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Peer Reviewed
See detailCooperazione giudiziaria, mutuo riconoscimento e circolazione della prova penale nello Spazio giudiziario europeo
Allegrezza, Silvia UL

in Rafaraci, Tommaso (Ed.) L’area di libertà, sicurezza e giustizia: alla ricerca di un equilibrio fra priorità repressive ed esigenze di garanzia (2007)

Detailed reference viewed: 147 (0 UL)
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See detailCoopétition : une piste de réflexion pour les entreprises luxembourgeoises
Geraudel, Mickaël UL

Article for general public (2016)

Detailed reference viewed: 73 (2 UL)
Peer Reviewed
See detailCoopetitive processes of knowledge development within spatial industry
D'Armagnac, Sophie; Geraudel, Mickaël UL; Salvetat, David

Scientific Conference (2010, June)

Detailed reference viewed: 27 (1 UL)
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See detailA Coordinate Descent Framework to Joint Design of MPSK Sequences and Receive Filter Weights in MIMO Radar Systems
Alaee-Kerahroodi, Mohammad UL

in 2019 IEEE Radar Conference (RadarConf) (2019)

In this paper, we aim at a joint design of M-ary Phase Shift Keying (PSK) - or MPSK - transmit waveform and receive space-time filter to maximize the Signal to Interference plus Noise Ratio (SINR) in ... [more ▼]

In this paper, we aim at a joint design of M-ary Phase Shift Keying (PSK) - or MPSK - transmit waveform and receive space-time filter to maximize the Signal to Interference plus Noise Ratio (SINR) in colocated Multiple Input Multiple Output (MIMO) radar systems. The design problem is formulated into a maximization of the SINR, including unimodular discrete phase constraint on the transmit waveforms. The resulting problem is non-convex, whereby we devise an iterative algorithm based on the Coordinate Descent (CD) framework to tackle it iteratively. To reduce the computational complexity in designing the transmit waveforms, we exploit the properties of Fast Fourier Transform (FFT) in this paper. Numerical examples illustrate the superior performance of the proposed algorithm in comparison with the state-of-the-art counterparts. [less ▲]

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See detailA Coordinated Europeanization of the Comics Industry through Distribution: The Politics of the Global Journey of Astérix and Tintin through the Strategic Distribution of their Magazines and Contents in the 1960s
Burton, Jessica UL

in On_Culture: The Open Journal for the Study of Culture (2019), 8(Winter),

Researchers have usually focused on the Tintin and Astérix series’ global book diffusion through translation. However, little has been discussed about the distribution policies of the comics magazine ... [more ▼]

Researchers have usually focused on the Tintin and Astérix series’ global book diffusion through translation. However, little has been discussed about the distribution policies of the comics magazine format, a key factor in the development of European comics. This paper will consider the continentalization of western European national comics industries via the intra-EEC networking of distribution channels during the 1960s. By facilitating the exchange of comics features in the Franco-Belgian area, publishers such as Casterman, Le Lombard, and Dargaud ensured the rise of the industry and of the products they wanted to disseminate. Contemplating the motivations of publishers this article will delve deeper into the emergence of cooperative and competitive distribution channels among national publishers and between countries. Through the archives of Casterman and primary sources this article intends to contribute to a greater understanding of how the carefully planned distribution network of comics influenced the development of the European industry as a whole. [less ▲]

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See detailCoordinated Multicell Multiuser Precoding for Maximizing Weighted Sum Energy Efficiency
He, Shiwen; Huang, Yongming; Yang, Luxi et al

in IEEE Transactions on Signal Processing (2014), 62(3), 741-751

Energy efficiency optimization of wireless systems has become urgently important due to its impact on the global carbon footprint. In this paper we investigate energy efficient multicell multiuser ... [more ▼]

