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See detailEnhanced Automotive Target Detection through Radar and Communications Sensor Fusion
Dokhanchi, Sayed Hossein UL; Mysore Rama Rao, Bhavani Shankar UL; Mishra, Kumar Vijay et al

in ICASSP 2021 - 2021 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) (2021, May 13)

This paper shows the enhancement in detection performance in an automotive scenario by leveraging the backscattered communication signals from vehicles at the target scene. A sensor fusion algorithm is ... [more ▼]

This paper shows the enhancement in detection performance in an automotive scenario by leveraging the backscattered communication signals from vehicles at the target scene. A sensor fusion algorithm is proposed to benefit from the information from radar and communication to improve the final range estimates. We demonstrate theoretically and illustrate through simulation that our proposed scheme enhances the radar detection performance. Thus the proposed scheme offers a solution for augmenting existing sensing capabilities to enhance detecting capabilities in a dynamic automotive scenario. [less ▲]

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See detailHistoria Pública: Museos y Comunidades Digitales en América Latina
Cauvin, Thomas UL

Speeches/Talks (2021)

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See detailProbing Quantum Speed Limits with Ultracold Gases
Del Campo Echevarria, Adolfo UL

in Physical Review Letters (2021)

Quantum speed limits (QSLs) rule the minimum time for a quantum state to evolve into a distinguishable state in an arbitrary physical process. These fundamental results constrain a notion of distance ... [more ▼]

Quantum speed limits (QSLs) rule the minimum time for a quantum state to evolve into a distinguishable state in an arbitrary physical process. These fundamental results constrain a notion of distance traveled by the quantum state, known as the Bures angle, in terms of the speed of evolution set by nonadiabatic energy fluctuations. I theoretically propose how to measure QSLs in an ultracold quantum gas confined in a timedependent harmonic trap. In this highly-dimensional system of continuous variables, quantum tomography is prohibited. Yet, QSLs can be probed whenever the dynamics is self-similar by measuring as a function of time the cloud size of the ultracold gas. This makes it possible to determine the Bures angle and energy fluctuations, as I discuss for various ultracold atomic systems. [less ▲]

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See detailLuxembourg, la première capitale de l’Europe unie
Danescu, Elena UL; Pallage, Stéphane UL; Bettel, Xavier et al

Presentation (2021, May 06)

Préfigurée par la Déclaration que Robert Schuman prononce le 9 mai 1950, la Communauté européenne du Charbon et de l’Acier (CECA) devient réalité le 18 avril 1951, lorsque les représentants de six États ... [more ▼]

Préfigurée par la Déclaration que Robert Schuman prononce le 9 mai 1950, la Communauté européenne du Charbon et de l’Acier (CECA) devient réalité le 18 avril 1951, lorsque les représentants de six États fondateurs – Allemagne, Belgique, France, Italie, Luxembourg et Pays-Bas – concluent, pour une durée de 50 ans, le traité de Paris. L’architecture institutionnelle de cette première communauté européenne dessine l’actuel équilibre des pouvoirs de l’Union européenne reposant sur: la Haute Autorité (la Commission européenne) ; le Conseil spécial de ministres; l’Assemblée commune (le Parlement européen); la Cour de justice – indépendante. En juillet 1952, Luxembourg-ville est choisie comme lieu de travail provisoire de la CECA. Dès le 10 août 1952, la Haute Autorité s’installe dans le bâtiment qui abrite ac-tuellement la Spuerkeess. Le 10 décembre, la Cour de justice de la CECA tient sa séance d’ouverture solennelle au Cercle Municipal, à la place d’Armes. Luxembourg-ville devient siège européen aux côtés de Strasbourg (qui accueille l’Assemblée commune) et de Bruxelles, qui s’y rajoute en 1958, après la création de la Communauté économique européenne et l’Euratom. La fusion des exécutifs com-munautaires (1965) confirme Luxembourg comme siège judiciaire et financier européen. Ce n’est qu’en 1992 que le Conseil européen d’Édimbourg consacre la tripolarité Luxembourg – Bruxelles – Strasbourg comme « capitales permanentes de l’Union européenne. [less ▲]

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See detailDenken in Kategorien
Bucher, Heike; Kerger, Sylvie UL

Article for general public (2021)

