Last 7 days
Bookmark and Share    
See detailKnowledge assessment with concept maps: Opportunities and challenges
Rohles, Björn UL; Koenig, Vincent UL; Fischbach, Antoine UL et al

Presentation (2021, July)

21st-century digital society poses tremendous challenges for education and assessment. Learners have to understand the complex relations between diverse topics and learn how to learn their entire lives ... [more ▼]

21st-century digital society poses tremendous challenges for education and assessment. Learners have to understand the complex relations between diverse topics and learn how to learn their entire lives. Concept mapping is a promising approach to address these issues. It is a method that uses concepts connected by labeled links to visualize a semantic network of knowledge. Concept mapping is predestined for a digital approach because it allows for easy interactive editing, innovative test items, and incorporation of multimodal information. Concept mapping is available for summative and formative assessment and, thus, provides the opportunity to become a vital part of modern education. The biggest advantage of concept mapping (i.e., a comprehensive and yet comprehensible visualization of complex relations) also represents the biggest challenge when it comes to assessment with - and scoring of - concept maps. The first challenge is the enormous amount of indicators used for scoring concept maps in assessment. A second challenge comes from the fact that educators using concept mapping in their assessment have to understand and interpret the indicators that are used in scoring concept maps. This presentation reports on a Ph.D. project that investigates digital concept mapping in the context of knowledge assessment from a user experience perspective. The results are based on, first, a comprehensive international systematic literature review on concept map scoring, and second, three empirical studies covering the needs and experiences of learners and educators in concept mapping. It presents key findings from the iterative user experience design of a concept mapping tool as part of the online assessment platform OASYS, an overview of indicators used in concept map scoring, and research opportunities in knowledge assessment with concept maps. Finally, it stresses the value that user experience design brings to knowledge assessment with concept maps. [less ▲]

Detailed reference viewed: 47 (0 UL)
See detailSmall in size, great in significance: conspicilla and perspicilla in the visual arts of the Low Countries around 1600
Koeleman, Floor UL

Scientific Conference (2021, July)

A largely forgotten constcamer painting from the early seventeenth century shows eyeglasses and a telescope in close proximity. The inclusion of these extensions of sight in The Five Senses of the Musée ... [more ▼]

A largely forgotten constcamer painting from the early seventeenth century shows eyeglasses and a telescope in close proximity. The inclusion of these extensions of sight in The Five Senses of the Musée Magnin (Dijon) seems to allude to the implicit link between the two. As tools to observe with and through, these instruments visualize the limits of human perception and the ability to alter the scale of the visible world. The Five Senses was created in Antwerp around the same time the telescope first appeared in textual sources, namely 1608. However, the optical instrument is likely to have existed for years by then. This paper investigates if any references to the telescope in the visual arts predate the first written evidence of its invention. For artists the early telescope was probably not that challenging an object to represent. The exterior, a simple tube characterized by a diaphragm, housed two lenses made by the same glass industry that manufactured eyeglasses. This paper takes a closer look at the imagery of eyeglasses and telescopes, depicted in the visual arts of the late sixteenth and early seventeenth centuries. The meaning assigned to these instruments can be inferred from the context in which they are presented and their relative scale. Together eyeglasses and telescopes feature prominently in constcamer paintings dedicated to visual perception, understood both physically and metaphysically. While the exact date of creation remains subject to debate, The Five Senses probably contains the earliest known depiction of a telescope – true to scale. [less ▲]

Detailed reference viewed: 151 (1 UL)
Full Text
See detailYou should never be alone. Social work crossing borders and cultures in child protection and disability rights. Experiences from a current multinational research project.
Limbach-Reich, Arthur UL; Schulze-Kruedener, Joergen

Presentation (2021, May)

Social service providers in the Greater Region report that many children in need of special care and social assistance find themselves in cross-border situations. The legal regulations and practices for ... [more ▼]

