References of "Scientific congresses, symposiums and conference proceedings"
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See detailMulti-electron dynamics for neutralization of highly charged ions near surfaces
Burgdorfer, J.; Wirtz, Ludger UL; Reinhold, C. O. et al

in Vacuum (2004), 73(1), 3-7

We present a simulation of the neutralization of highly charged ions in front of a lithium fluoride surface including the close-collision regime above the surface. The present approach employs a Monte ... [more ▼]

We present a simulation of the neutralization of highly charged ions in front of a lithium fluoride surface including the close-collision regime above the surface. The present approach employs a Monte-Carlo solution of the Liouville master equation for the joint probability density of the ionic motion and the electronic population of the projectile and the target surface. It includes single as well as double particle-hole (de)excitation processes and incorporates electron correlation effects through the conditional dynamics of population strings. For slow projectiles and normal incidence, the ionic motion depends sensitively on the interplay between image acceleration towards the surface and repulsion by an ensemble of positive hole charges in the surface ("trampoline effect"). For Ne10+ we find that image acceleration is dominant and no collective backscattering high above the surface takes place. (C) 2004 Elsevier Ltd. All rights reserved. [less ▲]

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See detailAn incremental neural-based method to discover temporal skeletons in transactional data streams
Schommer, Christoph UL

in Abstract book of 5th Recent Advances in Soft Computing (RASC 2004) (2004)

Detailed reference viewed: 25 (1 UL)
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See detailA methodology for pattern discovery in tennis rallys using the adaptive framework ANIMA
Schroeder, Ben UL; Hansen, Frank; Schommer, Christoph UL

in Workshop Knowledge Discovery in Data Streams. ECML/PKDD 2005 (2004)

Detailed reference viewed: 91 (0 UL)
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See detailAn SQL-like interface to retrieve associative patterns from neural skeletons
Schommer, Christoph UL

in Proceedings 2004 International Conference on Advances in Intelligent Systems - Theory and Applications (2004)

Detailed reference viewed: 39 (1 UL)
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See detailAn optimization of terahertz local oscillators based on LT-GaAs technology
Mayorga, I. C.; Mikulics, M.; Schmitz, A. et al

in SPIE - The International Society for Optical Engineering (2004), 5498 (2004)

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See detailLarge-area traveling-wave LT-GaAs photomixers for LO application
Michael, E. A.; Mikulics, M.; Marso, Michel UL et al

in SPIE - The International Society for Optical Engineering (2004), 5498 (2004)

Detailed reference viewed: 63 (0 UL)
See detailDie Rolle der Landwirtschaft in der Eigenständigen Regionalentwicklung der Region "West" Irlands"
Sprenger, Birte UL

in Bröckling, Frank; Grabski-Kieron, Ulrike; Krajewski, Christian (Eds.) Stand und Perspektiven der deutschsprachigen Geographie des ländlichen Raumes (2004)

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See detailConcept and Status of the ECGN Project
Ihde, J.; Baker, T. F.; Bruyninx, C. et al

in Torres, João Agria; Hornik, Helmut (Eds.) EUREF Publication No. 13 (2004)

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See detailFabrication and performance of hybrid photoconductive devices based on freestanding LT-GaAs, Ultrafast Phenomena in Semiconductors and Nanostructure Materials VIII,
Adam, R.; Mikulics, M.; Wu, S. et al

in Proceedings of SPIE (2004), 5353 (2004)

We report on fabrication and high-frequency performance of our photodetectors and photomixers based on freestanding low-temperature-grown GaAs (LT-GaAs). In our experiments, the LT-GaAs/AlAs bilayers were ... [more ▼]

We report on fabrication and high-frequency performance of our photodetectors and photomixers based on freestanding low-temperature-grown GaAs (LT-GaAs). In our experiments, the LT-GaAs/AlAs bilayers were grown on 2-inch diameter, semi-insulating GaAs wafers by a molecular beam epitaxy. Next, the bilayer was patterned to form 10 × 10 μm2 to 150 × 150 μm2 structures using photolithography and ion beam etching. The AlAs layer was then selectively etched in diluted HF solution, and the LT-GaAs device was lifted from its substrate and transferred on top of a variety of substrates including Si, MgO/YBaCuO, Al2O3, and a plastic foil. Following the transfer, metallic coplanar transmission lines were fabricated on top of the LT-GaAs structure, forming a metal semiconductor-metal photodetectors or photomixer structures. Our freestanding devices exhibited above 200 V breakdown voltages and dark currents at 100 V below 3×10-7 A. Device photoresponse was measured using an electro-optic sampling technique with 100-fs-wide laser pulses at wavelengths of 810 nm and 405 nm as the excitation source. For 810-nm excitation, we measured 0.55 ps-wide electrical transients with voltage amplitudes of up to 1.3 V. The signal amplitude was a linear function of the applied voltage bias, as well as a linear function of the laser excitation power, below well-defined saturation thresholds. Output power from the freestanding photomixers was measured with two beam laser illumination experimental setup. Reported fabrication technique is suitable for the LT-GaAs integration with a range of semiconducting, superconducting, and organic materials for high-frequency hybrid optoelectronic applications. [less ▲]

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See detailGaN Nanocolumns on Si(111) Grown b Molecular Beam Epitaxy
Calarco, Raffaella; Marso, Michel UL; Meijers, R. et al

in Proc. 5th Intern. Conf. Advanced Semicon. Dev. & Microsystems ASDAM’04 (2004)

GaN nanocolumns are reproducibly grown by plasma-assisted molecular beam epitaxy on Si(111). The nanocolumn density and diameter, 20–150 nm, are controlled by means of the III/V ratio. The nanocolumns ... [more ▼]

