For a discussion of my current research efforts, see Research Agenda.
Extraction of friends’ shared tastes from social networks
With Dr. Laura Dietz, I developed a scalable Gibbs sampling framework and implemented and compared several topic models. Furthermore, we demonstrated a substantial improvement in model performance by incorporating friendship network structure.
- L. Dietz, et al. “De-layering social networks by shared tastes of friendships” (published at AAAI Conference for Weblogs and Social Media, 2012).
Alexandru group: Lattice quantum chromodynamics
With Dr. Andrei Alexandru I developed a novel code base to greatly accelerate numerical calculation of lattice quantum chromodynamics. This included,
- Implement a variety of optimized kernels for common linear algebra operations, along with testing framework
- Devise and implement an optimized implementation of the Wilson d-slash operator for nVidia’s Fermi architecture, accomplishing a factor of 30 improvement in per-processor throughput over existing optimized CPU implementations
- Adapt implementation of eigensystem-solver
- Generalize the code-base to operate across a cluster of GPUs
- A. Alexandru, et al. “Efficient implementation of the overlap operator on multi-GPUs” arXiv:1106.4964 (published at Symposium on Application Accelerators in High Performance Computing, 2011)
- A. Alexandru, et al. “Multi-mass solvers for lattice QCD on GPUs” arXiv:1103.5103 (published in the Journal of Computation Physics)
Reeves group: Ablation-aided spectroscopy
- Development and optimization of protocols for near-field tip production from chalcogenide fiber
- Characterization and optimization of atomic force microscope behavior while measuring soft media
- Integration of a variety of laboratory equipment for positioning, mass spectroscopy, and laser excitation.
- D. Raghu, et al. “Near-field ablation threshold of cellular samples at mid-IR wavelengths” arXiv:1201.4980 (published in Applied Physics Letters).
- J. Hoffmann, et al. “Tip preparation for near-field ablation at mid-infrared wavelengths” (to be published in Reviews of Scientific Instrumentation).