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See detailSelbstvertrauen als Leistungsressource im Sport
Bund, Andreas UL

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)
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See detailHypoelliptic non-homogeneous diffusions
Schiltz, Jang UL

Scientific Conference (2002, October 10)

Detailed reference viewed: 26 (0 UL)
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See detailThe nature of hyperactivity in children with hydrocephalus
Stevenson, Jim; Pit-Ten Cate, Ineke UL

Scientific Conference (2002, October)

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See detailPeer relations and neuropsychological abilities in children with hydrocephalus and/or spina bifida
Stevenson, Jim; Pit-Ten Cate, Ineke UL

Scientific Conference (2002, October)

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See detailArbeitsgedächtniskapazität und Interferenzeffekte
Reichert, Monique UL; Sander, Nicolas; Süß, Heinz-Martin

Scientific Conference (2002, September 22)

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See detailEinfluss der Textkohärenz auf das Behalten von Personbeschreibungen
Krolak-Schwerdt, Sabine UL; Wintermantel, Margret

Scientific Conference (2002, September)

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See detailBehaviour problems and expressed emotion in children with spina bifida and/or hydrocephalus
Pit-Ten Cate, Ineke UL; Stevenson, Jim

Scientific Conference (2002, September)

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See detailClusteranalytische Verfahren zur Analyse zwei- und dreimodaler Daten.
Krolak-Schwerdt, Sabine UL

Scientific Conference (2002, July)

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See detailOn order invariant synthesizing functions
Marichal, Jean-Luc UL

in Proc. 9th Int. Conf. on Information Processing and Management of Uncertainty in Knowledge-Based Systems (IPMU 2002), Annecy, France, July 1-5, 2002 (2002, July)

We give a description of the class of continuous functions that are comparison meaningful in the sense of measurement theory. When idempotency is assumed, this class reduces to the Boolean max-min ... [more ▼]

We give a description of the class of continuous functions that are comparison meaningful in the sense of measurement theory. When idempotency is assumed, this class reduces to the Boolean max-min functions (lattice polynomials). In that case, continuity can be replaced by increasing monotonicity, provided that the domain of definition is open. [less ▲]

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See detailAn axiomatic approach to the definition of the entropy of a discrete Choquet capacity
Kojadinovic, Ivan; Marichal, Jean-Luc UL; Roubens, Marc

in Proc. 9th Int. Conf. on Information Processing and Management of Uncertainty in Knowledge-Based Systems (IPMU 2002), Annecy, France, July 1-5, 2002 (2002, July)

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See detailRSA: bases mathématiques
Schiltz, Jang UL

Scientific Conference (2002, May 16)

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See detailSelbstvertrauen, Vorstellungsinhalte und Vorstellungskompetenz von Sportlerinnen und Sportlern.
Bund, Andreas UL

in Strauß, Bernd; Tietjens, Maike; Hagemann, Norbert (Eds.) et al Expertise im Sport.Lehren, Lernen, Leisten (2002, May)

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See detailAufmerksamkeitsfokus beim Bewegungslernen
Bund, Andreas UL; Gass, Svenja; Weidenauer, Jörg

Poster (2002, February)

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See detailWas möchten Bewegungslernende selbst bestimmen?
Bund, Andreas UL

Poster (2002, February)

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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 detailInvestigation of current collapse in doped and undoped AlGaN/GaN HEMTs
Wolter, M.; Javorka, P.; Marso, Michel UL et al

in Proc. 4th Intern. Conf. Advanced Semicon. Dev. & Microsystems (2002)

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See detailDiskussionsbeitrag
Cole, Mark UL

in BLM-Symposion Medienrecht 2001: Zwischen Intendantenbefugnis und Zensurverbot: Jugendschutz in privaten Rundfunkangeboten in Bayern (2002)

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See detail„Catinou et Jacouti“. L’usage de l’occitan et du français dans une chronique occitane.
Weth, Constanze UL

in Weydt, Harald (Ed.) Langue – Communauté – Signification: Approches en Linguistique Fonctionnelle. Actes du XXVème Colloque International de Linguistique Fonctionnelle. (2002)