GaN nanocolumns are reproducibly grown by plasma-assisted molecular beam epitaxy on Si(111). The nanocolumn density and diameter, 20–150 nm, are controlled by means of the III/V ratio. The nanocolumns grow parallel to the [111] direction of the Si substrate. The columns have been transferred to a Si(100) substrate covered with a layer of 300nm SiO2; single nanowire devices have been fabricated using finger shaped electrical contacts (Ti/Au) obtained by e-beam patterning technique. The electrical transport properties of the resulting metal–semiconductor–metal nanostructures are analyzed by means of current– voltage measurements with and without UV-illumination. [less ▲]

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See detailMSM varactor diodes based on AlGaN/GaN/SiC HEMT layer structures
Marso, Michel UL; Bernát, J.; Javorka, P. et al

in Proc. 5th Intern. Conf. Advanced Semicon. Dev. & Microsystems ASDAM’04 (2004)

The influence of a carrier supply layer on the electrical properties of MSM diodes based on AlGaN/GaN HEMT layer structures is investigated. The voltage dependence of the Schottky contact capacitance ... [more ▼]

The influence of a carrier supply layer on the electrical properties of MSM diodes based on AlGaN/GaN HEMT layer structures is investigated. The voltage dependence of the Schottky contact capacitance allows the use of the device as varactor diode with CMAX / CMIN ratios up to 17, tuneable by contact geometry. The carrier supply doping determines the sheet carrier density of the twodimensional electron gas channel, which is responsible for the transition voltage and the series resistance of the MSM diode. A device based on the highest doped layer structure shows a cutoff frequency as high as 65 GHz. [less ▲]

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See detailGeneration of 1 THz radiation by photomixing in low-temperature-grown MBE GaAs
Mikulics, M.; Camara, I.; Marso, Michel UL et al

in Proc. 5th Intern. Conf. Advanced Semicon. Dev. & Microsystems ASDAM’04 (2004)

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See detailInfluence of doping density on small and large signal characteristics of AlGaN/GaN/SiC HEMTs
Fox, A.; Marso, Michel UL; Bernát, J. et al

in Proc. 5th Intern. Conf. Advanced Semicon. Dev. & Microsystems ASDAM’04 (2004)

The small signal S-parameter and load pull measurements on AlGaN/GaN HEMTs with different doping densities are reported. The cut-off frequencies ft and fmax of 38 and 67 GHz respectively, and the maximal ... [more ▼]

The small signal S-parameter and load pull measurements on AlGaN/GaN HEMTs with different doping densities are reported. The cut-off frequencies ft and fmax of 38 and 67 GHz respectively, and the maximal output powers of 4.9 and 3.8 W/mm at 2 and 7 GHz respectively, were achieved. The parameter extraction from small signal S-parameters shows an increase of gate-source capacitance and transconductance with the doping concentration and hence its influence on small signal (ft and fmax) and power performance. [less ▲]

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See detailAnytime Algorithms for Multiagent Decision Making Using Coordination Graphs
Vlassis, Nikos UL; Elhorst, R.; Kok, J. R.

in Proceedings of the International Conference on Systems, Man and Cybernetics (2004)

Coordinationgraphsprovideatractableframe- work for cooperative multiagent decision making by decom- posing the global payoff function into a sum of local terms. In this paper we review some distributed ... [more ▼]

Coordinationgraphsprovideatractableframe- work for cooperative multiagent decision making by decom- posing the global payoff function into a sum of local terms. In this paper we review some distributed algorithms for ac- tion selection in a coordination graph and discuss their pros and cons. For real-time decision making we emphasize the need for anytime algorithms for action selection: these are algorithms that improve the quality of the solution over time. We describe variable elimination, coordinate ascent, and the max-plus algorithm, the latter being an instance of the be- lief propagation algorithm in Bayesian networks. We discuss some interesting open problems related to the use of the max- plus algorithm in real-time multiagent decision making. [less ▲]

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See detailVertical Double-Gate MOSFETs
Moers, J.; Trellenkamp, St; Marso, Michel UL et al

in Proc. 5th Intern. Conf. Advanced Semicon. Dev. & Microsystems ASDAM’04 (2004)

Detailed reference viewed: 56 (0 UL)
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See detailIncremental Discovery of Association Rules with Dynamic Neural Cells
Schommer, Christoph UL

in Workshop on Symbolic Networks. ECAI 2004 (2004)

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See detailA point-based POMDP algorithm for robot planning
Spaan, Matthijs T. J.; Vlassis, Nikos UL

in Proc. IEEE Int. Conf. on Robotics and Automation, New Orleans, Louisiana (2004)

We present an approximate POMDP solution method for robot planning in partially observable environments. Our algorithm belongs to the family of point-based value iteration solution techniques for POMDPs ... [more ▼]

We present an approximate POMDP solution method for robot planning in partially observable environments. Our algorithm belongs to the family of point-based value iteration solution techniques for POMDPs, in which planning is performed only on a sampled set of reachable belief points. We describe a simple, randomized procedure that performs value update steps that strictly improve the value of all belief points in each step. We demonstrate our algorithm on a robotic delivery task in an office environment and on several benchmark problems, for which we compute solutions that are very competitive to those of state-ofthe -art methods in terms of speed and solution quality. [less ▲]

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See detailComparison of methods for generating quality of live items: individual interviews versus focus groups
Baumann, Michèle UL; Rat, AC.

in European Society of Health and Medical Sociology (2004)

Works centered on the search for a quality of life (QoL) definition have mostly privileged the individual interviews. No methodology has compared yet the quantitative production of items resulting from ... [more ▼]

