Publications ORBi OA
Bookmark and Share    
Full Text
Peer Reviewed
See detailStochastic Inventory Routing for Perishable Products
Crama, Yves ULg; Rezaei Sadrabadi, Mahmood ULg; Savelsbergh, Martin et al

in Transportation Science (2017)

Different solution methods are developed to solve an inventory routing problem for a perishable product with stochastic demands. The solution methods are compared empirically in terms of average profit ... [more ▼]

Different solution methods are developed to solve an inventory routing problem for a perishable product with stochastic demands. The solution methods are compared empirically in terms of average profit, service level, and actual freshness. The benefits of explicitly considering demand uncertainty are quantified. The computational study highlights that in certain situations a simple ordering policy can already reach a very good performance, but that statistically and economically significant improvements are achieved when using more advanced solution methods. Managerial insights concerning the impact of shelf life and store capacity on profit are also obtained. [less ▲]

Detailed reference viewed: 27 (1 ULg)
Full Text
Peer Reviewed
See detailA Theory of Soft Capture
Agrell, Per; Gautier, Axel ULg

in Scandinavian Journal of Economics (2017), 119(3), 571-596

n this paper, wee propose a model for regulatory capture that is based on information transmission and asymmetric information. In a three-tier model, a regulator is charged by a political principal to ... [more ▼]

n this paper, wee propose a model for regulatory capture that is based on information transmission and asymmetric information. In a three-tier model, a regulator is charged by a political principal to provide a signal for the type of a regulated firm. Only the firm can observe his type and the production of a correlated signal with a given accuracy is costly for the regulator. The firm can costlessly provide an alternative signal of lower accuracy that is presented to the regulator. In a self-enforcing equilibrium, the regulator transmits the firm-produced signal, internalizes its own savings in information cost and the firm enjoys higher information rents. The main feature of soft capture is that it is not based on a reciprocity of favors but on a congruence of interests between the firm and the regulator. [less ▲]

Detailed reference viewed: 89 (22 ULg)
Full Text
Peer Reviewed
See detailGood practices in adapted physical activity for cancer patients and survivors: opinion of the Raviva program participants
Rompen, Jérôme ULg; Scharff, Jules; Cloes, Marc ULg

Conference (2017, July)

Introduction The Belgian Foundation against Cancer proposes an adapted physical activity (APA) program for cancer patients and survivors, called Raviva (http://www.cancer.be/raviva-bouger-pour-se-sentir ... [more ▼]

Introduction The Belgian Foundation against Cancer proposes an adapted physical activity (APA) program for cancer patients and survivors, called Raviva (http://www.cancer.be/raviva-bouger-pour-se-sentir-mieux).The activities are supervised by instructors with inconstant trainings and experiences. Contrary to other countries, Belgian APA instructors do not necessarily need to follow specific education programs such those proposed by the ACSM (Schmitz et al., 2010) or other organizations that propose exercise guidelines for cancer survivors. The aim of this study was to identify good practices in APA for cancer patients and survivors concerning activity characteristics and instructors behaviors, from the point of view of the Raviva program participants. Methods Firstly, an online questionnaire was submitted to Raviva participants; 72 of them filled it in. Secondly, 3 video-stimulated recall interviews were conducted after 3 different Raviva sessions (fitness, yoga and aqua-aerobics), each time with another participant. Results and discussion The sessions characteristics that participants like the most are related to the choice and quality of the proposed exercises (22% of responses) and to the perceived benefits of the activities (20%). The most appreciated qualities for an instructor are related to his/her human qualities (43%) and his/her expertise (32%). What participants like least about the sessions is a poor organization (27%) and what they like least about the instructors is linked to bad choices of exercises (18%). The video-stimulated recall interviews confirmed these data and provided more precision. Finally, we noticed that differences in responses were observed depending on the type of activity participants took part in. These findings could help instructors adapt their practices to their participants’ needs in order to promote adherence to physical activity among this population. References Schmitz, K. H., Courneya, K. S., Matthews, C., Demark-Wahnefried, W., Galvão, D. a, Pinto, B. M., … Schwartz, A. L. (2010). American College of Sports Medicine roundtable on exercise guidelines for cancer survivors. Medicine and Science in Sports and Exercise, 42(7), 1409‑26. https://doi.org/10.1249/MSS.0b013e3181e0c112 [less ▲]

