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We present the detailed planning and execution of the Insight Toolkit (ITK), an application programmers interface (API) for the segmentation and registration of medical image data. This public resource has been developed through the NLM Visible Human Project, and is in beta test as an open-source software offering under cost-free licensing. The toolkit(More)
Sustainable software ecosystems are difficult to build, and require concerted effort, community norms and collaborations. In science it is especially important to establish communities in which faculty, staff, students and open-source professionals work together and treat software as a first-class product of scientific investigation-just as mathematics is(More)
We observed the same task executed by 49 users on four production web sites. We tracked the rates of discovery of new usability problems on each site and, using that data, estimated the total number of usability problems on each site and the number of tests we would need to discover every problem. Our findings differ sharply from rules-of-thumb derived from(More)
A significant unsolved problem in scientific visualization is how to efficiently visualize extremely large time-varying datasets. Using parallelism provides a promising solution. One drawback of this approach is the high overhead and specialized knowledge often required to create parallel visualization programs. In this paper, we present a parallel(More)
The DOE leadership facilities were established in 2004 to provide scientist capability computing for high-profile science. Since it's inception, the systems went from 14 TF to 1.8 PF, an increase of 100 in 5 years, and will increase by another factor of 100 in 5 more years. This growth, along with user policies, which enable scientist to run at, scale for(More)
The ideas and findings in this report should not be construed as an official DoD position. It is published in the interest of scientific and technical information exchange. Use of any trademarks in this report is not intended in any way to infringe on the rights of the trademark holder. Internal use. Permission to reproduce this document and to prepare(More)
This tutorial is inspired by our observations of users struggling with web sites and our consulting work with clients who face the many challenges of web site development. We've witnessed the effects of less-than-optimal web site design and the pain it causes users. Our client work and research have given us insights into the <i>causes</i> of unusable(More)