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See detailProperness for circle packings and Delaunay circle patterns on complex projective structures
Schlenker, Jean-Marc UL; Yarmola, Andrew UL

E-print/Working paper (2018)

We consider circle packings and, more generally, Delaunay circle patterns - arrangements of circles arising from a Delaunay decomposition of a finite set of points - on surfaces equipped with a complex ... [more ▼]

We consider circle packings and, more generally, Delaunay circle patterns - arrangements of circles arising from a Delaunay decomposition of a finite set of points - on surfaces equipped with a complex projective structure. Motivated by a conjecture of Kojima, Mizushima and Tan, we prove that the forgetful map sending a complex projective structure admitting a circle packing with given nerve (resp. a Delaunay circle pattern with given nerve and intersection angles) to the underlying complex structure is proper. [less ▲]

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See detailEin Rückblick auf die Zukunft. 25 Jahre Verkehrswende
Hesse, Markus UL

in Ökologisches Wirtschaften (2018), 33(2), 16-18

This paper (written in German) provides a reflection on a conceptual framework for transforming mobility policies and practices. It was developed in Germany in the context of the then emerging idea for ... [more ▼]

This paper (written in German) provides a reflection on a conceptual framework for transforming mobility policies and practices. It was developed in Germany in the context of the then emerging idea for transforming energy policies (Energiewende). The aim was to put together related concepts for the sustainable development of the demand for, and supply of, mobility and transport and related contexts (Verkehrswende). It was first presented in book format 25 years ago. On that occasion, and since the term has gained some attention and recognition in political realms recently, the concept is subject to a critical reflection from today's perspective. [less ▲]

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See detailAssociative, idempotent, symmetric, and order-preserving operations on chains
Devillet, Jimmy UL; Teheux, Bruno UL

E-print/Working paper (2018)

We characterize the associative, idempotent, symmetric, and order-preserving operations on (finite) chains in terms of properties of (the Hasse diagram of) their associated semilattice order. In ... [more ▼]

We characterize the associative, idempotent, symmetric, and order-preserving operations on (finite) chains in terms of properties of (the Hasse diagram of) their associated semilattice order. In particular, we prove that the number of associative, idempotent, symmetric, and order-preserving operations on an n-element chain is the nth Catalan number. [less ▲]

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See detailIdentifying the Cognitive Mechanism Behind Breaks in Presence using Measures of Attention
Holl, Elisabeth UL; Huber, Kerstin; Liebold, Benny et al

Scientific Conference (2018, May 28)

Presence is the perceptual illusion of non-mediation in virtual environments with breaks in presence (BIPs) marking events where the user’s attention is shifted away from the virtual to the physical ... [more ▼]

Presence is the perceptual illusion of non-mediation in virtual environments with breaks in presence (BIPs) marking events where the user’s attention is shifted away from the virtual to the physical environment. Using the concept of BIP allows to investigate specific episodes during virtual encounters, where the state of presence is interrupted. Orienting responses have been identified as a promising cognitive mechanism behind BIPs. However, the differences of orienting to narrative stimuli versus BIPs remains to be investigated. In the current study, we combined established psychophysiological measures of orienting (ECG, GSR) with psychophysiological (pupil dilation) and behavioral measures (STRT) of attention. BIPs are considered to elicit stronger orienting responses and require more cognitive resources. In an experiment, participants navigated through a virtual environment while having to react to narrative and external (BIPs) stimuli. While the data collection has been completed, results from the analysis will be discussed at the conference. [less ▲]

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See detailSmartCheck: Static Analysis of Ethereum Smart Contracts
Tikhomirov, Sergei UL; Voskresenskaya, Ekaterina; Ivanitskiy, Ivan et al

Scientific Conference (2018, May 27)

Ethereum is a major blockchain-based platform for smart contracts – Turing complete programs that are executed in a decentralized network and usually manipulate digital units of value. Solidity is the ... [more ▼]

