TECNALIA Publications

Welcome to TECNALIA Publications, the Institutional Repository of Fundación TECNALIA Research & Innovation. TECNALIA Publications' main objective is to collect, preserve and disseminate the intellectual production resulting from the research activity of TECNALIA to generate transferable knowledge and contribute thereby to development and social progress.

 

Recent Submissions

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SOAM: An environment adaptation model for the pervasive Semantic Web
(2006) Vazquez, Juan Ignacio; De Ipiña, Diego López; Sedano, Iñigo; FACTORY
Nowadays, there is a major interest in applying Web and Semantic Web techniques for the creation of pervasive computing scenarios, where devices and objects communicate using these technologies. The Web model has largely proved validity both in Internet-wide and intranet scenarios, but it is starting to be applied in personal area networks as a communication and knowledge reasoning system. In this paper we present SOAM, an experimental model for the creation of pervasive smart objects that use Web and Semantic Web technologies in new ways - resulting in the novel concept of Pervasive Semantic Web - for enabling personal area semantic communication and reasoning processes in order to provide environment adaptation to user preferences.
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Standardized toolchain and model development for video quality assessment - The mission of the Joint Effort Group in VQEG
(IEEE Computer Society, 2011) Staelens, Nicolas; Sedano, Iñigo; Barkowsky, Marcus; Janowski, Lucjan; Brunnström, Kjell; Le Callet, Patrick; FACTORY
Since 1997, the Video Quality Experts Group (VQEG) has been active in the field of subjective and objective video quality assessment. The group has validated competitive quality metrics throughout several projects. Each of these projects requires mandatory actions such as creating a testplan and obtaining databases consisting of degraded video sequences with corresponding subjective quality ratings. Recently, VQEG started a new open initiative, the Joint Effort Group (JEG), for encouraging joint collaboration on all mandatory actions needed to validate video quality metrics. Within the JEG, effort is made to advance the field of both subjective and objective video quality measurement by providing proper software tools and subjective databases to the community. One of the subprojects of the JEG is the joint development of a hybrid H.264/AVC objective quality metric. In this paper, we introduce the JEG and provide an overview of the different ongoing activities within this newly started group.
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Evaluation of the Specific Capacitance of High-Entropy Oxide-Based Electrode Materials in View of Their Use for Water Desalination via Capacitive Method
(Multidisciplinary Digital Publishing Institute (MDPI), 2023-01-04) Triolo, Claudia; Santangelo, Saveria; Petrovičovà, Beatrix; Musolino, Maria Grazia; Rincón, Inés; Atxirika, Ainhoa; Gil, Silvia; Belaustegui, Yolanda
Water pollution and scarcity are serious concerns for the growing world population. To meet the ever-pressing demand of fresh water, a variety of desalting techniques of seawater have been developed. Due to its environmental friendliness, high efficiency, easy regeneration of the electrodes, ambient operating pressure, and low operating potential suitable for the use in remote areas, the capacitive deionization (CDI) method is one of the most sustainable among them. This work focuses on the preparation of high-entropy oxides (HEOs) and carbon/HEO composites and the evaluation of their specific capacitance in view of their possible use as CDI electrode materials. CrMnFeCoNi-HEO, having spinel structure (sHEO), is obtained in the form of nanoparticles (NPs) and nanofibers (NFs) by the sol–gel method and electrospinning, respectively. Composite NFs with embedded sHEO NPs or MgCoNiCuZn-HEO NPs with rock-salt structure (rHEO) are also produced. In the 5–100 mV s−1 scan rate range, the specific capacitance improves in the order C/rHEO NFs (8–32 F g−1) ≅ sHEO NPs (9–32 F g−1) < sHEO NFs (8–43 F g−1) < C/sHEO NFs (12–66 F g−1). The highest capacitance is obtained when the beneficial contributions of the carbon matrix and smaller-sized HEO NPs are synergistically coupled.
