Multiclass audio segmentation based on recurrent neural networks for broadcast domain data

This paper presents a new approach based on recurrent neural networks (RNN) to the multiclass audio segmentation task whose goal is to classify an audio signal as speech, music, noise or a combination of these. The proposed system is based on the use of bidirectional long short-term Memory (BLSTM) networks to model temporal dependencies in the signal. The RNN is complemented by a resegmentation module, gaining long term stability by means of the tied state concept in hidden Markov models. We explore different neural architectures introducing temporal pooling layers to reduce the neural network output sampling rate. Our findings show that removing redundant temporal information is beneficial for the segmentation system showing a relative improvement close to 5%. Furthermore, this solution does not increase the number of parameters of the model and reduces the number of operations per second, allowing our system to achieve a real-time factor below 0.04 if running on CPU and below 0.03 if running on GPU. This new architecture combined with a data-agnostic data augmentation technique called mixup allows our system to achieve competitive results in both the Albayzín 2010 and 2012 evaluation datasets, presenting a relative improvement of 19.72% and 5.35% compared to the best results found in the literature for these databases

Prácticas organizativas saludables frente a la violencia en el trabajo. Estudio de su incidencia

Violence at work is a growing problem for organizations. It involves significant costs for the organization, its members and the community. In its various dimensions, organized violence is one of the least investigated. This study provides evidence of the relevance of this dimension has on the development of violent behavior in the workplace. The results indicate that practices an organization implements an impact on levels of violence that occur at work. For the development of healthy organizations, free of violence, the company management must take a holistic approach and look at best practices related to human resource management, with leadership factors or job design

El cambiante mundo de las organizaciones. Hacia una organización saludable

Nuestro modelo actual de sociedad se halla inmerso en un profundo cambio (re-evolución), que nos está conduciendo hacia un mundo «enredado». Las organizaciones, como subsistemas fundamentales de esa sociedad, tienen el reto de digerir el complejo conjunto de transformaciones que estamos viviendo. Uno de los patrones que están emergiendo en las organizaciones, como respuesta a este proceso de cambio, es el de la «salud en la organización». El desarrollo de este patrón se concreta en el constructo «organizaciones saludables», que se caracterizan por promover y potenciar la sinergia positiva entre su propio crecimiento, el de sus miembros y el de la comunidad. La construcción de este tipo de organizaciones se ha convertido en uno de los desafíos del mundo organizacional y, por ende, de la propia sociedad. Su viabilidad y concreción pueden determinar, en buena medida, el modelo social del futuro a medio y largo plazo. El estado de la cuestión es aún demasiado disperso. Se requiere formular un marco referencial que permita orientar el desarrollo de este tipo de organizaciones; un marco que, a su vez, nos ofrezca una conceptualización adecuada para, posteriormente, plantear el desarrollo progresivo de las configuraciones organizativas que posibiliten la evolución íntegra y holística de la salud de la organización, de sus miembros y de la comunidad. Partiendo de la revisión sistemática de información, el presente trabajo ofrece una primera aproximación configuracional en este camino.Our present model of society is engaged in a profound change (re-evolution) that is directing us towards a «networked world». Organizations, as fundamental subsystems of this society, have to cope with the challenge of managing the complex transformation frameset we are experiencing.One of the patterns that is emerging in response to this changing process is health in organization. The development of this pattern draws closer to the construct of healthy organizations, which promote and empower the positive synergy between their own growth, that of their members and that of the community. Building this type of organization has become one of the challenges of the organizational world and, therefore, of society itself. A great deal of the future social model in the mid and long term may depend on their feasibility and concreteness. The state of the art is still too fragmented. A reference framework needs to be formulated that enables these kinds of organization to be developed. The framework should also conceptualize the organization and then progressively develop organizational configurations that lead to the comprehensive and holistic evolution of the health of the organization, its members and the community. On the basis of a systematic review of information, the present paper uses a configurational approach to make an initial proposal

