References of "2019"
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See detailNew Migration of Families from Greece to Europe and Canada – Experiences and Interpretations of Family Members within the Context of Different Migration Societies and Educational Systems
Chatzidaki; Kirsch, Claudine UL; Panagiotopoulou, Argyro et al

Book published by Springer - Reihe Inklusion Bildung Migration (2019)

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See detailChallenges in completing EMU: asymmetric competition vs fiscal harmonisation. A case study of the Benelux countries
Danescu, Elena UL

in Journal of Contemporary European Research [=JCER] (2019)

This paper aims to investigate the concept, context and socio-economic consequences of fiscal competition in the integrated economic space of EMU in completion, to pinpoint the positive and negative ... [more ▼]

This paper aims to investigate the concept, context and socio-economic consequences of fiscal competition in the integrated economic space of EMU in completion, to pinpoint the positive and negative factors at work via a case study of the Benelux countries – both founder members of the EU and pioneers of EMU – and to examine the impact on European and international regulations in the field. In particular, it will endeavour to provide a comprehensive interpretation of fiscal policy in the Benelux countries via a comparative approach and from a historical perspective. It will look at the development of respective domestic fiscal policies, driven by national interests and by membership of a Community that is subject to requirements in terms of harmonisation and taxation, but also by constant contact (and frequent clashes) with the multilateral international environment. [less ▲]

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See detailMonitoring du système scolaire – Le modèle luxembourgeois (invited talk)
Fischbach, Antoine UL

Scientific Conference (2019, October 17)

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See detailOn indefinite sums weighted by periodic sequences
Marichal, Jean-Luc UL

in Results in Mathematics (2019), 74(3), 95

For any integer $q\geq 2$ we provide a formula to express indefinite sums of a sequence $(f(n))_{n\geq 0}$ weighted by $q$-periodic sequences in terms of indefinite sums of sequences $(f(qn+p))_{n\geq 0 ... [more ▼]

For any integer $q\geq 2$ we provide a formula to express indefinite sums of a sequence $(f(n))_{n\geq 0}$ weighted by $q$-periodic sequences in terms of indefinite sums of sequences $(f(qn+p))_{n\geq 0}$, where $p\in\{0,\ldots,q-1\}$. When explicit expressions for the latter sums are available, this formula immediately provides explicit expressions for the former sums. We also illustrate this formula through some examples. [less ▲]

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See detailFear and Euphoria
Lehnert, Thorsten UL

Scientific Conference (2019, August 28)

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See detailValue-added modeling in primary school: What covariates to include?
Levy, Jessica UL; Brunner, Martin; Keller, Ulrich UL et al

Scientific Conference (2019, August)

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See detailBracketing in student writing: its uses (and abuses)
Deroey, Katrien UL

Scientific Conference (2019, July 23)

This paper reports on the use of bracketed text in a large corpus of student writing. The function of bracketing has been neglected in academic writing research and coursebooks. Yet it is closely related ... [more ▼]

