Results 3021-3040 of 5929.
Bookmark and Share    
See detailMerging DEMs from VHR Optical Imagery with Drone Data - A High-resolution DEM for Tristan da Cunha
Backes, Dietmar UL; Teferle, Felix Norman UL

Scientific Conference (2018, December 12)

The extraction of high-resolution, Digital Elevation Models (DEM) from very high-resolution (VHR) optical satellite imagery, as well as low altitude drone images by Photogrammetric methods or modern ... [more ▼]

The extraction of high-resolution, Digital Elevation Models (DEM) from very high-resolution (VHR) optical satellite imagery, as well as low altitude drone images by Photogrammetric methods or modern Structure from Motion (SFM) engines, has rapidly matured. Today both data sources are representing cost-effective alternatives to dedicated airborne sensors, especially for remote and difficult to access regions. Ever-growing archives of high-resolution Satellite imagery, are providing a rich data source which covers even the most remote locations with high-resolution imagery up to 0.30m ground sample distance multiple times enabling the generation of high-resolution DEMS. Furthermore, low-cost, low weight and easy to use drones can easily be deployed in remote regions and capture limited areas with very high resolution. Dense point clouds derived from this method provide an invaluable data source to fill the gap between globally available low-resolution DEMs and highly accurate terrestrial surveys. The presented case study investigates the use of VHR archive imagery as well as low-cost drone imagery to generate high-quality DEMs using photogrammetric tools over a remote region which is difficult to access by manned airborne platforms. We highlight the potential and limitations of both data sources to provide high resolution, accurate elevation data. [less ▲]

Detailed reference viewed: 58 (2 UL)
Full Text
See detailWorin liegen die Chancen und Risiken der verstärkten Nutzung von Informations- und Kommunikationstechnologien außerhalb des Arbeitsplatzes?
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2018)

Rund 11% der Arbeitnehmer in Luxemburg können der Gruppe zugeordnet werden, die häufig Informations- und Kommunikationstechnologien nutzt, um fern von ihrer organisationalen Arbeitsstelle zu arbeiten ... [more ▼]

Rund 11% der Arbeitnehmer in Luxemburg können der Gruppe zugeordnet werden, die häufig Informations- und Kommunikationstechnologien nutzt, um fern von ihrer organisationalen Arbeitsstelle zu arbeiten. Insbesondere bei männlichen und höher gebildeten Arbeitnehmern sowie bei Managern und Arbeitnehmern in akademischen Berufen ist dieser Anteil an Nutzern stärker ausgeprägt. Diese Arbeitsplatz fernen Nutzer von Informationstechnologien geben im Durchschnitt ein höheres Maß an Autonomie und Partizipation bei der Arbeit an, sind jedoch verstärkt von problematischen psychosozialen Arbeitsbedingungen (z.B. Mobbing, Work-Life-Konflikte) sowie Burnout betroffen. [less ▲]

Detailed reference viewed: 49 (2 UL)
See detailGeschlechter(re)konstruktionen in Autobiographien transgeschlechtlicher Menschen - Namenskunde
Artuso, Sandy Kathy UL

Scientific Conference (2018, December 12)

Detailed reference viewed: 64 (2 UL)
Full Text
Peer Reviewed
See detailPlasmonic mid-infrared third harmonic generation in germanium nanoantennas
Fischer, Marco P.; Riede, Aaron; Gallacher, Kevin et al

in Light: Science and Applications (2018)

Detailed reference viewed: 104 (5 UL)
Full Text
See detailBowditch's Q-conditions and Minsky's primitive stability
Lee, Jaejeong; Xu, Binbin UL

E-print/Working paper (2018)

For the action of the outer automorphism group of the rank two free group on the corresponding variety of PSL(2,C) characters, two domains of discontinuity have been known to exist that are strictly ... [more ▼]

For the action of the outer automorphism group of the rank two free group on the corresponding variety of PSL(2,C) characters, two domains of discontinuity have been known to exist that are strictly larger than the set of Schottky characters. One is introduced by Bowditch in 1998 (followed by Tan, Wong and Zhang in 2008) and the other by Minsky in 2013. We prove that these two domains are equal. We then show that they are contained in the set of characters having what we call the bounded intersection property. [less ▲]

Detailed reference viewed: 69 (6 UL)
Full Text
Peer Reviewed
See detailCan we automate away the main challenges of end-to-end testing?
Rwemalika, Renaud UL; Kintis, Marinos UL; Papadakis, Mike UL et al

Scientific Conference (2018, December 11)

Agile methodologies enable companies to drastically increase software release pace and reduce time-to-market. In a rapidly changing environment, testing becomes a cornerstone of the software development ... [more ▼]

