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See detailGalois Families of Modular Forms
Wiese, Gabor UL

Presentation (2021, April 16)

Following a joint work with Sara Arias-de-Reyna and François Legrand, we present a new kind of families of modular forms. They come from representations of the absolute Galois group of rational function ... [more ▼]

Following a joint work with Sara Arias-de-Reyna and François Legrand, we present a new kind of families of modular forms. They come from representations of the absolute Galois group of rational function fields over Q. As a motivation and illustration, we discuss in some details one example: an infinite Galois family of Katz modular forms of weight one in characteristic 7, all members of which are non-liftable. This may be surprising because non-liftability is a feature that one might expect to occur only occasionally. [less ▲]

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See detailTrauerdefinition, Geschlechterunterschiede sowie religiöse und kulturelle Unterschiede im Umgang mit Tod und Trauer
Skrozic, Amna UL; Kijamet, Dzenita UL

in Böhmer, Matthias; Steffgen, Georges (Eds.) Trauer an Schulen. Basiswissen und Hinweise zum Umgang mit Sterben und Tod (2021)

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See detailCheminformatics and the Exposome in Health and Disease
Schymanski, Emma UL; Aurich, Dagny UL

Scientific Conference (2021, April 10)

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See detailAdaptive Waveform Design for Automotive Joint Radar-Communication Systems
Dokhanchi, Sayed Hossein; Mysore Rama Rao, Bhavani Shankar UL; Alaeekerahroodi, Mohammad UL et al

in IEEE Transactions on Vehicular Technology (2021), 70(5), 4273-4290

Unified waveform design for automotive joint radar-communications (JRC) leverages the scarce spectrum efficiently and has become a key topic for investigation of late. Designing such a waveform ... [more ▼]

Unified waveform design for automotive joint radar-communications (JRC) leverages the scarce spectrum efficiently and has become a key topic for investigation of late. Designing such a waveform necessitates meeting the requirements of both systems, thereby making it a challenging task. The contribution of this paper is to formulate the JRC design problem into an optimization problem and propose an algorithm to maximize the signal-to-clutter-plus-noise-ratio (SCNR) of radar system and signal-to-noise-ratio (SNR) at communicating vehicle, simultaneously. Central to this are the exploitation of the communication link to acquire environment/ channel information and enhance radar tasks, flexibility to impart trade-off between the two systems during design as well the formulation of the optimization problem to include sidelobe constraints and yield solutions robust to Doppler shifts. The designed waveforms exhibit enhanced radar performance in terms of probability of detection and communication performance in terms of bit error rate (BER), while taking into account the trade-off between two systems. The numerical simulations corroborate the claim of optimized performance with environment/ channel information, ease of effecting trade-off and the use of design flexibility. [less ▲]

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See detailNF-κB and TNF Affect the Astrocytic Differentiation from Neural Stem Cells
Grandbarbe, Luc UL; Michelucci, Alessandro UL; Heuschling, Paul UL et al

in Cells (2021)

The NF-κB signaling pathway is crucial during development and inflammatory processes. We have previously shown that NF-κB activation induces dedifferentiation of astrocytes into neural progenitor cells ... [more ▼]

The NF-κB signaling pathway is crucial during development and inflammatory processes. We have previously shown that NF-κB activation induces dedifferentiation of astrocytes into neural progenitor cells (NPCs). Here, we provide evidence  that the NF-κB pathway plays also a fundamental role during the differentiation of NPCs into astrocytes. First, we show that the NF-κB pathway is essential to initiate astrocytic differentiation as its early inhibition induces NPC apoptosis and impedes their differentiation. Second, we demonstrate that persistent NF-κB activation affects NPC-derived astrocyte differentiation. Tumor necrosis factor (TNF)-treated NPCs show NF-κB activation, maintain their multipotential and proliferation properties, display persistent expression of immature markers and inhibit astrocyte markers. Third, we analyze the effect of  NF-κB activation on the main known astrocytic differentiation pathways, such as NOTCH and JAK-STAT. Our findings suggest that the NF-κB pathway plays a dual fundamental role during NPC differentiation into astrocytes: it promotes astrocyte specification, but its persistent activation impedes their differentiation. [less ▲]