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See detailLiquid crystal elastomer shells with topological defect-defined actuation: Complex shape morphing, opening/closing, and unidirectional rotation
Sharma, Anjali UL; Stoffel, A. M.; Lagerwall, Jan UL

in Journal of Applied Physics (2021), 129(17), 174701

We produce hollow sphere liquid crystal elastomer (LCE) actuators from a nematic precursor mixture, brought into the shape of a self-closing shell with tangential anchoring of the director field n(r ... [more ▼]

We produce hollow sphere liquid crystal elastomer (LCE) actuators from a nematic precursor mixture, brought into the shape of a self-closing shell with tangential anchoring of the director field n(r), using a solvent-assisted microfluidic technique. By separating the shell production from the polymerization and cross-linking, the precursor is allowed to approach its equilibrium n(r) configuration in the shell, spontaneously forming topological defects of total strength +2. However, the photopolymerization into an LCE induces a brief but strong distortion of the overall n(r) and the defect configuration, even changing the ground state shape in the case of thick shells. The resulting LCE shells show a rich capacity for reversible shape morphing upon heating and cooling, the exact actuation mode defined by n(r), and the final defect configuration stabilized at the end of polymerization. In regions with a single +1 defect, a reversal of curvature from concave to convex is found, punctured shells exhibit a strong shape change between a nearly closed sphere at low temperature and an open-ended spherocylinder at high temperature, and all shells rotate upon actuation when suspended in a fluid. As the rotation is stronger during relaxation than during actuation, thus breaking the symmetry, the net rotation is unidirectional. [less ▲]

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See detailSensation: Sonifying the Urban Running Experience
Van Renswouw, L.; Neerhof, J.; Vos, S. et al

in Conference on Human Factors in Computing Systems - Proceedings (2021, May)

Following the need to promote physical activity as a part of a healthy lifestyle, in this study we focus on encouraging more physical activity by improving the experience, with running as an example of a ... [more ▼]

Following the need to promote physical activity as a part of a healthy lifestyle, in this study we focus on encouraging more physical activity by improving the experience, with running as an example of a popular outdoor activity. Running in nature is often described as more pleasant and relaxing than running in the city, yet in urban environments it is difficult to integrate true nature in one's running route. To bridge this gap we designed Sensation, a sonified running track that provides sensations of nature using audio feedback. Sensation senses the footsteps of runners and produces synced sounds of footsteps in several nature environments to augment the urban landscape. This way, Sensation aims to enhance the environmental factors that contribute to the positive feelings people experience during a run. We report on insights gathered during our Research-through-Design process, as well as a preliminary user test of this sonified running track. © 2021 Owner/Author. [less ▲]

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See detailCrafting On-Skin Interfaces: An Embodied Prototyping Journey
Restrepo-Villamizar, J.; Vos, S.; Verhagen, E. et al

in DIS 2021 - Proceedings of the 2021 ACM Designing Interactive Systems Conference: Nowhere and Everywhere (2021, May)

This pictorial presents a design exploration of On-Skin Interfaces for recreational running. By integrating principles of interaction design, art and psychology, we explore the design of unconventional ... [more ▼]

This pictorial presents a design exploration of On-Skin Interfaces for recreational running. By integrating principles of interaction design, art and psychology, we explore the design of unconventional interfaces that facilitate the intuitive understanding of biofeedback and physiological-related information. We explored how principles from agency and bodily ownership can be applied in the design of sport- related wearables. Through our embodied prototyping journey, we gained insights on the implications of using the skin as an interactive design material. We focused on diverse materiality explorations to uncover and highlight the possibilities and challenges of materializing both functional and appealing On-Skin Interfaces. We synthesize and refl on our theoretical and practical explorations and deliver actionable insights for this growing fi of bodily and unconventional interfaces. © 2021 Owner/Author. [less ▲]

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See detailCohort profile: DOLORisk Dundee: a longitudinal study of chronic neuropathic pain
Hébert, Harry L; Veluchamy, Abirami; Baskozos, Georgios et al

in BMJ Open (2021), 11(5),

Purpose: Neuropathic pain is a common disorder of the somatosensory system that affects 7%-10% of the general population. The disorder places a large social and economic burden on patients as well as ... [more ▼]