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See detailMSM Diodes Based on an AlGaN/GaN HEMT Layer Structure for Varactor and Photodiode Application
Marso, Michel UL; Bernát, J.; Wolter, M. et al

in , Proc. 4th Intern. Conf. Advanced Semicon. Dev. & Microsystems (2002)

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See detailLe contrôle du Congrès sur la Securities and Exchange Commission (SEC)
Conac, Pierre-Henri UL

in Le contrôle du Congrès sur la Securities and Exchange Commission (SEC) (2002)

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See detailUsing and Specializing a Pattern-Based E-business Framework: An Auction Case Study
Guelfi, Nicolas UL; Ries, Benoît UL

in The 6th Annual IASTED International Conference on Software Engineering and Applications (2002)

Sun's J2EE environment is becoming one of the major technologies for the development of web applications. The reuse of stable and integrated components is a well-known mean to achieve effective software ... [more ▼]

Sun's J2EE environment is becoming one of the major technologies for the development of web applications. The reuse of stable and integrated components is a well-known mean to achieve effective software development. Frameworks have this objective but few frameworks are available for the J2EE platform, and moreover, they are rarely integrated in a global methodological approach supported by a tool. Furthermore, the available literature mainly provides a general conceptual presentation of frameworks. The objective of this paper is to present, from a pragmatic perspective, the use of the J2EE framework called JAFAR devoted to the development of web applications. As JAFAR has been developed from a software engineering point of view, we also show how its use can be supported by CASE tools that support design modeling and allows pattern-based development. For this purpose we used the Rational environment. [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 Mat. Res. Soc. Symp. Proc. Vol. 743 (2002), 743, L9.1.1

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 detailOn the Variations in Capacity of MIMO Communication Systems to Channel Perturbations
Shankar, Bhavani UL; Hari, K. V. S.

in Proceedings of IEEE ICPWC (2002)

It is known that the capacity of a multi-antenna flat non-fading Gaussian channels (MIMO capacity) can be improved if the transmitter has perfect knowledge of channel. The channel information affects the ... [more ▼]

It is known that the capacity of a multi-antenna flat non-fading Gaussian channels (MIMO capacity) can be improved if the transmitter has perfect knowledge of channel. The channel information affects the input allocation and hence there is capacity degradation when the transmitter does not know the channel perfectly. In this work variation in MIMO capacity due to small perturbations that do not change the rank of the channel is studied. The need for the analysis is highlighted by the fact that at high SNR, most channel estimation algorithms give small errors. Expressions and bounds for capacity are derived using first order perturbation analysis. Further to this, the dependence of capacity on the channel parameters and total power is studied. It is shown that the upper bound on degradation in capacity for small errors varies as the square of the spectral norm of perturbation. Further the degradation has an approximate inverse square relation with total power used and channel singular values. These results are extended to a general class of communication systems and results for MIMO-OFDM systems over frequency selective channels are presented. [less ▲]

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See detailFast nonlinear dimensionality reduction with topology representing networks
Verbeek, J. J.; Vlassis, Nikos UL; Kröse, B.

in Proc. Europ. Symp. on Artificial Neural Networks (2002)

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See detailSuggestions for Better Integrating ICT Enhanced Instructional Approaches Into Campus-Based Higher Education
Molz, Markus UL; Eckhardt, Antje; Schnotz, Wolfgang

in The new educational benefits of ICT in higher education : proceedings (2002)

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See detailThe New IERS Special Bureau for Loading (SBL)
van Dam, Tonie UL; Plag, Hans-Peter; Blewitt, Geoffrey et al

in International VLBI Service for Geodesy and Astrometry: General Meeting Proceedings (2002)

Currently, the establishment of the International Earth Rotation Service (IERS) Special Bureau for Loading (SBL) is in progress as part of the IERS Global Geophysical Fluids Center (GGFC). The main ... [more ▼]

Currently, the establishment of the International Earth Rotation Service (IERS) Special Bureau for Loading (SBL) is in progress as part of the IERS Global Geophysical Fluids Center (GGFC). The main purpose of the SBL is to provide reliable, consistent model predictions of loading signals that have been thoroughly tested and validated. The products will describe at least the surface deformation, gravity signal and geo-center variations due to the various surface loading processes in reference frames relevant for direct comparison with existing geodetic observing techniques. To achieve these goals, major scientific advances are required with respect to the Earth model, the theory and algorithms used to model deformations of the Earth as well as improvements in the observational data related to surface loading. [less ▲]

