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See detailSchumpeterian entrepreneurial digital identity and funding from venture capital firms
Block, Jörn; Fisch, Christian UL; Diegel, Walter

in Journal of Technology Transfer (in press)

Schumpeterian entrepreneurs are considered agents of innovation and technology transfer. However, to fulfill this role, they need entrepreneurial finance. From the perspective of digital identity, we ... [more ▼]

Schumpeterian entrepreneurs are considered agents of innovation and technology transfer. However, to fulfill this role, they need entrepreneurial finance. From the perspective of digital identity, we examine the relationship between a Schumpeterian digital identity and venture capital (VC) funding. Because the VC industry celebrates innovative and visionary entrepreneurship, we posit that a founder’s digital identity as a Schumpeterian-type entrepreneur influences the venture’s chances of receiving VC funding. A quantitative analysis of the language used by 3313 founders in a large sample of Twitter messages, however, provides a mixed picture. While some dimensions of Schumpeterian entrepreneurship have a positive relationship with the acquisition of resources from VC firms (entrepreneurial vision and optimism), other dimensions seem to have no (uncertainty tolerance and rationality) or even a decreasing (achievement motivation) effect. The negative relationships observed can be explained by the particularities of the VC business model, which does not align with Schumpeterian entrepreneurship in all respects. Our study contributes to research on Schumpeterian entrepreneurship, the financing of technology transfer, and the link between entrepreneurial digital identity and entrepreneurial finance. From a practical perspective, the results of our study demonstrate the limits of VC with regard to the financing of technology transfer and highlight the need for public funding through governmental VC or agencies for (disruptive) innovation. [less ▲]

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See detailToward an understanding of the implementation of management innovation in international joint ventures: A multilevel perspective
KORBI, Fadia; Geraudel, Mickaël UL; NAKARA, Walid

in European Management Review (in press)

Implementing management innovation (MI) is a great challenge for international joint ventures (IJVs), specifically for those between multinational enterprises (MNEs) and local firms. Different multilevel ... [more ▼]

Implementing management innovation (MI) is a great challenge for international joint ventures (IJVs), specifically for those between multinational enterprises (MNEs) and local firms. Different multilevel factors have been shown in the international business literature to play a role in MI implementation within IJVs. In this paper, we add to this literature by showing that these factors do not act in isolation and that their interplay must be considered. To this aim, we draw on qualitative data from 35 CEOs and TMT members of five IJVs between European MNEs and Tunisian local firms. Overall, our study reveals that depending on the type of IJV, the multilevel factors playing a role in the implementation of MI are different [less ▲]

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See detailModular organizations and informal structures: Modularity, performance and the alignment of organizational networks
Jonard, Nicolas UL; Cowan, Robin

in Industrial and Corporate Change (in press)

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See detailTriangular Intertwined Frequency Selective Surface
Vasquez-Peralvo, Juan Andres UL

in Vasquez-Peralvo, Juan Andres (Ed.) International symposium on antennas and propagation (in press)

This paper presents a frequency selective surface design and simulation using intertwined triangular structures. It has been discovered that by using the proposed tessellated intertwined lattice, the ... [more ▼]

This paper presents a frequency selective surface design and simulation using intertwined triangular structures. It has been discovered that by using the proposed tessellated intertwined lattice, the reduction of the resonance frequency of a frequency selective surface can be improved by 22.58% compared with other triangular structures. Additionally, this structure is used as a MEFSS to improve the miniaturization of the structure and obtain a compact, angular stable band-pass filter. The simulations presented in this paper have been obtained using CST Microwave Studio. [less ▲]

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See detailWide-Beamwidth Circular Polarized Antenna for Diversity Combining Applications
Vasquez-Peralvo, Juan Andres UL

in Vasquez-Peralvo, Juan Andres (Ed.) Global Communications Conference, Rio de Janeiro, 4 - 9 December 2022 (in press)

This paper presents the design, simulation, and manufacturing of a right-hand circularly polarized antenna working in the frequency band 17.7-20.2 GHz with a beamwidth of 42.4$^\circ$ and 5.4$^\circ$ for ... [more ▼]

