Tesis sobre el tema "Dynamique de groupes"
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Hilion, Arnaud. "Dynamique des automorphismes des groupes libres". Toulouse 3, 2004. http://www.theses.fr/2004TOU30246.
Texto completoThis thesis is dedicated to the study of the dynamics of the homeomorphism induced by an automorphism of the free group on its boundary. I focus on automorphisms such that the periodic points of the induced homeomorphism are fixed points (every automorphism has a power with this property). I prove that the set of accumulation points of the sequences obtained by iterating the homeomorphism on a point of the boundary which is not fixed, is finite up to the action of the fixed subgroup by left translations. Moreover, when such a point is in the boundary of the fixed subgroup, i prove that it is rational. I define a new invariant for an automorphism of the free group: its dynamical graph. I give an example of an automorphisme of the free group of rank 4 with a parabolic orbit. Besides, i prove that the stabilizer of an attractive fixed point of an irreducible, with irreducible powers, automorphism is infinite cyclic. I deduce that, for the free group of rank 2, the stabiliser of a point in the boundary, which is not rational, is either trivial or infinite cyclic; and i give, up to isomorphism, the list of groups obtained as stabilizer of a point in the boundary
Heu, Jean-Romain. "Dynamique des actions de semi-groupes d'endomorphismes sur des nilvariétés". Rennes 1, 2010. http://www.theses.fr/2010REN1S034.
Texto completoThe dynamical properties of automorphism groups acting on tori have been widely studied. Nilpotent real Lie groups are a first generalization of abelian real Lie groups. Their quotients by lattices are called nilmanifolds. They generalize the notion of torus. In this thesis, we study the action of groups and semigroups of endomorphisms of some nilmanifolds, such as Heisenberg nilmanifolds. We describe three dynamical aspects of these actions : the density of orbits, the set of invariant measures and the existence of a spectral gap for operators on the L²-spaces associated to the nilmanifolds
Monclair, Daniel. "Dynamique lorentzienne et groupes de difféomorphismes du cercle". Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2014. http://tel.archives-ouvertes.fr/tel-01061010.
Texto completoMiliton, Emmanuel. "Fragmentation et propriétés algébriques des groupes d'homéomorphismes". Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00752638.
Texto completoIsnard, Olivier. "Dispersion atmosphérique en présence de groupes d'obstacles". Ecully, Ecole centrale de Lyon, 1999. http://www.theses.fr/1999ECDL0013.
Texto completoMuch research has been devoted to modelling mesoscale atmospheric boundary layer flows and flows at the scale of individual streets, but much less attention has been focussed on flow and dispersion at intermediate scales, such as small town or a large suburban area. An important problem in the computational modelling of such flows is the representation of the urban surface layer. At typical scales used in such calculations, it is not feasible to model individual buildings, but neither is it possible to represent the effects of the buildings by a simple change in roughness length. Geographical information Systems now provide us with a highly detailed description of the urban topography, but, paradoxically, these descriptions are too detailed to be used directly. The challenge is therefore to find ways to simplify the data, so that they can be used in pratical calculations of flow and dispersion in urban areas. This is the objective of the research presented here. In order to develop simple parametrisations for the influence of a group of buildings on flow and dispersion in the urban canopy, we need first to identify and underrstand the major processus. In particular, we need to understand how parameters such as the geometrical organisation, the obstacles, the spacing between them, their size and the overall extent of the group interact to influence the flow and the dispersion. We have use three different approaches to investigate this. Firstly, experiments were performed in an atmospheric wind tunnel, for several different configurations of obstacles. Fluid velocities were measured using LDV, and gas concentrations were measured using FID. Secondly, three dimensional calculations have been performed using the atmospheric dispersion code MERCURE initially developed by EDF. Finally a simplified model for flow and dispersion within a group of obstacles was developed based on a potential flow approach. These three methods have been used to investigate and explain some of the fundamental processus involved in flow and dispersion through groups of obstacles
Coat, Françoise. "Mémoire de groupe et collecticiels : le cas des équipes distribuées". Grenoble 2, 1995. http://www.theses.fr/1995GRE21029.
