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See detailA gravity analysis of refugee mobility using mobile phone data
Beine, Michel UL; Bertinelli, Luisito UL; Cömertpay, Rana UL et al

in Journal of Development Economics (2021)

Detailed reference viewed: 119 (11 UL)
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See detailAutomation, Growth, and Factor Shares in the Era of Population Aging
Irmen, Andreas UL

Presentation (2021)

How does population aging affect economic growth and factor shares in times of increasingly automatable production processes? The present paper addresses this question in a new macroeconomic model of ... [more ▼]

How does population aging affect economic growth and factor shares in times of increasingly automatable production processes? The present paper addresses this question in a new macroeconomic model of automation where competitive firms perform tasks to produce output. Tasks require labor and machines as inputs. New machines embody superior technological knowledge and substitute for labor in the performance of tasks. Automation is labor-augmenting in the reduced-form aggregate production function. If wages increase then the incentive to automate becomes stronger. Moreover, the labor share declines even though the aggregate production function is Cobb–Douglas. Population aging due to a higher longevity reduces automation in the short and promotes it in the long run. It boosts the growth rate of absolute and per-capita GDP in the short and the long run, lifts the labor share in the short and reduces it in the long run. Population aging due to a decline in fertility increases automation, reduces the growth rate of GDP, and lowers the labor share in the short and the long run. In the short run, it may or may not increase the growth rate of per-capita GDP, in the long run it unequivocally accelerates per-capita GDP growth. [less ▲]

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See detailPower and Bandwidth Minimization for Demand-Aware GEO Satellite Systems
Abdu, Tedros Salih UL; Kisseleff, Steven UL; Lagunas, Eva UL et al

Scientific Conference (2021)

Smart radio resource allocation combined with the recent advances of digital payloads will allow to control the transmit power and bandwidth of the satellites depending on the demand and the channel ... [more ▼]

Smart radio resource allocation combined with the recent advances of digital payloads will allow to control the transmit power and bandwidth of the satellites depending on the demand and the channel conditions of users. The system flexibility is important not only to handle divergent demand requirements but also to efficiently utilize the limited and expensive satellite resources. In this paper, we propose a demand-aware smart radio resource allocation technique, where the transmit power and the bandwidth of the GEO satellite are minimized while satisfying the user demand. The formulated optimization problem is non-convex mixed-integer nonlinear program which is difficult to solve. Hence, we apply a quadratic transform to solve the problem iteratively. The numerical results showed that the proposed scheme outperforms the benchmark schemes in terms of bandwidth utilization while accurately providing capacity-ondemand. [less ▲]

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See detailEin Schritt vor, zwei Schritte zurück? - Folgen einer verpflichtenden Zugriffsmöglichkeit auf verschlüsselte Daten
Schmitz, Sandra UL; Schiffner, Stefan UL

in Taeger, Jürgen (Ed.) Im Fokus der Rechtsentwicklung – Die Digitalisierung der Welt (2021)

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See detailA workflow and toolchain proposal for analyzing users’ perceptions in cyber threat intelligence sharing platforms
Stojkovski, Borce UL; Lenzini, Gabriele UL

in 2021 IEEE International Conference on Cyber Security and Resilience (CSR) (2021)

Cyber Threat Intelligence (CTI) sharing platforms are valuable tools in cybersecurity. However, despite the fact that effective CTI exchange highly depends on human aspects, cyber behavior in CTI sharing ... [more ▼]

Cyber Threat Intelligence (CTI) sharing platforms are valuable tools in cybersecurity. However, despite the fact that effective CTI exchange highly depends on human aspects, cyber behavior in CTI sharing platforms has been notably less investigated by the security research community. Motivated by this research gap, we ground our work in the concrete challenge of understanding users’ perceptions of information sharing in CTI platforms. To this end, we propose a conceptual workflow and toolchain that would seek to verify whether users have an accurate comprehension of how far information travels when shared in a CTI sharing platform. We contextualize our concept within MISP as a use case, and discuss the benefits of our socio-technical approach as a potential tool for security analysis, simulation, or education/training support. We conclude with a brief outline of future work that would seek to evaluate and validate the proposed model. [less ▲]

