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See detailLiving in the Shadow of the Past: Financial Profiles and Well-Being
d'ambrosio, Conchita UL; Clark, Andrew; Zhu, Rong

in Scandinavian Journal of Economics (in press)

We here consider the link between individual financial profiles over time and well-being, as measured by life satisfaction. We in particular look at annual self-reported financial worsening and ... [more ▼]

We here consider the link between individual financial profiles over time and well-being, as measured by life satisfaction. We in particular look at annual self-reported financial worsening and improvement information for over 25,000 individuals in Australian panel data from 2002 to 2017. We first find that satisfaction falls (rises) with a contemporaneous major financial worsening (improvement), with the the largest correlation being with financial worsening. Second, the experience of these financial events in the past continues to be linked to current well-being. Last, only the order of financial-improvement spells relates to well-being: a given number of past years where finances deteriorated has the same association with current well-being whether the deterioration occurred in one continuous spell or was interrupted. We last show that these associations are heterogeneous over the distribution of well-being. [less ▲]

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See detailBeam-inside-beam contact: Mechanical simulations of slender medical instruments inside the human body
Magliulo, Marco UL; Lengiewicz, Jakub UL; Zilian, Andreas UL et al

in Computer Methods and Programs in Biomedicine (in press)

Background and Objective. This contribution presents a rapid computational framework to mechanically simulate the insertion of a slender medical instrument in a tubular structure such as an artery, the ... [more ▼]

Background and Objective. This contribution presents a rapid computational framework to mechanically simulate the insertion of a slender medical instrument in a tubular structure such as an artery, the cochlea or another slender instrument. Methods. Beams are employed to rapidly simulate the mechanical behaviour of the medical instrument and the tubular structure. However, the framework’s novelty is its capability to handle the mechanical contact between an inner beam (representing the medical instrument) embedded in a hollow outer beam (representing the tubular structure). This "beam-insidebeam" contact framework, which forces two beams to remain embedded, is the first of its kind since existing contact frameworks for beams are "beam-to-beam" approaches, i.e. they repel beams from each other. Furthermore, we propose contact kinematics such that not only instruments and tubes with circular cross-sections can be considered, but also those with elliptical cross-sections. This provides flexibility for the optimization of patient-specific instruments. Results. The results demonstrate that the framework’s robustness is substantial, because only a few increments per simulation and a few iterations per increment are required, even though large deformations, large rotations and large curvature changes of both the instrument and tubular structure occur. The stability of the framework remains high even if the modulus of the inner tube is thousand times larger than that of the outer tube. A mesh convergence study furthermore exposes that a relatively small number of elements are required to accurately approach the reference solution. Conclusions. The framework’s high simulation speed originates from the exploitation of the rigidity of the beams’ cross-sections to quantify the exclusion between the inner and the hollow outer beam. This rigidity limits the accuracy of the framework at the same time, but this is unavoidable since simulation accuracy and simulation speed are two competing interests. Hence, the framework is particularly attractive if simulation speed is preferred over accuracy. [less ▲]

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See detailHybrid User Pairing for Spectral and Energy Efficiencies in Multiuser MISO-NOMA Networks with SWIPT
Nguyen, Toan-Van; Nguyen, van Dinh UL; Costa, Daniel Benevides Da et al

in IEEE Transactions on Communications (in press)

In this paper, we propose a novel hybrid user pairing (HUP) scheme in multiuser multiple-input single-output nonorthogonal multiple access networks with simultaneous wireless information and power ... [more ▼]

In this paper, we propose a novel hybrid user pairing (HUP) scheme in multiuser multiple-input single-output nonorthogonal multiple access networks with simultaneous wireless information and power transfer. In this system, two information users with distinct channel conditions are optimally paired while energy users perform energy harvesting (EH) under non-linearity of the EH circuits. We consider the problem of jointly optimizing user pairing and power allocation to maximize the overall spectral efficiency (SE) and energy efficiency (EE) subject to userspecific quality-of-service and harvested power requirements. A new paradigm for the EE-EH trade-off is then proposed to achieve a good balance of network power consumption. Such design problems are formulated as the maximization of nonconcave functions subject to the class of mixed-integer non-convex constraints, which are very challenging to solve optimally. To address these challenges, we first relax binary pairing variables to be continuous and transform the design problems into equivalent non-convex ones, but with more tractable forms. We then develop low-complexity iterative algorithms to improve the objectives and converge to a local optimum by means of the inner approximation framework. Simulation results show the convergence of proposed algorithms and the SE and EE improvements of the proposed HUP scheme over state-of-the-art designs. In addition, the effects of key parameters such as the number of antennas and dynamic power at the BS, target data rates, and energy threshold, on the system performance are evaluated to show the effectiveness of the proposed schemes in balancing resource utilization. [less ▲]

