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See detailHigh‐performance low bandgap thin film solar cells for tandem applications
Elanzeery, Hossam UL; Babbe, Finn UL; Melchiorre, Michele UL et al

in Progress in Photovoltaics (2018)

Thin film tandem solar cells provide a promising approach to achieve high efficiencies. These tandem cells require at least a bottom low bandgap and an upper high bandgap solar cell. In this contribution ... [more ▼]

Thin film tandem solar cells provide a promising approach to achieve high efficiencies. These tandem cells require at least a bottom low bandgap and an upper high bandgap solar cell. In this contribution, 2 high‐performance Cu(In,Ga)Se2 cells with bandgaps as low as 1.04 and 1.07 eV are presented. These cells have shown certified efficiencies of 15.7% and 16.6% respectively. Measuring these cells under a 780‐nm longpass filter, corresponding to the bandgap of a typical top cell in tandem applications (1.57 eV), they achieved efficiencies of 7.9% and 8.3%. Admittance measurements showed no recombination active deep defects. One additional high‐performance CuInSe2 thin film solar cell with bandgap of 0.95 eV and efficiency of 14.1% is presented. All 3 cells have the potential to be integrated as bottom low bandgap cells in thin film tandem applications achieving efficiencies around 24% stacked with an efficient high bandgap top cell. [less ▲]

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See detailROADNET: Fairness- and Throughput-Enhanced Scheduling for Content Dissemination in VANETs
Di Maio, Antonio UL; Soua, Ridha UL; Palattella, Maria Rita UL et al

in ROADNET: Fairness- and Throughput-Enhanced Scheduling for Content Dissemination in VANETs (2018, May 23)

The increasing demand for bandwidth by applications in Vehicular Ad-Hoc Networks (VANETs), combined with the increasing number of their users, stresses the importance of data dissemination schemes that ... [more ▼]

The increasing demand for bandwidth by applications in Vehicular Ad-Hoc Networks (VANETs), combined with the increasing number of their users, stresses the importance of data dissemination schemes that strike a balance between network throughput and user fairness. Ensuring this balance is challenging in vehicular networks, which are characterized by a high dynamism of the network topology, volatility of intervehicular links, and heterogeneity of the exchanged content. For these reasons, we hereby introduce ROADNET, a cooperative content dissemination scheme for VANETs. Leveraging on the Software Defined Networking (SDN) paradigm, ROADNET provides a trade-off between network throughput and user fairness by exploiting the logical centralized control of SDN and the multichannel operation of the IEEE 1609.4 standard. Realistic simulation results show that our scheme outperforms prior works in terms of both throughput (≈ 36%) and fairness (≈ 6%), providing high channel load balance (σ ≈ 1%). [less ▲]

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See detailA risk-based approach towards infringement prevention on the internet
Ullrich, Carsten UL

Presentation (2018, April 25)

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See detailPreventing Infringements on E-Commerce Marketplaces: proposal of a risk-based approach towards intermediary liablity
Ullrich, Carsten UL

Conference given outside the academic context (2018)

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See detailStructural properties of steel-concrete composite joints
Duarte da Costa, Job UL

Doctoral thesis (2018)

The performance of steel and concrete composite frames is influenced by the structural properties of beam-to-column composite joints. The accurate assessment of these properties constitutes therefore an ... [more ▼]

