900 resultados para marca-passo artificial


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He encontrado en las fuentes consultadas, algo que se repite: no es fácil definir esta condición de la notoriedad ligada a los signos. La Jurisprudencia Alemana, como nos cuenta Carlos Fernández-Nóvoa, es pionera en esfuerzos creadores importantes para proteger el renombre de los signos sobrepasando las barreras del principio de especialidad. El Bundesgerichtshof Tribunal Supremo alemán, elaboró dos propuestas de protección: la Berühmte Marke para proteger a la marca renombrada frente al riesgo de debilitamiento, y la bekannte Marke para proteger a la marca conocida contra el aprovechamiento de su prestigio por parte de un tercero. La tesis que nos entrega Jorge Otamendi, es que hay varios grados de notoriedad y es tajante en relación con la no necesidad de probar lo que es notorio. No he querido elaborar una definición. El objetivo principal es llevar nuestra atención a trabajar en lo que ya todos hemos entendido: el nivel de conocimiento de la marca implantado en la mente del público. Ese es el requisito del derecho y del no derecho (principios no vinculantes) que pide el juez para obtener la certeza que necesita para dictar un fallo objetivo y motivarlo debidamente. Un fallo en el que el juzgador pueda decir que ha quedado demostrada, sin lugar a dudas, la habilidad intrínseca del signo, de ser recordado en la mayor parte del público, que es lo que logrará certeza en la mente del juzgador para proteger el derecho subjetivo del titular del signo notoriamente conocido. La investigación que se apoya en referencias bibliográficas de estudiosos de derecho de marcas, derecho civil y en jurisprudencia consta de dos partes, el primer capítulo sobre La notoriedad de la marca en la Comunidad Andina y el segundo sobre la actividad probatoria para la demostración de notoriedad. Una fuente de consulta que resultó inspiradora para demostrar que es posible cuantificar el renombre, ha sido el análisis empírico español realizado por un equipo de la Universidad Carlos III de Madrid.

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Aborda a la Responsabilidad Social Corporativa (RSC) como instrumento estratégico de Comunicación en la actual gestión empresarial; en este marco, el objetivo principal apunta a revelar y precisar el mensaje implícito de la RSC en el relato publicitario y el cómo esta herramienta de comunicación se torna un recurso estratégico que contribuye al valor de marca y su incremento a largo plazo. En este sentido, y previa a una introducción, la tesis consta de dos momentos claramente definidos; un marco teórico, comprendido por los dos primeros capítulos, en el cual se definen conceptos y categorías que acompañaran al desarrollo del trabajo de análisis (La RSC, Comunicación Estratégica, la Marca, la Publicidad, Semiótica del relato publicitario, entre los más importantes). Y un segundo momento, constituido por el tercer capítulo, en el que se presenta y examina, de manera general, el escenario de la RSC en la empresa Telefónica, posterior se lleva a cabo el análisis semiótico del spot “Mi papá trabaja en Movistar”, pieza publicitaria emitida en el año 2008. Finalmente, se generan conclusiones y recomendaciones de dicho trabajo.

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La investigación que se presenta a continuación permite diseñar una estrategia alternativa para el SRI (Servicio de Rentas Internas), dirigida a optimizar los recursos comunicacionales utilizados en herramientas alternativas para el fomento de la Cultura Tributaria en el Ecuador. De acuerdo a las investigaciones y a los datos recogidos, la participación de parte de la ciudadanía se ha incrementado de sorteo en sorteo, pero ahora se pretende establecer cuál es el nivel de conciencia que se ha desarrollado en la sociedad respecto a su responsabilidad para transparentar las transacciones comerciales, lo que ayudará a la reducción del nivel de evasión tributaria. A través de las encuestas se ha determinado que la ciudadanía conoce de la existencia de la “Lotería Tributaria”, pero específicamente en la agencia Norte, objeto del estudio, se ha definido que existe falta de información respecto a los requisitos para calificar para el sorteo. En la estrategia diseñada se considera la localización de la propuesta para generar capacidades en la población mediante mecanismos participativos de gestión de la información respecto a la Lotería Tributaria y a su objetivo principal, es decir impulsar y fomentar la Cultura tributaria en el Ecuador. Se proponen mecanismos que faciliten la interacción de la institución con la ciudadanía y que mejoren la participación en el Norte de la ciudad de Quito.

