VI Curso de Archivos e Historia: Las fuentes.

Sin resume

How advocacy and interactivity facilitate customer value co-creation behaviour in Instagram: a micro-perspective of unplanned and voluntary usage of hedonic social networking sites

Our study offers a new conceptual model of value co-creation in hedonic social network sites, and it validates an adaptation of the Coleman bathtub to social interaction in Instagram. Few papers have studied empirically interactive platforms for value co-creation in the focal context of a service ecosystem under service-dominant logic. We use a CB-SEM methodological approach to quantitatively test the hypothesised connections between constructs in our structural model. The analysis of the statistical results allows us to validate the direct, indirect and total effects between the latent variables in the model. Furthermore, it empirically shows, for the studied sample of Instagrammers, the dual nature of interactivity, both networked and perceived; how customer participation behaviour relates to customer relationships with other Instagrammers; the resource integration patterns of social capital and the choreography of relational value; and finally as well as the positive impact of increased advocacy levels on customer participation behaviour during the unplanned and voluntary usage of Instagram.Nuestro estudio ofrece un nuevo modelo conceptual de cocreación de valor en redes sociales hedónicas, y valida la adaptación del bote de Coleman a la interacción social en Instagram. Pocos estudios se han realizado para investigar empíricamente las plataformas interactivas para la cocreación de valor en el contexto de un ecosistema de servicios bajo la lógica dominante del servicio. Utilizamos el enfoque metodológico del modelo de ecuaciones estructurales basado en la covarianza para comprobar cuantitativamente las relaciones causales hipotéticas entre constructos en nuestro modelo estructural. El análisis de los resultados estadísticos nos permite validar los efectos directos, indirectos y totales entre las variables latentes del modelo. Además, se demuestra empíricamente para la muestra de instagrammers la naturaleza dual de la interactividad, en la interactividad en red y en la percepción de la interactividad; cómo el comportamiento participativo del cliente influye en las relaciones personales con otros instagrammers; los patrones de integración de recursos del capital social y la coreografía del valor relacional; y finalmente el impacto positivo que tienen los niveles de adopción aumentados sobre el comportamiento ciudadano del cliente durante el uso no planificado y voluntario de Instagram.El nostre estudi ofereix un nou model conceptual de cocreació de valor en xarxes socials hedòniques, i valida l'adaptació del pot de Coleman a la interacció social a Instagram. Pocs estudis s'han realitzat per investigar empíricament les plataformes interactives per a la cocreació de valor en el context d'un ecosistema de serveis sota la lògica dominant del servei. Utilitzem l'enfocament metodològic del model d'equacions estructurals basat en la covariància per comprovar quantitativament les relacions causals hipotètiques entre constructes en el nostre model estructural. L'anàlisi dels resultats estadístics ens permet validar els efectes directes, indirectes i totals entre les variables latents del model. A més, es demostra empíricament per a la mostra d'instagramers la naturalesa dual de la interactivitat, en la interactivitat en xarxa i en la percepció de la interactivitat; com el comportament participatiu del client influeix en les relacions personals amb altres instagramers; els patrons de integració de recursos del capital social i la coreografia de la valor relacional; i finalment l'impacte positiu que tenen els nivells d'adopció augmentats sobre el comportament ciutadà del client durant l'ús no planificat i voluntari d'Instagram

Franciscanos contra millones: un conflicto fiscal en el siglo XVII.

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Franciscanos contra millones: un conflicto fiscal en el siglo XVII.

Sin resume

Powers of the Stochastic Gompertz and Lognormal Diffusion Processes, Statistical Inference and Simulation

In this paper, we study a new family of Gompertz processes, defined by the power of the homogeneous Gompertz diffusion process, which we term the powers of the stochastic Gompertz diffusion process. First, we show that this homogenous Gompertz diffusion process is stable, by power transformation, and determine the probabilistic characteristics of the process, i.e., its analytic expression, the transition probability density function and the trend functions. We then study the statistical inference in this process. The parameters present in the model are studied by using the maximum likelihood estimation method, based on discrete sampling, thus obtaining the expression of the likelihood estimators and their ergodic properties. We then obtain the power process of the stochastic lognormal diffusion as the limit of the Gompertz process being studied and go on to obtain all the probabilistic characteristics and the statistical inference. Finally, the proposed model is applied to simulated data.This research has been funded by “Programa Operativo FEDER de Andalucía 2014-2020 A-FQM228-UGR18

Stochastic Brennan–Schwartz Diffusion Process: Statistical Computation and Application

