Philippe JEAN-PIERRE

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2000
• Auteurs : Pierre-Yves LéoJean Philippe
• Organismes : Centre d'Études et de Recherche en Gestion d'Aix-Marseille SBM offshore
• Publié dans Cahiers de géographie du Québec le 24/10/2020

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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. : Article dans une revue
• Date de publi. : 01/01/2000
• Auteurs : Gilles Arnaud-FassettaJacques-Louis de BeaulieuJean-Pierre SucMireille ProvansalDavid WilliamsonPhilippe LeveauJ.-C. AloïsiF. GadelP GiresseJ. EvinD. Duzer
• Organismes : Pôle de recherche pour l'organisation et la diffusion de l'information géographique Institut Méditerranéen d'Ecologie et de Paléoécologie PaleoEnvironnements et PaleobioSphere Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement Centre Camille Jullian - Histoire et archéologie de la Méditerranée et de l'Afrique du Nord de la protohistoire à la fin de l'Antiquité
• Publié dans Geodinamica Acta le 25/10/2020

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2000
• Auteurs : Philippe TaconJean-François BaroillerPierre-Yves Le BailPatrick PrunetBernard Jalabert
• Organismes : Station commune de Recherches en Ichtyophysiologie, Biodiversité et Environnement Programme système de Production Animale IDESSA BOUAKE CIV Station commune de Recherches en Ichtyophysiologie, Biodiversité et Environnement Station commune de Recherches en Ichtyophysiologie, Biodiversité et Environnement Station commune de Recherches en Ichtyophysiologie, Biodiversité et Environnement
• Publié dans General and Comparative Endocrinology le 25/10/2020

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Résumé : Various hormones were analyzed during the course of a reproductive cycle in the cichlid fish Oreochromis niloticus: plasma levels of the gonadal steroids 17 beta-estradiol (E2), testosterone (T), 17,20 beta-OH progesterone (17,20 beta; P), gonadotropin (taGtH), and plasma and pituitary concentrations of prolactin (tiPRL(I) and tiPRL(II)) and growth hormone (tiGH). Two categories of fish were sampled and sacrificed on days 1 and 3 postspawning and at 3-day intervals thereafter: typical incubating females (INC), and nonincubating females (NI), deprived of their eggs just after spawning. Such deprivation is known to suppress maternal behavior and to accelerate ovarian development and especially vitellogenesis, thus shortening the mean interspawning interval. In both groups, variations of the plasma concentrations of E2 and T appeared to depend on ovarian stages, and differences between groups appeared to reflect underlying differences in the kinetics of ovarian development. The observation of noticeable levels of 17,20 beta-P in plasma before spawning, when high values of taGtH could also be detected in NI females, suggests the implication of this progestin in the control of final maturation events, as in some other teleosts. Moreover, 17,20 beta-P, which was still detected a few days after spawning, but at low concentrations and only in the plasma of INC females, might play a role at the beginning of the reproductive cycle in incubating females (maternal behavior and/or slowing down of ovarian growth). The pituitary and plasma profiles of both tiPRLs isoforms appeared to depend mainly on the kinetics of ovarian development in each group of fish, suggesting a role during the beginning of vitellogenesis. However, the variance of plasma tiPRL(II), which was significantly enhanced during maternal behavior in INC females, also suggests an implication of this hormone in the control of that behavior. Concerning tiGH, comparison of the plasma profiles in INC and NI fish also suggest an influence on the control of maternal behavior, but a main effect of starvation of INC during mouthbrooding cannot be excluded.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2000
• Auteurs : Paul FontaynePhilippe SarrazinJean-Pierre Famose
• Organismes : Laboratoire de Psychologie des Pratiques Physiques Sport et Environnement Social Mouvement, Équilibre, Performance, Santé
• Publié dans European Review of Applied Psychology / Revue Européenne de Psychologie Appliquée le 23/10/2020

