References of "Scientific congresses, symposiums and conference proceedings"
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See detailDesigning for Qualitative Interfaces: Experiences from Studio Education
Lockton, Dan; Lallemand, Carine UL; Menheere, Daphne

Scientific Conference (in press)

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See detail« … Eripuit servus mihi vitam » - Représentations médiatiques de la violence et de la criminalité dans les provinces occidentales de l'Empire romain
Binsfeld, Andrea UL

in Amodio, Mara (Ed.) The imagery of violence in Roman society (I-VI cent.). Persistence, innovations and interrelations from the Roman to the Christian Empire (in press)

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See detailAn (Un)Necessary Evil - Users’ (Un)Certainty about Smartphone App Permissions and Implications for Privacy Engineering
Bongard, Kerstin UL; Sterckx, Jean-Louis; Rossi, Arianna UL et al

in 2022 7th IEEE European Symposium on Security and Privacy Workshops (EuroSPW) (in press)

App permission requests are a control mechanism meant to help users oversee and safeguard access to data and resources on their smartphones. To decide whether to accept or deny such requests and make this ... [more ▼]

App permission requests are a control mechanism meant to help users oversee and safeguard access to data and resources on their smartphones. To decide whether to accept or deny such requests and make this consent valid, users need to understand the underlying reasons and judge the relevance of disclosing data in line with their own use of an app. This study investigates people’s certainty about app permission requests via an online survey with 400 representative participants of the UK population. The results demonstrate that users are uncertain about the necessity of granting app permissions for about half of the tested permission requests. This implies substantial privacy risks, which are discussed in the paper, resulting in a call for user-protecting interventions by privacy engineers. [less ▲]

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See detailPhysical Journey Maps: Staging Users’ Experiences to Increase Stakeholders’ Empathy towards Users
Lallemand, Carine UL; Lauret, Jessie; Drouet, Luce UL

in Proceedings of the Extended Abstracts of the 2022 CHI Conference on Human Factors in Computing Systems (in press)

Customer Journey Mapping is a widespread service design tool that synthesizes and communicates user research insights to stakeholders. In its common form, a journey map is a synthetic (typically non ... [more ▼]

Customer Journey Mapping is a widespread service design tool that synthesizes and communicates user research insights to stakeholders. In its common form, a journey map is a synthetic (typically non-interactive) visualization of the key steps of the users’ experience with a service or product. By decomposing the elements of a journey map and staging them under the form of a physical and interactive installation, we intend to leverage the power of journey mapping to break silos and prompt employees within an organization to discover end-users journeys in a compelling and empathic way. This aims to support the user-centered maturity of the organization by developing employees’ curiosity and empathy towards users. We illustrate this approach through a case study on railway passengers’ experiences. We explore the value of richer transfers of user research insights through physical journey maps and discuss design processes and mediums enabling journey maps to come to life. [less ▲]

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See detailUpdate Internationales und Europäisches Steuerrecht
Sinnig, Julia UL

in Taeger, Jürgen (Ed.) Tagungsband DSRI-Herbstakademie 2020 (in press)

Im Berichtszeitraum dieses Updates rief die OECD zu einem zweiten Öffentlichkeitsbetei-ligungsverfahren auf und erarbeitete einen präziseren Lösungsansatz zur Besteuerung digitalisierter Geschäftsmodelle ... [more ▼]

Im Berichtszeitraum dieses Updates rief die OECD zu einem zweiten Öffentlichkeitsbetei-ligungsverfahren auf und erarbeitete einen präziseren Lösungsansatz zur Besteuerung digitalisierter Geschäftsmodelle, der in einer Veröffentlichung im Januar 2020 vorgestellt wurde. Auf Ebene der Europäischen Union gab es im Berichtszeitraum keine Weiterent-wicklung der Richtlinienvorschläge zu einer Digitalsteuer und dem Konzept der „signifi-kanten digitalen Präsenz“. Der EuGH urteilte am 3. März 2020 in Hinblick auf die unions-rechtliche Vereinbarkeit zweier ungarischer Umsatzsteuern. Dieses Urteil erlaubt erste Rückschlüsse bezüglich der Europarechtskonformität umsatzbasierter Steuern, wie bspw. auch im Berichtszeitraum eingeführte Digitalsteuern einzelner Mitgliedstaaten. Dieser Beitrag knüpft an die Vorträge von Prof. Dr. Jens M. Schmittmann und der Verfasserin anlässlich der Herbstakademien 2018 in Bochum und 2019 in Oldenburg, sowie dem Vortrag der Verfasserin anlässlich der Herbstakademie 2017 in Heidelberg an. [less ▲]

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See detailAutomated Question Answering for Improved Understanding of Compliance Requirements: A Multi-Document Study
Abualhaija, Sallam UL; Arora, Chetan; Sleimi, Amin et al

in In Proceedings of the 30th IEEE International Requirements Engineering Conference (RE'22), Melbourne, Australia 15-19 August 2022 (in press)

Software systems are increasingly subject to regulatory compliance. Extracting compliance requirements from regulations is challenging. Ideally, locating compliance-related information in a regulation ... [more ▼]

Software systems are increasingly subject to regulatory compliance. Extracting compliance requirements from regulations is challenging. Ideally, locating compliance-related information in a regulation requires a joint effort from requirements engineers and legal experts, whose availability is limited. However, regulations are typically long documents spanning hundreds of pages, containing legal jargon, applying complicated natural language structures, and including cross-references, thus making their analysis effort-intensive. In this paper, we propose an automated question-answering (QA) approach that assists requirements engineers in finding the legal text passages relevant to compliance requirements. Our approach utilizes large-scale language models fine-tuned for QA, including BERT and three variants. We evaluate our approach on 107 question-answer pairs, manually curated by subject-matter experts, for four different European regulatory documents. Among these documents is the general data protection regulation (GDPR) – a major source for privacy-related requirements. Our empirical results show that, in ~94% of the cases, our approach finds the text passage containing the answer to a given question among the top five passages that our approach marks as most relevant. Further, our approach successfully demarcates, in the selected passage, the right answer with an average accuracy of ~ 91%. [less ▲]

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See detailAutomated Handling of Anaphoric Ambiguity in Requirements: A Multi-solution Study
Ezzini, Saad UL; Abualhaija, Sallam UL; Arora, Chetan et al

in In Proceedings of the 44th International Conference on Software Engineering (ICSE'22), Pittsburgh, PA, USA 22-27 May 2022 (in press)

Ambiguity is a pervasive issue in natural-language requirements. A common source of ambiguity in requirements is when a pronoun is anaphoric. In requirements engineering, anaphoric ambiguity occurs when a ... [more ▼]

Ambiguity is a pervasive issue in natural-language requirements. A common source of ambiguity in requirements is when a pronoun is anaphoric. In requirements engineering, anaphoric ambiguity occurs when a pronoun can plausibly refer to different entities and thus be interpreted differently by different readers. In this paper, we develop an accurate and practical automated approach for handling anaphoric ambiguity in requirements, addressing both ambiguity detection and anaphora interpretation. In view of the multiple competing natural language processing (NLP) and machine learning (ML) technologies that one can utilize, we simultaneously pursue six alternative solutions, empirically assessing each using a collection of ~1,350 industrial requirements. The alternative solution strategies that we consider are natural choices induced by the existing technologies; these choices frequently arise in other automation tasks involving natural-language requirements. A side-by-side empirical examination of these choices helps develop insights about the usefulness of different state-of-the-art NLP and ML technologies for addressing requirements engineering problems. For the ambiguity detection task, we observe that supervised ML outperforms both a large-scale language model, SpanBERT (a variant of BERT), as well as a solution assembled from off-the-shelf NLP coreference resolvers. In contrast, for anaphora interpretation, SpanBERT yields the most accurate solution. In our evaluation, (1) the best solution for anaphoric ambiguity detection has an average precision of ~60% and a recall of 100%, and (2) the best solution for anaphora interpretation (resolution) has an average success rate of ~98%. [less ▲]

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See detailEmpathy in Design Scale: Development and Initial Insights
Drouet, Luce UL; Bongard, Kerstin UL; Koenig, Vincent UL et al

in Proceedings of the Extended Abstracts of the 2022 CHI Conference on Human Factors in Computing Systems (in press)

Empathy towards users is crucial to the design of user-centered technologies and services. Previous research focused on defining empathy and its role in the design process for triggering empathy for end ... [more ▼]

Empathy towards users is crucial to the design of user-centered technologies and services. Previous research focused on defining empathy and its role in the design process for triggering empathy for end-users. However, there is a lack of empathy measurement instruments in design. Most previous work focused on designers, overlooking the need for other stakeholders to develop empathy towards the users to break organizational silos and deliver high-quality user-centered services and products. In this contribution, we share the preliminary stages of the development of an empathy scale for service design. We build on empathy literature from psychology and design to define 18 items representing four empathy dimensions. We report on the definition of these dimensions and their underlying items, and present preliminary studies in which we reviewed the first version of the scale with experts and stakeholders. [less ▲]

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See detailEnergy performance comparison of ventilation-based heating versus water-based heating systems in an efficient residential building
Shirani, Arsalan UL; Merzkirch, Alexander; Leyer, Stephan UL et al

in Fluid Dynamics & Material Processing (in press)

The application of air-based heating systems as a possible approach to reduce the construction costs in highly efficient residential buildings is becoming popular. Air-based heating systems have been well ... [more ▼]

The application of air-based heating systems as a possible approach to reduce the construction costs in highly efficient residential buildings is becoming popular. Air-based heating systems have been well-known for their usage in passive houses during the past three decades. Available studies on such systems tend mostly to focus only on comparing exhaust air heat pump technology with conventional systems in efficient buildings. Moreover, most of the existing studies ignore the usual presence of the electrical heaters as backup. Besides, a comprehensive study and comparison between different air-based heating system concepts is still missing. In this study, four different air-based heating system concepts separated by the type of heat source of heat pump for heating and domestic hot water are defined. These systems are compared to four conventional heating system, including floor heating and direct electrical system employing dynamic annual simulations. According to simulation results, the systems with floor heating have shown the best system efficiencies and the lowest energy demand in comparison to the other systems. The main reason for this was the lower supply temperatures of the floor heating systems. Between the air heating systems, the system equipped with an outdoor air heat pump showed a better energy performance than an exhaust air system. The main reason for this could be attributed to the power limitation of exhaust air heat pump systems. [less ▲]

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See detailDISCOV: Stimulating Physical Activity through an Explorative Interactive Walking Experience
van Renswouw, Loes; Verhoef, Jasmijn; Vos, Steven et al

in IASDR 2021: 9th Congress of the International Association of Societies of Design Research (in press)

Aware of the consequences of their inactive lifestyles, many people still struggle to integrate enough physical activity into their busy lives. Interventions that nudge to reinforce existing active ... [more ▼]

Aware of the consequences of their inactive lifestyles, many people still struggle to integrate enough physical activity into their busy lives. Interventions that nudge to reinforce existing active behavior seem therefore more likely to be effective than those adding an activity to daily routines. To encourage people to increase their physical activity level, we designed Discov, a network of physical waypoints triggering people to lengthen their walks. Placed in a public park, Discov encourages people to explore their surroundings in a fun and challenging way by creating an interactive walking experience. Adopting a Research-through-Design approach, we explore the potential of the design of accessible infrastructures and human-environment interactions to impact public health by nudging citizens into being more physically active. We discuss insights gathered through this process and report on first user tests of this interactive walking experience. [less ▲]

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See detailHabilyzer: A User-Driven Open-Ended Sensor Kit for Office Workers
van den Heuvel, Roy; van Bussel, Tjeu; Lallemand, Carine UL

in Proceedings of the Extended Abstracts of the 2022 CHI Conference on Human Factors in Computing Systems (in press)

Office work presents health and wellbeing challenges, triggered by working habits or environmental factors. While technological interventions gain popularity in the workplace, they often fall short of ... [more ▼]

Office work presents health and wellbeing challenges, triggered by working habits or environmental factors. While technological interventions gain popularity in the workplace, they often fall short of acknowledging personal needs. Building on approaches from personal informatics, we present our vision on the use of user-driven, situated sensor probes in an office context and how the community might deal with complex yet timely questions around the use of data to empower people in becoming explorers of their own habits and experiences. We demonstrate Habilyzer, an open-ended sensor toolkit for office workers, which enables user-driven explorations in self-tracking their work routines. This research contributes an alternative approach to improving working habits and vitality in the workplace, moving from solution-oriented technologies to inquiry-enabling tools. Through this demonstration, we also aim to trigger discussions on the use of sensors and data in the office context, in the light of privacy, consent and data ownership. [less ▲]

