In the Service Oriented Architecture (SOA) services are computational elements that are published, discovered, consumed and aggregated across platform and organizational borders. The most commonly used technology to achieve SOA are Web Services (WSs). This is due to standardization process (WSDL, SOAP, UDDI standards) and a wide range of available infrastructure and tools. A very interesting aspect of WSs is their composeability. WSs can be easily aggregated into complex workflows, called Composite Web Services (CWSs). These compositions of services enable further reuse and in this way new, even more complex, systems are built.<p>Although there are many languages to specify or implement workflows, in the service-oriented systems BPEL (Business Process Execution Language) is widely accepted. With this language WSs are orchestrated and then executed with specialized engines (like ActiveBPEL). While being very popular, BPEL has certain limitations in monitoring and optimizing executions of CWSs. It is very hard with this language to adapt CWSs to changes in the performance of used WSs, and also to select the optimal way to execute a CWS. <p>To overcome the limitations of BPEL, I present a model-aware approach to execute CWSs. To achieve the model awareness the Coloured Petri Nets (CPN) formalism is considered as the basis of the execution of CWSs. This is different than other works in using formal methods in CWSs, which are restricted to purposes like verification or checking of correctness. Here the formal and unambiguous notation of the CPN is used to model, analyze, execute and monitor CWSs. Furthermore this approach to execute CWSs, which is based on the CPN formalism, is implemented in the model-aware middleware. It is also demonstrated how the middleware improves the performance and reliability of CWSs.

Reducing the complexity in information systems is a main concern on which researchers work. Separation of concerns, also known as the principle of ‘divide and conquer’, has long time been a strategy for dealing with complexity. Two examples of the application of this principle in the area of information system design are the break out the data management into Database Management Systems(DBMSs) and the separation of the business logic from the application logic into Business Process Management Systems (BPMSs). However, separation of cross-cutting concerns from the core-concern of a business process is not yet supported in the Business Process Management (BPM) area. Aspect Oriented principle recommends such a separation. When looking into the business process, several concerns, such as security and privacy, can be identified. Therefore, a formal model that provides a foundation for enabling BPMSs to support separation of concerns in BPM area is needed. This thesis provides a formal model for dealing with separation of concerns in the BPM area. Implementing this model in BPMSs would facilitate the design and implementation of business processes with a lower level of complexity, which in turn would reduce the costs associated with BPM projects. The thesis starts with a literature review on aspect orientation both in programming and in the BPM areas. Based on this study, a list of requirements for an Aspect Oriented Service for BPMSs is compiled. Then a formal model for such a service, fulfilling a set of these requirements, is designed using Coloured Petri Nets and implemented in CPN Tools. The model is evaluated through the execution of a number of scenarios. The solution is also validated through an industrial case study. The results of the case study are presented the direction for future work outlined. The case study demonstrates that separation of concerns through aspect orientation does indeed reduce the complexity of business process models.

<p>The Seventh-day Adventist Church in South Africa was planted towards the end of the 19th century. Within less than forty years after its inception, a separate Coloured department developed. This was not to be the last organizational development impacting upon the Coloured community within the Church. The problem that this study will seek to address is: &ldquo / What factors contributed to the different organizational phases that the predominantly &lsquo / coloured&rsquo / section of the Seventh-day Adventist Church in South Africa underwent between 1887 and 1997?&rdquo / It will examine particularly the role and impact of racism on the various organizational phases.</p>

This project explores the persistence of racial frameworks amongst Coloureds in Wentworth, Durban, using perspectives from discourse analysis as a methodological and theoretical framework. In-depth focus groups and interviews with Wentworth residents were conducted to investigate the continued socio-political relevance of such frameworks in the context of their own identity as 'Coloured', especially where these relate to residual racial hierarchies of the colonial era. Three sample groups were utilised to reflect the community's socio-economic spectrum, which enabled a class-based discussion of the way 'Colouredness' and ideals such as national reconciliation may be reflected by different socio-economic groups. / Thesis (M.Dev.Studies.)-University of KwaZulu-Natal, Durban, 2008.

The Seventh-day Adventist Church in South Africa was planted towards the end of the 19th century. Within less than forty years after its inception, a separate Coloured department developed. This was not to be the last organizational development impacting upon the Coloured community within the Church. The problem that this study will seek to address is: "What factors contributed to the different organizational phases that the predominantly 'coloured' section of the Seventh-day Adventist Church in South Africa underwent between 1887 and 1997?" It will examine particularly the role and impact of racism on the various organizational phases. / Philosophiae Doctor - PhD

Magister Social Work -MSW / Heroin usage is on the increase in the Western Cape province of South Africa owing to globalization and to increased access to the drug in this province. The goal of this study is to explore the experiences of coloured heroin users in the Metro South area of Cape Town, which stretches from Simons Town and Muizenberg to Retreat, Lavender Hill, Grassy Park, Parkwood and Wynberg. These individuals have been found to congregate in the Wynberg CBD. The overarching theoretical framework for the purpose of this research is social constructionism and symbolic interactionism, using a qualitative means of inquiry. Snowball sampling was used to recruit prospective participants and data was collected by means of in-depth interviews, with a semi structures interviewing schedule. The questions informed the subsequent themes and categories that arise from the data collection process. Snowball sampling was employed in this case, a non-probability sample, in which participants were recruited via key informants. The sample distribution included 13 participants, 10 of which were heroin users (5 female, 5 male) and the remaining 3 were key informants which contributed to triangulation of the data.