Detailed reference viewed: 22 (3 ULg)
Full Text
Peer Reviewed
See detailWEATHERING ON THE DEVONIAN SLATES AND CHARACTERIZATION OF A BENTONITE LAYER IN THE WESTERWALD (GERMANY)
Fontaine, François ULg; Hamaekers, Helen; Hoffmann, Andreas et al

Conference (2017, July)

The Westerwald region is one of the largest and oldest clay mining areas of Germany. Those deposits were formed during the Eocene and Oligocene as a result of the weathering, erosion and redeposition of ... [more ▼]

The Westerwald region is one of the largest and oldest clay mining areas of Germany. Those deposits were formed during the Eocene and Oligocene as a result of the weathering, erosion and redeposition of Devonian rocks. During the Miocene, intense volcanic activities led to a large basalt cover, protecting the clays from the erosion. The two main goals of this study are first to improve the knowledge on the weathering processes of the Devonian slates that led to the current setting of those clay deposits by studying the mineralogical and chemical composition of the clays with depth. The second goal is to characterize a bentonite layer underneath the Miocene basalt cover using quantitative X-ray diffraction, chemical analysis, BET, cation exchange capacity and scanning electron microscope. A 20 meter deep quarry mining the Devonian bedrock in southern Westerwald has been sampled on its entire depth. The XRD results show no significant variations of the mineralogy with depth, except for the phyllosilicates. The minerals of the < 2 μm fraction are illite, kaolinite, smectite and mixed-layers minerals (vermiculite-chlorite and illite-chlorite). The proportions of the minerals in the mixed-layers chlorite-vermiculite vary with depth. At the bottom of the quarry, the proportion of vermiculite is very low while in the top, the proportion of vermiculite is higher. This is explained by the degree of the weathering, logically more intense at the top of the quarry. Trace elements compositions are currently being investigated. A 3 meter thick greenish to brownish bentonite layer has been found in the eastern part of the Westerwald region. The XRD performed on different samples of this bentonite shows a relatively heterogeneous composition: montmorillonite (60-80%), kaolinite (5-12%), illite (0-7%), goethite (2-15%), talc (0-10%), K-feldspars (0-7%), plagioclase (0-4%) and traces of amphibole and pyroxene. This bentonite is probably the result of the weathering of volcanic ashes. Since there are not many outcrops of this bentonite layer, its spatial distribution is studied by drilling. [less ▲]

Detailed reference viewed: 31 (2 ULg)
Full Text
See detailAgency and delinquency among adolescence during their transition to adulthood: what role in the desistance process?
Puglia, Rosa ULg; Glowacz, Fabienne ULg

Poster (2017, June 31)

Recent studies have shown that agency plays an important role in the desistance process. This variable allows the transition from delinquent identity to non-delinquent identity. However, despite ... [more ▼]

Recent studies have shown that agency plays an important role in the desistance process. This variable allows the transition from delinquent identity to non-delinquent identity. However, despite increasing literature about this topic, there is a lack of consensus regarding the role of this variable in the desistance process. Also, the way to measure this phenomenon remains unclear. In our study, agency is thought within a border framework, namely the understanding of all kind of behavior. According to the social cognitive theory, emotional and cognitive processes influence human behavior: emotions and thoughts that will define ways of acting and will motivate behavioral changes. Outcomes expectancies can be help or hinder for the concretization of behavioral change. We conducted a qualitative research among adolescents (aged 17-18) who are engaged in a delinquent trajectory. Our objective are to understand how these young in transition to adulthood leave delinquent lifestyle by evaluating to their life course and delinquent course. Each participant was interviewed with a semi-structured interview. To ensure that the interviews provided rich insights into participants’ reality, the interview was designed to elicit detailed information on relevant themes including identity, turning point, future and delinquency trajectory. Desistance was not explicitly questioned. All interviews were taperecorded and analyzed using IPA method (Smith, 2003). Mastery Scale (Pearlin, 1978), Causal Attribution Scale (Rossier, 2002), Hope Scale (Snyder, 1991) and University Rhode Island Change Assessment Scale (McConnaughy, 1983) were also administered. We see that the younths interviewed are at different stage in their desistance process. All of them, persistent or desistant, consider taking a hold on their lives. These results encourage thinking agency in the understanding of all kind of behavior. We should then take into account the beliefs and expectations of results as a variable mediating the relationship between agency and desistance. [less ▲]

