![]() Ortiz Gomez, Flor de Guadalupe ![]() ![]() ![]() in Towards the Application of Neuromorphic Computing to Satellite Communications (2022, October) Artificial intelligence (AI) has recently received significant attention as a key enabler for future 5G-and-beyond terrestrial wireless networks. The applications of AI to satellite communications is also ... [more ▼] Artificial intelligence (AI) has recently received significant attention as a key enabler for future 5G-and-beyond terrestrial wireless networks. The applications of AI to satellite communications is also gaining momentum to realize a more autonomous operation with reduced requirements in terms of human intervention. The adoption of AI for satellite communications will set new requirements on computing processors, which will need to support large workloads as efficiently as possible under harsh environmental conditions. In this context, neuromorphic processing (NP) is emerging as a bio-inspired solution to address pattern recognition tasks involving multiple, possibly unstructured, temporal signals and/or requiring continual learning. The key merits of the technology are energy efficiency and capacity for on-device adaptation. In this paper, we highlight potential use cases and applications of NP to satellite communications. We also explore major technical challenges for the implementation of space-based NP focusing on the available NP chipsets. [less ▲] Detailed reference viewed: 239 (32 UL)![]() Lehnert, Thorsten ![]() Scientific Conference (2022, October) Detailed reference viewed: 6 (1 UL)![]() Nurunnabi, Abdul Awal Md ![]() ![]() in kCV-B: Bootstrap with Cross-Validation for Deep Learning Model Development, Assessment and Selection (2022, October) This study investigates the inability of two popular data splitting techniques: train/test split and k-fold cross-validation that are to create training and validation data sets, and to achieve sufficient ... [more ▼] This study investigates the inability of two popular data splitting techniques: train/test split and k-fold cross-validation that are to create training and validation data sets, and to achieve sufficient generality for supervised deep learning (DL) methods. This failure is mainly caused by their limited ability of new data creation. In response, the bootstrap is a computer based statistical resampling method that has been used efficiently for estimating the distribution of a sample estimator and to assess a model without having knowledge about the population. This paper couples cross-validation and bootstrap to have their respective advantages in view of data generation strategy and to achieve better generalization of a DL model. This paper contributes by: (i) developing an algorithm for better selection of training and validation data sets, (ii) exploring the potential of bootstrap for drawing statistical inference on the necessary performance metrics (e.g., mean square error), and (iii) introducing a method that can assess and improve the efficiency of a DL model. The proposed method is applied for semantic segmentation and is demonstrated via a DL based classification algorithm, PointNet, through aerial laser scanning point cloud data. [less ▲] Detailed reference viewed: 52 (4 UL)![]() Kumar, Sumit ![]() ![]() ![]() in IEEE Future Networks World Forum (2022, October) Technical advancements and experimental works for the integration of 5G and Non-Terrestrial Networks (NTN) have gained significant traction over the past few years. NTN components have been officially ... [more ▼] Technical advancements and experimental works for the integration of 5G and Non-Terrestrial Networks (NTN) have gained significant traction over the past few years. NTN components have been officially included in the 5G ecosystem by 3GPP in the latest Release-17. 5G-NTN research is ongoing and it is desirable to have a platform that facilitates quick prototyping of the proof-of-concept methods. OpenAirInterface(OAI) is an open-source experimental yet 3GPP standard-compliant Software Defined Radio (SDR) based protocol stack that has been widely known for implementing 4G/5G technologies. Due to its proven capabilities and flexibility, OAI is currently in the developmental process of integrating adaptations for the 5G-NTN. In this work, we discuss the peculiar features of OAI which are shaping it towards becoming a preferred tool for research and experimentation related to 5G-NTN. We provide details of completed/ongoing 5G-NTN projects leveraging OAI to achieve their objectives. In particular, we discuss 5G-GOA and 5G-LEO where critical adaptations in OAI are being done to support 5G-NTN usecases. Such adaptations enable direct-access between UE and gNB via transparent payload Geostationary (5G-GOA) and Nongeostationary satellites (5G-LEO). Both projects have closely followed 3GPP discussions over 5G-NTN and the adaptations are compliant with the currently frozen 3GPP Release-17. OAI adaptations from both projects will be merged into the main development branch of OAI. We also provide a future roadmap of OAI towards 5G-NTN development. We believe that the pioneering steps taken in the course of the aforementioned projects will establish OAI as a preferred tool for 5G-NTN research and experimentations. [less ▲] Detailed reference viewed: 57 (10 UL)![]() Kirsch, Claudine ![]() Scientific Conference (2022, September 29) Detailed reference viewed: 33 (2 UL)![]() ; ; et al Scientific Conference (2022, September 29) The emerging concept of digital twins is the key enabler for modelling and simulations needs of any future-ready entity. Digital twins enable rapid transformation of requirements into capabilities at much ... [more ▼] The emerging concept of digital twins is the key enabler for modelling and simulations needs of any future-ready entity. Digital twins enable rapid transformation of requirements into capabilities at much lower costs, compared to conventional methods, through enhancement of modularity and scalability. Elements of a modelling and simulations digital twin are discussed in this paper. These capabilities include, but are not limited to, surrogate modelling, optimization, parallelization, high performance computing, cloud architecture design, etc. These concepts are relevant for the integration of modelling and simulations technologies into a single interface digital twin for rapid prototyping and qualification of engineering systems. Use of these emerging technologies leads to significantly less simulation computation time (reduced from hours/days to seconds or even micro-seconds) compared to the conventional methods. Ease-of-collaboration with all stakeholders, reduced testing time, minimal on-site infrastructure requirements are the key cost-reducing advantages found in this study. Applicability of such intelligent and online digital twins for information superiority to enhance cybersecurity and on-board threat assessment of space-based (defence) services is analysed. The use of these synchronized and interoperable capabilities mitigates both reversible and non-reversible physical and cyber threats to defence space infrastructure. [less ▲] Detailed reference viewed: 118 (23 UL)![]() Ebrahimi, Ehsan ![]() ![]() in Post-quantum Plaintext-awareness (2022, September 28) Detailed reference viewed: 38 (27 UL)![]() Souani, Badr ![]() ![]() ![]() in Jianying, Zhou (Ed.) Applied Cryptography and Network Security Workshops (2022, September 24) In this paper, we propose two empirical studies to (1) detect Android malware and (2) classify Android malware into families. We rst (1) reproduce the results of MalBERT using BERT models learning with ... [more ▼] In this paper, we propose two empirical studies to (1) detect Android malware and (2) classify Android malware into families. We rst (1) reproduce the results of MalBERT using BERT models learning with Android application's manifests obtained from 265k applications (vs. 22k for MalBERT) from the AndroZoo dataset in order to detect malware. The results of the MalBERT paper are excellent and hard to believe as a manifest only roughly represents an application, we therefore try to answer the following questions in this paper. Are the experiments from MalBERT reproducible? How important are Permissions for mal- ware detection? Is it possible to keep or improve the results by reducing the size of the manifests? We then (2) investigate if BERT can be used to classify Android malware into families. The results show that BERT can successfully di erentiate malware/goodware with 97% accuracy. Further- more BERT can classify malware families with 93% accuracy. We also demonstrate that Android permissions are not what allows BERT to successfully classify and even that it does not actually need it. [less ▲] Detailed reference viewed: 53 (3 UL)![]() Lejot, Eve ![]() Scientific Conference (2022, September 24) Multilingual teaching and the promotion of multilingualism among students are important principles of the University of Luxembourg. For their implementation, a variety of e-learning resources are used ... [more ▼] Multilingual teaching and the promotion of multilingualism among students are important principles of the University of Luxembourg. For their implementation, a variety of e-learning resources are used, adapted to the needs of the learners. We will give an overview of new multimodal communication practices and methods used by learners in multilingual contexts which naturally lead teachers to rethink their approach and incorporate media into their teaching strategies. The hybrid nature of devices (computers, tablets, televisions, smartphones, paper, interactive whiteboards, etc.) and digital tools (document sharing platforms, online correction tools, interactive exercises, online learning programmes, dictionaries, video editing software, automatic pronunciation correction, etc.) offer a great potential to interactive and mobile teaching and learning. We will illustrate this potential by giving an example of how to develop text production competence in Chinese as a foreign language in a motivating way using the content management system Moodle. Our reflection aims at optimising the quality of language teaching both in and out of the classroom. [less ▲] Detailed reference viewed: 45 (3 UL)![]() Graczyk, Rafal ![]() ![]() ![]() in Graczyk, Rafal; Memon, Md Saad; Volp, Marcus (Eds.) IAC 2022 congress proceedings, 73rd International Astronautical Congress (IAC) (2022, September 21) Future space exploration and exploitation missions will require significantly increased autonomy of operation for mission planning, decision-making, and adaptive control techniques. Spacecrafts will ... [more ▼] Future space exploration and exploitation missions will require significantly increased autonomy of operation for mission planning, decision-making, and adaptive control techniques. Spacecrafts will integrate new processing and compression algorithms that are often augmented with machine learning and artificial intelligence capabilities. This functionality will have to be provided with high levels of robustness, reliability, and dependability for conducting missions successfully. High-reliability requirements for space-grade processors have led to trade-offs in terms of costs, energy efficiency, and performance to obtain robustness. However, while high-performance / low-robustness configurations are acceptable in the Earth's vicinity, where assets remain protected by the planet's magnetosphere, they cease to work in more demanding environments, like cis-lunar or deep space, where high-energy particles will affect modern components heavily, causing temporary or permanent damage and ultimately system failures. The above has led to a situation where state-of-the-art processing elements (processors, co-processors, memories, special purpose accelerators, and field-programmable-gate arrays (FPGAs), all possibly integrated into System-on-a-Chip (SoC) designs) are superior to their high reliability, space-qualified counterparts in terms of processing power or energy efficiency. For example, from modern, state-of-the-art (SOTA) devices, one can expect a 2-3 order-of-magnitude performance per Watts improvement over space-grade equipment. Likewise, one finds a gap of approximately nine technology nodes between devices, which translates into a factor 25 decrease in operations per Watts. In this paper, we demonstrate how to utilize part of this enormous performance advantage to increase the robustness and resilience of otherwise susceptible semiconductor devices while harnessing the remaining processing power to build affordable space systems capable of hosting the compute-intensive functionality that future space missions require. We are bridging this performance-reliability gap by researching the enabling building blocks for constructing reliable and secure, space-ready Systems-on-a-Chip from SOTA processing elements. [less ▲] Detailed reference viewed: 101 (26 UL)![]() Alandihallaj, Mohammadamin ![]() Scientific Conference (2022, September 20) The paper discusses the deployment of multiple-payload fractionated spacecraft as a surveillance system for autonomously monitoring and detecting wildfires at early stages in any area on the Earth’s ... [more ▼] The paper discusses the deployment of multiple-payload fractionated spacecraft as a surveillance system for autonomously monitoring and detecting wildfires at early stages in any area on the Earth’s surface. The fractionated system, consisting of 12 operational CubeSats, four reserved CubeSats, and one Mothership, acquires images in 13 spectral bands within the visible, near infrared, and short-wave infrared regions with high spatial resolutions. A dynamic fire-hazard index is introduced, based on geographic coordinates, environmental parameters, and weather conditions, to prioritize the areas for the probability of wildfires. Then, a convolutional neural network is designed to identify potentially hazardous areas and detect the early stages of wildfire spots. The detection method is based on the processed images and geographic locations as well as measurements of thermal anomalies, smoke, and unusual variations of regional atmospheric conditions. The effectiveness of the surveillance system is examined through several case studies using numerical simulations. [less ▲] Detailed reference viewed: 34 (7 UL)![]() Muralidharan, Vivek ![]() ![]() ![]() Scientific Conference (2022, September 20) Space missions to Near Rectilinear Halo Orbits (NRHOs) in the Earth-Moon system are upcoming. A rendezvous technique in the cislunar space is proposed in this investigation, one that leverages coupled ... [more ▼] Space missions to Near Rectilinear Halo Orbits (NRHOs) in the Earth-Moon system are upcoming. A rendezvous technique in the cislunar space is proposed in this investigation, one that leverages coupled orbit and attitude dynamics in the Circular Restricted Three-body Problem (CR3BP). An autonomous Guidance, Navigation and Control (GNC) technique is demonstrated in which a chaser spacecraft approaches a target spacecraft in the southern 9:2 synodic-resonant L2 Near Rectilinear Halo Orbit (NRHO), one that currently serves as the baseline for NASA's Gateway. A two-layer control approach is contemplated. First, a nonlinear optimal controller identifies an appropriate baseline rendezvous path, both in position and orientation. As the spacecraft progresses along the pre-computed baseline path, optical sensors measure the relative pose of the chaser relative to the target. A Kalman filter processes these observations and offers precise state estimates. A linear controller compensates for any deviations identified from the predetermined rendezvous path. The efficacy of the GNC technique is tested by considering a complex scenario in which the rendezvous operation is conducted with a non-cooperative tumbling target. Hardware-in-the-loop laboratory experiments are conducted as proof-of-concept to validate the guidance algorithm, with observations supplemented by optical navigation techniques. [less ▲] Detailed reference viewed: 169 (53 UL)![]() Vega Moreno, Carlos Gonzalo ![]() ![]() Poster (2022, September 20) Longitudinal clinical research studies require conducting various assessments over long periods of time. Such assessments comprise numerous stages, requiring different resources defined by ... [more ▼] Longitudinal clinical research studies require conducting various assessments over long periods of time. Such assessments comprise numerous stages, requiring different resources defined by multidisciplinary research staff and aligned with available infrastructure and equipment, altogether constrained by time. While it is possible to manage the allocation of resources manually, it is complex and error-prone. Efficient multi-appointment scheduling is essential to assist clinical teams, ensuring high participant retention and producing successful clinical studies, directly impacting patient throughput and satisfaction. We present Smart Scheduling (SMASCH) system [1], a web application for multi-appointment scheduling management aiming to reduce times, optimise resources and secure personal identifiable information. SMASCH facilitates clinical research and integrated care programs in Luxembourg, providing features to better manage multi-appointment scheduling problems (MASPs) characteristic of longitudinal clinical research studies and speed up management tasks. It is present in multiple clinical research and integrated care programs in Luxembourg since 2017, including Dementia Prevention Program, the study for Mild Cognitive Impairment and gut microbiome, and the National Centre of Excellence in Research on Parkinson’s disease [2] which encompasses the study for REM sleep behaviour disorder and the Luxembourg Parkinson’s Study. SMASCH is a free and open-source solution available both as a Linux package and Docker image. [less ▲] Detailed reference viewed: 52 (2 UL)![]() Gómez de Lope, Elisa ![]() ![]() Poster (2022, September 18) Background: Despite the increasing prevalence of Parkinson’s Disease (PD) and research efforts to understand its underlying molecular pathogenesis, early diagnosis of PD remains a challenge. Machine ... [more ▼] Background: Despite the increasing prevalence of Parkinson’s Disease (PD) and research efforts to understand its underlying molecular pathogenesis, early diagnosis of PD remains a challenge. Machine learning analysis of blood-based omics data is a promising non-invasive approach to finding molecular fingerprints associated with PD that may enable an early and accurate diagnosis. Description: We applied several machine learning classification methods to public omics data from PD case/control studies. We used aggregation statistics and Pathifier’s pathway deregulation scores to generate higher order functional representations of the data such as pathway-level features. The models’ performance and most relevant predictive features were compared with individual feature level predictors. The resulting diagnostic models from individual features and Pathifier’s pathway deregulation scores achieve significant Area Under the Curve (AUC, a receiver operating characteristic curve) scores for both cross-validation and external testing. Furthermore, we identify plausible biological pathways associated with PD diagnosis. Conclusions: We have successfully built machine learning models at pathway-level and single-feature level to study blood-based omics data for PD diagnosis. Plausible biological pathway associations were identified. Furthermore, we show that pathway deregulation scores can serve as robust and biologically interpretable predictors for PD. [less ▲] Detailed reference viewed: 152 (8 UL)![]() Uhrmacher, Martin ![]() Scientific Conference (2022, September 16) The capital of the Grand Duchy of Luxembourg is one of the three official seats of the EU, alongside Brussels and Strasbourg. Over the past 40 years, both the Grand Duchy and its capital city have ... [more ▼] The capital of the Grand Duchy of Luxembourg is one of the three official seats of the EU, alongside Brussels and Strasbourg. Over the past 40 years, both the Grand Duchy and its capital city have undergone a remarkable trajectory of growth and change. One of the major sites implicated in this economic success is the Plateau de Kirchberg, a 365-hectares area that now hosts the European and banking district as well as some components of nationally important infrastructure (for example the National Library, Philharmonic Hall and many others). Initially agricultural land, the Kirchberg was developed by the central government from the early 1960s. It was then mainly designed in the fashion of a modern office town, with high-rises, starchitecture and wide boulevards. With its emblematic appeal of modern town planning, Kirchberg presents a huge contrast to the old city wiith its more than thousand years of history on the opposite side of the deep-cut Alzette valley. But can we see a divided city here? Is it not rather an urban extension, though large and of international significance, comparable to areas such as La Défense in Paris or the London Docklands? The thesis is pursued as to whether the Kirchberg district can be seen, de facto, as a second city. [less ▲] Detailed reference viewed: 45 (1 UL)![]() ![]() Wealer, Cyril ![]() ![]() ![]() Scientific Conference (2022, September 16) Detailed reference viewed: 66 (10 UL)![]() Rivas, Salvador ![]() ![]() ![]() Scientific Conference (2022, September 15) INTRODUCTION Team-teaching, also known as collaborative-teaching, co-teaching and pair-lecturing has been practiced for ages (Buckley 2000). It is generally described as a positive pedagogical practice ... [more ▼] INTRODUCTION Team-teaching, also known as collaborative-teaching, co-teaching and pair-lecturing has been practiced for ages (Buckley 2000). It is generally described as a positive pedagogical practice that can both enhance learning among students and the experience of teaching among instructors (Plank 2011, 2014). While it is acknowledged that team-teaching is not simple and requires great coordination among instructors, it is presented in gleaming terms for both instructors and students alike. More recent work highlights an increased necessity for collaborative-teaching due to the growing complexity in higher education combined with dwindling resources (Minett-Smith and Davis 2020), or as a deliberate cost-saving measure (Liebel et al. 2017). Yet, little quantitative evidence can be found in the literature showing the positive efficacy of this methodology, relative to Student Evaluation Teaching (SET) measures (for exception see: Carpenter et al. 2007). Thus, this study aims to answer: 1) how prevalent is team-teaching; 2) what are the most common team compositions (number of instructors, gender, instructor status and seniority); 3) are there any significant differences in SET scores relative to differences in composition; and 4) what can we learn from the open-text feedback to help us understand, or contextualize, any quantitative differences found between solo- versus team-taught courses? DATA & METHODS To address our research questions and investigate the contours of team teaching in the Faculty of Humanities, Education and Social Sciences (FHSE) at the University of Luxembourg, we use SET data (course feedback), as an indirect measure of quality of education (Marsh 2007). We use descriptive statistics and regression analysis to examine the quantitative feedback for a total of 2908 courses collected over eight semesters (Winter semester 2015-Summer semester 2019). We compliment these results with content analysis of open-text comments that help us understand and contextualize the quantitative findings. PRELIMINARY RESULTS While course feedback data does not directly measure the quality of learning experienced by students (i.e., whether students learn better in team-taught courses vs. solo instructor courses), it does however shed light on the general sentiment experienced and reported by participating students. Preliminary analyses indicate that approximately 30% of courses are team-taught (60% with two-person teams and 40% with teams of 3 and 4+ instructors). Furthermore, we found that, on average, team-taught courses receive significantly lower ratings from students than solo instructor courses. In the remainder of this article, we analyse this basic finding and discuss the implications for team teaching. [less ▲] Detailed reference viewed: 39 (8 UL)![]() ![]() Krebs, Stefan ![]() Scientific Conference (2022, September 15) In der Technikgeschichte wird oftmals angenommen, dass die industrielle Massenfertigung und die Herausbildung der so genannten Wegwerfgesellschaft zu einem Rückgang bzw. Verschwinden des Reparierens von ... [more ▼] In der Technikgeschichte wird oftmals angenommen, dass die industrielle Massenfertigung und die Herausbildung der so genannten Wegwerfgesellschaft zu einem Rückgang bzw. Verschwinden des Reparierens von Konsumgütern geführt haben. In „Shock of the Old“ spricht David Edgerton z.B. davon, dass sich aufgrund der gesunkenen Anschaffungspreise, das Reparieren einfacher Haushaltsgeräte nicht mehr lohne. Das Hauptargument dieser These verweist also auf das sich seit der Vormoderne wandelnde Verhältnis von Personal- und Materialkosten, das letztlich den Neuerwerb von Konsumgütern günstiger gemacht habe, als die Reparatur gebrauchter Güter. Während der Begriff der Wegwerfgesellschaft bis in die 1950er Jahre zurückreicht, werden für westliche Industriegesellschaften vor allem die 1970er und 80er Jahre als Wendepunkte im Verhältnis von Neuanschaffungs- zu Reparaturkosten beschrieben. Ausgangspunkt für den Vortrag sind Zahlen der Luxemburger Statistikbehörde Statec, die zeigen, dass der Reparatursektor in Luxemburg in den 1980er Jahren einerseits zwar in Bewegung, andererseits keineswegs im Verschwinden war. Ausgehend von einer eingehenderen Betrachtung der verfügbaren Statistiken beschreibt der Vortrag die Veränderungen des Luxemburger Reparatursektors und diskutiert daran die These des vermeintlichen Verschwindens des Reparierens von Konsumgütern. [less ▲] Detailed reference viewed: 55 (0 UL)![]() Harnoncourt, Julia ![]() Scientific Conference (2022, September 15) Detailed reference viewed: 10 (1 UL)![]() Wealer, Cyril ![]() ![]() ![]() Scientific Conference (2022, September 15) Detailed reference viewed: 60 (10 UL)![]() Clavert, Frédéric ![]() Scientific Conference (2022, September 15) Detailed reference viewed: 24 (1 UL)![]() Noel, Cédric ![]() ![]() Scientific Conference (2022, September 14) Detailed reference viewed: 27 (2 UL)![]() Bersweiler, Mathias ![]() Scientific Conference (2022, September 13) Detailed reference viewed: 22 (0 UL)![]() ; ; et al Scientific Conference (2022, September 12) Visualising abstract concepts such as for example geometrical objects in mathematics can be a valuable support for learners. Visualisation, however, is a process involving several steps that influence ... [more ▼] Visualising abstract concepts such as for example geometrical objects in mathematics can be a valuable support for learners. Visualisation, however, is a process involving several steps that influence each other. Duval (1998) uses steps connecting reasoning by an explanation or proof to a construction step involving tools creating a visualisation to a production of a visual representation leading to new insights about a geometrical object. Vágová (2020) argues that visualising geometrical objects needs the ability to create, manipulate, and transform mental images by an internal and an external representation which both require information about the spatial arrangement. 3D modelled and then visualised geometrical objects can support the development and train visualisation skills. Steps of visualisation processes require visuospatial competencies and are also important for other subjects in Science, Technology, Engineering, Arts and Mathematics (STEAM) education (Ng 2017). Being able to understand representations and their spatial rotations, transitions between 2D and 3D and being able to manipulate representations are valuable for STEAM related subjects (Kok 2020). Martin-Dorta et al. (2008) says that spatial abilities can be improved using real and computer-aided models. 