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See detailOn Cobham's theorem
Durand, Fabien; Rigo, Michel ULg

in Handbook of Automata (in press)

Let k >= 2 be an integer. A set X of integers is k-recognizable if the language of k-ary representations of the elements in X is accepted by a finite automaton. The celebrated theorem of Cobham from 1969 ... [more ▼]

Let k >= 2 be an integer. A set X of integers is k-recognizable if the language of k-ary representations of the elements in X is accepted by a finite automaton. The celebrated theorem of Cobham from 1969 states that if a set of integers is both k-recognizable and ℓ-recognizable, then it is a finite union of arithmetic progressions. We present several extensions of this result to nonstandard numeration systems, we describe the relationships with substitutive and automatic words and list Cobham-type results in various contexts. [less ▲]

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See detailOn collaboration and competition in scientific community
Bessonov, Kyrylo ULg

Speech (2014)

Competition in sciences is increasing today to the levels that it becomes damaging to the scientific progress. In this talk we will talk about benefits of collaboration of healthy competition. Will also ... [more ▼]

Competition in sciences is increasing today to the levels that it becomes damaging to the scientific progress. In this talk we will talk about benefits of collaboration of healthy competition. Will also concentrate on negative aspects of competition and will provide detailed examples illustrating each of the negative points of stiff competition. In addition historical outlook of the scientific community organization and formalization of science will be briefly touched upon in the talk [less ▲]

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See detailOn Comparison Meaningfulness of Aggregation Functions
Marichal, Jean-Luc; Mathonet, Pierre ULg

in Journal of Mathematical Psychology (2001), 45(2), 213-223

This paper will give a description of all continuous functions which are comparison meaningful in the sense of measurement theory.

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See detailOn Conducting Burden-of-Osteoporosis Studies: A Review of the Core Concepts and Practical Issues. A Study Carried out under the Auspices of a Who Collaborating Center
Ben Sedrine, Wafa ULg; Radican, L.; Reginster, Jean-Yves ULg

in Rheumatology (2001), 40(1), 7-14

Osteoporosis is a problem that is relevant to public health from the clinical, economic and social viewpoints. Except in a handful of industrialized countries, there is a considerable void in our ... [more ▼]

Osteoporosis is a problem that is relevant to public health from the clinical, economic and social viewpoints. Except in a handful of industrialized countries, there is a considerable void in our knowledge of the magnitude of the problem. By exploring both the epidemiological and the economic impact of osteoporosis and the fractures associated with it in a particular country, studies of the 'burden of illness' (BOI) can fill that void. BOI analysis raises many questions at both the conceptual and the practical level. The purpose of this paper is to review the methodology underlying analyses of this type, to discuss its limitations and to provide a general format to improve their implementation in the field of osteoporosis. Investigators involved in BOI analysis should be very clear and explicit regarding the methods they adopt, so that studies in different countries can be interpreted and compared appropriately by interested parties. [less ▲]

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See detailOn conspiracism as part of populist ideology
Jamin, Jérôme ULg

Conference (2003)

Detailed reference viewed: 16 (0 ULg)
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See detailOn defining educational objectives
de Landsheere, Gilbert ULg; de Landsheere, Viviane ULg

in Evaluation in Education. International Progress (1977), (1), 73-190

Detailed reference viewed: 24 (0 ULg)
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See detailOn Deriving a Hybrid Model for Carbohydrate Uptake in Escherichia Coli
Bullinger, Eric ULg; Sauter, T.; Allgöwer, F. et al

in Proc. 15th IFAC World Congress (2002)

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See detailOn destabilizing implicit factors in discrete advection-diffusion equations
Beckers, Jean-Marie ULg

in Journal of Computational Physics (1994), 111(2), 260-265

In the present paper, we find necessary and sufficient stability conditions for a simple one-time step finite difference discretization of an N-dimensional advection-diffusion equation. Furthermore, it is ... [more ▼]

In the present paper, we find necessary and sufficient stability conditions for a simple one-time step finite difference discretization of an N-dimensional advection-diffusion equation. Furthermore, it is shown that when the implicit factors differ in each direction, a strange behavior occurs: By increasing one implicit factor in only one direction, a stable scheme can become unstable. It is thus suggested to use a single implicit direction (for efficient computing), or the same implicit factor in each direction. (C) 1994 Academic Press, Inc. [less ▲]

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See detailOn Dictatorship, Economic Development and Stability
Artige, Lionel ULg

Conference (2004, April)

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See detailOn dictatorship, economic development and stability
Artige, Lionel ULg

Conference (2003, March)

Detailed reference viewed: 28 (4 ULg)
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See detailOn different types of adjustment usable to calculate the parameters of the stream power law
Demoulin, Alain ULg; Beckers, Arnaud ULg; Bovy, Benoît ULg

in Geomorphology (2012), 138(1), 203-208

Model parameterization through adjustment to field data is a crucial step in the modeling and the understanding of the drainage network response to tectonic or climatic perturbations. Using as a test case ... [more ▼]

