{"202801":{"#nid":"202801","#data":{"type":"event","title":"CDA Distinguished Lecture: Dr. Yousef Saad","body":[{"value":"\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESpeaker:\u003C\/strong\u003E Dr. Yousef Saad, College of Science \u0026amp; Engineering Distinguished Professor in the Department of Computer Science \u0026amp; Engineering at the University of Minnesota\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ETitle: \u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EMultilevel Algebraic Preconditioning Techniques with Applications\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003Cstrong\u003EAbstract: \u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ESolving linear systems of equations with iterative methods is becoming more difficult due to a number of new challenges. Matrices of these systems are becoming larger, more ill-conditioned, and are often poorly structured, and indefinite. Multilevel methods have been advocated for handling some of these challenges. This talk will introduce a variety of multilevel preconditioners for solving linear systems of equations, with an emphasis on indefinite systems. We begin with the Algebraic Recursive Multilevel Solver (ARMS) and see how a class of \u0022coarsening\u0022 schemes can be adapted to this framework.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EILU-type preconditioners have difficulties for some types of indefinite problems. We will show how they can be adapted for problems arising from Helmholtz equations. Then a new class of methods based on low-rank approximations which has some appealing features will be introduced. The methods handle indefiniteness quite well and are more amenable to SIMD computations, which makes them attractive for GPUs.\u0026nbsp; We will then present an application in dynamic mean field theory (DMFT) where the problem is to compute the diagonal of the inverse of a matrix.\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003Cstrong\u003EBio:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EYousef Saad is a College of Science \u0026amp; Engineering Distinguished Professor in the Department of Computer Science \u0026amp; Engineering at the University of Minnesota.\u0026nbsp; He holds the William Norris Chair for Large-Scale Computing and is a fellow of SIAM and AAAS.\u0026nbsp; He is known for his contributions to matrix computations, including iterative methods for solving large sparse linear algebraic systems, eigenvalue problems, and parallel computing.\u0026nbsp; Dr. Saad is an ISI highly cited researcher in mathematics and is the author of the highly cited book, Iterative Methods for Sparse Linear Systems.\u0026nbsp; For more information, please visit \u003Ca href=\u0022http:\/\/www-users.cs.umn.edu\/~saad\/\u0022\u003Ehttp:\/\/www-users.cs.umn.edu\/~saad\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Multilevel Algebraic Preconditioning Techniques with Applications"}],"uid":"27439","created_gmt":"2013-03-28 12:22:28","changed_gmt":"2016-10-08 02:03:06","author":"Lometa Mitchell","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2013-04-05T15:00:00-04:00","event_time_end":"2013-04-05T16:00:00-04:00","event_time_end_last":"2013-04-05T16:00:00-04:00","gmt_time_start":"2013-04-05 19:00:00","gmt_time_end":"2013-04-05 20:00:00","gmt_time_end_last":"2013-04-05 20:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"1304","name":"High Performance Computing (HPC)"},{"id":"37041","name":"Computational Science and Engineering"},{"id":"47223","name":"College of Computing"},{"id":"50875","name":"School of Computer Science"},{"id":"50876","name":"School of Interactive Computing"},{"id":"50877","name":"School of Computational Science and Engineering"}],"categories":[],"keywords":[],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003EHost: Edmond Chow; \u003Ca href=\u0022mailto:echow@cc.gatech.edu\u0022\u003Eechow@cc.gatech.edu\u003C\/a\u003E\u003C\/p\u003E","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}