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See detailThe return of borders. Ein Kommentar zur Grenzraumforschung in Zeiten der Vergrenzungen
Wille, Christian UL

in Terrollion, Karl; Theis, Roland; Weber, Florian (Eds.) Grenzerfahrungen | Expériences transfrontalières. COVID-19 und die deutsch-französischen Beziehungen | Les relations franco-allemandes à l’heure de la COVID-19 (in press)

Der Beitrag geht von einem angebrochenen Zeitalter der Vergrenzungen aus und skizziert, wie die interdisziplinäre Grenzforschung und europäische Grenzraumforschung mit der Renaissance von Grenzen umgehen ... [more ▼]

Der Beitrag geht von einem angebrochenen Zeitalter der Vergrenzungen aus und skizziert, wie die interdisziplinäre Grenzforschung und europäische Grenzraumforschung mit der Renaissance von Grenzen umgehen. Dabei wird die enge Verflechtung der Grenzraumforschung mit dem politischen Projekt der europäischen Integration und ihr Fokus auf die Permeabilität von Grenzen deutlich. Allerdings wird zugleich erkennbar, dass die Leitidee eines Europa ohne Grenzen in den letzten Jahrzehnten erheblich an Strahlkraft eingebüßt hat, zuletzt durch die temporäre Verstärkung der Kontrollen im Schengen-Raum (2015/2016) und die temporären Schließungen der EU-Grenzen (2020). Die zunehmend um sich greifenden Vergrenzungsprozesse in Grenzregionen werden außerdem im Alltag ihrer Einwohner*innen nachgezeichnet. Der Beitrag schlägt abschließend eine Perspektivweitung der europäischen Grenzraumforschung vor, die die Durabilität von Grenzen berücksichtigt und somit Vergrenzungen an den EU-Binnengrenzen besser zu verstehen hilft. [less ▲]

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See detailIdentifying Math and Reading Difficulties of Multilingual Children: Effects of Different Cut-offs and Reference Groups
Martini, Sophie Frédérique UL; Schiltz, Christine UL; Fischbach, Antoine UL et al

in Herzog, Moritz; Gürsoy, Erkan; Fritz-Stratmann, Annemarie (Eds.) Diversity Dimensions in Mathematics and Language Learning (in press)

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See detailThe Gateway Science: A Review of Astronomy in the OECD School Curricula
Salimpoura, Saeed; Bartlett, Sophie; Fitzgerald, Michael T. et al

in Research in Science Education (in press)

Astronomy is considered by many to be a gateway science owing to its ability to inspire curiosity in everyone irrespective of age, culture or general inclination to science. While the inclusion of ... [more ▼]

Astronomy is considered by many to be a gateway science owing to its ability to inspire curiosity in everyone irrespective of age, culture or general inclination to science. While the inclusion of astronomy in the school curriculum has waxed and waned over the years, in the current era, where there is a global push to get more students engaged in Science, Technology, Engineering and Mathematics (STEM), astronomy provides an invaluable conduit to bring about this shift. This paper highlights the results of a study which has reviewed the presence and extent to which astronomy has been incorporated into the school curriculum of the Organisation for Economic and Cooperative Development (OECD) member countries as well as two non-OECD countries strong in astronomy research, China and South Africa, and one international curriculum, the International Baccalaureate Diploma programme. A total of 52 national curricula from 37 countries were reviewed. The results revealed that overall astronomy and its related topics are prevalent in at least one grade in all curricula across the OECD, China and South Africa. Of the 52 national curricula, 44 of them had astronomy related topics in grade 6. Out of the 52 national curricula, 40 introduced astronomy-related topics in grade 1, while 14 of them had astronomy-related topics explicitly mentioned in all grades. The most common keywords were related to basic astronomy concepts, such as the Earth, the Sun, the Moon, and the stars, all have occurrences of over 100. Relational textual analysis also revealed that all the major concepts could be encompassed across two broad themes of Earth and Physics. [less ▲]

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See detailLe concept de concept dans la philosophie de Deleuze : Polymorphisme(s) et pluralisme(s)
Burks, Deven UL

Book published by L'Harmattan (in press)

Qu’est-ce que la philosophie ? Pour Deleuze, il s’agit de la création de concepts qui répondent chacun à un problème précis. Selon la théorie du concept deleuzienne, les concepts philosophiques partagent ... [more ▼]

