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See detailDie Logik der Verschwörungstheorie : Kulturwissenschaftliche Perspektiven
Kohns, Oliver UL

Conference given outside the academic context (2021)

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See detailPoster: Commercial 5G Performance: A V2X Experiment
Frank, Raphaël UL; Hawlader, Faisal UL

in Proceedings of the 13th Vehicular Networking Conference 2021 (2021)

This poster paper presents the results of a 4G/5G measurements campaign conducted in Luxembourg City in August 2021. We test the performance of both network technologies while stationary and on the move ... [more ▼]

This poster paper presents the results of a 4G/5G measurements campaign conducted in Luxembourg City in August 2021. We test the performance of both network technologies while stationary and on the move. We report the results for download and upload throughputs, as well as the Round-trip Time (RTT). We briefly discuss the results in the context of Vehicle-to-Everything (V2X) applications. [less ▲]

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See detailCohesion and Disability in Adolescents – a Theoretical Approach
Stöcker, Anne UL

Presentation (2021, November)

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See detailSDN for Gateway Diversity Implementation in Satellite Networks
Minardi, Mario UL; Politis, Christos; Zimmer, Frank et al

in International Symposium on Networks, Computers and Communications (ISNCC), Dubai 31 Oct.-2 Nov. 2021 (2021, November)

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See detailTowards a Framework to Evaluate Cooperative Perception for Connected Vehicles
Hawlader, Faisal UL; Frank, Raphaël UL

in Proceedings of the 13th IEEE Vehicular Networking Conference 2021 (2021)

Over the past few years, Connected and Autonomous Vehicles (CAVs) have gained significant research attention. With the recent deployment of 5G networks in many metropolitan areas, new cooperative driving ... [more ▼]

Over the past few years, Connected and Autonomous Vehicles (CAVs) have gained significant research attention. With the recent deployment of 5G networks in many metropolitan areas, new cooperative driving concepts are emerging. One of those is cooperative perception, where vehicles exchange sensory information via a V2X network to maximize their awareness horizon without the need for additional and potentially expensive sensors. The idea is to distribute the processing of the sensor information to find the best trade-off between data transmission and processing time. To experimentally evaluate the performance of cooperative perception schemes is time-consuming and costly due to the expensive hardware it involves. To the best of our knowledge there is to date no open- source simulation framework that allows to transfer realistic sensor data between multiple simulated vehicles via a V2X network. In this work-in-progress paper, we address this issue by proposing an extension of the well-known CARLA open- source simulator for automated driving research. We implement a basic communication channel on top of the existing client-server architecture of CARLA and show how sensor information can be exchanged. Transferring realistic sensor information between multiple vehicles opens up a wide range of experiments to test and evaluate novel approaches to collaborative driving in simulation. [less ▲]

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See detailAI Crimes and Misdemeanors: Debating the Boundaries of Criminal Liability and Imputation
Moraiti, Anna UL

in Revue Internationale de Droit Pénal (2021), 92(1),

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See detail21st century investment protection: Africa’s innovations in investment law reform
Garcia Olmedo, Javier UL

in IBA Arbitration Newsletter (2021)

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See detailThe Zoom City: Working From Home and Urban Land Structure
Picard, Pierre M UL; Kyirakopoulou, Efthymia

Scientific Conference (2021, November)

How would cities change if working from home (WFH) persisted in the post-pandemic era? This paper investigates the impact of WFH in the internal structure of monocentric cities, where production is ... [more ▼]

How would cities change if working from home (WFH) persisted in the post-pandemic era? This paper investigates the impact of WFH in the internal structure of monocentric cities, where production is characterized by management and employee spillovers. We find that business land rents decrease, while residential land rents fall close to the business center and increase in the suburbs. WFH raises urban productivity and average wages only in large cities. The paper also studies the optimal fraction of WFH from a residents and welfare point of view. Our results suggest that workers-residents have incentives to adopt an inefficiently high WFH scheme. We finally discuss the implementation of remote work in the short run. We show that WFH implies higher benefits for long distance commuters and lower benefits or even losses for firms and short distance commuters. [less ▲]

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See detailGuest Column: It is dark before dawn
Nalon, Cláudia; Steen, Alexander UL

Article for general public (2021)

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See detailExploring the Relationship Between Subjective Age and Worry for Older Adults in Times of a Pandemic
Tingvold, Maiken UL; Albert, Isabelle UL; Murdock, Elke UL et al

in Innovation in Aging (2021, November), 5(Supplement_1), 593-593

Given the role of age as a risk factor in the covid pandemic, we examined the longitudinal cross-lagged relationship between subjective age and Covid-related worry, and possible moderators of this ... [more ▼]

Given the role of age as a risk factor in the covid pandemic, we examined the longitudinal cross-lagged relationship between subjective age and Covid-related worry, and possible moderators of this relationship. Data were obtained at two-time points (June and October 2020) by a phone/online survey, from N = 611 older participants (Mage = 69.92 years). Participants felt on average 10 and 8.5 years younger than their chronological ages at the two-time points, respectively. Younger subjective age at T1 increased the level of worry at T2 irrespective of age, perceived control and subjective health. Higher worry increased subjective age at T2, but only for those with worse subjective health. Our results show that subjective age and Covid-related worry interact over time. This relation needs to be explored further in order to understand the relationship between subjective age and well-being especially, but not only in the pandemic context. [less ▲]

