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See detailUntersuchungen zur Oberflächenqualität von Selbstverdichtendem Beton
Weisheit; Waldmann, Danièle UL; Greger, Manfred UL

Scientific Conference (2010)

Detailed reference viewed: 33 (4 UL)
See detailUntersuchungen zur regionalen Färbung der Intonation des Standarddeutschen. Diskussion eines methodischen Zugangs
Gilles, Peter UL

in Wiesinger, Peter (Ed.) Akten des X. Internationalen Germanistenkongresses (2002)

Detailed reference viewed: 65 (0 UL)
See detailUntersuchungen zur Struktur und Funktion regionalspezifischer Intonationsverläufe im Deutsche. Rückblick auf ein Forschungsprojekt
Peters, Jörg; Auer, Peter; Gilles, Peter UL et al

in Kehrein, Roland; Lameli, Alfred; Rabanus, Stefan (Eds.) Regionale Variation des Deutschen. Projekte und Perspektiven (2015)

Detailed reference viewed: 122 (3 UL)
See detailUntersuchungskommissionen in den USA, Grossbritannien und der Bundesrepublik Deutschland
Willems, Helmut UL

in Willems, Helmut; Wolf, Marianne (Eds.) Soziale Unruhen und Politikberatung:Funktion, Arbeitsweise, Ergebnisse und Auswirkungen von Untersuchungskommissionen in den USA, Großbritannien und der Bundesrepublik (1993)

Detailed reference viewed: 48 (0 UL)
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See detail„Untote Buchstaben“: Heinrich Heine, die romantische Schule und die Entdeckung des Populären
Dembeck, Till UL

in Chiarini, Paolo; Hinderer, Walter (Eds.) Heinrich Heine. Ein Wegbereiter der Moderne (2010)

Detailed reference viewed: 82 (1 UL)
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Peer Reviewed
See detailUntraceability of RFID Protocols
van Deursen, Ton UL; Mauw, Sjouke UL; Radomirovic, Sasa UL

in Information Security Theory and Practices. Smart Devices, Convergence and Next Generation Networks (2008)

Detailed reference viewed: 66 (0 UL)
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See detailUntraceable VoIP Communication based on DC-nets
Franck, Christian UL; Sorger, Ulrich UL

E-print/Working paper (2016)

Untraceable communication is about hiding the identity of the sender or the recipient of a message. Currently most systems used in practice (e.g., TOR) rely on the principle that a message is routed via ... [more ▼]

Untraceable communication is about hiding the identity of the sender or the recipient of a message. Currently most systems used in practice (e.g., TOR) rely on the principle that a message is routed via several relays to obfuscate its path through the network. However, as this increases the end-to-end latency it is not ideal for applications like Voice-over-IP (VoIP) communication, where participants will notice annoying delays if the data does not arrive fast enough. We propose an approach based on the paradigm of Dining Cryptographer networks (DC-nets) that can be used to realize untraceable communication within small groups. The main features of our approach are low latency and resilience to packet-loss and fault packets sent by malicious players. We consider the special case of VoIP communication and propose techniques for a P2P implementation. We expose existing problems and sketch possible future large-scale systems composed of multiple groups. [less ▲]

Detailed reference viewed: 101 (7 UL)
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See detailAn unusual insertion in Jak2 is crucial for kinase activity and differentially affects cytokine responses
Haan, Claude UL; Kroy, Daniela C.; Wüller, Stefan et al

in Journal of Immunology (2009), 182(5), 2969-2977

The Janus kinases, Jaks, constitutively associate with the cytoplasmic region of cytokine receptors and play an important role in a multitude of biological processes. Jak2 dysfunction has been implicated ... [more ▼]

The Janus kinases, Jaks, constitutively associate with the cytoplasmic region of cytokine receptors and play an important role in a multitude of biological processes. Jak2 dysfunction has been implicated in myeloproliferative diseases and leukemia. Although Jaks were studied extensively for many years, the molecular mechanism of Jak activation upon cytokine stimulation of cells is still incompletely understood. In this study, we investigated the importance of an unusual insertion located within the kinase domain in Jak2. We found that the deletion of this insertion, which we named the Jak-specific insertion (JSI), totally abrogates Jak2 autophosphorylation. We further point mutated four residues within the JSI that are conserved in all Jak family members. Three of these mutants showed abrogated or reduced autophosphorylation, whereas the fourth displayed increased autophosphorylation. We found that the phosphorylation state of these mutants is not influenced by other domains of the kinase. Our data further suggest that the JSI is not required for the negative regulation of kinase activity by the suppressor of cytokine signaling proteins, SOCS. Most importantly, we show that mutations in this region differentially affect IFN-gamma and erythropoietin signal transduction. Taken together, the dramatic effects on the phosphorylation status of Jak2 as well as the differential effects on the signaling via different cytokines highlight the importance of this unusual region for the catalytic activity of Jaks. [less ▲]

