I received my bachelor’s and master’s degrees in electrical engineering from Indian Institute of Technology Madras in 2009, and the Ph.D. degree in electrical and computer engineering from Colorado State University in 2014 under the supervision of Prof. Edwin K. P. Chong. Before joining SDSMT, I held a postdoctoral position at Arizona State University in the School of Mathematical and Statistical Sciences working with Prof. Hans D. Mittelmann.
My research primarily deals with optimal control, decision making under uncertainty, predictive modeling, data analytics, and optimization in autonomous/semi-autonomous systems.
I am a Senior Member of IEEE.
News
12/2020: Our paper "Random-sampling Monte-Carlo tree search methods for cost approximation in long-horizon optimal control" is accepted for publication in IEEE Control Systems Letters.
11/2020: Congratulations! Shawon Dey successfully defended his MS thesis - 11/17/2020.
11/2020: Congratulations! Md Ali Azam successfully defended his MS thesis - 11/16/2020.
09/2020: Received new 2-year grant from South Dakota NASA EPSCoR - Research Initiation Grant program "Near real-time wildfire smoke detection and monitoring from satellite imagery using artificial intelligence" (PI: Ragi, Co-PI: X. Zhang (SDSU)).
08/2020: Our paper "A decision theoretic approach for waveform design in joint radar communications applications" to appear in the 54th Asilomar Conference on Signals, Systems and Computers (Asilomar), 2020.
05/2020: Our paper "Random-Sampling Multipath Hypothesis Propagation for Cost Approximation in Long-Horizon Optimal Control" to appear in the IEEE Conference on Control Technology and Applications (CCTA), 2020.
02/2020: Our lab now has 6-camera OptiTrack motion capture system - will be used for drone motion planning and position tracking research.
02/2020: Will give an invited talk at a speaking event sponsored by the IEEE Siouxland Section Computer Society on Feb 20, 2020 in Brookings, SD. Link to the event!
01/2020: Received new 1-year grant from NSF EPSCoR RII Track-1 Seed Grants supporting our research on "Exploring Rheology Properties of Biofilm with Multifractal and Multiscale Data Analytics" (PI: Ragi, Co-PIs: Travis Walker, Govind Chilkoor, Jawahar Kalimuthu)
01/2020: New graduate student in the group: Jamison Duckworth
12/2019: Received new 1-year grant from South Dakota Bioscience Commercialization Alliance supporting our research on "UAV-based hyperspectral sensing (UHS) solution for agricultural soil monitoring" (PI: Ragi)
12/2019: Our paper 'Radar Waveform Optimization for Joint Radar Communications Performance' is accepted for publication in Electronics journal
11/2019: Congratulations - Chinmaya Kaji successfully defended his MS thesis - 11/25/2019
08/2019: New graduate students in the group: Abir Hossen, Shammi Doly, Hafizur Rahman
03/2019: Our paper 'Novel Radar Waveform Optimization for a Cooperative Radar-Communications System' is accepted for publication in IEEE Transactions on Aerospace and Electronic Systems
02/2019: University press release on our research Research@Mines. Local TV coverage: KOTA TV, Black Hills Fox
02/2019: Received new 3-year Air Force Office of Scientific Research (AFOSR) grant supporting our research on "Optimizing Systems with Conflicting Objectives for a Limited Resource" (Subaward from Arizona State University. PI: Hans D. Mittelmann; Co-PI: Ragi)
02/2019: New graduate student in the group: Shawon Dey
11/2018: Our paper 'Polynomial-time methods to solve unimodular quadratic programs with performance guarantees' is accepted for publication in IEEE Transactions on Aerospace and Electronic Systems
8/2018: New graduate students in the group: Azam Ali and Chinmaya Kaji
Publications
Journal Papers:
[J1] A. V. Weigel, S. Ragi, M. L. Reid, E. K. P. Chong, M. M. Tamkun, and D. Krapf,
"Obstructed diffusion
propagator analysis for single-particle tracking,"
Physical Review E,
vol. 85, no. 4, paper 041924, April 2012.
DOI
Conference Papers and Presentations:
[C15] S. A. Doly, A. Chiriyath, H. D. Mittelmann, D. W. Bliss, and S. Ragi, "A decision theoretic approach for waveform design in joint radar communications applications," in Proceedings of the 54th Asilomar Conference on Signals, Systems and Computers (Asilomar 2020), Pacific Grove, CA, Nov 01--04, 2020, to appear.
[C14] A. D. Chakravarthy, P. Chundi, M. Subramaniam, S. Ragi, and V. R. Gadhamshetty, "A Thrifty Annotation Generation Approach for Semantic Segmentation of Biofilms," in Proceedings of the 20th IEEE International Conference on Bioinformatics and Bioengineering (BIBE), Virtual Conference, Oct 26--28, 2020, to appear.
[C12] H. Rahman, J. Duckworth, S. Ragi, P. Chundi, G. Chilkoor, and V. Gadhamshetty, "Deep Learning Approach to Extract Geometric Features of Bacterial Cells in Biofilms," in The 16th International Conference on Data Science (ICDATA'20), Las Vegas, NV, July 27--30, 2020, to appear.
[C11] M. Azam and S. Ragi, "Decentralized formation shape control of UAV swarm using dynamic programming," in Proceedings of SPIE 11423, Signal Processing, Sensor/Information Fusion, and Target Recognition XXIX, 114230I, Anaheim, CA, April 26--30, 2020.
[C10] M. Azam, S. Dey, H. D. Mittelmann, and S. Ragi, "Average consensus-based data fusion in networked sensor systems for target tracking," in 2020 10th Annual Computing and Communication Workshop and Conference (CCWC), Las Vegas, NV, Jan 06--08, 2020, pp. 964--969.
[C9] S. Ragi, S. Dey, M. Azam, and H. D. Mittelmann,
"Competing objective optimization in networked swarm systems," in Proceedings of the 2019 IEEE National Aerospace & Electronics Conference (NAECON) , Dayton, OH, July 15--19, 2019, pp. 88--91.
[C6] S. Ragi, E. K. P. Chong, and H. D. Mittelmann,
"Heuristic methods for designing unimodular code
sequences with performance guarantees," in Proceedings of IEEE International Conference on
Acoustics, Speech and Signal Processing (ICASSP 2017), New Orleans, LA, March 5--9, 2017, pp. 3221--3225.
[C5] S. Ragi, H. D. Mittelmann, and E. K. P. Chong,
"Directional sensor control for
maximizing information gain,"
in Proceedings of SPIE Optical Engineering + Applications
(SPIE Vol. 8857),
part of SPIE Optics + Photonics Symposium,
San Diego, California, August 25--29, 2013,
paper number 8857-19.
[C1] S. Ragi and E. K. P. Chong, "Dynamic UAV path planning for
multi-target tracking," presented (poster) at the 1st
Southwest
Workshop on Theory and Applications of Cyber-Physical Systems,
Tucson, Arizona, March 10--11, 2011.
Book Chapters
- S. Ragi and E. K. P. Chong,
"UAV guidance algorithms via partially observable Markov decision
processes,"
in Handbook of
Unmanned Aerial Vehicles,
K. P. Valavanis and G. J. Vachtsevanos, Eds.,
Dordrecht, Netherlands: Springer,
ISBN 978-90-481-9706-4,
2015, ch. 73, Section XIII,
pp. 1775--1810.
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