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See detailArbeitslosigkeit für Lehrabgänger problematisch
Sacchi, Stefan; Shi, Lulu P.; Imdorf, Christian et al

in Die Volkswirtschaft (in press)

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See detailSchulische Inklusion in Deutschland, Luxemburg und der Schweiz: Aktuelle Bedingungen und Herausforderungen
Powell, Justin J W UL; Hadjar, Andreas UL

in Rathmann, Katharina; Hurrelmann, Klaus (Eds.) Leistung und Wohlbefinden in der Schule: Herausforderung Inklusion (in press)

Die hohe und gestiegene Bedeutung Inklusiver Bildung – für Individuen und Gesellschaften gleichermaßen – wird global, national, regional und lokal von verschiedensten Akteurinnen und Akteuren ... [more ▼]

Die hohe und gestiegene Bedeutung Inklusiver Bildung – für Individuen und Gesellschaften gleichermaßen – wird global, national, regional und lokal von verschiedensten Akteurinnen und Akteuren hervorgehoben sowie zunehmend auch wissenschaftlich multidisziplinär diskutiert. Inklusive schulische Bildung wird hinsichtlich der Merkmale des Zugangs und der Anwesenheit, der Beteiligung am Unterricht sowie der Teilhabe in Schulaktivitäten sowie in Bezug auf die Lernleistung, respektive deren Zertifizierung, bewertet. Aber auch Aspekte wie Wohlbefinden, Gleichstellung und soziale Integration werden zunehmend thematisiert. Der globale Diskurs um Inklusive Bildung als Menschenrecht geht über die Schulbildung hinaus und betrachtet auch die Hochschulbildung sowie lebenslanges Lernen. Inter- wie intranational werden vergleichende Analysen und Länderberichte immer wichtiger, um den Stand der schulischen Inklusion, der individuellen Verwirklichungschancen sowie der gesellschaftlichen Teilhabe von benachteiligten und behinderten Menschen zu messen. Innerhalb der räumlichen Vielfalt der inklusiven Bildung und sonderpädagogischer Fördersysteme finden sich vielfältige Barrieren, aber auch Katalysatoren inklusiver Bildungsreformen. Die Institutionalisierung sonderpädagogischer Fördersysteme in den deutschsprachigen Ländern, insbesondere über die zweite Hälfte des 20. Jahrhunderts, als isolierten eigenständigen und differenzierten Teil des Bildungssystems, stellt heutige Ziele inklusiver Bildungsreformen vor große Herausforderungen. In den drei hier untersuchten Ländern stellt Deutschland das differenzierteste und auch am stärksten segregierte System dar, dann folgt die Schweiz mit einem eher separativen Modell innerschulischer Differenzierung und schließlich Luxemburg als im Vergleich kleinstes Land, das aufgrund der spät begonnenen Etablierung von Sondereinrichtungen und seiner Kleinteiligkeit und seiner relativ hohen Schuldichte vergleichsweise günstige Ausgangsbedingungen für schulische Integration darstellt, allerdings – wie die beiden anderen Länder auch – durch die Mehrgliedrigkeit des Schulsystems und räumliche Segregation durch teilweise homogenisierte Lernumwelten gekennzeichnet ist. [less ▲]

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See detailPrecise estimates of gaming-related harm should guide regulation of gaming
Starcevic, Vladan; Billieux, Joël UL

in Journal of Behavioral Addictions (in press)

Regulation of gaming is largely based on the perception of gaming-related harm. This perception varies from one country to another and does not necessarily correspond to the real gaming-related harm. It ... [more ▼]

Regulation of gaming is largely based on the perception of gaming-related harm. This perception varies from one country to another and does not necessarily correspond to the real gaming-related harm. It is argued that there is a crucial need to define and assess domains of this harm in order to introduce policies that regulate gaming. Such policies would ideally be targeted at individuals at risk for problematic gaming and would be based more on educational efforts than on restrictive measures. The role of gaming industry in the regulation of gaming would depend on the more precise estimates of gaming-related harm. [less ▲]

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See detailInforming a social practice theory framework with social-psychological factors for analyzing routinized energy consumption: A multivariate analysis of three practices
Hess, Ann-Kathrin; Samuel, Robin UL; Burger, Paul

in Energy Research & Social Science (in press)

A key factor contributing to the non-realization of energy efficiency potentials is the routinized way in which many energy consumption behaviors (ECBs) are performed. To analyze routinized ECBs, we draw ... [more ▼]