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See detailStability of Primary School Value-Added Scores over Time: A Comparison Between Math and Language Achievement as Outcome Variables
Emslander, Valentin UL; Levy, Jessica UL; Scherer, Ronny et al

Scientific Conference (2021, November)

Value-added (VA) models are widely used for accountability purposes in education. Tracking a teacher’s or a school’s VA score over time forms oftentimes the basis for high-stakes decision-making and can ... [more ▼]

Value-added (VA) models are widely used for accountability purposes in education. Tracking a teacher’s or a school’s VA score over time forms oftentimes the basis for high-stakes decision-making and can determine whether teachers can keep their jobs or schools may receive certain funding. Despite their high-stakes application, the stability of VA scores over time has not yet been investigated for primary schools. Moreover, it is unclear whether different outcome measures (e.g., language and mathematics) may differ in their stability over time. In the present study, we aimed to clarify the stability of VA scores over time and investigate the differences across outcome variables. Furthermore, we wanted to showcase the real-life implications of (in)stable VA scores for single schools, with a focus on an informative use of VA scores rather than an evaluative way. The exploration of school VA scores in primary schools is especially relevant for heterogeneous student populations, for instance, in Luxembourg. Thus, we drew on representative longitudinal data from the standardized achievement tests of the Luxembourg School Monitoring Programme and examined the stability of school VA scores over two years in 146 schools (N = 7016 students). The overall stability, as measured by correlation coefficients, was moderate with r = .37 for VA scores in language and r = .34 for VA scores in mathematics from grade one to grade three. Real-life implications for schools will be discussed. [less ▲]

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See detailHybrid Beamforming for Terahertz Joint Ultra-Massive MIMO Radar-Communications
Elbir, Ahmet M.; Mishra, Kumar Vjiay; Chatzinotas, Symeon UL

in IEEE Journal of Selected Topics in Signal Processing (2021), 15(6), 1468-1483

In this paper, we investigate the hybrid beamforming problem in joint radar-communications at terahertz (THz) bands. In order to address the extremely high attenuation at THz, ultra-massive multiple-input ... [more ▼]

In this paper, we investigate the hybrid beamforming problem in joint radar-communications at terahertz (THz) bands. In order to address the extremely high attenuation at THz, ultra-massive multiple-input multiple-output (UM-MIMO) antenna systems have been proposed for THz communications to compensate propagation losses. Further, we propose a new group-of-subarrays (GoSA) UM-MIMO structure to reduce the hardware cost. We formulate the GoSA beamformer design as an optimization problem to provide a trade-off between the unconstrained communications beamformers and the desired radar beamformers. Numerical experiments demonstrate that the proposed approach outperforms the conventional approaches in terms of spectral efficiency and hardware costs. [less ▲]

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See detailMoral status and teleofunctional kinds
Hofmann, Frank UL

Presentation (2021, November)

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See detailANCHOR: locating android framework-specific crashing faults
Kong, Pingfan UL; Li, Li; Gao, Jun UL et al

in Automated Software Engineering (2021)

Android framework-specific app crashes are hard to debug. Indeed, the callback-based event-driven mechanism of Android challenges crash localization techniques that are developed for traditional Java ... [more ▼]

Android framework-specific app crashes are hard to debug. Indeed, the callback-based event-driven mechanism of Android challenges crash localization techniques that are developed for traditional Java programs. The key challenge stems from the fact that the buggy code location may not even be listed within the stack trace. For example, our empirical study on 500 framework-specific crashes from an open benchmark has revealed that 37 percent of the crash types are related to bugs that are outside the stack traces. Moreover, Android programs are a mixture of code and extra-code artifacts such as the Manifest file. The fact that any artifact can lead to failures in the app execution creates the need to position the localization target beyond the code realm. In this paper, we propose Anchor, a two-phase suspicious bug location suggestion tool. Anchor specializes in finding crash-inducing bugs outside the stack trace. Anchor is lightweight and source code independent since it only requires the crash message and the apk file to locate the fault. Experimental results, collected via cross-validation and in-the- wild dataset evaluation, show that Anchor is effective in locating Android framework-specific crashing faults. [less ▲]

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See detailIs human face recognition lateralized to the right hemisphere due to neural competition with left‑lateralized visual word recognition? A critical review
Rossion, Bruno; Lochy, Aliette UL

in Brain Structure and Function (2021)

The right hemispheric lateralization of face recognition, which is well documented and appears to be specific to the human species, remains a scientific mystery. According to a long-standing view, the ... [more ▼]

