Options
Besson, Olivier
Nom
Besson, Olivier
Affiliation principale
Email
Olivier.Besson@unine.ch
Identifiants
Résultat de la recherche
Voici les éléments 1 - 10 sur 15
- PublicationMétadonnées seulementSpace-time integrated least squares: a time-marching approach(2004)
; de Montmollin, GautierA time-marching formulation is derived from the space-time integrated least squares (STILS) method for solving a pure hyperbolic convection equation and is numerically compared to various known methods. Copyright (C) 2004 John Wiley Sons, Ltd. - PublicationMétadonnées seulementPATUMOD: a compartment model of vegetation dynamics in wooded pastures(2002)
; ; A system of wooded pasture can be described by seven biological state variables (trees, shrubs, underwood grasslands, fallows, eutrophic meadows, oligrotrophic lawns and cattle) linked by a network of dynamic interactions, which are controlled by altitude and human activities. PATUMOD is a spatially implicit compartment model designed to simulate vegetation dynamics in such silvopastoral ecosystems at community level and according to an equilibrium paradigm. Computer simulations show that the state variables generally end up on a steady-state (one-point attractor), independent on their initial values but strongly dependent on cattle load. At a given altitude, to each value of the stock density is corresponding a stable equilibrium characterised by a given relative cover of each vegetation component. If the initial values are very far of the attractor, a long succession of intermediate stages is required before leading to the steady-state. A remarkable exception to this rule can occur at low altitude, with a repellor between switching trajectories towards two attractors, corresponding to a threshold between scarcely and densely wooded pastures. PATUMOD can be applied to simulate different management scenarios, which include changing global stock density and cutting trees or shrubs. (C) 2002 Elsevier Science B.V. All rights reserved. - PublicationMétadonnées seulementUn modèle asymptotique en océanographie(1990)
; - PublicationAccès libreLe cadre physique [Le lac de Neuchâtel](2004)
; Robert-Charrue, Charles - PublicationMétadonnées seulementHele-Shaw approximation for resin transfer molding(2005)
; A Hele-Shaw flow is studied as the limit of a Stokes flow. The velocity fields associated to each fluid solve a fluid dynamic problem with time dependent domain. The moving boundary formulation is based on a pseudo-concentration equation. Some existence of solution of this set of equations is given using the classical Leary-Schauder Theorem and the use of space-time integrated least square method for the transport equation. - PublicationAccès libreOptimisation issues in 3D multiple-point statistics simulation(: Julián M. Ortiz and Xavier Emery, Mining Engineering Department, University of Chile., 2008-12)
; ; Multiple-point statistics simulation has gained wide acceptance in recent years and is routinely used for simulating geological heterogeneity in hydrocarbon reservoirs and aquifers. In classical implementations, the multiple-point statistics inferred from the reference training image are stored in a dynamic data structure called search tree. The size of this search tree depends on the search template used to scan the training image and the number of facies to be simulated. In 3D applications this size can become prohibitive. One promissing avenue for drastically reducing the RAM requirements consists of using dynamically allocated lists instead of search trees to store and retrieve the multiple–point statistics. Each element of this list contains the identification of the data event together with occurence counters for each facies. First results show that implementing this list based approach results in reductions of RAM requirement by a factor 10 and more. The paper discusses in detail this novel list based approach, presents RAM and CPU performance comparisons with the (classical) tree based approach. - PublicationMétadonnées seulement
- PublicationMétadonnées seulement
- PublicationMétadonnées seulement