ROBESAFE - Artículos
http://hdl.handle.net/10017/42853
ROBESAFE - Artículos2024-03-29T06:52:13ZPráctica de laboratorio de captura de energía de radio frecuencia
http://hdl.handle.net/10017/49180
Práctica de laboratorio de captura de energía de radio frecuencia
Boquete Vázquez, Luciano; Barea Navarro, Rafael; Rodríguez Ascariz, José Manuel; Cantos Frontela, José Joaquín; Miguel Jiménez, Juan Manuel
La obtención de energía por medios alternativos,
amigables con el medio ambiente, y que no dependan de baterías
contaminantes a las que haya que recargar y asegurar un
mantenimiento periódico, se plantea como una opción interesante
en la alimentación de sistemas electrónicos autónomos de bajo
consumo. En este trabajo se presenta una práctica de laboratorio
que permite obtener energía eléctrica a partir de una señal de
radio frecuencia (RF). El alumno aprende a diseñar y a
caracterizar una antena de parche básica, comprende el proceso
de sintonización de señales de RF y comprueba el funcionamiento
del sistema. También se plantean posibles ampliaciones y
modificaciones que ayudan al alumno a enriquecer su
conocimiento sobre potenciales aplicaciones de los sistemas de
captura de energía de RF. Se incluye finalmente la opinión de los
alumnos que han realizado esta práctica en el laboratorio
durante tres cursos académicos.
X Congreso de Tecnologías Aplicadas a la Enseñanza de la Electrónica, Vigo, 13-15 de junio de 2012.
2012-01-01T00:00:00ZContinuous‑wavelet‑transform analysis of the multifocal ERG waveform in glaucoma diagnosis
http://hdl.handle.net/10017/49179
Continuous‑wavelet‑transform analysis of the multifocal ERG waveform in glaucoma diagnosis
Miguel Jiménez, Juan Manuel; Blanco, R.; Santiago Rodrigo, Luis de; Fernández Rodríguez, Alfredo José; Rodríguez Ascariz, José Manuel; Barea Navarro, Rafael; Martín Sánchez, José Luis; Amo, C.; Sánchez Morla, Eva María; Boquete Vázquez, Luciano
The vast majority of multifocal electroretinogram (mfERG) signal analyses to detect glaucoma study the signals’ amplitudes and latencies. The purpose of this paper is to investigate application of wavelet analysis of mfERG signals in diagnosis of glaucoma. This analysis method applies the continuous wavelet transform (CWT) to the signals, using the real Morlet wavelet. CWT coefficients resulting from the scale of maximum correlation are used as inputs to a neural network, which acts as a classifier. mfERG recordings are taken from the eyes of 47 subjects diagnosed with chronic open-angle glaucoma and from those of 24 healthy subjects. The high sensitivity in the classification (0.894) provides reliable detection of glaucomatous sectors, while the specificity achieved (0.844) reflects accurate detection of healthy sectors. The results obtained in this paper improve on the previous findings reported by the authors using the same visual stimuli and database.
2015-04-08T00:00:00ZImproved measurement of intersession latency in mfVEPs
http://hdl.handle.net/10017/49178
Improved measurement of intersession latency in mfVEPs
Santiago Rodrigo, Luis de; Fernández Rodríguez, Alfredo José; Blanco, R.; Pérez Rico, María Consuelo; Rodríguez Ascariz, José Manuel; Barea Navarro, Rafael; Miguel Jiménez, Juan Manuel; Amo, C.; Sánchez Morla, Eva María; Boquete Vázquez, Luciano
Purpose: The purpose of the study is to present a method (Selfcorr) by which to measure intersession latency differences between multifocal VEP (mfVEP) signals.
Methods: The authors compared the intersession latency difference obtained using a correlation method (Selfcorr) against that obtained using a Template method. While the Template method cross-correlates the subject’s signals with a reference database, the Selfcorr method cross-correlates traces across subsequent recordings taken from the same subject.
Results: The variation in latency between intersession signals was 0.8 ± 13.6 and 0.5 ± 5.0 ms for the Template and Selfcorr methods, respectively, with a coefficient of variability C V_TEMPLATE = 15.83 and C V_SELFCORR = 5.68 (n = 18, p = 0.0002, Wilcoxon). The number of analyzable sectors with the Template and Selfcorr methods was 36.7 ± 8.5 and 45.3 ± 8.7, respectively (p = 0.0001, paired t test, two tailed).
Conclusions: The Selfcorr method produces smaller intersession mfVEP delays and variability over time than the Template method.
2014-05-07T00:00:00ZDevelopment and validation of an HIV risk exposure and indicator conditions questionnaire to support targeted HIV screening
http://hdl.handle.net/10017/49168
Development and validation of an HIV risk exposure and indicator conditions questionnaire to support targeted HIV screening
Pérez Elías, María Jesús; Gómez Ayerbe, Cristina; Pérez Elías, Pilar; Muriel, Alfonso; Diaz de Santiago, Alberto; Martinez Colubi, María; Moreno, Ana; Santos, Cristina; Polo, Lidia; Barea Navarro, Rafael; Robledillo, Gema; Uranga, Almudena; Cano Espín, Agustina; Quereda, Carmen; Dronda, Fernando; Casado, Jose Luis; Moreno, Santiago
The aim of our study was to develop a Spanish-structured HIV risk of exposure and indicator conditions (RE&IC) questionnaire. People attending to an emergency room or to a primary clinical care center were offered to participate in a prospective, 1 arm, open label study, in which all enrolled patients filled out our developed questionnaire and were HIV tested. Questionnaire accuracy, feasibility, and reliability were evaluated.
Valid paired 5329 HIV RE&IC questionnaire and rapid HIV tests were performed, 69.3% in the primary clinical care center, 49.6% women, median age 37 years old, 74.9% Spaniards, 20.1% Latin-Americans. Confirmed hidden HIV infection was detected in 4.1%, while HIV RE&IC questionnaire was positive in 51.2%. HIV RE&IC questionnaire sensitivity was 100% to predict HIV infection, with a 100% negative predictive value. When considered separately, RE or IC items sensitivity decreases to 86.4% or 91%, and similarly their negative predictive value to 99.9% for both of them. The majority of people studied, 90.8% self-completed HIV RE&IC questionnaire. Median time to complete was 3 minutes. Overall HIV RE&IC questionnaire test-retest Kappa agreement was 0.82 (almost perfect), likewise for IC items 0.89, while for RE items was lower 0.78 (substantial).
A feasible and reliable Spanish HIV RE&IC self questionnaire accurately discriminated all non–HIV-infected people without missing any HIV diagnoses, in a low prevalence HIV infection area. The best accuracy and reliability were obtained when combining HIV RE&IC items.
2016-02-01T00:00:00Z