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See detailLehren und Lernen auf Distanz – Impulse für digitale Unterrichtsentwicklung in Luxemburg
Baumann, Isabell Eva UL; Harion, Dominic UL

in Bildungsbericht für Luxemburg 2021 (in press)

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See detailApplications of convex analysis within mathematics
Aragón Artacho, Francisco Javier UL; Borwein, J. M.; Martín-Márquez, V. et al

in Mathematical Programming (in press)

In this paper, we study convex analysis and its theoretical applications. We first apply important tools of convex analysis to Optimization and to Analysis. We then show various deep applications of ... [more ▼]

In this paper, we study convex analysis and its theoretical applications. We first apply important tools of convex analysis to Optimization and to Analysis. We then show various deep applications of convex analysis and especially infimal convolution in Monotone Operator Theory. Among other things, we recapture the Minty surjectivity theorem in Hilbert space, and present a new proof of the sum theorem in reflexive spaces. More technically, we also discuss autoconjugate representers for maximally monotone operators. Finally, we consider various other applications in mathematical analysis. [less ▲]

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See detailMaking Elections Work: Accountability with Selection and Control
Anesi, Vincent UL; Buisseret, Peter

in American Economic Journal. Microeconomics (in press)

We study the limits of dynamic electoral accountability when voters are uncertain about politicians’ characteristics (adverse selection) and their actions (moral hazard). Existing work argues that voters ... [more ▼]

We study the limits of dynamic electoral accountability when voters are uncertain about politicians’ characteristics (adverse selection) and their actions (moral hazard). Existing work argues that voters cannot achieve their first-best payoff. This is attributed to inherent deficiencies of the electoral contract, including voters’ inability to pre-commit, and the restriction to a binary retention-replacement decision. We provide conditions under which, despite these constraints, voters can obtain arbitrarily close to the first-best payoff in an equilibrium of the electoral interaction. Our paper resolves that there need not be a trade-off between selection and control. [less ▲]

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See detailEnseignement et apprentissage à distance. Pistes de développement pour une culture numérique au Luxembourg
Baumann, Isabell Eva UL; Harion, Dominic UL

in Rapport sur l‘éducation Luxembourg 2021 (in press)

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See detailFinancial performance and safety in the aviation industry
Farnia, Pedram; Kaspereit, Thomas UL; Walker, Thomas et al

in International Journal of Managerial Finance (in press)

This paper investigates whether financial factors, which are presumed to influence an airline's maintenance, purchasing, and training policies, are associated with the air carrier's safety performance.

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See detailSISTA: Learning Optimal Transport Costs under Sparsity Constraints
Dupuy, Arnaud UL; Carlier, Guillaume; Galichon, Alfred et al

in Communications on Pure and Applied Mathematics (in press)

In this paper, we describe a novel iterative procedure called SISTA to learn the underlying cost in optimal transport problems. SISTA is a hybrid between two classical methods, coordinate descent (“S” ... [more ▼]

In this paper, we describe a novel iterative procedure called SISTA to learn the underlying cost in optimal transport problems. SISTA is a hybrid between two classical methods, coordinate descent (“S”-inkhorn) and proximal gradient descent (“ISTA”). It alternates between a phase of exact minimization over the transport potentials and a phase of proximal gradient descent over the parameters of the transport cost. We prove that this method converges linearly, and we illustrate on simulated examples that it is significantly faster than both coordinate descent and ISTA. We apply it to estimating a model of migration, which predicts the flow of migrants using country-specific characteristics and pairwise measures of dissimilarity between countries. This application demonstrates the effectiveness of machine learning in quantitative social sciences. [less ▲]

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See detailDifferential graded Lie groups and their differential graded Lie algebras
Jubin, Benoît; Kotov, Alexei; Poncin, Norbert UL et al

in Transformation Groups (in press)

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See detailBending laminations on convex hulls of anti-de Sitter quasicircles
merlin, louis; Schlenker, Jean-Marc UL

in Proceedings of the London Mathematical Society (in press)

Let λ− and λ+ be two bounded measured laminations on the hyperbolic disk H2, which "strongly fill" (definition below). We consider the left earthquakes along λ− and λ+, considered as maps from the ... [more ▼]

Let λ− and λ+ be two bounded measured laminations on the hyperbolic disk H2, which "strongly fill" (definition below). We consider the left earthquakes along λ− and λ+, considered as maps from the universal Teichmüller space T to itself, and we prove that the composition of those left earthquakes has a fixed point. The proof uses anti-de Sitter geometry. Given a quasi-symmetric homeomorphism u:RP1→RP1, the boundary of the convex hull in AdS3 of its graph in RP1×RP1≃∂AdS3 is the disjoint union of two embedded copies of the hyperbolic plane, pleated along measured geodesic laminations. Our main result is that any pair of bounded measured laminations that "strongly fill" can be obtained in this manner. [less ▲]

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See detailA Polynomial Time Subsumption Algorithm for Nominal Safe $ELO_{\bot}$ under Rational Closure
Casini, Giovanni UL; Straccia, Umberto; Meyer, Thomas

in Information Sciences (in press)

Description Logics (DLs) under Rational Closure (RC) is a well-known framework for non-monotonic reasoning in DLs. In this paper, we address the concept subsumption decision problem under RC for nominal ... [more ▼]

Description Logics (DLs) under Rational Closure (RC) is a well-known framework for non-monotonic reasoning in DLs. In this paper, we address the concept subsumption decision problem under RC for nominal safe $ELO_{\bot}$, a notable and practically important DL representative of the OWL 2 profile OWL 2 EL. Our contribution here is to define a polynomial time subsumption procedure for nominal safe $ELO_{\bot}$ under RC that relies entirely on a series of classical, monotonic $EL_{\bot}$ subsumption tests. Therefore, any existing classical monotonic $EL_{\bot}$ reasoner can be used as a black box to implement our method. We then also adapt the method to one of the known extensions of RC for DLs, namely Defeasible Inheritance-based DLs without losing the computational tractability. [less ▲]

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See detailHow some bankers made a million by trading just two securities?
Rinne, Kalle UL; Suominen, Matti UL

in Journal of Empirical Finance (in press)

We study a pair trading strategy that utilizes short-term return reversals in the stock market. Using U.S. data, we show that returns to our pair trading strategy exceed reasonable estimates for ... [more ▼]

We study a pair trading strategy that utilizes short-term return reversals in the stock market. Using U.S. data, we show that returns to our pair trading strategy exceed reasonable estimates for transaction costs. The strategy also generates positive alpha when controlling for the standard risk factors. Second, using transaction level data from Finland, focusing on a popular pair, we provide evidence that these kinds of pair trading returns are compensation from providing liquidity. On the days when the expected returns to our pair trading strategy are the highest, the trading volume is abnormally high and, judging from active brokers’ net trades, nearly 45% of all brokers (or their customers) engage in pair trading in accordance with our trading strategy. These brokers are mainly counterparties to few brokers that trade large quantities of stocks inconsistent with our strategy. [less ▲]

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See detailThe Dark Side of Digital Financial Transformation: The New Risks of FinTech and the Rise of TechRisk
Zetzsche, Dirk Andreas UL; Arner, Douglas; Buckley, Ross

in Singapore Journal of Legal Studies (in press)

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See detailA Meta-Analysis of Viewing Time Measures of Sexual Interest in Children
Schmidt, Alexander F. UL; Babchishin, Kelly M.; Lehmann, Robert J. B.

in Archives of Sexual Behavior (in press)

Due to unobtrusiveness and ease of implementation, viewing time (VT) measures of sexual interest in children have sparked increasing research interest in forensic contexts over the last two decades. The ... [more ▼]

Due to unobtrusiveness and ease of implementation, viewing time (VT) measures of sexual interest in children have sparked increasing research interest in forensic contexts over the last two decades. The current study presents two meta-analyses of VT measures adapted to assess pedophilic interest to determine their discrimination between sexual offenders against children (SOC) and non-SOC groups as well as convergent validity (associations with other measures of sexual interest in children). On average, VT measures showed moderate discrimination between criterion groups (fixed-effect d = 0.60, 95% CI [0.51, 0.68], N = 2,705, k = 14) and significant convergent validity with self-reports, penile plethysmography, Implicit Association Tests and offence behavioral measures ranging from r =.18 to r = .38. VT measures, however, provided better discrimination for adults (fixed-effect d = 0.78, 95% CI [0.64, 0.92]) than adolescent samples (fixed-effect d = 0.50, 95% CI [0.40, 0.61]), Qbetween = 9.37, p = .002. Moreover, using pedophilic difference scores within adult samples substantially increased VT measures’ validity (fixed-effect d = 1.03, 95% CI [0.82, 1.25], N = 414, k = 7). Results are discussed in terms of their theoretical and applied implications for forensic contexts. [less ▲]

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See detailThe Role of Teachers in Students’ Social Inclusion in the Classroom
Gasser, Luciano; Cillessen, Antonius H.N.; Huber, Christian et al

in Frontiers in Education (in press)

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See detailAttitudes towards Multiculturalism in Luxembourg: Measurement Invariance and Factor Structure of the Multicultural Ideology Scale
Stogianni, Maria UL; Murdock, Elke UL; He, Jia et al

in International Journal of Intercultural Relations (in press)

In the present study, we examined the dimensionality and the measurement invariance of the Multicultural Ideology Scale (MCI), and mean differences across different cultural groups within the multilingual ... [more ▼]

In the present study, we examined the dimensionality and the measurement invariance of the Multicultural Ideology Scale (MCI), and mean differences across different cultural groups within the multilingual, multicultural context of Luxembourg. Luxembourg is a unique context to study attitudes towards diversity because 47.4% of the citizens are non-nationals (i.e. economic migrants, sojourners, refugees) and minority and majority are increasingly difficult to define. Our sample included 1,488 participants from diverse ethnic backgrounds who completed the survey in German, French or English. In contrast to previous findings, our analyses on responses to the MCI scale produced a two-dimensional structure, distinguishing between positive and negative attitudes towards multiculturalism. The factor structure was partially invariant across ethnocultural groups: Configural and metric invariance were established across natives and non-natives and different language versions. Scalar invariance was only established across gender groups. Natives and male participants reported the most negative attitudes towards multiculturalism. We discuss the importance of assessing measurement invariance and provide recommendations to improve the assessment of psychological multiculturalism. [less ▲]

