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Search Results: 1 - 10 of 2218 matches for " Antoine Rennuit "
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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.
Decision Support for the Construction of Farm-Scale Biogas Digesters in Developing Countries with Cold Seasons
Charlotte Rennuit,Sven Gjedde Sommer
Energies , 2013, DOI: 10.3390/en6105314
Abstract: Biogas production is a clean renewable energy source that can improve lives in developing countries. However, winter temperatures in some areas are too low to enable enough biogas production in small unheated digesters to meet the energy requirements of households. Low-cost, high yield reactors adapted to the local climate are needed in those situations. A decision-support model was developed to assist in the design of biogas reactors capable of meeting households’ year-round energy needs. Monthly biogas production relative to household energy needs was calculated for the scenario of suburban Hanoi, Vietnam. Calculations included pig number, slurry (manure water mixture) dilution, retention time and biogas/solar heating. Although using biogas to heat the digester increased biogas production, it did not lead to an energy surplus, particularly with the 1:9 slurry dilution rate commonly used on pig farms. However, at a 1:3 slurry dilution, the use of solar heating to provide 90% and biogas 10% of the heat required to heat the digester to 35 °C improved the biogas production by 50% compared to psychrophilic production. The energy needs of an average five-person family throughout the year required 17 fattening pigs. This model can establish the best solution for producing sufficient energy throughout the year.
Amenability and the Extension Property  [PDF]
Antoine Derighetti
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.519279
Abstract: Let G be a locally compact group, H a closed amenable subgroup and u an element of the Herz Figà-Talamanca algebra of H with compact support, we prove the existence of an extension of u to G, with a good control of the norm and of the support of the extension.
Monetary Policy Regulation for the Bank of Central African States (BEAC)  [PDF]
Antoine Ngakosso
Modern Economy (ME) , 2017, DOI: 10.4236/me.2017.89076
Abstract: This paper aims to put forward a reaction function concerning the behaviour of the Bank of the Central African States (BEAC) turned toward the future then increasing the exchange rate to ensure the internal and external balance in the countries of this monetary zone. Based on the CFA currency and US dollar equivalence, it comes out that there is a strong non linearity between the interest rate and the exchange rate gap. The optimal gap level of the exchange rate in long term (short term) beneath which the monetary authorities should try to reduce the nominal interest rate is 277 F CFA (260 F CFA) and beyond which they will increase to maintain internal and external balance of the economy of the countries in this zone. So, the exchange rate should be taken as a target whose drift should govern the adjustment of the monetary policy instruments notably the interest rate.
Fiscal Policy and Economic Cycles in Congo  [PDF]
Antoine Ngakosso
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.91011
Abstract: The purpose of this paper is to respond on discretionary fiscal policy on economic cycles in Congo. A fiscal reaction function developed by Huart was thus estimated over the 1989-2015 period. It comes out from the results that the fiscal policies carried out during this period were both counter-cyclical and pro-cyclical expansionist. This resulted in instability of the public debt and an accumulation of payment arrears.
Semantic-Communicative Structure and Word Order in Mandarin Chinese  [PDF]
Antoine Tremblay, David Beck
Open Journal of Modern Linguistics (OJML) , 2013, DOI: 10.4236/ojml.2013.31010
Abstract:

In some languages more than in others, communicative considerations—such as what a message is about, what information is new or old, and whether this or that participant is in the Speaker’s focus of attention—constrain the structure of a sentence. The goal of the present paper is to describe how different Semantic-Communicative Structures affect word order in simple mono-transitive sentences without coverbs or adverbial phrases in Mandarin Chinese. The discussion is couched in the Meaning-Text framework, relevant parts of which are clarified at the onset of the paper. We argue that Subject-Verb-Object (SVO) sentences are communicatively unmarked in that they do not signal any particular communicative consideration. Other word orders, however, specifically encode certain communicative considerations. This is the case of Prolepsisi-Subjecti-Verb-Object (PiSiVO) and Object-Subject-Verb (OSV) sentences, which are discussed here.

The Standalone and the Portfolio Risk of the Rogers Energy Commodity Index  [PDF]
Samih Antoine Azar
Theoretical Economics Letters (TEL) , 2019, DOI: 10.4236/tel.2019.94045
Abstract: This paper tackles the rather recent weekly period from January 18, 2005 to February 28, 2018, encompassing 523 observations. The portfolio is constructed from the perspective either of a US investor or of a Lebanese one, since the US dollar foreign exchange rate was pegged during the above whole period. The portfolio consists of an investment in the US S & P 500 stock market index and in three Rogers international commodity indexes: agricultural, energy, and metals. The purpose of the paper is to estimate the diversification benefits of the energy commodity index. These benefits arise from the fall in the volatility of the investment portfolio when it is compared to an investment in the energy index only, or in the S & P 500 only. The procedure follows the seminal approach of Markowitz. The inputs of the model are the variance/covariance matrix, the average log returns, and the condition that all investment shares should sum up to 1. The outputs, obtained by matrix manipulation, are the optimal investment shares in the four assets, the volatilities of the optimal portfolios, the characteristics of the efficient frontier, the relation between portfolio shares and the expected, or required return, and finally, the predicted Capital Market Line (CML). The evidence shows that, by holding a portfolio composed of the above four assets, the volatilities are substantially reduced. Moreover, and since short sales are allowed in the model, all optimal investment shares in the energy commodity asset are negative, meaning that in the optimal portfolios the positions in the energy index are short positions. The paper points to the significantly high relative riskiness of the energy index, as a stand-alone asset, or as an aggressive and speculative investment on the CML, and to the substantial portfolio benefits of shorting this index.
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