In characterizing reservoirs, we are often interested in retrieving detailed elastic parameters for only a very limited part of the subsurface. One way of doing so involves studying the seismic reflection response within the region of interest. To that end, we introduce a local solver that uses an acoustic solver to propagate the wavefield to a subdomain on which we use a local elastic solver. ...

Characterizing the elastic properties in deep-buried reservoirs beneath complex overburden structures remains challenging for seismic inversion. Elastic full-waveform inversion (FWI) is capable of quantitatively estimating subsurface with a reasonably high resolution. However, FWI using frequencies computationally expensive because fine discretization required to stabilize wavefield simulation....

The estimation of subsurface properties of the earth by use of observed geophysical data is identified as “geophysical inversion”, and can be defined to include nearly everything that geophysicists do. As we approach the new millennium, it is interesting to contrast past and present inversion methods with possibilities for the future. Although the earliest inversions were done entirely within t...

New generation robots, meant for physical human robot interactions, are no longer rigid; it has become soft in terms of introduction of considerable flexibility at the actuated joints, flexibility of the links and in terms of compliant coverings. Safety requirement becomes primary in situations where physical interactions occur, calling for compliance; but accuracy and control bandwidth get com...

For the recent CMOS feature sizes power dissipation becomes an overriding concerns for VLSI circuit design. We propose a novel approach named tri-state elastic buffer design which reduces the total power, area & delay of elastic buffer. The paper presents a design and implementation of tristate buffer mechanism in 120 nm technology. This design offers also the advantage of third state (High Imp...