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See detail"Le Fleuve" de Jean Renoir
Tomasovic, Dick ULiege

Conference given outside the academic context (2013)

Présentation du contexte de création et de production du film "Le Fleuve"

Detailed reference viewed: 29 (0 ULiège)
See detailFlexécurité et approche par les capacités : le cas de la formation professionnelle des demandeurs d'emploi
Orianne, Jean-François ULiege

Conference given outside the academic context (2011)

Detailed reference viewed: 60 (17 ULiège)
See detailLa flexibilité des sanctions en droit économique
Thirion, Nicolas ULiege

in Kaminski, Dan (Ed.) La flexibilité des sanctions. XXIes Journées Juridiques Jean Dabin (2012)

La flexibilité généralement requise de la norme juridique en matière économique déteint-elle sur le régime des sanctions applicables? C'est à cette question qu'est consacrée la contribution.

Detailed reference viewed: 113 (13 ULiège)
See detailFlexibilité du temps de travail: des stratégies différenciées pour les hommes et les femmes ?
Cornet, Annie ULiege

in De Nanteuil Miribel, M.; El Akremi, A. (Eds.) La société flexible (2005)

Detailed reference viewed: 71 (5 ULiège)
Peer Reviewed
See detailFlexibilité et représentation des travailleurs : un compromis (im)possible ?
Agro, Linda ULiege; Dieu, Anne-Marie ULiege; Schoenaers, Frédéric ULiege

in collectif (Ed.) Actes de la conférence IREC 1999 (1999)

Detailed reference viewed: 112 (67 ULiège)
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See detailFlexibility and Applicability of β-expectation tolerance interval approach to assess the fitness of purpose of pharmaceutical analytical methods
Bouabidi, Abderrahim; Talbi, M.; Bourichi, H. et al

in Drug Testing and Analysis (2012), 4(12), 1014-1027

An innovative versatile strategy using Total Error has been proposed to decide about the method’s validity that controls the risk of accepting an unsuitable assay together with the ability to predict the ... [more ▼]

An innovative versatile strategy using Total Error has been proposed to decide about the method’s validity that controls the risk of accepting an unsuitable assay together with the ability to predict the reliability of future results. This strategy is based on the simultaneous combination of systematic (bias) and random (imprecision) error of analytical methods. Using validation standards both types of error are combined through the use of a prediction interval or β-expectation tolerance interval. Finally, an accuracy profile is built by connecting, on one hand all the upper tolerance limits, and on the other hand all the lower tolerance limits. This profile combined with pre-specified acceptance limits allows to evaluate the validity of any quantitative analytical method and thus their fitness for their intended purpose. In this work, the approach of accuracy profile was evaluated on several types of analytical methods encountered in pharmaceutical industrial field and also covering different pharmaceutical matrices. The four studied examples depicted the flexibility and applicability of this approach for different matrices ranging from tablets to syrups, different techniques such as liquid chromatography, or UV spectrophotometry and for different categories of assays commonly encountered in the pharmaceutical industry that are content assays, dissolution assays and quantitative impurity assays. The accuracy profile approach assesses the fitness of purpose of these methods for their future routine application,. It also allows to select the most suitable calibration curve, to evaluate adequately a potential matrix effect and propose efficient solution and to define correctly the limits of quantification of the studied analytical procedures. [less ▲]

Detailed reference viewed: 145 (22 ULiège)
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See detailFlexibility and Security : What forms of Political Regulation ?
Nachi, Mohamed ULiege

in Transfer. European Review of Labour and Research (2004), 10(2), 300-318

The article examines the strengths and weaknesses of the concept of ‘flexicurity’, calling into question the tendency of the contemporary cultural imagination to regard flexibility as a framework for the ... [more ▼]

The article examines the strengths and weaknesses of the concept of ‘flexicurity’, calling into question the tendency of the contemporary cultural imagination to regard flexibility as a framework for the expression of individual freedom. It then describes a range of possible policy options, in relation to the market, in the perspective of combining flexibility of labour and security of persons. Tree major options emerge: the ‘procedural’, the ‘neo-substantive’ and the ‘partnership’ options. As a conclusion, this article comes out in favour of different policy which would alter the framework for public intervention. It specially underlines the need for a ‘flexible’ and ‘decentred’ Welfare State, capable of supporting and encompassing forms of regulation emanating from civil society, in particular – but not exclusively – from the social partners. [less ▲]

Detailed reference viewed: 55 (6 ULiège)
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See detailFlexibility services in the electrical system
Mathieu, Sébastien ULiege

Doctoral thesis (2016)

The work presented in this thesis considers the electrical flexibility from the electric load to its usage as a commodity. The conception of the European electrical system has led to a large amount of ... [more ▼]

