Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
See detailMulti-aperture imaging of extrasolar planetary systems (invited review)
Absil, Olivier ULg

Scientific conference (2009, September 14)

Space‐based nulling interferometry has been identified since 1978 as a promising technique to detect and characterize extrasolar Earth‐like planets. In this talk, I will review the evolution of the ... [more ▼]

Space‐based nulling interferometry has been identified since 1978 as a promising technique to detect and characterize extrasolar Earth‐like planets. In this talk, I will review the evolution of the multi‐aperture concepts dedicated to Earth‐like planet imaging during the last 30 years, and discuss the future prospects in this field. In particular, I will describe the proposed architecture for the Darwin/TPF‐I mission, which has resulted from a common optimization effort by ESA and NASA and from various industrial studies during the past decade. The main scientific and technical hard points will be critically discussed. This talk will also review the precursor instruments (present and future) that could enable future flagship interferometric missions similar to Darwin/TPF‐I. [less ▲]

Detailed reference viewed: 9 (0 ULg)
Full Text
Peer Reviewed
See detailA multi-approach survey as the most reliable tool to accurately assess biodiversity: the example of Thai murine rodents
Chaval, Yannick; Dobigny, Gauthier; Michaux, Johan ULg et al

in Kasetsart Journal. Natural Sciences (2010), 44(4), 590-603

Wildlife surveys rely on an accurate taxonomic framework. Identification tools used to reach this goal are not equivalent and may depend on several objectives and constraints, including sampling ... [more ▼]

Wildlife surveys rely on an accurate taxonomic framework. Identification tools used to reach this goal are not equivalent and may depend on several objectives and constraints, including sampling conservation difficulties, the invasiveness of the sampling techniques, sampling capacity, the relevance of the results, materials needed, the cost and the user time required in the field and laboratory. This article presents and discusses the advantages and limits of each identification tool used in the Ceropath (Community ecology of rodents and their pathogens in South East Asia) program to reach a fast and relevant identification of the rodents sampled. It is concluded that there needs to be a combination of the results from different methods, including the most recent ones, to achieve an improvement in taxonomic identification. [less ▲]

Detailed reference viewed: 18 (1 ULg)
Full Text
Peer Reviewed
See detailMulti-area security assessment: results using efficient bounding method
Wehenkel, Louis ULg; Glavic, Mevludin; Ernst, Damien ULg

in Proceedings of the 38th North American Power Symposium (NAPS 2006) (2006)

We present our recent results on using previously introduced framework for multi-area security assessment in large interconnections. The basic idea of the framework is exchanging just enough information ... [more ▼]

We present our recent results on using previously introduced framework for multi-area security assessment in large interconnections. The basic idea of the framework is exchanging just enough information so that each operator can evaluate the impact in his control area of contingencies both internal and external to his area. We provide illustrations based on a localization concept known as efficient bounding method and recently introduced approximate DC model of the European interconnected system. In this paper we focus on four transmission system operators (within the approximate DC model): Belgium, France, Germany, and Netherlands (for both Summer and Winter-peak load conditions). [less ▲]

Detailed reference viewed: 23 (3 ULg)
Full Text
Peer Reviewed
See detailMulti-armed bandit based policies for cognitive radio's decision making issues
Jouini, Wassim; Ernst, Damien ULg; Moy, Christophe et al

in Proceedings of the 3rd International Conference on Signals, Circuits and Systems (SCS) (2009, November)

We suggest in this paper that many problems related to Cognitive Radio’s (CR) decision making inside CR equipments can be formalized as Multi-Armed Bandit problems and that solving such problems by using ... [more ▼]

We suggest in this paper that many problems related to Cognitive Radio’s (CR) decision making inside CR equipments can be formalized as Multi-Armed Bandit problems and that solving such problems by using Upper Confidence Bound (UCB) algorithms can lead to high-performance CR devices. An application of these algorithms to an academic Cognitive Radio problem is reported. [less ▲]

Detailed reference viewed: 110 (15 ULg)
See detailMulti-aspects architectural design: the conception of new building envelopes
Dupagne, Albert ULg; Hauglustaine, Jean-Marie ULg

Conference (1999, October)

The building is not a unique object any more, but results from the assembly of components, among which the envelope is one of the objects assembled. The components are more and more specialised and ... [more ▼]

