DeustoTeka
DeustoTeka recoge la producción científica del personal docente e investigador de la Universidad de Deusto. Su propósito es reunir, archivar, preservar y aumentar la visibilidad en acceso abierto de los resultados de investigación.
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A nested weighted framework for Podlubny-type fractional PID controllers
(Elsevier Ltd, 2026-12-01) Di Teodoro, Antonio; Gude, Juan José
; Camacho, Oscar
This paper presents a unified nested weighted framework for the systematic synthesis of Podlubny-type fractional PID controllers through the constructive generation of generalized fractional operators. The proposed methodology adopts a composition-based perspective in which generalized fractional operators are recursively constructed from weighted differential and integral mappings, allowing classical formulations, including the Riemann–Liouville and Caputo operators, to be recovered as particular cases. Within this framework, a novel pulling-type weighted fractional operator is introduced and its fundamental analytical properties, including linearity, kernel characterization, boundedness, semigroup behavior, and Laplace-domain representation, are rigorously established. These results provide the mathematical foundation for deriving a generalized family of weighted Podlubny-type fractional PID controllers, where the weighting functions become explicit design parameters governing memory distribution and closed-loop dynamics. Consequently, the proposed framework transforms the construction of generalized fractional operators into a systematic methodology for fractional controller synthesis, establishing a constructive link between generalized fractional calculus and fractional-order control design.
From disintermediation to digital reintermediation: evidence from Madrid hotels and european benchmark Studies
(Multidisciplinary Digital Publishing Institute (MDPI), 2026-08-24) Muñoz JdeS, Alejandro; Alzua Sorzabal, Aurkene
; Schegg, Roland
Digital transformation has fundamentally reshaped hospitality distribution ecosystems, altering how hotels connect with customers, manage commercial relationships, and access market demand. While early digitalization narratives anticipated a process of disintermediation, the growing influence of platform-based intermediaries suggests a different trajectory. This study examines how digital transformation has reconfigured hotel distribution ecosystems through a comparative temporal analysis combining reservation-channel data for the 2023 operating period collected from a survey of Madrid hotels, with European benchmark studies spanning 2011–2023. Distribution channels were classified as traditional channels, direct digital channels, and digitally intermediated integrated channels (DIICs) according to their degree of technological integration and intermediary control. The harmonized evidence indicates a decline in the harmonized traditional channel, moderate growth in direct digital channels, and higher DIIC reservation shares across the harmonized benchmark evidence. Early European benchmark studies generally reported DIIC shares of approximately 22–24%, whereas the participating Madrid hotels recorded an average share of 49.3%. Overall, the harmonized evidence is consistent with a long-term shift towards digitally intermediated integrated channels, suggesting that digital transformation has reinforced digital reintermediation rather than effective disintermediation. The study contributes to the literature by providing comparative evidence of long-term changes in hotel distribution structures and by introducing the DIIC framework as an analytical lens for examining digitally mediated intermediation. More broadly, the findings support perspectives that conceptualize tourism digital transformation as a process of platformization and ecosystem reconfiguration rather than simply the adoption of new technologies.
Toponimia alavesa: cuestiones de normativización
(Sociedad de Estudios Vascos = Eusko Ikaskuntza, 2008) Galé García, Patxi; Landa Serrano, Aitziber; Mujika Ulazia, Nerea
El castellano del País Vasco (bilingüe y monolingüe) presenta usos no estándares de construcciones nativas explicables como resultado de influencia indirecta del euskera. Sin embargo, la inexistencia de paralelismo estructural pleno entre construcciones de ambas lenguas o las propias tendencias internas de la lengua castellana impiden que otros usos noveles pasen del locus del contacto (mente del bilingüe) al sistema.
Ride comfort analysis of transient real world road signals through accurate frequency component identification
(Elsevier B.V., 2026-12) Montserrat Coll, Óscar; García Barruetabeña, Jon
This paper presents a ride-comfort strategy for non-stationary road excitations. Because real road inputs are transient, accurate identification of their frequency, amplitude, and damping components is essential for subsequent comfort assessment. The proposed methodology performs short-time analysis by combining autoregressive spectral estimation and power spectral density with a nonlinear error-minimization procedure to estimate the frequency components of the road signal, so precise comfort analysis can be executed. The approach is first validated on a controlled synthetic signal built from 15 sinusoids with predefined frequency, amplitude and damping values in different windows over a 10 s signal. In the synthetic validation case, the method recovered the imposed components with frequency errors below 0.5%, amplitude errors below 8%, damping errors within 5%, a mean absolute window-wise VDV error of 1.7%, and a maximum absolute VDV discrepancy of 5.8% across the nine analysis windows. These low errors indicate that the reconstructed signal preserves the event severity, supporting practical comfort comparison between road excitations. The coherence between original and reconstructed signals supports the reconstruction accuracy, with a minimum mean coherence of 0.91, while time-frequency trends are visualized with Campbell diagrams to track natural frequencies emerging within windows. Then, the proven methodology is applied to three non-stationary real world road measurements obtained from experiments. Based on the identified components, ride-comfort metrics are computed following ISO 2631-1. The resulting reconstruction-based representation of transient components enables comfort studies for virtual development of automotive systems under realistic time-varying excitations.
The role of listening-based government communication in developing collaborative governance: a case study in the Basque Country
(Polish Communication Association, 2026-08-17) Muñoa Errasti, Ion
; Barandiarán Irastorza, Xabier
; Canel Crespo, María José
; Macnamara, Jim
This study introduces a novel link between organizational listening and collaborative governance, reframing government communication as a dynamic driver of democratic engagement. Using an in-depth case study in the Basque Country (Spain), it investigates how structured listening practices within government organizations can foster more effective collaboration with citizens. Thematic analysis of qualitative data from policymakers reveals that active participation in collaborative governance transforms how officials interpret and respond to public feedback, bridging the gap between institutional and citizen perspectives. The research highlights how a shared commitment to listening not only enhances mutual understanding but also encourages adaptive, joint policy development. By situating this inquiry within a real-world collaborative governance initiative, the manuscript offers actionable insights for policymakers aiming to embed meaningful listening at the core of democratic decision-making processes.