Texto completoIn organizations, the concept of distributed teamwork is more and more common. People have to coordinate their jobs to a chieve their shared goals. To do it, they shared information and they communicate, anywhere and anytime. To this purpose, we present a new model of group memory achieved through groupware. This new model includes : a survey o f the data shared by the teams and a description of how these data are processed. Three longitudinal studies in three different companies have been made. Here are the results : - group memory increases oral communication between team members. - group memory enhance electronic communication tools (messages stay permanently). - the physical model of group memory is composed by a shared data base (semantic memory and episodic memory) and by groupware tools (working memory for people)
Guay, Pascal. "Modèle dynamique des mécanismes". Lyon, INSA, 1989. http://www.theses.fr/1989ISAL0003.
Texto completoDang, Nguyen-Thi. "Dynamique d'action de groupes dans des espaces homogènes de rang supérieur et de volume infini". Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1S051/document.
Texto completoLet G be a semisimple Lie group (of higher rank) and Γ a Zariski dense subgroup of G (of infinite covolume). In this thesis, we discuss two questions related to the Benoist limit cone of Γ : one concerns random walks, the other topological mixing of the directional Weyl chamber flow. In the introduction, we state the main results of this thesis in their context. In the second chapter, we recall some general facts about Lie groups and loxodromic elements. In the third chapter, we prove that every point of the interior of the limit cone is a Lyapunov vector. In the fourth chapter, we construct local coordinates of G and give key tools for the remaining parts. In the fifth chapter, we introduce the invariant subsets of G. In the last chapter of this thesis, we prove the topological mixing criterion of regular directional Weyl chamber flow obtained with O. Glorieux and we generalize this criterion to Γ\G for a class of Lie groups including SL(n, R), SL(n, C), SO(p, p + 2)
Breymann, Wolfgang. "Phases plastiques, theorie des groupes et dynamique moleculaire : deux applications". Paris 6, 1987. http://www.theses.fr/1987PA066150.
Texto completoBOUDJADA, FAHIMA. "Etude des trihalogenomesitylenes : structure, vibrations moleculaires dynamique des groupes methyles". Rennes 1, 1999. http://www.theses.fr/1999REN10128.
Texto completoBreymann, Wolfgang. "Phases plastiques, théorie des groupes et dynamique moléculaire deux applications /". Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37603447v.
Texto completoDubois, Nicole. "La formation des attitudes politiques dans un groupe social : le cas des enseignants du secondaire". Lille 1, 1993. http://www.theses.fr/1993LIL12009.
Texto completoTeachers show a comparatively high interest in politics and most of them vote for the leftwing : which founder myths belong to the subjective world of the teachers in the secondary education ? which part is due to the individual, which part is due to the group, in the keeping of the political tradition associated with this particular sphere? so many questions that neither the recourse to history nor the study of the sociological constituting of the teaching profession, essentiels as their contributions are, suffice to clear up. The investigation, conducted among 56 teachers by means of no directing interviews, plays at once a great part in the knowledge of this social group : the qualitative analysis of the symbolic organisations in force in the teaching spere makes apparent four logics of perceptions, revealing the different teaching subcultures and sensibilities, and beyond which a common trunk of attitudes is taking shape. But the research also runs over the wider field of the political socialization, asking the question of the process of the formation, the transformation, and the handing down of symbolic systems : the study of the political itineraries emphasizes the importance of the prime socialization
Dospinescu, Sanda. "Mosaïque urbaine et mouvements sociaux, la dynamique spatiale des groupes populaires". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60713.pdf.
Texto completoDenoun, Philippe. "La mise en œuvre de la dimension communautaire". Paris 7, 2000. http://www.theses.fr/2000PA070121.
Texto completoThe implementation of the communal pattern within the contractual groups (corporate ethnology) describes the process which aggregates the members of a group linked by an "undertaking". The author makes the hypothesis that the implicit contract, which in a cultural level, aggregates the identified members of a group (by themselves, by their contacts, or by the outside), "organizes" the identity of the project. Whether this concerns a company, an association, or an institution, this human dimension is necessary for understanding and reorienting the organization through and in its foundations, constraints, its dynamics. Identity and culture being the two axes for understanding the ethnos of the group, the approach is fundamentally anthropologic but is nourished by many disciplines which describe culture (history, aesthetic, literature, semiology) and by other which question and bring into question the meaning (psychoanalysis, organization disciplines, marketing,. . . )
Palesi, Frédéric. "Dynamique sur les espaces de représentations de surfaces non-orientables". Phd thesis, Grenoble 1, 2009. http://www.theses.fr/2009GRE10317.
