Results 141-160 of 10671.
Bookmark and Share    
Full Text
Peer Reviewed
See detailEfficient Preamble Detection and Time-of-Arrival Estimation for Single-Tone Frequency Hopping Random Access in NB-IoT
Chougrani, Houcine UL; Kisseleff, Steven UL; Chatzinotas, Symeon UL

in IEEE Internet of Things Journal (in press)

The narrowband internet of things (NB-IoT) standard is a new cellular wireless technology, which has been introduced by the 3rd Generation Partnership Project (3GPP) with the goal to connect massive low ... [more ▼]

The narrowband internet of things (NB-IoT) standard is a new cellular wireless technology, which has been introduced by the 3rd Generation Partnership Project (3GPP) with the goal to connect massive low-cost, low-complexity and long-life IoT devices with extended coverage. In order to improve power efficiency, 3GPP proposed a new Random Access (RA) waveform for NB-IoT based on a single-tone frequencyhopping scheme. RA handles the first connection between user equipments (UEs) and the base station (BS). Through this, UEs can be identified and synchronized with the BS. In this context, receiver methods for the detection of the new waveform should satisfy the requirements on the successful user detection as well as the timing synchronization accuracy. This is not a trivial task, especially in the presence of radio impairments like carrier frequency offset (CFO) which constitutes one of the main radio impairments besides the noise. In order to tackle this problem, we propose a new receiver method for NB-IoT Physical Random Access Channel (NPRACH). The method is designed to eliminate perfectly the CFO without any additional computational complexity and supports all NPRACH preamble formats. The associated performance has been evaluated under 3GPP conditions. We observe a very high performance compared both to 3GPP requirements and to the existing state-of-the-art methods in terms of detection accuracy and complexity. [less ▲]

Detailed reference viewed: 56 (9 UL)
Full Text
Peer Reviewed
See detailWhich Properties has an Icon? A Critical Discussion on Evaluation Methods for Standardised Data Protection Iconography
Rossi, Arianna UL; Lenzini, Gabriele UL

in Proceedings of the 8th Workshop on Socio-Technical Aspects in Security and Trust (STAST) (in press)

Following GDPR's Article12.7's proposal to use standardized icons to inform data subject in "an easily visible, intelligible and clearly legible manner," several icon sets have been developed. In this ... [more ▼]

Following GDPR's Article12.7's proposal to use standardized icons to inform data subject in "an easily visible, intelligible and clearly legible manner," several icon sets have been developed. In this paper, we firstly critically review some of those proposals. We then examine the properties that icons and icon sets should arguably fulfill according to Art.12's transparency provisions. Lastly, we discuss metrics and evaluation procedures to measure compliance with the Article. [less ▲]

Detailed reference viewed: 148 (13 UL)
Peer Reviewed
See detailCognitive processes underlying impaired decision-making in gambling disorder.
Brevers, Damien UL; Vögele, Claus UL; Billieux, Joël

in Zaleskiewicz, Thomas (Ed.) Psychological Perspectives on Financial Decision Making. (in press)

Detailed reference viewed: 62 (7 UL)
Full Text
Peer Reviewed
See detailManaging talent in mission-driven organizations: A qualitative exploration
Usanova, Ksenia UL; Geraudel, Mickaël UL; D'Armagnac, Sophie et al

in International Journal of Human Resource Management (in press)

Although there is fruitful talent management (TM) literature on large private companies, little of the TM research examines mission-driven organizations (MDOs). This study addresses this gap by presenting ... [more ▼]