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See detailUX Needs Cards – A Pragmatic Tool to Support Experience Design Through Psychological Needs
Lallemand, Carine UL

in IASDR 2021: 9th Congress of the International Association of Societies of Design Research (in press)

The psychological needs-driven UX approach is a well-explored area in UX research and a powerful framework for the design of optimal experiences with systems and products. However, the transfer from ... [more ▼]

The psychological needs-driven UX approach is a well-explored area in UX research and a powerful framework for the design of optimal experiences with systems and products. However, the transfer from research to practice is slow and this approach is not yet widely used by practitioners. As card- based methods have been shown to support designers in both the generation of ideas and the evaluation of their designs, we created the UX needs cards as a pragmatic tool able to support a needs-driven UX process. We present the iterative development of the card-set and its associated techniques and report on three use cases, demonstrating the effectiveness of this tool for user research, idea generation and UX evaluation. Our empirical findings suggest that the UX needs cards are a valuable tool able to support design practice, being easily understood by lay users and a source of inspiration for designers. Acting as a tangible translation of a research framework, the UX needs cards promote theory-driven design strategies and provide researchers, designers, and educators with a tool to clearly communicate the framework of psychological needs. [less ▲]

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See detailBlockchain Governance: An Overview and Prediction of Optimal Strategies Using Nash Equilibrium
Khan, Nida UL; Ahmad, Tabrez; Patel, Anass et al

in 3rd AUE International Research Conference (in press)

Blockchain governance is a subject of ongoing research and an interdisciplinary view of blockchain governance is vital to aid in further research for establishing a formal governance framework for this ... [more ▼]

Blockchain governance is a subject of ongoing research and an interdisciplinary view of blockchain governance is vital to aid in further research for establishing a formal governance framework for this nascent technology. In this paper, the position of blockchain governance within the hierarchy of Institutional governance is discussed. Blockchain governance is analyzed from the perspective of IT governance using Nash equilibrium to predict the outcome of different governance decisions. A payoff matrix for blockchain governance is created and simulation of different strategy profiles is accomplished for computation of all Nash equilibria. We also create payoff matrices for different kinds of blockchain governance, which were used to propose novel mathematical formulae usable to predict the best governance strategy that minimizes the occurrence of a hard fork as well as predicts the behavior of the majority during protocol updates. [less ▲]

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See detailFontana: Triggering Physical Activity and Social Connectedness through an Interactive Water Installation
van Renswouw, Loes; van Hamersveld, Yvonne; Huibers, Hugo et al

in Proceedings of the Extended Abstracts of the 2022 CHI Conference on Human Factors in Computing Systems (in press)

Promoting healthy and active lifestyles is an important objective for many governing agencies. The design of active urban environments can be an effective tool to encourage more active behaviors and water ... [more ▼]

Promoting healthy and active lifestyles is an important objective for many governing agencies. The design of active urban environments can be an effective tool to encourage more active behaviors and water features can attract people, improving their experience of the urban space. To explore the potential of these concepts, we designed Fontana; an interactive public installation that aims to stimulate physical activity and social connectedness in the urban outdoor space, using the multidimensional attractiveness of water. We focus on the use of embedded interactive technology to promote physical activity, using water as a linking element between users. Adopting a research-through-design approach, we explored how such installations can nudge people into an active behavior while additionally strengthening social connectedness, using inclusive design principles. We report on insights gathered through this case study and findings of a preliminary user test, discussing the implications of this work for design researchers and practitioners. [less ▲]

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See detailA New Perspective on the Luxembourgish Genitive
Döhmer, Caroline UL

in Germanic Genitives (in press)

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See detailThe Candy Workshop: Supporting Rich Sensory Modalities in Constructive Data Physicalization
Lallemand, Carine UL; Oomen, Maud

in Proceedings of the Extended Abstracts of the 2022 CHI Conference on Human Factors in Computing Systems (in press)

Constructive data physicalization (i.e. the creation of visualizations by non-experts using physical elements) is a promising research area in a context of rapid democratization of data collection and ... [more ▼]

Constructive data physicalization (i.e. the creation of visualizations by non-experts using physical elements) is a promising research area in a context of rapid democratization of data collection and visualization, driven notably by the quantified-self movement. Despite a prolific body of work developed to explore physicalization as a mean to communicate data to individuals, little is known about how people transform data into physical artefacts. Current research also falls short in studying constructive physicalizations using other sensory modalities than sight or touch. Building on the principles of data edibilization, we propose to use candies as a medium to study constructive data physicalization processes, due to their ability to leverage multiple sensory channels. We conducted a preliminary study (candy workshop) to gain insights into how people make use of various sensory modalities in the construction of data physicalizations. We hope to inspire new research using candies as accessible research material. [less ▲]

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See detailLe quotidien d’un poilu de la première guerre mondiale sur Facebook : nouvelle forme de médiation, nouvelle expérience ?
Schall, Céline UL; Vilatte, Jean-Christophe

in Les mondes de la médiation culturelle (in press)

« En 2013, le Musée de la Grande Guerre du Pays de Meaux et l’agence de communication DDB ont élaboré une page Facebook d’un genre nouveau. Facebook 1914, le quotidien de la première guerre offre une ... [more ▼]

« En 2013, le Musée de la Grande Guerre du Pays de Meaux et l’agence de communication DDB ont élaboré une page Facebook d’un genre nouveau. Facebook 1914, le quotidien de la première guerre offre une forme de médiation a priori inédite pour un musée français. Elle présente l’histoire d’un personnage de fiction, Léon Vivien, qui raconte son quotidien lors de la première guerre mondiale, sur Facebook, comme si ce réseau social avait existé à cette époque. Cette contribution met en évidence certains des effets de sens de la page par une analyse sémiotique du dispositif et une analyse thématique de ses contenus. Nous questionnons ensuite cette « nouvelle » forme de médiation qui se dit « participante » et qui, en réalité, reste assez classique dans son contenu et sous-exploite le potentiel de Facebook. » [less ▲]

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See detailWortverbindungen in Paraphrase und Argumentation: Eine Untersuchung an Lernendentexten von Studierenden mit L2 Deutsch
Huemer, Birgit UL

in Akten des XIV. Internationalen Germanistenkongresses. Palermo 2021. Wege der Germanistik in transkulturellen Perspektiven (in press)

In diesem Beitrag wird der Umgang mit wissenschaftssprachlichen Wortverbindungen in den beiden Textmustern Paraphrase und Argumentation von Texten luxemburgischer Studienanfänger der Germanistik mit L2 ... [more ▼]

In diesem Beitrag wird der Umgang mit wissenschaftssprachlichen Wortverbindungen in den beiden Textmustern Paraphrase und Argumentation von Texten luxemburgischer Studienanfänger der Germanistik mit L2 Deutsch genau unter die Lupe genommen. Dafür wird ein Korpus von 37 Lernendentexten nach korpuslinguistischen Kriterien aufbereitet und qualitativ analysiert. Es wird untersucht, welche Wortverbindungen für die beiden Textmuster typisch sind, welche Wortverbindungen bereits beherrscht werden und wo Schwierigkeiten auftreten. Die Untersuchung ergibt, dass die Verwendung von Wortverbindungen textmusterspezifisch ist. Die Fehleranalyse zeigt außerdem, dass von 195 verwendeten Wortverbindungen fast ein Drittel fehlerhaft sind. Dabei treten die größten Schwierigkeiten bei der Trennung zwischen Alltagssprache/Umgangssprache und Wissenschaftssprache auf. Als Maßnahmen für den Unterricht wird das Arbeiten mit Wortverbindungslisten, das selbstständige Ergänzen solcher Listen durch Analysen wissenschaftlicher Mustertexte, die Selbstkontrolle am Eigentext und das Arbeiten mit Korpora empfohlen. [less ▲]

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See detailLes archevêques de Milan face aux premières expériences seigneuriales: stratégies et positionnements (milieu XIIIe-début XIVe s.)
Salemme, Timothy UL

in Barralis, Christine (Ed.) L’évêque face à son métier. Actes du colloque international, Metz. 15-17 novembre 2017 (in press)

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See detailHyaku: A Qualitative Negotiation-Through-Interaction Interface to Support Runners in Achieving Balanced Training Sessions
Restrepo, Juan; Vos, Steven; Verhagen, Evert et al

Scientific Conference (in press)

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See detailOptimizing the Use of the Sentence Completion Survey Technique in User Research – A Case Study on the Experience of E-Reading
Lallemand, Carine UL; Mercier, Emeline

in Proceeding of the CHI 2022 Conference on Human Factors in Computing Systems (in press)

Sentence completion, originally a semi-projective psychological technique, has been used as an effective and lightweight user research method in user experience (UX) design. More information is yet still ... [more ▼]

Sentence completion, originally a semi-projective psychological technique, has been used as an effective and lightweight user research method in user experience (UX) design. More information is yet still needed to understand how different sentence stems probe users’ insights, thereby providing recommendations for effective sentence completion surveys. We used the completion method on a large-scale sample to explore (e-)readers’ experiences and needs. Depending on their reading habits, participants (N=1880) were asked to complete a set of sentences, as part of a web survey. With 14143 user ideas collected in two weeks, our results confirm that remote online sentence completion is a cost-effective data collection method able to uncover feelings, attitudes, motivations, needs, or frustrations. Variation in sentence stems affected collected data in terms of item response rate, idea quantity as well as variety and originality. Building on previous research, this paper delivers actionable insights to optimize the richness of sentence completion outputs. [less ▲]

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See detailAsynja: Sensorial Design for Running Motivation
Menheere, Daphne; Hilderink, Myrthe; Vos, Steven et al

in IASDR 2021: 9th Congress of the International Association of Societies of Design Research (in press)

If starting to run is an easy decision, committing to a long-term running routine proves to be a more challenging endeavor for many people. In this pictorial, we unravel the design process of Asynja, an ... [more ▼]

If starting to run is an easy decision, committing to a long-term running routine proves to be a more challenging endeavor for many people. In this pictorial, we unravel the design process of Asynja, an artefact that triggers exercise imagery by using natural scents related to running. Relying on peripheral interaction, this research probe subtly nudges users to go running, thereby supporting them to transform their positive intentions into actions. Exploring sensoriality as a design opportunity for behavior change interventions, we invite the community to expand the design space of exercise-related motivational products and systems. [less ▲]

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See detailConservazione e ricezione dei documenti pontifici in Italia settentrionale: il caso del monastero cistercense di Chiaravalle Milanese (secoli XII-XVI)
Salemme, Timothy UL

in Salemme, Timothy; Renault, Jean-Baptiste (Eds.) Conservation et réception des documents pontificaux par les Ordres religieux (XIe-XVe siècles). Actes du colloque international. Nancy, 12-13 décembre 2013 (in press)

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See detailA Methodology for Handling Data Movements by Anticipation: Position Paper
Bleuse, Raphaël UL; Lucarelli, Giorgio; Trystram, Denis

in Euro-Par 2018 Workshops (in press)

The enhanced capabilities of large scale parallel and distributed platforms produce a continuously increasing amount of data which have to be stored, exchanged and used by various tasks allocated on ... [more ▼]

The enhanced capabilities of large scale parallel and distributed platforms produce a continuously increasing amount of data which have to be stored, exchanged and used by various tasks allocated on different nodes of the system. The management of such a huge communication demand is crucial for reaching the best possible performance of the system. Meanwhile, we have to deal with more interferences as the trend is to use a single all-purpose interconnection network whatever the interconnect (tree-based hierarchies or topology-based heterarchies). There are two different types of communications, namely, the flows induced by data exchanges during the computations, and the flows related to Input/Output operations. We propose in this paper a general model for interference-aware scheduling, where explicit communications are replaced by external topological constraints. Specifically, the interferences of both communication types are reduced by adding geometric constraints on the allocation of tasks into machines. The proposed constraints reduce implicitly the data movements by restricting the set of possible allocations for each task. This methodology has been proved to be efficient in a recent study for a restricted interconnection network (a line/ring of processors which is an intermediate between a tree and higher dimensions grids/torus). The obtained results illustrated well the difficulty of the problem even on simple topologies, but also provided a pragmatic greedy solution, which was assessed to be efficient by simulations. We are currently extending this solution for more complex topologies. This work is a position paper which describes the methodology, it does not focus on the solving part. [less ▲]

