Benoit Ozell

École Polytechnique de Montréal, Computer Engineering and Software Engineering, Faculty Member

École Polytechnique de Montréal, Cmputer and Software Engineering, Faculty Member

Followers

Following

Co-authors

Public Views

Address: Montréal, Québec, Canada

less

Interests

uploads

Papers

A Geometrie Modeller for Turbomachinery Applications

This paper deseribes a software paekage modelling of turbines, as weIl as for body-fitted eoordin... more This paper deseribes a software paekage modelling of turbines, as weIl as for body-fitted eoordinate grid. The paekage used respeetively for: tailored for the geometrie the automatie generation of a eonsists of four programs 1. The ereation and the modi fi cation of a model;" the designer ean "edit" the model by means of commands whose basic entities are points, profiles, blades,the hub and the shroud. 2. The refinement of the model by the distribution of points over each profile defining the blade, and then by the interpolation of new intermediate profiles between the hub and the shroud. 3. The construetion of surfaces delimiting the blade-to-blade ehannel boundaries (the eomputational domain). 4. The calculation of a body-fitted coordinate system, inside the channel, by the solution of a system of differential equations. A set of modeled turbines is shown to illustrate the results of eaeh st.ep.

Hydraulic Turbine Performance Prediction by Supercomputing

Virtual reality simulator for scoliosis surgery training: Transatlantic collaborative tests

Scoliosis is a complex deformation of the spine requiring, in severe cases, a highly delicate and... more Scoliosis is a complex deformation of the spine requiring, in severe cases, a highly delicate and invasive surgical instrumentation operation to correct the spinal deformities. Available traditional tools for surgical training have major drawbacks for which virtual reality (VR) technologies and computer simulation can offer solutions. In this paper, we introduce a surgical simulator integrating a complex patient-specific biomechanical model

A configurable visualization environment

The different steps in developing a simulation program, as well as the multiple application domai... more The different steps in developing a simulation program, as well as the multiple application domains, imply many expectations from visualization and the visualization environment greatly influences the perception of the information contained in the solution. The methodology presented is centered around the concept of configurability, i.e. the possibility for a user to specialize the visualizator for current needs and therefore create a working environment tailored for specific domains and situations. Configurability allows for the sharing of generic elements and algorithms of visualization, and also for a natural environment of communication. It provides functions for a linear thinking context (repetitive creation of same representations, systematic use of a set of images for comparison or validation), but also for exploration of the characteristics of the solution. This communication uses the paradigm and the syntagm of a language, the language of visualization. This work presents the results of an analysis of visualization from the point of view of linguistics. The goal is not to present new methods for displaying results, but it is rather an attempt to define its structure. We present visualization as an activity of communication of information. Visualization Environments Historically, in the visualization world, applications have generally preceded the structuration of ideas. Existing visualizators individually present new concepts and ideas, but without integrating them into a structured approach appropriate to a model of visualization. Early visualization tools were iri-house efforts carried out at the level of specific routines, custom made for a given problem, and written by the end°Copyright ©1995 by Ozell and Camarero. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission. user himself. These evidently lacked generality, both from the functionality and the portability perspectives. The first step to improve this, was to isolate the display functions. Hidden line removal, shading, interactive manipulations were given to a graphic language or even to specialized hardware. It was then possible to support a greater variety of equipment and to orient their development to conform with the emerging standards. The next step was to apply the same standardization to the dialogue functions using commercial libraries like OSF/Motif. The result is a modularization of the visualization process with the emergence of a well-defined core, consisting in data extraction and virtual image creation (Fig. 1). This evolution has been characterized by a shift from a situation where the end-user is also the author, to one where the development is carried out by professional computer scientists. The next phase in this evolutionary process, is the ability to service the diversity of needs ranging from debugging a grid generation or a simulation program, to the production phase of a project. This requires a configurable software package that allows to share the most generic elements of visualization: dialogue, graphics, basic extraction algorithms. Configurable is not to be confused with programmable. It is rather the ability to assemble, from a given tool set a combination of functions within a visual and communication environment, i.e. a non-programming environment. The current visualization environments can be grouped in three categories with varying flexibility. Programs [1, 2] offer a turnkey architecture with a fixed functionality that the user cannot modify. Libraries [3, 4] lend themselves to a better flexibility providing access to visualization "functions, but require programming knowledge. The interaction with the end-user is then the responsibility of the programmer. Visual programming environments [5, 6, 7, 8, 9] based on data flow diagrams are more recent. They are excellent for prototyping, but not u s E R Extraction + calculations

Wolverine: A Distributed Scene-Graph Library

Presence: Teleoperators & Virtual Environments, Feb 1, 2005

Apr	MAY	Jun
	05
2023	2024	2025

Benoit Ozell

uploads

Log In