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See detailPredicting Grain Protein Content of Winter Wheat
Mansouri, Majdi ULg; Dumont, Benjamin ULg; Destain, Marie-France ULg

in ESANN 2014 Proceedings (2014, April 24)

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See detailMachine learning techniques to assess the performance of a gait analysis system
Pierard, Sébastien ULg; Phan-Ba, Rémy; Van Droogenbroeck, Marc ULg

in European Symposium on Artificial Neural Networks, Computational Intelligence and Machine Learning (ESANN) (2014, April 24)

This paper presents a methodology based on machine learning techniques to assess the performance of a system measuring the trajectories of the lower limbs extremities for the follow-up of patients with ... [more ▼]

This paper presents a methodology based on machine learning techniques to assess the performance of a system measuring the trajectories of the lower limbs extremities for the follow-up of patients with multiple sclerosis. We show how we have established, with the help of machine learning, four important properties about this system: (1) an automated analysis of gait characteristics provides an improved analysis with respect to that of a human expert, (2) after learning, the gait characteristics provided by this system are valuable compared to measures taken by stopwatches, as used in the standardized tests, (3) the motion of the lower limbs extremities contains a lot of useful information about the gait, even if it is only a small part of the body motion, (4) a measurement system combined with a machine learning tool is sensitive to intra-subject modifications of the walking pattern. [less ▲]

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See detailLogistics hub: the case of Liège
Limbourg, Sabine ULg; Mostert, Martine ULg; Paquay, Célia ULg

Conference (2014, April 24)

A logistics hub can be defined as a specific area where all the activities relating to transport, logistics and goods distribution are carried out. With its central location in Europe, highly developed ... [more ▼]

A logistics hub can be defined as a specific area where all the activities relating to transport, logistics and goods distribution are carried out. With its central location in Europe, highly developed infrastructures, airport and inland terminals, the region of Liège claims to be a logistics hub. This paper applies a strategic decision model based on seven relevant criteria (infrastructure, proximity to market, land availability, government and industry support, labour supply, origin/destination distances and congestion) to assess the efficiency of the logistics hub of the region of Liège. Two SWOT analyses are performed in parallel to evaluate the positions of Liège Airport and of the inland freight hub, Trilogiport, in relation to their own performances and the competition. The two main development factors of inland freight hubs are considered: the possibility of modal shift from road transport to more environmentally friendly transportation modes and the avoidance of the congestion of the two seaport areas of Antwerp and Rotterdam. This article concludes by highlighting that the bid of the region of Liège and its characteristics should contribute to a more efficient intermodal transport in Europe, helping to boost the distribution of products, and at the same time, encourage the reduction of greenhouse gas emissions. However, the development of Liège as an inland freight hub depends on its ability to generate a critical mass, notably thanks to the local businesses, in order to realise economies of scale. [less ▲]

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See detailLes préférences alimentaires : comment préserver son équilibre alimentaire et sa qualité de vie? De l'enfant à l'adulte.
Etienne, Anne-Marie ULg

Scientific conference (2014, April 24)

Dans notre société actuelle, nous observons un engouement pour les émissions culinaires : Master Chef, Top Chef, un dîner presque parfait, … En même temps, plusieurs études montrent que de nombreuses ... [more ▼]

Dans notre société actuelle, nous observons un engouement pour les émissions culinaires : Master Chef, Top Chef, un dîner presque parfait, … En même temps, plusieurs études montrent que de nombreuses personnes ne mangent pas selon les recommandations actuelles. D’où un intérêt grandissant pour la compréhension des mécanismes liés aux préférences alimentaires : Que se passe-t-il quand un enfant a le choix entre plusieurs aliments ? Comment ces préférences alimentaires évoluent-elles à l’âge adulte ? Les mécanismes d’apprentissage social fournissent des réponses quant aux choix concernant la nourriture ; ceci comprend en particulier les parents et les médias qui véhiculent de l’information ou présentent de nouveaux modèles. Partant de là, nous discuterons de comment concilier nos préférences alimentaires avec un équilibre alimentaire, sans basculer dans une restriction alimentaire qui elle, risque d’affecter notre qualité de vie. [less ▲]

