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Peer Reviewed
See detailDe toekomst van de historische pedagogiek
Bakker,P.C.M.; Selten,P.J.H; Biesta, Gert UL

in Comenius (1997), 17(3), 195-244

Detailed reference viewed: 13 (0 UL)
See detailDe toekomst van de historische pedagogiek.
Selten, P. J. H.; Bakker, P. C. M.; Biesta, Gert UL

in Comenius (1997), 17(3), 195-199

Detailed reference viewed: 24 (0 UL)
See detailToeplitz operators and TQFT
Schlichenmaier, Martin UL

Scientific Conference (2012, July 18)

Detailed reference viewed: 35 (0 UL)
Peer Reviewed
See detailToeplitz quantization of Kähler manifolds and gl(N), N to infinity, limits
Bordemann, Martin UL; Meinrenken, Eckhard; Schlichenmaier, Martin UL

in Communications in Mathematical Physics (1994), 165

Detailed reference viewed: 22 (2 UL)
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See detailTogether or Alone: The Price of Privacy in Collaborative Learinig
Pejo, Balazs UL; Tang, Qiang; Biczók, Gergely

in Proceedings on Privacy Enhancing Technologies (2019, July)

Machine learning algorithms have reached mainstream status and are widely deployed in many applications. The accuracy of such algorithms depends significantly on the size of the underlying training ... [more ▼]

Machine learning algorithms have reached mainstream status and are widely deployed in many applications. The accuracy of such algorithms depends significantly on the size of the underlying training dataset; in reality a small or medium sized organization often does not have the necessary data to train a reasonably accurate model. For such organizations, a realistic solution is to train their machine learning models based on their joint dataset (which is a union of the individual ones). Unfortunately, privacy concerns prevent them from straightforwardly doing so. While a number of privacy-preserving solutions exist for collaborating organizations to securely aggregate the parameters in the process of training the models, we are not aware of any work that provides a rational framework for the participants to precisely balance the privacy loss and accuracy gain in their collaboration. In this paper, by focusing on a two-player setting, we model the collaborative training process as a two-player game where each player aims to achieve higher accuracy while preserving the privacy of its own dataset. We introduce the notion of Price of Privacy, a novel approach for measuring the impact of privacy protection on the accuracy in the proposed framework. Furthermore, we develop a game-theoretical model for different player types, and then either find or prove the existence of a Nash Equilibrium with regard to the strength of privacy protection for each player. Using recommendation systems as our main use case, we demonstrate how two players can make practical use of the proposed theoretical framework, including setting up the parameters and approximating the non-trivial Nash Equilibrium. [less ▲]

Detailed reference viewed: 68 (3 UL)
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See detailToken Traversal Strategies of a Distributed Spanning Forest Algorithm in Mobile Ad hoc - Delay Tolerant Networks
Piyatumrong, Apivadee UL; Ruiz, Patricia UL; Bouvry, Pascal UL et al

in IAIT (2009)

This paper presents three distributed and decentralized strategies used for token traversal in spanning forest over Mobile Ad Hoc Delay Tolerant Networks. Such networks are characterized by behaviors like ... [more ▼]

This paper presents three distributed and decentralized strategies used for token traversal in spanning forest over Mobile Ad Hoc Delay Tolerant Networks. Such networks are characterized by behaviors like disappearance of mobile devices, connection disruptions, network partitioning, etc. Techniques based on tree topologies are well known for increasing the efficiency of network protocols and/or applications, such as Dynamicity Aware - Graph Relabeling System (DA-GRS). One of the main features of these tree based topologies is the existence of a token traversing in every tree. The use of tokens enables the creation and maintenance of spanning trees in dynamic environments. Subsequently, managing tree-based backbones relies heavily on the token behavior. An efficient and optimal token traversal can highly impact the design of the tree and its usage. In this article, we present a comparison of three distributed and decentralized techniques available for token management, which are Randomness, TABU and Depth First Search. [less ▲]

Detailed reference viewed: 85 (0 UL)
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See detailTolérance aux fautes et reconfiguration dynamique pour les applications distribuées à grande échelle
Besseron, Xavier UL

Doctoral thesis (2010)

This work deals with high performance computing on large scale platforms like computing grids. Computing grids are characterized by (1) frequent changes in execution context and, especially, by (2) a high ... [more ▼]

This work deals with high performance computing on large scale platforms like computing grids. Computing grids are characterized by (1) frequent changes in execution context and, especially, by (2) a high failure probability caused by the large number of components. Running an application efficiently in such an environment requires to consider these parameters. Our research work is based on the abstract representation of the application as a data flow graph from the parallel and distributed programming model Athapascan/Kaapi. This abstract representation is used to provide solutions for (1) dynamic reconfiguration and (2) fault tolerance issues. - First, we propose a dynamic reconfiguration mechanism that manages, transparently for the reconfiguration programmer, concurrent operations on the application state and mutual consistency of states for distributed reconfiguration. - Secondly, we present an original fault tolerance protocol that allows partial rollback of the application in case of failure. For this purpose, the set of strictly required computation tasks to recover is computed. These contributions are evaluated through the Kaapi and X-Kaapi software on the Grid'5000 computing platform. [less ▲]