Works centered on the search for a quality of life (QoL) definition have mostly privileged the individual interviews. No methodology has compared yet the quantitative production of items resulting from individual interviews with those from focus groups, concerning a lower limbs osteo-arthritis QoL. Purpose: To compare methods of item generation for methods : 2 individual interviews and 2 focus groups and to identify the pertinence of a theoretical construit of QoL. Methods: All methods compared relied on extraction of verbatim collected during tape recorded interviews, transcripted and analysed by 3 teams of health psychologists and sociologists independently. The 4 methods compared were interviewed with interview guide with OA patients in 1) focus group, 2) individual semi-structured interview and 3) using a cognitive interview technique to enhance memories. Using the final scale as a gold standard, the sensitivity and specificity, i.e. the contribution of each method to the scale, were estimated. Results: 66 individual and focus interviews were conducted with 96 OA patients. After exclusion of speeches not related to QoL (i.e. satisfaction, coping, locus of control), 80 items were identified relevant. With patients, focus group produced 74% of the items, while both individual methods contributed 100% of resulting items and none item except subject. Focus group methods contributed some themes but individuals gave more in depth information. Traditional semi-structured interviews contributed to known QoL themes and to items on the feeling of being embarrassed for people to be seen, to ask for help and to annoy close relatives, while cognitive interviews provided more fine tuned items on exchanges with and perception by others about their condition, as well as perspective in life and fears from future dependency. Conclusion. The selected method is relevant to explore the theoretical construit of QoL. One can recommend to use patients’ semi-structured interviews with a traditional or a cognitive technique, conducted by interviewers preferably non-specialist of the condition explored. Perspectives. The question is then what is the influence of the topic on the method to be retained? [less ▲]

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See detailHow to develop the use of mathematical symbols at the beginning og the arithmetical and algebraic learning?
Fagnant, Annick; Vlassis, Joëlle UL; Crahay, Marcel

Scientific Conference (2004)

Detailed reference viewed: 31 (0 UL)
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See detailAgent-Based Optimization of Business Functions Using Coevolutionary Algorithms
Danoy, Grégoire UL; Bouvry, Pascal UL; Seredynski, Franciszek

in Proceedings of the International Conference on Information and Knowledge Engineering (2004)

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See detailNon-linear CCA and PCA by Alignment of Local Models
Verbeek, J. J.; Roweis, S. T.; Vlassis, Nikos UL

in Advances in Neural Information Processing Systems 16 (2004)

We propose a non-linear Canonical Correlation Analysis (CCA) method which works by coordinating or aligning mixtures of linear models. In the same way that CCA extends the idea of PCA, our work extends ... [more ▼]

We propose a non-linear Canonical Correlation Analysis (CCA) method which works by coordinating or aligning mixtures of linear models. In the same way that CCA extends the idea of PCA, our work extends recent methods for non-linear dimensionality reduction to the case where multiple embeddings of the same underlying low dimensional coordinates are observed, each lying on a different high dimensional manifold. [less ▲]

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See detailIntegration of Manual and Automatic Text Categorization. A Categorization Workbench for Text-Based Email and Spam.
Sun, Qin; Schommer, Christoph UL; Lang, Alexander

in Proceedings KI 2004 (2004)

Detailed reference viewed: 163 (0 UL)
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See detailDrosophila circadian rhythms: stability robustness analysis and model reduction
Goncalves, Jorge UL; Yi, T.-M.

in Proceedings of the 16th International Symposium on Mathematical Theory of Networks and Systems (2004)

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See detailKollektive Gewalt Allgemeine Entstehungsbedingungen von Jugendbanden und die Eskalation der Gewalt im Einwanderungskonflikt
Willems, Helmut UL; Eckert, Roland

in Aktuelle Phänomene der Gewalt. Vorträge und Diskussionen der Arbeitstagung des Bundeskriminalamtes vom 23. bis 26. November 1993. BKA-Forschungsreihe (2004), (Band 29), 179-206

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See detailZur Wirkung externaler versus internaler Aufmerksamkeitsfoki beim Erlernen einer Bewegungsfertigkeit mit proximalem Effekt
Bund, Andreas UL; Gass, Svenja; Weidenauer, Jörg

in Krug, Jürgen; Müller, Thomas (Eds.) Messplätze - Messplatztraining - Motorisches Lernen (2003, October)

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See detailGibt es Präferenzen beim selbstgesteuerten Bewegungslernen?
Bund, Andreas UL

in Krug, Jürgen; Müller, Thomas (Eds.) Messplätze - Messplatztraining - Motorisches Lernen (2003, October)

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See detailCertification logicielle de Calcul Global avec dépendances sur grille
Varrette, Sébastien UL; Roch, Jean-Louis

in Proc. des 15èmes rencontres francophones du parallélisme (RenPar'15) (2003, October)

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See detail„Kleider machen Leute“. Die äußere Erscheinung als Attribut von Personkategorien
Kneer, Julia; Krolak-Schwerdt, Sabine UL

Scientific Conference (2003, September)

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See detailUn système plurilingue peut-il être efficace?
Martin, Romain UL; Houssemand, Claude UL

in Cahiers du Service de Pédagogie Expérimentale (SPE) (2003, September), 15(16), 157-164

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See detailStrategien beim selbstgesteuerten Bewegungslernen
Bund, Andreas UL

Scientific Conference (2003, September)

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See detailWas macht Personbeschreibungen kohärent?
Wintermantel, Margret; Krolak-Schwerdt, Sabine UL; Junker, Nadine

Scientific Conference (2003, September)

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See detailSelf-poisoning in suspensions of anisotropic colloids
Schilling, Tanja UL

Scientific Conference (2003, August 28)

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See detailGoal-dependent processing of pupils’ attributes. Another facet of teachers’ expertise
Krolak-Schwerdt, Sabine UL; Rummer, Ralf

Scientific Conference (2003, August)

