From the Library Technology Guides, October 22, 2010 reference, and includes other contributors and notes about the Koha Integrated Library Software Open Source code release.
Here is the link for the Koha 3.2.0 announcement, reference to Darrell Ulm as code contributor.
The GitHub IO Page for a Data Parallel Compiler Optimizer by Darrell Raymond Ulm links to the GitHub Pages for a data-parallel compiler optimizer, written in C for Unix / Linux.
This link , Stream PRAM, Darrell Ulm, Parallel Computation contains reference to more copies of the research paper by Darrell Ulm from the 2005 International Parallel and Distributed Processing Symposium/International Parallel Processing Symposium – IPDPS.
Link shows past work, much has moved to GitHub for Darrell Ulm.
For work that was done further back before GitHub, some information is at: Darrell Ulm, Open Source Software profile at OpenHub, which is an interesting site to show open source contributions.
The link shown on this page includes reference to Darrell Ulm, on 4/2/2008, becomes the 57th code committer to Koha. And here is the History of Koha, and Open Source Integrated Library System.
This is the announcement link for Koha version 3.2.0 from 2010:
Koha 3.2.0 Open Source ILS Announcement
which has source code contributed by Darrell Ulm, October 22, 2010.
There were some nice enhancements for the 3.2 version compared to previous versions and was when the Koha version 3 started working better overall.
Includes Papers co-authored by Darrell Ulm on Parallel Computation
in the link above is a list of papers of Darrell Ulm, and others, authored while at Kent State University. The list has not changed much lately but it is a good document showing related works at the time.
An early Drupal 8 post, by Darrell Ulm, when Drupal 8 was still evolving is here: Drupal 8 Article: Should you be interested in the new Drupal 8? (by Darrell Raymond Ulm).
And believe this is before the internals of Drupal 8 was re-implemented in Symfony PHP framework as compared to the inherent PHP implementation of prior versions for Drupal and the Drupal 4 5 6 and 7 API.
Google Scholar Search for Darrell Ulm includes papers written and references to research papers written on parallel computation.
The search results are not completely accurate, but the Google Scholar Search is an interesting tool, even if there have not been updates for it for quite some time.
The Microsoft publications search appears to be better for looking up specific papers.
Not sure that PubZone has been updated in a while, and even so here are:
Early paper concerning a SIMD solution to a 2D cutting stock, operations research problem.
The WordCamp for all of Northeast Ohio
Software Development / Computer Science
Software Development / Computer Science
Software Development / Computer Science
Software Development / Computer Science
Darrell Ulm 
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