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See detailFreestanding LT GaAs as a subpicosecond photoconductive switch and high-voltage photomixer
Mikulics, M.; Siebel, F.; Zheng, X. et al

in Abstract book of 4th Symposium on Non-Stoichiometric III-V Compounds (2002), Physik Mikrostrukturierter Halbleiter 27

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See detailAuxiliary particle filter robot localization from high-dimensional sensor observations
Vlassis, Nikos UL; Terwijn, B.; Krose, B.

in IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION, VOLS I-IV, PROCEEDINGS (2002)

We apply the auxiliary particle filter algorithm of Pitt and Shephard (1999) to the problem of robot localization. To deal with the high-dimensional sensor observations (images) and an unknown observation ... [more ▼]

We apply the auxiliary particle filter algorithm of Pitt and Shephard (1999) to the problem of robot localization. To deal with the high-dimensional sensor observations (images) and an unknown observation model., we propose the use of an inverted nonparametric observation model computed by nearest neighbor conditional density estimation. We show that the proposed model can lead to a fully adapted optimal filter, and is able to successfully handle image occlusion and robot kidnap. The proposed algorithm is very simple to implement and exhibits a high degree of robustness in practice. We report experiments involving robot localization from omnidirectional vision in an indoor environment. [less ▲]

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See detailQuadratic Surface Lyapunov Functions in the Analysis of Feedback Systems with Double Integrators and Saturations
Goncalves, Jorge UL

in Proceedings of the 10th IEEE Mediterranean Conference on Control and Automation (2002)

Many systems like servo systems, satellites, harddisks, and CD players, can be modeled as linear systems with a single integrator and a saturation. Many times, such systems are controlled with a PI ... [more ▼]

Many systems like servo systems, satellites, harddisks, and CD players, can be modeled as linear systems with a single integrator and a saturation. Many times, such systems are controlled with a PI controller resulting in a feedback interconnection with a double integrator and a saturation. In this paper, we propose a loop transformation that results in bounded operators so that classical analysis tools like mu􀀀-analysis or IQCs can be applied. In order to show boundedness of all operators, we use quadratic surface Lyapunov functions to efficiently check if a double integrator in feedback with a saturation nonlinearity has L2 􀀀-gain less than gamma > 0 􀀀. We show that for many of such systems, the L2 􀀀-gain is non-conservative in the sense that this is approximately equal to the lower bound obtained by replacing the saturation with a constant gain of . [less ▲]

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See detailRF small-signal and power characterization of AlGaN/GaN HEMTs
Fox, A.; Marso, Michel UL; Javorka, P. et al

in , Proc. 4th Intern. Conf. Advanced Semicon. Dev. & Microsystems (2002)

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See detailAbsolute gravity measurements in Belgium: a tool for geodynamic interpretation
Van Camp, Michel; Francis, Olivier UL; Camelbeeck, Thierry

in Degryse, Patrick; Sintubin, Manuel (Eds.) Contributions to the Geology of Belgium and Northwest Europe (2002)

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See detailFrench Atlantic Coastal Trade in the Eighteenth Century: The case of Bordeaux.
Voss, Peter UL

in Armstrong, John; Kunz, Andreas (Eds.) Coastal Shipping and the European Economy, 1750-1850 (2002)

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See detailFast Nonlinear Dimensionality Reduction With Topology Preserving Networks
Verbeek, J. J.; Vlassis, Nikos UL; Kröse, B.

in Proceedings of the Tenth European Symposium on Artificial Neural Networks (2002)

We present a fast alternative for the Isomap algorithm. A set of quantizers is fit to the data and a neighborhood structure based on the competitive Hebbian rule is imposed on it. This structure is used ... [more ▼]

We present a fast alternative for the Isomap algorithm. A set of quantizers is fit to the data and a neighborhood structure based on the competitive Hebbian rule is imposed on it. This structure is used to obtain low-dimensional description of the data by means of computing geodesic distances and multi dimensional scaling. The quantization allows for faster processing of the data. The speed-up as compared to Isomap is roughly quadratic in the ratio between the number of quantizers and the number of data points. [less ▲]

