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See detailJoint signature of two or more systems with applications to multistate systems made up of two-state components
Marichal, Jean-Luc UL; Mathonet, Pierre; Navarro, Jorge et al

in European Journal of Operational Research (2017), 263(2), 559-570

The structure signature of a system made up of n components having continuous and i.i.d. lifetimes was defined in the eighties by Samaniego as the n-tuple whose k-th coordinate is the probability that the ... [more ▼]

The structure signature of a system made up of n components having continuous and i.i.d. lifetimes was defined in the eighties by Samaniego as the n-tuple whose k-th coordinate is the probability that the k-th component failure causes the system to fail. More recently, a bivariate version of this concept was considered as follows. The joint structure signature of a pair of systems built on a common set of components having continuous and i.i.d. lifetimes is a square matrix of order n whose (k,l)-entry is the probability that the k-th failure causes the first system to fail and the l-th failure causes the second system to fail. This concept was successfully used to derive a signature-based decomposition of the joint reliability of the two systems. In the first part of this paper we provide an explicit formula to compute the joint structure signature of two or more systems and extend this formula to the general non-i.i.d. case, assuming only that the distribution of the component lifetimes has no ties. We also provide and discuss a necessary and sufficient condition on this distribution for the joint reliability of the systems to have a signature-based decomposition. In the second part of this paper we show how our results can be efficiently applied to the investigation of the reliability and signature of multistate systems made up of two-state components. The key observation is that the structure function of such a multistate system can always be additively decomposed into a sum of classical structure functions. Considering a multistate system then reduces to considering simultaneously several two-state systems. [less ▲]

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See detailEnergy, Risk and Governance: The Case of Nuclear Energy in India
Wong, Catherine UL

Book published by Palgrave Macmillan (2017)

This book is about how risk, energy and governance are intertwined in the development of the nuclear industry in India and its relationship with the Indian public. It provides a rare insider-view of how ... [more ▼]

This book is about how risk, energy and governance are intertwined in the development of the nuclear industry in India and its relationship with the Indian public. It provides a rare insider-view of how the nuclear establishment thinks about risk and contrasts that with public understandings of nuclear risk. Through that, the book presents a more nuanced picture of why nuclear energy is considered a rational choice in spite of the risks; the ambiguities in both expert and public risk perceptions; and the internal reflexivities that have emerged within the nuclear establishment as a result of the Fukushima-Daiichi disaster which are not displayed in the public discourse. The insights in this book are not unique to India and similar observations can easily be made in the global nuclear industry. Reflecting on what this means for risk governance in practice, the book proposes a toolkit that practitioners in the nuclear industry can use in public engagement, risk communication and deliberation at various stages of decision-making. [less ▲]

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See detailValue-Added Modelling in Primary and Secondary School: An Integrative Review of 674 Publications
Levy, Jessica UL; Keller, Ulrich UL; Brunner, Martin et al

Scientific Conference (2017, December)

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See detailA Framework for Optimizing Multi-cell NOMA: Delivering Demand with Less Resource
You, Lei; Lei, Lei UL; Yuan, Di et al

in 2017 IEEE Global Communications Conference (GLOBECOM) (2017, December)

Non-orthogonal multiple access (NOMA) allows multiple users to simultaneously access the same time-frequency resource by using superposition coding and successive interference cancellation (SIC). Thus far ... [more ▼]

Non-orthogonal multiple access (NOMA) allows multiple users to simultaneously access the same time-frequency resource by using superposition coding and successive interference cancellation (SIC). Thus far, most papers on NOMA have focused on performance gain for one or sometimes two base stations. In this paper, we study multi-cell NOMA and provide a general framework for user clustering and power allocation, taking into account inter-cell interference, for optimizing resource allocation of NOMA in multi-cell networks of arbitrary topology. We provide a series of theoretical analysis, to algorithmically enable optimization approaches. The resulting algorithmic notion is very general. Namely, we prove that for any performance metric that monotonically increases in the cells’ resource consumption, we have convergence guarantee for global optimum. We apply the framework with its algorithmic concept to a multi-cell scenario to demonstrate the gain of NOMA in achieving significantly higher efficiency. [less ▲]

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See detailLuxembourg Analysis
Danescu, Elena UL; Kmec, Sonja UL

in Hartley, Cathy (Ed.) WESTERN EUROPE 2018 (2017)

With a long tradition of political stability and social democracy, a creative development model, skilled human capital and a culture of consensus, Luxembourg is at the forefront of Europe. Its main ... [more ▼]