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See detailInterfered by unaccomplished academic tasks: The role of success expectations
Brassler, Nina; Grund, Axel UL; Dedic, Maid et al

in Learning and Motivation (2021), 76

Characteristics of concurring action alternatives can influence the experience and behavior in a focal action. In two scenario studies we investigated the role of success expectancies of an unaccomplished ... [more ▼]

Characteristics of concurring action alternatives can influence the experience and behavior in a focal action. In two scenario studies we investigated the role of success expectancies of an unaccomplished academic task as a relevant motivational characteristic to explain the experience and behavior during a focal leisure activity. Students imagined themselves in scenarios which were experimentally manipulated by varying the presence of a motivational conflict and the description of the concurring action. They anticipated what they would experience in these situations. Results indicate that students experience more impairments in situations of motivational conflict than when there is no conflict. Even more important, when success expectancies for the unaccomplished academic task were described as low, the anticipated impairments were higher than when expectations were described as high. Influencing expectations is discussed as one starting point for handling negative consequences of motivational conflicts due to academic tasks. [less ▲]

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See detailRadio Frequency Interference Detection Using Nonnegative Matrix Factorization
Silva, Felipe B.; Cetin, Ediz; Alves Martins, Wallace UL

in IEEE Transactions on Aerospace and Electronic Systems (2021)

This work proposes a new pre-correlation interference detection technique based on nonnegative matrix factorization (NMF) for global navigation satellite system (GNSS) signals. The proposed technique uses ... [more ▼]

This work proposes a new pre-correlation interference detection technique based on nonnegative matrix factorization (NMF) for global navigation satellite system (GNSS) signals. The proposed technique uses NMF to extract the time and frequency properties of the received signal from its spectrogram. The estimated spectral shape is then compared with the spectrogram’s time slices by means of a similarity function to detect the presence of radio frequency interference (RFI). In the presence of RFI, the NMF estimated spectral shape tends to be well-defined, resulting in high similarity levels. In contrast, in the absence of RFI, the received signal is solely comprised of noise and GNSS signals resulting in a noise like spectral shape estimate, leading to considerably reduced similarity levels. The proposal exploits this different similarity levels to detect the presence of interference. Simulation results indicate that the proposed technique yields increased detection capability with low false alarm rate even in low jammer-to-noise ratio environments for both narrow and wideband interference sources without requiring fine-tuning of parameters for specific RFI types. In addition, the proposal has reduced computational complexity, when compared with an existing statistical-based detector. [less ▲]

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See detailOn performance characterization of cascaded multiwire-PLC/MIMO-RF communication system
Ai, Yun; Kong, Long; Cheffena, Michael et al

in 2021 29th European Signal Processing Conference (EUSIPCO) (2021)

Detailed reference viewed: 34 (1 UL)
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See detailAutomation, Growth, and Factor Shares in the Era of Population Aging
Irmen, Andreas UL

Presentation (2021)

How does population aging affect economic growth and factor shares in times of increasingly automatable production processes? The present paper addresses this question in a new macroeconomic model of ... [more ▼]

How does population aging affect economic growth and factor shares in times of increasingly automatable production processes? The present paper addresses this question in a new macroeconomic model of automation where competitive firms perform tasks to produce output. Tasks require labor and machines as inputs. New machines embody superior technological knowledge and substitute for labor in the performance of tasks. Automation is labor-augmenting in the reduced-form aggregate production function. If wages increase then the incentive to automate becomes stronger. Moreover, the labor share declines even though the aggregate production function is Cobb–Douglas. Population aging due to a higher longevity reduces automation in the short and promotes it in the long run. It boosts the growth rate of absolute and per-capita GDP in the short and the long run, lifts the labor share in the short and reduces it in the long run. Population aging due to a decline in fertility increases automation, reduces the growth rate of GDP, and lowers the labor share in the short and the long run. In the short run, it may or may not increase the growth rate of per-capita GDP, in the long run it unequivocally accelerates per-capita GDP growth. [less ▲]