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See detailGuidelines for Assessing the Accuracy of Log Message Template Identification Techniques
Khan, Zanis Ali UL; Shin, Donghwan UL; Bianculli, Domenico UL et al

in Proceedings of the 44th International Conference on Software Engineering (ICSE ’22) (in press)

Log message template identification aims to convert raw logs containing free-formed log messages into structured logs to be processed by automated log-based analysis, such as anomaly detection and model ... [more ▼]

Log message template identification aims to convert raw logs containing free-formed log messages into structured logs to be processed by automated log-based analysis, such as anomaly detection and model inference. While many techniques have been proposed in the literature, only two recent studies provide a comprehensive evaluation and comparison of the techniques using an established benchmark composed of real-world logs. Nevertheless, we argue that both studies have the following issues: (1) they used different accuracy metrics without comparison between them, (2) some ground-truth (oracle) templates are incorrect, and (3) the accuracy evaluation results do not provide any information regarding incorrectly identified templates. In this paper, we address the above issues by providing three guidelines for assessing the accuracy of log template identification techniques: (1) use appropriate accuracy metrics, (2) perform oracle template correction, and (3) perform analysis of incorrect templates. We then assess the application of such guidelines through a comprehensive evaluation of 14 existing template identification techniques on the established benchmark logs. Results show very different insights than existing studies and in particular a much less optimistic outlook on existing techniques. [less ▲]

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See detailLe dialogue entre les juges en matière de protection des droits de l'homme
Pelin Raducu, Ioana UL

in Menetrey, Séverine; Hess, Burkhard (Eds.) Les dialogues des juges en Europe (in press)

Dans cet article, nous allons mettre en exergue quelques aspects des arrêts récents provenant de la Cour de justice de l’UE (Akerberg Frasson, Melloni, Kamberaj)qui démontrent l’émergence d’un standard ... [more ▼]

Dans cet article, nous allons mettre en exergue quelques aspects des arrêts récents provenant de la Cour de justice de l’UE (Akerberg Frasson, Melloni, Kamberaj)qui démontrent l’émergence d’un standard propre de l’UE en matière des droits de l’homme. Cette tendance de la C.J.U.E. contredira le prescrit normatif découlant du « dialogue des juges » d’interprétation conforme à la jurisprudence de la C.E.D.H. avant que l’adhésion de l’UE à la Convention E.D.H. ne soit formellement acquise. [less ▲]

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See detailL’exposition d’objets ou de collections de « marque » : cobranding, réécriture, réénonciation
Schall, Céline UL

in Laval, Sylvie (Ed.) Marques muséales : un espace public revisité ? (in press)

Le cobranding est une pratique habituelle du secteur marchand. Mais lorsque deux musées réalisent ensemble une exposition, peut-on parler de cobranding muséal ? Quelles en seraient les spécificités  ... [more ▼]

Le cobranding est une pratique habituelle du secteur marchand. Mais lorsque deux musées réalisent ensemble une exposition, peut-on parler de cobranding muséal ? Quelles en seraient les spécificités ? Quels effets peut avoir cette démarche sur la communication ou sur l’exposition ? Notamment, le musée d’accueil s’approprie-t-il simplement l’imaginaire et les valeurs de la marque invitée par un phénomène de « transfert » ? Pour répondre à ces questions, nous étudions trois expositions qui reprennent des objets ou collections de musées dont la marque est internationalement reconnue. L’analyse sémiotique des images de marque du musée d’accueil et du musée invité ainsi que l’analyse sémiopragmatique des expositions montrent l’impact de la présence d’une grande marque internationale sur l’exposition et réciproquement, l’impact de l’exposition sur l’image de marque du musée d’accueil. Plus qu’un simple cobranding, c’est une réécriture impliquant une réénonciation du discours et des valeurs portés par les marques qui est proposée à travers ces expositions. Le processus aboutit à la création de nouveaux espaces symboliques et d’expositions réflexives, avec plusieurs niveaux de lecture. [less ▲]

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See detailVon Objekt- und Meta-Ebenen: Analyse der Softwareanforderungen computergestützter juristischer Entscheidungen
Adrian, Axel; Rapp, Max; Steen, Alexander UL

in Recht DIGITAL – 25 Jahre IRIS, Proceedings of the International Legal Informatics Symposium (IRIS 2022) (in press)

Die Interpretation und Anwendung von Gesetzestexten auf einem konkreten Lebenssachverhalt erfordert von menschlichen Experten ein hohes Maß an Wissen, Erfahrung und die Fähigkeit zahlreiche kontextuelle ... [more ▼]

Die Interpretation und Anwendung von Gesetzestexten auf einem konkreten Lebenssachverhalt erfordert von menschlichen Experten ein hohes Maß an Wissen, Erfahrung und die Fähigkeit zahlreiche kontextuelle Überlegungen anzustellen. Die Formalisierung und Automatisierung solch eines Prozesses in einem computergestützten Verfahren muss dies entsprechend reflektieren. Ausgehend von einer Fallstudie werden in dieser Arbeit erforderliche juridische Schritte der Rechtsanwendung identifiziert und verschiedenen Objekt- und Meta-Ebenen zugeordnet. Diese Zuordnung erlaubt eine abstrakte Analyse von Softwareanforderungen, die juristische Assistenzsysteme erfüllen müssen, um bei juristischen Fallentscheidungen unterstützen zu können. [less ▲]

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See detailEduCHI 2022 - 4th Annual Symposium on HCI Education
McDonald, Craig; St-Cyr, Olivier; Gray, Colin M. et al

in Proceedings of the CHI 2022 Conference on Human Factors in Computing Systems (in press)

EduCHI 2022 will bring together an international community of scholars, practitioners, and researchers to shape the future of Human-Computer Interaction (HCI) education. Held as part of the CHI 2022 ... [more ▼]

EduCHI 2022 will bring together an international community of scholars, practitioners, and researchers to shape the future of Human-Computer Interaction (HCI) education. Held as part of the CHI 2022 conference, the two-day symposium will feature in- teractive discussions about trends, curricula, pedagogies, teaching practices, and current and future challenges facing HCI educators. In addition to providing a platform to share curriculum plans and teaching materials, EduCHI 2022 will also provide opportunities for HCI educators to learn new instructional strategies and deepen their pedagogical knowledge. [less ▲]

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See detailHabilyzer: Empowering Office Workers to Investigate their Working Habits using an Open-Ended Sensor Kit
van Bussel, Tjeu; van den Heuvel, Roy; Lallemand, Carine UL

in Proceedings of the Extended Abstracts of the 2022 CHI Conference on Human Factors in Computing Systems (in press)

Office work presents health and wellbeing challenges, triggered by unhealthy working habits or environmental factors. While technologies for vitality in the office context gain popularity, they are often ... [more ▼]

Office work presents health and wellbeing challenges, triggered by unhealthy working habits or environmental factors. While technologies for vitality in the office context gain popularity, they are often solution-focused and fall short in acknowledging personal needs. Building on approaches from personal informatics, we see value in opening up the design space of tracking and sensing technologies for office workers. We designed and deployed an open-ended sensor kit and conducted two complementary studies to investigate the value of empowering office workers to investigate their own working habits. Findings show that Habilyzer triggers curiosity about working habits, and wireless sensors contribute to inquire into those habits, possibly supported by additional tools. We contribute new insights into how an open-ended sensor kit can be designed to support self-tracking practices and underlying reflections in the underexplored context of office work. It is an alternative approach to workplace vitality, moving from solution-oriented technologies to inquiry-enabling tools. [less ▲]

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See detailAndorra: eine Einherrschaft? Monarch: ein Einzelorgan? Der Verfall des Begriffsmerkmals „monos“ in Europas sogenannten „Monarchien“
Heuschling, Luc UL

in Gamper, Anna; Bussjäger, Peter (Eds.) 100 Jahre Verfassung des Fürstentums Liechtenstein. Konstitutionalismus im Kleinstaat (in press)

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See detailDiscrete-Phase Sequence Design with Stopband and PSL Constraints for Cognitive Radar
Alaeekerahroodi, Mohammad UL; Kumar, Sumit UL; Mysore Rama Rao, Bhavani Shankar UL et al

in Proceedings of EuRAD 2020 (in press)

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

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

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See detailBuffer XDEM
Mainassara Chekaraou, Abdoul Wahid UL; Besseron, Xavier UL; Rousset, Alban UL et al

Scientific Conference (in press)

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See detailTranslanguaging pedagogy and creative activism for early education in multilingual Luxembourg
Aleksic, Gabrijela UL

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 ▲]

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See detailRadio Regulation Compliance of NGSO Constellations’ Interference towards GSO Ground Stations
Jalali, Mahdis UL; Ortiz Gomez, Flor de Guadalupe UL; Lagunas, Eva UL et al

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 ▲]

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See detailObfuscating LLVM Intermediate Representation Source Code with NSGA-II
de la Torre, Juan Carlos; Aragó-Jurado, José Miguel; Jareño, Javier 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 ▲]

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See detailIndicators for assessing the necessity of power system flexibility: a systematic review and literature meta‐analysis
Bhuiyan, Rajon UL; Weissflog, Jan; Schoepf, Michael et al

Scientific Conference (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 ▲]

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See detailUnlinkability of an Improved Key Agreement Protocol for EMV 2nd Gen Payments
Horne, Ross James UL; Mauw, Sjouke UL; Yurkov, Semen UL

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 ▲]

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See detailSOniCS: Interfacing SOFA and FEniCS for advanced constitutive models
Mazier, Arnaud UL; El Hadramy, Sidaty; Brunet, Jean-Nicolas et al

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 ▲]

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See detailMultilingualism as Challenge for Luxembourgish Literary Historiography
Glesener, Jeanne UL

Scientific Conference (2022, July 29)

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See detailEtzels Vielvölkerhof – ein Modell europäisch vernetzter Herrschaft?
Bendheim, Amelie UL

Scientific Conference (2022, July 29)

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See detail"Mapping" biographies in relational databases - The case of Luxembourg soldiers in the Second World War
Janz, Nina UL

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 ▲]

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See detailHigh-Performance Computing for the simulation of particles with the Discrete Element Method
Besseron, Xavier UL

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 ▲]

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See detailTranslanguaging pedagogy and creative activism for preschool teachers, parents, and children
Aleksic, Gabrijela UL

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 ▲]

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See detailJewish History and the Politics of Digitisation
Zaagsma, Gerben UL

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 ▲]

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See detailIf there’s something strange in your [cyber]hood – who you gonna call?
Schmitz, Sandra UL

Scientific Conference (2022, July 07)

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See detailWhich Factors Play a Role in Coco Issuance? Evidence from European Banks.
Wolff, Christian UL

Scientific Conference (2022, July 06)

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See detailCentrality and city size effects on NO2 ground and tropospheric concentrations within European cities
Wei, Yufei UL; Caruso, Geoffrey UL; Lemoy, Rémi

Scientific Conference (2022, July 06)

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See detailTransatlantic Chattel Slavery, 1815–1888
Erpelding, Michel UL

in Lovall, Erin; Stefanelli, Justine (Eds.) Reparations Under International Law for Enslavement of African Persons in the Americas and the Caribbean: Proceedings of the Symposium, May 20–21, 2021 (2022, July 06)

This paper addresses the question of the legality and illegality of slavery-related practices during the 19th century under Western international law.