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See detailD'ÉROS À AGAPÉ : LE CANTIQUE DES CANTIQUES, PHÈDRE DE JEAN RACINE ET PARTAGE DE MIDI DE PAUL CLAUDEL
Deregnoncourt, Marine UL

in Théâtres du Monde (2021), 31(2021), 175-187

Cet article s’intéresse à trois œuvres qu’à priori tout oppose : Le Cantique des Cantiques, Phèdre de Jean Racine et Partage de midi de Paul Claudel. À l’instar des protagonistes du Cantique des Cantiques ... [more ▼]

Cet article s’intéresse à trois œuvres qu’à priori tout oppose : Le Cantique des Cantiques, Phèdre de Jean Racine et Partage de midi de Paul Claudel. À l’instar des protagonistes du Cantique des Cantiques, Hippolyte et Aricie (Phèdre de Jean Racine) et Mesa et Ysé (Partage de midi de Paul Claudel) sont des êtres qui vivent un amour initiatique. Ils n’ont de cesse de se fuir et de se (re) chercher. C’est la nostalgie d’Éros et d’Agapé. En tant que drame du désir, de l’amour et de l’altérité intrinsèque à l’humanité et en tant que texte biblique axé sur l’amour et la prière, Le Cantique des Cantiques fait l’objet de nombreuses relectures et de commentaires divers et variés. La problématique à laquelle se consacre cet article est : « comment et pourquoi pouvons-nous considérer Hippolyte et Aricie dans Phèdre de Jean Racine et Mesa et Ysé dans Partage de midi de Paul Claudel comme étant des figures archétypales modernes du Cantique des Cantiques ? ». Pour tenter de répondre à cette problématique, cinq critères vont nous guider tout au long de notre étude : le lyrisme formel, un espace ouvert et fermé, la présence et l’absence, la féminité et le sacré. [less ▲]

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See detailPhèdre de Jean Racine et Partage de midi de Paul Claudel : Un théâtre poétique, entre présence et absence (entre voix parlée et silence musical)
Deregnoncourt, Marine UL

in Théâtres du Monde (2021), 31(2021), 187-197

La problématique de cet article, divisé en trois parties, peut se formuler comme suit : « Comment, entre présence et absence, la voix parlée alterne-t-elle avec le silence musical dans Phèdre de Jean ... [more ▼]

La problématique de cet article, divisé en trois parties, peut se formuler comme suit : « Comment, entre présence et absence, la voix parlée alterne-t-elle avec le silence musical dans Phèdre de Jean Racine et Partage de midi de Paul Claudel ? ». La première partie de cette étude constitue un versant théorique. Nous tenterons de cerner ce qu’il faut précisément entendre par « théâtre poétique ». Nous nous axerons ensuite plus particulièrement sur le corpus théâtral choisi, à savoir Phèdre de Jean Racine et Partage de midi de Paul Claudel. Les présupposés théoriques préalablement définis dans la première partie vont nous permettre d’aborder, dans une deuxième partie, Phèdre de Jean Racine et Partage de midi de Paul Claudel pour tenter d’y déceler une alternance spécifique entre la voix et le silence et tenter de démontrer ainsi que ces deux pièces de théâtre se construisent comme un opéra syllabé, à défaut d’être chanté. La frontière et la lisière entre la voix et le silence sont donc, au sein de ce corpus, extrêmement poreuses. Quant à notre troisième partie, elle envisage plus spécifiquement la voix et le silence comme des concepts opératoires pour mener une réflexion méta-poétique sur le théâtre. [less ▲]

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See detailReinforcement Learning for Test Case Prioritization
Bagherzadeh, Mojtaba; Kahani, Nafiseh; Briand, Lionel UL

in IEEE Transactions on Software Engineering (2021), 48(8), 2836-2856

Continuous Integration (CI) context significantly reduces integration problems, speeds up development time, and shortens release time. However, it also introduces new challenges for quality assurance ... [more ▼]