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See detailLa formación de las nuevas generaciones de cientificos del deporte en Alemania.
Bund, Andreas UL

Scientific Conference (2003, July)

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See detailDiagnosis and prevention of post-traumatic stress disorder in bank clerks after a robbery
Steffgen, Georges UL

Scientific Conference (2003, July)

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See detailMechanisms of unemployment and re-employment
Houssemand, Claude UL

Scientific Conference (2003, July)

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See detailAggregation on finite ordinal scales (Tutorial)
Marichal, Jean-Luc UL

in Proc. 2nd Int. Summer School on Aggregation Operators and their Applications (AGOP 2003), Alcalá de Henares (Madrid), Spain, July 14-18, 2003 (2003, July)

We give an interpretation of order invariant functions as scale independent functions for the aggregation on ¯nite ordinal scales. More precisely, we show how order invariant functions can act, through ... [more ▼]

We give an interpretation of order invariant functions as scale independent functions for the aggregation on ¯nite ordinal scales. More precisely, we show how order invariant functions can act, through discrete representatives, on ordinal scales represented by finite chains. In particular, this interpretation allows us to justify the continuity property for certain order invariant functions in a natural way. [less ▲]

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See detailClinical psychology and psychotherapy in Luxembourg
Steffgen, Georges UL

Scientific Conference (2003, July)

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See detailNuevos conocimientos sobre el aprendizaje y la enseñanza de los movimientos.
Bund, Andreas UL

Scientific Conference (2003, July)

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See detailDiane project: Women’s entrepreneurship
Constantinidis, Christina UL; Cornet, Annie

in ICSB 2003 Proceedings (2003, June 16)

Our research project aims to inquire whether there are any specificities in female entrepreneurship and if necessary to point them out. Our study will take different angles: first, the women-owned ... [more ▼]

Our research project aims to inquire whether there are any specificities in female entrepreneurship and if necessary to point them out. Our study will take different angles: first, the women-owned societies’ profile, second the women entrepreneurs’ business processes and finally the women entrepreneurs’ profile. Tools will be shaped in accordance with this analysis, in order to increase the awareness of women and intermediates of business creation and development. [less ▲]

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See detailSelbst- oder Mitbestimmung im Sportunterricht: Qualitative Aussagen von Schülerinnen und Schülern - quantitativ validiert
Bund, Andreas UL; Hönmann, Johanna; Berner, Birgit et al

Scientific Conference (2003, June)

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See detailMusique et travail social, entre éducation musicale et musicothérapie
Sagrillo, Damien UL

Scientific Conference (2003, June)

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See detailLes modes opératoires de la cryptographie symétrique
Schiltz, Jang UL

Scientific Conference (2003, May 15)

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See detailSport in Schule und Freizeit: Gibt es Synergieeffekte? Eine qualitative Befragung von Jugendlichen.
Bund, Andreas UL; Hönmann, Johanna; Berner, Birgit

Poster (2003, May)

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

in Bisdorff, Raymond (Ed.) Proc. 14th Mini-Euro Conference, Human Centered Processes, Distributed Decision Making and Man-Machine Cooperation (HCP 2003), Luxembourg, May 5-7, 2003 (2003, May)

In many multi-criteria decision making problems the criteria present some interaction whose nature may vary from one situation to another. When a criterion bounds the global score from above, it is called ... [more ▼]

In many multi-criteria decision making problems the criteria present some interaction whose nature may vary from one situation to another. When a criterion bounds the global score from above, it is called a veto, due to its rather intolerant character. When it bounds the global score from below, it is then called a favor. In this paper we investigate the tolerance of criteria, or equivalently, the tolerance of the weighted aggregation operator (here the Choquet integral) which 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. [less ▲]

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See detailSelf-controlled learning of the forehand topspin stroke in table tennis.
Bund, Andreas UL

Scientific Conference (2003, May)

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See detailEffet du climat scolaire sur la violence des élèves: Le rôle de l'enseignant
Steffgen, Georges UL

Scientific Conference (2003, May)

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See detailNew CHAMP gravity results using the energy balance approach
Weigelt, Matthias UL; Sneeuw, N.

Scientific Conference (2003, May)

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See detailPersonalauswahl: Ist das Prototypenmodell der sozialen Kognition ein geeigneter Ansatz?
Junker, Nadine; Krolak-Schwerdt, Sabine UL

Scientific Conference (2003, March)

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See detailTransfereffekte bei der Selbstregulation von Übungsbedingungen
Bund, Andreas UL

Scientific Conference (2003, January)

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See detailSemidefinite Programming for Detection in Linear Systems - Optimality Conditions and Space-Time Decoding
Jaldén, Joakim; Martin, Cristoff; Ottersten, Björn UL

in IEEE International Conference on Acoustics Speech and Signal Processing (2003)

Optimal maximum likelihood detection of finite alphabet symbols in general requires time consuming exhaustive search methods. The computational complexity of such techniques is exponential in the size of ... [more ▼]

Optimal maximum likelihood detection of finite alphabet symbols in general requires time consuming exhaustive search methods. The computational complexity of such techniques is exponential in the size of the problem and for large problems sub-optimal algorithms are required. In this paper, to find a solution in polynomial time, a semidefinite programming approach is taken to estimate binary symbols in a general linear system. A condition under which the proposed method provides optimal solutions is derived. As an application, the proposed algorithm is used as a decoder for a linear space-time block coding system and the results are illustrated with numerical examples. [less ▲]

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See detailAn Overview Of Public-Key Cryptology
Leprévost, Franck UL

in DPP 2003: International Conference on Digital Production Printing and Industrial Applications (2003)