Texto completoWe consider the space of representations Hom(Pi,G) of a surface group Pi into a Lie group G, and the moduli space X(Pi,G) of G-conjugacy classes of such representations. These spaces admit a natural action of the mapping class group of the underlying surface S, and this actions displays very rich dynamics depending on the choice of the Lie group G, and on the connected component of the space that we consider. In this thesis, we focus on the case when S is a non-orientable surface. In the rst part, we study the dynamical properties of the mapping class group actions on the moduli space X(Pi,SU(2)) and prove that this action is ergodic when the Euler characteristic of the surface is less than -1 with respect to a natural measure on the space. In the second part, we show that the representation space Hom (Pi , PSL(2,R)) has two connected components indexed by a Stiefel-Whitney class
Palesi, Frédéric. "Dynamique sur les espaces de représentations de surfaces non-orientables". Phd thesis, Université Joseph Fourier (Grenoble), 2009. http://tel.archives-ouvertes.fr/tel-00443930.
Texto completoClety, Henry. "Dynamique des représentations et efficacité dans les systèmes "équipe de travail"". Lille 3, 2009. http://www.theses.fr/2009LIL30041.
Texto completoThe study of the concept of working team is recent in psychology, but also rich and polymorphic. The analysis of the knowledge established on this concept to a re-articulation of the notions, which are associated with him, and in an epistemological and paradigmatically fundamental reflection on the contribution of the cybernetic and the systemic, in the study of the teamwork. The first approach of reflection ends in the formulation of a model of analysis, which repositions the notions of efficiency and dynamics of team with regard to the new notion of system of representations of the members of team. From then on, the general problem concerns the distances and the dynamics of the team and its efficacy. Three researches here presented allow to confirm the existence of his link, in particular under the angle of the relation between the members and their manager. So, as far as their representations of the system converges on and are close, it establishes an observation positively associated with the dynamics of their team and with its efficiency. This observation is more significant from the point of view of the dynamics then of the efficacy. Beyond the significant theoretical contributions, these works allow to criticize the epistemological and methodological, composed frame and to advance new perspectives of researches on the teamwork. Besides, an opening in the praxis is proposed in final exercice
Gaboriau, Damien. "Dynamique des systèmes d'isométries et actions de groupes sur les arbres réels". Toulouse 3, 1993. http://www.theses.fr/1993TOU30099.
Texto completoCorrea, Khassoum. "Réponse des groupes fonctionnels de phytoplancton à la dynamique du plateau sénégalais". Electronic Thesis or Diss., Brest, 2023. http://theses-scd.univ-brest.fr/2023/These-2023-SML-Oceanographie_physique_et_environnement-CORREA_Khassoum.pdf.
Texto completoWater color sensors measure upward radiation that includes contributions from the sea and atmosphere. We have adapted an atmospheric correction algorithm, SOM-NV, to raw observations from the MODIS-Aqua sensor over the West African ocean region, to generate aerosol and water properties simultaneously. The observed optical thickness values are better represented by SOM-NV processing than by standard MODIS (STD). At the same time, SOM-NV marine reflectances (Rrs) are more consistent with signal theory than STD Rrs. SOM-NV improves coverage by up to 35% at certain times of the year. Coverage is best at the coast and south of Cape Verde. Observations in Chla show coastal maxima that extend offshore according to season and latitude. The region is marked by alternating classes of reflectance anomaly that characterize phytoplankton communities. Most classes are associated with pigment mixtures characteristic of functional groups. An algal class close to brown algae and another to green algae dominate in autumn and early winter. From February to May, brown algae classes are very present and associated with high biomass. They alternate with a mixed class associated with the pigments fucoxanthin 19'HF and chlorophyll-b. This class seems to be favored when biomasses are lower
Curtillet, Jean-Christophe. "Géodésiques sur des surfaces plates à singularités coniques ; une fonction zéta pour des automorphismes de groupes libres". Université Louis Pasteur (Strasbourg) (1971-2008), 1998. http://www.theses.fr/1998STR13025.
Texto completoSleebos, Edwin Paul. "Consequences of perceived intra-group respect /". [S.l. : s.n], 2005. http://catalogue.bnf.fr/ark:/12148/cb40179973z.
Texto completoKrieger, Fabrice Coornaert Michel. "Sur les invariants topologiques des actions de groupes moyennables discrets". Strasbourg : Université Louis Pasteur, 2006. http://eprints-scd-ulp.u-strasbg.fr:8080/525/01/theseKrieger2006.pdf.
Texto completoEskif, Anas. "Théorie de la mesure dans la dynamique des sous-groupes de Diff^w(S1)". Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30151/document.
