Reliability Engineering
Mostrando 25-36 de 66 artigos, teses e dissertações.
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25. A software component quality framework
A major problem with Component-Based Software Engineering (CBSE) is the quality of the components used in a system. The reliability of a componentbased software system depends on the reliability of the components that it is made of. In CBSE, the proper search, selection and evaluation process of components is considered the cornerstone for the development of
Publicado em: 2009
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26. A modified lightly doped drain mosfet for very large scale integration
Reducing MOSFET dimensions while maintaining a constant supply voltage leads to higher electric fields inside the active regions of VLSI transistors. Operation of micron and submicron MOSFETs in the presence of high-field effects has required design innovations so that a constant supply voltage, acceptable punchthrough voltage, and long-term reliability are
Publicado em: 2009
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27. Novel and faster ways for solving semi-markov processes: mathematical and numerical issues
Continuous-time semi-Markov processes (SMP) are important stochastic tools for modeling reliability metrics over time for systems where the future behavior depends on the current and next states as well as on sojourn times. The classical approach for solving the interval transition probabilities of SMP consists of directly applying any general quadrature met
Publicado em: 2009
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28. GEOWEB, um facilitador para a aprendizagem em geotecnia / GEOWEB, a facilitator for learning in geotechnical
Historically and with more emphasis on the international level, efforts have been dedicated in the design and implementation of Learning Objects for the teaching of soil mechanics courses in Civil Engineering, in particular, to the topic of Water Movement in Soil. Following this vision, this paper examines the relationship between teaching and learning in th
Publicado em: 2009
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29. Aplicação da análise de sobrevivência na estimativa da vida útil de componentes construtivos
Este trabalho foi elaborado, na tentativa de se aplicar as técnicas e os conceitos que são empregadas na Análise de Sobrevivência, na medicina e aplicá-los na Engenharia Civil, na área de construção. Essas técnicas recebe o nome de Confiabilidade, onde permite estimar a vida útil de componentes construtivos, através de modelos probabilísticos mai
Publicado em: 2009
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30. Incorporação quantitativa de dados de sismica 4D no processo de ajuste de historico / Quantitative incorporation of seismic 4D in history matching process
Good decision making related to oilfield management depends on reliability of production forecast which demands calibrated reservoir simulation models. Due to the complexity of the production history matching process, there are many models with reasonable match but, many times, with different forecasts, mainly due to important heterogeneities that are not ob
Publicado em: 2009
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31. Proposta de metodologia para utilização em hardware reconfigurável para aplicações aeroespaciais / Proposal methodology for use in reprogrammable hardware in aerospace applications
The CBERS program is a partnership between Brazil and China to produce satellites for remote sensing, producing images of the Earth for studies in several areas, mainly the ones related to the sustainable exploitation of natural resourses. The methodology proposed in this work will be applied on the satellite CBERS-3 e 4s Multispectral Camera (MUXCAM), the f
Publicado em: 2008
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32. OtimizaÃÃo multiobjetivo da confiabilidade via sistemas multiagentes baseado em colÃnia de formigas
This dissertation presents the modeling, implementation and results of a multiagent system based on ant colony metaheuristic to solve multiobjectve problems on reliability engineering area. We will consider redundancy allocation and periodic tests policy problems. High reliability and low associated costs are objectives of all systems projects. Meanwhile, in
Publicado em: 2008
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33. Gerência de projetos de software livre no framework SAFE
The open source software theme has become an important area of Software Engineering study and research, earning its space as a ramification of the Traditional Software Engineering, defined as Open Source Software Engineering (OSSE). Several communities have obtained success in developing open source software based solutions, among them: Mozilla, Apache and L
Publicado em: 2008
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34. Risco e confiabilidade sobre estruturas combinatÃrias : uma modelagem para redes elÃtricas
Reability of an component is the probability that it perform its functions under specific conditions. Unlike the concept of reliability is the concept of risk, which is defined as the probability of failure versus the cost associating with such failure. Mathematical models are often used in engineering projects and the analysis of reliability, robustness and
Publicado em: 2008
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35. Modelling and evaluation of industrial plants useful life extension / Modelagem e avaliação da extensão da vida útil de plantas industriais
During the useful life of an industrial plant, the failure occurrence follows an exponential distribution. However, the aging process in an industrial plant generates an increase of the failure number. The failure probability is a rating for the maintenance stopping process. In this paper, an statistical method for the assessment of the failure probability a
Publicado em: 2008
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36. A Contribution to the Estimation of Indicators of the Operational State of Insolated Power Cables with Water Trees / Uma contribuição à estimativa de indicadores de desempenho do estado operacional de cabos isolados sob a ação das arborescências
Distinct matters related to power quality challenges represent areas of growing interest for the electric engineering community. By considering the subject of power supply with quality and reliability, the continuity of the supply appears as a very important task to be fulfilled. As a matter of fact, the occurrence of failures in components and installations
Publicado em: 2008