Orientador: Maria Beatriz Felgar de Toledo / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Computação / Made available in DSpace on 2018-08-16T08:41:15Z (GMT). No. of bitstreams: 1 Pierre_AllynGreydeAlmeidaLima_M.pdf: 1760009 bytes, checksum: 4af51767131cfa3c30ee8f7ea8830949 (MD5) Previous issue date: 2009 / Resumo: Dentre as tecnologias emergentes, a computação móvel tem a sua posição de destaque. Os dispositivos móveis estão mais presentes na vida das pessoas e contendo aplicações mais sofisticadas e semelhantes às executadas em computadores pessoais. Num mundo globalizado, onde o tempo é escasso e valioso, os dispositivos móveis mantêm as pessoas em contato com informações e atividades que elas desejam enquanto elas estão em movimento. Um exemplo recente é aumento do uso da internet em celulares, permitindo que os usuários acessem diversos tipos de aplicações, tendo grande parte delas interação com bancos de dados. Apesar de atrativa, a computação móvel traz desafios ao desenvolvedor, pois ele deve considerar os recursos limitados tais como largura de banda, conectividade e o alto custo da obtenção de dados. Nesse contexto, as transações representam um importante papel de garantir que o dinamismo do ambiente da computação móvel não comprometa a confiabilidade das aplicações. Porém, algumas aplicações não podem ser implementadas considerando o modelo de transações tradicional, pois elas têm um tempo mais longo de duração do que aquelas convencionalmente modeladas. Sendo assim, as configurações de uma transação realizadas no início de sua execução podem deixar de ser adequadas no decorrer da sua execução, devido às mudanças no ambiente. Diversos modelos de transações têm sido apresentados na literatura para atender a esse ambiente. Apesar de muitas idéias interessantes e relevantes, alguns modelos não permitem que a adaptação diante da variação dos recursos seja realizada durante a execução de uma transação e quando permitem, eles realizam grandes reconfigurações arquiteturais. Motivada por essas questões, essa dissertação propõe transações reconfiguráveis, isto é, a configuração dinâmica de mecanismos transacionais antes do início da transação e a reconfiguração de propriedades transacionais durante sua execução. Para que a reconfiguração dinâmica fosse realizada, um modelo de componentes chamado OpenCOM foi utilizado na arquitetura proposta, por este ser reflexivo, leve e independente de plataforma. O nível de isolamento é a propriedade transacional que poderá ser reconfigurada durante a transação e o controle de concorrência é o mecanismo que garantirá o isolamento entre as transações e poderá ser configurado antes do início da transação. A configuração do controle de concorrência é uma contribuição inovadora dessa dissertação, pois em muitos trabalhos existentes não é possível a configuração desse mecanismo transacional. A fim de validar a arquitetura proposta, um protótipo de um sistema de vendas foi desenvolvido. Através dessa implementação foi possível analisar os impactos da reconfiguração durante uma transação / Abstract: Among the emerging technologies, mobile computing has its position of prominence. Mobile devices are more present in people's lives and with more sophisticated applications similar to those implemented in personal computers. In a globalized world where time is scarce and of great importance, mobile devices keep people in touch with information and activities they want while they are moving. A recent example is the increasing use of the Internet on mobile phones allowing users to access various types of applications and much of them interacting with databases. Although attractive, the mobile computing brings challenges to the developer because he must consider the limited resources such as bandwidth, connectivity and the high cost of obtaining data. In this context, the transactions represent an important role to ensure that the dynamic environment of mobile computing does not compromise the reliability of applications. However some applications cannot be implemented given the traditional transactions models because they have a longer duration than those conventionally shaped. Therefore the settings of a transaction carried out before its execution may not be appropriate during the execution due to changes in the environment. Various transactions models have been reported in the literature to serve this environment. Although having many interesting and relevant ideas, some models do not allow the adaptation in the face of change of resources during the execution of a transaction and when this is allowed, they require many transactional reconfigurations. Motivated by these issues, this dissertation proposes reconfigurable transactions that are the dynamic configuration of transactional mechanisms before the beginning of the transaction and the reconfiguration of transactional properties during its execution. For dynamic reconfiguration, a component model called OpenCOM has been used in the proposed architecture because it is reflective, lightweight and platform-independent. The isolation level is the property that may be reconfigured during the transaction and the concurrency control is the mechanism that ensures the isolation between the transactions and it can be configured before the beginning of transaction. The configuration of concurrency control is an original contribution of this dissertation because many works do not allow the configuration of this transactional mechanism. In order to validate the proposed architecture, a prototype of a sales system has been developed. Through this implementation it was possible to analyze the impacts of the reconfiguration during a transaction / Mestrado / Sistemas Distribuidos / Mestre em Ciência da Computação

