The Experts below are selected from a list of 15270 Experts worldwide ranked by ideXlab platform
Cherif Larouci - One of the best experts on this subject based on the ideXlab platform.
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Pre-sizing methodology of DC-AC converters using a virtual Prototyping Tool applied to sequential multi-load systems
IET Power Electronics, 2013Co-Authors: Christophe Ledoux, Pierre Lefranc, Cherif LarouciAbstract:The increasing need for higher efficiency, weight and volume reduction in embedded applications is a starting point of this study which focuses on a pre-sizing methodology of power converters based on virtual Prototyping Tools to avoid physical prototypes. From a general point of view, the mutualisation of a three-phase inverter with the help of a power sharing system is introduced. The proposed design approach optimises N inverters and a {one inverter + N-power sharing system} topologies based on a generalised modelling and a virtual Prototyping Tool. The presented results based on a 3 kW-270 V DC bus application show that in addition to the switching frequency and the ambient temperature, the number of sequential loads is also a key of the optimisation parameters. Therefore the proposed methodology based on an optimisation process allows the power designers to compare N inverters and {one inverter + N-power sharing system} as a function of the load number N.
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Pre-sizing methodology of embedded static converters using a virtual Prototyping Tool based on an optimisation under constraints method: comparaison of two power-sharing topologies
IET Electrical Systems in Transportation, 2013Co-Authors: Christophe Ledoux, Pierre Lefranc, Cherif LarouciAbstract:This study deals with pre-sizing methodology of embedded static converters using optimisation for which high performances of weight, volume and efficiency are required. Moreover, in the automotive and aircraft domains, power-sharing architectures should be an other investigation path to reach such performances. The idea of power sharing is suitable and judicious if the actuators are in the same power range. In this study, the authors consider three electrical machines sequentially driven. The first solution is to use three independent inverters without power sharing, the second one is an inverter with a power-sharing system. A non-conventional DC–AC matrix converter is proposed to replace classical inverters. So as to overcome a priori power designers habits, a general modelling and optimisation is performed to provide a virtual Prototyping Tool to avoid physical Prototyping because of their exhaustive cost. The objective function is the overall volume (mainly the heatsink's volume). The optimisation results are presented and discussed. These preliminary results, under a three-AC drive assumption, show clearly that {inverter + power sharing system} and even the DC–AC matrix converter have an overall volume lower than the three-inverter solution.
George Fitzmaurice - One of the best experts on this subject based on the ideXlab platform.
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medusa a proximity aware multi touch tabletop
User Interface Software and Technology, 2011Co-Authors: Michelle Annett, Tovi Grossman, Daniel Wigdor, George FitzmauriceAbstract:We present Medusa, a proximity-aware multi-touch tabletop. Medusa uses 138 inexpensive proximity sensors to: detect a user's presence and location, determine body and arm locations, distinguish between the right and left arms, and map touch point to specific users and specific hands. Our tracking algorithms and hardware designs are described. Exploring this unique design, we develop and report on a collection of interactions enabled by Medusa in support of multi-user collaborative design, specifically within the context of Proxi-Sketch, a multi-user UI Prototyping Tool. We discuss design issues, system implementation, limitations, and generalizable concepts throughout the paper.
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UIST - Medusa: a proximity-aware multi-touch tabletop
Proceedings of the 24th annual ACM symposium on User interface software and technology - UIST '11, 2011Co-Authors: Michelle Annett, Tovi Grossman, Daniel Wigdor, George FitzmauriceAbstract:We present Medusa, a proximity-aware multi-touch tabletop. Medusa uses 138 inexpensive proximity sensors to: detect a user's presence and location, determine body and arm locations, distinguish between the right and left arms, and map touch point to specific users and specific hands. Our tracking algorithms and hardware designs are described. Exploring this unique design, we develop and report on a collection of interactions enabled by Medusa in support of multi-user collaborative design, specifically within the context of Proxi-Sketch, a multi-user UI Prototyping Tool. We discuss design issues, system implementation, limitations, and generalizable concepts throughout the paper.
Christophe Ledoux - One of the best experts on this subject based on the ideXlab platform.
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Pre-sizing methodology of DC-AC converters using a virtual Prototyping Tool applied to sequential multi-load systems
IET Power Electronics, 2013Co-Authors: Christophe Ledoux, Pierre Lefranc, Cherif LarouciAbstract:The increasing need for higher efficiency, weight and volume reduction in embedded applications is a starting point of this study which focuses on a pre-sizing methodology of power converters based on virtual Prototyping Tools to avoid physical prototypes. From a general point of view, the mutualisation of a three-phase inverter with the help of a power sharing system is introduced. The proposed design approach optimises N inverters and a {one inverter + N-power sharing system} topologies based on a generalised modelling and a virtual Prototyping Tool. The presented results based on a 3 kW-270 V DC bus application show that in addition to the switching frequency and the ambient temperature, the number of sequential loads is also a key of the optimisation parameters. Therefore the proposed methodology based on an optimisation process allows the power designers to compare N inverters and {one inverter + N-power sharing system} as a function of the load number N.