Ethereum is a major blockchain-based platform for smart contracts – Turing complete programs that are executed in a decentralized network and usually manipulate digital units of value. Solidity is the most mature high-level smart contract language. Ethereum is a hostile execution environment, where anonymous attackers exploit bugs for immediate financial gain. Developers have a very limited ability to patch deployed contracts. Hackers steal up to tens of millions of dollars from flawed contracts, a well-known example being “The DAO“, broken in June 2016. Advice on secure Ethereum programming practices is spread out across blogs, papers, and tutorials. Many sources are outdated due to a rapid pace of development in this field. Automated vulnerability detection tools, which help detect potentially problematic language constructs, are still underdeveloped in this area. We provide a comprehensive classification of code issues in Solidity and implement SmartCheck – an extensible static analysis tool that detects them. SmartCheck translates Solidity source code into an XML-based intermediate representation and checks it against XPath patterns. We evaluated our tool on a big dataset of real-world contracts and compared the results with manual audit on three contracts. Our tool reflects the current state of knowledge on Solidity vulnerabilities and shows significant improvements over alternatives. SmartCheck has its limitations, as detection of some bugs requires more sophisticated techniques such as taint analysis or even manual audit. We believe though that a static analyzer should be an essential part of contract developers’ toolbox, letting them fix simple bugs fast and allocate more effort to complex issues. [less ▲]

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See detailTranslanguaging and Linguistic Creativity and Criticality
Aleksic, Gabrijela UL

Presentation (2018, May 25)

Translanguaging (TL) pedagogy is the strategic deployment of the entire linguistic and non-linguistic repertoire for learning and teaching (García & Seltzer 2016). Particular educational advantages of ... [more ▼]

Translanguaging (TL) pedagogy is the strategic deployment of the entire linguistic and non-linguistic repertoire for learning and teaching (García & Seltzer 2016). Particular educational advantages of translanguaging are: (1) deeper and fuller understanding of the subject matter, (2) helps the development of the weaker language, (3) facilitates home-school links and cooperation, and (4) helps the integration of fluent speakers with early learners (García & Li Wei 2014, p. 67). TL is transformative for the child, for the teacher and the whole education. TL space develops the sense of connectedness (Li Wei 2011b) which is important for children's cognitive, linguistic, and socio-emotional development. By the use of the whole linguistic repertoire children can develop criticality and creativity. According to García and Li Wei (2014), creativity is "pushing and breaking the boundaries between the old and the new, the conventional and the original, and the acceptable and the challenging". (p. 67) while criticality is "the ability to use available evidence appropriately, systematically and insightfully, to inform considered views of cultural, social, political and linguistic wisdom, to question and problematize received wisdom and to express views adequately through reasoned responses to situations" (p. 67). The development of creativity and criticality are important skills for children's education and translanguaging pedagogy creates space for the development of these skills. [less ▲]

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See detailStadtplanung trifft Sozialunternehmen
Schmid, Benedikt UL; Schulz, Christian UL

Article for general public (2018)

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See detailPrivacy-preserving KYC on Ethereum
Biryukov, Alex UL; Khovratovich, Dmitry; Tikhomirov, Sergei UL

Scientific Conference (2018, May 09)

Identity is a fundamental concept for the financial industry. In order to comply with regulation, financial institutions must verify the identity of their customers. Identities are currently handled in a ... [more ▼]

Identity is a fundamental concept for the financial industry. In order to comply with regulation, financial institutions must verify the identity of their customers. Identities are currently handled in a centralized way, which diminishes users' control over their personal information and threats their privacy. Blockchain systems, especially those with support for smart contracts (e.g.,~Ethereum), are expected to serve as a basis of more decentralized systems for digital identity management. We propose a design of a privacy-preserving KYC scheme on top of Ethereum. It would let providers of financial services leverage the potential of blockchain technology to increase efficiency of customer onboarding while complying with regulation and protecting users' privacy. [less ▲]

