This dissertation develops and empirically tests a theory of political participation that posits that the local economic context moderates the effects of individuals’ socioeconomic status by influencing their prospective financial outlooks. These perceptions, in turn, affect individuals’ likelihood of engaging in various political activities. I examine the theory using indicators of economic vitality and status both for the entire population and for racial and ethnic group-specific economic conditions. This two-pronged approach allows me to assess the extent to which group-specific conditions are more salient for minority group members than are more traditional contextual (full population) measures that reflect the economic status of the entire population. Thus, such questions as whether blacks’ financial outlooks are influenced more by the visibility of black-owned businesses or by the total visibility of business activity are addressed. Hypotheses are tested using the 1992 National Election Study, the 1995 Texas Minority Survey, and economic data collected from the U.S. Census Bureau, 1992 Economic Census. Results indicate that the financial perceptions of blacks and Latinos are significantly related to levels of political activity while the financial outlooks of Asians and whites are not significantly related to their political activity.

Because electronic commerce has been flourishing in recent year, the amount and the variety of information on the web have also been rapidly increasing. However, many problems occur as the result of information overload. This thesis is to study the issue of information overload in the field of multimedia that covers not only medium of diffuse knowledge but also entertainment of everyday life. The main goal of this work is to use personalized recommendation technologies to help users select multimedia he is interested in. The thesis investigates two types of personalized recommendation: tag-based recommendation and context-aware recommendation. Regarding the former kind of recommendation, Folksonomy is the popular Web2.0 application that allows users tagging items to indicate the corresponding characteristics. These tags, provided by the users, directly or indirectly reflect his personal interests. Therefore the recommendation performance is enhanced when the tags are used with computational methods. On the other hand, the latter kind focuses on the contents and the relevant situations, because what multimedia is considered suitable for users can be different under different situations. The advantages of the personalized recommendation technology can improve performance of recommendation and take the context into account at the same time. Meanwhile this study also implements a working system for personalized multimedia recommendation.

Context-aware computing aims at making mobile devices sensitive to the social and physical settings in which they are used. A necessary requirement to achieve this goal is to enable those devices to establish a shared understanding of the desired settings. Establishing a shared understanding entails the need to manipulate sensed data in order to capture a real world situation wholly, conceptually, and meaningfully. Quite often, however, the data acquired from sensors can be inexact, incomplete, and/or uncertain. Inexact sensing arises mostly due to the inherent limitation of sensors to capture a real world phenomenon precisely. Incompleteness is caused by the absence of a mechanism to capture certain real-world aspects; and uncertainty stems from the lack of knowledge about the reliability of the sensing sources, such as their sensing range, accuracy, and resolution. The thesis identifies a set of criteria for a context-aware system to capture dynamic real-world situations. On the basis of these criteria, a distributed architecture is designed, implemented and tested. The architecture consists of Primitive Context Servers, which abstract the acquisition of primitive contexts from physical sensors; Aggregators, to minimise error caused by inconsistent sensing, and to gather correlated primitive contexts pertaining to a particular entity or situation; a Knowledge Base and an Empirical Ambient Knowledge Component, to model dynamic properties of entities with facts and beliefs; and a Composer, to reason about dynamic real-world situations on the basis of sensed data. Two additional components, namely, the Event Handler and the Rule Organiser, are responsible for dynamically generating context rules by associating decision events ? signifying a user?s activity ? with the context in which those decision events are produced. Context-rules are essential elements with which the behaviour of mobile devices can be controlled and useful services can be provided. Four estimation and recognition schemes, namely, Fuzzy Logic, Hidden Markov Models, Dempster-Schafer Theory of Evidence, and Bayesian Networks, are investigated, and their suitability for the implementation of the components of the architecture of the thesis is studied. Subsequently, fuzzy sets are chosen to model dynamic properties of entities. Dempster-Schafer?s combination theory is chosen for aggregating primitive contexts; and Bayesian Networks are chosen to reason about a higher-level context, which is an abstraction of a real-world situation. A Bayesian Composer is implemented to demonstrate the capability of the architecture in dealing with uncertainty, in revising the belief of the Empirical Ambient Knowledge Component, in dealing with the dynamics of primitive contexts and in dynamically defining contextual states. The Composer could be able to reason about the whereabouts of a person in the absence of any localisation sensor. Thermal, relative humidity, light intensity properties of a place as well as time information were employed to model and reason about a place. Consequently, depending on the variety and reliability of the sensors employed, the Composer could be able to discriminate between rooms, corridors, a building, or an outdoor place with different degrees of uncertainty. The Context-Aware E-Pad (CAEP) application is designed and implemented to demonstrate how applications can employ a higher-level context without the need to directly deal with its composition, and how a context rule can be generated by associating the activities (decision events) of a mobile user with the context in which the decision events are produced.

