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See detailEinleitung
Fickers, Andreas UL; Haude, Rüdiger; Krebs, Stefan UL et al

in Fickers, Andreas; Haude, Rüdiger; Krebs, Stefan (Eds.) et al Jeux sans Frontières? - Grenzgänge der Geschichtswissenschaft (2017)

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See detail"Glanz und Elend der Kunstkopf-Stereophonie": Eine technik- und medienarchäologische Ausgrabung
Krebs, Stefan UL

in Fickers, Andreas; Haude, Rüdiger; Krebs, Stefan (Eds.) et al Jeux sans Frontières? - Grenzgänge der Geschichtswissenschaft (2017)

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See detailFatigue of rocks
Pytlik, Robert Stanislaw UL; Van Baars, Stefan UL

in Johansson, Erik; Raasakka, Ville (Eds.) Proceedings of the 3rd Nordic Rock Mechanics Symposium, NRMS 2017 (2017, November)

Cyclic loading on civil structures can lead to a reduction of strength of the used materials. For the materials concrete and especially steel, there are clear design codes about how to account for the ... [more ▼]

Cyclic loading on civil structures can lead to a reduction of strength of the used materials. For the materials concrete and especially steel, there are clear design codes about how to account for the reduction of the material shear strength due to this cyclic loading, which is called fatigue. For the material rock, however, there are no design codes or standards for fatigue, in terms of shear strength reduction. For this reason, a large number of laboratory triaxial tests have been performed, in order to evaluate the fatigue of rocks by comparing the shear strength parameters obtained in cyclic triaxial tests with the static shear strength. Tests have been performed on artificial gypsum, a mixture of sand and cement (mortar) and soft sedimentary limestone. Correlations of the fatigue, for both the number of cycles and the cyclic stress ratio, have been obtained. All triaxial tests were conducted on dry samples (no pore pressure) in the natural state. The range of the confining pressure was between 0 MPa and 0.5 MPa. The frequency was kept low to allow for a precise application of the cyclic load and also accurate readings. The number of applied cycles was from a few cycles up to a few hundred thousand. The imperfections in the artificial gypsum have a significant impact on the results of the (especially cyclic) strength tests. Therefore another man made material was used – a mixture of sand and cement (mortar). As the first static test results were very promising, mortar was used in further tests. The cyclic tests, however, presented a similar, high scatter of results as for artificial gypsum. Due to the complex behaviour of the cohesive materials and high scatter of the results, many tests were required. Two different strategies were used to investigate the fatigue of the cohesive geomaterials: 1. the remaining shear strength curve: after a given number of cycles, a final single load test until failure, measures the remaining shear strength of the sample. 2. the typical S-N curve (Wöhler curves): one counts the number of constant loading cycles until failure. The fatigue of rocks can be seen as a reduction of the cohesion. In this way, the fatigue of a cohesive geomaterial can be described by (a reduction of) the remaining cohesion. An unexpected observation for both artificial gypsum and mortar was that unlike the number of cycles, the size of the cyclic stress ratio has little influence on the remaining shear strength, and therefore on fatigue. The remaining shear strength (or strength reduction) curve has been compared with the standard S-N curve, and is found to be rather similar for both artificial gypsum and mortar. The reason for this is this unexpected observation. Because of this, the S-N curve and the remaining shear strength curve should be theoretically identical. The results of the triaxial tests show however that, the S-N curve gives a bit steeper slope than the remaining shear strength curve, which would imply a shorter life and a faster reduction in comparison to the remaining shear strength curve, but this is only because, the prematurely failed samples are not included in the remaining shear strength curve, while a significant number of the S-N samples are prematurely failed samples from the remaining shear strength tests. [less ▲]

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See detailJeux sans Frontières? - Grenzgänge der Geschichtswissenschaft
Fickers, Andreas UL; Haude, Rüdiger; Krebs, Stefan UL et al

Book published by transcript (2017)

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See detailDNA partitions into triplets under tension in the presence of organic cations, with sequence evolutionary age predicting the stability of the triplet phase
Taghavi, Amirhossein UL; van der Schoot, Paul; Berryman, Josh UL

in Quarterly Reviews of Biophysics (2017), 50

Using atomistic simulations, we show the formation of stable triplet structure when particular GC-rich DNA duplexes are extended in solution over a timescale of hundreds of nanoseconds, in the presence of ... [more ▼]