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See detailA Frequency-domain Approach to Subspace Identification of Nonlinear Systems, Application to Aerospace Structures
Noël, Jean-Philippe ULg

Doctoral thesis (2014)

The construction of mathematical models from experimental data is an essential step in the design process of engineering systems. The different tasks involved in this activity, from the measurement and ... [more ▼]

The construction of mathematical models from experimental data is an essential step in the design process of engineering systems. The different tasks involved in this activity, from the measurement and processing of data to the validation of the model, fall into the general field of system identification. In structural dynamics, the theoretical and experimental aspects of linear system identification have been successfully addressed since the early seventies, and mature analytical, computational and testing tools have emerged. Nonlinear system identification of vibrating structures has also enjoyed significant advances during the past few years. However, the common practice in industry is to ignore nonlinearities, arguably because their analysis is still regarded as impractical. The objective of this doctoral thesis is precisely to progress towards the development of a practical system identification methodology dedicated to real-life nonlinear structures. The first facet of the thesis is to introduce a nonlinear generalisation in the frequency domain of the so-called subspace identification methods. The proposed frequency-domain nonlinear subspace identification (FNSI) approach yields accurate models of large-scale systems comprising strong nonlinearities, closely-spaced modes and high damping. Because it can also estimate a large number of parameters while maintaining an acceptable computational burden, the second facet of this research is to investigate the utilisation of cubic splines as a very flexible means to model complex nonlinearities. Finally, the third facet of the present work is to derive nonlinear models with optimal statistical properties in the presence of measurement noise. This is achieved by embedding the FNSI method into the maximum likelihood identification framework. The scope of the identification and modelling tools developed in this thesis encompasses nonlinear structural systems originating from the various areas of vibration engineering, including the aerospace, mechanical or civil fields, amongst others. Throughout the dissertation, these tools are illustrated using numerical and experimental structures of increasing complexity, mainly related to aerospace applications. [less ▲]

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See detailCirculating microRNAs as diagnostic markers in breast cancer patients and their deregulation under neoadjuvant chemotherapy
FRERES, Pierre ULg

Poster (2014, April 24)

Breast cancer is the leading cause of death by cancer among women and there is an urgent need to improve its diagnosis and prognosis. MicroRNAs (miRNAs) are non-coding RNAs that regulate gene expression ... [more ▼]

Breast cancer is the leading cause of death by cancer among women and there is an urgent need to improve its diagnosis and prognosis. MicroRNAs (miRNAs) are non-coding RNAs that regulate gene expression and many have been implicated in breast cancer. In this article, we focus on circulating miRNAs as biomarkers for breast cancers and we describe the deregulation of their expression during neoadjuvant chemotherapy (NAC). [less ▲]

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See detailStochastic exposure to sub-lethal high temperature enhances exopolysaccharides (EPS) excretion and improves Bifidobacterium bifidum cell survival to freeze-drying
Nguyen, Huu Thanh ULg; Razafindralambo, Hary; Blecker, Christophe ULg et al

in Biochemical Engineering Journal (2014), 88

Exposure of microbial cells to sub-lethal stresses is known to increase cell robustness. In this work, a two-compartment bioreactor in which microbial cells are stochastically exposed to sub-lethal ... [more ▼]

Exposure of microbial cells to sub-lethal stresses is known to increase cell robustness. In this work, a two-compartment bioreactor in which microbial cells are stochastically exposed to sub-lethal temperature stresses has been used in order to investigate the response of the stress sensitive Bifidobacterium bifidum THT 0101 to downstream processing operations. A stochastic model validated by residence time distribution experiments has shown that in the heat-shock configuration, a two-compartment bioreactor (TCB) allows the exposure of microbial cells to sub-lethal temperature of 42°C for a duration comprised between 100 and 300 seconds. This exposure resulted in a significant increase of cell resistance to freeze-drying by comparison with cells cultivated in conventional bioreactors or in the TCB in the cold shock mode (CS-TCB). The mechanism behind this robustness seems to be related with the coating of microbial cells with exopolysaccharide (EPS), as assessed by the change of the zeta potential and the presence of higher EPS concentration after heat shock. Conditioning of Bifidobacteria on the basis of the heat shock technique is interesting from the practical and economical point of view since this strategy can be directly implemented in the bioreactor during stationary phase preceding cell recovery and freeze-drying [less ▲]