Texto completoIn this thesis we establish a topological rigidity theorem for a large class of subgroups of the group Diff (S1) consisting of (orientation-preserving) real analytic diffeomorphisms of the circle S1. Indeed, the primary object studied in this thesis are finitely generated, locally C 2-non-discrete subgroups of Diff (S1). In the first Chapter, we briefly recall several basic facts in the relation between measure theory and dynamical systems and recall the definitions and basic properties of hyperbolic spaces, hyperbolic groups and their boundaries. The second Chapter contains accurate definitions for most of the notions relevant for this thesis, revisits results related to Shcherbakov-Nakai theory in a form adapted to our needs and provides a description of the topological dynamics associated with a locally C 2-non-discrete subgroup of Diff (S1). The third Chapter is devoted to proving Theorem A "topological rigidity theorem". In the first section of this chapter, we prove Theorem A in various special cases, including the case where the group has a finite orbit as well as the case in which the group is solvable but non-abelian. It will then prove Theorem A in the case called "generic" and this will be the subject of the remainder of this chapter. In the second section of this chapter, we construct an explicit sequence of diffeomorphisms in G1 converging to the identity in the C 2-topology on the interval I C S1. In the last section of this chapter, we shall prove Theorem A modulo Proposition 3.3.3. In fact, Theorem 3.3.1 will be proved and this theorem provides a statement fairly stronger than what is strictly needed to derive Theorem A. The main statement in the fourth Chapter is Theorem 4.2.1. The proof of The- orem 4.2.1 is combined standard facts about hyperbolic groups with the existence of a measure µ on G1 giving rise to an absolutely continuous stationary measure. This theorem will lead to the proof of Theorem B. In the end, the Appendix contains a partial answer in the analytic category to a question raised in [De]. The appendix then ends with a summary of the role played by the regularity assumption (C) in this thesis
Gharout, Saïd. "Sécurité des communications dans les groupes dynamiques". Compiègne, 2009. http://www.theses.fr/2009COMP1841.
Texto completoGroup-oriented services are among the emerging technologies of the last few years. The advantages of using IP multicast in group communications, such as saving bandwidth, simplicity and efficiency are typically interesting for new services combining voice, video and text over Internet. Group key management, which is an important building block in securing group communications, has received a particular attention in both academic and industry research communities. This is due to the economical relevance of group-based applications, such as video on demand, videoconferencing, collaborative work. The key management concerns the distribution and updates of the key material each time a member joins or leaves the group. The dynamic aspect of group applications due to free membership joins and leaves in addition to members' mobility makes difficult the design of efficient and scalable key management protocols. In this thesis we deal with the security issue of communication in dynamic groups. We present a detailed analysis of the problem while highlighting special features and issues inherent to the group communication nature. Then, we review existing solutions in the literature and analyze their advantages and shortcomings. Finally, we provide our own original proposals, depicting their advantages over the existing solutions
Nguyen, Van Thé Lionel. "Théorie de Ramsey structurale des espaces métriques et dynamique topologique des groupes d'isométries". Phd thesis, Université Paris-Diderot - Paris VII, 2006. http://tel.archives-ouvertes.fr/tel-00139239.
Texto completoNguyen, Van The Lionel. "Théorie de Ramsey structurale des espaces métriques et dynamique topologique des groupes d'isométries". Paris 7, 2006. http://www.theses.fr/2006PA077014.