The work presented in this thesis considers the electrical flexibility from the electric load to its usage as a commodity. The conception of the European electrical system has led to a large amount of actors that are impacted by flexibility exchanges. This thesis proposes approaches to assess the impact of exchanging flexibility in the electrical system and analyzes the complex interactions resulting from these exchanges. The modeling techniques used to carry the analysis are optimization, game theory and agent-based modeling. The impacts on different parts of the electrical system are presented: the day-ahead energy market, the secondary reserve and the distribution system. Since flexibility is the base block of this thesis, two methods to obtain flexibility from actual consumption processes are broached: direct control of the loads and dynamic pricing. One chapter provides an example of how flexibility can be obtained by the direct control of a portfolio of heat pumps and another chapter studies the control of electric heaters and boilers via the use of a simple price signal. [less ▲]

Detailed reference viewed: 209 (49 ULiège)
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See detailFlexibility services in the electrical system - presentation
Mathieu, Sébastien ULiege

Speech/Talk (2016)

This thesis assesses the impact of exchanging flexibility in the electrical system and analyzes the complex interactions that may result from these exchanges. The impacts on different parts of the ... [more ▼]

This thesis assesses the impact of exchanging flexibility in the electrical system and analyzes the complex interactions that may result from these exchanges. The impacts on different parts of the electrical system are presented: the day-ahead energy market, the secondary reserve and the distribution system. The modeling techniques used to carry the analysis are optimization, game theory and agent-based modeling. Since flexibility is the base block of this thesis, two methods to obtain flexibility from an actual consumption process are broached: direct control of a portfolio of heat pumps and dynamic pricing to control electric heaters and boilers. [less ▲]

Detailed reference viewed: 426 (22 ULiège)
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Peer Reviewed
See detailFlexible aggregative behavior of Harmonia axyridis according to the freshness of area marking in overwintering sites
Durieux, Delphine ULiege; Fischer, Christophe ULiege; Fassotte, Bérénice ULiege et al

Poster (2012, July)

The multicolored Asian ladybeetle, Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae), aggregates inside dwellings and buildings during winter to survive cold. This adaptive behavior causes annoyances ... [more ▼]

The multicolored Asian ladybeetle, Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae), aggregates inside dwellings and buildings during winter to survive cold. This adaptive behavior causes annoyances to the occupants because of their large number and the induction of allergic reactions. Although this species has aroused a great interest these last years, the factors involved in the selection of its overwintering sites remain misunderstood. The work presented herein was oriented to the study of the non-volatile chemical compounds involved in this aggregation behavior. Chemical analyses revealed the occurrence, in aggregation sites, of an area marking made up of saturated and unsaturated hydrocarbons. Behavioral investigations demonstrated that H. axyridis preferentially aggregates in sites previously marked by congeners, indicating the retention potential of this blend on overwintering individuals. In the second instance, the same analyses were performed on an area marking aged of one year. The chemical investigations showed that only saturated hydrocarbons can still be detected after that period of time but the remaining blend does not induce aggregation anymore. This difference of response according to the freshness of the area marking suggests that this species would not be prisoner of the marking previously deposited on the substrate if the surrounding has changed and the site is not suitable anymore. [less ▲]

Detailed reference viewed: 35 (10 ULiège)
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See detailFlexible Bayesian Models for Interval-Censored Survival Data
Cetinyürek, Aysun ULiege

Doctoral thesis (2017)

Interval-censored time-to-event data arise frequently in clinical trials and longitudinal studies, where the event of interest is only known to have occurred between the two consecutive visits. Interval ... [more ▼]