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See detailClimate Risk and Price Jumps
Lehnert, Thorsten UL

Scientific Conference (2022, July 05)

Detailed reference viewed: 55 (1 UL)
See detailEconomic Sanctions and International Investment Law: Investor and State Defences
Garcia Olmedo, Javier UL

Scientific Conference (2022, July 04)

This workshop examines the law and practice of economic sanctions in light of current developments in the Ukraine-Russia conflict. It explores the legality and implementation of, and possible challenges ... [more ▼]

This workshop examines the law and practice of economic sanctions in light of current developments in the Ukraine-Russia conflict. It explores the legality and implementation of, and possible challenges to, economic sanctions imposed by a number of international actors (including the US, the EU and the UK), as well as their potential impact on businesses and dispute resolution. [less ▲]

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See detailDIE GESANGSCHULE FÜR DIE "LITURGIE-SÄNGER" IM PREUßISCHEN MILITÄR VON J.D.C. EINBECK (BERLIN 1829)
Brusniak, Friedhelm; Sagrillo, Damien François UL; Heidler, Manfred

in Sagrillo, Damien François (Ed.) International Wind Music Conference, Bolzano 14-18 July 2022 (2022, July 01)

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See detailPourquoi les enseignants décident-ils de s'ouvrir aux familles ? résultats issus d'une consultation nationale au Grand-Duché du Luxembourg
Poncelet, Débora UL; Tinnes, Mélanie UL; Dierendonck, Christophe UL

Scientific Conference (2022, July 01)

En décembre 2021, une enquête, intitulée « Consultation des acteurs de l’école fondamentale. Une étude scientifique participative » a permis la collecte de données auprès des enseignants de l’école ... [more ▼]

En décembre 2021, une enquête, intitulée « Consultation des acteurs de l’école fondamentale. Une étude scientifique participative » a permis la collecte de données auprès des enseignants de l’école fondamentale et des éducateurs gradués. La thématique des relations école-famille a constitué un des aspects investigués dans l’étude. Depuis une vingtaine d’années, un intérêt croissant pour la thématique est observé. Une revue de la littérature récente (par exemple, Axford et al., 2019 ; Englund et al., 2004 ; Kim, Mok & Seidel, 2020, Roy & Giraldo-García, 2018 ; Huat See & Gorard, 2015), a montré à quel point les relations école-famille ainsi que l’engagement parental dans la scolarité de l’enfant pouvaient avoir une influence significative et positive à la fois sur les performances scolaires mais aussi sur des variables conatives (motivation scolaire, engagement ou adoption de comportements scolairement attendus). En outre, étant donné la grande diversité culturelle et socioéconomique des parents dont les enfants fréquentent l’école fondamentale comme la place accordée au partenariat avec les familles dans la loi scolaire, cette thématique est apparue comme incontournable pour le recueil de données. La théorie du comportement planifié (TCP) a été retenue comme un des modèles théorique et d’analyse des données collectées (voir exemple à ce sujet, Ajzen, 1991 ; Armitage et Conner, 2001). Ce modèle théorique vise à prédire et à expliquer un comportement au départ d’un processus cognitif et émotionnel incluant quatre éléments distincts : (1) les attitudes envers le comportement cible, (2) les normes subjectives en lien avec ce comportement, (3) le contrôle comportemental perçu et (4) l’intention d’adopter le comportement cible. Nous chercherons par conséquent à mettre en évidence l’intention des acteurs interrogés d’adopter des comportements propices à l’ouverture et à la communication envers les familles sur la base de leurs attitudes explicites. C’est ainsi que les conceptions et attitudes spécifiques, instrumentales comme affectives, ont été étudiées au départ de 6 items dont cinq sont originaux et un issu de l’instrument de Cárcamo-Vásquez & Rodríguez-Garcés (2015). En ce qui concerne les pratiques relatives à la relation école-famille, elles ont été observées par le biais de deux aspects : 1) la qualité des relations école-famille actuelles telles que perçues par les répondants (Vickers & Mincke, 1995 ; Dawson & Wymbs, 2016) et 2) les actions mises en œuvre pour susciter l’engagement des parents dans l’éducation scolaire de leur enfant soit à domicile, soit à l’école, soit par le biais des communications avec l’école (Hoover-Dempsey & Sandler, 2005 ; Manz, Fantuzzo & Power, 2004). Après avoir décrit la population interrogée et fournit des informations importantes sur le contexte de l’institution scolaire luxembourgeoise en matière d’hétérogénéité des publics, nous présenterons les premiers résultats de l’enquête en ce qui concerne la thématique des relations école-famille selon la théorie du comportement planifié. Bibliographie Ajzen, I. (1991). The theory of planned behavior. Organizational Behavior and Human Decision Processes, 50, 179–211. https://doi: 10.1016/0749-5978(91)90020-T Armitage, C. & Conner, M. (2001). Efficacy of the Theory of Planned Behaviour: A meta-analytic review. British Journal of Social Psychology, 40, 471-499. https://doi.org/10.1348/014466601164939 Axford, N., Berry, V., Lloyd, J., Moore, D., Rogers, M., Hurst, A., Blockley, K., Durkin,H. and Minton, J. (2019). How Can Schools Support Parents’ Engagement in their Children’s Learning? Evidence from Research and Practice. London: Education Endowment Foundation. Report available from: https://educationendowmentfoundation.org.uk/evidence-summaries/evidence-reviews/parental-engagement/ (retrieved February 2022). Cárcamo-Vásquez, H., Rodríguez-Garcés, C. (2015). Rol parental educativo: aproximación a las percepciones que poseen los futuros profesores. Educ., 18(3), 456-470. https://DOI: 10.5294/edu.2015.18.3.5 Dawson, A. E., & Wymbs, B. T. (2016). Validity and Utility of the Parent–Teacher Relationship Scale–II. Journal of Psychoeducational Assessment, 34(8), 751–764. https://doi.org/10.1177/0734282915627027   Englund, M. M., Luckner, A. E., Whaley, G. J. L., & Egeland, B. (2004). Children's Achievement in Early Elementary School: Longitudinal Effects of Parental Involvement, Expectations, and Quality of Assistance. Journal of Educational Psychology, 96(4), 723–730. https://doi.org/10.1037/0022-0663.96.4.723 Hoover-Dempsey, K.V., & Sandler, H.M. (2005). Final Performance Report for OERI Grant # R305T010673. The Social Context of Parental Involvement: A Path to Enhanced Achievement. Presented to Project Monitor, Institute of Education Sciences, U.S. Department of Education, March 22, 2005. Huat See, B., & Gorard, S. (2015). The role of parents in young people’s education—a critical review of the causal evidence. Oxford Review of Education, 41, 346-366. Kim, Y., Mok, S.Y., & Seidel, T. (2020). Parental influences on immigrant students' achievement-related motivation and achievement: A meta-analysis. Educational Research Review, 30, 1-19. https://doi.org/10.1016/j.edurev.2020.100327 Manz, P. H., Fantuzzo, J. W., & Power, T. J. (2004). Multidimensional assessment of family involvement among urban elementary students. Journal of School Psychology, 42(6), 461–475. https://doi.org/10.1016/j.jsp.2004.08.002 Roy, M., & Giraldo-García, R. (2018). The role of parental involvement and social/emotional skills in academic achievement: Global perspectives. The School Community Journal, 28(2), 29–46. Vickers, H. S., & Minke, K. M. (1995). Exploring parent-teacher relationships: Joining and communication to others. School Psychology Quarterly, 10(2), 133–150. https://doi.org/10.1037/h0088300 [less ▲]

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See detailAggregating and Consolidating two High Performant Network Topologies: The ULHPC Experience
Varrette, Sébastien UL; Cartiaux, Hyacinthe UL; Valette, Teddy UL et al

in ACM Practice and Experience in Advanced Research Computing (PEARC'22) (2022, July)

High Performance Computing (HPC) encompasses advanced computation over parallel processing. The execution time of a given simulation depends upon many factors, such as the number of CPU/GPU cores, their ... [more ▼]

High Performance Computing (HPC) encompasses advanced computation over parallel processing. The execution time of a given simulation depends upon many factors, such as the number of CPU/GPU cores, their utilisation factor and, of course, the inter- connect performance, efficiency, and scalability. In practice, this last component and the associated topology remains the most significant differentiators between HPC systems and lesser perfor- mant systems. The University of Luxembourg operates since 2007 a large academic HPC facility which remains one of the reference implementation within the country and offers a cutting-edge re- search infrastructure to Luxembourg public research. The main high-bandwidth low-latency network of the operated facility relies on the dominant interconnect technology in the HPC market i.e., Infiniband (IB) over a Fat-tree topology. It is complemented by an Ethernet-based network defined for management tasks, external access and interactions with user’s applications that do not support Infiniband natively. The recent acquisition of a new cutting-edge supercomputer Aion which was federated with the previous flag- ship cluster Iris was the occasion to aggregate and consolidate the two types of networks. This article depicts the architecture and the solutions designed to expand and consolidate the existing networks beyond their seminal capacity limits while keeping at best their Bisection bandwidth. At the IB level, and despite moving from a non-blocking configuration, the proposed approach defines a blocking topology maintaining the previous Fat-Tree height. The leaf connection capacity is more than tripled (moving from 216 to 672 end-points) while exhibiting very marginal penalties, i.e. less than 3% (resp. 0.3%) Read (resp. Write) bandwidth degradation against reference parallel I/O benchmarks, or a stable and sustain- able point-to-point bandwidth efficiency among all possible pairs of nodes (measured above 95.45% for bi-directional streams). With regards the Ethernet network, a novel 2-layer topology aiming for improving the availability, maintainability and scalability of the interconnect is described. It was deployed together with consistent network VLANs and subnets enforcing strict security policies via ACLs defined on the layer 3, offering isolated and secure net- work environments. The implemented approaches are applicable to a broad range of HPC infrastructures and thus may help other HPC centres to consolidate their own interconnect stacks when designing or expanding their network infrastructures. [less ▲]

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See detailPotentials of sector coupling to improve the resilience of electricity and gas networks
Leinauer, Christina; Hanny, Lisa; Bhuiyan, Rajon UL et al

Scientific Conference (2022, July)

Global warming leads to an increase in extreme weather events that considerably threaten critical infrastructures (e.g., electricity or gas networks). The failure of one critical infrastructure may have ... [more ▼]

Global warming leads to an increase in extreme weather events that considerably threaten critical infrastructures (e.g., electricity or gas networks). The failure of one critical infrastructure may have far-reaching consequences triggering a “cascade of failures” that affects other critical infrastructures. As extreme weather events usually hit affected regions unexpectedly, flexibility in energy systems is key to sustain resilience and rapidly respond to changing conditions, e.g., failed network lines. Hence, we analyze sector coupling (SC) as one option to increase flexibility and exploit synergies between electricity and gas networks. We investigate SC investments that allow for a bi-directional conversion of gas and electricity in the form of gas-fired power plants or power-to-X technologies and their effect on resilience. We propose a two-level market model where, in the upper-level problem, long-term investments in SC technologies are made in anticipation of short-term market clearing as well as uncertain failures and, in the lower-level problem, SC technologies may be activated. We model extreme weather events as a set of discrete scenarios that pose an external risk to the energy system. In our paper, we derive optimal SC investments representing a trade-off between enhancing system resilience and increasing investments. Moreover, we derive optimal SC responses for selected weather events to guide the operation of SC plants under extreme conditions. [less ▲]

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See detailTowards real-time patient-specific breast simulations: from full-field information to surrogate model
Mazier, Arnaud UL; Lavigne, Thomas UL; Lengiewicz, Jakub UL et al

Scientific Conference (2022, July)

In breast cancer treatment, surgery is one of the most common practices [DeSantis et al., 2019]. The surgery involves a complex pipeline, principally due to the difference between the imaging and the ... [more ▼]

In breast cancer treatment, surgery is one of the most common practices [DeSantis et al., 2019]. The surgery involves a complex pipeline, principally due to the difference between the imaging and the surgical posture [Mazier et al., 2021]. Indeed, because of the stance difference, the surgeon has to rely on radioactive or invasive markers to predict the tumor position in the surgical setup. Biomechanical simulations could predict such complex tumor displacements but often require patient-specific data (material properties, organs geometries, or loading and boundary conditions). Full-field acquisitions coupled with landmark identifications allow obtaining relative deformation between the different configurations. Having this information and assuming a finite element model, an identification procedure of the model parameters can be carried out. Finally, finding a suitable computational model allowing for a compromise between accuracy and speed, one may consider surrogate models for real-time simulations (20 to 50 FPS). In this work, we obtained the patient-specific geometry through micro-computed tomography in 8 different configurations, including 15 bio-markers. Assessing the displacement of the bio-markers enabled us to infer the relative strains between the different configurations. A heterogeneous neo-Hookean model was assumed for simulating soft tissue behavior. Based on the displacements and the position of the biomarkers, model parameters identification was performed to calibrate the experimental data with the finite element method results. To overcome speed performance issues, Convolutional Neural Network (CNN) trained with a synthetic simulation-based dataset generated by applying different gravity directions is used. Preliminary results show that CNN can predict the displacement of anatomical landmarks to millimetric precision and is 100 times faster than the finite element method, satisfying our real-time objective. Plus, the use of Bayesian inferences involves a longer prediction time but allows a 95% confidence interval of the biomarkers' displacements. For a given precision, contrary to CNNs, optimization methods are computationally expensive and depend on an initialization point. Although CNNs require new training for each patient, optimization algorithms can be applied regardless of the patient's geometry. Through this study, we observed that material properties were playing an essential role but not as much as the anatomical structures e.g. infra-mammary or Copper’s ligaments. [less ▲]

