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See detailInnovation Search Strategy and Predictable Returns
Fitzgerald, Tristan; Balsmeier, Benjamin UL; Fleming, Lee et al

in Management Science (in press)

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See detailManaging Strategic Inventories under Investment in Process Improvement
Mantin, Benny UL; Veldman, Jasper

in European Journal of Operational Research (in press)

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See detailA Look into Privacy-Preserving Blockchains
Khan, Nida UL; Nassar, Mohamed

in IEEE BCA @AICCSA 2019 - Workshop on Blockchain and it's Applications (in press)

Blockchain is a revolutionary technology promising a new generation of decentralized, transparent and tamper-proof database systems. However, one of the main challenges of the emerging blockchain systems ... [more ▼]

Blockchain is a revolutionary technology promising a new generation of decentralized, transparent and tamper-proof database systems. However, one of the main challenges of the emerging blockchain systems remains to address data privacy. While in Bitcoin and similar e-cash systems, privacy was limited to anonymity and addressed by using cryptographic pseudonyms for identification and authentication of parties, the question of privacy has more breadth in systems maintaining actual data such as medical records or energy meters. In this paper, we look into recently proposed privacy-preserving blockchains, analyze their strengths and weaknesses, and highlight research questions requiring future investigation. We conclude that privacy-preserving blockchains are still in their infancy and more research is definitely needed in this area. [less ▲]

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See detailCorruption and tax compliance: evidence from small retailers in Bamako, Mali
Bertinelli, Luisito UL; Bourgain, Arnaud UL; Leon, Florian UL

in Applied Economics Letters (in press)

We investigate the impact of corruption on tax compliance using a sample of 700 small business in Bamako, Mali. The main contribution of this paper is to focus on micro-enterprises (including semi-formal ... [more ▼]

We investigate the impact of corruption on tax compliance using a sample of 700 small business in Bamako, Mali. The main contribution of this paper is to focus on micro-enterprises (including semi-formal and informal ones), while existing works concentrate on large and formal firms. Our results show that (i) even very small firms pay taxes (two-thirds of firms pay taxes in our sample); and, (ii) paying bribes reduces significantly tax compliance. This latter finding is robust (i) to the addition of a set of control variables accounting for other determinants, (ii) to treatment for endogeneity, and (iii) the use of a different proxy for tax compliance. [less ▲]

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See detailGenerating Automated and Online Test Oracles for Simulink Models with Continuous and Uncertain Behaviors
Menghi, Claudio UL; Nejati, Shiva UL; Gaaloul, Khouloud UL et al

in Proceedings of the 27th ACM Joint European Software Engineering Conference and Symposium on the Foundations of Software Engineering (ESEC/FSE ’19), (in press)

Test automation requires automated oracles to assess test outputs. For cyber physical systems (CPS), oracles, in addition to be automated, should ensure some key objectives: (i) they should check test ... [more ▼]

Test automation requires automated oracles to assess test outputs. For cyber physical systems (CPS), oracles, in addition to be automated, should ensure some key objectives: (i) they should check test outputs in an online manner to stop expensive test executions as soon as a failure is detected; (ii) they should handle time- and magnitude-continuous CPS behaviors; (iii) they should provide a quantitative degree of satisfaction or failure measure instead of binary pass/fail outputs; and (iv) they should be able to handle uncertainties due to CPS interactions with the environment. We propose an automated approach to translate CPS requirements specified in a logic-based language into test oracles specified in Simulink - a widely-used development and simulation language for CPS. Our approach achieves the objectives noted above through the identification of a fragment of Signal First Order logic (SFOL) to specify requirements, the definition of a quantitative semantics for this fragment and a sound translation of the fragment into Simulink. The results from applying our approach on 11 industrial case studies show that: (i) our requirements language can express all the 98 requirements of our case studies; (ii) the time and effort required by our approach are acceptable, showing potentials for the adoption of our work in practice, and (iii) for large models, our approach can dramatically reduce the test execution time compared to when test outputs are checked in an offline manner. [less ▲]

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See detailGlucocorticoid receptor signaling in leukocytes after early life adversity.
Elwenspoek, M.; Hengesch, X.; Leenen, F. et al

in Development and Psychopathology (in press)