Detailed reference viewed: 18 (1 ULg)
Full Text
See detailAntarctic cyanobacteria: from diversity to genomics
Wilmotte, Annick ULg

Conference (2017, June 30)

Detailed reference viewed: 17 (0 ULg)
Full Text
Peer Reviewed
See detailNatural and induced loss of function mutations in SlMBP21 MADS-box gene led to jointless-2 phenotype in tomato
Gomez Roldan, Maria Victoria; Périlleux, Claire ULg; Morin, Halima et al

in Scientific Reports (2017), 7

Abscission is the mechanism by which plants disconnect unfertilized flowers, ripe fruits, senescent or diseased organs from the plant. In tomato, pedicel abscission is an important agronomic factor that ... [more ▼]

Abscission is the mechanism by which plants disconnect unfertilized flowers, ripe fruits, senescent or diseased organs from the plant. In tomato, pedicel abscission is an important agronomic factor that controls yield and post-harvest fruit quality. Two non-allelic mutations, jointless (j) and jointless-2 (j-2), controlling pedicel abscission zone formation have been documented but only j-2 has been extensively used in breeding. J was shown to encode a MADS-box protein. Using a combination of physical mapping and gene expression analysis we identified a positional candidate, Solyc12g038510, associated with j-2 phenotype. Targeted knockout of Solyc12g038510, using CRISPR/Cas9 system, validated our hypothesis. Solyc12g038510 encodes the MADS-box protein SlMBP21. Molecular analysis of j-2 natural variation revealed two independent loss-of-function mutants. The first results of an insertion of a Rider retrotransposable element. The second results of a stop codon mutation that leads to a truncated protein form. To bring new insights into the role of J and J-2 in abscission zone formation, we phenotyped the single and the double mutants and the engineered alleles. We showed that J is epistatic to J-2 and that the branched inflorescences and the leafy sepals observed in accessions harboring j-2 alleles are likely the consequences of linkage drags. [less ▲]

Detailed reference viewed: 58 (3 ULg)
Full Text
See detailPlant traits variability within and among populations in the context of calcareous grassland restoration
Harzé, Mélanie ULg

Doctoral thesis (2017)

In Western Europe, abandonment of traditional forms of agriculture has caused the fragmentation of semi-natural grasslands, affecting ecosystems functioning as well as population survival. Habitat ... [more ▼]