The building is not a unique object any more, but results from the assembly of components, among which the envelope is one of the objects assembled. The components are more and more specialised and acquire an actual independence. On the other hand, the components of the building and of the envelope have a large diversity of life cycles; moreover the life duration of the components shortens, because they rapidly become obsolescent from many points of view: technology, technique, performance, functionality, etc., so that their easy transformability, adaptability (and/or removability) becomes an important quality required to them. The conception of new building envelopes must take these aspects into account, in order to obtain a best practice design. [less ▲]

Detailed reference viewed: 59 (1 ULg)
Full Text
See detailMulti-axial integrated optics solution for POPS, a 2nd-generation VLTI fringe tracker
Tarmoul, Nassima; Hénault, François; Mourard, Denis et al

in Danchi, W. C.; Delplancke, F.; Rajagopal, J. K. (Eds.) Optical and Infrared Interferometry II (2010, July)

POPS (Planar Optical Phase Sensor) is a second-generation fringe tracker for the Very Large Telescope Interferometer (VLTI), intended to simultaneously measure the cophasing and coherencing errors of up ... [more ▼]

POPS (Planar Optical Phase Sensor) is a second-generation fringe tracker for the Very Large Telescope Interferometer (VLTI), intended to simultaneously measure the cophasing and coherencing errors of up to six Unit Telescopes (UT) or Auxiliary Telescopes (AT) in real time. The most promising concepts are probably based on the utilization of Integrated Optics (IO) components, and were the scope of a Phase A study led by Observatoire de Grenoble (LAOG). Herein is described a tentative design built around a multi-axial IO chip whose fringes are dispersed downstream on a detector array, and a Chromatic Phase Diversity algorithm presented in another paper of this conference . We depict the foreseen opto-mechanical, detection and software implementations, and provide numerical results from a realistic simulation model in terms of group and phase delay measurement accuracy and limiting magnitudes in the K band. The ultimate performance of the method is discussed and compared with the original 2[SUP]nd[/SUP] generation VLTI fringe tracker requirements. [less ▲]

Detailed reference viewed: 51 (1 ULg)
Peer Reviewed
See detailMulti-biomaterial for controlled release of active substances
Zalfen, Alina; Nizet, Dominique; Jérôme, Christine ULg et al

Poster (2006)

Detailed reference viewed: 15 (0 ULg)
Peer Reviewed
See detailMulti-Camera People Tracking by Collaborative Particle Filters and Principal Axis-Based Integration
Du, Wei ULg; Piater, Justus ULg

in Asian Conference on Computer Vision (2007)

Detailed reference viewed: 21 (0 ULg)
Full Text
Peer Reviewed
See detailA multi-centre clinico-genetic analysis of the VPS35 gene in Parkinson disease indicates reduced penetrance for disease-associated variants.
Sharma, Manu; Ioannidis, John P. A.; Aasly, Jan O. et al

in Journal of Medical Genetics (2012), 49(11), 721-6

BACKGROUND: Two recent studies identified a mutation (p.Asp620Asn) in the vacuolar protein sorting 35 gene as a cause for an autosomal dominant form of Parkinson disease . Although additional missense ... [more ▼]

BACKGROUND: Two recent studies identified a mutation (p.Asp620Asn) in the vacuolar protein sorting 35 gene as a cause for an autosomal dominant form of Parkinson disease . Although additional missense variants were described, their pathogenic role yet remains inconclusive. METHODS AND RESULTS: We performed the largest multi-center study to ascertain the frequency and pathogenicity of the reported vacuolar protein sorting 35 gene variants in more than 15,000 individuals worldwide. p.Asp620Asn was detected in 5 familial and 2 sporadic PD cases and not in healthy controls, p.Leu774Met in 6 cases and 1 control, p.Gly51Ser in 3 cases and 2 controls. Overall analyses did not reveal any significant increased risk for p.Leu774Met and p.Gly51Ser in our cohort. CONCLUSIONS: Our study apart from identifying the p.Asp620Asn variant in familial cases also identified it in idiopathic Parkinson disease cases, and thus provides genetic evidence for a role of p.Asp620Asn in Parkinson disease in different populations worldwide. [less ▲]

Detailed reference viewed: 20 (6 ULg)
Full Text
Peer Reviewed
See detailMulti-Chromatic Analysis of SAR Images for Coherent Target Detection
Bovenga, Fabio; Barbier, Christian ULg; De Rauw, Dominique ULg et al

in Remote Sensing (2014), 6

This work investigates the possibility of performing target analysis through the Multi-Chromatic Analysis (MCA), a technique that basically explores the information content of sub-band images obtained by ... [more ▼]

