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See detailOn bisymmetric and quasitrivial operations
Devillet, Jimmy UL

Scientific Conference (2018, June 21)

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See detailKulturelle Diversität als ästhetische Innovationsbedingung
Wiegmann, Eva UL

Presentation (2018, June 21)

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See detailExploring Multilingual Pedagogies: Forced Migrants’ Learning Experiences in Luxembourg
Kalocsanyiova, Erika UL

Scientific Conference (2018, June 20)

While most societies are structured around diverse flows of people and complex linguistic repertoires, (language) education schemes are still dominated by monolingual instructional practices. This paper ... [more ▼]

While most societies are structured around diverse flows of people and complex linguistic repertoires, (language) education schemes are still dominated by monolingual instructional practices. This paper aims to contribute to current discussions on the affordances of multilingual pedagogies in contexts of forced migration. It draws on a range of linguistic ethnographic data (Copland & Creese, 2015) that was collected over the period of 2016-2017 in diverse settings of language learning and socialization. Our research sites in Luxembourg included language courses in French, English and German, mathematics courses, application and web development training, and diverse leisure activities. Having followed the learning trajectory of five asylum applicants, we explored how they built on their old and newly-acquired language resources. Our findings confirm that in order to make their voices heard, the learners often drew upon elements from multiple languages, including those local languages they had no extensive competence in. This multilingual orientation enabled them to see the local languages as new functional resources in their growing repertoires (Kalocsányiová, 2017). This is of special relevance in contexts of forced migration, where learners need to become users of the languages they are learning from the first day onward. [less ▲]

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See detailHighway Network Block with Gates Constraints for Training Very Deep Networks
Oyedotun, Oyebade UL; Shabayek, Abd El Rahman UL; Aouada, Djamila UL et al

in 2018 IEEE International Conference on Computer Vision and Pattern Recognition Workshop, June 18-22, 2018 (2018, June 19)

In this paper, we propose to reformulate the learning of the highway network block to realize both early optimization and improved generalization of very deep networks while preserving the network depth ... [more ▼]

In this paper, we propose to reformulate the learning of the highway network block to realize both early optimization and improved generalization of very deep networks while preserving the network depth. Gate constraints are duly employed to improve optimization, latent representations and parameterization usage in order to efficiently learn hierarchical feature transformations which are crucial for the success of any deep network. One of the earliest very deep models with over 30 layers that was successfully trained relied on highway network blocks. Although, highway blocks suffice for alleviating optimization problem via improved information flow, we show for the first time that further in training such highway blocks may result into learning mostly untransformed features and therefore a reduction in the effective depth of the model; this could negatively impact model generalization performance. Using the proposed approach, 15-layer and 20-layer models are successfully trained with one gate and a 32-layer model using three gates. This leads to a drastic reduction of model parameters as compared to the original highway network. Extensive experiments on CIFAR-10, CIFAR-100, Fashion-MNIST and USPS datasets are performed to validate the effectiveness of the proposed approach. Particularly, we outperform the original highway network and many state-ofthe- art results. To the best our knowledge, on the Fashion-MNIST and USPS datasets, the achieved results are the best reported in literature. [less ▲]

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See detailPose Encoding for Robust Skeleton-Based Action Recognition
Demisse, Girum UL; Papadopoulos, Konstantinos UL; Aouada, Djamila UL et al

in CVPRW: Visual Understanding of Humans in Crowd Scene, Salt Lake City, Utah, June 18-22, 2018 (2018, June 18)

Some of the main challenges in skeleton-based action recognition systems are redundant and noisy pose transformations. Earlier works in skeleton-based action recognition explored different approaches for ... [more ▼]

Some of the main challenges in skeleton-based action recognition systems are redundant and noisy pose transformations. Earlier works in skeleton-based action recognition explored different approaches for filtering linear noise transformations, but neglect to address potential nonlinear transformations. In this paper, we present an unsupervised learning approach for estimating nonlinear noise transformations in pose estimates. Our approach starts by decoupling linear and nonlinear noise transformations. While the linear transformations are modelled explicitly the nonlinear transformations are learned from data. Subsequently, we use an autoencoder with L2-norm reconstruction error and show that it indeed does capture nonlinear noise transformations, and recover a denoised pose estimate which in turn improves performance significantly. We validate our approach on a publicly available dataset, NW-UCLA. [less ▲]

