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See detailH wie Heimat
Heimböckel, Dieter UL

Article for general public (2012)

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See detailh- and p-adaptivity driven by recovery and residual-based error estimators for PHT-splines applied to time-harmonic acoustics
Videla, Javier; Anitescu, Cosmin; Khajah, Tahsin et al

in Computers and Mathematics with Applications (2018), 77(9), 2369-2395

In this work, we demonstrate the application of PHT-splines for time-harmonic acoustic problems, modeled by the Helmholtz equation. Solutions of the Helmholtz equation have two features: global ... [more ▼]

In this work, we demonstrate the application of PHT-splines for time-harmonic acoustic problems, modeled by the Helmholtz equation. Solutions of the Helmholtz equation have two features: global oscillations associated with the wave number and local gradients caused by geometrical irregularities. We show that after a sufficient number of degrees of freedom is used to approximate global oscillations, adaptive refinement can capture local features of the solution. We compare residual-based and recovery-based error estimators and investigate the performance of -refinement. The simulations are done in the context of recently introduced Geometry Independent Field approximaTion (GIFT), where PHT-splines are only used to approximate the solution, while the computational domain is parameterized with NURBS. This approach builds on the natural adaptation ability of PHT-splines and avoids the re-parameterization of the NURBS geometry during the solution refinement process. [less ▲]

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See detailH-infinity Adaptive Observer Design and Parameter Identification for a Class of Nonlinear Fractional-Order Systems
N'Doye, Ibrahima; Voos, Holger UL; Laleg-Kirati, Taous-Meriem et al

in 53rd IEEE Conference Decision and Control, CDC’14, Los Angeles, USA, 15-17 Dec. 2014 (2014, December)

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See detailH-infinity dynamic observer design for linear time invariant systems
Gao, Nan; Darouach, Mohamed; Voos, Holger UL et al

in 2014 IEEE 53rd Annual Conference on Decision and Control (CDC), Los Angeles, USA (2014, December)

This paper proposes an H-infinity dynamic observer (DO) for a class of linear time invariant (LTI) systems in the presence of disturbances. It generalizes the existing results on the proportional observer ... [more ▼]

This paper proposes an H-infinity dynamic observer (DO) for a class of linear time invariant (LTI) systems in the presence of disturbances. It generalizes the existing results on the proportional observer (PO), the proportional integral observer (PIO) and the DO. The design method is derived from a new formulation of linear matrix inequality (LMI), based on the solutions of the algebraic constraints obtained from the unbiasedness conditions of the estimation error. A numerical example is provided to show the applicability and performances of our observer. [less ▲]

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See detailH-infinity Static Output Feedback Control for a Fractional-Order Glucose-Insulin System
Ndoye, Ibrahima UL; Voos, Holger UL; Darouach, Mohamed et al

in 6th Workshop on Fractional Differentiation and Its Applications. Part of 2013 IFAC Joint Conference SSSC, TDS and FDA (2013), Grenoble, February 4-6, 2013 (2013)

This paper presents the H-infinity static output feedback control of nonlinear fractional-order glucose-insulin systems. In this paper, it is an attempt to incorporate fractional-order into the ... [more ▼]

This paper presents the H-infinity static output feedback control of nonlinear fractional-order glucose-insulin systems. In this paper, it is an attempt to incorporate fractional-order into the mathematical minimal model of glucose-insulin system dynamics and it is still an interesting challenge to show, how the order of a fractional di erential system a ects the dynamics of system in the presence of meal disturbance. A static output feedback control is considered for the problem. Su fficient conditions are derived in terms of linear matrix inequalities (LMIs) formulation by using the fractional Lyapunov direct method where the fractional-order \alpha belongs to 0<\alpha<1. Finally, numerical simulations are carried out to illustrate our proposed results and show that the nonlinear fractional-order glucose-insulin systems are as stable as their integer-order counterpart in the presence of exogenous glucose infusion or meal disturbance. [less ▲]

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See detailH2 Norm Based Network Volatility Measures
Huang, Qingqing; Yuan, Ye; Goncalves, Jorge UL et al

in The proceedings of the American Control Conference (2014)

Motivated by applications in biology and economics, we propose new volatility measures based on the H2 system norm for linear networks stimulated by independent or correlated noise. We identify critical ... [more ▼]