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See detailRaman spectroscopy of single-wall BN nanotubes
de la Concha, R. A.; Wirtz, Ludger UL; Mevellec, J. Y. et al

in AIP Conference Proceedings (2003), (685), 384-388

We present results on the vibrational properties of BN-SWNTs together with a study of the synthesis material by transmission electron microscopy. Phonon modes have been investigated by Raman spectroscopy ... [more ▼]

We present results on the vibrational properties of BN-SWNTs together with a study of the synthesis material by transmission electron microscopy. Phonon modes have been investigated by Raman spectroscopy with laser excitation wavelengths in the range from 363.8 to 676.44 nm. The assignment of the modes is guided by ab-initio calculations. [less ▲]

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See detailOptical absorption in small BN and C nanotubes
Wirtz, Ludger UL; Olevano, V.; Marinopoulos, A. G. et al

in AIP Conference Proceedings (2003), 685

We present a theoretical study of the optical absorption spectrum of small boron-nitride and carbon nanotubes using time-dependent density-functional theory and the random phase approximation. Both for C ... [more ▼]

We present a theoretical study of the optical absorption spectrum of small boron-nitride and carbon nanotubes using time-dependent density-functional theory and the random phase approximation. Both for C and BN tubes, the absorption of light polarized perpendicular to the tube-axis is strongly suppressed due to local field effects. Since BN-tubes are wide band-gap insulators, they only absorb in the ultra-violet energy regime, independently of chirality and diameter. In comparison with the spectra of the single C and BN-sheets, the tubes display additional fine-structure which stems from the (quasi-) one-dimensionality of the tubes and sensitively depends on the chirality and tube diameter. This fine structure can provide additional information for the assignment of tube indices in high resolution optical absorption spectroscopy. [less ▲]

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See detailGlobal Asymptotic Stability of Oscillations with Sliding Modes
Goncalves, Jorge UL

in Proceedings of the 15th IFAC World Congress (2003)

This paper explores a new methodology based on quadratic surface Lyapunov functions to globally analyze oscillations with sliding modes in relay feedback systems (RFS). The method consists in efficiently ... [more ▼]

This paper explores a new methodology based on quadratic surface Lyapunov functions to globally analyze oscillations with sliding modes in relay feedback systems (RFS). The method consists in efficiently construct quadratic Lyapunov functions on switching surfaces that can be used to show that impact maps, i.e., maps from one switch to the next, are contracting. This, in turn, shows that the system is globally stable. Several classes of piecewise linear systems (PLS) were previously successfully analyzed with this methodology. In this paper, we consider PLS whose trajectories switch between subsystems of different dimensions. We present and discuss distinct relaxations leading to sufficient conditions of different conservatism and computationally complexity. The results in this paper open the door to the analysis of other, more complex classes of PLS. [less ▲]

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See detailProcessing of the Absolute data of the ICAG01
Francis, Olivier UL; van Dam, Tonie UL

in Francis, Olivier; van Dam, Tonie (Eds.) Proceedings of the Workshop: IMG-2002 Instrumentation and Metrology in Gravimetry (2003)

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See detailEl honor en las comedias de Lope de Vega
Gomez-Fernandez, Roberto UL

Scientific Conference (2003)

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See detailBand structure of boron doped carbon nanotubes
Wirtz, Ludger UL; Rubio, A.

in AIP Conference Proceedings (2003), 685

We present ab initio and self-consistent tight-binding calculations on the band structure of single wall semiconducting carbon nanotubes with high degrees (up to 25 %) of boron substitution. Besides a ... [more ▼]

We present ab initio and self-consistent tight-binding calculations on the band structure of single wall semiconducting carbon nanotubes with high degrees (up to 25 %) of boron substitution. Besides a lowering of the Fermi energy into the valence band, a regular, periodic distribution of the p-dopants leads to the formation of a dispersive "acceptor"-like band in the band gap of the undoped tube. This comes from the superposition of acceptor levels at the boron atoms with the delocalized carbon pi-orbitals. Irregular (random) boron-doping leads to a high concentration of hybrids of acceptor and unoccupied carbon states above the Fermi edge. [less ▲]

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See detailMaterial and Device Issues of AlGaN/GaN HEMTs on Silicon Substrates
Javorka, P.; Alam, A.; Marso, Michel UL et al

in Proceedings of the MRS Fall Meeting, Boston 2002 (2003)

Results on the preparation and properties of AlGaN/GaN HEMTs on silicon substrates are presented and selected issues related to the material structure and device performance devices are discussed ... [more ▼]

Results on the preparation and properties of AlGaN/GaN HEMTs on silicon substrates are presented and selected issues related to the material structure and device performance devices are discussed. Virtually crack-free AlGaN/GaN heterostructures (xAlN ≅ 0.25), with low surface roughness (rms of 0.64 nm), ns ≅ 1×1013 cm-2 and μ ≅ 1100 cm2/V s at 300 K, were grown by LP-MOVPE on 2-inch (111)Si substrates. HEMT devices with Lg = 0.3−0.7 μm were prepared by conventional device processing steps. Photoionization spectroscopy measurements have shown that a trap level of 1.85 eV, additional to two levels of 2.9 and 3.2 eV found before on GaN-based HEMTs on sapphire, is present in the structures investigated. Self-heating effects were studied by means of temperature dependent dc measurements. The channel temperature of a HEMT on Si increases with dissipated power much slower than for similar devices on sapphire substrate (e.g. reaches 95 and 320 °C on Si and sapphire, respectively, for 6 W/mm power). Prepared AlGaN/GaN/Si HEMTs exhibit saturation currents up to 0.91 A/mm, a good pinch-off, peak extrinsic transconductances up to 150 mS/mm and static heat dissipation capability up to ~16 W/mm. Unity current gain frequencies fT up to 21 and 32 GHz were obtained on devices with gate length of 0.7 and 0.5 μm, respectively. The saturation current and fT values are comparable to those known for similar devices using sapphire and SiC substrates. Properties of AlGaN/GaN/Si HEMTs investigated show that this technology brings a prospect for commercial application of high power rf devices. [less ▲]