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See detailCharacterizations of biselective operations
Devillet, Jimmy UL; Kiss, Gergely UL

E-print/Working paper (2018)

Let X be a nonempty set and let i,j in {1,2,3,4}. We say that a binary operation F:X^2 -> X is (i,j)-selective if F(F(x_1,x_2),F(x_3,x_4)) = F(x_i,x_j), for all x_1,x_2,x_3,x_4 in X. In this paper we ... [more ▼]

Let X be a nonempty set and let i,j in {1,2,3,4}. We say that a binary operation F:X^2 -> X is (i,j)-selective if F(F(x_1,x_2),F(x_3,x_4)) = F(x_i,x_j), for all x_1,x_2,x_3,x_4 in X. In this paper we provide characterizations of the class of (i,j)-selective operations. We also investigate some subclasses by adding algebraic properties such as associativity or bisymmetry. [less ▲]

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See detailAnti-de Sitter geometry: convex domains, foliations and volume
Tamburelli, Andrea UL

Doctoral thesis (2018)

We study various aspects of the geometry of globally hyperbolic anti-de Sitter 3-manifolds. For manifolds with convex space-like boundaries, homeomorphic to the product of a closed, connected and oriented ... [more ▼]

We study various aspects of the geometry of globally hyperbolic anti-de Sitter 3-manifolds. For manifolds with convex space-like boundaries, homeomorphic to the product of a closed, connected and oriented surface of genus at least two with an interval, we prove that every pair of metrics with curvature less than -1 on the surface can be realised on the two boundary components. For globally hyperbolic maximal compact (GHMC) anti-de Sitter manifolds, we study various geometric quantities, such as the volume, the Hausdorff dimension of the limit set, the width of the convex core and the Holder exponent of the manifold, in terms of the parameters that describe the deformation space of GHMC anti-de Sitter structures. Moreover, we prove existence and uniqueness of a foliation by constant mean curvature surfaces of the domain of dependence of any quasi-circle in the boundary at infinity of anti-de Sitter space. [less ▲]

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See detailEBC network
Lehnert, Thorsten UL

Scientific Conference (2018, June 12)

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See detailExploring a Multiphysics Resolution Approach for Additive Manufacturing
Estupinan Donoso, Alvaro Antonio UL; Peters, Bernhard UL

in JOM (2018)

Metal additive manufacturing (AM) is a fast-evolving technology aiming to efficiently produce complex parts while saving resources. Worldwide, active research is being performed to solve the existing ... [more ▼]

Metal additive manufacturing (AM) is a fast-evolving technology aiming to efficiently produce complex parts while saving resources. Worldwide, active research is being performed to solve the existing challenges of this growing technique. Constant computational advances have enabled multiscale and multiphysics numerical tools that complement the traditional physical experimentation. In this contribution, an advanced discrete--continuous concept is proposed to address the physical phenomena involved during laser powder bed fusion. The concept treats powder as discrete by the extended discrete element method, which predicts the thermodynamic state and phase change for each particle. The fluid surrounding is solved with multiphase computational fluid dynamics techniques to determine momentum, heat, gas and liquid transfer. Thus, results track the positions and thermochemical history of individual particles in conjunction with the prevailing fluid phases' temperature and composition. It is believed that this methodology can be employed to complement experimental research by analysis of the comprehensive results, which can be extracted from it to enable AM processes optimization for parts qualification. [less ▲]

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See detailDesigning personalized, interactive materials for presentation skills
Deroey, Katrien UL

Scientific Conference (2018, June 09)

In this talk I demonstrate how we can design and adapt materials for presentation skills to build on students’ individual needs and disciplinary backgrounds in an interactive way. The context for this is ... [more ▼]

In this talk I demonstrate how we can design and adapt materials for presentation skills to build on students’ individual needs and disciplinary backgrounds in an interactive way. The context for this is a conference skills course I’ve designed and successfully taught for several years. The PhD students on this course vary greatly in their presentation skills, experience and disciplinary background. After an overview of the course content and format, I illustrate how students’ own presentations and research can be integrated so as to enhance personal relevance and interactivity. Aspects of this personalized, interactive course design include filming student presentations, structured peer feedback and reflection, a pre-course questionnaire, and tasks requiring them to work with their conference calls, research, texts, visuals and experiences. I conclude with a summary of course feedback, highlighting what students reported as being particularly useful and what they would add or change. [less ▲]

