Robustness to Dependency in Influence Maximization. - Chen, Louis; Lim, Chee Chin; Padmanabhan, Divya; Natarajan, Karthik (Manag. Sci., 2025)

Pairwise independent correlation gap. - Ramachandra, Arjun Kodagehalli; Natarajan, Karthik (Oper. Res. Lett., 2025)

Using patient portals for large-scale recruitment of individuals underrepresented in biomedical research: an evaluation of engagement patterns throughout the patient portal recruitment process at a single site within the All of Us Research Program. - Beaton, Maura; Jiang, Xinzhuo; Minto, Elise L.; Lau, Chun Yee; Turner, Lennon; Hripcsak, George; Chaudhari, Kanchan; Natarajan, Karthik (J. Am. Medical Informatics Assoc., 2024)

Identifying erroneous height and weight values from adult electronic health records in the All of Us research program. - Guide, Andrew; Sulieman, Lina; Garbett, Shawn; Cronin, Robert M.; Spotnitz, Matthew E.; Natarajan, Karthik; Carroll, Robert J.; Harris, Paul A.; Chen, Qingxia (J. Biomed. Informatics, 2024)

CEHR-GPT: Generating Electronic Health Records with Chronological Patient Timelines. - Pang, Chao; Jiang, Xinzhuo; Pavinkurve, Nishanth Parameshwar; Kalluri, Krishna S.; Minto, Elise L.; Patterson, Jason; Zhang, Linying; Hripcsak, George; Elhadad, Noémie; Natarajan, Karthik (CoRR, 2024)

Environment Scan of Generative AI Infrastructure for Clinical and Translational Science. - Idnay, Betina; Xu, Zihan; Adams, William G.; Adibuzzaman, Mohammad; Anderson, Nicholas R.; Bahroos, Neil; Bell, Douglas S.; Bumgardner, Cody; Campion, Thomas R., Jr.; Castro, Victor M.; Cimino, James J.; Cohen, I. Glenn; et al. (CoRR, 2024)

Clinical and temporal characterization of COVID-19 subgroups using patient vector embeddings of electronic health records. - Ta, Casey N.; Zucker, Jason E.; Chiu, Po-Hsiang; Fang, Yilu; Natarajan, Karthik; Weng, Chunhua (J. Am. Medical Informatics Assoc., 2023)

Representing and utilizing clinical textual data for real world studies: An OHDSI approach. - Keloth, Vipina Kuttichi; Banda, Juan M.; Gurley, Michael J.; Heider, Paul M.; Kennedy, Georgina; Liu, Hongfang; Liu, Feifan; Miller, Timothy A.; Natarajan, Karthik; Patterson, Olga V.; Peng, Yifan; Raja, Kalpana; et al. (J. Biomed. Informatics, 2023)

Probability bounds for n random events under (n - 1)-wise independence. - Natarajan, Karthik; Ramachandra, Arjun Kodagehalli; Tan, Colin (Oper. Res. Lett., 2023)

Tight Probability Bounds with Pairwise Independence. - Ramachandra, Arjun Kodagehalli; Natarajan, Karthik (SIAM J. Discret. Math., 2023)

Discrete Optimal Transport with Independent Marginals is #P-Hard. - Taskesen, Bahar; Shafieezadeh-Abadeh, Soroosh; Kuhn, Daniel; Natarajan, Karthik (SIAM J. Optim., 2023)

A Model for Multi-Institutional Clinical Data Repository. - Natarajan, Karthik; Weng, Chunhua; Sengupta, Soumitra (2023)

A Nonparametric Approach with Marginals for Modeling Consumer Choice. - Ruan, Yanqiu; Li, Xiaobo; Murthy, Karthyek; Natarajan, Karthik (2023)

Distributionally Robust Linear and Discrete Optimization with Marginals. - Chen, Louis; Ma, Will; Natarajan, Karthik; Simchi-Levi, David; Yan, Zhenzhen (Oper. Res., 2022)

