Browsing by Author "Rodríguez, J."
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Item IMA-VR: A multimodal virtual training system for skills transfer in Industrial Maintenance and Assembly tasks(2010) Gutiérrez, T.; Rodríguez, J.; Vélaz, Y.; Casado, S.; Suescun, A.; Sánchez., E. J.; CIRMETAL; PROMETALIndustrial Maintenance and Assembly is a very complex task involving both cognitive skills (procedural skills) and motor skills (fine motor control and bi-manual coordination skills). This paper presents a controlled multimodal training system, for transferring the motor and cognitive skills involved in these tasks. The new platform provides different multimodal aids and learning strategies that help and guide the users during their training process. One of the main features of this system is its flexibility to adapt itself to the task demands and to the users' preferences and needs supporting different configurations. To address bi-manual operations the platform offers different alternatives, one of them is a set-up composed of a haptic device to track the motion of the operator's dominant hand and simulate the physical interaction within the virtual environment, together with a marker-less motion capture system to track the motion of the other hand in real time.Item A model for the C-A-S-H gel formed in alkali-activated slag cements(2011-10-15) Puertas, F.; Palacios, M.; Manzano, H.; Dolado, J. S.; Rico, A.; Rodríguez, J.; Tecnalia Research & InnovationFor first time, an experimental and computational study has been conducted to define a structural model for the C-A-S-H gel forming in alkali-activated slag (AAS) pastes that would account for the mechanical properties of these materials. The study involved a comparison with the C-S-H gel forming in a Portland cement paste. The structure of the C-A-S-H gels in AAS pastes depends on the nature of the alkali activator. When the activator is a NaOH, the structure of the C-S-H gel falls in between tobermorite 1.4. nm with a mean chain length of five, and tobermorite 1.1. nm with a mean length of 14. When waterglass is the activator the structure of the C-A-S-H gel is indicative of the co-existence of tobermorite 1.4. nm with a chain length of 11 and tobermorite 1.1. nm with a chain length of 14. This very densely packed structure gives rise to excellent mechanical properties.