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See detailPower Allocation and Bit Loading for Spatial Multiplexing in MIMO Systems
Zhang, Xi; Ottersten, Björn UL

in Proceedings IEEE International Conference on Acoustics, Speech, and Signal Processing (2003)

The power assignment problem is important for Multiple-Input-Multiple-Output (MIMO) systems to achieve high capacity. Although this problem is solved by well-known water filling algorithms, this does not ... [more ▼]

The power assignment problem is important for Multiple-Input-Multiple-Output (MIMO) systems to achieve high capacity. Although this problem is solved by well-known water filling algorithms, this does not provide an optimal solution if the system is constrained to a fixed raw bit error rate threshold and to discrete modulation s. In this work an approximate approach, called QoS based WF, is proposed to solve the power assignment problem with such constrains. It is shown to outperform quantization of the conventional water filling solution and a well known bit loading algorithm (Chow's algorithm) used in the Digital Subscriber Lines (DSL). [less ▲]

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See detailRegions of Stability for Limit Cycles of Piecewise Linear Systems
Goncalves, Jorge UL

in Proceedings of the 42th IEEE Conference on Decision and Control (2003)

This paper starts by presenting local stability conditions for limit cycles of piecewise linear systems (PLS), based on analyzing the linear part of Poincare maps. Local stability guarantees the existence ... [more ▼]

This paper starts by presenting local stability conditions for limit cycles of piecewise linear systems (PLS), based on analyzing the linear part of Poincare maps. Local stability guarantees the existence of an asymptotically stable neighborhood around the limit cycle. However, tools to characterize such neighborhood do not exist. This work gives conditions in the form of LMIs that guarantee asymptotic stability of PLS in a reasonably large region around a limit cycle, based on recent results on impact maps and surface Lyapunov functions (SuLF). These are exemplified with a biological application: a 4th-order neural oscillator, also used in many robotics applications like, for example, juggling and locomotion. [less ▲]

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See detailPeculiarities of low frequency noise in GaN-based high electron mobility transistors
Vitusevich, S. A.; Petrychuk, M. V.; Klein, N. et al

in Proc. 17th Internat. Conf. Noise and Fluctuations ICNF (2003)

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See detailUnified European Gravity Reference Network 2002 (UEGN2002), a Status Report
Kenyeres, A.; Boedecker, G.; Francis, Olivier UL

in Tziavos, Ilias N. (Ed.) Gravity and Geoid 2002 (2003)

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See detailBackgating high-current and breakdown characterisation of AlGaN/GaN HEMTs on silicon substrates
Kuzmik, J.; Blaho, M.; Pogany, D. et al

in Proceedings of the ESSDERC 2003. Estoril, Portugal (2003)

Backgating effect as well as breakdown and high-current performance of AlGaN/GaN HEMTs on silicon substrates are studied. The material structure of investigated devices differ in the thickness of ... [more ▼]

Backgating effect as well as breakdown and high-current performance of AlGaN/GaN HEMTs on silicon substrates are studied. The material structure of investigated devices differ in the thickness of stressrelaxing intermediate layer sequence (~1 μm and ~2.5 μm thick). It is shown that the transistor backgating effect is reduced for the thicker sequence. Similarly, the reverse gate current is two orders of the magnitude lower and the gate-drain breakdown voltage increases substantially in devices with the thicker sequence. Increase from ~40 V to ~160 V of the HEMT blocking capability measured under electrostatic discharge-like conditions is also observed. [less ▲]

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See detailLie-algebraic characterization of manifold structures
Poncin, Norbert UL

Scientific Conference (2003)

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See detailSixth International Comparison of Absolute Gravimeters, ICAG-2001
Vitushkin, Leonid; Jiang, Zhiheng; Becker, Matthias et al

in Francis, Olivier; van Dam, Tonie (Eds.) Proceedings of the Workshop: IMG-2002 Instrumentation and Metrology in Gravimetry (2003)

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See detailPréface
Prüm, André UL

in Les opérations boursières en Europe, vers un droit commun ? (2003)

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See detailImages de Henri VII en Italie. Les chroniques de Baudouin de Trèves et les « Vœux de l’épervier » (première moitié du XIVe siècle)
Margue, Michel UL

in Medioevo europeo : Giovanni e Carlo di Lussemburgo in Toscana (1331-1369). Atti del Convegno Internazionale di Studi, Montecarlo, 14 Iuglio 2002 (2003)

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See detailElectronic structure and optical properties of boron doped single-wall carbon nanotubes
Pichler, T.; Borowiak-Palen, E.; Fuentes, G. G. et al

in AIP Conference Proceedings (2003), 685

We present a study of the electronic structure and the optical properties of boron doped single walled carbon nanotubes which have been produced by a substitution reaction from nanotube templates. The ... [more ▼]

We present a study of the electronic structure and the optical properties of boron doped single walled carbon nanotubes which have been produced by a substitution reaction from nanotube templates. The morphology and crystal structure of the samples have been characterized by transmission electron microscopy and electron energy-loss spectroscopy. Clean boron doped SWCNT with an average boron content of 15 at% have been produced. The B1s and C1s core level spectra reveal that boron is in an sp(2) configuration and that the effective charge transfer is about 0.5 holes per boron to the C-derived states. The boron substitution also leads to new features in the optical absorption spectra which can be attributed to the appearance of an acceptor band about 0.1 eV above the top of the valence band of the SWCNT. These changes in the electronic structure and in the optical properties upon boron substitution are in good agreement with state of the art ab initio calculations. [less ▲]

