Perceived value of advanced mobile messaging services: A cross-cultural comparison of Greek and Spanish users

Purpose The purpose of this paper is to analyse the role of perceived value on post-acceptance behaviour for users of advanced mobile messaging services (AMMS). The paper also compares differences in the influence of perceived value on satisfaction and of satisfaction on loyalty to AMMS in Spain and Greece, to test the moderating effect of culture. Design/methodology/approach Partial least squares path modelling is used to test the model. Perceived value is modelled as a multidimensional reflective construct with four dimensions. Culture is studied at a national level. Differences between countries are tested using the multigroup analysis approach proposed by Henseler et al. (2009). Findings Perceived value contributes significantly to satisfaction. Satisfaction also has a significant effect on loyalty. Regarding the moderating effect of culture, the influence of perceived value on satisfaction is higher in Greece than in Spain. The authors report similar findings for the effect of satisfaction on loyalty, demonstrating the relevant moderating role of cultures with different degrees of masculinity, uncertainty avoidance and collectivism. Practical implications This cross-cultural comparison enables mobile phone companies to understand how to provide the greatest value with AMMS in each country in order to increase user satisfaction and loyalty to the service. Originality/value This is one of the first studies that develops cross-cultural research to analyse the post-acceptance of mobile services. It analyses the effect of perceived value and satisfaction, making an original comparison of two countries generally considered too similar to be compared

Goal-setting and players' perception of their effectiveness in mini-basketball

The purpose of the study was to assess the effect of an intervention program of goal setting using written report as feedback and controlling players' perception during the competitive season of a mini-basketball team. The intervention program was implemented on under-12 male mini-basketball team. The independent variable was the application of the intervention program of the goal-setting. The dependent variables were players' perception, and level of achievement of the goals. Three-four goals were design for each player. After each match, the players indicated in a scale from 0 to 10 their perception about the level of achievement of the goals. First day of practice of the week, the achievement of the goals and their perception was shown to the players. The results found show that: a) a reduction between the differences of the players' perception and the goal achievement through the season, and b) a significant increase through the season of the achievement of the goals was found. The study may be a reference to help coaches to implement goal-setting in youth teams

Network Theoretical Approach to Describe Epileptic Processes

Epilepsy is characterized by recurrent unprovoked seizures. Recent studies suggest that seizure generation may be caused by the abnormal activity of the entire network. This new paradigm requires new tools and methods for its study. In this sense, synchronization by linear as well as nonlinear measures are used to determine network structure and functional connectivity of neurophysiological data. Electroencephalography (EEG) data can be analyzed using each electrode’s activity as a node of the underlying cortical network. The information provided by the synchronization matrix is the basic brick upon which several lines of analysis can be performed thereafter. Detection of community structures, identification of centrality nodes, transformation of the underlying network into a simpler one, and the identification of the basic network architecture are only some of the many lines of basic works that can be done in order to characterize the epilepsy as a network disease. This chapter describes new approaches in network epilepsy, provides mathematical concepts in order to understand the complex network analyses, and reviews the advances in network analyses and its application to epilepsy research

Fluorescence of the Flavin group in choline oxidase. Insights and analytical applications for the determination of choline and betaine aldehyde

Choline oxidase (ChOx) is a flavoenzyme catalysing the oxidation of choline (Ch) to betaine aldehyde (BA) and glycine betaine (GB). In this paper a fundamental study of the intrinsic fluorescence properties of ChOx due to Flavin Adenine Dinucleotide (FAD) is presented and some analytical applications are studied in detail. Firstly, an unusual alteration in the excitation spectra, in comparison with the absorption spectra, has been observed as a function of the pH. This is ascribed to a change of polarity in the excited state. Secondly, the evolution of the fluorescence spectra during the reaction seems to indicate that the reaction takes place in two consecutive, but partially overlapped, steps and each of them follows a different mechanism. Thirdly, the chemical system can be used to determine the Ch concentration in the range from 5×10-6 M to 5×10-5 M (univariate and multivariate calibration) in the presence of BA as interference, and the joint Ch+BA concentration in the range 5×10-6-5×10-4 M (multivariate calibration) with mean errors under 10%//a semiquantitative determination of the BA concentration can be deduced by difference. Finally, Ch has been successfully determined in an infant milk sample

