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Search Results: 1 - 10 of 3992 matches for " Alain Micaelli "
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Designing a Virtual Manikin Animation Framework Aimed at Virtual Prototyping
Antoine Rennuit,Alain Micaelli,Claude Andriot,Fran?ois Guillaume,Nicolas Chevassus,Damien Chablat,Patrick Chedmail
Computer Science , 2007,
Abstract: In the industry, numerous commercial packages provide tools to introduce, and analyse human behaviour in the product's environment (for maintenance, ergonomics...), thanks to Virtual Humans. We will focus on control. Thanks to algorithms newly introduced in recent research papers, we think we can provide an implementation, which even widens, and simplifies the animation capacities of virtual manikins. In order to do so, we are going to express the industrial expectations as for Virtual Humans, without considering feasibility (not to bias the issue). The second part will show that no commercial application provides the tools that perfectly meet the needs. Thus we propose a new animation framework that better answers the problem. Our contribution is the integration - driven by need ~ of available new scientific techniques to animate Virtual Humans, in a new control scheme that better answers industrial expectations.
Balanced Virtual Humans Interacting with their Environment
Antoine Rennuit,Alain Micaelli,Xavier Merlhiot,Claude Andriot,Fran?ois Guillaume,Nicolas Chevassus,Damien Chablat,Patrick Chedmail
Computer Science , 2007,
Abstract: The animation of human avatars seems very successful; the computer graphics industry shows outstanding results in films everyday, the game industry achieves exploits... Nevertheless, the animation and control processes of such manikins are very painful. It takes days to a specialist to build such animated sequences, and it is not adaptive to any type of modifications. Our main purpose is the virtual human for engineering, especially virtual prototyping. As for this domain of activity, such amounts of time are prohibitive.
Integration of a Balanced Virtual Manikin in a Virtual Reality Platform aimed at Virtual Prototyping
Antoine Rennuit,Alain Micaelli,Xavier Merlhiot,Claude Andriot,Fran?ois Guillaume,Nicolas Chevassus,Damien Chablat,Patrick Chedmail
Computer Science , 2007,
Abstract: The work presented here is aimed at introducing a virtual human controller in a virtual prototyping framework. After a brief introduction describing the problem solved in the paper, we describe the interest as for digital humans in the context of concurrent engineering. This leads us to draw a control architecture enabling to drive virtual humans in a real-time immersed way, and to interact with the product, through motion capture. Unfortunately, we show this control scheme can lead to unfeasible movements because of the lack of balance control. Introducing such a controller is a problem that was never addressed in the context of real-time. We propose an implementation of a balance controller, that we insert into the previously described control scheme. Next section is dedicated to show the results we obtained. Finally, we propose a virtual reality platform into which the digital character controller is integrated.
Passive Control Architecture for Virtual Humans
Antoine Rennuit,Alain Micaelli,Xavier Merlhiot,Claude Andriot,Fran?ois Guillaume,Nicolas Chevassus,Damien Chablat,Patrick Chedmail
Computer Science , 2007,
Abstract: In the present paper, we introduce a new control architecture aimed at driving virtual humans in interaction with virtual environments, by motion capture. It brings decoupling of functionalities, and also of stability thanks to passivity. We show projections can break passivity, and thus must be used carefully. Our control scheme enables task space and internal control, contact, and joint limits management. Thanks to passivity, it can be easily extended. Besides, we introduce a new tool as for manikin's control, which makes it able to build passive projections, so as to guide the virtual manikin when sharp movements are needed.
Carnot Factor of a Vapour Power Cycle with Regenerative Extraction  [PDF]
Duparquet Alain
Journal of Modern Physics (JMP) , 2017, DOI: 10.4236/jmp.2017.811107
Abstract: The present paper describes the energy analysis of a regenerative vapour power system. The regenerative steam turbines based on the Rankine cycle and comprised of vapour extractions have been used industrially since the beginning of the 20th century, particularly regarding the processes of electrical production. After having performed worked in the first stages of the turbine, part of the vapour is directed toward a regenerative exchanger and heats feedwater coming from the condenser. This process is known as regeneration, and the heat exchanger where the heat is transferred from steam is called a regenerator (or a feedwater heater). The profit in the output brought by regenerative rakings is primarily enabled by the lack of exchange of the tapped vapour reheating water with the low-temperature reservoir. The economic optimum is often fixed at seven extractions. One knows the Carnot relation, which is the best possible theoretical yield of a dual-temperature cycle; in a Carnot cycle, one makes the assumption that both compressions and expansions are isentropic. This article studies an ideal theoretical machine comprised of vapour extractions in which each cycle partial of tapped vapour obeys these same compressions and isentropic expansions.