Purpose: Neuropathic pain is a common disorder of the somatosensory system that affects 7%-10% of the general population. The disorder places a large social and economic burden on patients as well as healthcare services. However, not everyone with a relevant underlying aetiology develops corresponding pain. DOLORisk Dundee, a European Union-funded cohort, part of the multicentre DOLORisk consortium, was set up to increase current understanding of this variation in onset. In particular, the cohort will allow exploration of psychosocial, clinical and genetic predictors of neuropathic pain onset. Participants: DOLORisk Dundee has been constructed by rephenotyping two pre-existing Scottish population cohorts for neuropathic pain using a standardised 'core' study protocol: Genetics of Diabetes Audit and Research in Tayside Scotland (GoDARTS) (n=5236) consisting of predominantly type 2 diabetics from the Tayside region, and Generation Scotland: Scottish Family Health Study (GS:SFHS; n=20 221). Rephenotyping was conducted in two phases: a baseline postal survey and a combined postal and online follow-up survey. DOLORisk Dundee consists of 9155 participants (GoDARTS=1915; GS:SFHS=7240) who responded to the baseline survey, of which 6338 (69.2%; GoDARTS=1046; GS:SFHS=5292) also responded to the follow-up survey (18 months later). Findings to date: At baseline, the proportion of those with chronic neuropathic pain (Douleur Neuropathique en 4 Questions questionnaire score ≥3, duration ≥3 months) was 30.5% in GoDARTS and 14.2% in Generation Scotland. Electronic record linkage enables large scale genetic association studies to be conducted and risk models have been constructed for neuropathic pain. Future plans: The cohort is being maintained by an access committee, through which collaborations are encouraged. Details of how to do this will be available on the study website (http://dolorisk.eu/). Further follow-up surveys of the cohort are planned and funding applications are being prepared to this effect. This will be conducted in harmony with similar pain rephenotyping of UK Biobank. [less ▲]

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See detailEncoding Hidden Information onto Surfaces Using Polymerized Cholesteric Spherical Reflectors
Geng, Yong UL; Kizhakidathazhath, Rijeesh UL; Lagerwall, Jan UL

in Advanced Functional Materials (2021)

The omnidirectional Bragg reflection of cholesteric liquid crystals molded into spheres turns them into narrow-band retroreflectors with distinct circular polarization. It is shown that these cholesteric ... [more ▼]

The omnidirectional Bragg reflection of cholesteric liquid crystals molded into spheres turns them into narrow-band retroreflectors with distinct circular polarization. It is shown that these cholesteric spherical reflectors (CSRs) can encode information onto surfaces for far-field optical read-out without false positives, as the selective retroreflectivity allows the background to be easily subtracted. In order to hide the encoding from detection by the human eye, the retroreflection band is tuned to the near-UV or IR spectra, allowing ubiquitous deployment of CSRs in human-populated environments. This opens diverse application opportunities, for instance, in supporting safe robotic navigation and in augmented reality. A key breakthrough is our ability to permanently embed CSRs in a binder such that undesired scattering and reflections are minimized. This is achieved by realizing CSRs as shells that are polymerized from the liquid crystalline state. The resulting shrinkage around an incompressible fluid deforms the thinnest region of each shell such that it ruptures at a well-defined point. This leaves a single small hole in every CSR that gives access to the interior, allowing complete embedding in the binder with optimized refractive index, minimizing visibility. [less ▲]

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See detailMAANA: An Automated Tool for DoMAin-specific HANdling of Ambiguity
Ezzini, Saad UL; Abualhaija, Sallam UL; Arora, Chetan et al

in Companion Proceedings of the 43rd International Conference on Software Engineering (2021, May)

MAANA (in Arabic: “meaning”) is a tool for performing domain-specific handling of ambiguity in requirements. Given a requirements document as input, MAANA detects the requirements that are potentially ... [more ▼]

MAANA (in Arabic: “meaning”) is a tool for performing domain-specific handling of ambiguity in requirements. Given a requirements document as input, MAANA detects the requirements that are potentially ambiguous. The focus of MAANA is on coordination ambiguity and prepositional-phrase attachment ambiguity; these are two common ambiguity types that have been studied in the requirements engineering literature. To detect ambiguity, MAANA utilizes structural patterns and a set of heuristics derived from a domain-specific corpus. The generated analysis file after running the tool can be reviewed by requirements analysts. Through combining different knowledge sources, MAANA highlights also the requirements that might contain unacknowledged ambiguity. That is when the analysts understand different interpretations for the same requirement, without explicitly discussing it with the other analysts due to time constraints. This artifact paper presents the details of MAANA. MAANA is associated with the ICSE 2021 technical paper titled “Using Domain-specific Corpora for Improved Handling of Ambiguity in Requirements”. The tool is publicly available on GitHub and Zenodo. [less ▲]

