Philippe JEAN-PIERRE

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• Type de publi. : Chapître d'ouvrage
• Date de publi. : 01/01/2000
• Auteurs : Pierre-Jean BenghoziPatrice FlichyPhilippe d' Iribarne
• Organismes : Centre de Recherche en Gestion Technique Innovation et Organisation (TIO) Centre de Recherche en Gestion

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2000
• Auteurs : Ludovic NoelsLaurent StainierJean-Philippe PonthotJérome Bonini
• Organismes : Laboratoire Kastler Brossel Institut de Recherche en Génie Civil et Mécanique European Organization for Nuclear Research SNECMA Villaroche [Moissy-Cramayel]

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2000
• Auteurs : Jean-Pierre L. SavardPhilippe ClergeauG. Mennechez
• Organismes : Canadian Wildlife Service Station commune de Recherches en Ichtyophysiologie, Biodiversité et Environnement Station commune de Recherches en Ichtyophysiologie, Biodiversité et Environnement
• Publié dans Landscape and Urban Planning le 27/10/2020

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Résumé : The association of biodiversity and urban ecosystems has usually concerned the impact of urbanization on biodiversity. However, biodiversity concepts can easily be applied to the urban ecosystem itself. As more and more people live in cities, restoration, preservation and enhancement of biodiversity in urban areas become important. Concepts related to biodiversity management such as scale, hierarchy, species identity, species values, fragmentation, global approaches can be used to manage urban biodiversity. Application of these concepts in such artificial ecosystems may yield important insights for the management of natural ecosystems. Birds are highly visible and quite sensitive to changes in habitat structure and composition. Bird species richness in urban ecosystems is influenced both by local and landscape characteristics and a multiscale approach is essential to its proper management. People-wildlife conflicts are an integral component of wildlife management in urban ecosystems and must be addressed. Enhancement of biodiversity in urban ecosystems can have a positive impact on the quality of life and education of urban dwellers and thus facilitate the preservation of biodiversity in natural ecosystems.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2000
• Auteurs : Philippe GaussierCédric JoulainJean-Paul BanquetSacha LepretreArnaud Revel
• Organismes : Equipes Traitement de l'Information et Systèmes Equipes Traitement de l'Information et Systèmes Plasticité cérébrale et adaptations des fonctions visuelles et motrices Equipes Traitement de l'Information et Systèmes Equipes Traitement de l'Information et Systèmes
• Publié dans Robotics and Autonomous Systems le 29/10/2020

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Résumé : In this paper, we describe how a mobile robot under simple visual control can retrieve a particular goal location in an open environment. Our model neither needs a precise map nor to learn all the possible positions in the environment. The system is a neural architecture inspired by neurobiological analysis of how visual patterns named landmarks are recognized. The robot merges these visual informations and their azimuth to build a plastic representation of its location. This representation is used to learn the best movement to reach the goal. A simple and fast on-line learning of a few places located near the goal allows this goal to be reached from anywhere in its neighborhood. The system uses only a very rough representation of the robot environment and presents very high generalization capabilities. We describe an efficient implementation of autonomous and motivated navigation tested on our robot in real indoor environments. We show the limitations of the model and its possible extensions.

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• Type de publi. : Rapport
• Date de publi. : 01/01/2000
• Auteurs : Pierre FriedlingsteinLaurent BoppPhilippe CiaisJean-Louis DufresneLaurent FairheadHervé Le TreutPatrick MonfrayJames C. Orr
• Organismes : Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] ICOS-ATC Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]

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Fichiers liés : note19.pdf

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• Type de publi. : Chapître d'ouvrage
• Date de publi. : 01/01/2000
• Auteurs : Philippe GaussierSacha LepretreMathias QuoyArnaud RevelCédric JoulainJean-Paul Banquet
• Organismes : Equipes Traitement de l'Information et Systèmes Equipes Traitement de l'Information et Systèmes Equipes Traitement de l'Information et Systèmes Equipes Traitement de l'Information et Systèmes Equipes Traitement de l'Information et Systèmes Plasticité cérébrale et adaptations des fonctions visuelles et motrices