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Résumé : Examined the validity and reliability of a French short version of the Bem Sex-Role Inventory (S. Bem, 1974, BSRI) for adolescents, and the organization of gender-related self-schemata. Four studies involving 1,204 adolescents (average ages 14.91, 15.60, and 15.38 yrs) residing in France were carried out to translate BSRI items and evaluate their clarity; assess concurrent validity, construct validity, and reliability; and analyze the psychological construct correlates and produce statistical norms. Results show a positive linkage between masculinity and sports practice on the 1 hand, and self-esteem on the other. Femininity was negatively linked to self-esteem and sports practice. Factor analysis confirmed correlations between gathered data and theoretical constructs. There was a general lack of connection between the subscales. The questionnaire demonstrated sufficient internal consistency and test-retest reliability.

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Fichiers liés : Fontayne_etal_ERAP2000.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2000
• Auteurs : Sylvie DurandJean-Pierre DognonPhilippe GuilbaudCatherine RabbeGeorges Wipff
• Organismes : Département de recherche sur les procédés pour la mine et le recyclage du combustible Département de recherche sur les procédés pour la mine et le recyclage du combustible Département de recherche sur les procédés pour la mine et le recyclage du combustible Commissariat à l'énergie atomique et aux énergies alternatives Département de recherche sur les procédés pour la mine et le recyclage du combustible Université Louis Pasteur - Strasbourg I
• Publié dans Journal of the Chemical Society, Perkin Transactions 2 le 26/10/2020

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2000
• Auteurs : Jean-Paul BanquetYves BurnodPhilippe GaussierArnaud Revel
• Organismes : Plasticité cérébrale et adaptations des fonctions visuelles et motrices Réseau National des Systèmes Complexes Equipes Traitement de l'Information et Systèmes Equipes Traitement de l'Information et Systèmes

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Résumé : Visually guided landmark navigation is based on space coding by hippocampal place cells (Pc)[2]. A biologically realistic architecture of cooperative-competitive associative networks (implemented as a control system for mobile agents) emulates place cell activity during local navigation (self and goal -localization, and route finding) in exploration and goal-retrieval paradigms. The system builds and stores panoramic views from landmarks and compares these views with current inputs. Mismatch induced low levels of recognition activity during exploration trigger a vigilance burst (by a mechanism inspired from septal modulation) which favors either the recognition of an alternative place category, or the creation of a new category. The sole implementation of visual ¿What¿ and ¿Where¿ information does not restrain the generality of the model since several modalities (proprioceptive and vestibular in particular) could cooperate to give rise to more robust place field spatial categories [5]. Providing the system with real visual inputs automatically extracted from a natural environment demonstrates that interspecies differences [6] in Pc coding (e.g. Pcs in rats vs. view cells in monkeys) result more from characteristics of the visual systems than from differences in Hs processing. Conversely, differences in Pc multiple codes within the same system result according to the model from different levels of processing and/or different degrees of multimodality. Each of these codes could be used within different navigational strategies a control system directly derived from the model allows a mobile agent to learn a few places in an environment, and their associated actions to perform in order to reach a goal. Generalization property of the model provides the capacity to join the goal from any place in the learned environment.

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2000
• Auteurs : Jean-Paul BanquetPhilippe GaussierArnaud RevelYves Burnod
• Organismes : Plasticité cérébrale et adaptations des fonctions visuelles et motrices Equipes Traitement de l'Information et Systèmes Equipes Traitement de l'Information et Systèmes Réseau National des Systèmes Complexes

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2000
• Auteurs : Vincent BabeauPhilippe GaussierCédric JoulainArnaud RevelJean-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 Plasticité cérébrale et adaptations des fonctions visuelles et motrices

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2000
• Auteurs : Jean-Pierre AllegretPhilippe Dulbecco
• Organismes : Groupe d'analyse et de théorie économique Groupe d'analyse et de théorie économique

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