Although interpersonal violence is the leading cause of nonnatural death among adolescents in South Africa, research is limited. This thesis examined homicides among adolescents (15-19 years) in the city of Johannesburg, South Africa, during the period 2001 to 2009. It aimed to describe the incidence and epidemiology; depict the situational contexts based on victim, offender and event characteristics, and to develop a situational typology of adolescent homicides; and to identify the structural factors associated with neighbourhood levels of adolescent homicide within the city. Four separate studies were conducted using data from the National Injury Mortality Surveillance System (NIMSS), police case records, and Census 2001. The results revealed an average annual homicide rate of 23.4/100 000, with firearm homicides decreasing considerably over the study period, while homicides due to sharp instruments and blunt force increased. The epidemiological results highlighted the vulnerability of male, and black and coloured adolescents. The typological analysis identified three categories of adolescent homicide, namely: 1) male victims killed by strangers during a crime-related event; 2) male victims killed by a friend/acquaintance during an argument; and 3) female victims killed by male offenders, and indicates the need for multiple and focused prevention strategies. Alcohol use was also prevalent, with 39% of the victims tested having positive blood alcohol concentrations (BAC). The characteristics found to be associated with alcohol-related homicides, specifically, male victims killed with sharp instruments in public places, over the weekends and during the evenings, and by a friend/acquaintance draw attention to both the harmful pattern of intoxication-oriented drinking and the risky situational contexts in which adolescents consume alcohol. Finally, the results also showed that the incidence of male and female adolescent homicides was greater in neighbourhoods characterised by poverty and deprivation, while female adolescent homicides were also higher in neighbourhoods marked by high concentrations of households where children were not living with their parents. Overall the results point to the urgent need for a comprehensive prevention strategy that targets adolescents, their families and communities, and also addresses weapon availability, alcohol use, and issues of masculinity and gender to reduce homicides among adolescents. / D. Litt et Phil. (Psychology)

Cette thèse est structurée autour de deux axes d’études : (1) développer des logiques épistémiques formalisant la prise en compte de nouvelles données en présence d'informations incomplètes ou incohérentes ; (2) caractériser les notions de bisimulation sur les modèles de ces nouvelles logiques. Les logiques modales utilisées pour formaliser des raisonnements dans le cadre d’informations incomplètes et incohérentes, telle que la logique modale de contingence, sont généralement plus faibles que les logiques modales standards. Nos travaux se basent sur des méthodes logiques, algébriques et co-algébriques / In this Ph.D. dissertation we investigate reasoning about information change in the presence of incomplete or inconsistent information, and the characterisation of notions of bisimulation on models encoding such reasoning patterns. Modal logics for incomplete and inconsistent information are typically weaker than the standard modal logics, such as the modal logic of contingency. We use logical, algebraic and co-algebraic methods to achieve our aims. The dissertation consists of two main parts. The first part focusses on reasoning about information change, and the second part focusses on expressivity and bisimulation. In the following, we give an overview of the contents of this dissertation

L'investissement et l'innovation jouent un rôle important dans le secteur agricole, permettant aux exploitations de s'adapter aux changements de politiques et aux conditions du marché. Au cours des dernières décennies, les exploitations agricoles de l'Union européenne (UE) ont été confrontées à des changements substantiels à travers la politique agricole commune (PAC). C'est notamment le cas du secteur laitier, qui a vu la fin du régime de quotas laitiers et également vu une volatilité accrue des prix. De tels changements pourraient affecter la productivité et l’efficacité des exploitations agricoles, la compétitivité du secteur laitier et les changements structurels. Comprendre les mécanismes sous-jacents au comportement d’investissement des exploitations pourrait permettre d’identifier les principaux facteurs qui influent sur les tendances observées. Cela pourrait aider à anticiper les futurs changements structurels, prévoir les besoins des exploitations et aider les décideurs publicet les autres acteurs du secteur agricole à adapter leurs politiques. La thèse contribue à cet objectif en analysant pour les exploitations laitières d'une sous-région de Bretagne (Ille-et-Vilaine) en France, (i) l'impact de la suppression du quota laitier sur les décisions d'investissement des agriculteurs et l'hétérogénéité de leurs réactions (ii) le lien entre la performance agricole et les décisions d'investissement des agriculteurs, (iii) le rôle des interactions sociales liées aux effets de voisinage sur la décision d'investissement des agriculteurs. Les résultats montrent que la fin / : Investment and innovation play an important role in the agricultural sector, allowing farms to adapt to policy changes and market condition changes. In the last decades, farms in the European Union (EU) have faced substantial changes in the Common Agricultural Policy (CAP). This is particularly the case of the dairy sector, which has seen the end of milk quota regime and increased price volatility. Such changes could affect farm productivity and efficiency, the dairy sector’s competitiveness and structural change. Understanding the mechanisms underlying farms’ investment behaviour could allow identifying key drivers that influence the observed trends. This could help anticipate future structural changes, predict farms’ needs and help policy makers and other stakeholders in farming to adapt their policy. The thesis contributes to this objective by analysing for dairy farms in a sub-region of Brittany (Ille-et-Vilaine) in France, (i) the impact of the termination of the milk quota onfarmers’ investment decisions and the heterogeneity of farm investment behaviour, (ii) the link between farm performance and farmers’ investment decisions, (iii) the role of social interactions related to neighbourhood effects on farmers' investment decision. Findings show that the termination of the dairy quota policy increased farmers’ incentive to invest, contributing to the trend towards larger, more capital intensive and more specialised dairy farms. In addition, the thesis underlines the need to take into account farmers’ heterogeneity in modelling investment behaviour. Doing so allows