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See detailInvited talk -Verarbeitung von personenbeschreibenden Texten
Krolak-Schwerdt, Sabine UL

Scientific Conference (2002)

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See detailL2-gain of double integrators with saturation nonlinearity
Goncalves, Jorge UL

in Proceedings of the 15th IFAC World Congress (2002)

This paper uses quadratic surface Lyapunov functions to efficiently check if a double integrator in feedback with a saturation nonlinearity has L2-gain less than gamma > 0. We show that for many of such ... [more ▼]

This paper uses quadratic surface Lyapunov functions to efficiently check if a double integrator in feedback with a saturation nonlinearity has L2-gain less than gamma > 0. We show that for many of such systems, the L2-gain is non-conservative in the sense that they are approximately equal to the low erbound obtained by replacing the saturation with a constant gain of 1. These results allow the use of classical analysis tools like mu -analysis or IQCs to analyze systems with double integrators and saturations, including servo systems like some mechanical systems, satellites, hard-disks, CD players, etc. [less ▲]

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See detailUntersuchungen zur regionalen Färbung der Intonation des Standarddeutschen. Diskussion eines methodischen Zugangs
Gilles, Peter UL

in Wiesinger, Peter (Ed.) Akten des X. Internationalen Germanistenkongresses (2002)

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See detailInternational Responsibility of the European Community and of the Member States under Mixed Agreements
Neframi, Eleftheria UL

in Cannizzaro, Enzo (Ed.) The European Union as an Actor in International Relations (2002)

Detailed reference viewed: 94 (1 UL)
See detailHigh-performance AlGaN/GaN HEMTs on silicon substrates
Javorka, P.; Alam, A.; Fox, A. et al

in Proc. 4th Intern. Conf. Advanced Semicon. Dev. & Microsystems (2002)

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See detailThin low-temperature gate oxides for vertical field-effect transistor, ,
Goryll, M.; Moers, J.; Trellenkamp, St et al

in Proc. 4th Intern. Conf. Advanced Semicon. Dev. & Microsystems (2002)

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See detailAbout the flexibility of the minus sign in solving equations
Vlassis, Joëlle UL

in Proceedings of the 26th International conferecne for the Psychology of M athematics Education (PME 26) (2002)

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See detailKant et Hamann : Langage et critique de la raison
Sosoe, Lukas UL

in Piché, Claude (Ed.) Années 1781-1801. Kant Critique de la raison pure (2002)

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See detailGeneration of 460 GHz radiation by photomixing in low-temperature-grown MBE GaAs
Mikulics, M.; Siebel, F.; Fox, A. et al

in Proc. 4th Intern. Conf. Advanced Semicon. Dev. & Microsystems (2002)

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See detailPsychosomatic pathways to essential hypertension: the combined effect of anger and family history of cardiovascular disorders on cardiovascular reactivity
Vögele, Claus UL

in Excerpta Medica International Congress Series1241 (2002)

Previous results from our laboratory suggest a combined effect of anger-suppression and family history of cardiovascular disorders in determining cardiovascular responses to mental stress. The present ... [more ▼]

Previous results from our laboratory suggest a combined effect of anger-suppression and family history of cardiovascular disorders in determining cardiovascular responses to mental stress. The present study was designed to determine the effect sizes in cardiovascular reactivity associated with biological risk, psychological risk and the combination of these risk factors using meta-analytical techniques. Results from three independent studies with almost identical experimental procedures provided the basis for the calculation of d, the difference between the means of two groups, divided by the pooled within-group standard deviation. Effect sizes were calculated for the comparison of high versus low biological hypertension risk, high versus low anger suppression, and high versus low combined risk. The results show the largest effect sizes for the comparison of high versus low combined risk. The effect sizes associated with the combination of risk factors were larger than the sum of the effect sizes associated with either factor alone. We conclude that the combination of biological and psychological risk factors in determining cardiovascular reactivity to mental stress is more than the sum of its parts. These findings are discussed in terms of a better understanding of the over-additive effects of multiple cardiovascular risk factors on cardiovascular morbidity and mortality. [less ▲]