Refractometric sensor based on whispering-gallery modes of thin capillaries

Whispering-gallery modes resonances of submicron wall thickness capillaries exhibit very large wavelength shifts as a function of the refractive index of the medium that fills the inside. The sensitivity to refractive index changes is larger than in other optical microcavities as microspheres, microdisks and microrings. The outer surface where total internal reflection takes place remains always in air, enabling the measure of refractive index values higher than the refractive index of the capillary material. The fabrication of capillaries with submicron wall thickness has required the development of a specific technique. A refractometer with a response higher than 390 nm per refractive index unit is demonstrated. These sensors are readily compatible with microfluidic systems

Plasticizing effect of biobased epoxidized fatty acid esters on mechanical and thermal properties of poly(lactic acid)

Poly(lactic acid), PLA, is a polyester that can be produced from lactic acid derived from renewable resources. This polymer offers attracting uses in packaging industry due to its biodegradability and high tensile strength. However, PLA is quite brittle, which limits its applications. To overcome this drawback, PLA was plasticized with epoxy-type plasticizer derived from a fatty acid, octyl epoxy stearate (OES) at different loadings (1, 3, 5, 10, 15, and 20 phr). The addition of OES decreases the glass transition temperature and provides a remarkable increase in elongation at break and impact-absorbed energy. Plasticizer saturation occurs at relatively low concentrations of about 5 phr OES; higher concentration leads to phase separation as observed by field emission scanning electron microscopy (FESEM). Optimum balanced mechanical properties are obtained at relatively low concentrations of OES (5 phr), thus indicating the usefulness of this material as environmentally friendly plasticizer for PLA industrial formulations.This research was supported by the Ministry of Economy and Competitiveness-MINECO, Ref: MAT2014-59242-C2-1-R. Authors also thank to "Conselleria d'Educacio, Cultura i Esport"-Generalitat Valenciana, Ref: GV/2014/008 for financial support.Ferri Azor, JM.; Samper Madrigal, MD.; García Sanoguera, D.; Reig Pérez, MJ.; Fenollar Gimeno, OÁ.; Balart Gimeno, RA. (2016). Plasticizing effect of biobased epoxidized fatty acid esters on mechanical and thermal properties of poly(lactic acid). Journal of Materials Science. 51(11):5356-5366. https://doi.org/10.1007/s10853-016-9838-2S535653665111Alam J, Alam M, Raja M, Abduljaleel Z, Dass LA (2014) MWCNTs-reinforced epoxidized linseed oil plasticized polylactic acid nanocomposite and its electroactive shape memory behaviour. 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Effect of miscibility on mechanical and thermal properties of poly(lactic acid)/polycaprolactone blends

This is the accepted version of the following article: Ferri, J. M.; Fenollar, O.; Jorda-Vilaplana, A.; Garcia-Sanoguera, D.; Balart, R. (2016). "Effect of miscibility on mechanical and thermal properties of poly(lactic acid)/polycaprolactone blends". Polymer International. 65(4):453-463. doi:10.1002/pi.5079., which has been published in final form at http://dx.doi.org/10.1002/pi.5079 .Binary blends based on poly(lactic acid) (PLA) and polycaprolactone (PCL) were prepared by melt mixing in a twin-screw co-rotating extruder in order to increase the low intrinsic elongation at break of PLA for packaging applications. Although PLA and PCL show low miscibility, the presence of PCL leads to a marked improvement in the ductile properties of PLA. Various mechanical properties were evaluated in terms of PCL content up to 30wt% PCL. In addition to tensile and flexural properties, Poisson s ratio was obtained using biaxial extensometry to evaluate transversal deformations when axial loads are applied. Very slight changes in the melt temperature and glass transition temperature of PLA are observed thus indicating the low miscibility of the PLA PCL system. Field emission scanning electron microscopy reveals some interactions between the two components of the blend since the morphology is characterized by non-spherical polycaprolactone drops dispersed into the PLA matrix. In addition to the improvement of mechanical ductile properties, PCL provides higher degradation rates of blends under conditions of composting for contents below 22.5% PCL.This research was supported by the Ministry of Economy and Competitiveness - MINECO, ref. MAT2014-59242-C2-1-R. The authors also thank the Conselleria d'Educacio, Cultura i Esport - Generalitat Valenciana, ref. GV/2014/008 for financial support.Ferri Azor, JM.; Fenollar Gimeno, OÁ.; Jorda-Vilaplana, A.; García Sanoguera, D.; Balart Gimeno, RA. (2016). Effect of miscibility on mechanical and thermal properties of poly(lactic acid)/polycaprolactone blends. Polymer International. 65(4):453-463. https://doi.org/10.1002/pi.5079S45346365