In Western Europe, abandonment of traditional forms of agriculture has caused the fragmentation of semi-natural grasslands, affecting ecosystems functioning as well as population survival. Habitat restoration has become a crucial aspect of grasslands conservation, and one of the main issues is evaluating restoration success and setting appropriate criteria to do so. Indicators used to judge whether a restoration has been successful may concern a wide range of organisms. They may be defined at different geographical scales and may concern various levels of biodiversity organization. Among them, population parameters are less represented despite their usefulness. To consider restoration as a success, restored populations of targeted species should demonstrably possess characteristics allowing their dispersal, reproduction, growth and adaptation to the environment. In this thesis, the use of plant population parameters for evaluating grassland restoration was assessed based on a literature review. Then, the success of calcareous grassland restoration was determined regarding colonization of restored grasslands by five calcareous grasslands species; Helianthemum nummularium, Hippocrepis comosa, Potentilla tabernaemontani, Sanguisorba minor and Scabiosa columbaria. Population establishment and intra-specific functional trait variability in response to the environment were observed and compared among restored and reference populations of those species, through field inventories and in-situ traits measurements in calcareous grasslands of south Belgium. Moreover, a glasshouse experiment was set-up with the aim to evaluate the intra-specific variability in response to drought stress in reference populations of P. tabernaemontani. The results indicated that population parameters were less well studied for evaluating grassland restoration success compared to indicators related to ecosystems and communities. The population parameters used to assess the success of calcareous grassland restoration showed that the study species colonized restored sites and established new populations. The fitness of the restored populations was very high. High intra-specific trait variability was highlighted at a very local scale in the reference habitat. Individuals exhibited high leaf dry matter content (LDMC), low specific leaf area (SLA) and low vegetative height in relation to low soil depth and high potential incident radiation (PDIR). These environmental variables are possibly linked to the availability of soil moisture. Further, the relationship between traits and environmental variables was not always consistent in restored sites. However, the intra-specific variability of plant traits was similar in the reference and restored grasslands. Finally, the findings from the glasshouse experiment suggested that individuals originating from drier parts of calcareous grasslands better survive drought stress.   The overall conclusion of this thesis is rather optimistic concerning restored populations of the five specialist plant species studied, specifically regarding their colonization, persistence and response to the environment or to potential climate change. The conclusions must, however, be modified depending on the reference ecosystem used as a model. This approach has to be integrated into a multi-scales and a multi-species approach to fully evaluate restoration outputs. Yet, this thesis has contributed to the understanding of population responsiveness to habitat restoration, as well as to the evaluation of restoration success of calcareous grasslands in Belgium. [less ▲]

Detailed reference viewed: 33 (7 ULg)
Full Text
Peer Reviewed
See detailSpatial OnLine Analytical Processing Applied to Cities Security with Raster Data - A Case Study on Emergency Services of Brussels Agglomeration
Kasprzyk, Jean-Paul ULg; Devillet, Guénaël ULg

Conference (2017, June 29)

Public institutions in charge of cities security are confronted to always more complex and voluminous data. In particular, georeferenced data can be extracted from many sources: mobile phones, social ... [more ▼]

Public institutions in charge of cities security are confronted to always more complex and voluminous data. In particular, georeferenced data can be extracted from many sources: mobile phones, social media, cars, security camera, satellite images, crowdsourcing, geography portals, etc. Uses of these data are various. For instance, it is very precious to firefighters in order to fairly distribute their resources (equipment and men) on the territory. These large spatial data sets (“Big Data”) require powerful tools for their extraction and their analysis. For this purpose, an original Spatial OnLine Analytical Processing (SOLAP) model is developed for emergency services. A case study involving firefighters and medical aids of Brussels is presented [less ▲]

Detailed reference viewed: 20 (1 ULg)
Full Text
Peer Reviewed
See detailThe influence of health concerns in scientific and policy debates on climate change
Schütte, Stefanie; Depoux, Anneliese; Vigil Diaz Telenti, Sara ULg et al

in Journal of Epidemiology & Community Health (2017)

Detailed reference viewed: 38 (0 ULg)
Full Text
See detailExperimental characterisation of tape spring nonlinear compliant mechanisms
Dewalque, Florence ULg; Schwartz, Cédric ULg; Denoël, Vincent ULg et al

Conference (2017, June 29)

Tape springs are compliant mechanisms used as alternative to kinematic joints, for example, in deployable space structures. To reach a detailed understanding of their highly nonlinear behaviour, involving ... [more ▼]

Tape springs are compliant mechanisms used as alternative to kinematic joints, for example, in deployable space structures. To reach a detailed understanding of their highly nonlinear behaviour, involving buckling, the formation of folds, nonlinear vibrations and hysteresis, an experimental set-up is designed. Dynamic and quasi-static tests are performed, as well as small amplitude vibration tests and large amplitude deployments in order to collect data in a broad variety of cases. The acquisition equipment consists of a 3D motion analysis system which triangulates the position of active markers and a force plate. The reproducibility of the acquisitions is assessed and the parameters affecting the measurements are identified. In the end, a finite element model is developed and correlated with the experimental results. [less ▲]