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See detailManagement of an Academic HPC Research Computing Facility: The ULHPC Experience 2.0
Varrette, Sébastien UL; Cartiaux, Hyacinthe UL; Peter, Sarah UL et al

in 6th High Performance Computing and Cluster Technologies Conference (HPCCT 2022) (2022, July)

With the advent of the technological revolution and the digital transformation that made all scientific disciplines becoming computational, the need for High Performance Computing (HPC) has become and a ... [more ▼]

With the advent of the technological revolution and the digital transformation that made all scientific disciplines becoming computational, the need for High Performance Computing (HPC) has become and a strategic and critical asset to leverage new research and business in all domains requiring computing and storage performance. Since 2007, the University of Luxembourg operates a large academic HPC facility which remains the reference implementation within the country. This paper provides a general description of the current platform implementation as well as its operational management choices which have been adapted to the integration of a new liquid-cooled supercomputer, named Aion, released in 2021. The administration of a HPC facility to provide state-of-art computing systems, storage and software is indeed a complex and dynamic enterprise with the soul purpose to offer an enhanced user experience for intensive research computing and large-scale analytic workflows. Most design choices and feedback described in this work have been motivated by several years of experience in addressing in a flexible and convenient way the heterogeneous needs inherent to an academic environment towards research excellence. The different layers and stacks used within the operated facilities are reviewed, in particular with regards the user software management, or the adaptation of the Slurm Resource and Job Management System (RJMS) configuration with novel incentives mechanisms. In practice, the described and implemented environment brought concrete and measurable improvements with regards the platform utilization (+12,64%), jobs efficiency (average Wall-time Request Accuracy improved by 110,81%), the management and funding (increased by 10%). Thorough performance evaluation of the facility is also presented in this paper through reference benchmarks such as HPL, HPCG, Graph500, IOR or IO500. It reveals sustainable and scalable performance comparable to the most powerful supercomputers in the world, including for energy-efficient metrics (for instance, 5,19 GFlops/W (resp. 6,14 MTEPS/W) were demonstrated for full HPL (resp. Graph500) runs across all Aion nodes). [less ▲]

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See detailAutonomous control for satellite rendezvous in near-Earth orbits
Muralidharan, Vivek UL; Martinez Luna, Carol UL; Zinys, Augustinas et al

Scientific Conference (2022, July)

CubeSats are being deployed for a number of activities including Earth observation, telecommunications, scientific experiments, and due to their low cost and flexibility, more often than not, they are ... [more ▼]

CubeSats are being deployed for a number of activities including Earth observation, telecommunications, scientific experiments, and due to their low cost and flexibility, more often than not, they are even being considered for use in On-Orbit Servicing (OOS) and debris removal missions. This investigation focuses on using the CubeSat technology to perform autonomous proximity operations with passive target bodies including satellites or space debris. The nonlinear coupled attitude and orbit dynamics for the chaser and the target bodies are modelled and simulated. A nonlinear optimal controller identifies an appropriate rendezvous path. A vision-based navigation system on the chaser satellite records the pose of the target body. The pose observations with stochastic uncertainties are processed using a Kalman filter, and offer state feedback along the satellite path. Such observations in conjunction with the postulated linear control algorithm anchor the chaser to approach the target by maintaining appropriate relative configuration. The linear controller delivers regular maneuvers to compensate for any deviations from the identified reference path. A close-range rendezvous operation is illustrated in a Mission Design Simulator (MDS) tool. [less ▲]

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See detailOptimizing the Resource and Job Management System of an Academic HPC and Research Computing Facility
Varrette, Sébastien UL; Kieffer, Emmanuel UL; Pinel, Frederic

in 21st IEEE Intl. Symp. on Parallel and Distributed Computing (ISPDC'22) (2022, July)

High Performance Computing (HPC) is nowadays a strategic asset required to sustain the surging demands for massive processing and data-analytic capabilities. In practice, the effective management of such ... [more ▼]

High Performance Computing (HPC) is nowadays a strategic asset required to sustain the surging demands for massive processing and data-analytic capabilities. In practice, the effective management of such large scale and distributed computing infrastructures is left to a Resource and Job Management System (RJMS). This essential middleware component is responsible for managing the computing resources, handling user requests to allocate resources while providing an optimized framework for starting, executing and monitoring jobs on the allocated resources. The University of Luxembourg has been operating for 15 years a large academic HPC facility which relies since 2017 on the Slurm RJMS introduced on top of the flagship cluster Iris. The acquisition of a new liquid-cooled supercomputer named Aion which was released in 2021 was the occasion to deeply review and optimize the seminal Slurm configuration, the resource limits defined and the sustaining fairsharing algorithm. This paper presents the outcomes of this study and details the implemented RJMS policy. The impact of the decisions made over the supercomputers workloads is also described. In particular, the performance evaluation conducted highlights that when compared to the seminal configuration, the described and implemented environment brought concrete and measurable improvements with regards the platform utilization (+12.64%), the jobs efficiency (as measured by the average Wall-time Request Accuracy, improved by 110.81%) or the management and funding (increased by 10%). The systems demonstrated sustainable and scalable HPC performances, and this effort has led to a negligible penalty on the average slowdown metric (response time normalized by runtime), which was increased by 0.59% for job workloads covering a complete year of exercise. Overall, this new setup has been in production for 18 months on both supercomputers and the updated model proves to bring a fairer and more satisfying experience to the end users. The proposed configurations and policies may help other HPC centres when designing or improving the RJMS sustaining the job scheduling strategy at the advent of computing capacity expansions. [less ▲]

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See detailA comparative study of automatic classifiers to recognize speakers based on fricatives
Hosseini Kivanani, Nina UL; Asadi, Homa; Schommer, Christoph UL et al

Poster (2022, July)

Speakers’ voices are highly individual and for this reason speakers can be identified based on their voice. Nevertheless, voices are often more variable within the same speaker than they are between ... [more ▼]

Speakers’ voices are highly individual and for this reason speakers can be identified based on their voice. Nevertheless, voices are often more variable within the same speaker than they are between speakers, which makes it difficult for humans and machines to differentiate between speakers (Hansen, J. H., & Hasan, T., 2015). To date, various machine learning methods have been developed to recognize speakers based on the acoustic characteristics of their speech; however, not all of them have proven equally effective in speaker identification, and depending on the obtained techniques, the system achieves a different result. Here, different machine learning classifiers have been applied to identify the best classification model (i.e., Naïve Bayes (NB), support vector machines (SVM), random forests (RF), & k-nearest neighbors (KNN)) for categorizing 4 speaking styles based on the segment types (voiceless fricatives) considering acoustic features of center of gravity, standard deviation, and skewness. We used a dataset consisting of speech samples from 7 native Persian subjects speaking in 4 different speaking styles: read, spontaneous, clear, and child-directed speech. The results revealed that the best performing model to predict the speakers based on the segment type was RF model with an accuracy of 81,3%, followed by SVM (76.3%), NB (75.4%), and KNN (74%) (Table 1). Our results showed that the RF performed the best for voiceless fricatives /f/, /s/, and / ʃ / which may indicate that these segments are much more speaker-specific than others (Gordon et al., 2002), and the model performance was low for the voiceless fricatives of /h/ and /x/. Performance can be seen in the confusion matrix (Figure 1), which produced high precision and recall values (above 80%) for /f/, /s/ and / ʃ / (Table 2). We found that the model performance improved when the data related to clear speaking style; the information in individual speakers (i.e., voiceless fricatives) are more distinguishable in clear style than other styles (Table 1). [less ▲]

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See detailParallel Multi-Physics Simulation of Biomass Furnace and Cloud-based Workflow for SMEs
Besseron, Xavier UL; Rusche, Henrik; Peters, Bernhard UL

in Practice and Experience in Advanced Research Computing (PEARC '22) (2022, July)

Biomass combustion is a well-established process to produce energy that offers a credible alternative to reduce the consumption of fossil fuel. To optimize the process of biomass combustion, numerical ... [more ▼]

Biomass combustion is a well-established process to produce energy that offers a credible alternative to reduce the consumption of fossil fuel. To optimize the process of biomass combustion, numerical simulation is a less expensive and time-effective approach than the experimental method. However, biomass combustion involves intricate physical phenomena that must be modeled (and validated) carefully, in the fuel bed and in the surrounding gas. With this level of complexity, these simulations require the use of High-Performance Computing (HPC) platforms and expertise, which are usually not affordable for manufacturing SMEs. In this work, we developed a parallel simulation tool for the simulation of biomass furnaces that relies on a parallel coupling between Computation Fluid Dynamics (CFD) and Discrete Element Method (DEM). This approach is computation-intensive but provides accurate and detailed results for biomass combustion with a moving fuel bed. Our implementation combines FOAM-extend (for the gas phase) parallelized with MPI, and XDEM (for the solid particles) parallelized with OpenMP, to take advantage of HPC hardware. We also carry out a thorough performance evaluation of our implementation using an industrial biomass furnace setup. Additionally, we present a fully automated workflow that handles all steps from the user input to the analysis of the results. Hundreds of parameters can be modified, including the furnace geometry and fuel settings. The workflow prepares the simulation input, delegates the computing-intensive simulation to an HPC platform, and collects the results. Our solution is integrated into the Digital Marketplace of the CloudiFacturing EU project and is directly available to SMEs via a Cloud portal. As a result, we provide a cutting-edge simulation of a biomass furnace running on HPC. With this tool, we demonstrate how HPC can benefit engineering and manufacturing SMEs, and empower them to compute and solve problems that cannot be tackled without. [less ▲]

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See detailLe travail frontalier "à distance" : les enjeux du télétravail et des espaces de coworking dans un espace transfrontalier
Pigeron-Piroth, Isabelle UL; Belkacem, Rachid

Scientific Conference (2022, June 30)

The objective of this paper is to identify the economic and social challenges of telework in the context of a cross-border labor market : Greater Region SaarLorLux, a cross-border area including ... [more ▼]

The objective of this paper is to identify the economic and social challenges of telework in the context of a cross-border labor market : Greater Region SaarLorLux, a cross-border area including Luxembourg, Lorraine (in France), Saarland and Rhineland Palatinate (in Germany) and Wallonia (in Belgium). This area is strongly concerned by the flows of border workers (nearly 260,000 in 2021). Teleworking has been imposed by the pandemic and is not without raising a certain number of questions: legal, social, fiscal.... linked to the presence of the border between the place of residence and the place of work. In a context of mobility and congestion problems, another form of remote work has developed in recent years : coworking spaces. This paper aims to discuss these two organizational modalities of teleworking, but also their challenges for the development of the border territories of both residence and work. [less ▲]

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See detailWeb archives of the COVID-crisis : challenges related to short-term and long-term readability
Schafer, Valerie UL

Scientific Conference (2022, June 29)

During the COVID-19 crisis many institutions have started live and special collections related to web archives of the pandemic. Many libraries have also been involved in an initiative led by the IIPC ... [more ▼]

During the COVID-19 crisis many institutions have started live and special collections related to web archives of the pandemic. Many libraries have also been involved in an initiative led by the IIPC (International Internet Preservation Consortium) to gather a huge international collection of web archives available through Archive-It. Taking as a starting point two research projects related to the analysis of the web archiving of the COVID crisis, that we conducted within WARCnet and through the AWAC2 cohort program, this presentation will focus on issues related to scalable reading, contextualization of datasets, FAIR data, sustainability, inclusiveness, etc., in order to unfold the challenges of these collections and of their analysis in a short and in a long term perspective. [less ▲]

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See detailDemocracy and the digital revolution – steering an evolving paradigm
Danescu, Elena UL

Scientific Conference (2022, June 29)

Knowledge-based societies rely to a large extent on intangible assets and digital technologies, and these are having an increasing impact on information systems, power, governance and citizenship, driven ... [more ▼]

Knowledge-based societies rely to a large extent on intangible assets and digital technologies, and these are having an increasing impact on information systems, power, governance and citizenship, driven by a proliferation of stakeholders and networks at multiple levels (states, international organisations, private companies, civil society and citizens. There is a clear need for international regulation in this area. This paper takes a multidisciplinary approach, combining an examination of theoretical, conceptual and methodological frameworks with an analysis of relevant public and private archives, with a threefold objective: 1) to outline issues and challenges in terms of human rights, freedom and democracy; 2) to identify the regulatory provisions adopted at European and international level to promote accountability, civic engagement and digital literacy through new forms of (mediated) democracy; and 3) to identify future prospects, risks and uncertainties in the era of artificial intelligence. [less ▲]