Texto completoTHE PURPOSE OF THIS THESIS IS TO INVESTIGATE THE INTERACTIONS BETWEEN THE GEOMETRY OF COMPLETE SEPARABLE ULTRAHOMOGENEOUS METRIC SPACES, THE STRUCTURAL RAMSEY THEORY OF FINITE METRIC SPACES AND THE THEORY Ol TOPOLOGICAL GROUPS TOGETHER WITH THEIR CONTINUOUS ACTIONS ON COMPACT SPACES. THE FIRST CHAPTER IS DEVOTED TO THE DESCRIPTION OF SEVERAL CLASSES OF FINITE METRIC SPACES CHARACTERIZED BY THE EXISTENCE OF A REMARKABLE CANONICAL OBJECT CALLED 'URYSOHN SPACE1. THE SECOND CHAPTER IS DEVOTED TO THE STUDY OF SEVERAL COMBINATOR1AL PROPERTIES (CALLED RAMSEY PROPERTY AND ORDERING PROPERTY) OFTHE CLASSES PRESENTED IN THE FIRST CHAPTER. THE IMPLICATIONS OFTHOSE PROPERTIES AT THE LEVEL OF THE URYSOHN SPACES AND THEIR ISOMETRY GROUP ARE THEN PRESENTED. IN PARTICULAR A GENERAL AND RECENT THEORY DUE TO KECHRIS, PESTOV AND TODORCEVIC IS USED TO COMPUTE A DYNAMICAL INVARIANT, NAMELY THE UNIVERSAL MINIMAL FLOW, ATTACHED TO SEVERAL TRANSFORMATION GROUPS. FINALLY, THE THIRD CHAPTER IS DEVOTED TO THE STUDY OF THE SO CALLED INDIVISIBILITY PROPERTIES OF THE URYSOHN SPACES. IN PARTICULAR, THE ULTRAMETRIC CASE IS COMPLETELY SOLVED AND A COMBINATORIAL REFORMULATION OF AN ANALOG OF THE DISTORTION PROBLEM FOR THE SEPARABLE HILBERT SPACE IS OBTAINED IN THE OPEN CONTEXT OF THE UNIVERSAL URYSOHN SPACE
Matte, Bon Nicolás. "Propriété de Liouville, entropie, et moyennabilité des groupes dénombrables". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS087.
Texto completoThis thesis deals with the Liouville property and amenability of topological full groups of Cantor systems, groups of interval exchanges, and groups acting on rooted trees. In Chapter 2, we provide the first examples of finitely generated, infinite simple groups that have trivial Poisson-Furstenberg boundary for simple random walks (the Liouville property). These arise as the derived subgroup of the topological full groups of a family of minimal subshifts. We show that if the complexity of a (non necessarily minimal) subshift grows strictly subquadratically, every symmetric and finitely supported probability measure on the topological full group has vanishing asymptotic entropy. In Chapter 3, we exhibit a family of topological full groups of minimal subshifts that contain Grigorchuk groups G_ω as subgroups. This shows that the topological full group of a minimal subshift can have subgroups of intermediate growth, answering a question of Grigorchuk. In Chapter 4 (based on a joint work with K. Juschenko, N. Monod, M. de la Salle), we study various features of extensively amenable group actions, a notion which is a tool to prove amenability of groups. As an application, we prove amenability of groups of interval exchanges whose angular components have rational rank at most 2. We also obtain a "Kesten-like" characterisation of extensive amenability in terms of the inverted orbit and use it give a short, probabilistic proof of the fact that recurrent actions are extensively amenable. Finally we study the Liouville property for groups of interval exchanges, and show that there are groups of interval exchanges that admit no finitely supported measure with trivial boundary. In Chapter 5 (based on a joint work with G. Amir, O. Angel, B. Virág), we establish the Liouville property for all groups acting on rooted trees by bounded automorphisms. This includes in particular groups generated by bounded automata. This strengthens results by various authors about amenability of these groups, some of which are based on proving the Liouville property in some special cases
Pilté, Marion. "Gestion dynamique des ressources de poursuite pour cibles hyper-manoeuvrantes". Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEM068/document.
Texto completoThe new generation of radars is facing increasingly threatening targets. These radars are asked to perform several tasks in parallel, including surveillance and tracking. To this aim, they can be equipped with staring antennas, so they overcome the constraints induced by the rotation of the antenna. The tracking function of the radar has thus to be upgraded to respond to the double issue of tracking highly manoeuvring targets and managing the resources to balance time between tasks. In this context, this thesis investigates new means of tracking highly manoeuvring targets. A new target model based on intrinsic coordinates to perform target tracking is proposed. This new target model is expressed in the frame of the target itself, and uses the Frenet-Serret frame, which is well suited to the description of highly dynamic manoeuvres involving normal accelerations that are much larger than earth gravity. A filtering algorithm using the special intrinsic formulation of the target model is developed. This filtering algorithm is very similar in terms of implementation to an Extended Kalman filter, and was implemented using real data. The comparison with standard target models and filtering algorithms show improvements over simple models and algorithms on a large set of trajectories. A new estimation method, relying on the least squares formulation of the smoothing approach, and taking into account kinematic jumps in the trajectory is also developed. This method also shows improvements over a set of common algorithms based on standard manoeuvre detection. And independently, we investigate the issue of update rate adaptation for radar measurements. A very general update rate adaptation algorithm is derived to optimise the time of revisit of each target, allowing to preserve the radar time budget for other tasks simultaneously performed, such as surveillance
Ferté, Damien. "Dynamique topologique d'une action de groupe sur un espace homogène : exemples d'actions unipotente et diagonale". Rennes 1, 2003. https://tel.archives-ouvertes.fr/tel-00007213.
