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See detailSecurity – Visible, Yet Unseen? How Displaying Security Mechanisms Impacts User Experience and Perceived Security
Distler, Verena UL; Zollinger, Marie-Laure UL; Lallemand, Carine UL et al

in Proceedings of ACM CHI Conference on Human Factors in Computing Systems (CHI2019) (2019, April)

An unsolved debate in the field of usable security concerns whether security mechanisms should be visible, or blackboxed away from the user for the sake of usability. However, tying this question to ... [more ▼]

An unsolved debate in the field of usable security concerns whether security mechanisms should be visible, or blackboxed away from the user for the sake of usability. However, tying this question to pragmatic usability factors only might be simplistic. This study aims at researching the impact of displaying security mechanisms on user experience (UX) in the context of e-voting. Two versions of an e-voting application were designed and tested using a between-group experimental protocol (N=38). Version D displayed security mechanisms, while version ND did not reveal any security-related information. We collected data on UX using standardised evaluation scales and semi-structured interviews. Version D performed better overall in terms of UX and need fulfilment. Qualitative analysis of the interviews gives further insights into factors impacting perceived security. Our study adds to existing research suggesting a conceptual shift from usability to UX and discusses implications for designing and evaluating secure systems. [less ▲]

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See detailCurvature based DAD-method for damage localisation under consideration of measurement noise minimisation
Erdenebat, Dolgion UL; Waldmann, Danièle UL; Teferle, Felix Norman UL

in Engineering Structures (2019), 181

Several research projects on condition assessment of bridges have proven that structural responses from dynamic excitation or static loading are influenced by local damages and thus, could be used for the ... [more ▼]

Several research projects on condition assessment of bridges have proven that structural responses from dynamic excitation or static loading are influenced by local damages and thus, could be used for the detection and localisation of damages. Particularly, the curvature of structures is directly depending on their stiffness. In order to localise the discontinuities in curvature lines resulting from damage, this paper uses the so-called Deformation Area Difference Method (DAD), which is based on static load deflection tests on bridge structures. The DAD-method for damage localisation is presented within the paper using a theoretical example, which is then verified by two laboratory experiments. The first experiment consists of a reinforced concrete beam, which is loaded stepwise until failure of the concrete in the compression zone. Due to the load increase, the tensile zone of the beam starts cracking, leading to a stiffness reduction. The application of the DAD-method allows identifying the cracked area from the measurement of the deflection line. However, a challenge and a prerequisite for the applicability of the DAD-method is the highly accurate measurement of the deflection line. Therefore, one of the most modern measurement techniques such as digital photogrammetry is applied. Nonetheless, the accuracy of each measurement technique is limited. The second laboratory experiment consists of a steel beam, which is locally damaged at three positions. The degree of the damage is stepwise increased in order to identify at which degree of damage the applied DAD-method is still able to identify and localise damage. In this work, the focus lies on the minimisation of the effect of noise resulting from the limited measurement precision. Possible solutions were examined and proposed based on methods such as data smoothing using polynomial regression, consideration of standard deviation and measurement point variation. The reduction of the noise effect leads to an increase in the sensitivity of the damage localisation. The DAD-method has proven its potential for practical application through the successful localisation of cracking in the concrete beam. [less ▲]

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See detailPromoting multilingualism and multiliteracies through storytelling: a case-study on the use of the app iTEO in preschools in Luxembourg
Kirsch, Claudine UL

in Breuer, Esther; Lindgren, E; Stavans, A (Eds.) et al Multilingual Literacy (2019)

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See detailTraffic Management and Networking for Autonomous Vehicular Highway Systems
Rubin, Izhak; Baiocchi, Andrea; Sunyoto, Yulia et al

in Ad Hoc Networks (2019), 83

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See detailThe TNF Family of Ligands and Receptors: Communication Modules in the Immune System and Beyond
Dostert, Catherine; Grustat, M.; Letellier, Elisabeth UL et al

in Physiological Reviews (2019), 99(1),

The tumor necrosis factor (TNF) and TNF receptor (TNFR) superfamilies (TNFSF/TNFRSF) include 19 ligands and 29 receptors that play important roles in the modulation of cellular functions. The ... [more ▼]

