Allen Julie M.

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Allen
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Julie M.
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  • Technical Report
    W.H.O.I. CTD MicroVAX II Data Acquisition System : part I, installation manual
    (Woods Hole Oceanographic Institution, 1992-01) Allen, Julie M.
    AQUI89 is a real-time shipboard Conductivity Temperature Depth profiler (CTD) data acquisition system used at the Woods Hole Oceanographic Institution to collect, preview and store (log) data from the WHOI/Brown Mark III CTD microprofiler on a MicroVAX II computer, running the VAX/VMS operating system, version 5.3. This manual contains the instructions for the installation of the AQUI89 data acquisition system version 1.0.
  • Technical Report
    Calculation of 3-dimensional synthetic seismograms on the connection machine
    (Woods Hole Oceanographic Institution, 1989-10) Allen, Julie M. ; Burns, D. R.
    A three dimensional, second order finite difference method was used to create synthetic seismograms for elastic wave propagation in heterogeneous media. These synthetic seismograms are used to model rough seafloor, the shallow crust, or complex structural and stratigraphic settings with strong lateral heterogeneities. The finite difference method is preferred because it allows models of any complexity to be generated and includes all multiple scattering, wave conversion and diffraction effects. The method uses a fully staggered grid as developed by Virieux (1986). Wavefront snapshots and time series output allow the scattering and focussing of different wave modes with direction to be visualized. The extensive calculations required for realistic size models stretches the resources of serial computers like the VAX 8800. On the Connection Machine, a massively parallel computer, the finite difference grid can be directly mapped onto the virtual processors, reducing the nested time and space loops in the serial code to a single time loop. As a result, the computation time is reduced dramatically.
  • Technical Report
    W.H.O.I. CTD MicroVAX II Data Acquisition System : part II. Operator’s guide
    (Woods Hole Oceanographic Institution, 1992-01) Allen, Julie M.
    AQUI89 is a real-time shipboard Conductivity Temperature Depth profiler (CTD) data acquisition system used at the Woods Hole Oceanographic Institution to collect, preview and store (log) data from the WHOI/Brown Mark III CTD microprofiler on a MicroVAX II computer, running the VAX/VMS operating system, version 5.3. This manual contains the instructions for operation of the AQUI89 data acquisition system version 1.0.
  • Technical Report
    Benchmarking the two-dimensional finite difference synthetic seismogram code
    (Woods Hole Oceanographic Institution, 1991-09) Allen, Julie M. ; Stephen, Ralph A.
    During the past six months, the two-dimensional finite difference synthetic seismogram code was installed and run on a number of different computer systems. The results were compared for timing, accuracy and the ease with which the code was adapted to each system. This report documents the software modifications and the method used to implement the finite difference code on each computer, and presents the results of the benchmark survey.