Josef Sifuentes, Ph.D.

Transcription

1 Josef Sifuentes, Ph.D. TEXAS A&M UNIVERSITY MATH DEPARTMENT - MS 3368 COLLEGE STATION, TX PHONE: (832) josefs@math.tamu.edu URL: josefs EDUCATION AND ACADEMIC EXPERIENCE 2012-Present: Texas A&M University, College Station, TX Visiting Assistant Professor : Courant Institute of Mathematical Sciences, New York University Research Scientist : Rice University, Houston, TX Ph.D. in Computational And Applied Mathematics (CAAM). Thesis Title: Preconditioned Iterative Methods for Inhomogeneous Acoustic Scattering Applications. Advisor: Professor Mark Embree : Rice University, Houston, TX Master of Arts in CAAM. Thesis Title: Preconditioning the Integral Formulation of the Helmholtz Equation via Deflation. Advisor: Professor Mark Embree : Rice University, Houston, TX Bachelor of Arts in Math, CAAM, and Visual Arts RESEARCH Research Interest I am interested in the general area of numerical linear algebra with a specific interest in iterative methods for nonsymmetric linear systems. Currently I am investigating using perturbation theory results to develop convergence bounds for Krylov subspace based methods (e.g. GMRES) applied to approximately preconditioned linear systems. I am also working on using recycled Krylov information within the Arnoldi iteration. My work on Krylov subspace methods stems from developing efficient computational modeling of acoustic and electro-magnetic wave scattering. Medical and seismic imaging, radar, sonar, remote sensing and laser interaction applications motivate the need for efficient simulation of such scattering phenomena. This technology is vital to applications within the Defense, Energy, and Medical Industries. In addition to my investigation of Krylov subspace methods, I am also working on developing efficient quadrature rules for approximating integral formulation evaluations utilized in Fast Multipole Methods. Publications Josef Sifuentes, Mark Embree, and Ron Morgan. The stability of GMRES convergence, with application to preconditioning by approximate deflation. SIAM J. Matrix Anal. Appl., 34(3): , Mark Embree, Josef Sifuentes, Kirk Soodhalter, Daniel Szyld, and Fei Xue. Short-term recurrence Krylov subspace methods for nearly-hermitian matrices. SIAM J. Matrix Anal. Appl., 33(2): , 2012 Josef Sifuentes, Zydrunas Gimbutas, Leslie Greengard. systems To appear in Elec. Trans. on Num. Anal., 2014 Randomized methods for rank-deficient linear Josef Sifuentes, Zydrunas Gimbutas, Leslie Greengard. Optimized quadratures for the Sommerfeld representation of acoustic and electromagnetic fields. In preparation. Gilbert Ymbert, Mark Embree, and Josef Sifuentes. Approximate Murphy-Golub-Wathen preconditioning for saddle point problems. In preparation. Josef Sifuentes, Mark Embree, Shari Moskow. Preconditioning Methods for Thin Scattering Structures Based on Asymptotic Results. In preparation. Josef Sifuentes. Heavy Metal. Mathematical Science and Research Institute Emissary,