In this paper, we study the one-dimensional homogeneous stochastic Brennan–Schwartz diffusion process. This model is a generalization of the homogeneous lognormal diffusion process. What is more, it is used in various contexts of financial mathematics, for example in deriving a numerical model for convertible bond prices. In this work, we obtain the probabilistic characteristics of the process such as the analytical expression, the trend functions (conditional and non-conditional), and the stationary distribution of the model. We also establish a methodology for the estimation of the parameters in the process: First, we estimate the drift parameters by the maximum likelihood approach, with continuous sampling. Then, we estimate the diffusion coefficient by a numerical approximation. Finally, to evaluate the capability of this process for modeling real data, we applied the stochastic Brennan–Schwartz diffusion process to study the evolution of electricity net consumption in Morocco.This research was funded by LAMSAD from “Fonds propres de l’Université Hassan I” (Morroco) and FQM-147 from “Plan Andaluz de Investigaciòn” (Spain)

Two-Parameter Stochastic Weibull Diffusion Model: Statistical Inference and Application to Real Modeling Example

This paper describes the use of the non-homogeneous stochastic Weibull diffusion process, based on the two-parameter Weibull density function (the trend of which is proportional to the two-parameter Weibull probability density function). The trend function (conditioned and non-conditioned) is analyzed to obtain fits and forecasts for a real data set, taking into account the mean value of the process, the maximum likelihood estimators of the parameters of the model and the computational problems that may arise. To carry out the task, we employ the simulated annealing method for finding the estimators values and achieve the study. Finally, to evaluate the capacity of the model , the study is applied to real modeling data where we discuss the accuracy according to error measures.This reasearch was financed by LAMSAD from “Fonds propres de l’Université Hassan I” (Morocco) and FQM-147 from “Plan Andaluz de l’Investigaciòn” (Spain)

Eyelid Exfoliation Treatment Efficacy and Safety in Dry Eye Disease, Blepharitis, and Contact Lens Discomfort Patients: A Systematic Review

Purpose: To determine the efficacy and safety of eyelid exfoliation treatment in dry eye disease (DED), blepharitis, and contact lens (CL) discomfort patients. Methods: A systematic review that included only full-length randomized controlled studies, reporting the effects of eyelid exfoliation treatment in 2 databases, PubMed and Web of Science, was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement. The search period was between October 29, 2022 and December 6, 2022. The Cochrane risk of bias tool was used to analyze the quality of the studies selected. Results: A total of 7 studies were included in this systematic review. Eyelid exfoliation treatment influence on DED, blepharitis, and CL discomfort were analyzed in 6, 4, and 2 studies, respectively. Eyelid exfoliation treatment achieved a better improvement than control group interventions in all reported variables. The mean differences between both groups were as follows: Ocular Surface Disease Index score of-5.0 ± 0.9 points, tear breakup time of 0.43 ± 0.2 seconds, ocular surface staining of-1.4 ± 1.5 points, meibomian glands secretions of 1.2 ± 1.1 points, meibomian glands yielding liquid secretion of 0.6 ± 0.3 points, microorganism load of-3.2 ± 4.7 points, and Contact Lens Dry Eye Questionnaire-8 of-2.15 ± 0.1 points. Minimal discomfort (n = 13) and eyelid irritation (n = 2) were the main complications after an eyelid exfoliation treatment. Conclusions: Eyelid exfoliation is a safe and effective treatment that should be indicated for DED, blepharitis, and CL discomfort

Modelo holónico de la ingeniería del producto

En el presente trabajo se formula un modelo holónico de la Ingeniería del Producto,soportado por las siguientes entidades holónicas: Estrategia de Producto, Producto, Proceso, Entorno de Diseño y Desarrollo. Dicho modelo se fundamenta desde los principios holónicos propuestos por Koestler y la teoría de la variedad de Ashby. Esta formulación permite dar soporte a: los requerimientos de empresa y producto extendido y virtual, así como al diseño colaborativo y distribuido inteligente.The present work we formulated a holonic model of the Product Engineering, it is supported by the following holonics entities: Product Strategy, Product, Process, Design and Development Context. This model has a foundation from holonics principles proposed by Koestler and the Ashby theory of varieties. This formulation permits giving support to: Company's requests and extended and virtual product, furthermore the collaborative and distributed intelligent

Contraste de las formulaciones existentes para la estimación de la tasa de rebase en diques de abrigo portuario

The research that is summarized in this article, resultant of diverse studies realized in the CEDEX, has for object a comparative analysis of methods of overtopping rates developed by different authors. For that, the summary was realized first and the analysis of the existing formulations to estimate the rate of overtopping on rubble mound and vertical breakwaters. Later, there was carried out the contrast of the above mentioned formulations by the results obtained in two hydraulic model tests of the Hydraulic Research Laboratory (Center of Studies of Ports and Coasts of the CEDEX, Madrid, Spain)