This paper presents the design, simulation, and manufacturing of a right-hand circularly polarized antenna working in the frequency band 17.7-20.2 GHz with a beamwidth of 42.4$^\circ$ and 5.4$^\circ$ for the H-plane and E-plane, respectively. The presented antenna is part of a set of three antennas, two high-gain antennas, and, presented in this paper, a low directive antenna used for reception. The application we describe in this paper combines the radio-frequency signals obtained from the O3b satellite constellation, using three antennas to apply path diversity later to reconstruct the original signal. Moreover, using an antenna with a beamwidth in one plane allows receiving two satellite signals at the same time, increasing by 3 dB the overall gain. The wide-band capabilities of the antenna are obtained using aperture coupling. In particular, the circular polarization of the antenna is generated using a truncated corner square patch. Further, a metasurface is placed at the top to enhance the axial ratio. Importantly, the simulation results obtained using CST Microwave Studio show that the antenna has a reflection coefficient below -10 dB and an axial ratio below -3 dB in the intended frequency range. [less ▲]

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See detailThe Ugly Truth of Realistic Perception in Vehicular Simulations
Hawlader, Faisal UL; Frank, Raphaël UL

Poster (2023, January 08)

Automated vehicles use sensors to perceive the environment, and studies have shown the limitations of these sensors. The onboard sensors may not detect objects when other participants occlude the Field of ... [more ▼]

Automated vehicles use sensors to perceive the environment, and studies have shown the limitations of these sensors. The onboard sensors may not detect objects when other participants occlude the Field of View (FoV). Thus, sensor efficiency must be tested to ensure its reliability. Simulation is an excellent test option due to the complexity associated with practical experiments. However, emerging simulation frameworks still have various limitations, especially when it comes to large-scale evaluation. This work investigates realistic perception simulation options for autonomous vehicles. We report the perception accuracy for different traffic scenarios. [less ▲]

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See detailParent’s experience in remote learning with digital and physical mathematical modelling
Haas, Ben; Lavicza, Zsolt; Kreis, Yves UL

in Research and Practice in Technology Learning (2023), 18

In reaction to the COVID-19 pandemic, the government of Luxembourg suspended in-school teaching and learning towards remote teaching. A survey conducted by the Ministry of Education after three weeks of ... [more ▼]

In reaction to the COVID-19 pandemic, the government of Luxembourg suspended in-school teaching and learning towards remote teaching. A survey conducted by the Ministry of Education after three weeks of confinement, showed that more than half of the parents faced difficulties when using remote teaching with their students. To tackle this new challenge, we adapted our research to the use of augmented reality, digital and physical mathematical modelling in remote mathematics education for elementary schools. The elementary school students (aged 5 to 12) created cultural artifacts (i.e., Easter egg cups) during the confinement. In this paper, we will describe mathematical modelling in remote teaching and further concentrate on parents’ perspectives, who played an essential role in assisting their children. Moreover, we will discuss different didactical principles that emerged from the task design during the study through parents’ eyes. Thus, understanding parents’ perspectives became highly important in enabling us to improve task designs and related pedagogical approaches in remote teaching. The data collected in this study included semi-structured interviews with students, parents, and teachers as well as questionnaires and field notes. We followed an exploratory stance with our data analyses, primarily utilizing grounded theory (Corbin & Strauss, 1990, 2014) approaches. Through the insights we gained from our findings, we aim to explain how the parents perceived teaching and learning mathematical modelling in our experiments, how they scaffolded the given tasks, and what support they required and would need in future remote teaching. [less ▲]

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See detailKommunikationsaspekte der Zukunft im Klassenraum
Andersen, Katja Natalie UL; Kihm, Pascal; Neuböck-Hubinger, Brigitte et al

in Gesellschaft für Didaktik des Sachunterrichts (Ed.) Jahresband GDSU 2022: Herausforderungen und Zukunftsperspektiven für den Sachunterricht (2023)

A future-oriented science education refers to everyday experiences, (technical) language and current developments in migration and multilingualism (Kahlert 2022). This requires a participatory bringing ... [more ▼]

A future-oriented science education refers to everyday experiences, (technical) language and current developments in migration and multilingualism (Kahlert 2022). This requires a participatory bringing together of all areas of knowledge and experience in the classroom (Stoltenberg 2004). The arti-cle discusses tasks in science teaching from different perspectives (semantics, multilingualism, etc.), using the topic “swimming and sinking”, which appears to be a suitable frame of reference for several reasons: (1) the topic is based on a wide range of research; (2) it refers to a precise content area with the phenomenon of buoyancy and the considerations on force, density, interaction; (3) it connects to the living environment, and (4) follows the discourse of everyday language vs. educational language. Based on these items, the article tackles the question of what impact language in science textbooks has on (multilingual) students’ acquisition of science content. [less ▲]

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See detailFighting Fires from Crisis to Crisis: The Evolution of Central Banking in Europe
Chang, Michele; Glöckler, Gabriel; Pierret, Laura UL

in Costa, Olivier; Van Hecke, Steven (Eds.) The EU Political System After the 2019 European Elections (2023)

