References of "2018"
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See detailGermany, Greece and Poland: The Complicated story of Reparations and their impact on European (dis?) Integration,
Paravantis, Spero UL

in Paravantis, Spero (Ed.) BENELUX, Europe and the Cold War: Asymmetrical cold war power relations in the Integration process of Europe (2018)

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See detailPierre Werner and Europe: The Family Archives Behind the Werner Report.
Danescu, Elena UL

Book published by Palgrave Macmillan (2018)

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See detailJewish responses to anti-Semitism in Paris and London in the late 1930s as European Jewish political history
Zaagsma, Gerben UL

in Bajohr, Frank; Löw, Andrea; Wirsching, Andreas (Eds.) Right-Wing Politics and the Rise of Antisemitism in Europe 1935-1941 (2018)

This article compares Jewish responses to antisemitism in Paris and London in the late 1930s, when antisemitism was on the rise in both France and the United Kingdom. There were striking similarities in ... [more ▼]

This article compares Jewish responses to antisemitism in Paris and London in the late 1930s, when antisemitism was on the rise in both France and the United Kingdom. There were striking similarities in these responses, yet local contexts and circumstances dominate the historiographies of both cases. The main aim of this article, then, is not so much to offer new insights into the individual cases (both of which have been abundantly analyzed in historical research), but rather to fill a gap by examining the broader factors that account for these similarities. On the one hand, the article examines the nature of Jewish self-identification in the post-Emancipation era and its effects on the political cultures, practices, and identifications of the actors that were involved; on the other, it explores the way in which these practices were also shaped by migration and transnational aspects. Ultimately, this case study will argue for a comparative and transnational approach to Jewish political history in order to arrive at a better understanding of its diverse configurations and permutations. [less ▲]

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See detailNumerical check of the Meyerhof bearing capacity equation for shallow foundations
Van Baars, Stefan UL

in Innovative Infrastructure Solutions (2018), 3(9), 1-13

Most geotechnical design codes and books use the equations of Meyerhof or Terzaghi to calculate shallow foundations. These equations are based on the failure mechanism published by Prandtl for shallow ... [more ▼]

Most geotechnical design codes and books use the equations of Meyerhof or Terzaghi to calculate shallow foundations. These equations are based on the failure mechanism published by Prandtl for shallow strip foundations. The common idea is that failure of a footing occurs in all cases according to a Prandtl-wedge failure mechanism. To check the failure mechanism and the equations of the currently used bearing capacity factors and correction factors, a large number of finite-element calculations of strip and circular footings have been made. The finite-element calculations show that in cases of soils with high friction angles, soils without cohesion or a surcharge, footings with inclined loading or circular footings, not the Prandtl-wedge failure mechanism, but other failure mechanisms occur. In addition, the currently used equations for the bearing capacity factors and correction factors are too high. Therefore, new equations have been presented in this article. For some correction factors, for example, the inclination factors and the cohesion slope factor, an analytical solution is found. [less ▲]

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See detailKnowledge Graph-based Core Concept Identification in Learning Resources
Manrique, Rubén; Grevisse, Christian UL; Mariño, Olga et al

in 8th Joint International Conference, JIST 2018, Awaji, Japan, November 26–28, 2018, Proceedings (2018, December)

The automatic identification of core concepts addressed by a learning resource is an important task in favor of organizing content for educational purposes and for the next generation of learner support ... [more ▼]

The automatic identification of core concepts addressed by a learning resource is an important task in favor of organizing content for educational purposes and for the next generation of learner support systems. We present a set of strategies for core concept identification on the basis of a semantic representation built using the open and available knowledge in the so-called Knowledge Graphs (KGs). Different unsupervised weighting strategies, as well as a supervised method that operates on the semantic representation, were implemented for core concept identification. In order to test the effectiveness of the proposed strategies, a human-expert annotated dataset of 96 learning resources extracted from MOOCs was built. In our experiments, we show the capacity of the semantic representation for the core-concept identification task as well as the superiority of the supervised method. [less ▲]

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See detailLuxembourg - The Constitution of Luxembourg in the Context of EU and International Law as ‘Higher Law’
Gerkrath, Jörg UL

in Bardutzky, Samo; Albi, Anneli (Eds.) National constitutions in European and Global Governance: Democracy, Rights, the rule of law (2018)