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See detailTolerant or intolerant character of interacting criteria in aggregation by the Choquet integral
Marichal, Jean-Luc UL

in European Journal of Operational Research (2004), 155(3), 771-791

In many multi-criteria decision-making problems the decision criteria present some interaction whose nature may vary from one situation to another. For example, some criteria may be statistically ... [more ▼]

In many multi-criteria decision-making problems the decision criteria present some interaction whose nature may vary from one situation to another. For example, some criteria may be statistically correlated, thus making them somewhat redundant or opposed. Some others may be somewhat substitutive or complementary depending on the behavior of the decision maker. Some others may be decisive in the sense that the global score (of any alternative) obtained by aggregation is bounded by the partial score along one of them. In this paper we analyze this latter form of interaction. When a criterion bounds the global score from above, it is called a blocker or a veto, due to its rather intolerant character. When it bounds the global score from below, it is then called a pusher or a favor. We thus investigate the tolerance of criteria, or equivalently, the tolerance of the weighted aggregation operator (here the Choquet integral) that is used to aggregate criteria. More specifically, we propose (axiomatically) indices to appraise the extent to which each criterion behaves like a veto or a favor in the aggregation by the Choquet integral. Previous to this, we also propose global tolerance degrees measuring the extent to which the Choquet integral is conjunctive or disjunctive. [less ▲]

Detailed reference viewed: 57 (2 UL)
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See detailTOMASO, A solution in the presence of interacting points of views
Meyer, Patrick; Roubens, Marc; Marichal, Jean-Luc UL

Article for general public (2004)

This short article briefly presents the main features of the multiple criteria sorting tool TOMASO (Technique for Ordinal Multi-Attribute Sorting and Ordering) and its implementation. Its main ... [more ▼]

This short article briefly presents the main features of the multiple criteria sorting tool TOMASO (Technique for Ordinal Multi-Attribute Sorting and Ordering) and its implementation. Its main particularities are the possibility to consider interacting points of view and the use of the Choquet integral as a discriminant function. The capacities are learnt through the use of protoypes, which are well known alternatives for the Decision Maker. [less ▲]

Detailed reference viewed: 32 (1 UL)
See detailTombeaux monumentaux d’Arlon/Orolaunum vicus
Ruppert, Christine UL

in Signa (2018), 7

Detailed reference viewed: 28 (2 UL)
See detailTommaso Padoa-Schioppa [biography]
Chiocchetti, Paolo UL

E-print/Working paper (2017)

Tommaso Padoa-Schioppa (1940-2010) was an Italian banker, economist, and politician. He was one of the "architects of the euro" and helped to push forward the financial, monetary, and economic integration ... [more ▼]

Tommaso Padoa-Schioppa (1940-2010) was an Italian banker, economist, and politician. He was one of the "architects of the euro" and helped to push forward the financial, monetary, and economic integration of Europe. [less ▲]

Detailed reference viewed: 20 (2 UL)
Peer Reviewed
See detailTommaso Stigliani ed il suo involontario contributo al L.E.I
Cicotti, Claudio UL

in Kramer, Johannes; Holtus, Günter; Gleßgen, Martin-Dietrich (Eds.) et al Ex traditione innovatio: miscellanea in honorem Max Pfister septuagenarii oblata, II (2002)

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Peer Reviewed
See detailTomographic characterization of grain-size correlations in polycrystalline Al-Sn
Krill III, C. E.; Döbrich, K. M.; Michels, D. et al

in Developments in X-Ray Tomography III (2002)

Detailed reference viewed: 64 (4 UL)
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See detailTomography with high resolution
Rau, C.; Weitkamp, T.; Snigirev, A. et al

in Developments in X-Ray Tomography III (2002)

Detailed reference viewed: 45 (5 UL)
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Peer Reviewed
See detailTomorrow Never Dies. A Socio-Historical Analysis of the Luxembourgish Curriculum
Lenz, Thomas UL; Rohstock, Anne UL; Schreiber, Catherina UL

in Pinar, Bill (Ed.) International Handbook of Curriculum Research (2013)

Detailed reference viewed: 161 (35 UL)
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See detailThe “Tone Effect” of News on Investor Beliefs: An Experimental Approach
Kräussl, Roman UL; Bosman,, Ronald; Schulze,, William et al

E-print/Working paper (2015)