Comparing medical history data derived from electronic health records and survey answers in the All of Us Research Program. - Sulieman, Lina M.; Cronin, Robert M.; Carroll, Robert J.; Natarajan, Karthik; Marginean, Kayla; Mapes, Brandy; Roden, Dan M.; Harris, Paul A.; Ramirez, Andrea H. (J. Am. Medical Informatics Assoc., 2022)

An interactive fitness-for-use data completeness tool to assess activity tracker data. - Cho, Sylvia; Ensari, Ipek; Elhadad, Noémie; Weng, Chunhua; Radin, Jennifer M.; Bent, Brinnae; Desai, Pooja M.; Natarajan, Karthik (J. Am. Medical Informatics Assoc., 2022)

A Representative Consumer Model in Data-Driven Multiproduct Pricing Optimization. - Yan, Zhenzhen; Natarajan, Karthik; Teo, Chung-Piaw; Cheng, Cong (Manag. Sci., 2022)

The All of Us Research Program: Data quality, utility, and diversity. - Ramirez, Andrea H.; Sulieman, Lina M.; Schlueter, David J.; Halvorson, Alese E.; Qian, Jun; Ratsimbazafy, Francis; Loperena-Cortes, Roxana; Mayo, Kelsey R.; Basford, Melissa A.; Deflaux, Nicole; Muthuraman, Karthik; Natarajan, Karthik; et al. (Patterns, 2022)

Extremal Probability Bounds in Combinatorial Optimization. - Padmanabhan, Divya; Ahipasaoglu, Selin Damla; Ramachandra, Arjun Kodagehalli; Natarajan, Karthik (SIAM J. Optim., 2022)

Analyzing healthcare-seeking behavior among All of Us enrollees in the era of COVID-19. - Acharya, Nripendra D.; Nieva, Harry Reyes; Natarajan, Karthik (2022)

Feasibility of Linking Area Deprivation Index Data to the OMOP Common Data Model. - Jiang, Xinzhuo; Beaton, Maura; Gillberg, Jake; Williams, Andrew; Natarajan, Karthik (2022)

Self-paced Training Modality to Promote the Use of All of Us Researcher Workbench in Educational and Research Settings. - Master, Hiral; Sulieman, Lina; Harris, Paul A.; Natarajan, Karthik; Carroll, Robert J.; Marginean, Kayla; Mayo, Kelsey R.; Kouame, Aymone; Lyons, Michael (2022)

Discrete Optimal Transport with Independent Marginals is #P-Hard. - Taskesen, Bahar; Shafieezadeh-Abadeh, Soroosh; Kuhn, Daniel; Natarajan, Karthik (CoRR, 2022)

Submodularity and pairwise independence. - Ramachandra, Arjun Kodagehalli; Natarajan, Karthik (CoRR, 2022)

Effect of Electronic Health Record Reminders for Routine Immunizations and Immunizations Needed for Chronic Medical Conditions. - Stephens, Ashley B.; Wynn, Chelsea S.; Hofstetter, Annika M.; Kolff, Chelsea; Pena, Oscar; Kahn, Eric; Dasgupta, Balendu; Natarajan, Karthik; Vawdrey, David K.; Lane, Mariellen M.; Robbins-Milne, Laura; Ramakrishnan, Rajasekhar; et al. (Appl. Clin. Inform., 2021)

Worst-Case Expected Shortfall with Univariate and Bivariate Marginals. - Dhara, Anulekha; Das, Bikramjit; Natarajan, Karthik (INFORMS J. Comput., 2021)

Tree Bounds for Sums of Bernoulli Random Variables: A Linear Optimization Approach. - Padmanabhan, Divya; Natarajan, Karthik (INFORMS J. Optim., 2021)

On the Heavy-Tail Behavior of the Distributionally Robust Newsvendor. - Das, Bikramjit; Dhara, Anulekha; Natarajan, Karthik (Oper. Res., 2021)

