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See detailElectrospun Composite Liquid Crystal Elastomer Fibers
Sharma, Anshul UL; Lagerwall, Jan UL

in Materials (2018), 11(3), 393

We present a robust method to prepare thin oriented nematic liquid crystalline elastomer-polymer (LCE-polymer) core-sheath fibers. An electrospinning setup is utilized to spin a single solution of photo ... [more ▼]

We present a robust method to prepare thin oriented nematic liquid crystalline elastomer-polymer (LCE-polymer) core-sheath fibers. An electrospinning setup is utilized to spin a single solution of photo-crosslinkable low molecular weight reactive mesogens and a support polymer to form the coaxial LCE-polymer fibers, where the support polymer forms the sheath via in situ phase separation as the solvent evaporates. We discuss the effect of phase separation and compare two different sheath polymers (polyvinylpyrrolidone and polylactic acid), investigating optical and morphological properties of obtained fibers, as well as the shape changes upon heating. The current fibers show only irreversible contraction, the relaxation most likely being hindered by the presence of the passive sheath polymer, increasing in stiffness on cooling. If the sheath polymer can be removed while keeping the LCE core intact, we expect LCE fibers produced in this way to have potential to be used as actuators, for instance in soft robotics and responsive textiles. [less ▲]

See detailAlltagspraktiken in Kindertageseinrichtungen. Eine videographische Studie zur Herstellung eines gemeinsamen Miteinanders von pädagogischen Fachkräften und Kindern
Göbel, Sabrina UL

Doctoral thesis (2018)

Sabrina Göbel untersucht in ihrer Studie, auf welche Art und Weise der Alltag in Kindertageeinrichtungen hergestellt bzw. reproduziert wird. Aus einer praxistheoretischen Perspektive und mithilfe ... [more ▼]

Sabrina Göbel untersucht in ihrer Studie, auf welche Art und Weise der Alltag in Kindertageeinrichtungen hergestellt bzw. reproduziert wird. Aus einer praxistheoretischen Perspektive und mithilfe videographischen Datenmaterials konzentriert sich die qualitativ-rekonstruktive Auswertung auf die Frage nach der Relevanz von wiederkehrenden Praktiken und Routinen für die Herstellung, Gestaltung und Modulation der frühpädagogischen Praxis. Dieses Vorgehen ermöglicht es, ein Verständnis für die sozialen Herstellungspraxen und -prozesse sowie für die dem Alltagsgeschehen zugrunde liegenden impliziten Logiken und Ordnungen der Praxis zu entwickeln. [less ▲]

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See detailHow to know one's experiences transparently
Hofmann, Frank UL

in Philosophical Studies (2018)

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See detailOptimal First-Order Boolean Masking for Embedded IoT Devices
Biryukov, Alex UL; Dinu, Dumitru-Daniel UL; Le Corre, Yann UL et al

in CARDIS 2017: Smart Card Research and Advanced Applications (2018, January 26)

Boolean masking is an effective side-channel countermeasure that consists in splitting each sensitive variable into two or more shares which are carefully manipulated to avoid leakage of the sensitive ... [more ▼]

Boolean masking is an effective side-channel countermeasure that consists in splitting each sensitive variable into two or more shares which are carefully manipulated to avoid leakage of the sensitive variable. The best known expressions for Boolean masking of bitwise operations are relatively compact, but even a small improvement of these expressions can significantly reduce the performance penalty of more complex masked operations such as modular addition on Boolean shares or of masked ciphers. In this paper, we present and evaluate new secure expressions for performing bitwise operations on Boolean shares. To this end, we describe an algorithm for efficient search of expressions that have an optimal cost in number of elementary operations. We show that bitwise AND and OR on Boolean shares can be performed using less instructions than the best known expressions. More importantly, our expressions do no require additional random values as the best known expressions do. We apply our new expressions to the masked addition/subtraction on Boolean shares based on the Kogge-Stone adder and we report an improvement of the execution time between 14% and 19%. Then, we compare the efficiency of first-order masked implementations of three lightweight block ciphers on an ARM Cortex-M3 to determine which design strategies are most suitable for efficient masking. All our masked implementations passed the t-test evaluation and thus are deemed secure against first-order side-channel attacks. [less ▲]

