CRS4 Tesi

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https://hdl.handle.net/11050/61

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  • Immagine di anteprima
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    Gvol: software libero per la manipolazione e visualizzazione di dati volumetrici
    (2003-07) Scalas, Alceste; Pili, Piero; Scateni, Riccardo
    La rapresentazione volumetrica e' un importante schema di rappresentazione di modelli geometrici solidi. Questo lavoro illustra l'analisi e lo sviluppo di una libreria di componenti per la rappresentazione e la visualizzazione di dati volumetrici, chiamata GVol, orientata alla prototipazione rapida di applicazioni software general-purpose e all'ottimizzazione delle loro prestazioni. I settori applicativi di riferimento sono l'analisi e non distruttiva di materiali e le applicazione nel settore bio-medicale.
  • Immagine di anteprima
    Item
    Haptic and visual simulation of bone dissection
    (2004-03) Agus, Marco; Picasso, Bruno; Zanetti, Gianluigi; Gobbetti, Enrico
    In bone dissection virtual simulation, force restitution represents the key to realistically mimicking a patient--specific operating environment. The force is rendered using haptic devices controlled by parametrized mathematical models that represent the bone--burr contact. This dissertation presents and discusses a haptic simulation of a bone cutting burr, that it is being developed as a component of a training system for temporal bone surgery. A physically based model was used to describe the burr--bone interaction, including haptic forces evaluation, bone erosion process and resulting debris. The model was experimentally validated and calibrated by employing a custom experimental set--up consisting of a force--controlled robot arm holding a high--speed rotating tool and a contact force measuring apparatus. Psychophysical testing was also carried out to assess individual reaction to the haptic environment. The results suggest that the simulator is capable of rendering the basic material differences required for bone burring tasks. The current implementation, directly operating on a voxel discretization of patient-specific 3D CT and MR imaging data, is efficient enough to provide real--time haptic and visual feedback on a low--end multi--processing PC platform
  • Immagine di anteprima
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    Risk analysis and mitigation of seawater intrusion for the Gaza strip coastal aquifer under climate induced changes
    (2013-03-15) Dentoni, Marta; Deidda, Roberto; Lecca, Giuditta; Paniconi, Claudio
    Coastal aquifers are in hydraulic contact with the sea; prolonged overpumping of groundwater can lead to inland encroachment and/or vertical up-coning of the interface (transition or mixing zone) between these regimes, causing salt contamination of freshwater aquifers. In the Mediterranean area, seawater intrusion (SWI) has sometimes become a major threat to coastal area freshwater resources, mainly due to lack of appropriate groundwater resources management. Current projections of future potential climatic scenarios further complicate the overview, because the worst considered possibilities provide critical predictions about the decline of the average amount of water available (in terms of both inflows and outflows); furthermore, the projected sea-level rise (SLR) could significantly alter the position and morphology of coastline. A proper analysis and risk assessment of areas subject to SWI, and the evaluation of the coastal basins hydrological response to climate variability, appear to be essential for the design of water management measures that are necessary to mitigate environmental and socio-economic impacts. The key objectives of the study are: 1) development of a methodology of SWI risk analysis in coastal aquifers; 2) application of the methodology to a real case-study (Gaza Strip coastal aquifer, Palestinian Territories) to assess the risk of saltwater ingression and 3) analysis of the effectiveness of mitigation strategies on SWI Risk to support the planning of future spatial and territorial organization. The aquifer system is studied with a simulation code to assess the feasibility of risk mitigation measures under climate induced changes, by the means of simulation/optimization methods, which can provide the quantitative information needed for the management of groundwater resources, with respect to assigned objectives and constraints. Results show that (i) SWI risk assessment can be addressed by means of groundwater simulation models, calibrated against field measures, as a tool to evaluate future contamination in response to projected climate scenarios and exploitation plans, and that (ii) mitigation measures can be developed, according to some predefined criteria, and expected benefits can be quantified. The research is carried out within the CLIMB project, funded by the 7th Framework Programme of the European Commission.
  • Immagine di anteprima
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    Studio del comportamento idroelastico di contenitori galleggianti
    (2000-05) Lodes, Ilaria; Fotia, Giorgio; Landrini, Maurizio
    Il progetto di tesi svolto durante lo stage conclusivo del “Master in Tecniche informatiche avanzate per la progettazione e la simulazione numerica” si proponeva di studiare il comportamento idroelastico delle strutture galleggianti.