L'un des problèmes les plus complexes dans l'analyse des images histologiques est l'évaluation de l¿organisation spatiale des structures histologiques dans le tissu. En fait, les sections histologiques peuvent contenir un très grand nombre de cellules de différents types et irrégulièrement réparties dans le tissu, ce qui rend leur contenu spatial indescriptible d'une manière simple. Les méthodes fondées sur la théorie des graphes ont été largement explorées dans cette direction, car elles sont des outils de représentation efficaces ayant la capacité expressive de décrire les caractéristiques spatiales et les relations de voisinage qui sont interprétées visuellement par le pathologiste. On peut distinguer trois familles principales de méthodes des graphes utilisées à cette fin: analyse de structure syntaxique, analyse de réseau et analyse spectrale. Cependant, un autre ensemble distinctif de méthodes basées sur la morphologie mathématique sur les graphes peut être développé et adapté pour ce problème. L'objectif principal de cette thèse est le développement d'un outil capable de fournir une évaluation quantitative des arrangements spatiaux des structures histologiques en utilisant la morphologie mathématique basée sur les graphes. / One of the most challenging problems in histological image analysis is the evaluation of the spatial organizations of histological structures in the tissue. In fact, histological sections may contain a very large number of cells of different types and irregularly distributed, which makes their spatial content indescribable in a simple manner. Graph-based methods have been widely explored in this direction, as they are effective representation tools having the expressive ability to describe spatial characteristics and neighborhood relationships that are visually interpreted by the pathologist. We can distinguish three main families of graph-based methods used for this purpose: syntactic structure analysis, network analysis and spectral analysis. However, another distinctive set of methods based on mathematical morphology on graphs can be additionally developed for this issue. The main goal of this dissertation is the development of a framework able to provide quantitative evaluation of the spatial arrangements of histological structures using graph-based mathematical morphology.

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In den vergangenen Jahrzehnten hat der Einfluss des Menschen auf Ökosysteme stark zugenommen. Tendenzen der Landnutzungsänderung, darunter die Ausdehnung von Städten und die Intensivierung der Landwirtschaft als Folge des Bevölkerungsanstiegs und damit des Nahrungsmittel- und Energiebedarfs, führen zu Umweltproblemen wie dem Verlust von Lebensraum und biologischer Vielfalt. Die zunehmende Verfügbarkeit von Daten mit feiner räumlicher Auflösung kann die Analyse von Merkmalen und Prozessen in Landschaften mit Hilfe von räumlichen Metriken unterstützen. Das Ziel dieser Arbeit ist es, feinskalige Daten und räumliche Metriken zu integrieren, um Indikatoren zur Messung und Bewertung von Landnutzung, Ökosystemdienstleistungen und deren räumlichen Mustern zu entwickeln und folgende Fragen zu beantworten: Wie können Landnutzungsänderungen und Ökosystemleistungen einer Landschaft beschrieben und analysiert werden? Und, wie kann die Landschaftsperspektive zu unserem Verständnis von Landsystemen beitragen? In zwei verschiedenen Weltregionen werden Landschaften mit Hilfe von Hexagonen als räumliche Einheiten untersucht. Diese dienen zur Analyse von räumlichen Mustern und Beziehungen zwischen verschiedenen Indikatoren (z. B. Ökosystemdienstleistungen) und die Konzeptualisierung von Prozessen auf Landschaftsebene. Obwohl sich einige Phänomene auf feinen räumlichen Skalen manifestieren, ist es für die Operationalisierung und Überwachung dieser Prozesse notwendig, ‚herauszuzoomen‘. Der Landschaftsansatz im Zusammenhang mit Ökosystemleistungen bietet wichtige Perspektiven im Hinblick auf Umweltauswirkungen, die durch Landnutzungsänderungen verursacht werden. Dabei können Indikatoren, die die ökologische, ökonomische und soziale Dimension verknüpfen, dazu beitragen, regionalspezifisches Wissen über Landschaftsdynamiken zu erlangen und dieses Wissen an Entscheidungsträger weiterzugeben, um gezielte Maßnahmen für ein nachhaltiges Landmanagement zu entwickeln. / Over the last decades, anthropogenic pressures on ecosystems have been increasing. Trends of land use change including urban expansion and agricultural intensification driven by population increase, and hence food and energy demand, cause environmental challenges including habitat and biodiversity loss. Analyzing major trends of land use change requires additional metrics to capture local processes on a landscape spatial scale. Increasing fine-scale data availability can support analyses of characteristics and processes of landscapes with the help of spatial metrics, e.g. distance or density measures. The aims of this thesis are to incorporate fine-scale data and spatial metrics to develop indicators to measure and assess land-use, ecosystem services (ESS) and their spatial patterns to answer the following questions: How can land use change and ecosystem services of landscapes be described and analyzed? And how can the landscape perspective contribute to our understanding of land systems? The thesis includes three case studies in two different world regions: 1) characteristics of land use within a peri-urban gradient in Dar es Salaam, Tanzania, 2) characteristics of agricultural landscapes in Brandenburg, Germany, and 3) ecosystem service relationships at different spatial units and scales. In both regions, landscapes are investigated with hexagons as spatial units for the analysis of spatial patterns and relationships among different indicators (i.e., ESS) and conceptualize processes on a landscape level. The landscape approach in context with ecosystem services offers important perspectives regarding environmental impacts caused by land use change. Thereby, metrics integrating the ecological, economic, and social dimensions can support obtaining region-specific knowledge on landscape dynamics and transferring this knowledge to decision-makers to design targeted measures towards sustainable land management.

