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See detailZwischen Konformität und Handlungsmacht: Ein Blick auf die Verarbeitungspraxis von Qualitätsvorgaben in der Offenen Kinder- und Jugendarbeit
Biewers, Sandra UL

in Deinet, Ulrich; Sturzenhecker, Benedikt (Eds.) Handbuch Offene Kinder- und Jugendarbeit (in press)

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See detailA Generic Approach for Solving Nonlinear-Discrete Security-Constrained Optimal Power Flow Problems in Large-Scale Systems
Platbrood, Ludovic; Capitanescu, Florin UL; Merckx, Christian et al

in IEEE Transactions on Power Systems (in press)

This paper proves the practicality of an iterative algorithm for solving realistic large-scale SCOPF problems. This algorithm is based on the combination of a contingency filtering scheme, used to ... [more ▼]

This paper proves the practicality of an iterative algorithm for solving realistic large-scale SCOPF problems. This algorithm is based on the combination of a contingency filtering scheme, used to identify the binding contingencies at the optimum, and a network compression method, used to reduce the complexity of the post-contingency models included in the SCOPF formulation. We show that by combining these two complementary ideas, it is possible to solve in a reasonable time SCOPF problems on large power system models with a large number of contingencies. Unlike most results reported for large-scale SCOPF problems, our algorithm uses a non-linear AC network model in both pre-contingency and post-contingency states, optimizes both active/reactive powers flows jointly, and treats the discrete variables. The proposed algorithm is implemented with state-of-the-art solvers and applied to two systems: a national grid with 2563 buses and 1297 contingencies, and a model of the European transmission network with 9241 buses and 12000 contingencies. [less ▲]

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See detailStudents' immigration background as a moderator of predictive validity of tracking decisions.
Klapproth, Florian UL; Schaltz, Paule UL

in Procedia Social and Behavioral Sciences (in press)

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See detailMultiple Sets Exponential Concentration and Higher Order Eigenvalues
Gozlan, Nathael; Herry, Ronan UL

in Potential Analysis (in press)

On a generic metric measured space, we introduce a notion of improved concentration of measure that takes into account the parallel enlargement of k distinct sets. We show that the k-th eigenvalues of the ... [more ▼]

On a generic metric measured space, we introduce a notion of improved concentration of measure that takes into account the parallel enlargement of k distinct sets. We show that the k-th eigenvalues of the metric Laplacian gives exponential improved concentration with k sets. On compact Riemannian manifolds, this allows us to recover estimates on the eigenvalues of the Laplace-Beltrami operator in the spirit of an inequality of Chung, Grigor’yan & Yau, Upper bounds for eigenvalues of the discrete and continuous Laplace operators. Adv. Math. 117(2), 165–178 (1996). [less ▲]

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See detailFamiliale Generationsbeziehungen (international)
Albert, Isabelle UL; Schwarz, Beate; Mayer, Boris et al

in Ecarius, Jutta; Schierbaum, Anja (Eds.) Handbuch Familie: Bildung, Erziehung und sozialpädagogische Arbeitsfelder (in press)

Der vorliegende Beitrag beschäftigt sich mit intergenerationalen Familienbeziehungen im Kulturvergleich. Nach einer Einführung in grundlegende theoretische Modelle und Forschungstraditionen werden im ... [more ▼]

Der vorliegende Beitrag beschäftigt sich mit intergenerationalen Familienbeziehungen im Kulturvergleich. Nach einer Einführung in grundlegende theoretische Modelle und Forschungstraditionen werden im zweiten Teil Forschungsprojekte und -ergebnisse zur Ausgestaltung von Generationsbeziehungen in verschiedenen kulturellen Kontexten und im Zusammenhang mit Migration aufgezeigt sowie die Bedeutung von gesellschaftlichen Rahmenbedingungen für die Ausgestaltung von familiären Generationsbeziehungen dargelegt. [less ▲]

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See detail“That’s a value I would transmit in some way, but how concretely, I don’t know” – Intergenerational value transfer revisited in light of memory
Albert, Isabelle UL; Barros, Stephanie; Boulanger, Dany

in Wagoner, Brady; Bresco, I.; Zadeh, S. (Eds.) Memory in the Wild (in press)