Texto completoThery, Amélie. "Analyse des interactions dans les groupes :de la détermination des types d'interactions aux liens avec la performance, la satisfaction et le conflit perçu". Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/262099.
Texto completoDoctorat en Sciences économiques et de gestion
info:eu-repo/semantics/nonPublished
Duchene, Maéva. "Le processus de construction identitaire par mimesis du sujet en formation". Aix-Marseille 1, 2010. http://www.theses.fr/2010AIX10066.
Texto completoLécubin, Carole. "Leadership des groupes temporaires en management de projet". Lille 1, 2005. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2005/50374-2005-9.pdf.
Texto completoFallahsohi, Hossein. "Modélisation dynamique des échangeurs diphasiques, appliquée aux groupes frigorifiques contrôlés par une commande avancée". Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00679702.
Texto completoBahlaoui, Moulay Abdellah. "Lagunage à haut rendement expérimental : dynamique de différents groupes bactériens et performances épuratrices sanitaires". Montpellier 2, 1990. http://www.theses.fr/1990MON20289.
Texto completoBroillet, Emmanuel L. "Dynamique des groupes au sein de la communauté indigène du El Salvador, Amérique centrale /". [S.l.] : [s.n.], 2001. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Texto completoBen, Ahmed Ali. "Géométrie et dynamique des structures Hermite-Lorentz". Thesis, Lyon, École normale supérieure, 2013. http://www.theses.fr/2013ENSL0824.
Texto completoIn the vein of Klein's Erlangen program, the research works of E. Cartan, M.Gromov and others, this work straddles between geometry and group actions. The overall theme is to understand the isometry groups of pseudo-Riemannian manifolds. Precisely, following a "vague conjecture" of Gromov, our aim is to classify Pseudo-Riemannian manifolds whose isometry group act’s not properly, i.e that it’s action does not preserve any auxiliary Riemannian metric. Several studies have been made in the case of the Lorentzian metrics (i.e of signature (- + .. +)). However, general pseudo-Riemannian case seems out of reach. The Hermite-Lorentz structures are between the Lorentzian case and the former general pseudo-Riemannian, i.e of signature (- -+ ... +). In addition, it’s defined on complex manifolds, and promises an extra-rigidity. More specifically, a Hermite-Lorentz structure on a complex manifold is a pseudo-Riemannian metric of signature (- -+ ... +), which is Hermitian in the sense that it’s invariant under the almost complex structure. By analogy with the classical Hermitian case, we naturally define a notion of Kähler-Lorentz metric. We cite as example the complex Minkowski space in where, in a sense, we have a one-dimensional complex time (the real point of view, the time is two-dimensional). We cite also the de Sitter and Anti de Sitter complex spaces. They have a constant holomorphic curvature, and generalize in this direction the projective and complex hyperbolic spaces.This thesis focuses on the Hermite-Lorentz homogeneous spaces. In addition with given examples, two other symmetric spaces can naturally play the role of complexification of the de Sitter and anti de Sitter real spaces.The main result of the thesis is a rigidity theorem of these symmetric spaces: any space Hermite-Lorentz isotropy irreducible homogeneous is one of the five previous symmetric spaces. Other results concern the case where we replace the irreducible hypothesis by the fact that the isometry group is semisimple
Daassi, Mohamed. "La conscience collective au sein des équipes virtuelles : déterminants, mesure et nature dynamique". Grenoble 2, 2006. http://www.theses.fr/2006GRE21034.
Texto completoThe aim of this research is focused on describing the construction of a collective awareness environment within virtual teams. We have sought to measure the intensity of collective awareness over time, as well as to determine the set of factors that encourage its emergence. More precisely, our guiding line of inquiry can be stated as follows : in virtual teams, how is collective awareness crated, and how does it evolve over time ? In order to test our theoretical construct, we have adhered to a methodology combining semi-experimental quantitative studies with two qualitative case studies. The quantitative section enabled the quantification of collective awareness levels within virtual teams via the elaboration of a measurement scale. This part equally allowed for testing the dynamic nature of collective awareness levels, as well as the mechanisms leading to its emergence. The qualitative portion seeks to expand our understanding of collective awareness and to deepen the interpretation of the quantitative study’s results. Through these two approaches, we hope to contribute to a better understanding of collective awareness building and dynamics within virtual teams. Collective awareness is a bidimensional construct based on two dual, dynamic processes –activity awareness vs. Social awareness. Finally, our results emphasize the joint effects of trust (cognitive vs. Affective) and group cohesiveness (tasks vs. Social) on collective awareness building
Naccache, Philippe. "La dynamique temporelle des organisations : l'économie des pratiques temporelles". Paris 10, 2007. http://www.theses.fr/2007PA100071.