Detailed reference viewed: 77 (4 UL)
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See detailAn unusual neurological syndrome of crawling gait, dystonia, pyramidal signs, and limited speech.
Arif, Beenish; Grünewald, Anne UL; Fatima, Amara et al

in Movement disorders : official journal of the Movement Disorder Society (2011), 26(12), 2279-83

BACKGROUND: The purpose of the study was to identify and molecularly characterize a neurological syndrome in a consanguineous Pakistani family. METHODS: Five patients, their 2 siblings, and their parents ... [more ▼]

BACKGROUND: The purpose of the study was to identify and molecularly characterize a neurological syndrome in a consanguineous Pakistani family. METHODS: Five patients, their 2 siblings, and their parents were clinically examined. DNA from all 7 siblings was genotyped with Affymetrix SNP arrays and sequencing of selected candidate genes. RESULTS: An unusual neurological syndrome of crawling gait, predominant leg dystonia, pyramidal signs, microcephaly, and suspected deafness segregated in the family. Three patients ambulated on hands and knees, either by hopping and crossing their legs, or by dragging the legs behind them. Two patients have acquired the ability to walk bipedally with a dystonic gait. Unexpectedly, no chromosomal region was homozygous in patients only. Under different disease models, we localized 7 chromosomal regions in the genome common to all patients. No pathogenic mutations were identified in selected candidate genes or the mitochondrial genome. CONCLUSION: We describe an unusual movement disorder syndrome reminiscent of but distinct from Uner Tan syndrome. [less ▲]

Detailed reference viewed: 59 (1 UL)
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See detailUnwrapping some euro area growth puzzles: Factor substitution, productivity and unemployment
Klump, Rainer UL; McAdam, Peter; Willman, Alpo

in JOURNAL OF MACROECONOMICS (2008), 30(2), 645-666

In this paper, we estimate a long run supply-side system incorporating a CES production function with time-varying factor-augmenting technical progress for the euro area over the period 1970-2005. We find ... [more ▼]

In this paper, we estimate a long run supply-side system incorporating a CES production function with time-varying factor-augmenting technical progress for the euro area over the period 1970-2005. We find that the elasticity of substitution lies below unity at 0.7, that labor-augmenting technical progress is dominant in the long run while capital-augmenting technical progress plays an important role in the interim period. Importantly, we also find evidence of a structural break in the pattern of biased technical progress towards the end of the 1990s. Our results help to solve two puzzles in Europe's recent growth experience which differ markedly from the US experience. The first is related to the effects of the IT boom in the 1990s on productivity growth in Europe. The second puzzle concerns the changes in the "Okun's law" relationship, linking growth to the reduction of unemployment, which are observable in Europe since the late 1990s. (C) 2007 Published by Elsevier Inc. [less ▲]

Detailed reference viewed: 41 (0 UL)
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See detailuORFdb--a comprehensive literature database on eukaryotic uORF biology.
Wethmar, Klaus; Barbosa Da Silva, Adriano UL; Andrade-Navarro, Miguel A. et al

in Nucleic acids research (2014), 42(1), 60-7

Approximately half of all human transcripts contain at least one upstream translational initiation site that precedes the main coding sequence (CDS) and gives rise to an upstream open reading frame (uORF ... [more ▼]

Approximately half of all human transcripts contain at least one upstream translational initiation site that precedes the main coding sequence (CDS) and gives rise to an upstream open reading frame (uORF). We generated uORFdb, publicly available at http://cbdm.mdc-berlin.de/tools/uorfdb, to serve as a comprehensive literature database on eukaryotic uORF biology. Upstream ORFs affect downstream translation by interfering with the unrestrained progression of ribosomes across the transcript leader sequence. Although the first uORF-related translational activity was observed >30 years ago, and an increasing number of studies link defective uORF-mediated translational control to the development of human diseases, the features that determine uORF-mediated regulation of downstream translation are not well understood. The uORFdb was manually curated from all uORF-related literature listed at the PubMed database. It categorizes individual publications by a variety of denominators including taxon, gene and type of study. Furthermore, the database can be filtered for multiple structural and functional uORF-related properties to allow convenient and targeted access to the complex field of eukaryotic uORF biology. [less ▲]