3D printing can therefore be an interesting activity as it also combines the mentioned steps in a mathematical modelling way. This approach was used in a beginners course for pre-service mathematics teachers and some of them chose to create mathematical proofs as visualisation. We will look at 3D printed objects, which concepts they visualise and what teachers' ideas behind visualisations were. [less ▲] Detailed reference viewed: 62 (10 UL)![]() Kozlowski, Diego ![]() in BRIDGES BETWEEN DISCIPLINES: GENDER IN STEM AND SOCIAL SCIENCES (2022, September 12) Detailed reference viewed: 99 (6 UL)![]() Deregnoncourt, Marine ![]() Scientific Conference (2022, September 09) Nous entendons nous intéresser à la rencontre qui s’est déroulée, le lundi 7 mars 2022 à 20h au cinéma Mk2 Nation (Paris, 12ème), entre la mettrice en scène brésilienne, Christiane Jatahy, la philosophe ... [more ▼] Nous entendons nous intéresser à la rencontre qui s’est déroulée, le lundi 7 mars 2022 à 20h au cinéma Mk2 Nation (Paris, 12ème), entre la mettrice en scène brésilienne, Christiane Jatahy, la philosophe Marylin Maeso, autrice de La petite fabrique de l’inhumain et la psychanalyste Clotilde Leguil, venant de publier Céder n’est pas consentir. Cet échange fut dédié à Entre chien et loup, dernier spectacle en date, voulu par l’artiste carioca précitée — à la notoriété grandissante en Europe depuis près de vingt ans — d’après le scénario du film de Lars von Trier : Dogville avec Nicole Kidman dans le rôle-titre de Grace. Cet événement liminaire nous servira à démontrer, à terme, combien cette création se révèle être un théâtre éminemment ancré dans le présent, témoignant de toutes les formes contemporaines de fascisme, par le truchement, précisément, du personnage de Grace, devenu, pour les besoins de la mise en scène, Gracia, jeune femme d’origine brésilienne, interprétée par Julia Bernat, actrice fétiche de Christiane Jatahy grâce à laquelle elle peut faire pleinement entendre sa propre voix d’artiste politiquement engagée. [less ▲] Detailed reference viewed: 25 (0 UL)![]() ![]() Kozlowski, Diego ![]() Poster (2022, September 08) Detailed reference viewed: 36 (2 UL)![]() Bahmani, Ramin ![]() ![]() ![]() in Energy Informatics (2022, September 07), 5 The energy transition into a modern power system requires energy flexibility. Demand Response (DR) is one promising option for providing this flexibility. With the highest share of final energy ... [more ▼] The energy transition into a modern power system requires energy flexibility. Demand Response (DR) is one promising option for providing this flexibility. With the highest share of final energy consumption, the industry has the potential to offer DR and contribute to the energy transition by adjusting its energy demand. This paper proposes a mathematical optimization model that uses a generic data model for flexibility description. The optimization model supports industrial companies to select when (i.e., at which time), where (i.e., in which market), and how (i.e., the schedule) they should market their flexibility potential to optimize profit. We evaluate the optimization model under several synthetic use cases developed upon the learnings over several workshops and bilateral discussions with industrial partners from the paper and aluminum industry. The results of the optimization model evaluation suggest the model can fulfill its purpose under different use cases even with complex use cases such as various loads and storages. However, the optimization model computation time grows as the complexity of use cases grows. [less ▲] Detailed reference viewed: 65 (20 UL)![]() Kozlowski, Diego ![]() Scientific Conference (2022, September 07) Detailed reference viewed: 24 (3 UL)![]() ; Poiger, Wolfgang ![]() ![]() Scientific Conference (2022, September 07) Detailed reference viewed: 45 (1 UL)![]() Potenciano Menci, Sergio ![]() in Energy Informatics (2022, September 07), 5 Flexibility has risen as a potential solution and complement for system operators’ current and future problems (e.g., congestion, voltage) caused by integrating distributed renewable resources (e.g., wind ... [more ▼] Flexibility has risen as a potential solution and complement for system operators’ current and future problems (e.g., congestion, voltage) caused by integrating distributed renewable resources (e.g., wind, solar) and electric vehicles. In parallel, local flexibility markets (LFM) emerge as a possible smart grid solution to bridge between flexibility-seeking customers and flexibility-offering customers in localized areas. Nevertheless, there is no unique, standard, or simple solution to tackle all the problems system operators and other energy actors face. Therefore, many local flexibility market concepts, initiatives (projects), and companies have developed various solutions over the last few years. At the same time, they increased the complexity of the topic. Thus, this research paper aims to describe several local flexibility market concepts, initiatives (projects), and companies in Europe. To do so, we propose a taxonomy derived from LFMs descriptions. We use the taxonomy-building research method proposed by [1] to develop our taxonomy. Moreover, we use the smart grid architecture model (SGAM) as a structural and foundation guideline. Given the numerous and diverse LFM solutions, we delimit the taxonomy by considering solutions focused on congestion management on medium and low voltage (meta-characteristic). [less ▲] Detailed reference viewed: 86 (11 UL)![]() Aleksic, Gabrijela ![]() Scientific Conference (2022, September 07) Luxembourg is a highly linguistically and culturally diverse country. In early education, there are 64 % of four-year old children who not speak Luxembourgish at home (MENJE, 2018). From 2017 ... [more ▼] Luxembourg is a highly linguistically and culturally diverse country. In early education, there are 64 % of four-year old children who not speak Luxembourgish at home (MENJE, 2018). From 2017, multilingual early education is mandatory, which obliges teachers to develop children’s Luxembourgish, familiarizing them with French, and valuing their home languages. Therefore, the present project aimed to: (1) offer an 18-hours professional development (PD) course in translanguaging pedagogy to 40 teachers over 6 months, (2) strengthen home-school collaboration, and (3) support children’s linguistic, socio-emotional, and cognitive development and engagement in the classroom. The results from teacher questionnaires, focus groups, and interviews, showed that there was some positive change regarding the attitudes towards children’s home languages. The interviews with 17 parents indicated that there was a need for more home-school collaboration. The tests in early literacy and numeracy with 23 preschool children over one year, identified that children performed higher in their home languages. The video observations showed that when the teachers used children’s languages in the classroom, this impacted positively their well-being. Following the principles of creative activism, the author produced: (1) the website with over 100 practical activities on how teachers can involve children’s languages and families, (2) the illustrated book Sumak for parents, showing difficulties with integration in a new country, and (3) the illustrated book, Mara’s song for preschool children, showing how Mara finds her way in the new classroom. [less ▲] Detailed reference viewed: 49 (0 UL)![]() Sagrillo, Damien François ![]() Scientific Conference (2022, September 06) Im Jahr 1789 hat Luxemburg als selbstständiger und unabhängiger Staat noch nicht existiert. Es bedurfte des Wiener Kongresses (1815) und der belgischen Revolution (1830), um aus Luxemburg ein souveräner ... [more ▼] Im Jahr 1789 hat Luxemburg als selbstständiger und unabhängiger Staat noch nicht existiert. Es bedurfte des Wiener Kongresses (1815) und der belgischen Revolution (1830), um aus Luxemburg ein souveräner Staat werden zu lassen. Bürgerliche Freiheiten wurden den Luxemburgern allerdings erst unter König-Großherzog Wilhelm II zugestanden. Mit dem Versammlungsrecht wurde der Bevölkerung auch das Vereinigungsrecht gewährt. Das Jahr 1848 bedeutet den Startpunkt und eine erste Wegmarke im Werden der Laienmusik im Großherzogtum. Im Jahr 1940 kam es mit der deutschen Besetzung zu einem abrupten Bruch einer Freiheit, die den Luxemburgern in fast einem Jahrhundert in Fleisch und Blut übergegangen zu sein schien. Der Neubeginn ab dem Jahr 1944 bedeutete eine weitere Wegmarke im Sinne von kultureller Betätigung in einer freiheitlichen Grundordnung. Im Diskurs um weitere Wegmarken sind keine politische, sondern eher soziale, pädagogische und technologische Umwälzungen ins Visier zu nehmen. [less ▲] Detailed reference viewed: 29 (4 UL)![]() Magni, Stefano ![]() ![]() Scientific Conference (2022, September 05) Objectives. Gait impairments in patients with Parkinson’s disease (PD) and normal pressure hydrocephalus (NPH) are visually assessed by movement disorders experts for diagnoses and to decide on ... [more ▼] Objectives. Gait impairments in patients with Parkinson’s disease (PD) and normal pressure hydrocephalus (NPH) are visually assessed by movement disorders experts for diagnoses and to decide on pharmaceutical and surgical interventions. Despite standardised tests and clinicians’ expertise, such approaches entail a considerable level of subjectivity. The recent development of wearable sensors and machine learning offers complementary approaches providing more objective, quantitative assessments of gait impairments. We aim to employ the data gathered from an inertial measurement unit synchronized with a novel foot pressure sensor embedded in the patient’s shoes to characterize gait impairments. We focus on distinguishing PD from NPH and on assessing gait impairment before and after surgical intervention. Methods. A cohort of 10 PD and 10 NPH patients was assembled and patients performed standardised walking tests. Measurements were performed employing wearable sensors comprising a three-axes gyroscope, a three-axes accelerometer and eight pressure sensors embedded in each patient’s shoe. To analyse the generated data, existing algorithms were implemented and adapted. These allow to compute gait cycle parameters such as step time and metrics characterizing the swing and stance phases. Machine learning algorithms where employed to identify major changes in gait cycle parameters between the two groups of patients, and for individual patients before and after surgical intervention as DBS implantation in PD and Shunt implantation in NPH. Results. The gait impairments of both disease groups were measured and quantified. An algorithm to extract gait cycle parameters from sensors was implemented, tested and employed on such patients. Gait cycle parameters within and between the groups of PD and NPH patients were compared, assessing what gait cycle parameters allow to distinguish between these groups. Gait cycle impairments of patients before and after surgery were compared, assessing the effect of DBS or Shunt implantation and which gait cycle parameters allow to monitor symptoms improvement. Conclusions. Wearable sensors measuring pressure, combined with gait cycle parameters extraction and machine learning algorithms, have a great potential for objective evaluation of gait impairment. In particular, they allow to characterize what differentiate such impairments between PD and NPH patients, and what allow to assess motor symptoms improvement after surgery. [less ▲] Detailed reference viewed: 93 (8 UL)![]() ; Goncalinho Poeira, Ricardo Jorge ![]() in 17TH INTERNATIONAL CONFERENCE ON CONCENTRATOR PHOTOVOLTAIC SYSTEMS (CPV-17) (2022, September 02) Cu(In,Ga)Se2 solar cells have reached a record efficiency of 23.35% and are established as a renewable energy technology. However, future large-scale fabrication might be hindered by the availability and ... [more ▼] Cu(In,Ga)Se2 solar cells have reached a record efficiency of 23.35% and are established as a renewable energy technology. However, future large-scale fabrication might be hindered by the availability and high cost of raw materials. To reduce the amount of solar cell material, strong efforts have been devoted to the development of the micro-concentrator photovoltaics concept for Cu(In,Ga)Se2 thin film solar cells, which combines the well established concentrator photovoltaics (CPV) technology with the miniaturization of the solar cells. In this work, we review different bottom-up approaches for the fabrication of Cu(In,Ga)Se2 micro solar cells, that potentially allow the reduction of raw material, and we present the latest results on a magnetron sputtering based method for Cu(In,Ga)Se2 micro solar cells. [less ▲] Detailed reference viewed: 96 (6 UL)![]() Hein, Andreas ![]() ![]() in Proceedings of the International Astronautical Congress 2022 (2022, September) The servitization of space is introducing profound change, challenging established companies with new business models, and significantly lowering the entry barrier to space. New types of services such as ... [more ▼] The servitization of space is introducing profound change, challenging established companies with new business models, and significantly lowering the entry barrier to space. New types of services such as Mission-as-a-Service, Satellite-as-a-Service, Constellation-as-a-Service, etc., are introduced. However, what these notions mean is not clear and in practice, they are often used with contradicting meanings. This paper aims to provide an initial survey of various new service concepts in the space domain and develops a taxonomy and framework for classifying these emerging services with their underlying systems. A particular emphasis is put on distinguishing novel, "New Space" services from traditional space services. We find that these new space services differ, compared to traditional space services in at least three aspects: New space services have their origin in a transition from a product-to a use-oriented business model and make reference to Cloud computing and its underlying techniques such as virtualization. We conclude that analogous to the terrestrial impact of Cloud computing on the emergence of numerous e-commerce start-ups, we might see a similar surge of in-space applications, building on a new space service backbone. Such a development is likely going to be enabled by the shift from traditionally high capital expenditures of developing space applications to operating expenses, thereby lowering the entry barrier. [less ▲] Detailed reference viewed: 106 (6 UL)![]() Boualouache, Abdelwahab ![]() ![]() in Boualouache, Abdelwahab; Engel, Thomas (Eds.) 2022 IEEE 96th Vehicular Technology Conference: (VTC2022-Fall) (2022, September) As a leading enabler of 5G, Network Slicing (NS) aims at