Thesis (Ph.D.) - University of Glasgow, 2008. / Ph.D. thesis submitted to the Faculty of Information and Mathematical Sciences, Department of Computing Science, University of Glasgow, 2008. Includes bibliographical references. Print version also available.

Thesis (Ph. D.) -- University of Alberta, 2010. / "A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Doctor of Philosophy, Department of Psychology, University of Alberta." Title from pdf file main screen (viewed on February 12, 2010) Includes bibliographical references.

When performing web searches, users manually open a web browser, direct it to a search engine, input keywords, and finally manually filter and select relevant results. This repetitive task can negatively impact the user's experience, something the automation and personalization of web search can address. This thesis presents PALTask, an Instant Messaging (IM) application that exploits context of both the user and their conversation in order to automate and personalize related web tasks such as web searches relevant to the conversation. PALTask dynamically gathers context and provides feedback from the user and the system at runtime including keywords from the conversation and running them through various search services such as YouTube and Google to retrieve relevant results. This thesis also explores various natural language processing (NLP) tasks such as keyword extraction, sentiment analysis, and stemming. These NLP tasks help in the collection of dynamic context at runtime, identifying personalized context, and analyzing it to improve the user's experience. We also present our keyword ranking algorithm which aims to improve accuracy when retrieving web resources. / Graduate

The amygdala, a small structure located deep bilaterally in the medial temporal lobe, is the key structure for the emotional processing and storage of memories associated with emotional events, especially fear. The structure has also been shown to enable humans and animals to detect and respond to environmental threats. Fear conditioning became the main model to examine the neural substrates of emotional learning in mammals and specifically in rats’. With the fear conditioning method, researchers can tests rats’, responses to aversive stimuli during the delivery of a cue and then measure how the responses change after learning of the association between the stimuli and the cue. After learning of the two stimuli, the delivery of a cue alone will prompt a fear response in the rats. The fear response can also be elicited by placing the rats in the same chamber in which the aversive stimuli has previously been experienced, which depends on both the amygdala and the hippocampus. Where the amygdala stores the memories of stimulus related to fear, the hippocampus seems to hold all the fear memories in relation to contextual information about the stimulus. The aim of this paper will be to make a comprehensive overview of internal neural processes of both the amygdala and hippocampus and the interaction between the two structures during fear conditioning, to see how the structures separately work to overlap emotion and memory processes.

Background:   The importance of creating social and economic value through social entrepreneurship has gained recognition in recent decades. However, the concept has mostly been studied within the Western world, contributing to a skewed perspective of social entrepreneurship, as it also occurs within other contexts. Moreover, the lone actor has been emphasized as the drive for social change. Still, it is argued that it is through several actors within cross sector collaborations that great social impact can be reached.  Purpose of the study: The purpose of this Master Thesis is to explore and broaden the understanding of the phenomenon of social entrepreneurship within a developing country. Moreover, the aim of this Master Thesis is to contribute with insights in how cross sector actors are collaborating in order to enable social entrepreneurship.  Methodological framework: In order to carry out this Master Thesis a qualitative research approach was chosen. A single case study in the western highlands of Guatemala was carried out. The empirical data was gathered through observations and 18 semi structured interviews. Conclusion: The conducted study acknowledges six contexts: the business, the social, the spatial, the formal institutional, informal institutional and the international influence, which are both enabling and constraining social entrepreneurship. Furthermore, the study reveals four factors of how organizations across sectors and nations are collaborating in order to enable social entrepreneurship: forging initial agreement, building leadership, continuous communication and generation and utilization of resources.  The study also reveals the connection of context, cross sector collaboration and social entrepreneurship.

