Hun-Sung Kim
Dark Data in Real-World Evidence: Challenges, Implications, and the Imperative of Data Literacy in Medical Research
Journal of Korean medical science
bstract modern seismic recording instruments allow precise measurements amplitude reflected signals intuitively would expect amplitude information could used increase knowledge physical properties reflecting earth relevant factors defining amplitude reflection signal spherical divergence absorption reflection coefficient reflecting interface cumulative transmission loss interfaces effect multiple reflections factors threespherical divergence reflection coefficient transmission lossare reasonably clear concepts though estimation transmission loss acoustic logs caused difficulties heyday synthetic seismograms absorption still presents considerable problems detail understanding increased significantly recent years factor least well understood undoubtedly effect multiple reflections multiple paths even number bounces effect delaying shaping magnifying pulse transmitted layered sequence simple demonstations phenomenon made using elementary thin plates presented various synthetic real sequences layers demonstrations lead one explore relation spectrum transmitted pulse spectrum reflection coefficient series possible isolate amplitude shape variations imposed absorption within layer would chance measure absorption would useful correlatable diagnostic indication rock properties possible isolate amplitude shape variations imposed multiple reflections would chance measure would useful indication cyclic sedimentation dominant durations sedimentary cycles however separation two effects constitutes formidable challenge difficulty separation suggests may opportune review quantitative estimates absorption made field experiments