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See detailBrexit and the battle for financial services
Howarth, David UL; Quaglia, Lucial

in Journal of European Public Policy (2018), 25(8), 1118-1136

This paper analyses the policy developments concerning the Single Market in finance in the context of Brexit. Theoretically, we engage with two bodies of work that make contrasting predictions on European ... [more ▼]

This paper analyses the policy developments concerning the Single Market in finance in the context of Brexit. Theoretically, we engage with two bodies of work that make contrasting predictions on European financial market integration and the development of European Union (EU)policies on financial regulation: on focused upon a neo-mercantilist ‘battle’ amongst member states and the other stressing the importance of transnational financial networks (or coalitions). Empirically, we find limited evidence of the formation of crossnational alliances in favour of the United Kingdom (UK) retaining broad access to the EU Single Market in financial services, the presence of which would have aligned with the expectations of analyses focused upon transnational networks. By contrast, the main financial centres in the EU27 and their national authorities competed to lure financial business away from the UK — what we explain in terms of a ‘battle’ amongst member states and their national financial centres. [less ▲]

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See detailInnovation in Outer Space: International and African Legal Perspective
Hofmann, Mahulena UL; Blount, Percy UL

Book published by Nomos/ Hart - 1st (2018)

The innovation of technology connected with the use of outer space and telecommunication require new approaches to the present international space law and telecommunications law. Specific attention is ... [more ▼]

The innovation of technology connected with the use of outer space and telecommunication require new approaches to the present international space law and telecommunications law. Specific attention is devoted to the space and telecommunication legislation in the countries of the African continent. [less ▲]

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See detailSpace Resources: Regulatory Aspects
Hofmann, Mahulena UL

in Hofmann, Mahulena; Blount, Percy (Eds.) Innovation in Outer Space: International and African Legal Perspectives (2018)

Space Resources activities are expanding. The US and Luxembourg adopted national legislation enabling their authorization. The chapter discusses the international legal framework of space resources ... [more ▼]

Space Resources activities are expanding. The US and Luxembourg adopted national legislation enabling their authorization. The chapter discusses the international legal framework of space resources activities, and their reflect in national US and Luxembourg legislation. [less ▲]

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See detail"Chosen Fighters of the Jewish People": Jewish volunteers in the International Brigades during the Spanish Civil War
Zaagsma, Gerben UL

Presentation (2018, April 05)

During the Spanish Civil War (1936-1939) around 35000 volunteers from many countries fought in the so-called International Brigades that were created and organised by the Communist International. Roughly ... [more ▼]

During the Spanish Civil War (1936-1939) around 35000 volunteers from many countries fought in the so-called International Brigades that were created and organised by the Communist International. Roughly 4000 of these volunteers were of Jewish descent. In december 1937, the Jewish Naftali Botwin company was formed within the 13th Polish Dombrowski Brigade as a result of lobbying efforts by Polish-Jewish migrant communists in Paris. In their daily newspaper, Naye Prese, the company’s existence became an important part of the propaganda battle waged on the ‘Jewish street’ in Paris in support of the Comintern’s post-1935 Popular Front tactic. But while the propaganda was unmistakably communist, the subtext became increasingly Jewish in the course of the war. Indeed, against a background of age-old allegations of ‘Jewish cowardice’, Naye Prese consistently emphasised that the fight of Jewish volunteers, symbolised by the Botwin Company, had an emancipatory dimension: Jews were worthy and equal fighters. Their participation simultaneously served as a model of Jewish action to be emulated by Jewish migrants in France as they sought to negotiate increasingly difficult living circumstances. After World War II and the Holocaust, the memory of Jewish volunteers became decisively shaped by debates on Jewish responses to fascism and Nazism; their participation was inscribed in a broader narrative of Jewish resistance that aimed to counter the myth of Jewish passivity in the face of the Nazi onslaught. To put it succinctly: ‘Spain’ served to prove that Jews did not go like “sheep to the slaughter” but already resisted Hitler in Spain. Based upon my scholarship on Jewish volunteers in the International Brigades, the aim of this paper, then, is to analyze the symbolic meaning of their participation, and show the various ways in which the qualification ‘Jewish’ was and has been imbued with meaning, both during and after the Spanish Civil War. Ultimately, I will show how volunteers of Jewish descent during the Spanish Civil War became Jewish volunteers after the Holocaust. [less ▲]