The performance of steel and concrete composite frames is influenced by the structural properties of beam-to-column composite joints. The accurate assessment of these properties constitutes therefore an important element for a realistic representation of the structural behaviour at serviceability and ultimate limit state. However, the structural joint properties are not equally covered by current design standards; analytical guidance is provided to assess the resistance and stiffness of composite joints, whereas for the rotation capacity an experimental proof is required. Due to the additional effort required to determine the rotation capacity, the global plastic analysis finds little application in the design of composite frames, resulting in a lack of efficiency and material optimization in the final design. In the present work, an analytical model to calculate the rotation capacity of composite joints is derived. Based on the knowledge developed in this research, an improvement of the current design rules for the joint stiffness is proposed. This model is based on an experimental test campaign comprising eight full-scale beamto- column joints with composite slim-floor beams. Besides, a finite element model was developed with the software Abaqus, which has been validated by the experimental tests. Numerical simulations were performed to investigate in-depth the conducted experiments and to analyse the behaviour of additional composite joints with different reinforcement properties. This research has resulted in new analytical design rules for the joint stiffness and rotation capacity. The reliability of these new design rules has been demonstrated for different joint typologies using experimental and numerical data. The development of an analytical method for the rotation capacity of composite joints allows composite beams with composite beam-to-column joints to be designed according to the global plastic analysis without need of experimental evidence. Furthermore, the improvement of the current design rules for the stiffness of composite joints induces a more accurate assessment of the action effects at serviceability and ultimate limit state. This thesis provides therefore a complete methodology to design beam-to-column composite joints. [less ▲]

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See detailIuwers zornes unmâze missevellet uns sêre. Legitimität von Maßlosigkeit im mittelalterlichen Erzählkosmos
Bendheim, Amelie UL

in Das Mittelalter (2018), 23(1), 11-28

Ausgehend von den Defiziten bestehender Ansätze zur Beschreibung des Helden in mittelalterlichen Erzählwelten, soll die Maßlosigkeit (unmâze) als neue literaturgeschichtliche Kategorie funktionalisiert ... [more ▼]

Ausgehend von den Defiziten bestehender Ansätze zur Beschreibung des Helden in mittelalterlichen Erzählwelten, soll die Maßlosigkeit (unmâze) als neue literaturgeschichtliche Kategorie funktionalisiert werden. Entgegen der konzeptuellen, binären Typisierung des Protagonisten als ‚Held’ bzw. ‚Ritter’ bildet sie ein flexibles Modell, das relational operiert und damit erlaubt, graduelle Unterscheidungen zwischen den Texten vorzunehmen. Am Beispiel heldenepischen (‚Nibelungenlied’) und romanhaften (‚Flore und Blanscheflur’, ‚Wigalois’) Erzählens im Mittelalter wird gezeigt, wie mit dem maßlosen Helden narrativ umgegangen wird. Dabei liegt der Fokus insbesondere auf der unterschiedlichen Bewertung seines Handelns: Kann sich der Held im Epos über soziale Normen und geltende Gesetze hinwegsetzen (Siegfried bei der Brautwerbung, Hagen mit dem Mord an Siegfried) ohne dafür bestraft zu werden, tritt die Maßlosigkeit im höfischen Roman stärker in den Bereich der Ratio: Sie wird dabei zum einen begrenzt und ‚bemessen’, zum anderen wird maßloses Handeln nun strikt sanktioniert und unterbunden. Unter Bezugnahme auf aktuelle Ausprägungen der Maßlosigkeit im gesellschaftspolitischen Kontext, tritt das Konzept der Maßlosigkeit als unverändert produktives Muster hervor. Seine gesellschaftliche Relevanz regt zu einer epochenübergreifenden literaturgeschichtlichen Inanspruchnahme an, die sich zum Ziel setzt, die Literaturgeschichte als Geschichte der Maßlosigkeit zu neu zu begreifen. [less ▲]

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See detailReconstructing science education within the language I science relationship
Wilmes, Sara UL; Siry, Christina UL; Gomez-Fernandez, Roberto UL et al

in Tobin, Kenneth; Bryan, Lynn (Eds.) 13 Questions: Reframing Education's Conversation: Science (2018)

Our research is embedded in the multilingual national context of Luxembourg, a small diverse country in Western Europe, and as such our research participants are culturally and linguistically diverse (CLD ... [more ▼]