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See detailUpAM: UPCYCLING VIA ADDITIVE MANUFACTURING – HOW 3D PRINTING CAN ENHANCE CIRCULAR ECONOMY
Wolf, Claude UL; Kedziora, Slawomir UL

in REVUE TECHNIQUE LUXEMBOURGEOISE (2017), 2017(2), 38

The University of Luxembourg developed the project upAM upcycling using Additive Manufacturing with the cooperation of FabLab Belval and Luxinnovation. This project was partially financed by Luxembourg ... [more ▼]

The University of Luxembourg developed the project upAM upcycling using Additive Manufacturing with the cooperation of FabLab Belval and Luxinnovation. This project was partially financed by Luxembourg National Research Fund Luxembourg (FNR). An alternative to a linear economy: extracting raw materials, producing, consuming, and discarding of a product, there is another option: Circular Economy (CE): reusing products, repairing, recycling, and upcycling. A concept of a system/process (upAM) is developed to reuse unwanted or un-functional polymers issued from existing products/ systems. Waste prints can be re-printed into new products or systems with the same / higher quality or value than products created from raw materials. The upAM project is, therefore, concentrating on upcycling according to the definition given by author” Upcycling is a process in which used materials are converted into something of a higher value and/or quality in their second life”. This definition is simple and reflects fully the meaning of the upcycling process. This idea is not new; the concept of reused materials/products giving them a new life has been present for hundreds of years as a countermeasure against the lack of raw materials. At the moment, the situation in developed countries is evolving. Society is more aware that unlimited consumption leads to unlimited production of waste. Therefore, collective consciousness of a circular economy occurs, which supports greater resources of productivity aiming to reduce waste and avoid pollution by design, and purposeful reused waste materials and unwanted products. Upcycling via additive manufacturing could be an important part of the circular economy (CE). Obviously, the CE and especially the upcycling process lead to reducing the usage of new raw materials, and it results in a reduction of energy usage, air and water pollution and even greenhouse gas emissions. The development of maker movement and democratisation of FDM technology is also strongly influencing the needs and benefits of the upcycling process. The project upAM is developed to increase this idea so that any individual can produce their products with a higher added value using recycled raw materials via the open technology of FDM 3D Printer. [less ▲]

Detailed reference viewed: 352 (18 UL)
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See detailUpcycling polymers: a revolutionary approach to promoting the circular economy
Wolf, Claude UL; Kedziora, Slawomir UL

in Impact (2018), 2018(Number 9), 103-1053

The UPcycling using Additive Manufacturing (UpAM) project seeks to introduce an innovative educational and interactive framework to demonstrate the benefits of upcycling so that any individual can produce ... [more ▼]

The UPcycling using Additive Manufacturing (UpAM) project seeks to introduce an innovative educational and interactive framework to demonstrate the benefits of upcycling so that any individual can produce their own products using recycled raw materials. For years, societies have been aware that the unlimited consumption of products is unavoidably intertwined with the unlimited production of waste. This is exactly why scientists and researchers have been trying to find alternative and meaningful solutions to the Linear Economy model, a model that dictates a specific sequence of events: extracting raw materials, manufacturing products, consuming and discarding these products. Looking beyond that ‘take, make, dispose’ approach, it was in 1989 that the notion of Circular Economy (CE) was first proposed by Pearce and Turner; a concept that is restorative and regenerative and that involves reusing products, repairing, recycling and upcycling. Therefore, the core element of this innovative and environmentally-friendly model is to rely on system-wide innovative processes in order to redefine products, services and, most importantly, our way of thinking, to design waste out, thus allowing a profound transition to renewable energy sources [less ▲]

Detailed reference viewed: 116 (16 UL)
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See detailUpdatable Functional Encryption
Arriaga, Afonso; Iovino, Vincenzo UL; Tang, Qiang

in Paradigms in Cryptology – Mycrypt 2016. Malicious and Exploratory Cryptology (2016, December)

Functional encryption (FE) allows an authority to issue tokens associated with various functions, allowing the holder of some token for function f to learn only f(𝖣)f(D) from a ciphertext that encrypts ... [more ▼]

