Karthik Natarajan

Publication Activity (10 Years)

Years Active: 2003-2024
Publications (10 Years): 63

Top Topics

Combinatorial Optimization

Top Venues

J. Am. Medical Informatics Assoc.

Publications

Chao Pang, Xinzhuo Jiang, Nishanth Parameshwar Pavinkurve, Krishna S. Kalluri, Elise L. Minto, Jason Patterson, Linying Zhang, George Hripcsak, Noémie Elhadad, Karthik Natarajan
CEHR-GPT: Generating Electronic Health Records with Chronological Patient Timelines. CoRR (2024)
Andrew Guide, Lina Sulieman, Shawn Garbett, Robert M. Cronin, Matthew E. Spotnitz, Karthik Natarajan, Robert J. Carroll, Paul A. Harris, Qingxia Chen
Identifying erroneous height and weight values from adult electronic health records in the All of Us research program. J. Biomed. Informatics 155 (2024)
Arjun Kodagehalli Ramachandra, Karthik Natarajan
Tight Probability Bounds with Pairwise Independence. SIAM J. Discret. Math. 37 (2) (2023)
Casey N. Ta, Jason E. Zucker, Po-Hsiang Chiu, Yilu Fang, Karthik Natarajan, Chunhua Weng
Clinical and temporal characterization of COVID-19 subgroups using patient vector embeddings of electronic health records. J. Am. Medical Informatics Assoc. 30 (2) (2023)
Vipina Kuttichi Keloth, Juan M. Banda, Michael J. Gurley, Paul M. Heider, Georgina Kennedy, Hongfang Liu, Feifan Liu, Timothy A. Miller, Karthik Natarajan, Olga V. Patterson, Yifan Peng, Kalpana Raja, Ruth M. Reeves, Masoud Rouhizadeh, Jianlin Shi, Xiaoyan Wang, Yanshan Wang, Wei-Qi Wei, Andrew E. Williams, Rui Zhang, Rimma Belenkaya, Christian G. Reich, Clair Blacketer, Patrick B. Ryan, George Hripcsak, Noémie Elhadad, Hua Xu
Representing and utilizing clinical textual data for real world studies: An OHDSI approach. J. Biomed. Informatics 142 (2023)
Karthik Natarajan, Chunhua Weng, Soumitra Sengupta
A Model for Multi-Institutional Clinical Data Repository. MIE (2023)
Karthik Natarajan, Arjun Ramachandra, Colin Tan
 - 1)-wise independence. Oper. Res. Lett. 51 (1) (2023)
Bahar Taskesen, Soroosh Shafieezadeh-Abadeh, Daniel Kuhn, Karthik Natarajan
Discrete Optimal Transport with Independent Marginals is #P-Hard. SIAM J. Optim. 33 (2) (2023)
Yanqiu Ruan, Xiaobo Li, Karthyek Murthy, Karthik Natarajan
A Nonparametric Approach with Marginals for Modeling Consumer Choice. EC (2023)
Bahar Taskesen, Soroosh Shafieezadeh-Abadeh, Daniel Kuhn, Karthik Natarajan
Discrete Optimal Transport with Independent Marginals is #P-Hard. CoRR (2022)
Divya Padmanabhan, Selin Damla Ahipasaoglu, Arjun Kodagehalli Ramachandra, Karthik Natarajan
Extremal Probability Bounds in Combinatorial Optimization. SIAM J. Optim. 32 (4) (2022)
Louis Chen, Will Ma, Karthik Natarajan, David Simchi-Levi, Zhenzhen Yan
Distributionally Robust Linear and Discrete Optimization with Marginals. Oper. Res. 70 (3) (2022)
Xinzhuo Jiang, Maura Beaton, Jake Gillberg, Andrew Williams, Karthik Natarajan
Feasibility of Linking Area Deprivation Index Data to the OMOP Common Data Model. AMIA (2022)
Sylvia Cho, Ipek Ensari, Noémie Elhadad, Chunhua Weng, Jennifer M. Radin, Brinnae Bent, Pooja M. Desai, Karthik Natarajan
An interactive fitness-for-use data completeness tool to assess activity tracker data. J. Am. Medical Informatics Assoc. 29 (12) (2022)