Detailed reference viewed: 50 (3 UL)
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See detailZitat
Busch, Christopher; Dembeck, Till UL

in Jaeger, Friedrich (Ed.) Enzyklopädie der Neuzeit Online (2021)

Detailed reference viewed: 32 (0 UL)
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See detailDemand-Aware Beam Design and User Scheduling for Precoded Multibeam GEO Satellite Systems
Jubba Honnaiah, Puneeth UL; Lagunas, Eva UL; Maturo, Nicola et al

in 25th International ITG Workshop on Smart Antennas (WSA 2021) (2021)

For many years, satellite footprints have been fixed from the design phase until the last day of the satellite operational life. Flexibility in coverage by means of reconfigurable beams is becoming ... [more ▼]

For many years, satellite footprints have been fixed from the design phase until the last day of the satellite operational life. Flexibility in coverage by means of reconfigurable beams is becoming increasingly popular thanks to the recent developments in active antenna systems. On the other hand, spatial frequency reuse combined with precoding has been shown to boost the spectral efficiency while lowering the cost per bit. In this context, and motivated by the unbalanced demand requests of the satellite users, we propose a shift from the traditional system-throughput maximization design towards a demand-Aware design, where a new beam shaping technique and user scheduling are combined to satisfy the users’ demands. Supporting numerical results are provided that validate the effectiveness of the proposed beam planning and scheduling and quantify the benefits over conventional rigid techniques. [less ▲]

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See detailClustering-based Adaptive Beam Footprint Design for 5G Urban Macro-Cell
Jubba Honnaiah, Puneeth UL; Lagunas, Eva UL; Maturo, Nicola et al

in 2021 IEEE 4th 5G World Forum (5GWF) - Track 1: 5G Technologies (2021)

In a dense 5G urban-eMBB environment, the user density and traffic loads follow a spatiotemporal variability. To meet high traffic demands, the 5G base stations exploit spatial multiplexing by means of ... [more ▼]

In a dense 5G urban-eMBB environment, the user density and traffic loads follow a spatiotemporal variability. To meet high traffic demands, the 5G base stations exploit spatial multiplexing by means of Active Antenna Systems (AAS) and beamforming. However, pedestrian and vehicular users are highly mobile, rendering non-dynamic beamforming designs totally inefficient in terms of meeting the users’ demand requests. In particular, the latter results in either overload or underutilized beams in a cell. Hence, a practical approach to meet such spatio-temporal heterogeneous demand is to consider dynamic and adaptive beam footprint design that takes into account both the actual users’ position as well as the traffic loads. In this paper, we first study and evaluate the state-of-the-art fixed cell beamforming (based on ITU-R M.2412-0) in a test environment and highlight its drawbacks. Next, we propose a adaptive macro-cell beam footprint design where the beams are dynamically shaped based on the spatial users distribution and their demand requests. Numerical simulations demonstrate the high system performance achieved by the proposed methodology. [less ▲]

Detailed reference viewed: 97 (13 UL)
See detailCentral limit theorem for a birth-growth model with Poisson arrivals and random growth speed.
Bhattacharjee, Chinmoy UL; Molchanov, Ilya; Turin, Riccardo

E-print/Working paper (2021)

Detailed reference viewed: 45 (0 UL)
See detailFace au “Heraus!” Regards allemands sur la Belgique (1918-1920)
Brüll, Christoph UL

in Dumoulin, Michel; Lanneau, Catherine (Eds.) La Belgique et les traités de paix. De Versailles à Sèvres (1919-1920) (2021)

Detailed reference viewed: 30 (0 UL)
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See detailLimit theorems for additive functionals of the fractional Brownian motion
Jaramillo, Arturo; Nourdin, Ivan UL; Nualart, David et al

E-print/Working paper (2021)

