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See detailL'utilisation de la photographie dans la 'Wehrmachtsaustellung' - Rendez-vous manqué entre l'histoire et la photographie
Majerus, Benoît UL

in Cahiers d'Histoire du Temps Présent = Bijdragen tot de Eigentijdse Geschiedenis (2001), 8

Detailed reference viewed: 63 (7 UL)
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See detailUtilisation de médicaments anti-diabétiques au Grand Duché de Luxembourg
De Beaufort, Carine UL; Michel, G.; Haas, N. et al

in Bulletin de la Société des Sciences Médicales du Grand-Duché de Luxembourg (1991), 2

Detailed reference viewed: 36 (0 UL)
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See detailUtilisation des modules elliptiques de Drinfeld en cryptologie
Gillard, Roland; Leprévost, Franck UL; Pantchichkine, Alexei et al

in Comptes Rendus. Mathématique (2003), 336(11), 879-882

Detailed reference viewed: 31 (0 UL)
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See detailUtilisation des signes et émergence de sens en mathématiques: le cas du signe "moins"
Vlassis, Joëlle UL

in Les didactiques des disciplines: spécificités et complémentarités avec d'autres sciences de l'éducation (2009)

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See detailL’utilisation du procès à des fins marketing
Menetrey, Séverine UL

in Bouthinon-Dumas, Hugues (Ed.) La communication juridique et judiciaire (2015)

Detailed reference viewed: 31 (1 UL)
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See detailL'utilisation du signe négatif et activités de modélisation
Vlassis, Joëlle UL

in Education & Formation (2013), 298(1),

Les difficultés que les élèves rencontrent avec les nombres négatifs dans les opérations algébriques élémentaires sont actuellement bien connues. Traditionnellement, ces difficultés sont attribuées au ... [more ▼]

Les difficultés que les élèves rencontrent avec les nombres négatifs dans les opérations algébriques élémentaires sont actuellement bien connues. Traditionnellement, ces difficultés sont attribuées au concept même de nombre négatif, considéré comme un « obstacle épistémologique ». Dans cette article, nous proposons une approche explicative basée sur les approches socioculturelles qui définissent une étroite relation entre les « signes » et le sens en mathématiques. Ainsi, nous considérons que l’obstacle des négatifs trouverait davantage son origine dans une utilisation inadéquate du signe « moins » que dans le concept lui-même. Cet article développe une séquence d'apprentissage destinée à promouvoir une utilisation flexible du signe « moins » dans les réductions polynomiales auprès d'élèves de 2e année du secondaire. Cette séquence se fonde sur les approches socioculturelles qui ont conduit à définir des options didactiques basées sur les activités de modélisation des élèves. Dans la séquence, nous proposons l'exploitation de modèles tels que celui de la droite des nombres destinée à donner du sens aux additions d’entiers et celui de cartes utilisées pour assurer une progression dans la symbolisation d'un terme littéral. Dans ce contexte, la question du rôle des modèles traditionnels concrets dans l’enseignement des mathématiques sera abordée. Nos résultats montrent que les élèves peuvent efficacement utiliser les modèles pour donner du sens aux réductions polynomiales élémentaires, dans la mesure où ceux-ci se développent de manière bottom up dans un contexte de co-construction pour répondre aux besoins de communication et d’argumentation de l’activité. [less ▲]

Detailed reference viewed: 70 (9 UL)
See detailL'utilisation politique de l'histoire par le Parlement européen
Spirinelli, Fabio UL

Article for general public (2019)

Detailed reference viewed: 28 (1 UL)
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See detailThe Utility of Complex Problems in University Selection
Stadler, Matthias UL; Greiff, Samuel UL

Scientific Conference (2014, April 30)

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See detailA utility-based dynamic demand estimation model that explicitly accounts for activity scheduling and duration
Cantelmo, Guido UL; Viti, Francesco UL; Nigro, Marialisa et al

in Transportation Research. Part A, Policy and Practice (2018)

This paper proposes a Dynamic Demand Estimation (DODE) framework that explicitly accounts for activity scheduling and duration. By assuming a Utility-Based departure time choice model, the time-dependent ... [more ▼]