Although there is fruitful talent management (TM) literature on large private companies, little of the TM research examines mission-driven organizations (MDOs). This study addresses this gap by presenting TM in the context of the not-for-profit sector in Russia. Using grounded theory, we interviewed 34 top managers to understand how they define talent and how they manage such talent. The research highlights the crucial role of social values in this context. It generates a perspective on the definition of talent that differs from that of the traditional TM literature. The variety of talent definitions creates the following three different paths for TM: community-based, innovation and learning-based, and security and status-based. Then, we derive from these paths three patterns of TM practices (“managerial”, “entrepreneurial” and “amateur”) that describe the TM practices among Russian MDOs. This study contributes to the TM literature by challenging the traditional approach to TM that focuses on large private companies in Western countries. This paper links TM with social and moral values and presents three different TM patterns, which might be helpful for CEOs, executives and TM managers. [less ▲]

Detailed reference viewed: 18 (2 UL)
Full Text
Peer Reviewed
See detailA hyperbolic proof of Pascal's Theorem
acosta, Miguel; Schlenker, Jean-Marc UL

in Mathematical Intelligencer (in press)

We provide a simple proof of Pascal's Theorem on cyclic hexagons, as well as a generalization by Möbius, using hyperbolic geometry.

Detailed reference viewed: 55 (0 UL)
Full Text
Peer Reviewed
See detailBending laminations on convex hulls of anti-de Sitter quasicircles
merlin, louis; Schlenker, Jean-Marc UL

in Proceedings of the London Mathematical Society (in press)

Let λ− and λ+ be two bounded measured laminations on the hyperbolic disk H2, which "strongly fill" (definition below). We consider the left earthquakes along λ− and λ+, considered as maps from the ... [more ▼]

Let λ− and λ+ be two bounded measured laminations on the hyperbolic disk H2, which "strongly fill" (definition below). We consider the left earthquakes along λ− and λ+, considered as maps from the universal Teichmüller space T to itself, and we prove that the composition of those left earthquakes has a fixed point. The proof uses anti-de Sitter geometry. Given a quasi-symmetric homeomorphism u:RP1→RP1, the boundary of the convex hull in AdS3 of its graph in RP1×RP1≃∂AdS3 is the disjoint union of two embedded copies of the hyperbolic plane, pleated along measured geodesic laminations. Our main result is that any pair of bounded measured laminations that "strongly fill" can be obtained in this manner. [less ▲]

Detailed reference viewed: 70 (1 UL)
Full Text
Peer Reviewed
See detailA Pharmacophore Model for SARS-CoV-2 3CLpro Small Molecule Inhibitors and in Vitro Experimental Validation of Computationally Screened Inhibitors
Glaab, Enrico UL; Manoharan, Ganesh Babu UL; Abankwa, Daniel UL

in Journal of Chemical Information and Modeling (in press)

Among the biomedical efforts in response to the current coronavirus (COVID-19) pandemic, pharmacological strategies to reduce viral load in patients with severe forms of the disease are being studied ... [more ▼]

Among the biomedical efforts in response to the current coronavirus (COVID-19) pandemic, pharmacological strategies to reduce viral load in patients with severe forms of the disease are being studied intensively. One of the main drug target proteins proposed so far is the SARS-CoV-2 viral protease 3CLpro (also called Mpro), an essential component for viral replication. Ongoing ligand- and receptor-based computational screening efforts would be facilitated by an improved understanding of the electrostatic, hydrophobic and steric features that characterize small molecule inhibitors binding stably to 3CLpro, as well as by an extended collection of known binders. Here, we present combined virtual screening, molecular dynamics simulation, machine learning and in vitro experimental validation analyses which have led to the identification of small molecule inhibitors of 3CLpro with micromolar activity, and to a pharmacophore model that describes functional chemical groups associated with the molecular recognition of ligands by the 3CLpro binding pocket. Experimentally validated inhibitors using a ligand activity assay include natural compounds with available prior knowledge on safety and bioavailability properties, such as the natural compound rottlerin (IC50 = 37 µM), and synthetic compounds previously not characterized (e.g. compound CID 46897844, IC50 = 31 µM). In combination with the developed pharmacophore model, these and other confirmed 3CLpro inhibitors may provide a basis for further similarity-based screening in independent compound databases and structural design optimization efforts, to identify 3CLpro ligands with improved potency and selectivity. Overall, this study suggests that the integration of virtual screening, molecular dynamics simulations and machine learning can facilitate 3CLpro-targeted small molecule screening investigations. Different receptor-, ligand- and machine learning-based screening strategies provided complementary information, helping to increase the number and diversity of identified active compounds. Finally, the resulting pharmacophore model and experimentally validated small molecule inhibitors for 3CLpro provide resources to support follow-up computational screening efforts for this drug target. [less ▲]