L’objectif de cette thèse est d’étudier l’activation du système affectif médiée par le lexique orthographique au cours de la reconnaissance visuelle des mots. Plus précisément, nous avons étudié l’influence du voisinage orthographique émotionnel négatif et la sensibilité de l’amorçage orthographique à la valence négative de voisins plus fréquents dans une tâche de décision lexicale (TDL) combinée à un paradigme d’amorçage. Le recueil de mesures comportementales et électrophysiologiques (potentiels évoqués) nous a également permis d’évaluer la précocité de l’activation des composantes émotionnelles des voisins. Des mots neutres (e.g., FUSEAU, TOISON) ayant un seul voisin orthographique plus fréquent neutre (e.g., museau) ou négatif (e.g., poison) ont ainsi été présentés dans la TDL. Ils étaient précédés de leur voisin ou d’une amorce contrôle non alphabétique présenté pendant 66 ou 166 ms. Dans un premier temps, l’état émotionnel des participants a été contrôlé (Expériences 1-4). Dans un second temps, il a été manipulé a priori par une induction d’humeur triste (Expériences 5 et 7) ou déterminé a posteriori en considérant le niveau d’épuisement professionnel des participants (Expériences 7-8). Le traitement des mots fréquents neutres ou négatifs a été examiné en complément (Expérience 6). Les résultats montrent un effet inhibiteur du voisinage orthographique émotionnel négatif sur les temps de reconnaissance des mots cibles ainsi qu’un effet inhibiteur d’amorçage orthographique, accru par la durée de présentation des amorces. Trois composantes (P150, N200 et N400) constituent les corrélats électrophysiologiques de l’effet d’amorçage orthographique, sensibles à la valence négative des voisins et à la durée de présentation des amorces. Enfin, l’état émotionnel des individus modifie l’effet d’amorçage orthographique. Les résultats sont interprétés dans un modèle de type Activation Interactive de reconnaissance visuelle des mots adapté aux traitements affectifs. / The aim of this thesis was to study the activation of the affective system mediated by the orthographic lexicon during visual word recognition. More precisely, we have investigated the influence of the negative emotional orthographic neighbourhood and the sensitivity of orthographic priming to the negative valence of higher-frequency neighbours in the lexical decision task (LDT) combined with a priming paradigm. The recording of behavioural and electrophysiological (event-related brain potentials) measures provides also evidences on the early activation of affective components of the neighbours. Neutral words (e.g., FUSEAU [spindle], TOISON [fleece]) with one higher-frequency neighbour, that was either neutral (e.g., museau [muzzle]) or negative (e.g., poison), were presented in the LDT. They were preceded either by their neighbour or by a nonalphabetic control prime, presented 66 or 166 ms. Firstly, the emotional state of participants was controlled (Experiments 1-4). Secondly, it was manipulated a priori by a sad mood induction (Experiments 5 and 7) or determined a posteriori by considering the burnout level of participants (Experiments 7-8). The processing of negative or neutral frequent words have been also examined (Experiment 6). The results showed an inhibitory effect of negative emotional orthographic neighbourhood on target recognition time and an inhibitory effect of orthographic priming, increased by prime duration. Three components (P150, N200, and N400) were the electrophysiological correlates of orthographic priming effect, also depending on the negative valence of higher-frequency neighbours and prime duration. Finally, the emotional state of individuals modified the orthographic priming effect. The results are interpreted in an Interactive Activation model extended to affective processing.

No description available.