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See detailAugmenting and Structuring User Queries to Support Efficient Free-Form Code Search
Sirres, Raphael; Bissyande, Tegawendé François D Assise UL; Kim, Dongsun et al

in Empirical Software Engineering (2018), 90

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See detailVulnerability analysis of network observability in link flow inference problems
Rinaldi, Marco UL; Viti, Francesco UL

Scientific Conference (2018, January)

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See detailNew insights into the complex role of mitochondria in Parkinson's disease
Grünewald, Anne UL; Kumar, Kishore R; Sue, Carolyn M

in Progress in Neurobiology (2018)

New discoveries providing insights into mitochondrial bioenergetics, their dynamic interactions as well as their role in cellular homeostasis have dramatically advanced our understanding of the ... [more ▼]

New discoveries providing insights into mitochondrial bioenergetics, their dynamic interactions as well as their role in cellular homeostasis have dramatically advanced our understanding of the neurodegenerative process of Parkinson's disease (PD). Respiratory chain impairment is a key feature in sporadic PD patients and there is growing evidence that links proteins encoded by PD-associated genes to disturbances in mitochondrial function. Against the backdrop of latest advances in the development of PD treatments that target mitochondria, we aim to give an overview of the literature published in the last three decades on the significance of mitochondria in the pathogenesis of PD. We describe the contribution of mitochondrial genome alterations and PD-associated genes to mitochondrial maintenance. We highlight mitophagy as a key mechanism in neurodegeneration. Moreover, we focus on the reciprocal interaction between alpha-synuclein aggregation and mitochondrial dysfunction. We discuss a novel trafficking pathway involving mitochondrial-derived vesicles within the context of PD and provide a synopsis of the most recently emerging topics in PD research with respect to mitochondria. This includes the relationship between mitochondria and cell-mediated immunity, the ER-mitochondria axis, sirtuin-mediated mitochondrial stress response and the role of micro RNAs in the aetiology of PD. In addition, recent studies have challenged the neuro-centric view of PD pathology, moving microglia and astrocytes into the research spotlight. Greater insights into these mechanisms may hold the key for the development of novel targeted therapies, addressing the need for a disease-modifying treatment, which has remained elusive to date. [less ▲]

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See detailIs A Vertical Flow Constructed Wetland A Suitable Polishing Treatment For Micropollutant Removal In Medium-sized WWTPs? A Case Of Study
Venditti, Silvia UL; Hansen, Joachim UL

in 16th IWA Wetland System for Water Pollution Control, ICWS2018 (2018)

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See detailDie Erweiterung von Konzepten und Definitionen von Suchtverhalten
Billieux, Joël UL; Vögele, Claus UL

in Verhaltenstherapie (2018), 28(4), 209-211

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See detailUnconventional superconductivity in the extended Hubbard model: Weak-coupling renormalization group
Wolf, Sebastian; Schmidt, Thomas UL; Rachel, Stephan

in Physical Review. B, Condensed Matter and Materials Physics (2018)

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See detailEinleitung. Wer hat Angst vor Genderforschung?
Goetzinger, Germaine; Kmec, Sonja UL; Roster, Danielle et al

in Goetzinger, Germaine; Kmec, Sonja; Roster, Danielle (Eds.) et al Mit den Haien streiten. Frauen und Gender in Luxemburg seit 1940 / Femmes et genre au Luxembourg depuis 1940 (2018)

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See detailConnections adapted to non-negatively graded structure
Bruce, Andrew UL

in International Journal of Geometric Methods in Modern Physics (2018)

Graded bundles are a particularly nice class of graded manifolds and represent a natural generalization of vector bundles. By exploiting the formalism of supermanifolds to describe Lie algebroids, we ... [more ▼]

