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See detailMerging multi-camera data to reduce motion analysis instrumental errors using Kalman filters
Schwartz, Cédric ULg; Denoël, Vincent ULg; Forthomme, Bénédicte ULg et al

in Computer Methods in Biomechanics and Biomedical Engineering (2015), 18(9), 952-960

In motion capture systems, markers are often seen by multiple cameras. All cameras do not measure the position of the markers with the same reliability because of environmental factors such as the ... [more ▼]

In motion capture systems, markers are often seen by multiple cameras. All cameras do not measure the position of the markers with the same reliability because of environmental factors such as the position of the marker in the field of view or the light intensity received by the cameras. Kalman filters offer a general framework to take the reliability of the various cameras into account and consequently improve the estimation of the marker position. The proposed process can be applied to both passive and active systems. Several reliability models of the cameras are compared for the Codamotion active system, which is considered as a specific illustration. The proposed method significantly reduces the noise in the signal, especially at long range distances. Therefore, it improves the confidence of the positions at the limits of the field of view. [less ▲]

Detailed reference viewed: 108 (40 ULg)
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See detailMerging of spectral datasets from different MIR instruments used in the routine analysis of milk
Fernandez Pierna, Juan; Grelet, Clément ULg; Dehareng, Frédéric et al

Conference (2012)

Detailed reference viewed: 14 (3 ULg)
Peer Reviewed
See detailMerging satellite and in situ sea surface temperature data using DINEOF
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Beckers, Jean-Marie ULg

Conference (2011, April 05)

High quality sea surface temperature data sets are needed for various applications, including numerical weather prediction, ocean forecasting and climate research. The coverage, resolution and precision ... [more ▼]

High quality sea surface temperature data sets are needed for various applications, including numerical weather prediction, ocean forecasting and climate research. The coverage, resolution and precision of individual sea surface temperature observations is not sufficient for these applications, therefore merging of complementary data sets is needed to increase the coverage and to reduce the final data set error. DINEOF (Data Interpolating Empirical Orthogonal Functions) is an EOF-based technique to reconstruct missing information -due to clouds, for example in satellite data sets. A new development of this method consists in its capability to merge different data sources into one estimate. This development is tested using AVHRR data of the western Mediterranean Sea and in situ data from various international databases (World Ocean Database (WOD), MEDAR/Medatlas, Coriolis Data Center, International Council for the Exploration of the Sea (ICES) and International Comprehensive Ocean-Atmosphere Data Set (ICOADS)). An error assessment between the satellite and in situ data is performed first, in order to determine the error statistics between these two data sources. The error is calculated by database, platform type (CTD, XBT, drifters, bottles and ships) and depth. This error assessment is used to merge the in situ and satellite data. The impact of the sensor-specific errors on the quality of the final product will be assessed, and compared to the results obtained when the same error estimate is used for all sensors. The benefit of using in situ data in addition to satellite data will be also discussed. Additional information can be found at http://modb.oce.ulg.ac.be/mediawiki/index.php/DINEOF and http://gherdiva.phys.ulg.ac.be/DINEOF/ [less ▲]

Detailed reference viewed: 63 (1 ULg)
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See detailMerging supercritical carbon dioxide and organocatalysis for the precision and green synthesis of poly(lactide)-based (co)polymers
Grignard, Bruno ULg; De Winter, Julien; Gerbaux, Pascal et al

in European Polymer Journal (in press)

Well-defined poly(lactide)-based block copolymers were synthesized by a heterogeneous solvent and metal-free green approach by using organocatalysts in supercritical carbon dioxide (scCO2). We first ... [more ▼]