Detailed reference viewed: 32 (2 UL)
Full Text
Peer Reviewed
See detailCase study on augmented reality, digital and physical modelling with mathematical learning disabilities students in an elementary school in Luxemburg
Haas, Ben; Kreis, Yves UL; Lavicza, Zsolt

in International Journal for Technology in Mathematics Education (in press), 28(3),

This paper reports on a case study of two elementary school students with mathematical learning disabilities (MLD) (ages 10 and 11) using augmented reality (AR), digital and physical modelling in ... [more ▼]

This paper reports on a case study of two elementary school students with mathematical learning disabilities (MLD) (ages 10 and 11) using augmented reality (AR), digital and physical modelling in mathematics class. MLD students worked on modelling geometric shapes (cubes, cuboids, squared pyramids, and octahedrons) and forms (polygons) by combining real-world objects with AR and creating a copy of geometric shapes or missing parts with a 3D printing device. The study focused on the development of process skills and mathematical concepts, tried to identify changes in the visual-spatial memory, and documented the learning behaviour in class. Further, we collected data through task-based interviews with both students. Based on our findings, we present settings and manipulatives which are likely to foster process skills and mathematical concepts in geometry tasks suitable for MLD elementary school students. [less ▲]

Detailed reference viewed: 38 (5 UL)
Full Text
Peer Reviewed
See detailAn Automated Framework for the Extraction of Semantic Legal Metadata from Legal Texts
Sleimi, Amin UL; Sannier, Nicolas UL; Sabetzadeh, Mehrdad UL et al

in Empirical Software Engineering (in press)

Semantic legal metadata provides information that helps with understanding and interpreting legal provisions. Such metadata is therefore important for the systematic analysis of legal requirements ... [more ▼]

Semantic legal metadata provides information that helps with understanding and interpreting legal provisions. Such metadata is therefore important for the systematic analysis of legal requirements. However, manually enhancing a large legal corpus with semantic metadata is prohibitively expensive. Our work is motivated by two observations: (1) the existing requirements engineering (RE) literature does not provide a harmonized view on the semantic metadata types that are useful for legal requirements analysis; (2) automated support for the extraction of semantic legal metadata is scarce, and it does not exploit the full potential of artificial intelligence technologies, notably natural language processing (NLP) and machine learning (ML). Our objective is to take steps toward overcoming these limitations. To do so, we review and reconcile the semantic legal metadata types proposed in the RE literature. Subsequently, we devise an automated extraction approach for the identified metadata types using NLP and ML. We evaluate our approach through two case studies over the Luxembourgish legislation. Our results indicate a high accuracy in the generation of metadata annotations. In particular, in the two case studies, we were able to obtain precision scores of 97,2% and 82,4%, and recall scores of 94,9% and 92,4%. [less ▲]

Detailed reference viewed: 47 (0 UL)
Full Text
Peer Reviewed
See detailDiscrete-Phase Sequence Design with Stopband and PSL Constraints for Cognitive Radar
Alaeekerahroodi, Mohammad UL; Kumar, Sumit UL; Mysore Rama Rao, Bhavani Shankar UL et al

in Proceedings of EuRAD 2020 (in press)

We present the design of discrete-phase sequences considering simultaneously the peak sidelobe level (PSL) and avoiding reserved frequency bands which are occupied by narrowband interferers or ... [more ▼]