Graded bundles are a particularly nice class of graded manifolds and represent a natural generalization of vector bundles. By exploiting the formalism of supermanifolds to describe Lie algebroids, we define the notion of a weighted A-connection on a graded bundle. In a natural sense weighted A-connections are adapted to the basic geometric structure of a graded bundle in the same way as linear A-connections are adapted to the structure of a vector bundle. This notion generalizes directly to multi-graded bundles and in particular we present the notion of a bi-weighted A-connection on a double vector bundle. We prove the existence of such adapted connections and use them to define (quasi-)actions of Lie algebroids on graded bundles. [less ▲]

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See detailResource Allocation Approach for Differential Doppler Reduction in NB-IoT over LEO Satellite
Kodheli, Oltjon UL; Andrenacci, Stefano UL; Maturo, Nicola UL et al

in 9th Advanced Satellite Multimedia Systems Conference (ASMS) and 15th Signal Processing for Space Communications Workshop (SPSC), Berlin, Germany, 10-12 September 2018 (2018)

Internet of things (IoT) over satellite is an attractive system architecture which has been proposed as a key-enabling technology, to extend the coverage in remote areas (e.g. desert, ocean, forest, etc ... [more ▼]

Internet of things (IoT) over satellite is an attractive system architecture which has been proposed as a key-enabling technology, to extend the coverage in remote areas (e.g. desert, ocean, forest, etc), particularly where a terrestrial network is impossible or impractical to reach. One of the most promising technologies that fit the IoT vision of low-power, wide area networks (LPWAN) is the narrowband IoT (NB-IoT). While low earth orbit (LEO) satellites are favourable because of their lower round trip time (RTT) and lower propagation loss in the communication link, they come up with a significantly increased Doppler shift. In our NB-IoT over LEO satellite architecture, we identify the problem of high differential Doppler among channels of different users on Earth, which leads to the performance degradation of our system. In this paper, we propose a resource allocation approach in order to reduce the high values of differential Doppler under the maximum value supported by the standard itself. [less ▲]

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See detailCrypren Decryptor
Genç, Ziya Alper UL

Software (2018)

Crypren Decryptor is software which recovers the files encrypted by Crypren ransomware. The decryptor targets the sample with SHA256 digest ... [more ▼]

Crypren Decryptor is software which recovers the files encrypted by Crypren ransomware. The decryptor targets the sample with SHA256 digest: ce53233a435923a68a9ca6987f0d6333bb97d5a435b942d20944356ac29df598. Further details about the design of this software can be found at the paper: http://orbilu.uni.lu/handle/10993/36627. [less ▲]

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See detailCultivating Children and Youth: Transnational Explorations of the Urban and the Natural
Allender, Tim; Dussel, Inés; Grosvenor, Ian et al

Scientific Conference (2018)

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See detailNext Generation Cryptographic Ransomware
Genç, Ziya Alper UL; Lenzini, Gabriele UL; Ryan, Peter UL

in Secure IT Systems: 23rd Nordic Conference, NordSec 2018, Oslo, Norway, November 28-30, 2018, Proceedings (2018)

We are assisting at an evolution in the ecosystem of cryptoware - the malware that encrypts files and makes them unavailable unless the victim pays up. New variants are taking the place once dominated by ... [more ▼]

We are assisting at an evolution in the ecosystem of cryptoware - the malware that encrypts files and makes them unavailable unless the victim pays up. New variants are taking the place once dominated by older versions; incident reports suggest that forthcoming ransomware will be more sophisticated, disruptive, and targeted. Can we anticipate how such future generations of ransomware will work in order to start planning on how to stop them? We argue that among them there will be some which will try to defeat current anti-ransomware; thus, we can speculate over their working principle by studying the weak points in the strategies that seven of the most advanced anti-ransomware are currently implementing. We support our speculations with experiments, proving at the same time that those weak points are in fact vulnerabilities and that the future ransomware that we have imagined can be effective. [less ▲]

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See detailAn Interactive and Active Collective: Media as Relational and Entangled Objects
Bischof, Marco; Priem, Karin UL

Scientific Conference (2018)