Qu’est-ce que la philosophie ? Pour Deleuze, il s’agit de la création de concepts qui répondent chacun à un problème précis. Selon la théorie du concept deleuzienne, les concepts philosophiques partagent en plus une certaine forme : une multiplicité de composantes, un volume absolu, des variations intensives, un ordre de voisinage. Or, cette interprétation de l’activité philosophique est à son tour un concept : « le concept de concept. » Comme tout autre, ce concept répond à un problème – « quel est le propre de la philosophie ? » – et il recèle une multiplicité, un volume, des variations, un voisinage. Même si le concept de concept saisit l’essentiel de l’activité philosophique, on pourra alors croire qu’il est d’une portée limitée et voué à être dépassé comme n’importe quel autre concept. Sinon, il encourt le risque d’auto-réfutation : vrai sur le fond mais faux dans la forme. L’étude présente demande sous quelles conditions la théorie du concept deleuzienne peut échapper à ce sort et propose une lecture transcendantale selon laquelle le concept de concept est la condition de l’expérience et du discours philosophiques. [less ▲]

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See detailThe sense of belonging in the context of migration – Meanings and developmental trajectories
Albert, Isabelle UL; Barros Coimbra, Stephanie UL

in Wagoner, Brady; Christiansen, Bo; Demuth, Carolin (Eds.) Culture as a Process (in press)

The need to belong is fundamental to human beings and constitutes a basis for subjective well-being. It is closely linked to further concepts, such as identification, connectedness, attachment, fitting in ... [more ▼]

The need to belong is fundamental to human beings and constitutes a basis for subjective well-being. It is closely linked to further concepts, such as identification, connectedness, attachment, fitting in and feeling “at home”. The present contribution will focus on the sense of belonging in the context of migration in its different facets - cultural, social and spatial - and in relation to different points of reference - national, ethnic and transnational belonging. Applying the lens of cultural psychology of semiotic mediation, the development of a sense of belonging will be discussed with regard to first generation migrants and their second-generation offspring in a life span perspective, drawing on concepts such as proculturation as well as the Trajectory Equifinality Approach. [less ▲]

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See detailKilling Stubborn Mutants with Symbolic Execution
Titcheu Chekam, Thierry UL; Papadakis, Mike UL; Cordy, Maxime UL et al

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

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See detailTest Selection for Deep Learning Systems
Ma, Wei UL; Papadakis, Mike UL; Tsakmalis, Anestis et al

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

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See detailLa Charte dans l'action extérieure de l'Union européenne
Neframi, Eleftheria UL

in Iliopoulou Penot, Anastasia; Xenou, Lamprini (Eds.) La Charte des droits fondamentaux de l'UE (in press)

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See detailDigital Twins Are Not Monozygotic -- Cross-Replicating ADAS Testing in Two Industry-Grade Automotive Simulators
Borg, Markus; Ben Abdessalem (helali), Raja UL; Nejati, Shiva UL et al

in 2021 IEEE 14th International Conference on Software Testing, Validation and Verification (ICST) (in press)

The increasing levels of software- and data-intensive driving automation call for an evolution of automotive software testing. As a recommended practice of the Verification and Validation (V&V) process of ... [more ▼]

The increasing levels of software- and data-intensive driving automation call for an evolution of automotive software testing. As a recommended practice of the Verification and Validation (V&V) process of ISO/PAS 21448, a candidate standard for safety of the intended functionality for road vehicles, simulation-based testing has the potential to reduce both risks and costs. There is a growing body of research on devising test automation techniques using simulators for Advanced Driver-Assistance Systems (ADAS). However, how similar are the results if the same test scenarios are executed in different simulators? We conduct a replication study of applying a Search-Based Software Testing (SBST) solution to a real-world ADAS (PeVi, a pedestrian vision detection system) using two different commercial simulators, namely, TASS/Siemens PreScan and ESI Pro-SiVIC. Based on a minimalistic scene, we compare critical test scenarios generated using our SBST solution in these two simulators. We show that SBST can be used to effectively and efficiently generate critical test scenarios in both simulators, and the test results obtained from the two simulators can reveal several weaknesses of the ADAS under test. However, executing the same test scenarios in the two simulators leads to notable differences in the details of the test outputs, in particular, related to (1) safety violations revealed by tests, and (2) dynamics of cars and pedestrians. Based on our findings, we recommend future V&V plans to include multiple simulators to support robust simulation-based testing and to base test objectives on measures that are less dependant on the internals of the simulators. [less ▲]

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See detailShort-Packet Communications for MIMO NOMA Systems over Nakagami-m Fading: BLER and Minimum Blocklength Analysis
Tran, Duc Dung UL; Sharma, Shree Krishna UL; Chatzinotas, Symeon UL et al

in IEEE Transactions on Vehicular Technology (in press)

Recently, ultra-reliable and low-latency communications (URLLC) using short-packets has been proposed to fulfill the stringent requirements regarding reliability and latency of emerging applications in 5G ... [more ▼]

