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See detailConstrained bayesian active learning of linear classifier
Tsakmalis, Anestis UL; Chatzinotas, Symeon UL; Ottersten, Björn UL

in 2018 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) (2018)

In this paper, an on-line interactive method is proposed for learning a linear classifier. This problem is studied within the Active Learning (AL) framework where the learning algorithm sequentially ... [more ▼]

In this paper, an on-line interactive method is proposed for learning a linear classifier. This problem is studied within the Active Learning (AL) framework where the learning algorithm sequentially chooses unlabelled training samples and requests their class labels from an oracle in order to learn the classifier with the least queries to the oracle possible. Additionally' a constraint is introduced into this interactive learning process which limits the percentage of the samples from one “unwanted” class under a certain threshold. An optimal AL solution is derived and implemented with a sophisticated, accurate and fast Bayesian Learning method, the Expectation Propagation (EP) and its performance is demonstrated through numerical simulations. [less ▲]

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See detailThe Power of Nuisance. The European Parliament's Gain in Power in the Area of Community Social Policy, 1952-1979
Roos Geb. Herzog, Mechthild UL

Doctoral thesis (2018)

The European Parliament (EP) today has significant powers in the EU legislation process. Yet, it was not intended to be more than a consultative assembly at the founding of the European Communities in the ... [more ▼]

The European Parliament (EP) today has significant powers in the EU legislation process. Yet, it was not intended to be more than a consultative assembly at the founding of the European Communities in the 1950s. This thesis argues that the EP’s gain in power cannot be fully understood without an examination of its first two and a half decades of operation, prior to direct elections. Long before the Parliament was assigned formal powers, Members of the EP (MEPs) succeeded in gaining influence on Community policy-making through a supranational activism driven by ideas of ever closer integration. This thesis demonstrates how the EP swiftly outgrew the role of an ineffectual ‘talking shop’ and developed noteworthy – though mostly informal – parliamentary powers already prior to its first direct elections in 1979. EP activism was facilitated by the growing willingness of the other Community institutions and member state governments to accept the EP’s increasing involvement, and a range of exogenous developments such as crises, providing fertile ground for the MEPs’ endeavour to empower their institution. This thesis demonstrates that the EP’s gain in formal power from the late 1970s and 1980s was the result, not the beginning, of institutionalisation processes within the EP leading to increasing parliamentary influence. This thesis is based on a corpus of ca. 4,000 EP documents from the period 1952-1979 (such as resolutions, reports, parliamentary questions and minutes of debates), and on 25 semi- structured interviews with former MEPs and EP staff members. It analyses through a historical- sociological institutionalist approach the ideational, sociological and institutional factors that induced MEPs – delegates from the national parliaments at the time – to invest considerable time and effort into an institution which promised no significant political impact, no career advancement, and no acknowledgement by voters. This thesis studies the EP’s institutional evolution through the lens of Community social policy – a policy area regarding which Treaty provisions were limited and Community competences very narrow. Even though this area was handled by national governments rather as a byproduct in the establishment of the Common Market, it developed into fertile ground for the MEPs’ ideas-driven activism, and provided the delegates with ample opportunities to develop and institutionalise procedures of parliamentary involvement in Community policy-making. This thesis shows that the European Parliament, prior to its first direct elections, must not be thought of as the institution described in the Communities’ founding Treaties. Instead, whilst largely operating within its Treaty-assigned remit, the pre-1979 EP should rather be considered the sum of the actions of its members. This thesis provides an in-depth study of the institutionalisation processes which resulted from the delegates’ activism, both constrained and enabled by established rules and procedures, and of the endogenous and exogenous factors in the EP’s environment which influenced these institutionalisation processes. This thesis also offers a detailed analysis of the ideas, logics of appropriateness and aspects of socialisation influencing the MEPs’ behaviour in the area of social policy. Even though the shaping of the EP’s powers was obviously not in the hands of MEPs alone, this dissertation reveals that the MEPs’ pursuit of more European integration was the main driving factor behind the EP’s gradual empowerment prior to 1979. [less ▲]

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See detailCache-aided Simultaneous Wireless Information and Power Transfer (SWIPT) with Relay Selection
Gautam, Sumit UL; Vu, Thang Xuan UL; Chatzinotas, Symeon UL et al

in IEEE Journal on Selected Areas In Communications (2018)

In this paper, we investigate the performance of cache-assisted simultaneous wireless information and power transfer (SWIPT) cooperative systems, in which one source communicates with one destination via ... [more ▼]

