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See detailCoverage Extension via Side-Lobe Transmission in Multibeam Satellite System
Gharanjik, Ahmad UL; Kmieciak, Jarek; Shankar, Bhavani UL et al

in 23rd Ka and Broadband Communications Conference (2017, October 16)

In this paper, we study feasibility of coverage extension of a multibeam satellite network by providing low-rate communications to terminals located outside the coverage of main beams. Focusing on the MEO ... [more ▼]

In this paper, we study feasibility of coverage extension of a multibeam satellite network by providing low-rate communications to terminals located outside the coverage of main beams. Focusing on the MEO satellite network, and using realistic link budgets from O3b networks, we investigate the performance of both forward and return-links for terminals stationed in the side lobes of the main beams. Particularly, multi-carrier transmission for forward-link and single carrier transmission for return-link are examined and the resulting coverage and data rate for different setups are evaluated. Simulation results verifies that side-lobe transmission can extend the coverage area and provide considerable data rate, thereby providing a solution for enhancing capacity of existing networks. [less ▲]

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See detailCoverage optimization with connectivity preservation for UAV swarms applying chaotic dynamics
Rosalie, Martin UL; Brust, Matthias R. UL; Danoy, Grégoire UL et al

in IEEE International Conference on Autonomic Computing (ICAC), Columbus 17-21 July 2017 (2017, August 11)

Cooperative usage of multiple UAVs as a swarm can deliver high-quality surveillance performance. However, the communication capabilities within the UAV swarm must be maintained for local data propagation ... [more ▼]

Cooperative usage of multiple UAVs as a swarm can deliver high-quality surveillance performance. However, the communication capabilities within the UAV swarm must be maintained for local data propagation to swarm members in favor of achieving an efficient global behavior. In this paper, we address the problem of optimizing two adversary criteria for such a UAV swarm: (a) maximizing the area coverage, while (b) preserving network connectivity. Our approach, called CACOC², solves the problem with a novel chaotic ant colony optimization approach, which combines an Ant Colony Optimization approach (ACO) with a chaotic dynamical system. CACOC² employs swarming behavior to obtain UAV clustering that result in maximized area coverage and preserved network connectivity. We show by extensive simulations how the size of the UAV swarm influences the coverage and connectivity. A metrics comparison chart shows the correlation of coverage and connectivity metrics. [less ▲]

Detailed reference viewed: 161 (29 UL)
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See detailCoverage-based regression test case selection, minimization and prioritization: a case study on an industrial system
Di Nardo, Daniel UL; Alshahwan, Nadia; Briand, Lionel UL et al

in Software Testing, Verification & Reliability (2015), 25(4), 371-396

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See detailCoverage-Based Test Case Prioritisation: An Industrial Case Study
Di Nardo, Daniel UL; Alshahwan, Nadia UL; Briand, Lionel UL et al

in IEEE International Conference on Software Testing, Verification and Validation (ICST) (2013, March)

Detailed reference viewed: 273 (25 UL)
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See detailCoverage-based Test Cases Selection for XACML Policies
Bertolino, Antonia; Le Traon, Yves UL; Lonetti, Francesca et al

in IEEE International Conference on Software Testing Verification and Validation Workshops (2014)

XACML is the de facto standard for implementing access control policies. Testing the correctness of policies is a critical task. The test of XACML policies involves running requests and checking manually ... [more ▼]

XACML is the de facto standard for implementing access control policies. Testing the correctness of policies is a critical task. The test of XACML policies involves running requests and checking manually the correct response. It is therefore important to reduce the manual test effort by automatically selecting the most important requests to be tested. This paper introduces the XACML smart coverage selection approach, based on a proposed XACML policy coverage criterion. The approach is evaluated using mutation analysis and is compared on the one side with a not-reduced test suite, on the other with random and greedy optimal test selection approaches. We performed the evaluation on a set of six real world policies. The results show that our selection approach can reach good mutation scores, while significantly reducing the number of tests to be run. [less ▲]

Detailed reference viewed: 101 (1 UL)
See detailCovering Different Levels of Evaluation Needs by an Internet-Based Computer-Assisted Testing Framework for Collaborative Distributed Test Development and Delivery
Martin, Romain UL; Latour, T.; Burton, Réginald UL et al

in Proceedings of World Conference on Educational Multimedia, Hypermedia and Telecommunications (2005)

Detailed reference viewed: 66 (0 UL)
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See detailCovid-19 : « And the world went digital… »
Sorlut, Pierre; Derian, Maxime UL

in D'Lëtzebuerger Land (2020)

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See detailCovid-19 and labour law in Luxembourg
Ratti, Luca UL

in European Labour Law Journal (2020)

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See detailCPAL: High-Level Abstractions for Safe Embedded Systems
Navet, Nicolas UL; Fejoz, Loïc

in DSM 2016: Proceedings of the International Workshop on Domain-Specific Modeling (2016)

Innovation in the field of embedded systems, and more broadly in cyber-physical systems, increasingly relies on software. The productivity gain in software development can hardly keep up with the demand ... [more ▼]