Multimodal Diarization Systems by Training Enrollment Models as Identity Representations

This paper describes a post-evaluation analysis of the system developed by ViVoLAB research group for the IberSPEECH-RTVE 2020 Multimodal Diarization (MD) Challenge. This challenge focuses on the study of multimodal systems for the diarization of audiovisual files and the assignment of an identity to each segment where a person is detected. In this work, we implemented two different subsystems to address this task using the audio and the video from audiovisual files separately. To develop our subsystems, we used the state-of-the-art speaker and face verification embeddings extracted from publicly available deep neural networks (DNN). Different clustering techniques were also employed in combination with the tracking and identity assignment process. Furthermore, we included a novel back-end approach in the face verification subsystem to train an enrollment model for each identity, which we have previously shown to improve the results compared to the average of the enrollment data. Using this approach, we trained a learnable vector to represent each enrollment character. The loss function employed to train this vector was an approximated version of the detection cost function (aDCF) which is inspired by the DCF widely used metric to measure performance in verification tasks. In this paper, we also focused on exploring and analyzing the effect of training this vector with several configurations of this objective loss function. This analysis allows us to assess the impact of the configuration parameters of the loss in the amount and type of errors produced by the system

Surface modification of polypropylene substrates by UV photografting of methyl methacrylate (MMA) for improved surface wettability