This paper reports on the use of bracketed text in a large corpus of student writing. The function of bracketing has been neglected in academic writing research and coursebooks. Yet it is closely related to important text construction issues such as information packaging, coherence, clarity, conciseness, intertextual framing and sourcing. With a view to informing academic writing description and instruction, we examined the relationship between bracketed text and its cotext in a wide variety of disciplines and assignment genres. The relationships are described using an adaptation of Halliday and Matthiessen’s (2014) logico-semantic framework of clausal relationships. To better understand and teach the use of this information packaging feature, we studied the relationship between bracketed text and its cotext in the British Academic Written English (BAWE) corpus of high-graded student assignments. Using Sketch Engine and corpus query language, we extracted a random sample of 2000 instances of bracketing in running text only. This subcorpus is composed of 500 instances from each of the four main disciplinary groupings (Arts and Humanities, Life Sciences, Physical Sciences, Social Sciences) and contains instances from most of the BAWE assignment genres. The concordances were imported into a database table in FileMaker Pro. This database programme facilitates coding by limiting choices depending on previous selections and thus guiding the coder through the analytical steps. For the analysis of the data, it offers flexibility for grouping records and aggregating results on different levels. The logico-semantic framework used in systemic functional linguistics to classify the relationships between clauses (Halliday & Matthiessen, 2014) served as our starting point to classify the relationships between bracketed text and cotext. This framework distinguishes two fundamental logico-semantic relationships: expansion, which ‘relates phenomena as being of the same order of experience’, and projection, which ‘relates phenomena of one order of experience (the processes of saying and thinking) to phenomena of a higher order (semiotic phenomena – what people say and think)’ (p. 443). The latter contains three subtypes: elaboration (‘one clause elaborates on the meaning of another by further specifying or describing it’) (p. 461), enhancement (‘one clause (or subcomplex) enhances the meaning of another by qualifying it) (p. 476) and extension (‘one clause extends the meaning of another by adding something new to it’) (p. 471). This framework was refined and expanded through several stages of interrating and discussion in order to reflect our findings. We first analysed a random sample of 1000 instances from the whole BAWE corpus. With the resulting adapted classificatory framework we next independently analysed a quarter of our subcorpus of 2000 concordances. This led to further refinement of the framework and classificatory criteria. Finally, we each analyzed a different set of concordances from the disciplinary groupings. Disciplinary informants were consulted where needed. Our analysis revealed four major logico-semantic relationships between the bracketed text and cotext: in addition to Halliday & Matthiessen’s (2014) projection (1) and expansion (elaboration (2), enhancement (3, 4), extension (5)), we identified bracketed text functioning as intratextual reference (6) and code (7). The few instances that could not be confidently classified were assigned to a ‘hard to classify’ category. (1) However the anticipated number of children per woman in Europe and the USA is still near or above two (Bongaarts, 1999), showing that many are still having children. (2) Many of these injures are healed fractures and breaks occurring around the torso (upper body). (3) It is dated to the reign of Nectanebo II (360-343 BC). (4) Acetanilide (4.78g, 35.4 mmol) was dissolved in cold, glacial acetic acid (25ml, 437.1 mmol) (5) Parmenides decision to include a cosmology that he has already (apparently) proved to be flawed is an interesting one to say the least. (6) This is called circular polarization (figure 5) and is the natural state of white light. (7) Stronger field ligands such as (PPh 3) and (NCS) increase the splitting. Projection was –perhaps not surprisingly- the most common relationship by far, although markedly less frequent in the Physical Sciences. Expansion was mainly achieved through elaboration, with restatements (2) and abbreviations predominating. Enhancement relationships were mostly temporal locations (3) or measurements (4). Extension was relatively rare (5). Intratextual references (6) took various forms, such as figures, appendices, equations, and line numbers for quoted text. Bracketed code was a marked feature of the Physical Sciences, occurring in formulae and enclosing symbols or abbreviations (7). Overall, students’ use of bracketed text appeared to reflect disciplinary conventions and reflected the genre goals of assignments by demonstrating knowledge, understanding and appropriate source use. Contrary to expectations, instances where the bracketed text seemed superfluous or adversely affected coherence were rare. We conclude by discussing what these findings mean for academic writing instruction. Reference Halliday, M. A. K., & Matthiessen, C. M. I. M. (2014). Halliday's introduction to functional grammar (4 ed.). Abingdon: Routledge. [less ▲]

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See detailAnalysis of Multi-path Onion Routing-based Anonymization Networks
de La Cadena Ramos, Augusto Wladimir UL; Kaiser, Daniel UL; Mitseva, Asya UL et al

in Data and Applications Security and Privacy XXXIII, 2019 (2019, July 15)

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See detailBayesian Identification of Mean-Field Homogenization model parameters and uncertain matrix behavior in non-aligned short fiber composites
Mahamedou, Mohamed; Zulueta Uriondo, Kepa; Chung, Chi Nghia et al

in Composite Structures (2019), 220

We present a stochastic approach combining Bayesian Inference (BI) with homogenization theories in order to identify, on the one hand, the parameters inherent to the model assumptions and, on the other ... [more ▼]

We present a stochastic approach combining Bayesian Inference (BI) with homogenization theories in order to identify, on the one hand, the parameters inherent to the model assumptions and, on the other hand, the composite material constituents behaviors, including their variability. In particular, we characterize the model parameters of a Mean-Field Homogenization (MFH) model and the elastic matrix behavior, including the inherent dispersion in its Young's modulus, of non-aligned Short Fibers Reinforced Polymer (SFRP) composites. The inference is achieved by considering as observations experimental tests conducted at the SFRP composite coupons level. The inferred model and material law parameters can in turn be used in Mean-Field Homogenization (MFH)-based multi-scale simulations and can predict the confidence range of the composite material responses. [less ▲]

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See detailWHY IS THE MARKET SKEWNESS-RETURN RELATIONSHIP NEGATIVE?
Lehnert, Thorsten UL

Scientific Conference (2019, July 09)

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See detailThe use of value-added models for the identification of schools that perform “against the odds”
Levy, Jessica UL; Brunner, Martin; Keller, Ulrich UL et al

Poster (2019, July)

Value-added (VA) modeling aims to quantify the effect of pedagogical actions on students’ achievement, independent of students’ backgrounds. VA modeling is primarily used for accountability and high ... [more ▼]