Using atomistic simulations, we show the formation of stable triplet structure when particular GC-rich DNA duplexes are extended in solution over a timescale of hundreds of nanoseconds, in the presence of organic salt. We present planar-stacked triplet disproportionated DNA (Σ DNA) as a possible solution phase of the double helix under tension, subject to sequence and the presence of stabilising co-factors. Considering the partitioning of the duplexes into triplets of base pairs as the first step of operation of recombinase enzymes like RecA, we emphasise the structure–function relationship in Σ DNA. We supplement atomistic calculations with thermodynamic arguments to show that codons for ‘phase 1’ amino acids (those appearing early in evolution) are more likely than a lower entropy GC-rich sequence to form triplets under tension. We further observe that the four amino acids supposed (in the ‘GADV world’ hypothesis) to constitute the minimal set to produce functional globular proteins have the strongest triplet-forming propensity within the phase 1 set, showing a series of decreasing triplet propensity with evolutionary newness. The weak form of our observation provides a physical mechanism to minimise read frame and recombination alignment errors in the early evolution of the genetic code. [less ▲]

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See detailOpbauen op méisproocheg Ressourcen beim Sproocheléieren
Kirsch, Claudine UL

in Learn (2017), November(06),

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See detailAnalysis of Fingerprinting Techniques for Tor Hidden Services
Panchenko, Andriy UL; Mitseva, Asya UL; Henze, Martin et al

in Proceedings of the 24th ACM Computer and Communications Security (ACM CCS) 16th Workshop on Privacy in the Electronic Society (ACM WPES 2017) (2017, October 31)

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See detailAdvanced Interest Flooding Attacks in Named-Data Networking
Signorello, Salvatore UL; Marchal, Samuel; François, Jérôme et al

Scientific Conference (2017, October 30)

The Named-Data Networking (NDN) has emerged as a clean-slate Internet proposal on the wave of Information-Centric Networking. Although the NDN’s data-plane seems to offer many advantages, e.g., native ... [more ▼]

The Named-Data Networking (NDN) has emerged as a clean-slate Internet proposal on the wave of Information-Centric Networking. Although the NDN’s data-plane seems to offer many advantages, e.g., native support for multicast communications and flow balance, it also makes the network infrastructure vulnerable to a specific DDoS attack, the Interest Flooding Attack (IFA). In IFAs, a botnet issuing unsatisfiable content requests can be set up effortlessly to exhaust routers’ resources and cause a severe performance drop to legitimate users. So far several countermeasures have addressed this security threat, however, their efficacy was proved by means of simplistic assumptions on the attack model. Therefore, we propose a more complete attack model and design an advanced IFA. We show the efficiency of our novel attack scheme by extensively assessing some of the state-of-the-art countermeasures. Further, we release the software to perform this attack as open source tool to help design future more robust defense mechanisms. [less ▲]

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See detailSklaverei zur Zeit Diokletians und Konstantins
Binsfeld, Andrea UL

Presentation (2017, October 28)

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See detailDe la révolution à la fin des utopies
Scuto, Denis UL

Article for general public (2017)

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See detailEidgenössische Jugendbefragungen ch-x: Lebensstile, Konsum und Zukunftsperspektiven junger Erwachsener in der Schweiz
Samuel, Robin UL

Speeches/Talks (2017)

Welches sind die aktuellen Wert-, Lebens- und Zukunftsvorstellungen von jungen Erwachsenen in der Schweiz? Welche Rolle nehmen die neuen Medien im Leben der ersten Generation der Digital Natives ein? Was ... [more ▼]

Welches sind die aktuellen Wert-, Lebens- und Zukunftsvorstellungen von jungen Erwachsenen in der Schweiz? Welche Rolle nehmen die neuen Medien im Leben der ersten Generation der Digital Natives ein? Was sind die Erwartungen der jungen Erwachsenen an Familie, Beruf, Religion und Freizeit? Eine neue Studie der Eidgenössischen Jugendbefragungen ch-x geht diesen Fragen nach. Sie stellt u.a. eine erstaunliche Trendstabilität bei den Grundwerten und bei der Einstufung der Wichtigkeit verschiedener Lebensbereiche fest. [less ▲]

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See detailBildung in Not!
Steffgen, Georges UL

Article for general public (2017)