Functional encryption (FE) allows an authority to issue tokens associated with various functions, allowing the holder of some token for function f to learn only f(𝖣)f(D) from a ciphertext that encrypts 𝖣D . The standard approach is to model f as a circuit, which yields inefficient evaluations over large inputs. Here, we propose a new primitive that we call updatable functional encryption (UFE), where instead of circuits we deal with RAM programs, which are closer to how programs are expressed in von Neumann architecture. We impose strict efficiency constrains in that the run-time of a token 𝖯⎯⎯⎯P¯ on ciphertext 𝖢𝖳CT is proportional to the run-time of its clear-form counterpart (program 𝖯P on memory 𝖣D ) up to a polylogarithmic factor in the size of 𝖣D , and we envision tokens that are capable to update the ciphertext, over which other tokens can be subsequently executed. We define a security notion for our primitive and propose a candidate construction from obfuscation, which serves as a starting point towards the realization of other schemes and contributes to the study on how to compute RAM programs over public-key encrypted data. [less ▲]

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See detailUpdatable Functional Encryption
Delerue Arriaga, Afonso UL; Iovino, Vincenzo UL; Tang, Qiang

in Paradigms in Cryptology - Mycrypt 2016. Malicious and Exploratory Cryptology, Second International Conference, Mycrypt 2016, Kuala Lumpur, Malaysia, December 1-2, 2016, Revised Selected Papers (2016)

Functional encryption (FE) allows an authority to issue tokens associated with various functions, allowing the holder of some token for function f to learn only f(D) from a ciphertext that encrypts D. The ... [more ▼]

Functional encryption (FE) allows an authority to issue tokens associated with various functions, allowing the holder of some token for function f to learn only f(D) from a ciphertext that encrypts D. The standard approach is to model f as a circuit, which yields inefficient evaluations over large inputs. Here, we propose a new primitive that we call updatable functional encryption (UFE), where instead of circuits we deal with RAM programs, which are closer to how programs are expressed in von Neumann architecture. We impose strict efficiency constrains in that the run-time of a token P' on ciphertext CT is proportional to the run-time of its clear-form counterpart (program P on memory D) up to a polylogarithmic factor in the size of D, and we envision tokens that are capable to update the ciphertext, over which other tokens can be subsequently executed. We define a security notion for our primitive and propose a candidate construction from obfuscation, which serves as a starting point towards the realization of other schemes and contributes to the study on how to compute RAM programs over public-key encrypted data. [less ▲]

Detailed reference viewed: 128 (6 UL)
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See detailUpdate Internationales und Europäisches IT-Steuerrecht
Sinnig, Julia UL

Presentation (2019, September 14)

Detailed reference viewed: 32 (0 UL)
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See detailUpdate Internationales und Europäisches Steuerrecht
Sinnig, Julia UL

in Taeger, Jürgen (Ed.) Tagungsband Herbstakademie 2019 (in press)

Im Juni 2019 stellte die Organisation für wirtschaftliche Zusammenarbeit und Entwicklung (OECD) das Arbeitsprogramm zur weiteren Ausarbeitung einer Anpassung des internationalen Ertragsteuerrechts an die ... [more ▼]

Im Juni 2019 stellte die Organisation für wirtschaftliche Zusammenarbeit und Entwicklung (OECD) das Arbeitsprogramm zur weiteren Ausarbeitung einer Anpassung des internationalen Ertragsteuerrechts an die neue wirtschaftliche Realität der digitalisierten Welt vor. Auf Ebene der Europäischen Union (EU) gilt die Verabschiedung der im März 2018 von der Europäischen Kommission vorgestellten Richtlinien-Vorschläge (RL-Vorschläge) zu einer Digitalsteuer und einer sog. signifikanten digitalen Präsenz, nach intensiver Diskussion im Rat, als unwahrscheinlich. Der Gerichtshof der Europäischen Union beschäftigt sich derzeit mit der unionsrechtlichen Vereinbarkeit nationaler Sonderabgaben, die umsatzbasiert erhoben werden. Dieser Beitrag bietet einen Überblick über wesentliche Entwicklungen im internationalen und europäischen Steuerrecht bzgl. der Besteuerung digitalisierter Unternehmen. Der Beitrag knüpft an den Vortrag von Prof. Dr. Jens M. Schmittmann und der Verfasserin anlässlich der Herbstakademie 2018 in Bochum, sowie dem Vortrag der Verfasserin anlässlich der Herbstakademie 2017 in Heidelberg an. [less ▲]

Detailed reference viewed: 66 (2 UL)