Value-added (VA) modeling aims to quantify the effect of pedagogical actions on students’ achievement, independent of students’ backgrounds. VA modeling is primarily used for accountability and high-stakes decisions. To date, there seems to be no consensus concerning the calculation of VA models. Our study aims to systematically analyze and compare different school VA models by using longitudinal large-scale data emerging from the Luxembourg School Monitoring Programme. Regarding the model covariates, first findings indicate the importance of language (i.e., language(s) spoken at home and prior language achievement) in VA models with either language or math achievement as a dependent variable, with the highest amount of explained variance in VA models for language. Concerning the congruence of different VA approaches, we found high correlations between school VA scores from the different models, but also high ranges between VA scores for single schools. We conclude that VA models should be used with caution and with awareness of the differences that may arise from methodological choices. Finally, we discuss the idea that VA models could be used for the identification of schools that perform “against the odds”, especially for those schools that have positive VA scores over several years. [less ▲]

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See detailCrowdsensed Data Learning-Driven Prediction of Local Businesses Attractiveness in Smart Cities
Capponi, Andrea UL; Vitello, Piergiorgio UL; Fiandrino, Claudio UL et al

in IEEE Symposium on Computers and Communications (ISCC), Barcelona, Spain, 2019 (2019, July)

Urban planning typically relies on experience-based solutions and traditional methodologies to face urbanization issues and investigate the complex dynamics of cities. Recently, novel data-driven ... [more ▼]

Urban planning typically relies on experience-based solutions and traditional methodologies to face urbanization issues and investigate the complex dynamics of cities. Recently, novel data-driven approaches in urban computing have emerged for researchers and companies. They aim to address historical urbanization issues by exploiting sensing data gathered by mobile devices under the so-called mobile crowdsensing (MCS) paradigm. This work shows how to exploit sensing data to improve traditionally experience-based approaches for urban decisions. In particular, we apply widely known Machine Learning (ML) techniques to achieve highly accurate results in predicting categories of local businesses (LBs) (e.g., bars, restaurants), and their attractiveness in terms of classes of temporal demands (e.g., nightlife, business hours). The performance evaluation is conducted in Luxembourg city and the city of Munich with publicly available crowdsensed datasets. The results highlight that our approach does not only achieve high accuracy, but it also unveils important hidden features of the interaction of citizens and LBs. [less ▲]

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See detailTheir ‘Apple of Discord’ or the Apple of Their Eye: How the British Secured Eastern Mediterranean and Western European Security, 1947-1948
Paravantis, Spero UL

in Kamouzis, Dimitris; Nafpliotis, Alexandros (Eds.) Αnglo-Hellenic relations in the 20th Century (2019)

This chapter examines the role the British policy in Greece played in the shift in American foreign policy that was manifested in 1947-48, that led directly to these alliances, namely the Western European ... [more ▼]

This chapter examines the role the British policy in Greece played in the shift in American foreign policy that was manifested in 1947-48, that led directly to these alliances, namely the Western European Union and NATO. To achieve this shift (which also included support of British strategic interests in the Eastern Mediterranean) this chapter argues that the British used Greece, first as a way to draw the United States further into European affairs, and then as a way to anchor the United States in Europe, achieving a guarantee of security for the Eastern Mediterranean and for Western Europe. Drawing on both published and unpublished British and American sources, this chapter will also examine perceptions of the conflicts in and about Greece, and what it represented for Western European and Eastern Mediterranean security, and Western ideas of democracy when confronted with supporting a right-wing Greek government. In so doing, it clarifies how American foreign policy changed from its pre-war focus on non-intervention, to the cold-war politics of containment and intervention. [less ▲]

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See detailTogether or Alone: The Price of Privacy in Collaborative Learinig
Pejo, Balazs UL; Tang, Qiang; Biczók, Gergely

in Proceedings on Privacy Enhancing Technologies (2019, July)

Machine learning algorithms have reached mainstream status and are widely deployed in many applications. The accuracy of such algorithms depends significantly on the size of the underlying training ... [more ▼]