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See detailUn spectre hante le monde...
Scuto, Denis UL

Article for general public (2018)

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See detailWo mache ich einen Absatz?
Huemer, Birgit UL

Presentation (2018, June 08)

Schreiber gliedern ihre Texte visuell in kleinere Portionen oder Teiltexte, die eine Unterbrechung des Textflusses darstellen und die Information strukturieren (Heinemann & Viehweger 1991). Diese ... [more ▼]

Schreiber gliedern ihre Texte visuell in kleinere Portionen oder Teiltexte, die eine Unterbrechung des Textflusses darstellen und die Information strukturieren (Heinemann & Viehweger 1991). Diese Gliederung erfolgt durch einfache grafisch-formale Mittel, die genre-spezifisch sind und die sich an sprachlich realisierten inhaltlich-thematischen Kriterien sowie an Kriterien der Textkohärenz orientieren (Longacre 1979, van Dijk 1981). Stein (2003) zeigt in seiner Studie, dass der Zusammenhang zwischen dem inhaltlich-thematischen Wechsel und der grafisch-formalen Absatzmarkierung im Text Studierenden der Germanistik als Konzept zwar bekannt ist, jedoch in der Anwendung Schwierigkeiten bereitet. In diesem Vortrag wird am Beispiel deutschsprachiger Masterarbeiten gezeigt, welche Schwierigkeiten den Studierenden die Platzierung und Strukturierung von Absätzen bereitet und welchen Einfluss dies auf Textkohärenz und Leserorientierung hat. Die Ergebnisse basieren auf einer kontrastiven linguistischen Analyse deutsch-, englisch- und französischsprachiger Theoriekapitel in 12 verschiedenen Masterarbeiten aus demselben Fach, in denen die grafisch-formale Absatzmarkierung, die linguistische Struktur von Absätzen und der Einsatz kohäsiver Mittel untersucht wurden. [less ▲]

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See detailAlternative Actors in the Foodscape: Enabling Policies and Politics of Contested Claims for Social and Environmental Justice
Reckinger, Rachel UL

Scientific Conference (2018, June 07)

Recently, a number of resourceful community-driven initiatives for local food production and retail have arisen in Luxembourg, where low organic agricultural rates are paired with high consumer demands ... [more ▼]

Recently, a number of resourceful community-driven initiatives for local food production and retail have arisen in Luxembourg, where low organic agricultural rates are paired with high consumer demands for organic produce, leading to a largely imported organic market. As an encompassing reaction, a niche of social innovators are combining agro-ecological land use and food production with locavorousness and circular economy. Based on qualitative interviews and participant observation, we expand on four case studies of fruit and vegetable production as well as unpackaged and/or socially responsible food retail in today’s Luxembourg. One has been established since the 1980s with over 200 employees, partly in social insertion measures, producing and importing organic fruit and vegetables. Since 2014, three significantly smaller initiatives with higher citizen involvement have emerged, with a cooperative governance structure, a claimed community-supported agricultural outlook, a dynamic presence on social media and regular hands-on workshops and activities. These recent initiatives are more radical in their agro-ecological and/or permaculture practices. In a renewed enacting of circular economy precepts, they focus on local production without relying on imports, as a politicized step further than (possibly industrialized) organic production. Grounded in heterodox experiences of alternative actors in food production and retail niches, we analyse ethical entrepreneurship and the governmentality at its core, political enabling or disabling structures and regulations, as well as commodification and upscaling issues. Therefore, this paper touches on governance interrelations between food policies and politics the politics of contested claims for, and practices of, social and environmental justice. [less ▲]

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See detailFoodscapes in Transition: Policies and Politics Advancing Sustainable Development and Social Justice
Reckinger, Rachel UL; Wahlen, Stefan

Scientific Conference (2018, June 07)

In this session, we would like to discuss the impact, risks and motivations of producers and consumers altering foodscapes. Of particular interest are enabling types of governance that improve ecological ... [more ▼]