Hiral Master, Lina Sulieman, Paul A. Harris, Karthik Natarajan, Robert J. Carroll, Kayla Marginean, Kelsey R. Mayo, Aymone Kouame, Michael Lyons
Self-paced Training Modality to Promote the Use of All of Us Researcher Workbench in Educational and Research Settings. AMIA (2022)
Andrea H. Ramirez, Lina M. Sulieman, David J. Schlueter, Alese E. Halvorson, Jun Qian, Francis Ratsimbazafy, Roxana Loperena-Cortes, Kelsey R. Mayo, Melissa A. Basford, Nicole Deflaux, Karthik Muthuraman, Karthik Natarajan, Abel N. Kho, Hua Xu, Consuelo H. Wilkins, Hoda Anton-Culver, Eric Boerwinkle, Mine Cicek, Cheryl R. Clark, Elizabeth Cohn, Lucila Ohno-Machado, Sheri D. Schully, Brian K. Ahmedani, Maria Argos, Robert M. Cronin, Christopher J. O'Donnell, Mona Fouad, David B. Goldstein, Philip Greenland, Scott J. Hebbring, Elizabeth W. Karlson, Parinda Khatri, Bruce Korf, Jordan W. Smoller, Stephen Sodeke, John Wilbanks, Justin Hentges, Stephen Mockrin, Christopher Lunt, Stephanie A. Devaney, Kelly Gebo, Joshua C. Denny, Robert J. Carroll, David Glazer, Paul A. Harris, George Hripcsak, Anthony Philippakis, Dan M. Roden
Research Program: Data quality, utility, and diversity. Patterns 3 (8) (2022)
Nripendra D. Acharya, Harry Reyes Nieva, Karthik Natarajan
Analyzing healthcare-seeking behavior among All of Us enrollees in the era of COVID-19. AMIA (2022)
Lina M. Sulieman, Robert M. Cronin, Robert J. Carroll, Karthik Natarajan, Kayla Marginean, Brandy Mapes, Dan M. Roden, Paul A. Harris, Andrea H. Ramirez
Research Program. J. Am. Medical Informatics Assoc. 29 (7) (2022)
Arjun Ramachandra, Karthik Natarajan
Submodularity and pairwise independence. CoRR (2022)
Zhenzhen Yan, Karthik Natarajan, Chung-Piaw Teo, Cong Cheng
A Representative Consumer Model in Data-Driven Multiproduct Pricing Optimization. Manag. Sci. 68 (8) (2022)
Matthew E. Spotnitz, Jason Patterson, Vojtech Huser, Chunhua Weng, Karthik Natarajan
Harmonization of Measurement Codes for Concept-Oriented Lab Data Retrieval. AMIA (2021)
Salvatore G. Volpe, Karthik Natarajan
REDHot OMOP: Facilitating Semantic Interoperability in REDCap with FHIR and the OMOP CDM. AMIA (2021)
Chao Pang, Xinzhuo Jiang, Krishna S. Kalluri, Matthew E. Spotnitz, Ruijun Chen, Adler J. Perotte, Karthik Natarajan
CEHR-BERT: Incorporating temporal information from structured EHR data to improve prediction tasks. ML4H@NeurIPS (2021)
Sylvia Cho, Karthik Natarajan
Designing a Data Quality Characterization Tool for Fitness Tracker Data. AMIA (2021)
Jianfu Li, Yujia Zhou, Xiaoqian Jiang, Karthik Natarajan, Serguei V. S. Pakhomov, Hongfang Liu, Hua Xu
Are synthetic clinical notes useful for real natural language processing tasks: A case study on clinical entity recognition. J. Am. Medical Informatics Assoc. 28 (10) (2021)
Divya Padmanabhan, Karthik Natarajan
Tree Bounds for Sums of Bernoulli Random Variables: A Linear Optimization Approach. INFORMS J. Optim. 3 (1) (2021)
Matthew E. Spotnitz, Jason Patterson, Vojtech Huser, Chunhua Weng, Karthik Natarajan
Harmonization of Measurement Codes for Concept-Oriented Lab Data Retrieval. MedInfo (2021)
Ashley B. Stephens, Chelsea S. Wynn, Annika M. Hofstetter, Chelsea Kolff, Oscar Pena, Eric Kahn, Balendu Dasgupta, Karthik Natarajan, David K. Vawdrey, Mariellen M. Lane, Laura Robbins-Milne, Rajasekhar Ramakrishnan, Stephen Holleran, Melissa S. Stockwell