Machine learning algorithms have reached mainstream status and are widely deployed in many applications. The accuracy of such algorithms depends significantly on the size of the underlying training dataset; in reality a small or medium sized organization often does not have the necessary data to train a reasonably accurate model. For such organizations, a realistic solution is to train their machine learning models based on their joint dataset (which is a union of the individual ones). Unfortunately, privacy concerns prevent them from straightforwardly doing so. While a number of privacy-preserving solutions exist for collaborating organizations to securely aggregate the parameters in the process of training the models, we are not aware of any work that provides a rational framework for the participants to precisely balance the privacy loss and accuracy gain in their collaboration. In this paper, by focusing on a two-player setting, we model the collaborative training process as a two-player game where each player aims to achieve higher accuracy while preserving the privacy of its own dataset. We introduce the notion of Price of Privacy, a novel approach for measuring the impact of privacy protection on the accuracy in the proposed framework. Furthermore, we develop a game-theoretical model for different player types, and then either find or prove the existence of a Nash Equilibrium with regard to the strength of privacy protection for each player. Using recommendation systems as our main use case, we demonstrate how two players can make practical use of the proposed theoretical framework, including setting up the parameters and approximating the non-trivial Nash Equilibrium. [less ▲]

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See detailExpansion nach Belgien als Verwaltungstätigkeit: der Kölner Beamte Franz Thedieck im NS
Brüll, Christoph UL

Scientific Conference (2019, June 28)

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See detailBenefits, challenges, social learning and controversies around Local Food Systems
Reckinger, Rachel UL; Nemes, Gusztav; Lajos, Veronika

Scientific Conference (2019, June 25)

Objectives: Our WG touches upon three main elements among the themes of the conference: (1) innovation, (2) social justice and (3) knowledge production. Innovative local food systems and alternative food ... [more ▼]

Objectives: Our WG touches upon three main elements among the themes of the conference: (1) innovation, (2) social justice and (3) knowledge production. Innovative local food systems and alternative food networks, approached from a collaborative and participatory angle, bring about a cultural shift by associating prosumers through a renewed form of trust, reciprocity and community, thus reinforcing social and ecological justice. At the same time, such heterodox actors in the transition to more sustainable food systems create new forms of knowledge, that are contested, co-constructed and potentially conflictual – along with enabling or disabling policymaking and, often, in dialogue with research. Our main objective is in this topic to start the process of creating an edited special issue of a peer reviewed journal (Sociologia Ruralis, Studies of Agricultural Economics or similar) should raise from this WG. We invite researchers working in the area of (local) food systems, alternative food networks, short food supply chains and related topics (rural tourism, community supported agriculture, etc.). We consider both the benefits and possible conflicts/problems in the connected socio-economic, cultural and environmental processes and welcome theoretical papers and case studies, too. Topic: By welcoming case studies from all geographical areas, in a comparative manner, this Working Group’s aim is to address different understandings and dynamics happening within and around different types of Local Food Systems (LFS). Alternative food networks, local food systems and short food supply chains have long been viewed as a sustainable, green way of raising the value added and creating opportunities for sur/re-vival of rural economy and society. They induce many benefits in terms of environmental impact, cultural exemplification, ethical entrepreneurship, social justice or rural development. Conceptually, LFS can be understood as ‘local food for local people’, as for example in the Slow Food or the community supported agriculture (CSA) movements. They are then associated with low food miles, environmental protection (Jones 2002), enhanced social networks and revitalised local communities (Fenstra 1997). From a local economic development perspective, in particular when LFS produce high quality products, they can equally be considered as ‘local food for non-local people’, either transported to urban centres, or attracting flows of tourists into rural areas. Here LFS can still enhance local businesses, economic and rural development, yet social and environmental benefits (Guthman 2004) of such foodstuffs, marketed with the added value of environmental and social responsibility, are more difficult to trace. Therefore, besides benefits, we would also like to analyse potential dissonances, that the distinction between local or extra-local target groups help to identify – for instance: • established, certified organic producers might criticize non-certified yet organically producing CSAs as fragmenting an already minority market or showing a lack of solidarity by not contributing to organic labels; • when LFS end up producing high quality, expensive products, a dynamic of social exclusion might occur, favoring the wealthy; • enhanced local production, tourism, and visitor pressure can cause social, economic, and environmental degradation, multiplier effects do not always occur to build more businesses and sustain social and economic capital; • innovative alternative food networks tend to struggle with territorial competition over land and resources, but if they rely on external investments, they might additionally be confronted – more insidiously – with the risk of co-option by neoliberal corporate agendas. We welcome analyses focusing 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, local and non-local appropriations as well regime hegemonies opens up the theoretical perspective of contested knowledge claims. We look for questions and answers including: • How are dynamics of “knowing and growing food in a contested arena” (Goodman, DuPuis, Goodman, 2014) negotiated – sometimes in a mutually enhancing and locally beneficial way, sometimes in more conflictual ways? • What are the local and extra-local stakeholders’ (producers, intermediaries, customers, tourists) different and often conflicting interests and responsibilities in LFS? • What can we learn from the tensions and local problems of LFS in order to support relevant policies to solve current controversies within the sector? • How can rural sociologists use their knowledge and influence to support local rural stakeholders of LFS? [less ▲]