The island of La Gonave, ~50 km northwest of Port-au-Prince, represents the subsistence Haitian lifestyle. Little is known about human--environment interactions on La Gonave. The first objective of this research was to investigate landscape dynamics through image classification, change detection, and landscape pattern analysis using Landsat 5 (TM) imagery from 1990--2010. Five land cover classes were considered: Agriculture, Forest/Dense Vegetation (DV), Shrub, Barren/Eroded, and Nonforested Wetlands. Overall image classification accuracy was 87%. The area percent change was -39.7, -22.7, 87.4, -7.0, 10.2%, for the respective classes. Landscape pattern analysis illustrated the encroachment of Shrub in core Forest/DV patches and the decline of Agricultural patch integrity. Agricultural abandonment, deforestation, and forest regrowth generated an increasingly fragmented landscape. The second objective of this research was to better understand the survival of the red-tailed hawk (RTH) on La Gonave by exploring the human--RTH relationship. We implemented a survey (n = 121) in 10 rural villages on La Gonave regarding their perceptions and interactions with the RTH during May--June, 2012. During fieldwork we sighted seven RTHs and found one nest. Many respondents noted the aggressive behavior of RTHs during nesting, suggesting reproductive behavior on the island. Our results indicate that RTHs inhabiting this island were not persecuted, despite intense predation of domestic chickens. Aside from predation near homes, villagers do not interact with the hawk as it remains out of sight. The RTH currently has no known predators, but it remains in danger of island extirpation due to ecological degradation. / Master of Science

The problem that was identified is that physical surveillance is not generally used by general detectives in the South African Police Service as a technique during their investigations. According to the researcher’s experience, this can be due to lack of understanding or experience or may stem from ignorance. A lack of training on the use of physical surveillance as a method to obtain information for the investigation process was also identified as a problem. This study therefore investigated the role and use of physical surveillance within the forensic investigation process. The focus of the research was on basic static (stationary), foot and vehicle surveillance as these types of surveillance are usually conducted in conjunction with each other. An empirical research design was used to conduct the research. A qualitative research approach enabled the researcher to obtain first-hand information from interviews with general detectives. Information was also obtained from a thorough literature study and from the researcher’s own experience on the topic. To conduct effective investigation, it is important for investigators to be familiar with the concept of physical surveillance, its elements, its influence and its values. A physical surveillance operation is a forensic tool used to gather evidence, to recover stolen property, and to identify and arrest the perpetrator. The use of physical surveillance during investigations serves the purpose of gathering evidence and information that can be used as intelligence. Successful forensic investigation requires skill and places extraordinary demands on detectives to utilise all available methods and techniques. The recognition of the use of physical surveillance as a method of evidence gathering is of outmost importance. The research has revealed that general detectives do not acknowledge the importance of physical surveillance as a method to obtain information for the investigation process. It is of vital importance that all detectives be properly trained with the necessary knowledge and skills to make use of this valuable investigative tool. / Police Practice / M. Tech. (Forensic Investigation)

The social environment has been recognised as one of the key aspects in determining the quality of life throughout the human lifespan. Human behaviour, thoughts, feelings and attitudes are socially constructed and can only be understood when viewed from the perspective of social interaction. Older individuals, who live in residential facilities experience a diminished quality of life due to factors such as loss of independence, reduced social networks, functional dependence, and contextual changes. Depression, loneliness and social isolation are an integral part of these individuals’ lives. People develop specific styles of relating, also referred to as interpersonal styles. The systems theory is used to explain the circular processes of the interaction between people. In particular the Self-Interactional Group Theory (SIGT) is proposed as theoretical framework to explore the relational qualities of older people in a residential care facility. SIGT views the interaction between people on three levels, namely the intra-personal level, the interpersonal level and the group level, which operate interdependently in the interaction between people. The interpersonal level of analysis consists of the definition of the relationship, relational qualities, motivation to engage with people to address needs and needs satisfaction as well as the