Social service providers in the Greater Region report that many children in need of special care and social assistance find themselves in cross-border situations. The legal regulations and practices for the care of children and adolescents can vary considerably from country to country. This can cause delays, breaks or deterioration in the quality of support and sometimes irreversibly worsen the child's situation. Depending on the situation, diagnoses and access to social, medical-social or legal services can change considerably. The EURQUA project deals with cross-border child protection and disability rights within a multinational perspective. [less ▲]

Detailed reference viewed: 70 (3 UL)
Full Text
Peer Reviewed
See detailModelling of mineral construction and demolition waste dynamics through a combination of geospatial and image analysis
Bogoviku, Lorenc; Waldmann, Daniele UL

in Journal of Environmental Management (2021), 282

As the construction sector is shifting towards circular economy models, the role of mineral construction materials as main waste fraction in terms of volumes is crucial. A characterization of this mineral ... [more ▼]

As the construction sector is shifting towards circular economy models, the role of mineral construction materials as main waste fraction in terms of volumes is crucial. A characterization of this mineral stock, as well as the waste derived from it is decisive in ensuring the application of the best practices of circular economy. This paper describes a methodology for assessing the mineral building stock through a combination of geospatial and image analysis. By analysing old topographic maps, buildings are grouped according to their building age into different typologies and based on these maps the construction and demolition activity is evaluated. The mineral stock is assessed and estimations of the mineral construction and demolition waste (CDW) is generated for different stochastic scenarios. This methodology is applied exemplarily on the country of Luxembourg. It was found that the total mineral construction stock for Luxembourg is 276.75 Mt and has been growing at a rate of 20.81% to 24.39% in the last 30 years. Furthermore, the study identified a mean age of the urban building stock of about 60 years and a typical maximum building lifetime of 122 years. Based on the stochastic projections the mineral CDW generated from the existing building stock is expected to be up to 226.9 Mt by 2100, while if future building scenarios are considered, it can be as high as 885.3 Mt. The annual CDW production is expected to be sufficient for a viable concrete recycling activity if regulations on the waste volume flows are made available. [less ▲]

Detailed reference viewed: 14 (2 UL)
Full Text
Peer Reviewed
See detailInternal and international parental migration and the living conditions of children in Ghana
Cebotari, Victor UL; Dito, Bilisuma

in Children and Youth Services Review (2021), 121(February), 105821

Relatively little is known about the effects of parental migration on the living conditions of children who stay behind. Using survey data collected in 2010 from Ghanaian school children (11–18 years; N ... [more ▼]

Relatively little is known about the effects of parental migration on the living conditions of children who stay behind. Using survey data collected in 2010 from Ghanaian school children (11–18 years; N = 2100), this study investigates variations in children’s durable goods and private utilities when parents migrate internally or internationally compared to a control group of children who live with their parents. The study also investigates whether the effects are contingent upon the marital situation of the parents. The findings show that parental migration is not associated with poorer living conditions for Ghanaian children. Rather, specific factors, such as parental divorce, internal migration and the gender of the child, influence whether children experience a decline in their living conditions when parents migrate. [less ▲]

Detailed reference viewed: 47 (1 UL)
Full Text
Peer Reviewed
See detailMood-induced changes in the cortical processing of food images in bulimia nervosa
Lutz, Annika UL; Dierolf, Angelika; van Dyck, Zoé UL et al

in Addictive Behaviors (2021), 113

Background Negative mood often triggers binge eating in bulimia nervosa (BN). We investigated motivational salience as a possible underlying mechanism using event-related potentials (ERPs) as indicators ... [more ▼]