Population ageing and the tendency for older adults to have poorer health status than younger adults have raised concerns about potential increases in the number of elderly suffering disease and disability. Significantly, many health problems experienced in later life are associated with the onset of a more sedentary lifestyle. Increasing older adults' participation in leisure time physical activity (henceforth LTPA) offers an opportunity to reduce the prevalence of preventable morbidity in later life and offset a potential burden of ageing on the public health sector. As a forerunner to the development of strategies to increase older adults' LTPA participation, researchers have investigated the intrapersonal, interpersonal and, to a lesser extent, environmental influences on this health behaviour. Recent findings from studies of the adult population have suggested that neighbourhood deprivation, a measure of the socioeconomic conditions of small areas, may significantly influence LTPA participation. Extending previous findings, this research investigated how neighbourhood deprivation influenced older adults' LTPA participation. A total of 63 older adults were recruited from high- and low-deprivation neighbourhoods in Christchurch, New Zealand. Neighbourhoods were selected because of their relative positions on the New Zealand Deprivation Index and were characterised by the researcher as "East-town", a neighbourhood of high deprivation, and "West-town", a neighbourhood of low deprivation. The research incorporated a cross-sectional, comparative and mixed-methods approach. The methods of enquiry employed in this research included a recall survey, Q method, and semi-structured interviewing. Each method addressed a different aspect of the primary research question and provided data that was used in the creation of an integrated model depicting the influence of neighbourhood deprivation on older adults' LTPA participation. The results derived from the three research methods showed that older adults from the low-deprivation neighbourhood of West-town participated in LTPA more frequently than older adults from the high-deprivation neighbourhood of East-town. East-town was identified as having many physical and social environmental constraints to LTPA and comparatively few facilitators. Alternatively, West-town was found to have many physical and social environmental facilitators to LTPA and relatively few constraints. Neighbourhood attributes which appeared to influence older adults' LTPA participation included appropriateness of leisure provision, neighbourhood attractiveness, walkability, traffic, and perceptions of crime and antisocial behaviour. One implication of this research is that environmental interventions should be considered in attempts to engage older adults in LTPA for health purposes, particularly in high-deprivation neighbourhoods.

<p>This study focuses on the changing practices of South African residents’ associations and their relationship with political parties and local government from 1990 to 2006, with the aim to examine how associations in Cape Town respond when they are confronted with a new democratic institutional and political context.</p><p>Two empirical questions guide the analysis: How do residents’ associations perceive that the changing political context has affected them in their attempts to influence agenda-setting and decision-making? And how can we understand the process in which they decide to act, or not act, in response to important changes in their political environment? </p><p>Drawing on social movement theory, most importantly the notions of political opportunity structures and framing processes, an analysis is made of the most significant changes in Cape Town’s post-apartheid institutional and political context. The empirical findings – based on questionnaires, interviews and an in-depth study of the township of Imizamo Yethu in Hout Bay – show that associations in socio-economically distinct areas have different perceptions of their prospects of affecting agenda-setting and decision-making. Because of the close links with political parties, many associations interpret the political and institutional changes as either threats or opportunities depending on which party controls the City Council. In predominantly white affluent areas associations generally seem to underestimate their chances of being influential, whereas those in black poor areas tend to overestimate their ability to influence decision-making when the ANC is in a government position. </p><p>The study contributes to the development of social movement theory by its systematic application of the framework of political opportunity structures in a local urban context outside the US and Western Europe. The pattern suggested by theory, that movements choose their action repertoire according to the rule “as moderate as possible, as radical as necessary”, is largely confirmed by the findings.</p>

This study focuses on the changing practices of South African residents’ associations and their relationship with political parties and local government from 1990 to 2006, with the aim to examine how associations in Cape Town respond when they are confronted with a new democratic institutional and political context. Two empirical questions guide the analysis: How do residents’ associations perceive that the changing political context has affected them in their attempts to influence agenda-setting and decision-making? And how can we understand the process in which they decide to act, or not act, in response to important changes in their political environment? Drawing on social movement theory, most importantly the notions of political opportunity structures and framing processes, an analysis is made of the most significant changes in Cape Town’s post-apartheid institutional and political context. The empirical findings – based on questionnaires, interviews and an in-depth study of the township of Imizamo Yethu in Hout Bay – show that associations in socio-economically distinct areas have different perceptions of their prospects of affecting agenda-setting and decision-making. Because of the close links with political parties, many associations interpret the political and institutional changes as either threats or opportunities depending on which party controls the City Council. In predominantly white affluent areas associations generally seem to underestimate their chances of being influential, whereas those in black poor areas tend to overestimate their ability to influence decision-making when the ANC is in a government position. The study contributes to the development of social movement theory by its systematic application of the framework of political opportunity structures in a local urban context outside the US and Western Europe. The pattern suggested by theory, that movements choose their action repertoire according to the rule “as moderate as possible, as radical as necessary”, is largely confirmed by the findings.