Agile methodologies enable companies to drastically increase software release pace and reduce time-to-market. In a rapidly changing environment, testing becomes a cornerstone of the software development process, guarding the system code base from the insertion of faults. To cater for this, many companies are migrating manual end-to-end tests to automated ones. This migration introduces several challenges to the practitioners. These challenges relate to difficulties in the creation of the automated tests, their maintenance and the evolution of the test code base. In this position paper, we discuss our preliminary results on such challenges and present two potential solutions to these problems, focusing on keyword-driven end-to-end tests. Our solutions leverage existing software artifacts, namely the test suite and an automatically-created model of the system under test, to support the evolution of keyword-driven test suites. [less ▲]

Detailed reference viewed: 161 (23 UL)
Full Text
Peer Reviewed
See detailTREM2 triggers microglial density and age‐related neuronal loss
Linnartz-Gerlach, Bettina; Bodea, Liviu-Gabriel; Klaus, Christine et al

in Glia (2018)

The microglial triggering receptor expressed on myeloid cells 2 (TREM2) signals via the activatory membrane adaptor molecule TYROBP. Genetic variants or mutations of TREM2 or TYROBP have been linked to ... [more ▼]

The microglial triggering receptor expressed on myeloid cells 2 (TREM2) signals via the activatory membrane adaptor molecule TYROBP. Genetic variants or mutations of TREM2 or TYROBP have been linked to inflammatory neurodegenerative diseases associated with aging. The typical aging process goes along with microglial changes and mild neuronal loss, but the exact contribution of TREM2 is still unclear. Aged TREM2 knock‐out mice showed decreased age‐related neuronal loss in the substantia nigra and the hippocampus. Transcriptomic analysis of the brains of 24 months old TREM2 knock‐out mice revealed 211 differentially expressed genes mostly downregulated and associated with complement activation and oxidative stress response pathways. Consistently, 24 months old TREM2 knock‐out mice showed lower transcription of microglial (Aif1 and Tmem119), oxidative stress markers (Inos, Cyba, and Cybb) and complement components (C1qa, C1qb, C1qc, C3, C4b, Itgam, and Itgb2), decreased microglial numbers and expression of the microglial activation marker Cd68, as well as accumulation of oxidized lipids. Cultured microglia of TREM2 knock‐out mice showed reduced phagocytosis and oxidative burst. Thus, microglial TREM2 contributes to age‐related microglial changes, phagocytic oxidative burst, and loss of neurons with possible detrimental effects during physiological aging. [less ▲]

Detailed reference viewed: 138 (15 UL)
Full Text
See detailOn Degree-d Zero-Sum Sets of Full Rank
Beierle, Christof UL; Biryukov, Alex UL; Udovenko, Aleksei UL

E-print/Working paper (2018)

A set S⊆Fn2 is called degree-d zero-sum if the sum ∑s∈Sf(s) vanishes for all n-bit Boolean functions of algebraic degree at most d. Those sets correspond to the supports of the n-bit Boolean functions of ... [more ▼]

A set S⊆Fn2 is called degree-d zero-sum if the sum ∑s∈Sf(s) vanishes for all n-bit Boolean functions of algebraic degree at most d. Those sets correspond to the supports of the n-bit Boolean functions of degree at most n−d−1. We prove some results on the existence of degree-d zero-sum sets of full rank, i.e., those that contain n linearly independent elements, and show relations to degree-1 annihilator spaces of Boolean functions and semi-orthogonal matrices. We are particularly interested in the smallest of such sets and prove bounds on the minimum number of elements in a degree-d zero-sum set of rank n. The motivation for studying those objects comes from the fact that degree-d zero-sum sets of full rank can be used to build linear mappings that preserve special kinds of nonlinear invariants, similar to those obtained from orthogonal matrices and exploited by Todo, Leander and Sasaki for breaking the block ciphers Midori, Scream and iScream. [less ▲]

Detailed reference viewed: 44 (1 UL)
See detailIntroduction to Deontic Logic and Normative Systems
Parent, Xavier UL; van der Torre, Leon UL

Book published by College Publications (2018)

Deontic logic deals with obligation, permission and related normative concepts. This textbook introduces three frameworks that have dominated the landscape of deontic logic: monadic deontic logic, dyadic ... [more ▼]

Deontic logic deals with obligation, permission and related normative concepts. This textbook introduces three frameworks that have dominated the landscape of deontic logic: monadic deontic logic, dyadic deontic logic, and input/output logic. It describes their language, semantics, proof theory, and gives soundness and completeness theorems. The addition of exercises makes the book ideal for self-study or as a textbook in class. Deontic logic remains neutral on application issues. Over the years, it has been applied in a variety of fields, including philosophy, ethics, linguistics, computer science, and the law. This textbook will serve as a valuable resource for students and researchers wishing to gain a practical understanding of deontic logic for use in their work. [less ▲]