The tumor necrosis factor (TNF) and TNF receptor (TNFR) superfamilies (TNFSF/TNFRSF) include 19 ligands and 29 receptors that play important roles in the modulation of cellular functions. The communication pathways mediated by TNFSF/TNFRSF are essential for numerous developmental, homeostatic, and stimulus-responsive processes in vivo. TNFSF/TNFRSF members regulate cellular differentiation, survival, and programmed death, but their most critical functions pertain to the immune system. Both innate and adaptive immune cells are controlled by TNFSF/TNFRSF members in a manner that is crucial for the coordination of various mechanisms driving either co-stimulation or co-inhibition of the immune response. Dysregulation of these same signaling pathways has been implicated in inflammatory and autoimmune diseases, highlighting the importance of their tight regulation. Investigation of the control of TNFSF/TNFRSF activities has led to the development of therapeutics with the potential to reduce chronic inflammation or promote anti-tumor immunity. The study of TNFSF/TNFRSF proteins has exploded over the last 30 yr, but there remains a need to better understand the fundamental mechanisms underlying the molecular pathways they mediate to design more effective anti-inflammatory and anti-cancer therapies. [less ▲]

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See detailMethodological Aspects of Software Engineering, Assurance, Quality, and Reliability Engineering (MAS/AQR) 2019 Welcome from the Minitrack Co-Chairs
Tenbergen, Bastian; Ries, Benoît UL

in Proceedings of the 52nd Hawaii International Conference on System Sciences (HICSS) (2019, January)

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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 detailWhy is it so hard? And for whom? Obstacles to intra-European mobility
Kmiotek-Meier, Emilia Alicja UL; Skrobanek, Jan; Nienaber, Birte UL et al

in Migration Letters (2019)

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See detailAssessing binge-watching behaviors: Development and validation of the “Watching TV Series Motives” and “Binge-Watching Engagement and Symptoms” questionnaires
Flayelle, Maèva UL; Canale, Natale; Vögele, Claus UL et al

in Computers in Human Behavior (2019), 90

The widespread practice of binge-watching (i.e. watching multiple episodes of a TV series in one session) recently generated concerns about associated negative outcomes. Its psychological investigation ... [more ▼]

The widespread practice of binge-watching (i.e. watching multiple episodes of a TV series in one session) recently generated concerns about associated negative outcomes. Its psychological investigation, however, remains fragmentary. Based on the previous phenomenological investigation of TV series watching, we developed and validated two original assessment instruments, assessing TV series watching motives and binge-watching engagement and symptoms, respectively. Preliminary items were created for each questionnaire, and a focus group with TV series viewers was conducted and analyzed to generate the final instruments. The questionnaires were then administered via an online survey (N=6556), together with complementary measures of affect, problematic Internet use and substance use. Exploratory and confirmatory factor analyses, along with correlational analyses, were performed to examine both structural and external validity of the scales. The factorial analyses resulted in a 4-factor model (i.e. emotional enhancement, enrichment, coping-escapism and social) for the Watching TV Series Motives Questionnaire (WTSMQ), and in a 7-factor model (i.e. engagement, positive emotions, desire-savoring, pleasure preservation, binge-watching, dependency and loss of control) for the Binge-Watching Engagement and Symptoms Questionnaire (BWESQ). The results suggest good psychometric properties for both scales. The current study thus provides theoretically-driven and psychometrically sound instruments for further research on binge-watching behaviors [less ▲]

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See detailSchulische Kontexte, Schulentfremdung und Bildungsarmut
Hadjar, Andreas UL; Scharf, Jan; Grecu, Alyssa Laureen UL

in Quenzel, Gudrun; Hurrelmann, Klaus (Eds.) Handbuch Bildungsarmut (2019)

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See detailThe role of planning in complex problem solving
Eichmann, Beate; Goldhammer, Frank; Greiff, Samuel UL et al

in Computers & Education (2019), 128

Complex problem solving (CPS) is a highly transversal competence needed in educational and vocational settings as well as everyday life. The assessment of CPS is often computer-based, and therefore ... [more ▼]

Complex problem solving (CPS) is a highly transversal competence needed in educational and vocational settings as well as everyday life. The assessment of CPS is often computer-based, and therefore provides data regarding not only the outcome but also the process of CPS. However, research addressing this issue is scarce. In this article we investigated planning activities in the process of complex problem solving. We operationalized planning through three behavioral measures indicating the duration of the longest planning interval, the delay of the longest planning interval and the variance of intervals between each two successive interactions. We found a significant negative average effect for our delay indicator, indicating that early planning in CPS is more beneficial. However, we also found effects depending on task and interaction effects for all three indicators, suggesting that the effects of different planning behaviors on CPS are highly intertwined. [less ▲]

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See detailLa juridictionnalisation du droit dans l’espace OHADA
Menetrey, Séverine UL

in Penant (2019)

