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See detailVisualizing the Learning Progress of Self-Driving Cars
Mund, Sandro; Frank, Raphaël UL; Varisteas, Georgios UL et al

in 21st International Conference on Intelligent Transportation Systems (2018, November 02)

Using Deep Learning to predict lateral and longitudinal vehicle control, i.e. steering, acceleration and braking, is becoming increasingly popular. However, it remains widely unknown why those models ... [more ▼]

Using Deep Learning to predict lateral and longitudinal vehicle control, i.e. steering, acceleration and braking, is becoming increasingly popular. However, it remains widely unknown why those models perform so well. In order for them to become a commercially viable solution, it first needs to be understood why a certain behavior is triggered and how and what those networks learn from human-generated driving data to ensure safety. One research direction is to visualize what the network sees by highlighting regions of an image that influence the outcome of the model. In this vein, we propose a generic visualization method using Attention Heatmaps (AHs) to highlight what a given Convolutional Neural Network (CNN) learns over time. To do so, we rely on a novel occlusion technique to mask different regions of an input image to observe the effect on a predicted steering signal. We then gradually increase the amount of training data and study the effect on the resulting Attention Heatmaps, both in terms of visual focus and temporal behavior. [less ▲]

Detailed reference viewed: 191 (16 UL)
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See detailVisualizing the performance loss of solar cells by IR thermography — an evaluation study on CIGS with artificially induced defects
Vetter, Andreas; Babbe, Finn UL; Hofbeck, Bernhard et al

in Progress in Photovoltaics (2016), 24(7), 1001-1008

Local electric defects may result in considerable performance losses in solar cells. Infrared (IR) thermography is one im- portant tool to detect these defects on photovoltaic modules. Qualitative ... [more ▼]

Local electric defects may result in considerable performance losses in solar cells. Infrared (IR) thermography is one im- portant tool to detect these defects on photovoltaic modules. Qualitative interpretation of IR images has been carried out successfully, but quantitative interpretation has been hampered by the lack of “calibration” defects. The aims of this study are to (i) establish methods to induce well-defined electric defects in thin-film solar cells serving as “calibration” defects and to (ii) assess the accuracy of IR imaging methods by using these artificially induced defects. This approach paves the way for improving quality control methods based on imaging in photovoltaic. We created ohmic defects (“shunts”) by using a focused ion beam and weak diodes (“interface shunts”) by applying a femto-second laser at rather low power on copper indium gallium selenide cells. The defects can be induced precisely and reproducibly, and the severity of the defects on the electrical performance can be well adjusted by focused ion beam/laser parameters. The successive assess- ment of the IR measurement (ILIT-Voc) revealed that this method can predict the losses in Pmpp (maximal power extract- able) with a mean error of below 10%. [less ▲]

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See detailVisualizing the Template of a Chaotic Attractor
Olszewski, Maya Alexandra UL; Meder, Jeff Alphonse Antoine UL; Kieffer, Emmanuel UL et al

in 26th International Symposium on Graph Drawing and Network Visualization (GD 2018) (2018)

Detailed reference viewed: 155 (25 UL)
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See detailVisualizing time-related data in biology, a review
Secrier, Maria; Schneider, Reinhard UL

in Briefings in Bioinformatics (2013)

Time is of the essence, also in biology. Monitoring disease progression or timing developmental defects are key aspects in the process of drug discovery and therapy trial. Furthermore, before deciphering ... [more ▼]

Time is of the essence, also in biology. Monitoring disease progression or timing developmental defects are key aspects in the process of drug discovery and therapy trial. Furthermore, before deciphering the course of evolution of these complex processes, we need an understanding of the basic dynamics of biological phenomena that are often strictly time-regulated (e.g. circadian rhythms). With the advances in technologies able to measure timing effects and dynamics of regulatory aspects, visualization and analysis tools try to keep up the pace with the new challenge. Beyond the classical timeline plots, notable attempts at more involved temporal interpretation have been made in the recent years, but awareness of the available resources is still limited within the scientific community. Here we review some of the advances in biological visualization of time-driven processes and look at how they allow analyzing data now and in the future. [less ▲]

Detailed reference viewed: 175 (4 UL)
See detailVisualizing Visions: Explorative Methods and Discovering the Rijksmuseum Digital Collection
Koeleman, Floor UL

Scientific Conference (2017, November 28)

There is an ongoing trend to digitize museum collections. This ambitious task requires large amounts of time, money and other resources. Nevertheless, these institutions think it is a worthy investment ... [more ▼]