A key factor contributing to the non-realization of energy efficiency potentials is the routinized way in which many energy consumption behaviors (ECBs) are performed. To analyze routinized ECBs, we draw on social practice theory and psychological concepts and suggest a framework that considers individual, social, and material factors. Based on our proposed framework and employing multivariate regression analysis, we gain new insights into associated factors of routinized ECBs—particularly for washing and drying clothes and showering. Analyzing data from a survey conducted among Swiss households in 2016 (n=5015), we find that individual values, practice-specific wants, and materials explain variations in routinized ECB performance. Furthermore, socio-demographic predictors shed light on cultural and status differences associated with routinized ECBs. This paper contributes to understanding associated factors of routinized ECBs by bridging practice theory and psychology-based factors. [less ▲]

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See detailTest Suite Generation with the Many Independent Objective (MIO) Algorithm
Arcuri, Andrea UL

in Information and Software Technology (in press)

Context: Automatically generating test suites is intrinsically a multi-objective problem, as any of the testing targets (e.g, statements to execute or mutants to kill) is an objective on its own. Test ... [more ▼]

Context: Automatically generating test suites is intrinsically a multi-objective problem, as any of the testing targets (e.g, statements to execute or mutants to kill) is an objective on its own. Test suite generation has peculiarities that are quite different from other more regular optimisation problems. For example, given an existing test suite, one can add more tests to cover the remaining objectives. One would like the smallest number of small tests to cover as many objectives as possible, but that is a secondary goal compared to covering those targets in the first place. Furthermore, the amount of objectives in software testing can quickly become unmanageable, in the order of (tens/hundreds of) thousands, especially for system testing of industrial size systems. Objective: To overcome these issues, different techniques have been proposed, like for example the Whole Test Suite (WTS) approach and the Many-Objective Sorting Algorithm (MOSA). However, those techniques might not scale well to very large numbers of objectives and limited search budgets (a typical case in system testing). In this paper, we propose a novel algorithm, called Many Independent Objective (MIO) algorithm. This algorithm is designed and tailored based on the specific properties of test suite generation. Method: An empirical study was carried out for test suite generation on a series of artificial examples and seven RESTful API web services. The \evo system test generation tool was used, where MIO, MOSA, WTS and random search were compared. Results: The presented MIO algorithm resulted having the best overall performance, but was not the best on all problems. Conclusion: The novel presented MIO algorithm is a step forward in the automation of test suite generation for system testing. However, there are still properties of system testing that can be exploited to achieve even better results. [less ▲]

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See detailRandom or Evolutionary Search for Object-Oriented Test Suite Generation?
Shamshiri; Rojas; Gazzola et al

in Software Testing, Verification & Reliability (in press)

An important aim in software testing is constructing a test suite with high structural code coverage – that is, ensuring that most if not all of the code under test has been executed by the test cases ... [more ▼]

An important aim in software testing is constructing a test suite with high structural code coverage – that is, ensuring that most if not all of the code under test has been executed by the test cases comprising the test suite. Several search-based techniques have proved successful at automatically generating tests that achieve high coverage. However, despite the well-established arguments behind using evolutionary search algorithms (e.g., genetic algorithms) in preference to random search, it remains an open question whether the benefits can actually be observed in practice when generating unit test suites for object-oriented classes. In this paper, we report an empirical study on the effects of using evolutionary algorithms (including a genetic algorithm and chemical reaction optimization) to generate test suites, compared with generating test suites incrementally with random search. We apply the EVOSUITE unit test suite generator to 1,000 classes randomly selected from the SF110 corpus of open source projects. Surprisingly, the results show that the difference is much smaller than one might expect: While evolutionary search covers more branches of the type where standard fitness functions provide guidance, we observed that, in practice, the vast majority of branches do not provide any guidance to the search. These results suggest that, although evolutionary algorithms are more effective at covering complex branches, a random search may suffice to achieve high coverage of most object-oriented classes. [less ▲]

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See detailInventory Decisions in the Presence of Strategic Customers: Theory and Behavioral Evidence
Zhang, Yang; Mantin, Benny UL; Wu, Yaozhong

in Production and Operations Management (in press)

We consider the inventory decision of a retailer facing strategic customers. We develop a behavioral theory that accounts for reference dependence, which makes predictions on how the presence of strategic ... [more ▼]

We consider the inventory decision of a retailer facing strategic customers. We develop a behavioral theory that accounts for reference dependence, which makes predictions on how the presence of strategic customers leverages retailer behavior. Specifically, the reference-dependent retailer shall decrease her order quantity when there are more strategic customers in the population. As such, the conventional pull-to-center bias for newsvendor is generalized, since the presence of strategic consumers may induce the retailer to pull her order further below the center even when the production cost is low. Furthermore, increasing proportion of strategic customers reduces the retailer's ordering bias under low cost, yet amplifies it when the cost is high. Our subsequent experiments find pull-below-center effect, validate the theoretical predictions, and establish the asymmetry of reference dependence with the estimated behavioral parameters. We also study extensions to our model and carry out robustness checks of our experimental results. [less ▲]