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El ensayo explora tres posibles lecturas del concepto de verdad en Respiración artificial, de Ricardo Piglia, mediante el análisis de tres personajes: el novelista Renzi, el historiador Maggi y el filósofo Tardewski. Cada uno constituye, según su oficio, una representación de la verdad. La verdad histórica es relativizada por la verdad de la ficción personificada por Renzi, y esta encuentra un fundamento narrativo en la investigación histórica que Maggi desarrolla. La verdad filosófica de Tardewski permanece aislada e íntegra. La clave del texto es el descubrimiento de que la verdad de la razón filosófica es el villano de la novela, pues constituye una fuerza tiránica, totalitaria y devastadora, cuya lejanía de los hechos reales le impide explicarlos y darles sentido.

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Waved albatrosses often relocate their eggs during incubation by placing the egg between the tarsi and shuffling forward. This behavior frequently results in eggs becoming lodged between rocks, accounting for at least 10%, and perhaps as much as 80%, of breeding failures. Because albatross populations worldwide are currently threatened, artificial means of augmenting reproductive success may be necessary to mitigate losses caused by anthropogenic effects. We characterize the frequency and extent of egg movement; test several hypotheses related to microhabitat, timing, and incubation location to explain the behavior; and investigate the utility of repositioning lodged eggs in a location in which breeding birds might resume incubation. Egg rescue increased both the likelihood of continued incubation as well as the hatching rate in our experiment, and provides an efficient, low-cost management option for this species.

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We examined nest site selection by Puerto Rican Parrots, a secondary cavity nester, at several spatial scales using the nest entrance as the central focal point relative to 20 habitat and spatial variables. The Puerto Rican Parrot is unique in that, since 2001, all known nesting in the wild has occurred in artificial cavities, which also provided us with an opportunity to evaluate nest site selection without confounding effects of the actual nest cavity characteristics. Because of the data limitations imposed by the small population size of this critically endangered endemic species, we employed a distribution-free statistical simulation approach to assess site selection relative to characteristics of used and unused nesting sites. Nest sites selected by Puerto Rican Parrots were characterized by greater horizontal and vertical visibility from the nest entrance, greater density of mature sierra palms, and a more westerly and leeward orientation of nest entrances than unused sites. Our results suggest that nest site selection in this species is an adaptive response to predation pressure, to which the parrots respond by selecting nest sites offering advantages in predator detection and avoidance at all stages of the nesting cycle. We conclude that identifying and replicating the “nest gestalt” of successful nesting sites may facilitate conservation efforts for this and other endangered avian species.

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Deep Brain Stimulator devices are becoming widely used for therapeutic benefits in movement disorders such as Parkinson's disease. Prolonging the battery life span of such devices could dramatically reduce the risks and accumulative costs associated with surgical replacement. This paper demonstrates how an artificial neural network can be trained using pre-processing frequency analysis of deep brain electrode recordings to detect the onset of tremor in Parkinsonian patients. Implementing this solution into an 'intelligent' neurostimulator device will remove the need for continuous stimulation currently used, and open up the possibility of demand-driven stimulation. Such a methodology could potentially decrease the power consumption of a deep brain pulse generator.

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Modern methods of spawning new technological motifs are not appropriate when it is desired to realize artificial life as an actual real world entity unto itself (Pattee 1995; Brooks 2006; Chalmers 1995). Many fundamental aspects of such a machine are absent in common methods, which generally lack methodologies of construction. In this paper we mix classical and modern studies in order to attempt to realize an artificial life form from first principles. A model of an algorithm is introduced, its methodology of construction is presented, and the fundamental source from which it sprang is discussed.