This paper proposes a Dynamic Demand Estimation (DODE) framework that explicitly accounts for activity scheduling and duration. By assuming a Utility-Based departure time choice model, the time-dependent OD flow becomes a function, whose parameters are those of the utility function(s) within the departure time choice model. In this way, the DODE is solved using a parametric approach, which, on one hand, has less variables to calibrate with respect to the classical bi-level formulation while, on the other hand, it accounts for different trip purposes. Properties of the model are analytically and numerically discussed, showing that the model is more suited for estimating the systematic component of the demand with respect to the standard GLS formulation. Differently from similar approaches in literature, which rely on agent-based microsimulators and require expensive survey data, the proposed framework is applicable with all those DTA models, which are based on OD matrix, and do not necessarily need any data at user level. This has been proven by applying the proposed approach with a standard macroscopic realistic Dynamic Traffic Assignment (DTA) [less ▲]

Detailed reference viewed: 69 (1 UL)
See detailUtility-Based Kalman Filtering for real-time estimation of daily demand flows
Cantelmo, Guido UL; Qurashi, Moeid; Prakash, Arun et al

Scientific Conference (2018)

Time-dependent Origin-Destination (OD) demand flows are fundamental inputs for Dynamic Traffic Assignment (DTA) systems and real-time traffic management. This work introduces a novel state-space framework ... [more ▼]

Time-dependent Origin-Destination (OD) demand flows are fundamental inputs for Dynamic Traffic Assignment (DTA) systems and real-time traffic management. This work introduces a novel state-space framework to estimate these demand flows in an online context. Specifically, we propose to explicitly include trip-chaining behavior within the state-space formulation, which is solved using the well-established Kalman Filtering technique. While existing works already consider structural information and recursive behavior within the online demand estimation problem, this information has been always considered at the OD level. In this study, we introduce this structural information by explicitly representing trip-chaining within the estimation framework. The advantage is twofold. First, all trips belonging to the same tour can be jointly calibrated. Second, given the estimation during a certain time interval, a prediction of the structural deviation over the whole day can be obtained without the need to run additional simulations. The effectiveness of the proposed methodology is demonstrated first on a toy network and then on a large real-world network. Results show that the model improves the prediction performance with respect to a conventional Kalman Filtering approach. We also show that, on the basis of the estimation of the morning commute, the model can be used to predict the evening commute without need of running additional simulations. [less ▲]

Detailed reference viewed: 82 (1 UL)
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See detailUtilization of drug sales data for the epidemiology of chronic diseases: the example of diabetes
Papoz, L.; De Beaufort, Carine UL

in Epidemiology (Cambridge, Mass.) (1993), 4

An indirect method for estimating the prevalence rates of chronic diseases that are treated by specific drugs was proposed in 1988 to European countries in the framework of a European Community concerted ... [more ▼]

An indirect method for estimating the prevalence rates of chronic diseases that are treated by specific drugs was proposed in 1988 to European countries in the framework of a European Community concerted action on diabetes epidemiology. Data on consumption of antidiabetic drugs were collected at the national level in nine countries and at a regional level in two. Using official drug sales data and recent demographic data, we estimated the diabetes prevalence rates in each country or region. The estimated diabetes prevalence in Europe varied from 1.6% in Northern Ireland to 4.7% in Malta. In four countries that already had diabetes prevalence data, the estimation through drug consumption provided figures 3-20% lower than those from field surveys. This study showed a large variety of prescribing habits for diabetic patients in Europe (for example, the proportion of insulin-treated patients varies from 13% to 36%) and underscores the need for a consensus on antidiabetic treatments based on valid clinical research. The proposed approach does not replace field surveys but provides an inexpensive and practical marker of disease frequency and therapeutic attitudes over space and time. [less ▲]

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See detailUtilization of Scenarios in European Electricity Policy: The Ten-Year Network Development Plan
Scheibe, Alexander UL

in OIES Paper (2018)

The transformation of the European Union’s energy sector poses a number of challenges to the European electricity system. Above all, both the anticipated increase of intermittent electricity from ... [more ▼]

