Animation phénoménologique de la mer --- une approche énactive ---

Abstract : \noindent(\large\bf Specific keywords)~: (\em active object, phenomenon, forecast-medium, experimentation-medium, aisthesis, praxis, poiesis, prediction, action, adaptation, enactive entity, enactive modeling, enactive assumption.)
\vspace(5mm)

\centerline(\LARGE\bf Abstract)
\vspace(5mm)

This thesis lies within the framework of the modeling of natural
phenomena for an instrumentation in a virtual reality system.
A virtual reality system is a world of models, including human in the simulation loop. It can be seen as a tool for modern cybernetics.
We then (\bf conceptualized) a method according to what we call the
(\em enactive assumption), founded on the principles of autonomy, active
perception, enaction and closure under efficient causality, to propose
a constructive method of modeling known as (\em enactive modeling). We
(\bf formalized) the model generated by this method, in order to guide the
modelisator to conceive enactives entities, e.g.: models representing natural phenomena in the system of virtual reality. Then we (\bf instrumented) the enactive model by proposing the experimentation of
the model. This leads to the participative simulation of entities making live
the phenomenologic models, so that the model is experimentable
throughout its creation. Lastly, we (\bf applied) this method to carry out
an interactive animation of the sea experimentable by
sailors or oceanographers.

The enactive assumption which we defend gathers three principal ideas:
\begin(enumerate)
\item modeling translates a human praxis.
\item the phenomena are modelled as autonomous entities.
\item the interactions between entities pass by a medium which is created and worked by the entities themselves.
\end(enumerate)
Firstly, modeling is a human activity which translates implicitly and must explicitly translate a modeling final cause. The modelled phenomena are the affordances of a user of the model.\\
Secondly, the autonomisation of the models, consisting in giving to the model of the natural phenomenon capacities of perception, action and adaptation, is an effective pragmatic solution for the modeling of a complex system where many models must interact in multiple ways.\\
Thirdly, by delegating to the models the manufacture of the medium which they need to determine their interactions, we can simulate in the same virtual environment, the models related to phenomenologic scales very different the ones from the others, without passing by an apriori grid of the time-space, while respecting, for example, the conservation laws of physics.\vspace(2mm)

These conceptual assumptions are translated into a pragmatic formal model, in which we formalize concepts like active object, phenomenon, medium, aisthesis, praxis, poiesis, prediction, action, adaptation, enactive entity and second order organization. Formalization provides a method of natural phenomena modeling. Instrumentation of these models makes it possible to the originator to actually simulate the multi-model system at any time of its creation.

We apply these ideas to carry out an interactive animation of the surface of the sea. The model obtained is named IPAS
(Interactive Phenomenological Animation of the Sea) and allows the animation of a water surface of several square kilometres. IPAS deals, on the one hand with the marine concepts of wave group, breaking, synoptic wind, local wind, current and bathymetry, on the other hand with the physical concepts of action conservation, wind stress, gravity wave refraction for their interactions. Simulations take place in real time and do not require any precalculation.

It provides the premises of a modeling methodology for the participative simulation of complex systems.
This thesis on the manner of simulating natural phenomena, opens many prospects to come. One will try, for example,
\begin(itemize)
\item to consolidate the oceanographical validity of IPAS and to enrich the model by carrying out virtual experiments by evolution of state of sea and to compare them with theoretical or experimental results,
\item to prove his formal equivalence with the traditional numerical methods for PDE solving, when the entities are interactions between elementary volumes having to respect the same physical laws as those having made it possible to establish the equations.
\item to use this modeling method for other phenomena that the surface of the sea (hydrology, meteorology, sismology, biochemistry, biology, pedagogy, sociology, economy),
\end(itemize)
Document type :
Theses
Modélisation et simulation. Université de Bretagne occidentale - Brest, 2004. Français
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https://tel.archives-ouvertes.fr/tel-00007695
Contributor : Marc Parenthoën <>
Submitted on : Wednesday, December 22, 2004 - 7:05:15 PM
Last modification on : Thursday, June 2, 2016 - 10:32:26 AM
Document(s) archivé(s) le : Wednesday, November 23, 2016 - 5:33:19 PM

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Marc Parenthoën. Animation phénoménologique de la mer --- une approche énactive ---. Modélisation et simulation. Université de Bretagne occidentale - Brest, 2004. Français. <tel-00007695v2>

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