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See detailA remark on Schröder's equation: Formal and analytic linearization of iterative roots of the power series f(z)=z
Reich, Ludwig; Tomaschek, Jörg UL

in Monatshefte für Mathematik (in press)

We study Schröder’s equation (i.e. the problem of linearization) for local analytic functions F with F (0)=0, F(0)=1, F(0) a root of 1. While Schröder’s equation in this case need not have even a formal ... [more ▼]

We study Schröder’s equation (i.e. the problem of linearization) for local analytic functions F with F (0)=0, F(0)=1, F(0) a root of 1. While Schröder’s equation in this case need not have even a formal solution, we show that if F is formally linearizable, then it can also be linearized by an invertible local analytic transformation. On the other hand, there exist also divergent series solutions of Schröder’s equation in this situation. We give some applications of our results to iterative functional equations, functional-differential equations and iteration groups. [less ▲]

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See detailNitsche’s method for two and three dimensional NURBS patch coupling
Nguyen, Vinh-Phu; Kerfriden, Pierre; Brino, Marco et al

in Computational Mechanics (in press)

We present a Nitche’s method to couple non-conforming two and three-dimensional NURBS (Non Uniform Rational B-splines) patches in the context of isogeometric analysis (IGA). We present results for linear ... [more ▼]

We present a Nitche’s method to couple non-conforming two and three-dimensional NURBS (Non Uniform Rational B-splines) patches in the context of isogeometric analysis (IGA). We present results for linear elastostatics in two and and three-dimensions. The method can deal with surface-surface or volume-volume coupling, and we show how it can be used to handle heterogeneities such as inclusions. We also present preliminary results on modal analysis. This simple coupling method has the potential to increase the applicability of NURBS-based isogeometric analysis for practical applications. [less ▲]

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See detailSustainability, FinTech and Financial Inclusion
Zetzsche, Dirk Andreas UL; Veidt, Robin UL; Buckley, Ross et al

in European Business Organization Law Review (in press)

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See detailA Note on the Estimation of Job Amenities and Labor Productivity
Dupuy, Arnaud UL; Galichon, Alfred

in Quantitative Economics (in press)

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See detailExpediting in Two-Echelon Spare Parts Inventory Systems
Drent, Melvin UL; Arts, Joachim UL

in Manufacturing and Service Operations Management (in press)

We consider a two-echelon spare parts inventory system consisting of one central warehouse and multiple local warehouses. Each warehouse keeps multiple types of repairable parts to maintain several types ... [more ▼]

We consider a two-echelon spare parts inventory system consisting of one central warehouse and multiple local warehouses. Each warehouse keeps multiple types of repairable parts to maintain several types of capital goods. The local warehouses face Poisson demand and are replenished by the central warehouse. We assume that unsatisfied demand is backordered at all warehouses. Furthermore, we assume deterministic lead times for the replenishments of the local warehouses. The repair shop at the central warehouse has two repair options for each repairable part: a regular repair option and an expedited repair option. Both repair options have stochastic lead times. Irrespective of the repair option, each repairable part uses a certain resource for its repair. Assuming a dual-index policy at the central warehouse and base stock control at the local warehouses, an exact and efficient evaluation procedure for a given control policy is formulated. To find an optimal control policy, we look at the minimization of total investment costs under constraints on both the aggregate mean number of backorders per capital good type and the aggregate mean fraction of repairs that are expedited per repair resource. For this non-linear non-convex integer programming problem, we develop a greedy heuristic and an algorithm based on decomposition and column generation. Both solution approaches perform very well with average optimality gaps of 1.56 and 0.23 percent, respectively, across a large test bed of industrial size. Based on a case study at Netherlands Railways, we show how managers can significantly reduce the investment in repairable spare parts when dynamic repair policies are leveraged to prioritize repair of parts whose inventory is critically low. [less ▲]

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See detailMarital Patterns and Income Inequality
Dupuy, Arnaud UL; Weber, Simon

in Economica (in press)

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See detailDiversifizierung von Kindertagesbetreuungsangeboten durch mixed economy of care: Eine vergleichende Perspektive aus Luxemburg und Deutschland.
Schmitz, Anett UL; Wiltzius, Martine UL; Mierendorff, Johanna

in Zeitschrift für Soziologie der Erziehung und Sozialisation = Journal for Sociology of Education and Socialization (in press)

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See detailValues-Based Territorial Food Networks (VTFN): An overarching concept representing the diverse perspectives of sustainable and ethical transitions of Alternative Food Networks – be they Local Food Systems, Civic Food Networks or Short Food Supply Chains
Reckinger, Rachel UL

in Sociologia Ruralis (in press)

This article proposes a comparative literature review of the concepts Local Food Systems (LFS), Short Food Supply Chains (SFSC), Civic Food Networks (CFN) and Alternative Food Networks (AFN) – converging ... [more ▼]

This article proposes a comparative literature review of the concepts Local Food Systems (LFS), Short Food Supply Chains (SFSC), Civic Food Networks (CFN) and Alternative Food Networks (AFN) – converging into the umbrella-term Values-Based Territorial Food Networks (VTFN). Based on the analysis of the specificities and shortcomings in the four concepts, VTFN aims to enhance conceptual clarity. The current coexistence of the concepts conceals their structural and systemic commonalities – relevant for understanding pathways to ethical and sustainable food system transformations. Taking a closer look at unsolved issues and ambiguities of AFNs (subdivided into LFS, SFSC and CFNs), VTFN offers a more overarching, and pragmatic, concept. It qualifies the claimed ‘alternativeness’ of AFNs affirmatively through the dimensions of social, economic, environmental and governance ‘sustainability values’ and through varying constellations of ‘territoriality’. Thus, it fosters integrated scientific dialogue about a conceptual determination of emerging networks of food system transitions worldwide. [less ▲]

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See detailCombining Genetic Programming and Model Checking to Generate Environment Assumptions
Gaaloul, Khouloud UL; Menghi, Claudio UL; Nejati, Shiva UL et al

in IEEE Transactions on Software Engineering (in press)

Software verification may yield spurious failures when environment assumptions are not accounted for. Environment assumptions are the expectations that a system or a component makes about its operational ... [more ▼]

Software verification may yield spurious failures when environment assumptions are not accounted for. Environment assumptions are the expectations that a system or a component makes about its operational environment and are often specified in terms of conditions over the inputs of that system or component. In this article, we propose an approach to automatically infer environment assumptions for Cyber-Physical Systems (CPS). Our approach improves the state-of-the-art in three different ways: First, we learn assumptions for complex CPS models involving signal and numeric variables; second, the learned assumptions include arithmetic expressions defined over multiple variables; third, we identify the trade-off between soundness and coverage of environment assumptions and demonstrate the flexibility of our approach in prioritizing either of these criteria. We evaluate our approach using a public domain benchmark of CPS models from Lockheed Martin and a component of a satellite control system from LuxSpace, a satellite system provider. The results show that our approach outperforms state-of-the-art techniques on learning assumptions for CPS models, and further, when applied to our industrial CPS model, our approach is able to learn assumptions that are sufficiently close to the assumptions manually developed by engineers to be of practical value. [less ▲]

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See detailConcentration bounds for geometric Poisson functionals: logarithmic Sobolev inequalities revisited
Peccati, Giovanni UL; Bachmann, Sascha

in Electronic Journal of Probability (in press)

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See detailOn the comprehensibility and perceived privacy protection of indirect questioning techniques
Hoffmann, Adrian; Waubert de Puiseau, Berenike; Schmidt, Alexander F. UL et al

in Behavior Research Methods (in press)

On surveys that assess sensitive personal attributes, indirect questioning aims at increasing respondents’ willingness to answer truthfully by protecting confidentiality. However, the assumption that ... [more ▼]

On surveys that assess sensitive personal attributes, indirect questioning aims at increasing respondents’ willingness to answer truthfully by protecting confidentiality. However, the assumption that subjects understand questioning procedures fully and trust them to protect their privacy is tested rarely. In a scenario-based design, we compared four indirect questioning procedures in terms of comprehensibility and perceived privacy protection. All indirect questioning techniques were found less comprehensible for respondents than a conventional direct question used for comparison. Less-educated respondents experienced more difficulties when confronted with any indirect questioning technique. Regardless of education, the Crosswise Model was found most comprehensible among the four indirect methods. Indirect questioning was perceived to increase privacy protection in comparison to a direct question. Unexpectedly, comprehension and perceived privacy protection did not correlate. We recommend assessing these factors separately in future evaluations of indirect questioning. [less ▲]

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See detailSupporting DNN Safety Analysis and Retraining through Heatmap-based Unsupervised Learning
Fahmy, Hazem UL; Pastore, Fabrizio UL; Bagherzadeh, Mojtaba et al

in IEEE Transactions on Reliability (in press)

Deep neural networks (DNNs) are increasingly im- portant in safety-critical systems, for example in their perception layer to analyze images. Unfortunately, there is a lack of methods to ensure the ... [more ▼]

Deep neural networks (DNNs) are increasingly im- portant in safety-critical systems, for example in their perception layer to analyze images. Unfortunately, there is a lack of methods to ensure the functional safety of DNN-based components. We observe three major challenges with existing practices regarding DNNs in safety-critical systems: (1) scenarios that are underrepresented in the test set may lead to serious safety violation risks, but may, however, remain unnoticed; (2) char- acterizing such high-risk scenarios is critical for safety analysis; (3) retraining DNNs to address these risks is poorly supported when causes of violations are difficult to determine. To address these problems in the context of DNNs analyzing images, we propose HUDD, an approach that automatically supports the identification of root causes for DNN errors. HUDD identifies root causes by applying a clustering algorithm to heatmaps capturing the relevance of every DNN neuron on the DNN outcome. Also, HUDD retrains DNNs with images that are automatically selected based on their relatedness to the identified image clusters. We evaluated HUDD with DNNs from the automotive domain. HUDD was able to identify all the distinct root causes of DNN errors, thus supporting safety analysis. Also, our retraining approach has shown to be more effective at improving DNN accuracy than existing approaches. [less ▲]