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See detailSuccessive convex approximation algorithms for sparse signal estimation with nonconvex regularizations
Yang, Yang UL; Pesavento, Marius; Chatzinotas, Symeon UL et al

in IEEE Journal of Selected Topics in Signal Processing (2018), 12(6), 1-19

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See detailCollaborative Data Delivery for Smart City-oriented Mobile Crowdsensing Systems
Vitello, Piergiorgio; Capponi, Andrea UL; Fiandrino, Claudio UL et al

in IEEE Global Communications Conference (GLOBECOM), Abu Dhabi, UAE, 2018 (2018, December)

The huge increase of population living in cities calls for a sustainable urban development. Mobile crowdsensing (MCS) leverages participation of active citizens to improve performance of existing sensing ... [more ▼]

The huge increase of population living in cities calls for a sustainable urban development. Mobile crowdsensing (MCS) leverages participation of active citizens to improve performance of existing sensing infrastructures. In typical MCS systems, sensing tasks are allocated and reported on individual-basis. In this paper, we investigate on collaboration among users for data delivery as it brings a number of benefits for both users and sensing campaign organizers and leads to better coordination and use of resources. By taking advantage from proximity, users can employ device-to-device (D2D) communications like Wi-Fi Direct that are more energy efficient than 3G/4G technology. In such scenario, once a group is set, one of its member is elected to be the owner and perform data forwarding to the collector. The efficiency of forming groups and electing suitable owners defines the efficiency of the whole collaborative-based system. This paper proposes three policies optimized for MCS that are compliant with current Android implementation of Wi-Fi Direct. The evaluation results, obtained using CrowdSenSim simulator, demonstrate that collaborative-based approaches outperform significantly individual-based approaches. [less ▲]

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See detailBENELUX, Europe and the Cold War: Asymmetrical Cold War Power Relations and the Integration Process of Europe
Paravantis, Spero UL

Book published by IB Tauris (2018)

What was/is European security in the context of the Cold War? How was and is it conceived? What role did “non-powers” play in European security, and how did they help define it? These were the main ... [more ▼]

What was/is European security in the context of the Cold War? How was and is it conceived? What role did “non-powers” play in European security, and how did they help define it? These were the main questions discussed during the conference held by the C²DH in March 2017. This edited volume brings together the final, peer-reviewed contributions of the participants, and brings them together in a common publication. [less ▲]

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See detailSequential Resource Distribution Technique for Multi-User OFDM-SWIPT based Cooperative Networks
Gautam, Sumit UL; Lagunas, Eva UL; Chatzinotas, Symeon UL et al

Scientific Conference (2018, December)

In this paper, we investigate resource allocation and relay selection in a dual-hop orthogonal frequency division multiplexing (OFDM)-based multi-user network where amplify-and-forward (AF) enabled relays ... [more ▼]

In this paper, we investigate resource allocation and relay selection in a dual-hop orthogonal frequency division multiplexing (OFDM)-based multi-user network where amplify-and-forward (AF) enabled relays facilitate simultaneous wireless information and power transfer (SWIPT) to the end-users. In this context, we address an optimization problem to maximize the end-users’ sum-rate subjected to transmit power and harvested energy constraints. Furthermore, the problem is formulated for both time-switching (TS) and power-splitting (PS) SWIPT schemes.We aim at optimizing the users’ SWIPT splitting factors as well as sub-carrier–destination assignment, sub-carrier pairing, and relay–destination coupling metrics. This kind of joint evaluation is combinatorial in nature with non-linear structure involving mixed-integer programming. In this vein, we propose a sub-optimal low complex sequential resource distribution (SRD) method to solve the aforementioned problem. The performance of the proposed SRD technique is compared with a semi-random resource allocation and relay selection approach. Simulation results reveal the benefits of the proposed design under several parameter values with various operating conditions to illustrate the efficiency of SWIPT schemes for the proposed techniques. [less ▲]

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See detailSocial Change for Sustainable Localized Food Sovereignty. Convergence between Prosumers and Ethical Entrepreneurs.
Reckinger, Rachel UL

in Sociologia del Lavoro (2018), 152(4),

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

Recently, some resourceful community-driven initiatives for local food production and retail have arisen in Luxembourg, where low organic agricultural rates are paradoxically paired with high consumer demands. This niche of social innovators is combining agro-ecology with circular economy practices. Four cases of alternative food networks are of interest – studied with qualitative interviews and participant observation. One has been established since the 1980s with 200 employees, partly in social insertion measures. The more recent and smaller initiatives are characterized by a cooperative governance, a community-supported agricultural outlook, hands-on workshops and time-banks, all enabled by social media. These initiatives are more radical in their agro-ecological or permaculture practices, focusing on regenerative land use without relying on imports and fostering the integration of consumers with varying degrees of prosumer involvement, as a politicized step further than mere (possibly industrialized) organic production. [less ▲]