Background Negative mood often triggers binge eating in bulimia nervosa (BN). We investigated motivational salience as a possible underlying mechanism using event-related potentials (ERPs) as indicators of motivated attention allocation (P300) and sustained processing (LPP). Methods We collected ERPs (P300: 350–400 ms; LPP: 600–1000 ms) from 21 women with full-syndrome or partially remitted BN and 21 healthy women (HC), matched for age and body mass index. Idiosyncratic negative and neutral situations were used to induce corresponding mood states (counterbalanced), before participants viewed images of high- and low-calorie foods and neutral objects, and provided ratings for pleasantness and desire to eat. Results P300 was larger for foods than objects; LPP was largest for high-calorie foods, followed by low-calorie foods, then objects. The BN group showed an increased desire to eat high-calorie foods under negative mood and stronger mood induction effects on ERPs than the HC group, with generally reduced P300 and a small increase in LPP for high-calorie foods. Effects were limited to circumscribed electrode positions. Exploratory analyses showed clearer effects when comparing high vs. low emotional eaters. Conclusion We argue that negative mood decreased the availability of cognitive resources (decreased P300) in BN, thereby facilitating disinhibition and food cravings (increased desire-to-eat ratings). Increased sustained processing might be linked to emotional eating tendencies rather than BN pathology per se, and reflect approach motivation, conflict, or regulatory processes. Negative mood appears to induce complex changes in food image processing, whose understanding may contribute to the development of tailored interventions in the future. [less ▲]

Detailed reference viewed: 93 (4 UL)
Full Text
Peer Reviewed
See detailAn MDE Method for Improving Deep Learning Dataset Requiements Engineering using Alloy and UML
Ries, Benoit UL; Guelfi, Nicolas UL; Jahic, Benjamin UL

in Proceedings of the 9th International Conference on Model-Driven Engineering and Software Development (2021, February)

Since the emergence of deep learning (DL) a decade ago, only few software engineering development methods have been defined for systems based on this machine learning approach. Moreover, rare are the DL ... [more ▼]

Since the emergence of deep learning (DL) a decade ago, only few software engineering development methods have been defined for systems based on this machine learning approach. Moreover, rare are the DL approaches addressing specifically requirements engineering. In this paper, we define a model-driven engineering (MDE) method based on traditional requirements engineering to improve datasets requirements engineering. Our MDE method is composed of a process supported by tools to aid customers and analysts in eliciting, specifying and validating dataset structural requirements for DL-based systems. Our model driven engineering approach uses the UML semi-formal modeling language for the analysis of datasets structural requirements, and the Alloy formal language for the requirements model execution based on our informal translational semantics. The model executions results are then presented to the customer for improving the dataset validation activity. Our approach aims at validating DL-based dataset structural requirements by modeling and instantiating their datatypes. We illustrate our approach with a case study on the requirements engineering of the structure of a dataset for classification of five-segments digits images. [less ▲]

Detailed reference viewed: 50 (5 UL)
Peer Reviewed
See detailDiagnostik von Lernstörungen im luxemburgischen Grundschulsystem
Fischer, Jessica UL; Pit-Ten Cate, Ineke UL

in Ugen, Sonja; Schiltz, Christine; Fischbach, Antoine (Eds.) et al Lernstörungen im multilingualen Kontext: Diagnose und Hilfestellungen (2021)

Detailed reference viewed: 82 (2 UL)
Peer Reviewed
See detailDifferenzialdiagnose und weiter Aspekte
Wollschläger, Rachel UL; Muller, Claire UL; Pit-Ten Cate, Ineke UL

in Ugen, Sonja; Schiltz, Christine; Fischbach, Antoine (Eds.) et al Lernstörungen im multilingualen Kontext: Diagnose und Hilfestellungen (2021)

Detailed reference viewed: 80 (0 UL)
Peer Reviewed
See detailFallbeispiele
Fischer, Jessica UL; Pit-Ten Cate, Ineke UL

in Ugen, Sonja; Schiltz, Christine; Fischbach, Antoine (Eds.) et al Lernstörungen im multilingualen Kontext: Diagnose und Hilfestellungen (2021)

Detailed reference viewed: 75 (0 UL)
See detailEinleitung: Lernstörungen im multilingualen Kontext – Eine Herausforderung
Ugen, Sonja UL; Schiltz, Christine UL; Fischbach, Antoine UL et al

in Ugen, Sonja; Schiltz, Christine; Fischbach, Antoine (Eds.) et al Lernstörungen im multilingualen Kontext: Diagnose und Hilfestellungen (2021)