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See detailArts vs Engineering: Choosing Consumption of and Investment in Education
Tampieri, Alessandro UL; Romano, Richard

in Research in Economics (in press)

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See detailPermanent investment courts and the EU legal order
Neframi, Eleftheria UL

in European Yearbook of International Economic Law (in press)

In the external action of the Union, the establishment of permanent investment courts is not only part of the common commercial policy, but also an expression of the objective to promote the rule of law ... [more ▼]

In the external action of the Union, the establishment of permanent investment courts is not only part of the common commercial policy, but also an expression of the objective to promote the rule of law and to act as an influential actor in international procedural law. Through its participation in agreements establishing a bilateral investment court system (ICS) and in the negotiation of the convention establishing a Multilateral Investment Court (MIC), the Union aims to promote its own standards of judicial protection while preserving the constitutional framework at the basis of the principle of autonomy. The present paper deals with the question of division of competences, especially in the context of the establishment of a MIC and in the allocation of international responsibility in Investor-State Dispute Settlement (ISDS) mechanisms. Moreover, it discusses the scope of fundamental principles of the EU legal order through the position of the Court of Justice in Opinion 1/17 and the analysis of the compatibility of the ICS with primary EU law. While the principles of conferral and of the autonomy of the EU legal order impose constraints to the external action of the Union, their scope is at the same time interpreted in a way to accommodate their guarantee with the EU’s objective to contribute to the major reform of the ISDS. In that way, the guarantee of the EU legal order’s constitutional requirements is not necessarily a limit to the efficiency of the Union’s external action [less ▲]

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See detailRegional foreign banks and financial inclusion: Evidence from Africa
Leon, Florian UL; Zins, Alexandra

in Economic Modelling (in press)

Regional foreign banks expanded quickly over the past decade in developing and emerging countries and have a growing influence in banking systems. We question whether the development of African regional ... [more ▼]

Regional foreign banks expanded quickly over the past decade in developing and emerging countries and have a growing influence in banking systems. We question whether the development of African regional foreign banks, also called Pan-African banks, influences financial inclusion of firms and households. To this end, we combine the World Bank Global Findex database and the World Bank Enterprise Surveys with a hand-collected database on the presence of regional foreign banks. We find that Pan-African banks presence increases firms’ access to credit and limited evidence that they favor financial access of the middle class by restoring confidence in banks. We suggest that this impact is related to the adoption of an aggressive strategy aiming at gaining market shares rather than through the exploitation of informational and technological advantages. [less ▲]

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See detailFostering experimental and computational synergy to modulate hyperinflammation
Del Sol Mesa, Antonio UL

in Trends in Immunology (in press)

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See detailStudents' immigration background as a moderator of predictive validity of tracking decisions.
Klapproth, Florian UL; Schaltz, Paule UL

in Procedia Social and Behavioral Sciences (in press)

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See detailHigh-performance modeling of concrete ageing
Habera, Michal UL; Zilian, Andreas UL

in Proceedings in Applied Mathematics and Mechanics (in press)

Long-term behaviour of concrete structural elements is very important for evaluation of its health and serviceability range. The phenomena that must be considered are complex and lead to coupled ... [more ▼]

Long-term behaviour of concrete structural elements is very important for evaluation of its health and serviceability range. The phenomena that must be considered are complex and lead to coupled multiphysics formulations. Such formulations are difficult not only from physical perspective, but also from computational perspective. In this contribution attention to computational efficiency and effective implementation is payed. Presented model for concrete ageing is based on microprestress-solidification (MPS) theory of Bazant [1], Kunzel’s model for heat and moisture transport [2] and Mazars model for damage [3]. Ageing linear viscoelastic response, which is immanent to MPS theory and concrete creep, leads to ordinary differetial equation for internal variables solved for every quadrature/nodal point. Numerical structure of the finite element discretisation is examined. Few simplifications on physical model lead to a very efficient linear algebra problem for which standard preconditioned Krylov solvers are reviewed. In parallel, weak and strong scaling tests are performed. All results are produced within open-source finite element framework FEniCS [4]. These models are usually a basis for more involved thermo-hygro-chemo-mechanical (THCM) models with migrating chemical species. It is anticipated, that presented results will help practitioners or other structural engineerers with the choice of suitable and efficient methods for long-term concrete modeling. [less ▲]

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See detailNetwork Identifiability from Intrinsic Noise
Goncalves, Jorge UL; Hayden, David; Yuan, Ye

in IEEE Transactions on Automatic Control (in press)

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See detailBook review: Bessey, Valérie et Werner Paravicini: Guerre des manifestes : Charles le Téméraire et ses ennemis (1465-1475)
Genot, Gilles UL

in Hemecht: Zeitschrift für Luxemburger Geschichte (in press)

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See detailJoint Precoding and On-Board Beamforming for Multiple gateway Multibeam Satellite Systems
Joroughi, Vahid UL

in Submitted to IEEE Journal on Selected topic in Communication (JSAC) (in press)

This paper aims to design joint precoding and onboard beamforming of a multiple gateway multibeam satellite system, either in a hybrid space-ground mode, or in a totally on-board one. In such an ... [more ▼]

This paper aims to design joint precoding and onboard beamforming of a multiple gateway multibeam satellite system, either in a hybrid space-ground mode, or in a totally on-board one. In such an architecture, with employing high throughput full frequency reuse pattern over both user and feeder links, each gateway serves a cluster of adjacent beams such that the adjacent clusters are served through a set of gateways that are located at different geographical areas. However, such a system brings in two challenges to overcome. First, the interference in both user and feeder links is the bottleneck of the whole system and applying interference mitigation techniques becomes necessary. Second, as the data demand increases, the ground and space segments should employ extensive bandwidth resources in the feeder link accordingly. This entails embedding an extra number of gateways aiming to support a fair balance between the increasing demand and the corresponding required feeder link resources. To solve these problems, this study investigates the impact of employing a joint multiple gateway architecture and on-board beamforming scheme. It is shown that by properly designing the on-board beamforming scheme, the number of gateways can be kept affordable even if the data demand increases. Moreover, Zero Forcing (ZF) precoding techniques are considered to cope with the interference in both user and feeder links which embed in the following premises: (i) each gateway constructs a part of block ZF precoding matrix, (ii) the satellite and gateways perform the precoding scheme, and (iii) a joint design of ZF precoding and on-board beamforming at the payload of the satellite so that no signal processing scheme is conceived at the gateways. The provided simulation results depict the performance gain obtained by our proposed schemes. [less ▲]

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See detailUniversity competition and transnational education: the choice of branch campus
Tampieri, Alessandro UL; Poyago-Theotoky, Joanna

in B.E. Journal of Theoretical Economics (in press)

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See detailA theory-driven design framework for smartphone applications to support healthy and sustainable grocery shopping
Blanke, Julia UL; Billieux, Joel; Vögele, Claus UL

in Human Behavior and Emerging Technologies (in press)

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See detailA look into the future of the COVID-19 pandemic in Europe: an expert consultation
Iftekhar, E. N.; Priesemann, V.; Balling, Rudolf UL et al

in The Lancet Regional Health Europe (in press)

How will the coronavirus disease 2019 (COVID-19) pandemic develop in the coming months and years? Based on an expert survey, we examine key aspects that are likely to influence the COVID-19 pandemic in ... [more ▼]

How will the coronavirus disease 2019 (COVID-19) pandemic develop in the coming months and years? Based on an expert survey, we examine key aspects that are likely to influence the COVID-19 pandemic in Europe. The challenges and developments will strongly depend on the progress of national and global vaccination programs, the emergence and spread of variants of concern (VOCs), and public responses to non-pharmaceutical interventions (NPIs). In the short term, many people remain unvaccinated, VOCs continue to emerge and spread, and mobility and population mixing are expected to increase. Therefore, lifting restrictions too much and too early risk another damaging wave. This challenge remains despite the reduced opportunities for transmission given vaccination progress and reduced indoor mixing in summer 2021. In autumn 2021, increased indoor activity might accelerate the spread again, whilst a necessary reintroduction of NPIs might be too slow. The incidence may strongly rise again, possibly filling intensive care units, if vaccination levels are not high enough. A moderate, adaptive level of NPIs will thus remain necessary. These epidemiological aspects combined with economic, social, and health-related consequences provide a more holistic perspective on the future of the COVID-19 pandemic. [less ▲]

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See detailGaussian Random Measures Generated by Berry's Nodal Sets
Peccati, Giovanni UL; Vidotto, Anna

in Journal of Statistical Physics (in press)

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See detailFinite-Time Attitude Synchronization with Distributed Discontinuous Protocols
Wei, Jieqiang; Zhang, Silun; Adaldo, Antonio et al

in IEEE Transactions on Automatic Control (in press)

The finite-time attitude synchronization problem is considered in this paper, where the rotation of each rigid body is expressed using the axis-angle representation. Two discontinuous and distributed ... [more ▼]

The finite-time attitude synchronization problem is considered in this paper, where the rotation of each rigid body is expressed using the axis-angle representation. Two discontinuous and distributed controllers using the vectorized signum function are proposed, which guarantee almost global and local convergence, respectively. Filippov solutions and non-smooth analysis techniques are adopted to handle the discontinuities. Sufficient conditions are provided to guarantee finite-time convergence and boundedness of the solutions. Simulation examples are provided to verify the performances of the control protocols designed in this paper. [less ▲]

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See detailSocietal Emotional Environments and Cross-Cultural Differences in Life Satisfaction: A Forty-Nine Country Study
Krys, Kuba; Yeung, June; Capaldi, Colin et al

in Journal of Positive Psychology (in press)