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See detailFrom Graphs to the Science Computer of a Space Telescope. The power of Petri Nets in Systems Engineering
Graczyk, Rafal UL; Bujwan, Waldemar; Darmetko, Marcin et al

in Graczyk, Rafal; Bujwan, Waldemar; Darmetko, Marcin (Eds.) et al From Graphs to the Science Computer of a Space Telescope. The power of Petri Nets in Systems Engineering (2022, June 23)

Space system engineering has to follow a rigorous design process to manage performance/risk trade-offs at each development stage and possibly across several functional and organizational domains. The ... [more ▼]

Space system engineering has to follow a rigorous design process to manage performance/risk trade-offs at each development stage and possibly across several functional and organizational domains. The process is further complicated by the co-development of multiple solutions, each contributing differently to the goal and with different tradeoffs. Moreover, the design process is iterative, involving both changing requirements and specifications along the different ways that lead to the set goal of the mission. The above requires rigorous modeling that, in addition, must be easily extendible and maintainable across organizational units. On the example of the PROBA-3 science computer (instrument control unit, CCB DPU), we show how Petri Nets can serve as such a simple-to-maintain, holistic model, combining finite-state characterizations with dynamic system behavior caused by hardware-software interactions, to express the component-state dependent end-to-end performance characteristics of the system. The paper elaborates on how the proposed Petri-Net modeling scheme allows for system architecture optimization that result in safely reduced technical margins and in turn substantial savings in components costs. We show that performance metrics, obtained from simulation, correlate well with the real performance characteristics of the flight model of PROBA-3's science computer. [less ▲]

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See detailWhich Factors Play a Role in Coco Issuance? Evidence from European Banks.
Wolff, Christian UL

Scientific Conference (2022, June 20)

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See detailBackscatter-Aided NOMA V2X Communication under Channel Estimation Errors
Khan, Wali Ullah UL; Jamshed, Muhammad Ali; Mahmood, Asad UL et al

Scientific Conference (2022, June 20)

Backscatter communications (BC) has emerged as a promising technology for providing low-powered transmissions in nextG (i.e., beyond 5G) wireless networks. The fundamental idea of BC is the possibility of ... [more ▼]

Backscatter communications (BC) has emerged as a promising technology for providing low-powered transmissions in nextG (i.e., beyond 5G) wireless networks. The fundamental idea of BC is the possibility of communications among wireless devices by using the existing ambient radio frequency signals. Non-orthogonal multiple access (NOMA) has recently attracted significant attention due to its high spectral efficiency and massive connectivity. This paper proposes a new optimization framework to minimize total transmit power of BC-NOMA cooperative vehicle-to-everything networks (V2XneT) while ensuring the quality of services. More specifically, the base station (BS) transmits a superimposed signal to its associated roadside units (RSUs) in the first time slot. Then the RSUs transmit the superimposed signal to their serving vehicles in the second time slot exploiting decode and forward protocol. A backscatter device (BD) in the coverage area of RSU also receives the superimposed signal and reflect it towards vehicles by modulating own information. Thus, the objective is to simultaneously optimize the transmit power of BS and RSUs along with reflection coefficient of BDs under perfect and imperfect channel state information. The problem of energy efficiency is formulated as non-convex and coupled on multiple optimization variables which makes it very complex and hard to solve. Therefore, we first transform and decouple the original problem into two sub-problems and then employ iterative sub-gradient method to obtain an efficient solution. Simulation results demonstrate that the proposed BC-NOMA V2XneT provides high energy efficiency than the conventional NOMA V2XneT without BC. [less ▲]

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See detailArea-Power Analysis of FFT Based Digital Beamforming for GEO, MEO, and LEO Scenarios
Palisetty, Rakesh UL; Eappen, Geoffrey UL; Gonzalez Rios, Jorge Luis UL et al

Scientific Conference (2022, June 19)

Satellite communication systems can provide seamless wireless coverage directly or through complementary ground terrestrial components and are projected to be incorporated into future wireless networks ... [more ▼]

Satellite communication systems can provide seamless wireless coverage directly or through complementary ground terrestrial components and are projected to be incorporated into future wireless networks, particularly 5G and beyond networks. Increased capacity and flexibility in telecom satellite payloads based on classic radio frequency technology have traditionally translated into increased power consumption and dissipation. Much of the analog hardware in a satellite communications payload can be replaced with highly integrated digital components that are often smaller, lighter, and less expensive, as well as software reprogrammable. Digital beamforming of thousands of beams simultaneously is not practical due to the limited power available onboard satellite processors. Reduced digital beamforming power consumption would enable the deployment of a full digital payload, resulting in comprehensive user applications. Beamforming can be implemented using matrix multiplication, hybrid methodology, or a discrete Fourier transform (DFT). Implementing DFT via fast Fourier transform (FFT) reduces the power consumption, process time, hardware requirements, and chip area. Therefore, in this paper, area-power efficient FFT architectures for digital beamforming are analyzed. The area in terms of look up tables (LUTs) is estimated and compared among conventional FFT, fully unrolled FFT, and a 4-bit quantized twiddle factor (TF) FFT. Further, for the typical satellite scenarios, area, and power estimation are reported. [less ▲]

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See detailWhen RIS Meets GEO Satellite Communications: A New Sustainable Optimization Framework in 6G
Khan, Wali Ullah UL; Lagunas, Eva UL; Mahmood, Asad UL et al

Scientific Conference (2022, June 19)

Reflecting intelligent surfaces (RIS) is a low-cost and energy-efficient solution to achieve high spectral efficiency in sixth-generation (6G) networks. The basic idea of RIS is to smartly reconfigure the ... [more ▼]

Reflecting intelligent surfaces (RIS) is a low-cost and energy-efficient solution to achieve high spectral efficiency in sixth-generation (6G) networks. The basic idea of RIS is to smartly reconfigure the signal propagation by using passive reflecting elements. On the other side, the demand of high throughput geostationary (GEO) satellite communications (SatCom) is rapidly growing to deliver broadband services in inaccessible/insufficient covered areas of terrestrial networks. This paper proposes a GEO SatCom network, where a satellite transmits the signal to a ground mobile terminal using multicarrier communications. To enhance the effective gain, the signal delivery from satellite to the ground mobile terminal is also assisted by RIS which smartly shift the phase of the signal towards ground terminal. We consider that RIS is mounted on a high building and equipped with multiple re-configurable passive elements along with smart controller. We jointly optimize the power allocation and phase shift design to maximize the channel capacity of the system. The joint optimization problem is formulated as nonconvex due to coupled variables which is hard to solve through traditional convex optimization methods. Thus, we propose a new optimal algorithm which is based on Mesh Adaptive Direct Search to obtain an efficient solution. Simulation results unveil the benefits of RIS-assisted SatCom in terms of system channel capacity. [less ▲]

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See detailJewish History and the Politics of Digitisation
Zaagsma, Gerben UL

Scientific Conference (2022, June 17)

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See detailEconomic Ideas and Political Action in Shaping Economic and Monetary Union: Pierre Werner and Luxembourg
Danescu, Elena UL

Scientific Conference (2022, June 16)

The international financial centre in Luxembourg grew considerably in the 1960s, driven by proactive government policy, flexible regulation, a willingness to harness external opportunities and the ... [more ▼]

The international financial centre in Luxembourg grew considerably in the 1960s, driven by proactive government policy, flexible regulation, a willingness to harness external opportunities and the establishment of Community institutions and European funding institutions in the country. As Luxembourg was in a currency union with Belgium within the Belgium-Luxembourg Economic Union and did not have its own Central Bank, these developments were all the more meaningful. When the European integration process experienced a series of major crises – including the failure of the European Defence Community and European Political Community in 1954, the empty chair crisis in 1966 and General de Gaulle’s veto on British accession in 1962 and 1967 –, Luxembourg set out on the path of European monetary integration, under the impetus of Finance Minister and Prime Minister Pierre Werner. In October 1970, the Werner Report provided a detailed blueprint for Economic and Monetary Union and laid the foundations for the euro. The Luxembourg financial centre would serve as a “laboratory” for the future single currency. This paper makes extensive use of relevant European and international archives and original interviews, adopting an interdisciplinary approach to analyse Luxembourg’s leading role in reconciling different views on EMU and fostering political commitment to a European currency among the Member States. [less ▲]

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See detail3D Digital Heritage and Historical Storytelling: Outcomes from the Interreg EMR Terra Mosana Project
van Ruymbeke, Muriel UL; Nofal, Eslam; Billen, Roland

in Rauterberg, Matthias (Ed.) Culture and Computing (2022, June 16)

The paper explains how the activities undertaken in the Terra Mosana project have combined the writing of new heritage narratives with the creation of digital 3D virtual experiences. The main objective of ... [more ▼]

The paper explains how the activities undertaken in the Terra Mosana project have combined the writing of new heritage narratives with the creation of digital 3D virtual experiences. The main objective of the project was to strengthen the sense of belonging to the same community for the citizens of the Euregio Meuse-Rhine by recreating their common history and heritage in 3D. This was achieved through virtual and augmented reality experiences based on cross-border and renewed historical storylines. [less ▲]

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See detailStudying transnational events through web archives
Schafer, Valerie UL

Scientific Conference (2022, June 13)

This presentation was an update of the work of WG2 related to web archives and transnational events I'm leading within the WARCnet project.

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See detailClimate Risk and Price Jumps
Lehnert, Thorsten UL

Scientific Conference (2022, June 13)

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See detailWhen Cryptographic Ransomware Poses Cyber Threats: Ethical Challenges and Proposed Safeguards for Cybersecurity Researchers
Botes, Wilhelmina Maria UL; Lenzini, Gabriele UL

Scientific Conference (2022, June 10)

Cryptographic ransomware, a malware capable of destroying data, is a serious threat if used against providers of critical infrastructures such as healthcare, energy supply chains, banking services, and ... [more ▼]

Cryptographic ransomware, a malware capable of destroying data, is a serious threat if used against providers of critical infrastructures such as healthcare, energy supply chains, banking services, and transport systems. Used as such, ransomware may qualify as cyber weapon, but the current discussion around cyber and information warfare is not sufficiently legally regulated. This delegates the safe governance thereof to the application of ethical principles but leaves researchers working on ransomware in doubt about the double-use nature of their work and what code of conduct to follow. Although some existing biomedical research ethical principles have been repurposed for ICT research, in the context of recent threats posed by ransomware attacks, these efforts need an urgent rethink, especially when it involves the research of cybersecurity researchers dealing specifically with ransomware. This paper does not offer solutions, but rather describes the complexity, nature and extent of ethical challenges raised by cybersecurity research and invites the cybersecurity research community to enter into active discussions around the need to consider the development of an appropriate research ethics framework in the domain of cybersecurity. [less ▲]

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See detailUnsupervised Learning for User Scheduling in Multibeam Precoded GEO Satellite Systems
Ortiz Gomez, Flor de Guadalupe UL; Lagunas, Eva UL; Chatzinotas, Symeon UL

Scientific Conference (2022, June 09)

Future generation SatCom multibeam architectures will extensively exploit full-frequency reuse schemes together with interference management techniques, such as precoding, to dramatically increase ... [more ▼]

Future generation SatCom multibeam architectures will extensively exploit full-frequency reuse schemes together with interference management techniques, such as precoding, to dramatically increase spectral efficiency performance. Precoding is very sensitive to user scheduling, suggesting a joint precoding and user scheduling design to achieve optimal performance. However, the joint design requires solving a highly complex optimization problem which is unreasonable for practical systems. Even for suboptimal disjoint scheduling designs, the complexity is still significant. To achieve a good compromise between performance and complexity, we investigate the applicability of Machine Learning (ML) for the aforementioned problem. We propose three clustering algorithms based on Unsupervised Learning (UL) that facilitate the user scheduling decisions while maximizing the system performance in terms of throughput. Numerical simulations compare the three proposed algorithms (K-means, Hierarchical clustering, and Self-Organization) with the conventional geographic scheduling and identify the main trade-offs. [less ▲]

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See detailA survey of EMI lecturer training programmes: content, delivery, ways forward.
Deroey, Katrien UL

Scientific Conference (2022, June 09)

This talk will provide insights into designing and delivering English Medium Instruction (EMI) lecturer training by surveying published initiatives worldwide (Deroey, 2021). Although EMI is not a recent ... [more ▼]