creating multiple virtual networks on the same shared and programmable physical infrastructure. Integrated with 5G-Vehicle-to-Everything (V2X ... [more ▼] As a leading enabler of 5G, Network Slicing (NS) aims at creating multiple virtual networks on the same shared and programmable physical infrastructure. Integrated with 5G-Vehicle-to-Everything (V2X) technology, NS enables various isolated 5G-V2X networks with different requirements such as autonomous driving and platooning. This combination has generated new attack surfaces against Connected and Automated Vehicles (CAVs), leading them to road hazards and putting users' lives in danger. More specifically, such attacks can either intra-slice targeting the internal service within each V2X Network Slice (V2X-NS) or inter-slice targeting the cross V2X-NSs and breaking the isolation between them. However, detecting such attacks is challenging, especially inter-slice V2X attacks where security mechanisms should maintain privacy preservation and NS isolation. To this end, this paper addresses detecting inter-slice V2X attacks. To do so, we leverage both Virtual Security as a Service (VSaS) concept and Deep learning (DL) together with Federated learning (FL) to deploy a set of DL-empowered security Virtual Network Functions (sVNFs) over V2X-NSs. Our privacy preservation scheme is hierarchical and supports FL-based collaborative learning. It also integrates a game-theory-based mechanism to motivate FL clients (CAVs) to provide high-quality DL local models. We train, validate, and test our scheme using a publicly available dataset. The results show our scheme's accuracy and efficiency in detecting inter-slice V2X attacks. [less ▲] Detailed reference viewed: 47 (3 UL)![]() Jalali, Mahdis ![]() ![]() ![]() in IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 12–15 September 2022, Virtual Conference (2022, September) The commercial low earth orbiting (LEO) satellite constellations have shown unprecedented growth. Accordingly, the risk of generating harmful interference to the geostationary orbit (GSO) satellite ... [more ▼] The commercial low earth orbiting (LEO) satellite constellations have shown unprecedented growth. Accordingly, the risk of generating harmful interference to the geostationary orbit (GSO) satellite services increases with the number of satel- lites in such mega-constellations. As the GSO arc encompasses the primary and existing satellite assets providing essential fixed and broadcasting satellite services, the interference avoidance for this area is of the utmost importance. In particular, non- geostationary orbit (NGSO) operators should comply with the regulations set up both by their national regulators and by the International Telecommunications Union (ITU) to minimize the impact of emissions on existing GSO and non-GSO systems. In this paper, we first provide an overview of the most recent radio regulations that dictate the NGSO-GSO spectral co-existence. Next, we analyze the NGSO-GSO radio frequency interference for the downlink scenario, following the so-called time-simulation methodology introduced by ITU. The probability distribution of aggregated power flux-density for NGSO co-channel interference is evaluated and assessed, adopting different degrees of exclusion angle strategy for interference avoidance. We conclude the paper by discussing the resulting implications for the continuity of operation and service provision and we provide remarks for future work [less ▲] Detailed reference viewed: 117 (45 UL)![]() Mahfouz, Ahmed ![]() in IAC 2022 congress proceedings, 73rd International Astronautical Congress (IAC) (2022, September) This study explores the reinforcement learning (RL) approach to constructing attitude control strategies for a LEOsatellite with flexible appendages. Attitude control system actuated by a set of three ... [more ▼] This study explores the reinforcement learning (RL) approach to constructing attitude control strategies for a LEOsatellite with flexible appendages. Attitude control system actuated by a set of three reaction wheels is considered.The satellite is assumed to move in a circular low Earth orbit under the action of gravity-gradient torque, randomdisturbance torque, and oscillations excited in flexible appendages. The control policy for rest-to-rest slew maneuversis learned via the Proximal Policy Optimization (PPO) technique. The robustness of the obtained control policy isanalyzed and compared to that of conventional controllers. The first part of the study is focused on problem formulationin terms of Markov Decision Processes, analysis of different reward-shaping techniques, and finally training the RL-agent and comparing the obtained results with the state-of-the-art RL-controllers as well as with the performance ofa commonly used quaternion feedback regulator (Lyapunov-based PD controller). We then proceed to consider thesame spacecraft with flexible appendages added to its structure. Equations of excitable oscillations are appended tothe system and coupling terms are added describing the interactions between the main rigid body and the flexiblestructures. The dynamics of the rigid spacecraft thus becomes coupled with that of its flexible appendages and thecontrol strategy should change accordingly in order to prevent actions that entail excitation of oscillation modes.Again PPO is used to learn the control policy for rest-to-rest slew maneuvers in the extended system. All in all,the proposed reinforcement learning strategy is shown to converge to a policy that matches the performance of thequaternion feedback regulator for a rigid spacecraft. It is also shown that a policy can be trained to take into accountthe highly nonlinear dynamics caused by the presence of flexible elements that need to be brought to rest in the requiredattitude. We also discuss the advantages of the reinforcement learning approach such as robustness and ability of onlinelearning pertaining to the systems that require a high level of autonomy [less ▲] Detailed reference viewed: 30 (0 UL)![]() Tawakuli, Amal ![]() ![]() in 2022 IEEE 96th Vehicular Technology Conference: (VTC2022-Fall) (2022, September) Vehicles have transformed into sophisticated com- puting machines that not only serve the objective of transporta- tion from point A to point B but serve other objectives including improved experience ... [more ▼] Vehicles have transformed into sophisticated com- puting machines that not only serve the objective of transporta- tion from point A to point B but serve other objectives including improved experience, safer journey, automated and more efficient and sustainable transportation. With such sophistication comes complex applications and enormous volumes of data generated from diverse types of vehicle sensors and components. Automotive data is not sedentary but moves from the edge (the vehicle) to the cloud (e.g., infrastructure of the vehicle manufacturers, national highway agencies, insurance companies, etc.). The exponential increase in data volume and variety generated in modern vehicles far exceeds the rate of infrastructure scaling and expansion. To mitigate this challenge, the computational and storage capacities of vehicle components can be leveraged to perform in-vehicle operations on the data to either prepare and transform (prepro- cess) the data or extract information from (process) the data. This paper focuses on distributing data preprocessing to the vehicle and highlights the benefits and impact of the distribution including on the consumption of resources (e.g., energy). [less ▲] Detailed reference viewed: 54 (3 UL)![]() ; Mahfouz, Ahmed ![]() in IAC 2022 congress proceedings, 73rd International Astronautical Congress (IAC) (2022, September) t is anticipated that space exploration will need to rely on In Situ Resource Utilization (ISRU) in order toextend spacecraft lifetime and/or reduce the missions cost and/or the cruise time. For the Moon ... [more ▼] t is anticipated that space exploration will need to rely on In Situ Resource Utilization (ISRU) in order toextend spacecraft lifetime and/or reduce the missions cost and/or the cruise time. For the Moon and, inthe future, Mars colonization, relying on in-situ resources is a necessary step to become independent fromthe Earth. The possibility to produce resources on the Moon is advantageous for those missions that aretoo far from the Earth to be resupplied. At the SnT Research Centre, the Luxembourg Space Agency issupporting a feasibility study to assess the benefit of on-orbit servicing (OOS), exploiting lunar resourcesfor the Herschel Space Observatory. Herschel ended its operations in 2013 as a consequence of the depletionof its coolant and, in turn, of the capability of cooling down its instruments. To extend its operations,a resupply mission has been envisaged relying on an adapted cargo spacecraft employed in lunar gatewayoperations. This paper deals with the trajectory design and optimization of the cargo on its journey from theMoon to rendezvous with Herschel and with orbit and attitude control. Considering Herschel’s orientationon its orbit, with the sunshield in the direction of the Sun and the need to access to Herschel’s rear panelto perform the resupply operation, a final approach along the negative x-axis, where the primaries lie, isconsidered. A multiple shooting technique is used to perform a flanking manoeuvre. Moreover, an attitudecontrol algorithm is adopted to track the attitude trajectory provided by the guidance algorithms which, inturn, ensure minimum thrusting errors of the cargo spacecraft and a continuous visibility of Herschel. Infuture works, different perturbations will be considered and angular rates induced by the movement of therobotic arms will be compensated [less ▲] Detailed reference viewed: 41 (0 UL)![]() Bhuiyan, Rajon ![]() ![]() in Proceedings of the 18th International Conference on the European Energy Market (EEM) (2022, September) There are different flexibility options to align power systems to volatile feed-in of renewable electricity sources. The flexibility options differ in the dimensions of time, spatiality, and resource type ... [more ▼] There are different flexibility options to align power systems to volatile feed-in of renewable electricity sources. The flexibility options differ in the dimensions of time, spatiality, and resource type. To make policy decisions on future energy systems, it is necessary to get a top-down indication of how much power system flexibility is needed. With the ongoing energy transition, there is yet no comprehensive overview of indicators that describe which dimension of flexibility will be necessary to what extent for different energy systems. Therefore, this paper provides a first overview of indicators that can be used to assess the necessity of power system flexibility. Thus, we do a systematic literature review to identify indicators that allow us to estimate the necessity of power system flexibility. We conduct a meta-analysis of these indicators and categorize them as indicators that either stand for an increasing or decreasing necessity of power system flexibility. Our paper can help inform policy, assess needed changes to system operations, increase stakeholder acceptance and investor confidence in implementing new technology and measures. [less ▲] Detailed reference viewed: 149 (43 UL)![]() Rathinam, Arunkumar ![]() ![]() ![]() in 73rd International Astronautical Congress, Paris 18-22 September 2022 (2022, September) Orbital debris removal and On-orbit Servicing, Assembly and Manufacturing [OSAM] are the main areas for future robotic space missions. To achieve intelligence and autonomy in these missions and to carry ... [more ▼] Orbital debris removal and On-orbit Servicing, Assembly and Manufacturing [OSAM] are the main areas for future robotic space missions. To achieve intelligence and autonomy in these missions and to carry out robot operations, it is essential to have autonomous guidance and navigation, especially vision-based navigation. With recent advances in machine learning, the state-of-the-art Deep Learning [DL] approaches for object detection, and camera pose estimation have advanced to be on par with classical approaches and can be used for target pose estimation during relative navigation scenarios. The state-of-the-art DL-based spacecraft pose estimation approaches are suitable for any known target with significant surface textures. However, it is less applicable in a scenario where the target is a texture-less and symmetric object like rocket nozzles. This paper investigates a novel ellipsoid-based approach combined with convolutional neural networks for texture-less space object pose estimation. Also, this paper presents the dataset for a new texture-less space target, an apogee kick motor, which is used for the study. It includes the synthetic images generated from the simulator developed for rendering synthetic space imagery. [less ▲] Detailed reference viewed: 113 (12 UL)![]() ; ; et al in 15th Intl. Conf. on Computational Intelligence in Security for Information Systems (CISIS'22) (2022, September) With the generalisation of distributed computing paradigms to sustain the surging demands for massive processing and data-analytic capabilities, the protection of the intellectual property tied to the ... [more ▼] With the generalisation of distributed computing paradigms to sustain the surging demands for massive processing and data-analytic capabilities, the protection of the intellectual property tied to the executed programs transferred onto these remote shared platforms becomes critical. A more and more popular solution to this problem consists in applying obfuscating techniques, in particular at the source code level. Informally, the goal of obfuscation is to conceal the purpose of a program or its logic without altering its functionality, thus preventing reverse-engineering on the program even with the help of computing resources. This allows to protect software against plagiarism, tampering, or finding vulnerabilities that could be used for different kinds of attacks. The many advantages of code obfuscation, together with its low cost, makes it a popular technique. This paper proposes a novel methodology for source code obfuscation relying on the reference LLVM compiler infrastructure that can be used together with other traditional obfuscation