In this paper, we introduce the concept of ‘societal emotional environment’: the emotional climate of a society (operationalized as the degree to which positive and negative emotions are expressed in a ... [more ▼]

In this paper, we introduce the concept of ‘societal emotional environment’: the emotional climate of a society (operationalized as the degree to which positive and negative emotions are expressed in a society). Using data collected from 12,888 participants across 49 countries, we show how societal emotional environments vary across countries and cultural clusters, and we consider the potential importance of these differences for well-being. Multilevel analyses supported a ‘double-edged sword’ model of negative emotion expression, where expression of negative emotions predicted higher life satisfaction for the expresser but lower life satisfaction for society. In contrast, partial support was found for higher societal life satisfaction in positive societal emotional environments. Our study highlights the potential utility and importance of distinguishing between positive and negative emotion expression, and adopting both individual and societal perspectives in well-being research. Individual pathways to happiness may not necessarily promote the happiness of others. [less ▲]

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See detailA Formal Framework of Software Product Line Analyses
Castro, Thiago; Teixeira, Leopoldo; Alves, Vander et al

in ACM Transactions on Software Engineering and Methodology (in press)

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See detailEuropeans and Americans in Korea, 1882-1910: A Bourgeois and Translocal Community
Dittrich, Klaus UL

in Itinerario (in press), 39(3),

This article deals with the European and American community in Korea between the conclusion of Korea’s first international treaties in the early 1880s and the country’s annexation by the Japanese Empire ... [more ▼]

This article deals with the European and American community in Korea between the conclusion of Korea’s first international treaties in the early 1880s and the country’s annexation by the Japanese Empire in 1910. The article starts out by presenting an overview of the community. Concentrated in Seoul and Chemulp’o, the Anglo-Saxon element dominated a community made up of diplomats, foreign experts in the service of the Korean government, merchants and missionaries. Next, the article describes two key characteristics of the European and American residents in Korea. Firstly, they were individuals defining themselves as bourgeois, or middle-class; secondly, the term “translocality” serves to bring together the multiple layers of border-crossing these individuals were involved in – as long-distance migrants between Europe or Northern America and East Asia, as migrants within the East Asian context, and as representatives of different Euro-American nationalities living together in Korea. [less ▲]

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See detailLettere alla redazione : il caso della “Buona Domenica” lussemburghese Un fenomeno mediatico italo-lussemburghese
Cicotti, Claudio UL

in El Ghibli - Rivista di Letteratura della Migrazione (in press)

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See detailStructural changes in the labor market and the rise of early retirement in France and Germany
Batyra, Anna; de la Croix, David; Pierrard, Olivier et al

in German Economic Review (in press)

The rise of early retirement in Europe is typically attributed to the European system of taxes and transfers. A model with an imperfectly competitive labor market allows us to consider also the effects of ... [more ▼]

The rise of early retirement in Europe is typically attributed to the European system of taxes and transfers. A model with an imperfectly competitive labor market allows us to consider also the effects of bargaining power and of matching efficiency on pre-retirement. We find that lower bargaining power of workers and declining matching efficiency have been important determinants of early retirement in France and Germany. These structural changes, combined with early-retirement transfers and population aging, are also consistent with the employment and unemployment rates, labor share and seniority premia. [less ▲]

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See detailUncertainty-driven symmetry-breaking and stochastic stability in a generic differential game of lobbying
Boucekkine, Raouf; Fabien, Prieur; Ruan, Weihua et al

in Economic Theory (in press)

We study a 2-players stochastic differential game of lobbying. Players invest in lobbying activities to alter the legislation in her own benefit. The payoffs are quadratic and uncertainty is driven by a ... [more ▼]

We study a 2-players stochastic differential game of lobbying. Players invest in lobbying activities to alter the legislation in her own benefit. The payoffs are quadratic and uncertainty is driven by a Wiener process. We consider the Nash symmetric game where players face the same cost and extract symmetric payoffs, and we solve for Markov Perfect Equilibria (MPE) in the class of affine functions. First, we prove a general sufficient (catching up) optimality condition for two-players stochastic games with uncertainty driven by Wiener processes. Second, we prove that the number and nature of MPE depend on the extent of uncertainty (i.e the variance of the Wiener processes). In particular, we prove that while a symmetric MPE always exists, two asymmetric MPE emerge if and only if uncertainty is large enough. Third, we study the stochastic stability of all the equilibria. We notably find, that the state converges to a stationary invariant distribution under asymmetric MPE. Fourth, we study the implications for rent dissipation asymptotically and compare the outcomes of symmetric vs asymmetric MPE in this respect, ultimately enhancing again the role of uncertainty. [less ▲]

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See detailBad representations and homotopy groups of Character Varieties
Guerin, Clément UL; Lawton, Sean; Ramras, Daniel

in Annales Henri Lebesgue (in press)

Let G be a connected, reductive, complex affine algebraic group, and let Xr denote the moduli space of G-valued representations of a rank r free group. We first characterize the singularities in Xr ... [more ▼]

Let G be a connected, reductive, complex affine algebraic group, and let Xr denote the moduli space of G-valued representations of a rank r free group. We first characterize the singularities in Xr resolving conjectures of Florentino-Lawton. In particular, we compute the codimension of the orbifold singular locus using facts about Borel-de Siebenthal groups. We then use this codimension to calculate some higher homotopy groups of the smooth locus of Xr, proving conjectures of Florentino-Lawton-Ramras. Lastly, using the earlier analysis of Borel-de Siebenthal groups, we prove a conjecture of Sikora about CI Lie groups. [less ▲]

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See detailTransnational soldiering, burial and commemoration across borders. The case of Luxembourgers in the French Foreign Legion
Kolnberger, Thomas UL; Kmec, Sonja UL

in Francia: Forschungen zur Westeuropäischen Geschichte. 3, 19./20. Jahrhundert (2022), 49

To whom do the dead belong? The French Foreign Legion exemplifies a modern military conundrum: how to reconcile loyal and patriotic duty with mercenary service or, in neutral terms, military labour. This ... [more ▼]

To whom do the dead belong? The French Foreign Legion exemplifies a modern military conundrum: how to reconcile loyal and patriotic duty with mercenary service or, in neutral terms, military labour. This article investigates soldierly funeral culture in the long nineteenth century, with a focus on the entangled histories of Luxembourg and France. The Foreign Legion’s transnational recruitment makes this armed force a unique case study to explore military commemoration across state borders, honouring the dead and the living alike. Since its establishment to fight outside mainland France, rooted in the conquest of Algeria (1830–1857), the Legion has been the only branch of the French military whose members swear allegiance not to France, but to the corps itself: its motto is Legio Patria Nostra (»The Legion is our Homeland«). As a military parallel society and temporary »ersatz nation«, the Legion has elaborated a specific death cult, which has both a corporeal (body-centred, individual) and a sur-real (transcendent, communal) dimension. The two dimensions cannot be rigidly delimited: they clearly overlap and can be shared with other nations, as the case of Luxembourg demonstrates. [less ▲]

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See detailThe quizzing effect depends on hope of success and can be optimized by cognitive load-based adaptation
Heitmann, Svenja; Grund, Axel UL; Fries, Stefan et al

in Learning and Instruction (2022), 77(online first), 101526

It is well established that quizzing fosters learning. However, some gaps in the literature relating to the fit of quizzing to learner characteristics and learner perceptions during quizzing still need to ... [more ▼]

It is well established that quizzing fosters learning. However, some gaps in the literature relating to the fit of quizzing to learner characteristics and learner perceptions during quizzing still need to be addressed. The present study focuses on two of these aspects: achievement motives and perceptions of cognitive load. First, quizzing entails that learners’ performance is judged against some standard of excellence. This might make it appealing and effective for learners with high hope of success and low fear of failure in particular. Second, it is an open question whether providing quiz questions that are adapted to learners’ perceived level of cognitive load during quizzing would be beneficial. To address these questions, we randomly assigned learners to either non-adaptive quizzing, adaptive quizzing, or note-taking. We found that quizzing benefits concerning learning outcomes were moderated by hope of success. Furthermore, the adaptation via cognitive load ratings substantially increased the quizzing effect. [less ▲]

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See detailSharing calculations to understand arithmetical algorithms and parallel computing
Andrusiak, Rich; Perucca, Antonella UL

in Mathematics Teacher (2022)

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See detailRez.: Rolf G. Renner, "Peter Handke. Erzählwelten – Bilderordnungen"
Kohns, Oliver UL

in Zeitschrift für Germanistik (2022), 32(1), 239-241

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See detailAssessing collaborative problem-solving skills among elementary school students
Rojas, Matias; Nussbaum, Miguel; Chiuminatto, Pablo et al

in Computers and Education (2021), 175

As 21st century skills have become increasingly important, Collaborative Problem Solving (CPS) is now considered essential in almost all areas of life. Different theoretical frameworks and assessment ... [more ▼]

As 21st century skills have become increasingly important, Collaborative Problem Solving (CPS) is now considered essential in almost all areas of life. Different theoretical frameworks and assessment instruments have emerged for measuring this skill. However, more applied studies on its implementation and evaluation in real-life educational settings are required. In this sense, pre-post experimental designs are essential for identifying new methods for developing collaborative problem-solving skills. To do so, equivalent tests are needed to facilitate consistent score interpretations and reduce the practice effect. In the present study, a Design-Based Research approach is used to design and validate an assessment tool with two equivalent forms based on a framework proposed by the OECD and applied to a collaborative activity. A total of 719 students aged between 10 and 13 years old participated in the different stages of the study. The results show that the proposed instrument effectively measures the problem-solving dimension of collaborative problem-solving skills among students of this age. Moreover, the results from the test were equivalent for both forms and across genders. Finally, there were no significant differences when assessing collaborative problem-solving in human-human groups versus human-agent groups using the proposed instrument. For future work, we recommend including other data sources than just text-based conversations. This would allow us to capture the rich social interactions present in this type of activity. Future work should also consider exploring the extent to which skills could be trained. This could be done in an experimental design assessed using the equivalent forms of the proposed instrument as a pre- and post-test. Doing so would provide a more accurate measure of students’ collaborative skills. [less ▲]