In this paper, we investigate the performance of cache-assisted simultaneous wireless information and power transfer (SWIPT) cooperative systems, in which one source communicates with one destination via the aid of multiple relays. In order to prolong the relays’ serving time, the relays are assumed to be equipped with a cache memory and energy harvesting (EH) capability. Based on the time-splitting mechanism, we analyze the effect of caching on the system performance in terms of the serving throughput and the stored energy at the relay. In particular, two optimization problems are formulated to maximize the relay-destination throughput and the energy stored at the relay subject to some quality-of-service (QoS) constraints, respectively. By using the KKT conditions and with the help of the Lambert function, closed-form solutions are obtained for the two formulated problems. In order to further improve the performance, a relay selection policy is introduced to select the best relay based on either the maximum throughput between the relays’ and destination link or maximum stored energy at the relay, for conveying information to the destination. Numerical results reveal significant benefits of incorporating caching capabilities to SWIPT systems, in terms of improved serving time, throughput and energy harvesting performance at the relays. [less ▲]

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See detailDie Wissenschaft und ihre Kinder. Zur politischen Epistemologie der Frühpädagogik
Neumann, Sascha UL

in Bloch, Bianca; Cloos, Peter; Koch, Sandra (Eds.) et al Kinder und Kindheiten. Frühpädagogische Perspektiven (2018)

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See detailEnergy-Efficient and Secure Resource Allocation for Multiple-Antenna NOMA with Wireless Power Transfer
Chang, Zheng; Lei, Lei UL; Zhang, Huaqing et al

in IEEE Transactions on Green Communications and Networking (2018)

Detailed reference viewed: 89 (12 UL)
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See detailTowards the Existential Control of Boolean Networks: A Preliminary Report
Paul, Soumya UL; Pang, Jun UL; Su, Cui

in Proceedings of the 4th International Symposium on Dependable Software Engineering. Theories, Tools, and Applications (2018)

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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 detailNuclear localization and phosphorylation modulate pathological effects of Alpha-Synuclein
Pinho, Raquel; Paiva, Isabel; Jerčić, Kristina Gotovac et al

in Human Molecular Genetics (2018)

Detailed reference viewed: 75 (8 UL)
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See detailFormal Analysis of Vote Privacy Using Computationally Complete Symbolic Attacker
Bana, Gergely UL; Chadha, Rohit; Eeralla, Ajay

in Computer Security (2018)

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See detailSecurity Analysis of Key Acquiring Strategies Used by Cryptographic Ransomware
Genç, Ziya Alper UL; Lenzini, Gabriele UL; Ryan, Peter UL

in Advances in Cybersecurity 2018 (2018)

To achieve its goals, ransomware needs to employ strong encryption, which in turn requires access to high-grade encryption keys. Over the evolution of ransomware, various techniques have been observed to ... [more ▼]

To achieve its goals, ransomware needs to employ strong encryption, which in turn requires access to high-grade encryption keys. Over the evolution of ransomware, various techniques have been observed to accomplish the latter. Understanding the advantages and disadvantages of each method is essential to develop robust defense strategies. In this paper we explain the techniques used by ransomware to derive encryption keys and analyze the security of each approach. We argue that recovery of data might be possible if the ransomware cannot access high entropy randomness sources. As an evidence to support our theoretical results, we provide a decryptor program for a previously undefeated ransomware. [less ▲]

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See detailExpressionistische Lyrik als Kulturpolitik
Dembeck, Till UL

in Lubkoll, Christine; Illi, Manuel; Hampel, Anna (Eds.) Politische Literatur. Begriffe – Debatten – Aktualität (2018)

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See detailDas Motiv des Weinens in der deutschen Literatur des Mittelalters. Aspekte eines irritierenden interkulturellen Phänomens
Sieburg, Heinz UL

in Wiegmann, Eva (Ed.) Diachrone Interkulturalität (2018)

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See detailBalancing validity, utility and public health considerations in disorders due to addictive behaviours.
Stein, Dan J.; Billieux, Joël UL; Bowden-Jones, Henrietta et al

in World psychiatry : official journal of the World Psychiatric Association (WPA) (2018), 17(3), 363-364

Detailed reference viewed: 49 (1 UL)
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See detailKleines Land, große Herausforderungen: Anmerkungen zu Architektur und Urbanismus in Luxemburg
Hesse, Markus UL

in Flagge, Ingeborg (Ed.) Witry & Witry - Über das Wohnen (2018)

Der Beitrag enthält eine Reflexion über die Praxis von Architektur, Stadtplanung und Urbanismus im Großherzogtum Luxemburg. Insofern stellt er eine Rahmung für die in dem Band präsentierte Werkschau des ... [more ▼]

