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See detail2d PHT splines implementation in C++
Peng, Xuan; Bordas, Stéphane UL

Learning material (2016)

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See detail2D Tool-Path Generation Method for Multi-Axis Milling Machine using ToF camera
Ahmad, Rafiq UL; Plapper, Peter UL

Scientific Conference (2014, September 12)

Multi-axis machines are known for their precise production of complex parts, where multi-tool are working in the same area or static workpiece support or clamping parts, may cause collision problems. It ... [more ▼]

Multi-axis machines are known for their precise production of complex parts, where multi-tool are working in the same area or static workpiece support or clamping parts, may cause collision problems. It is therefore necessary to identify potential collision risks and avoid them in an efficient way, which may cause production stops and machinery damage. This research study has been focusing on safe non-functional (rapid) tool-path generation for multi-axis milling machine, where no efficient automatic collision avoidance solution exists (in the literature). A 3D Time of Flight (TOF) camera attached into the machine will be able to sense any unwanted situation in the manufacturing environment and provide rapid and automatic solution to detect and avoid collisions for safe tool movements during production. In the presence of obstacles, the proposed approach will provide decisions regarding tool-path correction and improvement automatically. The proposed algorithm based on 3D vision concept is also able to take into account unknown obstacle shape, size during production but dynamic aspects of the scene will be treated in future. The concept presented take into account the 3D information from the scene for traversal safe tool-paths generation for a static environment as an initial application, which will be adapted to more complex real machining scenarios by integrating it with STEP-NC technology in future. [less ▲]

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See detailThe 2nd MYNT
Yoo, Hwajong UL

Presentation (2013, August 28)

We present the multiplicity one theorem for Eisenstein maximal ideals.

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See detailA 3.2% efficient Kesterite device from electrodeposited stacked elemental layers
Scragg, Jonathan J.; Berg, Dominik UL; Dale, Phillip UL

in Journal of Electroanalytical Chemistry (2010), 646(1-2), 52-59

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See detail30 Jahre Geschichte - 700 Jahre Tradition - 171 Minuten Film. Das Heldenepos ‚Braveheart‘ (USA, 1995) von und mit Mel Gibson
Kolnberger, Thomas UL

in Historische Sozialkunde: Geschichte - Fachdidaktik - Politische Bildung (2006), 3

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See detail30. Symposium Klinische Psychologie und Psychotherapie, Abstractband
Vögele, Claus UL

Book published by University of Luxembourg (2012)

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See detail§ 36. Die Pädagogik
Oelkers, Jürgen; Tröhler, Daniel UL

in Holzhey, Helmut; Mudroch, Vilem (Eds.) Die Philosophie des 18. Jahrhunderts 5/1+2: Heiliges Römische Reich Deutscher Nation. Schweiz. Nord- und Osteuropa (2014)

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See detail3D Beamforming for Spectral Coexistence of Satellite and Terrestrial Networks
Sharma, Shree Krishna UL; Chatzinotas, Symeon UL; Grotz, Joel et al

in IEEE Vehicular Technology Conference 2015 (2015, September)

Satellite communication (SatCom) is facing a spectrum scarcity problem due to the limited available exclusive spectrum and the high demand of the broadband satellite services. In this context, there has ... [more ▼]

Satellite communication (SatCom) is facing a spectrum scarcity problem due to the limited available exclusive spectrum and the high demand of the broadband satellite services. In this context, there has been an increasing interest in the satellite community to exploit the non-exclusive Ka-band spectrum in order to enhance the spectral efficiency of future broadband satellite systems. Herein, we propose a novel concept of enabling the spectral coexistence of satellite and terrestrial networks using three dimensional (3D) beamforming, which exploits the elevation dimension in addition to the commonly used azimuth dimension. The proposed beamforming solution is employed in a Multiple-Input Low Noise Block Downconverter (MLNB) based Feed Array Reflector (FAR) in contrast to the widely used Uniform Linear Array (ULA) structure. Within the employed antenna structure, the performance of the proposed beamforming solution is evaluated considering different feed arrangements. Finally, a database-assisted approach and two blind approaches are suggested for the effective implementation of the proposed solutions. [less ▲]

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See detail3D Crack Detection Using an XFEM Variant and Global Optimization Algorithms
Agathos, Konstantinos UL; Chatzi, Eleni; Bordas, Stéphane UL

Scientific Conference (2016, May)

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See detail3D DEM – FEM Coupling to Analyse the Tractive Performance of Different Tire Treads in Soil
Michael, Mark UL; Peters, Bernhard UL

in Idelsohn, S; Papadrakakis, M; Schrefler, B (Eds.) Computational Methods for Coupled Problems in Science and Engineering V (2013, June)