In this session, we would like to discuss the impact, risks and motivations of producers and consumers altering foodscapes. Of particular interest are enabling types of governance that improve ecological balance and social justice in policies of governmental regulation and institutions but also in the politics of for example alternative food movements. The main impact that heterodox actors can have seems to be, on one hand, the creation of resourcefulness from innovative niches, not designed to be upscaled but spread by ubiquitous networking and, on the other hand, the exemplification of heterodox economic practices that reduce the current deskilling of producers and consumers and the depletion of natural resources. The risk associated with heterodox initiatives is, besides basic economic viability, territorial competition over land and resources, as well as – more insidiously – the potential of co-option by neoliberal corporate agendas. The motivations of actors involved in such social movements, albeit diverse, tend to stem from a stance of care and ethical (self)government, often using community self-organisation-tools. Such an analysis of food value chain practices focuses on negotiations and struggles among actors in a multifaceted foodscape, where some block and some enhance transitions. Viewing the relationships, interconnectedness and agency of niche innovations and regime hegemonies opens up the perspective of contested knowledge claims. Additionally, the ways in which actors in the regulatory field advance transitions by policy measures and initiatives need to be considered, and in particular the processes of politicization as interdependencies between movement actors and the public sphere. Yet, the daily practices stay embedded in social, cultural and economic constraints and in routines, which are built on tacit knowledge, collective learning and engrained practices; even though repetitive, they can account for both reproduction and innovation. Which types of governance at all levels have shown themselves to be effective in supporting and empowering such bottom-up changes in “knowing and growing food in a contested arena” (Goodman, DuPuis, Goodman, 2014)? [less ▲]

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See detailPromoting inclusive education: The role of teacher’ attitudes and competence
Pit-Ten Cate, Ineke UL; Markova, Mariya UL; Krischler, Mireille UL et al

in Insights on Learning Disabilities: from prevailing theories to validated practices (2018), 15(1), 49-63

Teachers are expected to accommodate an increasingly heterogeneous student population. However, teachers often feel ill prepared and hence may be apprehensive toward the inclusion of students with special ... [more ▼]

Teachers are expected to accommodate an increasingly heterogeneous student population. However, teachers often feel ill prepared and hence may be apprehensive toward the inclusion of students with special education needs (SEN) in regular classrooms. This paper concerns factors associated with the successful implementation of inclusive education. More specifically, it considers teacher characteristics that may facilitate -or hinder- the inclusion of students with SEN. The paper first discusses teacher competencies concerning the accommodation of students with SEN in regular classrooms, not only as a determinant of effective inclusive practice, but also in relation to teacher attitudes toward inclusive education. Second, we investigate to what extent teacher’ attitudes, both toward students with SEN and inclusive education, may affect teaching behaviors and (positive) action toward students with SEN. The paper further discusses (training) methods that could be applied to increase teacher competence and foster positive attitudes in an attempt to strive to a more equitable educational system. [less ▲]

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See detailGovernance and Price Jumps
Lehnert, Thorsten UL

Scientific Conference (2018, June 07)

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See detailLa mobilité transfrontalière des travailleurs est-elle une ressource pour la Grande Région
Pigeron-Piroth, Isabelle UL; Belkacem, Rachid

Conference given outside the academic context (2018)

La Grande Région est l’un des espaces transfrontaliers les plus concernés par les flux de travail frontalier. Face aux nombreux défis (économiques, démographiques, environnementaux, etc.) auxquels elle se ... [more ▼]

La Grande Région est l’un des espaces transfrontaliers les plus concernés par les flux de travail frontalier. Face aux nombreux défis (économiques, démographiques, environnementaux, etc.) auxquels elle se trouve confrontée, peut-on considérer la mobilité transfrontalière comme une ressource pour les territoires frontaliers ? [less ▲]

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See detailOn biselective operations
Devillet, Jimmy UL; Kiss, Gergely UL

Scientific Conference (2018, June 07)

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See detailKulturális örökség, sokféleség, funkcionalitás és zeneoktatás európai kontextusban
Sagrillo, Damien UL

in Magyar Tudomany : A Magyar Tudomanyos Akademia Ertesitoje (2018), 79((2018)6), 808-817

Detailed reference viewed: 4 (1 UL)