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See detailThe ABCD of cyclic quadrilaterals
Begalla, Engjell UL; Perucca, Antonella UL

Article for general public (in press)

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See detailNon-problematic and problematic binge-watchers do not differ on prepotent response inhibition: A preregistered pilot experimental study
Flayelle, Maèva; Verbruggen, Frederick; Schiel, Julie et al

in Human Behavior and Emerging Technologies (in press)

Binge‐watching (i.e., watching multiple episodes of a TV series back‐to‐back) has become standard viewing practice. Yet, this phenomenon has recently generated concerns regarding its potential negative ... [more ▼]

Binge‐watching (i.e., watching multiple episodes of a TV series back‐to‐back) has become standard viewing practice. Yet, this phenomenon has recently generated concerns regarding its potential negative outcomes on the long run. The presumed addictive nature of this behavior has also received increasing scientific interest, with preliminary findings reporting associations between binge‐watching, self‐control impairments, and heightened impulsivity. Nevertheless, previous studies only relied on self‐report data. The current preregistered study therefore investigated whether non‐problematic and problematic binge‐watchers differ not only in self‐report but also in experimental measures of behavioral impulsivity. Based on their viewing characteristics, 60 TV series viewers were allocated to one of three predetermined groups: non‐binge‐watchers, trouble‐free binge‐watchers (absence of negative impact) and problematic binge‐watchers (presence of negative impact). Participants performed tasks assessing response inhibition (Stop‐Signal Task) and impulsive reward seeking (Delay Discounting Task), and completed self‐reported questionnaires on sociodemographics, affect, symptoms of problematic binge‐watching, and impulsive personality traits. According to the preregistered analytic plan, one‐way analyses of covariance (ANCOVAs) were computed to compare the predetermined groups. With gender being controlled for, no differences were identified in self‐report impulsivity and response inhibition abilities. Trouble‐free binge‐watchers reported higher rates of delay discounting than non‐binge‐watchers. Although preliminary, our results challenge the notion that problematic binge‐watching is characterized by the same neuropsychological impairments as in addictive disorders as, contrary to our preregistered hypotheses, no differences emerged between non‐problematic and problematic binge‐watchers regarding self‐control variables considered as hallmarks of the latter. These results suggest the need for formulating and testing alternative conceptualizations of problematic binge‐watching. [less ▲]

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See detailPredictive and interpretable models via the stacked elastic net
Rauschenberger, Armin UL; Glaab, Enrico UL; van de Wiel, Mark

in Bioinformatics (in press)

Motivation: Machine learning in the biomedical sciences should ideally provide predictive and interpretable models. When predicting outcomes from clinical or molecular features, applied researchers often ... [more ▼]

Motivation: Machine learning in the biomedical sciences should ideally provide predictive and interpretable models. When predicting outcomes from clinical or molecular features, applied researchers often want to know which features have effects, whether these effects are positive or negative, and how strong these effects are. Regression analysis includes this information in the coefficients but typically renders less predictive models than more advanced machine learning techniques. Results: Here we propose an interpretable meta-learning approach for high-dimensional regression. The elastic net provides a compromise between estimating weak effects for many features and strong effects for some features. It has a mixing parameter to weight between ridge and lasso regularisation. Instead of selecting one weighting by tuning, we combine multiple weightings by stacking. We do this in a way that increases predictivity without sacrificing interpretability. Availability and Implementation: The R package starnet is available on GitHub: https://github.com/rauschenberger/starnet. [less ▲]

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See detailProblematic online sexual activities in men: The role of self‐esteem, loneliness, and social anxiety
Wéry, Aline; Canale, Natale; Bell, Caroline et al

in Human Behavior and Emerging Technologies (in press)

Several studies have shown that problematic use of online sexual activities (OSAs) can constitute a dysfunctional coping strategy that reflects a compensatory usage of the Internet. Yet, some specific ... [more ▼]

Several studies have shown that problematic use of online sexual activities (OSAs) can constitute a dysfunctional coping strategy that reflects a compensatory usage of the Internet. Yet, some specific risk factors—widely investigated in the field of general problematic Internet use—have to date been scarcely studied within the context of OSA. Hence, the goal of this study was to test a theoretical model in which self‐esteem, loneliness, and social anxiety are hypothesized to predict the type of OSAs favored and their potential addictive use. To this end, an online survey was conducted in a sample of self‐selected men who used OSAs on a regular basis (N = 209). Results showed that low self‐esteem is positively associated with loneliness and high social anxiety, which were in turn positively related to involvement in two specific OSAs: use of pornography and the search for online sexual contacts. Higher engagement in these OSA activities was related to symptoms of addictive usage. These findings underline the importance in psychological interventions of taking into account the specific OSA practiced to improve self‐esteem and to reduce loneliness and symptoms of social anxiety [less ▲]

