A5035570288- Seismic Imaging and Inversion Techniques
- Ultrasonics and Acoustic Wave Propagation
- Matrix Theory and Algorithms
- Ultrasound Imaging and Elastography
- Statistical and numerical algorithms
- Numerical methods in inverse problems
- Electromagnetic Simulation and Numerical Methods
- Radiative Heat Transfer Studies
- Spectroscopy and Chemometric Analyses
- Probabilistic and Robust Engineering Design
- Coding theory and cryptography
- Advanced X-ray Imaging Techniques
- Scientific Computing and Data Management
- Blind Source Separation Techniques
- Image and Signal Denoising Methods
- Distributed and Parallel Computing Systems
- graph theory and CDMA systems
- Environmental Monitoring and Data Management
- Nonlinear Photonic Systems
- Nonlinear Waves and Solitons
- Medical Imaging Techniques and Applications
Center for Advanced Studies Research and Development in Sardinia
2009-2023
Sardegna Ricerche (Italy)
2009
University of Cagliari
2003-2007
We devised a data‐driven strategy for the simultaneous estimate of eight CRS traveltime attributes, solving global non‐linear minimization problem without need computing gradients. The essential elements are following: conjugate‐direction method supported by well known convergence properties and an iterative line‐search implementing strong Wolfe‐Powell rule control steplength. resulting algorithm can reach very good solutions in presence many local minima.
Although time-domain depth migration techniques have been successfully ported to run on modern hardware accelerators, their ultimate obstacle is the I/O overhead present during imaging step. Frequency-domain algorithms overcome this limitation and can exploit full potential of new computing technologies. In particular, our implementation Phase Shift Plus Interpolation (PSPI) method characterized by fast running time, good quality results under low signal-to-noise ratio conditions excellent...
Medical ultrasound usually implements ray-based imaging algorithms, in which the most severe limitation involves implicit assumption of constant-velocity media. When there are tissues with different velocities---typical for human body---, image underlying targets is strongly degraded placement and resolution, due to $p\phantom{\rule{0}{0ex}}h\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}s\phantom{\rule{0}{0ex}}e$...
Abstract This study presents the application to medical ultrasonography of a high value-added imaging method developed in context geophysical exploration and based on undulatory description physical process. Currently, most serious limitation conventional ultrasound systems is implicit assumption constant-velocity media stemming from widespread use geometrical ray-based algorithms leading phase aberration phenomena case typical human body two or more tissues with different velocities. As...
GRIDA3 (Shared Resources Manager for Environmental Data Analysis and Applications) is a multidisciplinary project designed to deliver an integrated system forge solutions some environmental challenges such as the constant increase of polluted sites, sustainability natural resources usage forecast extreme meteorological events. The portal mainly based on Web 2.0 technologies EnginFrame framework. portal, now at advanced stage development, provides end-users with intuitive Web-interfaces tools...
The Spectral Element Method (SEM), widely used in engineering sciences but almost unknown Oil&Gas exploration, is a numerical technique for large scale and multi-physics simulations. SEM an h-p approximation of the problem solution that allows quasi-optimal distribution computational points on unstructured grids so as to reduce both memory usage processing time. Thus, when accuracy mandatory complex 3D geometries, becomes excellent alternative Finite Elements (FE) Differences (FD). Its...