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We have investigated the use of a laminin coated compressed collagen gel containing corneal fibroblasts (keratocytes) as a novel scaffold to support the growth of corneal limbal epithelial stem cells. The growth of limbal epithelial cells was compared between compressed collagen gel and a clinically proven conventional substrate, denuded amniotic membrane. Following compression of the collagen gel, encapsulated keratocytes remained viable and scanning electron microscopy showed that fibres within the compressed gel were dense, homogeneous and similar in structure to those within denuded amniotic membrane. Limbal epithelial cells were successfully expanded upon the compressed collagen resulting in stratified layers of cells containing desmosome and hemidesmosome structures. The resulting corneal constructs of both the groups shared a high degree of transparency, cell morphology and cell stratification. Similar protein expression profiles for cytokeratin 3 and cytokeratin 14 and no significant difference in cytokeratin 12 mRNA expression levels by real time PCR were also observed. This study provides the first line of evidence that a laminin coated compressed collagen gel containing keratocytes can adequately support limbal epithelial cell expansion, stratification and differentiation to a degree that is comparable to the leading conventional scaffold, denuded amniotic membrane.

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Field populations of earthworms have shown a varied response in mortality to the fungicide carbendazim, the toxic reference substance used in agrochemical field trials. The aim of this study was to determine the influence of soil conditions as a potential cause of this variation. Laboratory acute toxicity tests were conducted using a range of artificial soils with varying soil components (organic matter, clay, pH and moisture). Batch adsorption/desorption studies were run to determine the influence of the soil properties on carbendazim behaviour. Adsorption was shown to be correlated with organic matter content and pH and this in turn could be linked to Eisenia fetida mortality, with lower mortality occurring with increased adsorption. Overall while E.fetida mortality did vary significantly between several of the soils the calculated LC50 values in the different soils did not cover a wide range (6.04-16.00 mg kg(-1)), showing that under these laboratory conditions soil components did not greatly influence carbendazim toxicity to E.fietida. (c) 2007 Elsevier Masson SAS. All rights reserved.

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Invasive plant species have been shown to alter the microbial community composition of the soils they invade and it is suggested that this below-ground perturbation of potential pathogens, decomposers or symbionts may feedback positively to allow invasive success. Whether these perturbations are mediated through specific components of root exudation are not understood. We focussed on 8-hydroxyquinoline, a putative allelochemical of Centaurea diffusa (diffuse knapweed) and used an artificial root system to differentiate the effects of 8-hydroxyquinoline against a background of total rhizodeposition as mimicked through supply of a synthetic exudate solution. In soil proximal (0-10 cm) to the artificial root, synthetic exudates had a highly significant (P < 0.001) influence on dehydrogenase, fluorescein diacetate hydrolysis and urease activity. in addition, 8-hydroxyquinoline was significant (p = 0.003) as a main effect on dehydrogenase activity and interacted with synthetic exudates to affect urease activity (p = 0.09). Hierarchical cluster analysis of 16S rDNA-based DGGE band patterns also identified a primary affect of synthetic exudates and a secondary affect of 8-hydroxyquinoline on bacterial community structure. Thus, we show that the artificial rhizosphere produced by the synthetic exudates was the predominant effect, but, that the influence of the 8-hydroxyquinoline signal on the activity and structure of soil microbial communities could also be detected. (C) 2009 Elsevier Ltd. All rights reserved.

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Two experiments examined the claim for distinct implicit and explicit learning modes in the artificial grammar-learning task (Reber, 1967, 1989). Subjects initially attempted to memorize strings of letters generated by a finite-state grammar and then classified new grammatical and nongrammatical strings. Experiment 1 showed that subjects' assessment of isolated parts of strings was sufficient to account for their classification performance but that the rules elicited in free report were not sufficient. Experiment 2 showed that performing a concurrent random number generation task under different priorities interfered with free report and classification performance equally. Furthermore, giving different groups of subjects incidental or intentional learning instructions did not affect classification or free report.

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Ant colonies in nature provide a good model for a distributed, robust and adaptive routing algorithm. This paper proposes the adoption of the same strategy for the routing of packets in an Active Network. Traditional store-and-forward routers are replaced by active intermediate systems, which are able to perform computations on transient packets, in a way that results very helpful for developing and dynamically deploying new protocols. The adoption of the Active Networks paradigm associated with a cooperative learning environment produces a robust, decentralized routing algorithm capable of adapting to network traffic conditions.