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See detailAcademic Perspectives from Germany
Hu, Adelheid UL

in Byram, Michael; Parmenter, Lynne (Eds.) The Common European Framework of Reference: The Globalisation of Language Education Policy (2012)

Detailed reference viewed: 135 (12 UL)
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See detailAcademic self-concept and achievement goals: Do their reciprocal effects differ for over- and underachievers?
Preckel, Franzis; Niepel, Christoph UL

Scientific Conference (2012, April)

Detailed reference viewed: 41 (1 UL)
See detailAcademic writing across languages: multilingual and contrastive approaches in higher education
Huemer, Birgit UL; Lejot, Eve UL; Deroey, Katrien UL

Book published by Böhlau (2019)

This book explores how academic writing varies across languages in order to enrich concepts for teaching academic writing in multilingual environments. The contributions focus on teaching approaches ... [more ▼]

This book explores how academic writing varies across languages in order to enrich concepts for teaching academic writing in multilingual environments. The contributions focus on teaching approaches, linguistic features and writing practices in multilingual contexts. It aims to discuss how these findings could be applied in order to develop multilingual approaches for teaching academic writing at the university. [less ▲]

Detailed reference viewed: 291 (35 UL)
See detailAcademics say the art market bubble is about to burst
Lehnert, Thorsten UL; Kräussl, Roman UL

in Artnet News (2016)

Detailed reference viewed: 16 (3 UL)
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See detail«L'académie de Jean Le Gac»
Roelens, Nathalie UL

in Jean Le Gac (2002)

Detailed reference viewed: 26 (1 UL)
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See detailAccelerated EM-based clustering of large data sets
Verbeek, Jakob J.; Nunnink, Jan R. J.; Vlassis, Nikos UL

in Data Mining & Knowledge Discovery (2006), 13(3), 291-307

Motivated by the poor performance (linear complexity) of the EM algorithm in clustering large data sets, and inspired by the successful accelerated versions of related algorithms like k-means, we derive ... [more ▼]

Motivated by the poor performance (linear complexity) of the EM algorithm in clustering large data sets, and inspired by the successful accelerated versions of related algorithms like k-means, we derive an accelerated variant of the EM algorithm for Gaussian mixtures that: (1) offers speedups that are at least linear in the number of data points, (2) ensures convergence by strictly increasing a lower bound on the data log-likelihood in each learning step, and (3) allows ample freedom in the design of other accelerated variants. We also derive a similar accelerated algorithm for greedy mixture learning, where very satisfactory results are obtained. The core idea is to define a lower bound on the data log-likelihood based on a grouping of data points. The bound is maximized by computing in turn (i) optimal assignments of groups of data points to the mixture components, and (ii) optimal re-estimation of the model parameters based on average sufficient statistics computed over groups of data points. The proposed method naturally generalizes to mixtures of other members of the exponential family. Experimental results show the potential of the proposed method over other state-of-the-art acceleration techniques. [less ▲]

Detailed reference viewed: 79 (0 UL)
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See detailAccelerated microRNA-Precursor Detection Using the Smith-Waterman Algorithm on FPGAs
May, Patrick UL; Klau, Gunnar W.; Bauer, Markus et al

in Dubitzky, Werner; Schuster, Assaf; Sloot, Peterm A. (Eds.) et al Distributed, High-Performance and Grid Computing in Computational Biology (2007)

During the last few years more and more functionalities of RNA have been discovered that were previously thought of being carried out by proteins alone. One of the most striking discoveries was the ... [more ▼]

During the last few years more and more functionalities of RNA have been discovered that were previously thought of being carried out by proteins alone. One of the most striking discoveries was the detection of microRNAs, a class of noncoding RNAs that play an important role in post-transcriptional gene regulation. Large-scale analyses are needed for the still increasingly growing amount of sequence data derived from new experimental technologies. In this paper we present a framework for the detection of the distinctive precursor structure of microRNAS that is based on the well-known Smith-Waterman algorithm. By conducting the computation of the local alignment on a FPGA, we are able to gain a substantial speedup compared to a pure software implementation bringing together supercomputer performance and bioinformatics research. We conducted experiments on real genomic data and we found several new putative hits for microRNA precursor structures. [less ▲]

Detailed reference viewed: 114 (5 UL)
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See detailAccelerated variational dirichlet process mixtures
Kurihara, Kenichi; Welling, Max; Vlassis, Nikos UL

in Advances in Neural Information Processing Systems 19 (2007)

Dirichlet Process (DP) mixture models are promising candidates for clustering applications where the number of clusters is unknown a priori. Due to computational considerations these models are ... [more ▼]