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See detailBrownian Loops, Layering Fields and Imaginary Gaussian Multiplicative Chaos
Camia, Federico; Gandolfi, Alberto; Peccati, Giovanni UL et al

in Communications in Mathematical Physics (2021), In press

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See detailPublic Covid-19 X-ray datasets and their impact on model bias - a systematic review of a significant problem
Garcia Santa Cruz, Beatriz UL; Bossa, Matias Nicolas UL; Sölter, Jan UL et al

in Medical Image Analysis (2021), 74

Computer-aided diagnosis and stratification of COVID-19 based on chest X-ray suffers from weak bias assessment and limited quality-control. Undetected bias induced by inappropriate use of datasets, and ... [more ▼]

Computer-aided diagnosis and stratification of COVID-19 based on chest X-ray suffers from weak bias assessment and limited quality-control. Undetected bias induced by inappropriate use of datasets, and improper consideration of confounders prevents the translation of prediction models into clinical practice. By adopting established tools for model evaluation to the task of evaluating datasets, this study provides a systematic appraisal of publicly available COVID-19 chest X-ray datasets, determining their potential use and evaluating potential sources of bias. Only 9 out of more than a hundred identified datasets met at least the criteria for proper assessment of the risk of bias and could be analysed in detail. Remarkably most of the datasets utilised in 201 papers published in peer-reviewed journals, are not among these 9 datasets, thus leading to models with a high risk of bias. This raises concerns about the suitability of such models for clinical use. This systematic review highlights the limited description of datasets employed for modelling and aids researchers to select the most suitable datasets for their task. [less ▲]

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See detailBreast and prostate cancer risk: the interplay of polygenic risk, rare pathogenic germline variants, and family history
Hassanin, Emadeldin; May, Patrick UL; Aldisi, Rana et al

in Genetics in Medicine (2021)

Purpose Investigate to which extent polygenic risk scores (PRS), pathogenic or likely rare pathogenic germline variants (PV), and family history jointly influence breast and prostate cancer risk. Methods ... [more ▼]

Purpose Investigate to which extent polygenic risk scores (PRS), pathogenic or likely rare pathogenic germline variants (PV), and family history jointly influence breast and prostate cancer risk. Methods 200,643 individuals from the UK Biobank were stratified as follows: 1. Heterozygotes or non-heterozygotes of PV in moderate to high cancer risk genes, 2. PRS strata, 3. with or without a family history of cancer. Multivariable logistic regression and Cox proportional hazards models were used to compute the odds ratio (OR) across groups and the cumulative incidence through life. Results Cumulative incidence by age 70 among non-heterozygotes across PRS strata ranged from 9% to 32% and from 9% to 35% for breast and prostate cancer, respectively. Among PV heterozygotes it ranged from 20% to 48% in moderate-risk genes and from 51% to 74% in high-risk genes for breast cancer, and it ranged from 30% to 59% in prostate cancer risk genes. Family history is always associated with an increased cancer OR. Conclusion PRS provides a meaningful risk gradient leading alone to a cancer risk comparable to PV in moderate risk genes while acting as risk modifier for high-risk genes. Including family history beside PV and PRS further improves cancer risk stratification. [less ▲]

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See detailDigital Euro: opportunity or (legal) challenge?
Lupinu, Pier Mario UL

in Ianus: Diritto e Finanza (2021), (22), 27

In the euro area today, there are two ways in which the central bank provides money to its economy. The first consists in the issue of physical banknotes, while the second is expressed through the ... [more ▼]

In the euro area today, there are two ways in which the central bank provides money to its economy. The first consists in the issue of physical banknotes, while the second is expressed through the electronic accreditation of deposits on current accounts that credit institutions hold at the central bank. In the last five years, following both the increase in the digitalisation of the modern economy and the example of hegemonic economies (such as China), the possible introduction of a new form of currency to provide a safe and stable mean of payment to citizens of the euro area has had the power to create a growing interest towards such ambitious solutions. As a result, in the very near future we could experience a different way in which money works. We refer to the uncharted world of central bank digital currencies (CBDC). While projects for the creation of central bank digital currencies are booming all around the world, such interest is driven by various reasons that will be analysed in this paper, including the need to react to private initiatives for the creation of cryptocurrencies and stablecoins and, an increasing demand for fast and interconnected digital financial instruments and products. In the euro area, even if the debate for the creation of a Digital Euro has recently started, the ECB has proven to be already engaged in investigations, public consultations, and discussions with focus groups with the aim to provide European citizens, firms, and intermediaries with a “public” payment instrument suitable for a new digital era. In this framework, the role of a Eurosystem central bank digital currency will be analysed from a legal perspective. First, apart from the abovementioned reasons leading to the creation of a CBDC, it will be crucial to examine the structure and design of the Digital Euro, together with its objectives and the needs of its users. Consequently, while investigating on the legal framework which will permit the introduction of this digital currency, through a light review of similar models adopted (or in adoption) by other countries, we will seek to assess whether legal issues might hinder the realisation of this project or its actual implementation, especially concerning the impact on monetary policy, the international role of the euro and the banking sector. [less ▲]

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See detailEthnic Bias after Ethnic Conflict: Preferential Voting and the Serb Minority in Croatian Elections
Glaurdic, Josip UL; Mochtak, Michal UL; Lesschaeve, Christophe UL

in Ethnopolitics (2021)

In spite of growing interest in democratization and electoral competition after ethnic conflict, we know little about the impact of ethnic violence on voter choice in post-conflict societies. This article ... [more ▼]

In spite of growing interest in democratization and electoral competition after ethnic conflict, we know little about the impact of ethnic violence on voter choice in post-conflict societies. This article uses an original dataset of local-level electoral results, communities’ exposure to war violence, and candidates’ ethnicity derived from names in contemporary Croatia to uncover the relationship between local post-conflict ethnic distribution, ethnic violence, and the electorate’s ethnic bias. Our analysis points to the presence of ethnic bias that is determined by local interethnic balance and exposure to war violence – particularly for communities populated by the Serb minority. [less ▲]

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See detailWarehousing asylum seekers: The logistification of reception
Vianelli, Lorenzo UL

in Environment and Planning. D, Society and Space (2021)

This article employs the analytical perspective of logistics to explore a key, yet quite overlooked, aspect of the functioning of the EU border regime: the reception and associated territorial ... [more ▼]

This article employs the analytical perspective of logistics to explore a key, yet quite overlooked, aspect of the functioning of the EU border regime: the reception and associated territorial distribution of newly arrived asylum seekers. Drawing on qualitative data collected at the height of ‘refugee reception crisis’ in multiple contexts in Italy and Sweden, the article shows how reception is undergoing a process of ‘logistification’. In this process, organisational and logistical concerns prevail over the care for those who are assisted, and reception is turned into a logistical matter of moving and accommodating asylum seekers. Crucial to this process of ‘logistification’ is the warehousing of asylum seekers – an art of government that seeks to objectify asylum seekers through their depersonalisation, victimisation and (im)mobilisation. The article argues that the ‘logistification’ of reception not only has dehumanising effects on asylum seekers, but also exposes the attempt to make profit out their management and transfer. This creates the conditions for the development of a reception industry in which the very presence of asylum seekers is valorised for the profit of a whole range of actors who ensure the reproduction, transfer, knowledge and control of those hosted in reception facilities. [less ▲]

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See detailApplying the Presumption of Innocence to Policing with AI
Blount, Kelly UL

in International Review of Penal Law (2021), 92(1),

This paper argues that predictive policing, which relies upon former arrest records, hinders the future application of the presumption of innocence. This is established by positing that predictive ... [more ▼]

This paper argues that predictive policing, which relies upon former arrest records, hinders the future application of the presumption of innocence. This is established by positing that predictive policing is comparable to traditional criminal investigations in substance and scope. Police records generally do not clarify whether former charges result in dismissal or acquittal, or conversely, conviction. Therefore, police as state actors may unlawfully act in reliance on an individual’s former arrest record, despite a favourable disposition. Accordingly, it is argued that the presumption of innocence as a fair trial right may be effectively nullified by predictive policing. [less ▲]

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See detailThe impact of Brexit on “bail-inable” liabilities under English law
Lupinu, Pier Mario UL

in Queen Mary Law Journal (2021), (1), 22

Several years have passed since 29 March 2017, the date when the United Kingdom (UK) triggered Article 50 of the Treaty on European Union (TEU). This date has become well-known for paving the way to ... [more ▼]

Several years have passed since 29 March 2017, the date when the United Kingdom (UK) triggered Article 50 of the Treaty on European Union (TEU). This date has become well-known for paving the way to multiple legal and political issues, most of which depend on the agreement setting the conditions for the future relations between the European Union (EU) and the UK. In reference to the resolution of a credit institution established in the EU in a state of imminent crisis, Brexit might negatively affect its shareholders and bondholders who were called upon to contribute by absorbing losses and recapitalising the bank through the bail-in instrument. In particular, when the bail-in converts or writes down liabilities previously established under English law. To date, the EU legal framework for the resolution of credit institutions envisages a provision for the direct recognition of liabilities governed under any of the EU Member States’ law. This means that, due to Brexit, English law liabilities are no longer directly recognised at the EU level. However, the Bank Recovery and Resolution Directive (BRRD), one of the pillars of the EU legislation relating to resolution, leaves to each EU Member State the duty to require financial entities to include “resolution-proof” clauses in the contracts establishing such liabilities or, alternatively, to conclude a binding agreement with the relevant third country. This creates issues concerning both the recognition of English law liabilities established pre-BRRD and to post-BRRD liabilities not compliant with the contractual requirement. By analysing the EU and UK legal frameworks, this paper aims to address possible solutions to ease a future resolution procedure involving the use of the bail-in instrument towards English law liabilities. The purpose is to ease both the determination of the Minimum Requirement for own fund and Eligible Liabilities (MREL) and the resolution process for the relevant authority in charge of the resolution procedure, since an orderly bail-in of those problematic liabilities could improve the effectiveness of the instrument and the success of the whole resolution procedure. [less ▲]