Energy efficiency optimization of wireless systems has become urgently important due to its impact on the global carbon footprint. In this paper we investigate energy efficient multicell multiuser precoding design and consider a new criterion of weighted sum energy efficiency, which is defined as the weighted sum of the energy efficiencies of multiple cells. This objective is more general than the existing methods and can satisfy heterogeneous requirements from different kinds of cells, but it is hard to tackle due to its sum-of-ratio form. In order to address this non-convex problem, the user rate is first formulated as a polynomial optimization problem with the test conditional probabilities to be optimized. Based on that, the sum-of-ratio form of the energy efficient precoding problem is transformed into a parameterized polynomial form optimization problem, by which a solution in closed form is achieved through a two-layer optimization. We also show that the proposed iterative algorithm is guaranteed to converge. Numerical results are finally provided to confirm the effectiveness of our energy efficient beamforming algorithm. It is observed that in the low signal-to-noise ratio (SNR) region, the optimal energy efficiency and the optimal sum rate are simultaneously achieved by our algorithm; while in the middle-high SNR region, a certain performance loss in terms of the sum rate is suffered to guarantee the weighed sum energy efficiency. [less ▲]

Detailed reference viewed: 163 (3 UL)
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See detailCoordinating Principal Component Analyzers
Verbeek, Jakob J.; Vlassis, Nikos UL; Kröse, Ben J. A.

in Proc. Int. Conf. on Artificial Neural Networks, Madrid, Spain, (2002)

Mixtures of Principal Component Analyzers can be used to model high dimensional data that lie on or near a low dimensional manifold. By linearly mapping the PCA subspaces to one global low dimensional ... [more ▼]

Mixtures of Principal Component Analyzers can be used to model high dimensional data that lie on or near a low dimensional manifold. By linearly mapping the PCA subspaces to one global low dimensional space, we obtain a `global' low dimensional coordinate system for the data. As shown by Roweis et al., ensuring consistent global low-dimensional coordinates for the data can be expressed as a penalized likelihood optimization problem. We show that a restricted form of the Mixtures of Probabilistic PCA model allows for a more efficient algorithm. Experimental results are provided to illustrate the viability method. [less ▲]

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See detailCoordination and Organization: Definitions, Examples and Future Research Directions.
Boella, Guido UL; van der Torre, Leon UL

in Electronic Notes in Theoretical Computer Science (2006), 150(3), 320

Coordination languages and models like Linda and Reo have been developed in computer science to coordinate the interaction among components and objects, and are nowadays used to model and analyze ... [more ▼]

Coordination languages and models like Linda and Reo have been developed in computer science to coordinate the interaction among components and objects, and are nowadays used to model and analyze organizations too. Moreover, organizational concepts are used to enrich the existing coordination languages and models. We describe this research area of “organization and coordination” by presenting definitions, examples, and future research directions. We highlight two issues. First, we argue for a study of value-based rather than information-based coordination languages to model the coordination of autonomous agents and organizations. Second, we argue for a study of the balance between enforced control and trust-based anticipation to deal with security aspects in the coordination of organizations. [less ▲]

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See detailCoordination Mechanisms for Floating Content in Realistic Vehicular Scenario
Manzo, Gaetano; Soua, Ridha UL; Di Maio, Antonio UL et al

in Coordination Mechanisms for Floating Content in Realistic Vehicular Scenario (2017)

The increasing interest in vehicular communications draws attention to scalability and network congestion problems and therefore on techniques to offload the traffic, typically carried through the ... [more ▼]

The increasing interest in vehicular communications draws attention to scalability and network congestion problems and therefore on techniques to offload the traffic, typically carried through the infrastructure, to the Vehicle-to-vehicle (V2V) network. Floating content (FC) represents a promising paradigm to share ephemeral content without direct support from infrastructure. It is based on constraining geographically within the Anchor Zone (AZ) the opportunistic replication of a given content among vehicles, in a way that strikes a balance between minimization of resource usage and content availability. Existing works on FC performance modeling are based on standard, homogeneous synthetic mobility models, and it is hence unclear how they actually fit in realistic mobility scenarios. Moreover, the approaches to FC dimensioning they propose assume users have full knowledge of Spatio-temporal mobility patterns, which is hard to achieve in practice. Finally, despite FC is an infrastructure-less communication paradigm, some form of infrastructure support could be available in the vast majority of those application scenarios for which it has been proposed. In this paper, we perform a first attempt at tackling these issues. We focus on how to dimension an Anchor Zone in a realistic vehicular scenario. We propose the first set of simple dimensioning strategies, based on the estimation of some key mobility parameters and of FC performance. We assess such strategies on measurement-based vehicular traces, providing a first indication of their relative performance, and of the feasibility of FC in practical scenarios. [less ▲]