The year 2019 ushered in the end of an era for the European Central Bank when Mario Draghi stepped down as ECB President. The financial crisis left a legacy of central banks as “the only game in town” ... [more ▼]

The year 2019 ushered in the end of an era for the European Central Bank when Mario Draghi stepped down as ECB President. The financial crisis left a legacy of central banks as “the only game in town”. The COVID-19 pandemic reinforced the role of central banks as critical firefighters during crises, in contrast to earlier periods. This contribution examines the evolution of central banking in Europe. First, it evaluates the ideational shifts that allowed for a more expansive interpretation of the role of a central bank. Second, it looks at the ECB’s response to the Covid-19 crisis and assesses the underlying reasons why the use of the bank’s balance sheet is here to stay. Third, it looks at these issues in a comparative perspective, contrasting the issues and policy responses faced by the ECB to those of the Bank of England and the US Federal Reserve. The final section concludes. [less ▲]

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See detailForeword
Powell, Justin J W UL

in Amrhein, Bettina; Naraian, Srikala (Eds.) Reading Inclusion Divergently: Articulations from Around the World (2023)

Globally, the meanings ascribed to inclusive education as a simultaneously pedagogical, social, and political concept are frequently contested, and often complex, yet they must always be contextualized if ... [more ▼]

Globally, the meanings ascribed to inclusive education as a simultaneously pedagogical, social, and political concept are frequently contested, and often complex, yet they must always be contextualized if we are to make sense of them. This is not least because of the complicated relationship of inclusive education to special education, with a long history of community ambivalence, professional dominance, and sociopolitical controversy. The diversity of readings of dynamic conceptualizations of inclusive education and ensuing patterns of practice around the world is the subject of Reading Inclusion Divergently. This volume of contributions builds upon dialogue among scholars from diverse cultures and working in different regions, whose contexts of work and study range considerably in their political and pedagogical understandings of inclusive education, equity, and diversity, as of disability and disadvantage. Emphasizing the process of inclusion as well as the dynamics of interpretation, instead of the unidirectional, linear development focus on policy implementation and gaps, the editors and authors position themselves within the broad spectrum of voices of the global inclusion movement that derives its myriad perspectives from academic and policy to practitioner and advocacy-activist communities. The theoretical, methodological, and empirical diversity of these contributions re!ects contrasting concepts and institutionalizations of special and inclusive education worldwide; an important undertaking as the rhetoric threatens to become increasingly separated from local school realities. While special and inclusive education fundamentally re!ect societal and educational change, these have also affected change in identifying differences in student bodies and the resulting pedagogical responses. During ongoing educational expansion, from contrasting starting points, schooling has changed quantitatively and qualitatively. Those who participate in special and inclusive education, from students and families to teachers and professionals, have also transformed education and society, especially with regard to understandings of dis/ability. This influence has been increasingly visible in the classifications and categories of dis/ability, and in the organizational forms, from original asylums and special schools and classes established so long ago to today’s classrooms that (aspire to) valorize student diversity, which has always been a central challenge of teaching. Yet the (necessary?) existence of such segregated and stigmatizing settings is not everywhere similarly contested, despite the global norm of inclusive education mandated in human rights charters over the past decades. Indeed, such settings are still taken for granted in many contexts – or even bolstered, paradoxically, under the banner of inclusion. Today, widespread recognition of the importance of education for public and private goods such as equity, emancipation, and participation galvanizes contemporary debates. If special education successfully provided learning opportunities to children previously excluded from schooling completely, in many countries the goal has forcefully shifted to inclusive education, yet there has also been backlash against this idea(l). The paradigm shift has certainly not been universally completed, as many chapters in this volume emphasize, no matter which world region we explore, especially due to widespread disadvantages and institutionalized discrimination that remains endemic. Yet the contributions here not only critique policy designs and multilevel reforms, proposed and ongoing, but mainly provide rich understandings of inclusion and of older and nascent forms of difference in schooling – and the dilemmas that follow. In so doing, these texts generate multidimensional perspectives on what inclusive education is becoming. Ideally, inclusive settings support all children, regardless of their characteristics, who attend neighborhood schools and are guided in their individual learning processes to reach their learning goals in diverse classrooms. Yet in much of the world, even the most basic supports and services for disadvantaged students or children with disabilities are (completely) lacking, with impairment, poverty, and educational and social exclusion intertwined. Universally, children and youth need support to achieve their learning goals; albeit to varying degrees and at different times – and the responses to these needs are similarly diverse. Traditionally, special education has provided additional support for the heterogeneous group of learners perceived as having ‘special educational needs’ or labeled and grouped in innumerable categories, mainly defined by clinical, legal, and educational professions. The academic discourse of disability studies in education points out forcefully the danger of these often de"cit-oriented categories and classifications and the legitimated, though questionable, diagnostics that especially clinical professions have often applied, pushing pedagogical considerations to the background. Attempting to make sense of global similarities as well as persistent cross-national and intercultural differences in special and inclusive education requires different approaches, as these contributions emphasize. Comparative and international education research, more than ever, should take on the challenge of explaining variation within and between national contexts in ‘inclusive education’ – and the resulting consequences for students and social groups. Thus, this volume’s contributions provide welcome additions to the literature. Structured in several sections, Reading Inclusion Divergently begins with chapters aiming to understand inclusion as a project devoted to achieving equity and attaining social justice in divergent contexts affected by cultural, politico-legal, and socioeconomic factors. Here, challenges to democracy, rampant ableism, and persistent educational and social inequalities underscore the necessity of education reforms embedded in broader social and political responses, especially to secure human rights. Analyses of such change necessarily embrace history, often long-term colonial and conflict-ridden trajectories that are at once local, national, and global. Inclusive schooling must acknowledge and respond to these legacies, whether in the existing structures and materials or the processes and practices, such as diagnostics and classification, that reproduce power, strati"cation, and inequity. Disability studies, and the global disability movement more generally, offer important lessons as they emphasize the necessity of participatory and emancipatory approaches across the disciplines and fields, including the arts. Other readings offer critical interrogations of inclusive practices in diverse local contexts and in so doing deepen our knowledge of the range of struggles facing inclusion initiatives, from teachers’ discriminatory practices to associations and other corporate groups’ roles and influences in maintaining the status quo to the subversion of inclusive goals via narrow or contradictory interpretations of inclusion. Everywhere, education systems require transformation to be fully inclusive, but how to define and reach that goal is an urgent undertaking; one that remains contentious. Epistemologically and methodologically, the assembled analyses of inclusive education are varied in their approaches to complex and shifting conceptualizations. By contrast, the contributions together clearly mark the importance of transnational and transcultural research, whether viewed from a bird’s-eye or participatory face-to-face perspective. Here, collaboration, including joint interpretation across boundaries – cultural, disciplinary, epistemological, and methodological – is essential to develop shared understandings and valid reconstructions across contexts. Bringing together voices from the Global North and Global South and at various levels of analysis, this book facilitates a rich and important dialogue, showing pathways to fuller understandings of the worldwide discourses and dialectics of inclusive education. [less ▲]