Well-defined poly(lactide)-based block copolymers were synthesized by a heterogeneous solvent and metal-free green approach by using organocatalysts in supercritical carbon dioxide (scCO2). We first report on the homopolymerization of both L- and D,L- lactide by organocatalyzed Ring-Opening Polymerization (o-ROP) by using a bicomponent organocatalyst composed of a thiourea derivative and various tertiary amines as cocatalysts. Control over the molar mass and dispersity is achieved until high monomer conversion although the polylactides are insoluble in the polymerization medium. The precision synthesis of PLA-based block copolymers from various CO2-phobic hydroxyl end-capped macroinitiators such as polyethylene glycol, polycaprolactone, polybutylene succinate and polyphosphoester was then reported. Merging scCO2 with this organocatalytic system provides therefore a unique tool for the design under solvent-free conditions of poly(lactide)-based block copolymers that are insoluble in scCO2. [less ▲]

Detailed reference viewed: 17 (3 ULg)
See detailMeridional reorganizations of marine and terrestrial productivity during Heinrich events
Menviel, L.; Timmermann, Anne-Marie ULg; Mouchet, Anne ULg et al

Conference (2007, December)

To study the response of the global carbon cycle to a weakening of the Atlantic Meridional Overturning Circulation (AMOC) a series of freshwater perturbation experiments is conducted both, under pre ... [more ▼]

To study the response of the global carbon cycle to a weakening of the Atlantic Meridional Overturning Circulation (AMOC) a series of freshwater perturbation experiments is conducted both, under pre-industrial and glacial conditions using the earth system model of intermediate complexity LOVECLIM. A shutdown of the AMOC leads to substantial cooling of the North Atlantic, a weak warming of the southern hemisphere, intensification of the northeasterly trade winds and a southward shift of the Intertropical Convergence Zone (ITCZ). Trade wind anomalies change upwelling in the tropical oceans and hence marine productivity. Furthermore, hydrological changes associated with a southward displacement of the ITCZ, lead to a reduction of terrestrial carbon stocks mainly in northern Africa and northern South America, in agreement with paleo-proxy data. In the freshwater perturbation experiments, the ocean acts as a sink of CO2, primarily through increased solubility. The net atmospheric CO2 anomaly induced by a shutdown of the AMOC amounts to about +15 ppmv and --10 ppmv for pre-industrial and glacial conditions, respectively. This background state dependence can be explained by the fact that the glacial climate is drier and the terrestrial vegetation therefore releases a smaller amount of carbon to the atmosphere. This study demonstrates that the net CO2 response to large-scale ocean circulation changes has significant contributions both, from the terrestrial and marine carbon cycle. [less ▲]

Detailed reference viewed: 10 (1 ULg)
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See detailMeridional reorganizations of marine and terrestrial productivity during Heinrich events,
Menviel, L.; Timmermann, A.; Mouchet, Anne ULg et al

in Paleoceanography (2008), 23

To study the response of the global carbon cycle to a weakening of the Atlantic Meridional Overturning Circulation (AMOC), a series of freshwater perturbation experiments is conducted both under ... [more ▼]

To study the response of the global carbon cycle to a weakening of the Atlantic Meridional Overturning Circulation (AMOC), a series of freshwater perturbation experiments is conducted both under preindustrial and glacial conditions using the earth system model of intermediate complexity LOVECLIM. A shutdown of the AMOC leads to substantial cooling of the North Atlantic, a weak warming of the Southern Hemisphere, intensification of the northeasterly trade winds, and a southward shift of the Intertropical Convergence Zone (ITCZ). Trade wind anomalies change upwelling in the tropical oceans and hence marine productivity. Furthermore, hydrological changes associated with a southward displacement of the ITCZ lead to a reduction of terrestrial carbon stocks mainly in northern Africa and northern South America in agreement with paleoproxy data. In the freshwater perturbation experiments the ocean acts as a sink of CO2, primarily through increased solubility. The net atmospheric CO2 anomaly induced by a shutdown of the AMOC amounts to about +15 ppmv and −10 ppmv for preindustrial and glacial conditions, respectively. This background state dependence can be explained by the fact that the glacial climate is drier and the terrestrial vegetation therefore releases a smaller amount of carbon to the atmosphere. This study demonstrates that the net CO2 response to large-scale ocean circulation changes has significant contributions both from the terrestrial and marine carbon cycle. [less ▲]