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See detailLe rôle du commerce frontalier des produits alimentaires avec le Rwanda dans l'approvisionnement des ménages de la ville de Bukavu (Province du Sud-Kivu)
Vwima Ngezirabona, Stany ULg

Doctoral thesis (2014)

This thesis aims at highlighting the importance of food supply from the Rusizi District (Rwanda) in the food security of the city Bukavu (Democratic Republic of Congo). Due to the informal nature of this ... [more ▼]

This thesis aims at highlighting the importance of food supply from the Rusizi District (Rwanda) in the food security of the city Bukavu (Democratic Republic of Congo). Due to the informal nature of this supply, it was necessary to characterize its magnitude, drivers, and consequences as well as to develop policies that are likely to improve this supply and facilitate regional integration. The fieldwork consisted of two series of investigations. The first series of data collection included scoring the flow of food supply from Rusizi District during three months and for each of the food supply axes of Bukavu city. Secondly, a questionnaire was administered to a sample of 233 households, wherein 76 consuming households and 157 reselling households. Results from the scoring exercise show that 2,021 households on average cross both borders (Rusizi 1 and Ruzizi 2) for their food supply daily. A total of 661 of these households (about 32.7%) are direct food consumers and 1,360 households (about 67.3%) are food resellers. Excepted for cassava (which is a traditional staple of South Kivu), plantains (because of conservation problem, much more coming from within the province), and beans (much more from North Kivu), other major food products are imported from Ruzizi district in Rwanda. In this regard, the dependency ratios towards Rwanda remain much higher for products such as maize (66%), potatoes (82%), sorghum (73%), groundnut (69%), sweet potato (98%), rice (70%), and beef and pork meat (85%). With such dependency ratios, Bukavu is a major food market of the Rusizi District (Rwanda) food products. This is however far from being confirmed by official import statistics of the Congolese Control Office (CC0) which, except for rice, underestimates the border trade for a large portion of food commodities flows. The commodities analyzed provide the population of the city of Bukavu 1027 kcal per person per day from which 593.5 kcal, 338.9 kcal and 92.4 kcal are provided by products respectively from Rwanda, North-Kivu and South-Kivu. The calories consumed in the city of Bukavu are mainly of vegetable origin dominated by maize (563.1 kcal), cassava (120 kcal) and beans (167.1 kcal), which play a strategic role given their importance in the food habits of Bukavu. The significant flows of food supplies from Rusizi district are a major contribution to the livelihood of thousands of families in the city of Bukavu. It emerges that all products supplied from Rusizi district by reselling households generate positive return per month demonstrating a positive remuneration not only for the invested capital, but also for the time and effort invested in the activity (average 5.67 hours). More than 68 % of reselling households claim are satisfied with the result of this activity and allocate the generated income mainly to cover subsistence needs. In this sense, the economic impact of border trade on incomes of reselling households is a reality. The analysis of budgets of consuming households shows that 69.1% of food expenditure and 48.8% of total expenditure of consuming households cross the border. The significant impact of food supplies from the Rusizi district on reducing households’ income poverty, reflects the interests of border trade which only reinforces the structural and relative decline of the agricultural sector in South Kivu already confronted to various problems. The free trade policy advocated by a large number of sub-regional and regional communities such as CEPGL and COMESA will make the Rusizi originating food supply of Bukavu more efficient, but it remains a short-term solution of food security of the city and the province in general. In the long term, it would be better to stimulate the production and promote local food trade. To achieve this, investments need to be channeled to the agricultural sector. It is at this price that the agricultural sector in South-Kivu can be revived and reach the threshold of self-sufficiency, and even create a surplus for export. Admittedly, this solution then poses the problem of reconversion of consuming households and sellers-households that we should rethink from the outset. [less ▲]

