References of "Schyns, Michael"
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See detailCovid-19: contribution of clinical characteristics and laboratory features for early detection of patients with high risk of severe evolution
Sepulchre, Edith; Pittie, Guillaume; Stojkovic, Violeta et al

in Acta Clinica Belgica (in press)

The aim of this study was to identify early clinical and laboratory predictive factors of a severe coronavirus disease 2019 (COVID-19). The study revealed clinical and laboratory features able to predict ... [more ▼]

The aim of this study was to identify early clinical and laboratory predictive factors of a severe coronavirus disease 2019 (COVID-19). The study revealed clinical and laboratory features able to predict high risk of ICU requirement, or even death, at admission time. These results provide a potential tool for patient’s triage in a context of pandemic. [less ▲]

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See detailSPEAKinVR: validation of a virtual audience
Etienne, Elodie ULiege; Leclercq, Anne-Lise ULiege; Remacle, Angélique ULiege et al

Conference (2020, April 30)

The main goal of this paper is to validate a virtual reality environment for public speaking training. Following Slater’s terminology (2003), there are two important concepts in VR: “immersion which ... [more ▼]

The main goal of this paper is to validate a virtual reality environment for public speaking training. Following Slater’s terminology (2003), there are two important concepts in VR: “immersion which stands for what the technology delivers from an objective point of view” and presence which is “the human reaction to immersion”, i.e., the participant’s subjective sense of being in the virtual place. The reactions of the audience can have a significant impact on the speaker’s emotions and performance. At a first level, our hypothesis is that interactivity has a positive impact on the presence feeling. At a higher level, as already shown by Chollet et al. (2015), interactivity in VR is also a major ingredient in the training process. It is therefore essential to know if the users perceive the interactions in the virtual environment as representative of the reality and how each one is interpreted. There are two main dimensions in the context of emotion and affect: arousal and valence. As defined by Chollet and Scherer (2017), “arousal can be understood as an audience member’s level of alertness, and valence corresponds to how positively or negatively the person feels toward the speaker or the presentation”. In their paper, they tried to understand how users perceive virtual audience based on the nonverbal behavior of audience members. Our first question is to investigate which attitudes the characters must display and how people perceive the individual members of the audience in terms of their states of arousal and valence. A second related question is linked to the level of reality used to represent the public. The characters in virtual environments, i.e. avatars, are most often synthetic images. In some cases, photorealistic representations are used but the level of animation is then generally extremely limited. In this context, our second research question investigates whether the use of fully rigged 3D photogrammetric models, i.e. with a skeleton we can animate, can significantly improve the user’s presence. [less ▲]

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See detailSPEAKInVR : Validation d’une audience virtuelle
Etienne, Elodie ULiege; Leclercq, Anne-Lise ULiege; Remacle, Angélique ULiege et al

Scientific conference (2020, March 12)

Nowadays public speaking is one of the most important skills a person should develop. Such a skill is vital in many circumstances and in very different fields: the sales representative who presents a ... [more ▼]

Nowadays public speaking is one of the most important skills a person should develop. Such a skill is vital in many circumstances and in very different fields: the sales representative who presents a product to customers, the tourist guide visiting a city with a group, the manager who defends his project in front of stakeholders, the candidate during a job interview, the professor in front of students… Unfortunately, many firms complain about the too low level of this skill within their staff. The global theme of our work is to look for innovative solutions leading to an improvement of public speaking performances. The global project aims to help people to speak in public by training them in a realistic and interactive VR environment providing some feedbacks. Unity 3D engine was used to create a first basic version of the tool. 3D avatars have been designed and animated to represent some common audience postures, corresponding to different degrees of arousal and valence, and some classical situations as people typing on laptops or playing with smartphones. 3D photogrammetric versions of these avatars will soon be completed for testing increased realism. The objective of this presentation is to validate the virtual audience. [less ▲]

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See detailPredictive Maintenance of Technical Faults in Aircraft
Peters, Florian ULiege; Aerts, Stéphanie ULiege; Schyns, Michael ULiege

Conference (2020, January 30)

A key issue for handlers in the air cargo industry is arrival delays due to aircraft maintenance. This work focuses on a particular delay caused by technical faults called technical delays. Using real ... [more ▼]

A key issue for handlers in the air cargo industry is arrival delays due to aircraft maintenance. This work focuses on a particular delay caused by technical faults called technical delays. Using real data from a cargo handler company, different classification models that can predict technical delay occurrence are compared. A new decision tree extension is also proposed based on a study by Hoffait & Schyns (2017). The final results present a good starting point for future research. [less ▲]

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See detailThe contribution of augmented reality in architectural education
Gantjimirov, Hassan; Leblanc, Pierre ULiege; Schyns, Michael ULiege et al

Conference (2019, November)