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See detailDesires and intentions for fatherhood: A comparison of childless gay and heterosexual men in Germany
Kranz, Dirk; Busch, Holger; Niepel, Christoph UL

in Journal of Family Psychology (in press)

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See detailSubtyping attenuated psychotic symptoms: A cluster analytic approach
Laloyaux, Julien; Larøi, Frank; Nuyens, Filip et al

in Journal of Clinical Psychology (in press)

Objective The aim of the present study is to examine the heterogeneity of attenuated psychotic symptoms (PS) and related personality factors using a cluster analytic approach. Method A large sample of ... [more ▼]

Objective The aim of the present study is to examine the heterogeneity of attenuated psychotic symptoms (PS) and related personality factors using a cluster analytic approach. Method A large sample of participants from the general population was evaluated in terms of attenuated symptomatology (psychotic and affective) and two personality factors: encoding style and impulsivity traits. Results Cluster analysis emphasized the existence of five independent clusters: High Psychosis, High Positive, High Negative, High Impulsive-Low Psychosis, and Low Psychosis. Cluster comparisons demonstrated that the personality factors and PS are differentially involved in the clusters. Conclusions The present study demonstrated that reliable and relatively distinct clusters of individuals from the general population can be identified based on established PS and related personality factors. The fact that a variety of profiles was observed contributes to a better understanding of the nature of the heterogeneity characterizing PS and has clear theoretical and clinical implications. [less ▲]

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See detailChallenges in completing EMU: asymmetric competition vs fiscal harmonisation. A case study of the Benelux countries
Danescu, Elena UL

in Journal of Contemporary European Research [=JCER] (2019)

This paper aims to investigate the concept, context and socio-economic consequences of fiscal competition in the integrated economic space of EMU in completion, to pinpoint the positive and negative ... [more ▼]

This paper aims to investigate the concept, context and socio-economic consequences of fiscal competition in the integrated economic space of EMU in completion, to pinpoint the positive and negative factors at work via a case study of the Benelux countries – both founder members of the EU and pioneers of EMU – and to examine the impact on European and international regulations in the field. In particular, it will endeavour to provide a comprehensive interpretation of fiscal policy in the Benelux countries via a comparative approach and from a historical perspective. It will look at the development of respective domestic fiscal policies, driven by national interests and by membership of a Community that is subject to requirements in terms of harmonisation and taxation, but also by constant contact (and frequent clashes) with the multilateral international environment. [less ▲]

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See detailSimultaneous finite element analysis of circuit-integrated piezoelectric energy harvesting from fluid-structure interaction
Ravi, Srivathsan; Zilian, Andreas UL

in Mechanical Systems & Signal Processing (2019), 114

Flow-driven piezoelectric energy harvesting is a strongly coupled multiphysics phenomenon that involves complex three-way interaction between the fluid flow, the electromechanical effect of the ... [more ▼]

Flow-driven piezoelectric energy harvesting is a strongly coupled multiphysics phenomenon that involves complex three-way interaction between the fluid flow, the electromechanical effect of the piezoelectric material mounted on a deformable substrate structure and the controlling electrical circuit. High fidelity computational solution approaches are essential for the analysis of flow-driven energy harvesters in order to capture the main physical aspects of the coupled problem and to accurately predict the power output of a harvester. While there are some phenomenological and numerical models for flow-driven harvesters reported in the literature, a fully three-dimensional strongly coupled model has not yet been developed, especially in the context of flow-driven energy harvesting. The weighted residuals method is applied to establish a mixed integral equation describing the incompressible Newtonian flow, elastic substrate structure, piezoelectric patch, equipotential electrode and attached electric circuit that form the multiphysics fluid-structure interaction problem. A monolithic numerical solution method is derived that provides consistent and simultaneous solution to all physical fields as well as to fluid mesh deformation. The approximate solution is based on a mixed space-time finite element discretization with static condensation of the auxiliary fields. The discontinuous Galerkin method is utilized for integrating the monolithic model in time. The proposed solution scheme is illustrated in the example of a lid driven cavity with a flexible piezoelectric bottom wall, demonstrating quantification of the amount of electrical energy extractable from fluid flow by means of a piezoelectric harvester device. The results indicate that in order to make reliable predictions on the power output under varying operational states, the realization of strong multiphysics coupling is required for the mathematical model as well as the numerical solution scheme to capture the characteristics of flow-driven energy harvesters. [less ▲]