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See detailEnforcement of accounting standards, financial crisis, and their impact on impairment of non financial assets
Yammine, Mira ULg; Olivier, Henri ULg

Conference (2014, April 24)

The consistent application of IFRS is a concern for the different users of financial statements. In this context this study aims to investigate the impact exercised by the enforcement of accounting ... [more ▼]

The consistent application of IFRS is a concern for the different users of financial statements. In this context this study aims to investigate the impact exercised by the enforcement of accounting standards and the financial crisis on the consistent application of IAS 36 `impairment of assets¿. Listed companies from17 European countries applying IFRS are selected. Two groups of countries are selected based on government indicators namely rule of law, control of corruption, regulatory quality, and government effectiveness. Enforcement of accounting standards is determined from a survey addressed to the institutional oversights bodies that supervise and enforce accounting standards applications in each country. We find that the enforcement of accounting standards has decreased the impairment of assets registrations. But this observation appears to be true only in high government indicators countries. In these same countries the financial crisis has a positive impact on the impairment of assets magnitude. [less ▲]

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See detailEnjeux autour des forêts congolaises. Conflits d’usage, conflits sans arbitres
Vermeulen, Cédric ULg

Conference given outside the academic context (2014)

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See detailStudies of the Domains II and III of Bacillus subtilis PBP4a in relation with the protein localization
Vanden Broeck, Arnaud ULg; Van Der Heiden, Edwige ULg; Sauvage, Eric ULg et al

Poster (2014, April 23)

Bacillus subtilis PBP4a belongs to the class-C1 PBPs characterized by two internal additional domains of unknown function. Seven lysine residues (K) are protruding from domain II. Four of them have been ... [more ▼]

Bacillus subtilis PBP4a belongs to the class-C1 PBPs characterized by two internal additional domains of unknown function. Seven lysine residues (K) are protruding from domain II. Four of them have been mutated in glutamine residues (Q). Both proteins (WT and Mut4KQ PBP4a) have been produced without signal peptide in E. coli and their sub-cellular localizations determined by measuring the DD-carboxypeptidase activities in the different compartments (cytoplasmic vs membrane attached proteins). In order to detect a possible influence of the PBP4a domain III in the localization of the protein, its encoding sequence has been cloned into pET-28b-BlaP, a vector allowing the production of WT BlaP β-lactamase or BlaP/DIII chimeric protein (with domain III inserted in a permissive loop of BlaP). The nitrocefin hydrolysis activities of BlaP or BlaP/DIII have been measured in the different cellular compartments. [less ▲]

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See detailThe archeological context of the last Neandertals and first Modern Humans in Europe
Flas, Damien ULg

Scientific conference (2014, April 23)

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See detailL'approche par compétences dans le cours de droit matériel européen
Sibony, Anne-Lise ULg

Diverse speeche and writing (2014)

Cette vidéo expose un exemple de mise ne oeuvre de l'approche par compétences dans le cadre d'un cours de droit européen (cours de 3ème année donné à 200 étudiants) et des séances d'exercices ... [more ▼]

Cette vidéo expose un exemple de mise ne oeuvre de l'approche par compétences dans le cadre d'un cours de droit européen (cours de 3ème année donné à 200 étudiants) et des séances d'exercices correspondantes. Elle est accompagnée d'un document qui illustre le propos par des exemples concrets (conseils donnés aux étudiants, corrigé d'exercice, grille d'évaluation). [less ▲]

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See detailLe psychopathe : apprésentation, chosification de l’alter ego et compétences émotionnelles
Englebert, Jérôme ULg

Conference (2014, April 23)

La psychopathie est une entité diagnostique « trouble », tant au sein de la tradition psychopathologique que dans les nosographies internationales contemporaines (DSM-IV et DSM-V). Le modèle faisant ... [more ▼]