There is an ongoing trend to digitize museum collections. This ambitious task requires large amounts of time, money and other resources. Nevertheless, these institutions think it is a worthy investment. But why? The consensus is that it will revolutionize art historical research. We look for opportunities using different tools and datasets and how useful they actually are for researchers. The dataset is usually a big hurdle when we want to get started with ‘digital art history’. This term refers to the transformative effect digital methods may have on the discipline of art history. We can easily overcome this hurdle by making use of already existing datasets. Especially since collecting data in itself is not a scholarly activity. For instance, the collection of the Rijksmuseum Amsterdam consists of about a million items, of which many are annotated and made available online. For this presentation we used the Rijksmuseum API and developed our own tools to search the digital paintings collection. A first experimental interface is shown in the screenshot above, allowing a simple comparison of artists and certain predefined themes. Using a number of basic elements we can quickly get an idea of the composition of the dataset. We can use a scatter plot to visualize dimensions and bring them into proportion to the largest artwork, ​The Night Watch​. Or use a timeline that reveals at a glance that the vast majority of the paintings collection dates back to the Dutch Golden Age. We are now taking this first experiment to the next level. And over the course of this project we do not only want to study datasets of visual culture. We also want to (learn how to) show our findings visually. To this end we follow the ‘Seven Stages of Visualizing Data’ by Ben Fry. Of great importance to us is step 7, interact, to achieve interactive information visualizations. As a result we are delighted to present to you our story of the Rijksmuseum digital collection. We have chosen storytelling to communicate our data insights. But how do such methods contribute to the history of art? And how useful are existing datasets for answering academic research questions? Lastly we will reflect on our experiences with the Rijksmuseum dataset. [less ▲]

Detailed reference viewed: 29 (4 UL)
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See detail«Le visuel au risque du médiatique dans les Bijoux de la Castafiore»
Roelens, Nathalie UL

in Contemporary French Civilization (2004)

Detailed reference viewed: 47 (1 UL)
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See detailVisuelle Politik der Schule
Priem, Karin UL

in IJHE Bildungsgeschichte (2014), 2

Detailed reference viewed: 57 (5 UL)
See detailVisuelle Vakanz. Elterliche Leerstellen in Familienportraits des 19. Jahrhunderts.
te Heesen, Kerstin UL

in te Heesen, Kerstin (Ed.) Pädagogische Reflexionen des Visuellen (2014)

Detailed reference viewed: 38 (0 UL)
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See detailVisuelle Wahrnehmung und arithmetische Kompetenzen
Wantz, Marc UL; Martin, Romain UL; Schiltz, Christine UL

in Motorik (2007), 4

Detailed reference viewed: 65 (0 UL)
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See detailVisuo-auditory sensory substitution for mobility assistance: testing TheVIBE
Durette, Barthélémy; Louveton, Nicolas UL; Alleysson, David et al

in Workshop on Computer Vision Applications for the Visually Impaired (2008) (2008)

Detailed reference viewed: 85 (5 UL)
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See detailVisuo-spatial abilities are key for children’s verbal number skills
Cornu, Véronique UL; Martin, Romain UL; Hornung, Caroline UL

Poster (2017, February 22)

Verbal number skills (i.e. counting and number naming) are milestones in numerical development. The aim of the present study was to clarify the role of different verbal abilities (VA) and visuo-spatial ... [more ▼]

Verbal number skills (i.e. counting and number naming) are milestones in numerical development. The aim of the present study was to clarify the role of different verbal abilities (VA) and visuo-spatial abilities (VSA) in the development of these verbal number skills in kindergarten. We recruited 152 children (mean age: 5.8 years) and administered different measures of VA (e.g. phonological awareness, pseudoword recall) and of VSA (e.g. spatial perception, copying) to assess their contribution to verbal number skills. Firstly, we computed two independent regression models, a “VA only” model explaining 23% of variance, and a “VSA only” model explaining 38% of variance. Adding verbal measures to the “VSA only” model does not lead to a significant increase in R2. Our results show that VSA, rather than VA, contribute to a larger extent to children’s verbal number skills. Intriguingly, the development of verbal number skills builds on VA, but more importantly on VSA. These results are potentially informative for the conception early mathematics interventions. [less ▲]

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See detailVisuo-spatial abilities are key for young children’s verbal number skills
Cornu, Véronique UL; Schiltz, Christine UL; Martin, Romain UL et al

in Journal of Experimental Child Psychology (2018), 166C

Children’s development of verbal number skills (i.e, counting abilities and knowledge of the number names) presents a milestone in mathematical development. Different factors such as visuo-spatial and ... [more ▼]