There is a revolutionary change in the world of work that impacts on the individual, work and society. The future of work suggests flexibility, boundary less communities and change in work, as we know it today. As the world of work changes from a worker intensive industrial society towards an automated information society, the retention of technological advantages e.g., human, intellect and knowledge capital is no longer assured. Employers struggle to retain their valuable high technology employees due to a general shortage of experienced candidates and aggressive recruitment tactics by others in the high technology arena. The purpose of this study is to investigate specific retention factors that induce organisational commitment and can thus increase the retention of high technology employees. High technology industries operate in volatile market and experience accelerating growth and rates of change. High technology employees are educated, have a strong preference for independence and hold a large portion of the organisation's intellectual capital. A core belief in human resources is to retain and develop employees to obtain a competitive advantage. In order to retain these valuable employees it has become necessary for organisations to transform from using an employee controlling to a more employee commitment driven strategy. To gain employees' commitment to the organisation and increase retention, the employer needs to identify which retention factors induce organisational commitment. Compensation, job characteristics, training and development opportunities, supervisor support, career opportunities and work/life policies were identified as the top six retention factors in the content analysis done on high technology literature. Organisational commitment has been defined as a mindset, which ties the individual to the organisation. Different forms and foci of organisational commitment are discussed with the approach developed by Meyer and Allen's three component model (1991). The consequences of organisational commitment benefit the organisation in terms of increased job performance, intention to stay, increase in attendance, loyalty, decrease in turnover, greater creativity, more co-operation (particularly across discipline specialities), more volunteerism and more time devoted to productive work on behalf of the organisation. This study focused on a 100% South African owned telecommunications company based in the Gauteng province. A questionnaire was developed and a population of 94 telecommunications professionals, technicians and associated professionals were selected to investigate the influence of various identified retention factors on organisational commitment. The statistical analysis of the data culminated in a regression analysis that measured the significance and the strength of the relationship between the identified retention factors and organisational commitment. The main conclusions were that compensation, job characteristics, supervisor support and work/life policies were significantly related to organisational commitment. On the other hand, in this study training, development and career opportunities were not related. High technology organisations are not just interested in the retention of employees but also creating a mutually beneficial interdependence with employees. The identified retention factors might serve as a means to demonstrate the organisation's support for, or commitment to, their employees and in turn cultivate a reciprocal attachment by employees. Employees' organisational commitment is related to their belief that the identified retention factors are motivated by the desire to retain good employees and to be fair in the treatment of employees. Future research needs are discussed. / Dissertation (MCom (Human Resources Management))--University of Pretoria, 2004. / Human Resource Management / unrestricted

This thesis deals with the structural design of front wheel hub of Formula Student the car categories in the CAD system. It includes comparison to proposal design of the hubs, different concept of wheel-seat and wheel suspension of a formula cars and a motor-cars. There is described a few version of design front wheel carrier. The first step is proposed assembly wheel of Formula Student and the next step is realized analytic simulation a stress by FEM of the front wheel carrier and his construction modifications.

Linklets are location-independent web services, which consume and produce Linked Data resources. These resources form a web of data - the semantic web - that is an abstraction of the web 2.0. However, enterprises are reluctant to provide valuable Linked Data resources due to missing financial stimuli. Operations are not representable in the semantic web. Linklets aim to solve both problems. Previous work developed a prototype. The goal of this thesis is to enhance it by a component model, a formal description and a permission model. A business model has to be developed. This thesis follows a bottom-up approach. The formalization of the Linklet concept creates a foundation. Then, an improved architecture and its reference implementation are studied. It is evaluated by tests, show cases and economic considerations. The resulting component system is based on web-service component systems, while a sandbox concept is the core of the permission model. The formal description shows limits of OWLs open world assumption. A platform leader strategy is the foundation for the business model. In conclusion, the advantages of the Linklet concept provide a way to enhance and monetize the value of the semantic web. Further research is required; the practical use has to be considered.

