

The success of the notion of 'control' proposed by Deleuze and later developped by Negri and Hardt tends to obliterate its literary origins, ie. the work of William S. Burroughs. Yet, the American writer's logic of Control is based on the same ambivalent representation of power as a hold, according to which freedom is a mere lever serving to act upon an individual's possible actions. Restoring this Burroughsian filiation of Control emphasizes its counter-fictional dimension: in an outsideless word, practices such as cut-up or simulacrum reinvent our capacity of action. [less ▲]

Detailed reference viewed: 48 (12 ULg)
Full Text
Peer Reviewed
See detailContraception orale pour les kystes ovariens fonctionnels?
Belche, Jean-Luc ULg

in Minerva (2010), 9(3), 30-31

Cette synthèse méthodique des RCTs évaluant l’intérêt d’un traitement contraceptif oral pour traiter un kyste fonctionnel de l’ovaire chez une femme en âge de procréer montre la faible qualité ... [more ▼]

Cette synthèse méthodique des RCTs évaluant l’intérêt d’un traitement contraceptif oral pour traiter un kyste fonctionnel de l’ovaire chez une femme en âge de procréer montre la faible qualité méthodologique des trop rares études originales et l’absence de preuve de l’intérêt d’un tel traitement pour une affection à résolution très fréquemment spontanée. [less ▲]

Detailed reference viewed: 48 (4 ULg)