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See detailEffects of topological band structure on thermoelectric transport of bismuthene
Gaffar, Muhammad; Wella, Sasfan Arman; Hasdeo, Eddwi Hesky UL

in Physical Review. B (2021), 104(20), 205105

Two-dimensional bismuth (Bi) layer, known as bismuthene, exhibits Z2 topological bulk states due to large spin-orbit coupling that inverts the bands. Using the tight-binding method, we calculate the band ... [more ▼]

Two-dimensional bismuth (Bi) layer, known as bismuthene, exhibits Z2 topological bulk states due to large spin-orbit coupling that inverts the bands. Using the tight-binding method, we calculate the band structure of buckled bismuthene to understand its topological and trivial phases. We determine the thermoelectric properties for some considered phases, incorporating the edge states contribution, by using the linearized Boltzmann transport equation with a constant relaxation time approximation. It is shown that the thermoelectric figure of merit, ZT, actually drops in undoped topological bismuthene due to the edge effects. Surprisingly, the topological edge states enhance ZT at large doping with the Fermi energy near the bottom of bulk bands when bismuthene is nearly metallic. [less ▲]

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See detailCANMatch: A Fully Automated Tool for CAN Bus Reverse Engineering based on Frame Matching
Buscemi, Alessio UL; Turcanu, Ion; Castignani, German et al

in IEEE Transactions on Vehicular Technology (2021)

Controller Area Network (CAN) is the most frequently used in-vehicle communication system in the automotive industry today. The communication inside the CAN bus is typically encoded using proprietary ... [more ▼]

Controller Area Network (CAN) is the most frequently used in-vehicle communication system in the automotive industry today. The communication inside the CAN bus is typically encoded using proprietary formats in order to prevent easy access to the information exchanged on the bus. However, it is still possible to decode this information through reverse engineering, performed either manually or via automated tools. Existing automated CAN bus reverse engineering methods are still time-consuming and require some manual effort, i.e., to inject diagnostic messages in order to trigger specific responses. In this paper, we propose CANMatch a fully automated CAN bus reverse engineering framework that does not require any manual effort and significantly decreases the execution time by exploiting the reuse of CAN frames across different vehicle models. We evaluate the proposed solution on a dataset of CAN logs, or traces, related to 479 vehicles from 29 different automotive manufacturers, demonstrating its improved performance with respect to the state of the art. [less ▲]

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See detailAutomatic Integration of Numerical Formats Examined with Frequency-tagged EEG
Marinova, Mila UL; Georges, Carrie UL; Guillaume, Mathieu et al

in Scientific Reports (2021)

How humans integrate and abstract numerical information across different formats is one of the most debated questions in human cognition. We addressed the neuronal signatures of the numerical integration ... [more ▼]

How humans integrate and abstract numerical information across different formats is one of the most debated questions in human cognition. We addressed the neuronal signatures of the numerical integration using an EEG technique tagged at the frequency of visual stimulation. In an oddball design, participants were stimulated with standard sequences of numbers (<5) depicted in single (digits, dots, number words) or mixed notation (dots – digits, number words – dots, digits – number words), presented at 10Hz. Periodically, a deviant stimulus (>5) was inserted at 1.25 Hz. We observed significant oddball amplitudes for all single notations, showing for the first time using this EEG technique, that the magnitude information is spontaneously and unintentionally abstracted, irrespectively of the numerical format. Significant amplitudes were also observed for digits – number words and number words – dots, but not for digits – dots, suggesting an automatic integration across some numerical formats. These results imply that direct and indirect neuro-cognitive links exist across the different numerical formats. [less ▲]

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See detailTherapeutic maps for a sensor-based evaluation of deep brain stimulation programming
Bremm, René Peter UL; Berthold; Krüger, Rejko UL et al

in Biomedizinische Technik. Biomedical Engineering (2021)

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See detailThe Health Effects of Workforce Involvement and Transitions for Europeans 50–75 Years of Age: Heterogeneity by Financial Difficulties and Gender
Settels, Jason UL

in Canadian Journal on Aging (2021)

A prominent demographic trend throughout the industrialized world is population aging. Concerns about economic growth and labour force shortages have led many European nations to enact policies aimed at ... [more ▼]

A prominent demographic trend throughout the industrialized world is population aging. Concerns about economic growth and labour force shortages have led many European nations to enact policies aimed at prolonging working life. Understanding how paid work among late-middle-aged and senior adults is associated with health is therefore important. Using a sample of persons who were 50–75 years of age in 2015 from waves six (2015) and seven (2017) of the Survey of Health, Ageing and Retirement in Europe (n = 38,884), this study shows how a comprehensive set of six workforce involvement/transitions patterns are associated with health. The results show benefits of paid work, especially among respondents having financial difficulties. There is further heterogeneity by gender. The more fragmented employment histories of 50–75-year-old women are associated with stable paid work being of less benefit for addressing financial difficulties and with their health being especially vulnerable to unemployment while they are undergoing financial troubles. [less ▲]

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See detailHigher Education Organizations as Strategic Actors in Networks: Institutional and Relational Perspectives Meet Social Network Analysis
Dusdal, Jennifer UL; Zapp, Mike UL; Marques, Marcelo et al

in Theory and Method in Higher Education Research (2021), 7

Informed by multiple disciplines, theories, and methods, higher education scholars have developed a robust and diverse literature in many countries. Yet, some important (organizational) sociological ... [more ▼]

Informed by multiple disciplines, theories, and methods, higher education scholars have developed a robust and diverse literature in many countries. Yet, some important (organizational) sociological perspectives, both more established and more recent, are insufficiently linked. In particular, we identify two theoretical strands—institutional and relational—that, when joined, help to explain contemporary developments in global higher education and yield new organizational insights. We review relevant literature from each perspective, both in their general formulations and with specific reference to contemporary higher education research. Within the broad institutional strand, we highlight Strategic Action Fields, organizational actorhood, and associational memberships. Within the relational strand, we focus on ties and relationships that are especially crucial as science has entered an age of (inter)national research collaboration. Across these theories, we discuss linkages between concepts, objects, and levels of analysis. We explore the methodological approach of social network analysis as it offers great potential to connect these strands and thus to advance contemporary higher education research in a collaborative era. [less ▲]

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See detailPoster: Commercial 5G Performance: A V2X Experiment
Frank, Raphaël UL; Hawlader, Faisal UL

in Proceedings of the 13th Vehicular Networking Conference 2021 (2021)

This poster paper presents the results of a 4G/5G measurements campaign conducted in Luxembourg City in August 2021. We test the performance of both network technologies while stationary and on the move ... [more ▼]

This poster paper presents the results of a 4G/5G measurements campaign conducted in Luxembourg City in August 2021. We test the performance of both network technologies while stationary and on the move. We report the results for download and upload throughputs, as well as the Round-trip Time (RTT). We briefly discuss the results in the context of Vehicle-to-Everything (V2X) applications. [less ▲]

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See detailTowards a Framework to Evaluate Cooperative Perception for Connected Vehicles
Hawlader, Faisal UL; Frank, Raphaël UL

in Proceedings of the 13th IEEE Vehicular Networking Conference 2021 (2021)

Over the past few years, Connected and Autonomous Vehicles (CAVs) have gained significant research attention. With the recent deployment of 5G networks in many metropolitan areas, new cooperative driving ... [more ▼]

Over the past few years, Connected and Autonomous Vehicles (CAVs) have gained significant research attention. With the recent deployment of 5G networks in many metropolitan areas, new cooperative driving concepts are emerging. One of those is cooperative perception, where vehicles exchange sensory information via a V2X network to maximize their awareness horizon without the need for additional and potentially expensive sensors. The idea is to distribute the processing of the sensor information to find the best trade-off between data transmission and processing time. To experimentally evaluate the performance of cooperative perception schemes is time-consuming and costly due to the expensive hardware it involves. To the best of our knowledge there is to date no open- source simulation framework that allows to transfer realistic sensor data between multiple simulated vehicles via a V2X network. In this work-in-progress paper, we address this issue by proposing an extension of the well-known CARLA open- source simulator for automated driving research. We implement a basic communication channel on top of the existing client-server architecture of CARLA and show how sensor information can be exchanged. Transferring realistic sensor information between multiple vehicles opens up a wide range of experiments to test and evaluate novel approaches to collaborative driving in simulation. [less ▲]

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See detailGenome Sequencing of SARS-CoV-2 Allows Monitoring of Variants of Concern through Wastewater
Herold, Malte; Fouquier d'herouël, Aymeric UL; May, Patrick UL et al

in Water (2021), 13(21 3018),

Monitoring SARS-CoV-2 in wastewater has shown to be an effective tool for epidemiological surveillance. More specifically, RNA levels determined with RT-qPCR have been shown to track with the infection ... [more ▼]

Monitoring SARS-CoV-2 in wastewater has shown to be an effective tool for epidemiological surveillance. More specifically, RNA levels determined with RT-qPCR have been shown to track with the infection dynamics within the population. However, the surveillance of individual lineages circulating in the population based on genomic sequencing of wastewater samples is challenging, as the genetic material constitutes a mixture of different viral haplotypes. Here, we identify specific signature mutations from individual SARS-CoV-2 lineages in wastewater samples to estimate lineages circulating in Luxembourg. We compare circulating lineages and mutations to those detected in clinical samples amongst infected individuals. We show that especially for dominant lineages, the allele frequencies of signature mutations correspond to the occurrence of particular lineages in the population. In addition, we provide evidence that regional clusters can also be discerned. We focused on the time period between November 2020 and March 2021 in which several variants of concern emerged and specifically traced the lineage B.1.1.7, which became dominant in Luxembourg during that time. During the subsequent time points, we were able to reconstruct short haplotypes, highlighting the co-occurrence of several signature mutations. Our results highlight the potential of genomic surveillance in wastewater samples based on amplicon short-read data. By extension, our work provides the basis for the early detection of novel SARS-CoV-2 variants. [less ▲]