Intergenerational value transmission occurs widely and to a large extent within the family as primary socialization agent. In families, children are confronted with specific practices, paradigms, rules ... [more ▼]

Intergenerational value transmission occurs widely and to a large extent within the family as primary socialization agent. In families, children are confronted with specific practices, paradigms, rules and routines which are part of their family culture (Albert & Barros Coimbra, 2017) and as such family is a mediator between societal/cultural and individual values. The ability to transmit values is essential for collective knowledge and memory, the continuity of value orientations being a main feature of intergenerational relations that enables members of different generations to communicate with each other (Barni, Rosnati, & Ranieri, 2013; Halbwachs, 1941/1992; Schönpflug, 2001). Intergenerational transmission of values becomes particularly complex in the context of migration or in times of rapid social change. On the one hand, family identity and traditions might provide a secure base in light of a changing context, and parents might find it important to transmit traditional values to the next generation in order to keep memories alive. At the same time, they might feel that their children should adapt to the changed cultural context, resulting in a (not always clear) dilemma about what they want for their children. How can migrant parents reconcile or move between the different collective frameworks of their culture of origin and the receiving culture (Middleton & Brown, 2005)? In the following, we will first give a brief overview over research in the area of intergenerational value transmission, and we will second illustrate and further inform our theoretical assumptions by identifying related themes and phenomena in our qualitative dyadic interviews. Then, we will delve into memory as a horizon that is emerging out of the analysis as a transversal theme. From this point of view, we continue the analysis and progressively integrate the notions pertaining to the role of memory in the intergenerational transmission of values. Aspects of cultural background are apparent in the excerpts that we will quote supporting the themes we will refer to. We will more explicitly return to this in our conclusions. [less ▲]

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See detailA Survey of Challenges for Runtime Verification from Advanced Application Domains (Beyond Software)
Sánchez, César; Schneider, Gerardo; Ahrendt, Wolfgang et al

in Formal Methods in System Design (in press)

Runtime verification is an area of formal methods that studies the dynamic analysis of execution traces against formal specifications. Typically, the two main activities in runtime verification efforts ... [more ▼]

Runtime verification is an area of formal methods that studies the dynamic analysis of execution traces against formal specifications. Typically, the two main activities in runtime verification efforts are the process of creating monitors from specifications, and the algorithms for the evaluation of traces against the generated monitors. Other activities involve the instrumentation of the system to generate the trace and the communication between the system under analysis and the monitor. Most of the applications in runtime verification have been focused on the dynamic analysis of software, even though there are many more potential applications to other computational devices and target systems. In this paper we present a collection of challenges for runtime verification extracted from concrete application domains, focusing on the difficulties that must be overcome to tackle these specific challenges. The computational models that characterize these domains require to devise new techniques beyond the current state of the art in runtime verification. [less ▲]

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See detailUpdate Internationales und Europäisches Steuerrecht
Sinnig, Julia UL

in Taeger, Jürgen (Ed.) Tagungsband Herbstakademie 2019 (in press)

Im Juni 2019 stellte die Organisation für wirtschaftliche Zusammenarbeit und Entwicklung (OECD) das Arbeitsprogramm zur weiteren Ausarbeitung einer Anpassung des internationalen Ertragsteuerrechts an die ... [more ▼]

Im Juni 2019 stellte die Organisation für wirtschaftliche Zusammenarbeit und Entwicklung (OECD) das Arbeitsprogramm zur weiteren Ausarbeitung einer Anpassung des internationalen Ertragsteuerrechts an die neue wirtschaftliche Realität der digitalisierten Welt vor. Auf Ebene der Europäischen Union (EU) gilt die Verabschiedung der im März 2018 von der Europäischen Kommission vorgestellten Richtlinien-Vorschläge (RL-Vorschläge) zu einer Digitalsteuer und einer sog. signifikanten digitalen Präsenz, nach intensiver Diskussion im Rat, als unwahrscheinlich. Der Gerichtshof der Europäischen Union beschäftigt sich derzeit mit der unionsrechtlichen Vereinbarkeit nationaler Sonderabgaben, die umsatzbasiert erhoben werden. Dieser Beitrag bietet einen Überblick über wesentliche Entwicklungen im internationalen und europäischen Steuerrecht bzgl. der Besteuerung digitalisierter Unternehmen. Der Beitrag knüpft an den Vortrag von Prof. Dr. Jens M. Schmittmann und der Verfasserin anlässlich der Herbstakademie 2018 in Bochum, sowie dem Vortrag der Verfasserin anlässlich der Herbstakademie 2017 in Heidelberg an. [less ▲]