This contribution investigates the tractive performance of different tire treads on granular terrain by an efficient combination of the Discrete Element Method (DEM) and the Finite Element Method (FEM ... [more ▼]

This contribution investigates the tractive performance of different tire treads on granular terrain by an efficient combination of the Discrete Element Method (DEM) and the Finite Element Method (FEM). The proposed coupling method has been shown to be a sufficient technique when resolving the different length scales involved in engineering problems dealing with granular assemblies in contact with deformable bodies [1][2]. Herein, the extended discrete element method (XDEM) is used to describe the dynamics of the granular assembly. Thereby the discrete approach accounts for the motion and forces of each grain individually. On the other hand, the finite element method accurately predicts the deformations and stresses acting within the tire tread. Hence, the simulation domain occupied by the tire is efficiently described as a continuous entity. The coupling of both method is based on the interface shared by the two spatially separated domains. The interface coupling enables to apply a contact model fitting the particular contact behaviour between the grains and the tread surface. Thus, contact forces develop at the interface and propagate into each domain. The coupling method enables to capture both responses simultaneously. Each grain in contact with the tread surface generates a contact force which it reacts on repulsively. The contact forces sum up over the surface and cause the tire tread to deform. The resultant stresses are then again recognised by the granular assembly. The coupling method compensates quite naturally the shortages of both numerical methods. It further employs a fast contact detection algorithm to spare valuable computation time [1]. The proposed DEM-FEM Coupling technique was employed to study the tractive performance of four different tire treads on a soil layer of the material sand. The simulations were conducted in accordance to the experimental measurements undertaken by Shinone et al. [3]. The contact forces at the surface of smooth, lug, rib and block tread patterns are captured by 3D simulations of different slip values of each tire tread. The simulation results are used to analyse the gross tractive effort, running resistance and drawbar pull of the different tread patterns in sand. [less ▲]

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See detail3D fatigue fracture modeling by isogeometric boundary element methods
Peng, Xuan; Atroshchenko, Elena; Kerfriden, Pierre et al

Scientific Conference (2016, April 01)

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See detail3D Mixed Invariant and its Application on Object Classification
Feng, Shuo; Aouada, Djamila UL; Krim, Hamid et al

in IEEE International Conference on Acoustics, Speech and Signal Processing, 2007. ICASSP 2007 (2007, April)

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See detail3D Modellierung von Festbettreaktoren mit Hilfe der XDEM
Hoffmann, Florian UL

Presentation (2013, July 05)

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See detail3D Modelling of bored tunnels
Van Baars, Stefan UL

in Brinkgreve (Ed.) Proc. Int. Symposium Beyond 2000 in Computational Geotechnics (1999)

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See detail3D object following based on visual information for Unmanned Aerial Vehicles
Mondragón, I. F.; Campoy, P.; Olivares Mendez, Miguel Angel UL et al

in Robotics Symposium, 2011 IEEE IX Latin American and IEEE Colombian Conference on Automatic Control and Industry Applications (LARC) (2011)

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See detail3D Object Recognition Using Fully Intrinsic Skeletal Graphs
Aouada, Djamila UL; Krim, Hamid

in International Conference on Computational Imaging, 2008 (2008, February)

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See detail3D pose estimation based on planar object tracking for UAVs control
Mondragon, Ivan F.; Campoy, Pascual; Martinez, Carol et al

in Proccedings of IEEE International Conference on Robotics and Automation (ICRA) (2010)

This article presents a real time Unmanned Aerial Vehicles UAVs 3D pose estimation method using planar object tracking, in order to be used on the control system of a UAV. The method explodes the rich ... [more ▼]

This article presents a real time Unmanned Aerial Vehicles UAVs 3D pose estimation method using planar object tracking, in order to be used on the control system of a UAV. The method explodes the rich information obtained by a projective transformation of planar objects on a calibrated camera. The algorithm obtains the metric and projective components of a reference object (landmark or helipad) with respect to the UAV camera coordinate system, using a robust real time object tracking based on homographies. The algorithm is validated on real flights that compare the estimated data against that obtained by the inertial measurement unit IMU, showing that the proposed method robustly estimates the helicopter's 3D position with respect to a reference landmark, with a high quality on the position and orientation estimation when the aircraft is flying at low altitudes, a situation in which the GPS information is often inaccurate. The obtained results indicate that the proposed algorithm is suitable for complex control tasks, such as autonomous landing, accurate low altitude positioning and dropping of payloads. [less ▲]

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