Research
My research
interests include probabilistic modeling, simulation and optimization from a
methodological standpoint, and the majority of my current and previous work involves
applying these techniques to solve problems in healthcare delivery, biomedical
systems, and health economics. However, I have worked in other areas as well,
including applying machine learning and optimization techniques to problems in
finance, airport operations, manufacturing automation, etc.
Publications
and patents based on research conducted at IIT Delhi are listed below.
Patents
§ Chopra,
P., Trehan, V., Madan, K., & Ramamohan, V. (2022) System and method to
diagnose respiratory diseases in real-time. Patent number: 409920; application
number: 202011024378. Date of filing: 10 June 2020; date of grant: 26 October
2022.
Published/accepted
§
Biswas,
T., Ramamohan, V., Majumder, T., Alam, S., Sood, V., Khanna, R., Maheshwari,
A., Bajpai, M., & Lal, B.B. (2026). Machine learning models for prediction
of response to therapeutic plasma exchange in pediatric
acute liver failure. Accepted, Journal of Clinical & Experimental
Hepatology. Available here.
§
Das,
S., Ramamohan, V., Chani, P.S., & Joshi, A. (2026). A framework for
efficient individual-level longitudinal outcomes estimation for agent-based
simulations. ACM Transactions on Modeling &
Computer Simulation, pp. 1 – 30. Available here: https://dl.acm.org/doi/10.1145/3816154.
§
Mohd,
S., Mustafee, N., Madan, K., & Ramamohan, V.
(2025). Evaluation of a two-stage healthcare facility location approach using
simulation optimization and mathematical optimization. Journal of
Simulation, pp. 1 - 30. DOI: doi.org/10.1080/17477778.2025.2585160.
Preprint here.
§ Fatma, N., Kala, K., & Ramamohan,
V. (2025). Towards mitigating overcrowding in urban Indian healthcare
facilities: stakeholder perception analysis for patient referral mechanisms. BMC
Health Services Research 25, 1428. Available here.
§ Venkataraman, A., Edirippulige,
S., & Ramamohan, V. (2025). A simulation-based evaluation of strategies for
communicating appointment slots to outpatients. In Proceedings of the 2025
Winter Simulation Conference, pp. 830-841. Available here.
§ Gopalappa, C., Martagan,
T., Mayorga, M., Mokashi, A., & Ramamohan, V. (2025). Advancing simulation
in healthcare and life sciences: a panel discussion and paper on future
research directions. In Proceedings of the 2025 Winter Simulation Conference,
pp. 866-880. Available here.
§ Mustafee, N., Tolk, A., Ramamohan, V., &
Strassburger, S. (2025). Editorial: Hybrid modelling and simulation. Journal
of Simulation, 1–2. Available here.
§ Ramamohan, V., Bansal, D., Singh,
H.S., & Shah, Y.S. (2025). Simulation metamodeling via local linear
interpolation. In Proceedings of the 25th Operational Research
Society Simulation Workshop, pp.157-166. Available here.
§ Das, S., Venkataraman, A., &
Ramamohan, V. (2024). A novel approach for outcomes estimation in hybrid
simulation models of disease transmission and progression. In Proceedings of
the 2024 Winter Simulation Conference, pp. 1139-1150. Available here.
§ Venkataraman, A., Fatma,
N., Edirippulige, S., &
Ramamohan, V. (2024). Facilitators and barriers for telemedicine systems in
India from multiple stakeholder perspectives and settings. Telemedicine and
e-Health, 30 (5):1341 - 1356. Preprint here.
§ Fatma,
N., Girish, P.G., Ramamohan, V. (2024). Simulation and machine learning based
real-time delay prediction for complex queuing systems. In: Fakhimi,
M., Mustafee, N. (eds) Hybrid Modeling and
Simulation, pp. 185-212. Simulation Foundations, Methods and Applications.
Springer, Cham. Preprint here.
§ Ramamohan, V., Singhal, S., Gupta,
A.R., & Bolia, N.B. (2024). Discrete simulation optimization for tuning
machine learning method hyperparameters. Journal of Simulation, 18(5):
745-765. Preprint here.