Recently, ultra-reliable and low-latency communications (URLLC) using short-packets has been proposed to fulfill the stringent requirements regarding reliability and latency of emerging applications in 5G and beyond networks. In addition, multiple-input multiple-output non-orthogonal multiple access (MIMO NOMA) is a potential candidate to improve the spectral efficiency, reliability, latency, and connectivity of wireless systems. In this paper, we investigate short-packet communications (SPC) in a multiuser downlink MIMO NOMA system over Nakagami-m fading, and propose two antenna-user selection methods considering two clusters of users having different priority levels. In contrast to the widely-used long data-packet assumption, the SPC analysis requires the redesign of the communication protocols and novel performance metrics. Given this context, we analyze the SPC performance of MIMO NOMA systems using the average block error rate (BLER) and minimum blocklength, instead of the conventional metrics such as ergodic capacity and outage capacity. More specifically, to characterize the system performance regarding SPC, asymptotic (in the high signal-to-noise ratio regime) and approximate closed-form expressions of the average BLER at the users are derived. Based on the asymptotic behavior of the average BLER, an analysis of the diversity order, minimum blocklength, and optimal power allocation is carried out. The achieved results show that MIMO NOMA can serve multiple users simultaneously using a smaller blocklength compared with MIMO OMA, thus demonstrating the benefits of MIMO NOMA for SPC in minimizing the transmission latency. Furthermore, our results indicate that the proposed methods not only improve the BLER performance, but also guarantee full diversity gains for the respective users. [less ▲]

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See detailLocal times and sample path properties of the Rosenblatt process
Kerchev, George UL; Nourdin, Ivan UL; Saksman, Eero et al

in Stochastic Processes and Their Applications (in press)

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See detailLimit theorems for integral functionals of Hermite-driven processes
Garino, Valentin UL; Nourdin, Ivan UL; Nualart, David et al

in Bernoulli (in press)

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See detailCarrier collaboration with endogenous networks: Or, the limits of what carrier collaboration can achieve under antitrust immunity
Mantin, Binyamin UL; Czerny, Achim; Jost, Peter et al

in Journal of Air Transport Management (in press)

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See detailUAV-Assisted Secure Communications in Terrestrial Cognitive Radio Networks: Joint Power Control and 3D Trajectory Optimization
Nguyen, X. Nguyen; Nguyen, van Dinh UL; Nguyen, Hieu V. et al

in IEEE Transactions on Vehicular Communications (in press)

This paper considers secure communications for an underlay cognitive radio network (CRN) in the presence of an external eavesdropper (Eve). The secrecy performance of CRNs is usually limited by the ... [more ▼]

This paper considers secure communications for an underlay cognitive radio network (CRN) in the presence of an external eavesdropper (Eve). The secrecy performance of CRNs is usually limited by the primary receiver’s interference power constraint. To overcome this issue, we propose to use an unmanned aerial vehicle (UAV) as a friendly jammer to interfere Eve in decoding the confidential message from the secondary transmitter (ST). Our goal is to jointly optimize the transmit power and UAV’s trajectory in the three-dimensional (3D) space to maximize the average achievable secrecy rate of the secondary system. The formulated optimization problem is nonconvex due to the nonconvexity of the objective and nonconvexity of constraints, which is very challenging to solve. To obtain a suboptimal but efficient solution to the problem, we first transform the original problem into a more tractable form and develop an iterative algorithm for its solution by leveraging the inner approximation framework. We further extend the proposed algorithm to the case of imperfect location information of Eve, where the average worst-case secrecy rate is considered as the objective function. Extensive numerical results are provided to demonstrate the merits of the proposed algorithms over existing approaches. [less ▲]

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See detailFast cross-validation for multi-penalty ridge regression
van de Wiel, Mark A.; van Nee, Mirrelijn M.; Rauschenberger, Armin UL

in Journal of Computational and Graphical Statistics (in press)

Prediction based on multiple high-dimensional data types needs to account for the potentially strong differences in predictive signal. Ridge regression is a simple, yet versatile and interpretable model ... [more ▼]

Prediction based on multiple high-dimensional data types needs to account for the potentially strong differences in predictive signal. Ridge regression is a simple, yet versatile and interpretable model for high-dimensional data that has challenged the predictive performance of many more complex models and learners, in particular in dense settings. Moreover, it allows using a specific penalty per data type to account for differences between those. Then, the largest challenge for multi-penalty ridge is to optimize these penalties efficiently in a cross-validation (CV) setting, in particular for GLM and Cox ridge regression, which require an additional loop for fitting the model by iterative weighted least squares (IWLS). Our main contribution is a computationally very efficient formula for the multi-penalty, sample-weighted hat-matrix, as used in the IWLS algorithm. As a result, nearly all computations are in the low-dimensional sample space. We show that our approach is several orders of magnitude faster than more naive ones. We developed a very flexible framework that includes prediction of several types of response, allows for unpenalized covariates, can optimize several performance criteria and implements repeated CV. Moreover, extensions to pair data types and to allow a preferential order of data types are included and illustrated on several cancer genomics survival prediction problems. The corresponding R-package, multiridge, serves as a versatile standalone tool, but also as a fast benchmark for other more complex models and multi-view learners. [less ▲]

