1,721,005 research outputs found
El progreso tecnológico, atado a la evolución de la electrónica
Get PDFFil: Lutenberg, Ariel. Universidad de Buenos Aires. Facultad de Ingeniería; ArgentinaFil: Venturino, Gabriel. Universidad de Buenos Aires. Facultad de Ingeniería; ArgentinaLos equipos electrónicos son cada vez más poderosos y más baratos. Por estas razones se utilizan en todo tipo de aplicaciones, como la medicina, la seguridad, las comunicaciones, los entretenimientos y hasta el control del tráfico. ¿Cómo es posible que estos sistemas logren simultáneamente una reducción en el costo y un aumento en su funcionalidad
On the Trade-off between Power Consumption and Time Synchronization Quality for Moving Targets under Large-Scale Fading Effects in Wireless Sensor Networks
Get PDFIn this work we find a lower bound on the energy required for synchronizing moving sensor nodes in a Wireless Sensor Network (WSN) affected by large-scale fading, based on clock estimation techniques. The energy required for synchronizing a WSN within a desired estimation error level is specified by both the transmit power and the required number of messages. In this paper we extend our previous work introducing nodes? movement and the average message delay in the total energy, including a comprehensive analysis on how the distance between nodes impacts on the energy and synchronization quality trade- off under large-scale fading effects.Fil: Briff, Pablo. Universidad de Buenos Aires. Facultad de Ingeniería; ArgentinaFil: Rey Vega, Leonardo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ingeniería; ArgentinaFil: Lutenberg, Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ingeniería; ArgentinaFil: Vargas, Fabian. Pontificia Universidade Católica do Rio Grande do Sul; Brasi
Automatic generation of VHDL code for a railway interlocking system
No full textThis article introduces a novel technique to automatically analyse a railway network geographical representation and produce a suitable FPGA railway interlocking system by generating its VHDL hardware description. This approach accelerates the design, implementation and testing phases on different topologies. We review the automated tools developed - which are part of a comprehensive workflow - and present the results for topologies of varying complexities.Fil: Menéndez, Martín Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ingeniería; ArgentinaFil: Germino, Santiago. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ingeniería; ArgentinaFil: Larosa, Facundo S.. Universidad Tecnológica Nacional; ArgentinaFil: Lutenberg, Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ingeniería; Argentin
Shunt-dependent hydrocephalus after aneurysmal subarachnoid hemorrhage. A systematic review and meta-analysis
No full textShunt-dependent hydrocephalus (SDHC) after aneurysmal subarachnoid hemorrhage (aSAH) is the occurrence of symptomatic ventriculomegaly requiring permanent shunt diversion. Although several studies investigated the predictors of SDHC, the role of many of these factors, as well as the prevalence of SDHC and patients' clinical outcome, remain a matter of controversy
Supervision system for emergency brake and traction-system isolation on train formations
No full textIn the event of an emergency, railway safety systems typically work by isolating the traction-system and applying the emergency brake, causing logistic problems on the railway line where the train formation remains stopped. This paper presents the design of a supervision system that enables the train formation to be moved in a limited and controlled way to a repair workshop or to a safe place for dropping off passengers (in the case of passenger trains). This supervision system is considered critical, because it operates on the emergency brake and the traction-system. Thus, recommendations of the UNE-EN 50126 standard were followed during its design. In particular, hardware design techniques commonly used in other industries like automotive, aeronautics and aerospace, have been adopted.Fil: Di Vito, Iván Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Electronica; ArgentinaFil: Gomez, Pablo Martín. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Electronica; ArgentinaFil: Lutenberg, Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Electronica; Argentin
On energy-efficient time synchronization for wireless sensors under large-scale and small-scale fading effects
Get PDFIn this work, the existing trade-off between time synchronization quality and energy is studied for both large-scale and small-scale fading wireless channels. We analyze the clock offset estimation problem using one-way, two-way and N-way message exchange mechanisms affected by Gaussian and exponentially distributed impairments. Our main contribution is a general relationship between the total energy required for synchronizing a wireless sensor network and the clock offset estimation error by means of the transmit power, number of transmitted messages and average message delay, deriving the energy optimal lower bound as a function of the time synchronization quality and the number of hops in a multi-hop network.Fil: Briff, Pablo. Universidad de Buenos Aires. Facultad de Ingeniería; ArgentinaFil: Lutenberg, Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Centro de Simulación Computacional para Aplicaciones Tecnológicas; Argentina. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Electronica; ArgentinaFil: Rey Vega, Leonardo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Centro de Simulación Computacional para Aplicaciones Tecnológicas; Argentina. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Electronica; ArgentinaFil: Fabian Vargas. Pontificia Universidade Católica do Rio Grande do Sul; Brasi