2 Josef Sifuentes. Preconditioned Iterative Methods for Inhomogeneous Acoustic Scattering Applications. PhD thesis, Rice University, April Josef Sifuentes. Preconditioning the integral formulation of the Helmholtz equation via deflation. Masters thesis, Rice University, Current Projects I am working with an undergraduate student at Texas A&M on randomized methods for computing null-spaces. Investigating normal completion of Hessenberg matrices with Russell Carden (University of Kentucky) Preconditioning methods for small mesh deformations of wave scattering problems. Developing multi-grid based methods for approximate spectral deflation for inhomogeneous scattering problems. Conference Presentations Householder Symposium XIX on Numerical Linear Algebra, Spa, Belgium June 2014: Invited Talk - Randomized Methods for Rank-Deficient Linear Systems Workshop on Numerical Linear Algebra and Optimization, University of British Columbia, Vancouver, BC August 2013: Invited Speaker - Approximate Murphy-Golub-Wathen Preconditioning for Saddle Point Problems. Society for Industrial and Applied Mathematics (SIAM) Annual Meeting, San Diego, CA July 2013: Invited Minisymposium Talk - An Approximate Deflation Preconditioning Method Based on Multiple Grids for Wave Scattering Problems. SIAM Computational Science and Engineering Conference, Boston, MA February 2013: Invited Minisymposium Talk - Quadrature Methods for Plane Wave Based FMM. SIAM Annual Converence, Minneapolis, MN July 2012: Murphy-Golub-Wathen Preconditioning for KKT Matrices. Invited Minisymposium Talk - Approximate SIAM Conference on Applied Linear Algebra, Valencia, Spain June 2012 Invited Minisymposium Talk - Approximate Deflation Preconditioning Methods for Penetrable Scattering Problems. Householder Symposium XVIII on Numerical Linear Algebra, Lake Tahoe, Nevada June 2011 Invited Talk - Convergence Theory for a Restarted GMRES Method with Approximate Deflation Preconditioning. SIAM Annual Meeting, San Diego, California 2008: Invited Talk - Preconditioning the Lippmann-Schwinger Equations For Scattering By Thin Structures. SIAM Texas Student Conference at the University of Texas, Austin, February 2008: Talk - Preconditioning the Integral Formulation of the Helmholtz Equation via Deflation. Advances in Computational Scattering at the Banff International Research Station, Banff, Canada, February 2005: Poster - GMRES performance in integral equation methods for scattering by inhomogeneous media. AGEP National Conference in Albuquerque, NM, September 2002: Poster - Heavy Metal: Using Computational Fluid Flow Software in the creation of special effects in a video. Rice University Undergraduate Research Symposium, Houston, TX, April 2002: Finite Element Software for solving the Incompressible Navier Stokes Equations. 2

3 Other Research and Advanced Study experiences Summer 2007: Summer 2003: Summer 2002 Summer 2004: Summer Spring 2002 AWARDS Institute for Math and it s Applications at the University of Minnesota, Industrial Mathematics Workshop - worked on algorithms to identify rigid motion relationships between unmatched sets of data points in three dimensions Frank Jones Scholar Program - Participated in lecture rotation on advanced topics in Geometry Rice University Alliance For Graduate Education and the Professoriate (AGEP) Summer Research Program and the CAAM department- Examined computer animation and special effects techniques by implementing computational fluid flow software Rice University Mechanical Engineering Department and partly through the AGEP summer research program - Performed research in computational fluid dynamics to explore several problems in fluid flow and software validation : National Science Foundation Graduate Research Fellowship April 2003: December 2002 May 2001 & May 2002: TEACHING EXPERIENCE Instructor/Professor James Waters Award for Creativity in Engineering - Rice University School of Engineering - awarded to senior engineering student with most creative engineering project to result in publication. I received the award for my project titled Heavy Metal: The use of computational fluid flow software to create a special effects in video Most Outstanding CAAM senior student - Rice Engineering Alumni Mavis C Pittman Memorial Award in Visual Arts - Rice University Visual Arts Department Lovett Travel Grant for Artistic Study Abroad - Rice University Visual Arts Department Hispanic Engineer National Achievement Awards Conference (HENAAC) Engineer of the week - HENAAC Hispanic Association for Cultural Enrichment at Rice (HACER) award for most outstanding student -HACER at Rice University Texas A&M MATH Ordinary Differential Equations MATH 308H - Honors Ordinary Differential Equations MATH Analytical Geometry and Calculus for Math and Natural Science Majors Rice University CAAM Differential Equations in Science and Engineering (Introduction to Partial Differential Equations) Teaching Assistant Rice University CAAM Differential Equations in Science and Engineering Other Rice University Mathematics Leadership Institute - Instructed and helped to develop curriculum in geometry, algebra, and combinatorics for high school math teachers as part of a program designed to immerse high school math teachers in the experience of learning and discovery as a mathematician SERVICE AND OUTREACH July 2013 Organized Minisymposium in the Workshop Celebrating Diversity at the SIAM Annual Meeting 3