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See detailQualitätskonstruktionen - Zur Verarbeitung divergierender Qualitätsanforderungen in der Jugendarbeit
Biewers, Sandra UL

Book published by Beltz Juventa (in press)

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See detailIncorporating trip chaining within online demand estimation
Cantelmo, Guido; Qurashi, Moeid; Prakash, Arun et al

in Transportation Research Procedia (in press)

Time-dependent Origin–Destination (OD) demand flows are fundamental inputs for Dynamic Traffic Assignment (DTA) systems and real-time traffic management. This work introduces a novel state-space framework ... [more ▼]

Time-dependent Origin–Destination (OD) demand flows are fundamental inputs for Dynamic Traffic Assignment (DTA) systems and real-time traffic management. This work introduces a novel state-space framework to estimate these demand flows in an online context. Specifically, we propose to explicitly include trip-chaining behavior within the state-space formulation, which is solved using the well-established Kalman Filtering technique. While existing works already consider structural information and recursive behavior within the online demand estimation problem, this information has been always considered at the OD level. In this study, we introduce this structural information by explicitly representing trip-chaining within the estimation framework. The advantage is twofold. First, all trips belonging to the same tour can be jointly calibrated. Second, given the estimation during a certain time interval, a prediction of the structural deviation over the whole day can be obtained without the need to run additional simulations. The effectiveness of the proposed methodology is demonstrated first on a toy network and then on a large real-world network. Results show that the model improves the prediction performance with respect to a conventional Kalman Filtering approach. We also show that, on the basis of the estimation of the morning commute, the model can be used to predict the evening commute without need of running additional simulations. [less ▲]

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See detailTopologie culinaire au cinéma : le lieu commun du repas et ses déclinaison
Roelens, Nathalie UL

in Bibliothèque électronique Paris 8 (in press)

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See detailLogic, evidence and consensus: Towards a more constructive debate on gaming disorder.
King, Daniel L.; Delfabbro, Paul H.; Potenza, Marc N. et al

in The Australian and New Zealand journal of psychiatry (in press)

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See detailDisrupted Fear and Sadness Recognition in Binge Drinking: A Combined Group and Individual Approach.
Lannoy, Severine; Benzerouk, Farid; Maurage, Pierre et al

in Alcoholism, clinical and experimental research (in press)

BACKGROUND: Binge drinking is a harmful pattern of alcohol consumption, associated with cognitive and cerebral impairments. Indeed, various cognitive processes have been identified as disrupted in binge ... [more ▼]

BACKGROUND: Binge drinking is a harmful pattern of alcohol consumption, associated with cognitive and cerebral impairments. Indeed, various cognitive processes have been identified as disrupted in binge drinking, ranging from perceptive to executive functions, but emotional processes have conversely been little investigated. Particularly, it is unclear to what extent binge drinkers (BD) present difficulties to recognize and categorize the emotions expressed by other individuals. Such an exploration would, however, offer a more comprehensive view of the deficits associated with alcohol-related disorders and potentially involved in the maintenance of this harmful habit. METHODS: Fifty-two BD and 42 control participants performed an emotional task assessing the ability to recognize 6 basic emotions (i.e., anger, contempt, disgust, fear, happiness, and sadness). Accuracy score and detection threshold were collected for each emotion. To explore the extent of emotion recognition difficulties, 2 analyses were conducted: (i) classical repeated measures analyses of variance, to compare groups' performance, and (ii) multiple single-case analyses (i.e., Crawford's t-tests), to determine the percentage of BD presenting genuine emotion recognition deficits. Correlations were also performed between alcohol consumption characteristics and emotional recognition scores. RESULTS: BD presented reduced performance for the recognition of fear and sadness. Multiple single cases highlighted that these deficits respectively concerned 21.15 and 15.38% of the binge drinking sample, and the relation between binge drinking and reduced sadness detection was supported by correlational analyses. CONCLUSIONS: These findings show that binge drinking is associated with a disrupted processing of emotional stimuli. By identifying heterogeneity in the impairments presented by BD, the present results also underline the usefulness of a combined group and individual approach. [less ▲]