Despite its importance, the specific issue of performance and reading of sketches in augmented reality does not seem to have been analyzed recently. Indeed, even if many articles have been published in ... [more ▼]

Despite its importance, the specific issue of performance and reading of sketches in augmented reality does not seem to have been analyzed recently. Indeed, even if many articles have been published in connection with VR or RA in architecture, the questions studied are very varied and often related to specific applications. Recent literature, based on new technologies available since 2016, is also very limited. The research presented here was carried out within the pedagogical framework offered by the construction course taught to first-year students in the Faculty of Architecture of ULiège. The general objective of this course is to introduce students to a graphic approach framework that links construction technologies to the development of an architectural project. Students explore different construction techniques through the drawing of technical details. A first exploratory approach was carried out last year during the development of a prototype. It shows us the feasibility of the project and some pitfalls to avoid. The main objective of the project is to study the impact of augmented reality on the performance and skills acquisition of architecture students. It focuses on reading plans and sketches of technical construction drawings in order to identify the contributions of 3D spatialization. [less ▲]

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See detailComment placer l'humain au centre de mon projet en réalité augmentée ou virtuelle
Schyns, Michael ULiege

Conference given outside the academic context (2019)

La VR/AR/XR a connu un renouveau récemment avec du matériel plus performant et plus accessible. Beaucoup de questions se posent encore alors que les experts reconnaissent un potentiel énorme pour ces ... [more ▼]

La VR/AR/XR a connu un renouveau récemment avec du matériel plus performant et plus accessible. Beaucoup de questions se posent encore alors que les experts reconnaissent un potentiel énorme pour ces technologies (Apple’s CEO Tim Cook: “[Augmented Reality] I regard it as a big idea like the smartphone ” ). Cela amène à deux démarches de notre part. D’une part, mon service teste de nouvelles technologies et approches pour rendre les environnements créés plus réalistes, confortables et performants. D’autre part, notre équipe analyse l’impact réel de la RV/AR/XR sur les processus d’apprentissage et de gestion des entreprises. Sur cette base, nous tentons d’optimiser les environnements pour un retour maximum. Trois questions sont en particulier soulevées dans cette présentation: Comment augmenter les capacités d’apprentissage ? Comment faire pour que l’humain reste au centre d’un projet d’AR/VR ? Comment le succès de toute technologie se définit par le fait qu’elle devient invisible ? [less ▲]

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See detailDévelopper des environnements virtuels pour l'enseignement. Teaching with VR
Billen, Roland ULiege; Dozo, Björn-Olav ULiege; Etienne, Anne-Marie ULiege et al

Scientific conference (2018, December 19)

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See detailExperimental investigation of decision-making processes in daily physically active behaviors using a virtual reality set-up
Ruffault, Alexis ULiege; Cloes, Marc ULiege; Schyns, Michael ULiege et al

Poster (2018, August)

Background: Energy expenditure provided by physical activity (PA) can be significantly increased by daily behaviors (stair use, walking). However, factors from the environment, and motivational and ... [more ▼]

Background: Energy expenditure provided by physical activity (PA) can be significantly increased by daily behaviors (stair use, walking). However, factors from the environment, and motivational and volitional processes, tend to impact the decisions when an active solution (stairs) is available at the same time as an inactive solution (elevator). The aim of this study is to identify the decision-making processes implicated in daily PA when time and effort to reach an objective (e.g., a meeting) vary. Methods: 150 healthy adults will be randomized to one of three experiments after filling out questionnaires measuring habits regarding PA, motivational, and volitional factors of PA adoption. Experiment 1 is a first-person 3D interactive movie where 3 actors are waiting at the point-of-decision, where peers’ behaviors and availability of the inactive solution vary. Experiment 2 is a virtual replication of a business school, where previous knowledge of the building and disposition of the stairs (hidden/visible) vary. Experiment 3 is a virtual modified version of the business school where a stairwell and an escalator provide access to the first floor, using implicit (steps on the floor) and explicit (motivational messages) as point-of-decision prompts. Expected results: Results will be analyzed in line with the integrated behavior change model (Hagger & Chatzisarantis, 2014) and the naturalistic decision-making theory (Klein, 2015). Current stage of work: Participants will be contacted for experimentations from February to June 2018. Discussion: Real time decision-making processes will be linked to processes of change regarding PA, allowing for recommendations for future interventional designs. [less ▲]

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See detailModeling competition among airline itineraries
Lurkin, Virginie ULiege; Garrow, Laurie A.; Higgins, Matthew J. et al

in Transportation Research. Part A, Policy and Practice (2018), 113

Discrete choice models are commonly used to forecast the probability an airline passenger chooses a specific itinerary. In a prior study, we estimated an itinerary choice model based on a multinomial ... [more ▼]