4 Summer 2013 February 2012 April 2011 Spring 2008 Spring 2007, 2008, 2009 Research Mentor for Math-Biology Research Experience for Undergraduates at Texas A&M University Banquet Co-Chair at the Tapia Celebration of Diversity in Computing Conference. Banquet Co-Chair at the Tapia Celebration of Diversity in Computing Conference. Served as one of two student members of graduate admissions committee. Organized departmental visits of prospective graduate students, including participating in a series of talks on current research in the department Panelist Speaker Educating Texas Future Innovators, The Academy of Medicine, Engineering, and Science of Texas, Austin, TX - January 7, 2011 Empowering Leadership Alliance Student Leaders Panel, Rice University, Houston, TX - April 12, 2008 Empowering Leadership Graduate Student Panel, University of Texas, Austin - October 2, 2007 Teaching Assistant Panel Discussion, Rice University Graduate Student Orientation - August 22, 2007 Alliance for Graduate Education and the Professoriate Rice University, Houston, TX - April 5, 2007 Who Wants To Be a Mathematician, The Institute for Math and it s Applications, University of Minnesota, Minneapolis, Minnesota - November 3, 2006 What I d like to change in K-12 education Alliance for Graduate Education the Professoriate at Rice University - January 10, 2003 Outreach Heavy Metal - Fusing Art and Mathematics Through Cars: Beginning during my junior year, I began to give to many audiences across the nation a multimedia presentation called Heavy Metal: Fusing Art and Mathematics Through Cars, as a part of Dr. Richard Tapia s presentation series: Math is Cool. The objective of the Math is Cool series is to demonstrate the beauty of mathematics and how math can be used in all parts of life. My talk is on using mathematics to create special effects for a video to be shown alongside a show car at custom car shows. We have given this talk to dozens of audiences ranging from K-12 to Ph.d level audiences and has been very well received at all levels. Listed below are some of the occasions we gave this talk. AGEP PRiME: Purdue Research in Mathematics Experience, Purdue University, West Lafayette, IN - June 2011 Tapia Celebration of Diversity in Computing, San Francisco, CA - April 2011 Science And Engineering Career Academy at Rice University, Houston, TX - June 20, 2008 Acre Homes Math and Science Summer Program, Houston, TX - June 20, 2008 Alliance for Graduate Education and the Professoriate Colloquium - June 6, 2008 Houston Autorama Education Day, Houston, TX - November 23, 2007 Broadening Participation and Retaining Underrepresented Students in STEM and Computing Conference, University of California-Los Angeles - November Richard Tapia Celebration of Diversity in Computing, Orlando, Florida - October 16, 2007 Keynote Speaker with Dr. Richard Tapia at the Society for the Advancement of Chicano and Native American Scientists Annual Conference, Kansas City, Missouri - October 14, 2007 Rice University Summer Mathematics Project Colloquium Speaker - June

5 Harvey Mudd College Claremont, California - January 23, 2007 Blackwell - Tapia Conference at the IMA, University of Minnesota, Minneapolis, Minnesota November 3, 2006 Mexican American Engineers and Scientists (MAES), University of Houston, Houston, Texas - October 2006 Arlington Independent School District, Arlington, Texas. - May, 2006 Cesar Chavez Birthday Celebration of Diverse Mathematicians, Arizona State University - April Blackwell - Tapia Conference at the Institute for Pure and Applied Mathematics at the University of California, Los Angeles - November 6, 2004 Rice University Families Weekend, Houston, TX - October, 2004 Austin High School Math Club, Houston, TX - December 18, 2003 Hispanic Career and Education Day, Houston, TX - April 15, 2003 Rice University Homecoming Lecture series Houston, TX - November 7, 2003 Blackwell - Tapia Conference at the Mathematical Science Research Institute at the University of California, Berkeley - November 1,