Detailed reference viewed: 66 (6 UL)
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See detailTongji-Grace02s and Tongji-Grace02k: high-precision static GRACE-only global Earth's gravity field models derived by refined data processing strategies
Qiujie, Chen; Yunzhong, Shen; Francis, Olivier UL et al

in Journal of Geophysical Research. Solid Earth (2018), 123

Abstract In order to derive high-precision static GRACE-only gravity field solutions, the following strategies were implemented in this study: (1) a refined accelerometer calibration model that treats ... [more ▼]

Abstract In order to derive high-precision static GRACE-only gravity field solutions, the following strategies were implemented in this study: (1) a refined accelerometer calibration model that treats monthly accelerometer scales as a 3-order polynomial and daily accelerometer biases as a 5-order polynomial was developed to calibrate accelerometer measurements; (2) the errors of the acceleration and attitude data were estimated together with the geopotential coefficients and accelerometer parameters on the basis of the weighted least-squares adjustments; (3) a nearly complete observation series of GRACE mission was used to decrease the condition number of normal equation; and (4) the GRACE data collected in lower orbit altitude were also included to decrease the condition number. Our results show that: (1) the refined accelerometer calibration model with much less parameters performs as well as previous methods (i.e. solving daily scales and hourly biases or estimating biases along with bias rates every two hours). However, it provides a system of more stable normal equation and less high-frequency noise in gravity field solutions; (2) high-frequency noise in the gravity field solution is reduced by modelling the errors of the acceleration and attitude data; (3) the geopotential coefficients at all degrees is greatly enhanced by using longer GRACE time series (especially the data by the end of 2010); and (4) due to lower orbit altitude, the GRACE data collected since 2014 lead to a significant improvement of the gravity field solution as the satellites are more sensitive to higher-frequency signal. Using the refined strategies, an unconstrained static solution (named Tongji-Grace02s) up to degree and order 180 was derived. For further suppressing the high-frequency noise, a regularization strategy based on the Kaula rule is applied to the degrees and orders beyond 80, leading to a regularized model Tongji-Grace02k. To validate the quality of the derived models, both Tongji-Grace02s and Tongji-Grace02k were compared to the latest GRACE-only models (i.e. GGM05S, ITU\_GRACE16, ITSG-Grace2014s and ITSG-Grace2014k) and validated using independent data (i.e. GNSS/Levelling data and DTU13 oceanic gravity data). Compared to other models, much less spatial noise in terms of global gravity anomalies with respect to the state-of-the-art model EIGEN6C4 and far higher accuracy at high degrees are achieved by Tongji-Grace02s. The same conclusions can be drawn for Tongji-Grace02k when the same analyses were applied to the regularized solutions ITSG-Grace2014k and Tongji-Grace02k. Validations with independent data confirm that Tongji-Grace02s has the least noise among the unconstrained GRACE-only models and Tongji-Grace02k is the one with the best accuracy among the regularized GRACE-only solutions. For the tests up to degree and order 180 using GNSS/Levelling data, the improvements of Tongji-Grace02s with respect to ITSG-Grace2014s reach 13\% over the Canada and 23\% in the Mexico. Even better, no less than 58\% of improvement is achieved by both Tongji-Grace02s relative to ITSG-Grace2014s and Tongji-Grace02k with respect to ITSG-Grace2014k in the validation based on DTU13 data. [less ▲]

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See detailToo good to be cautious: High implicit self-esteem predicts self-reported dangerous mobile phone use
Lannoy, Séverine; Chatard, Armand; Selimbegovic, Leila et al

in Computers in Human Behavior (2020), 103

Mobile phone use and misuse have become a pressing challenge in today's society. Dangerous mobile phone use, such as the use of a mobile phone while driving, is widely practiced, though banned in several ... [more ▼]

Mobile phone use and misuse have become a pressing challenge in today's society. Dangerous mobile phone use, such as the use of a mobile phone while driving, is widely practiced, though banned in several jurisdictions. Research aiming at unfolding the psychological predictors of dangerous mobile phone use have so far been scarce. Especially, researchers have never taken the role of self-esteem into account, which is unfortunate given prior research linking self-esteem to addictive mobile phone use. In the present study, we evaluated the associations between both explicit and implicit self-esteem and dangerous mobile phone use, with a particular focus on phoning while driving. To do so, we assessed implicit self-esteem among 95 participants (89 females) via the Implicit Association Test and explicit self-esteem via a self-reported measure. Problematic mobile phone use and demographic data were assessed with self-reported measures. Implicit self-esteem predicted dangerous mobile phone use, even after we controlled for demographic data and mobile phone dependence. Explicit self-esteem, however, was related to neither dependence nor dangerous use of the mobile phone, thereby supporting the importance of distinguishing between explicit and implicit self-esteem. Our results set the scene for new research avenues regarding mobile phone use while driving. [less ▲]

Detailed reference viewed: 34 (1 UL)
Peer Reviewed
See detailToo Much Unity in the European Union’s External Migration Policy?
Gatti, Mauro UL

E-print/Working paper (2018)

Detailed reference viewed: 33 (3 UL)