Effect of Electronic Health Record Reminders for Routine Immunizations and Immunizations Needed for Chronic Medical Conditions. Appl. Clin. Inform. 12 (5) (2021)
Melissa A. Haendel, Christopher G. Chute, Tellen D. Bennett, David A. Eichmann, Justin Guinney, Warren A. Kibbe, Philip R. O. Payne, Emily R. Pfaff, Peter N. Robinson, Joel H. Saltz, Heidi Spratt, Christine Suver, John Wilbanks, Adam B. Wilcox, Andrew E. Williams, Chunlei Wu, Clair Blacketer, Robert L. Bradford, James J. Cimino, Marshall Clark, Evan W. Colmenares, Patricia A. Francis, Davera Gabriel, Alexis Graves, Raju Hemadri, Stephanie S. Hong, George Hripcsak, Dazhi Jiao, Jeffrey G. Klann, Kristin Kostka, Adam M. Lee, Harold P. Lehmann, Lora Lingrey, Robert T. Miller, Michele Morris, Shawn N. Murphy, Karthik Natarajan, Matvey B. Palchuk, Usman Sheikh, Harold Solbrig, Shyam Visweswaran, Anita Walden, Kellie M. Walters, Griffin M. Weber, Xiaohan Tanner Zhang, Richard L. Zhu, Benjamin Amor, Andrew T. Girvin, Amin Manna, Nabeel Qureshi, Michael G. Kurilla, Sam G. Michael, Lili M. Portilla, Joni L. Rutter, Christopher P. Austin, Ken R. Gersing
The National COVID Cohort Collaborative (N3C): Rationale, design, infrastructure, and deployment. J. Am. Medical Informatics Assoc. 28 (3) (2021)
Anulekha Dhara, Bikramjit Das, Karthik Natarajan
Worst-Case Expected Shortfall with Univariate and Bivariate Marginals. INFORMS J. Comput. 33 (1) (2021)
Lina Sulieman, Karthik Natarajan, Qingxia Chen, Robert J. Carroll, Kayla Marginean, Paul A. Harris, Andrea H. Ramirez
Measuring the correctness of All of Us physical measurement. AMIA (2021)
Victor Alfonso Rodriguez, Shreyas Bhave, Ruijun Chen, Chao Pang, George Hripcsak, Soumitra Sengupta, Noemie Elhadad, Robert A. Green, Jason S. Adelman, Katherine Schlosser Metitiri, Pierre Elias, Holden Groves, Sumit Mohan, Karthik Natarajan, Adler J. Perotte
Development and validation of prediction models for mechanical ventilation, renal replacement therapy, and readmission in COVID-19 patients. J. Am. Medical Informatics Assoc. 28 (7) (2021)
Chao Pang, Xinzhuo Jiang, Krishna S. Kalluri, Matthew E. Spotnitz, Ruijun Chen, Adler J. Perotte, Karthik Natarajan
CEHR-BERT: Incorporating temporal information from structured EHR data to improve prediction tasks. CoRR (2021)
Divya Padmanabhan, Karthik Natarajan, Karthyek Murthy
Exploiting partial correlations in distributionally robust optimization. Math. Program. 186 (1) (2021)
Bikramjit Das, Anulekha Dhara, Karthik Natarajan
On the Heavy-Tail Behavior of the Distributionally Robust Newsvendor. Oper. Res. 69 (4) (2021)
Milu Mary Philip, Karthik Natarajan, Anithkumar Ramanathan, Vijayakumar Balakrishnan
Composite pattern to handle variation points in software architectural design of evolving application systems. IET Softw. 14 (2) (2020)
Xu Zuo, Jianfu Li, Bo Zhao, Yujia Zhou, Xiao Dong, Jon D. Duke, Karthik Natarajan, George Hripcsak, Nigam Shah, Juan M. Banda, Ruth M. Reeves, Hua Xu
Normalizing Clinical Document Titles to LOINC Document Ontology: an Initial Study. AMIA (2020)
Chao Pang, Ruijun Chen, Harry Reyes Nieva, Krishna Kalluri, Tony Sun, Xinzhuo Jiang, Victor Alfonso Rodriguez, Patrick B. Ryan, Karthik Natarajan