Early life adversity (ELA) has been associated with inflammation and immunosenescence, as well as hyporeactivity of the HPA-axis. As the immune system and HPA-axis are tightly intertwined around the ... [more ▼]

Early life adversity (ELA) has been associated with inflammation and immunosenescence, as well as hyporeactivity of the HPA-axis. As the immune system and HPA-axis are tightly intertwined around the glucocorticoid receptor (GR) we examined peripheral GR functionality in the EpiPath cohort, where participants had either been exposed to ELA (separation from parents and/or institutionalization followed by adoption) (n=40) or had been reared by their biological parents (n=72). Expression of the strict GR target genes FKBP5 and GILZ as well as total and 1F and 1H GR transcripts were similar between groups. Furthermore, there were no differences in GR sensitivity, examined by the effects of dexamethasone on IL6 production in LPS-stimulated whole blood. Although we did not find differences in methylation at the GR 1F exon or promoter region, we identified a region of the GR 1H promoter (CpG 1-9) that showed lower methylation levels in ELA. Peripheral GR signaling was unperturbed in our cohort and the observed immune phenotype does not appear to be secondary to an altered glucocorticoid receptor response to glucocorticoids. To identify signaling pathways that may underlie the ELA immune phenotype, future research should focus on unbiased approaches, such as investigating whole genome methylation profiles. [less ▲]

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See detailA Bayesian framework to identify random parameter fields based on the copula theorem and Gaussian fields: Application to polycrystalline materials
Rappel, Hussein UL; Wu, Ling; Noels, Ludovic et al

in Journal of Applied Mechanics (in press)

For many models of solids, we frequently assume that the material parameters do not vary in space, nor that they vary from one product realization to another. If the length scale of the application ... [more ▼]

For many models of solids, we frequently assume that the material parameters do not vary in space, nor that they vary from one product realization to another. If the length scale of the application approaches the length scale of the micro-structure however, spatially fluctuating parameter fi elds (which vary from one realization of the fi eld to another) can be incorporated to make the model capture the stochasticity of the underlying micro-structure. Randomly fluctuating parameter fields are often described as Gaussian fields. Gaussian fi elds however assume that the probability density function of a material parameter at a given location is a univariate Gaussian distribution. This entails for instance that negative parameter values can be realized, whereas most material parameters have physical bounds (e.g. the Young's modulus cannot be negative). In this contribution, randomly fluctuating parameter fi elds are therefore described using the copula theorem and Gaussian fi elds, which allow di fferent types of univariate marginal distributions to be incorporated, but with the same correlation structure as Gaussian fields. It is convenient to keep the Gaussian correlation structure, as it allows us to draw samples from Gaussian fi elds and transform them into the new random fields. The bene fit of this approach is that any type of univariate marginal distribution can be incorporated. If the selected univariate marginal distribution has bounds, unphysical material parameter values will never be realized. We then use Bayesian inference to identify the distribution parameters (which govern the random fi eld). Bayesian inference regards the parameters that are to be identi fied as random variables and requires a user-defi ned prior distribution of the parameters to which the observations are inferred. For the homogenized Young's modulus of a columnar polycrystalline material of interest in this study, the results show that with a relatively wide prior (i.e. a prior distribution without strong assumptions), a single specimen is su ciffient to accurately recover the distribution parameter values. [less ▲]

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See detailEvery quasitrivial n-ary semigroup is reducible to a semigroup
Couceiro, Miguel; Devillet, Jimmy UL

in Algebra Universalis (in press)

We show that every quasitrivial n-ary semigroup is reducible to a binary semigroup, and we provide necessary and sufficient conditions for such a reduction to be unique. These results are then refined in ... [more ▼]

We show that every quasitrivial n-ary semigroup is reducible to a binary semigroup, and we provide necessary and sufficient conditions for such a reduction to be unique. These results are then refined in the case of symmetric n-ary semigroups. We also explicitly determine the sizes of these classes when the semigroups are defined on finite sets. As a byproduct of these enumerations, we obtain several new integer sequences. [less ▲]

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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 detailLa réintroduction des contrôles frontaliers dans l’Espace Schengen. Réflexions préliminaires pour un agenda de recherche
Evrard, Estelle UL; Sommarribas, Adolfo UL; Nienaber, Birte UL

in Hamez, Grégory; Defays, Jean-Marc (Eds.) Réalités, perceptions et représentations des frontières de l'Union Européenne (in press)

This articles analyses the potential impact of closed borders or the re-establishing of border checks on the Greater Region - especially in Luxembourg.