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See detailImpartialité et Justice économique, rapport sur le droit luxembourgeois
Prüm, André UL

in Impartialité et justice économique en Europe (2003)

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See detailIdentifying regional varieties by pitch information: A comparison of two approaches
Peters, Jörg; Gilles, Peter UL

in Solé, M. J.; Recasens, D.; Romero, J. (Eds.) Proceedings of the 15th International Congress of Phonetic Sciences, Barcelona, August 3-9, 2003 (2003)

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See detailGGFC Special Bureau for Loading: Current status and plans
van Dam, Tonie UL; Plag, H. P.; Francis, Olivier UL et al

in Richter, Bernd; Schwegmann, Wolfgang; Dick, Wolfgang R. (Eds.) Proceedings of the IERS Workshop on Combination Research and Global Geophysical Fluids (2003)

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See detailVibrational properties of boron nitride nanotubes: Effects of finite length and bundling
Wirtz, Ludger UL; Rubio, A.

in IEEE Transactions on Nanotechnology (2003), 2

We present ab initio calculations of phonons in single-wall. boron nitride nanotubes. Raman and infrared active modes of isolated and infinitely long tubes are evaluated according to the non-symmorphic ... [more ▼]

We present ab initio calculations of phonons in single-wall. boron nitride nanotubes. Raman and infrared active modes of isolated and infinitely long tubes are evaluated according to the non-symmorphic rod groups of BN nanotubes. For tubes of finite length, the selection rules are less restrictive and give rise to additional modes which may be observed in Raman and IR spectroscopy with an intensity depending on the tube length. Bundling of tubes is shown to have little effect on the phonon frequencies. However, arranging tubes in a large periodic array (larger than the wave-length of incoming light) gives rise to a strong frequency shift (LO-TO splitting) of some modes due to the establishing of a macroscopic electric field. Modes of A(1) symmetry experience a shift for laser light along the tube axis and E-1 modes are split for light incidence in the perpendicular direction. [less ▲]

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See detailSoft Soil Creep Modelling of large settlements
Van Baars, Stefan UL

in 2nd International Conference on Advances in Soft Soil Engineering and Technology (2003)

The most commonly used model in The Netherlands to predict settlements is the Koppejan Model. This model gives reasonable predictions, but sometimes there are large discrepancies with reality. This is ... [more ▼]

The most commonly used model in The Netherlands to predict settlements is the Koppejan Model. This model gives reasonable predictions, but sometimes there are large discrepancies with reality. This is caused (among others) by: 1) The inaccurate calculation of the degree of consolidation, 2) The omission of the consolidation process for creep, which causes superposition errors for (temporarily) surcharge calculations, and 3) The omission of the waterpressures caused by creep. The problems disappear when the settlement process is solved with an incremental calculation. The results of the incremental calculations are compared with several 1-D compression tests and show good results. The Incremental Koppejan Model can easily be implemented in finite element models. In this paper also an example for a 3-D Elasto-Plastic Soft-Soil-Creep Model is presented. [less ▲]

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See detailWAPIOP - A WAP-based inter-ORB protocol
Rothkugel, Steffen UL

in Proceedings of 5th European Personal Mobile Communications Conference (Conf Publ No 492) (2003)

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See detailLe projet européen de saisie des avoirs bancaires est-il compatible avec le droit anglais ?
Cuniberti, Gilles UL

in Isnard, J.; Normand, J. (Eds.) L'amenagement du droit de l'execution dans l'espace communautaire - bientot les premiers instruments (2003)

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See detailAnalysis of the Results of the Sixth International Comparison of Absolute Gravimeters ICAG-2001
Vistuhskin, Leonid; Jiang, Zhiheng; Becker, Matthias et al

in Tziavos, Ilias N. (Ed.) Gravity and Geoid 2002 (2003)

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See detailRapport sur le Luxembourg
Prüm, André UL

in Impartialité et justice économique en Europe (2003)

Activité économique et justice économique sont liées : il ne peut y avoir de vie des affaires sans un cadre juridique fixant les règles applicables aux opérations réalisées et aux règlements des litiges ... [more ▼]

Activité économique et justice économique sont liées : il ne peut y avoir de vie des affaires sans un cadre juridique fixant les règles applicables aux opérations réalisées et aux règlements des litiges commerciaux et économiques. En dépit de son particularisme, la justice économique obéit aux règles fondamentales de l’organisation judiciaire, et notamment à l’impartialité du juge. Cet ouvrage mène une réflexion générale sur l’impartialité des juges dans la vie des affaires, dans les pays européens, à la lumière des lignes directrices retenues par la Cour européenne des droits de l’homme. Cette réflexion, rattachée à la réalité et à la vie des affaires (le secret des affaires, les conflits d’intérêts, la pression des marchés…), n’est pas le simple constat d’une situation existante mais fait également des proposions concrètes pour qu’au niveau européen le lien entre l’impartialité et la justice devienne indéfectible. [less ▲]

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See detailComparison between modeled and Observed Gravity Tidal Parameters at Ny-Alesund, Svalbard
Sato, Tadahiro; Tamura, Y; Matsumoto, K et al

in Francis, Olivier; van Dam, Tonie (Eds.) Proceedings of the Workshop: IMG-2002 Instrumentation and Metrology in Gravimetry (2003)

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See detailNumerical Simulation of a Diesel Particulate Filter during Loading and Regeneration
Peters, Bernhard UL

in ASME Internal Combustion Engine Division (2003)

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See detailSelf-Organization by Optimizing Free-Energy
Verbeek, J. J.; Vlassis, Nikos UL; Kröse, B. J. A.

in Proc. of European Symposium on Artificial Neural Networks (2003)