Detailed reference viewed: 84 (21 UL)
Full Text
Peer Reviewed
See detailGenome-wide mega-analysis identifies 16 loci and highlights diverse biological mechanisms in the common epilepsies
The International League Against Epilepsy Consortium on Complex Epilepsies; Krause, Roland UL

in Nature Communications (2018)

Detailed reference viewed: 125 (2 UL)
See detail‘Curriculizing’ Multilingualism? Language Curricula and the Construction of Identity in Multilingual Societies: the example of Luxembourg
Sattler, Sabrina UL

Presentation (2018, December 10)

In addition to its historically and contextually determined multilingualism, the Grand Duchy of Luxembourg is home to numerous immigrant languages, and today almost 48% of the population are foreigners ... [more ▼]

In addition to its historically and contextually determined multilingualism, the Grand Duchy of Luxembourg is home to numerous immigrant languages, and today almost 48% of the population are foreigners (STATEC, 2018). Beside the three official languages, French, German and Luxembourgish, other languages are used in everyday contexts. Educational policy thus has to integrate pupils of non-Luxembourg origin into the inherently trilingual school system. The 2009 reform of primary education is accordingly to be understood, among other things, as an educational policy response to the linguistic diversification of society. One of its goals was to respond more forcefully to the didactic and pedagogic challenges of this extremely heterogeneous and multilingual social composition. The existing 1912 law governing primary education was replaced, and the organisation of teaching and the curriculum were adapted. In terms of cultural history, this goes hand in hand with an educationalization of social problems (Smeyers & Depaepe, 2008), that is to say, the idea, paradigmatic for the modern age, that concrete social challenges are delegated so that they fall within the remit of education (see ibid., 2). In this process it is the curriculum that serves as the core of ideas of intervention. The curriculum, as a road map for a strategy of national and supranational education policy and as a pedagogic reaction to, or intervention in, social and historical change, is thus ascribed a role in constructing identity. In this connection the curriculum, as an instrument of socialisation, cannot be limited merely to directives for teaching. By definition, the curriculum has a hidden agenda, since it meshes with specific, usually also provisional, conceptions of a society. Taking this definition as its starting-point, the paper works with a broad concept of curriculum, on the basis of which school programmes represent the universal attempt at social engineering. Following from this idea, the curriculum becomes a ‘cultural construction of the child and the future citizen’ (Tröhler, 2014, p. 60). This cultural construction becomes evident when one realizes that meaning is produced through historical processes that create common sense and which are stabilized through certain social or cultural practices (see Popkewitz, 2011, p. 164; see also Popkewitz, 2008). Such distinct practices and cultural connotations are in Luxembourg specifically linked to the use of language. In the light of these reflections, the paper tackles the central question, to what extent multilingualism and, with it, distinct conceptions of identity in Luxembourg are ‘curriculized’. Of interest here is the historical question, which ideas about a constructed linguistic identity were dominant before and after the primary education reform of 2009 and what the direction of travel is. Here I introduce the concept, first formulated at the beginning of the 20th century, of a Luxembourgian Mischkultur (mixed culture: Weber, 1909) and discuss the extent to which this idea conflicts with contemporary tendencies in educational planning. The paper will show that Luxembourg, as a kind of laboratory because of developing processes of globalisation and migration, is relevant to other multilingual contexts in general and curricular development in particular. [less ▲]

Detailed reference viewed: 96 (17 UL)
Full Text
Peer Reviewed
See detailModelling Scale in Historiographical Data
Armaselu, Florentina UL

Scientific Conference (2018, December 09)

The project will investigate the meaning of scale in historical writings, and more precisely how scale is expressed through language in historical discourse. This question draws attention to the ... [more ▼]

The project will investigate the meaning of scale in historical writings, and more precisely how scale is expressed through language in historical discourse. This question draws attention to the conceptual and linguistic mechanisms at play in building historical knowledge, when the historian moves between different layers of analysis, narration or consulted sources, involving different degrees of generality. A small historiographical corpus, in which variations of scale are clearly present, will serve to develop the digital approach/tools/methodology. Depending on the findings of the project, an extension of the research to other types of corpora is envisaged. The paper presents a workflow and first experiments using topic modelling to analyse scale representation in historiographical data. Further experiments with more documents, other models and visualisation tools, as well as eventually creating a pipeline for semi-automatic restructuration of data as zoomable texts are also envisaged. [less ▲]

Detailed reference viewed: 91 (33 UL)
Full Text
Peer Reviewed
See detailImproving Predictions of Upward Cost Adjustment and Cost Asymmetry at the Firm-Year Level
Kaspereit, Thomas UL; Lopatta, Kerstin

in Journal of Management Accounting Research (2018)