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See detailTaxation in matching markets
Dupuy, Arnaud UL; Galichon, Alfred; Jaffe, Sonia et al

in International Economic Review (in press)

We analyze the effects of taxation in two-sided matching markets where agents have heterogeneous preferences over potential partners. Our model provides a continuous link between models of matching with ... [more ▼]

We analyze the effects of taxation in two-sided matching markets where agents have heterogeneous preferences over potential partners. Our model provides a continuous link between models of matching with and without transfers. Taxes generate inefficiency on the allocative margin, by changing who matches with whom. This allocative inefficiency can be non-monotonic, but is weakly increasing in the tax rate under linear taxation if each worker has negative non-pecuniary utility of working. We adapt existing econometric methods for markets without taxes to our setting, and estimate preferences in the college-coach football market. We show through simulations that standard methods inaccurately measure deadweight loss. [less ▲]

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See detailSimultaneous Diagonalization of Incomplete Matrices and Applications
Coron, Jean-Sébastien UL; Notarnicola, Luca UL; Wiese, Gabor UL

Scientific journal (in press)

We consider the problem of recovering the entries of diagonal matrices {U_a}_a for a = 1, . . . , t from multiple “incomplete” samples {W_a}_a of the form W_a = P U_a Q, where P and Q are unknown matrices ... [more ▼]

We consider the problem of recovering the entries of diagonal matrices {U_a}_a for a = 1, . . . , t from multiple “incomplete” samples {W_a}_a of the form W_a = P U_a Q, where P and Q are unknown matrices of low rank. We devise practical algorithms for this problem depending on the ranks of P and Q. This problem finds its motivation in cryptanalysis: we show how to significantly improve previous algorithms for solving the approximate common divisor problem and breaking CLT13 cryptographic multilinear maps. [less ▲]

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See detailArticle 47 of the Charter in the Opinion procedure
Neframi, Eleftheria UL

in European Papers (in press)

This paper affirms that external relations are outside the scope of Article 47 of the Charter. This does not however mean that the principle of judicial protection and the right of access to an ... [more ▼]

This paper affirms that external relations are outside the scope of Article 47 of the Charter. This does not however mean that the principle of judicial protection and the right of access to an independent tribunal have only an internal EU law dimension. In Opinion 1/17, The Court of Justice could assess the CETA’s compatibility with the right of access to an independent tribunal without having recourse to Article 47 of the Charter, on the ground either of the principle of autonomy or of the compatibility with the substantive provisions of the common commercial policy. This paper argues that while judicial protection as part of the autonomy claim could meet some conceptual limits, promoting judicial protection as part of the common commercial policy could reinforce the perception that the Union is a credible and influential actor in international trade and in international procedural law. [less ▲]

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See detailIntegrating Topological Proofs with Model Checking to Instrument Iterative Design
Menghi, Claudio UL; Rizzi, Alessandro Maria; Bernasconi, Anna

in Proceedings of the 23rd International Conference on Fundamental Approaches to Software Engineering, FASE 2020 (in press)

System development is not a linear, one-shot process. It proceeds through refinements and revisions. To support assurance that the system satisfies its requirements, it is desirable that continuous ... [more ▼]

System development is not a linear, one-shot process. It proceeds through refinements and revisions. To support assurance that the system satisfies its requirements, it is desirable that continuous verification can be performed after each refinement or revision step. To achieve practical adoption, formal verification must accommodate continuous verification efficiently and effectively. Model checking provides developers with information useful to improve their models only when a property is not satisfied, i.e., when a counterexample is returned. However, it is desirable to have some useful information also when a property is instead satisfied. To address this problem we propose TOrPEDO, an approach that supports verification in two complementary forms: model checking and proofs. While model checking is typically used to pinpoint model behaviors that violate requirements, proofs can instead explain why requirements are satisfied. In our work, we introduce a specific notion of proof, called Topological Proof. A topological proof produces a slice of the original model that justifies the property satisfaction. Because models can be incomplete, TOrPEDO supports reasoning on requirements satisfaction, violation, and possible satisfaction (in the case where satisfaction depends on unknown parts of the model). Evaluation is performed by checking how topological proofs support software development on 12 modeling scenarios and 15 different properties obtained from 3 examples from literature. Results show that: (i) topological proofs are ≈60% smaller than the original models; (ii) after a revision, in ≈78% of cases, the property can be re-verified by relying on a simple syntactic check. [less ▲]

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See detailHealth politics in Luxembourg
Leist, Anja UL

in Immergut, E.; Anderson, K.; Devitt, C. (Eds.) et al Health politics in Europe: A handbook (in press)

The edited volume is coordinated in the framework of the Norface project HEALTHDOX (https://www.norface.net/project/healthdox/).