Continuous Integration (CI) context significantly reduces integration problems, speeds up development time, and shortens release time. However, it also introduces new challenges for quality assurance activities, including regression testing, which is the focus of this work. Though various approaches for test case prioritization have shown to be very promising in the context of regression testing, specific techniques must be designed to deal with the dynamic nature and timing constraints of CI. Recently, Reinforcement Learning (RL) has shown great potential in various challenging scenarios that require continuous adaptation, such as game playing, real-time ads bidding, and recommender systems. Inspired by this line of work and building on initial efforts in supporting test case prioritization with RL techniques, we perform here a comprehensive investigation of RL-based test case prioritization in a CI context. To this end, taking test case prioritization as a ranking problem, we model the sequential interactions between the CI environment and a test case prioritization agent as an RL problem, using three alternative ranking models. We then rely on carefully selected and tailored state-of-the-art RL techniques to automatically and continuously learn a test case prioritization strategy, whose objective is to be as close as possible to the optimal one. Our extensive experimental analysis shows that the best RL solutions provide a significant accuracy improvement over previous RL-based work, with prioritization strategies getting close to being optimal, thus paving the way for using RL to prioritize test cases in a CI context. [less ▲]

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See detailLe vers claudélien, langage " naturel " ou " insolite " ? : Réflexion et analyse à partir de différentes mises en scène de Partage de midi de Paul Claudel
Deregnoncourt, Marine UL

Conference given outside the academic context (2021)

Dès qu’un metteur en scène entend appréhender le théâtre de Paul Claudel, il se voit immédiatement confronté à un problème de taille : le vers claudélien. En effet, la physionomie sensuelle et baroque des ... [more ▼]

Dès qu’un metteur en scène entend appréhender le théâtre de Paul Claudel, il se voit immédiatement confronté à un problème de taille : le vers claudélien. En effet, la physionomie sensuelle et baroque des œuvres claudéliennes « n’a rien de français ». Paul Claudel se situe véritablement en dehors de cette tradition théâtrale et se méfie d’ailleurs des acteurs français. Fort de ses séjours internationaux en tant qu’ambassadeur, ce dramaturge ne rédige pas comme la plupart des auteurs français. Tout d’abord, nous commencerons notre exposé en tentant de démontrer ce qui précède par des extraits sélectionnés de Partage de midi. Cela va nous conduire ensuite à nous intéresser plus particulièrement à cette pièce. Plus qu’aucune autre, cette œuvre, à forte teneur autobiographique, est caractérisée par l’érotisme. Ysé et Mesa, les deux protagonistes principaux, sont unis par une relation, non seulement, amoureuse, mais aussi, charnelle. En témoigne la scène 2 de l’Acte II de Partage de midi. Nous verrons, in fine, que l’histoire de la tradition des mises en scène de cette « scène d’amour » démontre que certains metteurs en scène vont davantage privilégier un érotisme cérébral et textuel, tandis que d’autres vont plutôt s’axer sur un érotisme physique et corporel, où le toucher entre les partenaires est d’importance. [less ▲]

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See detailLocating Faults with Program Slicing: An Empirical Analysis
Soremekun, Ezekiel UL; Kirschner, Lukas; Böhme, Marcel et al

in Empirical Software Engineering (2021), 26(3), 1-45

Statistical fault localization is an easily deployed technique for quickly determining candidates for faulty code locations. If a human programmer has to search the fault beyond the top candidate ... [more ▼]