Characterization and Comparison of Embedding Algorithms for Phenotyping across a Network of Observational Databases. AMIA (2020)
Vojtech Huser, Clair Blacketer, Karthik Natarajan, Robert T. Miller, Andrew Williams, Selva Muthu Kumaran Sathappan, José D. Posada, Nigam Shah
Data Quality Assessment of Laboratory Data. AMIA (2020)
Anna Ostropolets, Christian G. Reich, Patrick B. Ryan, Chunhua Weng, Anthony Molinaro, Frank J. DeFalco, Jitendra Jonnagaddala, Siaw-Teng Liaw, Hokyun Jeon, Rae Woong Park, Matthew E. Spotnitz, Karthik Natarajan, Kristin Kostka, George Argyriou, Robert T. Miller, Andrew E. Williams, Evan Minty, José D. Posada, George Hripcsak
Characterizing database granularity using SNOMED-CT hierarchy. AMIA (2020)
Nicole Gray Weiskopf, Melody L. Greer, Karthik Natarajan, Caroline A. Thompson, Harold P. Lehmann
Bias in the Reuse and Analysis of Electronic Health Record Data. AMIA (2020)
Louis Chen, Divya Padmanabhan, Chee Chin Lim, Karthik Natarajan
Correlation Robust Influence Maximization. CoRR (2020)
Louis Chen, Divya Padmanabhan, Chee Chin Lim, Karthik Natarajan
Correlation Robust Influence Maximization. NeurIPS (2020)
Sylvia Cho, Karthik Natarajan
Identifying Use Cases of Consumer-Grade Fitness Trackers in Research Studies. AMIA (2020)
Sylvia Cho, Margaret Sin, Demetra S. Tsapepas, Leigh-Anne Dale, Syed A. Husain, Sumit Mohan, Karthik Natarajan
Content Coverage Evaluation of the OMOP Vocabulary on the Transplant Domain Focusing on Concepts Relevant for Kidney Transplant Outcomes Analysis. Appl. Clin. Inform. 11 (04) (2020)
Michelle Holko, Francis Ratsimbazafy, Kayla Marginean, Karthik Natarajan, Sylvia Cho, Josh Schilling, Aymone Kouame, Dan Webster, Shaquille Peters, Mark Begale, Kelly Gebo, Andrea H. Ramirez, Paul A. Harris
Fitbit "Bring Your Own Device" data in the All of Us Research Program. AMIA (2020)
Victor Alfonso Rodriguez, Tony Sun, Phyllis Thangaraj, Chao Pang, Krishna Kalluri, Xinzhuo Jiang, Karthik Natarajan, Patrick B. Ryan, Anna Ostropolets, Ruijun Chen
Phenotype Concept Set Construction from Concept Pair Likelihoods. AMIA (2020)
Xiao Dong, Jianfu Li, Ekin Soysal, Jiang Bian, Scott L. DuVall, Elizabeth Hanchrow, Hongfang Liu, Kristine E. Lynch, Michael E. Matheny, Karthik Natarajan, Lucila Ohno-Machado, Serguei Pakhomov, Ruth Madeleine Reeves, Amy M. Sitapati, Swapna Abhyankar, Theresa Cullen, Jami Deckard, Xiaoqian Jiang, Robert Murphy, Hua Xu
COVID-19 TestNorm: A tool to normalize COVID-19 testing names to LOINC codes. J. Am. Medical Informatics Assoc. 27 (9) (2020)
Karthik Natarajan, Robert J. Carroll, Thomas R. Campion Jr., Joan Grand, Shyam Visweswaran
Curating EHR data in the All of Us Research Program. AMIA (2019)
Selin Damla Ahipasaoglu, Xiaobo Li, Karthik Natarajan
A Convex Optimization Approach for Computing Correlated Choice Probabilities With Many Alternatives. IEEE Trans. Autom. Control. 64 (1) (2019)
George Hripcsak, Ning Shang, Peggy L. Peissig, Luke V. Rasmussen, Cong Liu, Barbara Benoit, Robert J. Carroll, David S. Carrell, Joshua C. Denny, Ozan Dikilitas, Vivian S. Gainer, Kayla Marie Howell, Jeffrey G. Klann, Iftikhar J. Kullo, Todd Lingren, Frank D. Mentch, Shawn N. Murphy, Karthik Natarajan, Chunhua Weng