Vertebrate fauna at the Allosaurus fossil-site of Andrés (Upper Jurassic), Pombal, Portugal

An overview of the faunistic diversity of the Andres fossil-site from the Portuguese Upper Jurassic is presented. This work provides a preliminary approach on the vertebrate fauna known at present. Although this quarry is known since the 1990’s, due to the description on the first robust evidence of a member of the neotetanuran genus Allosaurus outside North America, the results presented here are mainly derived from the analysis of the elements found during the second and third field seasons in 2005. At the moment, among the material collected from Andrés it was identified remains that represent a diverse vertebrate fauna, including fishes, sphenodonts, crocodrylomorphs, pterosaurs, and at least, seven distinct dinosaur forms. The recovery of this diverse and abundant osteological collection from one unique fossil-site is noteworthy for the Upper Jurassic Portuguese record, and only comparable with those from the Guimarota coalmine. Due to these two features plus the good preservation of the fossils, the Andres quarry may be a site of reference for the analysis of vertebrate ecosystems from the Portuguese Upper Jurassic. Dinosaur elements are the most abundant fossils, and among them it is particulary common the presence of remains identified as Allosaurus. These new evidences allow testing the previus phylogenetical hypothesys ascribing the firsts theropod remains from Andrés to A. fragilis, a species described in synchronic levels of the North American Morrison Formation. The similarity between the Allosaurus remains collected in Andres and some specimens from the Morrison Formation seems to point the existence of a genetic flow between some continental vertebrates on both sides of the proto-north Atlantic during the Upper Jurassic. Favourable tectonic conditions for the occurrence of punctual contacts between the two continents is, at present, the best scenario for explain this situation.Se presenta un analisis de la diversidad faunistica del yacimiento de Andrés en el Jurasico Superior de la Cuenca Lusitanica. El presente trabajo pretende establecer un análisis preliminar de la fauna de vertebrados identificada en el yacimiento hasta la fecha. Aunque conocido desde la decada de 1990, debido a la descripcion de la primera evidencia robusta de un neotetanuro del genero Allosaurus fuera de Norteamerica, los resultados presentados derivan principalmente del analisis de elementos encontrados durante la segunda y tercera campanas de excavacion en 2005. Hasta el momento han sido identificados entre el material recogido en Andrés, representantes de diversos taxones de vertebrados que incluyen que incluyen peces, esfenodontos, crocodilomorfos, pterosaurios y, al menos, siete formas distintas de dinosaurios. La presencia de esta diversidad y abundancia de restos osteologicos en el mismo yacimiento representa una situacion unica en el registro del Jurasico Superior portugues, tan solo comparable a la del yacimiento clasico de la mina de carbon de Guimarota. Atendiendo a estas dos caracteristicas y a la buena preservacion de los fosiles, el yacimiento de Andres puede ser considerado como una localidad de referencia para el estudio de los ecosistemas con vertebrados del Jurasico Superior portugues. Los restos de dinosaurios son los fosiles mas abundantes y, entre ellos, son particularmente comunes los asignables a Allosaurus. Estas nuevas evidencias proporcionan a A. fragilis, una especie descrita en niveles sincronicos de la Formacion Morrison en Norteamerica. La similitud entre los restos de Allosaurus recogidos en Andres y algunos de los ejemplares de la Formacion Morrison, sugiere la existencia de un flujo genético entre algunos vertebrados continentales de ambos lados del proto-Atlántico norte durante el Jurásico Superior. La existencia de condiciones tectonicas favorables para la existencia de contactos puntuales entre los dos continentes es actualmente el mejor escenario para explicar esta situacion