The National COVID Cohort Collaborative (N3C): Rationale, design, infrastructure, and deployment. - Haendel, Melissa A.; Chute, Christopher G.; Bennett, Tellen D.; Eichmann, David A.; Guinney, Justin; Kibbe, Warren A.; Payne, Philip R. O.; Pfaff, Emily R.; Robinson, Peter N.; Saltz, Joel H.; Spratt, Heidi; Suver, Christine; et al. (J. Am. Medical Informatics Assoc., 2021)

Development and validation of prediction models for mechanical ventilation, renal replacement therapy, and readmission in COVID-19 patients. - Rodriguez, Victor Alfonso; Bhave, Shreyas; Chen, Ruijun; Pang, Chao; Hripcsak, George; Sengupta, Soumitra; Elhadad, Noemie; Green, Robert A.; Adelman, Jason S.; Metitiri, Katherine Schlosser; Elias, Pierre A.; Groves, Holden; et al. (J. Am. Medical Informatics Assoc., 2021)

Are synthetic clinical notes useful for real natural language processing tasks: A case study on clinical entity recognition. - Li, Jianfu; Zhou, Yujia; Jiang, Xiaoqian; Natarajan, Karthik; Pakhomov, Serguei V. S.; Liu, Hongfang; Xu, Hua (J. Am. Medical Informatics Assoc., 2021)

Exploiting partial correlations in distributionally robust optimization. - Padmanabhan, Divya; Natarajan, Karthik; Murthy, Karthyek (Math. Program., 2021)

Designing a Data Quality Characterization Tool for Fitness Tracker Data. - Cho, Sylvia; Natarajan, Karthik (2021)

Harmonization of Measurement Codes for Concept-Oriented Lab Data Retrieval. - Spotnitz, Matthew E.; Patterson, Jason; Huser, Vojtech; Weng, Chunhua; Natarajan, Karthik (2021)

Measuring the correctness of All of Us physical measurement. - Sulieman, Lina; Natarajan, Karthik; Chen, Qingxia; Carroll, Robert J.; Marginean, Kayla; Harris, Paul A.; Ramirez, Andrea H. (2021)

REDHot OMOP: Facilitating Semantic Interoperability in REDCap with FHIR and the OMOP CDM. - Volpe, Salvatore G.; Natarajan, Karthik (2021)

Harmonization of Measurement Codes for Concept-Oriented Lab Data Retrieval. - Spotnitz, Matthew E.; Patterson, Jason; Huser, Vojtech; Weng, Chunhua; Natarajan, Karthik (2021)

CEHR-BERT: Incorporating temporal information from structured EHR data to improve prediction tasks. - Pang, Chao; Jiang, Xinzhuo; Kalluri, Krishna S.; Spotnitz, Matthew E.; Chen, Ruijun; Perotte, Adler J.; Natarajan, Karthik (2021)

CEHR-BERT: Incorporating temporal information from structured EHR data to improve prediction tasks. - Pang, Chao; Jiang, Xinzhuo; Kalluri, Krishna S.; Spotnitz, Matthew E.; Chen, Ruijun; Perotte, Adler J.; Natarajan, Karthik (CoRR, 2021)

Content Coverage Evaluation of the OMOP Vocabulary on the Transplant Domain Focusing on Concepts Relevant for Kidney Transplant Outcomes Analysis. - Cho, Sylvia; Sin, Margaret; Tsapepas, Demetra S.; Dale, Leigh-Anne; Husain, Syed A.; Mohan, Sumit; Natarajan, Karthik (Appl. Clin. Inform., 2020)

Composite pattern to handle variation points in software architectural design of evolving application systems. - Philip, Milu Mary; Natarajan, Karthik; Ramanathan, Anithkumar; Balakrishnan, Vijayakumar (IET Softw., 2020)

COVID-19 TestNorm: A tool to normalize COVID-19 testing names to LOINC codes. - Dong, Xiao; Li, Jianfu; Soysal, Ekin; Bian, Jiang; DuVall, Scott L.; Hanchrow, Elizabeth; Liu, Hongfang; Lynch, Kristine E.; Matheny, Michael E.; Natarajan, Karthik; Ohno-Machado, Lucila; Pakhomov, Serguei; et al. (J. Am. Medical Informatics Assoc., 2020)