Magister Artium - MA / We Dare Not Say is an anthology of seven interlinked short stories with the general theme of intergenerational trauma among coloured families in Cape Town. The stories are arranged in a montage of internally, variably and externally focalised narratives that span over a century, from 1900 through to 2015, and are fictionalised accounts of real events, categorising them as biographical fiction. Some of the specific topics covered in the stories include incest, molestation, substance abuse, mental illness and humour as a coping mechanism. The body of work is conceived in the context of the twentieth century trauma narrative, the complexities of which run as undercurrents through most of the important English literary works created in South Africa since the 1800s up until John M. Coetzee, but which has often lacked a female perspective, especially women of colour. The stories in this volume aim to depict a group of people, who, through centuries of oppression in the form of serfdom, servitude and segregation, have developed various coping mechanisms to make sense of their own identity in an absurdly cruel social landscape. The stories focus on the inward turning of violence, substance abuse, silence and humour as survival mechanisms after generations of trauma that have been, in a sense, the hallmarks of coloured South Africa. The stories are told using a split narrative method, showing multiple viewpoints of the same story with perspectives ranging from young to old, crossing the gender divide in both time and space. Ultimately, We Dare Not Say, is a depiction of the complexities of lives lived under oppression, and the triumphs and challenges faced in trying to resolve, live through or deny the effects of such oppression on a group and the individuals that make up that group.

Text in Afrikaans / Organised trade unionism in the South African education sector is a new phenomenon. In this study the emergence and development of Coloured professional teacher associations and teacher trade unions is researched. Although Coloured teacher associations like the Teachers' League were great exponents of professionalism, they nevertheless showed characteristics of modern trade unionism. The development of Coloured professional teacher associations and trade unions is discussed against the background of their quest for teacher unity in South Africa. Since the establishment of the Teachers' League in 1913, the policy of Coloured teacher organizations on teacher unity underwent a remarkable change from mainly ethnic teacher unity (1913-1969) to unity across ethnic divisions (since the late seventies). This policy shift is contextualised in the ever changing political, social and economic milieu in South Africa. Finally recommendations on the professional teacher association enterprise and teacher trade unionism in South Africa is given. / Die georganiseerde vakbondwese in die Suid-Afrikaanse onderwys is 'n nuwe verskynsel. In die studie is die ontstaan en ontwikkeling van die Bruin onderwysverenigingsbedryf en onderwysvakbondwese in Suid­ Afrika nagevors. Alhoewel die vroeere Bruin professionele onderwysverenigings soos die Teachers' League 'n sterk professionle karakter getoon het, het hulle kerumerke van die moderne vakbondwese, veral ten aansien van hul salarisonderhandelinge met onderwysowerhede, geopenbaar wat deurgaans in die verhandeling belig is. Die metabletiese ondersoek na Bruin professionele onderwysverenigings en -vakbonde is onderneem teen die agtergrond van hul etniese en nie-etniese eenheidstrewe in die onderwys. Die eenheidstrewe van Bruin onderwysersverenigings het 'n merkwaardige verruiming sedert die onstaan van die TLSA in 1913 ondergaan - 'n aspek wat in die lig van die deurlopende veranderende sosiale, politieke en ekonomiese klimaat in Suid-Afrika belig is. Ten slotte word aanbevelings ten opsigte van die onderwysverenigingsbedryf en die onderwysvakbondwese in die nuwe Suid-Afrika gemaak. / Educational Studies / M. Ed. (Historiese Opvoedkunde)

Magister Social Work -MSW / Heroin usage is on the increase in the Western Cape province of South Africa owing to globalization and to increased access to the drug in this province. The goal of this study is to explore the experiences of coloured heroin users in the Metro South area of Cape Town, which stretches from Simons Town and Muizenberg to Retreat, Lavender Hill, Grassy Park, Parkwood and Wynberg. These individuals have been found to congregate in the Wynberg CBD. The overarching theoretical framework for the purpose of this research is social constructionism and symbolic interactionism, using a qualitative means of inquiry. Snowball sampling was used to recruit prospective participants and data was collected by means of in-depth interviews, with a semi structures interviewing schedule. The questions informed the subsequent themes and categories that arise from the data collection process.

Made available in DSpace on 2014-06-12T15:52:55Z (GMT). No. of bitstreams: 1 license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2009 / Nos últimos anos, a redução do consumo de energia das aplicações dos sistemas embarcados tem recebido uma grande atenção da comunidade científica, visto que, como o tempo de resposta e o baixo consumo de energia são requisitos conflitantes, esses estudos tornam-se altamente necessários. Nesse contexto, é proposta uma metodologia aplicada nas fases iniciais de projeto para dar suporte às decisões relativas ao consumo de energia e ao desempenho das aplicações desses dispositivos embarcados. Al´em disso, esse trabalho propõe modelos temporizados de eventos discretos que são avaliados através de uma metodologia de simulção estocástica com o objetivo de representar diferentes cenários dos sistemas com facilidade. Dessa forma, para cada cenário ´e preciso decidir o n´umero máximo de simulações e o tamanho de cada rodada da simulação, onde ambos os fatores podem impactar no desempenho para se obter tais estimativas. Essa metodologia considera também, um modelo intermediário que representa a descrição do comportamento do sistema e, é através desse modelo que cenários são analisados. Esse modelo intermediário ´e baseado em redes de Petri coloridas temporizadas que permitem não somente a anáise do software, mas também fornece suporte a um conjunto de métodos bem estabelecidos para verificações de propriedades. É nesse contexto que o software, ALUPAS, responsável por estimar o consumo de energia e o tempo de execução dos sistemas embarcados é apresentado. Por fim, um caso de estudo real, assim como tamb´em, exemplos customizados são apresentados com a finalidade de mostrar a aplicabilidade desse trabalho, onde usuários não especializados não precisam interagir diretamente com o formalismo de redes de Petri.