Children’s development of verbal number skills (i.e, counting abilities and knowledge of the number names) presents a milestone in mathematical development. Different factors such as visuo-spatial and verbal abilities have been discussed to contribute to the development of these foundational skills. To understand the cognitive nature of verbal number skills in young children, the present study assessed the relation of preschoolers’ verbal and visuo-spatial abilities to their verbal number skills. In total, 141 children aged between five and six years participated in the present study. Verbal number skills were regressed on vocabulary, phonological awareness and visuo-spatial abilities, as well as verbal and visuo-spatial working memory in a structural equation model. Only visuo-spatial abilities emerged as a significant predictor of verbal number skills in the estimated model. Our results suggest that visuo-spatial abilities contribute to a larger extent to children’s verbal number skills than verbal abilities. From a theoretical point of view, these results suggest a visuo-spatial, rather than a verbal, grounding of verbal number skills. These results are potentially informative for the conception of early mathematics assessments and interventions. [less ▲]

Detailed reference viewed: 319 (41 UL)
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See detailVisuo-spatial working memory (VSWM) capacity in mental strategies used with Kohs Block Design Test
Houssemand, Claude UL; Martin, Romain UL; Baldassi, M

Scientific Conference (2007, July)

Detailed reference viewed: 63 (0 UL)
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See detailVitamin C. Biosynthesis, recycling and degradation in mammals.
Linster, Carole UL; Van Schaftingen, Emile

in FEBS Journal (2007), 274(1), 1-22

Vitamin C, a reducing agent and antioxidant, is a cofactor in reactions catalyzed by Cu(+)-dependent monooxygenases and Fe(2+)-dependent dioxygenases. It is synthesized, in vertebrates having this ... [more ▼]

Vitamin C, a reducing agent and antioxidant, is a cofactor in reactions catalyzed by Cu(+)-dependent monooxygenases and Fe(2+)-dependent dioxygenases. It is synthesized, in vertebrates having this capacity, from d-glucuronate. The latter is formed through direct hydrolysis of uridine diphosphate (UDP)-glucuronate by enzyme(s) bound to the endoplasmic reticulum membrane, sharing many properties with, and most likely identical to, UDP-glucuronosyltransferases. Non-glucuronidable xenobiotics (aminopyrine, metyrapone, chloretone and others) stimulate the enzymatic hydrolysis of UDP-glucuronate, accounting for their effect to increase vitamin C formation in vivo. Glucuronate is converted to l-gulonate by aldehyde reductase, an enzyme of the aldo-keto reductase superfamily. l-Gulonate is converted to l-gulonolactone by a lactonase identified as SMP30 or regucalcin, whose absence in mice leads to vitamin C deficiency. The last step in the pathway of vitamin C synthesis is the oxidation of l-gulonolactone to l-ascorbic acid by l-gulonolactone oxidase, an enzyme associated with the endoplasmic reticulum membrane and deficient in man, guinea pig and other species due to mutations in its gene. Another fate of glucuronate is its conversion to d-xylulose in a five-step pathway, the pentose pathway, involving identified oxidoreductases and an unknown decarboxylase. Semidehydroascorbate, a major oxidation product of vitamin C, is reconverted to ascorbate in the cytosol by cytochrome b(5) reductase and thioredoxin reductase in reactions involving NADH and NADPH, respectively. Transmembrane electron transfer systems using ascorbate or NADH as electron donors serve to reduce semidehydroascorbate present in neuroendocrine secretory vesicles and in the extracellular medium. Dehydroascorbate, the fully oxidized form of vitamin C, is reduced spontaneously by glutathione, as well as enzymatically in reactions using glutathione or NADPH. The degradation of vitamin C in mammals is initiated by the hydrolysis of dehydroascorbate to 2,3-diketo-l-gulonate, which is spontaneously degraded to oxalate, CO(2) and l-erythrulose. This is at variance with bacteria such as Escherichia coli, which have enzymatic degradation pathways for ascorbate and probably also dehydroascorbate. [less ▲]

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See detailVitamin supplementation by gut symbionts ensures metabolic homeostasis in an insect host
Salem, Hassan; Bauer, Eugen UL; Strauss, Anja S. et al

in Proceedings of the Royal Society B : Biological Sciences (2014), 281(1796), 20141838

Detailed reference viewed: 291 (10 UL)
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See detailLa vitesse de défilement des barres de progression influence-t-elle la perception du temps d’attente ?
Lallemand, Carine UL; Gronier, Guillaume

