Talks and Posters
2011:

A. H. Gebremedhin, D. Nguyen, M.M.A, Patwary and A. Pothen,
The ColPack Software Library for Graph Coloring to Enable Derivative Computations,
7th International Congress on Industrial and Applied Mathematics (ICIAM 2011), Vancouver, BC, Canada, July 1822, 2011.

A. H. Gebremedhin, M.M.A. Patwary and A. Pothen,
Multithreaded Graph Coloring Algorithms for Scientific Computing,
7th International Congress on Industrial and Applied Mathematics (ICIAM 2011), Vancouver, BC, Canada, July 1822, 2011.

M. Halappanavar, U. Catalyurek, J. Feo, A.H. Gebremedhin and A. Pothen,
Multithreaded Algorithms for Graph Coloring,
SIAM Conference on Computational Science and Engineering (CSE11), March 2011, Reno,
Nevada.

A. Gebremedhin,
Graph Coloring Software for Sparse Derivative Computation and Beyond,
SIAM Conference on Computational Science and Engineering (CSE11), March 2011, Reno,
Nevada. (Poster)

A. Gebremedhin,
Multithreaded Graph Coloring Algorithms for Scientific Computing on Manycore Architectures,
Workshop on Manycore and Acceleratorbased High Performance Scientific Computing, International Center for Computational Science (ICCS), January 2011, UC Berkeley/LBNL.
2010:

A. Pothen,
Combinatorial Scientific Computing: Algorithms for Enabling Computational Science,
Woudschoten Conference, October 68, 2010, Germany.

A. Pothen,
Scientific Computing in the Manycore Era: Scaling the Memory Wall,
Woudschoten Conference, October 68, 2010, Germany.

A. Gebremedhin,
Algorithms and Software for Sparse Derivative Computation and Beyond,
LANS Seminar Series, Argonne National Laboratory, Dec 1, 2010, Argonne, IL.

A. Gebremedhin,
Accurate and Efficient Computation of Sparse Derivative Matrices,
Computational Science and Engineering Seminar Series, Purdue University, nov 3, 2010.

A. Gebremedhin,
Graph Coloring Software for Computational Science and Engineering,
Computer Science Research Institute, Sandia National Laboratories, Oct 21, 2010, Albuquerque, NM.

M. Halappanavar, U. Catalyurek, F. Dobrian, A. Gebremedhin and A. Pothen,
Parallel Graph Matching and Coloring for Petascale Scientific Computing,
SIAM Conference on Parallel Processing for Scientific Computing (PP10), February 2010, Seattle.
2009:

D. Bozdag, U. Catalyurek, F. Dobrian, A. Gebremedhin, M. Halappanavar and A. Pothen,
Combinatorial Algorithms Enabling Scientific Computing: Petascale Algorithms for Graph Coloring and Matching,
SuperComputing 2009, Nov 2009, Portland, Oregon (Electronic Poster).

A. Gebremedhin, D. Nguyen and A. Pothen,
Ordering for Coloring and More,
The Fourth SIAM Workshop on
Combinatorial Scientific Computing (CSC09),
October 2009, Monterey, CA.

A. Gebremedhin,
Efficient Computation of Jacobians and Hessians Using
Automatic Differentiation,
PRISM Seminar Series, Birck Nanotechnology Center,
Purdue University, March 13, 2009.

A. Gebremedhin, A. Tarafdar, D. Nguyen and A. Pothen,
ColPack: A Graph Coloring Packager for Sparse Derivative Computation,
SIAM Conference on Computational Science and Engineering, March 26, 2009, Miami, FL..
A talk presented at a minisymposium on automatic differentiation and CSE.

A. Gebremedhin,
The Enabling Power of Graph Coloring Algorithms in Automatic Differentiation,
Dagstuhl Seminar on Combinatorial Scientific Computing, Feb 16, 2009, Germany.
2008:
 The CSCAPES team,
Combinatorial Scientifc Computing and Petascale Simulations Institute (CSCAPES): Recent Progress
SciDAC 2008 Conference, July 2008, Seattle, WA. (Poster)
 A. Gebremedhin,
Graph Coloring in Parallel Processing and Scientic Computing,
CSCAPES Workshop 2008, June 1013, 2008, Santa Fe, NM.

A. Gebremedhin,
Novel Acyclic and Star Coloring Algorithms and Their Application to
Efficient Sparse Hessian Computation via Automatic Differentiation,
SIAM Conference on Optimization, May 1013, 2008, Boston, MA.
Invited talk at a minisymposium on combinatorics in AD.
 A. Gebremedhin,
A Scalable Algorithmic Framework for Parallel Graph Coloring
on Distributed Memory Computers
SIAM Conference on Parallel Processing for Scientific Computing,
March 1214, 2008, Atlanta, GA.
Invited talk at a minisymposium on parallel CSC.
2007:
 P. Hovland and A. Gebremedhin,
Computing Jacobians and Hessians for Nonlinear PDEs,
SciDAC 2007 Conference, June 2007, Boston, MA. (Poster)
 A.H.
Gebremedhin and A. Pothen,
Graph
Coloring for Automatic Differentiation:
A project in the SciDAC Institute
Combinatorial Scientific Computing and Petascale Simulations,
Research Expo 2007, Norfolk, VA, April
2007. (Poster).
 A.H.
Gebremedhin, A. Pothen, A. Tarafdar, F. Manne and A. Walther,
Sparse
Hessian Computation using Automatic Differentiation,
Third SIAM Workshop on Combinatorial
Scientific Computing,
Costa Mesa, CA, Feb 2007.
 A.
Pothen
and A. Gebremedhin,
Graph
Coloring Problems for Computing Derivatives:
Recent Developments and Future Plans,
SIAM Conference on Computational
Science and Engineering,
Costa Mesa, CA, Feb 2007.
 The CSCAPES
team,
Combinatorial
Scientific Computing and Petascale Simulations:
A SciDAC
Applied Math Institute,
SIAM Conference on Computational Science
and Engineering,
Costa Mesa, CA, Feb 2007. (Poster)
2006:
 S. Bhomwick,
E.G. Boman,
K. Devine, A.H. Gebremedhin,
B. Hendrickson, P. Hovland, T. Munson and A. Pothen,
Combinatorial
Algorithms Enabling Computational Science:
Tales from the Front.
SciDAC 2006 Conference, June 2006,
Denver. (Poster)
2005:
 A.H.
Gebremedhin, F.
Manne, A. Pothen and A. Tarafdar,
New
Star and Acyclic Coloring Algorithms (poster).
CSC05  Second Workshop on
Combinatorial Scientific Computing,
June 21  23,
2005, Toulouse,
France.
 A.H.
Gebremedhin, F. Manne, A.
Pothen, A. Tarafdar and R. Aksu,
Graph Coloring
for Computing Derivatives: A
Unifying Framework.
SIAM
Conference on Optimization, May 15  19, 2005, Stockholm, Sweden.
Invited
talk at a minisymposium on Automatic Differentiation.
 A.
Pothen, A.H. Gebremedhin and R. Aksu,
Ordering and
Graph Coloring: An
Experimental Study.
SIAM
Conference on Computational Science and Engineering,
Feb 12 
15, 2005, Orlando, Florida.