With a long tradition of political stability and social democracy, a creative development model, skilled human capital and a culture of consensus, Luxembourg is at the forefront of Europe. Its main strategic challenge is how to achieve economic diversification while maintaining the sustainability of the Luxembourg social model. The country has embarked on the "third industrial revolution", with innovation as the main driver of sustainable growth and the University of Luxembourg as a major player. [less ▲]

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See detailBritain, the US and Greece after World War II: Anglo-American Relations and the Cold War
Paravantis, Spero UL

Book published by IB Tauris - 1st (2017)

This Book provides a new analysis of the role that the British played in the shift in American foreign policy from 1946 to 1950. To achieve this shift (which also included support of British strategic ... [more ▼]

This Book provides a new analysis of the role that the British played in the shift in American foreign policy from 1946 to 1950. To achieve this shift (which also included support of British strategic interests in the Eastern Mediterranean) this book argues that the British used Greece, first as a way to draw the United States further into European affairs, and then as a way to anchor the United States in Europe, achieving a guarantee of security of the Eastern Mediterranean and of Western Europe. While trying to understand and explain the origins and dynamics of Anglo-American foreign policy in the pre and early years of the Cold War, the role that perception played in the design and implementation of foreign policy became a central focus of the research. From this point came the realization of a general lack of emphasis and research into the ways in which the British government managed to convince the United States government to assume support for worldwide British strategic objectives. How this support was achieved is the central theme of this book. It also addresses the question of whether or not Anglo-American policy was simply a convergence of common Anglo-American objectives, or if it was a result of common objectives created by British influence? To support these hypotheses, this work uses mainly the British and American documents relating to Greece from 1946 to 1950 to explain how these nations made and implemented policy towards Greece during this crucial period in history. In so doing it also explains how American foreign policy in general changed from its pre-war focus on non-intervention, to the post-war policy which heavily favours intervention. [less ▲]

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See detailL’événement énonciatif en sémiotique de l’image : de Roland Barthes à la sémiotique tensive
Colas-Blaise, Marion UL; Dondero, Maria Giulia

in La part de l'oeil (2017)

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See detailTaxation at the Crossroads of Fundamental Rights and Fundamental Freedoms in the EU
Haslehner, Werner UL

in Haslehner, Werner; Kofler, Georg; Rust, Alexander (Eds.) EU Tax Law and Policy in the 21st Century (2017)

After nearly thirty years of dormancy with respect to direct taxation matters, the EU fundamental freedoms have been gradually accepted as a major determinant of the Member States’ freedom to impose to ... [more ▼]

After nearly thirty years of dormancy with respect to direct taxation matters, the EU fundamental freedoms have been gradually accepted as a major determinant of the Member States’ freedom to impose to taxes. Today, the power of the freedoms to limit the Member States’ competence in this area of law is accepted without question. At the same time, EU fundamental rights have, to date, played almost no role at all with respect to tax matters, let alone direct tax matters, although they were already recognized as constituent elements of primary EU law by the Court of Justice of the European Union (the Court or the CJEU) in the 1960s. This dichotomy is remarkable, not least because it is difficult to neatly disentangle fundamental freedoms from fundamental rights, as the former may well be seen as a subset of the latter. This contribution explores the doctrinal underpinnings of their existing similarities and differences as well as the interaction of both, in order to offer an explanation for the seemingly contradictory perception of both fundamental bases of primary EU law. In so doing, it will address the following questions: What is the relationship between fundamental rights and fundamental freedoms? To what extent do they limit or reinforce each other? Why has the CJEU not brought EU fundamental rights to bear in its jurisprudence on direct taxation thus far? Can or should the CJEU be more active in this respect? Thus, this contribution, first, briefly recounts the development of EU fundamental rights and fundamental freedoms and the doctrinal underpinnings of this development as a basis to analyse the scope of both components of primary law and their relationship to one another. Second, it analyses the similarities and relevant differences between fundamental rights and fundamental freedoms and suggests an answer to the question of the extent to which the fundamental freedoms can or should be considered to be fundamental rights. Finally, it assesses the application of fundamental rights in direct tax cases by looking at the clues the CJEU has left in the very little case law available with implications for this question. [less ▲]

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See detailOptical Feeder Links Study towards Future Generation MEO VHTS Systems
Mengali, Alberto UL; Lyras, Nikos K.; Shankar, Bhavani UL et al

in Proceedings of the 35th AIAA International Communications Satellite Systems Conference (ICSSC) (2017, October)

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See detailDrama und Interkulturalität
Bloch, Natalie UL; Heimböckel, Dieter UL

in Englhart, Andreas; Schößler, Franziska (Eds.) Grundthemen der Literaturwissenschaft: Drama (2017)