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• Type de publi. :
• Date de publi. : 01/01/2000
• Auteurs : R. LaplanaFrédéric ZahmLaurent PietJean-Marie LescotFrançois BirgandThierry BioteauPierre BordenaveNicolas A TurpinPhilippe BontemsG. RotillonI. BarlundM. KaljonenS. TattariF. FeichtingerP. StraussR. HaverkampM. GarnierAntonio Lo PortoG. BenigniA. LeoneM.N. RipaO.M. EkloE. Romstad
• Organismes : Aménités et dynamiques des espaces ruraux Gestion environnementale et traitement biologique des déchets Institut National de la Recherche Agronomique UNIVERSITE NANTERRE FINNISH ENVIRONMENT INSTITUTE FIN BUNDESAMT FUR WASSERWIRTSCHAFT AUT Université Grenoble Alpes [2016-2019] INSTITUTO DI RICERCA SULLE ACQUE ITA Università degli studi della Tuscia = Tuscia University [Viterbo] Norwegian Crop Research Institute AGRICULTURAL UNIVERSITY OF NORWAY NOR

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Résumé : AgriBMPWater is a european research project of the 5th RTD Framework program. The launching meeting of this project took place at the Cemagref of Rennes during 5 days (September 5-9, 2000) with all the involved partners This report presents the conclusions of the main discussed topics : the research watersheds, the working organisation for each workpackage, the management of the project and the main required tasks. Finally, decisions agreed by the consortium are listed.

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2000
• Auteurs : Yves RollotSinan HaliyoStéphane RégnierL. BuchaillotJean-Claude GuinotPhilippe Bidaud
• Organismes : Laboratoire de Robotique de Paris Laboratoire de Robotique de Paris Laboratoire de Robotique de Paris Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 Laboratoire de Robotique de Paris Laboratoire de Robotique de Paris

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2000
• Auteurs : Fabrice Chane MingFranck MolinaroJean LeveauPhilippe KeckhutAlain Hauchecorne
• Organismes : Laboratoire de physique de l'atmosphère Laboratoire de physique de l'atmosphère Laboratoire de physique de l'atmosphère Service d'aéronomie Service d'aéronomie
• Publié dans Annales Geophysicae le 26/10/2020

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Résumé : The capabilities of the continuous wavelet transform (CWT) and the multiresolution analysis (MRA) are presented in this work to measure vertical gravity wave characteristics. Wave properties are extracted from the first data set of Rayleigh lidar obtained between heights of 30 km and 60 km over La Reunion Island (21°S, 55°E) during the Austral winter in 1994 under subtropical conditions. The altitude-wavelength representations deduced from these methods provide information on the time and spatial evolution of the wave parameters of the observed dominant modes in vertical profiles such as the vertical wavelengths, the vertical phase speeds, the amplitudes of temperature perturbations and the distribution of wave energy. The spectra derived from measurements show the presence of localized quasi-monochromatic structures with vertical wavelengths <10 km. Three methods based on the wavelet techniques show evidence of a downward phase progression. A first climatology of the dominant modes observed during the Austral winter period reveals a dominant night activity of 2 or 3 quasi-monochromatic structures with vertical wavelengths between 1-2 km from the stratopause, 3-4 km and 6-10 km observed between heights of 30 km and 60 km. In addition, it reveals a dominant activity of modes with a vertical phase speed of -0.3 m/s and observed periods peaking at 3-4 h and 9 h. The characteristics of averaged vertical wavelengths appear to be similar to those observed during winter in the southern equatorial region and in the Northern Hemisphere at mid-latitudes.

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Fichiers liés : angeo-18-485-2000.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2000
• Auteurs : Valérie DemarezJean-Philippe Gastellu-EtchegorryPatrick MordeletClaude ToscaGeorges MartyPierre Guillevic
• Organismes :
• Publié dans Agronomie le 26/10/2020

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Résumé : The scope of this work was to investigate the impact of the border effects and the 3-D architecture of a fallow field on: 1) its bidirectional reflectance factor (BRF); 2) its PAR (photosynthetically active radiation) regime; and, to a lesser extent, 3) on its carbon assimilation. For this purpose, laboratory BRF measurements were conducted on a sample of a fallow field. Moreover, we modified a 3-D radiative transfer model in order to simulate the visible and near infrared BRF of finite and heterogeneous media. Several scene representations were used (finite and infinite scenes with/without 1-D or 3-D distribution of leaf area index [LAI]). Results showed that border effects and LAI distribution strongly affect the BRF, with variations as large as 40% depending on the scene representations and on the spectral domain. PAR profiles and instantaneous canopy carbon assimilation of an infinite scene (natural conditions) were also studied with the 3-D model. The results stressed that, in the case of a fallow field, the use of a simple LAI profile provides enough information to accurately simulate the effects of the architecture on the PAR regime and the carbon assimilation of a fallow field.

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Fichiers liés : hal-00886020.pdf

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