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SUNMONTUEWEDTHUFRISAT
Events for May 02, 2006
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Stop Period
Tue, May 02, 2006
Viterbi School of Engineering Student Affairs
University Calendar
Audiences: Undergrad/Graduate Students
Contact: Monica De Los Santos
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Computational geomechanics across different scales
Tue, May 02, 2006 @ 11:00 AM - 11:50 AM
Sonny Astani Department of Civil and Environmental Engineering
Conferences, Lectures, & Seminars
Speaker:Ronaldo I. Borja
Department of Civil and Environmental Engineering
Stanford UniversityAbstract
In this seminar I will present the ongoing research work at Stanford University in the area of computational geomechanics spanning different scales. Research currently being undertaken in computational geomechanics dealing with kilometre-scale problems includes numerical simulation of folding and fracturing of sedimentary rock strata using combined elastoplastic-damage continuum theory along with enhanced finite element methods, and simulation of regional-scale fault nucleation and propagation using a finite deformation stick-slip law with a variable coefficient of friction. Research dealing with millimetre-to-meter scale problems focuses on quantifying the effect of spatial density variation on the localization properties of dense sands using a continuum meso-scale simulation technique. Research dealing with micron-scale problems includes theoretical and numerical investigation into the micromechanics of porous media through Lattice-Boltzmann simulations of fluid flow hydrodynamics in porous sandstones. Measurement and calibration are key to a successful development of computational algorithms and numerical models at different scales. LiDAR technology, including laser scanning, GPS, and digital imagery provides high-resolution topographic data to constrain kilometre-scale fold models and decametre-long, centimetre-thickness fractures. At the other end of the spectrum lie the advances of 3D digital imaging of lab specimens using X-Ray computed tomography with micron-scale resolution. Combined with traditional testing of centimetre- and metre-scale lab specimens, I will describe how our numerical models can reach a level of mathematical sophistication commensurate with our ability to measure the relevant response variables.Location: Kaprielian Hall (KAP) - rielian Hall, Room 203
Audiences: Everyone Is Invited
Contact: Evangeline Reyes
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Joint Source-Channel Coding in Gaussian Fading Channels
Tue, May 02, 2006 @ 03:30 PM - 04:30 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Prof. Giuseppe CaireAbstract: Multicasting a common "analog" source over a wireless channel to a large number of users is still the main application of wireless communications. Analog FM for audio, AM-SSB for TV, DTV and DAB are practical example of this problem. Shannon's separation theorem has driven the design of today's digital multicasting systems. Unfortunately, separate design and operations of source compression and channel coding might put unnecessarily tight constraints on the channel post-decoding error probability. These constraints require practical systems to back off from the theoretical limits. Furthermore, when multicasting to a large set of users in different (fading) channel conditions, the sharp threshold effect of digital systems designed according to the separation principle is not desirable. On the contrary, a "graceful degradation" effect that emulates the behavior of analog systems is more suited for this scenario.In this talk, I shall present some recent advances in Joint Source Channel Coding applied to the wireless channel. The talk is aimed at presenting on-going work, in an informal and hopefully stimulating format.
Location: Hughes Aircraft Electrical Engineering Center (EEB) - -248
Audiences: Everyone Is Invited
Contact: Mayumi Thrasher