§ Fatma, N., & Ramamohan, V. (2023).
Healthcare seeking behavior among patients visiting
public primary and secondary healthcare facilities in an urban Indian district:
A cross-sectional quantitative analysis. PLOS Global Public Health, 3(9),
e0001101. Available here.
§ Sripada, S., Jain, A., Ramamoorthy,
P., & Ramamohan, V. (2023). A decision support framework for optimal
vaccine distribution across a multi-tier cold chain network. Computers & Industrial Engineering, 109397. Preprint here.
§ Mohd, S., Mustafee,
N., Madan, K., & Ramamohan, V. (2023). Leveraging multi-tier healthcare
facility network simulations for capacity planning in a pandemic. Socio-Economic Planning Sciences, 101660. Preprint here.
§
Mohd,
S., Mustafee, N., & Ramamohan, V. (2023). An
approach towards predicting the computational runtime reduction from
discrete-event simulation model simplification operations. In Proceedings of
the 2023 Winter Simulation Conference, pp. 2554 - 2565. Available here.
§ Fatma, N., Ramamohan, V. A generic modeling approach towards simulating an urban primary and
secondary healthcare facility network. In Proceedings of the 2023 Annual Modeling and Simulation (ANNSIM) Conference, pp. 1-12.
Available here.
§ Fatma, N., Ramamohan, V. (2023)
Patient diversion using real-time delay predictions across healthcare facility
networks. OR Spectrum, 45: 437-476. https://doi.org/10.1007/s00291-022-00704-w.
Preprint here.
§ Khalid, M.A., Bansal, S., &
Ramamohan, V. (2023). An augmented formulation for robust design optimization
of structures using stochastic simulation method. Research in Engineering Design, 34(2): 179-200. Available here.
§ Raman, R., Ramamohan, V., Rathore, A.,
Jain, D., Mohan, A., & Vashistha, V. (2023).
Prevalence of highly actionable mutations among Indian patients with advanced
non-small cell lung cancer: a systematic review and meta-analysis. Asia-Pacific
Journal of Clinical Oncology, 19(1): 158-171. https://doi.org/10.1111/ajco.13802.
§ Fatma, N., & Ramamohan, V. (2022).
Outpatient diversion using real-time length-of-stay predictions. In Proceedings
of the 11th International Conference on Operations Research and Enterprise
Systems - ICORES, pages 56-66. DOI: 10.5220/0010837400003117. Preprint
here.
§ Gupta, S., Mittal, C., Das, S.,
Shriyam, S., Batra, A & Ramamohan, V. A simulation model of breast cancer
incidence, progression, diagnosis and survival in India. In Proceedings of the 2021 Winter Simulation Conference. Available here.
§ Das, S., Mustafee,
N., & Ramamohan, V. A discrete simulation optimization approach towards
calibration of an agent-based simulation model of hepatitis C virus
transmission. In Proceedings of the 2021 Winter Simulation Conference.
Available here.
§ Sen, D., Ramamoorthy, P., & Ramamohan,
V. Optimal minimal-contact routing of randomly arriving agents through
connected networks. In Proceedings of the
2021 Winter Simulation Conference.
Available here.
§ Shoaib, M., & Ramamohan, V.
(2022). Simulation modelling and analysis of primary health centre operations. Simulation: Transactions of the Society for Modeling & Simulation International, 98(3):
183-208. DOI: https://doi.org/10.1177/00375497211030931. Preprint here.
§ Fatma, N., & Ramamohan, V. Patient
diversion across primary health centers using real
time delay predictors. In Proceedings of
the 2021 IISE Annual Conference. Preprint here.
§ Shoaib, M., & Ramamohan, V.
Simulation Modelling and Analysis of Community Health Centre Operations. In Proceedings of the 2021 IISE Annual
Conference. Preprint here.