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See detail"Fortalecer los niños!" Aspectos psicológicos del entrenamiento de los deportistas juveniles
Bund, Andreas UL

Scientific Conference (2001, November)

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See detailThe atlas of leper houses in the Rhineland
Uhrmacher, Martin UL

Scientific Conference (2001, October 30)

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See detailSelected issues of feedback and motor learning
Bund, Andreas UL

Scientific Conference (2001, October)

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See detailSex differences in spatial cognition: A critical test of the "hunter-gatherer" theory.
Reuter, Robert UL

Scientific Conference (2001, September 08)

The present study tested two predictions of the “hunter-gatherer” theory of sex differences in spatial cognition. According to this theory, men and women have faced different evolutionary pressures on ... [more ▼]

The present study tested two predictions of the “hunter-gatherer” theory of sex differences in spatial cognition. According to this theory, men and women have faced different evolutionary pressures on their spatial capacities (Ridley 1994). On average, males are hence expected to exhibit better navigational capacities than females (Martin 1998), while females can be assumed to exhibit better incidental object location memory capacities than males (Silverman & Eals 1992, Eals & Silverman 1994). Our study directly addressed this alleged pattern of sexual dimorphism in spatial abilities using (1) a spatial navigation task involving the exploration of a computer-based 3D virtual environment developed by Martin (1998); and (2) an exact replication of the object location memory task developed by Eals et al. (1994), involving pseudo-objects in order to reduce contamination by verbal encoding strategies. Results replicated the well-established male advantage in spatial navigation, while showing an unexpected female disadvantage in incidental object location memory. Further research is thus needed to explore the assumed female advantage in object location memory. [less ▲]

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See detailThe relationship between body image and psychosocial adjustment in adolescents with spina bifida
Fulcher, A.B:; Pit-Ten Cate, Ineke UL; Stevenson, Jim

Poster (2001, September)

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See detailMethods and Results in Folksong Analysis
Sagrillo, Damien UL

Scientific Conference (2001, September)

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See detailCats could be dogs, but dogs could not be cats: what if they bark and mew? A Connectionist Account of Early Infant Memory and Categorization
Reuter, Robert UL

in Proceedings of the 23rd Annual Conference of the Cognitive Science Society (2001, August 01)

The goal of this paper is to replicate and extend the connectionist model presented by Mareschal and French(1997) as an account of 'the particularities of […] infant memory and categorization'. With ... [more ▼]

The goal of this paper is to replicate and extend the connectionist model presented by Mareschal and French(1997) as an account of 'the particularities of […] infant memory and categorization'. With infants, the sequential presentation of cats followed by dogs yields an expected increase in infants' looking time, whereas the reversed presentation order does not. This intriguing asymmetry of infants' category formation, first reported by Quinn, Eimas, and Rosenkrantz (1993), was simulated by Mareschal et al.'s simple connectionist network. In addition, the authors proposed that this asymmetric categorization is a natural b yproduct of the 'asymmetric overlaps of the visual feature distributions' of cats and dogs. Using a simple feed forward backpropagationnetwork, we successfully replicated this asymmetric categorization effect, as well as a reported asymmetric exclusivity effect in the two categories, and anasymmetric interference effect of learning dogs on the memory for cats, but not of learning cats on the memory for dogs. We furthermore investigated the authors'explanation of the asymmetric effects, firstly, by systematically varying the overall similarity between learned items and interfering items, and secondly, by adding a binary feature to the input set, namely the animal cry (barking vs. mewing). The results of the present modeling underscore the authors' explanation of the observed effects in infants' memory and categorization, but also suggest lines of further experimental research susceptible to undermine the proposed connectionist account. [less ▲]

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See detailAge-related differences in inhibition and working memory capacity: a test of the May, Hasher and Kane hypothesis.
Reichert, Monique UL; Süß, Heinz-Martin; Sander, Nicolas

Poster (2001, July 11)

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See detailSelf-confidence and sports performance
Bund, Andreas UL

Scientific Conference (2001, July)

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See detailSelf-confidence and sports performance
Bund, Andreas UL

in Mester, J.; King, G.; Strüder, H. (Eds.) et al 6th Annual Conference of the ECSS. Book of Abstracts (2001, July)