Dirichlet Process (DP) mixture models are promising candidates for clustering applications where the number of clusters is unknown a priori. Due to computational considerations these models are unfortunately unsuitable for large scale data-mining applications. We propose a class of deterministic accelerated DP mixture models that can routinely handle millions of data-cases. The speedup is achieved by incorporating kd-trees into a variational Bayesian algorithm for DP mixtures in the stick-breaking representation, similar to that of Blei and Jordan (2005). Our algorithm differs in the use of kd-trees and in the way we handle truncation: we only assume that the variational distributions are fixed at their priors after a certain level. Experiments show that speedups relative to the standard variational algorithm can be significant. [less ▲]

Detailed reference viewed: 270 (0 UL)
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See detailAccelerating Monte Carlo estimation with derivatives of high-level finite element models
Hauseux, Paul UL; Hale, Jack UL; Bordas, Stéphane UL

in Computer Methods in Applied Mechanics & Engineering (2017), 318

In this paper we demonstrate the ability of a derivative-driven Monte Carlo estimator to accelerate the propagation of uncertainty through two high-level non-linear finite element models. The use of ... [more ▼]

In this paper we demonstrate the ability of a derivative-driven Monte Carlo estimator to accelerate the propagation of uncertainty through two high-level non-linear finite element models. The use of derivative information amounts to a correction to the standard Monte Carlo estimation procedure that reduces the variance under certain conditions. We express the finite element models in variational form using the high-level Unified Form Language (UFL). We derive the tangent linear model automatically from this high-level description and use it to efficiently calculate the required derivative information. To study the effectiveness of the derivative-driven method we consider two stochastic PDEs; a one- dimensional Burgers equation with stochastic viscosity and a three-dimensional geometrically non-linear Mooney-Rivlin hyperelastic equation with stochastic density and volumetric material parameter. Our results show that for these problems the first-order derivative-driven Monte Carlo method is around one order of magnitude faster than the standard Monte Carlo method and at the cost of only one extra tangent linear solution per estimation problem. We find similar trends when comparing with a modern non-intrusive multi-level polynomial chaos expansion method. We parallelise the task of the repeated forward model evaluations across a cluster using the ipyparallel and mpi4py software tools. A complete working example showing the solution of the stochastic viscous Burgers equation is included as supplementary material. [less ▲]

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See detailAccelerating short transfers in 802.11 networks
Arcia-Moret, Andres; Montavont, Nicolas; Castignani, German UL

Poster (2013, November 14)

The legacy bandwidth discovery phase of TCP spends an unnecessary number of RTTs for reaching the fair share of the network. In this article we introduce a simple modification at the receiver that splits ... [more ▼]

The legacy bandwidth discovery phase of TCP spends an unnecessary number of RTTs for reaching the fair share of the network. In this article we introduce a simple modification at the receiver that splits the TCP ACKs in a controlled manner. This mechanism allows to fast ramp-up the TCP congestion window. Our experiments performed in a real testbed show benefits not only in the increased data throughput but also in a non-congested uplink (Acknowledgement) path in an 802.11 access. [less ▲]

Detailed reference viewed: 89 (2 UL)
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See detailAccelerating the DC algorithm for smooth functions
Aragón Artacho, Francisco Javier UL; Fleming, Ronan MT UL; Phan, Vuong UL

E-print/Working paper (2015)

We introduce two new algorithms to minimise smooth difference of convex (DC) functions that accelerate the convergence of the classical DC algorithm (DCA). We prove that the point computed by DCA can be ... [more ▼]

We introduce two new algorithms to minimise smooth difference of convex (DC) functions that accelerate the convergence of the classical DC algorithm (DCA). We prove that the point computed by DCA can be used to define a descent direction for the objective function evaluated at this point. Our algorithms are based on a combination of DCA together with a line search step that uses this descent direction. Convergence of the algorithms is proved and the rate of convergence is analysed under the Łojasiewicz property of the objective function. We apply our algorithms to a class of smooth DC programs arising in the study of biochemical reaction networks, where the objective function is real analytic and thus satisfies the Łojasiewicz property. Numerical tests on various biochemical models clearly show that our algorithms outperforms DCA, being on average more than four times faster in both computational time and the number of iterations. The algorithms are globally convergent to a non-equilibrium steady state of a biochemical network, with only chemically consistent restrictions on the network topology. [less ▲]

Detailed reference viewed: 151 (16 UL)
See detailAccélération et voyage temporel dans la littérature et la BD
Freyermuth, Sylvie UL

Presentation (2013, July 09)

Detailed reference viewed: 51 (2 UL)
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See detailAcceptability and Acceptance of Autonomous Mobility on Demand: The Impact of an Immersive Experience
Distler, Verena UL; Lallemand, Carine UL; Thierry, Bellet

in Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems (2018, April)

Autonomous vehicles have the potential to fundamentally change existing transportation systems. Beyond legal concerns, these societal evolutions will critically depend on user acceptance. As an emerging ... [more ▼]