circular processes of which the interaction consists of. The interactions between people always take place in an interpersonal context, embedded in broader environments. A qualitative and exploratory research design was selected to explore the relational qualities in interactions between older individuals living in a residential care facility. This study is based on data collected during a primary research study at a residential care facility for older individuals in 2013. The purpose of study was to explore the quality of life of older individuals residing in a residential care facility in Gauteng, South Africa. The data-gathering process in the primary research study involved the Mmogo-Method, a visual projective data-gathering method, the World Café method and person-centred interviews to gain insight into the participants’ life experiences at the residential care facility. For the purpose of this research, only the person-centred interviews were used for the secondary analysis of the data. Twelve purposely-selected individuals (aged 80 to 95; 3 men and 9 women) from the residential care facility participated voluntarily in the person-centered interviews, which were audio recorded. The collected data were transcribed verbatim and subjected to two different methods of analyses. First, data were analysed thematically by adopting an inductive approach. The themes identified in this first phase were next subjected to a deductive content analysis. The themes were categorised according to the relational variables in accordance with the Interactional Pattern Analysis (IPA), thereby contributing to the trustworthiness of the findings. The findings revealed that the interactions between older individuals take place in a broader environment that advocate the active participation of people. Active participation takes place both in and outside the facility and older people reported that this contributed to their quality of life. The relational qualities that could be described as enhancing interpersonal connectivity and satisfying older people’s needs for confirmation were identified as empathy, unconditional acceptance of others, confirmation and interpersonal flexibility. This research, however, highlighted relational qualities that restrained quality of life of older people, namely confusing self-presentation, ineffective expression on needs and withdrawal due to physical immobility. Needs were expressed in a very unspecific, blaming or manipulative manner, and consequently needs were not satisfied, but provoked, instead, feelings of frustration, pain and guilt. This research highlighted the predicament that older people find themselves in. Their decreased physical abilities and limited emotional repertoire to move towards others and the environment also limit their needs satisfaction. The presenting problem of social isolation can be explained by the combination of limited physical mobility and relational qualities that restrain quality of life for older people. This research study thus holds important implications for relationship-focused approaches in residential facilities for older individuals in order to empower and enable them to enhance their quality of life. Specific recommendations include interventions to assist older people to express their needs more effectively and to use opportunities in interaction to confirm them as autonomous functioning older people. / MA (Psychology), North-West University, Potchefstroom Campus, 2014

Ein Vierteljahrhundert nach der Wiedervereinigung Deutschlands gibt es zwischen Ost- und Westdeutschland nach wie vor differierende Anteile von Personen, die eine schulische Hochschulzugangsberechtigung erlangen und diese anschließend durch den Übergang an eine Hochschule einlösen. Mittels eines selbst entwickelten Modells, das sich an die soziologische Wert-Erwartungs-Theorie von Erikson & Jonsson sowie den lebensverlaufstheoretischen Ansatz von Mayer anlehnt, werden verschiedene individuelle und kontextuelle Einflussfaktoren der Studienentscheidung erstmals in einem Kohortenvergleich seit 1990 betrachtet. Neben der Schwelle Hochschulzugang werden zudem erstmals die Bildungsverläufe von zwei Studienberechtigtenkohorten in ihrer Gesamtheit, also unter Berücksichtigung von Fortbildung, Erwerbs- und Familienverläufen über einen Zeitraum von zehneinhalb Jahren vergleichend in den Blick genommen und mittels Sequenzmusteranalysen jeweils typische Verlaufsmuster für ost- und westdeutsche Studienberechtigte ermittelt. Zur Untersuchung der zentralen Forschungsfrage nach Konvergenzen, Divergenzen und dauerhaften Unterschieden in den individuellen und kontextuellen Einflussfaktoren der Studienentscheidung sowie den nachschulischen Bildungsverläufen seit 1990 in Ost- und Westdeutschland werden Daten der DZHW-Studienberechtigtenpanel 1990, 1994, 1999, 2002 und 2006 verwendet. Zusammenfassend werden zahlreiche Konvergenzen und Gemeinsamkeiten identifiziert, insbesondere bei den individuellen Einflussfaktoren für eine Studienentscheidung. Charakteristische Ost-West-Unterschiede zeigen sich u.a. bei der Bedeutung der bisherigen Bildungsbiografie und der antizipierten Studienkosten für die Studienentscheidung sowie der Hochschulentfernung. Die nachschulischen Bildungs- und