Michael McLennan

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The HUBzero cyberinfrastructure lets scientific researchers work together online to develop simulation and modeling tools. Other researchers can then access the resulting tools using an ordinary Web browser and launch simulation runs on the national Grid infrastructure, without having to download or compile any code.
In 2002, the National Science Foundation established the Network for Computational Nanotechnology (NCN), a network of universities supporting the National Nanotechnology Initiative by bringing computational tools online, making the tools easy to use, and supporting the tools with educational materials. Along the way, NCN created a unique cyberinfrastructure(More)
Scientific workflow managers are powerful tools for handling large computational tasks. Domain scientists find it difficult to create new workflows, so many tasks that could benefit from workflow automation are often avoided or done by hand. Two technologies have come together to bring the benefits of workflow to the masses. The Pegasus Workflow Management(More)
The Network for computational nanotechnology (NCN) has developed a science gateway at nanoHUB.org for nanotechnology education and research. Remote users can browse through online seminars and courses, and launch sophisticated nanotechnology simulation tools, all within their Web browser. Simulations are supported by a middleware that can route complex jobs(More)
A realistic 40 nm InAs high electron mobility transistor is studied using a two-dimensional, full-band, and atomistic Schrödinger-Poisson solver based on the spds tightbinding model. Bandstructure non-parabolicity effects, strain, alloy disorder in the InGaAs and InAlAs barriers, as well as band-to-band tunneling in the transistor OFF-state are(More)
In this paper, we described the benefits and the challenges of integrating existing scientific workflow technologies into science gateways. Scientific workflow managers are powerful tools for handling large computational tasks. Domain scientists find it difficult to create new workflows, so many tasks that could benefit from workflow automation are often(More)
nanoHUB.org provides a community service to over 65,000 users in over 172 countries annually with " online simulations and and more ". Over 85 interactive simulation tools supported by tutorials and general nanotechnology information material are available free of charge to anybody. In all there are over 1,000 resources on nanoHUB. Usage in over 30 classes(More)
The Network for Computational Nanotechnology Cyberinfrastructure Node (NCN CI) is responsible for the operation and support of the cyber-platform nanoHUB.org, serving a large scientific community centered around the nanoscience and nanotechnology fields. The word “community” is constantly on our minds. One definition of community is a “body of persons of(More)
Software is increasingly important to the scientific enterprise and science funding agencies are increasingly funding software work. Accordingly many different participants need insight into how to understand the relationship between software, its development, its use, and its scientific impact. In this paper we draw on interviews and participant(More)