A Volunteer Computing Project for Solving Geoacoustic Inversion Problems

Solving Weakened Cryptanalysis Problems for the Bivium Keystream Generator in the Volunteer Computing Project SAT@home

In this paper, a cryptanalysis of the Bivium keystream generator in the SAT form is considered. For encoding the initial cryptanalysis problem into SAT a special program system TRANSALG was used. For an obtained SAT instance we use Monte Carlo method to search for a partitioning with good time estimation. Several weakened cryptanalysis instances of the Bivium generator were successfully solved ...

Neural Direct Approaches for Geoacoustic Inversion

Broadband synthetic aperture geoacoustic inversion.

A typical geoacoustic inversion procedure involves powerful source transmissions received on a large-aperture receiver array. A more practical approach is to use a single moving source and/or receiver in a low signal to noise ratio (SNR) setting. This paper uses single-receiver, broadband, frequency coherent matched-field inversion and exploits coherently repeated transmissions to improve estim...

Low Frequency Geoacoustic Inversion Method

APPROACH Consider the simulated SW06 scenario with a “true” bottom consisting of 3 sediment layers (to­ taling 22m in depth extent – a medium thickness) where all three sediment layers are each defined by a linear sound-speed profile (and constant densities) all over a half-space (constant sound-speed and density) as seen in Fig. 1. For the inversion processing we shall (as in earlier work) ass...

Geoacoustic Inversion in Shallow Water

The ability to predict the sound field in shallow water envirnments depends to a large degree on having adequate knowledge of the geoacoustic properties of the bottom. The long term objectives of this research project are related to the investigation of experimental methods and inversion techniques for estimating parameters of geoacoustic models of the ocean bottom and the associated uncertaint...