Motivated by applications in biology and economics, we propose new volatility measures based on the H2 system norm for linear networks stimulated by independent or correlated noise. We identify critical links in a network, where relatively small improvements can lead to large reductions in network volatility measures. We also examine volatility measures of individual nodes and their dependence on the topological position in the network. Finally, we investigate the dependence of the volatility on different network interconnections, weights of the edges and other network properties. Hence in an intuitive and efficient way, we can identify critical links, nodes and interconnections in network which can shed light in the network design to make it more robust. [less ▲]

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See detailH2-Based Network Volatility Measures
Goncalves, Jorge UL; Huang, Qingqing; Yuan, Ye et al

in American Control Conference (2014, June)

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See detailH2020 PROJECT CEASEVAL. Evaluation of the Common European Asylum System under Pressure and Recommendations for Further Development
Nienaber, Birte UL; Vianelli, Lorenzo UL; Paraschivescu, Claudia UL et al

Poster (2018)

Within CEASEVAL, the University of Luxembourg leads Work Package 4 (WP4) on “Borders and the Mobility of Migrants”. The aim of WP4 is to develop a framework to analyse the interactions between borders and ... [more ▼]

Within CEASEVAL, the University of Luxembourg leads Work Package 4 (WP4) on “Borders and the Mobility of Migrants”. The aim of WP4 is to develop a framework to analyse the interactions between borders and the mobility of migrants (asylum seekers, refugees and irregular migrants), thus also addressing the relation between asylum systems and Schengen regime. In order to do so, WP4 investigates the functioning of the internal and external EU borders in the governance of migrants’ mobility by looking specifically at the ways in which bordering processes are implemented when confronted with the mobility of migrants. The research draws from an extensive empirical study in 7 different countries: France, Germany, Greece, Hungary, Luxembourg, Spain and Turkey. Qualitative interviews with migrants (asylum seekers, refugees and irregular migrants) and institutional actors (border agents, policymakers, representatives of institutions, etc.), as well as ethnographic observations of border agencies and border points are conducted in these case studies. The objectives of this qualitative fieldwork are to identify mobility trajectories, understand how these are shaped by border policies, and compare bordering processes. The work package will result in 7 country reports (one for each case study), a comparative report, a policy brief, and an online interactive map. [less ▲]

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See detailH_∞ decentralized dynamic-observer-based control design for large-scale nonlinear intercon-nected systems
Gao, Nan; Darouach, Mohamed; Alma, Marouane et al

in Transaction on IoT and Cloud Computing (2014), 2(3), 46-66

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See detailHaben die 'neuen Medien' die Öffentlichkeit zerstört? : Ein Versuch zur Differenzierung
Kohns, Oliver UL

Article for general public (2019)

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See detailHaben die Frauen die Luxemburger Monarchie gerettet? Diskurse über Frauen im Kontext der Einführung des Frauenwahlrechts
Wagener, Renée UL

in Frieseisen, Claude; Moes, Régis; Polfer, Michel (Eds.) et al Le suffrage universel au Luxembourg et en Europe. Actes du colloque du 27/28 janvier 2020 à la Chambre des Députés (2021)

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See detailHabenula deep brain stimulation for refractory bipolar disorder.
Zhang, Chencheng; Kim, Seung-Goo; Li, Dianyou et al

in Brain stimulation (2019)

Bipolar disorder (BD) is a mood disorder associated with significant morbidity and mortality. In many cases, BD can be managed with pharmacotherapy, psychological therapy, or electroconvulsive therapy [1 ... [more ▼]

Bipolar disorder (BD) is a mood disorder associated with significant morbidity and mortality. In many cases, BD can be managed with pharmacotherapy, psychological therapy, or electroconvulsive therapy [1]. For some afflicted patients, however, BD is a chronic and severely disabling condition that is resistant to the aforementioned treatments. Deep brain stimulation (DBS) offers a safe and effective neurosurgical treatment for otherwise refractory movement disorders and obsessive-compulsive disorder [2,3]. [less ▲]

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See detailHabilitation Thesis
Baraud, Yannick UL

Dissertation and these (2002)