This talk will provide insights into designing and delivering English Medium Instruction (EMI) lecturer training by surveying published initiatives worldwide (Deroey, 2021). Although EMI is not a recent phenomenon, many higher education institutions are only now beginning to organize specific support for EMI lecturers. EAP practitioners are often tasked with providing such support, since the perception commonly is that language is the main issue requiring improvement. However, the efficient design and delivery of EMI lecturing training and support is a complex challenge. First, most literature highlights the need for pedagogical and communication training in addition to language work. Second the varied EMI context means training should be adapted to the local cultural, educational, linguistic and institutional contexts (Herington, 2020; Martinez & Fernandes, 2020; Tuomainen, 2018). Third, we need to be sensitive to lecturers’ attitudes towards EMI and EMI training (Tsui, 2018). Fourth, there are practical considerations such as the timely provision of support (Guarda & Helm, 2017); promoting participation; facilitating learning transfer to lectures; and working with what are usually heterogeneous participant groups in terms of English proficiency, (EMI) lecturing experience and discipline (Ball & Lindsay, 2013). Finally, the design of these programmes typically needs to happen with very limited institutional resources, few (if any) published materials and relatively little published research on lecture discourse and EMI lecturer training. Having surveyed the main components, formats and work forms of the programmes, the conclusion highlights ways forward in EMI lecturer training that emerge from this analysis. References Ball, P., & Lindsay, D. (2013). Language demands and support for English-medium instruction in tertiary education. Learning from a specific context In A. Doiz, D. Lasagabaster, & J. M. Sierra (Eds.), English-medium instruction at universities: Global challenges (pp. 44-61). Multilingual Matters. Deroey, K. L. B. (2021). Lecturer training for English Medium Instruction: what and how? In B. D. Bond, A. & M. Evans (Ed.), Innovation, exploration and transformation. Proceedings of the 2019 BALEAP Conference (pp. 245-253). Garnet. Guarda, M., & Helm, F. (2017). A survey of lecturers’ needs and feedback on EMI training. In K. Ackerley, M. Guarda, & F. Helm (Eds.), Sharing perspectives on English-medium instruction (pp. 167-194). Peter Lang. Herington, R. (2020). Observation as a tool to facilitate the professional development of teaching faculty involved in English as a Medium of Instruction: trainer and trainee perspectives. In M. L. Carrió-Pasto (Ed.), Internationalising Learning in Higher Education (pp. 65-82). IGI Global. Martinez, R., & Fernandes, K. (2020). Development of a teacher training course for English medium instruction for higher education professors in Brazil. In M. Del Mar Sánchez-Pérez (Ed.), Teacher Training for English-Medium Instruction in Higher Education (pp. 125-152). IGI Global. Tuomainen, S. (2018). Supporting non-native university lecturers with English-medium instruction. Journal of Applied Research in Higher Education, 10(3), 230-242. [less ▲]

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See detailTélétravail et mobilités dans un contexte transfrontalier
Pigeron-Piroth, Isabelle UL

Scientific Conference (2022, June 09)

La Grande Région SaarLorLux se caractérise par d’intenses flux de travailleurs frontaliers qui représentent près d’un quart des flux de travail frontalier de l’ensemble de l’UE. La pandémie de Covid-19 et ... [more ▼]

La Grande Région SaarLorLux se caractérise par d’intenses flux de travailleurs frontaliers qui représentent près d’un quart des flux de travail frontalier de l’ensemble de l’UE. La pandémie de Covid-19 et le confinement total débuté en mars 2020 ont eu pour conséquence de développer le recours massif au télétravail y compris dans cet espace traversé par plusieurs frontières. Cette plongée brutale et soudaine dans le télétravail a attiré l’attention sur cette forme d’organisation du travail, assez peu utilisée et étudiée jusqu’alors. La question se pose désormais de voir comment va évoluer cette forme de travail dans un contexte transfrontalier, compte tenu des multiples règlementations en vigueur (fiscales, sécurité sociale…), par ailleurs diverses selon les pays concernés (de travail comme de résidence). Le débat a notamment été relancé avec la récente résolution européenne déposée à l’Assemblée Nationale française visant à l’augmentation du télétravail des travailleurs frontaliers et à mener une réflexion européenne sur leur statut (texte adopté n°819). Il importe alors de tenir compte des effets du télétravail sur les travailleurs frontaliers en place mais aussi sur les évolutions du travail frontalier. Doit-on s’attendre à une forte hausse du travail frontalier si le télétravail se généralise ? Comment seront alors impactées les mobilités des frontaliers ? L’objectif de la présente communication est de dresser une liste des effets potentiels du télétravail sur les mobilités (quotidiennes et résidentielles) dans un contexte transfrontalier. Comment le télétravail peut-il impacter les pratiques de mobilités des frontaliers ? constitue-t-il une solution envisageable et réaliste face aux problèmes de congestion autour du Luxembourg ? ou y a-t-il des effets-rebonds qui nuanceraient cet impact du télétravail sur les mobilités? Autant de questions qui constituent une étape préliminaire avant toute tentative de mesure ou de prise en compte de l’effet télétravail dans l’analyse du marché du travail transfrontalier dans la Grande Région. Méthodologie En partant d’une analyse de la littérature sur le sujet, souvent abordé de manière « nationale » donc sans tenir compte des particularités liées aux frontières, nous complèterons ce tour d’horizon par nos propres travaux sur la question et notre connaissance du contexte transfrontalier. Principaux résultats obtenus ou attendus Une réflexion générale sera engagée quant aux effets attendus du télétravail sur les mobilités transfrontalières, à la fois au niveau macro, meso et micro. Il importera de distinguer les impacts sur les travailleurs frontaliers déjà en place et sur ceux qui sont potentiellement candidats à un emploi transfrontalier, mais aussi de tenir compte du fait que tous les emplois ne sont pas télétravaillables par exemple (selon le secteur ou le type d’emploi). Cet inventaire détaillé nous permettra de conclure sur l’intérêt de la prise en compte de la variable télétravail dans les futures analyses du travail frontalier, mais également nous fournira des pistes d’études concrètes à réaliser. [less ▲]

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See detailHEAT AND MASS TRANSFER BETWEEN XDEM & OPENFOAM USING PRECICE COUPLING LIBRARY
Adhav, Prasad UL; Besseron, Xavier UL; Estupinan Donoso, Alvaro Antonio UL et al

Scientific Conference (2022, June 09)

This work demonstrates the rapid development of a simulation environment to achieve Heat and Mass Transfer (HMT) between Discrete Element Methods (DEM) and Computa- tional Fluid Dynamics (CFD). The HMT ... [more ▼]

This work demonstrates the rapid development of a simulation environment to achieve Heat and Mass Transfer (HMT) between Discrete Element Methods (DEM) and Computa- tional Fluid Dynamics (CFD). The HMT coupling can be employed to simulate processes such as drying, pyrolysis, combustion, melting, solid-fluid reactions etc and have indus- trial applications such as biomass furnaces, boilers, heat exchangers, and flow through packed beds. This shows that diverse CFD features and solvers need to be coupled with DEM in order to achieve various applications mentioned above. The proposed DEM-CFD Eulerian-Lagrangian coupling for heat and mass transfer is achieved by employing the preCICE coupling library[1] on volumetric meshes. In our prototype, we use the eXtended Discrete Element Method (XDEM)[2] for handling DEM calculations and OpenFOAM for the CFD. The XDEM solver receives various CFD data fields such as fluid properties, and flow conditions exchanged through preCICE, which are used to set boundary conditions for particles. Various heat transfer and mass transfer laws have been implemented in XDEM to steer HMT source term computations. The heat and mass source terms computed by XDEM are transferred to CFD solver and added as source. These source terms represent particles in CFD. The generic coupling interface of preCICE, XDEM and its adapter allows to tackle a di- verse range of applications. We demonstrate the heat, mass & momentum coupling capa- bilities through various test cases and then compared with our legacy XDEM-OpenFOAM coupling and experimental results. [less ▲]

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See detailDevelopment of an HPC Multi-Physics Biomass Furnace Simulation and Integration in a Cloud-based Workflow
Besseron, Xavier UL; Henrik, Rusche; Peters, Bernhard UL

Scientific Conference (2022, June 09)

Biomass combustion offers a credible alternative to reduce the consumption of fossil fuels. To optimize the biomass combustion process and improve the design of biomass furnaces numerical simulation is a ... [more ▼]

Biomass combustion offers a credible alternative to reduce the consumption of fossil fuels. To optimize the biomass combustion process and improve the design of biomass furnaces numerical simulation is a less expensive and time-effective approach as opposed to the experimental method. However, the combustion in a biomass furnace involves intricate physical phenomena that must be modeled (and validated) carefully, in the fuel bed (with particle motion and shrinking, heat transfer, drying, pyrolysis, gasification) and in the surrounding gas (with turbulence, combustion, radiation). With this level of complexity, and to be conducted in a reasonable time, the simulation of industrial biomass furnaces requires the use of High-Performance Computing (HPC) platforms and expertise, which is usually not affordable for manufacturing SMEs. To address this issue, we developed a configurable digital twin of a biomass furnace running on HPC and we designed a cloudified easy-to-use end-to-end workflow. This fully automated workflow, from user input to results analysis, has been integrated into the digital marketplace of the CloudiFacturing EU project and is now directly available to SMEs via a Cloud portal. With this presentation, we want to offer a glance at the internal details and enabling technologies used in our parallel coupled application and scientific workflow. Our parallel simulation tool for biomass furnaces combines OpenFOAM (for the gas phase) parallelized with MPI and XDEM (for the solid wood particles) parallelized with OpenMP. The two libraries are coupled in parallel using an original approach based on the co-located partitioning strategy which has been tailored to minimize communications. As for the cloud workflow, it is based on an all-in-one Singularity image containing all the software, scripts, and data required to prepare the simulation input, execute the computation-intensive simulation, and analyze the results. Finally, we present the lessons learned from the development of this complex workflow and highlight the remaining challenges related to HPC multi-physics coupled simulations. [less ▲]

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See detailA CutFEM Method for a Mechanistic Modelling of Astrocytic Metabolism in 3D Physiological Morphologies
Farina, Sofia UL; Voorsluijs, Valerie UL; Claus, Susanne et al

Scientific Conference (2022, June 07)

Investigating neurodegenerative diseases can be done complementary through biological and computational experiments. A good computational approach describing a simplification of the reality and focusing ... [more ▼]

Investigating neurodegenerative diseases can be done complementary through biological and computational experiments. A good computational approach describing a simplification of the reality and focusing only on some features of the problem can help getting insights on the field. The question addressed in our work is the role of astrocytes in neurodegeneration. These cells have two interesting characteristics that we want to investigate in our model: first, their role as metabolic mediator between neurons and blood vessels and second, their peculiar morphology. In fact, metabolic dysfunctions and morphological changes have been noticed in astrocyte affected by neuropathology. Computationally the main difficulty arising from solving a metabolic model into cellular shape comes from the complexity of the domain. The shape of astrocytes are very ramified, with thin branches and sharp edges. As shown in our previous work \cite{Farina}, a \cutfem{} \cite{Burman} approach is a suitable tool to deal with this issue. In our latest work we use real human three-dimensional astrocyte morphologies obtained via microscopy \cite{Salamanca} as domain to solve our system. The performed simulations highlight the effect of morphological changes on the system output. Suggesting that our model can be crucial in understanding the morphological-dependency in neuropathologies and that the spatial component cannot be neglected. [less ▲]

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See detailData Protection and Consenting Communication Mechanisms: Current Proposals and Challenges
Human, Soheil; Degeling, Martin; Santos, Christiana et al

in IEEE eXplore (2022, June 06)

Data Protection and Consenting Communication Mechanisms (DPCCMs) have the potential of becoming one of the most fundamental means of protecting humans’ privacy and agency. However, they are yet to be ... [more ▼]

Data Protection and Consenting Communication Mechanisms (DPCCMs) have the potential of becoming one of the most fundamental means of protecting humans’ privacy and agency. However, they are yet to be improved, adopted and enforced. In this paper, based on the results of a technical document analysis and an expert study, we we identify some of the main technical factors that can be comparison factors between some of the main interdisciplinary challenges of a Human-centric, Accountable, Lawful, and Ethical practice of personal data processing on the Internet and discuss whether the current DPCCMs proposal can contribute towards their resolution. In particular, we discuss the two current open specifications, i.e. the Advanced Data Protection Control (ADPC) and the Global Privacy Control (GPC) based on the identified challenges. [less ▲]

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See detailUsing Bayes factors to compare dynamical models of hydrological systems
Mingo Ndiwago, Damian UL; Nijzink, Remko; Ley, Christophe UL et al

Scientific Conference (2022, June 05)

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See detail"Hybrid is the new normal." Einblicke in die Projekte des Luxembourg Centre for Contemporary and Digital History am Beispiel der virtuellen Ausstellungen ww1.lu, zeitschichten.be und minett-stories.lu
Brüll, Christoph UL

Scientific Conference (2022, June 03)

Seinen Forschungsschwerpunkt in der digitalen Geschichte trägt das 2017 gegründete C²DH bereits im Namen. Überlegungen zu den methodologischen Herausforderungen des Digitalen für die ... [more ▼]

Seinen Forschungsschwerpunkt in der digitalen Geschichte trägt das 2017 gegründete C²DH bereits im Namen. Überlegungen zu den methodologischen Herausforderungen des Digitalen für die Geschichtswissenschaft stehen bei seiner Arbeit genauso im Mittelpunkt wie das Nachdenken über den Einsatz digitaler Mittel bei der Vermittlung von Zeitgeschichte. Bei dieser Digital Public History spielen besonders die so genannten virtuellen Ausstellungen eine große Rolle. Der Vortrag bettet diese in einem ersten Teil in die konzeptionelle Ausrichtung des C²DH ein, bevor im zweiten Teil drei Ausstellungen vorgestellt werden: zum Ersten Weltkrieg in Luxemburg (2018), zur Geschichte Ostbelgiens seit 1920 (2020) und zur Sozial- und Industriegeschichte im luxemburgisch-französischen Grenzgebiet (2022). Besondere Aufmerksamkeit kommt der Problematisierung der Nutzung von Archivquellen in diesen Ausstellungen zu – sowohl im Zusammenspiel mit anderen (v.a. audiovisuellen) Quellen als auch aus methodischer und didaktischer Perspektive. [less ▲]

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See detailExploring the History of Digital History: Setting an Agenda
Zaagsma, Gerben UL

Scientific Conference (2022, June 02)

See attached.

