Colder, harsher parenting attitudes and behaviours negatively impact children's behaviour and development, and have been linked to heightened levels of violence towards children. Parenting interventions can improve outcomes by reducing violent and increasing non-violent parenting behaviours. I investigated how changes associated with a low-cost positive parenting intervention spread through a rural, low-income, South African community. Specifically, I assessed whether exposure to a community-wide social activation process and Parenting for Lifelong Health (PLH) programmes (focused on violence prevention in low-resource settings) significantly predict: (1) improved parenting, and (2) change in the communication networks of female caregivers in the whole community, while controlling for variables such as psychiatric symptoms, parenting stress, and alcohol misuse. Additionally, I investigated whether ties to parenting programme attendees in the communication network predicted improved parenting. Afrikaans-speaking female caregivers (n = 235; mean age 35.92 years), with children aged between 1½ and 18 years old, participated in the intervention; three waves of data were collected (January 2016, June 2017, and February 2019). The social network was measured based on a peer nomination procedure (of study participants whom “you talk to about parenting”). To analyse the role of interpersonal ties as pathways for spreading intervention effects, I make use of Social Network Analysis (SNA), in the form of nominations of people with whom respondents discuss parenting, together with self-report measures of parenting-related outcomes (from caregivers and their children). I then trace the extent to which both the social activation process and the parenting programmes are effective, in part, via their diffusion throughout the community. SNA was used to disentangle whether network changes improved parenting practices (i.e., selection effects) or whether reported improvements in parenting practices improved caregiver information networks (i.e., socialisation effects). Analysis of data from waves 1 and 2 indicated that community-wide improvements in parenting behaviour were evidenced. The significant predictors of improvement were social activation “dose” received, change in network centrality and the influence of indirect exposure to the parenting programmes via attendees. Furthermore, attending at least one session of a parenting programme offered in the intervention significantly predicted change in the caregivers' communication networks, indicating the spread of social influence through their network. The small subset of caregivers (n = 51; 21.7%) attending one or more sessions of a parenting programme evidenced greater activity (i.e., covariate ego effect) and potential influence (i.e., covariate alter effect) within the communication network compared to caregivers who did not attend any programme sessions. This subset of attending caregivers were more likely to reach out to other caregivers to speak about parenting after being exposed to the intervention, and both sought and received social support from other caregivers. Follow-up assessment using a third wave of data showed that while attendees remained socially influential within the caregiver network the overall community improvement was not sustained. These results illustrate the value of social network analysis for ascertaining the pathways through which the intervention achieved its impact and tracking the evolution of social norms within a community. The results indicate an association between spill-over effects from attendees to non-attendees and community-wide changes through targeted interventions.

Made available in DSpace on 2015-05-14T12:36:42Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 2269580 bytes, checksum: 6a6f30367d0a1aa2a50f7c1c09973b1f (MD5) Previous issue date: 2012-08-24 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / In the area of Microelectronics, one of the most difficult it is to find qualified professionals. For the training of these there is a demand for resources - human and material - which most of the time have high cost. Thus, a solution is needed as accessible to institutions and researchers, as adaptable to your needs, providing scalability and dissemination to training, without focusing on quality. From the literature, based and presenting the Ptolemy framework, developed in Java and that allows the simulation of concurrent and heterogeneous systems, and in the Actor Model were directed efforts for the development of a tool for code generation open-source and multiplatform. Thus, the aim of this work is to develop a tool to generate VHDL code based on Ptolemy Actors using the Ptolemy framework. Where, in addition to design and simulate graphically there is a difference in the possibility of modeling at different levels of abstraction and generation of the VHDL code in a hierarchical manner, presenting the process of development of the tool and the results of its use, as well as contributions. / Na área de Microeletrônica uma das maiores dificuldades trata-se de encontrar profissionais capacitados. Para a formação destes há uma demanda por recursos humanos e materiais - que, muitas vezes, tem alto custo. Assim, se faz necessária uma solução tão acessível a instituições e pesquisadores, quanto adaptável às suas necessidades, propiciando escalabilidade e disseminação à formação, sem deixar de focar a qualidade. A partir do levantamento bibliográfico, baseando-se e apresentando o framework Ptolemy, desenvolvido em Java e que possibilita a simulação de sistemas concorrentes e heterogêneos, e no modelo de atores foram direcionados os esforços para o desenvolvimento de uma ferramenta de geração de código open-source e multiplataforma. Sendo assim, o objetivo deste trabalho é o desenvolvimento de uma ferramenta de geração de código VHDL baseada em Atores utilizando o Framework Ptolemy. Onde, além de projetar e simular graficamente há um diferencial na possibilidade de modelagem em níveis diferentes de abstração e geração de código VHDL de forma hierárquica. Apresentado o processo de desenvolvimento da ferramenta e resultados de sua utilização, bem como as contribuições.