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Extraction of the underlying structure of systematic risk from non-Gaussian multivariate financial time series using independent component analysis: Evidence from the Mexican stock exchange
(2018-01-01)
Article
Open AccessRegarding the problems related to multivariate non-Gaussianity of financial time series, i.e., unreliable results in extraction of underlying risk factors -via Principal Component Analysis or Factor Analysis-, we use ... -
Electron density retrieval from truncated Radio Occultation GNSS data
(2019-06-01)
Article
Open AccessThis paper summarizes the definition and validation of two complementary new strategies, to invert incomplete Global Navigation Satellite System Radio-Occultation (RO) ionospheric measurements, such as the ones to be ... -
Chatbol, a chatbot for the Spanish “La Liga”
(Springer, 2019-09-25)
Article
Restricted access - publisher's policyThis work describes the development of a social chatbot for the football domain. The chatbot, named chatbol, aims at answering a wide variety of questions related to the Spanish football league “La Liga”. Chatbol is deployed ... -
Dades, màquina i ètica
(2019-02-01)
Article
Open Access -
ADDTID: An alternative tool for studying earthquake/tsunami signatures in the ionosphere. Case of the 2011 Tohoku earthquake
(Multidisciplinary Digital Publishing Institute (MDPI), 2019-09-13)
Article
Open AccessTraveling Ionospheric Disturbances (ADDTID) algorithm. This algorithm automatically detects and characterizes Traveling Ionospheric Disturbances (TIDs) from Global Navigation Satellite System (GNSS) measurements. Applying ... -
Neural networks principal component analysis for estimating the generative multifactor model of returns under a statistical approach to the arbitrage pricing theory: Evidence from the mexican stock exchange
(2019-01-01)
Article
Open AccessA nonlinear principal component analysis (NLPCA) represents an extension of the standard principal component analysis (PCA) that overcomes the limitation of the PCA’s assumption about the linearity of the model. The NLPCA ... -
Chinese-Catalan: A neural machine translation approach based on pivoting and attention mechanisms
(2019-01-01)
Article
Open AccessThis article innovatively addresses machine translation from Chinese to Catalan using neural pivot strategies trained without any direct parallel data. The Catalan language is very similar to Spanish from a linguistic point ... -
Unemployment expectations: A socio-demographic analysis of the effect of news
(2019-10-01)
Article
Restricted access - publisher's policyIn this study, we evaluate the effect of news on consumer unemployment expectations for sixteen socio-demographic groups. To this end, we construct an unemployment sentiment indicator and extract news about several economic ... -
Incorporation of acoustic sensors in the regulation of a mobile robot
(2019-01-17)
Article
Open AccessThis article introduces the incorporation of acoustic sensors for the localization of a mobile robot. The robot is considered as a sound source and its position is located applying a Time Delay of Arrival (TDOA) method. ... -
Knowledge sharing in the health scenario
(2014-11-28)
Article
Open AccessThe understanding of certain data often requires the collection of similar data from different places to be analysed and interpreted. Interoperability standards and ontologies, are facilitating data interchange around the ... -
The use of long-term features for GMM- and i-vector-based speaker diarization systems
(2018-09-26)
Article
Open AccessSeveral factors contribute to the performance of speaker diarization systems. For instance, the appropriate selection of speech features is one of the key aspects that affect speaker diarization systems. The other factors ... -
Detection and description of the different ionospheric disturbances that appeared during the solar eclipse of 21 August 2017
(Multidisciplinary Digital Publishing Institute (MDPI), 2018-10-30)
Article
Open AccessThis work will provide a detailed characterization of the travelling ionospheric disturbances (TIDs) created by the solar eclipse of 21 August 2017, the shadow of which crossed the United States from the Pacific to the ...
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