Análisis del protocolo ZigBee

En este trabajo se estudia el protocolo ZigBee de comunicaciones de datos en redes inalámbricas. El trabajo comienza ubicando a ZigBee dentro del contexto de redes. Para esto, se clasifican las mismas según su cobertura en: redes de área geográfica o WAN (Wide Area Network), redes de área local o LAN (Local Area Network) y redes de área personal o PAN (Personal Area Network). También se clasifican de acuerdo al modo de conexión de sus nodos en: con cable o sin cable. Se hace una comparación general de estándares inalámbricos en cuanto a consumo de potencia, capacidad de transmisión de datos y alcance. Con esto se ubica al estándar IEEE 802.15.4 destinado a cubrir con ventajas las aplicaciones de muy bajo consumo y baja velocidad de transmisión de datos. Se introduce el estándar ZigBee como una extensión del IEEE802.15.4 El trabajo continúa describiendo algunos de los muchos ejemplos de uso de ZigBee. Luego se estudia en profundidad cada una de las capas de ZigBee comenzando con la capa física hasta la capa aplicación. Se mencionan algunos aspectos de seguridad informática implementados en este protocolo. Por último se hace una comparación de ZigBee con otras tecnologías como Bluetooth en diferentes escenarios haciendo hincapié en el consumo energético.Facultad de Informátic

Caratterizzazione sperimentale di un motore ad effetto Hall da 5 kW

Caratterizzazione sperimentale di un motore ad effetto Hall da 5 kW di potenza, presso il laboratorio di Alta s.p.a. . La caratterizzazione si incentra sulla misura dei parametri di prestazione del propulsore, in funzionamento in una camera a vuoto, mediante bilancia di spinta e diagnostica del fascio mediante sonde di Faraday e sonde RPA

Interconectando sistemas de domótica

Desde los años 70, han aparecido diferentes ideas y tecnologías para el control inteligente de dispositivos eléctricos/electrónicos de una casa ó edificio. Este proyecto busca construir un puente entre los diferentes standards, de forma que se pueda utilizar una mezclar de las tecnologías existentes mejorando el desempeño global.Eje: Arquitectura, Redes y Sistemas OperativosRed de Universidades con Carreras en Informática (RedUNCI

Interconectando sistemas de domótica

Desde los años 70, han aparecido diferentes ideas y tecnologías para el control inteligente de dispositivos eléctricos/electrónicos de una casa ó edificio. Este proyecto busca construir un puente entre los diferentes standards, de forma que se pueda utilizar una mezclar de las tecnologías existentes mejorando el desempeño global.Eje: Arquitectura, Redes y Sistemas OperativosRed de Universidades con Carreras en Informática (RedUNCI

Un registrador de datos para modelar el comportamiento de la ballena

Este trabajo de investigación como objetivo modelar en un espacio 4D (X, Y, Z, Tiempo) el buceo de la ballena franca austral que ocupa áreas de desarrollo de actividades humanas, exponiéndose a un escenario de riesgo de colisión con embarcaciones. Este riesgo aumenta conforme aumenta la población de ballenas y las actividades en los puertos y aunque es posible recopilar datos por observación directa cuando están en superficie, resulta muy difícil interpretar sus movimientos durante sus fabricó un dispositivo para el registro de datos de aceleración en tres ejes, campo magnético en tres ejes, temperatura del agua, posición y velocidad tomados GPS, presión y conductividad que graban en una tarjeta microSD de alta capacidad.Eje: Procesamiento de Señales y Sistemas de Tiempo RealRed de Universidades con Carreras en Informática (RedUNCI