Linklets are location-independent web services, which consume and produce Linked Data resources. These resources form a web of data - the semantic web - that is an abstraction of the web 2.0. However, enterprises are reluctant to provide valuable Linked Data resources due to missing financial stimuli. Operations are not representable in the semantic web. Linklets aim to solve both problems. Previous work developed a prototype. The goal of this thesis is to enhance it by a component model, a formal description and a permission model. A business model has to be developed. This thesis follows a bottom-up approach. The formalization of the Linklet concept creates a foundation. Then, an improved architecture and its reference implementation are studied. It is evaluated by tests, show cases and economic considerations. The resulting component system is based on web-service component systems, while a sandbox concept is the core of the permission model. The formal description shows limits of OWLs open world assumption. A platform leader strategy is the foundation for the business model. In conclusion, the advantages of the Linklet concept provide a way to enhance and monetize the value of the semantic web. Further research is required; the practical use has to be considered.:1 Introduction 1.1 Motivation 1.2 Thesis 1.3 Contributions of This Work 1.4 Overview 2 Background 2.1 Preliminaries 2.1.1 Linked Data 2.1.2 Composition Models 2.1.3 Java 2 Security Permission Model 2.1.4 OSGi 2.1.5 Related Work 2.2 Formalization of Linklets 2.2.1 Definition 2.2.2 Analogy to Pipes and Filters 2.2.3 Analogy to Database Operators 2.2.4 Related Work 3 Enhancement of the Linklet Architecture 3.1 Linklet Composition 3.1.1 Requirements 3.1.2 Existing Approaches 3.1.3 Possible Approaches 3.1.4 Architecture 3.1.5 Outlook 3.2 Formal Description 3.2.1 Requirements 3.2.2 Mathematical Formalization 3.2.3 Existing Approaches 3.2.4 Architecture 3.2.5 Outlook 3.3 Permission Model 3.3.1 Requirements 3.3.2 Related Work 3.3.3 Permission Model 3.3.4 Security Architecture 3.3.5 Outlook 4 Implementation and Test 4.1 Implementation 4.1.1 Design Decisions 4.1.2 Static View 4.1.3 Dynamic View 4.2 Test 4.2.1 Test Plan 4.2.2 Test Design Specification 4.2.3 Test Realization 4.2.4 Test Results 5 Application Areas for Linklets 5.1 Business Model 5.1.1 Product Innovation 5.1.2 Infrastructure Management 5.1.3 Customer Interface 5.1.4 Financial Aspects 5.1.5 Conclusion 5.2 Show Cases for Linklets 5.2.1 Restaurant Scenario 5.2.2 Annotation Scenario 5.2.3 eBay Scenario 6 Discussion 6.1 Results 6.2 Evaluation 6.3 Future Work 6.4 Conclusion A Ontology B First Steps With Linklets B.1 Development of the Linklet Artifact B.1.1 Adoption of the LinkletActivator Class B.1.2 Development of the Linklet Class B.2 Start of the Linklet

Community-pharmacy is in a state of flux with a series of significant recent changes including the Community-pharmacy Contract, the reconstitution of the RPSGB and the General Pharmaceutical Council. There are also socio-cultural changes such as greater numbers of women in the profession, and an increase in pharmacists reducing their hours of work. The latter comes at a time when workload/roles are expanding and diversifying, leading to potential scenarios in which there are shortfalls between the hours worked and workload demands. This will have an impact on community pharmacists, but its magnitude may be dependent on how they are professionally and organisationally committed. Whilst there has been some promising commitment research in the USA, little research has been published in GB. However, multidimensional models of commitment have been researched extensively in other professions.A programme of research was developed and conducted to characterise and understand the role of professional and organisational commitment in community-pharmacy in GB using the Three-Component Model of commitment (TCM). Various methods were used to answer the research questions including focus-groups to assess qualitatively the contextual appropriateness of the constructs (stage 1.1), and cognitive-interviews to assess construct validity (stage 1.2). Stage 2 consisted of a large survey study, which examined the psychometric validity of the measurement scales as well as salient a-priori theoretical relationships found in both community pharmacy in GB and other professional contexts. A total of 32 participants were recruited for stage one and 713 community-pharmacists participated in stage two. Ethical approval was attained from the University of Manchester Ethics Committee for both stages one and two.The research found that beyond the affective facets of professional and organisational commitment both normative and continuance facets made significant, unique and yet varied contributions to the influence of both withdrawal-behaviours and work-performance behaviours in the community pharmacy population in GB. However, the levels and strengths of the different facets of professional and organisational commitment also appeared to differ amongst the different subgroups in community pharmacists in GB. For example, independent/small-chain pharmacists exhibited significantly higher levels of affective and normative organisational commitment and significantly lower levels of organisational withdrawal behaviours compared to large-multiple pharmacists. The implications of these and other differences were highlighted and recommendations made salient to the profession and community pharmacy organisations about how the levels of the different facets of commitment may be managed to foster greater work-performance behaviours and mitigate the different withdrawal behaviours.