Detailed reference viewed: 80 (2 UL)
Full Text
Peer Reviewed
See detailEstimating worldwide effects of non‐pharmaceutical interventions on COVID‐19 incidence and population mobility patterns using a multiple‐event study
Askitas, Nikolaos; Tatsiramos, Konstantinos UL; Verheyden, Bertrand

in Scientific Reports (2021), 11(1972 (2021)), 1-13

Various non‐pharmaceutical interventions were adopted by countries worldwide in the fight against the COVID‐19 pandemic with adverse socioeconomic side effects, which raises the question about their ... [more ▼]

Various non‐pharmaceutical interventions were adopted by countries worldwide in the fight against the COVID‐19 pandemic with adverse socioeconomic side effects, which raises the question about their differential effectiveness. We estimate the average dynamic effect of each intervention on the incidence of COVID‐19 and on people’s whereabouts by developing a statistical model that accounts for the contemporaneous adoption of multiple interventions. Using daily data from 175 countries, we show that, even after controlling for other concurrent lockdown policies, cancelling public events, imposing restrictions on private gatherings and closing schools and workplaces had significant effects on reducing COVID‐19 infections. Restrictions on internal movement and public transport had no effects because the aforementioned policies, imposed earlier on average, had already de facto reduced human mobility. International travel restrictions, although imposed early, had a short‐lived effect failing to prevent the epidemic from turning into a pandemic because they were less stringent. We interpret the impact of each intervention on containing the pandemic using a conceptual framework which relies on their effects on human mobility behaviors in a manner consistent with time‐use and epidemiological factors. [less ▲]

Detailed reference viewed: 5 (0 UL)
Full Text
Peer Reviewed
See detailOn Hybrid-ARQ-Based Intelligent Reflecting Surface-Assisted Communication System
Ai, Yun; Mohamed, M.; Kong, Long UL et al

in Electronics Letters (2021)

The intelligent reflecting surface (IRS) is an emerging technique to extend wireless coverage. In this letter, the performance of the hybrid automatic repeat request (hybrid ARQ) for an IRS‐assisted ... [more ▼]

The intelligent reflecting surface (IRS) is an emerging technique to extend wireless coverage. In this letter, the performance of the hybrid automatic repeat request (hybrid ARQ) for an IRS‐assisted system is analysed. More specifically, the outage performance of the IRS‐aided system using hybrid ARQ protocol with chase combining is studied. The asymptotic analysis also shows that the outage performance is better and improves linearly by increasing the number of reflectors of the IRS‐aided system. The results also verify the potential of combining the ARQ scheme in the link layer of the IRS‐aided system and demonstrate that a very small change of path loss condition can impact the performance largely. [less ▲]

Detailed reference viewed: 5 (0 UL)
Full Text
See detailDevelopment of New Concrete Mixes from Recycled Aggregates from known resources
Chewe, Ngapeya; Waldmann, Daniele UL

Presentation (2021, January 20)

Detailed reference viewed: 17 (0 UL)
Full Text
Peer Reviewed
See detailCompletion Time Minimization in NOMA Systems:Learning for Combinatorial Optimization
Wang, Anyue UL; Lei, Lei UL; Lagunas, Eva UL et al

in IEEE Networking Letters (2021)

In this letter, we study a completion-time minimization problem by jointly optimizing time slots (TSs) and power allocation for time-critical non-orthogonal multiple access (NOMA) systems. The original ... [more ▼]

In this letter, we study a completion-time minimization problem by jointly optimizing time slots (TSs) and power allocation for time-critical non-orthogonal multiple access (NOMA) systems. The original problem is non-linear/non-convex with discrete variables, leading to high computational complexity in conventional iterative methods. Towards an efficient solution, we train deep neural networks to perform fast and high-accuracy predictions to tackle the difficult combinatorial parts, i.e., determining the minimum consumed TSs and user-TS allocation. Based on the learning-based predictions, we develop a low-complexity post-process procedure to provide feasible power allocation. The numerical results demonstrate promising improvements of the proposed scheme compared to other baseline schemes in terms of computational efficiency, approximating optimum, and feasibility guarantee. [less ▲]

Detailed reference viewed: 9 (1 UL)