Essay on Playfulness and Play in Children’s Art Class: A Reflection Based on Winnicott  [PDF]
Alain Savoie
Creative Education (CE) , 2019, DOI: 10.4236/ce.2019.102024
Abstract: From a survey of literature, this article presents some reflections about the value of play and playfulness as, respectively, an activity and a creative attitude of mind to be fostered in art education in children. Indeed, at the heart of any artistic creative impulse sits a playful attitude of the artist towards realitya feature that has been highlighted by the psychoanalyst Winnicott. Following his line of thought, we propose that the art teacher must place the learner in a position of being able to play with her/him, in order to overlap their two areas of playing and establish a learning space. Playfulness and play tend to be confused with impulsive and disruptive behaviours and generally more tolerated at home then school. We claim that artistic activities in school should always be play-based and take place in a playful environment because art and creation emerge from and grow in and as play.
Fuel R&D Needs and Strategy towards a Revision of Acceptance Criteria
Fran?ois Barré,Claude Grandjean,Marc Petit,Jean-Claude Micaelli
Science and Technology of Nuclear Installations , 2010, DOI: 10.1155/2010/646971
Abstract: The study of fuel behaviour under accidental conditions is a major concern in the safety analysis of the Pressurised Water Reactors. The consequences of Design Basis Accidents, such as Loss of Coolant Accident and Reactivity Initiated Accident, have to be quantified in comparison to the safety criteria. Those criteria have been established in the 1970s on the basis of experiments performed with fresh or low irradiated fuel. Starting in the 1990s, the increased industrial competition and constraints led utilities to use fuel in more and more aggressive conditions (higher discharge burnup, higher power, load follow, etc.) and create incentive conditions for the development of advanced fuel designs with improved performance (new fuel types with additives, cladding material with better resistance to corrosion, etc.). These long anticipated developments involved the need for new investigations of irradiated fuel behaviour in order to check the adequacy of the current criteria, evaluate the safety margins, provide new technical bases for modelling and allow an evolution of these criteria. Such an evolution is presently under discussion in France and several other countries, in view of a revision in the next coming years. For this purpose, a R&D strategy has been defined at IRSN. 1. Industrial Context The economic context is increasingly demanding for the utilities who, in order to keep competitive, have to produce the cheapest possible KWh while retaining sufficient flexibility to adjust the energy produced to the demand. The response of nuclear reactor operators is to increase reactor power, the cycle length (and thus discharge burnup), and the fuel enrichment. Applying flexible operating modes involve power variations imposing high stresses on the fuel which must be taken into account when considering changes in Safety Assessment. Fuel rods are therefore subjected to increasing mechanical, thermal and chemical stresses in the new fuel management procedures, while having to satisfy the following contradictory requirements: (i)reliability, to avoid degrading the operating conditions (e.g., few manufacturing defects, low deformation of assemblies, etc.),(ii)robustness, to withstand the contingencies of the operating conditions (e.g., low corrosion),(iii)high performance, to provide margins that can be used in operation (sufficiently high PCI limit; proper behaviour in accident conditions: RIA, LOCA, etc.). Furthermore, fuel elements are complex objects, the design of which requires an in-depth knowledge of coupled phenomena (neutronics, thermohydraulic,
Design of a Performance Measurement Framework for Cloud Computing  [PDF]
Luis Bautista, Alain Abran, Alain April
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.52011
Abstract: Cloud Computing is an emerging technology for processing and storing very large amounts of data. Sometimes anomalies and defects affect part of the cloud infrastructure, resulting in a performance degradation of the cloud. This paper proposes a performance measurement framework for Cloud Computing systems, which integrates software quality concepts from ISO 25010.
Software Engineering Principles: Do They Meet Engineering Criteria?  [PDF]
Kenza Meridji, Alain Abran
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.310114
Abstract: As a discipline, software engineering is not as mature as other engineering disciplines, and it still lacks consensus on a well-recognized set of fundamental principles. A 2006 analysis surveyed and analyzed 308 separate proposals for principles of software engineering, of which only thirty-four met the criteria to be recognized as such. This paper reports on a further analysis of these thirty-four candidate principles using two sets of engineering criteria derived from: A) the engineering categories of knowledge defined by Vincenti in his analysis of engineering foundations; and B) the joint IEEE and ACM software engineering curriculum. The outcome of this analysis is a proposed set of nine software engineering principles that conform to engineering criteria.
Extending Extreme Programming User Stories to Meet ISO 9001 Formality Requirements  [PDF]
Malik Qasaimeh, Alain Abran
Journal of Software Engineering and Applications (JSEA) , 2011, DOI: 10.4236/jsea.2011.411074
Abstract: For software organizations needing ISO 9001 certification, including those that have adopted agile methodologies, it is important that their software life cycle processes be able to manage the requirements imposed by this certification standard. However, the user stories in the XP agile methodology do not provide auditors with enough evidence that certain steps and activities have been performed in compliance with ISO 9001. This paper proposes an extension to the user story, based on four sub processes related to the CMMI-DEV model: 1) identification of the source of the user story; 2) categorization of the non functional requirements; 3) identification of the user story relationships; and 4) prioritization of the user stories. These sub processes are aligned with the XP release planning phase, and enhance the ability of user stories to accumulate the information that is mandatory for achieving ISO 9001 certification.
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