This study introduces a new method for predicting cost elasticity with respect to changes in sales that incorporates cost asymmetry at the firm-year level. The new method is based on widely available ... [more ▼]

This study introduces a new method for predicting cost elasticity with respect to changes in sales that incorporates cost asymmetry at the firm-year level. The new method is based on widely available factors that, according to the “economic theory of sticky costs” (Banker et al., 2013) and the “integrated theory of cost behavior” (Banker and Byzalov, 2014), are expected to influence cost behavior. The new method is subject to fewer data restrictions than the method proposed by Weiss (2010). By extending the cost variability and cost stickiness (CVCS) model of Banker and Chen (2006), we find that incorporating firm-year specific proxy measures for upward cost adjustment and cost asymmetry significantly enhances earnings forecasts. However, this improvement in forecast accuracy is not reflected in contemporaneous stock returns, pointing towards a partial understanding of cost behavior by capital markets. We further find that predicted cost stickiness is associated with lower analysts’ forecast accuracy and a weaker effect of earnings surprises on market reactions, confirming the results reported in Weiss(2010) for his measure of cost asymmetry. [less ▲]

Detailed reference viewed: 85 (3 UL)
Full Text
See detailLe Mouvement écologique dans les longues années 1960
Scuto, Denis UL

Article for general public (2018)

Detailed reference viewed: 49 (5 UL)
Full Text
See detailLes “petites classes moyennes” se vivent comme les suivants sur la liste des victimes
Chauvel, Louis UL

Article for general public (2018)

Detailed reference viewed: 113 (8 UL)
Full Text
See detailBioactive nanotopographies for the control of mesenchymal stem cell differentiation for applications in bone tissue engineering
Realista Coelho Dos Santos Pedrosa, Catarina UL

Doctoral thesis (2018)

Nanotopography with length scales of the order of extracellular matrix elements offers the possibility of regulating cell behavior. Investigation of the impact of nanotopography on cell response has been ... [more ▼]

Nanotopography with length scales of the order of extracellular matrix elements offers the possibility of regulating cell behavior. Investigation of the impact of nanotopography on cell response has been limited by inability to precisely control geometries, especially at high spatial resolutions, and across practically large areas. This work allowed the fabrication of well-controlled and periodic nanopillar arrays of silicon to investigate their impact on osteogenic differentiation of human mesenchymal stem cells (hMSCs). Silicon nanopillar arrays with critical dimensions in the range of 40-200 nm, exhibiting standard deviations below 15% across full wafers were realized using self-assembly of block copolymer colloids. To investigate if modifications of surface chemistry could further improve the modulation of hMSC differentiation, mimetic peptides were grafted on the fabricated nanoarrays. A peptide known for its ability to ameliorate cell adhesion (RGD peptide), a synthetic peptide able to enhance osteogenesis (BMP-2 mimetic peptide), and a combination or both molecules were covalently grafted on the nanostructures. Immunofluorescence and quantitative polymerase chain reaction (RT-qPCR) measurements reveal clear dependence of osteogenic differentiation of hMSCs on the diameter and periodicity of the arrays. Moreover, the differentiation of hMSCs was found to be dependent on the age of the donor. Surface functionalization allowed additional enhancement of the expression of osteogenic markers, in particular when RGD peptide and BMP-2 mimetic peptide were co-immobilized. These findings can contribute for the development of personalized treatments of bone diseases, namely novel implant nanostructuring depending on patient age. [less ▲]

Detailed reference viewed: 42 (5 UL)
Full Text
Peer Reviewed
See detailLSRepair: Live Search of Fix Ingredients for Automated Program Repair
Liu, Kui UL; Koyuncu, Anil UL; Kim, Kisub UL et al

in 25th Asia-Pacific Software Engineering Conference (APSEC) (2018, December 07)

Automated program repair (APR) has extensively been developed by leveraging search-based techniques, in which fix ingredients are explored and identified in different granularities from a specific search ... [more ▼]

Automated program repair (APR) has extensively been developed by leveraging search-based techniques, in which fix ingredients are explored and identified in different granularities from a specific search space. State-of-the approaches often find fix ingredients by using mutation operators or leveraging manually-crafted templates. We argue that the fix ingredients can be searched in an online mode, leveraging code search techniques to find potentially-fixed versions of buggy code fragments from which repair actions can be extracted. In this study, we present an APR tool, LSRepair, that automatically explores code repositories to search for fix ingredients at the method-level granularity with three strategies of similar code search. Our preliminary evaluation shows that code search can drive a faster fix process (some bugs are fixed in a few seconds). LSRepair helps repair 19 bugs from the Defects4J benchmark successfully. We expect our approach to open new directions for fixing multiple-lines bugs. [less ▲]

Detailed reference viewed: 233 (25 UL)