Our research is embedded in the multilingual national context of Luxembourg, a small diverse country in Western Europe, and as such our research participants are culturally and linguistically diverse (CLD). Luxembourg’s public schools reflect the diversity of the country, with 44% of students identifying as a nationality other than Luxembourgish, and 55% speaking a first language other than Luxembourgish (Ministère de l’éducation nationale, de l’Enfance et de la Jeunesse [MENJE], 2015). Certainly, students draw on a wide variety of resources as they make meaning in science, and a key resource in this process of meaning making is language, which serves to mediate learning as well as position participants in the learning process. However, for students with proficiencies in languages other than the ones used for instruction in schools (such as the students we work with), the nuances of how language(s) can serve as resource(s) for learning are crucial for researchers and teachers to consider and understand. Science, language, and learning are interwoven, connected, and we believe, inseparable, to the processes of science education. In this chapter we use a critical lens to deconstruct the use of language(s) in science education as we address the overarching question posted by the title of this section, “In what ways does language affect (and is affected by) the science educational process?” Throughout this process of deconstruction, we address several critical questions that arise from our research and lived experiences connected to Reconstructing Science Education within the Language | Science Relationship Reflections from Multilingual Contexts sara e. d. wilmes, christina siry, roberto gómez fernández, and anna maria gorges c h a p t e r n i n e t e e n 254 | sara e. d. wilmes et al. the relationship between science education and language. Specifically, we address the following interrelated questions: • Who decides which languages are used in classrooms? • How can we create classroom spaces that value diverse student resources? • What is the relationship between language used in science education, power, and agency? [less ▲]

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See detailUnderstanding the Babylonian tablet ‘Plimpton 322’ with the decimal system
Perucca, Antonella UL; Stranen, Deborah

E-print/Working paper (2018)

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See detailSuburban Planet
Hesse, Markus UL

in Local Environment (2018)

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See detailAlloyInEcore: Embedding of First-Order Relational Logic into Meta-Object Facility for Automated Model Reasoning
Erata, Ferhat; Göknil, Arda UL; Kurtev, Ivan et al

in 26th ACM Joint European Software Engineering Conference and Symposium on the Foundations of Software Engineering (ESEC/FSE 2018) (2018)

We present AlloyInEcore, a tool for specifying metamodels with their static semantics to facilitate automated, formal reasoning on models. Software development projects require that software systems be ... [more ▼]

We present AlloyInEcore, a tool for specifying metamodels with their static semantics to facilitate automated, formal reasoning on models. Software development projects require that software systems be specified in various models (e.g., requirements models, architecture models, test models, and source code). It is crucial to reason about those models to ensure the correct and complete system specifications. AlloyInEcore allows the user to specify metamodels with their static semantics, while, using the semantics, it automatically detects inconsistent models, and completes partial models. It has been evaluated on three industrial case studies in the automotive domain (https://modelwriter.github.io/AlloyInEcore/). [less ▲]

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See detailMaskAl: Privacy Preserving Masked Reads Alignment using Intel SGX
Lambert, Christoph UL; Fernandes, Maria UL; Decouchant, Jérémie UL et al

Scientific Conference (2018)

The recent introduction of new DNA sequencing techniques caused the amount of processed and stored biological data to skyrocket. In order to process these vast amounts of data, bio-centers have been ... [more ▼]

The recent introduction of new DNA sequencing techniques caused the amount of processed and stored biological data to skyrocket. In order to process these vast amounts of data, bio-centers have been tempted to use low-cost public clouds. However, genomes are privacy sensitive, since they store personal information about their donors, such as their identity, disease risks, heredity and ethnic origin. The first critical DNA processing step that can be executed in a cloud, i.e., read alignment, consists in finding the location of the DNA sequences produced by a sequencing machine in the human genome. While recent developments aim at increasing performance, only few approaches address the need for fast and privacy preserving read alignment methods. This paper introduces MaskAl, a novel approach for read alignment. MaskAl combines a fast preprocessing step on raw genomic data — filtering and masking — with established algorithms to align sanitized reads, from which sensitive parts have been masked out, and refines the alignment score using the masked out information with Intel’s software guard extensions (SGX). MaskAl is a highly competitive privacy-preserving read alignment software that can be massively parallelized with public clouds and emerging enclave clouds. Finally, MaskAl is nearly as accurate as plain-text approaches (more than 96% of aligned reads with MaskAl compared to 98% with BWA) and can process alignment workloads 87% faster than current privacy-preserving approaches while using less memory and network bandwidth. [less ▲]