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See detailOsiris: Hunting for Integer Bugs in Ethereum Smart Contracts
Ferreira Torres, Christof UL; Schütte, Julian; State, Radu UL

in 34th Annual Computer Security Applications Conference (ACSAC ’18), San Juan, Puerto Rico, USA, December 3-7, 2018 (2018, December)

The capability of executing so-called smart contracts in a decentralised manner is one of the compelling features of modern blockchains. Smart contracts are fully fledged programs which cannot be changed ... [more ▼]

The capability of executing so-called smart contracts in a decentralised manner is one of the compelling features of modern blockchains. Smart contracts are fully fledged programs which cannot be changed once deployed to the blockchain. They typically implement the business logic of distributed apps and carry billions of dollars worth of coins. In that respect, it is imperative that smart contracts are correct and have no vulnerabilities or bugs. However, research has identified different classes of vulnerabilities in smart contracts, some of which led to prominent multi-million dollar fraud cases. In this paper we focus on vulnerabilities related to integer bugs, a class of bugs that is particularly difficult to avoid due to some characteristics of the Ethereum Virtual Machine and the Solidity programming language. In this paper we introduce Osiris – a framework that combines symbolic execution and taint analysis, in order to accurately find integer bugs in Ethereum smart contracts. Osiris detects a greater range of bugs than existing tools, while providing a better specificity of its detection. We have evaluated its performance on a large experimental dataset containing more than 1.2 million smart contracts. We found that 42,108 contracts contain integer bugs. Be- sides being able to identify several vulnerabilities that have been reported in the past few months, we were also able to identify a yet unknown critical vulnerability in a couple of smart contracts that are currently deployed on the Ethereum blockchain. [less ▲]

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See detailPower and Load Optimization in Interference-Coupled Non-Orthogonal Multiple Access Networks
Lei, Lei UL; You, Lei; Yang, Yang UL et al

in IEEE Global Communications Conference (GLOBECOM) 2018 (2018, December)

Detailed reference viewed: 31 (5 UL)
See detailQualitätskonstruktionen - Zur Verarbeitung divergierender Qualitätsanforderungen in der Jugendarbeit
Biewers, Sandra UL

Book published by Beltz Juventa (2018)

Formale Verfahren zur Sicherung von Qualität in sozialpädagogischen Organisationen stehen meist in einem engen Zusammenhang mit Fragen der Wirtschaftlichkeit. Ob sie auch in der pädagogischen Praxis ... [more ▼]

Formale Verfahren zur Sicherung von Qualität in sozialpädagogischen Organisationen stehen meist in einem engen Zusammenhang mit Fragen der Wirtschaftlichkeit. Ob sie auch in der pädagogischen Praxis nutzbringend zur Anwendung kommen und aus ihnen auch fachliche Innovationen hervorgehen, steht aber häufig in Zweifel. Das vorliegende Buch befasst sich mit dieser Frage aus der Perspektive der sozialpädagogischen Praxis. Vorgestellt wird eine empirische Studie, die mit Rekurs auf neoinstitutionalistische Theoriekonzepte untersucht, anhand welcher Strategien Fachkräfte in der Offenen Jugendarbeit die meist von staatlicher Seite definierten Qualitätskriterien und -regeln in ihrem Praxisalltag aufgreifen und ob bzw. inwiefern sie diese nach professionellen Anforderungen reinterpretieren und transformieren [less ▲]

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See detailLiebe - Krankheit - Wahn: Lyrische Spielarten im Minnesang
Bendheim, Amelie UL

Speeches/Talks (2018)

„Die Liebe verwundet, die Liebe fesselt, die Liebe macht krank, die Liebe lässt schwach werden.“ Dieser ursprünglich theologisch geprägte Gedanke über die Gewalt der Liebe, lässt sich – auf seinen ... [more ▼]