Orofacial dermoid cysts in pediatric patients : a review of 8 cases

Objective: The aim was to analyze the clinical characteristics, treatment and outcome of 8 orofacial dermoid cysts (DC) in pediatric patients. Material and Methods: A retrospective observational study was made, reviewing the medical records with clinical diagnosis of dermoid cyst between 1987 and 2006 in the Children?s Maxillofacial Surgery Department of the Hospital Universitario La Fe, Valencia, Spain. The following data were collected: sex, age, location, size and duration of the lesion, treatment, length of follow-up, and recurrence. Results: Eight patients (3 girls and 5 boys) with a mean age of 2.7 years (range 0-12 years). Four DC were located in the oral area (3 sublingual and 1 lingual), one in the periorbital and three in the nasal areas. The size ranged from 0.8 cm to 4 cm. The mean duration of the lesion was 13.7 months (range 4 days to 2 years). All DC were diagnosed pathologically following surgical removal of the lesion. There were no recurrences. Conclusion: The appearance of DC in the maxillofacial region of pediatric patients is uncommon. The floor of the mouth is the most frequently affected area in the oral cavity. Treatment is surgical removal of the lesion. Recurrence is unusual

Analyzing artificial intelligence systems for the prediction of atrial fibrillation from sinus-rhythm ECGs including demographics and feature visualization

Atrial fibrillation (AF) is an abnormal heart rhythm, asymptomatic in many cases, that causes several health problems and mortality in population. This retrospective study evaluates the ability of different AI-based models to predict future episodes of AF from electrocardiograms (ECGs) recorded during normal sinus rhythm. Patients are divided into two classes according to AF occurrence or sinus rhythm permanence along their several ECGs registry. In the constrained scenario of balancing the age distributions between classes, our best AI model predicts future episodes of AF with area under the curve (AUC) 0.79 (0.72–0.86). Multiple scenarios and age-sex-specific groups of patients are considered, achieving best performance of prediction for males older than 70 years. These results point out the importance of considering different demographic groups in the analysis of AF prediction, showing considerable performance gaps among them. In addition to the demographic analysis, we apply feature visualization techniques to identify the most important portions of the ECG signals in the task of AF prediction, improving this way the interpretability and understanding of the AI models. These results and the simplicity of recording ECGs during check-ups add feasibility to clinical applications of AI-based modelsGJO, AS-G, LJJ-B received a research grant from the Carlos III Institute of Health under the health Strategy action 2020-2022 with reference PI20/00792. Tis study is also supported partially by projects TRESPASS-ETN (H2020-MSCAITN-2019-860813), PRIMA (H2020-MSCA-ITN-2019-860315), IDEA-FAST (IMI2-2018-15-853981), BIBECA (RTI2018-101248-B-I00 MINECO/FEDER

Prediction of atrial fibrillation from sinus-rhythm electrocardiograms based on deep neural networks: Analysis of time intervals and longitudinal study

Objective: Artificial Intelligence (AI) in electrocardiogram (ECG) analysis helps to identify persons at risk of developing atrial fibrillation (AF) and reduces the risk for severe complications. Our aim is to investigate the performance of AI-based methods predicting future AF from sinus rhythm (SR) ECGs, according to different characteristics of patients, time intervals for prediction, and longitudinal measures. Methods: We designed a retrospective, prognostic study to predict AF occurrence in patients from 12-lead SR ECGs. We classified patients in two groups, according to their ECGs: 3,761 developed AF and 22,896 presented only SR ECGs. We assessed the impact of age on the overall performance of deep neural network (DNN)-based systems, which consist in a variation of Residual Networks for time series. Then, we analysed how much in advance our system can predict AF from SR ECGs and the performance for different categories of patients with AUC and other metrics. Results: After balancing the age distribution between the two groups of patients, our model achieves AUC of 0.79 (0.72-0.86) without additional constraints, 0.83 (0.76-0.89) for ECGs recorded in the last six months before AF, and 0.87 (0.81-0.93) for patients with stable AF risk measures over time, with sensitivity of 90.62% (80.70-96.48) and diagnostic odd ratio of 20.49 (8.56-49.09). Conclusion: This study shows the ability of DNNs to predict new onsets of AF from SR ECGs, with the best performance achieved for patients with stable AF risk score over time. The introduction of this time-based score opens new possibilities for AF prediction, thanks to the analysis of long-span time intervals and score stabilityEuropean Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No860813 – TReSPAsS-ETNTRESPASS-ET