Detailed reference viewed: 35 (0 ULg)
See detailLe merisier : état de la ressource en Belgique
Claessens, Hugues ULg

in Boulet-Gercourt, Bruno (Ed.) Le Merisier (1997)

Detailed reference viewed: 31 (11 ULg)
See detailMerisier : les variétés multiclonales ont-elles un avenir ?
Curnel, Yanick; van de waele, Isabelle; Jacques, Dominique et al

in Silva Belgica (2001), 108(2), 32-37

Detailed reference viewed: 31 (5 ULg)
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See detailMerits of the multivariate Dale model in genetic association studies
Van Steen, Kristel ULg; Molenberghs, G.; Tahri, N.

in Genetic Epidemiology (2002), 23

Detailed reference viewed: 5 (1 ULg)
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See detailMerleau-Ponty : l'ontologie à la lumière des signes
Caeymaex, Florence ULg

in Irene Borges-Duarte, Fernanda Henriques (Ed.) Heidegger, linguagem, traduçao (2004)

Detailed reference viewed: 23 (4 ULg)
See detailMerleau-Ponty : la beauté du monde
Steinmetz, Rudy ULg

in L'atelier d'esthétique (Ed.) Esthétique et philosophie de l'art (2002)

Detailed reference viewed: 30 (2 ULg)
Peer Reviewed
See detailMerleau-Ponty : peinture et vérité
Steinmetz, Rudy ULg

Conference (1998)

Detailed reference viewed: 14 (0 ULg)
See detailMerleau-Ponty : philosophie et peinture (l'approche de Cézanne)
Steinmetz, Rudy ULg

Conference given outside the academic context (2003)

Detailed reference viewed: 26 (0 ULg)
See detailMerleau-Ponty : philosophie et peinture (perception et expression)
Steinmetz, Rudy ULg

Conference given outside the academic context (2003)

Detailed reference viewed: 35 (4 ULg)
See detailMerleau-Ponty : philosophie et peinture (perception et participation)
Steinmetz, Rudy ULg

Conference given outside the academic context (2002)

Detailed reference viewed: 43 (1 ULg)
See detailThe Merlin and its Suite
Combes, Annie ULg

in Dover, Carol (Ed.) A Companion to the Lancelot-Grail-Cycle (2003)

Detailed reference viewed: 37 (6 ULg)
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See detailMERLIN: MEasure the Router Level of the INternet
Mérindol, Pascal; Donnet, Benoît ULg; Pansiot, Jean-Jacques, et al

in 7th Euro-NF Conference on Next Generation Internet (2011, June)

The Internet topology discovery has been an extensive research subject those last years. While the raw data is collected using large traceroute campaigns, additional probing and/or extensive computation ... [more ▼]

The Internet topology discovery has been an extensive research subject those last years. While the raw data is collected using large traceroute campaigns, additional probing and/or extensive computation are required to gather subsets of IP addresses into single identifiers cor- responding to routers. This process, known as alias reso- lution, leads to a router level map of the Internet. In this paper, we push further the Internet router level mapping with a new probing tool called MERLIN. MER- L I N is based on mrinfo, a multicast management tool. mrinfo is able to silently collect all IPv4 multicast en- abled interfaces of a router and all its multicast links to- wards its neighbors: it does not need or rely on any alias resolution mechanism. In addition, M E R L I N comes with the advantage of being much more scalable than standard data gathering techniques. In this paper, we deploy and evaluate the performance of MERLIN. We demonstrate that the use of several vantage points is crucial to circum- vent IGMP filtering in order to collect large amounts of routers. We also investigate the completeness of MERLIN by providing a lower bound on the proportion of in- formation that it may miss. Finally, our dataset and the MERLIN implementation are freely available. [less ▲]

Detailed reference viewed: 60 (8 ULg)