La psychopathie est une entité diagnostique « trouble », tant au sein de la tradition psychopathologique que dans les nosographies internationales contemporaines (DSM-IV et DSM-V). Le modèle faisant autorité en psychologie forensic est celui développé par R.D. Hare (2003) à travers une échelle diagnostique appelée PCL-R. Ce modèle rencontre, d’un point de vue théorique, plusieurs apories, et, d’un point de vue clinique, de nombreuses impasses. Nous proposons de réaliser un exercice de compréhension psychopathologique axé sur notre pratique clinique en nous inspirant des recommandations du courant de la psychopathologie phénoménologique (Minkowski, 1966 ; Binswanger, 1960 ; Stanghellini, 2006 ; Sass, Parnas & Zahavi, 2011). Celui-ci suggère de procéder par la mise en évidence de la structure psychopathologique qui organise le fonctionnement psychologique du sujet. De façon plus précise, nous centrerons notre propos sur deux dimensions essentielles à l’être-au-monde psychopathique. D’une part, nous réaliserons une comparaison avec l’être-au-monde maniaque à travers les variables de l’apprésentation et de la chosification de l’alter ego – telles que les développe Binswanger (1960). Nous discuterons, d’autre part, du vécu émotionnel propre à la psychopathie qui est davantage source d’adaptation (du moins en certaines situations) que de carence véritable. Ce constat nous permettra de rediscuter brièvement de la notion d’empathie en psychopathologie. Nous verrons que ces dimensions propres à l’existence psychopathique font apparaitre une thématique explicitement absente de la nosographie de Hare, celle de la morale. [less ▲]

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See detailSpatio-Temporal Analysis of Equatorial Ionospheric Scintillations in the Frame of Absolute GNSS Positioning Algorithms
Lonchay, Matthieu ULg; Cornet, Yves ULg; Aquino, Marcio et al

Poster (2014, April 23)

The ionosphere has always been a major limitation for GNSS positioning applications. Free electrons in the ionosphere perturb the propagation of GNSS radio signals involving both refraction and ... [more ▼]

The ionosphere has always been a major limitation for GNSS positioning applications. Free electrons in the ionosphere perturb the propagation of GNSS radio signals involving both refraction and diffraction effects. The ionospheric refraction mainly results in a modification of the propagation speed of the GNSS electromagnetic signals, inducing an error (propagation delay or phase advance depending on the observable) in GNSS measurements. In the frame of absolute positioning techniques, single-frequency algorithms usually exploit an ionospheric model to mitigate the ionospheric error while dual-frequency algorithms, such as the well-known Precise Point Positioning (PPP), take the benefit of the availability of two frequencies and the fact that the ionosphere is a dispersive medium to construct an ionosphere-free mathematical model. But these two strategies are not able to counteract the effect of the ionospheric diffraction which is due to small-scale irregularities in the free electron density. By scattering GNSS signals, these irregularities generate rapid fluctuations (scintillations) in the amplitude and phase of GNSS signals with critical consequences for GNSS applications: cycle slips, signal power fading, receiver loss of lock and poor resulting satellite geometry. The goal of our research is to develop a strategy to mitigate the effect of ionospheric scintillations on absolute GNSS positioning techniques, in particular the SPP (Standard Point Positioning) and the PPP (Precise Point Positioning). The strategy is based on the adjustment of the stochastic model. In order to construct the stochastic model (diagonal and non-diagonal elements) and study the correlation between observables, we adopted a “spatial” and an “empirical” approach. The spatial approach consists in a study of the spatial autocorrelation existing in scintillations effects on GNSS signals. The spatial autocorrelation is detected by using specific spatial analysis techniques applied on data from a network of ISMR (Ionospheric Scintillation Monitoring Receiver) stations located at equatorial and polar latitudes, where scintillations effects are most severe. The knowledge of how scintillation effects are spatially correlated is helpful for determining a coherent stochastic model. The empirical approach does not take into account the phenomenon spatiality and the locations of the measurements but only the observation data. Its objective is to determine the statistical correlation which exists between GNSS measurements during a scintillation event by using a moving filter applied on GNSS observation and scintillation data. The spatial approach exploits data and data locations while the empirical approach is based only the data itself. [less ▲]

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See detailDavid Knoke, Economic networks
Dufays, Frédéric ULg

in Lectures (2014)

Detailed reference viewed: 14 (1 ULg)