This work investigates the possibility of performing target analysis through the Multi-Chromatic Analysis (MCA), a technique that basically explores the information content of sub-band images obtained by processing portions of the range spectrum of a synthetic aperture radar (SAR) image. According to the behavior of the SAR signal at the different sub-bands, MCA allows target classification. Two strategies have been experimented by processing TerraSAR-X images acquired over the Venice Lagoon, Italy: one exploiting the phase of interferometric sub-band pairs, the other using the spectral coherence derived by computing the coherence between sub-band images of a single SAR acquisition. The first approach introduces the concept of frequency-persistent scatterers (FPS), which is complementary to that of the time-persistent scatterers (PS). FPS and PS populations have been derived and analyzed to evaluate the respective characteristics and the physical nature of the targets. Spectral coherence analysis has been applied to vessel detection, according to the property that, in presence of a random distribution of surface scatterers, as for open sea surfaces, spectral coherence is expected to be proportional to sub-band intersection, while in presence of manmade structures it is preserved anyhow. First results show that spectral coherence is well preserved even for very small vessels, and can be used as a complementary information channel to constrain vessel detection in addition to classical Constant False Alarm Rate techniques based on the sole intensity channel. [less ▲]

Detailed reference viewed: 59 (9 ULg)
Full Text
See detailMulti-Cité, une expérience de formation initiale inédite
Beckers, Jacqueline ULg; Stegen, Pierre; Merenne-Schoumaker, Bernadette ULg et al

in Puzzle (1997), 2(juin), 10-16

L'article présente l'expérience de formation co-jointe de futurs professeurs de géographie de l'ULg et de la Haute Ecole Charlemagne via la réalisation d'un jeu pédagogique portant sur la gestion urbaine ... [more ▼]

L'article présente l'expérience de formation co-jointe de futurs professeurs de géographie de l'ULg et de la Haute Ecole Charlemagne via la réalisation d'un jeu pédagogique portant sur la gestion urbaine, jeu publié dans GEO 41. [less ▲]

Detailed reference viewed: 36 (12 ULg)
See detailMulti-city network on drug mesure trends
Honore, A.; Amraei, M.; Bils, L. et al

Report (1999)

Detailed reference viewed: 7 (0 ULg)
Full Text
Peer Reviewed
See detailMulti-Criteria Decision Support for Cost Assessment Techniques in Shipbuilding Industry
Caprace, Jean-David ULg; Rigo, Philippe ULg

in COMPIT'09, Budapest (2009, May 10)

Cost is perhaps the most influential factor in the outcome of a product or service within many of today’s industries. Cost assessment during the early stage of ship design is crucial. It influences the go ... [more ▼]

Cost is perhaps the most influential factor in the outcome of a product or service within many of today’s industries. Cost assessment during the early stage of ship design is crucial. It influences the go, no-go decision concerning a new development. Cost assessment occurs at various stages of ship design development. Economic evaluation as early as possible, in the design phase, is therefore crucial to find the best price–function compromise for the ship projects. This paper presents a Multi Criteria Decision Aid (MCDA) method in order to select an appropriate cost assessment method at each stage of the ship design. In order to compare the cost performance between all alternatives, the evaluation of each alternative is performed by PROMETHEE. [less ▲]

Detailed reference viewed: 120 (7 ULg)
Full Text
Peer Reviewed
See detailMulti-criteria Scantling Optimisation of Cruise Ships
Caprace, Jean-David ULg; Bair, Frédéric ULg; Rigo, Philippe ULg

in Ship Technology Research = Schiffstechnik (2010), 20

A numerical tool for the optimisation of the scantlings of a ship is extended by considering production cost, weight and moment of iner tia in the objective function. A multi-criteria optimisation of a ... [more ▼]

A numerical tool for the optimisation of the scantlings of a ship is extended by considering production cost, weight and moment of iner tia in the objective function. A multi-criteria optimisation of a passenger ship is conducted to illustrate the analysis process. Pareto frontiers are obtained and results are verified with Bureau Veritas rules. [less ▲]

Detailed reference viewed: 266 (25 ULg)
Full Text
Peer Reviewed
See detailMulti-Criteria Selection of Hydraulic Gates
Daniel, R.; Dembick, E.; Rigo, Philippe ULg

in International Navigation Seminar, PIANC AGA2008, Beijing, China Communication Press (CIP), Beijing, China, May 2008 (2008, May)