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See detailThe Socioeconomic gradient in child health and noncognitive skills: Evidence from the Czech Republic
Borga, Liyousew UL; Munich, Daniel; Kukla, Lubomir

in Economics and Human Biology (2021)

We investigate the presence of a socioeconomic status (SES) gradient in children's health and noncognitive skill development, and its evolution with child age using cohort data from the Czech Republic. We ... [more ▼]

We investigate the presence of a socioeconomic status (SES) gradient in children's health and noncognitive skill development, and its evolution with child age using cohort data from the Czech Republic. We show that family SES are positively associated with better child health. These effects start to emerge at age 3 and are persistent for all subsequent ages. We find a modest strengthening of the gradient as the children grow older. Similarly, at the lowest distribution of average family income, children lag in their noncognitive skills. We find evidence that children enter school with substantial differences in noncognitive skill endowments based on family SES. This correlation persists when controlling for poor health at birth, the roles of specific and chronic health problems, housing conditions, and partner characteristics. Maternal health status explains some of the association between family income and child noncognitive skills. We account for the endogeniety of SES and non-linearities in measures. [less ▲]

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See detailRoadmap on organic–inorganic hybrid perovskite semiconductors and devices
Schmidt-Mende, Lukas; Dyakonov, Vladimir; Olthof, Selina et al

in APL Materials (2021)

Metal halide perovskites are the first solution processed semiconductors that can compete in their functionality with conventional semiconductors, such as silicon. Over the past several years, perovskite ... [more ▼]

Metal halide perovskites are the first solution processed semiconductors that can compete in their functionality with conventional semiconductors, such as silicon. Over the past several years, perovskite semiconductors have reported breakthroughs in various optoelectronic devices, such as solar cells, photodetectors, light emitting and memory devices, and so on. Until now, perovskite semiconductors face challenges regarding their stability, reproducibility, and toxicity. In this Roadmap, we combine the expertise of chemistry, physics, and device engineering from leading experts in the perovskite research community to focus on the fundamental material properties, the fabrication methods, characterization and photophysical properties, perovskite devices, and current challenges in this field. We develop a comprehensive overview of the current state-of-the-art and offer readers an informed perspective of where this field is heading and what challenges we have to overcome to get to successful commercialization. [less ▲]

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See detailJudicial review of EU soft law: a revolutionary step which has not fully happened (Case note on BT v. Balgarska Narodna Banka, C-501/18)
Hubkova, Pavlina UL

in Revista General de Derecho Europeo (2021), (55),

In the judgment in case BT v Balgarska Narodna Banka, the Court of Justice of the EU declared, for the first time, invalid a part of a legally non-binding EU act – a recommendation adopted by the European ... [more ▼]

In the judgment in case BT v Balgarska Narodna Banka, the Court of Justice of the EU declared, for the first time, invalid a part of a legally non-binding EU act – a recommendation adopted by the European Banking Authority and addressed to the Bulgarian National Bank. It also confirmed that the referring court deciding upon damages has a duty to take such a recommendation into consideration. Moreover, the individuals in the national proceedings should have a right to rely upon the content of the recommendation even if they are not addressees of such an act. However, when assessed in more detail, the case points out to several interesting aspects related to EU soft law that have not been properly discussed yet. [less ▲]

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See detailContesting war memories: Parties and voters in contemporary Southeast Europe
Glaurdic, Josip UL; Lesschaeve, Christophe UL; Mochtak, Michal UL

in Party Politics (2021)

Over the past four decades, there has been a proliferation of interest in the causes, consequences, and dynamics of contestation over collective memories across a variety of fields. Unfortunately ... [more ▼]

Over the past four decades, there has been a proliferation of interest in the causes, consequences, and dynamics of contestation over collective memories across a variety of fields. Unfortunately, collective memories—particularly those of traumatic experiences of violence such as wars and revolutions—have been largely absent from party politics research. Using data collected in an expert survey on the policy positions and ideological orientations of all relevant political parties, as well as an extensive survey of more than ten thousand voters in the six post-conflict countries of Southeast Europe, we demonstrate that collective memories of war are not only subjects of historiographical contestation but are also significant sources of ideological and policy differentiation among political parties, as well as one of the strongest determinants of voter choice. Our analysis shows that collective memories are politically contested and that party politics research would benefit from taking them seriously. [less ▲]

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See detailThroughput Enhancement in FD- and SWIPT-enabled IoT Networks over Non-Identical Rayleigh Fading Channel
Nguyen, Nhat Tan; Tran Dinh, Hieu UL; Chatzinotas, Symeon UL et al

in IEEE Internet of Things Journal (2021)

Simultaneous wireless information and power transfer (SWIPT) and full-duplex (FD) communications have emerged as prominent technologies in overcoming the limited energy resources in Internet-of-Things ... [more ▼]

Simultaneous wireless information and power transfer (SWIPT) and full-duplex (FD) communications have emerged as prominent technologies in overcoming the limited energy resources in Internet-of-Things (IoT) networks and improving their spectral efficiency (SE). The article investigates the outage and throughput performance for a decode-and-forward (DF) relay SWIPT system, which consists of one source, multiple relays, and one destination. The relay nodes in this system can harvest energy from the source’s signal and operate in FD mode. A suboptimal, low-complexity, yet efficient relay selection scheme is also proposed. Specifically, a single relay is selected to convey information from a source to a destination so that it achieves the best channel from the source to the relays. An analysis of outage probability (OP) and throughput performed on two relaying strategies, termed static power splitting-based relaying (SPSR) and optimal dynamic power splitting-based relaying (ODPSR), is presented. Notably, we considered independent and non-identically distributed (i.n.i.d.) Rayleigh fading channels, which pose new challenges in obtaining analytical expressions. In this context, we derived exact closed-form expressions of the OP and throughput of both SPSR and ODPSR schemes. We also obtained the optimal power splitting ratio of ODPSR for maximizing the achievable capacity at the destination. Finally, we present extensive numerical and simulation results to confirm our analytical findings. Both simulation and analytical results show the superiority of ODPSR over SPSR. [less ▲]

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See detailEvasion Attack STeganography: Turning Vulnerability Of Machine Learning ToAdversarial Attacks Into A Real-world Application
Ghamizi, Salah UL; Cordy, Maxime UL; Papadakis, Mike UL et al

in Proceedings of International Conference on Computer Vision 2021 (2021)

Evasion Attacks have been commonly seen as a weakness of Deep Neural Networks. In this paper, we flip the paradigm and envision this vulnerability as a useful application. We propose EAST, a new ... [more ▼]

Evasion Attacks have been commonly seen as a weakness of Deep Neural Networks. In this paper, we flip the paradigm and envision this vulnerability as a useful application. We propose EAST, a new steganography and watermarking technique based on multi-label targeted evasion attacks. Our results confirm that our embedding is elusive; it not only passes unnoticed by humans, steganalysis methods, and machine-learning detectors. In addition, our embedding is resilient to soft and aggressive image tampering (87% recovery rate under jpeg compression). EAST outperforms existing deep-learning-based steganography approaches with images that are 70% denser and 73% more robust and supports multiple datasets and architectures. [less ▲]

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See detailLeveraging High-Frequency Components for Deepfake Detection
Mejri, Nesryne UL; Papadopoulos, Konstantinos UL; Aouada, Djamila UL

in IEEE Workshop on Multimedia Signal Processing (2021)

In the past years, RGB-based deepfake detection has shown notable progress thanks to the development of effective deep neural networks. However, the performance of deepfake detectors remains primarily ... [more ▼]

In the past years, RGB-based deepfake detection has shown notable progress thanks to the development of effective deep neural networks. However, the performance of deepfake detectors remains primarily dependent on the quality of the forged content and the level of artifacts introduced by the forgery method. To detect these artifacts, it is often necessary to separate and analyze the frequency components of an image. In this context, we propose to utilize the high-frequency components of color images by introducing an end-to-end trainable module that (a) extracts features from high-frequency components and (b) fuses them with the features of the RGB input. The module not only exploits the high-frequency anomalies present in manipulated images but also can be used with most RGB-based deepfake detectors. Experimental results show that the proposed approach boosts the performance of state-of-the-art networks, such as XceptionNet and EfficientNet, on a challenging deepfake dataset. [less ▲]

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See detailPerformance assessment of the relative gravimeter Scintrex CG-6
Francis, Olivier UL

in Journal of Geodesy (2021), 95:116

The new-generation relative gravimeter Scintrex CG6 is put on the test bench: Its performance is compared to its predecessor, the Scintrex-CG5. A CG5 Scintrex and a CG6 Scintrex were both submitted to the ... [more ▼]

The new-generation relative gravimeter Scintrex CG6 is put on the test bench: Its performance is compared to its predecessor, the Scintrex-CG5. A CG5 Scintrex and a CG6 Scintrex were both submitted to the same rigorous tests, which have been developed in recent years to highlight some defects of the CG5. The results show that the CG6 always performs better than the CG5. For instance, the instrumental drift is 5 times smaller for the CG6 than for the CG5. In the tidal bands, the noise level of the CG6 is 3 times lower than of the one of the CG5. We confirmed the tilt susceptibility of the CG5 and found that the CG6 is barely affected by long duration tilts before taking measurements. Unlike the CG5, the CG6 measurements are not influenced by external temperature variations. Overall, the CG6 provides more precise and stable gravity measurements compared to the CG5. [less ▲]

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See detailIntelligent Autonomous Agents and Trust in Virtual Reality
Sun, Ningyuan UL; Botev, Jean UL

in Computers in Human Behavior Reports (2021)

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See detailAnalysis of residual stress relaxation of aluminum alloys EN AW 6061/-82 T6 under cyclic loading
Repplinger, Christian UL; Sellen, Stephan UL; Kedziora, Slawomir UL et al

in Fatigue and Fracture of Engineering Materials and Structures (2021)