Interval-censored time-to-event data arise frequently in clinical trials and longitudinal studies, where the event of interest is only known to have occurred between the two consecutive visits. Interval-censoring is a natural generalization of right censored time-to-event data. For right-censored data, extensive number of statistical techniques are available to tackle most research questions under a variety of assumptions. However, for interval-censored data, less well developed procedures are available. A sparse offer in statistical softwares to handle this type of censoring has driven many researchers to use imputation techniques, especially right-point or mid-point imputation. However such imputation strategies can lead to misleading inferences. Our thesis proposes and studies the properties of innovative methods to analyze such data. In the first part of the text, we have extended a Bayesian density estimation procedure for grouped data to estimate hazard ratios and survival functions from interval-censored data. If one further assumes proportionality of the hazards, the proposed strategy also provides estimates of global covariate effects. Clearly, the proposed method provides very good estimates for the regression coefficients and successfully approximates the baseline survival function when the mean interval width is smaller than some threshold defined from the data standard deviation. In a Cox proportional hazards model, the observations are assumed to be independent. However, this may not be true in certain situations where the observed units are clustered or subject to multiple measurements. A number of approaches generalizing Cox's PH model to handle correlated interval-censored data have been proposed in the literature. The shared frailty model is a popular tool to analyze correlated right-censored time-to-event data. Frailty models have also been adapted to handle interval-censored data. In the case of interval-censored time-to-event data, the inclusion of frailties results in complicated intractable likelihoods. In the second part of this thesis, we propose flexible frailty models for analyzing such data by assuming a smooth flexible form for the conditional time-to-event distribution and a parametric or a flexible form for the frailty distribution. It has been indicated in the literature in different contexts that the misspecification of the random effect distribution can influence the estimation of quantities of primary interest, like the fixed effects. To circumvent such misspecification, we have suggested modeling the distribution of the frailty in a flexible way using P-splines or a gamma shape mixture (GSM) distribution. The biggest advantage of using a flexible specification for the density of frailty arises when its shape is of specific interest. If it is considered as a nuisance, assuming a simpler lognormal or gamma frailty would be an adequate solution to draw conclusions related to other model parameters, such as regression coefficients and variance of frailties. Indeed, it was shown in the simulation study that the regression parameter estimates in a shared frailty PH model are robust to the misspecification of the frailty density. Moreover the use of a flexible form for the frailty does not cause any loss of precision in the estimation of regression parameters when compared to the simpler parametric frailty model. Both models provide the possibility to visualize the baseline density and survival functions. Given sufficiently large sample sizes, the flexible approach produces smooth and accurate posterior estimates for the baseline survival function and for the frailty density, and can correctly detect and identify unusual frailty density forms. [less ▲]

Detailed reference viewed: 99 (7 ULiège)
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See detailFlexible estimation in cure survival models using Bayesian P-splines
Bremhorst, Vincent; Lambert, Philippe ULiege

in Computational Statistics & Data Analysis (2016), 93

In the analysis of survival data, it is usually assumed that any unit will experience the event of interest if it is observed for a sufficiently long time. However, it can be explicitly assumed that an ... [more ▼]

In the analysis of survival data, it is usually assumed that any unit will experience the event of interest if it is observed for a sufficiently long time. However, it can be explicitly assumed that an unknown proportion of the population under study will never experience the monitored event. The promotion time model, which has a biological motivation, is one of the survival models taking this feature into account. The promotion time model assumes that the failure time of each subject is generated by the minimum of N independent latent event times with a common distribution independent of N. An extension which allows the covariates to influence simultane- ously the probability of being cured and the latent distribution is presented. The latent distribution is estimated using a flexible Cox proportional hazard model where the logarithm of the baseline hazard function is specified using Bayesian P-splines. Introducing covariates in the latent distribution implies that the population hazard function might not have a proportional hazard structure. However, the use of P- splines provides a smooth estimation of the population hazard ratio over time. The identification issues of the model are discussed and a restricted use of the model when the follow up of the study is not sufficiently long is proposed. The accuracy of our methodology is evaluated through a simulation study and the model is illustrated on data from a Melanoma clinical trial. [less ▲]

Detailed reference viewed: 55 (9 ULiège)
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See detailFlexible mechatronic systems: Time integration and sensitivity analysis
Bruls, Olivier ULiege

Scientific conference (2006, July)

Detailed reference viewed: 20 (0 ULiège)
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See detailFlexible multibody system modelling: A geometric local frame approach on SE(3)
Sonneville, Valentin ULiege

Scientific conference (2015, October 30)

In order to improve computational costs in the frame of flexible multibody system modelling, we propose a geometrically exact framework relying on a local frame description. Thanks to this framework ... [more ▼]

In order to improve computational costs in the frame of flexible multibody system modelling, we propose a geometrically exact framework relying on a local frame description. Thanks to this framework, geometric non-linearities are strongly reduced for two reasons. Firstly, the equations of motion can be solved without introducing a global parametrization of the motion, which also leads to a naturally singularity-free description of large rotations. Secondly, the equations of motion are expressed in a local frame, both at position and rotation level, leading to intrinsic equations. Accordingly, these equations are insensitive to large amplitude motions, such that the geometric non-linearities are naturally filtered. The mathematical developments are carried out in a Lie group setting which, albeit more abstract than classical treatments, provides generic and powerful well established tools. So far, several elements have been formulated in this framework: rigid body, kinematic joints and a flexible beam finite element. A shell finite element and a super-element are also under development. Some interesting numerical advantages are observed following the reduction of geometric non-linearities, e.g., the iteration matrix depends on relative motion within the elements only and is thus invariant under rigid body motions. [less ▲]

Detailed reference viewed: 126 (18 ULiège)