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See detailL’aménagement du territoire transfrontalier en pratique: Réflexions pour un dialogue entre chercheurs et praticiens de la Grande Région
Bechtold, Joshua; Caesar, Beate; Christmann, Nathalie UL et al

Diverse speeches and writings (2018)

Avec une coopération initiée dans les années 1970, la Grande Région est considérée comme l’un des espaces transfrontaliers les plus emblématiques au sein de l’Union européenne. L’aménagement du territoire ... [more ▼]

Avec une coopération initiée dans les années 1970, la Grande Région est considérée comme l’un des espaces transfrontaliers les plus emblématiques au sein de l’Union européenne. L’aménagement du territoire constitue un élément essentiel de ses thématiques de coopération. Cependant, l'importance grandissante de ce champ d'action demeure relativement peu documentée d'un point de vue transfrontalier. Cette thématique reste principalement abordée sous l’angle réglementaire et institutionnel. Le présent policy paper postule qu’au-delà des règlementations, des plans et des schémas, l’aménagement du territoire transfrontalier résulte également d’une pratique visant à anticiper l’organisation d’une société dans un espace donné. Après une présentation sommaire des grandes étapes de la coopération dans le domaine de l’aménagement du territoire transfrontalier au sein de la Grande Région, le présent policy paper présente les résultats d’un exercice de recherche expérimentale réalisé en 2017, essentiellement sous la forme d’un jeu de simulation (« Planspiel »). Les principales conclusions analytiques de cet échange sont ensuite mises en lumière. Pour conclure, le document dresse une liste de recommandations basées sur l’analyse des résultats des travaux de recherche. [less ▲]

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See detailINVESTIGATION OF THE CU(SN,GE)S3 TERNARY ALLOY FOR THIN FILM SOLAR CELLS
Robert, Erika UL

Doctoral thesis (2018)

This thesis examines material properties of the novel Cu2(Sn, Ge)S3 alloy, from the perspective of a solar cell scientist searching for a new light absorbing material to produce highly efficient thin-film ... [more ▼]

This thesis examines material properties of the novel Cu2(Sn, Ge)S3 alloy, from the perspective of a solar cell scientist searching for a new light absorbing material to produce highly efficient thin-film devices. [less ▲]

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See detailOpinion Statement ECJ-TF 3/2017 on the Decision of the Court of Justice of the European Union of 16 May 2017 in Berlioz Investment Fund SA (Case C-682/15), Concerning the Right to Judicial Review under Article 47 of the EU Charter of Fundamental Rights in Cases of Cross-Border Mutual Assistance in Tax Matters
Haslehner, Werner UL; García Prats, Alfredo; Heydt, Volker et al

in European Taxation (2018)

The CFE welcomes this decision in that it marks a new page in the protection of taxpayer rights. In line with the principle “wherever there is a right, there is a remedy”, it shows that EU law may ... [more ▼]

The CFE welcomes this decision in that it marks a new page in the protection of taxpayer rights. In line with the principle “wherever there is a right, there is a remedy”, it shows that EU law may reconcile the interest in securing an effective protection of tax collection with that in respecting fundamental rights. The CFE wonders whether the threshold of “manifest irrelevance” can effectively secure the protection of the relevant persons’ rights. It also wonders whether this offers an effective protection against fishing expeditions or requests for information that is unlikely to be relevant to the tax affairs of a given taxpayer. [less ▲]

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