Texto completoThis research deal with the issue of time in group projects. It uses a qualitative method of enquiry based on three case studies inside French and multinational companies. This research is inspired by the work of the French sociologist, Pierre Bourdieu. More precisely, my work tackles three research questions. The first question tries to capture the individual’s disposition vis-à-vis time which I refer to as “Temporal Habitus”. In doing so, I would like to emphasize that “Temporal Habitus” acts as a causal mechanism which can explain the practice of project members. The second question deal with the coexistence of these different individuals’ time conceptions. This coexistence may generate conflicts between the project’s members especially with regard to both the scope of the project and the meeting of deadlines. In the third question, I show that time may be strategically manipulated by individuals in order to achieve their own goals
Grégori, Nicolas. "Etude clinique d'une situation de conception de produit : vers une pragmatique de la conception". Nancy 2, 1999. http://www.theses.fr/1999NAN21041.
Texto completoGuirardel, Vincent. "Actions de groupes sur des arbres reels, et dynamique dans la frontiere de l'outre-espace". Toulouse 3, 1998. http://www.theses.fr/1998TOU30017.
Texto completoMirabet, Vincent. "Modélisation individu - centrée de la dynamique des groupes d’animaux et applications aux bancs de poissons". Lyon 1, 2007. http://www.theses.fr/2007LYO10093.
Texto completoSome animal groups, like fish schools, may present complex behaviours, without any need for a hierarchical group structure nor any ability of individuals to perceive the behaviour of the whole group. Models, especially individual based models, enable the study of this complexity, by simulating virtual individuals sharing simple local interaction rules. These rules are generally of three types, attraction, alignment and repulsion, operating mainly at long, medium and short distance, respectively. The work presented in this thesis aims first at specifying the conditions under which models can be used to study the tridimensional structure of groups. Programming solutions are given to deal with the limitations concerning the group size that can be simulated. Then, the study focuses on the conditions necessary for a group to optimally benefit from the knowledge of some of its members. For this purpose, a model is used to study the behaviour of a group where a fraction of individuals share a special property of attraction toward the source of a stimulus. Finally, the model is adapted for studying the propagation of waves of agitation observed in some fish schools in the presence of a predator
Guilloux, Antonin. "Equirépartition dans les espaces homogènes". Paris 11, 2007. http://www.theses.fr/2007PA112003.
Texto completoHaïssinsky, Peter. "Dynamique conforme dans les espaces métriques". Habilitation à diriger des recherches, Université de Provence - Aix-Marseille I, 2009. http://tel.archives-ouvertes.fr/tel-00367259.
Texto completoIbarlucía, Tomás. "Méthodes de théorie des modèles pour l'étude de groupes topologiques". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1121.
Texto completoThis thesis gathers different works approaching subjects of topological dynamics by means of logic and descriptive set theory, and conversely. The first part is devoted to the study of Roelcke precompact Polish groups, which are the same as the automorphism groups of N0-categorical structures. They form a rich family of examples of infinite-dimensional topological groups, including several interesting permutation groups, isometry groups and homeomorphism groups of distinguished mathematical objects. Building on previous work of Ben Yaacov and Tsankov, we develop a model-theoretic translation of several dynamical aspects of these groups. Then we use this translation to obtain a precise understanding, in this case, of the dynamical hierarchy studied by Glasner and Megrelishvili. Later, with I. Ben Yaacov and T. Tsankov, we provide a model-theoretic description of the Hilbert-compactification of oligomorphic groups, and we give a characterization of Eberlein oligomorphic groups. We also study automorphism groups of randomized structures, as well the separable models of the theory of beautiful pairs of randomizations. The second part, with J. Melleray, studies full groups of minimal homeomorphisms of the Cantor space and their invariant measures. We show that full groups of minimal homeomorphisms do not admit a Polish group topology, and are moreover non-Borel subsets of the homeomorphism group of the Cantor space. We then study the closures of full groups by means of Fraïssé theory. Finally, we give a characterization of the sets of invariant measures of minimal homeomorphisms of the Cantor space
Krieger, Fabrice. "Sur les invariants topologiques des actions de groupes moyennables discrets". Université Louis Pasteur (Strasbourg) (1971-2008), 2006. https://publication-theses.unistra.fr/public/theses_doctorat/2006/KRIEGER_Fabrice_2006.pdf.