Improvement of the Electrochemical Behavior of (Sb, Sn, Cu)O Ceramic Electrodes as Electrochemical Advanced Oxidation Anodes

This is the peer reviewed version of the following article: Giner-Sanz, J. J., Sanchez-Rivera, M. J., Garcia-Gabaldon, M., Ortega, E. M., Mestre, S., & Perez-Herranz, V. (2019). Improvement of the Electrochemical Behavior of (Sb, Sn, Cu)O Ceramic Electrodes as Electrochemical Advanced Oxidation Anodes. ChemElectroChem, 6(9), 2430-2437. https://doi.org/10.1002/celc.201801766, which has been published in final form at https://doi.org/10.1002/celc.201801766. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.[EN] This work explores the possibility of increasing the active surface of a Sb-doped SnO2 ceramic electrode using CuO as sintering aid, by incorporating petroleum coke as a pore generator. In order to fulfil this goal, three series of (Sb, Sn, Cu)O electrodes with different coke contents were synthetized. The properties of the electrodes, and their microstructure, change significantly as a function of the coke content before sintering. The electrochemical characterization of the synthesized electrodes showed that the coke addition before sintering causes two antagonist effects on the performance of the (Sn, Sb, Cu)O as anodes in electrochemical advanced oxidation processes (EAOP). On one hand, it significantly improves the electrochemical roughness factor of the electrode, solving the densification problem in this way. On the other hand, it worsens the electrochemical behavior of the electrode: narrowing its electrochemical window; and ¿activating¿ it slightly. The addition of coke before sintering changes the kinetic parameters, leading to a kinetic situation in which the accumulation of hydroxyl radicals is slightly lower. A balance must be sought: an intermediate coke content will improve significantly the electrochemical roughness factor of the electrode, but will only worsen slightly its electrochemical behavior, leading to an optimum (Sn, Sb, Cu)O EAOP anode.The authors are very grateful to the Ministerio de Economia y Competitividad (Projects: CTQ2015-65202-C2-1-R and CTQ2015- 65202-C2-2-R) and to the European Regional Development Fund (FEDER), for their economic support.Giner-Sanz, JJ.; Sánchez-Rivera, MJ.; García Gabaldón, M.; Ortega Navarro, EM.; Mestre, S.; Pérez-Herranz, V. (2019). Improvement of the Electrochemical Behavior of (Sb, Sn, Cu)O Ceramic Electrodes as Electrochemical Advanced Oxidation Anodes. ChemElectroChem. 6(9):2430-2437. https://doi.org/10.1002/celc.201801766S2430243769Schwarzenbach, R. P., Egli, T., Hofstetter, T. B., von Gunten, U., & Wehrli, B. (2010). Global Water Pollution and Human Health. 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Electrochimica Acta, 264, 350-357. doi:10.1016/j.electacta.2018.01.141Giner-Sanz, J. J., Ortega, E. M., & Pérez-Herranz, V. (2017). Experimental Quantification of the Effect of Nonlinearities on the EIS Spectra of the Cathodic Electrode of an Alkaline Electrolyzer. Fuel Cells, 17(3), 391-401. doi:10.1002/fuce.201600137Giner-Sanz, J. J., Ortega, E. M., & Pérez-Herranz, V. (2018). Mechanistic equivalent circuit modelling of a commercial polymer electrolyte membrane fuel cell. Journal of Power Sources, 379, 328-337. doi:10.1016/j.jpowsour.2018.01.066Orazem, M. E., & Tribollet, B. (2008). Electrochemical Impedance Spectroscopy. doi:10.1002/9780470381588Agarwal, P., Orazem, M. E., & Garcia‐Rubio, L. H. (1995). Application of Measurement Models to Impedance Spectroscopy: III . Evaluation of Consistency with the Kramers‐Kronig Relations. Journal of The Electrochemical Society, 142(12), 4159-4168. doi:10.1149/1.2048479Giner-Sanz, J. J., Ortega, E. M., & Pérez-Herranz, V. (2015). Total harmonic distortion based method for linearity assessment in electrochemical systems in