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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 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 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 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 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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See detailEspaces de frontière. Penser et analyser la frontière en tant qu’espace
Wille, Christian UL

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

This paper examines how practice-theoretical considerations can be linked with those of a spatial-theoretical nature and translated into a heuristic of spatial analysis from a cultural studies perspec ... [more ▼]

This paper examines how practice-theoretical considerations can be linked with those of a spatial-theoretical nature and translated into a heuristic of spatial analysis from a cultural studies perspec-tive. This question focus results from the understanding that space should be regarded as an emer-gent aspect of the social and that it is still largely insufficiently defined in Border Studies. Drawing on a number of different spatial concepts, the paper first presents an action-theoretical notion of space and reformulates it in a practice-theoretical framework. It constitutes the point of departure for the development of the spaces of the border model with its analytical categories of social practices, practical knowledge as well as physical-material and social-structural aspects. The diversity of con-nections between these analytical categories have proven to be heuristically particularly useful. [less ▲]

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See detailMapping Legal Innovation: Trends and Perspectives
Robinson, Gavin UL; Masson, Antoine

Book published by Springer (in press)

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See detailSword, Shield and Cloud: Toward a European System of Public-Private Orders for Electronic Evidence in Criminal Matters?
Ligeti, Katalin UL; Robinson, Gavin UL

in Mitsilegas, Valsamis; Vavoula, Niovi (Eds.) Surveillance and Privacy in the Digital Age: European, Transatlantic and Global Perspectives (in press)

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See detailPre-Hurricane Consumer Stockpiling and Post- Hurricane Product Availability: Empirical Evidence from Natural Experiments
Pan, Xiaodan; Dresner, Martin; Mantin, Binyamin UL et al

in Production and Operations Management (in press)

The provision of essential supplies is a key service provided by retailers when demand spikes due to consumer stockpiling during environmental emergencies. Moreover, it is important for retailers to ... [more ▼]

The provision of essential supplies is a key service provided by retailers when demand spikes due to consumer stockpiling during environmental emergencies. Moreover, it is important for retailers to quickly recover from these events by replenishing the stock of essential supplies to meet the continuing needs of local residents. The main purpose of this research is to study consumer precautionary stockpiling behavior prior to the onset of hurricane landfalls and determine the impact of this behavior on in-store product availability for various formats of retail store outlets. Specifically, we focus on the bottled water product category, an essential emergency category in hurricane preparedness. This study combines an event analysis methodology with econometric models using archival retail scanner data from 60 U.S. retail chains located in 963 counties and real-time data from four recent U.S. continental hurricanes. We find that supply-side characteristics (retail network and product variety), demand-side characteristics (hurricane experience and household income), and disaster characteristics (hazard proximity and hazard intensity) significantly affect consumer stockpiling propensity as the hurricanes approach. The increased consumer stockpiling has immediate and longer-term impacts on retail operations, namely, in-store product availability. Among various retail formats, drug stores are associated with the highest consumer stockpiling propensity before hurricanes, while dollar stores and discount stores are associated with the lowest in-store product availability following hurricanes. Our study points to the need for retailers and policymakers to carefully monitor factors affecting consumer stockpiling behavior that will allow for better allocation of critical supplies during the hurricane season. [less ▲]

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See detailUnemployment at 50+: economic and psychosocial consequences
Murdock, Elke UL; Filbig, Marceline; Borges Neves, Rita

in Wanka, Anna; Walsh, Kieran; Scharf, Thomas (Eds.) et al Social Exclusion in Later Life: Interdisciplinary and Policy Perspectives. International Perspectives on Aging (in press)

Throughout the lifespan, unemployment has severe consequences in terms of economic exclusion, and overall social exclusion, but is compounded in older age. Within the EU, a growing number of older adults ... [more ▼]

Throughout the lifespan, unemployment has severe consequences in terms of economic exclusion, and overall social exclusion, but is compounded in older age. Within the EU, a growing number of older adults (50+) are affected by joblessness. Job loss at a later stage in a professional career may determine an early and permanent exit from the labour market with significant psychosocial consequences. Herein lies the age-specific risk for older unemployed adults: once becoming unemployed they are at greater risk at staying unemployed. As a result, older unemployed people may face income cuts, deprivation of a central adulthood role and their mental and physical health may suffer. In this chapter, we draw attention to the latent functions of work, and the psychosocial consequences of job loss in later life. Applying a life-course perspective, the aim of this chapter is to explore how job loss can be framed as a form of acute economic exclusion, and how this exclusion can have significant implications for poor mental health. In a context of rising retirement ages, and the lack of preparedness of the labour market to deal with an ageing workforce, it is essential to understand these dynamics to guide policy development. [less ▲]

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See detailResource Allocation for Energy Efficiency in OFDMA-Enabled WPCN
Nguyen, Tien-Tung; Pham, Quoc-Viet; Nguyen, van Dinh UL et al

in IEEE Wireless Communications Letters (in press)

This letter considers a wireless powered communication network (WPCN), where an energy-constrained device directly uses harvested energy from a power transfer source to transmit independent signals to ... [more ▼]

This letter considers a wireless powered communication network (WPCN), where an energy-constrained device directly uses harvested energy from a power transfer source to transmit independent signals to multiple Internet of Things (IoT) users using orthogonal frequency division multiple access (OFDMA). Our goal is to maximize the system energy efficiency (EE) by jointly optimizing the duration of energy harvesting (EH), subcarrier and power allocation. The formulated problem is a mixed integer nonlinear programming (MINLP) problem due to the presence of binary assignment variables, and thus it is very challenging to solve it directly. By leveraging Dinkelbach method, a very efficient iterative algorithm with closed-form solutions in each iteration is developed, where its convergence is guaranteed. Numerical results show that the proposed algorithm obtains a fast convergence and outperforms baseline algorithms. Notably, they also reveal that the power source should transmit its maximum allowable power to obtain the optimal EE performance. [less ▲]

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See detailLeveraging Natural-language Requirements for Deriving Better Acceptance Criteria from Models
Veizaga Campero, Alvaro Mario UL; Alferez, Mauricio UL; Torre, Damiano UL et al

in Proceedings of 23rd ACM / IEEE International Conference on Model Driven Engineering Languages and Systems (MODELS) (in press)

In many software and systems development projects, analysts specify requirements using a combination of modeling and natural language (NL). In such situations, systematic acceptance testing poses a ... [more ▼]

In many software and systems development projects, analysts specify requirements using a combination of modeling and natural language (NL). In such situations, systematic acceptance testing poses a challenge because defining the acceptance criteria (AC) to be met by the system under test has to account not only for the information in the (requirements) model but also that in the NL requirements. In other words, neither models nor NL requirements per se provide a complete picture of the information content relevant to AC. Our work in this paper is prompted by the observation that a reconciliation of the information content in NL requirements and models is necessary for obtaining precise AC. We perform such reconciliation by devising an approach that automatically extracts AC-related information from NL requirements and helps modelers enrich their model with the extracted information. An existing AC derivation technique is then applied to the model that has now been enriched by the information extracted from NL requirements. Using a real case study from the financial domain, we evaluate the usefulness of the AC-related model enrichments recommended by our approach. Our evaluation results are very promising: Over our case study system, a group of five domain experts found 89% of the recommended enrichments relevant to AC and yet absent from the original model (precision of 89%). Furthermore, the experts could not pinpoint any additional information in the NL requirements which was relevant to AC but which had not already been brought to their attention by our approach (recall of 100%) [less ▲]

Detailed reference viewed: 130 (12 UL)