Lebensverläufe weisen bereits bei der Kohorte 1990 erhebliche Gemeinsamkeiten auf. Bei der Kohorte 1999 haben sich neue Unterschiede bei der Bedeutung von Arbeitslosigkeit und Familientätigkeit herausgebildet. / A quarter of a century has passed since the reunification of Germany. The proportion of young people who acquire a university entrance qualification and those who attend university subsequently differ in part considerably between East and West Germany. This survey examines different individual and contextual factors, which influence the decision to attend university, for the first time by contrasting cohorts since 1990, using a specifically developed model, which closely follows the rational choice model by Erikson & Jonsson and the life-course theory approach by Mayer. The transition to a university is one threshold in the complete educational after-school career. Therefore, the educational careers of two cohorts entitled to study are for the first time examined as a whole, regarding further training, as well as occupational trajectories and family development over a period of ten and a half years after schooldays; by means of sequence pattern analyses, typical sequential patterns of school leavers from East and respectively West Germany are identified. For the examination of the central research question concerning convergences, divergences and permanent differences with regard to the individual and contextual factors, which have influenced study decisions and after-school educational careers since 1990 in East and West Germany, this investigation uses data from the DZHW panels about persons entitled to study from 1990, 1994, 1999, 2002, and 2006. To sum up, numerous convergences and commonalities can be identified, especially regarding the individual factors, which influence the decision to attend university. But typical East-West differences appear with regard to the importance of the previous educational career and the anticipated costs to study, but also the distance of university. The after-school educational and life courses have already many common features in the cohort from 1990. New differences have developed in the cohort from 1999.

Topographic depressions are naturally occurring low land areas surrounded by areas of high elevations, also known as “pits” or “sinks”, on terrain surfaces. Traditional watershed modeling often neglects the potential effects of depressions by implementing removal (mostly filling) procedures on the digital elevation model (DEM) prior to the simulation of physical processes. The assumption is that all the depressions are either spurious in the DEM or of negligible importance for modeling results. However, studies suggested that naturally occurring depressions can change runoff response and connectivity in a watershed based on storage conditions and their spatial arrangement, e.g., shift active contributing areas and soil moisture distributions, and timing and magnitude of flow discharge at the watershed outlet. In addition, recent advances in remote sensing techniques, such as LiDAR, allow us to examine this modeling assumption because naturally occurring depressions can be represented using high-resolution DEM. This dissertation provides insights on the effects of depressions on overland flow processes at multiple spatial scales, from internal depression areas to the watershed scale, based on hydrologic connectivity metrics. Connectivity describes flow pathway connectedness and is assessed using geostatistical measures of heterogeneity in overland flow patterns, i.e., connectivity function and integral connectivity scale lengths. A new algorithm is introduced here to upscale connectivity metrics to large gridded patterns (i.e., with > 1,000,000 cells) using GPU-accelerated computing. This new algorithm is sensitive to changes of connectivity directions and magnitudes in spatial patterns and is robust for large DEM grids with depressions. Implementation of the connectivity metrics to overland flow patterns generated from original and depression filled DEMs for a study watershed indicates that depressions typically decrease overland flow connectivity. A series of macro connectivity stages based on spatial distances are identified, which represent changes in the interaction mechanisms between overland flow and depressions, i.e., the relative dominance of fill and spill, and the relative speed of fill and formation of connected pathways. In addition, to study the role of spatial resolutions on such interaction mechanisms at watershed scale, two revised functional connectivity metrics are also introduced, based on depressions that are hydraulically connected to the watershed outlet and runoff response to rainfall. These two functional connectivity metrics are sensitive to connectivity changes in overland flow patterns because of depression removal (filling) for DEMs at different grid resolutions. Results show that these two metrics indicate the spatial and statistical characteristics of depressions and their implications on overland flow connectivity, and may also relate to storage and infiltration conditions. In addition, grid resolutions have a more significant impact on overland flow connectivity than depression removal (filling).