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See detailMigration and Urbanity in Rural Areas. Developments in the German-Luxembourg Border Region
Boesen, Elisabeth UL; Schnuer, Gregor; Wille, Christian UL

in Weber, Florian; Wille, Christian; Caesar, Beate (Eds.) et al Geographien der Grenzen. Räume – Ordnungen – Verflechtungen (in press)

Studies on the connection between migration and urbanity are usually concerned with conditions and developments in cities. The presence of ‘urbanity’ in rural space is the topic of the present ... [more ▼]

Studies on the connection between migration and urbanity are usually concerned with conditions and developments in cities. The presence of ‘urbanity’ in rural space is the topic of the present contribution. It will be discussed using the example of residential migration in the Greater Region SaarLorLux. The massive influx of residential migrants from Luxembourg into the border regions of the neighbouring countries is a relatively recent phenomenon, the main cause of which lies in the developments in the real-estate market in the Grand Duchy of Luxembourg. This phenomenon is of special interest for the topic of migration in rural areas in two regards: because of the important demographic changes produced by the residential migrants in individual border villages and because of the complex composition of the group of residential migrants, which is extremely differentiated regarding the dimension rural – urban. Central to the article is the question, whether urban attitudes and practices become visible in German border villages, and, if so, how the migratory movement from Luxembourg influences this ‘rural urbanity’. Furthermore, taking the everyday practices of the residential migrants as starting point, it asks in how far the dichotomy urbanity - rurality presents a conceptual approach for the examination of individual and structural integration processes. [less ▲]

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See detailIdentities and Methodologies of Border Studies: Recent Empirical and Conceptual Approaches
Wille, Christian UL; Gerst, Dominik; Krämer, Hannes

in Borders in Perspective (in press)

In recent decades, Border Studies have gained importance and have seen a noticeable increase in development. This manifests itself in an increased institutionalization, a differentiation of the areas of ... [more ▼]

In recent decades, Border Studies have gained importance and have seen a noticeable increase in development. This manifests itself in an increased institutionalization, a differentiation of the areas of research interest and a conceptual reorientation that is interested in examining processes. So far, however, little attention has been paid to questions about (inter)disciplinary self-perception and methodological foundations of Border Studies and the associated consequences for research activities. This thematic issue addresses these desiderata and brings together articles that deal with their (inter)disciplinary foundations as well as method(olog)ical and practical research questions. The authors also provide sound insights into a disparate field of work, disclose practical research strategies, and present methodologically sophisticated systematizations. [less ▲]

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See detailBorder Studies: a long-overdue self-examination
Wille, Christian UL; Gerst, Dominik; Krämer, Hannes

in Borders in Perspective (in press)

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See detailAutomating System Test Case Classification and Prioritization for Use Case-Driven Testing in Product Lines
Hajri, Ines UL; Göknil, Arda UL; Pastore, Fabrizio UL et al

in Empirical Software Engineering (in press)

Product Line Engineering (PLE) is a crucial practice in many software development environments where software systems are complex and developed for multiple customers with varying needs. At the same time ... [more ▼]

Product Line Engineering (PLE) is a crucial practice in many software development environments where software systems are complex and developed for multiple customers with varying needs. At the same time, many development processes are use case-driven and this strongly influences their requirements engineering and system testing practices. In this paper, we propose, apply, and assess an automated system test case classification and prioritization approach specifically targeting system testing in the context of use case-driven development of product families. Our approach provides: (i) automated support to classify, for a new product in a product family, relevant and valid system test cases associated with previous products, and (ii) automated prioritization of system test cases using multiple risk factors such as fault-proneness of requirements and requirements volatility in a product family. Our evaluation was performed in the context of an industrial product family in the automotive domain. Results provide empirical evidence that we propose a practical and beneficial way to classify and prioritize system test cases for industrial product lines. [less ▲]

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See detailLa coopération transfrontalière comme formation de pratiques. Perspectives pour une approche de recherche alternative
Wille, Christian UL; Connor, Ulla UL

in Dziub (Ed.) Le Transfrontalier, pratiques et représentations (in press)

