References of "2019"
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See detailThe Zooniverse and the Historian
Tatarinov, Juliane UL

Diverse speeches and writings (2019)

https://dhh.uni.lu/2019/12/19/the-zooniverse-and-the-historian/

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See detailThe Buckling and Post-Buckling of Steel C-Columns in Elevated Temperature
Czechowski, Leszek; Kedziora, Slawomir UL; Kolakowsk, Zbigniew

in Materials (2019), 13(74), 1-12

This work deals with the investigation of a steel thin-walled C-column subjected to compression due to temperature increase. These experimental studies of the compressed columns in post-buckling state ... [more ▼]

This work deals with the investigation of a steel thin-walled C-column subjected to compression due to temperature increase. These experimental studies of the compressed columns in post-buckling state were conducted to determine their load-carrying capacity. To ensure appropriate supports and keeping of columns, plates with grooves were constructed. The tests of the columns' compression for different preloads were carried out. By comparing the experiment results, numerical calculations based on the finite element method (FEM) and the semi-analytical method (SAM) of solution were performed. The computations were executed with the use of full material characteristics with consideration of large strains and deflections. Furthermore, while observing the deformation of columns, a non-contact Digital Correlation ARAMIS\textregistered system was employed whose calculated results of deformations are very close to the results of the numerical method. The paper revealed that maximum recorded loads under temperature rise are comparable regardless of a value of initial load. A good correlation in results between used methods was achieved. The main goal of the present work was to assess of behavior of thin-walled compressed steel columns in a temperature-controlled environment till their full damage [less ▲]

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See detailInter-regional innovation cooperation and structural heterogeneity:Does being a rural, or border region, or both, make a difference?
Hjaltadottir, Rannveig Edda UL; Makkonen, Teemu; Mitze, Timo Friedel

in Journal of Rural Studies (2019)

This paper analyses the determinants of inter-regional innovation cooperation in European knowledge networks. Our main goal is to assess whether structural heterogeneity in the context of the “urban ... [more ▼]

This paper analyses the determinants of inter-regional innovation cooperation in European knowledge networks. Our main goal is to assess whether structural heterogeneity in the context of the “urban-rural dichotomy†and international borders can explain differences in the regions’ engagement in inter-regional innovation coopera-tion. We estimate a gravity equation to model innovation cooperation, proxied by inter-regional co-patent ap-plications, as a function of region-specific context conditions as well as technological and geographical distance. Our data comprise dyadic information on 203 NUTS2 regions in 15 European countries (EU-15) for the year 2010. The empirical results show that the basic gravity mechanisms drive the direction and strength of in-novation cooperation between EU regions; i.e., geographical distance acts as an impediment to inter-regional co-patent applications. Regarding the importance of structural heterogeneity, we find that pairs of rural regions have lower levels of innovation cooperation compared to urban regions. Similarly, border regions are generally disadvantaged compared to non-border regions in terms of the intensity of innovation cooperation. However, while the latter result points to a negative border effect, our gravity model estimates also show that pairs of border regions are more active in terms of close geographical innovation cooperation (e.g., through international cross-border cooperation), which partly compensates for the negative border effect. This finding not only holds for urban but also rural border regions and may reflect policy attempts to support border regions, e.g., by strengthening the level of international cross-border cooperation within the EU. [less ▲]

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See detailA Coordinated Europeanization of the Comics Industry through Distribution: The Politics of the Global Journey of Astérix and Tintin through the Strategic Distribution of their Magazines and Contents in the 1960s
Burton, Jessica UL

in On_Culture: The Open Journal for the Study of Culture (2019), 8(Winter),

Researchers have usually focused on the Tintin and Astérix series’ global book diffusion through translation. However, little has been discussed about the distribution policies of the comics magazine ... [more ▼]

Researchers have usually focused on the Tintin and Astérix series’ global book diffusion through translation. However, little has been discussed about the distribution policies of the comics magazine format, a key factor in the development of European comics. This paper will consider the continentalization of western European national comics industries via the intra-EEC networking of distribution channels during the 1960s. By facilitating the exchange of comics features in the Franco-Belgian area, publishers such as Casterman, Le Lombard, and Dargaud ensured the rise of the industry and of the products they wanted to disseminate. Contemplating the motivations of publishers this article will delve deeper into the emergence of cooperative and competitive distribution channels among national publishers and between countries. Through the archives of Casterman and primary sources this article intends to contribute to a greater understanding of how the carefully planned distribution network of comics influenced the development of the European industry as a whole. [less ▲]

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See detailL’écriture de la migration dans la Grande Région: la langue comme un élastique
Cicotti, Claudio UL

Presentation (2019, December 19)

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See detailHome literacy environment and family language policy of immigrant families in Luxembourg
Aleksic, Gabrijela UL; Bebic, Dzoen Dominique UL

Scientific Conference (2019, December 18)

Early literacy skills are critical for children’s later academic achievement. A wealth of research showed that children’s home languages should not be abandoned, as they are crucial for promoting dynamic ... [more ▼]

