On the collision-propagation and gather-update formulations of a cellular automata rule (2009)
Chopard, B., Falcone, J.-L., Razakanirina, R., Hoekstra, A., Caiazzo, A.
We consider two formulations of a cellular automata: the first one uses a gather-update paradigm and the second one a collision-propagation paradigm. We show the equivalence of both descriptions and,...
Error investigations in complex automata models for reaction-diffusion systems (2009)
Caiazzo, A., Falcone, J.L., Chopard, B., Hoekstra, A.G.
Complex Automata (CxA) have been recently introduced as a paradigm to simulate multiscale systems as a collection of generalized Cellular Automata on different scales. We present a basic mathematical...
Multi-scale modeling with cellular automata: The complex automata approach (2009)
Hoekstra, A.G., Falcone, J.-L., Caiazzo, A., Chopard, B.
Cellular Automata are commonly used to describe complex natural phenomena. In many cases it is required to capture the multi-scale nature of these phenomena. A single Cellular Automata model may not...
Towards a Complex Automata multiscale model of in-stent restenosis (2009)
Caiazzo, A., Evans, D., Falcone, J.-L., Hegewald, J., Lorenz, E., Stahl, B., ...
In-stent restenosis, the maladaptive response of a blood vessel to injury caused by the deployment of a stent, is a multiscale problem involving a large number of processes. We describe a Complex...
Asymptotic analysis of Complex Automata models for reaction–diffusion systems (2009)
Caiazzo, A., Falcone, J.-L., Chopard, B., Hoekstra, A.G.
Complex Automata (CxA) have been recently introduced as a paradigm to simulate multiscale multiscience systems as a collection of generalized Cellular Automata on different scales. The approach...
Towards a Complex Automata multiscale model of in-stent restenosis (2009)
Caiazzo, A., Evans, D., Falcone, J.-L., Hegewald, J., Lorenz, E., Stahl, B., ...
In-stent restenosis, the maladaptive response of a blood vessel to injury caused by the deployment of a stent, is a multiscale problem involving a large number of processes. We describe a Complex...
Academisch Proefschrift, Lilit Axner, Prof Dr, J. A. E. Spaan, Prof Dr, B. Chopard, ...
ter verkrijging van de graad van doctor aan de Universiteit van Amsterdam op gezag van de Rector Magnificus prof. dr. D. C. van den Boom ten overstaan van een door het college voor promoties...
Scale-splitting error in complex automata models for reaction-diffusion systems (2008)
Caiazzo, A., Falcone, J.L., Chopard, B., Hoekstra, A.G.
Complex Automata (CxA) have been recently proposed as a paradigm for the simulation of multiscale systems. A CxA model is constructed decomposing a multiscale process into single scale sub-models,...
Hoekstra, A.G., Lorenz, E., Falcone, J.-L., Chopard, B.
An agent-based coupling platform for complex automata (2008)
Hegewald, J., Krafczyk, M., Tölke, J., Hoekstra, A., Chopard, B.
The ability to couple distinct computational models of science and engineering systems is still a recurring challenge when developing multiphysics applications. The applied coupling technique is...
Treatment of renal artery aneurysm with the multilayer stent (2008)
HENRY, M, POLYDOROU, A, FRID, N, GRUFFAZ, P, CAVET, A, HENRY, I, ...
Evans, D.J.W., Lawford, P.V., Gunn, J., Walker, D., Hose, D.R., Smallwood, R.H., ...
The inherent complexity of biomedical systems is well recognized; they are multiscale, multiscience systems, bridging a wide range of temporal and spatial scales. While the importance of multiscale...
A study on young beech tree release in uneven-aged stands (2008)
Cordonnier, T., Ningre, F., Chopard, B., Piboule, A.
In uneven-aged stands, foresters often focus on the change in quality and vigour of a few young trees per hectare called future trees (7.5cm
With 1.3 106 ha, beech (Fagus sylvatica) is the third most represented species in France (Sardin et al. 2007). Because of its natural acute vitality, one of the major difficulties in its silviculture...
Simulating Time Harmonic Flows with the Regularized L-BGK Method (2007)
Axner, L., L"att, J., Hoekstra, A.G., Chopard, B., Sloot, P.M.A.
Toward a Complex Automata Formalism for Multi-Scale Modeling (2007)
Hoekstra, A.G., Lorenz, E., Falcone, J.-L., Chopard, B.
Hoekstra, A.G., Lorenz, E., Falcone, J.-L., Chopard, B.
Toward a Complex Automata Formalism for Multi-Scale Modeling (2007)
Hoekstra, A.G., Lorenz, E., Falcone, J.-L., Chopard, B.
Simulating Time Harmonic Flows with the Regularized L-BGK Method (2007)
Axner, L., Lätt, J., Hoekstra, A.G., Chopard, B., Sloot, P.M.A.
Introducing Complex Automata for Modelling Multi-Scale Complex Systems (2006)
Hoekstra, A.G., Chopard, B., Lawford, P., Hose, R., Krafczyk, M., Bernsdorf, J.M.
L'indice d'abroutissement : un nouvel indicateur de la relation "forêt-gibier" ? (2006)
Chevrier, T., Saïd, S., Toïgo, C., Hamard, J.P., Klein, F., Saint Andrieux, C., ...
Since 1980, researchers and managers have tried to develop new methods based on indicators of ecological changes to monitor deer populations. In that way, roe deer browsing rate on naturally...
Discrete Physics: a new way to look at cryptography (2005)
This paper shows that Physics is very close to the substitution-diffusion paradigm of symmetric ciphers. Based on this analogy, we propose a new cryptographic algorithm. Statistical Physics gives...
Liesegang patterns: Effect of dissociation of the invading electrolyte (1998)
Chopard, B., Droz, M., Magnin, J., Rácz, Z., Zrinyi, M.
The effect of dissociation of the invading electrolyte on the formation of Liesegang bands is investigated. We find, using organic compounds with known dissociation constants, that the spacing...
A lattice Boltzmann model for particle transport and deposition (1998)
(received; accepted) PACS. 47.11+j-- Computational methods in fluid dynamics. PACS. 02.70Ns-- Molecular dynamics and particle methods. PACS. 05.40+j-- Fluctuation phenomena, random processes, and...
Wave Propagation and Optimal Antenna Layout using a Genetic Algorithm (1998)
B. Chopard, Y. Baggi, P. Luthi, J. -f. Wagen
This paper discusses the computational approach we have used to devise an optimal mobile communication system (cellular phones) in an urban environment. We first present a lattice Boltzmann model for...
Chopard, B., Droz, M., Magnin, J., Racz, Z.
The A+B --> C reaction-diffusion process is studied in a system where the reagents are separated by a semipermeable wall. We use reaction-diffusion equations to describe the process and to derive a...
Models of Artificial Foreign Exchange Markets (1997)
this paper, we focus on a specific financial system, the so-called Foreign Exchange Market. We first review its main rules and describe its most notable properties. Then, we propose a simple model (a...
Contextual Coordination for Distributed Objects (1996)
Buffo, Mathieu, Héritier, C.A., Chopard, B.
This position paper explain why and how coordination may play a role in the development of distributed object applications.
Cellular Automata Model of Car Traffic in a Two-Dimensional Street Network (1996)
B. Chopard, P. O. Luthi, P.-A. Queloz
We propose a road traffic cellular automata model suitable to an urban environment. North, east, south and west car displacements are possible and road crossings are naturally implemented as rotary...