Stress relaxation describes the reduction of stress under static or cyclic loading at a constant strain level. Several processes induce intentionally residual stresses, for example, autofrettage of thick ... [more ▼]

Stress relaxation describes the reduction of stress under static or cyclic loading at a constant strain level. Several processes induce intentionally residual stresses, for example, autofrettage of thick-walled pressurized tubes to improve their fatigue life. This well-known process induces residual compressive stresses at the critical inner surface by using a single static but controlled over- loading internal pressure. Relaxation of residual stresses due to cyclic loading in service would endanger the effectiveness of autofrettage and could finally lead to unexpected fatigue failure. In this study, strain-controlled experiments up to 500,000 load cycles and amending nonlinear finite element simulations were done for the aluminum alloys EN AW 6061 T6 and EN AW 6082 T6 to study potential cyclic stress relaxation in four-point bending tests after con- trolled single static plasticization for residual stress generation. This analysis identifies almost stable residual stresses for both materials under different cyclic strain-controlled load levels. [less ▲]

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See detailDeep Learning to Predict the Feasibility of Priority-Based Ethernet Network Configurations
Mai, Tieu Long UL; Navet, Nicolas UL

in ACM Transactions on Cyber-Physical Systems (2021), 5(4), 126

Machine learning has been recently applied in real-time systems to predict whether Ethernet network configurations are feasible in terms of meeting deadline constraints without executing conventional ... [more ▼]

Machine learning has been recently applied in real-time systems to predict whether Ethernet network configurations are feasible in terms of meeting deadline constraints without executing conventional schedulability analysis. However, the existing prediction techniques require domain expertise to choose the relevant input features and do not perform consistently when topologies or traffic patterns differ significantly from the ones in the training data. To overcome these problems, we propose a Graph Neural Network (GNN) prediction model that synthesizes relevant features directly from the raw data. This deep learning model possesses the ability to exploit relations among flows, links, and queues in switched Ethernet networks, and generalizes to unseen topologies and traffic patterns. We also explore the use of ensembles of GNNs and show that it enhances the robustness of the predictions. An evaluation on heterogeneous testing sets comprising realistic automotive networks, shows that ensembles of 32 GNN models features a prediction accuracy ranging from 79.3% to 90% for Ethernet networks using priorities as the Quality-of-Service mechanism. The use of ensemble models provides a speedup factor ranging from 77 to 1715 compared to schedulability analysis, which allows a far more extensive design space exploration. [less ▲]

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See detailAnalysis of the geometrical imperfections of a dry-stacked masonry block based on Miscanthus
Pereira Dias, Patrick; Jesuino Kammer, Vanessa; Waldmann, Daniele UL

in Construction and Building Materials (2021)

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See detailIs the Z2xZ2-graded sine-Gordon equation integrable?
Bruce, Andrew UL

in Nuclear Physics B (2021), 971

We examine the question of the integrability of the recently defined Z2xZ2-graded sine-Gordon model, which is a natural generalisation of the supersymmetric sine-Gordon equation. We do this via ... [more ▼]

We examine the question of the integrability of the recently defined Z2xZ2-graded sine-Gordon model, which is a natural generalisation of the supersymmetric sine-Gordon equation. We do this via appropriate auto-Bäcklund transformations, construction of conserved spinor-valued currents and a pair of infinite sets of conservation laws. [less ▲]

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See detailExplicar los impactos de la globalización en las zonas transfronterizas a través de la calidad de la democracia. Un marco interregional comparativo
Koff, Harlan UL; Mejía Idarraga, Santiago

in Estudios Políticos (2021), 62

Globalisation has significantly affected the ability of States to govern flows. Important questions which have recently emerged in international relations ask: how has globalisation affected border ... [more ▼]

Globalisation has significantly affected the ability of States to govern flows. Important questions which have recently emerged in international relations ask: how has globalisation affected border regions and what explains these impacts? Employing a comparative, cross-regional research design, this article proposes two originalresponses to these questions: first, it questions whether border communities benefit or suffer from globalization and, in doing so, it addresses the impacts of globalization on border communities. Second, an attempt is made to explain these impacts by studying the democratic quality of border integration processes. Thus, globalization is examined as a system in which the benefits are distributed or concentrated according to the quality of the integration processes. [less ▲]

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See detailCase study on augmented reality, digital and physical modelling with mathematical learning disabilities students in an elementary school in Luxemburg
Haas, Ben; Kreis, Yves UL; Lavicza, Zsolt

in International Journal for Technology in Mathematics Education (2021), 28(3), 125-132

This paper reports on a case study of two elementary school students with mathematical learning disabilities (MLD) (ages 10 and 11) using augmented reality (AR), digital and physical modelling in ... [more ▼]

This paper reports on a case study of two elementary school students with mathematical learning disabilities (MLD) (ages 10 and 11) using augmented reality (AR), digital and physical modelling in mathematics class. MLD students worked on modelling geometric shapes (cubes, cuboids, squared pyramids, and octahedrons) and forms (polygons) by combining real-world objects with AR and creating a copy of geometric shapes or missing parts with a 3D printing device. The study focused on the development of process skills and mathematical concepts, tried to identify changes in the visual-spatial memory, and documented the learning behaviour in class. Further, we collected data through task-based interviews with both students. Based on our findings, we present settings and manipulatives which are likely to foster process skills and mathematical concepts in geometry tasks suitable for MLD elementary school students. [less ▲]

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See detailSeeking 'truth' after devastating, multi-layered conflict: The complex case of transitional justice in South Sudan
Owiso, Owiso UL

in Journal of International Humanitarian Legal Studies (2021)

In August 2015, the Government of South Sudan and other parties to the country’s civil conflict signed a peace agreement, the Agreement on the Resolution of the Conflict in the Republic of South Sudan ... [more ▼]

In August 2015, the Government of South Sudan and other parties to the country’s civil conflict signed a peace agreement, the Agreement on the Resolution of the Conflict in the Republic of South Sudan, aimed at ending the civil conflict that broke out on 15 December 2013. After this agreement failed to hold, South Sudan descended into a second wave of civil conflict. A recommitment to the agreement was secured through regional efforts on 12 September 2018. Dubbed the Revitalised Agreement on the Resolution of the Conflict in the Republic of South Sudan, the agreement provides a transitional justice architecture which includes a truth commission, a hybrid court and a reparations authority. This paper examines the potential of the proposed Commission for Truth, Reconciliation and Healing to contribute towards sustainable transitional justice solutions in South Sudan, based on contemporary standards and practice of transitional justice. Through historical, descriptive and analytical approaches, the paper grapples with South Sudan’s complex truth-seeking journey following years of multi-layered conflict. [less ▲]

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See detailChronique de droit des marchés financiers
Conac, Pierre-Henri UL

in Revue des Sociétés (2021)

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See detailIntegrated STEAM Approach in Outdoor Trails with Elementary School Pre-service Teachers in Luxemburg
Haas, Ben; Kreis, Yves UL; Lavicza, Zsolt

in Journal of Educational Technology and Society (2021), 24(4), 205-219

Due to the COVID-19 pandemic it was impossible to carry out on-campus teaching and examinations as planned for the first-year elementary school Bachelor’s degree teacher training courses during the summer ... [more ▼]

Due to the COVID-19 pandemic it was impossible to carry out on-campus teaching and examinations as planned for the first-year elementary school Bachelor’s degree teacher training courses during the summer term of 2019/2020. Therefore, we moved our on-campus STEAM (Science, Technology, Engineering, Arts and Mathematics) related courses to schooling at home. For their course examination, students designed outdoor trails in groups with the educational technology MathCityMap based on an integrated STEAM approach. Hence, they combined STEAM with real-world situations (e.g., monuments, marketplaces, playgrounds). The tasks within the trails required the use of technologies such as augmented reality (AR), digital modelling (e.g., GeoGebra 3D Graphing Calculator), and GPS. Analogue measuring tools (e.g., triangle ruler) were also used in the task designs. We collected data from 21 trails with 259 tasks from 49 pre-service teachers to analyse the effects on professional growth in STEAM education. Through hierarchical cluster analysis we identified three different clusters with patterns regarding STEAM in outdoor trails. This paper will describe a pedagogical framework for the integrated STEAM approach to designing and evaluating outdoor trails. Furthermore, we will explain patterns pre-service teachers developed during this professional development. [less ▲]

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See detailThe Digital Humanities Classroom as a “Node”. From Toolbox to Mindset?
Armaselu, Florentina UL

in DH Benelux Journal (2021), 3(Autumn 2021), 103-115

The paper describes a framework for digital pedagogy and evaluation that combines different approaches – theoretical, application-oriented and project-based –, underpinned by a view of the digital ... [more ▼]

The paper describes a framework for digital pedagogy and evaluation that combines different approaches – theoretical, application-oriented and project-based –, underpinned by a view of the digital humanities classroom metaphorically defined as a “node”. The metaphor encompasses the hybrid character of digital humanities teaching, as a crossing or convergence of paths, which involves the use of various categories of study materials, themes, examples, methodologies and skills, as well as exchange, circulation of ideas and connection with other disciplines. It is assumed that the application of this type of hybrid approach in the course design, together with the coverage of a variety of tools to be studied in class, might foster a reflective mindset, enabling the students to contextualise the digital technologies within different humanities areas, beyond the acquisition of technical skills and knowledge of computational methods and tools usually referred to as the toolbox-based education paradigm. [less ▲]

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See detailLocal Forms of Morphisms of Colored Supermanifolds
Covolo, Tiffany; Kwok, Stephen; Poncin, Norbert UL

in Journal of Geometry and Physics (2021), 168

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See detailGetting Creative - AI and Arts
Schommer, Christoph UL

in Keynote Talk; AIFA - Artificial Intelligence and the Future of Arts (2021)

Keynote Talk "Getting Creative - AI and Arts"; AIFA - Artificial Intelligence and the Future of Arts

Detailed reference viewed: 119 (0 UL)