In feature selection, the most important features must be chosen so as to decrease the number thereof while retaining their discriminatory information. Within this context, a novel feature selection method based on an ensemble of wrappers is proposed and applied for automatically select features in fish age classification. The effectiveness of this procedure using an Atlantic cod database has been tested for different powerful statistical learning classifiers. The subsets based on few features selected, e.g. otolith weight and fish weight, are particularly noticeable given current biological findings and practices in fishery research and the classification results obtained with them outperforms those of previous studies in which a manual feature selection was performed.
This paper describes how a particular form of iterative design-implement experiences were driven in the fourth-year Advanced Project in Science and Telecommunications Technology of the Degree in Sciences and Telecommunication Technologies taught at the Escola Tècnica Superior d'Enginyeria de Telecomunicació de Barcelona (Telecom BCN), in which students were faced with the incremental development of an innovative mirroring tool for facial paralysis rehabilitation. This work was done in the research framework established by Telecom BCN, Bellvitge University Hospital and Bellvitge Biomedical Research Institute
Sistema de estabilización para la compensación angular en plataformas LIDAR móviles que comprende, al menos, un LIDAR y un sistema óptico deflector que se caracteriza porque dicho sistema deflector comprende, al menos, un deflector móvil en sus ejes de piten y roll; y donde dicho deflector está configurado para mantener el apuntamiento del LIDAR en una dirección dada mediante un mecanismo de compensación angular controlado electrónicamente.
The response of ion-sensitive field-effect transistors (ISFETs) can be seriously affected in mixed-ion solutions by different interfering ions. As has been demonstrated, this problem can be addressed using nonlinear semi-blind source separation (BSS) algorithms based on post non-linear mixtures in which nonlinear transforms must be computed using supervised samples, i.e. calibration points for known concentrations of the main ion. In order to eliminate the cost of collecting such
samples, this paper introduces a novel non-linear BSS algorithm that employs linearizing transforms computed only with unsupervised information. The scale indeterminacy of this transform is removed using a prior on the sources based on
magnitude bounding and, besides, gaussianization is generalized by using a kernel estimator. Experiments with real ISFET measurements demonstrate that this BSS algorithm achieves a level of accuracy similar to that of the semi-blind counterpart based on independent component analysis and outperforms a post-nonlinear BSS algorithm which minimizes the mutual information.
In this paper, the discriminative capability of a combination of biological and shape features for fish age classification are analyzed. In particular, the usefulness of otolith weight in several species, in combination with other features such as otolith shape features and biological features such fish length, weight and sex is evaluated. The classification performance for different state-of-the-art statistical learning classifiers (i.e. several non-linear, non-parametric classifiers such different types of multi-class support vector machines) using an Atlantic cod database has been tested in which otolith weight has shown to be a powerful characteristic for classification purposes but the greatest accuracy is achieved when it is used simultaneously with other features.
Sistema de estabilización para la compensación angular en plataformas LIDAR móviles que comprende, al menos, un LIDAR y un sistema óptico deflector que se caracteriza porque dicho sistema deflector comprende, al menos, un deflector móvil en sus ejes de pitch y roll; y donde dicho deflector está configurado para mantener el apuntamiento del LIDAR en una dirección dada mediante un mecanismo de compensación angular controlado electrónicamente.