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See detailEstimating Urban Road Traffic States Using Mobile Network Signaling Data
Derrmann, Thierry UL; Frank, Raphaël UL; Viti, Francesco UL et al

in Derrmann, Thierry; Frank, Raphaël; Viti, Francesco (Eds.) et al Estimating Urban Road Traffic States Using Mobile Network Signaling Data (2017, October)

It is intuitive that there is a causal relationship between human mobility and signaling events in mobile phone networks. Among these events, not only the initiation of calls and data sessions can be used ... [more ▼]

It is intuitive that there is a causal relationship between human mobility and signaling events in mobile phone networks. Among these events, not only the initiation of calls and data sessions can be used in analyses, but also handovers between different locations that reflect mobility. In this work, we investigate if handovers can be used as a proxy metric for flows in the underlying road network, especially in urban environments. More precisely, we show that characteristic profiles of handovers within and between clusters of mobile network cells exist. We base these profiles on models from road traffic flow theory, and show that they can be used for traffic state estimation using floating-car data as ground truth. The presented model can be beneficial in areas with good mobile network coverage but low road traffic counting infrastructure, e.g. in developing countries, but also serve as an additional predictor for existing traffic state monitoring systems. [less ▲]

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See detailCharacterizing Driving Environments Through Bluetooth Discovery
Bronzi, Walter UL; Faye, Sébastien UL; Frank, Raphaël UL et al

Scientific Conference (2017, October)

Within the world of wireless technologies, Bluetooth has recently been at the forefront of innovation. It is becoming increasingly relevant for vehicles to become aware of their surroundings. Therefore ... [more ▼]

Within the world of wireless technologies, Bluetooth has recently been at the forefront of innovation. It is becoming increasingly relevant for vehicles to become aware of their surroundings. Therefore, having knowledge of nearby Bluetooth devices, both inside and outside other vehicles, can provide the listening vehicles with enough data to learn about their environment. In this paper, we collect and analyze a dataset of Bluetooth Classic (BC) and Low Energy (BLE) discoveries. We evaluate their respective characteristics and ability to provide context-aware information from a vehicular perspective. By taking a look at data about the encountered devices, such as GPS location, quantity, quality of signal and device class information, we infer distinctive behaviors between BC and BLE relative to context and application. For this purpose, we propose a set a features to train a classifier for the recognition of different driving environments (i.e. road classes) from Bluetooth discovery data alone. Comparing the performance of our classifier with different sampling parameters, the presented results indicate that, with our feature selection, we are able to predict with reasonable confidence up to three classes (Highway, City, Extra-Urban) by using only discovery data and no geographical information. This outcome gives promising results targeted at low energy and privacy-friendly applications and can open up a wide range of research directions. [less ▲]

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See detailRelay Selection Strategies for SWIPT-Enabled Cooperative Wireless Systems
Gautam, Sumit UL; Lagunas, Eva UL; Sharma, Shree K. et al

in IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Montreal, Canada, Oct. 2017 (2017, October)

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See detailMultiscale model of sintering: diffusion and plastic flow
Kabore, Brice Wendlassida UL; Peters, Bernhard UL

Scientific Conference (2017, September 27)

Impacting particles or static aggregated particles at high temperature may undergo a permanent change of shape modifying the microstructure. Two particles in contact can develop some bonds within sub ... [more ▼]

Impacting particles or static aggregated particles at high temperature may undergo a permanent change of shape modifying the microstructure. Two particles in contact can develop some bonds within sub-second time. This fast sintering force in the particular case of the snow contribute to the rheological behavior and grain rearrangement [1]. Understanding the kinetics of sintering in granular material is of great importance in some engineering applications. For decades, diffusional processes have received more attention in investigations related to the mechanisms behind sintering [2]. Some works have suggested that the plastic flow might be neglected in sintering process for stresses are not high enough to cause dislocation. However, some studies have showed that stresses experienced in fine particles necks can be high enough and even lead to plasticity driven sintering. The importance of each mechanism in the sintering process may lie in the temporal and spatial scale of interest. Increasing importance is being accorded to the role of plastic flow in sintering. however, several investigations have proved that the conventional plasticity theory may fail to predict plastic activity at micro-scale, The objective of this work is to develop adequate computational model that includes instantaneous and time-dependent plastic flow at micro-scale. We aim at extending existing models of sintering and plasticity to cope with multiple spatial and temporal scales simulations using Extended Discrete Element Method. The numerical results are compare to experimental data on snow. [less ▲]

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See detailMaster in Border Studies - ein Praxisbeispiel
Nienaber, Birte UL

Speeches/Talks (2017)

Detailed reference viewed: 7 (0 UL)