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26 results on '"Fontan, Luis"'

8. Comparing brain injury rehabilitation practices: what can North and South Americans learn from each other? (Comparing Brain Injury Rehabilitation Practices)

Author

Upton, Thomas D., Fontan, Luis, Premuda, Paola, Lorenzo, Jorge, and Quinteros, Nila

Subjects
National Head Injury Foundation -- Research, Brain -- Injuries
Abstract

Brain injury is an epidemic that professionals worldwide are addressing. Brain injury professionals from North and South America (United States and Uruguay) discussed how each country is systematically serving persons with brain injury. More specifically, this article highlights common brain injury common deficits, reviews existent brain injury rehabilitation protocols in the United States and Uruguay, and culminates by proposing what brain injury professionals from North and South America may learn from each other to better serve persons with brain injuries., Professionals from the United States and Uruguay are mutually concerned about brain injury residuals. Estimates of acquired brain injuries emphasize the need for the development and provision of comprehensive services [...]

Published
2002

9. Master–slave DC droop control for paralleling auxiliary DC/DC converters in electric bus applications

Author

Ibanez Federico, Fontan Luis, and Echeverria Jose

Subjects
050210 logistics & transportation, Computer science, 020208 electrical & electronic engineering, 05 social sciences, Control (management), Master/slave, 02 engineering and technology, Converters, Energy storage, Power (physics), 0502 economics and business, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Voltage droop, Microgrid, Electrical and Electronic Engineering, Lead–acid battery
Abstract

This study reviews the causes of power losses in a DC/DC converter, relates those losses with efficiency profiles, and details different strategies for maximising efficiency when several converters are placed in parallel. The research is focused on electric bus applications, where several converters are usually connected in parallel in order to fulfil the power requirements of the bus models. In a bus, the low-voltage DC link (28 V) resembles a microgrid that has some generators (DC/DC converters), an energy storage system (lead-acid batteries) and certain loads. To share the converters' output power, a droop control is proposed. Furthermore, traditional droop control is improved by adding a master-slave control. The proposed master-slave droop control improves efficiency by more than 3% at low power with no additional hardware. Experimental results show how two 5 kW converters work in parallel using the proposed control.

Published
2017

10. Two coarse frequency acquisition algorithms for OFDM based IEEE 802.11 standards

Author

Arrue, Naiara, Velez, Igone, Sevillano, Juan F., and Fontan, Luis

Subjects
Wireless local area networks (Computer networks) -- Analysis, Wireless LAN/WAN system, Wireless network, Business, Electronics and electrical industries, Engineering and manufacturing industries
Abstract

A novel coarse carrier frequency estimation approach is proposed for the IEEE 802.11 OFDM,family. This approach employs the properties of the preamble to reduce the carrier acquisition problem to single tone frequency estimation. Two low cost algorithms are proposed. Their main features and implementation details are analyzed. The first algorithm presents good performance in moderate and high SNR multipath environments. The second algorithm is' very robust in low SNR multipath scenarios. Extensive simulation results are presented. Index Terms--Orthogonal frequency division multiplexing (OFDM), synchronization, carrier frequency acquisition, Wireless Local Area Network (WLAN).

Published
2007

16. Simul'Elec, a Delphi written simulator for power Electrical Engineering, using VHDL-AMS modeling

Author

Legrand, Fabien, Azurmendi, Maria, Martin, Fernando, Fontan, Luis, Charlot, Jean-Jacques, Couture, Nadine, CEIT, Universidad del Pais Vasco / Euskal Herriko Unibertsitatea [Espagne] (UPV/EHU), ESTIA Recherche, Ecole Supérieure des Technologies Industrielles Avancées (ESTIA), and Couture, Nadine

Subjects
[SPI.NRJ]Engineering Sciences [physics]/Electric power, [INFO.INFO-MO] Computer Science [cs]/Modeling and Simulation, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, [SPI.NRJ] Engineering Sciences [physics]/Electric power
Abstract

International audience; Few simulators are designed for power electrical engineering and they should be usually used by high skilled users. Simul'Elec is an electrical simulator, part of an electrical CAD software. This simulator is designed with the focus of giving access to simulation to electrical CAD users usually not very familiar with simulation tools. It provides a graphical modeling interface. This friendly simulator written in Delphi integrates graphical user interface to generate VHDL-AMS models and a compiler to simulate its.

Published
2007

24. A Step-Up Bidirectional Series Resonant DC/DC Converter Using a Continuous Current Mode.

Author

Martin Ibanez, Federico, Martin Echeverria, Jose, Vadillo, Javier, and Fontan, Luis

Subjects
DIRECT currents, ELECTRIC current converters, SUPERCAPACITORS, ENERGY transfer, ELECTRIC batteries
Abstract

This paper presents the analysis and design of a novel technique that allows the conventional series resonant dc/dc converter (SRC) to work as a step-up and step-down converter. This is useful in bidirectional dc/dc converters where one port is attached to a fixed voltage dc line, e.g., a 360-V dc line, and the other port is attached to an energy storage device such as a bank of supercapacitors or batteries. Every converter that works in this scenario requires step-up and step-down modes to transfer energy from one port to the other. The paper presents the SRC as an alternative to the well-known dual active bridge (DAB). The dc analysis is detailed to demonstrate the step-up capability. In addition, the ac analysis is presented. Experimental results from a 6-kW prototype validate the theoretical analysis. The results indicate that this technique achieves better efficiency compared to the phase-shift DAB in a wide power range, from heavy to light loads. The main reason for this is that the converter works with smaller currents than the DAB at light loads. [ABSTRACT FROM AUTHOR]

Published
2015
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25. Frequency response analysis for bidirectional seriesresonant DC/DC converter in discontinuous mode.

Author

Ibanez, Federico, Echeverrí, Jose Martín, Vadillo, Javier, and Fontan, Luis

Subjects
FREQUENCY response, DC-to-DC converters, DISCONTINUOUS functions, FOURIER analysis, ELECTRIC potential
Abstract

This study analyses the frequency response of a bidirectional series-resonant DC/DC converter (SRC) working in a discontinuous mode (DCM). The converter can reach a voltage conversion ratio higher or lower than one, depending on whether the operation mode is step-up or step-down. The analysis is based on a novel mixed technique using both the statespace average method and the Fourier method to obtain a state-space averaged model of the converter. The study presents the model for the two operation modes. It also presents the frequency response of the output voltage as a function of the input voltage and as a function of the off-time, which is the control parameter of the converter. The results of those transfer functions are compared with measurements in a 2000 W prototype. The model provides enough information to properly control the SRC in DCM. [ABSTRACT FROM AUTHOR]

Published
2014
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