63 research outputs found

    ETSI RRS - The Standardization Path to Next Generation Cognitive Radio Systems

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    This paper details the current work status of the ETSI Reconfigurable Radio Systems (RRS) Technical Committee (TC) and gives an outlook on the future evolution. While previous publications have presented an overview of ETSI RRS' main working axes related to i) Cognitive Radio System Aspects, ii) Radio Equipment Architecture (including a Cognitive Pilot Channel (CPC) proposal and a Functional Architecture (FA) for Management and Control of Reconfigurable Radio Systems), iii) Cognitive Management and Control and iv) Public Safety, this document focuses on latest progress related to UHF White Spaces work and the definition of an SDR Handset Architecture. In particular, it is outlined how Cognitive Radio principles can help to adapt existing and/or evolving Radio Standards, such as 3GPP Long Term Evolution, to a possible operation in UHF White Space bands

    Identificación del índice de vulnerabilidad territorial a partir de modelos jerárquicos y heurísticos aplicando SOA

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    Auxiliar de InvestigaciónEn el proyecto se realiza el diseño y desarrollo de 4 servicios web implementando los modelos de toma de decisión (AHP, AHP FUZZY, ELECTRE y PROMETHEE), encargados de procesar datos obtenidos en campo en la primera fase del proyecto que se realizó a través de encuestas, formatos de entrevistas, talleres y metodologías de análisis. Los datos se procesaran de acuerdo al modelo de toma de decisión seleccionado, generando como resultado final un indicador de vulnerabilidad territorial.PregradoIngeniero de Sistema

    A case comparison of a proportional hazards model and a stochastic filter for condition-based maintenance applications using oil-based condition monitoring information

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    The ability to predict the expected time remaining before a component fails is crucial when scheduling maintenance activities and component replacements. The current paper presents a comparison of the proportional hazards model and a probabilistic filtering approach when applied to the estimation of a components residual life using stochastically related oil-based wear information. The condition information is collected at irregular monitoring points from aircraft engines and consists of the concentrations of various contaminating metallic particles in an oil sample. Issues regarding the use of multiple information parameters are also addressed

    Pulmonary embolism after snake bite in a child with Diamond-Blackfan anemia

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    Diamond-Blackfan anemia (DBA) is a rare, congenital, pure red blood cell aplasia owing to gene defects affecting the function of ribosomal proteins, essential for erythroid maturation. Iron overload is a serious complication of chronic transfusions, which may lead to cardiac toxicity and endothelial damage. We report a case of pulmonary embolism, observed after viper bite in a transfusion-dependent child with DBA without known inherited thrombophilic factors. Embolic events are uncommon after viper bites, which they usually cause consumption coagulopathy, resulting in hypocoagulable state. DBA has not been earlier correlated with thrombotic episodes. In our patient, we suggest an iron overload-induced hypercoagulability state, which in the presence of a procoagulant substance lead to the development of a thromboembolic event. Copyright © 2011 by Lippincott Williams & Wilkins

    Multivariate Bayesian Control Chart

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