FPGA implementation of a critical railway interlocking system
No full textAn interlocking is a railway system that automatically controls that changes in routes are safely managed, avoidingtrain crashes and derailments. This article presents an analysis of the state of the art technology used in several commercial interlocking equipment. Based on this analysis, design and implementation of an interlocking system architecture in FPGA technology is proposed. Appropriate techniques are applied to achieve the required level of security. The scalability of the design is also analyzed and conclusions are presented.Fil: Menéndez, Martín Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Electronica; ArgentinaFil: Larosa, Facundo Santiago. Universidad Tecnológica Nacional. Facultad Regional Haedo; ArgentinaFil: Ghignone, Ramiro Adrian. Universidad Tecnológica Nacional. Facultad Regional Haedo; ArgentinaFil: Alvarez, Nicolás. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Electronica; Argentina. Universidad Nacional de San Martín; ArgentinaFil: Lutenberg, Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Electronica; Argentin
Pattern matching oriented photodetector image sensor with programmable interconnection between pixels
No full textWe present a photodetector sensor that is able to perform preprocessing operations on the focal plane. Each pixel can be connected with any of its neighbors in order to implement detection zones defined by software. The output current of the sensor is a customizable weighted sum of the currents sourced at the defined detection zones. This characteristic leads to applications related to pattern matching. Two examples are shown in our work: one is related to speckle correlation for real-time vibration detection, and the other one is an alternative image recording method that is the first step to an on-hardware compressed sensing technique.Fil: Calarco, Nicolás Ezequiel. Universidad Nacional del Comahue. Facultad de Ingeniería; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Confluencia. Instituto de Investigación En Tecnologías y Ciencias de la Ingeniería. Universidad Nacional del Comahue. Instituto de Investigación En Tecnologías y Ciencias de la Ingeniería; ArgentinaFil: Lipovetzky, José. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; ArgentinaFil: Lutenberg, Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ingeniería; ArgentinaFil: Perez Quintian, Luis Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Confluencia. Instituto de Investigación En Tecnologías y Ciencias de la Ingeniería. Universidad Nacional del Comahue. Instituto de Investigación En Tecnologías y Ciencias de la Ingeniería; Argentina. Universidad Nacional del Comahue. Facultad de Ingeniería; Argentin
Design of a portable system for continuous recording of arterial parameters during 24h
Get PDFThe simultaneous measurement of pressure and diameter in a central artery during 24 hours could bring new information about the variability of the arterial mechanical properties. In order to perform these measurements in an animal, it is essential to count with a device that could acquire the signals from the sensors with a proper preconditioning circuit and then transfer them wirelessly to be stored and processed remotely. In this paper we present the prototype of a new portable and autonomous device, capable of being hosted on the animal's back. Preliminary results obtained from a pilot experience in a sheep using the prototype are detailed and limitations are discussed.Fil: Bortolin, Lucas. Universidad Favaloro; ArgentinaFil: Craiem, Damian. Universidad Favaloro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Gorgolino, Jorge. Universidad de Buenos Aires; ArgentinaFil: Santoriello, Gerardo Luis. Universidad de Buenos Aires; ArgentinaFil: Lutenberg, Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; ArgentinaFil: Graf Caride, Diego Sebastián. Universidad Favaloro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
A test platform for dependability analysis of SoCs Exposed to EMI and radiation
Get PDFWith the IEC 62.132 proposal, the roadmap for standardization of Electromagnetic (EM) immunity measurement methods has reached a high degree of success. The same understanding can be taken from the MIL-STD-883 H for Total Ionizing Dose (TID) radiation. However, no effort has been made to measure the behavior of electronics operating under the combined effects of both, EM noise and TID radiation. For the reasons pointed out, the combined-effect measurements should be mandatory when dealing with Systems-on-Chip (SoCs) devoted to critical applications. In this paper, we present a configurable platform devoted to perform combined tests of EM immunity and TID radiation of SoCs according to the international standards.Fil: Benfica, Juliano. Pontificia Universidade Católica do Rio Grande do Sul; BrasilFil: Bolzani Poehls, Letícia Maria. Pontificia Universidade Católica do Rio Grande do Sul; BrasilFil: Vargas, Fabian. Pontificia Universidade Católica do Rio Grande do Sul; BrasilFil: Lipovetzky, José. Universidad de Buenos Aires. Facultad de Ingeniería; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Lutenberg, Ariel. Universidad de Buenos Aires. Facultad de Ingeniería; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Gatti, Edmundo. Instituto Nacional de Tecnología Industrial. Centro de Electrónica e Informática; ArgentinaFil: Hernandez, Fernando. Universidad ORT Uruguay; Urugua
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