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Peer Reviewed
See detailPartis politiques et religions en Europe 2016-2017
Poirier, Philippe UL

in Reynié, Dominique (Ed.) L'opinion européenne en 2017 (2017)

Pour la dix-huitième année, les auteurs de « L opinion européenne » traquent l émergence d une conscience et d une culture propre à tous ceux qui, de l Atlantique à l Oural, de Gibraltar à Trondheim, font ... [more ▼]

Pour la dix-huitième année, les auteurs de « L opinion européenne » traquent l émergence d une conscience et d une culture propre à tous ceux qui, de l Atlantique à l Oural, de Gibraltar à Trondheim, font l âme du Vieux Continent ! Un ouvrage de référence, attendu chaque année par tous les observateurs de l Europe en marche ! [less ▲]

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See detailPhonetik, Phonologie und Schrift
Dahmen, Silvia; Weth, Constanze UL

Book published by Ferdinand Schöningh (2017)

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See detailBausteng Grammatik - Bausteine Grammatik - Briques de Grammaire
Weth, Constanze UL

Book published by SCRIPT (2017)

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See detailOptimising Packet Forwarding in Multi-Tenant Networks using Rule Compilation
Hommes, Stefan UL; Valtchev, Petko; Blaiech, Khalil et al

in Optimising Packet Forwarding in Multi-Tenant Networks using Rule Compilation (2017, November)

Packet forwarding in Software-Defined Networks (SDN) relies on a centralised network controller which enforces network policies expressed as forwarding rules. Rules are deployed as sets of entries into ... [more ▼]

Packet forwarding in Software-Defined Networks (SDN) relies on a centralised network controller which enforces network policies expressed as forwarding rules. Rules are deployed as sets of entries into network device tables. With heterogeneous devices, deployment is strongly bounded by the respective table constraints (size, lookup time, etc.) and forwarding pipelines. Hence, minimising the overall number of entries is paramount in reducing resource consumption and speeding up the search. Moreover, since multiple control plane applications can deploy own rules, conflicts may occur. To avoid those and ensure overall correctness, a rule validation mechanism is required. Here, we present a compilation mechanism for rules of diverging origins that minimises the number of entries. Since it exploits the semantics of rules and entries, our compiler fits a heterogeneous landscape of network devices. We evaluated compiler implementations on both software and hardware switches using a realistic testbed. Experimental results show a reduction in both produced table entries and forwarding delay. [less ▲]

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See detailYour Moves, Your Device: Establishing Behavior Profiles Using Tensors
Falk, Eric UL; Charlier, Jérémy Henri J. UL; State, Radu UL

in Advanced Data Mining and Applications - 13th International Conference, ADMA 2017 (2017, November)

Smartphones became a person's constant companion. As the strictly personal devices they are, they gradually enable the replacement of well established activities as for instance payments, two factor ... [more ▼]

Smartphones became a person's constant companion. As the strictly personal devices they are, they gradually enable the replacement of well established activities as for instance payments, two factor authentication or personal assistants. In addition, Internet of Things (IoT) gadgets extend the capabilities of the latter even further. Devices such as body worn fitness trackers allow users to keep track of daily activities by periodically synchronizing data with the smartphone and ultimately with the vendor's computational centers in the cloud. These fitness trackers are equipped with an array of sensors to measure the movements of the device, to derive information as step counts or make assessments about sleep quality. We capture the raw sensor data from wrist-worn activity trackers to model a biometric behavior profile of the carrier. We establish and present techniques to determine rather the original person, who trained the model, is currently wearing the bracelet or another individual. Our contribution is based on CANDECOMP/PARAFAC (CP) tensor decomposition so that computational complexity facilitates: the execution on light computational devices on low precision settings, or the migration to stronger CPUs or to the cloud, for high to very high granularity. This precision parameter allows the security layer to be adaptable, in order to be compliant with the requirements set by the use cases. We show that our approach identifies users with high confidence. [less ▲]

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See detailBuchbesprechung von: Karsten Igel, Thomas Lau (dir.), Die Stadt im Raum. Vorstellungen, Entwürfe und Gestaltungen im vormodernen Europa
Pauly, Michel UL

in Revue de l’Institut français d’histoire en Allemagne (2017), http://ifha.revues.org/8811

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See detailCEN/TC250/SC4.T1: Second Generation of Eurocode 4: Introduction and Amendments to Final Draft October 2017
Banfi, Mike; Mensinger, Martin; Schäfer, Markus UL et al

Report (2017)

Development of second Generation of Eurocode 4, Projectteam CEN/TC250/SC4/T1, Reports for final Draft October 2017

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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 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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