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See detailOn the weightwise nonlinearity of weightwise perfectly balanced functions
Gini, Agnese UL; Meaux, Pierrick UL

in Discrete Applied Mathematics (2022), 322

In this article we perform a general study on the criterion of weightwise nonlinearity for the functions which are weightwise perfectly balanced (WPB). First, we investigate the minimal value this ... [more ▼]

In this article we perform a general study on the criterion of weightwise nonlinearity for the functions which are weightwise perfectly balanced (WPB). First, we investigate the minimal value this criterion can take over WPB functions, deriving theoretic bounds, and exhibiting the first values. We emphasize the link between this minimum and weightwise affine functions, and we prove that for n≥8 no n-variable WPB function can have this property. Then, we focus on the distribution and the maximum of this criterion over the set of WPB functions. We provide theoretic bounds on the latter and algorithms to either compute or estimate the former, together with the results of our experimental studies for n up to 8. Finally, we present two new constructions of WPB functions obtained by modifying the support of linear functions for each set of fixed Hamming weight. This provides a large corpus of WPB function with proven weightwise nonlinearity, and we compare the weightwise nonlinearity of these constructions to the average value, and to the parameters of former constructions in 8 and 16 variables. [less ▲]

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See detailSchool tracking in Luxembourg: the longitudinal impact of student characteristics and school composition
Pit-Ten Cate, Ineke UL; Ottenbacher, Martha UL; Alieva, Aigul et al

Scientific Conference (2022, December 05)

Research question: The current study aimed to investigate the influence of student and school level factors on school tracking in secondary education. We were especially interested in the association ... [more ▼]

Research question: The current study aimed to investigate the influence of student and school level factors on school tracking in secondary education. We were especially interested in the association between student characteristics and school composition in Grade 3 and school track in Grade 9. Data source: Data were collected as part of the Luxembourg school monitoring programme “Épreuves Standardisées” (ÉpStan; Fischbach et al., 2014). The study cohort include all students enrolled in the Luxembourg public education system in Grade 3 in November 2013 combined with data from the same students in Grade 9 in November 2017-2019 for students following advanced or regular educational pathways, completed with data from November 2020 and 2021 for students that repeated once or twice (N≈3600). Theoretical approach: The study draws upon theoretical frameworks and empirical findings (e.g., Boudon, 1974; Bourdieu, 1984), that have demonstrated students´ socio-demographic characteristics are associated with (dis)advantages for specific groups of students in education systems as well as more recent work focusing on school composition (e.g., Baumert et al., 2006), especially as tracked school systems are known to be prone to social segregation (e.g., Hadjar & Gross, 2016). To date, most research on school segregation in tracked education systems such as Luxembourg has focused on individual student´s characteristics. However, with increasing heterogeneity of student cohorts and known differences in educational opportunities related to the social and ethnic composition of the school’s student body (e.g., Thrupp et al., 2002), the current research extents the existing literature by considering both individual (including prior academic achievement and socio-demographic characteristics) and school level factors (mean academic level and percentage of students from lower socio-economic and migration background) in predicting school track placement. Main findings: Results of a multilevel random effect logistic regression analysis in which we estimated marginal effects on the probability to be placed in the highest, middle or lowest track in Luxembourg show that even after controlling for student´s academic achievement, track placement is affected by the gender and socio-economic background of the student, whereby boys and students from low SES families have less chance to be placed in the highest track. The association with socio-economic background is not only visible on the student level but also on school level, whereby students attending primary schools with a higher percentage of low SES families have less chance to be orientated to the higher track compared to the middle track, regardless of the student´ individual academic performance. [less ▲]

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See detailAdaptive Beam Pattern Selection and Resource Allocation for NOMA-Based LEO Satellite Systems
Wang, Anyue UL; Lei, Lei; Hu, Xin et al

Scientific Conference (2022, December 04)

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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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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 detailDoes a short-term deadline extension affect participation rates of an online survey? Experimental evidence from an online panel
Decieux, Jean Philippe Pierre UL; Heinz, Andreas UL

in International Journal of Social Research Methodology (2022)

In times of decreasing response rates and survey participation, many ‘best-practices’ have been developed for increasing survey recruitment. However, most of these have never been adequately and ... [more ▼]