„Die Liebe verwundet, die Liebe fesselt, die Liebe macht krank, die Liebe lässt schwach werden.“ Dieser ursprünglich theologisch geprägte Gedanke über die Gewalt der Liebe, lässt sich – auf seinen bildlichen Kern reduziert – in zahllosen Varianten in der Weltliteratur aufspüren. Eine besonders auffällige Form scheinen dabei jene Texte zu bieten, die Liebe nicht allein als Auslöser, sondern gar selbst als Krankheit darstellen – zumindest implizit, insofern der Zustand des Verliebtseins mit dem Zustand der Krankheit gleichgesetzt wird. Wohl bekannt sind die körperlichen Symptome dieses Liebeszustandes, die in ihrer klassischen Ausprägung im Erbleichen, Erröten, Zittern, in Sprachlähmung sowie im Bluten aus der Nase bestehen und im Mittelalter als minnesiech bezeichnet werden. Erscheint die Liebeskrankheit im Minnesang noch vornehmlich in metaphorischem Gebrauch (s. das gequälte Herz als Beispiel für den Schmerz der Minne), weisen spätere Wörterbucheinträge (vgl. hierzu die Lemmata ‚Liebesfieber’ oder ‚Jungfernkrankheit’) wiederum auf ein stärker körperlich-physiologisches und auch sexuell-erotisches Verständnis von Liebe hin. Krank macht die Minne nun vor allem – und dem mittelalterlichen medizinischen Duktus der Humoralpathologie folgend – dann, wenn das körperliche Begehren nicht befriedigt werden kann. Der hier skizzierte Vortrag will die Vorstellung von Krankheit in einem größeren semantischen Beziehungsgeflecht in den Blick nehmen, das sich in der mhd. Lyrik in bedeutender Weise hervortut: der Verbindung Liebe – Krankheit – Wahn. Der wân als zentrales Symptom der Minnekrankheit löst – so die hier zu erprobende These –den Geist vom versehrten Körper und definiert damit den Übergang von der körperlichen Krankheit(smetapher) zu einer seelischen Zustandsbeschreibung. Die sprachhistorische Herleitung von mhd. wân vermag diese Beobachtung weiter zu untermauern, insofern der Begriff ein zunächst wertneutrales, semantisch vielfältiges Bedeutungsspektrum impliziert, und sich mit ‚Hoffnung, Zuversicht oder Einbildungskraft’ ins Nhd. übertragen ließe. Im krankhaften Minne-wân öffnen sich Denkräume, denen der Minnesang eine literarische Ausgestaltung verleiht; Minne-wân führt damit nicht nur zu körperlicher Versehrtheit, sondern ist eben auch guoter wân, lieber wân, saelden wân – und damit einer der ersten ‚Testräume’ für die Erprobung gedanklicher Spielarten des lyrischen Ichs in der deutschen Dichtung überhaupt. [less ▲]

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See detailConcrete-Filled Steel Tubular (CFTS) Columns Subjected to Eccentric Compressive Load
KEDZIORA, SLAWOMIR UL; Anwaar, Muhammad Omer

in AIP Conference Proceedings (2018, November 15)

Concrete-steel composite structures are very efficient in carrying high loads as they combine benefits of both materials concrete and steel. The combination of them can significantly improve the strength ... [more ▼]

Concrete-steel composite structures are very efficient in carrying high loads as they combine benefits of both materials concrete and steel. The combination of them can significantly improve the strength of the composite structure by taking advantage of high compression resistance of concrete and high strength of steel in tension. Recently, there has been renewed interest in the composite structures used in different forms, as beams, slabs, sandwich structures and columns and many methods of structural analyses were utilised. However, none of them was able to eliminate concrete material when it fractured. The presented work concerns circular composite columns CFST under eccentric compression. The principal objective of the project was to investigate a straightforward method based on a finite element analysis employed to estimate the load carrying capacity of columns. This study has also been set out to determine whether the Drucker-Prager material model of concrete without a crack capability could be used for analyses of the CFST columns with the additional elimination of the concrete material when concrete is damaged. The elaborated finite element model was verified with existing test data from the literature. The findings show that the correlation between the test results and the numerical analysis was excellent confirming the feasibility of usage of the proposed method for the assessment of complex cases of the CFST columns. A new part of the work is the employment of a death element feature to eliminate concrete material, which theoretically is not taking any load after reaching its tensile strength. A criterion to eliminate elements from the model is the maximum principal stress greater than tensile strength. The obtained results are excellent; the established goal was met entirely. [less ▲]

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