Discrete choice models are commonly used to forecast the probability an airline passenger chooses a specific itinerary. In a prior study, we estimated an itinerary choice model based on a multinomial logit specification that corrected for price endogeneity. In this paper, we extend the analysis to include inter-itinerary competition along three dimensions: nonstop versus connecting level of service, carrier, and time of day using nested logit (NL) and ordered generalized extreme value (OGEV) models. To the best of our knowledge, these are the first NL and OGEV itinerary choice models to correct for price endogeneity. Despite the many structural changes that have occurred in the airline industry, our results are strikingly similar to models estimated more than a decade ago. These results are important because it suggests that customer preferences, on average, have been stable over time and are similar across distribution channels. The stability in inter-itinerary competition patterns provides an important practical implication for airlines, namely it reduces the need to frequently update the parameter estimates for these models. [less ▲]

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See detailA tailored two-phase constructive heuristic for the three-dimensional Multiple Bin Size Bin Packing Problem with transportation constraints
Paquay, Célia ULiege; Limbourg, Sabine ULiege; Schyns, Michael ULiege

in European Journal of Operational Research (2018), 267(1), 52-64

This paper considers the three-dimensional Multiple Bin Size Bin Packing Problem which consists in packing a set of cuboid boxes into containers of various shapes with minimising unused space. The problem ... [more ▼]

This paper considers the three-dimensional Multiple Bin Size Bin Packing Problem which consists in packing a set of cuboid boxes into containers of various shapes with minimising unused space. The problem is extended to air cargo where bins are Unit Load Devices, especially designed for fitting in aircraft. We developed a fast constructive heuristic able to manage the different constraints met in transportation. The heuristic is split into two distinct phases. The first phase deals with the packing of boxes into identical bins using an extension of the Extreme Points. During this phase, the fragility, stability and orientations of the boxes are taken into account as well as the special shape of the bins and their weight capacity. The second phase takes into account the multiple types of available bins. If necessary, the best found loading pattern is finally enhanced with respect to weight distribution in a post processing. After parametrisation, computational experiments have been performed on data sets especially designed for this application. The heuristic requires really short computational times to achieve promising results. [less ▲]

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See detailUNITÉ DE RECHERCHE LIÈGE – QUÉBEC SUR LE NUMÉRIQUE EN SANTÉ GLOBALE, EN ENSEIGNEMENT ET EN FORMATION CONTINUE UNIVERSITAIRE
Etienne, Anne-Marie ULiege; Bouchard, Stéphane; Billen, Roland ULiege et al

Speech/Talk (2018)

The promoters of the project are the University of Liège, represented by Rector Albert CORHAY, and the Université du Québec en Outaouais, represented by Rector Denis HARRISSON. The academic leaders are ... [more ▼]

The promoters of the project are the University of Liège, represented by Rector Albert CORHAY, and the Université du Québec en Outaouais, represented by Rector Denis HARRISSON. The academic leaders are: for the University of Liège, Anne-Marie ETIENNE, Professor and Vice-Dean for Education and for the Université du Québec en Outaouais, Stéphane BOUCHARD, Professor and Holder of the Canada Research Chair in Cyberpsychology Clinical. As part of the strategic plan of the University of Liège, the global project of digital use is part of two major societal challenges namely education and digital technology, health and society. This global digital use project focuses on teaching, research and citizenship missions and on the individual, his community and the society in which he lives. The specific objectives of this collaboration are to (1) Develop support tools for the university community, (2) Offer awakening or support workshops in complementarity with the community and (3) Ensure a monitoring mandate and knowledge sharing. Exchanges between the two partners can be carried out along different axes, namely initial training and continuing training; the development of joint research projects or mobility through exchanges of students, teachers, researchers, technicians and experts. [less ▲]

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See detailMIP-based constructive heuristics for the three-dimensional Bin Packing Problem with transportation constraints
Paquay, Célia ULiege; Limbourg, Sabine ULiege; Schyns, Michael ULiege et al

in International Journal of Production Research (2018), 56(4), 1581-1592

This article is about seeking a good feasible solution in a reasonable amount of computation time to the three-dimensional Multiple Bin Size Bin Packing Problem (MBSBPP). The MBSBPP studied considers ... [more ▼]

This article is about seeking a good feasible solution in a reasonable amount of computation time to the three-dimensional Multiple Bin Size Bin Packing Problem (MBSBPP). The MBSBPP studied considers additional constraints encountered in real world air transportation situations, such as cargo stability and the particular shape of containers. This MBSBPP has already been formulated as a Mixed Integer linear Programming problem, but as yet only poor results have been achieved for even fairly small problem sizes. The goal of the work this paper describes is to develop heuristics that are able to quickly provide good initial feasible solutions for the MBSBPP. Three methodologies are considered, which are based on the decomposition of the original problem into easier subproblems: the matheuristics Relax-and-Fix, Insert-and-Fix and Fractional Relax-and-Fix. They have been parametrised on real data sets and then compared to each other. In particular, two of these techniques show promising results in reasonable computational times. [less ▲]