Identifying Use Cases of Consumer-Grade Fitness Trackers in Research Studies. - Cho, Sylvia; Natarajan, Karthik (2020)

Fitbit "Bring Your Own Device" data in the All of Us Research Program. - Holko, Michelle; Ratsimbazafy, Francis; Marginean, Kayla; Natarajan, Karthik; Cho, Sylvia; Schilling, Josh; Kouame, Aymone; Webster, Dan; Peters, Shaquille; Begale, Mark; Gebo, Kelly; Ramirez, Andrea H.; et al. (2020)

Data Quality Assessment of Laboratory Data. - Huser, Vojtech; Blacketer, Clair; Natarajan, Karthik; Miller, Robert T.; Williams, Andrew; Sathappan, Selva Muthu Kumaran; Posada, José D.; Shah, Nigam (2020)

Characterizing database granularity using SNOMED-CT hierarchy. - Ostropolets, Anna; Reich, Christian G.; Ryan, Patrick B.; Weng, Chunhua; Molinaro, Anthony; DeFalco, Frank J.; Jonnagaddala, Jitendra; Liaw, Siaw-Teng; Jeon, Hokyun; Park, Rae Woong; Spotnitz, Matthew E.; Natarajan, Karthik; et al. (2020)

Characterization and Comparison of Embedding Algorithms for Phenotyping across a Network of Observational Databases. - Pang, Chao; Chen, Ruijun; Nieva, Harry Reyes; Kalluri, Krishna; Sun, Tony; Jiang, Xinzhuo; Rodriguez, Victor Alfonso; Ryan, Patrick B.; Natarajan, Karthik (2020)

Phenotype Concept Set Construction from Concept Pair Likelihoods. - Rodriguez, Victor Alfonso; Sun, Tony; Thangaraj, Phyllis; Pang, Chao; Kalluri, Krishna; Jiang, Xinzhuo; Natarajan, Karthik; Ryan, Patrick B.; Ostropolets, Anna; Chen, Ruijun (2020)

Bias in the Reuse and Analysis of Electronic Health Record Data. - Weiskopf, Nicole Gray; Greer, Melody L.; Natarajan, Karthik; Thompson, Caroline A.; Lehmann, Harold P. (2020)

Normalizing Clinical Document Titles to LOINC Document Ontology: an Initial Study. - Zuo, Xu; Li, Jianfu; Zhao, Bo; Zhou, Yujia; Dong, Xiao; Duke, Jon D.; Natarajan, Karthik; Hripcsak, George; Shah, Nigam; Banda, Juan M.; Reeves, Ruth M.; Xu, Hua (2020)

Correlation Robust Influence Maximization. - Chen, Louis; Padmanabhan, Divya; Lim, Chee Chin; Natarajan, Karthik (2020)

Correlation Robust Influence Maximization. - Chen, Louis; Padmanabhan, Divya; Lim, Chee Chin; Natarajan, Karthik (CoRR, 2020)

Facilitating phenotype transfer using a common data model. - Hripcsak, George; Shang, Ning; Peissig, Peggy L.; Rasmussen, Luke V.; Liu, Cong; Benoit, Barbara; Carroll, Robert J.; Carrell, David S.; Denny, Joshua C.; Dikilitas, Ozan; Gainer, Vivian S.; Howell, Kayla Marie; et al. (J. Biomed. Informatics, 2019)

Distributionally robust project crashing with partial or no correlation information. - Ahipasaoglu, Selin Damla; Natarajan, Karthik; Shi, Dongjian (Networks, 2019)

A Convex Optimization Approach for Computing Correlated Choice Probabilities With Many Alternatives. - Ahipasaoglu, Selin Damla; Li, Xiaobo; Natarajan, Karthik (IEEE Trans. Autom. Control., 2019)

Distributionally Robust Markovian Traffic Equilibrium. - Ahipasaoglu, Selin Damla; Arikan, Ugur; Natarajan, Karthik (Transp. Sci., 2019)