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See detailFusing the Seth-Hill strain tensors to fit compressible elastic material responses in the nonlinear regime
Beex, Lars UL

in International Journal of Mechanical Sciences (in press)

Strain energy densities based on the Seth-Hill strain tensors are often used to describe the hyperelastic mechanical behaviours of isotropic, transversely isotropic and orthotropic materials for ... [more ▼]

Strain energy densities based on the Seth-Hill strain tensors are often used to describe the hyperelastic mechanical behaviours of isotropic, transversely isotropic and orthotropic materials for relatively large deformations. Since one parameter distinguishes which strain tensor of the Seth-Hill family is used, one has in theory the possibility to t the material response in the nonlinear regime. Most often for compressible deformations however, this parameter is selected such that the Hencky strain tensor is recovered, because it yields rather physical stress-strain responses. Hence, the response in the nonlinear regime is in practise not often tailored to match experimental data. To ensure that elastic responses in the nonlinear regime can more accurately be controlled, this contribution proposes three generalisations that combine several Seth-Hill strain tensors. The generalisations are formulated such that the stress-strain responses for in finitesimal deformations remain unchanged. Consequently, the identifi cation of the Young's moduli, Poisson's ratios and shear moduli is not a ffected. 3D fi nite element simulations are performed for isotropy and orthotropy, with an emphasis on the identifi cation of the new material parameters. [less ▲]

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See detailSituating difference as a valuable resource in education research
Siry, Christina UL

in Scantlebury, K. (Ed.) Moving science education into the 21st century: A festschrift in honor of Kenneth Tobin (in press)

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See detailA Look into Privacy-Preserving Blockchains
Khan, Nida UL; Nassar, Mohamed

in IEEE BCA @AICCSA 2019 - Workshop on Blockchain and it's Applications (in press)

Blockchain is a revolutionary technology promising a new generation of decentralized, transparent and tamper-proof database systems. However, one of the main challenges of the emerging blockchain systems ... [more ▼]

Blockchain is a revolutionary technology promising a new generation of decentralized, transparent and tamper-proof database systems. However, one of the main challenges of the emerging blockchain systems remains to address data privacy. While in Bitcoin and similar e-cash systems, privacy was limited to anonymity and addressed by using cryptographic pseudonyms for identification and authentication of parties, the question of privacy has more breadth in systems maintaining actual data such as medical records or energy meters. In this paper, we look into recently proposed privacy-preserving blockchains, analyze their strengths and weaknesses, and highlight research questions requiring future investigation. We conclude that privacy-preserving blockchains are still in their infancy and more research is definitely needed in this area. [less ▲]

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See detailFeasibility of Stellar as a Blockchain-based Micropayment System
Khan, Nida UL; Ahmad, Tabrez; State, Radu UL

in Springer SmartBlock 2019 - 2nd International Conference on Smart Blockchain (in press)

The advent of Bitcoin was heralded as an innovation in the global monetary system, that could bring down transaction fees by circumventing the need for third parties and conduct transactions in real time ... [more ▼]

The advent of Bitcoin was heralded as an innovation in the global monetary system, that could bring down transaction fees by circumventing the need for third parties and conduct transactions in real time. The divisibility of a blockchain cryptocurrency to even fractions of a cent, caused microtransactions to become feasible to formerly non-existent denominations. These microtransactions have spurred the development of novel ways of monetizing online resources and hold the potential to aid in alleviation of poverty. The paper conducts a feasibility study on Stellar as a blockchain-based micropayment system. It highlights the computational and other issues that impedes its progress and utilizes a characterization model for micropayment systems to evaluate the efficacy of the Stellar platform. The paper conducts a comparison with the micropayment solutions from Bitcoin, Ethereum and PayPal. The paper analyzes a subset of transactions from the Stellar blockchain to aid in drawing a conclusion on the undertaken study and elaborates on the mitigation tools to enable fraud prevention in online monetary transactions. [less ▲]

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See detailSklaverei war gestern? Menschenhandel im Europa des 21. Jahrhunderts
Veit, Charlotte UL; Nienaber, Birte UL

in Binsfeld, Andrea; Ghetta, Marcello (Eds.) Sklaverei und Identität (in press)

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