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See detailContract 21539/08/NL/SFe - Advancement of mechanical verification methods for non-linear spacecraft: Exploitation of test data
Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg

Report (2011)

The objective of this technical note is to apply the nonlinear system identification techniques described in the technical note "Nonlinearity identification methods: predictive analyses" to the ... [more ▼]

The objective of this technical note is to apply the nonlinear system identification techniques described in the technical note "Nonlinearity identification methods: predictive analyses" to the experimental data gathered on the SmallSat spacecraft structure. Guidelines for nonlinear spacecraft testing and identification are also be provided. [less ▲]

Detailed reference viewed: 14 (4 ULg)
See detailContract 21539/08/NL/SFe - Advancement of mechanical verification methods for non-linear spacecraft: Modal analysis using nonlinear normal modes.
Renson, Ludovic ULg; Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg

Report (2012)

The objective of this technical note is to explore the applicability of nonlinear modal analysis to spacecraft structures. To this end, algorithms for the continuation of periodic solutions are applied to ... [more ▼]

The objective of this technical note is to explore the applicability of nonlinear modal analysis to spacecraft structures. To this end, algorithms for the continuation of periodic solutions are applied to the finite element model of the SmallSat spacecraft. Nonlinear normal modes and their corresponding frequencies of oscillation are computed, and the results are discussed. [less ▲]

Detailed reference viewed: 37 (3 ULg)
See detailContract 21539/08/NL/SFe - Advancement of mechanical verification methods for non-linear spacecraft: Nonlinear identification using a subspace-based method in the frequency domain
Noël, Jean-Philippe ULg; Renson, Ludovic ULg; Kerschen, Gaëtan ULg

Report (2012)

The objective of this technical note is to explore the applicability of a newly introduced nonlinear system identification technique to spacecraft structures. To this end, numerical experiments are ... [more ▼]

The objective of this technical note is to explore the applicability of a newly introduced nonlinear system identification technique to spacecraft structures. To this end, numerical experiments are conducted using a finite element model of the SmallSat spacecraft. A detailed introduction to the method, referred to as the frequency-domain nonlinear subspace identification (FNSI) method, is provided and its major assets are commented. Random-type and sine-sweep excitations are considered and identification results are extensively discussed. [less ▲]

Detailed reference viewed: 41 (2 ULg)
See detailContract 21539/08/NL/SFe - Advancement of mechanical verification methods for non-linear spacecraft: Nonlinearity identification methods: predictive analyses
Kerschen, Gaëtan ULg; Noël, Jean-Philippe ULg

Report (2010)

The objective of this technical note is to explore the applicability of nonlinear system identification techniques to spacecraft structures. To this end, numerical experiments carried out using the finite ... [more ▼]

The objective of this technical note is to explore the applicability of nonlinear system identification techniques to spacecraft structures. To this end, numerical experiments carried out using the finite element model of the SmallSat spacecraft are used, without, however, having access to the model itself. The constraints imposed by the considered techniques for breadboard testing are also highlighted. [less ▲]

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See detailContract Renewal as an Incentive Device. An Application to the French Urban Public Transport Sector
Gautier, Axel ULg; Yvrande-Billon, Anne

in Review of Economics and Institutions (2013), 4(Winter), 2

In the French urban public transport industry, operations are often delegated and periodically put out for tender. Thus, operators’ incentives to reduce costs come from both profit maximization during the ... [more ▼]

In the French urban public transport industry, operations are often delegated and periodically put out for tender. Thus, operators’ incentives to reduce costs come from both profit maximization during the current contract and from the perspective of contract renewal. We construct a dynamic incentive regulation model that captures these features and we show that both the level of cost-reducing effort and its repartition during the contracting period depend on the contract type (cost-plus, gross cost or net cost contract). We then estimate a cost frontier model for an eight-year panel of French bus companies (664 company-year observations) to test our predictions. [less ▲]

Detailed reference viewed: 120 (13 ULg)
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See detailContract renewal as an incentive device: An application to the French urban transport sector
Gautier, Axel ULg

Conference (2010, July)

In the French urban public transport industry, operations are often delegated and periodically putted out forto tender. Thus, operators’ incentives to reduce costs come from both profit maximization ... [more ▼]

