A boundary-enhanced supervoxel method for extraction of road edges in MLS point clouds

in A boundary-enhanced supervoxel method for extraction of road edges in MLS point clouds (2020)

Road extraction plays a significant role in production of high definition maps (HD maps). This paper presents a novel boundary-enhanced supervoxel segmentation method for extracting road edge contours ... [more ▼]

Road extraction plays a significant role in production of high definition maps (HD maps). This paper presents a novel boundary-enhanced supervoxel segmentation method for extracting road edge contours from MLS point clouds. The proposed method first leverages normal feature judgment to obtain 3D point clouds global geometric information, then clusters points according to an existing method with global geometric information to enhance the boundaries. Finally, it utilizes the neighbor spatial distance metric to extract the contours and drop out existing outliers. The proposed method is tested on two datasets acquired by a RIEGL VMX-450 MLS system that contain the major point cloud scenes with different types of road boundaries. The experimental results demonstrate that the proposed method provides a promising solution for extracting contours efficiently and completely. Results show that the precision values are 1.5 times higher and approximately equal than the other two existing methods when the recall value is 0 for both tested two road datasets. [less ▲]

New insights into the early mechanisms of epileptogenesis in a zebrafish model of Dravet syndrome

in Epilepsia (2020)

QUELQUES REFLEXIONS SUR LE RETOUR DU PRINCIPE DE PRIMAUTE : A PROPOS DES ARRETS POPLAWSKI (C-573/17) ET A.K. (C-585/18, C-624/18 ET C-625/18)

in in J-C. Barbato, S. Barbou des Places, M. Dubuy, A. Moine (dir), Transformations et résilience de l'Etat, Mélanges en l'honneur de Jean-Denis Mouton (2020)

Dimensions and Categories for a Physical Activity Label for Schools in Europe: a Pilot Study in Luxembourg

in AUC Kinanthropologica (2020), 56(1), 19-27

In the frame of the European Physical Activity Label for Schools (Eu-PALS, 2020a) project diverse indicators of physical activity, physical education and sport in different European schools have been ... [more ▼]

In the frame of the European Physical Activity Label for Schools (Eu-PALS, 2020a) project diverse indicators of physical activity, physical education and sport in different European schools have been analysed. As a starting point, this paper is presenting the chosen indicators and comparing them to an already existing physical activity label for schools in Luxembourg. The choice of the quality criteria in the Eu-PALS project, which may lead to the awarding of the label, are further discussed by demonstrating the results of a pilot study at four schools in Luxembourg. This national pilot study shows not only to the participating schools in which areas they might need to improve their activities, but allows also more generally to evaluate the indicators and possibly to improve the choice. Finally, with regard to the topic of the CEREPS Conference 2019 in Prague – “Quality criteria and outcome standards for Physical Education and School Sport” – in the frame of which this study has been presented, it is also discussed whether the project contributes to make criteria and outcome standards of physical education and school sport in Europe visible and comparable. [less ▲]

Continuous-wave laser annealing of metallic layers for CuInSe2 solar cell applications: effect of preheating treatment on grain growth

in RSC Advances (2020)

"The Simplest Protocol for Oblivious Transfer'' Revisited

in Information Processing Letters (2020)

In 2015, Chou and Orlandi presented an oblivious transfer protocol that already drew a lot of attention both from theorists and practitioners due to its extreme simplicity and high efficiency. Chou and ... [more ▼]

In 2015, Chou and Orlandi presented an oblivious transfer protocol that already drew a lot of attention both from theorists and practitioners due to its extreme simplicity and high efficiency. Chou and Orlandi claimed that their protocol is universally composable secure (UC-secure) in the random oracle model under dynamic corruptions. UC-security is a very strong security guarantee that assures that, not only the protocol in itself is secure, but can be also used safely in larger protocols. Unfortunately, in this work we point out a flaw in their security proof for the case of a corrupt sender. In more detail, we define a decisional problem and we prove that, if a correct security proof for the Chou and Orlandi's protocol is provided, then this problem can be solved correctly with overwhelming probability. Therefore, the protocol of Chou and Orlandi cannot be instantiated securely with groups for which our decisional problem cannot be solved correctly with overwhelming probability. Consequently, the protocol of Chou and Orlandi cannot be instantiated with {\em all} groups $\G$ in which the CDH problem is intractable, but only with groups in which both the CDH problem is intractable and our decisional problem can be solved with overwhelming probability. After the appearance of our work, Chou and Orlandi acknowledged the problems we pointed out in their security proof and subsequent works showed additional issues, removing the claims of UC security of their protocol. [less ▲]

In situ magnetorheological SANS setup at Institut Laue-Langevin

in Colloid and Polymer Science (2020)

A magnetorheological sample environment is presented that allows for in situ magnetic field and shear flow during small-angle neutron scattering (SANS) measurements and is now available at the Institut ... [more ▼]

A magnetorheological sample environment is presented that allows for in situ magnetic field and shear flow during small-angle neutron scattering (SANS) measurements and is now available at the Institut Laue-Langevin (ILL). The setup allows performing simultaneous magnetorheological measurements together with the investigation of structural and magnetic changes on the nanometer length scale underlying the rheological response of ferrofluids. We describe the setup consisting of a commercial rheometer and a custom-made set of Helmholtz coils and show exemplarily data on the field and shear flow alignment of a dispersion of hematite nanospindles in water. [less ▲]

Distinctive body perception mechanisms in high versus low symptom reporters: a neurophysiological model for medically-unexplained symptoms

in Journal of Psychosomatic Research (2020), 137(1), 110223

OBJECTIVE: The neurophysiological processes involved in the generation of medicallyunexplained symptoms (MUS) remain unclear. This study tested three assumptions of the perception-filter model ... [more ▼]

OBJECTIVE: The neurophysiological processes involved in the generation of medicallyunexplained symptoms (MUS) remain unclear. This study tested three assumptions of the perception-filter model contributing to MUS: (I.) increased bodily signal strength (II.) decreased filter function, (III.) increased perception. METHODS: In this cross-sectional, observational study, trait MUS was assessed by a webbased survey (N=486). The upper and lower decile were identified as extreme groups of high (HSR; n=29; 26 women; Mage=26.0 years) and low symptom reporters (LSR; n=29; 21 women; Mage=28.4 years). Mean heart rate (HR) and heart rate variability (HRV), and cortisol awakening response (CAR) were assessed as indicators of bodily signal strength (I.). Heartbeat-evoked potentials (HEPs) were assessed during rest and a heartbeat perception task. HEPs reflect attentional resources allocated towards heartbeats and served as index of filter function (II.). Interoceptive accuracy (IAc) in heartbeat perception was assessed as an indicator of perception (III.). RESULTS: HSR showed higher HR and lower HRV (RMSSD) than LSR (I.), but no differences in CAR. HSR exhibited a stronger increase of HEPs when attention was focused on heartbeats than LSR (II.); there were no group differences in IAc (III.). CONCLUSIONS: The perception-filter model was partially confirmed in that HSR showed altered bodily signals suggesting higher sympathetic activity (I.); higher HEP increases indicated increased filter function for bodily signals (II.). As more attentional resources are mobilized to process heartbeats, but perception accuracy remains unchanged (III.), this overflow could be responsible for detecting minor bodily changes associated with MUS. [less ▲]

Hören

in Heßler, Martina; Liggieri, Kevin (Eds.) Technikanthropologie: Handbuch für Wissenschaft und Studium (2020)

Media Pluralism Monitor 2020: Country report Luxembourg

Report (2020)