Statistical fault localization is an easily deployed technique for quickly determining candidates for faulty code locations. If a human programmer has to search the fault beyond the top candidate locations, though, more traditional techniques of following dependencies along dynamic slices may be better suited. In a large study of 457 bugs (369 single faults and 88 multiple faults) in 46 open source C programs, we compare the effectiveness of statistical fault localization against dynamic slicing. For single faults, we find that dynamic slicing was eight percentage points more effective than the best performing statistical debugging formula; for 66% of the bugs, dynamic slicing finds the fault earlier than the best performing statistical debugging formula. In our evaluation, dynamic slicing is more effective for programs with single fault, but statistical debugging performs better on multiple faults. Best results, however, are obtained by a hybrid approach: If programmers first examine at most the top five most suspicious locations from statistical debugging, and then switch to dynamic slices, on average, they will need to examine 15% (30 lines) of the code. These findings hold for 18 most effective statistical debugging formulas and our results are independent of the number of faults (i.e. single or multiple faults) and error type (i.e. artificial or real errors). [less ▲]

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See detailChronique de droit des marchés financiers
Conac, Pierre-Henri UL

in Revue des Sociétés (2021)

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See detailShortcuts to Squeezed Thermal States
Dupays, Léonce UL; Chenu, Aurélia UL

in Quantum (2021)

Squeezed state in harmonic systems can be generated through a variety of techniques, including varying the oscillator frequency or using nonlinear two-photon Raman interaction. We focus on these two ... [more ▼]

Squeezed state in harmonic systems can be generated through a variety of techniques, including varying the oscillator frequency or using nonlinear two-photon Raman interaction. We focus on these two techniques to drive an initial thermal state into a final squeezed thermal state with controlled squeezing parameters—amplitude and phase—in arbitrary time. The protocols are designed through reverse engineering for both unitary and open dynamics. Control of the dissipation is achieved using stochastic processes, readily implementable via, e.g., continuous quantum measurements. Importantly, this allows controlling the state entropy and can be used for fast thermalization. The developed protocols are thus suited to generate squeezed thermal states at controlled temperature in arbitrary time. [less ▲]

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See detailOn the Exploration and Exploitation Trade-off in Cooperative Caching-enabled Networks
Bommaraveni, Srikanth; Gautam, Sumit; Vu, Thang Xuan UL et al

in IEEE WCNC 2021 proceeding (2021, April)

Edge-caching is considered as a promising solution to address network congestion and reduce delivery latency in the future by bringing the relevant contents close to users. In this context, the commonly ... [more ▼]

Edge-caching is considered as a promising solution to address network congestion and reduce delivery latency in the future by bringing the relevant contents close to users. In this context, the commonly used notion involves the storage of the most popular contents in the cache, while consequently increasing the cache hit ratio (CHR). In the majority of prior works, the content popularity is assumed to be perfectly known and often a priori. However, in reality, the content popularity has to be explored especially for uncertain contents, such as new entrants and fast varying items. In this paper, we develop a framework to analyze the joint exploration and exploitation trade-off by caching both popular and uncertain contents to enable more efficient content caching. Particularly, we formulate an optimization problem to maximize the trade-off between exploration and exploitation subject to the maximum storage capacity, guaranteed CHR, and back-haul energy budget constraints. Further, we solve the formulated mixed-integer combinatorial problem using branch-and-bound optimizer by relaxing the binary to box constraints. The superiority in performance of the proposed method over the state-of-the-art is demonstrated in terms of the CHR and back-haul energy on a realistic Movie-lens dataset. [less ▲]

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See detailThe Sources of Financing Constraints
Steri, Roberto UL; Nikolov, B.; Schmid, L.

in Journal of Financial Economics (2021)

In order to identify the relevant sources of firms' financing constraints, we ask what financial frictions matter for corporate policies. To that end, we build, solve, and estimate a range of dynamic ... [more ▼]

In order to identify the relevant sources of firms' financing constraints, we ask what financial frictions matter for corporate policies. To that end, we build, solve, and estimate a range of dynamic models of corporate investment and financing, embedding a host of financial frictions. We focus on limited enforcement, moral hazard, and trade-off models. All models share a common technology, but differ in the friction generating financing constraints. Using panel data on Compustat firms for the period 1980-2015 and a more recent dataset on private firms from Orbis, we determine which features of the observed data allow to distinguish among the models, and we assess which model or model combination performs best at rationalizing observed corporate investment and financing policies across various samples. Our tests, based on empirical policy function benchmarks, favor trade-off models for larger Compustat firms, limited commitment models for smaller firms, and moral hazard models for private firms. Our estimates point to significant financing constraints due to agency frictions and highlight the importance of identifying their relevant sources for firm valuation. [less ▲]