Facilitating phenotype transfer using a common data model. J. Biomed. Informatics 96 (2019)
Vojtech Huser, Xiaochun Li, Zuoyi Zhang, Sungjae Jung, Rae Woong Park, Juan M. Banda, Hanieh Razzaghi, Ajit Londhe, Karthik Natarajan
Extending Achilles Heel Data Quality Tool with New Rules Informed by Multi-Site Data Quality Comparison. MedInfo (2019)
Selin Damla Ahipasaoglu, Karthik Natarajan, Dongjian Shi
Distributionally robust project crashing with partial or no correlation information. Networks 74 (1) (2019)
Selin Damla Ahipasaoglu, Ugur Arikan, Karthik Natarajan
Distributionally Robust Markovian Traffic Equilibrium. Transp. Sci. 53 (6) (2019)
Karthik Natarajan, Dongjian Shi, Kim-Chuan Toh
Bounds for Random Binary Quadratic Programs. SIAM J. Optim. 28 (1) (2018)
Karthik Natarajan, Melvyn Sim, Joline Uichanco
Asymmetry and Ambiguity in Newsvendor Models. Manag. Sci. 64 (7) (2018)
Thomas L. Magnanti, Karthik Natarajan
Allocating Students to Multidisciplinary Capstone Projects Using Discrete Optimization. Interfaces 48 (3) (2018)
Ruijun Chen, Patrick B. Ryan, Karthik Natarajan, Thomas Falconer, Christian G. Reich, Rohit Vashisht, Nigam Shah, George Hripcsak
Treatment Pathways in Patients with Cancer Using a Large-scale Observational Data Network. AMIA (2018)
Robert J. Carroll, Joshua C. Mandel, Karthik Natarajan, Scott Sutherland, Joshua C. Denny
The Data and Research Center of the All of Us Research Program: Framework for a National Cohort Program and Research Opportunities. AMIA (2017)
Sylvia Cho, Margaret Sin, Karthik Natarajan
Evaluation of OMOP Vocabulary on Transplant Registry Data. AMIA (2017)
Anulekha Dhara, Karthik Natarajan
On the polynomial solvability of distributionally robust k-sum optimization. Optim. Methods Softw. 32 (4) (2017)
Karthik Natarajan, Chung-Piaw Teo
On reduced semidefinite programs for second order moment bounds with applications. Math. Program. 161 (1-2) (2017)
Zhichao Zheng, Karthik Natarajan, Chung-Piaw Teo
Least Squares Approximation to the Distribution of Project Completion Times with Gaussian Uncertainty. Oper. Res. 64 (6) (2016)
Xuan Vinh Doan, Xiaobo Li, Karthik Natarajan
Robustness to Dependency in Portfolio Optimization Using Overlapping Marginals. Oper. Res. 63 (6) (2015)
Vinit Kumar Mishra, Karthik Natarajan, Dhanesh Padmanabhan, Chung-Piaw Teo, Xiaobo Li
On Theoretical and Empirical Aspects of Marginal Distribution Choice Models. Manag. Sci. 60 (6) (2014)
Karthik Natarajan, Dongjian Shi, Kim-Chuan Toh
A Probabilistic Model for Minmax Regret in Combinatorial Optimization. Oper. Res. 62 (1) (2014)
Daibashish Gangopadhyay, Emily G. Allstot, Anna M. R. Dixon, Karthik Natarajan, Subhanshu Gupta, David J. Allstot
Compressed Sensing Analog Front-End for Bio-Sensor Applications. IEEE J. Solid State Circuits 49 (2) (2014)
Adler J. Perotte, Rimma Pivovarov, Karthik Natarajan, Nicole Gray Weiskopf, Frank D. Wood, Noemie Elhadad
Diagnosis code assignment: models and evaluation metrics. J. Am. Medical Informatics Assoc. 21 (2) (2014)
Xiaobo Li, Karthik Natarajan, Chung-Piaw Teo, Zhichao Zheng
Distributionally robust mixed integer linear programs: Persistency models with applications. Eur. J. Oper. Res. 233 (3) (2014)
