Etude diachronique de 1948 à 1990 de l’évolution du littoral des plages de Nonza et d’Albo (Cap Corse) par traitement analogique de photographies aériennes

in Photo-interprétation (1996), 34(1996/1), 47-61

Etude différentielle du développement opératoire

in Recherches sur les handicaps socioculturels de 0 à 7-8 ans (1973)

Etude du bassin versant du Rieu de la place de Taintignies,

Report (2007)

Etude du classement par forêts aléatoires d'échantillons perturbés à forte structure d'interaction

Doctoral thesis (2005)

Amongst classification methods, forests of decision trees (Random Forests, BREIMAN, 2001) are highly versatile concerning descriptive attributes' or target variable's nature and shape of the concept to ... [more ▼]

Amongst classification methods, forests of decision trees (Random Forests, BREIMAN, 2001) are highly versatile concerning descriptive attributes' or target variable's nature and shape of the concept to estimate. Their diffusion in agronomical sciences is slowed by a lack of information about their ability to learn models with high interaction structures using learning samples with few examples and affected by random noise and irrelevant attributes. This research aim to fill this gap by a systematic exploration of those factors' effects and of the parameters of the Random Forests method, which is done by computer simulations, taking as a reference the classification trees generated by Breiman's CART method (1984). Results show that generating random forests with a partially deterministic attributes selection and a forest size of at least 100 or 500 trees give the best prediction accuracy. Those random forests show a significant increase in prediction accuracy on CART trees, even for low learning sample size (50 examples). This advantage reduce with the global perturbation level (noise and irrelevant attributes) but increase with the learning sample size, as random forests aren't affected by the asymptotic limitation of the learning curve showed by CART method. [less ▲]

Etude du commerce agricole et agro-alimentaire entre la Pologne et la Belgique et entre la Pologne et l'Espagne. Etude du fonctionnement des institutions publiques chargées de la promotion intérieure et extérieure des produits agro-alimentaires

Report (1992)

Etude du comportement au feu des structures mixtes acier-béton

Doctoral thesis (1987)

This Ph. D. thesis contains the basic therories at the base of the computer software CEFICOSS, the predecessor of the computer software SAFIR.

Etude du comportement d’échangeurs présentant en entrée un gaz chargé en humidité : Etude de la condensation dans un EGR air/eau glycolée

Report (2008)

Etude du comportement d'un laser continu à colorant

Master's dissertation (1996)

Étude du comportement de Baillonella toxisperma Pierre (moabi) dans les trouées d’abattage enrichies

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2009), 13(2), 317-324

The moabi (Baillonella toxisperma Pierre) is a commercial tree in central Africa. Although forest gaps are generally considered as favorable to the regeneration of this species, in this study, a ... [more ▼]

The moabi (Baillonella toxisperma Pierre) is a commercial tree in central Africa. Although forest gaps are generally considered as favorable to the regeneration of this species, in this study, a preliminary inventory conducted within a selective exploitation located in the Dja district, southeastern Cameroon, found a low density of 12.7 seedlings.ha-1 within logging gaps. This suggests that the species was in fact poorly represented in logging gaps. In order to further study the behavior of the moabi in logging gaps, 795 seeds were planted in 15 logging gaps and 410 saplings from a tree nursery were introduced in 15 other gaps. A biannual monitoring spanning a period of 30 months showed a 75.9% survival rate for seedlings and 95.5% for saplings. Despite our observation of a significant difference in growth rates between both methods during the first semester, after 30 months of monitoring, seedlings and saplings had reached similar growth rates (167.5 cm and 160.6 cm for seedlings and saplings, respectively). On average, 6.1% of B. toxisperma saplings emerged naturally from the competitive vegetation and had a higher growth rate than other plants species. Growth differences between plants were mainly explained by the geographical orientation of the logging gap (N-S unfavorable) and the density of Macaranga spp. whose abundance inhibits the development of B. toxisperma. In conclusion, both the high survival rate of B. toxisperma in logging gap and its 10 fold higher growth rate in the latter environment when compared to canopy cover suggest the implementation of forestry methods using logging gap during reforesting operations. [less ▲]

Etude du comportement du film de surfactine à l'interface air-eau

Poster (1993, May 13)