Browsing by Author "Vaquero, C."
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Item A computer-aided decision support system for shoulder pain pathology(Springer Verlag, 2010) López de Ipiña, K.; Hernández, M. C.; Graña, M.; Martínez, E.; Vaquero, C.; Corchado, Emilio; Demazeau, Yves; Pawlewski, Pawel; Corchado, Juan M.; Julián, Vicente; Corchuelo, Rafael; Campbell, Andrew; Fernández-Riverola, Florentino; Dignum, Frank; Bajo, Javier; PRINTEXA musculoskeletal disorder is a condition of the musculoskeletal system which consists in that part of it is injured continuously over time. Shoulder disorders are one of the most common musculoskeletal cases attended in primary health care services. Shoulder disorders cause pain and limit the ability to perform many routine activities and affect about 15-25% of the general population. Several clinical tests have been described to aid diagnosis of shoulder disorders. However, the current literature acknowledges a lack of concordance in clinical assessment, even among musculoskeletal specialists. In this work a Computer-Aided Decision Support (CADS) system for Shoulder Pain Pathology has been developed. The paper presents the medical method and the development of the database and the (CADS) system based on several classical classification paradigms improve by covariance estimation methods. Finally the system was evaluated by a medical specialist.Item Exposure to graphene in a pilot production plant(2019-10-17) Vaquero, C.; Wendelbo, R.; Egizabal, A.; Gutierrez-Cañas, C.; López de Ipiña, J.; PRINTEX; Biomateriales; SMART_MONWorkers exposure to graphene was measured in a pilot production plant. Reduced graphene oxide was produced through graphite oxidation and posterior thermal reduction. The monitoring was performed using two handheld on-line devices covering the particle size range from 10 nm to 10 μm (CPC3007 and OPS3330). Simultaneously, personal and area filter samples were collected for off line analysis, including gravimetric, elemental carbon analysis and SEM/EDX. Significant releases of particles were identified in two tasks, during the graphene oxide washing, and during its milling. However, the analysis of the particles size distribution and of their morphology suggested that the released particles were not the target nanomaterial but engine generated nanoparticles. The mass of elemental carbon in the collected filters was below the quantification limit and the calculated graphene mass concentrations were quite below the selected reference exposure limit. Overall, this work showed that worker exposure to graphene was low in this pilot plant, contributing to guarantee a safe process, prior to its industrialization.Item High velocity spray deposition of WC cermets by an air-oxygen controlled combustion process(ASM International, 2016) Parco, M.; Fagoaga, I.; Barykin, G.; Vaquero, C.; EXTREMATHVOF processes represent the state of art for the spray deposition of wear and corrosion resistant coatings since their supersonic gas velocities in combination with moderate flame temperatures allow the deposition of optimal coatings with very high bond strengths, fine surface finishes and low oxide levels. However, new generation coating materials (fine powders), stringent quality requirements and the high productivity demanded by the industry, push the HVOF technologies to their limits. Recently, a novel air-oxygen controlled high velocity combustion process has been development by Tecnalia. The system operates within the supersonic regime using a broad range of fuel/oxidant ratios thanks to the use of air-oxygen mixtures and a carefully designed gun. Extremely low flame temperatures can be achieved while keeping a supersonic flow of combustion products, thus allowing the solid state deposition of almost all industrially relevant metal alloys with superior deposit qualities. This work deals with the development of superhard cermet coatings using different types of conventional and fine WC-Co(Cr) powders. The process parameters and the system configuration have been optimised looking for the best coating properties and microstructure. Results are compared in terms of ascertained coating properties (microstructure, microhardness and toughness) and the functional performance under sliding wear.Item On the design of a CADS for shoulder pain pathology(2010) De Ipiña, K. López; Hernández, M. C.; Martínez, E.; Vaquero, C.; PRINTEXA musculoskeletal disorder is a condition of the musculoskeletal system, which consists in part of it being injured continuously over time. Shoulder disorders are one of the most common musculoskeletal cases attended in primary health care services. Shoulder disorders cause pain and limit the ability to perform many routine activities, affecting about 15-25 % of the general population. Several clinical tests have been described to aid diagnosis of shoulder disorders. However, the current literature acknowledges a lack of concordance in clinical assessment, even among musculoskeletal specialists. We are working on the design of a Computer-Aided Decision Support (CADS) system for Shoulder Pain Pathology. The