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See detailLe principe de juridiction dans une perspective comparatiste
Menetrey, Séverine UL

in Les principes directeurs du procès et les racines européennes de la pensée de Motulsky (2019)

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See detailReview of Elizabeth Guffey (2018). Designing Disability: Symbols, Space and Society.
Powell, Justin J W UL

in Design Issues (2019)

In her pathbreaking book Designing Disability: Symbols, Space and Society, Elizabeth Guffey provides vital insights into decades of social and design processes that ultimately produced the most ubiquitous ... [more ▼]

In her pathbreaking book Designing Disability: Symbols, Space and Society, Elizabeth Guffey provides vital insights into decades of social and design processes that ultimately produced the most ubiquitous symbol of disability—and accessibility—worldwide: The International Symbol of Access (ISA). Building on existing scholarship from a range of disciplines coupled with original historical research, this book uncovers the origins and evolving (largely transatlantic) architectural and design discourse, and several moments of serendipity, that led to its creation. The ISA has since diffused to become part of the built environment in all corners of the world. Richly illustrated and charting at times vitriolic debates, protest activities, and artistic interventions up to the contemporary era, Guffey weaves together activist and aesthetic perspectives into a tapestry of social and design history relating to disability and accessibility. Structured in historical phases, the book’s chapters progress across larger and shorter stretches over more than a century of wheelchair design, social and welfare policies and programs (mostly in the US, UK, and Scandinavia), architectural standards, and symbols relating to barriers and accessibility measures. Guffey engages the reader in what is necessarily a multidisciplinary, multilevel investigation, with unexpected twists and turns. On one level, the book focuses on the politics of highest office, with US Presidents Franklin D. Roosevelt and Dwight D. Eisenhower (who permanently or temporarily used wheelchairs) sketched against the backdrop of the lack of accessible government buildings in Washington, DC, and the social consensus then to hide impairment for fear of stigmatization (shifted marginally by disabled Veterans). On another level, welfare state provisions in the US, UK, and Scandinavia are discussed in light of progressive legislation and the persistent challenges of implementation. Finally, at ground level, the utmost significance of individuals devoted to universal design writ large becomes manifestly evident. Guffey recounts how, in US universities, inspirational figures such as Timothy Nugent (at Illinois), Ron Mace (at North Carolina State), and Viktor Papanek (at Purdue, CalArts, Kansas, etc.), campus planners, and students designed and constructed new worlds on the drawing board and poured in concrete. We follow design professionals, such as architect Selwyn Goldsmith in the UK, who was a strident arbiter of accessibility. Academic initiatives went hand-in-fist with advocacy activities in organizations and protest and artistic actions in the streets. Indeed, to raise general awareness of the ever-present attitudinal and structural barriers—institutionalized discrimination—that disabled people face daily and to secure disability rights, disability protests and cross-national organizing have repeatedly been necessary. The long and bumpy road to universal design extends into the future. Integral to this history of design development, revision, and critiques of various symbols of disability have been international events (world expositions, Olympics & Paralympics) and organizations (Rehabilitation International), artistic inspiration, design competitions, and guerilla art interventions. Tracing the convoluted process of designing what would become the ISA—fifty years ago now—leads to Susanne Koefoed, a Danish design student, and Karl Montan, leader of the Swedish Institute for the Handicapped, but also to international negotiations and chance. The on-going questioning of the official ISA, especially, its “misfit” nature as an amalgam of technical aid and person, emphasizes the shift from invisibility to ubiquity of disability via social change and political activism as well as cultural representations and the need for signs of identity. In the new century, newer initiatives in the US, such as Brendan Murphy’s and the Accessible Icon Project (developed by Sara Hendren and Brian Glenney), have challenged the official ISA, revealing both persistence and change in understandings of disability and accessibility. When integrated into signage, the ISA designates accessible spaces and facilities. If the ISA has become present in public buildings and spaces everywhere, cultural notions of disability and access remain understudied across the social sciences, with especially the Global South remaining a blank page. Research is needed to chart the diverse local interpretations that mirror shifts from exclusion to inclusion of disabled people as the human rights revolution witnessed since the end of WWII continues, but also suffers backlash, even in the Global North. Paradoxically, this global icon refers simultaneously to disability, and its ameliorating factor, accessibility. Yet, the ambivalence and debate surrounding the ISA persist, as Guffey emphasizes especially in the later chapters, focusing on proposed alternatives to the existing ISA, codified as it is in law and conforming to the guidelines of the International Organization for Standardization (ISO). Until universal design (and the universalizing social policies likely needed to support it) succeeds in reducing the barriers in environments and in attitudes and in maximizing the usefulness of products and services during the design stage, identity formation processes are among the most positive aspects of the ISA. The icon’s influence and implementation extend far beyond marking modifications to the built environment. Whether taken-for-granted, modified or critiqued, the current ISA has spread globally. It can now be found wherever people move in physical space, finding their way. The symbol testifies to the on-going shift from exclusion, along a slow and winding road, to social inclusion and full participation of disabled people. In sum, Guffey brings scholarship on the ISA to the next stage. It complements studies that chart the influence of disabled peoples’ organizations and of international organizations as they facilitated remarkable shifts in disability paradigms. Yet institutionalized discrimination abounds, with the ISA marking that accessibility and universal design are far from achieved. If a few imprecisions tarnish the literature list, this historical work reconstructing a largely Western process cannot be faulted for not providing a complete global analysis of ISA implementation and adjustment. In that vein, with contributions from Guffey herself, the current exhibition “Viktor Papanek: The Politics of Design” (Kries, Klein & Clarke, 2018) indeed extends the discussion to the Global South and across further disciplines, rightfully embedding the dialogue about symbols of disability and enhancing access within broader contexts. Footnote: Kries, Matteo, Amelie Klein & Alison J. Clarke (eds.) (2018). Viktor Papanek: The Politics of Design. Weil am Rhein, Germany: Vitra Design Museum. ISBN: 978-3-945852-26-2. The exhibition is currently on view at Germany’s Vitra Design Museum (20 September 2018–10 March 2019), then at Barcelona Design Museum (20 October 2019–2 February 2020). [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 detailSprachliche Voraussetzungen
Kirsch, Claudine UL