This thesis deals with the synthesis of anisotropic volumetric textures from a single 2D observation. We present variants of non parametric and multi-scale algorithms. Their main specificity lies in the fact that the 3D synthesis process relies on the sampling of a single 2D input sample, ensuring consistency in the different views of the 3D texture. Two types of approaches are investigated, both multi-scale and based on markovian hypothesis. The first category brings together a set of algorithms based on fixed-neighbourhood search, adapted from existing algorithms of texture synthesis from multiple 2D sources. The principle is that, starting from a random initialisation, the 3D texture is modified, voxel by voxel, in a deterministic manner, ensuring that the grey level local configurations on orthogonal slices containing the voxel are similar to configurations of the input image. The second category points out an original probabilistic approach which aims at reproducing in the textured volume the interactions between pixels learned in the input image. The learning is done by non-parametric Parzen windowing. Optimization is handled voxel by voxel by a deterministic ICM type algorithm. Several variants are proposed regarding the strategies used for the simultaneous handling of the orthogonal slices containing the voxel. These synthesis methods are first implemented on a set of structured textures of varied regularity and anisotropy. A comparative study and a sensitivity analysis are carried out, highlighting the strengths and the weaknesses of the different algorithms. Finally, they are applied to the simulation of volumetric textures of carbon composite materials, on nanometric scale snapshots obtained by transmission electron microscopy. The proposed experimental benchmark allows to evaluate quantitatively and objectively the performances of the different methods.

Viduržemio jūros regionas ilgą laiką nebuvo aktualus nei Lietuvai, nei kitoms Vidurio ir Rytų Europos šalims. Globalizacijos akivaizdoje ES plėtojant vis glaudesnius ryšius su tarptautinėmis organizacijomis (JT, NATO, ET, PPO) ir kaimyniniais regionais, strateginio Viduržemio jūros regiono vaidmuo tapo ypač aktualus. Barselonos konferencijoje 1995 m. lapkričio 27–28 d. iškelta ES ir Viduržemio regiono bendradarbiavimo iniciatyva nepasiekė užsibrėžtų tikslų, todėl 2004 m. pradėta Europos kaimynystės politika buvo svarbus žingsnis atvėręs naujo regioninio bendradarbiavimo etapą. Viduržemio jūros regiono šalys nuo pat EKP pradžios intensyviai siekė ir siekia įsitraukti į EKP ir pasinaudoti integracijos pranašumais, ES savo ruožtu regioninio bendradarbiavimo atžvilgiu pradėjo taikyti ne tik tradicines diplomatijos ir prekybos priemonės, bet ir naujas iniciatyvas. Viena jų, nagrinėjama šiame magistro darbe – bendradarbiavimas švietimo ir aukštojo mokslo srityje. Darbo tikslas – atskleisti ES ir Viduržiemio jūros regiono bendradarbiavimą bei išanalizuoti, ES vykdomos politikos įtaką Viduržemio jūros regiono švietimui ir EKP vykdomų į aukštąjį mokslą nukreiptų programų ir projektų efektyvumą. Atliekant šį tyrimą naudojami šaltinių ir literatūros analizės, lyginimo ir pusiau struktūrinio interviu tyrimo metodai. Pirmoje dalyje nagrinėjama ES ir Viduržemio jūros regiono šalių bendradarbiavimo raida, išskiriant ir analizuojant Barselonos konferencijos vaidmenį ir įtaką tarpregioniniam... [toliau žr. visą tekstą] / The Mediterranean region has not been very interesting for a long time not only for Lithuania, but also for others Middle and East Europe countries. In the era of globalization, while EU is constantly building new connections with international organizations (UN, NATO, EC, WTO) and local neighboring regions, the role of strategic Mediterranean has recently became a very important topic. At a conference in Barcelona on November 27 – 28, 1995 a new revival between the Mediterranean and the EU was attempted. However, the desired results were not reached. As a result of this failure in 2004 a new European neighborhood policy was started. This step was very important since it opened a new stage of regional collaborations. All Mediterranean countries have always tried and are still trying to get into EKP and to use integration advantages. At the same time, the EU started to apply not only traditional political diplomacy and international marketing actions, but also began to build new initiatives. One of those new initiatives -- “Collaboration in education and higher education” -- is the subject of the analysis of this masters degree. The main point of this work is to reveal the collaboration between the EU and the Mediterranean region, as well as to analyze the influence of the EU on the Mediterranean region’s education and explore the efficiency of the programs and projects related to higher education. For this research we used literature analysis, halfway structure interviews... [to full text]