Der Beitrag enthält eine Reflexion über die Praxis von Architektur, Stadtplanung und Urbanismus im Großherzogtum Luxemburg. Insofern stellt er eine Rahmung für die in dem Band präsentierte Werkschau des Büros Witry & Witry in Echternach, Luxemburg, dar. Es geht um die Spezifika der sozioökonomischen Entwicklung des Landes und ihrer Implikationen für die baulich-räumliche Entwicklung, die ohne Berücksichtigung Ersterer nicht angemessen nachzuvollziehen ist. Entsprechendes gilt für die Positionierung planerischer Interventionen, oder für die Beurteilung der Passfähigkeit von Innovationen wie Partizipation der Öffentlichkeit. [less ▲]

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See detailWeak Iron Oxidation by Sulfobacillus thermosulfidooxidans Maintains a Favorable Redox Potential for Chalcopyrite Bioleaching
Christel, Stephan; Herold, Malte UL; Bellenberg, Sören et al

in Frontiers in Microbiology (2018), 9(December), 1-12

Bioleaching is an emerging technology, describing the microbially assisted dissolution of sulfidic ores that provides a more environmentally friendly alternative to many traditional metal extraction ... [more ▼]

Bioleaching is an emerging technology, describing the microbially assisted dissolution of sulfidic ores that provides a more environmentally friendly alternative to many traditional metal extraction methods, such as roasting or smelting. Industrial interest is steadily increasing and today, circa 15–20% of the world’s copper production can be traced back to this method. However, bioleaching of the world’s most abundant copper mineral chalcopyrite suffers from low dissolution rates, often attributed to passivating layers, which need to be overcome to use this technology to its full potential. To prevent these passivating layers from forming, leaching needs to occur at a low oxidation/reduction potential (ORP), but chemical redox control in bioleaching heaps is difficult and costly. As an alternative, selected weak iron-oxidizers could be employed that are incapable of scavenging exceedingly low concentrations of iron and therefore, raise the ORP just above the onset of bioleaching, but not high enough to allow for the occurrence of passivation. In this study, we report that microbial iron oxidation by Sulfobacillus thermosulfidooxidans meets these specifications. Chalcopyrite concentrate bioleaching experiments with S. thermosulfidooxidans as the sole iron oxidizer exhibited significantly lower redox potentials and higher release of copper compared to communities containing the strong iron oxidizer Leptospirillum ferriphilum. Transcriptomic response to single and co-culture of these two iron oxidizers was studied and revealed a greatly decreased number of mRNA transcripts ascribed to iron oxidation in S. thermosulfidooxidans when cultured in the presence of L. ferriphilum. This allowed for the identification of genes potentially responsible for S. thermosulfidooxidans’ weaker iron oxidation to be studied in the future, as well as underlined the need for new mechanisms to control the microbial population in bioleaching heaps. [less ▲]

Detailed reference viewed: 53 (7 UL)
See detailParcours éducatifs, multilinguisme et perspectives. Le deuxième rapport national sur l'éducation.
Lenz, Thomas UL; Baumann, Isabell UL; Ugen, Sonja UL et al

in LUCET; SCRIPT (Eds.) Rapport National sur L'Éducation au Luxembourg 2018 (2018)

Detailed reference viewed: 32 (9 UL)
See detailBildungsverläufe, Mehrsprachigkeit und ein Ausblick auf die Zukunft. Der zweite Bildungsbericht für Luxemburg.
Lenz, Thomas UL; Baumann, Isabell UL; Ugen, Sonja UL et al

in Lucet; Script (Eds.) Nationaler Bildungsbericht Luxembourg 2018 (2018)

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See detailProp of ribbon hypergraphs and strongly homotopy involutive Lie bialgebras
Merkulov, Sergei UL

E-print/Working paper (2018)

For any integer d we introduce a prop RHrad of d-oriented ribbon hypergraphs (in which "edges" can connect more than two vertices) and prove that there exists a canonical morphism Holieb⋄d⟶RHrad from the ... [more ▼]

For any integer d we introduce a prop RHrad of d-oriented ribbon hypergraphs (in which "edges" can connect more than two vertices) and prove that there exists a canonical morphism Holieb⋄d⟶RHrad from the minimal resolution Holieb⋄d of the (degree shifted) prop of involutive Lie bialgebras into the prop of ribbon hypergraphs which is non-trivial on each generator of Holieb⋄d. As an application we show that for any graded vector space W equipped with a family of cyclically (skew)symmetric higher products the associated vector space of cyclic words in elements of W has a combinatorial Holieb⋄d-structure. As an illustration we construct for each natural number N≥1 an explicit combinatorial strongly homotopy involutive Lie bialgebra structure on the vector space of cyclic words in N graded letters which extends the well-known Schedler's necklace Lie bialgebra structure from the formality theory of the Goldman-Turaev Lie bialgebra in genus zero. [less ▲]

Detailed reference viewed: 60 (0 UL)