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See detailSelbstmotivierung durch Selbstvertrauen
Bund, Andreas UL; Kiefer, Alexander

in Prohl, Robert (Ed.) Bildung und Bewegung (2001, June)

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See detailL’éducation à la citoyenneté : à quelles conceptions fait-on allusion ?
Meyers, Christian UL

Scientific Conference (2001, May 17)

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See detailContextual Cueing of Visuo-Spatial Attention: Implicit or Explicit Learning?
Reuter, Robert UL; Cleeremans, Axel

Scientific Conference (2001, May 04)

Chun and colleagues (Chun et al. 1998, 1999; Chun, 2000) have recently demonstrated that visuo-spatial attention can be guided by top-down visual knowledge. In a visual search task Ss have indeed be shown ... [more ▼]

Chun and colleagues (Chun et al. 1998, 1999; Chun, 2000) have recently demonstrated that visuo-spatial attention can be guided by top-down visual knowledge. In a visual search task Ss have indeed be shown to efficiently use global context (the spatial layout of distractor items) to detect targets. Visual search RTs are thus faster when Ss respond to targets imbedded in invariant (repeated or learned) visual configurations than in variable (unrepeated) configurations. ‘Contextual cueing effects’ have been observed despite poor explicit recognition performance for the invariant configurations. The present study replicates the contextual cueing effect with more heterogeneously distributed distractor configurations. Furthermore, while explicit recognition scores suggest that Ss can discriminate between invariant and variant visual configurations, no correlation was observed between recognition and search performance. These results will be discussed in the context ongoing controversy about the extent to which learning can be implicit. [less ▲]

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See detailDie Bedeutung differentialpsychologischer Variablen für das Bewegungslernen am Beispiel des Selbstvertrauens
Bund, Andreas UL

in Seiler, Roland; Birrer, Daniel; Schmid, Jörg (Eds.) et al Sportpsychologie: Anforderungen - Anwendungen - Auswirkungen (2001, May)

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See detailOn a sorting procedure in the presence of qualitative interacting points of view
Marichal, Jean-Luc UL; Roubens, Marc

in Klement, Erich Peter; Roubens, Marc (Eds.) Proc. 22nd Linz Seminar on Fuzzy Set Theory (LINZ 2001): Valued Relations and Capacities in Decision Theory (2001, February)

We present a sorting procedure for the assignment of alternatives to graded classes. The available information is given by partial evaluations of the alternatives on ordinal scales representing ... [more ▼]

We present a sorting procedure for the assignment of alternatives to graded classes. The available information is given by partial evaluations of the alternatives on ordinal scales representing interacting points of view and a subset of prototypic alternatives whose assignment is imposed beforehand. The partial evaluations of each alternative are embedded in a common interval scale by means of commensurateness mappings, which in turn are aggregated by the discrete Choquet integral. The behavioral properties of this Choquet integral are then measured through importance and interaction indices. [less ▲]

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See detailL’idée de citoyenneté : De quoi parle-t-on ?
Meyers, Christian UL

Poster (2001, January 31)

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See detailSekilas tentang Keamanan di Jaringan Komputer
Müller, Volker UL

in Sintesis - Makalah Universitas Kristen Indonesia (2001)

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See detailInnerer und äußerer Sinn. Kants Konstitutionstheorie empirischen Selbstbewusstseins
Heidemann, Dietmar UL

in Gerhardt, V.; Horstmann, R.-P.; Schumacher, R. (Eds.) Kant und die Berliner Aufklärung. Akten des IX. Internationalen Kant-Kongresses Berlin 2000 (2001)

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See detailBerezin-Toeplitz quantization of compact Kähler manifolds
Schlichenmaier, Martin UL

in Coherent States, Quantization and Gravity, Proceedings of the XVII Workshop on Geometric Methods in Physics (2001)

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See detailInvited talk - Bimodale Clusteranalyse
Krolak-Schwerdt, Sabine UL

Scientific Conference (2001)

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See detailInvestigations on the influence of traps in AlGaN/GaN HEMTs
Wolter, M.; Javorka, P.; Marso, Michel UL et al

in EDMO (2001)

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See detailBerezin-Toeplitz Quantization and Berezin Transform
Schlichenmaier, Martin UL

in Long Time Behaviour of Classical Quantum Systems. Proceedings of the Bologna APTEX International Conference (2001)

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See detailEinführung der neuen DIN 1045-1
Lungershausen, Henning; Schäfer, Markus UL

Scientific Conference (2001)

Scipt for seminaries of DIN Seminare e.V.