In the French urban public transport industry, operations are often delegated and periodically putted out forto tender. Thus, operators’ incentives to reduce costs come from both profit maximization during the current contract and from the perspective of contract renewal. We have constructed a dynamic incentive regulation model that captures these features and we show that both the level of cost-reducing effort and its repartition during the contracting period depend on the contract type (cost-plus, gross cost or net cost contract). We then estimated a cost frontier model for an eight-year panel of French bus companies (677 company-year observations) to test our predictions. [less ▲]

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See detailContractile and electrophysiological properties of pulmonary artery smooth muscle are not altered in TASK-1 knockout mice.
Manoury, B.; Lamalle, Caroline ULg; Oliveira, R. et al

in Journal of Physiology (2011), 589(13), 3231-3246

The acid-sensitive, two-pore domain K(+) channel, TASK-1, contributes to the background K(+) conductance and membrane potential (Em) of rat and human pulmonary artery (PA) smooth muscle cells (SMC), but ... [more ▼]

The acid-sensitive, two-pore domain K(+) channel, TASK-1, contributes to the background K(+) conductance and membrane potential (Em) of rat and human pulmonary artery (PA) smooth muscle cells (SMC), but its role in regulating tone remains elusive. This study aimed to clarify the role of TASK-1 by determining the functional properties of PA from mice in which the TASK-1 gene was deleted (TASK-1/3 KO), in comparison with wild type (WT) C57BL/6 controls. Small vessel wire myography was used to measure isometric tension developed by intact PA. Em and currents were recorded from freshly isolated PASMC using the perforated patch-clamp technique. Reverse-transcription polymerase chain reaction (RT-PCR) was used to estimate K(+) channel expression. We could find no difference between PA from WT and TASK-1/3 KO TASK KO mice. They showed similar constrictor responses to a range of agonists and K(+) concentrations, the K(+) channel blockers 4-aminopyridine, tetraethylammonuim ions and XE991. Treprostinil, proposed to dilate by activating TASK-1, was just as effective in TASK-1/3 KO arteries. Blocking Ca(2+) influx with nifedipine (1 muM) or levcromakalim (10 muM) had no effect on resting tone in either strain. The resting Em of PASMC and its responses to K(+) channel blockers were unchanged in TASK-1/3 KO mice as were voltage-activated K(+) currents, including the non-inactivating K(+) current (I(KN)) measured at 0 mV. The Em was, however, depolarised in comparison with other species. Mouse I(KN) was much smaller than in rat and showed no sensitivity to pH. The results imply that TASK-1 does not form a functional channel in mouse PASMC. [less ▲]

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See detailContractile reserve assessed using dobutamine echocardiography predicts left ventricular reverse remodeling after cardiac resynchronization therapy: prospective validation in patients with left ventricular dyssynchrony.
Sénéchal, Mario; Lancellotti, Patrizio ULg; Magne, Julien ULg et al

in Echocardiography (2010), 27(6), 668-76

Background: The presence of viable myocardium may predict response to cardiac resynchronization therapy (CRT). The aim of this study is to evaluate in patients with left ventricular (LV) dyssynchrony ... [more ▼]

Background: The presence of viable myocardium may predict response to cardiac resynchronization therapy (CRT). The aim of this study is to evaluate in patients with left ventricular (LV) dyssynchrony whether response to CRT is related to myocardial viability in the region of the pacing lead. Methods: Forty-nine consecutive patients with advanced heart failure, LV ejection fraction < 35%, QRS duration > 120 ms and intraventricular asynchronism ≥ 50 ms were included. Dobutamine stress echocardiography was performed within the week before CRT implantation. Resting echocardiography was performed 6 months after CRT implantation. Viability in the region of LV pacing lead was defined as the presence of viability in two contiguous segments. Response to CRT was defined by evidence of reverse LV remodeling (≥15% reduction in LV end-systolic volume). Results: Thirty-one patients (63%) were identified as responders at follow-up. The average of viable segments was 5.9 ± 2 in responders and 3.2 ± 3 in nonresponders (P = 0.0003). Viability in the region of the pacing lead had a sensitivity of 94%, a specificity of 67%, a positive predictive value of 83%, and a negative predictive value of 86% for the prediction of response to CRT. Conclusions: In patients with LV dyssynchrony, reverse remodeling after CRT requires viability in the region of the pacing lead. This simple method using echocardiography dobutamine for the evaluation of local viability (i.e., viability in two contiguous segments) may be useful to the clinician in choosing the best LV lead positioning. [less ▲]