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See detailNetworks and Governance of Local Food Systems. The case of Food Policy Councils
Reckinger, Rachel UL

Scientific Conference (2019, June 06)

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See detailA forcing fictitious domain/immersed boundary method for super-quadric shape of particulate flow simulation of cementitious material
Wu, Mingqiu UL; Peters, Bernhard UL; Dressler, Inka

Scientific Conference (2019, June 05)

Fictitious domain/immersed boundary method (FD/IBM) has recently been used for particulate flows and complex fluid-solid interaction problems. The advantage of FD/IBM over the body- fitted method is that ... [more ▼]

Fictitious domain/immersed boundary method (FD/IBM) has recently been used for particulate flows and complex fluid-solid interaction problems. The advantage of FD/IBM over the body- fitted method is that it substantially simplifies grid generation for immersed geometries, and it is easier to handle moving boundary situations. FD/IBM even allows the use of a stationary and non- deformation background mesh, as well as it reduces the cost of computation by avoiding generation of a body-fitted mesh for each time step. In this work, we develop a new platform to directly simulate super-quadric (SQ) particles in fluid based on a forcing fictitious domain method. Specifically, a super-quadric particle function is used to represent particle with varying shapes and sizes as encountered for concrete and mortar. The immersion of particles in fluid is handled by imposing a rigidity solid body motion in the particle domain, as well as adding a forcing term to the Navier-stokes equation by integral of pressure gradient and particle related velocity over the whole particle domain. Particle shapes are given by changing the super-quadric parameters of SQ equation. Particle motions, which occur during pumping of cementitious material, can be calculated and tracked by solving Newton’s equations of motions using the extended discrete element method (XDEM)[4] while the data of fluid flow properties are obtained by solving the Navier-Stokes equations which govern the fluid phase. Hence, a particle interface resolving solver is developed by coupling XDEM and IBM. We validate our solver by performing flow around particles and free falling of a particle in the channel at different parameters in 2D and 3D. The final objective of this work is to develop a particle-resolved direct numerical simulation platform to predict highly packed fluids with different shapes of particles and over a wide range of particle sizes. [less ▲]

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See detailIn CCP We Trust ... Or Do We? Assessing the Regulation of Central Clearing Counterparties in Europe
Nabilou, Hossein UL; Asimakopoulos, Ioannis UL

in Capital Markets Law Journal (2019), 14(3),

As part of financial market infrastructures, central counterparties (CCPs) have long been deemed systemically important and are likely to gain in importance due to the regulatory developments mandating ... [more ▼]

As part of financial market infrastructures, central counterparties (CCPs) have long been deemed systemically important and are likely to gain in importance due to the regulatory developments mandating central clearing for an increasing number of financial products. This paper focuses on the regulation as well as the recovery and resolution of CCPs in Europe. The existing CCP regulatory framework consists of ex-ante measures, including, among others, capital and liquidity requirements, initial and variation margins, and loss sharing mechanisms. In addition, the European proposal for the recovery and resolution of CCPs (the Proposal) contains several ex-post regulatory measures mainly in the form of rules for recovery and orderly resolution. Having studied the prudential regulatory measures for CCPs contained in the European Market Infrastructure Regulation and the ex-post recovery and resolution measures of the Proposal, this paper puts a spotlight on the specific shortcomings of the existing and proposed rules, in particular in terms of misaligned incentives, externalities, collective action problems, and certain practical impediments, and concludes that it would be misguided to inordinately rely on ex-post measures. Highlighting the limitations of the recovery and resolution mechanisms, this paper proposes that given the systemic importance of CCP functions, it is critical to improve the ex-ante measures whose objective is to prevent the failure of a CCP, rather than ex-post measures, which kick in after its failure. Accordingly, recommendations for making such improvements are proposed. [less ▲]

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See detailQuasitrivial semigroups: characterizations and enumerations
Couceiro, Miguel; Devillet, Jimmy UL; Marichal, Jean-Luc UL

in Semigroup Forum (2019), 98(3), 472498

We investigate the class of quasitrivial semigroups and provide various characterizations of the subclass of quasitrivial and commutative semigroups as well as the subclass of quasitrivial and order ... [more ▼]

We investigate the class of quasitrivial semigroups and provide various characterizations of the subclass of quasitrivial and commutative semigroups as well as the subclass of quasitrivial and order-preserving semigroups. We also determine explicitly the sizes of these classes when the semigroups are defined on finite sets. As a byproduct of these enumerations, we obtain several new integer sequences. [less ▲]

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