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See detailSuicide Prevention: Using the Number of Health Complaints as an Indirect Alternative for Screening Suicidal Adolescents
Heinz, Andreas UL; Catunda, Carolina UL; van Duin, Claire UL et al

in Journal of Affective Disorders (in press)

Background: Suicide is the second leading cause of death in adolescents. Screening for persons at risk usually includes asking about suicidal ideation, which is considered inappropriate in some societies ... [more ▼]

Background: Suicide is the second leading cause of death in adolescents. Screening for persons at risk usually includes asking about suicidal ideation, which is considered inappropriate in some societies and situations. To avoid directly addressing suicide, this paper investigates whether the Health Behaviour in School-aged Children Symptom Checklist (HBSC-SCL), a validated non-clinical measure of eight subjective health complaints (e.g. headache, feeling low), could be used as a tool for screening suicidal ideation and behavior in adolescents. Methods: 5262 secondary school students aged 12-18 answered the Luxembourgish HBSC 2014 survey, including the HBSC-SCL items and suicidal ideation and behavior questions. Results: Each HBSC-SCL item correlates with suicidal ideation and behavior. A sum score was calculated ranging from zero to eight health complaints to predict respondents who considered suicide (area under the ROC curve = .770). The ideal cut-off for screening students who consider suicide is three or more health complaints: sensitivity is 66.3%, specificity is 75.9% and positive predictive value is 32.9%. Limitations: One limitation is HBSC-SCL's low positive predictive value. This is a general problem of screening rare events: the lower the prevalence, the lower the positive predictive value. Sensitivity and specificity could be improved by taking age-, gender- and country-specific cut-off values, but such refinements would make the score calculation more complicated. Conclusions: The HBSC-SCL is short, easy to use, with satisfactory screening properties. The checklist can be used when suicide cannot be addressed directly, and also in a more general context, e.g. by school nurses when screening adolescents. [less ▲]

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See detailStereotypen hinsichtlich Schülern mit sonderpädagogischem Förderbedarf: Lehrerüberzeugen, -erwartungen und –gefühle
Pit-Ten Cate, Ineke UL; Krischler, Mireille UL

in Glock, Sabine; Kleen (Eds.) Stereotype in der Schule (in press)

Dieses Kapitel geht der Frage nach, ob Lehrerüberzeugungen und –erwartungen, je nach sonderpädagogischem Förderbedarf variieren. Außerdem wurde deren Einfluss sowohl auf die Gefühle bei Auseinandersetzung ... [more ▼]

Dieses Kapitel geht der Frage nach, ob Lehrerüberzeugungen und –erwartungen, je nach sonderpädagogischem Förderbedarf variieren. Außerdem wurde deren Einfluss sowohl auf die Gefühle bei Auseinandersetzung mit der Inklusion von unterschiedlichen Schüler*innen, als auch auf die persönliche Bereitschaft Inklusion umzusetzen, untersucht. Die Studien basieren einerseits auf dem Dualen Prozessmodel der sozialen Kognition und betrachten andererseits das Stereotype-Content-Modell, laut dem Wärme und Kompetenz über 80% der Unterschiedlichkeiten in der Personenwahrnehmung erklären. Die Ergebnisse zeigten, dass Überzeugungen und Erwartungen von dem Typ von Förderbedarf beeinflusst werden. Positivere Überzeugungen bezüglich der Schülermerkmale (Wärme und Kompetenz) und höhere Leistungserwartungen waren hierbei mit positiveren Gefühlen und einer stärker ausgeprägten persönlichen Bereitschaft, die Schüler*innen mit sonderpädagogischem Förderbedarf zu inkludieren, verbunden. Abschließend werden die daraus resultierenden Konsequenzen für die Lehreraus- und -weiterbildung abgeleitet und diskutiert. [less ▲]

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See detailAkademische Profile von Schüler*innen zur Bestimmung der Akkuratheit von Schulübergangsempfehlungen – eine Validierungsstudie
Pit-Ten Cate, Ineke UL; Hörstermann, Thomas UL

in Glock, Sabine; Kleen, Hannah (Eds.) Stereotype in der Schule (in press)