Detailed reference viewed: 37 (1 UL)
See detailSpätlese. Aufsätze aus den ersten beiden Jahrzehnten des 21. Jahrhunderts. Festgabe für Franz Irsigler zum 80. Geburtstag
Uhrmacher, Martin UL; Pauly, Michel UL; Embach, Michael et al

Book published by Verlag für Geschichte und Kultur (2021)

Detailed reference viewed: 202 (5 UL)
See detailLes relations belgo-luxembourgeoises depuis 1919. Perspectives historiques et historiographiques
Brüll, Christoph UL

in Clément, Franz (Ed.) Belgique - Luxembourg : 100 ans de collaboration (2021)

Detailed reference viewed: 48 (1 UL)
See detailTHE EU SUSTAINABLE FINANCE FRAMEWORK IN LIGHT OF INTERNATIONAL STANDARDS
Bodellini, Marco UL

E-print/Working paper (2021)

Detailed reference viewed: 43 (0 UL)
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See detailDifferentiation of primary CNS lymphoma and glioblastoma using Raman spectroscopy and machine learning algorithms
Klamminger, Gilbert Georg; Klein, Karoline; Mombaerts, Laurent UL et al

in Free Neuropathology (2021), 2

Objective and Methods: Timely discrimination between primary CNS lymphoma (PCNSL) and glioblastoma is crucial for diagnostics and therapy, but most importantly also determines the intraoperative surgical ... [more ▼]

Objective and Methods: Timely discrimination between primary CNS lymphoma (PCNSL) and glioblastoma is crucial for diagnostics and therapy, but most importantly also determines the intraoperative surgical course. Advanced radiological methods allow this to a certain extent but ultimately, biopsy is still necessary for final diagnosis. As an upcoming method that enables tissue analysis by tracking changes in the vibrational state of molecules via inelastic scattered photons, we used Raman Spectroscopy (RS) as a label free method to examine specimens of both tumor entities intraoperatively, as well as postoperatively in formalin fixed paraffin embedded (FFPE) samples. Results: We applied and compared statistical performance of linear and nonlinear machine learning algorithms (Logistic Regression, Random Forest and XGBoost), and found that Random Forest classification distinguished the two tumor entities with a balanced accuracy of 82,4% in intraoperative tissue condition and with 94% using measurements of distinct tumor areas on FFPE tissue. Taking a deeper insight into the spectral properties of the tumor entities, we describe different tumor-specific Raman shifts of interest for classification. Conclusions: Due to our findings, we propose RS as an additional tool for fast and non-destructive, perioperative tumor tissue discrimination, which may augment treatment options at an early stage. RS may further serve as a useful additional tool for neuropathological diagnostics with little requirements for tissue integrity. [less ▲]

Detailed reference viewed: 54 (3 UL)
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See detailProgress at Snail’s Pace? Regional Involvement and Treaty Changes since 1990
Högenauer, Anna-Lena UL

in Abels, Gabriele (Ed.) From Takers to Shapers? Challenges for Regions in a Dynamic EU Polity (2021)

From the mid-1980s, the sub-state level has become increasingly recognized as a political actor in European Union (EU) politics. Starting with the Treaty of Maastricht, a series of EU Treaty changes have ... [more ▼]

From the mid-1980s, the sub-state level has become increasingly recognized as a political actor in European Union (EU) politics. Starting with the Treaty of Maastricht, a series of EU Treaty changes have recognized the democratic role of regions and local authorities and have created consultative mechanisms for them. However, the very regions that pushed for these changes – namely the strong legislative regions like the German Länder and the Belgian regions – became dissatisfied with the innovations of the Treaty of Maastricht almost as soon as they were implemented. As a result, their strategy focused increasingly on limiting transfers of competences to the European level in areas of importance to regions. The aim of this contribution is therefore to examine the evolution of the demands of strong legislative regions and their rights on the European level. It argues that the diversity of European regions has made it difficult to reconcile European integration with the status and functioning of strong legislative regions. [less ▲]

Detailed reference viewed: 66 (1 UL)