This paper draws upon different media, their contents, close relationships to lived life, and the memories and stories evolving around them. Challenging linear historical time, the paper looks at the ... [more ▼]

This paper draws upon different media, their contents, close relationships to lived life, and the memories and stories evolving around them. Challenging linear historical time, the paper looks at the interconnectedness of different media and how these connections and constellations shape histories. The different media analysed in this paper are perceived as an interactive and active collective of “ongoing moments” (Dyer 2007) and nodes that reinforce each other and relate to different audiences (e.g., Edwards 2009). As both performances of the past and living objects triggering memories and the making of histories, our source materials cover approximately seventy years and refer to a broad array of actors, experiences, relationships, places, and spaces within the wider context of the work of the Swiss Magnum photographer Werner Bischof who was commissioned by Schweizer Spende to travel war-ravaged Europe after the Second World War. More particularly, the paper concentrates on how a photographic portrait of a Dutch boy, Jo Corbey, taken in the town of Roermond in 1945, came to life, why and how it was made, and how it circulated and got entangled with other media in a meshwork of meaning making (e.g., Ingold 2015). Materials and sources discussed include Bischof’s diary entries, drawings, and contact sheets, the May 1946 issue of the Swiss monthly Du dedicated to Schweizer Spende, family photographs and newspaper clippings, as well as a 2010 photography exhibition (plus catalogue) in Helmond, Holland, and a 2011 interview with Corbey’s twin brother and sisters, which was recorded by Marco Bischof, co-presenter of this paper. Thematically, we will focus on the story of Corbey’s identification and the different stories that evolved around his life, and discuss the involvement of different actors as a collective or inter-relational conglomerate of media and humans who added their own stories, rationales, and memories. The image appeared in different print formats, was shown in exhibitions, and inspired TV shows and films while at the same time initiating debates on children and war, promoting humanitarian action, triggering memories of the past, and helping to break silences on war experiences. In sum, the paper will demonstrate how media travel back and forth between the margins and the center of history by virtue of their relational qualities as social objects. [less ▲]

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See detailThe image of Industrial Life and Vocational Training: Scouting as Liminal Learning Space (Luxembourg, 1920s)
Hermann, Frederik; Priem, Karin UL

Scientific Conference (2018)

While there is a large body of research on corporate photography, little has been written about the visualisation of young workers. This paper looks at a specific set of corporate images, namely ... [more ▼]

While there is a large body of research on corporate photography, little has been written about the visualisation of young workers. This paper looks at a specific set of corporate images, namely photographs of apprentices of the Luxembourg steel-manufacturing conglomerate ARBED, and analyses how these young workers were visualised. The paper draws on a collection of approximately 2,250 glass plate negatives of ARBED’s industrial cosmos, originally stored at the company’s vocational school, the Institut Emile Metz, and now archived at Luxembourg’s Centre national de l’audivisuel (CNA). The roughly 160 images of young apprentices contained in the collection put on display the apprentices’ bodies and activities in various contexts and environments – in the classroom, the school yard, and the gym; in workshops and the institute’s psychophysiological laboratory; at the Belgian coast, in Luxembourg’s forests, and in urban spaces like London. A selected number of images were published in promotional brochures, showcasing these places, spaces, and activities and their different levels of “cultured” and “natural” properties. Thematically, the paper concentrates on (1) corporate photography as a means of identity formation by depicting apprentices in various places and spaces; (2) the creation of workers as cultured men and ideally educated workers through a diversity of recreational activities; and, most importantly, (3) the question of how leisure activities served as liminal spaces to stabilise the work sphere and how social and cultural belonging was visually forged between urban and natural landscapes, between industrialisation and ‘nature’ in order to make apprentices fit for Western industrialised societies. The images and their contents testify to a constant mix and re-mix of different learning environments intended to educate the natural, urban, mobile, and communal future worker in order to achieve societal harmony – also by including pre-industrial spaces and open-air activities as liminal spaces for experimentation that were set apart from the profane while mitigating the risks of industrialisation. [less ▲]

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