Jagdish Ramakrishnan

Walmart Labs
San Bruno, CA USA
jramakrishnan [ at ] walmartlabs [ dot ] com
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Brief Biography

Welcome! I am a staff data scientist on the smart pricing team at Walmart Labs. Previously, I was a research associate in the optimization group at the Wisconsin Institute for Discovery (WID), University of Wisconsin-Madison. My primary research area is operations research; I typically use mathematical modeling, optimization, statistical/data analysis, and machine learning approaches to make better decisions for real-world problems. I enjoy working on various kinds of applications, including problems in revenue management (e.g., price optimization), in medical decision making (e.g., radiation therapy cancer treatment), agricultural management, and energy management (e.g., stochastic unit commitment).

I received my Ph.D. degree at MIT, Department of Electrical Engineering and Computer Science (EECS), and was affiliated with the Laboratory for Information and Decision Systems (LIDS). My advisors were Prof. John N. Tsitsiklis (MIT), Prof. David Craft (MGH), and Prof. Thomas Bortfeld (MGH). I previously received my Bachelor's and Master's degrees in Electrical and Computer Engineering (ECE) from Georgia Tech.

Journal Articles

  1. H. Badri, J. Ramakrishnan, and K. Leder, "Minimizing metastatic risk in radiotherapy fractionation schedules," accepted, Physics in Medicine and Biology, Sept 2015.

  2. T. Bortfeld, J. Ramakrishnan, J. N. Tsitsiklis, and J. Unkelbach, "Optimization of radiation therapy fractionation schedules in the presence of tumor repopulation," accepted May 2015, INFORMS Journal on Computing.

  3. J. Unkelbach, D. Craft, T. Hong, D. Papp, J. Ramakrishnan, E. Salari, J. Wolfgang, and T. Bortfeld, "Exploiting tumor shrinkage through temporal optimization of radiotherapy," Physics in Medicine and Biology, Vol. 59, 2014, pp. 3059-3079, doi.

  4. J. Unkelbach, D. Craft, E. Salari, J. Ramakrishnan, and T. Bortfeld, "The dependence of optimal fractionation schemes on the spatial dose distribution," Physics in Medicine and Biology, Vol. 58, 2013, pp. 159-167, doi.
    News article featured on medicalphysicsweb (link)

  5. J. Ramakrishnan, D. Craft, T. Bortfeld, and J. N. Tsitsiklis, "A dynamic programming approach to adaptive fractionation," Physics in Medicine and Biology, Vol. 57, 2012, pp. 1203-1216, doi.

Other Reports

  1. S. Dirkse, M. C. Ferris, and J. Ramakrishnan, "GDXMRW: Interfacing GAMS and MATLAB,", [see also wisc link], documentation part of GAMS 24.3, Aug 2014.

  2. J. Ramakrishnan and M. C. Ferris, "SOCP Radiotherapy Benchmark Test Case in CBLIB," documentation of test case in cblib, the conic benchmark library, Oct 2014. Poster reference here.

Ph.D. Thesis


List of Co-Authors

Thomas Bortfeld (MGH), David Craft (MGH), Steven Dirkse (GAMS), Michael C. Ferris (UW-Madison), Ted Hong, MD (MGH), Kevin Leder (UMN), Dávid Papp (MGH), Ehsan Salari (Wichita), John N. Tsitsiklis (MIT), Jan Unkelbach (MGH), John Wolfgang (MGH)

Teaching Experience

Last Modified: 2015/10/05, Erdös number = 4 :) [me -> J. N. Tsitsiklis -> K. Xu -> J. H. Spencer -> P. Erdös]