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See detailGuérilla UX, "quick" mais pas "dirty"
Lallemand, Carine UL

Conference given outside the academic context (2017)

Les ressources limitées des projets de conception incitent souvent à appliquer des méthodes UX rapides, low-cost, « quick & dirty ». Mais le « guerilla UX » peut aussi être « quick » sans être « dirty » ... [more ▼]

Les ressources limitées des projets de conception incitent souvent à appliquer des méthodes UX rapides, low-cost, « quick & dirty ». Mais le « guerilla UX » peut aussi être « quick » sans être « dirty », être inspirant, et constituer une alternative valide aux méthodes traditionnelles de design UX. Au-delà des célèbres tests utilisateurs à la mode Starbucks, cette conférence vous présentera de nombreuses alternatives guérilla aux entretiens, questionnaires, observations, en passant aussi par l’idéation, le storyboarding ou le maquettage. Une bonne dose d’inspiration pour se donner les moyens de faire de l’UX quand on n’en a pas les moyens ! [less ▲]

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See detailOn quasitrivial and associative operations
Devillet, Jimmy UL; Couceiro, Miguel; Marichal, Jean-Luc UL

Presentation (2017, October 25)

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See detailLimites juridiques de la traduction – Limites de la traduction juridique
Becker, Katrin UL

Presentation (2017, October 24)

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See detailEthereum: state of knowledge and research perspectives
Tikhomirov, Sergei UL

Scientific Conference (2017, October 24)

Ethereum is a decentralized application platform that allows users to write, deploy, and interact with smart contracts -- programs that encode financial agreements. A peer-to-peer network of mutually ... [more ▼]

Ethereum is a decentralized application platform that allows users to write, deploy, and interact with smart contracts -- programs that encode financial agreements. A peer-to-peer network of mutually distrusting nodes maintains a common view of the state of all accounts and executes smart contracts' code upon request. The global state is stored in a blockchain secured by a proof-of-work consensus mechanism similar to that in Bitcoin. The core value proposition of Ethereum is a Turing-complete programming language that enables implementing complex logic in smart contracts. Decentralized applications without a trusted third party are appealing in many areas, such as financial services, crowdfunding, and gambling. Smart contracts as a research topic contains many unsolved challenges and spans over areas ranging from cryptography, consensus algorithms, and programming languages to governance, ethical, and legal issues. This paper is the first to summarize the state of knowledge in this field. We provide a technical overview of Ethereum and outline open challenges along with proposed solutions. We also mention alternative blockchains with Turing complete programming capabilities. [less ▲]

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See detailVariant-DB: A Tool for Efficiently Exploring Millions of Human Genetic Variants and Their Annotations
Kutzera, Joachim UL; May, Patrick UL

in Da Silveira, Marcos; Pruski, Cédric; Schneider, Reinhard (Eds.) DILS 2017: Data Integration in the Life Sciences (2017, October 24)

Next Generation Sequencing (NGS) allows sequencing of a human genome within hours, enabling large scale applications such as sequencing the genome of each patient in a clinical study. Each individual ... [more ▼]

Next Generation Sequencing (NGS) allows sequencing of a human genome within hours, enabling large scale applications such as sequencing the genome of each patient in a clinical study. Each individual human genome has about 3.5 Million genetic differences to the so called reference genome, the consensus genome of a healthy human. These differences, called variants, determine individual phenotypes, and certain variants are known to indicate disease predispositions. Finding associations from variant patterns and affected genes to these diseases requires combined analysis of variants from multiple individuals and hence, efficient solutions for accessing and filtering the variant data. We present Variant-DB, our in-house database solution that allows such efficient access to millions of variants from hundreds to thousands of individuals. Variant-DB stores individual variant genotypes and annotations. It features a REST-API and a web-based front-end for filtering variants based on annotations, individuals, families and studies. We explain Variant-DB and its front-end and demonstrate how the Variant-DB API can be included in data integration workflows. [less ▲]

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See detailSpatially Differentiated, Temporally Variegated: The Study of Life Cycles for a Better Understanding of Suburbia in German City Regions
Hesse, Markus UL; Polivka, Jan; Reicher, Christa

in Raumforschung und Raumordnung (2017)

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See detailSprachenlernen mit der App iTEO
Kirsch, Claudine UL

Presentation (2017, October 24)

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