In order to achieve our objective, we will first provide an overview of the development of cooperation research, its characterizing orientations and establish a link to the topic of this contribution ... [more ▼]

In order to achieve our objective, we will first provide an overview of the development of cooperation research, its characterizing orientations and establish a link to the topic of this contribution (chapter 2). The following presentation of practice theories introduces praxeo-logical thinking and provides a condensed outline of the state of the art of this cultural soci-ological theory (chapter 3). Building on this, we will develop our idea of a cross-border practice formation that breaks with the premises of traditional cooperation research, and we provide an alternative perspectivation by outlining four challenges of CBC (chapter 4). In consideration of some research-practical particularities which are linked to the suggested analytical perspective, we eventually offer (chapter 5) an outlook on the development of an alternative research approach which is compatible within a multidisciplinary context. [less ▲]

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See detailAnalysing border geographies in times of COVID-19
Wille, Christian UL; Weber, Florian

in Mein, Georg; Pause, Johannes (Eds.) Self and Society in the Corona Crisis. Perspectives from the Humanities and Social Sciences (in press)

When a new type of coronavirus was first reported in China in December 2019, it was not yet clear how rapidly and in what a short time frame COVID-19 would affect the entire world. In January 2020, Wuhan ... [more ▼]

When a new type of coronavirus was first reported in China in December 2019, it was not yet clear how rapidly and in what a short time frame COVID-19 would affect the entire world. In January 2020, Wuhan, the capital of Hubei, was quarantined and just two months later, the virus had spread to Central Europe; a subsequent wave of infections followed in many places, including the United States. As a result, presumed certainties began to erode: freedom of movement was restricted, entry restrictions were imposed and, paradoxically, precisely 25 years after the Schengen Agreement came into force, many EU internal borders were closed. This article focuses on these border closings, but also deals with drawing social boundaries in the wake of the pandemic. Thus, the border geographies examined range from the subject level to the global level and will be put into context with the security measures that have been introduced, the orderings and ordinances used, political re-nationalization reflexes and civil society resistance. The article ends with an outlook of some additional topics and questions from the perspective of Border Studies with and after the COVID-19 pandemic. [less ▲]

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See detailAn AI-assisted Approach for Checking the Completeness of Privacy Policies Against GDPR
Torre, Damiano UL; Abualhaija, Sallam UL; Sabetzadeh, Mehrdad UL et al

in in Proceedings of the 28th IEEE International Requirements Engineering Conference (RE’20) (in press)

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See detailEntwicklungslinien der Border Studies und Zugänge zu Geographien der Grenzen
Weber, Florian; Wille, Christian UL; Caesar, Beate et al

in Weber, Florian; Wille, Christian; Caesar, Beate (Eds.) et al Geographien der Grenzen. Räume – Ordnungen – Verflechtungen (in press)

Die Border Studies haben seit den 1990er Jahren einen tiefgreifenden Wandel durchlaufen, der die Beschäftigung mit Grenz(ziehung)en als unhinterfragte Gegebenheiten relativiert hat. Die Neuorientierung ... [more ▼]

Die Border Studies haben seit den 1990er Jahren einen tiefgreifenden Wandel durchlaufen, der die Beschäftigung mit Grenz(ziehung)en als unhinterfragte Gegebenheiten relativiert hat. Die Neuorientierung stützt sich auf konstruktivistische Zugänge und fragt nach den Prozessen der Einsetzung, Relativierung, Verschiebung oder Überwindung von Grenzen. Diesem Verständnis von Grenzen als politische, soziale, kulturelle, mentale Produktionen folgt dieser Sammelband und diskutiert den Zusammenhang von Räumen, Ordnungen und Verflechtungen. Die Herausgeber*innen führen in diesem Beitrag grundlegend in das Themenfeld ein und geben einen Überblick über die Beiträge des Bandes. Die Autor*innen aus den Raum-, Sozial- und Kulturwissenschaften wählen unterschiedliche Zugänge zu Grenzen und analysieren ihre (Re-)Produktionsprozesse als ‚Geographien der Grenzen‘. Dabei rücken sie auch andere als nationalstaatliche Grenzen in den Blick, wie zum Beispiel stadtlandhybride Differenzierungen. So wird in diesem Band aus verschiedenen theoretischen und thematischen Blickwinkeln der Frage nachgegangen, wie und welche ,Geographien der Grenzen‘ sich im Zusammenspiel von unterschiedlichen Destabilisierungen und (Re-)Stabilisierungen von Grenzen (re)konstruieren lassen. [less ▲]

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