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45 results on '"Gayraud, T."'

1. SATSIX: A Network Architecture for Next-Generation DVB-RCS Systems

Author

Fan, L., Baudoin, C., Rodriguez, F., Ramos, A., Guerra, J. A., de La Cuesta, B., Fairhurst, G., Sathiaseelan, A., Berthou, P., Gayraud, T., Liang, L., Yun, A., Callejo, E., Melhus, I., Iyengar, S., Cruickshank, H., Sun, Z., Fan, Linghang, editor, Cruickshank, Haitham, editor, and Sun, Zhili, editor

Published
2008
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6. Addressing the Challenge of Distributed Interactive Simulation With Data Distribution Service

Author

Akram Hakiri, Berthou, P., Gayraud, T., Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université de Toulouse (UT)

Subjects
Networking and Internet Architecture (cs.NI), FOS: Computer and information sciences, Computer Science - Networking and Internet Architecture, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], SISO, SCS
Abstract

International audience; Real-Time availability of information is of most importance in large scale distributed interactive simulation in network-centric communication. Information generated from multiple federates must be distributed and made available to interested parties and providing the required QoS for consistent communication. The remainder of this paper discuss design alternative for realizing high performance distributed interactive simulation (DIS) application using the OMG Data Distribution Service (DDS), which is a QoS enabled publish/subscribe platform standard for time-critical, data-centric and large scale distributed networks. The considered application, in the civil domain, is used for remote education in driving schools. An experimental design evaluates the bandwidth and the latency performance of DDS and a comparison with the High Level Architecture performance is given.

Published
2010

7. Survey study of the QoS Management in Distributed Interactive Simulation Through Dead Reckoning Algorithms

Author

Akram Hakiri, Berthou, P., Gayraud, T., Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université de Toulouse (UT)

Subjects
Computer Science - Networking and Internet Architecture, Distributed Interactive Simulation (DIS), Networking and Internet Architecture (cs.NI), FOS: Computer and information sciences, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Dead Reckoning Algorithm, QoS Management. ANFIS Model, SISO, SCS
Abstract

International audience; Dead Reckoning mechanism allows reducing the network utilization considerably when used in Distributed Interactive Simulation Applications. However, this technique often ignores available contextual information that may be influential to the state of an entity, sacrificing remote predictive accuracy in favor of low computational complexity. The remainder of this paper focuses on the analysis of the Dead Reckoning Algorithms. Some contributions are expected and overviews of the major bandwidth reduction techniques currently investigated are discussed. A novel extension of Dead Reckoning based on ANFIS systems is suggested to increase the network availability and fulfilling the required QoS in such applications. The model shows it primary benefits regarding the other research contributions, especially in the decision making of the behavior of simulated entities.

Published
2010
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14. Miniaturized Wireless Sensor Networks

Author

Lecointre, A., primary, Dragomirescu, D., additional, Dubuc, D., additional, Grenier, K., additional, Pons, P., additional, Aubert, A., additional, Muller, A., additional, Berthou, P., additional, Gayraud, T., additional, and Plana, R., additional

Published
2006
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24. PLATINE: DVB-S2/RCS Enhanced Testbed for Next Generation Satellite Networks.

Author

Fan, Linghang, Cruickshank, Haitham, Sun, Zhili, Baudoin, C., Dervin, M., Berthou, P., Gayraud, T., Nivor, F., Jacquemin, B., Barvaux, D., and Nicol, J.

Abstract

Emulation is a cost effective and efficient tool to perform performances evaluation and innovative access and network techniques validation. Its ability to interconnect real equipments with real applications provides excellent demonstrations means. The main problem is to overcome the emulation weakness which is the accuracy of the model reproducing the systems to be evaluated. Owing to its modular design and implementation, the PLATINE satellite emulation platform, presented in this paper, is able to emulate a complete DVB-RCS (Digital Video Broadcasting — Return Channel via Satellite)- DVB-S2 (Digital Video Broadcasting — Second) system in a realistic and flexible way. It is possible to configure the platform to emulate a transparent DVB-RCS system dimensioned around a single Hub, or to emulate a system using a regenerative satellite with an onboard switching matrix. Different DVB-RCS protocol stacks are implemented, and the adaptive physical layer is emulated in real time thanks to precalculated DRA schemes and MODCOD files. A DiffServ-like QoS Architecture that couples MAC and IP-Layer QoS mechanisms and Layer 2 security framework are currently under development. At the network side, IPv4 and IPv6 are fully supported as well as IPv6 mobility and dynamic multicast. In this paper, we mainly focus on the emulation platform and the tools developed to help the performance analysis of the emulated system. [ABSTRACT FROM AUTHOR]