Detailed reference viewed: 47 (0 ULg)
Full Text
Peer Reviewed
See detailMulti-criterion Scantling Optimisation of Passenger Ships
Caprace, Jean-David ULg; Bair, Frédéric ULg; Rigo, Philippe ULg

in 9th International Conference on Computer Applications and Information Technology in the Maritime Industries (2010, April 12)

In the scantling design of a passenger ship, minimum production cost, minimum weight and maximum moment of inertia (stiffness) are conflicting objectives. For that purpose, recent improvements were made ... [more ▼]

In the scantling design of a passenger ship, minimum production cost, minimum weight and maximum moment of inertia (stiffness) are conflicting objectives. For that purpose, recent improvements were made to the LBR-5 software (French acronym of “Stiffened Panels Software”, version 5.0) to optimize the scantling of ship sections by considering production cost, weight and moment of inertia in the optimisation objective function. A real multi-criterion optimisation of a passenger ship is presented in this paper. Results highlight that LBR-5 is competitive software to optimise scantling of ships at very early design stage with management of critical problems studied normally at a later step of the design. [less ▲]

Detailed reference viewed: 88 (10 ULg)
Full Text
Peer Reviewed
See detailMulti-decadal carbon and water relations of African tropical humid forests: a tree-ring stable isotope analysis
Hufkens, Koen; Helle, Gerd; de Haulleville, Thalès ULg et al

Conference (2013, April 10)

Little is known about the temporal dynamics of the carbon sequestering capacity and dynamics of African tropical humid forest ecosystems in response to various environmental drivers. This lack of ... [more ▼]

Little is known about the temporal dynamics of the carbon sequestering capacity and dynamics of African tropical humid forest ecosystems in response to various environmental drivers. This lack of knowledge is mainly due to the absence of ecosystem scale flux measurements of gas exchange. However, tree growth often displays itself as alternating pattern of visible rings due to the seasonally varying growth speed of the vascular cambium. Consequently, analysis of tree growth through tree-ring analysis provides us with insights into past responses of the carbon sequestering capacity of key species to abrupt ecosystem disturbances and, while slower, a changing climate. Not only does the width and density of growth rings reflect annual growth but their isotopic composition of 13C/12C and 18O/16O isotopes also reveal the environmental conditions in which the trees were growing. In particular, stable isotope ratios in tree-rings of carbon are influenced by fractionation through carboxylation during photosynthesis and changes in leaf stomatal conductance. Similarly, fractionation of oxygen isotopes of soil water occurs at the leaf level through evapo-transipiration. As a consequence, 18O/16O (δ 18O) values in wood cores will reflect both the signal of the source water as well as that of for example summer humidity. Therefore, both C and O stable isotopes might not only be valuable as proxy data for past climatic conditions but they also serve as an important tool in understanding carbon and water relations within a tropical forest ecosystems. To this end we correlate long term climate records (1961 – present) with tree ring measurement of incremental growth and high resolution analysis of tree-core stable isotope composition(δ 13C , δ 18O) at a tropical humid forests in the DR Congo. The Yangambi Man And Biosphere (MAB) reserve is located in the north-eastern part of DR Congo, with a distinct tropical rainforest climate. In addition to the tree-core data records and extensive meteorological records collected at both sites, observations on green leaf phenology of key species will provide us with additional information on potential carbon sequestration dynamics. Because, phenology is a first order control on plant productivity. In this unique study, using detailed tree-ring analyses together with auxiliary data, we explore the temporal dynamics of carbon and water relations and the influence on carbon sequestration of key tree species in African tropical humid forests. [less ▲]

Detailed reference viewed: 11 (0 ULg)
Peer Reviewed
See detailMulti-dectector row computed tomography of the carpal joint in dogs
Cavrenne; Bolen, Géraldine ULg; DeBusscher et al

Poster (2007)

Detailed reference viewed: 7 (1 ULg)
Full Text
Peer Reviewed
See detailMulti-dimensional sets recognizable in all abstract numeration systems
Charlier, Emilie ULg; Lacroix, Anne ULg; Rampersad, Narad ULg

in RAIRO : Informatique Théorique et Applications = Theoretical Informatics and Applications (2012), 46(1), 51-65

We prove that the subsets of N^d that are S-recognizable for all abstract numeration systems S are exactly the 1-recognizable sets. This generalizes a result of Lecomte and Rigo in the one-dimensional ... [more ▼]

We prove that the subsets of N^d that are S-recognizable for all abstract numeration systems S are exactly the 1-recognizable sets. This generalizes a result of Lecomte and Rigo in the one-dimensional setting. [less ▲]

Detailed reference viewed: 108 (25 ULg)