On the use of adhesion parameters to validate models specified using systems of affine differential equations

E-print/Working paper (2012)

A strategy for the selection of system of differential equations is proposed based on Bayesian ODE-penalized B-spline approach. It estimates the ODE parameters, approximates the solution of the ODE model ... [more ▼]

A strategy for the selection of system of differential equations is proposed based on Bayesian ODE-penalized B-spline approach. It estimates the ODE parameters, approximates the solution of the ODE model and quantifies the suitability of the proposed differential equations to model the dynamics of the observed state functions. Simulation study confirms that these ODE-adhesion parameters are able to question a system of differential equations as a descriptor of the dynamics in the state functions. This methodology is illustrated on a pharmacokinetic study. [less ▲]

Analyse des débits en période de tarissement : Essai d'une typologie régionale appliquée à des rivières du bassin de la Meuse (Belgique)

in Bulletin de la Société Géographique de Liège (2012), 59

Low flow discharge was analysed in twenty-five rivers of the midlands and highlands of Belgium, particularly during periods when base flow was supplied by aquifers. Recession curves were elaborated: these ... [more ▼]

Low flow discharge was analysed in twenty-five rivers of the midlands and highlands of Belgium, particularly during periods when base flow was supplied by aquifers. Recession curves were elaborated: these were “sequence curves” and not “tangent curves”. In general, two recession coefficients may be identified. In addition, we determined the percentage of “rapid runoff flood” within a regional perspective. It is apparent that this flow varies with the level of the water table. We also tried to estimate the groundwater recharge used in Thornthwaite’s simplified model. This was undertaken by estimating the amount of rain needed before observing a significant increase in discharge, following pronounced drought episodes such as those of 1976 and 2003. Finally, working on discharges during periods of low flow, we looked at the role of beaver dams as a factor contributing to low flow, as has been suggested recently in the literature. From our observations, it appears beaver dams do not influence the characteristic low flow discharge. Furthermore, an analysis of the evolution of the characteristic low flow dicsharge in rivers where there are no beaver dams shows some variability. This leads us, first of all, to qualify the influence of beaver dams, at least on the hydrological regime of these water courses (which are always located at the top of the watershed) but also to question the relevance of characteristic low flow discharge as a descriptor of low flow. [less ▲]

Althusser, mises en scène

Conference (2012)

An Introduction to International Migration Studies. European Perspectives

Book published by Amsterdam University Press (2012)

Solar Organic Rankine Cycle

Poster (2012)

Connectivity graph analysis of the auditory resting state network in tinnitus.

in Brain Research (2012), 1485

Thirteen chronic tinnitus patients and fifteen age-matched healthy controls were studied on a 3T magnetic resonance imaging (MRI) scanner during resting condition (i.e. eyes closed, no task performance ... [more ▼]

Thirteen chronic tinnitus patients and fifteen age-matched healthy controls were studied on a 3T magnetic resonance imaging (MRI) scanner during resting condition (i.e. eyes closed, no task performance). The auditory resting-state component was selected using an automatic component selection approach. Functional connectivity (correlations/anti-correlations) in the extracted network was portrayed by integrating the independent component analysis (ICA) approach with a graph theory method. Tinnitus and control groups showed different graph connectivity patterns. In the control group, the connectivity graph was divided into two distinct anti-correlated networks. The first one encompassed the auditory cortices and the insula. The second one encompassed frontoparietal and anterior cingulate cortices, brainstem, amygdala, basal ganglia/nucleus accumbens and parahippocampal regions. In the tinnitus group, only one of the two previously described networks was observed, encompassing the auditory cortices and the insula. Direct group comparison showed, in the tinnitus group, an increased functional connectivity between auditory cortices and the left parahippocampal region surviving multiple comparisons. We investigated a possible correlation between four tinnitus relevant measures (tinnitus handicap inventory (THI) and tinnitus questionnaire (TQ) scores, tinnitus duration and tinnitus intensity during the scanning session) and the connectivity pattern in the tinnitus population. We observed a significant positive correlation between the beta values of the posterior cingulate/precuneus region and the THI score. Our results show a modified functional connectivity pattern in tinnitus sufferers and highlight the role of the parahippocampal region in tinnitus physiopathology. They also point out the importance of the activity and connectivity pattern of the posterior cingulate cortex/precuneus region to the development of the tinnitus associated distress. This article is part of a Special Issue entitled: Tinnitus Neuroscience. [less ▲]

L'ADN du soi, allie du systeme immunitaire pour la fonction adjuvante de l'alun.

in Medecine Sciences : M/S (2012), 28(1), 31-3

Managers en quête de sens: l'identité organisationnelle comme boussole?

in Revue internationale de Psychosociologie et de Gestion des Comportements Organisationnels (2012), XVIII(46), 47-76

In a situation of crisis or deep organizational disruption, organizational identity often appears as a critical dimension (Albert et Whetten, 1985 ; Alvesson et Empson, 2008 ; Dutton et al, 1994). It ... [more ▼]

In a situation of crisis or deep organizational disruption, organizational identity often appears as a critical dimension (Albert et Whetten, 1985 ; Alvesson et Empson, 2008 ; Dutton et al, 1994). It cannot be considered as monolithic: each stage of the evolution of the organization is marked by several interactions (different identity logics predominate each other at times). Even if within an organizational identity, a particular identity logic seems to prevail, other identity logics are nevertheless present, or appear in informal mode. Organizational identity is thus conceived as hybrid : on the one hand, the dominant identity logic, on the other hand, alternative identity logics consisting in different perceptions of the organization’s central, enduring and distinctive features, its values and running principles. <br />Because of their formal authority and their access to resources, managers play an important role in organizational identification processes. They can first create meaning around a deliberate change (sensegiving). Such an approach emphasizes the role of organizational leaders (carriers of the dominant identity logic) in a cognitive process where they aim at providing to the members of the organization a coherent narrative in order to build a legitimate collective sense of self. As for the sensemaking-oriented approach (Weick, 1995), it adopts a different perspective: the shared understandings of the members about what the organization is, result of cognitive processes carried out by members of the organization when they are questioning the central, enduring and distinctive features of their organization. <br />We draw from the second perspective. Through a case study conducted in 2010 within a large company facing critical change, we propose to empirically illustrate the meaning given by members of the organization to different constitutive dimensions of organizational identity. We focus especially on team managers, at the crossroads of all tensions in terms of identity and meaning at work. <br />This case study illustrates in particular the disorientation of team managers, torn between a dominant organizational identity exploded from the top of the organization, and a radically changing organizational context, which they are struggling to make sense and to give sense for their team. It results in identity profiles marked by hybridity and transition. <br />When such a situation is noticed, what managerial actions can be undertaken? Our aim in this article is to highlight the value of a polyphonic approach of change management (Pichault, 2009), and offer some thoughts on the development of a sensemaking articulated to the diversity of identities within the organization as well as the integration of this identity diversity concerns in the management practices. [less ▲]

Lymphadénectomie para-aortique par laparoscopie assistée par robot dans le bilan des cancers du col utérin localement avancés. Étude belge multicentrique.

Poster (2012)

A modeling approach to determine the contribution of plant hydraulic conductivities on the water uptake dynamics in the soil-plant-atmosphere system

in Plant Growth Modeling, Simulation, Visualization and Applications (PMA), 2012 IEEE Fourth International Symposium on (2012)