Objective Fault
Mostrando 13-24 de 33 artigos, teses e dissertações.
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13. Fault detection in communication systems / Detecção de falhas em sistemas de comunicações
The present work is focused in the area of fault detection in communications systems using billing tickets archives as base of information. In most of the cases, these archives are used by the telecommunication carriers only for billing purposes. The thesis presents algorithms for fault detection and consequence alarms generation. The algorithms are analyzed
Publicado em: 2008
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14. Adaptação do método de Wiszniewski para agregar maior exatidão à localização de faltas em linhas de transmissão com dados de um terminal
Transmission line automatic fault location using data from only one terminal (local terminal) takes into consideration some simplifications to allow the estimation without data from other terminal (remote terminal). The use of these methods, when the fault has high fault resistance, generally produces estimative with inacceptable high errors intended to prac
Publicado em: 2008
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15. DetecÃÃo de mÃdulos de software propensos a falhas atravÃs de tÃcnicas de aprendizagem de mÃquina
The success of software depends directly on its quality. Traditionally, formal methods and manual code inspection are used to assure it. Generally, such methods have a high cost and demand a lot of time. Therefore, tests should be carefully planned to avoid waste of resources. Nowadays, companies are looking for faster and cheaper ways to detect software def
Publicado em: 2008
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16. Localização de faltas em linhas de transmissão: desenvolvimento de novos algoritmos e implementação de sistema computacional para aplicações práticas
Transmission line automatic fault location allows to estimate the approximate point at the line where the short-circuit occurs, using voltage and current data from one or more of its ends. The maintenance team can reach the fault local and restore the operational conditions fast and more efficiently, increasing the reliability of the power electric system an
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/06/2007
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17. Estudo de confiabilidade de compressores alternativos semi-herméticos de sistemas de refrigeração. / Reliability study of reciprocating compressors of refrigeration systems.
Refrigeration systems are reparable systems. This means that one can perform maintenance actions on them several times during the system life cycle. The most common refrigeration system is the vapor compression cycle. In this cycle, the compressor is the most complex and expensive component. So, the user should take special care because , beside problems lik
Publicado em: 2007
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18. Um modelo de composição de detectores de intrusão heterogêneos baseado em conjuntos difusos
The performance of an intrusion detector depends on several factors, like its internal architecture and the algorithms employed. Thus, distinct detectors can behave distinctly when submitted to the same event flow. The project diversity theory has been successfully used in the fault tolerance domain, and can bring benefits to the intrusion detection area. Th
Publicado em: 2007
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19. New formulations for the reconfiguration problem in energy distribution systems. / Novas formulações para o problema de reconfiguração de redes de distribuição de energia elétrica.
The reconfiguration of electricity distribution systems is concerned with finding the state of switching and protective devices so as to optimize a given objective function, which is usually defined as minimization of total loss, fault isolation, load balancing among feeders, or improvement of voltage profile. In this work, the objective function is defined
Publicado em: 2007
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20. A responsabilidade civil dos hospitais privados
In recent years, under the liability, grew too much in the number of indemnities demands against private hospitals, especially under the allegation of medical mistakes. The doctor makes mistakes because he is human and makes mistakes because he had a poor training, because it is lacking residence for all graduated from schools of medicine, because he works t
Publicado em: 2007
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21. Condicionantes geoambientais no processo histórico da ocupação territorial do município de Guarulhos, Estado de São Paulo
The objective of this study is to examine the relationship between geoenvironmental parameters and the historical processes of land use and occupation of the Guarulhos municipal area, from the 16th century until present day. The city of Guarulhos, located in the Greater São Paulo Area, holds the second largest urban population in the State of São Paulo, es
Publicado em: 2007
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22. Modelagem endoscÃpica virtual do monitoramento de equipamentos elÃtricos de alta tensÃo
With the promulgation of the 10.847/2004 and 10.848/2004 Laws, the Brazilian Power Sector started adopting competitiveness as the main element for obtaining concessions in the electric power system transmission and generation sectors. In this sense, the power sector companies will have to strongly intensify the monitoring processes of the power system equipm
Publicado em: 2007
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23. Tolerance the Imperfections for the NIDIA: a Detection system of Intrusion Based on Intelligent Agents / Tolerância a Falhas para o NIDIA: um Sistema de detecção de Intrusão Baseado em Agentes Inteligentes
An Intrusion Detection System (IDS) is one tool among several existing ones to provide safety to a computational system. The IDS has the objective of identifying individuals that try to use a system in non-authorized way or those that have authorization but are abusing of their privileges. However, to accomplish the functions correctly an IDS needs to guaran
Publicado em: 2006
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24. Use of Adaptive Filtering for Fault Detection on Ball Bearings / Utilização de filtros adaptativos para detecção de falhas em mancais de rolamentos
The analysis of vibrations constitutes one of the powerful tools destined for predictive maintenance. In this context, and with the objective of contributing to the improvement of the process of detection and diagnosis of ball bearing faults, the use of the technique of adaptive filtering applied to vibration signals is focused in this work, through the mini
Publicado em: 2006