§ Fatma, N., Mohd, S., Ramamohan, V.,
& Mustafee, N. Primary healthcare delivery
network simulation using stochastic metamodels. In 2020 Winter Simulation Conference, pp. 818-829. IEEE Press. Invited
paper. Available here.
§ Baldwa, V., Sehgal, S., Ramamohan, V., &
Tandon, V. A combined simulation and machine learning approach for real-time
delay prediction for waitlisted neurosurgery candidates. In 2020 Winter
Simulation Conference, pp. 956-967. IEEE Press. Available here.
§ Shoaib, M., Prabhakar, U., Mahlawat, S., & Ramamohan, V. (2022). A discrete-event
simulation model of the kidney transplantation system in Rajasthan,
India. Health Systems, 11(1): 30-47. DOI: 10.1080/20476965.2020.1848355.
Preprint here.
§ Singh, H., & Ramamohan, V. (2020).
A model-based investigation into urban-rural disparities in tuberculosis
treatment outcomes under the Revised National Tuberculosis Control Programme in
India. PLoS ONE, 15(2), e0228712. DOI: https://doi.org/10.1371/journal.pone.0228712.
§ Das, S., Sen, D., Ramamohan, V., &
Sood, A. An agent-based model of hepatitis C virus transmission dynamics in
India. In 2019 Winter Simulation Conference, pp. 984-995. IEEE
Press. Available here.
§ Vardhan, U., & Ramamohan, V. A
simulation optimization approach to optimal calibrator level selection for
clinical immunoassays. In 2018 Winter Simulation Conference, pp.
2471-2482. IEEE Press. Available here.
Under
review/preparation
§ Fatma, N., & Ramamohan, V.
Healthcare facility assignment using real-time length-of-stay predictions:
queuing-theoretic and simulation-driven machine learning approaches. Preprint here.
§ Chanda, R., Singhal, R., Sethi, M.,
& Ramamohan, V. A statistical assessment of the impact of machine learning
inputs on the performance of integer-valued Markowitz-type portfolios. Preprint
here.
§ Alfas, M., Varma, S.G., Masiwal, M., Chennuri, A.K.,
Ramamohan, V., & Vepakomma, N. Network-based
pedestrian dynamics model for facility layout planning in airport check-in
systems. Preprint here.
§ Venkataraman, A., Ramamohan, V., &
Edirippulige, S. Organizational flexibility in hybrid
outpatient care: evidence from a mixed-methods study of clinician perspectives
on telemedicine. Preprint here.
§ Das, S., & Ramamohan, V. Impact of
parameterization on the convergence of the stochastic ruler method for discrete
simulation optimization. Preprint here.
§ Mohd, S., Mustafee,
N., & Ramamohan, V. A framework for predicting the runtime savings from
discrete-event simulation model simplification operations. Preprint here.
§ Das, S., Sood, A., Midha, V., Singh,
A., Sharma, P., & Ramamohan, V. Impact of transmission dynamics and
treatment uptake, frequency and timing on the cost-effectiveness of directly
acting antivirals for hepatitis C virus infection. Preprint here.
§ Narula, A., Ramamoorthy, P., &
Ramamohan, V. Minimal contact routing across connected networks for
stochastically arriving agents: a mixed integer linear programming framework.
Preprint here.
§ Chopra,
P., Trehan, V., Madan, K., & Ramamohan, V. An expert-assisted chest radiograph classification tool
to differentiate between active tuberculosis and healed tuberculosis sequelae.
Preprint here.
§ Ramamohan, V., Agrawal, U., &
Goyal, M. A note on the stochastic ruler method for discrete simulation
optimization. Preprint here.
§ Ramamohan, V., Goyal, N., Parth, P., Mahlawat, S., & Prabhakar, U. A framework for utilizing
stock trend prediction outputs in stock selection and portfolio
optimization. Preprint here.
§ Sen, D., Goyal, K., Ghosh, A., &
Ramamohan, V. Discriminatory price mechanism for smart grid. Preprint here.
Software
IndRailSim:
an open-source Python package for simulating railway operations. Available here, with Readme
file.