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See detailHabilyzer: A User-Driven Open-Ended Sensor Kit for Office Workers
van den Heuvel, Roy; van Bussel, Tjeu; Lallemand, Carine UL

in Proceedings of the Extended Abstracts of the 2022 CHI Conference on Human Factors in Computing Systems (2022, April)

Office work presents health and wellbeing challenges, triggered by working habits or environmental factors. While technological interventions gain popularity in the workplace, they often fall short of ... [more ▼]

Office work presents health and wellbeing challenges, triggered by working habits or environmental factors. While technological interventions gain popularity in the workplace, they often fall short of acknowledging personal needs. Building on approaches from personal informatics, we present our vision on the use of user-driven, situated sensor probes in an office context and how the community might deal with complex yet timely questions around the use of data to empower people in becoming explorers of their own habits and experiences. We demonstrate Habilyzer, an open-ended sensor toolkit for office workers, which enables user-driven explorations in self-tracking their work routines. This research contributes an alternative approach to improving working habits and vitality in the workplace, moving from solution-oriented technologies to inquiry-enabling tools. Through this demonstration, we also aim to trigger discussions on the use of sensors and data in the office context, in the light of privacy, consent and data ownership. [less ▲]

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See detailHabilyzer: Empowering Office Workers to Investigate their Working Habits using an Open-Ended Sensor Kit
van Bussel, Tjeu; van den Heuvel, Roy; Lallemand, Carine UL

in Proceedings of the Extended Abstracts of the 2022 CHI Conference on Human Factors in Computing Systems (2022, April)

Office work presents health and wellbeing challenges, triggered by unhealthy working habits or environmental factors. While technologies for vitality in the office context gain popularity, they are often ... [more ▼]

Office work presents health and wellbeing challenges, triggered by unhealthy working habits or environmental factors. While technologies for vitality in the office context gain popularity, they are often solution-focused and fall short in acknowledging personal needs. Building on approaches from personal informatics, we see value in opening up the design space of tracking and sensing technologies for office workers. We designed and deployed an open-ended sensor kit and conducted two complementary studies to investigate the value of empowering office workers to investigate their own working habits. Findings show that Habilyzer triggers curiosity about working habits, and wireless sensors contribute to inquire into those habits, possibly supported by additional tools. We contribute new insights into how an open-ended sensor kit can be designed to support self-tracking practices and underlying reflections in the underexplored context of office work. It is an alternative approach to workplace vitality, moving from solution-oriented technologies to inquiry-enabling tools. [less ▲]

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See detailL'habitat collectif autogéré : choix ou contrainte ?
Hiez, David UL

Scientific Conference (2013)

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See detailHabiter par projets. Transformations urbaines et lieux de ville
Bricocoli, Massimo UL; Savoldi, Paola

in Berque, Augustin; De Biase, Alessia; Bonnin, Philippe (Eds.) Donner lieu au monde: la poétique de l'habiter (2012)

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See detailHabitudes de lecture et compétences de lecture bilingue
Reichert, Monique UL; Krämer, Charlotte UL; Wollschläger, Rachel UL et al

Report (2018)

La problématique soulevée dans cet article concerne les liens entre d’une part, la fréquence de lecture chez les adolescents en fonction des types de textes lus, et de la langue dans laquelle ils lisent ... [more ▼]

La problématique soulevée dans cet article concerne les liens entre d’une part, la fréquence de lecture chez les adolescents en fonction des types de textes lus, et de la langue dans laquelle ils lisent et, dautre part, leur niveau de compétence de lecture en allemand et en français. En outre, il s’agit d’étudier ces liens en fonction des contextes socio-économique et migratoire, de la langue maternelle, et du sexe des adolescents. À cet effet, les données recueillies dans le cadre des Épreuves Standardisées (ÉpStan) de novembre 2016 permettent d’analyser les compétences de lecture en allemand et en français ainsi que les habitudes de lecture extrascolaire de 5177 élèves du grade 9, fréquentant l’Enseignement Secondaire (ES), l’Enseignement Secondaire Technique (EST) ou la branche Préparatoire de l’Enseignement Secondaire Technique (EST-PRE). Les analyses montrent clairement que, indépendamment du sexe, du type d’enseignement et des caractéristiques socioculturelles des adolescents, principalement la tendance à lire des textes narratifs est positivement corrélée aux compétences en lecture. [less ▲]

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