Detailed reference viewed: 23 (1 ULg)
See detailContracting in manufacturing networks with inventories
Arda, Yasemin ULg; Hennet, Jean-Claude

Conference (2006, April 18)

An important issue in the management of supply chains and manufacturing systems is to achieve the desired customer service level while respecting the individual economic objectives of the partners. These ... [more ▼]

An important issue in the management of supply chains and manufacturing systems is to achieve the desired customer service level while respecting the individual economic objectives of the partners. These objectives are generally antagonistic and can lead to contradictory choices in the context of a network with a high degree of local decisional autonomy. The challenge involved is to determine a coordination mechanism that avoids global loss of economic efficiency and to solve nonlinear optimization problems that capture the key dynamics of a complex production/inventory system. This study investigates a two-stage serial supply chain with one manufacturer and one supplier. The manufacturer, producing goods to serve a Poisson demand process, procures a key component from his supplier. At each production facility, the successive processing times of the units are independent exponential random variables. In the decentralized setting considered, each firm manages the local production/inventory control system while attempting to maximize his own steady state expected profit. The main operational decision at each stage is the level of the inventory control parameter. In the game theory framework, the partners play a two-stage game of the Stackelberg type. The manufacturer leads the game by setting the component purchasing price as a function of the observed lateness of delivery. In the considered make-to-stock queuing system, the production facility of the supplier behaves as an M/M/1 queue. However, the departure of units from the finished-goods inventory of the supplier is not a Poisson process. In order to derive closed form results, the method of Lee and Zipkin (1992) is used to approximate the limiting probabilities of the second stage production process. The supplier’s profit function is concave and the optimal action of the supplier can be correctly anticipated by the manufacturer. The manufacturer’s constrained optimization problem consists of determining the optimal values of the contract parameters and the second stage base-stock level. It is shown that using the defined contracting scheme, the system optimal solution is obtained as the Stackelberg equilibrium. [less ▲]

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See detailContraction of monotone phase-coupled oscillators
Mauroy, Alexandre ULg; Sepulchre, Rodolphe ULg

in Systems & Control Letters (2012), 61(11), 1097-1102

This paper establishes a global contraction property for networks of phase-coupled oscillators characterized by a monotone coupling function. The contraction measure is a total variation distance. The ... [more ▼]

This paper establishes a global contraction property for networks of phase-coupled oscillators characterized by a monotone coupling function. The contraction measure is a total variation distance. The contraction property determines the asymptotic behavior of the network, which is either finite-time synchronization or asymptotic convergence to a splay state. © 2012 Elsevier B.V. All rights reserved. [less ▲]

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See detailContractuele aansprakelijkheid in het bouwrecht. Rechtspraakoverzicht 1999-2009
Kohl, Benoît ULg; Hoebeeck, Maarten

in Tijdschrift voor Bouwrecht en Onroerend Goed (2010), (3), 124-137

Examen de la jurisprudence récente relative à la responsabilité contractuelle en droit de la construction.

Detailed reference viewed: 71 (1 ULg)
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See detailLa contradiction des motifs : réflexions à partir du droit belge
Henry, Frédéric ULg; Caprasse, Olivier ULg

in Revue de l'Arbitrage (2011)

La contradiction des motifs d'une sentence arbitrale ne devrait pas être assimilée à l'absence de ses motifs et ne pas conduire à l'annulation de la sentence

Detailed reference viewed: 107 (3 ULg)
See detailLes contradictions de la violence légitime
Verjans, Pierre ULg

in Beaufays, Jean (Ed.) La démocratie après le 11 septembre (2003)

Detailed reference viewed: 17 (2 ULg)
See detailContrainte, limitation et atteinte à la propriété
Lecocq, Pascale ULg; Lewalle, Paul ULg

Book published by De Boeck & Larcier (2005)

Detailed reference viewed: 36 (2 ULg)
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See detailLes contraintes à la valorisation écotouristique du Parc National des ïles Ehotilé (Littoral sud est de la Côte d'Ivoire)
Kouakou, Guy Eric Anicet Quassy ULg

Doctoral thesis (2013)

Under the pressure of the environmental financiers and within the framework of the reform of its conservation policy of the protected areas, the Côte d’Ivoire State decided to preserve, to valorize spaces ... [more ▼]