In verschiedenen europäischen Ländern führt der Wechsel zur Sekundarschule zu einer bedeutsamen Aufgliederung der Bildungswege, welche ein unterschiedlich hohes Schulleistungsniveau der Schüler*innen ... [more ▼]

In verschiedenen europäischen Ländern führt der Wechsel zur Sekundarschule zu einer bedeutsamen Aufgliederung der Bildungswege, welche ein unterschiedlich hohes Schulleistungsniveau der Schüler*innen voraussetzen. Die Akkuratheit der Zuweisung von Sekundarschulformen bestimmt nicht nur die Optionen der Schüler*innen bei späteren Übergangen im Bildungssystem, sondern beeinflusst auch den weiteren beruflichen und persönlichen Werdegang der Schüler*innen. Schüler*innen mit Migrationshintergrund sind auf die höheren sekundären Schulformen unterrepräsentiert. Inwiefern diese Unterrepräsentation auf stereotypgeprägte Leistungserwartungen zurückzuführen ist, ist bis jetzt unklar, denn es lisgt kein Kriterium vor, um die Urteilsakkuratheit adäquat zu messen. In diesem Kapitel wird ein Ansatz beschrieben, ein solches Akkuratheitskriterium zu entwickeln und zu validieren. In einem zweiten Schritt wird das Kriterium angewendet, um den Zusammenhang zwischen stereotypgeprägten Erwartungen und der Akkuratheit der Übergangsentscheidungen zu untersuchen. Das Kriterium erweist sich als valides Maß und könnte so einen wertvollen Ansatz für weitere Untersuchungen der Akkuratheit von Lehrerurteilen darstellen. Obwohl Lehrer*innen im Allgemeinen eine hohe Urteilsakkuratheit aufweisen, bestätigen die Befunde dennoch die Zusammenhänge zwischen stereotypgeprägten Erwartungen und Urteilsverzerrungen. [less ▲]

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See detailDie Einstellungen von Lehrpersonen gegenüber Schüler*innen ethnischer Minoritäten und Schüler*innen mit sonderpädagogischem Förderbedarf: Ein Forschungsüberblick
Glock, Sabine; Kleen, Hannah; Krischler, Mireille UL et al

in Glock, Sabine; Kleen, Hannah (Eds.) Stereotype in der Schule (in press)

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See detailA material and component bank to facilitate material recycling and component reuse for a sustainable construction: concept and preliminary study
Cai, Gaochuang; Waldmann, Danièle UL

in Clean Technologies and Environmental Policy (in press)

This paper concerns the reusable components and recycled materials from demounted structures 16 which may draw a large amount of waste in construction industry. By a series of literature review 17 and ... [more ▼]

This paper concerns the reusable components and recycled materials from demounted structures 16 which may draw a large amount of waste in construction industry. By a series of literature review 17 and analyses, a material and component bank was proposed to manage more effectively the 18 recycling of materials and direct reuse of components even of whole components obtained from 19 old structures to facilitate a more sustainable construction industry. The concept, main businesses 20 and work operation of the bank were illustrated in detail including its potential management 21 method and supply chain. The relationship between the bank and current building information 22 modelling, design for deconstruction, supply chain and life cycle assessment based on the bank 23 were then analysed in detail. It can be concluded that the bank could pave the way for effectively 24 performing a further and repaid reuse of components and perfecting current recycling of materials 25 to contribute a more sustainable built environment from the view of various terms mentioned in 26 this study. The bank also can link with current method of life cycle assessment or environmental 27 impact assessment well, which all can promote the construction sustainability indicating the bank 28 can be integrated into current construction industry easily for the future. [less ▲]

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See detailAssessing Task-orientation Potential in Primary Science Textbooks: Toward a New Approach
Andersen, Katja Natalie UL

in Journal of Research Science in Teaching (in press)

Task orientation is currently a prominent concept under discussion in primary school di-dactics. It focuses on tasks along which pupils acquire competences on distinct levels of compe-tence. The ... [more ▼]