techniques, making the code more robust against reverse engineering attacks. The problem is defined as a Multi-Objective Combinatorial Optimization (MOCO) problem, where the goal is to find sequences of LLVM optimizations that lead to highly obfuscated versions of the original code. These transformations are applied to the back-end pseudo- assembly code (i.e., LLVM Intermediate Representation), thus avoiding any further optimizations by the compiler. Three different problem flavours are defined and solved with popular NSGA-II genetic algorithm. The promising results show the potential of the proposed technique. [less ▲] Detailed reference viewed: 138 (3 UL)![]() Monzon Baeza, Victor ![]() ![]() ![]() Scientific Conference (2022, September) Detailed reference viewed: 128 (26 UL)![]() Cisterna, Carolina ![]() ![]() ![]() in The impact of total cost of ownership on MaaS system appeal using an agent-based approach (2022, September) Despite the interest in the MaaS system is growing fast within the scientific community, it remains uncertain if MaaS could be a potential tool able to reduce car ownership. This study aims to capture the ... [more ▼] Despite the interest in the MaaS system is growing fast within the scientific community, it remains uncertain if MaaS could be a potential tool able to reduce car ownership. This study aims to capture the impact of the total cost of ownership (TCO) on MaaS demand by endogenizing the MaaS choice and the TCO within the users’ travel choice in an agent-based model. We simulate different TCO price range starting from a benchmark cost in the literature and embed a specific type of MaaS plan which gives unlimited access to the services. Results show a significant growth of MaaS demand when TCO rises, in particular MaaS members are car users who shift their mode choice to public transport by travelling within more trips but in a shorter time slot. In contrast, MaaS users employ public transport for short trips while they still employ cars reducing their travel time but employing the same number of trips when TCO decreases. Results suggest that MaaS might become a more sustainable service by developing specific subsidies to discourage car ownership and by increasing mobility accessibility. [less ▲] Detailed reference viewed: 31 (0 UL)![]() ; ; Hosseini Kivanani, Nina ![]() in Proc. Interspeech 2022 (2022, September) Motivational speaking usually conveys a highly emotional message and its purpose is to invite action. The goal of this paper is to investigate the prosodic realization of one particular type of cheering ... [more ▼] Motivational speaking usually conveys a highly emotional message and its purpose is to invite action. The goal of this paper is to investigate the prosodic realization of one particular type of cheering, namely inciting cheering for single addressees in sport events (here, long-distance running), using the name of that person. 31 native speakers of German took part in the experiment. They were asked to cheer up an individual marathon runner in a sporting event represented by video by producing his or her name (1-5 syllables long). For reasons of comparison, the participants also produced the same names in isolation and carrier sentences. Our results reveal that speakers use different strategies to meet their motivational communicative goals: while some speakers produced the runners’ names by dividing them into syllables, others pronounced the names as quickly as possible putting more emphasis on the first syllable. A few speakers followed a mixed strategy. Contrary to our expectations, it was not the intensity that mostly contributes to the differences between the different speaking styles (cheering vs. neutral), at least in the methods we were using. Rather, participants employed higher fundamental frequency and longer duration when cheering for marathon runners. [less ▲] Detailed reference viewed: 48 (7 UL)![]() Rana, Loveneesh ![]() ![]() in Proceedings of International Astronautical Congress (2022, September) Detailed reference viewed: 45 (1 UL)![]() ![]() Baumann, Isabell Eva ![]() Scientific Conference (2022, September) Detailed reference viewed: 30 (0 UL)![]() ; ; Lagunas, Eva ![]() in IEEE International Mediterranean Conference on Communications and Networking (IEEE MediCom), Athens, Greece, Sept. 2022 (2022, September) Detailed reference viewed: 42 (6 UL)![]() ; ; et al in Current Directions in Biomedical Engineering (2022, September), 8(2), 572-575 Detailed reference viewed: 39 (6 UL)![]() Sinnig, Julia ![]() in Taeger, Jürgen (Ed.) Tagungsband 2022: Daten, Plattformen und KI als Dreiklang unserer Zeit (2022, September) Detailed reference viewed: 14 (0 UL)![]() Jubba Honnaiah, Puneeth ![]() ![]() ![]() in 2022 11th Advanced Satellite Multimedia Systems Conference and the 17th Signal Processing for Space Communications Workshop (ASMS/SPSC) (2022, September) Conventional multi-beam pattern design in Geostationary (GEO) satellite communication systems consists of a regular grid of non-reconfigurable beams, where the beams overlap is typically assumed at the ... [more ▼] Conventional multi-beam pattern design in Geostationary (GEO) satellite communication systems consists of a regular grid of non-reconfigurable beams, where the beams overlap is typically assumed at the point where the beam edge reaches a 3-dB loss in the antenna pattern (with respect to the beam center). For certain high demand areas, this 3dB loss has a significant impact. To overcome this issue, in this paper we evaluate the potential gain of beam densification, i.e. considering an increased number of beams (keeping the same beam size and shape) to cover hot-spot areas, with the aim to push the beam overlap and increase the beam gain. In particular, we compare two beam patterns (kindly provided by ESA): One with regular beam grid, and one with densification in a particular hot-spot area. We provide a comparison in terms of per-beam average SINR and capacity, as well as an overall system analysis considering the whole densified region. [less ▲] Detailed reference viewed: 31 (4 UL)![]() Hofmann, Mahulena ![]() in Hofmann, Mahulena (Ed.) Luxembourg Completing its Space Legislation (2022, September) On January 2021, the general Space Law of Luxembourg entered into force. It complemented the 2017 Law on Space Resources by an authorization regime applicable to the remaining space activities under ... [more ▼] On January 2021, the general Space Law of Luxembourg entered into force. It complemented the 2017 Law on Space Resources by an authorization regime applicable to the remaining space activities under Luxembourg's jurisdiction. By these steps, the Luxembourg authorities have now at their disposal a full-coverage legal framework capable to authorize all space activities. [less ▲] Detailed reference viewed: 29 (0 UL)![]() ; ; Lagunas, Eva ![]() in Advanced Satellite Multimedia Conference / Signal Processing for Space Communications Workshop (ASMS), Gratz, Viena, Sept. 2022 (2022, September) Detailed reference viewed: 37 (6 UL)![]() Pauly, Laure ![]() ![]() Poster (2022, September) Detailed reference viewed: 26 (1 UL)![]() Kumar, Sumit ![]() ![]() ![]() in 11th Advanced Satellite Multimedia Conference (2022, September) The integration of 5G with Non-Terrestrial Network (NTN) components is going through a series of technological advancements and soon satellites will be a part of the 5G ecosystem. Early demonstrators ... [more ▼] The integration of 5G with Non-Terrestrial Network (NTN) components is going through a series of technological advancements and soon satellites will be a part of the 5G ecosystem. Early demonstrators, especially based on open-source implementations, are essential to support further research. In this work, we discuss the ongoing activities and developments related to the project 5G-Enabled Ground Segment Technologies OverThe-Air Demonstrator (5G-GoA) which has been funded under the ESA-ARTES program. The vision of 5G-GoA is developing and implementing suitable modifications in the 5G New Radio (NR) standard for enabling direct radio access to 5G services using a transparent GEO satellite. For this purpose, we have used OpenAirInterface(OAI) which is a Software Defined Radio (SDR) based open-source implementation of the 5G-NR protocol stack. We adapted it to address the challenges caused by the excessive round-trip delay in GEO satellites. Our solutions encompass all the layers of the 5G protocol stack: The physical layer (e.g. synchronization) up to upper layer implementations (e.g. timers and random-access procedure) of the Radio Access Network. Our modifications comply with the specifications mentioned for 5GNTN in the recently frozen 3GPP Release-17. An end-to-end demonstrator has been developed for in-lab validation over a satellite channel emulator prior to over-the-satellite testing. Our initial experiments show promising results and the feasibility of direct access to 5G services through transparent GEO satellites. [less ▲] Detailed reference viewed: 42 (3 UL)![]() Odenbreit, Christoph ![]() ![]() ![]() in ce/papers (2022, August 31) A series of demountable connections for reusable composite flooring systems and a standardized adjustable steel connection have been developed and tested, to facilitate circular economy as well as the ... [more ▼] A series of demountable connections for reusable composite flooring systems and a standardized adjustable steel connection have been developed and tested, to facilitate circular economy as well as the serial production of structural elements and the suitability to be added into BIM or other digital tools. Demountable beam and floor elements and adjustable steel con-nections form the basis of a Lego-liked ‘plug and play’ circular framed structural system. This paper presents the proposed circular system, the results from experiments and finite element analyses and indicates the analysing methods for structural engineers to open a path way for fully implementation of the structures ‘as built’ into digital tools, fabrication and construction. [less ▲] Detailed reference viewed: 37 (2 UL)![]() Romero, Alfredo ![]() ![]() in ce/papers (2022, August 31) In the last years, new connectors of steel-concrete composite flooring systems have been developed and investigated to enhance the circularity and standardisation of building components. Recent studies ... [more ▼] In the last years, new connectors of steel-concrete composite flooring systems have been developed and investigated to enhance the circularity and standardisation of building components. Recent studies showed that timber can be used as an alternative to the concrete slab in hybrid structures. However, the knowledge in steel-timber composite flooring systems is still very limited. This contribution presents numerical investigations of steel-LVL timber composite beams. The load deformation behaviour was determined through 3D finite element models. The design resistance of the composite beams was estimated analytically through a strain-controlled approach. The results of this study show that the resistances obtained in the numerical models and the strain-controlled approach are in good agreement. Moreover, obtained deflections and slip values were given at ultimate load. [less ▲] Detailed reference viewed: 39 (1 UL)![]() Liga, Davide ![]() in Intelligent Systems and Applications (2022, August 31) Detailed reference viewed: 21 (0 UL)![]() Hassanzadeh Saraei, Sina ![]() ![]() Scientific Conference (2022, August 30) Suspensions of particles in a fluid domain could be seen in different natural and industrial applications, ranging from food production to blood flow. For this reason, many researchers studied this topic ... [more ▼] Suspensions of particles in a fluid domain could be seen in different natural and industrial applications, ranging from food production to blood flow. For this reason, many researchers studied this topic to get a better insight into the physics of the problem. One of the main topics in this field is to understand the inter-particle forces. In which, particles in the fluid domain face three main forces, which are hydrodynamic long-range interaction, a collision between particles, and lubrication forces. [1] Treatment of first and second forces is straightforward because they could be modeled accurately with the computational fluid dynamics (CFD) method coupled with the Discrete Element Method (CFD-DEM). However, this strategy becomes less accurate for calculating lubrication force when two particles approach each other in a gap distance smaller than the grid size. This is because the grid resolution is not fine enough to capture the correct hydrodynamic interaction. Among different CFD methods that could be implemented to consider the physics of the suspensions of particles, Immersed Boundary (IB) method has provided a better description of the nature of the topic since it could be used to provide fully resolved CFD simulation. However, the results of the previous researchers also have shown the IB methods also face difficulty in correctly capturing the lubrication effects. Although some researchers have proposed to add a corrective force term in the IB method, this strategy faces a stability problem when there are many particles inside the simulation domain. For this reason, Naoki Hori et al [2] proposed a new strategy to use IB without considering any correction term. In their work, the C dt parameter is defined as a function of time step size, fluid viscosity, and mesh resolution. By keeping this parameter in a specific range, IB could simulate lubrication force with high accuracy, meaning that the grid resolution and time step size are the key parameters in determining the lubrication force. [2] In the present work, a variant of the IB method named the hybrid immersed-boundary/fictitious domain (HFD-IB) method was selected as the CFD solver. [3] Then, it was coupled with the XDEM code to consider the collision forces between the particles. After successful validation of this CFD-DEM solver, the problem of falling two inline spherical particles in the fluid domain is considered. Our solver could get the interaction forces between two-particle correctly by keeping the C dt in a specific range mentioned by the reference articles. As seen in Figure 1, drafting, kissing, and tumbling of particles are illustrated. References [1] Kroupa, M., Vonka, M., Soos, M. and