Under the pressure of the environmental financiers and within the framework of the reform of its conservation policy of the protected areas, the Côte d’Ivoire State decided to preserve, to valorize spaces protected by the ecotourist approach. The first field of experiment of this approach was the National Park of Islands Ehotilé. But decade after the implementation of this policy, this initiative has difficulty in being set up. The question is to know what are the determining factors of failure of the process of ecotourist exploitation in the PNIE? To answer this question, this research, approached according to a multidisciplinary approach, suggests studying the progress of two experiences of ecotourism in the PNIE (A project introduced by the WWF and financed by the English cooperation, and an other, set up by a local NGO financed by the Global Environment Facility), to identify and analyze the factors of inhibition of the ecotourist process in this park. Analyses (quantitative and qualitative) were made from the data collected in ten waterside villages of the PNIE, through structured or semi-structured interview. These conversations also concerned the state departments (in charge of the preservation and of the tourism), the local authorities, the local administrators, the initiators of projects. We also proceeded to the consultation of several sources of documentation. The obtained results show that the material, legal and institutional conditions were not performed at the time of the political decision-making of implementation of the approach of preservation by the ecotourism. In a general way, the hotel, road infrastructures, the socio-sanitary equipments inside and outside are of inferior quality even non-existent. The tourist development (no observation, runways, landing stage) inside the park has been lacking. It was revealed also no promotional support (advertising, web site, etc.) exists to sell the PNIE. At the legal and institutional level, the legal and institutional requirements are on straddle between those mobilized by the actors of the tourism and those used by the actors of the preservation without synergy between these two groups of participants. The results also allowed to highlight the existence of a multitude of participants in interaction in and the periphery of the PNIE, characterized by differences of interests and logics of action as much at the level of the priorities of actions as means of carrying out the ecotourist exploitation of the PNIE. What was lacking in the attempt of putting in ecotourism of this park, it is the capacity to make compatible these differences of interests and logics of action, and the possibility of coordinating them. Our study also revealed differences of vision and representations towards the resources of the PNIE in the attempt of putting in ecotourism of this park. These differences concern the ancestral dimension, as well as the use values of this protected space. These conflicts are indicator of an elaboration and an inadequate management of the mechanism of ecotourist production in connection with the non-inclusion of the diverse social representations mobilized by the various actors of the projects. Besides, the convergences of representations mentioned with the actors concern "myths". The myth of the “ancestralité” bases itself on the ancestral link of the local residents with the islands of the park and appears for the promoters of the projects of ecotourist development as the element which has to justify the membership of the local populations. There is also a mythical version of the natural potentialities of the park which bases itself on the presence of exceptional species that " we do not find somewhere else ". The myth of the tourism as the vector of protection and development was also indicated. The problem is that, in the process of ecotourist valuation, the participants do not question any more these mythical versions mobilized around the PNIE. The latter appear for these participants as an obvious fact; not arousing question, they are not really worked to become resources. Finally, the results showed that the attempt of development of the ecotourism in the PNIE is marked by a governance, - in terms of piloting of the projects -, characterized by a series of uninsured coordinations or which are failing. The ecotourist projects tended to push aside or to make a weak place to the actors responsible for the park, to the actors of the territorial administration and to the actors of the tourism. In political terms, it was missing a space of coordination and piloting of this coordination. After all, recommendations are made to revitalize and strengthen the conditions of implementation and management of experiences of ecotourism in the PNIE and generally in the parks of Côte d’Ivoire. These recommendations would aim at improving the questions connected to the organizational, regulatory aspects and of planning. [less ▲]

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See detailLes contraintes à la valorisation écotouristique du Parc National des ïles Ehotilé (Littoral sud est de la Côte d'Ivoire)
Kouakou, Guy Eric Anicet Quassy ULg

in Bilan Colloque sur la Coopération internationale pour un tourisme responsable et une valorisation touristique des territoires. Université de Versailles Saint-Quentin-en-Yvelines (2010)

Detailed reference viewed: 27 (2 ULg)
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See detailContraintes budgétaires et avenir de l'Université
Betz, Emile-Hippolyte ULg

Speech/Talk (1981)

Detailed reference viewed: 18 (8 ULg)
See detailContraintes de situation et interactions maître-élève: Changer sa façon d'enseigner, est-ce possible ?
Crahay, Marcel ULg

in Revue Française de Pédagogie (1988), 88

Detailed reference viewed: 114 (10 ULg)