‘Work ability’ is a multidimensional concept with importance for both society and the individual. The overall aim of this thesis was to illuminate work ability from the perspective of individuals (Studies I, III), rehabilitation (Study II) and employers (Study IV). In Study I five focus-group interviews were conducted with a total of 16 former unemployed sickness absentee participants. The interviews focused on their experiences of the environmental impact on return to work. The participants expressed a changed self-image and life rhythm. A need for reorientation and support from professionals was stressed. Experiences of being stuck in a ‘time quarantine’, i.e. a long and destructive wait for support, were also revealed. Study II was a randomised controlled study evaluating the interventional capacity of problem-based method (PBM) groups regarding anxiety, depression and stress and work ability compared to cognitive behavioural therapy (CBT) as a method within the Rehabilitation Guarantee. Effects were measured with psychometric instruments. The participants, 22 in the PBM group and 28 in the CBT group, were persons on sick leave because of common mental disorders. Within-group analysis showed significant lower degree of symptoms regarding anxiety and depression for both interventions. Between-group analysis showed significant lower degree of symptoms for CBT regarding anxiety, depression and stress. Within-group analysis of work ability showed significant improvement in one (out of five) subscales for the PBM group and in four for the CBT group. No significant between-group differences were found regarding work ability. In Study III, 16 participants were interviewed after completed interventions in Study II, eight from each intervention group. The interviews focused on their experiences from the interventions and the impact on their ability to work and perform other everyday activities. The interventions were experienced as having a positive impact on their ability to work and perform other everyday activities in a more sustainable way. Reflecting on behaviour and achieving limiting strategies were perceived as helpful in both interventions, although varying abilities to incorporate strategies were described. The findings support the use of active coping-developing interventions rather than passive treatments. Study IV included interviews with 12 employers and investigated their conceptions of ‘work ability’. In the results three domains were identified: ‘employees’ contributions to work ability’, ‘employers’ contributions to work ability’ and ‘circumstances with limited work ability’. Work ability was regarded as a tool in production and its output, production, was the main issue. The employees’ commitment could bridge other shortcomings. In summary, in the work rehabilitation process, different perspectives on work ability need to be considered in order to improve not only individual performance but also rehabilitation interventions, work-places and everyday circumstances. Clearly pronounced perspectives can contribute to better illustrating the dynamic within the relational and multifaceted concept of ‘work ability’. The ability to work can thus be enhanced through improving individual abilities, discovered through reorientation and created through support and adaptation.

Family violence is a tragedy in any community. The pastoral image of a quiet home in "Mayberry" is shattered by the reality of family violence. The literature reveals that family violence is a social health issue in rural communities, however it does not provide sufficient insight into the influential contextual factors. The goal of this research was to conduct an ethnography into relevant contextual factors in rural family violence to provide researchers with information on which to base decisions, develop effective programs and interventions, and influence policy. The purpose was to better understand this social health issue within the context of a rural community and to identify influential contextual factors useful in developing a praxis theory for addressing health issues in rural communities.Specific aims were: 1) to learn from rural residents how rural context affects family and community health; 2) to deepen understanding of family violence related to rurality; and 3) to propose a theoretical model of family violence for eventual practical use in informing, assessing, and intervening with a community.Methodology: Within a paradigm of social constructivism, interviews and focus groups provided data for this ethnographic study and a scholarly description of family violence in a rural community in southeastern Arizona.Findings: An iterative process of data analysis yielded five organizing themes and an emerging praxis theory. The organizing themes were substance abuse; lack of resources; lack of understanding and awareness of family violence; family and values; and strong sense of community. The emerging theory indicates it is necessary to consider the context, physical environment, and significant relationships of a person when developing and implementing a plan of care to achieve optimal outcomes.Conclusion: A constructionist view that undergirds ethnographic methodology allows for the voice of the community to express the local realities. The juxtaposition of knowledge of nursing and this constructionist view generates meaningful descriptions and understandings of the health problem of family violence. This new knowledge can be used to work with the community to identify intervention strategies. The issues of family violence are inseparably intertwined within a community, so are the solutions.