Curating EHR data in the All of Us Research Program. - Natarajan, Karthik; Carroll, Robert J.; Campion, Thomas R., Jr.; Grand, Joan; Visweswaran, Shyam (2019)

Extending Achilles Heel Data Quality Tool with New Rules Informed by Multi-Site Data Quality Comparison. - Huser, Vojtech; Li, Xiaochun; Zhang, Zuoyi; Jung, Sungjae; Park, Rae Woong; Banda, Juan M.; Razzaghi, Hanieh; Londhe, Ajit; Natarajan, Karthik (2019)

Allocating Students to Multidisciplinary Capstone Projects Using Discrete Optimization. - Magnanti, Thomas L.; Natarajan, Karthik (Interfaces, 2018)

Asymmetry and Ambiguity in Newsvendor Models. - Natarajan, Karthik; Sim, Melvyn; Uichanco, Joline (Manag. Sci., 2018)

Bounds for Random Binary Quadratic Programs. - Natarajan, Karthik; Shi, Dongjian; Toh, Kim-Chuan (SIAM J. Optim., 2018)

Treatment Pathways in Patients with Cancer Using a Large-scale Observational Data Network. - Chen, Ruijun; Ryan, Patrick B.; Natarajan, Karthik; Falconer, Thomas; Reich, Christian G.; Vashisht, Rohit; Shah, Nigam; Hripcsak, George (2018)

On reduced semidefinite programs for second order moment bounds with applications. - Natarajan, Karthik; Teo, Chung-Piaw (Math. Program., 2017)

On the polynomial solvability of distributionally robust k-sum optimization. - Dhara, Anulekha; Natarajan, Karthik (Optim. Methods Softw., 2017)

The Data and Research Center of the All of Us Research Program: Framework for a National Cohort Program and Research Opportunities. - Carroll, Robert J.; Mandel, Joshua C.; Natarajan, Karthik; Sutherland, Scott; Denny, Joshua C. (2017)

Evaluation of OMOP Vocabulary on Transplant Registry Data. - Cho, Sylvia; Sin, Margaret; Natarajan, Karthik (2017)

Least Squares Approximation to the Distribution of Project Completion Times with Gaussian Uncertainty. - Zheng, Zhichao; Natarajan, Karthik; Teo, Chung-Piaw (Oper. Res., 2016)

Robustness to Dependency in Portfolio Optimization Using Overlapping Marginals. - Doan, Xuan Vinh; Li, Xiaobo; Natarajan, Karthik (Oper. Res., 2015)

Distributionally robust mixed integer linear programs: Persistency models with applications. - Li, Xiaobo; Natarajan, Karthik; Teo, Chung-Piaw; Zheng, Zhichao (Eur. J. Oper. Res., 2014)

A Probabilistic Model for Minmax Regret in Combinatorial Optimization. - Natarajan, Karthik; Shi, Dongjian; Toh, Kim-Chuan (Oper. Res., 2014)

Diagnosis code assignment: models and evaluation metrics. - Perotte, Adler J.; Pivovarov, Rimma; Natarajan, Karthik; Weiskopf, Nicole Gray; Wood, Frank D.; Elhadad, Noemie (J. Am. Medical Informatics Assoc., 2014)

Compressed Sensing Analog Front-End for Bio-Sensor Applications. - Gangopadhyay, Daibashish; Allstot, Emily G.; Dixon, Anna M. R.; Natarajan, Karthik; Gupta, Subhanshu; Allstot, David J. (IEEE J. Solid State Circuits, 2014)

On Theoretical and Empirical Aspects of Marginal Distribution Choice Models. - Mishra, Vinit Kumar; Natarajan, Karthik; Padmanabhan, Dhanesh; Teo, Chung-Piaw; Li, Xiaobo (Manag. Sci., 2014)

New analytical bounds on the average undershoot in an infinite horizon (s, S) inventory system. - Chiu, Chun-Hung; Leung, Ngai-Hang Z.; Natarajan, Karthik (Oper. Res. Lett., 2013)