Kosek, J., 2016. Utilizing the discrete element method for the modeling of viscosity in concentrated suspensions. Langmuir, 32(33), pp.8451-8460. [2]Hori, N., Rosti, M.E. and Takagi, S., 2022. An Eulerian-based immersed boundary method for particle suspensions with implicit lubrica [3] Municchi, F. and Radl, S., 2017. Consistent closures for Euler-Lagrange models of bi-disperse gas-particle suspensions derived from particle-resolved direct numerical simulations. International Journal of Heat and Mass Transfer, 111, pp.171-190. [less ▲] Detailed reference viewed: 71 (9 UL)![]() ![]() Kijamet, Dzenita ![]() ![]() Poster (2022, August 29) Detailed reference viewed: 28 (1 UL)![]() ![]() Albert, Isabelle ![]() ![]() ![]() Scientific Conference (2022, August 26) In the past years, more and more young migrants from third countries have arrived to Europe. While the economies of ageing European societies can profit from an influx of young people in their labour ... [more ▼] In the past years, more and more young migrants from third countries have arrived to Europe. While the economies of ageing European societies can profit from an influx of young people in their labour market, the integration of young third-country nationals poses also challenges both to individuals and societies. The integration of young migrants is a dynamic process that encompasses developmental and adaptive processes at multiple levels and over time. In particular young migrants in vulnerable conditions might be at risk for social exclusion. In order to understand the factors that foster or hinder integration, it is therefore particularly important to analyze the ingroup-outgroup processes involved here from a societal, institutional and individual perspective. The present study is part of the larger EU-funded H2020 MIMY project (EMpowerment through liquid Integration of Migrant Youth in vulnerable conditions) which involves 13 multinational and interdisciplinary partners to study the integration processes of young non-EU migrants across 9 countries (Luxembourg, Germany, United Kingdom, Sweden, Norway, Italy, Poland, Romania, and Hungary). The MIMY project applies a mixed methods approach, including secondary data analysis as well as qualitative data from young migrants and their parents, from host society nationals and stakeholders through narrative, biographical and expert interviews as well as focus groups. For the present contribution, we will concentrate on qualitative data collected in Luxembourg. More precisely, drawing on focus group interviews regarding the challenges and resources in the integration processes of migrant youth, we will analyze here the ingroup-outgroup processes as described by migrant youth themselves as well as by migrant parents of adolescents/emerging adults living in Luxembourg. We will in particular identify processes of social identity, intergroup attitudes and patterns of social contact. Thereby, a special focus will be put on the experiences of social inclusion/exclusion and host societal attitudes toward migrants as experienced by our study participants. Our results will be discussed in relation to current integration policies, and ideas for an improvement of the situation of young migrants in Luxembourg and Europe will be formulated. [less ▲] Detailed reference viewed: 60 (6 UL)![]() Boualouache, Abdelwahab ![]() in 2022 IEEE 95th Vehicular Technology Conference: (VTC2022-Spring) (2022, August 25) Connected and Automated Vehicles (CAVs) represent one of the main verticals of 5G to provide road safety, road traffic efficiency, and user convenience. As a key enabler of 5G, Network Slicing (NS) aims ... [more ▼] Connected and Automated Vehicles (CAVs) represent one of the main verticals of 5G to provide road safety, road traffic efficiency, and user convenience. As a key enabler of 5G, Network Slicing (NS) aims to create Vehicle-to-Everything (V2X) network slices with different network requirements on a shared and programmable physical infrastructure. However, NS has generated new network threats that might target CAVs leading to road hazards. More specifically, such attacks may target either the inner functioning of each V2X-NS (intra-slice) or break the NS isolation. In this paper, we aim to deal with the raised question of how to detect intra-slice V2X attacks. To do so, we leverage both Virtual Security as a Service (VSaS) concept and deep learning (DL) to deploy a set of DL-empowered security Virtual Network Functions (sVNFs) within V2X-NSs. These sVNFs are in charge of detecting such attacks, thanks to a DL model that we also build in this work. The proposed DL model is trained, validated, and tested using a publicly available dataset. The results show the efficiency and accuracy of our scheme to detect intra-slice V2X attacks. [less ▲] Detailed reference viewed: 40 (3 UL)![]() Goger, Szabolcs ![]() ![]() ![]() Poster (2022, August 23) Detailed reference viewed: 56 (2 UL)![]() Spirinelli, Fabio ![]() Scientific Conference (2022, August 18) Since the 1990s the Luxembourg government has increasingly used the past to improve the country’s image. Though this use of history was not new, it has evolved significantly from the 1990s onward, both ... [more ▼] Since the 1990s the Luxembourg government has increasingly used the past to improve the country’s image. Though this use of history was not new, it has evolved significantly from the 1990s onward, both due to international influences and to specifically Luxembourgish developments. The transformation of the cultural landscape, the organisation of large events, and the European integration process are some examples. The contribution will analyse the uses of the past by public authorities in Luxembourg within this context. The paper will cover a series of key events and initiatives since the 1990s. It aims to understand how history has been used and shaped to promote a national identity and improve Luxembourg’s image, from the 150th anniversary of independence in 1989 to the more recent nation-branding initiatives. It investigates what kind of narratives were disseminated, who the involved stakeholders were, and whether tensions existed in this process. [less ▲] Detailed reference viewed: 36 (5 UL)![]() Kaliski, Adam ![]() ![]() Scientific Conference (2022, August 18) Detailed reference viewed: 36 (1 UL)![]() ![]() ; Schafer, Valerie ![]() Scientific Conference (2022, August 17) With a view to ensuring future access to digital cultural heritage, the first Web collections were established in the mid-1990s. To date there exist for example some 25 national Web archives in Europe ... [more ▼] With a view to ensuring future access to digital cultural heritage, the first Web collections were established in the mid-1990s. To date there exist for example some 25 national Web archives in Europe that collect and preserve Web material and the Internet Archive has saved 651 billion pages since 1996. However, research projects based on the archived Web rarely engage with or include the general public. There are several reasons for this limited use of Web archives: there is a lack of awareness and a lack of examples demonstrating their value; to use them requires skills that many people do not have; and no quick and easy access is available (Winters, 2017). However, several research projects were developed which are of interest for the general public: some of them have studied national Web ('Probing a nation’s Web sphere — the historical development of the Danish Web' (DK, 2013-), 'Big UK Domain Data for the Arts and Humanities' (UK, 2014-15), etc.), others have focused on the web activity in relation to an event, for instance the terrorist attacks in France (‘Archives sauvegarde attentats Paris' (FR, 2016)). In 2020, a nationally funded researcher network has been established (WARCnet, DK). Web archiving initiatives have also been very reactive during the COVID crisis (and sometimes invited the public to nominate URLs). This resulted in huge national collections and a unique collection of international web archives gathered by the IIPC thanks to the collaboration of more than 30 web archiving institutions (https://archive-it.org/collections/13529). As leaders of and/or participants in several of these initiatives, the proposers aim to stimulate greater involvement of the public with the treasure trove to be found in Web archives. Web archives contain their histories, but these important stories are largely hidden from view. The proposers want to create a frame for developing an ambitious relationship with the public, by identifying the challenges and limits to their involvement in Digital Public History at the level of: - Web archiving How/why could we better include publics in the selection of archived content? What is the added value? What are the constraints (i.e legal deposit)? How can we make information about access to Web archives available and raise public awareness of Web archiving? - Selection and analysis of archives Web archives require good knowledge of the Web archiving process if they are to be used effectively. The identification of scarce existing resources for the general public will be coupled with a perspective on needs and tools. - Dissemination Legal and ethical issues (author rights, gender bias, etc.) must be taken into account and the very notion of what is public must be refined. All these elements advocate for an in-depth reflection and this working group is the starting point for a better inclusion of audiences in the creation/selection, use and enhancement of Web archives. [less ▲] Detailed reference viewed: 64 (10 UL)![]() Harnoncourt, Julia ![]() ![]() Scientific Conference (2022, August 17) Detailed reference viewed: 32 (2 UL)![]() Vanden Berghe, Anastasia ![]() ![]() Poster (2022, August 15) The robotic art installation “Mirror, Mirror” is a result of a creative collaboration between an artist and an engineer. The aim of this project is to transform a person’s image and background in order to ... [more ▼] The robotic art installation “Mirror, Mirror” is a result of a creative collaboration between an artist and an engineer. The aim of this project is to transform a person’s image and background in order to prompt them to examine their version of self and the surrounding reality and make them aware of the developments in the field of social robotics and Artificial Intelligence. [less ▲] Detailed reference viewed: 49 (1 UL)![]() Arslan, Yusuf ![]() ![]() ![]() in Holzinger, Andreas; Kieseberg, Peter; Tjoa, A. Min (Eds.) et al Machine Learning and Knowledge Extraction (2022, August 11) Machine Learning (ML) models are inherently approximate; as a result, the predictions of an ML model can be wrong. In applications where errors can jeopardize a company's reputation, human experts often ... [more ▼] Machine Learning (ML) models are inherently approximate; as a result, the predictions of an ML model can be wrong. In applications where errors can jeopardize a company's reputation, human experts often have to manually check the alarms raised by the ML models by hand, as wrong or delayed decisions can have a significant business impact. These experts often use interpretable ML tools for the verification of predictions. However, post-prediction verification is also costly. In this paper, we hypothesize that the outputs of interpretable ML tools, such as SHAP explanations, can be exploited by machine learning techniques to improve classifier performance. By doing so, the cost of the post-prediction analysis can be reduced. To confirm our intuition, we conduct several experiments where we use SHAP explanations directly as new features. In particular, by considering nine datasets, we first compare the performance of these "SHAP features" against traditional "base features" on binary classification tasks. Then, we add a second-step classifier relying on SHAP features, with the goal of reducing false-positive and false-negative results of typical classifiers. We show that SHAP explanations used as SHAP features can help to improve classification performance, especially for false-negative reduction. [less ▲] Detailed reference viewed: 33 (3 UL)![]() Horne, Ross James ![]() ![]() ![]() Scientific Conference (2022, August 10) To address known privacy problems with the EMV standard, EMVCo have proposed a Blinded Diffie-Hellman key establishment protocol, which is intended to be part of a future 2nd Gen EMV protocol. We point ... [more ▼] To address known privacy problems with the EMV standard, EMVCo have proposed a Blinded Diffie-Hellman key establishment protocol, which is intended to be part of a future 2nd Gen EMV protocol. We point out that active attackers were not previously accounted for in the privacy requirements of this proposal protocol, and demonstrate that an active attacker can compromise unlinkability within a distance of 100cm. Here, we adopt a strong definition of unlinkability that does account for active attackers and propose an enhancement of the protocol proposed by EMVCo. We prove that our protocol does satisfy strong unlinkability, while preserving authentication. [less ▲] Detailed reference viewed: 48 (2 UL)![]() Settels, Jason ![]() ![]() Scientific Conference (2022, August 08) Detailed reference viewed: 28 (4 UL)![]() Settels, Jason ![]() Scientific Conference (2022, August 07) Detailed reference viewed: 75 (2 UL)![]() Infanti, Alexandre ![]() in Journal of Behavioral Addictions (2022, August 03) Background and aims: Cyberchondria is characterized by repeated and compulsive online searches for health information, resulting in increased health anxiety and distress. This behavior has been considered ... [more ▼] Background and aims: Cyberchondria is characterized by repeated and compulsive online searches for health information, resulting in increased health anxiety and distress. This behavior has been considered an emerging public health issue, which may have been exacerbated by the COVID-19 pandemic. The present study aimed to investigate changes in the severity of cyberchondria during the pandemic and identify predictors of cyberchondria at this time. Method: Self-reported data on cyberchondria severity (before and during the pandemic), attachment style, impulsivity traits, somatic symptoms, COVID-19-related fears, health anxiety, and intolerance of uncertainty were collected from 725 participants using an online survey