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Novel Assessment Methodology for Laser Metal Deposition of New Metallic Alloys
(Multidisciplinary Digital Publishing Institute (MDPI), 2023-01-09) Cearsolo, Xabier; Arrue, Mario; Gabilondo, Maitane; Sanchez, Jon Mikel; Galarraga, Haize; Garcia de Cortazar, Maider; Girot Mata, Franck
Metal additive manufacturing technologies are gaining great interest. However, the existing metallic alloys are generally formulated for conventional manufacturing processes. Thus, it is necessary to adapt their chemical composition or develop new alloys for the manufacturing conditions of additive manufacturing processes. The main method for manufacturing metal powder is gas atomization, but it is very expensive with long manufacturing times. Therefore, it is necessary to develop alloy validation methods that simplify the development process of new alloys. This paper deals with a methodology based on thermodynamic heat transfer equations, simulation, and powderless tests. This novel methodology enabled the determination of the optimal conditions for the laser melting deposition process of the commercial AA7075 alloy with a reduced number of experimental tests with powder, reducing the difficulties inherent to powder processing. The developed process was divided into two stages. In the first stage, the heating of the substrate was studied. In the second stage, the depositions of single tracks were validated with the parameters extrapolated from the previous stage. Hence, it was possible to manufacture single tracks free of cracks with an adequate aspect ratio.
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Security Architecture for Swarms of Autonomous Vehicles in Smart Farming
(MDPI, 2021-05-11) Martinez-Rodriguez, Belen; Bilbao-Arechabala, Sonia; Jorge-Hernandez, Fernando
Nowadays, autonomous vehicles are incorporated into farms to facilitate manual labour. Being connected vehicles, as IoT systems, they are susceptible to cyber security attacks that try to cause damage to hardware, software or even living beings. Therefore, it is important to provide sufficient security mechanisms to protect both the communications and the data, mitigating any possible risk or harm to farmers, livestock or crops. Technology providers are aware of the importance of ensuring security, and more and more secure solutions can be found on the market today. However, generally, these particular solutions are not sufficient when they are part of complex hybrid systems, since there is no single global solution proposal. In addition, as the number of technologies and protocols used increases, the number of security threats also increases. This article presents a cyber-security architecture proposal for swarms of heterogeneous vehicles in smart farming, which covers all of the aspects recommended by the ISO 7798-2 specification in terms of security. As a result of this analysis, a detailed summary of the possible solutions and available technologies for each of the communication channels of the target system as well as some recommendations are presented.
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Effect of high‐density current electropulsing on corrosion cracking of titanium aluminide intermetallic
(Wiley-VCH Verlag, 2021) Babutskyi, Anatolii; Chrysanthou, Andreas; Chyzhyk, Ganna; Cortázar, Maider García; Egizabal, Pedro; Smelina, Marija
The effect of electropulsing on the corrosion cracking of titanium aluminide produced by self‐propagating high‐temperature synthesis has been investigated. The electropulsing treatment led to improved corrosion resistance in sodium fluoride solution and also eliminated corrosion cracking at the α2/γ interface during corrosion in a solution of nitric and hydrofluoric acids. This behavior was attributed to thermal and athermal effects resulting from electropulsing and leading to the interaction of conduction electrons with the defect structure. The effect of magnetic field accompanying electropusling on depinning of dislocations also has been discussed. Support for this is provided on the basis of X‐ray diffraction analysis and microhardness testing.
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Morteros de albañilería elaborados con áridos reciclados mixtos y escoria blanca
(Federacion de Asociaciones de Ingenieros Industriales de Espana, 2020-01) Soler-Mendoza, Yosniel; Sosa-Gutierrez, Amaury; Tourón-Alonso, Geyne; Arribas-García, Idoia
The objective of this paper is to study the effect of the partial substitution of the most used natural aggregates in the western region of Cuba, specifically in Havana, by mixed recycled aggregates and the total substitution of the natural filler, lime hydrate, by ladle furnace slag, in the elaboration of recycled masonry mortars. The properties provided by recycled mortars are compared to those offered by a standard mortar, made with natural sand and natural filler, and with standard regulation these products at Cuba. The results achieved are satisfactory, since the mortars made with recycled materials meet the requirements required for masonry mortars type III (suitable laying and coating mortars for use on the ground level).