Analyzing Requests for Clinical Data for Self-Service Penetration. - Natarajan, Karthik; Wilcox, Adam B.; Sobhani, Niloo; Boyer, Aurelia (2013)

From Boxes to bees: Active learning in freshmen calculus. - Tsai, Flora S.; Natarajan, Karthik; Ahipasaoglu, Selin Damla; Yuen, Chau; Lee, Hyowon; Cheung, Ngai-Man; Ruths, Justin; Huang, Shisheng; Magnanti, Thomas L. (2013)

Informatics Lessons from Using a Novel Immunization Information System. - Vawdrey, David K.; Natarajan, Karthik; Kanter, Andrew S.; Hripcsak, George; Kuperman, Gilad J.; Stockwell, Melissa S. (2013)

On the Complexity of Nonoverlapping Multivariate Marginal Bounds for Probabilistic Combinatorial Optimization Problems. - Doan, Xuan Vinh; Natarajan, Karthik (Oper. Res., 2012)

Choice Prediction With Semidefinite Optimization When Utilities are Correlated. - Mishra, Vinit Kumar; Natarajan, Karthik; Tao, Hua; Teo, Chung-Piaw (IEEE Trans. Autom. Control., 2012)

Mixed 0-1 Linear Programs Under Objective Uncertainty: A Completely Positive Representation. - Natarajan, Karthik; Teo, Chung-Piaw; Zheng, Zhichao (Oper. Res., 2011)

Towards greener wireless transmission: Efficient power amplifier design. - Natarajan, Karthik; Yoo, Sang-Min; Allstot, David J.; Walling, Jeffrey S. (2011)

An analysis of clinical queries in an electronic health record search utility. - Natarajan, Karthik; Stein, Daniel M.; Jain, Samat; Elhadad, Noemie (Int. J. Medical Informatics, 2010)

A Current Reuse Quadrature GPS Receiver in 0.13 μ m CMOS. - Cheng, Kuang-Wei; Natarajan, Karthik; Allstot, David J. (IEEE J. Solid State Circuits, 2010)

Models for Minimax Stochastic Linear Optimization Problems with Risk Aversion. - Bertsimas, Dimitris; Doan, Xuan Vinh; Natarajan, Karthik; Teo, Chung-Piaw (Math. Oper. Res., 2010)

Constructing Risk Measures from Uncertainty Sets. - Natarajan, Karthik; Pachamanova, Dessislava; Sim, Melvyn (Oper. Res., 2009)

Persistency Model and Its Applications in Choice Modeling. - Natarajan, Karthik; Song, Miao; Teo, Chung-Piaw (Manag. Sci., 2009)

A 7.2mW quadrature GPS receiver in 0.13µm CMOS. - Cheng, Kuang-Wei; Natarajan, Karthik; Allstot, David J. (2009)

Incorporating Asymmetric Distributional Information in Robust Value-at-Risk Optimization. - Natarajan, Karthik; Pachamanova, Dessislava; Sim, Melvyn (Manag. Sci., 2008)

Redesigning electronic health record systems to support public health. - Kukafka, Rita; Ancker, Jessica S.; Chan, Connie V.; Chelico, John; Khan, Sharib A.; Mortoti, Selasie; Natarajan, Karthik; Presley, Kempton; Stephens, Kayann (J. Biomed. Informatics, 2007)

A semidefinite optimization approach to the steady-state analysis of queueing systems. - Bertsimas, Dimitris; Natarajan, Karthik (Queueing Syst. Theory Appl., 2007)

Persistence in discrete optimization under data uncertainty. - Bertsimas, Dimitris; Natarajan, Karthik; Teo, Chung-Piaw (Math. Program., 2006)

Probabilistic Combinatorial Optimization: Moments, Semidefinite Programming, and Asymptotic Bounds. - Bertsimas, Dimitris; Natarajan, Karthik; Teo, Chung-Piaw (SIAM J. Optim., 2004)

Microprocessor pipeline energy analysis. - Natarajan, Karthik; Hanson, Heather; Keckler, Stephen W.; Moore, Charles R.; Burger, Doug (2003)