Model parameterization through adjustment to field data is a crucial step in the modeling and the understanding of the drainage network response to tectonic or climatic perturbations. Using as a test case a data set of 18 knickpoints that materialize the migration of a 0.7-Ma-old erosion wave in the Ourthe catchment of northern Ardennes (western Europe), we explore the impact of various data fitting on the calibration of the stream power model of river incision, from which a simple knickpoint celerity equation is derived. Our results show that statistical least squares adjustments (or misfit functions) based either on the streamwise distances between observed and modeled knickpoint positions at time t or on differences between observed and modeled time at the actual knickpoint locations yield significantly different values for the m and K parameters of the model. As there is no physical reason to prefer one of these approaches, an intermediate least-rectangles adjustment might at first glance appear as the best compromise. However, the statistics of the analysis of 200 sets of synthetic knickpoints generated in the Ourthe catchment indicate that the timebased adjustment is the most capable of getting close to the true parameter values. Moreover, this fitting method leads in all cases to an m value lower than that obtained from the classical distance adjustment (for example, 0.75 against 0.86 for the real case of the Ourthe catchment), corresponding to an increase in the non-linear character of the dependence of knickpoint celerity on discharge [less ▲]

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See detailOn differential passivity of physical systems
Forni, Fulvio ULg; Sepulchre, Rodolphe ULg; van der Schaft, Arjan

in 52nd IEEE Conference on Decision and Control (2013)

Differential passivity is a property that allows to check with a pointwise criterion that a system is incrementally passive, a property that is relevant to study interconnected systems in the context of ... [more ▼]

Differential passivity is a property that allows to check with a pointwise criterion that a system is incrementally passive, a property that is relevant to study interconnected systems in the context of regulation, synchronization, and estimation. The paper investigates how restrictive is the property, focusing on a class of open gradient systems encountered in the coenergy modeling framework of physical systems, in particular the Brayton-Moser formalism for nonlinear electrical circuits. [less ▲]

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See detailOn differentially dissipative dynamical systems
Forni, Fulvio ULg; Sepulchre, Rodolphe ULg

in IFAC-PapersOnLine website. (2013)

Dissipativity is an essential concept of systems theory. The paper provides an extension of dissipativity, named differential dissipativity, by lifting storage functions and supply rates to the tangent ... [more ▼]

Dissipativity is an essential concept of systems theory. The paper provides an extension of dissipativity, named differential dissipativity, by lifting storage functions and supply rates to the tangent bundle. Differential dissipativity is connected to incremental stability in the same way as dissipativity is connected to stability. It leads to a natural formulation of differential passivity when restricting to quadratic supply rates. The paper also shows that the interconnection of differentially passive systems is differentially passive, and provides preliminary examples of differentially passive electrical systems. [less ▲]

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See detailOn Disgust and the Curse of Matter
Delville, Michel ULg

Conference (2013, May 23)

Detailed reference viewed: 4 (0 ULg)
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See detailOn early land plants, including Cooksonia from Southern Gondwana
Gerrienne, Philippe ULg; Bergamaschi, S.; Pereira, E. et al

Conference (1999)

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See detailOn endostyle ultrastructure in two new species of doliolid-like tunicates
Compère, Philippe ULg; Godeaux, Jean

in Marine Biology (1997), 128

Detailed reference viewed: 7 (0 ULg)
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See detailOn Extended Finite Element Method (XFEM) for modelling of organ deformations associated with surgical cuts
Vigneron, Lara M.; Warfield, Simon K.; Verly, Jacques ULg

Conference (2004)

Detailed reference viewed: 6 (2 ULg)
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See detailOn generalized Hölder spaces
Kreit, Damien ULg; Nicolay, Samuel ULg

Poster (2011, June)

The Hölder spaces provide a natural way for measuring the smoothness of a function. These spaces appear in different areas such as approximation theory and multifractal analysis and lead to natural ... [more ▼]

The Hölder spaces provide a natural way for measuring the smoothness of a function. These spaces appear in different areas such as approximation theory and multifractal analysis and lead to natural definitions of the notion of fractal function; for example a function belonging to $C^\alpha$ with $\alpha\in (0,1)$ typically has a fractal graph. The purpose of this poster is to present a generalization of such spaces as well as some recent results about their characterizations. [less ▲]

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See detailOn generalized Hölder spaces
Kreit, Damien ULg

Conference (2011, January 21)

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See detailOn generalized Hölder-Zygmund spaces
Kreit, Damien ULg; Nicolay, Samuel ULg

Poster (2013, October 29)

The Hölder spaces provide a natural way for measuring the smoothness of a function. These spaces appear in different areas such as approximation theory and multifractal analysis. The purpose of this ... [more ▼]

The Hölder spaces provide a natural way for measuring the smoothness of a function. These spaces appear in different areas such as approximation theory and multifractal analysis. The purpose of this poster is to present a generalization of such spaces as well as some recent results about their characterizations. These spaces are a particular case of a generalization of Besov Spaces who have recently been extensively studied. [less ▲]

Detailed reference viewed: 36 (6 ULg)