Published
2008
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25. A Novel QoS Architecture for Next Generation Broadband Satellite Systems.

Author

Fan, Linghang, Cruickshank, Haitham, Sun, Zhili, Ramos, A., de La Cuesta, B., Carro, B., Aguiar, J., Pérez, D., Baudoin, C., Berthou, P., Abdellatif, S., and Gayraud, T.

Abstract

This paper presents the architecture developed in Satsix project in order to improve the current QoS level in satellite/terrestrial networks. The dynamic QoS support is one of the major achievement of SATSIX in the QoS area, with the extension of the QoS agent/server architecture proposed in the previous SATIP6 project. This QoS architecture is based on DiffServ architecture, and it has been proposed aiming to tackle different QoS level sessions. [ABSTRACT FROM AUTHOR]

Published
2008
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26. Cross-Layer Anticipation of Resource Allocation for Multimedia Applications Based on SIP Signaling over DVB-RCS Satellite System.

Author

Fan, Linghang, Cruickshank, Haitham, Sun, Zhili, Nivor, F., Gineste, M., Baudoin, C., Berthou, P., and Gayraud, T.

Abstract

This paper introduces a cross-layer approach for improving QoS guaranties to interactive multimedia applications over an efficient satellite access assignment scheme (on-demand). It particularly focuses on the communication opening which represents the weakness of on-demand capacity allocation in the satellite context (due to significant delays). It finally presents experimental results of the various proposed enhancements. [ABSTRACT FROM AUTHOR]

Published
2008
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27. SATSIX Mobility Architecture and Its Performance Evaluation.

Author

Fan, Linghang, Cruickshank, Haitham, Sun, Zhili, Melhus, I., Arnal, F., Gayraud, T., and Jacquemin, B.

Abstract

As wireless and satellite networks become widely used, new ways to think communication can be envisaged. In particular, a greater degree of connectivity is almost becoming a necessity for the users on the go, being connected whatever their locations are. Different definitions of mobility are emerging, and in SATSIX three mobility scenarios are defined, namely discrete mobility, continuous mobility and seamless mobility. Next, two mobility contexts; macro-mobility and micromobility, according to network hierarchy have been considered. To improve the mobility management, and reducing signaling overhead and handover delay when using MIPv6, the enhancement protocols HMIPV6, FMIPv6 and the combination FHMIPv6 are investigated. Application mobility is analyzed as a complement to network layer mobility. The project also addresses the impacts on several others key networking functions like multicast, QoS and PEP. [ABSTRACT FROM AUTHOR]

Published
2008
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38. Cross-layer optimization in the next-generation broadband satellite systems

Author

Melhus, I, Fan, L, Arnal, F, Baudoin, C, Nivor, F, Gayraud, T, Berthout, P, Fairhurst, G, Fiaschetti, A, Pietrabissa, A, Pimpinella, L, Lei, L, Cruickshank, Haitham, and Sun, Zhili

Subjects
Engineering, Satellite system, business.industry, Broadband networks, Resource management, Quality of service, Distributed computing, Mobility management, Cross-layer optimization, Robustness (computer science), Broadband, Electronic engineering, Architecture, business
Abstract

Next-generation broadband satellite systems will have the capability to provide cost-effective universal broadband access for the users. In order to meet users’ requirements on high quality multimedia services, many enhancements have to be made on the existing satellite technologies. One of the promising methods is the introduction of cross-layer design. There are several advantages of a layered approach since modularity, robustness and ease of designs are achieved without difficulty. However the properties of the different layers have substantial interdependencies and a modularised design may therefore be suboptimal with regards to performance and availability in a hybrid satellite and mobile wireless environment. In this paper, we will carry out a review of the cross-layer design in satellite systems. Based on this, a cross-layer architecture for the next-generation broadband satellite system is proposed. The proposed cross-layer architecture has two main components: QoS and resource management and mobility management. In each component, the cross-layer techniques that have been used are described in details.