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See detailCommunity-driven roadmap for integrated disease maps.
Ostaszewski, Marek UL; Gebel, Stephan UL; Kuperstein, Inna et al

in Briefings in bioinformatics (2018)

The Disease Maps Project builds on a network of scientific and clinical groups that exchange best practices, share information and develop systems biomedicine tools. The project aims for an integrated ... [more ▼]

The Disease Maps Project builds on a network of scientific and clinical groups that exchange best practices, share information and develop systems biomedicine tools. The project aims for an integrated, highly curated and user-friendly platform for disease-related knowledge. The primary focus of disease maps is on interconnected signaling, metabolic and gene regulatory network pathways represented in standard formats. The involvement of domain experts ensures that the key disease hallmarks are covered and relevant, up-to-date knowledge is adequately represented. Expert-curated and computer readable, disease maps may serve as a compendium of knowledge, allow for data-supported hypothesis generation or serve as a scaffold for the generation of predictive mathematical models. This article summarizes the 2nd Disease Maps Community meeting, highlighting its important topics and outcomes. We outline milestones on the roadmap for the future development of disease maps, including creating and maintaining standardized disease maps; sharing parts of maps that encode common human disease mechanisms; providing technical solutions for complexity management of maps; and Web tools for in-depth exploration of such maps. A dedicated discussion was focused on mathematical modeling approaches, as one of the main goals of disease map development is the generation of mathematically interpretable representations to predict disease comorbidity or drug response and to suggest drug repositioning, altogether supporting clinical decisions. [less ▲]

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See detailA roadmap towards personalized immunology.
Delhalle, Sylvie; Bode, Sebastian F. N.; Balling, Rudi UL et al

in NPJ systems biology and applications (2018), 4

Big data generation and computational processing will enable medicine to evolve from a "one-size-fits-all" approach to precise patient stratification and treatment. Significant achievements using "Omics ... [more ▼]

Big data generation and computational processing will enable medicine to evolve from a "one-size-fits-all" approach to precise patient stratification and treatment. Significant achievements using "Omics" data have been made especially in personalized oncology. However, immune cells relative to tumor cells show a much higher degree of complexity in heterogeneity, dynamics, memory-capability, plasticity and "social" interactions. There is still a long way ahead on translating our capability to identify potentially targetable personalized biomarkers into effective personalized therapy in immune-centralized diseases. Here, we discuss the recent advances and successful applications in "Omics" data utilization and network analysis on patients' samples of clinical trials and studies, as well as the major challenges and strategies towards personalized stratification and treatment for infectious or non-communicable inflammatory diseases such as autoimmune diseases or allergies. We provide a roadmap and highlight experimental, clinical, computational analysis, data management, ethical and regulatory issues to accelerate the implementation of personalized immunology. [less ▲]

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See detailSystems medicine disease maps: community-driven comprehensive representation of disease mechanisms.
Mazein, Alexander; Ostaszewski, Marek UL; Kuperstein, Inna et al

in NPJ systems biology and applications (2018), 4

The development of computational approaches in systems biology has reached a state of maturity that allows their transition to systems medicine. Despite this progress, intuitive visualisation and context ... [more ▼]

The development of computational approaches in systems biology has reached a state of maturity that allows their transition to systems medicine. Despite this progress, intuitive visualisation and context-dependent knowledge representation still present a major bottleneck. In this paper, we describe the Disease Maps Project, an effort towards a community-driven computationally readable comprehensive representation of disease mechanisms. We outline the key principles and the framework required for the success of this initiative, including use of best practices, standards and protocols. We apply a modular approach to ensure efficient sharing and reuse of resources for projects dedicated to specific diseases. Community-wide use of disease maps will accelerate the conduct of biomedical research and lead to new disease ontologies defined from mechanism-based disease endotypes rather than phenotypes. [less ▲]

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