Recently there has been considerable interest in Cornish ethnicity reflected both by a rise in the numbers in Cornwall who identify as Cornish and by academic research. Cornish studies have constructed a regional narrative embracing Celticity and an economy based on primary industries, particularly mining, from which has evolved a distinctive culture. This study adopting an ethnographic approach, extends Cornish studies by considering a number of elements which have not previously been addressed. These include investigating how identity may be played out in a particular place to see whether there may be differences in how ethnicity is performed within Cornwall, looking at how it may be practiced collectively in the context of civil society and examining the relationship between ethnicity and place identity. Three settings within Penzance have been selected to represent some of the issues prevalent in twenty first century Cornwall. They include a study of festivals celebrating ethnicity and place identity, an investigation of how kinship and ethnicity are the basis for social cohesion on a social housing estate and an analysis of a dispute over harbour re-development reflecting tensions between regeneration and conservation. Investigating the civil society associated with each of these settings has identified a number of discourses which influence place images, are the focus for debate and reflect different ways in which ethnicity is articulated and performed. Influences on Cornish identity have been exposed which have not been previously explored by Cornish Studies including the relationship between civil society and the state, the importance of place mythology and the impact of inward migration. The study concludes that collective identities, ethnicity and place images are constantly in flux driven by discourses debated within the micro-politics of civil society and that the overarching narratives of Cornishness contain tensions and cleavages which help explain the fractured nature of much of public life in Cornwall.

Cette thèse porte sur deux types de problèmes de mécanique statistique : il y est question de percolation sur les groupes et de modèles dirigés. Dans le premier cas,il s’agit de réaliser un groupe comme objet géométrique (via la notion de graphe de Cayley), puis de morceler ce dernier aléatoirement. L’étude de ce processus révèle des liens étroits entre les propriétés géométriques d’un groupe et le comportement de la percolation de Bernoulli sur celui-Ci. Dans le second cas, on s’intéresse à des modèles où haut et bas jouent des rôles différents, ce qui permet de rendre un certain nombre de questions accessibles à l’étude rigoureuse.Le chapitre 1 renforce le théorème d’indistinguabilité de Lyons et Schramm en percolation, lequel stipule que les composantes connexes infinies fournies par la percolation de Bernoulli sur un graphe de Cayley ont presque sûrement toutes la même allure. La non-Trivialité de ce renforcement est illustrée par un modèle dirigé qui vérifie la propriété d’indistinguabilité mais pas la propriété renforcée.Le chapitre 2 est le fruit d’un travail réalisé en collaboration avec Vincent Tassion.On y démontre que la valeur du paramètre critique pour la percolation de Bernoulli ne dépend essentiellement que de la structure locale du graphe de Cayley abélien considéré.Dans le chapitre 3, on introduit une version dirigée du modèle DLA, pour laquelle on établit l’existence d’une dynamique en volume infini, un contrôle sur la propagation d’information et des inégalités asymptotiques sur la largeur et la hauteur de l’agrégat. / This thesis deals with two kinds of statistical mechanics problems: percolation ongroups and directed models. In the first case, we realise the group under considerationas a geometric object (via the notion of Cayley graph) before breaking it apartrandomly. The study of this process reveals deep connections between the geometricproperties of a group and the behaviour of Bernoulli percolation on it. In the secondcase, we focus on models where up and down play different roles, which makes severalquestions less hard to tackle.Chapter 1 strengthens the Indistinguishability Theorem of Lyons-Schramm, whichstates that the infinite clusters yielded by a Bernoulli percolation on a Cayley graphalmost surely all look alike. The non-Triviality of this strengthening is illustrated bya directed model that satisfies the Indistinguishability Property but not the StrongIndistinguishability Property.Chapter 2 has been obtained in collaboration with Vincent Tassion. We show thatthe value of the critical parameter for Bernoulli percolation essentially only dependson the local structure of the considered abelian Cayley graph.In Chapter 3, we introduce a directed version of the DLA model, for which weestablish the existence of an infinite volume dynamics, control the propagation ofinformation and prove asymptotic inequalities on the width and height of the cluster.

A ancestralidade do edifício sinagogal atribuiu a este um papel central na formação da arquitetura religiosa ocidental. Entretanto sua adaptação à localidade, no decorrer dos séculos, concedeu-lhe os mais variados repertórios. Aspectos ligados ao uso, porém, demandaram soluções espaciais para problemáticas que permaneceram ao longo do tempo. Essas soluções que envolvem o programa de necessidades dos edifícios, sua dimensão e capacidade de uso, suas relações com a arquitetura das diferentes localidades e as consequentes ações de preservação da identidade e a organização dos elementos da liturgia, dentro do espaço interno do edifício, geraram as transformações que, reunidas, constituem uma radiografia da arquitetura da sinagoga no tempo. / The ancestry of the synagogue building attributed to this a central paper in the formation of the religious architecture occidental person. However, its adaptation to the locality in elapsing of the centuries granted to it the most varied repertoires. On aspects to the use, however, had demanded space solutions for problematic that they had remained throughout the time. These solutions that involve the program of necessities of the buildings, its dimension and capacity of use, its relations with the architecture of the different localities and the subsequent actions of preservation of the identity and the organization of the elements of the liturgy inside of the internal space of the building, had generated the transformations that, congregated, constitute a picture of the architecture of the synagogue in the time.