Early literacy skills are critical for children’s later academic achievement. A wealth of research showed that children’s home languages should not be abandoned, as they are crucial for promoting dynamic multilingualism, assuring cross-linguistic transfer and developing identities. To explore home literacy environment and family language policy of language minority preschool children in Luxembourg, we obtained 603 parent questionnaires, tested 226 children age 4 to 6 in their home languages and Luxembourgish, and interviewed 31 families. The results from the questionnaires showed that the home resources and parent involvement influenced children’s language awareness and their print knowledge irrespective of parent’s education and their wealth. Concerning children’s competences in Luxembourgish, children with positive attitudes towards their school did better than their peers in other schools. In the interviews, parents explained that maintaining home language is important for keeping connections with family, friends and their culture. This is the language parents feel emotionally connected to and the easiest to transmit to their children. Language maintenance is mostly achieved through conversations, movies, games and books in the home languages, children’s attendance of language schools on weekends, celebrations of traditions as well as holidays in the native country of the parents. The home language is, however, not something parents enforce too strictly, as they mostly correct the children’s linguistic mistakes by simple repetition. It is often with great pride that parents report their children having an excellent proficiency in their home language. Finally, through our professional development training in translanguaging we are helping teachers to integrate children’s different home languages and cultures into the classroom and strengthen the home-school collaboration in order to support children’s well-being, learning and identities. [less ▲]

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See detailDeep Pattern Mining for Program Repair
Liu, Kui UL

Doctoral thesis (2019)

Error-free software is a myth. Debugging thus accounts for a significant portion of software maintenance and absorbs a large part of software cost. In particular, the manual task of fixing bugs is tedious ... [more ▼]

Error-free software is a myth. Debugging thus accounts for a significant portion of software maintenance and absorbs a large part of software cost. In particular, the manual task of fixing bugs is tedious, error- prone and time-consuming. In the last decade, automatic bug-fixing, also referred to as automated program repair (APR) has boomed as a promising endeavor of software engineering towards alleviating developers’ burden. Several potentially promising techniques have been proposed making APR an increasingly prominent topic in both the research and practice communities. In production, APR will drastically reduce time-to-fix delays and limit downtime. In a development cycle, APR can help suggest changes to accelerate debugging. As an emergent domain, however, program repair has many open problems that the community is still exploring. Our work contributes to this momentum on two angles: the repair of programs for functionality bugs, and the repair of programs for method naming issues. The thesis starts with highlighting findings on key empirical studies that we have performed to inform future repair approaches. Then, we focus on template-based program repair scenarios and explore deep learning models for inferring accurate and relevant patterns. Finally, we integrate these patterns into APR pipelines, which yield the state of the art repair tools. The dissertation includes the following contributions: • Real-world Patch Study: Existing APR studies have shown that the state-of-the-art techniques in automated repair tend to generate patches only for a small number of bugs even with quality issues (e.g., incorrect behavior and nonsensical changes). To improve APR techniques, the community should deepen its knowledge on repair actions from real-world patches since most of the techniques rely on patches written by human developers. However, previous investigations on real-world patches are limited to statement level that is not sufficiently fine-grained to build this knowledge. This dissertation starts with deepening this knowledge via a systematic and fine-grained study of real-world Java program bug fixes. • Fault Localization Impact: Existing test-suite-based APR systems are highly dependent on the performance of the fault localization (FL) technique that is the process of the widely studied APR pipeline. However, APR systems generally focus on the patch generation, but tend to use similar but different strategies for fault localization. To assess the impact of FL on APR, we identify and investigate a practical bias caused by the FL step in a repair pipeline. We propose to highlight the different FL configurations used in the literature, and their impact on APR systems when applied to the real bugs. Then, we explore the performance variations that can be achieved by “tweaking” the FL step. • Fix Pattern Mining: Fix patterns (a.k.a. fix templates) have been studied in various APR scenarios. Particularly, fix patterns have been widely used in different APR systems. To date, fix pattern mining is mainly studied in three ways: manually summarization, transformation inferring and code change action statistics. In this dissertation, we explore mining fix patterns for static bugs leveraging deep learning and clustering algorithms. • Avatar: Fix pattern based patch generation is a promising direction in the APR community. Notably, it has been demonstrated to produce more acceptable and correct patches than the patches obtained with mutation operators through genetic programming. The performance of fix pattern based APR systems, however, depends on the fix ingredients mined from commit changes in development histories. Unfortunately, collecting a reliable set of bug fixes in repositories can be challenging. We propose to investigate the possibility in an APR scenario of leveraging code changes that address violations by static bug detection tools. To that end, we build the Avatar APR system, which exploits fix patterns of static analysis violations as ingredients for patch generation. • TBar: Fix patterns are widely used in patch generation of APR, however, the repair performance of a single fix pattern is not studied. We revisit the performance of template-based APR to build comprehensive knowledge about the effectiveness of fix patterns, and to highlight the importance of complementary steps such as fault localization or donor code retrieval. To that end, we first investigate the literature to collect, summarize and label recurrently-used fix patterns. Based on the investigation, we build TBar, a straightforward APR tool that systematically attempts to apply these fix patterns to program bugs. We thoroughly evaluate TBar on the Defects4J benchmark. In particular, we assess the actual qualitative and quantitative diversity of fix patterns, as well as their effectiveness in yielding plausible or correct patches. • Debugging Method Names: Except the issues about semantic/static bugs in programs, we note that how to debug inconsistent method names automatically is important to improve program quality. In this dissertation, we propose a deep learning based approach to spotting and refactoring inconsistent method names in programs. [less ▲]