paper presents the results of our efforts to build a CADS system testing several classical classification paradigms, feature reduction methods (PCA) and K-means unsupervised clustering. The small database size imposes the use of robust covariance matrix estimation methods to improve the system performance. Finally, the system was evaluated by a medical specialist.Item Polyfire project-an example of an industrial research project promoting safe industrial production of fire-resistant nanocomposites(2011) Vaquero, C.; De Ipĩa, J. López; Galarza, N.; Hargreaves, B.; Weager, B.; Breen, C.; PRINTEX; SMART_MONNew developments based on nanotechnology have to guarantee safe products and processes to be accepted by society. The Polyfire project will develop and scale-up techniques for processing halogen-free, fire-retardant nanocomposite materials and coatings based on unsaturated polyester resins and organoclays. The project includes a work package that will assess the Health and Environmental impacts derived from the manipulation of nanoparticles. This work package includes the following tasks: (1) Identification of Health and Environment Impacts derived from the processes, (2) Experimentation to study specific Nanoparticle Emissions, (3) Development of a Risk Management Methodology for the process, and (4) A Comparison of the Health and Environmental Impact of New and Existing Materials. To date, potential exposure scenarios to nanomaterials have been identified through the development of a Preliminary Hazard Analysis (PHA) of the new production processes. In the next step, these scenarios will be studied and simulated to evaluate potential emissions of nanomaterials. Polyfire is a collaborative European project, funded by the European Commission 7th Framework Programme (Grant Agreement No 229220). It features 11 partners from 5 countries (5 SMEs, 3 research institutes, 2 large companies, 1 association) and runs for three years (1st September 2009 - 31st August 2012). This project is an example of an industrial research development which aims to introduce to the market new products promoting the safe use of nanomaterials.Item Tutor project: An intelligent tutoring system to improve cognitive disabled people integration(2008) Rubio, J.; Vaquero, C.; López De Ipiña, J. M.; Irigoyen, E.; De Ipiña, K. L.; Garay, N.; Conde, A.; Larrañaga, M.; Ezeiza, A.; Soraluze, A.; Peñagarikano, M.; Bordel, G.; Rodríguez, L. J.; López, J. M.; Ezquerra, M.; Oregi, D.; INDUSTRY_THINGS; PRINTEX; SMART_MONNowadays, the integration of people with cognitive disabilities, especially in the work environment in a growing competitive market, is a difficult task. The TUTOR project is addressed to the development and testing of an Intelligent Tutoring System (ITS). The ITS runs on a handheld device and its aim is to increase the autonomy of people with cognitive disabilities in labour and daily life activities, therefore, improving the social and labour integration of this collective and its quality of live. This paper describes the objectives of this project, the methodology followed, some preliminary achieved results and the future planned activities of this research group.Item Understanding the influence of micro- and sub-micro structural features on the mechanical properties of HVO/AF sprayed WC-CoCr cermets(ASM International, 2017) Parco, M.; Fagoaga, I.; Barykin, G.; Vaquero, C.; Chuvilin, A.; EXTREMATHVOF processes represent the state of art for the spray deposition of wear and corrosion resistant coatings since their supersonic gas velocities in combination with moderate flame temperatures allow the deposition of optimal coatings with very high bond strengths, fine surface finishes and low oxide levels. However, new generation coating materials (fine powders), stringent quality requirements and the high productivity demanded by the industry, push the HVOF technologies to their limits. Recently, a novel air-oxygen controlled high velocity combustion process has been development by Tecnalia. The system operates within the supersonic regime using a broad range of fuel/oxidant ratios thanks to the use of air-oxygen mixtures and a carefully optimized gun design. Extremely low flame temperatures can be achieved while keeping a supersonic flow of combustion products, thus allowing the solid state deposition of almost all industrially relevant metal alloys with superior deposit qualities. In this work, a systematic investigation of the influence of the powder particle size and gun configuration on resulting coating microstructural features has been performed. For comparison, two fine structured commercially available WC10Co4Cr powders with different particle size distributions have been investigated. The coating structure has been characterized with by high resolution SEM cross-section imaging and X-ray diffraction analysis. Resulting coatings are characterized by highly dense structures, a high reterion of the primary carbides, average microhardness of up 1885 HV0.3 and fracture toughness varying between 3 and 7 MPa.m-1/2 depending on the powder particle size distribution and the process conditions used.