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See detailAssessing and predicting review helpfulness: Critical review, open challenges and research agenda
Hoffait, Anne-Sophie ULiege; Ittoo, Ashwin ULiege; Schyns, Michael ULiege

E-print/Working paper (2018)

The issues of determining what makes a customer review helpful and how to predict review helpfulness have received significant attention in recent years. However, the current literature is highly ... [more ▼]

The issues of determining what makes a customer review helpful and how to predict review helpfulness have received significant attention in recent years. However, the current literature is highly heterogeneous with contradictory findings. We critically synthesize extant literature and identify factors responsible for these contradictions which we classify into four dimensions, viz. datasets, features, approach and review helpfulness operationalization, and clarify the prevailing confusion. We highlight research gaps, and propose novel research directions to bridge them and to advance the state-of-the-art. We provide resources such as synthetic tables, which summarize past research and develop a (future) research roadmap. These resources not only provide a concise overview of current research, but also illustrate its heterogeneity and serve as a valuable basis to ground future research. [less ▲]

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See detailSpecial issue: Twelfth Workshop on Models and Algorithms for Planning and Scheduling Problems (MAPSP 2015)
Crama, Yves ULiege; Goossens, Dries; Leus, Roel et al

in Journal of Scheduling (2017), 20(6), 543-711

This special issue of the Journal of Scheduling contains ten papers presented at the Twelfth Workshop on Models and Algorithms for Planning and Scheduling Problems (MAPSP 2015), held from June 8 to June ... [more ▼]

This special issue of the Journal of Scheduling contains ten papers presented at the Twelfth Workshop on Models and Algorithms for Planning and Scheduling Problems (MAPSP 2015), held from June 8 to June 12, 2015, in La Roche-en-Ardenne, Belgium. [less ▲]

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See detailTeaching with VR. Développer des environnements virtuels pour l'enseignement en sciences humaines
Billen, Roland ULiege; Dozo, Björn-Olav ULiege; Etienne, Anne-Marie ULiege et al

Conference (2017, November 23)

Présentation du projet Teaching with VR, qui associe des enseignants-chercheurs de 4 facultés pour développer des environnements en réalité virtuelle au service de l'enseignement en sciences humaines ... [more ▼]

Présentation du projet Teaching with VR, qui associe des enseignants-chercheurs de 4 facultés pour développer des environnements en réalité virtuelle au service de l'enseignement en sciences humaines. Trois environnements sont montrés, qui peuvent être déclinés pour différentes disciplines (psychologie, architecture, marketing, etc.), en fonction de dispositifs ajoutés aux environnements. [less ▲]

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See detailTeaching with VR. Développer des environnements virtuels au service de l’enseignement en sciences humaines et sociales
Billen, Roland ULiege; Dozo, Björn-Olav ULiege; Etienne, Anne-Marie ULiege et al

Conference given outside the academic context (2017)

L’élaboration d’environnements de réalité virtuelle requiert des compétences pluridisciplinaires. A l’ULiège, un groupe d’enseignants-chercheurs, le groupe « Teaching with VR », ont mis en commun leurs ... [more ▼]

L’élaboration d’environnements de réalité virtuelle requiert des compétences pluridisciplinaires. A l’ULiège, un groupe d’enseignants-chercheurs, le groupe « Teaching with VR », ont mis en commun leurs savoir-faire et expériences spécifiques sur la réalité virtuelle et les environnements en 3 dimensions afin de développer plusieurs environnements supports à différents enseignements dans le secteur des sciences humaines (psychologie, marketing, logistique, archéologie du bâti, didactique de l’histoire, game design, game studies…). [less ▲]

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See detailEarly Detection of University Students with Potential Difficulties
Hoffait, Anne-Sophie ULiege; Schyns, Michael ULiege

in Decision Support Systems (2017), 101

Using data mining methods, this paper presents a new means of identifying freshmen's profiles likely to face major difficulties to complete their first academic year. Academic failure is a relevant issue ... [more ▼]

Using data mining methods, this paper presents a new means of identifying freshmen's profiles likely to face major difficulties to complete their first academic year. Academic failure is a relevant issue at a time when post-secondary education is ever more critical to economic success. We aim at early detection of potential failure using student data available at registration, i.e. school records and environmental factors, with a view to timely and efficient remediation and/or study reorientation. We adapt three data mining methods, namely random forest, logistic regression and artificial neural network algorithms. We design algorithms to increase the accuracy of the prediction when some classes are of major interest. These algorithms are context independent and can be used in different fields. Real data pertaining to undergraduates at the University of Liège (Belgium), illustrates our methodology. [less ▲]

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