Esta pesquisa é o resultado das observações de caráter etnográfico sobre um recorte proposto para um quadro específico de circulação migratória transnacional. A partir da abordagem de um caso específico, a emigração é tomada de diversas escalas de análise, mas com ênfase sobre os modos pelos quais ela é produzida e significada na esfera lo-cal. O quadro enfocado remete aos movimentos sazonais de afastamento e retorno dos emigrantes da aldeia de Vilas Boas, no interior nordeste de Portugal. Procurei seguir os agentes pelos seus deslocamentos entre o contexto de partida e os contextos de destino para os quais rumaram, sem por isso perder de vista a aldeia como foco de seu interesse e da participação social. A maior parte do trabalho de campo, no entanto, se deu no con-texto de retorno massivo dos emigrantes para a aldeia para a ocasião de celebração da festa religiosa local. Nesse contexto são observadas as diferentes maneiras pelas quais as o contingente emigrante se relaciona com o grupo que reside na aldeia, bem como os modos pelos quais constroem sua participação na festa e na vida social local. Trata-se, portanto, de uma reflexão sobre práticas que sustentam transnacionalmente relações sociais e as atualizam no reencontro ocasionado pelo retorno. / This research is the result of ethnographic observations about a proposed cut to a partic-ular frame of transnational migratory movement. From the approach of a specific case, emigration is taken from different scales of analysis, but with emphasis on the ways in which it is produced and meant at the local level. The frame refers to the seasonal movements focused on departure and return of emigrants from the village of Vilas Bo-as, northeast of Portugal. I seek to follow the agents for their displacements between the context of departure and destination contexts for which they headed, without losing the perspective of the village as the focus of interest in social participation of agents. Most of the field work, however, occurred in the context of massive return of migrants to the village for the celebration of a religious festival site. In this context are observed the different ways in which the emigrant group relates to the people residing in the village as well as the ways in which their participation in making the party and the local social life. It is, therefore, a reflection on practices that sustain social relations transnationally and update the reunion caused by return.

Les courbes remplissant l'espace sont connues pour la capacité d'ordonner les points multidimensionnels sur une ligne en tout conservant la localité, i.e. les points proches sont toujours proches sur la ligne. La conservation de la localité est beaucoup recherchée dans plusieurs applications. La courbe de Hilbert est la courbe remplissant l'espace qui conserve le mieux la localité. Cette courbe est originalement proposée en 2D, i.e. n'est qu'applicable aux points dans un espace 2D. Pour une perspective d'application dans le cas multidimensionnel, nous proposons dans cette thèse une généralisation de la courbe de Hilbert. La courbe généralisée est définie en s'appuyant sur la propriété essentielle de la courbe de Hilbert qui crée son niveau de conservation de la localité : l'adjacence. Ainsi, elle évite la dépendance du motif primitif RBG qui est le seul motif primitif de la courbe étendu par les recherches précédentes. Le résultat est donc une famille de courbe conservant bien la localité. L'optimisation de la conservation de la localité est aussi abordée pour permettre de retrouver la courbe qui conserve le mieux la localité. Pour cet objectif, nous proposons une mesure de la conservation de la localité. En s'appuyant sur les paramètres, cette mesure peut adapter aux différentes situations applicatives comme le changement de métrique ou de taille de localité. La construction est une partie importante de la thèse, elle est la base du calcul de l'index utilisé dans l'application. Pour un calcul de l'index rapide, la courbe de Hilbert autosimilaire est utilisée. La courbe de Hilbert satisfaisant les conditions de la courbe fait l'objet du chapitre 4. La courbe généralisée est enfin appliquée dans la recherche d'image. Il s'agit d'une recherche par le contenu où chaque image est caractérisée par un vecteur multidimensionnel. Les images sont ordonnées par la courbe sur une ligne ; ainsi, la recherche est simplifiée en une recherche sur une liste ordonnée. En donnant une image d'entrée, les images similaires sont celles correspondantes aux index voisins de l'index de l'image d'entrée. La conservation de la localité garantit que ces index correspondent aux images similaires. / The space-filling curves are known for the ability to order the multidimensional points on a line while preserving the locality, i.e. the close points are closely ordered on the line. The locality preserving is wished in many applications. Hilbert curve is the best locality preserving space-filling curve. This curve is originally proposed in 2D, i.e. it is only applied to points in a 2D space. For application in the multidimensional case, we propose in this thesis a generalization of Hilbert curve. Generalized curve is based on the essential property of Hilbert curve that creates its level of locality preserving: the adjacency. Thus, it avoids the dependence on the pattern RBG, which is the only pattern of the curve extended by previous researches. The result is a family of curves preserving well the locality. The optimization of the locality preserving is also addressed to find out the best locality preserving curve. For this purpose, we propose a measure of the locality preserving. Based on the parameters, this measure can adapt to different application situations such as the change of metric or locality size. The curve construction is an important part of the thesis. It is the basis of the index calculation used in application. For a rapid index calculation, the self-similar Hilbert curves is used. They are Hilbert curves satisfying the self-similar conditions specified in chapitre 4. The generalized curve is finally applied in image search. It is the question of the content-based image search (CBIR) where each image is characterized by a multidimensionalvector. Images are ordered by the curve of a line, and the search is simplified to the search on an ordered list. By giving an input image, similar images are those corresponding to neighbors of the index of the input. The locality preserving ensures that these indexes correspond to similar images.