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See detailUnlocking web archives through metadata, seed lists and derived data
Clavert, Frédéric UL; Schafer, Valerie UL

Scientific Conference (2022, June 01)

This presentation addresses the use, re-use, access and dissemination of data related to web archives. Web archives (Brügger, 2018) have been for several years in a hybrid position regarding access ... [more ▼]

This presentation addresses the use, re-use, access and dissemination of data related to web archives. Web archives (Brügger, 2018) have been for several years in a hybrid position regarding access, depending on the institutions that were preserving them. While Internet Archive has made its collections available online since 2001 through the Wayback Machine (but with limited features for scholars willing to conduct a distant reading based on data, WARC files, etc.), most national libraries only allowed an onsite access due to authors rights restrictions (and in some cases the frame of legal deposits), while starting to provide interesting metadata for research projects willing to explore them. However, the situation is currently evolving in the frame of several research projects that allow to access a vast amount of (international) metadata and datasets. Taking two research projects in progress as case studies, WARCnet and AWAC2, this paper aims to present the move towards the use of metadata and derived data related to huge collections of web archives of the COVID crisis. WARCnet (Web ARChive studies network researching web domains and events) is a network whose activities (funded by the Independent Research Fund Denmark | Humanities (grant no 9055-00005B)) run in 2020-2023. The networking activities are guided by overarching research questions, one of them being “How transnational events developed on the European web?” (and notably the COVID crisis which is explored in WG2 (https://cc.au.dk/en/warcnet/working-groups)). AWAC2 (Analysing Web Archives of the COVID Crisis through the IIPC Novel Coronavirus dataset) is a project part of the Archives Unleashed Cohort Program, that supports and facilitates research engagement with web archives. It aims to explore a unique collection of web material (https://archive-it.org/collections/13529) related to the pandemic, with contributions from over 30 members of IIPC (International Internet Preservation Consortium) as well as public nominations from over 100 individuals/institutions. May it be in terms of access or tools, both projects are currently exploring new methodologies based on broad datasets (i.e. 5,3 TB for the IIPC collection related to the COVID crisis; 9.4 GB and 8,738,751 lines for the CSV related to plain text webpages). Starting with the WARCnet project, the presentation will explain how its WG2 gathered and accessed several national European datasets of COVID web archives, their specificities as well as their heterogeneity, the first analysis conducted through a datathon on January- February 2021 (Aasman et al. 2021) and the limits and assets of such access. Within the AWAC2 project (2021-2022) the access to the international IIPC COVID collection, through Archive-It and through the cohort program developed by the Archives Unleashed Team (Netpreserve, 2021; Ruest et al., 2021), is then a new opportunity to access data through mediated interfaces (ARCH) and to go further into them. Here again the presentation will demonstrate new opportunities and show a few examples of the analysis conducted by the team. Both examples aim to present the way web archiving institutions, libraries and researchers are developing new ways of accessing and exploring web archives, while also increasing their value(s) (Schafer and Winters, 2021). References Aasman, S., Bingham, N., Brügger, N., de Wild, K., Gebeil S. & Schafer V. (2021). Chicken and Egg: Reporting from a Datathon Exploring Datasets of the COVID- 19 Special Collections, WARCnet paper, Aarhus, https://cc.au.dk/fileadmin/dac/Projekter/WARCnet/Aasman_et_al_Chicken_and_Egg.pdf Brügger, N. (2018). The Archived Web. Doing History in the Digital Age. Cambridge, MA: The MIT Press. IIPC (2021), A Retrospective with the Archives Unleashed Project, netpreserve blog, https://netpreserveblog.wordpress.com/2021/04/01/a-retrospective-with-the-archives-unleashed-project/ Ruest, N., Fritz, S., Deschamps, R. Lin, J. & Milligan, I. (2021) From archive to analysis: accessing web archives at scale through a cloud-based interface. International Journal of Digital Humanities, https://paperity.org/p/260049927/from-archive-to-analysis-accessing-web-archives-at-scale-through-a-cloud-based-interface Schafer V. & Winters J. (2021). The values of web archives, International Journal of Digital Humanities, 1-10, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8190571/ [less ▲]

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See detailSignal-Oriented ECUs in a Centralized Service-Oriented Architecture: Scalability of the Layered Software Architecture
Bengtsson, Hoai Hoang; Hiller, Martin; Migge, Jörn et al

Scientific Conference (2022, June 01)

The industry is quickly moving away from a function/signal-oriented architecture towards Service-Oriented Architectures (SOA). To carry-over legacy signal-oriented ECUs during the transition phase, Volvo ... [more ▼]

The industry is quickly moving away from a function/signal-oriented architecture towards Service-Oriented Architectures (SOA). To carry-over legacy signal-oriented ECUs during the transition phase, Volvo Cars has developed a layered software (SW) architecture based on the concepts of "device proxys" (i.e., one per legacy ECU), signal real-time database and service interface. This architecture, executing on the central computer on the TSN backbone, provides a clear separation of concerns between its components with a reduced additional complexity. In this presentation, we will review the main challenges faced in the integration of signal-oriented ECUs into SOA, and present the solutions explored at Volvo with a focus on layered SW architecture in the centralized E/E architecture and its 3 core components: o Device Proxies o Signal DataBase o Service Interface We then report on the performances of this architecture in terms of latencies and conclude on the maximum number of signal-oriented frames and legacy ECUs that can be handled. The performance evaluation is conducted by simulation, with sensitivity analysis to identify the performance bottlenecks. The E/E architecture under study is a prototype TSN-based central computing architecture targeted at next-generation models. The main questions that will be discussed throughout the presentation are 1) how to efficiently handle signal to service conversion? 2) The performance and the scalability of the SW architecture proposed and 3) the suitability of SOME/IP as the SOA protocol. [less ▲]

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See detailReal-Time Large Deformation Simulations Using Probabilistic Deep Learning Framework
Saurabh, Deshpande; Jakub, Lengiewicz; Stephane, Bordas

Scientific Conference (2022, June)

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See detailDie zweifache Rechtfertigung des ‚Bösewichts‘: Figurationen des Bösen bei Schiller
Kohns, Oliver UL

Scientific Conference (2022, June)

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See detailComparison of UVC and Solar-based Processes for the Simultaneous Removal of Microcontaminants and Microorganism from Urban Wastewater Effluents I.
Salmeron Garcia, Irene UL; Sánchez-Montes, Isaac; Ruiz-Delgado, Ana et al

Scientific Conference (2022, June)

Currently, the presence of microcontaminats (MCs) and pathogens in secondary municipal wastewater treatment plant effluents entails a challenge to be addressed before water discharge or reuse. In this ... [more ▼]

Currently, the presence of microcontaminats (MCs) and pathogens in secondary municipal wastewater treatment plant effluents entails a challenge to be addressed before water discharge or reuse. In this work UVC (UVC/S2O82-, UVC/H2O2) and solar-based processes (solar/S2O82- and solar/H2O2) are proposed as tertiary treatments for the simultaneous removal of both, MCs and pathogens, comparing their efficiency aiming to find the most suitable solution. The microorganisms studied were Escherichia coli, Enterococcus faecalis and Salmonella enteritidis in a concentration of 103 CFU mL-1 each and a mixture of 6 MCs (acetaminophen, caffeine, carbamazepine, trimethoprim, sulfamethoxazole and diclofenac) each at 100 μg L-1 of initial concentration, using simulated wastewater treatment plant effluent as water matrix. The concentrations of oxidants studied were 25 and 50 mg L-1 of each, respectively. Results revealed that UVC/H2O2 at 25 mg L-1 presented the most satisfactory solution considering treatment time and addition of reagents for complete inactivation of target pathogens and 80% removal of the sum of MCs. [less ▲]

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See detailFeasibility of Advanced Oxidation Processes as an upgrade for Microcontaminants removal at municipal Wastewater Treatment Plants
Salmeron Garcia, Irene UL; Nunez Tafalla, Paula UL; Venditti, Silvia UL et al

Scientific Conference (2022, June)

Benzotriazole, carbamazepine, clarithromycin and diclofenac have been identified as microcontaminants of concern in Luxembourgish wastewaters, thus the implementation of photo-Fenton processes at natural ... [more ▼]

Benzotriazole, carbamazepine, clarithromycin and diclofenac have been identified as microcontaminants of concern in Luxembourgish wastewaters, thus the implementation of photo-Fenton processes at natural pH has been proposed for their removal. In the present work, the effectiveness of a pilot scale photo-Fenton system (500W Medium Pressure) has been evaluated according to the reagent dosage and toxicity of the treated effluent. With this treatment, 80% degradation is achieved in 15 minutes even with 5 and 3 mg/L of iron (40 mg/L H2O2), but 5 mg/L can have a negative effect on the growth of Sorghum saccharatum in Phytotoxicity tests. In comparison UV-C/H2O2 (40W Low Pressure; 40 mg/L H2O2) process needs longer treatment time and generates degradation by-products causing a growth inhibition of Sorghum saccharatum. The combination of both lamps can lead to a better performance of the reagents allowing to reach the 80% target in less time and to reduce the dosage. [less ▲]

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See detailApproximating WCRT through the aggregation of short simulations with different initial conditions: application to TSN
Keller, Patrick UL; Navet, Nicolas UL

in 30th International Conference on Real-Time Networks and Systems (RTNS ’22) (2022, June)

Assessing traversal times is the main concern in the verification of embedded real-time networks. Schedulability analysis, as it provides firm guarantees, is the preferred technique for the designers of ... [more ▼]

Assessing traversal times is the main concern in the verification of embedded real-time networks. Schedulability analysis, as it provides firm guarantees, is the preferred technique for the designers of critical systems. There are however contexts where it is not economically or technically feasible to develop one, typically when the software and hardware components have not been designed with predictability in mind, e.g. as soon as TCP-based traffic is involved in network communication or when the hardware platform is too complex (e.g. heterogeneous System-on-Chips). In this paper, we study if it is possible to improve the ability of simulation to observe large traversal times, by running many short simulations with appropriately chosen simulation time and varying initial offsets of the stations on the network. The de-facto standard approach to assess maximal traversal times is to run a single long simulation with synchronized node start offsets and to use randomized node clock drifts inside an acceptable range. This approach is known to yield high traversal times but is not parallelizable. We propose an alternative approach consisting in splitting the simulation time over multiple shorter simulations with, optionally, randomized node start offsets. We evaluate the optimization potential of this simple approach on several realistic network configurations by comparing long simulations to aggregated short simulations, with and without synchronized node start offsets. We observe, considering all flows, that this allows a median improvement of up to 21.3% in terms of maximum traversal time observed, for the same simulation time budget. Additional randomization of the node start offsets showed further improvements of up to 4.8% in our experiments. Results from this line of work can be used to estimate the pessimism of schedulability analyses and verify systems for which no analysis is available. [less ▲]

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