This study explores incidents in a spatial and temporal context to achieve suitable strategies for urban planning and policing in crime prevention/reduction. For this purpose, space and time related incidents are analyzed through new crime ecology theories within the designed loose-coupled GIS-based system at mezo-micro ecological levels in a case area within Ankara Metropolis, in 2000. Its main argument is that incidents display differences in the spatial and/or temporal distribution among planned, squatter, and in-transition settlements. In exploring distribution of incidents at global and local scales, it also searches the validity and critical adaptability of the new theories developed/practiced in North American and European countries. In line with new theories, incidents at global scale displayed clustering in space and time. Generally, incidents in aggregate, concentrated mostly in planned / less in in-transition / least in squatter areas / and particularly during spring-summer months. However, incidents against people and against property predominated respectively in squatter and planned areas, and between 18:00-00:00, and 00:00-08:00. As for local scale, incidents in aggregate, displayed spatial interaction (clustering), but no space-time interaction. Spatial distribution in time suggested that incidents persistently occur mainly in planned areas. v Incidents against property displayed highest level of spatial, and also temporal clustering at global scale / and particularly spatial clustering (particularly for commercial burglaries/thefts) and space-time clustering (for residential burglaries) at local scale. Complementarily, relatively homogenous global scale spatial distribution of incidents against people is accompanied by their non local scale spatial clustering or space-time clustering, whereby space-time dispersion was observed for simple batteries.

The social environment has been recognised as one of the key aspects in determining the quality of life throughout the human lifespan. Human behaviour, thoughts, feelings and attitudes are socially constructed and can only be understood when viewed from the perspective of social interaction. Older individuals, who live in residential facilities experience a diminished quality of life due to factors such as loss of independence, reduced social networks, functional dependence, and contextual changes. Depression, loneliness and social isolation are an integral part of these individuals’ lives. People develop specific styles of relating, also referred to as interpersonal styles. The systems theory is used to explain the circular processes of the interaction between people. In particular the Self-Interactional Group Theory (SIGT) is proposed as theoretical framework to explore the relational qualities of older people in a residential care facility. SIGT views the interaction between people on three levels, namely the intra-personal level, the interpersonal level and the group level, which operate interdependently in the interaction between people. The interpersonal level of analysis consists of the definition of the relationship, relational qualities, motivation to engage with people to address needs and needs satisfaction as well as the circular processes of which the interaction consists of. The interactions between people always take place in an interpersonal context, embedded in broader environments. A qualitative and exploratory research design was selected to explore the relational qualities in interactions between older individuals living in a residential care facility. This study is based on data collected during a primary research study at a residential care facility for older individuals in 2013. The purpose of study was to explore the quality of life of older individuals residing in a residential care facility in Gauteng, South Africa. The data-gathering process in the primary research study involved the Mmogo-Method, a visual projective data-gathering method, the World Café method and person-centred interviews to gain insight into the participants’ life experiences at the residential care facility. For the purpose of this research, only the person-centred interviews were used for the secondary analysis of the data. Twelve purposely-selected individuals (aged 80 to 95; 3 men and 9 women) from the residential care facility participated voluntarily in the person-centered interviews, which were audio recorded. The collected data were transcribed verbatim and subjected to two different methods of analyses. First, data were analysed thematically by adopting an inductive approach. The themes identified in this first phase were next subjected to a deductive content analysis. The themes were categorised according to the relational variables in accordance with the Interactional Pattern Analysis (IPA), thereby contributing to the trustworthiness of the findings. The findings revealed that the interactions between older individuals take place in a broader environment that advocate the active participation of people. Active participation takes place both in and outside the facility and older people reported that this contributed to their quality of life. The relational qualities that could be described as enhancing interpersonal connectivity and satisfying older people’s needs for confirmation were identified as empathy, unconditional acceptance of others, confirmation and interpersonal flexibility. This research, however, highlighted relational qualities that restrained quality of life of older people, namely confusing self-presentation, ineffective expression on needs and withdrawal due to physical immobility. Needs were expressed in a very unspecific, blaming or manipulative manner, and consequently needs were not satisfied, but provoked, instead, feelings of frustration, pain and guilt. This research highlighted the predicament that older people find themselves in. Their decreased physical abilities and limited emotional repertoire to move towards others and the environment also limit their needs satisfaction. The presenting problem of social isolation can be explained by the combination of limited physical mobility and relational qualities that restrain quality of life for older people. This research study thus holds important implications for relationship-focused approaches in residential facilities for older individuals in order to empower and enable them to enhance their quality of life. Specific recommendations include interventions to assist older people to express their needs more effectively and to use opportunities in interaction to confirm them as autonomous functioning older people. / MA (Psychology), North-West University, Potchefstroom Campus, 2014