Detailed reference viewed: 140 (11 UL)
See detailCOP 24 and Climate Finance: A Stepping Stone or a Blurred Line?
Alexandraki, Chrysa UL

E-print/Working paper (2019)

In December 2018, the 24th Conference of the Parties (COP 24) to the United Nations Framework Convention on Climate Change (UNFCCC), took place in Katowice, Poland. The main objective of those ... [more ▼]

In December 2018, the 24th Conference of the Parties (COP 24) to the United Nations Framework Convention on Climate Change (UNFCCC), took place in Katowice, Poland. The main objective of those negotiations was to finalize the so called ‘Paris Rulebook’ [the Paris Agreement Work Programme (PAWP)], which would constitute a set of rules to implement and operationalize the Paris Agreement. The issues at stakes varied from mitigation, adaptation and loss and damage, to more technical issues, such as transparency, climate finance and carbon market mechanisms under the Paris Agreement. This post focuses on the progress made on the issue of climate finance based on an analysis of the COP 24 decision on the relevant issues. [less ▲]

Detailed reference viewed: 156 (32 UL)
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See detailCoP Luxembourg
Böwen, Petra UL; Dujardin, Céline UL; Pissinger, Simone

Poster (2016, September 05)

Detailed reference viewed: 118 (12 UL)
See detailCoping and Subjective Well-being in Old Age
Ferring, Dieter UL

in Abstracts of the 9th European Congress of Psychology, Granada (Spain), 3.-7. July 2005. (2005)

Detailed reference viewed: 24 (0 UL)
See detailCoping as a "reality construction": On the role of attentive, comparative, and interpretative processes in coping with cancer
Ferring, Dieter UL; Filipp, S.-H.

in Harvey, J.; Miller, E. (Eds.) Loss and trauma. General and Close Relationship Perspectives (2000)

Detailed reference viewed: 43 (3 UL)
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Peer Reviewed
See detailThe coping of bystanders with cyberbullying in an adolescent population
Steffgen, Georges UL; Pinto Costa, Andreia UL; Slee, Phillip T.

in Slee, Phillip T.; Skrzypiec, Grace; Cefai, Carmel (Eds.) Child and Adolescent Wellbeing and Violence Prevention in Schools (2018)

Cyberbullying is a serious social phenomenon that occurs in different settings. In line with the participant role approach (Salmivalli, 2010), different bystanders (e.g. assistants, reinforcers, defenders ... [more ▼]

Cyberbullying is a serious social phenomenon that occurs in different settings. In line with the participant role approach (Salmivalli, 2010), different bystanders (e.g. assistants, reinforcers, defenders, and outsiders), likewise cyberbullies, and cybervictims are involved in cyberbullying incidents. The current study explores how participants in cyberbullying incidents differ in coping behaviour. Students of German and Luxembourg secondary schools (n = 367) completed a questionnaire, amongst others, on participant roles and coping. Coping behavior was classified into six strategies: other-focused, self-focused, avoidance, relationships improvement, assertive responses, and technical responses (AUTHORS et al, 2012). These coping behaviors were mostly interrelated. Regression analysis showed that avoidance, self-focused strategies, and assertive responses predicted victimization. Additionally, defender behavior was predicted by reduced technical responses and enhanced other focused strategies. Hence, different actors in cyberbullying incidents differ systematically in coping behavior. The implications of the findings are of relevance for the development of efficient coping-based intervention programs against cyberbullying. In particular, avoidance, self- and other-focused strategies of actors in cyberbullying incidents have to be considered in intervention programs. [less ▲]

Detailed reference viewed: 163 (10 UL)
Peer Reviewed
See detailCoping with Bullying questionnaire: Validation of the German adaptation
Pinto Costa, Andreia UL; Steffgen, Georges UL; Skrzypiec, Grace

Poster (2015, May 21)

Detailed reference viewed: 83 (6 UL)