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Search Results: 1 - 10 of 434238 matches for " Antonio Manuel R. C. Grilo "
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Dynamic Programming Optimization of Multi-rate Multicast Video-Streaming Services
Nestor Michael Ca?os Tiglao,Janio Miguel E.F. Monteiro,Antonio Manuel R. C. Grilo,Mario Serafim S. Nunes
Science Diliman , 2010,
Abstract: In large scale IP Television (IPTV) and Mobile TV distributions, the video signal is typically encoded and transmitted using several quality streams, over IP Multicast channels, to several groups of receivers, which are classified in terms of their reception rate. As the number of video streams is usually constrained by both the number of TV channels and the maximum capacity of the content distribution network, it is necessary to find the selection of video stream transmission rates that maximizes the overall user satisfaction. In order to efficiently solve this problem, this paper proposes the Dynamic Programming Multi-rate Optimization (DPMO) algorithm. The latter was comparatively evaluated considering several user distributions, featuring different access rate patterns. The experimental results reveal that DPMO is significantly more efficient than exhaustive search, while presenting slightly higher execution times than the non-optimal Multi-rate Step Search (MSS) algorithm.
Interaction between Calpain 5, Peroxisome proliferator-activated receptor-gamma and Peroxisome proliferator-activated receptor-delta genes: a polygenic approach to obesity
María E Sáez, Antonio Grilo, Francisco J Morón, Luis Manzano, María T Martínez-Larrad, Antonio González-Pérez, Javier Serrano-Hernando, Agustín Ruiz, Reposo Ramírez-Lorca, Manuel Serrano-Ríos
Cardiovascular Diabetology , 2008, DOI: 10.1186/1475-2840-7-23
Abstract: To investigate the possibility of the existence of a crosstalk between the CALPAIN 10 homologue CALPAIN 5 and nuclear receptors of the peroxisome proliferator-activated receptors family.Cross-sectional, genetic association study and gene-gene interaction analysis.The study sample comprise 1953 individuals, 725 obese (defined as body mass index ≥ 30) and 1228 non obese subjects.In the monogenic analysis, only the peroxisome proliferator-activated receptor delta (PPARD) gene was associated with obesity (OR = 1.43 [1.04–1.97], p = 0.027). In addition, we have found a significant interaction between CAPN5 and PPARD genes (p = 0.038) that reduces the risk for obesity in a 55%.Our results suggest that CAPN5 and PPARD gene products may also interact in vivo.Obesity, which is among of the most hereditable human conditions (45–75%), is, with few exceptions, a polygenic disorder determined by an unknown number of genes with mild to moderate individual effects that also interacts with the environment to produce the phenotype. The importance of the genetic component in obesity has been assessed by the observation of familial aggregation, prevalence differences among ethnic groups and concordance rates in twin studies [1]. Association analysis has been the more successful strategy for the identification of these genetic factors, but these studies are not always replicated in subsequent analyses and only a small proportion of these genes have been consistently associated with the disease [2]. This situation is mainly due to small single gene effects, reason why, genetic association analysis can be strongly influenced by sample size, population structure and allele frequency. Thus, the polygenic approach is arising as the next landmark for the study of common complex diseases [3,4].The peroxisome proliferator-activated receptors (PPARs) belong to a nuclear receptor (NR) superfamily of ligand-inducible transcription factors that form functional complexes with the retinoid × recepto
Crowbar System in Doubly Fed Induction Wind Generators
Maurício B. C. Salles,Kay Hameyer,José R. Cardoso,Ahda. P. Grilo,Claudia Rahmann
Energies , 2010, DOI: 10.3390/en3040738
Abstract: In the last 15 years, the use of doubly fed induction machines in modern variable-speed wind turbines has increased rapidly. This development has been driven by the cost reduction as well as the low-loss generation of Insulated Gate Bipolar Transistors (IGBT). According to new grid code requirements, wind turbines must remain connected to the grid during grid disturbances. Moreover, they must also contribute to voltage support during and after grid faults. The crowbar system is essential to avoid the disconnection of the doubly fed induction wind generators from the network during faults. The insertion of the crowbar in the rotor circuits for a short period of time enables a more efficient terminal voltage control. As a general rule, the activation and the deactivation of the crowbar system is based only on the DC-link voltage level of the back-to-back converters. In this context, the authors discuss the critical rotor speed to analyze the instability of doubly fed induction generators during grid faults.
