We first describe how the Coda distributed filesystem was ported to Windows 95 and 98. Coda consists of user level cache managers and servers and kernel level code for filesystem support. Severe reentrancy difficulties in the Win32 environment on this platform were overcome by extending the DJGPP DOS C compiler package with kernel level support for sockets and more flexible memory management. W...

S U M M A R Y Coda wave interferometry (CWI) utilizes multiply scattered waves to diagnose small changes in a medium by using the scattering medium as an interferometer. Since the medium is usually stationary over the duration of a seismic experiment, different (non-overlapping) time windows in the coda allow for independent estimates of the medium perturbation. If the seismograms are contamina...

seismic waves when crossing the earth in heterogeneous and anisotropic environments, having interaction. recognizing the impact of these factors on the seismograms help us to find out more information about interior of the earth. coda waves are the main reason for the random heterogeneities in earth. local earthquakes in the northeast region of iran with epicentral distance less than 200 km is ...

Empirical Green’s functions (EGFs) between receivers can be obtained from seismic interferometry through cross-correlation of pairs of ground motion records. Full reconstruction of the Green’s function requires diffuse wavefields or a uniform distribution of (noise) sources. In practice, EGFs differ from actual Green’s functions because wavefields are not diffuse and the source-distribution not...

Coda wave interferometry (CWI) has been used to measure the relative wave-velocity change (dV/V) caused by small changes in materials. This study uses stretching processing technique which for CWI analysis investigate velocity of direct longitudinal (P) wave, shear (S) and coda concrete choosing different time windows ultrasonic signals. It is found that obtained depends on window position, bec...

Glottalization of coda /t, p/ is a common process in American English. This study uses acoustic measures to determine when coda glottalization occurs in the conversational speech of the Buckeye Corpus. Vowels preceding coda /t, p/ tokens for 40 speakers were analyzed using H1*–H2*, an acoustic correlate of glottal constriction. Results indicate that coda glottalization is more common before a s...

In earthquake source estimation, coda-derived source methods provide more stable source parameters than methods using direct waves due to the inherent averaging nature of coda waves (Mayeda and Walter, 1996; Mayeda et al., 2007). Unlike conventional direct-phase regional measurements (e.g., Pg or Lg), which take peak amplitude at the specific arrival time, the coda amplitude measurement through...

[1] Unprecedented hydroacoustic observations of the megathrust earthquake of 26 Dec, 2004 were afforded by a network of 5 small hydroacoustic arrays located in the Indian Ocean, at distances of 2800 to 7000 km from the epicenter. Each array recorded acoustic waves, called T waves, generated by this event. Analysis of a series of short time windows within the T wave coda shows that the receiver ...

An advanced distributed file system like Coda is an integral part of today’s mobile environment. This is due to the limitations of having large storage capacities on small mobile devices, finite battery life and the ubiquitous nature of wireless networking today. However, systems such as Coda do not perform optimally on low bandwidth connections such as low-speed error prone wireless links and ...