The right hemispheric lateralization of face recognition, which is well documented and appears to be specific to the human species, remains a scientific mystery. According to a long-standing view, the evolution of language, which is typically substantiated in the left hemisphere, competes with the cortical space in that hemisphere available for visuospatial processes, including face recognition. Over the last decade, a specific hypothesis derived from this view according to which neural competition in the left ventral occipito-temporal cortex with selective representations of letter strings causes right hemispheric lateralization of face recognition, has generated considerable interest and research in the scientific community. Here, a systematic review of studies performed in various populations (infants, children, literate and illiterate adults, left-handed adults) and methodologies (behavior, lesion studies, (intra)electroencephalography, neuroimaging) offers little if any support for this reading lateralized neural competition hypothesis. Specifically, right-lateralized face-selective neural activity already emerges at a few months of age, well before reading acquisition. Moreover, consistent evidence of face recognition performance and its right hemispheric lateralization being modulated by literacy level during development or at adulthood is lacking. Given the absence of solid alternative hypotheses and the key role of neural competition in the sensory–motor cortices for selectivity of representations, learning, and plasticity, a revised language-related neural competition hypothesis for the right hemispheric lateralization of face recognition should be further explored in future research, albeit with substantial conceptual clarification and advances in methodological rigor. [less ▲]

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See detailAuf- und ausgezeichnete Lebensgeschichten aus der Minett
Harnoncourt, Julia UL; Krebs, Stefan UL

Article for general public (2021)

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See detailOptimized Implementation of SHA-512 for 16-bit MSP430 Microcontrollers
Franck, Christian UL; Groszschädl, Johann UL

in Ryan, Peter Y A; Toma, Cristian (Eds.) Innovative Security Solutions for Information Technology and Communications, 14th International Conference, SecITC 2021, Bucharest, Romania, November 25-26, 2021, Revised Selected Papers (2021, November)

The enormous growth of the Internet of Things (IoT) in the recent past has fueled a strong demand for lightweight implementations of cryptosystems, i.e. implementations that are efficient enough to run on ... [more ▼]

The enormous growth of the Internet of Things (IoT) in the recent past has fueled a strong demand for lightweight implementations of cryptosystems, i.e. implementations that are efficient enough to run on resource-limited devices like sensor nodes. However, most of today's widely-used cryptographic algorithms, including the AES or the SHA2 family of hash functions, were already designed some 20 years ago and did not take efficiency in restricted environments into account. In this paper, we introduce implementation options and software optimization techniques to reduce the execution time of SHA-512 on 16-bit MSP430 microcontrollers. These optimizations include a novel register allocation strategy for the 512-bit hash state, a fast "on-the-fly" message schedule with low RAM footprint, special pointer arithmetic to avoid the need to copy state words, as well as instruction sequences for multi-bit rotation of 64-bit operands. Thanks to the combination of all these optimization techniques, our hand-written MSP430 Assembler code for the SHA-512 compression function reaches an execution time of roughly 40.6k cycles on an MSP430F1611 microcontroller. Hashing a message of 1000 bytes takes slightly below 338k clock cycles, which corresponds to a hash rate of about 338 cycles/byte. This execution time sets a new speed record for hashing with 256 bits of security on a 16-bit platform and improves the time needed by the fastest C implementations by a factor of 2.3. In addition, our implementation is extremely small in terms of code size (roughly 2.1k bytes) and has a RAM footprint of only 390 bytes. [less ▲]

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See detailThe Right to an Effective Remedy under the First Paragraph of Article 47 of the Charter
Hofmann, Herwig UL

in Peers, Steve; Harvey, Tamara; Kenner, Jeff (Eds.) et al The EU Charter of Fundamental Rights - A Commentary (2021)

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See detailNovel optofluidic concepts enabled by topological microfluidics
Sengupta, Anupam UL

in EPJ Web of Conferences (2021), 255(10002), 1-6

The coupling between flow and director orientation of liquid crystals (LCs) has been long utilized to devise wide-ranging applications spanning modern displays, medical and environmental solutions, and ... [more ▼]

The coupling between flow and director orientation of liquid crystals (LCs) has been long utilized to devise wide-ranging applications spanning modern displays, medical and environmental solutions, and bio-inspired designs and applications. LC-based optofluidic platforms offer a non-invasive handle to modulate light and material fields, both locally and dynamically. The flow-driven reorientation of the LC molecules can tailor distinct optical and mechanical responses in microfluidic confinements, and harness the coupling therein. Yet the synergy between traditional optofluidics with isotropic fluids and LC microfluidics remains at its infancy. Here, we discuss emerging optofluidic concepts based on Topological Microfluidics, leveraging microfluidic control of topological defects and defect landscapes. With a specific focus on the role of surface anchoring and microfluidic geometry, we present recent and ongoing works that harness flow-controlled director and defect configurations to modulate optical fields. The flow-induced optical attributes, and the corresponding feedback, is enhanced in the vicinity of the topological defects which geenerate distinct isotropic opto-material properties within an anisotropic matrix. By harnessing the rich interplay of confining geometry, anchoring and micro-scale nematodynamics, topological microfluidics offers a promising platform to ideate the next generation of optofluidic and optomechnical concepts. [less ▲]

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