We present the design of discrete-phase sequences considering simultaneously the peak sidelobe level (PSL) and avoiding reserved frequency bands which are occupied by narrowband interferers or communications. We use the coordinate descent framework and propose an algorithm to design discrete-phase sequences with spectral power suppressed in arbitrary bands and with low auto-correlation sidelobes in terms of PSL. Our proposed algorithm exploits fast Fourier transform and is, therefore, computationally efficient. The over-the-air experiments using implementation on software-defined radio show reasonable agreement with numerical simulations and feasibility for field-deployment [less ▲]

Detailed reference viewed: 37 (5 UL)
Full Text
Peer Reviewed
See detailA Formal Framework of Software Product Line Analyses
Castro, Thiago; Teixeira, Leopoldo; Alves, Vander et al

in ACM Transactions on Software Engineering and Methodology (in press)

Detailed reference viewed: 37 (2 UL)
Full Text
Peer Reviewed
See detailGalois families of modular forms and application to weight one
Arias-de-Reyna, Sara; Legrand, François; Wiese, Gabor UL

in Israel Journal of Mathematics (in press)

We introduce Galois families of modular forms. They are a new kind of family coming from Galois representations of the absolute Galois groups of rational function fields over the rational field. We ... [more ▼]

We introduce Galois families of modular forms. They are a new kind of family coming from Galois representations of the absolute Galois groups of rational function fields over the rational field. We exhibit some examples and provide an infinite Galois family of non-liftable weight one Katz modular eigenforms over an algebraic closure of F_p for p in {3,5,7,11}. [less ▲]

Detailed reference viewed: 92 (1 UL)
Full Text
Peer Reviewed
See detailMachine Learning-Enabled Joint Antenna Selection and Precoding Design: From Offline Complexity to Online Performance
Vu, Thang Xuan UL; Chatzinotas, Symeon UL; Nguyen, van Dinh UL et al

in IEEE Transactions on Wireless Communications (in press)

We investigate the performance of multi-user multiple-antenna downlink systems in which a base station (BS) serves multiple users via a shared wireless medium. In order to fully exploit the spatial ... [more ▼]

We investigate the performance of multi-user multiple-antenna downlink systems in which a base station (BS) serves multiple users via a shared wireless medium. In order to fully exploit the spatial diversity while minimizing the passive energy consumed by radio frequency (RF) components, the BS is equipped with M RF chains and N antennas, where M < N. Upon receiving pilot sequences to obtain the channel state information (CSI), the BS determines the best subset of M antennas for serving the users. We propose a joint antenna selection and precoding design (JASPD) algorithm to maximize the system sum rate subject to a transmit power constraint and quality of service (QoS) requirements. The JASPD overcomes the non-convexity of the formulated problem via a doubly iterative algorithm, in which an inner loop successively optimizes the precoding vectors, followed by an outer loop that tries all valid antenna subsets. Although approaching the (near) global optimality, the JASPD suffers from a combinatorial complexity, which may limit its application in real-time network operations. To overcome this limitation, we propose a learning-based antenna selection and precoding design algorithm (L-ASPA), which employs a deep neural network (DNN) to establish underlaying relations between the key system parameters and the selected antennas. The proposed L-ASPD is robust against the number of users and their locations, BS's transmit power, as well as the small-scale channel fading. With a well-trained learning model, it is shown that the L-ASPD significantly outperforms baseline schemes based on the block diagonalization and a learning-assisted solution for broadcasting systems and achieves higher effective sum rate than that of the JASPA under limited processing time. In addition, we observed that the proposed L-ASPD can reduce the computation complexity by 95% while retaining more than 95% of the optimal performance. [less ▲]

Detailed reference viewed: 53 (15 UL)
Full Text
Peer Reviewed
See detailThe categorified Grothendiek-Riemann-Roch Theorem
Scherotzke, Sarah UL; Sibilla, Nicolo; Safronov, Pavel et al

in Compositio Mathematica (in press)