Living bacteria rheology: population growth, aggregation patterns and cooperative behaviour under different shear flows
P. Patricio,P. L. Almeida,R. Portela,R. G. Sobral,I. R. Grilo,T. Cidade,C. R. Leal
Physics , 2014, DOI: 10.1103/PhysRevE.90.022720
Abstract: The activity of growing living bacteria was investigated using real-time and in situ rheology -- in stationary and oscillatory shear. Two different strains of the human pathogen Staphylococcus aureus -- strain COL and its isogenic cell wall autolysis mutant -- were considered in this work. For low bacteria density, strain COL forms small clusters, while the mutant, presenting deficient cell separation, forms irregular larger aggregates. In the early stages of growth, when subjected to a stationary shear, the viscosity of both strains increases with the population of cells. As the bacteria reach the exponential phase of growth, the viscosity of the two strains follow different and rich behaviours, with no counterpart in the optical density or in the population's colony forming units measurements. While the viscosity of strain COL keeps increasing during the exponential phase and returns close to its initial value for the late phase of growth, where the population stabilizes, the viscosity of the mutant strain decreases steeply, still in the exponential phase, remains constant for some time and increases again, reaching a constant plateau at a maximum value for the late phase of growth. These complex viscoelastic behaviours, which were observed to be shear stress dependent, are a consequence of two coupled effects: the cell density continuous increase and its changing interacting properties. The viscous and elastic moduli of strain COL, obtained with oscillatory shear, exhibit power-law behaviours whose exponent are dependent on the bacteria growth stage. The viscous and elastic moduli of the mutant have complex behaviours, emerging from the different relaxation times that are associated with the large molecules of the medium and the self-organized structures of bacteria. These behaviours reflect nevertheless the bacteria growth stage.
Percutaneous implantation of endoprostheses in the carotid arteries
Costa Jr., José Ribamar;Cano, Manuel N.;Oliveira, Dinaldo C.;Kambara, Antonio M.;Moreira, Adriana C.;Queiroz, Rogério;Cano, Silvia;Sousa, Amanda G.M.R.;Sousa, J. Eduardo M.R.;
Arquivos Brasileiros de Cardiologia , 2003, DOI: 10.1590/S0066-782X2003000100007
Abstract: objective: to assess the in-hospital evolution of patients undergoing percutaneous stent placement in the carotid arteries. methods: from august 1996 to april 2001, we studied 86 patients with carotid arterial obliterative lesions > 70% who were treated with percutaneous stent placement in the carotid arteries. we assessed the rate of success of the implantation and of the procedure, the types of stents used, mortality rate, and neurological complications. results: successful implantation was obtained in 98.9% of the cases, and the procedure was successful in 91.8%. the wallstent was the most frequently used stent (73 patients - 77%). cerebral strokes occurred as follows: 3 (3.2%) transient ischemic attacks, 1 (1.1%) minor stroke, and 3 (3.1%) major strokes. one (1.1%) patient died during hospitalization. conclusion: the high rate of success of stent implantation (98.9%) in addition to the low rate of cerebral stroke/death (4.2%) showed the efficiency and safety of percutaneous stent placement in carotid arteries.
Jóvenes chilenos y construcción socioimaginaria del Ser-Otro Mujer
Aravena R,Andrea ?; Baeza R,Manuel Antonio ?;
Ultima década , 2010, DOI: 10.4067/S0718-22362010000100009
Abstract: the objective of this article is to present the major results of research of a project which has the knowledge of the end result how chileans socially construct the otherness of the other woman-being, indigenous and immigrant. specifically it aboards the perspective of youth in relation to the socio-image of the adult world, respecting the other woman-being. the central argument of this article is to re-affirm that the familiar ?machismo? forms a part of the chilean identity, understood as a social construction and is imaginary, and, as a result of this act of symbolic violence, our traditional culture has finally given this assertion. however, continuities and ruptures on the dominant discourse about the alleged inferiority of women seen in contemporary chilean society. in the context of a globalized world are the youth who speed up the movement that is gradually changing gender relations, through critical views of the past and new social practices.
JóVENES CHILENOS Y CONSTRUCCIóN SOCIOIMAGINARIA DEL SER-OTRO MUJER
ANDREA ARAVENA R.,MANUEL ANTONIO BAEZA R.
