Search results for "Digital"
showing 10 items of 3267 documents
Bed Topography Reconstruction in a Large Amplitude Meandering Flume: Application of Close Range Photogrammetry
2014
Natural rivers are characterized by continuous variations in bed topography, especially along curved reaches. High resolution topographic data are necessary to analyze the mutual interactions between the downstream flow and the cross-stream flow, which determine the distribution of the bed-shear stress along the channel. Because of the difficulty in acquiring good and accurate data in rivers, the major part of studies have been conducted in laboratory flumes. This paper reports on a laboratory study in which the automatic digital photogrammetric survey was applied to derive the high-resolution Digital Surface Model (DSM) of the bed topography in a large amplitude meandering flume. In order …
Monitoring Human Neutrophil Differentiation by Digital Holographic Microscopy
2021
We report on the usefulness of digital holographic microscopy (DHM) for the assessment of human neutrophil differentiation from myeloid cells. The cell and nuclear regions have been designated by image segmentation of the optical phase function, and the changes of the cell nucleus morphology in relation to the whole cell morphology have been examined during the process of granulocytic differentiation into mature neutrophils in PLB-985 cell line. Nucleus phase volume and circularity and the ratios between the nucleus and the cell projected area and volume provide a reliable set of parameters to characterize the maturation process. As control, cell differentiation has been monitored in parall…
Designing digital well-being of senior citizens
2020
In this paper, we illustrate a concrete case to apply the Life-Based Design approach to identifying human goals for technology to achieve. We focus on a form-of-life method of design, which seeks to reach a mental state of “digital wellbeing.” Digital well-being aims to facilitate digitalization and changes in the digital environment, and to maximize the availability and accessibility of services. We evaluate the target group of senior citizens, who are facing an accelerating pace of digitalization of the services in their daily lives. This increases their sense of anxiety and undermines their well-being. peerReviewed
Seguimiento digitalizado combinado en población con alto riesgo de desarrollar un melanoma maligno: análisis retrospectivo de 152 pacientes
2021
Resumen: Antecedentes: La dermatoscopia digitalizada (DD) ha demostrado mejorar la precisión en el diagnóstico del melanoma (MM) en pacientes de alto riesgo. La combinación de DD y fotografía corporal total (FCT) puede facilitar la detección de nuevas lesiones o la aparición de cambios macroscópicos precoces en lesiones previamente registradas. Objetivos: El objetivo del presente estudio fue determinar el número de biopsias necesarias para diagnosticar un MM y, las características clínicas y dermatoscópicas asociadas al diagnóstico de melanoma en pacientes en seguimiento, mediante DD y FCT, de lesiones pigmentadas. Pacientes y métodos: Se realizó un estudio retrospectivo de 152 pacientes co…
Un enigma architettonico tra storia, disegno e ricostruzioni: la chiesa di San Nicolò alla Kalsa a Palermo
2022
Il contributo affronta lo studio di un monumento scomparso della città di Palermo, la chiesa parrocchiale di San Nicolò alla Kalsa, che aveva rivestito un ruolo significativo nel contesto urbano medievale e della prima età moderna, conoscendo successivamente un progressivo abbandono e degrado fino alla sua demolizione dopo il 1823, e ne propone una ricostruzione virtuale attraverso l’elaborazione di un modello 3D. Strumento principale per la conoscenza dell’edificio scomparso è un’articolata iconografia storica, che spazia dalla scala urbana a quella del dettaglio architettonico, qui vagliata per desumerne dati necessari alla formulazione di un’ipotesi ricostruttiva attendibile e scientific…
Análisis de plataformas digitales y competencias del profesorado en entornos virtuales
2018
Las tecnologías digitales han entrado en la escuela y en la universidad de forma imparable y el profesorado ha de afrontar el reto de responder a las necesidades educativas y al contexto de la sociedad del siglo XXI. Para ello, hemos de alcanzar las competencias necesarias para trabajar en entornos virtuales y también facilitar espacios de reflexión donde sea posible la construcción del conocimiento de forma cooperativa. A través del instrumento-guía para el análisis de las plataformas y/o portales web del grupo CRIE de la Universidad de Valencia, examinamos dos plataformas virtuales, para recalar en el tema de las competencias que ha de dominar el profesorado y el modelo de enseñanza que s…
Rol de las familias. Escuelas y docentes en las interacciones entre tecnología digital y primera Infancia y sus posibles efectos
2022
En este capítulo se pretende describir los usos e influencia de la tecnología centrados en la Primera Infancia, tanto en la escuela como en el hogar. Se reflexiona sobre la interacción entre infancia, tecnología, familias y escuela, partiendo de la Teoría ecológica de sistemas y en el marco de la sociedad digital del siglo XXI. This chapter aims to describe the uses and influence of technology focused on Early Childhood, both at school and at home. It reflects on the interaction between childhood, technology, families and school, based on the ecological theory of systems and within the framework of the digital society of the 21st century. Se destaca el papel relevante que tiene la comunicac…
A Novel Linear-Non-Linear Digital Control for DC/DC Converter with Fast Transient Response
2006
In this paper, a digitally controlled multimodule DC-DC converter with fast transient response, based on a linear-nonlinear control is presented. The proposed digital control improves the stability of the system, cuts off the effects of limit-cycle and reduces the recovery time, by making the "effective" bandwidth of the system independent of the bandwidth of the linear control loop and limits, at the same time, output voltage variations. The digital control is AVP-compatible and halves the recovery time. Preliminary hardware tests on a single phase step-down converter are reported. The experimental results match simulation ones, obtained by modelling system with Matlab/Aldec mixed environm…
Digital power conversion system based on a sigma-delta modulator linear model
2005
This paper presents a new linear model for the sigma-delta (/spl Sigma//spl Delta/) modulator, based on modeling the nonlinear quantizer with a linear factor, and its input-to-output transfer function is given. The use of a 1-bit sigma-delta modulator in DC/DC power converter systems permits to implement a complete digital control. Results of an investigation from a prototype for a DC-DC converter are here reported. Using of a field programmable gate array allows implementing a simple variable control function. The modulator output produces a variable-frequency variable duty-ratio signal to control the switching power transistors.
Linear-non-linear digital control for dc/dc converters with fast transient response
2009
A linear-non-linear digital control for multi-module DC/DC converters that improves system stability, solves the limit-cycle problem, reduces recovery time and limits over- and under-shoots in regulated output voltage, is presented. A simulation model in Matlab-Simulink/Active-HDL mixed environment is described. Preliminary hardware tests on a single-phase step-down converter are reported. Simulation and experimental results are shown.