Focus Area • Uncertainty Quantification (UQ) is a growing area of importance for quantifying confidence in computational engineering simulations. Our activities in this area include fundamental algorithm research, implementation of those algorithms into our flagship software tools DAKOTA (http://dakota.sandia.gov) and Trilinos (http://trilinos.sandia.gov), and deployment of those tools to mission-critical application teams within Sandia...

# Search

## Uncertainty Quantification Challenges in High-Performance Scientific Computing

Award, April 3, 2014 • Other external recognition, SIAM Conference on Uncertainty Quantification. Mini-tutorial

## Unveiling the Interplay Between Global Link Arrangements and Network Management Algorithms on Dragonfly Networks

Award, August 3, 2017 • Invited Talk, Fourth Workshop on Programming Abstractions for Data Locality (PADAL).

## US Frontiers of Engineering Symposium Invitee

Award, September 25, 2017 – September 27, 2017 • Other external recognition, National Academy of Engineering. Nominated to be one of ~100 young engineers to participate in a multi-day symposium on emerging topics in engineering. https://www.naefrontiers.org/Symposia/USFOE/USFOE-PastSymposia/54726.aspx

## USACM Thematic Workshop on Uncertainty Quantification and Data-Driven Modeling

News Article, May 1, 2017 • The U.S. Association for Computational Mechanics (USACM) Thematic Workshop on Uncertainty Quantification and Data-Driven Modeling was held on March 23-24, 2017, in Austin, TX. The organizers of the technical program were James R. Stewart of Sandia National Laboratories and Krishna Garikipati of University of Michigan. The organization was coordinated through the...

## V. Gregory Weirs

Staff Page • Computational Science. Biography I am a Senior Member of the Technical Staff in the Computational Science Department. My expertise by training is computational fluid dynamics for compressible reacting flows, and these remain at the core of my recent projects. At Sandia I have also focused on verification and validation (V&V)...

## Vanguard

Project • The Vanguard project is expanding the high-performance computing ecosystem by evaluting and accelerating the development of emerging technologies in order to increase their viability for future large-scale production platforms. The goal of the project is to reduce the risk in deploying unproven technologies by identifying gaps in the hardware and software...

## Verification and Validation

Focus Area • Verification and Validation (V&V) are important technologies for enabling a science-basis for computational engineering predictions. Our activities include development of new methodologies and workflows for code verification, solution verification, and validation, in support of engineering analysis. This work requires close partnership with other Sandia organizations. We also work across organizations...

## Virtual Machine Support for the Cray XC

News Article, August 1, 2017 • Researchers at Sandia National Laboratories have demonstrated for the first time the ability to deploy general purpose virtual machines on a Cray XC series supercomputer. Various high-performance computing and data intensive workloads exhibited near native levels of efficiency and scalability. This effort lays the groundwork for supporting coupled simulation and...

## Vitus J. Leung

Staff Page • Discrete Math & Optimization. Biography Research Interests: On-line Algorithms Computational Complexity Analysis of Algorithms Graph Theory Combinatorics Publications

## VTK-m

Software • One of the biggest recent changes in high-performance computing is the increasing use of accelerators. Accelerators contain processing cores that independently are inferior to a core in a typical CPU, but these cores are replicated and grouped such that their aggregate execution provides a very high computation rate at a...

## Warren Davis Earns National Honors in Leadership and Technology

News Article, February 1, 2019 • Warren Davis, received his award during the conference in Washington, D.C., Feb. 7-9, 2019. The annual meeting recognizes black scientists and engineers and is a program of the national Career Communications Group, which advocates for corporate diversity. This scientist wants to help you see like a computer. If you saw all...

## Wayne Witzel

Staff Page • Quantum Computer Science. Biography My primary research is in quantum information. I have pioneered cluster expansion methods for calculating the decoherence rate of a spin qubit in the presence of impurity nuclear and electron spins. I've also studied dynamical decoupling strategies in this context. I've broadened my research into more...

## William Chapman

Staff Page • Postdoctoral Appointee. Biography William is a postdoctoral fellow at Sandia, since Spring 2023. His primary research interests lie in utilizing biological inspiration from neuroscience for Neuromorphic algorithm development. Prior to joining Sandia William completed his Ph.D in computational neuroscience, creating detailed biological models of local learning rules for time series...

## William Mark Severa

Staff Page • Biography William is a mathematician and researcher specializing in deep learning, spiking neural networks, and neuromorphic computing. After receiving his Ph.D. in mathematics from the University of Florida, he joined Sandia in 2015 and his research has demonstrated the practicality and effectiveness of utilizing neural network architectures in real-world scenarios,...

## Workshop on Advanced Computational Engineering, Oberwolfach, Germany

Award, February 1, 2012 • Invited Talk, MFO.

## Workshop on Mathematical Theory and Computational Methods for Multiscale Problems

Award, January 21, 2012 • Invited Talk, National University of Singapore.

## XPRESS – eXascale Programming Environment and System Software

Project • The XPRESS Project was one of four major projects of the DOE Office of Science Advanced Scientific Computing Research X-stack Program initiated in September, 2012. The purpose of XPRESS was to devise an innovative system software stack to enable practical and useful exascale computing around the end of the decade with near-term...

## XVis

Project • The XVis project brings together the key elements of research to enable scientific discovery at extreme scale. Scientific computing will no longer be purely about how fast computations can be performed. Energy constraints, processor changes, and I/O limitations necessitate significant changes in both the software applications used in scientific computation...

## Zachary Morrow (Zack)

Staff Page • Scientific Machine Learning. Biography Zack's research interests lie at the intersection of approximation theory and scientific computing, with applications ranging from computational chemistry to wildfire simulation. He joined Sandia in 2021. Education Ph.D., Applied Mathematics, North Carolina State University (2021)Advisor: C. T. KelleyConcentrations in Computational and Interdisciplinary MathematicsM.S., Applied Mathematics,...

## Zoltan

Software • Zoltan is a toolkit of parallel algorithms for dynamic load balancing, geometric and hypergraph-based partitioning, graph coloring, matrix ordering, and distributed directories. Zoltan is open-source software, distributed both as part of the Trilinos solver framework and as a stand-alone toolkit.

## Zoltan

Project • The Zoltan project focuses on parallel algorithms for parallel combinatorial scientific computing, including partitioning, load balancing, task placement, graph coloring, matrix ordering, distributed data directories, and unstructured communication plans. The Zoltan toolkit is an open-source library of MPI-based distributed memory algorithms. It includes geometric and hypergraph partitioners, global graph coloring,...

## Zoltan2: Exploiting Geometric Partitioning in Task Mapping for Parallel Computers

Award, April 29, 2014 • Invited Talk, PADAL Workshop 2014.

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