Detailed reference viewed: 29 (2 ULg)
Full Text
Peer Reviewed
See detailSpaces of in-between-ness and unbelonging: The hotel in short stories by Sefi Atta and Chimamanda Ngozi Adichie
Toivanen, Anna-Leena ULg

in English Studies in Africa (2017), 60(1), 1-11

Spaces of in-between-ness and unbelonging: The hotel in short stories by Se fi Atta and Chimamanda Ngozi Adichie Anna-Leena Toivanen The fi gure of the migrant has become a paradigmatic representative of ... [more ▼]

Spaces of in-between-ness and unbelonging: The hotel in short stories by Se fi Atta and Chimamanda Ngozi Adichie Anna-Leena Toivanen The fi gure of the migrant has become a paradigmatic representative of globalised postcoloniality. Yet, not all ‘ postcolonial ’ mobilities can be equated with migration. Cases in point are the travelling African protagonists of two diasporic Nigerian short stories, Se fi Atta ’ s ‘ Housekeeping ’ (2010) and Chimamanda Ngozi Adichie ’ s ‘ Transition to Glory ’ (2006). The short stories feature the fi gures of the African leisure traveller, tourist, and, in particular, hotel guest. The hotel articulates different dimensions of a site that is frequently conceived, both in fi ction and in theory, as a place and symbol of in-between- ness, deviance and displacement. In ‘ Housekeeping ’ , the hotel serves as a setting for exploring the socio-economic differences between migrant travellers and symbolises a sense of diasporic unbelonging. In ‘ Transition to Glory ’ ,the hotel room is used as a setting and symbol for an adulterous relationship. It comes across as a space of deviance which is not properly inscribed either in the private/domestic or the public. While set in spaces of in-between-ness and transit, both texts articulate metaphorical senses of longing for home. By analysing the literary representation of the hotel trope, this article contributes to widening the scope of how postcolonial mobilities can be understood. [less ▲]

Detailed reference viewed: 25 (1 ULg)
Full Text
See detailThe Politics of Zoning: Making Risks (In)visible in Disasters
Hasegawa, Reiko ULg

Scientific conference (2017, June 29)

Zoning or hazard mapping exercise is often utilized by policymakers and public authorities to manage disaster risks. This exercise is only possible when potential risks have already been identified ... [more ▼]

Zoning or hazard mapping exercise is often utilized by policymakers and public authorities to manage disaster risks. This exercise is only possible when potential risks have already been identified, quantified and assessed by scientific experts at the outset. In other words, unidentified or unrecognized risks will not appear on the map, hence become invisible from administrators and the public. As Ulrich Beck (2008) described, “so long as risks are not recognized scientifically, they do not exist – at least not legally, medically, technologically, or socially, and thus they are not prevented, treated or compensated for”. This paper examines the role of expert institutions and authorities in defining, thus making (in)visible, risks through zoning/mapping exercise prior to and in the aftermath of disasters. This map, once established, forms the legitimate base and functions as the authority to categorize citizens into different status and its associated rights. The paper attempts to deconstruct this transformation process of hazards into risks, the territorialisation of risks via mapping, whereby matters that are scientifically uncertain or intangible would be made circumscribable both spatially and temporally. Our paper uses two case studies, one on evacuation zones after the Fukushima nuclear disaster and the other on hazard mapping prior to volcano eruptions in the Lesser Antilles, to illustrate how this political and administrative tool of zoning reifies hazards, thus making any disaster risks appear “manageable” and controllable by the authorities, and results in creating de facto different categories of affected populations, which triggers tension and division within the communities as well as in the scientific community. We also examine the role of independent experts and citizen mobilisations in challenging these zoning policies and contesting the management of territorialised risks. [less ▲]

Detailed reference viewed: 18 (3 ULg)
Full Text
See detailEvaluation des enseignements par les étudiants :  évaluer pour évoluer
Detroz, Pascal ULg

Scientific conference (2017, June 29)

Detailed reference viewed: 25 (1 ULg)