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See detailVirtual reality gaming for pain distraction - Investigation of attentional and psychophysiological effects
Holl, Elisabeth UL; Rischer, Katharina Miriam UL; Battistutta, Layla UL et al

Scientific Conference (2021, May)

Virtual reality has been shown to be a powerful method to divert attention away from pain (Malloy & Milling, 2010) and has been used successfully to temporally relieve patients from pain in clinical ... [more ▼]

Virtual reality has been shown to be a powerful method to divert attention away from pain (Malloy & Milling, 2010) and has been used successfully to temporally relieve patients from pain in clinical settings. However, little is known about the underlying attentional processes involved in pain processing in virtual reality. Therefore, as one of the first studies, this project investigates the role of especially cognitive factors influencing distraction from pain. N = 90 healthy participants played the video game Subnautica in two virtual reality conditions (high vs. low cognitive load). To assess the distraction effect, pain thresholds and psychophysiological measures were assessed during play. Additionally, executive functions and self-reported measures on, e.g., presence, simulation sickness and pain-related subjects were assessed. Results suggest that interactive virtual reality games are a potential tool to alter pain processing, regardless of the level of cognitive load. [less ▲]

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See detailMotivation to Play Scale (MOPS): Measuring Gaming Motivation With a Comprehensive Instrument
Holl, Elisabeth UL; Wagener, Gary Lee UL; Melzer, André UL

Scientific Conference (2021, May)

With the growing interest in gaming, the motivation why people play has become a focus of research. Scales assessing gaming motivation are mostly based on either motivation theories or on self-constructed ... [more ▼]

With the growing interest in gaming, the motivation why people play has become a focus of research. Scales assessing gaming motivation are mostly based on either motivation theories or on self-constructed items adapted to specific genres. Despite the amount of existing scales, measures often lack validation or leave out important and novel motives. Therefore, the Motivation to Play Scale (MOPS), a work-in-progress project, aims at identifying a holistic instrument validated by systematically collecting and evaluating already existing items. A first evaluation survey (N = 555) resulted in preliminary version of the MOPS measuring 14 gaming motives (e.g., competition, escapism) using 59 items (α = .94). [less ▲]

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See detailConsiderations on Dynamic Pricing in Carsharing Operations
Giorgione, Giulio UL; Viti, Francesco UL

Scientific Conference (2021, May)

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See detailAn equilibrium model for Mobility-as-a-Service
Bandiera, Claudia UL; Connors, Richard UL; Viti, Francesco UL

Scientific Conference (2021, May)

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See detailA holding control strategy for diverging bus lines
Laskaris, Georgios; Rinaldi, Marco; Cats, Oded et al

in Transportation Research. Part C, Emerging Technologies (2021)

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See detailDas Archivieren der Pandemie: Rapid Response Collecting in Luxemburg
Zumthurm, Tizian UL

Article for general public (2021)

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See detailTrade-offs in phenotypic noise synchronize emergent topology to actively enhance transport in microbial environments
Dhar, Jayabrata UL; Thai, Le Phuong Anh UL; Ghoshal, Arkajyoti UL et al

E-print/Working paper (2021)

Phenotypic noise underpins homeostasis and fitness of individual cells. Yet, the extent to which noise shapes cell-to-population properties in microbial active matter remains poorly understood. By ... [more ▼]

Phenotypic noise underpins homeostasis and fitness of individual cells. Yet, the extent to which noise shapes cell-to-population properties in microbial active matter remains poorly understood. By quantifying variability in confluent \textit{E.coli} strains, we catalogue noise across different phenotypic traits. The noise, measured over different temperatures serving as proxy for cellular activity, spanned more than two orders of magnitude. The maximum noise was associated with the cell geometry and the critical colony area at the onset of mono-to-multilayer transition (MTMT), while the lower bound was set by the critical time of the MTMT. Our results, supported by a hydrodynamic model, suggest that a trade-off between the noise in the cell geometry and the growth rate can lead to the self-regulation of the MTMT timing. The MTMT cascades synchronous emergence of hydrodynamic fields, actively enhancing the micro-environmental transport. Our results highlight how interplay of phenotypic noise triggers emergent deterministic properties, and reveal the role of multifield topology--of the colony structure and hydrodynamics--to insulate confluent systems from the inherent noise associated with natural cell-environment settings. [less ▲]

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