The transformation of the European Union’s energy sector poses a number of challenges to the European electricity system. Above all, both the anticipated increase of intermittent electricity from renewable sources and the completion of the internal energy market while guaranteeing a secure supply require an extensive development of electricity infrastructure at the European level. Nevertheless, Europe’s future electricity system entails numerous uncertainties. For example, the definite amount and the location of both electricity generation and consumption are unpredictable. In order to address these ambiguities, the European Network of Transmission System Operators for Electricity (ENTSO-E) develops the two-yearly Ten-Year Network Development Plan (TYNDP). By exploring different plausible future paths using scenarios, the TYNDP aims to identify key infrastructure projects – namely transmission lines and cross-border interconnectors – for the future electricity system. In this capacity, the TYNDP is the central planning tool for European grid infrastructure. This paper explores whether the TYNDP effectively provides a solid planning foundation for future grid investments. For this end, the TYNDPs 2012-2018 are investigated in the light of European energy policies, and their utilization by stakeholders is scrutinized. The paper argues that an existing policy congruence and the strong link to the Projects of Common Interest (PCI) confine the TYNDP solely to the hardware of the electricity system. This in turn profoundly limits the TYNDP’s effectiveness as a strategic planning tool. Hence, a closer connection to the software components of the anticipated European electricity system – namely the future market design and (European) regulations – would further allow for a holistic planning and evaluation of future electricity infrastructure projects. [less ▲]

Detailed reference viewed: 63 (13 UL)
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See detailUtilizing Dynamic Hazard Knowledge for Risk Sensitive Action Planning of Autonomous Robots
Ertle, P.; Voos, Holger UL; Soeffker, D.

in IEEE Int. Symposium on Robotics and Sensor Environments ROSE, Magdeburg, Germany, 2012 (2012)

Autonomous robots are required to perform tasks in complex and dynamic environments. For this class of systems, traditional safety assuring methods are not satisfying due to the unknown effects of the ... [more ▼]

Autonomous robots are required to perform tasks in complex and dynamic environments. For this class of systems, traditional safety assuring methods are not satisfying due to the unknown effects of the interacting system with an open environment. Briefly speaking: What is not known during the development phase can not be adequately considered. In order to tackle this problem, it is proposed to extend the safety measures with the so-called dynamic risk assessment. Therefore, the anticipatory capability of a Cognitive Technical System, the so-called mental action space, is utilized. The mental action space, a learned internal representation for possible courses of action, is dynamically assessed. The proposed dynamic risk assessment module provides this functionality. The core are quantitative risk models, so-called ‘safety principles’, which can be specified during the system’s design stage without losing the possibility to be adjusted or extended during the system’s operating time. Finally, an exemplary application of the approach shows a robot, enabled to safely plan and perform its tasks concerning risks arising due to interaction of robot and environment. [less ▲]

Detailed reference viewed: 81 (4 UL)
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See detailUtilizing the Krafft phenomenon to generate ideal micelle-free surfactant-stabilized nanoparticle suspensions
Dölle, Sarah; Lechner, Bob-Dan; Park, Ji Hyun et al

in Angewandte Chemie International Edition (2012), 51(13), 3254-3257

Detailed reference viewed: 78 (0 UL)
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See detailUWB Joint TOA and DOA estimation
Lagunas, Eva UL; Najar, Montse; Navarro, Monica

in IEEE International Conference on UWB, Vancouver, Canada, 9-11 September, 2009. (2009)

Detailed reference viewed: 78 (4 UL)
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See detailA UX Approach to Privacy and Security: the Impact of User, Contextual and System-Related Factors
Distler, Verena UL; Lallemand, Carine UL; Koenig, Vincent UL

in CHI Workshop Exploring Individual Diffferences in Privacy (2018, April)

This position paper lays out current and future studies which we conduct on the UX aspects of security and privacy, our goal being to understand which factors influence privacy-related decision-making. We ... [more ▼]

This position paper lays out current and future studies which we conduct on the UX aspects of security and privacy, our goal being to understand which factors influence privacy-related decision-making. We advocate using UX design methods in order to study interindividual differences, system-related and contextual factors involved in privacy and security attitudes and behaviors. These results will contribute to user-tailored and personalized privacy initiatives and guide the design of future technologies. [less ▲]

Detailed reference viewed: 201 (12 UL)
See detailUX-Testing im Guerilla-Style
Rohles, Björn UL

Article for general public (2019)

Testing the usability and user experience of digital products and services (e.g. websites or apps) usually involves a lot of effort. But this does not necessarily have to be the case: small tests are ... [more ▼]

Testing the usability and user experience of digital products and services (e.g. websites or apps) usually involves a lot of effort. But this does not necessarily have to be the case: small tests are better than none. Especially if they are lean, fast and agile. A look at the powerful tactics of guerrilla UX testing. [less ▲]

Detailed reference viewed: 13 (2 UL)
See detailV wie Verschiebung
Heimböckel, Dieter UL

Article for general public (2012)

Detailed reference viewed: 54 (0 UL)