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See detailOptimization of AlGaN/GaN HEMT performance
Javorka, P.; Wolter, M.; Alam, A. et al

in Proc. EDMO (2001)

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See detailVaractor Diodes based on an AlGaN/GaN HEMT layer structure
Marso, Michel UL; Wolter, M.; Bernát, J. et al

in EProc. EDMO (2001)

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See detailA soft k-segments algorithm for principal curves
Verbeek, J. J.; Vlassis, Nikos UL; Krose, B.

in ARTIFICIAL NEURAL NETWORKS-ICANN 2001, PROCEEDINGS (2001)

We propose a new method to find principal curves for data sets. The method repeats three steps until a stopping criterion is met. In the first step, k (unconnected) line segments are fitted on the data ... [more ▼]

We propose a new method to find principal curves for data sets. The method repeats three steps until a stopping criterion is met. In the first step, k (unconnected) line segments are fitted on the data. The second step connects the segments to form a polygonal line, and evaluates the quality of the resulting polygonal line. The third step inserts a new line segment. We compare the performance of our new method with other existing methods to find principal curves. [less ▲]

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See detailLe corpus législatif de la ville de Luxembourg reconstitué à travers la pratique administrative et judiciaire
Pauly, Michel UL

in Cauchies, Jean-Marie; Bousmar, Eric (Eds.) Faire bans, edictz et statuz. Légiférer dans la ville médiévale. Sources, objets et acteurs de l'activité législative communale en Occident, ca. 1200-1550. Actes du colloque international tenu à Bruxelles les 17-20 novembre 1999 (2001)

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See detailGlobal analysis of piecewise linear systems using impact maps and quadratic surface Lyapunov functions
Goncalves, Jorge UL; Megretski, A.; Dahleh, M. A.

in Proceedings of the European Control Conference (ECC) 2001 (2001)

In this paper we develop an entirely new constructive global analysis methodology for a class of hybrid systems known as Piecewise Linear Systems (PLS). This methodology consists in inferring global ... [more ▼]

In this paper we develop an entirely new constructive global analysis methodology for a class of hybrid systems known as Piecewise Linear Systems (PLS). This methodology consists in inferring global properties of PLS solely by studying their behavior at switching surfaces associated with PLS. The main idea is to analyze impact maps, i.e., maps from one switching surface to the next switching surface, by constructing quadratic Lyapunov functions on switching surfaces. We found that an impact map induced by an LTI flow between two switching surfaces can be represented as a linear transformation analytically parameterized by a scalar function of the state. This representation of impact maps allows the search for quadratic surface Lyapunov functions to be done by simply solving a set of LMIs. Global asymptotic stability, robustness, and performance of limit cycles and equilibrium points of PLS can this way be efficiently checked. These new results were successfully applied to certain classes of PLS. Although this analysis methodology yields only sufficient criteria of stability, it has shown to be very successful in globally analyzing a large number of examples with a locally stable limit cycle or equilibrium point. In fact, it is still an open problem whether there exists an example with a globally stable limit cycle or equilibrium point that cannot be successfully analyzed with this new methodology. Examples analyzed include systems of relative degree larger than one and of high dimension, for which no other analysis methodology could be applied. [less ▲]

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See detailBiosystems Engineering: Applying methods from systems theory to biological systems
Kremling, A.; Sauter, Thomas UL; Bullinger, E. et al

in Proceedings of the 2nd International Conference on Systems Biology 4.-7.11.2001, Pasadena (2001)

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See detailLow-temperature-grown MBE GaAs for terahertz photomixers
Mikulics, M.; Marso, Michel UL; Fox, A. et al

in EDMO (2001)

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See detailFocussing und Motopädagogik
Wantz, Marc UL

Scientific Conference (2001)

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See detailVertical incidence of slow Ne10+ ions on an LiF surface: Suppression of the trampoline effect
Wirtz, Ludger UL; Lemell, C.; Reinhold, C. O. et al

in Nuclear Instruments & Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms (2001), 182

