Made available in DSpace on 2015-04-22T22:16:13Z (GMT). No. of bitstreams: 1 Alcides de Castro Amorim Neto.pdf: 1160215 bytes, checksum: 9d45c01bd11518c19b4c0577a41c7455 (MD5) Previous issue date: 2007-05-26 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / An old problem and of great application in the Applied Mathematics is known as problem of Steiner, with consists of the determination of a point that minimizes certain distances, problem this that was studied by famous mathematical as Fermat and Torricelli. A fundamental result in biochemistry and molecular modelling is the determination of the configurations of minimum energy (MECs) for structures such macromoleculares like proteins and DNA. The Steiner minimal trees (SMT) are seen as a useful algorithm paradigm to model these structures. In this work, we will examine how SMTs and the value of the ratio Steiner (½) compared with the MSTs are correlated with the energies MECs in a way physically significant. We verified that carbon and nitrogen atoms are Steiner points in the proteins minimal Steiner trees. / Um problema antigo e de grande aplicação na Matemática Aplicada é conhecido como problema de Steiner, que consiste na determinação de um ponto que minimize certas distâncias, problema este que foi estudado por outros matemáticos renomados como Fermat e Torricelli. Um dos resultados fundamentais em bioquímica e modelagem molecular é a determinação das Configurações de Energia Mínima (MECs) para estruturas macromoleculares tais como proteínas e DNA. As árvores mínimas de Steiner (SMTs) servem de base para elaboração de algoritmos úteis para modelar estas estruturas. Nesta dissertação, faremos uma revisão bibliográfica sobre o problema de Steiner e verificaremos, através de resultados da literatura, como as SMTs e o valor da razão de Steiner (½) comparado com as árvores geradoras mínimas MSTs estão correlacionadas com as MECs de uma maneira fisicamente significativa. Uma das observações relevantes é que os átomos de carbono e nitrogênio atuam como pontos de Steiner nas árvores mínimas de Steiner das proteínas.

Educators play an essential role within the education system as role models. Many educators, in addition to being affected by learners living with HIV and AIDS, are themselves living with HIV and struggle to cope. SMTs have to play a role in the provision of psychosocial services. The purpose of this study was to explore the types of psychosocial services provided to ELWHIV by their SMTs in order to gain insight and understanding and to make suggestions on how psychosocial services can be improved. A qualitative study was undertaken in 2008. Fifteen interviews were conducted with ELWHIV and members of SMTs at four primary schools in Bela-Bela, Limpopo Province. The findings reveal that SMTs are failing to implement government policies and are not providing adequate support for ELWHIV. None of the participating schools had a functional AIDS policy. Support structures were found to be inadequate and ineffective. Disclosure was identified as one of the major obstacles to the provision of effective services. / Sociology / M.A. (Social Behaviour Studies in HIV/AIDS)

Educators play an essential role within the education system as role models. Many educators, in addition to being affected by learners living with HIV and AIDS, are themselves living with HIV and struggle to cope. SMTs have to play a role in the provision of psychosocial services. The purpose of this study was to explore the types of psychosocial services provided to ELWHIV by their SMTs in order to gain insight and understanding and to make suggestions on how psychosocial services can be improved. A qualitative study was undertaken in 2008. Fifteen interviews were conducted with ELWHIV and members of SMTs at four primary schools in Bela-Bela, Limpopo Province. The findings reveal that SMTs are failing to implement government policies and are not providing adequate support for ELWHIV. None of the participating schools had a functional AIDS policy. Support structures were found to be inadequate and ineffective. Disclosure was identified as one of the major obstacles to the provision of effective services. / Sociology / M.A. (Social Behaviour Studies in HIV/AIDS)

This study aims to determine how School Management Teams (SMTs) are managing the issue of violence in their schools. Specifically, it sought to understand the different management strategies being used and whether SMTs have experienced challenges in implementing these strategies. Methodologically, the study sampled School Management Teams and teachers who are in schools of the Tshwane West Area using a non-probability sampling technique to collect information regarding the issue of violence management in schools using structured interviews. The interviews delved deeply into the psychological effects of violence, its prevention and some legal implications of managing violence in schools. Using thematic analysis, data collected was analysed and interpreted within the theoretical lenses of school violence. The study reached a number of conclusions and made several recommendations. In summary, violence in school requires urgent attention, SMTs and teachers are still struggling to curb an increasing number of sexual assaults and deaths as a result of violent activities in their schools. These challenges are mainly due to the problem of policy on school safety and its implementation within the management structure of schools. / Educational Management and Leadership / Ph. D. (Educational Management)