Search results for "Comunicaciones"
showing 10 items of 175 documents
Desarrollo y análisis de sensores inalámbricos y sistemas asociados de IoT
2023
En los últimos años, la tecnología del Internet de las cosas (IoT) se ha vuelto cada vez más importante. Al ofrecer un medio para conectar dispositivos y establecer conexiones en tiempo real, el IoT ha facilitado el monitoreo y la gestión de entidades tangibles, como electrodomésticos, vehículos y edificios. Típicamente, un sistema IoT incorpora numerosos dispositivos que se comunican entre sí a través de gateways y servidores en la nube que alojan aplicaciones web y móviles. Los usuarios finales pueden interactuar sin problemas con sus dispositivos IoT, lo que les otorga una mayor accesibilidad y conveniencia. Dado su capacidad para proporcionar control y automatización en tiempo real, el …
BIO Bragg gratings on microfibers for label-free biosensing
2021
[EN] Discovering nanoscale phenomena to sense biorecognition events introduces new perspectives to exploit nano science and nanotechnology for bioanalytical purposes. Here we present Bio Bragg Gratings (BBGs), a novel biosensing approach that consists of diffractive structures of protein bioreceptors patterned on the surface of optical waveguides, and tailored to transduce the magnitude of biorecognition assays into the intensity of single peaks in the reflection spectrum. This work addresses the design, fabrication, and optimization of this system by both theoretical and experimental studies to explore the fundamental physicochemical parameters involved. Functional biomolecular gratings ar…
Elaboració i desenvolupament d'un llibre multimèdia sobre programació matemàtica
2008
La elaboración de manuales adaptados al enfoque de enseñanza-aprendizaje que hagan uso de las ventajas didácticas de las tecnologías de la información y de las comunicaciones es un requisito fundamental para el éxito del proceso de innovación educativa en el que está comprometida la universidad española. Este artículo realiza una reflexión sobre las características que debe poseer un buen manual multimedia para cumplir con este reto, presenta un método para la elaboración de libros multimedia y demuestra que ese método se puede implementar con éxito presentando el libro multimedia “Programación matemática para la economía y la empresa”
Advanced Analysis of Propagation Losses in Rectangular Waveguide Structures Using Perturbation of Boundary Conditions
2011
In this paper, propagation losses effects present in rectangular waveguide structures are rigorously considered. For this purpose, a new formulation based on the perturbation of the boundary conditions on the metallic walls of the waveguides combined with an Integral-Equation (IE) analysis technique is proposed. Following this advanced technique, the drawbacks of the classical power-loss method are overcome and a complex modal propagation constant is computed. To validate this theory, we have successfully compared our results with numerical data of lossy hollow waveguides. Next, a Computed-Aided-Design (CAD) software package based on such a novel modal analysis tool has been used to predict…
Feasible glass‐melting process assisted by microwaves
2019
[EN] The advantages of microwave (MW) energy processing have been verified in the sintering of a ceramic frit at a pre-industrial scale. The challenge of achieving high temperature using MW energy at such dimensions was overcome and a mix of natural raw materials was heated until its fluxing point. Changes in dielectric properties of the raw materials mix were also measured in situ with the increase in temperature, being in accordance to thermal processes of a conventional heating process. The properties of the resulting ceramic frit were compared with the same frit obtained by the conventional sintering method. Both frits showed similar thermal behavior regarding DTA-TGA, heating microscop…
Effect of an upright (vs. stooped) posture on interpretation bias, imagery, and emotions
2020
[EN] Background and objectives: Adopting an upright (vs. stooped) posture has been related to positive effects on emotional and cognitive processes. However, there is no evidence concerning the effect of posture on two key processes associated with the maintenance of depression: interpretation bias and vividness of mental imagery. The objectives were to investigate the effect of adopting an upright (vs. stooped) posture on interpretation bias and vividness of positive and negative mental imagery, and to explore the interplay between these processes and depression-related emotions. Methods: The sample consisted of 54 participants (M-age = 22.00, 64.8% women), who were randomly assigned to th…
Body schema plasticity after stroke: subjective and neurophysiological correlates of the rubber hand illusion
2017
[EN] Stroke can lead to motor impairments that can affect the body structure and restraint mobility. We hypothesize that brain lesions and their motor sequelae can distort the body schema, a sensorimotor map of body parts and elements in the peripersonal space through which human beings embody the reachable space and ready the body for forthcoming movements. Two main constructs have been identified in the embodiment mechanism: body-ownership, the sense that the body that one inhabits is his/her own, and agency, the sense that one can move and control his/her body. To test this, the present study simultaneously investigated different embodiment subcomponents (body-ownership, localization, an…
Assessing the Impact of Temporary Retail Price Discounts Intervals Using SVM Semiparametric Regression
2009
Although the marketing literature has found that temporary retail price discounts cause a significant sales increase, little is known about the specific characteristics of deals that influence the magnitude of the sales spike. In this paper, we analyse the impact of the length of temporary retail price discounts periods on the sales increase using scanner-store daily-sales data for two frequently purchased product categories: ground coffee (a storable category) and yogurt (a perishable category).Wedevelop a robust semiparametric regression model based on support vector statistical theory with several previously proposed predictors along with a daily time description. This model also makes i…
Evaluating temporary retail price discounts using semiparametric regression
2009
PurposeTo analyze the impact of temporary retail price discount on a consumer goods product category using semiparametric regression and considering different promotional price discount characteristics as well as brand characteristics.Design/methodology/approachA semiparametric regression model using Support Vector Machines, which aim to evaluate retailers' decisions about temporary price discounts, has been developed. The model is derived from the analysis of historical sales data, which provide precise evaluation of previous temporary price discounts periods. The model is also consistent with ample empirical evidence showing that historical retail sales data can be used to evaluate the im…
Using Daily Store-level Data to Understand Price Promotion Effects in a Semiparametric Regression Model
2009
Though it has been widely reported in the marketing literature that temporary price discounts generate substantial short-term sales increase, the shape of the deal effect curve constitutes a key research topic, for which there are still limited empirical results. To address this issue, a semiparametric regression approach is used to model the complex nature of this phenomenon. Our model is developed at the brand level using daily store-level scanner-data, which allows the study of several nonreported promotional effects, such as the influence of the day of the week both in promotional and nonpromotional periods. The results show that the weekend is the most effective in increasing promotion…