Autonomous vehicles have the potential to fundamentally change existing transportation systems. Beyond legal concerns, these societal evolutions will critically depend on user acceptance. As an emerging mode of public transportation [7], Autonomous mobility on demand (AMoD) is of particular interest in this context. The aim of the present study is to identify the main components of acceptability (before first use) and acceptance (after first use) of AMoD, following a user experience (UX) framework. To address this goal, we conducted three workshops (N=14) involving open discussions and a ride in an experimental autonomous shuttle. Using a mixed-methods approach, we measured pre-immersion acceptability before immersing the participants in an on-demand transport scenario, and eventually measured post-immersion acceptance of AMoD. Results show that participants were reassured about safety concerns, however they perceived the AMoD experience as ineffective. Our findings highlight key factors to be taken into account when designing AMoD experiences. [less ▲]

Detailed reference viewed: 80 (13 UL)
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See detailAcceptability in food of NaCl/KCl mixture.
Neyses, Ludwig UL; Groth, H.; Vetter, W.

in Lancet (1983), 2(8364), 1427-8

Detailed reference viewed: 76 (0 UL)
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See detailAccès aux connaissances pour une PME dans un pôle de compétitivité : un dirigeant extraverti en vaut deux
Geraudel, Mickaël UL

in Gestion 2000 (2010), 5

Plusieurs recherches montrent la surperformance des entreprises situées dans les districts relativement aux entreprises situées en dehors de ces territoires. Cette surperformance est essentiellement ... [more ▼]

Plusieurs recherches montrent la surperformance des entreprises situées dans les districts relativement aux entreprises situées en dehors de ces territoires. Cette surperformance est essentiellement expliquée par les logiques de réseaux développées à l’intérieur des districts et les effets de synergie opérés entre les membres de ces réseaux (Becattini, 1992). Cette réalité économique a favorisé, au début des années 2000, le développement de nouvelles formes de districts : les pôles de compétitivité. L’objectif affiché par le gouvernement français fut de redynamiser le tissu économique français dans une perspective d’innovation sur des territoires régionaux plus ou moins performants. [less ▲]

Detailed reference viewed: 21 (0 UL)
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See detailL’accès du public aux documents des institutions européennes: le développement d’un droit et sa mise en application (1973-2004)
Bagias, Andreas UL

Doctoral thesis (2011)

Access to official documents is a key outcome of the concept of transparency as applied to the institutions of the European Union. In the 1990s, transparency offered the promise of a cure to the ... [more ▼]

Access to official documents is a key outcome of the concept of transparency as applied to the institutions of the European Union. In the 1990s, transparency offered the promise of a cure to the “democratic deficit” from which these European institutions suffered. Key factors that underpinned progress towards greater transparency and the right of access to documents are identified as: the influence of globalization and the gradual adoption of national legislations of the various member states, the “Citizens Europe” movement, the legal evolution concerning access to environmental information, the institutional evolution of the European decision-making process, the difficulties encountered during the ratification of the Maastricht Treaty and, the accession of Sweden and Finland in 1995 to the European Union. These developments culminated with the insertion of article 255 to the Amsterdam Treaty and, under the 2001 presidency of Sweden, the adoption of Regulation (EC) No 1049/2001. Official statistics reveal, however, that the right of access to documents, produced and received by the European institutions, is rarely applied by European citizens. This right, like a working knowledge of the functioning of the European Union, remains the preserve of a small circle of professionals, usually established in Brussels. It seems that transparency and the right of access to documents does not bring the citizen closer to the European institutions and it does not solve the stated “democratic deficit”. Rather, this research finds that it has been used as an instrument in an institutional struggle to limit the power of the Council and the Commission. [less ▲]

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See detailAccess Control Enforcement Testing
El Kateb, Donia UL; Elrakaiby, Yehia; Mouelhi, Tejeddine UL et al

in 8th International Workshop on Automation of Software Test (AST), 2013 (2012, May)

A policy-based access control architecture com- prises Policy Enforcement Points (PEPs), which are modules that intercept subjects access requests and enforce the access decision reached by a Policy ... [more ▼]

A policy-based access control architecture com- prises Policy Enforcement Points (PEPs), which are modules that intercept subjects access requests and enforce the access decision reached by a Policy Decision Point (PDP), the module implementing the access decision logic. In applications, PEPs are generally implemented manually, which can introduce errors in policy enforcement and lead to security vulnerabilities. In this paper, we propose an approach to systematically test and validate the correct enforcement of access control policies in a given target application. More specifically, we rely on a two folded approach where a static analysis of the target application is first made to identify the sensitive accesses that could be regulated by the policy. The dynamic analysis of the application is then conducted using mutation to verify for every sensitive access whether the policy is correctly enforced. The dynamic analysis of the application also gives the exact location of the PEP to enable fixing enforcement errors detected by the analysis. The approach has been validated using a case study implementing an access control policy. [less ▲]

Detailed reference viewed: 123 (7 UL)