distributed in French-speaking European countries during the first wave of the COVID-19 pandemic. Results: COVID-19 pandemic affected various facets of cyberchondria: cyberchondria-related distress and interference with functioning increased, whereas the reassurance facet of cyberchondria decreased. Using supervised machine learning regression analyses, the specific COVID-19-related fears and health anxiety emerged as the strongest predictors of cyberchondria-related distress and interference with functioning during the pandemic. Conclusions: These findings provide evidence about the impact of the COVID-19 pandemic on cyberchondria and identify factors that should be considered in efforts to prevent and manage cyberchondria at times of public health crises. In addition, the findings have implications for the conceptualization and future assessment of cyberchondria. [less ▲] Detailed reference viewed: 97 (6 UL)![]() Lorentz, Joe ![]() in 2022 IEEE International Conference on Omni-layer Intelligent Systems (COINS), Barcelona 1-3 August 2022 (2022, August 01) Abstract—Many real world computer vision applications are required to run on hardware with limited computing power, often referred to as ”edge devices”. The state of the art in computer vision continues ... [more ▼] Abstract—Many real world computer vision applications are required to run on hardware with limited computing power, often referred to as ”edge devices”. The state of the art in computer vision continues towards ever bigger and deeper neural networks with equally rising computational requirements. Model compression methods promise to substantially reduce the computation time and memory demands with little to no impact on the model robustness. However, evaluation of the compression is mostly based on theoretic speedups in terms of required floating-point operations. This work offers a tool to profile the actual speedup offered by several compression algorithms. Our results show a significant discrepancy between the theoretical and actual speedup on various hardware setups. Furthermore, we show the potential of model compressions and highlight the importance of selecting the right compression algorithm for a target task and hardware. The code to reproduce our experiments is available at https://hub.datathings.com/papers/2022-coins. [less ▲] Detailed reference viewed: 29 (6 UL)![]() ; Kumar, Atal Anil ![]() Scientific Conference (2022, August) Detailed reference viewed: 19 (0 UL)![]() Reckinger, Rachel ![]() ![]() ![]() Scientific Conference (2022, August) Within the currently rising concerns around sustainability of food systems, in the related economic areas of regenerative production modes, responsible supply chains and informed consumption, there often ... [more ▼] Within the currently rising concerns around sustainability of food systems, in the related economic areas of regenerative production modes, responsible supply chains and informed consumption, there often remains a practice gap between what people know they should do and what they actually do. This is preceded by a knowledge gap: the knowledge of what a sustainable product specifically is tends not to be entirely consensual, blurred with potentially contradicting injunctions between different claims of sustainability. Instead of trying to solve this puzzle with metrics, we propose an App that makes various components of sustainability transparent, thus qualifying sustainability complexity. Our aim is not to hierarchically determine ‘the best’ sustainable choice, but rather to relationally empower consumers to choose the product with the sustainability criteria that most fit their values and priorities. Goodness Groceries is a University of Luxembourg consumer study piloting a mobile sustainable food shopping app in partnership with a supermarket chain. The App acts as a virtual shopping companion providing eco-responsible and ethical product information of selected staple food products, each time for up to four types: local organic, local conventional, imported organic and imported conventional. The information provided is based on self-assessments made by product suppliers. Each food item is granted criteria in the four main areas of Environment, Social Well-being, Economic Well-being and Good Governance, subdivided into relevant indicators (cf. SAFA guidelines, FAO 2014) – marked with easy-to-recognise icons. The user-friendly App is designed to scan alternatives of the same product via a QR code whilst shopping, to analyse if this helps consumers make an informed choice – or not, and why. Starting in Spring 2022, entailments of the (ongoing) study and App in terms of structural obstacles for researchers, necessary supply chain adaptations for suppliers and analysis of consumers’ shopping habits and App usage feedback will be discussed. [less ▲] Detailed reference viewed: 75 (11 UL)![]() ; Sedlmeir, Johannes ![]() in Proceedings of the International Conference on Availability, Reliability and Security (2022, August) Analyses that fulfill differential privacy provide plausible deniability to individuals while allowing analysts to extract insights from data. However, beyond an often acceptable accuracy tradeoff, these ... [more ▼] Analyses that fulfill differential privacy provide plausible deniability to individuals while allowing analysts to extract insights from data. However, beyond an often acceptable accuracy tradeoff, these statistical disclosure techniques generally inhibit the verifiability of the provided information, as one cannot check the correctness of the participants’ truthful information, the differentially private mechanism, or the unbiased random number generation. While related work has already discussed this opportunity, an efficient implementation with a precise bound on errors and corresponding proofs of the differential privacy property is so far missing. In this paper, we follow an approach based on zero-knowledge proofs (ZKPs), in specific succinct non-interactive arguments of knowledge, as a verifiable computation technique to prove the correctness of a differentially private query output. In particular, we ensure the guarantees of differential privacy hold despite the limitations of ZKPs that operate on finite fields and have limited branching capabilities. We demonstrate that our approach has practical performance and discuss how practitioners could employ our primitives to verifiably query individuals’ age from their digitally signed ID card in a differentially private manner. [less ▲] Detailed reference viewed: 26 (0 UL)![]() Pauly, Laure ![]() Poster (2022, August) Detailed reference viewed: 24 (8 UL)![]() Mazier, Arnaud ![]() Scientific Conference (2022, August) The Simulation Open Framework Architecture (SOFA) is a software environment for building simulations with a particular focus on real-time medical applications, e.g. surgery. Its scope is far broader than ... [more ▼] The Simulation Open Framework Architecture (SOFA) is a software environment for building simulations with a particular focus on real-time medical applications, e.g. surgery. Its scope is far broader than the FEniCS Project, encompassing e.g. rigid body dynamics, interfacing with haptic devices, contact and visualisation. Naturally, it also includes some finite element models of soft tissue mechanics, but these capabilities are currently ‘pre-baked’ and limited to a few simple constitutive models. The goal of this work is to incorporate state-of-the-art code generation tools from the FEniCS Project into SOFA in order to hugely increase SOFA’s capabilities in terms of soft tissue mechanics. To this end we have developed a new SOFA plugin named SOniCS. For adding a new material model in SOniCS, the user describes its strain energy density function using UFL (Unified Form Language) syntax. Then, using FFCx (FEniCSx Form Compiler) we generate the C code associated with the kernels corresponding to the automatically differentiated cell-local residual and stiffness forms. Finally, we assemble these kernels in SOFA into global tensors and solve the resulting non-linear systems of equations. The result is that it is now possible to straightforwardly implement complex material models such as the Holzapfel-Ogden anisotropic model into SOFA, and to use them alongside SOFA’s existing strong feature set in medical simulation. [less ▲] Detailed reference viewed: 158 (11 UL)![]() Deshpande, Saurabh ![]() ![]() ![]() in 15th World Congress on Computational Mechanics (WCCM-XV) (2022, August) Detailed reference viewed: 33 (1 UL)![]() Habera, Michal ![]() ![]() Scientific Conference (2022, August) Many engineering applications require solution of a global finite element problem coupled with nonlinear equations of local nature. Local in the sense, that for a known global state the local solution ... [more ▼] Many engineering applications require solution of a global finite element problem coupled with nonlinear equations of local nature. Local in the sense, that for a known global state the local solution could be found on cell-by-cell basis. Examples include plastic deformation problems, static condensation (hybridization) of displacement-stress formulation or just a simple nonlinear constitutive laws to be satisfied at each quadrature point. These types of problems either required special libraries and extensions in order to be solved with FEniCS (and FEniCS-X) tools, or lead to very slow implementations due to hacks and tricks needed to achieve the solution (e.g. monolithic schemes which increase the matrix problem size). In this talk a unified approach tailored for the current state of FEniCS-X interfaces is presented. The approach computes consistent global tangent operator for nonlinear problems. In addition, local equations are formulated symbolically in UFL, and their derivatives are therefore computed automatically. Several low-level examples (incl. plasticity with symbolic yield surface, nonlinear static condensation and materials with implicit constitutive laws) that demonstrate the main concepts are presented. Finally, high-level wrappers for this functionality are presented. These come as a part of package `dolfiny` (https://github.com/michalhabera/dolfiny). [less ▲] Detailed reference viewed: 34 (5 UL)![]() Gubenko, Alla ![]() ![]() Poster (2022, August) Detailed reference viewed: 36 (3 UL)![]() Zilian, Andreas ![]() ![]() Scientific Conference (2022, August) We present an approach to implement the Tangential Differential Calculus (TDC) for a variety of thin-walled structures (beams, membranes, shells) in the framework of nonlinear kinematics and/or material ... [more ▼] We present an approach to implement the Tangential Differential Calculus (TDC) for a variety of thin-walled structures (beams, membranes, shells) in the framework of nonlinear kinematics and/or material behaviour. In contrast to classical formulations the TDC describes kinematics, equilibrium and constitutive relation of the thin structure (as two-dimensional manifold) on the basis of a full three-dimensional deformation state. This allows to introduce the undeformed configuration of e.g. a shell directly in terms of a mesh of topological dimension 2 and geometrical dimension 3. Of particular interest is the use of finite elements of higher-order geometrical order to capture the (interpolated) curvature of the manifold with high accuracy. Numerical examples and reference implementations of this work to support nonlinear stress and post-buckling analyses (using a realisation of the classical arc-length method in FEniCSx) will be provided as a part of the package dolfiny (https://github.com/michalhabera/dolfiny). [less ▲] Detailed reference viewed: 40 (3 UL)![]() Tran, Duc Dung ![]() ![]() ![]() in Proceedings of 2022 IEEE 95th Vehicular Technology Conference: (VTC2022-Spring) (2022, August) Reducing waiting time due to scheduling process and exploiting multi-access transmission, grant-free non-orthogonal multiple access (GF-NOMA) has been considered as a promising access technology for URLLC ... [more ▼] Reducing waiting time due to scheduling process and exploiting multi-access transmission, grant-free non-orthogonal multiple access (GF-NOMA) has been considered as a promising access technology for URLLC-enabled 5G system with strict requirements on reliability and latency. However, GF-NOMAbased systems can suffer from severe interference caused by the grant-free (GF) access manner which may degrade the system performance and violate the URLLC-related requirements. To overcome this issue, the paper proposes a novel reinforcementlearning (RL)-based random access (RA) protocol based on which each device can learn from the previous decision and its corresponding performance to select the best subchannels and transmit power level for data transmission to avoid strong cross-interference. The learning-based framework is developed to maximize the system access efficiency which is defined as the ratio between the number of successful transmissions and the number of subchannels. Simulation results show that our proposed framework can improve the system access efficiency significantly in overloaded scenarios. [less ▲] Detailed reference viewed: 37 (10 UL)![]() Bendheim, Amelie ![]() Scientific Conference (2022, July 29) Detailed reference viewed: 50 (0 UL)![]() Glesener, Jeanne ![]() Scientific Conference (2022, July 29) Detailed reference viewed: 38 (2 UL)![]() Song, Junlin ![]() ![]() in Proceedings of 2022 International Conference on Unmanned Aircraft Systems (ICUAS) (2022, July 26) Detailed reference viewed: 110 (44 UL)![]() Janz, Nina ![]() Scientific Conference (2022, July 25) The Impact and Legacy of War Experiences in Luxembourg” researches the personal side of the history of Luxembourgish youth born between 1920 and 1927 who were enrolled into German services under the Nazi ... [more ▼] The Impact and Legacy of War Experiences in Luxembourg” researches the personal side of the history of Luxembourgish youth born between 1920 and 1927 who were enrolled into German services under the Nazi occupation of Luxembourg during World War II. The research focuses on personal testimonies and their individual war experience to uncover these men, women, and families’ individual experiences. Using a relational database to represent their war experiences, we face several challenges, such as a data structure that is too rigid and strict to “map” the fluid and unpredictable life patterns of our study subjects. We developed a data model where we treat different life stations (military unit, POW camp etc.) as equal data levels like our recruits (as persons). Each “life station” or event we treat as a “person” and create a separate “biography” to include all relevant data. Afterwards, we link the life stations or events with the actual person in the database. The aim of my contribution is the “translation” of lives, with its twists and turns into a static data set such as a relational database to map the individual war experiences of our study object. [less ▲] Detailed reference viewed: 50 (3 UL)![]() ![]() Kirsch, Claudine ![]() Scientific Conference (2022, July 22) Detailed reference viewed: 22 (1 UL)![]() Besseron, Xavier ![]() Scientific Conference (2022, July 21) In this talk, we will give an overview of the main techniques used for the parallelization of numerical simulations on High-Performance Computing platforms, and provide a particular focus on the Discrete ... [more ▼] In this talk, we will give an overview of the main techniques used for the parallelization of numerical simulations on High-Performance Computing platforms, and provide a particular focus on the Discrete Element Method (DEM), a numerical method for the simulation of the motion of granular materials. We will cover the main parallelization paradigms and their implementations (shared memory with OpenMP and distributed memory with MPI), present the performance bottlenecks and introduce load-balancing techniques. [less ▲] Detailed reference viewed: 111 (42 UL)![]() ![]() Aleksic, Gabrijela ![]() Scientific Conference (2022, July 14) There are 64 % of four-year old children who not speak Luxembourgish at home (MENJE, 2018). The government proclaimed multilingual early education mandatory in 2017, obliging teachers to develop ... [more ▼] There are 64 % of four-year old children who not speak Luxembourgish at home (MENJE, 2018). The government proclaimed multilingual early education mandatory in 2017, obliging teachers to develop children’s Luxembourgish, familiarizing them with French, and valuing their home languages. Thus, the present project was threefold: (1) to offer an 18-hours professional development (PD) course in translanguaging pedagogy to 40 teachers over 6 months, (2) to strengthen home-school collaboration, and (3) to support children’s linguistic, socio-emotional, and cognitive development and engagement in the classroom. The results from teacher questionnaires, focus groups, and interviews, showed that there was some positive change regarding the attitudes towards children’s home languages. The interviews with 17 parents indicated that there was a need for more home-school collaboration. The tests in early literacy and numeracy with 23 preschool children over one year, identified that children performed higher in their home languages. The video observations showed that every time the teacher used children’s languages in the classroom, this impacted positively their well-being. Following the principles of creative activism, the author produced three outcomes: (1) the website with over 100 practical activities on how teachers can involve children’s languages and families, (2) the illustrated book Sumak for parents, showing difficulties with integration in a new country, and (3) the illustrated book, Mara’s song for preschool children, showing how Mara, a girl who is laughed at because of her language and culture, finds her way through singing a song inspired by a bird. [less ▲] Detailed reference viewed: 28 (0 UL)![]() ![]() ; Hoehn, Sviatlana ![]() Scientific Conference (2022, July 14) Detailed reference viewed: 28 (0 UL)![]() Zaagsma, Gerben ![]() Scientific Conference (2022, July 13) This paper discusses the politics of Jewish Studies by focusing on the digitisation of Jewish cultural heritage and its effects for research into Jewish history(ies). In the past few years we have ... [more ▼] This paper discusses the politics of Jewish Studies by focusing on the digitisation of Jewish cultural heritage and its effects for research into Jewish history(ies). In the past few years we have witnessed the emergence of what could be termed the critical turn in digital humanities with an increasing focus on how digital resources shape various parts of the research process and its outcomes. One aspect of that turn is more attention to digital source criticism and the politics of digitisation of cultural heritage. There are many aspects of digitisation that can be considered “political”, from selection for digitisation to modes of access to broader questions about the political aspects of infrastructure or ‘infrapolitics’. None of these is specific to our digital age nor to Jewish Studies, and historical context is crucially important. This paper builds upon my recent reseach into the politics of digitisation and considers the case of Jewish Studies, framed within the broader context of the politics of heritage and its preservation. It set outs a number of broad parameters for discussion, with the aim to encourage further debate. Questions to be addressed include: what Jewish heritage is being digitised and which stories about the Jewish past can (and cannot) be told on its basis? Which players are involved in digitisation and how do both top-down national strategies and bottom-up community initiatives guide the process? How do memory politics influence selection processes? And how does transnational heritage fare in an age where many digitisation programs are nationally framed and funded? The paper will use the historical example of the digitisation of Yiddish heritage to illustrate these questions and provide a concrete example. [less ▲] Detailed reference viewed: 30 (1 UL)![]() Dazhi, Michael ![]() ![]() ![]() in IEEE International Conference on Communications (ICC) (2022, July 11) Dual Connectivity is a key approach to achieving optimization of throughput and latency in heterogeneous networks. Originally a technique introduced by the 3rd Generation Partnership Project (3GPP) for ... [more ▼] Dual Connectivity is a key approach to achieving optimization of throughput and latency in heterogeneous networks. Originally a technique introduced by the 3rd Generation Partnership Project (3GPP) for terrestrial communications, it is not been widely explored in satellite systems. In this paper, Dual Connectivity is implemented in a multi-orbital satellite network, where a network model is developed by employing the diversity gains from Dual Connectivity and Carrier Aggregation for the enhancement of satellite uplink capacity. An introduction of software defined network controller is performed at the network layer coupled with a carefully designed hybrid resource allocation algorithm which is implemented strategically. The algorithm performs optimum dynamic flow control and traffic steering by considering the availability of resources and the channel propagation information of the orbital links to arrive at a resource allocation pattern suitable in enhancing uplink system performance. Simulation results are shown to evaluate the achievable gains in throughput and latency; in addition we provide useful insight in the design of multi-orbital satellite networks with implementable scheduler design. [less ▲] Detailed reference viewed: 241 (94 UL)![]() Pascoal, Túlio ![]() ![]() ![]() Scientific Conference (2022, July 11) The popularization of large-scale federated Genome-Wide Association Study (GWAS) where multiple data owners share their genome data to conduct federated analytics uncovers new privacy issues that have ... [more ▼] The popularization of large-scale federated Genome-Wide Association Study (GWAS) where multiple data owners share their genome data to conduct federated analytics uncovers new privacy issues that have remained unnoticed or not given proper attention. Indeed, as soon as a diverse type of interested parties (e.g., private or public biocenters and governmental institutions from around the globe) and individuals from heterogeneous populations are participating in cooperative studies, interdependent and multi-party privacy appear as crucial issues that are currently not adequately assessed. In fact, in federated GWAS environments, the privacy of individuals and parties does not depend solely on their own behavior anymore but also on others, because a collaborative environment opens new credible adversary models. For instance, one might want to tailor the privacy guarantees to withstand the presence of potentially colluding federation members aiming to violate other members' data privacy and the privacy deterioration that might occur in the presence of interdependent genomic data (e.g., due to the presence of relatives in studies or the perpetuation of previous genomic privacy leaks in future studies). In this work, we catalog and discuss the features, unsolved problems, and challenges to tackle toward truly end-to-end private and practical federated GWAS. [less ▲] Detailed reference viewed: 77 (9 UL)![]() Allegrezza, Silvia ![]() Scientific Conference (2022, July 08) Detailed reference viewed: 25 (0 UL)![]() Stolfi Rosso, Daniel ![]() ![]() in Proceedings of the Genetic and Evolutionary Computation Conference (2022, July 08) Autonomous robot swarm systems allow to address many inherent limitations of single robot systems, such as scalability and reliability. As a consequence, these have found their way into numerous ... [more ▼] Autonomous robot swarm systems allow to address many inherent limitations of single robot systems, such as scalability and reliability. As a consequence, these have found their way into numerous applications including in the space and aerospace domains like swarm-based asteroid observation or counter-drone systems. However, achieving stable formations around a point of interest using different number of robots and diverse initial conditions can be challenging. In this article we propose a novel method for autonomous robots swarms self-organisation solely relying on their relative position (angle and distance). This work focuses on an evolutionary optimisation approach to calculate the parameters of the swarm, e.g. inter-robot distance, to achieve a reliable formation under different initial conditions. Experiments are conducted using realistic simulations and considering four case studies. The results observed after testing the optimal configurations on 72 unseen scenarios per case study showed the high robustness of our proposal since the desired formation was always achieved. The ability of self-organise around a point of interest maintaining a predefined fixed distance was also validated using real robots. [less ▲] Detailed reference viewed: 69 (28 UL)![]() Dal Zilio, Samuel ![]() Scientific Conference (2022, July 08) « L’intelligence et le sens moral d’un enfant de 8 ans », c’est par ces mots qu’en août 1933, le médecin-chef de l’Etablissement de Défense Sociale de Tournai qualifie l’état psychique de Maxence C., un ... [more ▼] « L’intelligence et le sens moral d’un enfant de 8 ans », c’est par ces mots qu’en août 1933, le médecin-chef de l’Etablissement de Défense Sociale de Tournai qualifie l’état psychique de Maxence C., un débile mental (sic) reconnu coupable du chef de vol et d’escroquerie mais jugé incapable du contrôle de ses actions. A l’aube de ses 27 ans, ce « demi-fou » enchaîne depuis vingt ans les séjours en institution. Entre internats médico-pédagogiques, asiles d’aliénés et établissements de défense sociale, le parcours de vie de Maxence C. est jalonné de multiples interactions avec les autorités judiciaires, médicales et administratives qui tantôt le condamne à l’incarcération, tantôt favorise sa réhabilitation au sein de la société. Arrimé à cette identité de marginal dans un « monde faux et crapuleux » selon ses dires, Maxence C. peine à acquérir une pleine autonomie synonyme de liberté (re)trouvée. Travail, suivi médical, tutelle morale et accompagnement familial semblent toujours vains. Devenu sexagénaire, il demeure ainsi un « danger social » balloté entre asiles-prisons et prisons-asiles aux quatre coins du royaume. A travers l’examen minutieux d’un dossier de plusieurs centaines de pages élaboré par la Commission de défense sociale de Forest, cette communication propose de mettre en lumière la complexité de la trajectoire de vie d’un individu à la fois criminel et aliéné, visé par un dispositif hybride de sécurité et de soins. Si cette étude considère la perspective du patient à travers une histoire par le bas, elle dépasse celle-ci pour entrouvrir la possibilité d’un récit polyphonique sur des temps longs qui confronte de multiples voix (celle de l’administration et de la police, celle des médecins et des magistrats, celle du malade et de ses proches). Nourrit par les enseignements de la micro-histoire et de l’étude de cas dans la recherche historique, cette contribution offre un regard original sur l’évolution des normes qui conditionnent un mouvement vers ou, au contraire, hors de l’institution. Les phases d’entrée et de sortie des établissements sont en effet des moments charnières de l’affirmation du pouvoir des acteurs. Dès lors, quels sont les motifs à une incarcération et quelles sont les conditions à un élargissement ? Comment s’organise la prise de la décision entre les différents intervenants ? Et qui en assure le contrôle et le suivi ? Enfin, quelles sont les marges de manœuvre et les capacités d’actions du « malade » face à eux ? Cette étude d’une trajectoire de vie individuelle constitue également une opportunité de s’interroger sur l’évolution des systèmes de prise en charge des criminels malades mentaux dans le royaume au XXème siècle. Ainsi durant l’existence de Maxence C. se créent de nouvelles structures psychiatriques (dispensaires d’hygiène mentale, annexes psychiatriques dans les prisons et les hôpitaux généraux, établissements de défense sociale, etc.) se construisent des nouvelles politiques sociales (INAMI, CPAS, mutualités, etc.), s’élaborent des nouvelles législations (loi relative à la défense sociale, au handicap, à la maladie mentale), s’affirment de nouveaux métiers de la santé mentale (psychologue, infirmière psychiatrique, assistants sociaux, etc.), s’établissent de nouveaux rapports à la folie, au handicap et à la criminalité. [less ▲] Detailed reference viewed: 34 (2 UL) |
||