Search results for "STATISTICS"
showing 10 items of 7671 documents
Extension rapide de l'aire de répartition de Dikerogammarus villosus (Crustacé, Amphipode) en France : Causes et conséquences
2003
International audience
Terahertz Biomedical Imaging: From Multivariate Analysis and Detection to Material Parameter Extraction
2017
Terahertz imaging is an interesting route for biomedical analysis. In particular, cancer imaging is a subject of study for different teams [1,2]. A work is done in Bordeaux in partnership with a hospital to do terahertz analysis of breast tissue. This work is done in reflection with time domain imaging setup with fresh samples. The aim is to accurately assess tumor margins and which could in the future allow a quick validation of the precision of the surgical procedure and know if new surgery should be performed. We have presented in a previous paper [3] the use of automatic methods of image generation with different parameters [4] in order to explore the different contrasts that exist in t…
Factors of good visual outcome in acute post-cataract endophthalmitis (friends group)
2009
International audience; Purpose: To analyze initial clinical factors of good visual outcome in patients with acute endophthalmitis following cataract surgery. Methods: A prospective study was performed in 4 University hospital (Dijon, Grenoble, Lyon, Saint-Etienne, FRIENDS group) on 100 patients with acute post-cataract endophthalmitis. Factors related to cataract surgery (complications), the initial presentation and the microbiological identification were analyzed according to the final visual outcome using univariate and multivariate analysis (SPSS 12.0). Results: 46% out of the patients had a final visual acuity less than or equal to 0.3 logMar (good visual outcome) at 6 months while 10%…
A priori parameterisation of the CERES soil-crop models and tests against several European data sets
2002
Mechanistic soil-crop models have become indispensable tools to investigate the effect of management practices on the productivity or environmental impacts of arable crops. Ideally these models may claim to be universally applicable because they simulate the major processes governing the fate of inputs such as fertiliser nitrogen or pesticides. However, because they deal with complex systems and uncertain phenomena, site-specific calibration is usually a prerequisite to ensure their predictions are realistic. This statement implies that some experimental knowledge on the system to be simulated should be available prior to any modelling attempt, and raises a tremendous limitation to practica…
Le nombre de sujets dans les panels d'analyse sensorielle : une approche base de données
2012
The costs associated with sensory evaluation increase with the number of panelists to be enrolled. Classical power computation can be used to derive the minimal number of subjects of a sensory panel in order to control both type I (α risk) and type II (β risk) errors. However, this power computation requires estimates of the size of the product effect to be sought and of the residual variability of the ANOVA model used. Generally, both product effect size and residual variability are difficult to estimate a priori by the sensory analyst. This work offers estimations of these two parameters thanks to the analysis of hundreds descriptive andhedonic studies collected respectively in two databa…
A comparison of salt perception and acceptance of salt reduced food among children and adults
2014
International audience
Relative age effect among French swimmers
2022
L'objectif de cette étude était de révéler la présence de l'effet de l'âge relatif parmi les nageurs Français et de proposer une méthode de rééquilibrage afin de mieux apprécier le potentiel de l'athlète en fonction de sa catégorie et de sa discipline. 62 610 nageurs entre 10 et 16 ans sur la discipline du 100m nage libre en bassin de 50m sont considérés pour cette étude. Parmi eux, moins d'un nageur sur cinq entre 13 et 16 ans est né dans le dernier trimestre de l'année. Pour éviter l'abandon ou la perte de vue des nageurs, nous avons mis en place une méthode de rééquilibrage basée sur la performance du nageur, son âge exact au moment de la compétition et le coefficient de régression entre…
Approche multi-critère pour la caractérisation des adventices
2022
The objective of this thesis is to develop a way to detect weeds in a field using multispectral images, in order to determine which weeds should be eliminated during the current crop cycle and more particularly at the early stages. The multi-criteria approach focuses on the spatial arrangement, the spec- tral signature, the morphology and the tex- ture of the plants located in the plots. This work proposes a method for selecting the best criteria for optimal discrimination for a given setup. Prior to the extraction of these crite- ria, a set of methods was developed in order to correct the errors of the acquisition de- vice, to precisely detect the vegetation and then to identify within the…
L’Église Saint-Pierre de Thaon (Calvados) : premières approches archéologiques et anthropologiques
2008
National audience
A history of sanitary quality of wines. Medical Expertise, Hygienism and Oenological Practices (late XIXe century –XXe century)
2018
International audience