Skip Navigation

S. Lakshmivarahan

S. Lakshmivarahan

Ramkumar Parthasarathy

George Lynn Cross Research Professor Emeritus- Since 2019

Email: varahan@ou.edu

Office: Devon Energy Hall Room 210

Education

Ph.D., Electrical Engineering -1973
Indian Institute of Science
M.S. Applied Electronics and Servomechanism-1969
Indian Institute of Science
B.E., Electrical Technology-1967
Indian Institute of Science
B.S., Physics-1964
University of Madras

Research Focus

  • Dynamic Data Assimilation, Bigdata Analytics, Randomized Algorithms for Linear Algebra, Parallel Processing, and Learning Algorithms.

Experience and Awards

  • George Lynn Cross Research Professor Emeritus – Since 2019
  • George Lynn Cross Research Professor, University of Oklahoma-1995-2019
  • Professor, University of Oklahoma -1984-95
  • Associate Professor, University of Oklahoma-1978-84
  • Visiting Assistant Professor, Yale University-1976-78
  • Visiting Assistant Professor, Brown University-1975-76
  • Assistant Professor, Indian Institute of Technology, Madras, India-1973-75
Awards, Honors, and Professional Activities
  • Inducted into the Oklahoma Higher Education Hall of Fame-2014
  • IEEE Life Fellow-2013
  • NAA best paper Award for the book on Dynamic Data Assimilation-2007
  • OU Alumni Teaching Award- 2007, 2008. 2009
  • George Lynn Cross Research Professorship-1995
  • Fellow of ACM-1995
  • Fellow of IEEE-1993
  • OU Regents Award for Superior Teaching-1991
  • OU College of Engineering Distinguished Lecturer-1987-1992
  • OU Associate Distinguished Lecturer-1986-1987
  • Halliburton Distinguished Lecturer-1984-1986
  • OU Regents Award for Superior Accomplishment in Research and Creative Activities-1982

Dr. S. Lakshmivarahan (Varahan for short) joined the University of Oklahoma in the fall of 1978 where he served as faculty for the next 41 years at the School of Computer Science, University of Oklahoma (OU). After a total of 46 years of full time in academia, he retired as a George Lynn Cross Research Professor Emeritus in 2019. From 1973-1978 he held postdoctoral and faculty positions at Brown University, Yale University, and Indian Institute of Technology, Madras, India. He obtained his PhD in 1973 from the Indian Institute of Science in Bangalore, India. He is the author/coauthor of 7 books, over 97 journal papers and over 120 papers at the international/ national conferences. He has supervised/co-supervised 33 PhD dissertations, and 42 MS theses. He is a Fellow of the IEEE and a Fellow of the ACM and has won OU Regents awards for both research and teaching. He was inducted into the Oklahoma Higher Education Hall of Fame in 2014. He has held short-term visiting appointments at leading academic centers in Brazil, Canada, China, England, Germany, India, Japan, Mexico, Taiwan, Thailand, and USA.

EPSCOR RII Track 2 Oklahoma-Kansas, “A Cyber Commons for Ecological Forecasting,” $300K, 2009- 2012. NSF.

“Real Time Data Mining of Integrated Weather Data,” with T. Trafalis, Mike Richman and A. White, $950K, 2002-2005.

  • J. M. Lewis and S. Lakshmivarahan (2024) "The Saltzman-Lorenz Exchange in 1961: Bridge to the Butterfly Metaphor" Bulletin of the American Meteorological Society, July 2024, E1388-1398
  •  A. Sheshadri and S. Lakshmivarahan (2023) Minimal chaotic models from the Volterra gyrostat, Physica-D, 456 (2023) 133948
  •  Ahmed, S., O. San, S. Lakshmivarahan and J.M. Lewis,2023: On the dual advantage of placing observations though forward sensitivity analysis, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 479:20220815, https://doi.org/10.1098/rspa.2022.0185
  • S. Lakshmivarahan, J. M. Lewis and S. Maryada (2022) “On the role of observability Gramian in placement of observations in dynamic data assimilation” in Data Assimilation for Atmospheric, Oceanic and Hydrologic Applications, Vol VI, (Ed)by S. Park, and L. Liang, Springer Verlag, 215-258
  • S. Lakshmivarahan, J. M. Lewis, and R. Jabrzemski (2017) Forecast Error Correction using Dynamic Data Assimilation, Springer, New York