the context of EIS. Electrochimica Acta, 186, 598-612. doi:10.1016/j.electacta.2015.10.152Giner-Sanz, J. J., Ortega, E. M., & Pérez-Herranz, V. (2016). Harmonic analysis based method for linearity assessment and noise quantification in electrochemical impedance spectroscopy measurements: Theoretical formulation and experimental validation for Tafelian systems. Electrochimica Acta, 211, 1076-1091. doi:10.1016/j.electacta.2016.06.133Giner-Sanz, J. J., Ortega, E. M., & Pérez-Herranz, V. (2015). Montecarlo based quantitative Kramers–Kronig test for PEMFC impedance spectrum validation. International Journal of Hydrogen Energy, 40(34), 11279-11293. doi:10.1016/j.ijhydene.2015.03.135Giner-Sanz, J. J., Ortega, E. M., & Pérez-Herranz, V. (2016). Application of a Montecarlo based quantitative Kramers-Kronig test for linearity assessment of EIS measurements. Electrochimica Acta, 209, 254-268. doi:10.1016/j.electacta.2016.04.131Giner-Sanz, J. J., Ortega, E. M., & Pérez-Herranz, V. (2015). Optimization of the electrochemical impedance spectroscopy measurement parameters for PEM fuel cell spectrum determination. Electrochimica Acta, 174, 1290-1298. doi:10.1016/j.electacta.2015.06.106Giner-Sanz, J. J., Ortega, E. M., & Pérez-Herranz, V. (2015). Statistical Analysis of the Effect of the Temperature and Inlet Humidities on the Parameters of a PEMFC Model. Fuel Cells, 15(3), 479-493. doi:10.1002/fuce.201400163Giner-Sanz, J. J., Ortega, E. M., & Pérez-Herranz, V. (2014). Hydrogen crossover and internal short-circuit currents experimental characterization and modelling in a proton exchange membrane fuel cell. International Journal of Hydrogen Energy, 39(25), 13206-13216. doi:10.1016/j.ijhydene.2014.06.157Giner-Sanz, J. J., Ortega, E. M., & Pérez-Herranz, V. (2016). Optimization of the Perturbation Amplitude for Impedance Measurements in a Commercial PEM Fuel Cell Using Total Harmonic Distortion. Fuel Cells, 16(4), 469-479. doi:10.1002/fuce.201500141Giner-Sanz, J. J., Ortega, E. M., & Pérez-Herranz, V. (2017). Harmonic Analysis Based Method for Perturbation Amplitude Optimization for EIS Measurements. Journal of The Electrochemical Society, 164(13), H918-H924. doi:10.1149/2.1451713jesGiner-Sanz, J. J., Ortega, E. M., & Pérez-Herranz, V. (2018). Statistical analysis of the effect of temperature and inlet humidities on the parameters of a semiempirical model of the internal resistance of a polymer electrolyte membrane fuel cell. Journal of Power Sources, 381, 84-93. doi:10.1016/j.jpowsour.2018.01.093Hrbac, J., Halouzka, V., Trnkova, L., & Vacek, J. (2014). eL-Chem Viewer: A Freeware Package for the Analysis of Electroanalytical Data and Their Post-Acquisition Processing. Sensors, 14(8), 13943-13954. doi:10.3390/s14081394

Studying the Role of Location in 3D Scene Description using Natural Language

Kluth T, Falomir Z. Studying the Role of Location in 3D Scene Description using Natural Language. In: Sanz I, Museros L, Ortega JA, eds. XV Jornadas de la Asociación de Razonamiento Cualitativo y Aplicaciones (JARCA '13). Sistemas Cualitativos y sus Aplicaciones en Diagnosis, Robótica e Inteligencia Ambiental. Murcia, Spain: Proceedings from the University of Seville; 2013.In this paper the description of 3D indoor scenes in natural language is studied from the point of view of intrinsic and relative location of the objects. An approach has been developed for this purpose which uses a XBox 360 Kinect in combination with ROS and PCL to obtain 3D-data from the scene. Object features are computed on these 3D-data, which are used to generate a SVM-model which classifies the different objects in the scene. After detecting the objects in the scene, their orientation is obtained and qualitative spatial relations between the objects are computed to generate a natural-language description of the scene