Pulmonar Granular Cell Tumor in a Horse

Background: The occurrence of neoplasms in horses is relatively low. Granular cell tumor is a seldom diagnosed neoplasm, usually benign, of mesenchymal origin. Controversies exist regarding its origin, which is possibly from Schwann cells or cells with neuroendocrine differentiation. Despite being one of the main primary neoplasms in the lungs of horses, the number of cases is low in comparison to that of secondary lung tumors. Thus, this study proposes to report the anatomopathological aspects in a horse with granular cell tumor of primary pulmonary origin. Case: An 11-year-old female Quarter Horse breed underwent exploratory right lateral thoracotomy after presenting with chronic respiratory changes. During the operation, tumor masses were found in the right and left caudal pulmonary lobes. Due to the severity of clinical respiratory signs and the extent of the lesions, the animal was subjected to euthanasia and anatomopathological examination. Upon necroscopic examination, a tumor mass was found in the middle third of the left caudal lobe, rounded to flattened, measuring 10.0 × 8.0 cm in height and length, white in color, of firm consistency, smooth and regular surface and rising to the lung surface. When sectioned, the mass showed to be composed of multiple firm and dense circular lobes, separated by a thin layer of connective tissue. The tumor invaded the lumen of nearby segmental and subsegmental bronchi, which were partially or totally obstructed by the mass. In the right lung, multiple similar nodules were observed, accompanied by peritumoral hemorrhage. Histopathological analysis of the new formation revealed a dense cluster of cells that expanded over the lung parenchyma. The neoplastic cells were pleomorphic, moderately cohesive, without defined borders, with abundant cytoplasm, densely eosinophilic and finely granular. Intracytoplasmic granules were well evidenced by periodic acid Schiff staining (PAS). The cell nucleus was rounded to oval, excentric, markedly basophilic and with dense chromatin. There was moderate anisocytosis and mild anisokaryosis, with rare mitotic figures. Immunohistochemical analysis revealed positive staining for anti-vimentin and anti-S100 antibodies, confirming the diagnosis of granular cell tumor.Discussion: Granular cell tumors have no predisposition as to breed, sex or age. However, most of the described cases are reported in female horses aged around 13 years. The advanced age of the diagnosed animals may be related to late definitive diagnosis, since the clinical signs are nonspecific and treated palliatively like other respiratory diseases. Macroscopically, this tumor is more common in the multinodular form and, as observed in this case, it has a greater capacity for infiltration. Histologically, the visualization of large, polygonal cells, with a wide cytoplasm containing eosinophilic granules leads to the diagnosis of granular cell tumor. However, PAS staining and immunohistochemical tests were essential for the diagnostic conclusion in this report, confirming the presence of cytoplasmic granules and the mesenchymal and neuroectodermal origin of this neoplasm, respectively. Thus, considering the low occurrence of pulmonary granular cell tumor, the description of this case contributes to the basis of the knowledge of medical-veterinary professionals about this tumor in its clinical and diagnostic aspects.Keywords: Schwann cells, immunohistochemistry, neoplasia, lung.Descritores: células de Schwann, imuno-histoquímica, neoplasia, pulmão.Título: Tumor de células granulares pulmonar em um equino

Un registrador de datos para modelar el comportamiento de la ballena

Este trabajo de investigación como objetivo modelar en un espacio 4D (X, Y, Z, Tiempo) el buceo de la ballena franca austral que ocupa áreas de desarrollo de actividades humanas, exponiéndose a un escenario de riesgo de colisión con embarcaciones. Este riesgo aumenta conforme aumenta la población de ballenas y las actividades en los puertos y aunque es posible recopilar datos por observación directa cuando están en superficie, resulta muy difícil interpretar sus movimientos durante sus fabricó un dispositivo para el registro de datos de aceleración en tres ejes, campo magnético en tres ejes, temperatura del agua, posición y velocidad tomados GPS, presión y conductividad que graban en una tarjeta microSD de alta capacidad.Eje: Procesamiento de Señales y Sistemas de Tiempo RealRed de Universidades con Carreras en Informática (RedUNCI

Epitope tagging of endogenous genes in diverse human cell lines

Epitope tagging is a powerful and commonly used approach for studying the physical properties of proteins and their functions and localization in eukaryotic cells. In the case of Saccharomyces cerevisiae, it has been possible to exploit the high efficiency of homologous recombination to tag proteins by modifying their endogenous genes, making it possible to tag virtually every endogenous gene and perform genome-wide proteomics experiments. However, due to the relative inefficiency of homologous recombination in cultured human cells, epitope-tagging approaches have been limited to ectopically expressed transgenes, with the attendant limitations of their nonphysiological transcriptional regulation and levels of expression. To overcome this limitation, a modification and extension of adeno-associated virus-mediated human somatic cell gene targeting technology is described that makes it possible to simply and easily create an endogenous epitope tag in the same way that it is possible to knock out a gene. Using this approach, we have created and validated human cell lines with epitope-tagged alleles of two cancer-related genes in a variety of untransformed and transformed human cell lines. This straightforward approach makes it possible to study the physical and biological properties of endogenous proteins in human cells without the need for specialized antibodies for individual proteins of interest

Morphometric assessment of canine heart without macroscopically visible changes caused by cardiac disease

The purpose of this study was to collect data on the cardiac morphometry of thirty adult male and female dogs without macroscopic changes indicative of heart disease, regardless of animal's body weight and score. The dogs were weighed, grouped according to their body weight, and necropsied for a macroscopic evaluation of their cardiac measurements. The data obtained were included in a database. The following cardiac measures were evaluated: vertical and horizontal axes, weight, volume, thickness of the right and left atria and ventricles, and horizontal and vertical axes of the atrial and ventricular chambers. The heart weight was found to represent 0.6 to 1.1% of the animal's body weight. No differences were found in cardiac size and weight as a function of sex. The ratio between the vertical and horizontal cardiac axes was 1.11. The left ventricle was found to be 1.6 to threefold thicker than the right ventricle. The results were considered standard for dogs and can be used for macroscopic evaluations of cardiac hypertrophy or dilation.Keywords: Atria; Dog; Heart chambers; Myocardium; Ventricle