In times of decreasing response rates and survey participation, many ‘best-practices’ have been developed for increasing survey recruitment. However, most of these have never been adequately and experimentally scrutinized for their efficacy. Therefore, in this research note, we draw on probability-based data of an online panel and experimentally examine whether it is possible to increase survey participation behavior by communicating a deadline extension. Overall, our results show that it is possible to influence participation behavior by deadline communication. While overall response speed was significantly faster when a deadline extension was communicated, the overall response rate was slightly lower, compared to scenarios in which no deadline extension was communicated. Thus, we refrain from recommending a deadline extension unless there are specific reasons to do so. [less ▲]

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See detailValues-based territorial food networks Qualifying sustainable and ethical transitions of alternative food networks.
Reckinger, Rachel UL

in Regions & Cohesion (2022), 12(3, Winter 2022), 78-109

This comparative literature review of local food systems, short food supply chains, and civic food networks, subsumed under alternative food networks (AFN), suggests converging them into the novel ... [more ▼]

This comparative literature review of local food systems, short food supply chains, and civic food networks, subsumed under alternative food networks (AFN), suggests converging them into the novel umbrella-term values-based territorial food networks (VTFN). Based on the analysis of specificities and shortcomings in the four concepts, VTFN aims to enhance conceptual clarity, while the current coexistence conceals structural and systemic commonalities—relevant for understanding pathways to ethical and sustainable food system transformations. Taking stock of issues in the four concepts, VTFN strives to be overarching and pragmatic. It qualifi es AFN’s “alternativeness” through social, economic, environmental and governance “sustainability values” and through the co-construction of “territoriality” in varying constellations. Thus, it fosters integrated scientific dialogue about conceptual determinations of emerging networks of food system transitions worldwide. [less ▲]

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See detailCorporate Managers, Price Noise and the Investment Factor
Lehnert, Thorsten UL

in Financial Innovation (2022), 8(61),

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See detailPower Allocation for Space-Terrestrial Cooperation Systems with Statistical CSI
Chien, Trinh-Van; Lagunas, Eva UL; Hoang, Tiep M. et al

in IEEE Global Communications Conference (IEEE Globecom), Rio de Janeiro, Brazil, Dec. 2022 (2022, December)

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See detailCoexistence of eMBB and URLLC in Open Radio Access Networks: A Distributed Learning Framework
Al-Senwi, Madyan Abdullah Othman UL; Lagunas, Eva UL; Chatzinotas, Symeon UL

in IEEE Global Communications Conference (IEEE Globecom), Rio de Janeiro, Brazil, Dec. 2022 (2022, December)

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See detailThe multi-scale analysis of dynamic transmission volatility of carbon prices
Nsouadi, Ange; Terraza, Virginie UL

in Economics Bulletin (2022)

The implementation of the EU ETS in 2005 led to the establishment of a price that enables manufacturers to realize the impact of their activities on the environment clean. There are no items this day ... [more ▼]

The implementation of the EU ETS in 2005 led to the establishment of a price that enables manufacturers to realize the impact of their activities on the environment clean. There are no items this day, since the creation of the European carbon market, which has focused on analyzing volatility transmission between different investment horizons. The purpose of this paper is to fill this gap in the literature. we analyze the volatility of the price of carbon quota (EUA), by studying linear and nonlinear causal relationships of wavelet components between the different volatilities we captured at different time scales. we initially decomposed the EUA price volatility at different time-frequency intervals using a wavelet approach. Our study will be to examine whether the volatility is transmitted from the high-frequency structure of the carbon price in the low frequency. Our results show an intra-structural dependence on carbon price volatility. We detect instability in the volatility of carbon and observe the existence of a bidirectional relationship from high-frequency traders to low-frequency traders. Our study showed that high-frequency shocks yield carbon price can have a significant impact beyond their Frontiers and touch the low-frequency structure associated with long-term traders Keywords: Carbon market, EU ETS, Wavelet, time-scale, Granger Causality. [less ▲]

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See detailTranskultureller Theaterschauplatz: Grenzen und die Odyssee Fliehender – Interdisziplinäre Überlegungen
Heinicke, Julius; Nonoa, Koku Gnatuloma UL

Book published by Melusa Press (2022)

Der vorliegende Sammelband versammelt kritische Forschungsansätze sowohl aus verschiedenen akademischen Disziplinen – der Theater-, Medien , Film-, Literaturwissenschaften sowie der Soziologie, der ... [more ▼]

