Real Time Operating Systems
Mostrando 13-24 de 34 artigos, teses e dissertações.
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13. Real time methods for positive, negative sequence and/or harmonics extraction. / Método de extração em tempo real de seqüência positiva, negativa e/ou harmônicos.
Harmonics and unbalances cause several problems to equipments connected to AC mains. This work proposes a real time method to obtain the positive and negative sequence components and/or harmonics that requires no coordinate transformation neither signal filtering. Numerical simulation and experimental results are shown to validate the proposed method. As exa
Publicado em: 2007
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14. Dynamic loading and linking native code on a real-time operating system.
This thesis presents a very efficient and simple approach to native code generation and dynamic code loading for the RTOS RTEMS on the Blackfin architecture. The whole solution is intended for PLCs implementing the IEC 61131-3 standard. The second part of the solution, native code loading on RTEMS, is also usable for code updates in satellite applications. F
Publicado em: 2007
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15. Computation of voltage stability margins of power systems / Obtenção da margem minima de estabilidade de tensão de sistemas eletricos de potencia
This work presents a new and fast method for computing the minimum voltage stability margin of electric power systems. The computation of the voltage stability margin (VSM) is often required for the planning and operation of power systems. Usually, loads are increased along a predefined direction, which can be estimated based on historical data or load forec
Publicado em: 2007
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16. Measurements quality and redundancy evaluation for power system state estimation / Avaliação da qualidade e redundância das medidas para estimação de estado em sistemas elétricos de potência
The operating center requires much information in order to control and supervise the power systems. In a secure power systems operation it is important that the state estimation process be reliable. For that purpose, in this work: i) a computer program to evaluate and increment the reliability of power system in terms of redundancy and measurements availabil
Publicado em: 2007
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17. Desenvolvimento de sistema especialista com operacionalidade de aprendizado para operar em tempo real com sistemas industriais automatizados. / Development of expert system operating in real time with industrial automated systems with learning capacity.
Os Sistemas Supervisórios (SS) executam diversas funções vitais em um processo automatizado e também operam como interface homem-máquina. Os mesmos recebem informações de dispositivos como Controladores Lógicos Programáveis (CLP), inversores de freqüência, etc, e ao mesmo tempo enviam parâmetros de controle fornecidos pelos operadores do processo
Publicado em: 2007
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18. VOLTAGE CONTROL SENSITIVITY CALCULATION FOR VOLTAGE STABILITY OPERATIONAL REINFORCEMENT / ADEQUAÇÃO DAS AÇÕES DE CONTROLE DE TENSÃO EM SISTEMAS ELÉTRICOS OBJETIVANDO O REFORÇO DAS CONDIÇÕES DE SEGURANÇA DE TENSÃO
The voltage stability problem has been associated with environment questions and lack of financial resources for transmission system expansion. This reality together with the load growth makes the electrical system to be subject of heavy loadings, what can lead to situations of voltage collapse. The development of methods for evaluation of transmission netwo
Publicado em: 2007
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19. Point of colapse method applied to the analysis of critical contingencies in electrical power systems / Método do ponto de colapso aplicado na análise de contingências críticas em sistemas elétricos de potência
The constant complexity increase of the electrical power systems demands a continuous improvement of operation and control techniques. The current supervision and control centers are characterized by functions that process collected real-time information, in order to effectively control the systems and to keep them operating in accordance with a specified sc
Publicado em: 2007
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20. Projeto e simulação de um controle discreto para a plataforma multi-missão e sua migração para um sistema operacional de tempo real / Design and simulation of a discrete controller for the multi-mission platform and its migration to a real time operational system
This work uses the concepts of visual modeling, automatic code generation and code migration to real time operational systems. As a study case, a three axis stabilized artificial satellite with fine pointing was used, in its nominal operational mode. The dominance of this kind of technology will make it possible to Brazil, through the National Institute of S
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/04/2006
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21. Projeto e simulação de um controle discreto para a plataforma multi-missão e sua migração para um sistema operacional de tempo real / Design and simulation of a discrete controller for the multi-mission platform and its migration to a real time operational system
This work uses the concepts of visual modeling, automatic code generation and code migration to real time operational systems. As a study case, a three axis stabilized artificial satellite with fine pointing was used, in its nominal operational mode. The dominance of this kind of technology will make it possible to Brazil, through the National Institute of S
Publicado em: 2006
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22. A time Petri net based approach for software synthesis in Hard Real-Time embedded systems with multiple processors / A time Petri net based approach for software synthesis in Hard Real-Time embedded systems with multiple processors
Atualmente, sistemas embarcados sÃo ubÃquos. Em outras palavras, eles estÃo em todos os lugares. Desde utilitÃrios domÃsticos (ex: fornos microondas, refrigeradores, videocassetes, mÃquinas de fax, mÃquinas de lavar roupa, alarmes) atà equipamentos militares (ex: mÃsseis guiados, satÃlites espiÃes, sondas espaciais, aeronaves), nÃs podemos encont
Publicado em: 2006
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23. Framework de Kernel para um sistema de segurança imunologica
The alarming growth in the quantity and the sophistication of the attacks that threaten modem computer systems shows the need for new, more efticient security systems. In nature, there is a biological system that accomplishes this task with a remarkable efticiency: the human immune system. Not only this system is capable of assuring the survival of a human b
Publicado em: 2006
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24. Utilização do módulo "creatalink" para a transmissão, em tempo real, de sinais de correção para sistemas GPS diferenciais (DGPS) / Use of creatalink module to transmit in real time corrections signals for differential GPS (DGPS) systems
GPS is a radio navigation system base on a satellite network providing 24 hours radio data to determine point coordinates and world wide coverage. The precision is in the decametric range which is not adequate to many applications. DGPS or Differential GPS is a technique used to improve this precision down to metric level adding informa-tion to the receiver.
Publicado em: 2005