We present a variational Expectation-Maximization algorithm to learn probabilistic mixture models. The algorithm is similar to Kohonen's Self-Organizing Map algorithm and not limited to Gaussian mixtures ... [more ▼]

We present a variational Expectation-Maximization algorithm to learn probabilistic mixture models. The algorithm is similar to Kohonen's Self-Organizing Map algorithm and not limited to Gaussian mixtures. We maximize the variational free-energy that sums data log-likelihood and Kullback-Leibler divergence between a normalized neighborhood function and the posterior distribution on the components, given data. We illustrate the algorithm with an application on word clustering. [less ▲]

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See detailAngular distribution of highly charged ions transmitted through metallic microcapillaries
Tokesi, K.; Wirtz, Ludger UL; Lemell, C. et al

in Journal of Electron Spectroscopy & Related Phenomena (2003), 129(2-3), 195-200

The angular distribution of Xe6+ ions with an energy of 800 eV/q transmitted through Ni microcapillaries is studied by a classical trajectory simulation. The results for clean and contaminated by layers ... [more ▼]

The angular distribution of Xe6+ ions with an energy of 800 eV/q transmitted through Ni microcapillaries is studied by a classical trajectory simulation. The results for clean and contaminated by layers of insulating materials of the internal surface of capillary are presented. We show that the angular distributions can be used to identify different phases of hollow ion formation for clean metal surface. We also show that the angular distribution changes dramatically for the case of contaminated surface, i.e. when the image acceleration is depressed. (C) 2003 Elsevier Science B.V. All rights reserved. [less ▲]

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See detailComparative Law and the European Convention on Human Rights in French Human Rights Cases
Heuschling, Luc UL

in Örücü, Esin (Ed.) Judicial Comparativism in Human Rights Cases (2003)

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See detailMEDAL: A CASE Tool Extension for Model-driven Software Engineering
Guelfi, Nicolas UL; Ries, Benoît UL; Sterges, Paul UL

in SwSTE'03 IEEE International Conference on Software - Science, Technology & Engineering (2003)

The complexity of today’s software systems leads to the creation of many related diagrams, representing different viewpoints, different levels of abstraction, and different implementation alternatives ... [more ▼]

The complexity of today’s software systems leads to the creation of many related diagrams, representing different viewpoints, different levels of abstraction, and different implementation alternatives. Model-driven software engineering places these models in the center of the development process. Tool support is an essential aspect of model-driven engineering. Of particular interest are model transformation tools: they can facilitate the creation and the evolution of models; they provide a level of traceability between them and they help keeping them synchronized. Unfortunately, currently there are few such tools for UML-based models. This paper presents MEDAL, our model transformation tool. First, we present our viewpoint on model-driven software engineering. Then we describe MEDAL and how we implemented MEDAL on top of Rational XDE. Finally, in the last section we show how a web application development that is based on an architectural framework can be supported by the MEDAL tool. [less ▲]

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See detailSmectic Filaments in colloidal in colloidal suspensions of rods
Schilling, Tanja UL

Scientific Conference (2003)

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See detailMulti-Robot Decision Making Using Coordination Graphs
Kok, Jelle R.; Spaan, Matthijs T. J.; Vlassis, Nikos UL

in Proceedings of the International Conference on Advanced Robotics (ICAR) (2003)

Within a group of cooperating agents the decision making of an individual agent depends on the actions of the other agents. In dynamic environments, these dependencies will change rapidly as a result of ... [more ▼]

Within a group of cooperating agents the decision making of an individual agent depends on the actions of the other agents. In dynamic environments, these dependencies will change rapidly as a result of the continuously changing state. Via a context-specific decomposition of the problem into smaller subproblems, coordination graphs o#er scalable solutions to the problem of multiagent decision making. We will apply coordination graphs to the continuous domain by assigning roles to the agents and then coordinating the di#erent roles. Finally, we will demonstrate this method in the RoboCup soccer simulation domain. [less ▲]

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See detailLie algebras of differential operators
Poncin, Norbert UL

Scientific Conference (2003)

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See detailUn modèle cellulaire et dynamique de dispersion et ségrégation spatiale périurbaine
Caruso, Geoffrey UL

in XXXIX ème Colloque de l’Association de Science Régionale de Langue Française (2003)

Cette contribution propose d’explorer les processus de dispersion des ménages et de ségrégation par le revenu au sein d’un espace périurbain. La méthode consiste à simuler un modèle économique ... [more ▼]

Cette contribution propose d’explorer les processus de dispersion des ménages et de ségrégation par le revenu au sein d’un espace périurbain. La méthode consiste à simuler un modèle économique urbain avec deux types d’externalités de voisinage sur un espace cellulaire. Il permet la mise en place de processus dynamiques locaux endogènes et offre un éclairage sur la relation qui unit la morphologie des espaces périurbains et les caractéristiques des agents économiques qui s’y localisent. Des structures spatiales diverses sont générées sur deux configurations données des lots fonciers. Les équilibres présentent des structures concentriques constituées de multiples anneaux mais aussi, au cours des étapes de la croissance de la ville, des processus de dégradation cumulée ou des structures plus indépendantes de la distance. [less ▲]

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See detailSelbstvertrauen als Leistungsressource im Sport
Bund, Andreas UL

Scientific Conference (2002, December)

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See detailEtude de codages catégoriels et métriques de l’information visiospatiale : Conséquences sur les performances des êtres humains et des modèles
Alexandre, Frédéric; Burnod, Y; Koenig, O et al

Scientific Conference (2002, December)

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See detailLes besoins en formation des formateurs de la Grande Région
Houssemand, Claude UL

Scientific Conference (2002, November)

Detailed reference viewed: 23 (2 UL)