Der vorliegende Sammelband versammelt kritische Forschungsansätze sowohl aus verschiedenen akademischen Disziplinen – der Theater-, Medien , Film-, Literaturwissenschaften sowie der Soziologie, der Erziehungswissenschaften – als auch der praxisbezogenen Theaterpädagogik und der Sozialen Arbeit. Anliegen ist es, die interdisziplinäre Forschung und einen integrativen Forschungsansatz für den Sammelband fruchtbar zu machen, um so den gegenseitigen akademischen und praktischen Transfer von Wissen hervorzuheben und die Kluft zwischen Wissen und Praxis in Bezug auf Wissenschaft, Theater und Migration zu überwinden: Dabei geht es um die Analyse des komplexen Themenfeldes, das die gegenwärtigen Migrationsbewegungen ins Zentrum der internationalen und interdisziplinären Diskussionen rückt. [less ▲]

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See detailInternet histories second early career researcher award
Milligan, Ian; Brügger, Niels; Goggin, Gerard et al

in Internet Histories: Digital Technology, Culture and Society (2022)

This special issue is the result of our second call for the Internet Histories Early Career Researcher Award. For the second time, in 2021, the journal Internet Histories has invited any interested early ... [more ▼]

This special issue is the result of our second call for the Internet Histories Early Career Researcher Award. For the second time, in 2021, the journal Internet Histories has invited any interested early career researchers (masters students, doctoral students, and post-doctoral researchers) whose research focuses on the history of the Internet and/or the Web, and histories of digital cultures — or any historical topic within the scope of the Internet Histories journal, to apply for the award and to submit an original article. [less ▲]

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See detailBank Politics: Structural Reform in Comparative Perspective
Howarth, David UL; James, Scott

Book published by Oxford University Press (2022)

The problem of banks being 'too big to fail' was the defining regulatory issue of the global financial crisis. However, attempts to tackle the problem by separating retail banking from higher risk trading ... [more ▼]

The problem of banks being 'too big to fail' was the defining regulatory issue of the global financial crisis. However, attempts to tackle the problem by separating retail banking from higher risk trading activities - known as structural reform - proved to be highly divisive and contributed to significant regulatory divergence. In this book, David Howarth and Scott James explain this variation by examining the politics of bank structural reform across six key jurisdictions: the United States, the European Union, the United Kingdom, France, Germany, and the Netherlands. Integrating political economy and public policy approaches, they develop a novel 'comparative financial power' framework to analyse how financial industry influence is mediated by two factors: first, whether bank lobbying is unified and centralized (cooperative financial power) or divided and fragmented (competitive financial power); and second, policy makers' use of venue shifting to depoliticize contentious policy issues. The book explains that the US and UK governments implemented major reforms because the banking industry was divided and faced significant opposition. However, venue shifting to an independent committee led to durable reform in the UK, while political polarization in the US contributed to contested reform. By contrast, the French and German governments balanced unified bank lobbying and political pressures to act by pursuing limited symbolic reforms; the Dutch government deflected the issue through delegation to multiple commissions (no reform); while political stalemate at the EU level resulted from early venue shifting and concerted pan-European bank lobbying. The book makes a major contribution to scholarship on the political economy of finance and business power. [less ▲]

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See detailSecurity Modeling and Analysis of Moving Target Defense in Software Defined Networks
Rodrigues de Mendonça Neto, Júlio UL; Kim, Minjune; Graczyk, Rafal UL et al

in Security Modeling and Analysis of Moving Target Defense in Software Defined Networks (2022, November 28)

The use of traditional defense mechanisms or intrusion detection systems presents a disadvantage for defenders against attackers since these mechanisms are essentially reactive. Moving target defense (MTD ... [more ▼]

The use of traditional defense mechanisms or intrusion detection systems presents a disadvantage for defenders against attackers since these mechanisms are essentially reactive. Moving target defense (MTD) has emerged as a proactive defense mechanism to reduce this disadvantage by randomly and continuously changing the attack surface of a system to confuse attackers. Although significant progress has been made recently in analyzing the security effectiveness of MTD mechanisms, critical gaps still exist, especially in maximizing security levels and estimating network reconfiguration speed for given attack power. In this paper, we propose a set of Petri Net models and use them to perform a comprehensive evaluation regarding key security metrics of Software-Defined Network (SDNs) based systems adopting a time-based MTD mechanism. We evaluate two use-case scenarios considering two different types of attacks to demonstrate the feasibility and applicability of our models. Our analyses showed that a time-based MTD mechanism could reduce the attackers’ speed by at least 78% compared to a system without MTD. Also, in the best-case scenario, it can reduce the attack success probability by about ten times. [less ▲]

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