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See detailMarchés captifs et marchés concurrentiels dans la concurrence judiciaire franco-britannique
Cuniberti, Gilles UL

in La Semaine Juridique édition Générale (2022)

Les chambres commerciales internationales de Paris (CCIP) ont été établies dans l'espoir de détourner une partie du contentieux commercial porté devant la juridiction commerciale londonienne. Cet article ... [more ▼]

Les chambres commerciales internationales de Paris (CCIP) ont été établies dans l'espoir de détourner une partie du contentieux commercial porté devant la juridiction commerciale londonienne. Cet article propose une étude empirique de l'activité de cette dernière afin de déterminer lesquels des contentieux dont elle connaît sont captifs, et hors de portée du juge français, et lesquels sont concurrentiels et susceptibles d'être attirés par une offre judiciaire plus attractive. Il analyse ensuite l'activité des CCIP pour déterminer dans quelle mesure la juridiction commerciale parisienne se montre attractive et peut espérer entrer en concurrence avec la justice anglaise. [less ▲]

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See detailIs Bitcoin a better safe-haven asset for individual investors than Gold? – Evidence from sanctioned Russia
Zhang, Lu UL; Wolff, Christian UL

E-print/Working paper (2022)

Extensive research on safe-haven assets has been conducted in the literature. An important finding is that safe-haven assets are frequently used by institutional investors, such as pension funds and ... [more ▼]

Extensive research on safe-haven assets has been conducted in the literature. An important finding is that safe-haven assets are frequently used by institutional investors, such as pension funds and investment banks, to ride out high volatility. However, the issue of whether individual investors can benefit from it during a financial crisis has not been adequately addressed. Using the case of sanctioned Russia, we attempt to study whether Bitcoin as a decentralized asset can play a more useful role than gold to protect individual investors when the majority of safe-haven assets are restricted from transactions. Our main results show that both assets exhibit intraday weak safe-haven properties against the ruble. However, gold saw a waning trend compared with its historical performance, whereas Bitcoin’s capability increased during this period. Further sentiment analysis demonstrates Russian investors’ positive attitudes regarding Bitcoin boosting its price in response to the ruble’s depreciation. The return on gold is more likely to be impacted by international investors who are concerned about global uncertainties. [less ▲]