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See detailFrom home to early childhood education: beliefs, language ideologies and OPOL
Kirsch, Claudine UL

Scientific Conference (2019, December 18)

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See detailMigration: A theoretical comparison on countries’ welfare
Zanaj, Skerdilajda UL

in International Journal of Economic Theory (2019)

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See detailSelecting fault revealing mutants
Titcheu Chekam, Thierry UL; Papadakis, Mike UL; Bissyande, Tegawendé François D Assise UL et al

in Empirical Software Engineering (2019)

Mutant selection refers to the problem of choosing, among a large number of mutants, the (few) ones that should be used by the testers. In view of this, we investigate the problem of selecting the fault ... [more ▼]

Mutant selection refers to the problem of choosing, among a large number of mutants, the (few) ones that should be used by the testers. In view of this, we investigate the problem of selecting the fault revealing mutants, i.e., the mutants that are killable and lead to test cases that uncover unknown program faults. We formulate two variants of this problem: the fault revealing mutant selection and the fault revealing mutant prioritization. We argue and show that these problems can be tackled through a set of ‘static’ program features and propose a machine learning approach, named FaRM, that learns to select and rank killable and fault revealing mutants. Experimental results involving 1,692 real faults show the practical benefits of our approach in both examined problems. Our results show that FaRM achieves a good trade-off between application cost and effectiveness (measured in terms of faults revealed). We also show that FaRM outperforms all the existing mutant selection methods, i.e., the random mutant sampling, the selective mutation and defect prediction (mutating the code areas pointed by defect prediction). In particular, our results show that with respect to mutant selection, our approach reveals 23% to 34% more faults than any of the baseline methods, while, with respect to mutant prioritization, it achieves higher average percentage of revealed faults with a median difference between 4% and 9% (from the random mutant orderings). [less ▲]

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See detailLanguage Learning in the Polish–German and Belgian–German Periphery (1919–1940)
Venken, Machteld UL

Presentation (2019, December 17)

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See detailFrom Kinora to Small-Gauge: An Experimental Media Archaeological Approach to Early-Twentieth Century Home Cinema
van der Heijden, Tim UL

Presentation (2019, December 17)

In this workshop contribution, I present my post-doctoral study within the "Doing Experimental Media Archaeology" (DEMA) research project in which I examine the genealogy of home cinema and amateur ... [more ▼]

In this workshop contribution, I present my post-doctoral study within the "Doing Experimental Media Archaeology" (DEMA) research project in which I examine the genealogy of home cinema and amateur moviemaking as early-twentieth century practices by means of a comparative, intermedial and experimental media archaeological approach. Through hands-on media archaeological experiments with the Kinora, one of the first motion picture viewing and recording technologies designed for home use from the 1900s, and various “small-gauge” film technologies from the 1920s and early 1930s, including Pathé-Baby 9.5mm and Kodak 16mm film cameras and projectors, two different “dispositifs” of home cinema and amateur moviemaking will be explored and compared. Various hands-on experiments will be conducted to provide a better understanding of the materiality and functionality of the Kinora and small-gauge film technologies as historical media objects as well as their technological affordances and performative qualities. The study aims to contribute to the development of experimental media archaeology as an alternative, experimental and sensorial approach to media historiography. [less ▲]

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See detailA Review of RFI Mitigation Techniques in Microwave Radiometry
Querol Borras, Jorge UL; Perez, Adrian; Camps, Adriano

in Remote Sensing (2019), 11(24), 3042

Radio frequency interference (RFI) is a well-known problem in microwave radiometry (MWR). Any undesired signal overlapping the MWR protected frequency bands introduces a bias in the measurements, which ... [more ▼]

Radio frequency interference (RFI) is a well-known problem in microwave radiometry (MWR). Any undesired signal overlapping the MWR protected frequency bands introduces a bias in the measurements, which can corrupt the retrieved geophysical parameters. This paper presents a literature review of RFI detection and mitigation techniques for microwave radiometry from space. The reviewed techniques are divided between real aperture and aperture synthesis. A discussion and assessment of the application of RFI mitigation techniques is presented for each type of radiometer. [less ▲]

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See detailLëtzebuerg op d’Weltkaart setzen – Kulturpolitik vum nation building zum Nation Branding
Spirinelli, Fabio UL

Conference given outside the academic context (2019)

Detailed reference viewed: 85 (7 UL)