Texto completoMean topological dimension is a topological invariant of actions of amenable groups introduced by M. Gromov in 1999. This invariant is particularly useful in the study of dynamical systems of infinite topological dimension and infinite entropy. In this thesis we are interested in mean topological dimension and topological entropy of actions of discrete amenable groups. We give some general properties of mean topological dimension of closed subshifts over amenable groups where the symbol space is a compact metrizable space. Some results established by E. Lindenstrauss and B. Weiss for actions of the infinite cyclic group are extended to actions of residually finite amenable groups. For example, we give a construction of minimal actions of amenable groups with arbitrary large mean topological dimension. It generalizes the one used by Lindenstrauss and Weiss to give a counterexample to a long-standing embedding problem in topological dynamics. We introduce minimal Toeplitz subshifts for residually finite amenable groups and we prove that their topological entropy can take any non negative value smaller than the entropy of the full shift
Janssen, Danielle. "Analyse dynamique et stochastique de l'intégration fiscale en Europe". Paris 1, 1997. http://www.theses.fr/1997PA010035.
Texto completoThis work develops a dynamic approach of the problem of fiscal integration within the European union. Building on the ambiguous conclusions of the existing literature, the author forges a new approach, focused on dynamic considerations. The author ressorts to instruments derived from the game theory as well as from stochastic financial theory in order to demonstrate the opportunity of a progressive and multi-speed fiscal integration, though irreversible when achieved
Musca, Geneviève. "La dynamique des compétences et des capacités dans l'organisation : le cas d'équipes en charge de projets innovants". Paris 12, 2005. http://www.theses.fr/2005PA123014.
Texto completoThis research focuses on understanding and explaining what are the competencies and capabilities conditions and processes of development in innovating project teams, in a context of uncertainty. This dynamic is viewed as a process of collective sensemaking (Weick, 1979, 1995). This research is exploratory and abductive, with a moderately positivist approach. We accomplished a longitudinal case study of an Internet project with two of its sub-units. Our empirical results suggest that competences dynamic is a variegated process, with great local differences between project teams and phases. From these insights and litterature, we induced propositions linking co-localisation, team heterogeneity, “psychological safety”, hybrid structure, experimentations with a group of two or three, with competencies and capabilities development
Courteix-Kherouf, Sylvie. "Evolutions technico-organisationnelles et activité collective : la cellule dynamique de travail : cas de la maintenance opérationnelle des systèmes du trafic aérien". Toulouse 2, 1995. http://www.theses.fr/1995TOU20044.
Texto completoAugustinova, Maria. "Le potentiel du groupe et sa gestion : quelles implications pour la performance collective et la confiance qu'on lui accorde?" Paris 5, 2004. http://www.theses.fr/2004PA05H042.
Texto completoThis dissertation is focused upon effectiveness of groups when faced with reasoning tasks. The hypothesis explored is that whether it is objective or perceived group effectiveness is contingent upon the collective potential and its management during group work. In line with this idea, the first four studies examined conditions that enhance the quality of information sharing during collective problem solving. In contrast to previous research, our results show that, a)group discussion is not sistematically dominated by information that is widely shared ; b) that the efficiency of group information sharing is namely a function of group members' capacity to perceive the information they hold individually as relevant to share. The latter capacity depends upon both the intrinsic properties of information held (Chap. 1 and 2 exp. 2) and also upon the social context in which the information is processed (Chap. 2 & 3). The aim of the last three studies (Chap. 4) was to examine the roots and limits of the heuristics of heterogeneity i. E. A consensual decision taken by a homogeneous group. The results showed that latter effect is moderated by the information about a group's decisional consistency and about the efficiency of information sharing during a group discussion
Augustini, Muriel. "Dynamique et stratification sociale des groupes domestiques dans deux villages de Basse-Auvergne au XVIIIe siècle". Paris, EHESS, 1992. http://www.theses.fr/1992EHES0312.
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