44. Terminal-repeat retrotransposons with GAG domain in plant genomes: a new testimony on the complex world of transposable elements.

Author

Chaparro C, Gayraud T, de Souza RF, Domingues DS, Akaffou S, Laforga Vanzela AL, Kochko Ad, Rigoreau M, Crouzillat D, Hamon S, Hamon P, and Guyot R

Subjects
Algorithms, Base Sequence, Conserved Sequence genetics, Gene Dosage, Markov Chains, Molecular Sequence Annotation, Molecular Sequence Data, Multigene Family, Transcription, Genetic, Coffea genetics, Genome, Plant, Retroelements genetics, Terminal Repeat Sequences genetics
Abstract

A novel structure of nonautonomous long terminal repeat (LTR) retrotransposons called terminal repeat with GAG domain (TR-GAG) has been described in plants, both in monocotyledonous, dicotyledonous and basal angiosperm genomes. TR-GAGs are relatively short elements in length (<4 kb) showing the typical features of LTR-retrotransposons. However, they carry only one open reading frame coding for the GAG precursor protein involved for instance in transposition, the assembly, and the packaging of the element into the virus-like particle. GAG precursors show similarities with both Copia and Gypsy GAG proteins, suggesting evolutionary relationships of TR-GAG elements with both families. Despite the lack of the enzymatic machinery required for their mobility, strong evidences suggest that TR-GAGs are still active. TR-GAGs represent ubiquitous nonautonomous structures that could be involved in the molecular diversities of plant genomes., (© The Author(s) 2015. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.)

Published
2015
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45. The coffee genome provides insight into the convergent evolution of caffeine biosynthesis.

Author

Denoeud F, Carretero-Paulet L, Dereeper A, Droc G, Guyot R, Pietrella M, Zheng C, Alberti A, Anthony F, Aprea G, Aury JM, Bento P, Bernard M, Bocs S, Campa C, Cenci A, Combes MC, Crouzillat D, Da Silva C, Daddiego L, De Bellis F, Dussert S, Garsmeur O, Gayraud T, Guignon V, Jahn K, Jamilloux V, Joët T, Labadie K, Lan T, Leclercq J, Lepelley M, Leroy T, Li LT, Librado P, Lopez L, Muñoz A, Noel B, Pallavicini A, Perrotta G, Poncet V, Pot D, Priyono, Rigoreau M, Rouard M, Rozas J, Tranchant-Dubreuil C, VanBuren R, Zhang Q, Andrade AC, Argout X, Bertrand B, de Kochko A, Graziosi G, Henry RJ, Jayarama, Ming R, Nagai C, Rounsley S, Sankoff D, Giuliano G, Albert VA, Wincker P, and Lashermes P

Subjects
Caffeine biosynthesis, Coffea classification, Methyltransferases genetics, Phylogeny, Plant Proteins genetics, Caffeine genetics, Coffea genetics, Evolution, Molecular, Genome, Plant, Methyltransferases physiology, Plant Proteins physiology
Abstract

Coffee is a valuable beverage crop due to its characteristic flavor, aroma, and the stimulating effects of caffeine. We generated a high-quality draft genome of the species Coffea canephora, which displays a conserved chromosomal gene order among asterid angiosperms. Although it shows no sign of the whole-genome triplication identified in Solanaceae species such as tomato, the genome includes several species-specific gene family expansions, among them N-methyltransferases (NMTs) involved in caffeine production, defense-related genes, and alkaloid and flavonoid enzymes involved in secondary compound synthesis. Comparative analyses of caffeine NMTs demonstrate that these genes expanded through sequential tandem duplications independently of genes from cacao and tea, suggesting that caffeine in eudicots is of polyphyletic origin., (Copyright © 2014, American Association for the Advancement of Science.)

Published
2014
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