Scientific Conference (2011, October)

This research focuses on the satisfaction and waiting times perceived by a user during the moments where the interaction between the user and the system is temporarily interrupted (file download, setup of ... [more ▼]

This research focuses on the satisfaction and waiting times perceived by a user during the moments where the interaction between the user and the system is temporarily interrupted (file download, setup of a program, etc.). These waiting times are often sources of anxiety and irritation. They go usually with the presentation of an animated progress bar. The objective of this research is to study the impact of different variable-rate progress bars by varying the speed of scrolling. Thus, we are interested in the effects of acceleration and deceleration between progress bars positions. The results confirm the existence of a causal link between perception of waiting time and satisfaction. In addition, a progress bar with a decelerating speed is significantly more appreciated by the users. The results may provide valuable information for the design of computer interfaces. [less ▲]

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See detailViva vox iuris - oder die juridische Stimme der Literatur. Kafkas Der Proceß und Hoffmanns Der Sandmann im Spiegel der dogmatischen Anthropologie Pierre Legendres
Becker, Katrin UL

Doctoral thesis (2015)

The doctoral dissertation “Viva vox iuris” is aimed at extending the research on law and literature by developping a new perspective, based on Pierre Legendre’s “dogmatic anthropology”. Starting with an ... [more ▼]

The doctoral dissertation “Viva vox iuris” is aimed at extending the research on law and literature by developping a new perspective, based on Pierre Legendre’s “dogmatic anthropology”. Starting with an overview of the current state of research in this field, and based on a detailed presentation of Legendre’s theory, the dissertation develops the hypothesis that the deep entanglement of law and literature confers upon literature the capacity of either reinforcing the effectivity of cultural normativity, or of influencing it in the sense of a modificatory force. The plausibility of this hypothesis is then assessed by a thorough analysis of Kafka’s The Trial and Hoffmann’s The Sandman. The Trial is presented as being a novel that stages the failure of interpretation on the diegetic, hermeneutic as well as the production level, i.e. with regard to the author (– interpretation being, from Legendre’s perspective, the fundamental cultural technique assuring a non-delusional human existence). Being confronted with this failure and the consequent lack of a regime of sense, the reader gains insight, ex negativo, into the necessity of being inscribed, by way of interpretation, into an order of Reference that needs to be mediated by literature and law. With regard to The Sandman, the dissertation undertakes to show, through a combination of the concept of testimony with the dogmatic-anthropological core concepts of alterity and representation, how the fantastical blurring of the limits between reality and fiction, as staged in the novel, provides insights into the contingency of the fundamental structure of the normative order of cultural and subjective identity. [less ▲]

Detailed reference viewed: 157 (18 UL)
See detailVivas in deo. Die Graffiti der frühchristlichen Kirchenanlage in Trier
Binsfeld, Andrea UL

Book published by Bischöfliches Dom- und Diözesanmuseum (2006)

Detailed reference viewed: 151 (0 UL)
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See detailViviane Reding on her action in the field of the information society and media (2004-2010)
Danescu, Elena UL

in Internet Histories: Digital Technology, Culture and Society (2020)

The following pages are taken from a long interview (more than eight hours of footage in total) that Viviane Reding granted us in 2015 in connection with the “Pierre Werner and Europe” research project ... [more ▼]

The following pages are taken from a long interview (more than eight hours of footage in total) that Viviane Reding granted us in 2015 in connection with the “Pierre Werner and Europe” research project. Drawing on more than 40 years’ experience in politics, Viviane Reding spoke about her career, the role of Luxembourg and Luxembourgers in the European integration process, and various key events in which she played a part. In these extracts, she discusses her role as a member of the first and second Barroso Commissions (2004-2009 and 2010-2014) and her efforts to help build an information and knowledge society in Europe, one that serves citizens and protects their rights and fundamental freedoms. Her achievements in this respect include capping mobile phone roaming charges (they were subsequently abolished in 2017), advocating for the introduction of a single emergency number (112) in all EU countries, launching the Europeana digital library, and spearheading a programme to use technological innovation for climate and energy solutions. She also describes the process of developing a Digital Agenda for Europe to improve the continent’s digital competitiveness compared with the United States, China and Japan – a complex and challenging task given the context of globalisation and the divergent interests of the various stakeholders (research, industry, consumers, etc.). Finally, she mentions the reform of personal data protection that she initiated (leading to the GDPR, adopted in April 2016). [less ▲]

Detailed reference viewed: 59 (1 UL)