Ultima Década , 2010,
Abstract: El presente artículo muestra los principales resultados de un proyecto de investigación que tuvo por finalidad conocer cómo las y los chilenos construyen socialmente la alteridad del ser-otro mujer, indígena e inmigrante. Específicamente, se aborda la perspectiva de la juventud en relación con los discursos socioimaginarios del mundo adulto y respecto del ser-otro mujer. Uno de los argumentos centrales de este artículo afirma que el consabido machismo forma parte de la identidad chilena, entendida como una construcción socioimaginaria. Y que, producto de este acto identitario fundacional de violencia simbólica, nuestra cultura tradicional finalmente da cuenta de esta aseveración. Sin embargo, se observan en la sociedad chilena contemporánea ciertas continuidades y rupturas en el discurso dominante acerca de una presunta inferioridad de la mujer. En el marco de un mundo globalizado, los y las jóvenes, a través de visiones críticas del pasado y de nuevas prácticas sociales, aceleran un movimiento que, paulatinamente, va cambiando las relaciones de género.
INFLUENZA A H1N1 DE ORIGEN PORCINO: Métodos diagnósticos
Vargas-Córdoba,Manuel Antonio;
Revista Facultad de Medicina de la Universidad Nacional de Colombia , 2010,
Abstract: the diagnosis of infection by influenza viruses relays on direct and indirect virologic techniques. different diagnostic tests have variable sensitivities and specificities depending to a large extent on the genetic and antigenic features of the circulating virus. when a new viral variant appears, commercially available tests must be validated in order to verify their performance at detecting the new virus. if a low sensitivity or specificity is found, tests must be adjusted in order to improve their detection power for the new agent. there are multiple diagnostic tests, each one with its own advantages and limitations; so the selection of a test will depend on the specific conditions of a particular diagnostic laboratory.
Estrategias de fijación de precios no lineales
Manuel Castillo Soto,Antonio Cárdenas Almagro
Análisis Económico , 2010,
Abstract: La Estrategia de fijación de precios (efp) sigue siendo el mecanismo más eficiente que utilizan las empresas para recuperar los costos realizados y asegurarse una determinada rentabilidad, es decir es un medio para capturar valor, siempre y cuando estas empresas hayan sido capaces de generarlo. Dicha estrategia se ha sofisticado a través de los a os, buscando siempre hacer la captura de valor en la forma más eficiente posible. El sustancial incremento en el poder de compra del consumidor, la gran variedad de bienes y servicios que se ofrecen, el gran monto de información disponible, la facilidad de la interacción entre clientes y proveedores, la posibilidad de comparar diferentes precios, la forma de colectar información acerca de mercados, consumidores y competidores, hacen necesario analizar los diferentes mecanismos de captura de valor, a través del estudio de la formulación estratégica de fijación de precios.
INFLUENZA A H1N1 DE ORIGEN PORCINO: Métodos diagnósticos Influenza A H1N1 swine origin: diagnostic methods
Manuel Antonio Vargas-Córdoba
Revista Facultad de Medicina de la Universidad Nacional de Colombia , 2010,
Abstract: El diagnóstico de la infección por virus influenza reposa sobre técnicas virológicas directas e indirectas. Las diferentes pruebas diagnósticas poseen niveles de sensibilidad y especificidad variables que dependen en gran parte de las características genéticas y antigénicas del virus circulante. En el caso de la aparición de una nueva variante viral las pruebas disponibles en el mercado deben ser validadas para comprobar su eficiencia de detección para el nuevo virus. En caso de baja sensibilidad y especificidad, las pruebas deben ajustarse con el fin de mejorar su poder de detección del nuevo agente. Existen múltiples pruebas diagnósticas que presentan cada una sus ventajas y limitaciones y su selección dependerá de las condiciones específicas de cada laboratorio diagnóstico. The diagnosis of infection by influenza viruses relays on direct and indirect virologic techniques. Different diagnostic tests have variable sensitivities and specificities depending to a large extent on the genetic and antigenic features of the circulating virus. When a new viral variant appears, commercially available tests must be validated in order to verify their performance at detecting the new virus. If a low sensitivity or specificity is found, tests must be adjusted in order to improve their detection power for the new agent. There are multiple diagnostic tests, each one with its own advantages and limitations; so the selection of a test will depend on the specific conditions of a particular diagnostic laboratory.
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