Detailed reference viewed: 41 (0 UL)
See detailFamilies and family values in society and culture
Albert, Isabelle UL; Emirhafizovic, Mirza; Shpigelman, Carmit-Noa et al

Book published by Information Age Publishing (in press)

This book which has been created in the framework of the EU-funded COST Action INTERFASOL brings together researchers from 22 INTERFASOL countries, who frame intergenerational family solidarity in the ... [more ▼]

This book which has been created in the framework of the EU-funded COST Action INTERFASOL brings together researchers from 22 INTERFASOL countries, who frame intergenerational family solidarity in the specific historical, cultural, social and economic context of their own country. Integrating different perspectives from social and political sciences, economics, communication, health and psychology, the book offers country-specific knowledge and new insights into family relations, family values and family policies across Europe. The volume is the product of a unique endeavor of researchers across Europe to provide up-to-date first-hand country-specific knowledge on family and intergenerational relations and will serve as a base for both country-specific as well as cross-cultural studies. [less ▲]

Detailed reference viewed: 55 (1 UL)
Full Text
Peer Reviewed
See detailReligiosity predicts unreasonable coping with COVID-19
Kranz, Dirk; Niepel, Christoph UL; Botes, E'louise UL et al

in Psychology of Religion and Spirituality (in press)

Detailed reference viewed: 32 (0 UL)
Full Text
Peer Reviewed
See detailIllusory gender-equality paradox, math self-concept, and frame-of-reference effects: New integrative explanations for multiple paradoxes
Marsh, Herbert W.; Parker, Philip D.; Guo, Jiesi et al

in Journal of Personality and Social Psychology (in press)

Detailed reference viewed: 29 (0 UL)
Full Text
Peer Reviewed
See detailEthnography: A Much-Advocated but Under-Used Qualitative Methodology in Published Accounts of Family Business Research
Fletcher, Denise Elaine UL; Adiguna, Rocky UL

in de Massis, Alfredo; kammerlander, Nadine (Eds.) Handbook of Qualitative Research Methods for Family Business (in press)

In parallel with the growing interest in qualitative research methods in family business, many family business scholars advocate greater use of ethnographic methods to advance the field further. This ... [more ▼]

In parallel with the growing interest in qualitative research methods in family business, many family business scholars advocate greater use of ethnographic methods to advance the field further. This endorsement rests at least on two arguments. On the one hand, there is a need to widen, extend, or deepen our perspectives to better understand the ‘boundary crossing’ nature of families in business. On the other hand, the majority of the proposals to extend ethnographic research aim to tap into important but still under-explored complex tacit processes of family firms. However, we found that ethnographic research in family business settings remain scarcely published. This chapter reviews a set of family business studies that have used ethnographic methods, and which have been published in business and management journals in order to examine their orientations, main findings, techniques adopted, and epistemological/ontological stances. Looking forward, we end this chapter with a brief discussion on how the practice of ethnography is changing with reference to visual and virtual applications of ethnographic principles. [less ▲]

Detailed reference viewed: 70 (0 UL)
See detailThe Evolution of EU Administrative Law
Chiti, Edoardo; Mendes, Joana UL

in Craig, Paul; de Búrca, Graínne (Eds.) The Evolution of EU Law (in press)

The chapter discusses the emergence of EU administrative law and its change over time. It maps its evolution along three main axes, concerning the internal dynamics between EU and national components, its ... [more ▼]

The chapter discusses the emergence of EU administrative law and its change over time. It maps its evolution along three main axes, concerning the internal dynamics between EU and national components, its functional objectives and legitimacy foundations. The chapter, therefore, tells a story of EU administrative law as one of advances and unresolved issues, of achievements and failures in the clarification of its regulatory project. In particular, the systemic effects of administrative convergence brought about over the years remain unstable, while the constant evolution of the forms of administrative action challenges the functions of EU administrative law of power-establishing and power-checking, and the tension between the legitimacy foundations of EU administrative law continues to cause unease. [less ▲]

Detailed reference viewed: 39 (0 UL)