Search results for "forest"

Kā Paleijas Jahnis sawu buhschanu kohpis [Kā Paleijas Jānis savu būšanu kopis]

1844

Discussion of "Hydraulic Model of Transition of Transient to Steady Flows in the Vadose Zone" by Yaguo Zhang, Tonglu Li, Wei Shen, and Yu Wang

2020

The authors wrote an interesting article dealing with a simple hydraulic model to illustrate the transition mechanism of transient to steady flows in the vadose zone. The soil behavior is described by a set of nine vertically aligned cylinders, each opened at the top and with a small outlet at the bottom. The water level dynamic of each cylinder, associated with an intermittent constant rainfall applied to the top cylinder, C0, was analyzed and numerical simulations were performed. The only objective of this discussion is to show that results similar to those proposed by the authors could be obtained by using the recently introduced Richards equation analytical solution, under gravity-drive…

Pilnasiņu zirgi sacīkstēs un vaislā

1932

Tekstu papildina 20 ilustrācijas un 71 tabula.

A Supervised Learning Framework for Automatic Prostate Segmentation in Trans Rectal Ultrasound Images

2012

International audience; Heterogeneous intensity distribution inside the prostate gland, significant variations in prostate shape, size, inter dataset contrast variations, and imaging artifacts like shadow regions and speckle in Trans Rectal Ultrasound (TRUS) images challenge computer aided automatic or semi-automatic segmentation of the prostate. In this paper, we propose a supervised learning schema based on random forest for automatic initialization and propagation of statistical shape and appearance model. Parametric representation of the statistical model of shape and appearance is derived from principal component analysis (PCA) of the probability distribution inside the prostate and PC…

Region-based segmentation on depth images from a 3D reference surface for tree species recognition.

2013

International audience; The aim of the work presented in this paper is to develop a method for the automatic identification of tree species using Terrestrial Light Detection and Ranging (T-LiDAR) data. The approach that we propose analyses depth images built from 3D point clouds corresponding to a 30 cm segment of the tree trunk in order to extract characteristic shape features used for classifying the different tree species using the Random Forest classifier. We will present the method used to transform the 3D point cloud to a depth image and the region based segmentation method used to segment the depth images before shape features are computed on the segmented images. Our approach has be…

A classification approach to prostate cancer localization in 3T Multi-Parametric MRI

2016

International audience; Multiparametric-magnetic resonance imaging (mp-MRI) has demonstrated, in many studies, its potential in prostate cancer detection and analysis. We propose a supervised classification approach based on mp-MRI data base of 20 patients, in order to localize prostate cancer and to achieve a cartographic representation of the prostate voxels based on classification results. Proposed method provides a computer aided detection (CAD) software for prostatic cancer. For that, we have extracted varied features providing functional, anatomical and metabolic information helping the classifier to distinguish between three different classes ("Healthy", "Benign" and "Pathologic"). W…

Hommes des bois ? Socio-anthropologie d'un groupe professionnel

2007

National audience; Les préjugés liés aux forestiers sont tenaces. Ainsi, puisque selon la culture occidentale on ne peut longtemps séjourner en forêt sans y perdre son humanité, les forestiers sont toujours soupçonnés de sauvagerie. Le bûcheron, figure emblématique de ce milieu, reste « l’idiot moyen qu’a pas fini ses études, le gros ours du fond des bois » selon les termes de l’un d’entre eux. En plus de cette image sociale peu valorisante, l’activité des entrepreneurs de travaux forestiers (ETF) – des bûcherons, débardeurs et sylviculteurs indépendants – est aussi exceptionnellement dangereuse : un ETF sur cinq est victime d’un accident chaque année. Dès lors, choisir une telle profession…

Guide pratique de biostatistique

2022

A l’aide de clés de détermination simples et de cartes mentales, l’utilisateur de ce guide pratique pourra facilement identifier le test adéquat pour ses données en biologie et en écologie.Ce guide pratique de Biostatistique permet de choisir le test adapté au cas rencontré par l'étudiant ou l'enseignant en biologie. Il comporte plusieurs originalités majeures, notamment, la présentation des différentes étapes pour le choix et la conduite de tests statistiques pertinents, une adaptation du traitement des données sous R. Il inclut, à la fin de chaque chapitre, un arbre décisionnel des tests et des exercices choisis à partir de données biologiques et écologiques réelles tirées de la littératu…

Baselines and French Forests

2022

International audience

Land use functions — a multifunctionality approach to assess the impact of land use changes on land use sustainability

2008

Part 5. Regional and local evaluation - 17; International audience; The dramatic changes in land use observed in Europe in the last fifty years have generally resulted in improvement of human welfare and economic development. On the other hand, they have caused serious environmental problems. There is therefore a need for approaches that help to understand in an integrative way the economic, environmental and societal impacts that land use changes have on sustainability. Sustainability Impact Assessment(SIA), which assesses the impact of policies on sustainability, addresses this challenge. SIA partly builds on the concept of the multifunctionality of land which helps to deal with the compl…