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See detailRoboMAX: Robotic Mission Adaptation eXemplars
Askarpour, Mehrnoosh; Tsigkanos, Christos; Menghi, Claudio UL et al

in Symposium on Software Engineering for Adaptive and Self-Managing Systems (SEAMS) - Artifact Track (in press)

Emerging and future applications of robotic systems pose unique self-adaptation challenges. To support the research needed to address these challenges, we provide an extensible repository of robotic ... [more ▼]

Emerging and future applications of robotic systems pose unique self-adaptation challenges. To support the research needed to address these challenges, we provide an extensible repository of robotic mission adaptation exemplars. Co-designed with robotic application stakeholders including researchers, developers, operators, and end-users, our repository captures key sources of uncertainty, adaptation concerns, and other distinguishing characteristics of such applications. An online form enables external parties to supply new exemplars for curation and inclusion into the repository. We envisage that our RoboMAX repository will enable the development, evaluation, and comparison of much-needed self-adaptation approaches for the robotic systems domain. [less ▲]

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See detailEnergy Efficiency Maximization in RIS-Aided Cell-Free Network with Limited Backhaul
Le, Nhat Le; Nguyen, van Dinh UL; Dobre, Octavia A. et al

in IEEE Communications Letters (in press)

Integrating the reconfigurable intelligent surface in a cell-free (RIS-CF) network is an effective solution to improve the capacity and coverage of future wireless systems with low cost and power ... [more ▼]

Integrating the reconfigurable intelligent surface in a cell-free (RIS-CF) network is an effective solution to improve the capacity and coverage of future wireless systems with low cost and power consumption. The reflecting coefficients of RISs can be programmed to enhance signals received at users. This letter addresses a joint design of transmit beamformers at access points and reflecting coefficients at RISs to maximize the energy efficiency (EE) of RIS-CF networks, taking into account the limited backhaul capacity constraints. Due to a very computationally challenging nonconvex problem, we develop a simple yet efficient alternating descent algorithm for its solution. Numerical results verify that the EE of RIS-CF networks is greatly improved, showing the benefit of using RISs. [less ▲]

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See detailPublic family firms and capital structure: A meta-analysis
Hansen, Christopher UL; Block, Joern

in Corporate Governance: An International Review (in press)

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See detailWhy flipping the classroom is not enough: Digital curriculum making after the pandemic
Backes, Susanne UL; Baumann, Isabell Eva UL; Harion, Dominic UL et al

in PROSPECTS Comparative Journal of Curriculum, Learning, and Assessment (in press)

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See detailOn Systematically Building a Controlled Natural Language for Functional Requirements
Veizaga Campero, Alvaro Mario UL; Alferez, Mauricio UL; Torre, Damiano UL et al

in Empirical Software Engineering (in press)

[Context] Natural language (NL) is pervasive in software requirements specifications (SRSs). However, despite its popularity and widespread use, NL is highly prone to quality issues such as vagueness ... [more ▼]

[Context] Natural language (NL) is pervasive in software requirements specifications (SRSs). However, despite its popularity and widespread use, NL is highly prone to quality issues such as vagueness, ambiguity, and incompleteness. Controlled natural languages (CNLs) have been proposed as a way to prevent quality problems in requirements documents, while maintaining the flexibility to write and communicate requirements in an intuitive and universally understood manner. [Objective] In collaboration with an industrial partner from the financial domain, we systematically develop and evaluate a CNL, named Rimay, intended at helping analysts write functional requirements. [Method] We rely on Grounded Theory for building Rimay and follow well-known guidelines for conducting and reporting industrial case study research. [Results] Our main contributions are: (1) a qualitative methodology to systematically define a CNL for functional requirements; this methodology is intended to be general for use across information-system domains, (2) a CNL grammar to represent functional requirements; this grammar is derived from our experience in the financial domain, but should be applicable, possibly with adaptations, to other information-system domains, and (3) an empirical evaluation of our CNL (Rimay) through an industrial case study. Our contributions draw on 15 representative SRSs, collectively containing 3215 NL requirements statements from the financial domain. [Conclusion] Our evaluation shows that Rimay is expressive enough to capture, on average, 88% (405 out of 460) of the NL requirements statements in four previously unseen SRSs from the financial domain. [less ▲]

Detailed reference viewed: 263 (27 UL)