The final publication is available at Springer via http://dx.doi.org/10.1007/s10853-011-6056-9Despite polypropylene is one of the most used commodity plastics, its adhesion properties are remarkably restricted by its non-polar nature which leads to low wetting properties and, consequently, poor adhesion behavior. We report the use of ultraviolet photografting process of methyl methacrylate (MMA) monomer as an efficient chemical treatment for surface activation of polypropylene. Contact angle measurements are used for evaluating changes in polypropylene wetting properties together with surface free energy calculations. Chemical changes are showed in terms of the exposure time to UV radiation. Scanning electron microscopy has been used to evaluate topography changes in a qualitative way; atomic force microscopy has been used for a quantitative evaluation of surface changes in terms of roughness. The use of Fourier transformed infrared spectroscopy has revealed the nature of the chemical changes induced by the photografting process of MMA. © 2011 Springer Science+Business Media, LLC.This study is a part of the project IPT-310000-2010-037, "ECOTEXCOMP: Research and development of textile structures useful as reinforcement of composite materials with marked ecological character" funded by the "Ministerio de Ciencia e Innovacion," with an aid of 189540.20 euros, within the "Plan Nacional de Investigacion Cientifica, Desarrollo e Innovacion Tecnologica 2008-2011" and funded by the European Union through FEDER funds, Technology Fund 2007-2013, Operational Programme on R + D + i for and on behalf of the companies." Also, microscopy services at UPV are acknowledged for SEM and AFM support.Balart Gimeno, JF.; Fombuena Borrás, V.; Boronat Vitoria, T.; Reig Pérez, MJ.; Balart Gimeno, RA. (2012). Surface modification of polypropylene substrates by UV photografting of methyl methacrylate (MMA) for improved surface wettability. Journal of Materials Science. 47(5):2375-2383. doi:10.1007/s10853-011-6056-9S23752383475Novak I, Florian S (2001) J Mater Sci 36(20):4863. doi: 10.1023/A:1011895000500Sanchis MR et al (2007) J Appl Polym Sci 105(3):1077Sanchis R et al (2008) Int J Adhes Adhes 28(8):445Sanchis RM et al (2007) J Polym Sci Part B 45(17):2390Deng HP, Yang WT (2005) Eur Polym J 41(11):2685Lisboa P et al (2006) Appl Surf Sci 252(13):4397Wang YX et al (2005) Macromol Rapid Commun 26(2):87Xing CM, Deng JP, Yang WT (2005) Macromol Chem Phys 206(11):1106El Kholdi O et al (2004) J Appl Polym Sci 92(5):2803Piletsky SA et al (2000) Macromolecules 33(8):3092Susanto H, Ulbricht M (2007) Langmuir 23(14):7818Ulbricht M (1996) React Funct Polym 31(2):165Ulbricht M, Riedel M, Marx U (1996) J Membr Sci 120(2):239Villagra Di Carlo B, Carlos Gottifredi J, Claudio Habert A (2011) J Mater Sci 46(6):1850. doi: 10.1007/s10853-010-5012-4Yang GH et al (2001) Langmuir 17(1):211Kang ET et al (1996) J Mater Sci 31(5):1295. doi: 10.1007/BF00353109Zhu JW et al (2006) Macromol Chem Phys 207(1):75Kong LB, Deng JP, Yang WT (2006) Macromol Chem Phys 207(24):2311Xing CM, Deng JP, Yang WT (2002) Polym J 34(11):801Xing CM, Deng JP, Yang WT (2002) Polym J 34(11):809Janorkar AV, Metters AT, Hirt DE (2004) Macromolecules 37(24):9151Tan L, Deng JP, Yang WT (2004) Polym Adv Technol 15(9):523Deng JP, Yang WT, Ranby B (2001) J Appl Polym Sci 80(9):1426Deng JP, Yang WT (2005) J Appl Polym Sci 95(4):903Balart J et al (2010) J Appl Polym Sci 116(6):3256Kaczmarek H (1995) Polimery 40(6):333Khan MA, Shehrzade S, Hassan MM (2004) J Appl Polym Sci 92(1):18Ganan P, Mondragon I (2004) J Mater Sci 39(9):3121. doi: 10.1023/B:JMSC.0000025841.67124.c3Maerder E et al (2007) J Mater Sci 42(19):8047. doi: 10.1007/s10853-006-1311-1Zhao Y et al (2007) J Mater Sci 42(19):8287. doi: 10.1007/s10853-007-1624-8Xing CM, Deng JP, Yang WT (2005) J Appl Polym Sci 97(5):2026Srilatha T, Rao PR (2007) Asian J Chem 19(5):3755Moon JH et al. (2007) Progress Organ Coat 59(2):106Ramesh S et al (2007) Spectrochim Acta Part A 66(4–5):123

El correo electrónico: recomendaciones para su gestión documental en la Universidad de Zaragoza

El presente trabajo de grado estudia el problema existente en las universidades españolas en general y la Universidad de Zaragoza en particular acerca de la gestión documental del correo electrónico. El objetivo del trabajo es proponer unas recomendaciones que puedan servir de base para elaborar las directrices que deberían regir un programa para la reunión, identificación, valoración, organización y conservación del correo electrónico producido por la Universidad de Zaragoza. Para ello se ha realizado una búsqueda y análisis de información relevante, un estudio de la situación de las universidades españolas y la Universidad de Zaragoza en particular, y por último, se propone una propuesta de recomendaciones para mejorar la gestión

Percepción de utilidad e importancia de la educación física según la motivacion generada por el docente

El principal objetivo del estudio ha sido comprobar la capacidad de predicción del clima motivacional trasmitido por el profesor en el aula, los mediadores psicológicos y la motivación autodeterminada (representada por el índice de autodeterminación) sobre la importancia y utilidad concedidas por el alumno a la Educación Física, así como las posibles relaciones que se dan entre dichas variables. Para ello se utilizó una muestra de 819 alumnos (417 chicos y 402 chicas) del municipio de Murcia, con edades comprendidas entre los 14 y los 17 años, (M = 1,47; DT = .49). Los instrumentos utilizados han sido el cuestionario de la orientación al aprendizaje y el rendimiento en las clases de Educación Física (LAPOPEQ), la escala de motivación deportiva (SMS), la escala de mediadores psicológicos y la escala de importancia de la Educación Física (PEI)