We present a Monte Carlo simulation of the neutralization of a slow Ne10+ ion in vertical incidence on an LiF(100) surface. The rates for resonant electron transfer between surface F- ions and the ... [more ▼]

We present a Monte Carlo simulation of the neutralization of a slow Ne10+ ion in vertical incidence on an LiF(100) surface. The rates for resonant electron transfer between surface F- ions and the projectile are calculated using a classical trajectory Monte Carlo simulation, We investigate the influence of the hole mobility on the neutralization sequence. It is shown that backscattering above the surface due to the local positive charge up of the surface ("trampoline effect") does not take place. (C) 2001 Elsevier Science B.V. All rights reserved. [less ▲]

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See detailScattering of highly charged ions at microcapillaries
Tokesi, K.; Wirtz, Ludger UL; Lemell, C. et al

Scientific Conference (2001)

Transmission of highly charged ions through microcapillaries is studied theoretically by a classical trajectory simulation based on the classical-over-the-barrier model. The interaction of highly charged ... [more ▼]

Transmission of highly charged ions through microcapillaries is studied theoretically by a classical trajectory simulation based on the classical-over-the-barrier model. The interaction of highly charged ions with the internal surface of the capillary is treated within the framework of dielectric response theory. We find the resulting charge state distribution of transmitted projectiles in good agreement with measurements. We analyze the angular distributions and the distribution of the mean occupation numbers of n shells of highly charged ions. We also present theoretical results of the energy loss of the highly charged ions undergoing distant collisions at grazing incidence angles with the internal surface of the microcapillary target. [less ▲]

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See detailCore Properties from Superconducting Gravimeter Data
Smylie; Francis, Olivier UL; Henderson, Gary

in Romanowicz, Barbara; Suyehiro, Kiyoshiro (Eds.) Long-term Observations in the Oceans - Current Status and Perspectives for the Future (2001)

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See detailLearning Task-Relevant Features From Robot Data
Vlassis, Nikos UL; Bunschoten, Roland; Kröse, Ben

in IEEE International Conference on Robotics and Automation, 2001. Proceedings 2001 ICRA. (2001)

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See detail"Wy ritterliche sy dâ streit". Kloster und Burg
Margue, Michel UL

in Berg, Guy (Ed.) Man mohte schriven wal ein buch: Ergebnisse des Yolanda-Kolloquiums 26. - 27. November 1999 Luxemburg, Vianden und Ansemburg (2001)

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See detailLes marchés annuels en Europe aux XIVe-XVIe siècles. Études régionales et essai de classification
Pauly, Michel UL

in Cavaciocchi, Simonetta (Ed.) Fieri e mercati nella integrazione delle economie europee secc. XIII-XVIII. Atti della «Trentaduesima Settimana di Studi» 8-12 maggio 2000 (2001)

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See detailSolving equations with negatives or crossing the formalizing gap
Vlassis, Joëlle UL

in Vlassis, Joëlle (Ed.) Proceedings of the 25th International conference for the Psychology of M athematics Education (PME 25) (2001)

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See detailSystem Evaluation of Optimal Downlink Beamforming in Wireless Communication
Stridh, Rickard; Bengtsson, Mats; Ottersten, Björn UL

in Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th (2001)

We investigate the use of joint optimal downlink beamforming, power control and access point allocation, in a multicell SDMA system. Smart antennas are used at the access points and single antennas are ... [more ▼]

We investigate the use of joint optimal downlink beamforming, power control and access point allocation, in a multicell SDMA system. Smart antennas are used at the access points and single antennas are used at the terminals. The possibility to send messages to multiple terminals on the same frequency in the same time slot is exploited. An algorithm for removing users from a congested system, in order to avoid outage is proposed and evaluated Results show that the proposed algorithm gives substantial increase of the system performance compared to random removal of users. [less ▲]

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See detailDynamics of the swollen lamellar phase
Schilling, Tanja UL

Scientific Conference (2001)

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See detailVertical Double-Gate MOSFET Based on Epitaxial Growth
Moers, J.; Trellenkamp, St; Vescan, L. et al

in Proceedings of the 31st European Solid State Devices Research Conference, Nürnberg, Germany (2001)

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