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Dual-modular architecture for developing and validation of decision and control modules for automated vehicles
(Universitat Politecnica de Valencia, 2020) Lattarulo, R.; Matute, J. A.; Pérez, J.; Gomez Garay, V.
El avance logrado durante las últimas décadas en los sistemas avanzados de asistencia a la conducción (ADAS, Advanced Driver Assistance System) ha posibilitado mejorar múltiples aspectos en los vehículos comerciales, como por ejemplo la seguridad, robustez de los sistemas, eficiencia energética, detección de peatones, aparcamiento asistido y ayudas a la navegación, entre otros. Algunos desarrollos, como el control lateral y la generación óptima de trayectorias en tiempo real, están en pleno desarrollo. En este trabajo se presenta una arquitectura dual-modular cuyas principales características son su capacidad para integrar y probar nuevos algoritmos de control y decisión (modular), y la posibilidad de llevar a cabo pruebas en entornos simulados y en plataformas reales (dual), reduciendo los tiempos y costes de desarrollo. Con esta arquitectura se han podido probar diferentes técnicas de control y de generación de trayectorias, realizando además simulaciones, y comparando los resultados obtenidos con un vehículo real.
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Moving towards for Active Role for Smart Grid Users: Study about the perception of smart grids among domestic consumers in Spain (UPGRID project) / Avanzando hacia el rol activo de los usuarios de las smart grids: estudio sobre la percepción de las redes eléctricas inteligentes entre los consumidores domésticos en España (proyecto UPGRID)
(Taylor & Francis, 2020) Herranz-Pascual, Karmele; Garcia-Quincoces, Eduardo; Diez-Gaspon, Itxasne; Bachiller-Prieto, Raúl
Integrating the perspective of smart grid users is the next challenge to be tackled in order to deploy fully the broad technical development of this new generation of electrical grids and improve the efficacy thereof. This is the conclusion reached by the social research developed within the framework of the European UPGRID project. This paper presents the main findings of the Spanish demonstration, working with domestic electricity consumers. The results indicate that these consumers know little about their contract and consumption of electricity, with regard to smart grids. In spite of this, there is some evidence that there is willingness among these consumers to make a change in their energy use towards more environmentally responsible behaviours, a tendency that needs to be developed so that consumers play an active role, which is essential in order to deliver optimal energy supply through smart grids. However, the results must be taken with a degree of caution, since, in spite of the major drive for recruitment, the sample was small and the experimental mortality between phases was high, so the research presented is exploratory in nature.
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Algoritmos de generación de consigna de velocidad angular y ajuste del control de velocidad en aerogeneradores de media potencia
(Universidad del País Vasco, 2017-02-17) González-González, A.; Zulueta Guerrero, Ekaitz
El presente trabajo de tesis está dirigido a la optimización del algoritmo de consigna de velocidad angular del rotor de un aerogenerador de media potencia (100kW). El cálculo de los parámetros integral y proporcional del controlador PI se realiza mediante la técnica de programación de ganancias para seis aproximaciones del modelo de aerogenerador: Método I, II, III, IV, V y VI. Se muestran cuatro estrategias de ajuste de la consigna de velocidad angular del rotor: Constante, convencional, aprendizaje por refuerzo (RL) y optimización metaheurística por enjambre de partículas (PSO). Los métodos y las estrategias se evalúan en base a múltiples objetivos contrapuestos: maximizar la energía captada del viento, minimizar el error de la velocidad angular, minimizar la aceleración angular del rotor y minimizar la velocidad angular del pitch. Por un lado, comparando los métodos, los mejores resultados se obtienen con usando los métodos IV, V y VI. Por otro lado, comparando las estrategias, la estrategia RL no mejora significativamente los resultados en comparación con la estrategia constante y convencional, mientras que la estrategia PSO obtiene los mejores resultados. (c)2017 ASIER GONZALEZ GONZALEZ