in Kiel, Ewald; Herzig, Bardo; Maier, Uwe (Eds.) et al Handbuch Unterrichten in allgemeinbildenden Schulen (2019)

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See detailEin Experiment kollektiver Gewissensprüfung. Situativer Opportunismus und kumulative Heroisierung
Fickers, Andreas UL; Brüll, Christoph UL

in Quadflieg, Peter M.; Lejeune, Carlo; Brüll, Christoph (Eds.) Grenzerfahrungen. Eine Geschichte der Deutschsprachigen Gemeinschaft Belgiens. Vol. 4: Staatenwechsel, Identitätskonflikte, Kriegserfahrungen (1919-1945) (2019)

Geschichte wird anhand von Quellen unterschiedlicher Herkunft erzählt und interpretiert. Die Fragen der Historiker entwickeln sich auch auf Grundlage ihrer verinnerlichten familiären Erzählungen über ... [more ▼]

Geschichte wird anhand von Quellen unterschiedlicher Herkunft erzählt und interpretiert. Die Fragen der Historiker entwickeln sich auch auf Grundlage ihrer verinnerlichten familiären Erzählungen über erlebte Geschichte. Kann diese Perspektive und ihre Konfrontation mit der archivalischen Überlieferung neue Sichtweisen auf die Vergangenheit ermöglichen? Wie können Historiker das Konzept des situativen Opportunismus nutzen, um die Entscheidungen der Zeitgenossen zu verstehen? Ein Denkanstoß. [less ▲]

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See detailTrait emotional intelligence and problematic online behaviors among adolescents: The mediating role of mindfulness, rumination, and depression
Kircaburun, Kagan; Griffiths, Mark D.; Billieux, Joël UL

in Personality and Individual Differences (2019), 139

Preliminary studies have shown that trait emotional intelligence (trait EI) can be a risk factor for higher problematic use of specific online activities. However, the possible mediating role of ... [more ▼]

Preliminary studies have shown that trait emotional intelligence (trait EI) can be a risk factor for higher problematic use of specific online activities. However, the possible mediating role of mindfulness and rumination on the relationship of trait EI with problematic social media use (PSMU) and problematic online gaming (POG) is unclear. Among a sample of 470 adolescents, the present study examined the direct and indirect associations of trait EI with PSMU and POG and the potential mediational role of mindfulness, rumination, and depression while controlling for gender and age. Multiple mediation analyses indicated that trait EI was indirectly associated with PSMU via mindfulness, rumination, and depression, and with POG via mindfulness and rumination. Furthermore, rumination affected PSMU positively. The study provides empirical evidence of the theoretical assumption that different types of specific problematic online behaviors are related to both shared and specific risk factors. [less ▲]

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