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See detailReductions of elliptic curves
Perucca, Antonella UL

in Proceedings of the Roman Number Theory Association (2019), 4

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See detailStriking a balance between competitiveness and social fairness: what can we expect from the European Pillar of Social Rights?
Muñoz, Susana UL

in Chiocchetti, Paolo; Allemand, Frédéric (Eds.) Competitiveness and Solidarity in the European Union: Interdisciplinary Perspectives (2019)

The solemnly proclaimed European Pillar of Social Rights provides a meaningful response to the process of building a deeper, fairer European Union in the aftermath of the crisis. This chapter aims to ... [more ▼]

The solemnly proclaimed European Pillar of Social Rights provides a meaningful response to the process of building a deeper, fairer European Union in the aftermath of the crisis. This chapter aims to provide a critical assessment of the nature, scope, rationale, purpose, content and effectiveness of the Pillar in the light of its potential contribution to foster social fairness and competitiveness in the EU. The Pillar complements and develops the EU’s social acquis and reinforces standards which may provide a fairer and more socially-balanced competitiveness in the EU. Progress has been made, but further efforts are needed to build a sense of common purpose to strengthen the social foundations of the Union. [less ▲]

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See detailPierre Werner and Europe: The Family Archives Behind the Werner Report.
Danescu, Elena UL

Book published by Palgrave Macmillan (2018)

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See detailSocial Change for Sustainable Localized Food Sovereignty. Convergence between Prosumers and Ethical Entrepreneurs.
Reckinger, Rachel UL

in Sociologia del Lavoro (2018), 152(4),

Recently, some resourceful community-driven initiatives for local food production and retail have arisen in Luxembourg, where low organic agricultural rates are paradoxically paired with high consumer ... [more ▼]

Recently, some resourceful community-driven initiatives for local food production and retail have arisen in Luxembourg, where low organic agricultural rates are paradoxically paired with high consumer demands. This niche of social innovators is combining agro-ecology with circular economy practices. Four cases of alternative food networks are of interest – studied with qualitative interviews and participant observation. One has been established since the 1980s with 200 employees, partly in social insertion measures. The more recent and smaller initiatives are characterized by a cooperative governance, a community-supported agricultural outlook, hands-on workshops and time-banks, all enabled by social media. These initiatives are more radical in their agro-ecological or permaculture practices, focusing on regenerative land use without relying on imports and fostering the integration of consumers with varying degrees of prosumer involvement, as a politicized step further than mere (possibly industrialized) organic production. [less ▲]

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See detailEducational assessment and its prospects in the 21st century
Greiff, Samuel UL

Speeches/Talks (2018)

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See detailSmall States in the European Union : Luxembourg
Danescu, Elena UL

in Hartly, Cathy (Ed.) WESTERN EUROPE 2019 (2018)

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See detailAssessment of the suitability of gravel wash mud as raw material for the synthesis of an alkali-activated binder
Thapa, Vishojit Bahadur UL; Waldmann, Danièle UL; Wagner, Jean-Frank et al

in Applied Clay Science (TOP10 Journal in Mineralogy) (2018), 161(C), 110-118

Gravel wash mud (GWM), a waste product from gravel mining was dried and processed into a fine powder to be activated by different concentrations of sodium hydroxide (NaOH) solutions for the synthesis of ... [more ▼]

Gravel wash mud (GWM), a waste product from gravel mining was dried and processed into a fine powder to be activated by different concentrations of sodium hydroxide (NaOH) solutions for the synthesis of an alkali-activated binder. The GWM powders were thermally treated at five different calcination temperatures 550, 650, 750, 850 and 950°C. The characterisation of the raw material comprises the particle size distribution (PSD) by laser granulometry, the chemical and mineralogical composition by X-ray fluorescence and X-ray diffraction analysis respectively, and simultaneous thermal analysis. The performance of the alkali-activated binders was examined using compression strength tests and the microstructure was observed using scanning electron microscopy (SEM). The GWM was classified as an aluminosilicate raw material with kaolinite and illite as main clay minerals. Furthermore, a mean particle size around 6.50μm was determined for the uncalcined and calcined GWM powders. The SEM images of the developed binders showed the formation of a compact microstructure, however, relatively low strengths were achieved. This preliminary study highlights an example of an aluminosilicate prime material, which shows very promising chemical and mineralogical characteristics, but its suitability for alkaline activation without further additives was not confirmed as far as performance-based criteria are considered. [less ▲]

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