C. J. Zapata - Rodríguez

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The use of driving-aid ultrasonic systems in low visibility conditions due to fog, makes it necessary to study the influence of environmental parameters such as temperature, humidity or air velocity on the ultrasonic propagation. The present work tries to construct simple empirical models for velocity and echo amplitude that includes temperature and(More)
In this work, an original controller for an emergency braking system for urban traffic based on ultrasonic sensors is presented, which is optimized by means of a Genetic Algorithm. The main advantage over similar controllers available in the market today, is that in order to maintain a safe distance to the preceding vehicle, it is not necessary to know the(More)
We have analyzed surface-wave propagation that takes place at the boundary between an isotropic medium and a semi-infinite metal-dielectric periodic medium cut normally to the layers. In the range of frequencies where the periodic medium shows hyperbolic space dispersion, hybridization of surface waves (dyakonons) occurs. At low to moderate frequencies,(More)
In this paper, we demonstrate analytically that Basu model estimates are affected by two biases, except if very restrictive conditions are met: an aggregation bias produced by the absence of the book-to-market ratio in Basu model, and (2) an aggregation problem produced by the use of total market returns instead of separating the good news and bad news of(More)
We present the results obtained in a defect detection system for foundry pieces, with an industrial application using ultrasonic transducers. Several processing techniques of the echoes coming from the pieces are analysed in order to find the most efficient one. To make the system more reliable, furthermore, we have studied the influence of the conditions(More)
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