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Pre-sizing methodology of embedded static converters using a virtual Prototyping Tool based on an optimisation under constraints method: comparaison of two power-sharing topologies
IET Electrical Systems in Transportation, 2013Co-Authors: Christophe Ledoux, Pierre Lefranc, Cherif LarouciAbstract:This study deals with pre-sizing methodology of embedded static converters using optimisation for which high performances of weight, volume and efficiency are required. Moreover, in the automotive and aircraft domains, power-sharing architectures should be an other investigation path to reach such performances. The idea of power sharing is suitable and judicious if the actuators are in the same power range. In this study, the authors consider three electrical machines sequentially driven. The first solution is to use three independent inverters without power sharing, the second one is an inverter with a power-sharing system. A non-conventional DC–AC matrix converter is proposed to replace classical inverters. So as to overcome a priori power designers habits, a general modelling and optimisation is performed to provide a virtual Prototyping Tool to avoid physical Prototyping because of their exhaustive cost. The objective function is the overall volume (mainly the heatsink's volume). The optimisation results are presented and discussed. These preliminary results, under a three-AC drive assumption, show clearly that {inverter + power sharing system} and even the DC–AC matrix converter have an overall volume lower than the three-inverter solution.
Nikolaos G. Bourbakis - One of the best experts on this subject based on the ideXlab platform.
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A Prototyping Tool for Analysis and Modeling of Video Transmission Traces over
2006Co-Authors: Ming Yang, Nikolaos G. BourbakisAbstract:In the best-effort IP network, packet delay/loss will inevitably degrade the perceptual quality of real-time multimedia service, such as Voice-over-IP (VoIP), Video-onDemand (VoD), etc. Modeling, Prototyping, and analysis of traffic traces have always been very important and challenging topics in the area of multimedia communication. In general, packet loss/delay exhibits temporal dependence. Different Prototyping Tools, such as Bernoulli model, Gilbert model, Extended Gilbert model, Markov model, etc, have been proposed to model network trace. In this research, one VoD server and three clients have been setup to simulate a real VoD system. Different models have been applied to analyze and model the video transmission network traces obtained under RTP/UDP/IP protocol stack. Compared to the other Tools, Markov model offers the best Prototyping precision, in the sense of loss-run distribution and Forward Error Correction (FEC) performance prediction. As a powerful fast Prototyping Tool, Markov model will be very useful to model and analyze network traces and further improve the QoS in multimedia-over-IP.
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IEEE International Workshop on Rapid System Prototyping - A Prototyping Tool for Analysis and Modeling of Video Transmission Traces over IP Networks
Seventeenth IEEE International Workshop on Rapid System Prototyping (RSP'06), 1Co-Authors: Ming Yang, Nikolaos G. BourbakisAbstract:In the best-effort IP network, packet delay/loss will inevitably degrade the perceptual quality of real-time multimedia service, such as Voice-over-IP (VoIP), Video-on- Demand (VoD), etc. Modeling, Prototyping, and analysis of traffic traces have always been very important and challenging topics in the area of multimedia communication. In general, packet loss/delay exhibits temporal dependence. Different Prototyping Tools, such as Bernoulli model, Gilbert model, Extended Gilbert model, Markov model, etc, have been proposed to model network trace. In this research, one VoD server and three clients have been setup to simulate a real VoD system. Different models have been applied to analyze and model the video transmission network traces obtained under RTP/UDP/IP protocol stack. Compared to the other Tools, Markov model offers the best Prototyping precision, in the sense of loss-run distribution and Forward Error Correction (FEC) performance prediction. As a powerful fast Prototyping Tool, Markov model will be very useful to model and analyze network traces and further improve the QoS in multimedia-over-IP.
Michelle Annett - One of the best experts on this subject based on the ideXlab platform.
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medusa a proximity aware multi touch tabletop
User Interface Software and Technology, 2011Co-Authors: Michelle Annett, Tovi Grossman, Daniel Wigdor, George FitzmauriceAbstract:We present Medusa, a proximity-aware multi-touch tabletop. Medusa uses 138 inexpensive proximity sensors to: detect a user's presence and location, determine body and arm locations, distinguish between the right and left arms, and map touch point to specific users and specific hands. Our tracking algorithms and hardware designs are described. Exploring this unique design, we develop and report on a collection of interactions enabled by Medusa in support of multi-user collaborative design, specifically within the context of Proxi-Sketch, a multi-user UI Prototyping Tool. We discuss design issues, system implementation, limitations, and generalizable concepts throughout the paper.
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UIST - Medusa: a proximity-aware multi-touch tabletop
Proceedings of the 24th annual ACM symposium on User interface software and technology - UIST '11, 2011Co-Authors: Michelle Annett, Tovi Grossman, Daniel Wigdor, George FitzmauriceAbstract:We present Medusa, a proximity-aware multi-touch tabletop. Medusa uses 138 inexpensive proximity sensors to: detect a user's presence and location, determine body and arm locations, distinguish between the right and left arms, and map touch point to specific users and specific hands. Our tracking algorithms and hardware designs are described. Exploring this unique design, we develop and report on a collection of interactions enabled by Medusa in support of multi-user collaborative design, specifically within the context of Proxi-Sketch, a multi-user UI Prototyping Tool. We discuss design issues, system implementation, limitations, and generalizable concepts throughout the paper.