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See detailBridging the space systems performance-reliability gap for future deep space resources exploration and exploitation.
Pinto Gouveia, Ines UL; Graczyk, Rafal UL; Volp, Marcus UL

Poster (2021, April)

In building equipment for space exploitation, one has to trade system robustness for the high processing capabilities and low energy consumption. The high performance, low robustness approach, is ... [more ▼]

In building equipment for space exploitation, one has to trade system robustness for the high processing capabilities and low energy consumption. The high performance, low robustness approach, is acceptable, especially in Earths’ vicinity. However, in more demanding (especially high-radiation) environments, attempts had disappointing outcomes. The processing-reliability gap, between highly reliable and highly performant systems, spans 2-3 orders of magnitude. This gap brings hope, that some of this excess processing power can be utilized, in building a combination of hardware and software mechanisms that is capable of increasing robustness and resilience of otherwise susceptible semiconductor devices, while allowing to harness the remaining processing power to build affordable space systems with large degrees of autonomy, rich functionality and high bandwidth. At the CritiX research group, we aim to bridge this performance-reliability gap, by researching the enabling building blocks for constructing more reliable and more secure System-on-Chips. [less ▲]

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See detailInspecting the Mechanism of Quantitative Easing in the Euro Area
Koijen, Ralph; Koulischer, François UL; Benoît, Nguyen et al

in Journal of Financial Economics (2021)

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See detailGeographical Stratification of Green Urban Areas
Picard, Pierre M UL; Tran, Thi Thu Huyen UL

in Journal of Economic Geography (2021)

This article studies the provision of urban green areas in cities where residents have preferences for the size of and access to those areas. At the optimum, the number of urban green spaces is a ... [more ▼]

This article studies the provision of urban green areas in cities where residents have preferences for the size of and access to those areas. At the optimum, the number of urban green spaces is a nonmonotone function of distance to the city center, while the sizes and distances to other urban green areas increase as one moves to the urban fringe. This article empirically investigates those properties for the 300 largest European cities by using the Global Monitoring Environment Services Urban Atlas database (European Environmental Agency). The empirical analysis confirms the nonmonotone relationship between the number of urban green spaces and the distance to the city center. The distance between two parks also increases as one moves toward the urban fringe. [less ▲]

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See detailCanonical representations of fingers and dots trigger an automatic activation of number semantics: an EEG study on 10-year-old children
Marlair, Cathy; Lochy, Aliette UL; Buyle, Margot et al

in Neuropsychologia (2021)

Over the course of development, children must learn to map a non-symbolic representation of magnitude to a more precise symbolic system. There is solid evidence that finger and dot representations can ... [more ▼]

Over the course of development, children must learn to map a non-symbolic representation of magnitude to a more precise symbolic system. There is solid evidence that finger and dot representations can facilitate or even predict the acquisition of this mapping skill. While several behavioral studies demonstrated that canonical representations of fingers and dots automatically activate number semantics, no study so far has investigated their cerebral basis. To examine these questions, 10-year-old children were presented a behavioral naming task and a Fast Periodic Visual Stimulation EEG paradigm. In the behavioral task, children had to name as fast and as accurately as possible the numbers of dots and fingers presented in canonical and non-canonical configurations. In the EEG experiment, one category of stimuli (e.g., canonical representation of fingers or dots) was periodically inserted (1/5) in streams of another category (e.g., non-canonical representation of fingers or dots) presented at a fast rate (4 Hz). Results demonstrated an automatic access to number semantics and bilateral categorical responses at 4 Hz/5 for canonical representations of fingers and dots. Some differences between finger and dot configuration’s processing were nevertheless observed and are discussed in light of an effortful-automatic continuum hypothesis. [less ▲]

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