Innovation in the field of embedded systems, and more broadly in cyber-physical systems, increasingly relies on software. The productivity gain in software development can hardly keep up with the demand for software despite the increasing adoption of Model-Driven Development (MDD). In this context, we believe that major productivity and quality improvements are still ahead of us through better programming languages and environments. CPAL, the Cyber-Physical Action Language, is a contribution in that direction with the objective to speed-up the development of embedded systems with dependability constraints. The objective of this paper is to present and illustrate the use-cases of the high-level abstractions offered to the developer in CPAL with respect to real-time scheduling, introspection mechanisms, native support of Finite State Machines (FSMs), abstracting the hardware and decoupling functional concerns from non-functional concerns. [less ▲]

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See detailCPDY: Extending the Dolev-Yao Attacker with Physical-Layer Interactions
Rocchetto, Marco UL; Tippenhauer, Nils

in CPDY: Extending the Dolev-Yao Attacker with Physical-Layer Interactions (2016)

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See detailCPU-Based Real-Time Surface and Solid Voxelization for Incomplete Point Cloud
Garcia Becerro, Frederic UL; Ottersten, Björn UL

in 22nd International Conference on Pattern Recognition (2014, August 27)

This paper presents a surface and solid voxelization approach for incomplete point cloud datasets. Voxelization stands for a discrete approximation of 3-D objects into a volumetric representation, a ... [more ▼]

This paper presents a surface and solid voxelization approach for incomplete point cloud datasets. Voxelization stands for a discrete approximation of 3-D objects into a volumetric representation, a process which is commonly employed in computer graphics and increasingly being used in computer vision. In contrast to surface voxelization, solid voxelization not only set those voxels related to the object surface but also those voxels considered to be inside the object. To that end, we first approximate the given point set, usually describing the external object surface, to an axis-aligned voxel grid. Then, we slice-wise construct a shell containing all surface voxels along each grid-axis pair. Finally, voxels inside the constructed shell are set. Solid voxelization results from the combination of all slices, resulting in a watertight and gap-free representation of the object. The experimental results show a high performance when voxelizing point cloud datasets, independently of the object’s complexity, robust to noise, and handling large portions of data missing. [less ▲]

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See detailCPU-based real-time surface and solid voxelization for incomplete point cloud
Garcia, Frederic D.; Ottersten, Björn UL

in Proceedings of the 22nd International Conference on Pattern Recognition (2014)

This paper presents a surface and solid voxelization approach for incomplete point cloud datasets. Voxelization stands for a discrete approximation of 3-D objects into a volumetric representation, a ... [more ▼]

This paper presents a surface and solid voxelization approach for incomplete point cloud datasets. Voxelization stands for a discrete approximation of 3-D objects into a volumetric representation, a process which is commonly employed in computer graphics and increasingly being used in computer vision. In contrast to surface voxelization, solid voxelization not only set those voxels related to the object surface but also those voxels considered to be inside the object. To that end, we first approximate the given point set, usually describing the external object surface, to an axis-aligned voxel grid. Then, we slice-wise construct a shell containing all surface voxels along each grid-axis pair. Finally, voxels inside the constructed shell are set. Solid voxelization results from the combination of all slices, resulting in a watertight and gap-free representation of the object. The experimental results show a high performance when voxelizing point cloud datasets, independently of the object's complexity, robust to noise, and handling large portions of data missing. © 2014 IEEE. [less ▲]

Detailed reference viewed: 136 (0 UL)
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See detailCRABP and the teratogenic effects of retinoids
Balling, Rudi UL

in Trends in Genetics (1991), (7), 279-287

Detailed reference viewed: 82 (1 UL)
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See detailCrack growth analysis by a NURBS-based isogeometric boundary element method
Peng, Xuan; Atroshchenko, Elena; Simpson, Robert et al

Scientific Conference (2014, July)

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See detailCrack growth analysis by a NURBS-based isogeometric boundary element metyhod
Peng, Xuan; Atroshchenko, Elena; Simpson, Robert et al

Presentation (2014, July)

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See detailCrack growth calculations in solder joints based on microstructural phenomena with X-FEM
Menk, Alexander; Bordas, Stéphane UL

in Computational Materials Science (2011), 50(3), 1145-1156

Determining the lifetime of solder joints subjected to thermomechanical loads is crucial to guarantee the quality of electronic devices. The fatigue process is heavily dependent on the microstructure of ... [more ▼]

Determining the lifetime of solder joints subjected to thermomechanical loads is crucial to guarantee the quality of electronic devices. The fatigue process is heavily dependent on the microstructure of the joints. We present a new methodology to determine the lifetime of the joints based on microstructural phenomena. Random microstructures are generated to capture the statistical variety of possible microstructures and crack growth calculations are performed. The extended finite element method is used to solve the structural problem numerically which allows a complete automation of the process. Numerical examples are given and compared to experimental data. [less ▲]

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See detailCrack nucleation and propagation in highly heterogeneous materials models obtained from microtomography images using phase field method
Nguyen, Thanh Tung UL; Yvonnet, Julien; Zhu, Q. Z. et al

in 11th World Congress on Computational Mechanics (2014)

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See detailCrack nucleation and propagation in highly heterogeneous microstructure models based on X-ray CT images of real materials
Nguyen, Thanh Tung UL; Yvonnet, Julien; Zhu, Qizhi et al

in 12e Colloque national en calcul des structures (2015)

Detailed reference viewed: 12 (0 UL)