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See detailHigh-Performance Computing for the simulation of particles with the Discrete Element Method
Besseron, Xavier UL

Scientific Conference (2022, December 09)

In this talk, we will give an overview of the main techniques used for the parallelization of numerical simulations on High-Performance Computing platforms, and provide a particular focus on the Discrete ... [more ▼]

In this talk, we will give an overview of the main techniques used for the parallelization of numerical simulations on High-Performance Computing platforms, and provide a particular focus on the Discrete Element Method (DEM), a numerical method for the simulation of the motion of granular materials. We will cover the main parallelization paradigms and their implementations (shared memory with OpenMP and distributed memory with MPI), present the performance bottlenecks and introduce load-balancing techniques. [less ▲]

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See detailBridging NLP and LLOD: Humanities Approaches to Semantic Change
Armaselu, Florentina UL

Speeches/Talks (2022)

Natural language processing (NLP) for detecting lexical semantic change and linguistic linked open data (LLOD) are two areas of research that have shown promising results in the latest years. However ... [more ▼]

Natural language processing (NLP) for detecting lexical semantic change and linguistic linked open data (LLOD) are two areas of research that have shown promising results in the latest years. However, their potential of being considered together for analysing and representing semantic change from a humanistic perspective needs further study and development. The talk will present an overview of theoretical aspects, NLP techniques and LLOD formalisms intended to this purpose, and will focus on a project developed as a humanities use case within the COST Action “Nexus Linguarum - European network for Web-centred linguistic data science.” The discussion will include preliminary thoughts on the conception of a system that combines dictionary information with corpus evidence, and provides multilingual diachronic ontologies for humanities research. [less ▲]

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See detailDynamic Beam-Layout Design for MEO High Throughput Satellite Systems
Chaker, Haythem UL; Chougrani, Houcine UL; Alves Martins, Wallace UL et al

Scientific Conference (2022, December 04)

We propose a traffic-oriented beam-layout optimization framework for a medium Earth orbit (MEO) high throughput satellite (HTS) system. The designed beam-layout plans have the objective of dynamic traffic ... [more ▼]

We propose a traffic-oriented beam-layout optimization framework for a medium Earth orbit (MEO) high throughput satellite (HTS) system. The designed beam-layout plans have the objective of dynamic traffic load balancing with minimal radio resource management. We model and evaluate the high directivity and the high reconfigurability capabilities of next-generation HTS systems that are equipped with a processing power on board. The resulting payload flexibility is compared numerically against the on-ground counterpart. Adequate key performance indicators, such as the Jain’s fairness index, the load distribution gap and optimization convergence time, are used to benchmark the system against state-of-the-art solutions. Results show that a dynamic HTS in MEO is capable of efficiently attaining high quality load balancing performance under realistic spatiotemporally varying traffic demands. [less ▲]

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See detailCurvature in Biological Systems: Its quantification, Emergence and Implications Across the Scales
Schamberger, Barbara; Roschger, Andreas; Sengupta, Anupam UL et al

in Advanced Materials (2022)

Surface curvature both emerges from, and influences the behavior of, living objects at length scales ranging from cell membranes to single cells to tissues and organs. The relevance of surface curvature ... [more ▼]

Surface curvature both emerges from, and influences the behavior of, living objects at length scales ranging from cell membranes to single cells to tissues and organs. The relevance of surface curvature in biology has been supported by numerous recent experimental and theoretical investigations in recent years. In this review, we first give a brief introduction to the key ideas of surface curvature in the context of biological systems and discuss the challenges that arise when measuring surface curvature. Giving an overview of the emergence of curvature in biological systems, its significance at different length scales becomes apparent. On the other hand, summarizing current findings also shows that both single cells and entire cell sheets, tissues or organisms respond to curvature by modulating their shape and their migration behavior. Finally, we address the interplay between the distribution of morphogens or micro-organisms and the emergence of curvature across length scales with examples demonstrating these key mechanistic principles of morphogenesis. Overall, this review highlights that curved interfaces are not merely a passive by-product of the chemical, biological and mechanical processes but that curvature acts also as a signal that co-determines these processes. [less ▲]

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See detailLes Italien-ne-s dans le Luxembourg des migrations (1ère partie)
Scuto, Denis UL

Article for general public (2022)

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