Les problématiques de consommation dans la hiérarchie mémoire sont très présentes dans les architectures actuelles que ce soit pour les systèmes embarqués limités par leurs batteries ou pour les supercalculateurs limités par leurs enveloppes thermiques. Introduire une information de classification dans le système mémoire permet une gestion hétérogène, adaptée à chaque type particulier de données. Nous nous sommes intéressé dans cette thèse plus précisément aux données en lecture seule et étudions les possibilités d’une gestion spécifique dans la hiérarchie mémoire à travers un codesign compilation/architecture. Cela permet d’ouvrir de nouveaux potentiels en terme de localité des données, passage à l’échelle des architectures ou design des mémoires. Evaluée par simulation sur une architecture multi-coeurs, la solution mise en oeuvre permet des gains significatifs en terme de réduction de la consommation d’énergie à performance constante. / The energy consumption of the memory system in modern architectures is a major issue for embedded system limited by their battery or supercalculators limited by their Thermal Design Power. Using a classification information in the memory system allows a heterogeneous management of data, more specific to each kind of data. During this thesis, we focused on the specific management of read-only data into the memory system through a compilation/architecture codesign. It allows to explore new potentials in terms of data locality, scalability of the system or cache designs. Evaluated by simulation with multi-core architecture, the proposed solution others significant energy consumption reduction while keeping the performance stable.

Many-core architectures provide an efficient way of harnessing the growing numbers of transistors available in modern fabrication processes; however, the parallel programs run on these platforms are increasingly limited by the energy and latency costs of communication. Existing designs provide a functional communication layer but do not necessarily implement the most efficient solution for chip-multiprocessors, placing limits on the performance of these complex systems. In an era of increasingly power limited silicon design, efficiency is now a primary concern that motivates designers to look again at the challenge of cache coherence. The first step in the design process is to analyse the communication behaviour of parallel benchmark suites such as Parsec and SPLASH-2. This thesis presents work detailing the sharing patterns observed when running the full benchmarks on a simulated 32-core x86 machine. The results reveal considerable locality of shared data accesses between threads with consecutive operating system assigned thread IDs. This pattern, although of little consequence in a multi-node system, corresponds to strong physical locality of shared data between adjacent cores on a chip-multiprocessor platform. Traditional cache coherence protocols, although often used in chip-multiprocessor designs, have been developed in the context of older multi-node systems. By redesign- ing coherence protocols to exploit new patterns such as the physical locality of shared data, improving the efficiency of communication, specifically in chip-multiprocessors, is possible. This thesis explores such a design - Proximity Coherence - a novel scheme in which L1 load misses are optimistically forwarded to nearby caches via new dedicated links rather than always being indirected via a directory structure.

The main goal of this diploma thesis is based on conceptual analysis and empirical research to assess the suitability of the concept of poverty culture (Oscar Lewis) for analyzing the situation of socially excluded people - specifically Roma - in the Czech Republic with emphasis on education. In the first part of the work I will focus on the analysis of key terms and concepts related to racism, ethnicity and especially the culture of poverty. The second part is devoted to the issue of Roma education in the Czech Republic. I will use the knowledge from these parts as a basis for the operationalization of the given conceptual field into a form usable for empirical research. The last part introduces the implementation of a qualitative research probe between teachers and teaching assistants in a selected socially excluded locality, which focuses mainly on their work motivation and approach to socially excluded localities, etc. My research shows that the concept of Oscar Lewis can be applied in a school environment.

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This thesis deals with the influence of changes in the surrounding of development project area on its return. This is done in the form of defining the main areas of environmental change. These are based on exploration of the possibilities of urban development, the development process and the methods of its evaluation. From them, possible scenarios are put together, determined their predictability, identified aspects that can affect them and the stages of the process when they can occur. These scenarios are eventually verified on specific projects.