Task orientation is currently a prominent concept under discussion in primary school di-dactics. It focuses on tasks along which pupils acquire competences on distinct levels of compe-tence. The qualitative empirical study ANONYMOUS pursues the question which conception of task orientation is present in current textbooks in primary science education. The study follows two foci: (i) the introduction of a new category system for the analysis of the task-orientation potential of tasks, based on the further development of existing category systems for analyzing tasks; and (ii) the analysis of 994 task statements in science textbooks with respect to the di-dactic quality of their task orientation. The sample included nine primary science textbooks, four from Germany and five from Luxembourg. Textbooks were selected from the most fre-quently sold series in the respective country. All tasks of the textbooks were analyzed deduc-tively and inductively by four coders in three steps: (i) identifying tasks with task-oriented po-tential; (ii) itemizing different types of task-orientation potential; and (iii) comparing the text-books with respect to country- and period-specific manifestations of task orientation. Analysis indicated that (i) there are few tasks which meet the criteria of task orientation; (ii) distinct types of task orientation can be generated, among which implicit forms dominate; and (iii) dif-ferences occur in the characteristics of task orientation between older and newer textbooks as well as between German and Luxembourgish ones. Central points of discussion ensue from this: the need to develop models for social and cognitive activation for tasks, challenges for school management and professional development for teachers, and support for pupils—in particular high achieving heterogenization. [less ▲]

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See detailThe Role of Commercial Radio Stations in the Media Vacuum of Mai 68 in Paris
Legay, Richard UL

in VIEW Journal of European Television History and Culture (in press)

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See detailRadio beyond Boundaries: An Introduction
Legay, Richard UL; Hochscherf, Tobias; Wagner, Hedwig

in Historical Journal of Film, Radio and Television (in press)

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See detailChildhood trauma affects stress-related interoceptive accuracy
Schaan, Violetta UL; Schulz, André UL; Rubel, Julian A. et al

in Frontiers in Psychiatry (in press)

Early life adversity (ELA) may cause permanent disturbances in brain-body signaling. These disturbances are thought to contribute to physical symptoms and emotional dysregulation in adulthood. The current ... [more ▼]

Early life adversity (ELA) may cause permanent disturbances in brain-body signaling. These disturbances are thought to contribute to physical symptoms and emotional dysregulation in adulthood. The current study investigated the effects of childhood trauma on young adults’ interoceptive accuracy as an indicator of brain-body communication that may be dysregulated by ELA. Sixty-six participants completed an online-questionnaire followed by a laboratory session including the socially-evaluated cold pressor stress test during which ECG, salivary cortisol and interoceptive accuracy were assessed. Childhood trauma was negatively related to interoceptive accuracy (IAc) after the stressor. This stress-effect could not be observed for heart rate and cortisol, which were unrelated to IAc. Participants reporting higher baseline unpleasantness exhibited lower IAc after the stressor, while increases in unpleasantness due to the stressor were associated with higher IAc. Unpleasantness at baseline mediated the effect of childhood trauma on IAc after the stressor. [less ▲]

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See detailSouth Africa’s incomplete transition towards socio-economic justice: A case study on inequality and populism
Owiso, Owiso UL; Boshoff, Elsabé

in Diritti Umani e Diritto Internazionale (in press)

South Africa is currently one of the world’s most unequal countries, with massive income inequality, millions of people living in poverty without access to basic services and amenities, unemployment rates ... [more ▼]

South Africa is currently one of the world’s most unequal countries, with massive income inequality, millions of people living in poverty without access to basic services and amenities, unemployment rates consistently above 20% and the top 10% of the population receiving two thirds of the total income. Government economic policies on poverty reduction in the decades since the advent of democracy in South Africa in 1994 have been unable to eradicate the extreme racialised inequality which was the basis of the 342 years of colonialism and apartheid which were characterised by systematic dispossession and socio-economic marginalisation of South Africa’s majority Black population and the systematic privileging of the minority White population. While this history is not the primary focus of this paper, it nonetheless provides useful context. The paper’s primary focus is on the more recent normative and legal challenges of post-1994 South Africa that have resulted in further entrenching socio-economic inequality and contributing to the rise of populism. In this paper we argue that the dire living conditions of a large proportion of the population and disillusionment with the State’s ability to deliver on its promises in this regard, along with the poor implementation of social and economic rights have led to the development of a populist culture in South African politics. [less ▲]

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