David K. Vawdrey, Karthik Natarajan, Andrew S. Kanter, George Hripcsak, Gilad J. Kuperman, Melissa S. Stockwell
Informatics Lessons from Using a Novel Immunization Information System. MedInfo (2013)
Flora S. Tsai, Karthik Natarajan, Selin Damla Ahipasaoglu, Chau Yuen, Hyowon Lee, Ngai-Man Cheung, Justin Ruths, Shisheng Huang, Thomas L. Magnanti
From Boxes to bees: Active learning in freshmen calculus. EDUCON (2013)
Karthik Natarajan, Adam B. Wilcox, Niloo Sobhani, Aurelia Boyer
Analyzing Requests for Clinical Data for Self-Service Penetration. AMIA (2013)
Chun-Hung Chiu, Ngai-Hang Z. Leung, Karthik Natarajan
) inventory system. Oper. Res. Lett. 41 (1) (2013)
Vinit Kumar Mishra, Karthik Natarajan, Hua Tao, Chung-Piaw Teo
Choice Prediction With Semidefinite Optimization When Utilities are Correlated. IEEE Trans. Autom. Control. 57 (10) (2012)
Xuan Vinh Doan, Karthik Natarajan
On the Complexity of Nonoverlapping Multivariate Marginal Bounds for Probabilistic Combinatorial Optimization Problems. Oper. Res. 60 (1) (2012)
Karthik Natarajan, Sang-Min Yoo, David J. Allstot, Jeffrey S. Walling
Towards greener wireless transmission: Efficient power amplifier design. IGCC (2011)
Karthik Natarajan, Chung-Piaw Teo, Zhichao Zheng
Mixed 0-1 Linear Programs Under Objective Uncertainty: A Completely Positive Representation. Oper. Res. 59 (3) (2011)
Kuang-Wei Cheng, Karthik Natarajan, David J. Allstot
A Current Reuse Quadrature GPS Receiver in 0.13 μ m CMOS. IEEE J. Solid State Circuits 45 (3) (2010)
Karthik Natarajan, Daniel M. Stein, Samat Jain, Noemie Elhadad
An analysis of clinical queries in an electronic health record search utility. Int. J. Medical Informatics 79 (7) (2010)
Dimitris Bertsimas, Xuan Vinh Doan, Karthik Natarajan, Chung-Piaw Teo
Models for Minimax Stochastic Linear Optimization Problems with Risk Aversion. Math. Oper. Res. 35 (3) (2010)
Kuang-Wei Cheng, Karthik Natarajan, David J. Allstot
A 7.2mW quadrature GPS receiver in 0.13µm CMOS. ISSCC (2009)
Karthik Natarajan, Miao Song, Chung-Piaw Teo
Persistency Model and Its Applications in Choice Modeling. Manag. Sci. 55 (3) (2009)
Karthik Natarajan, Dessislava Pachamanova, Melvyn Sim
Constructing Risk Measures from Uncertainty Sets. Oper. Res. 57 (5) (2009)
Karthik Natarajan, Dessislava Pachamanova, Melvyn Sim
Incorporating Asymmetric Distributional Information in Robust Value-at-Risk Optimization. Manag. Sci. 54 (3) (2008)
Dimitris Bertsimas, Karthik Natarajan
A semidefinite optimization approach to the steady-state analysis of queueing systems. Queueing Syst. Theory Appl. 56 (1) (2007)
Rita Kukafka, Jessica S. Ancker, Connie V. Chan, John Chelico, Sharib A. Khan, Selasie Mortoti, Karthik Natarajan, Kempton Presley, Kayann Stephens
Redesigning electronic health record systems to support public health. J. Biomed. Informatics 40 (4) (2007)
Dimitris Bertsimas, Karthik Natarajan, Chung-Piaw Teo
Persistence in discrete optimization under data uncertainty. Math. Program. 108 (2-3) (2006)
Dimitris Bertsimas, Karthik Natarajan, Chung-Piaw Teo
Probabilistic Combinatorial Optimization: Moments, Semidefinite Programming, and Asymptotic Bounds. SIAM J. Optim. 15 (1) (2004)
Karthik Natarajan, Heather Hanson, Stephen W. Keckler, Charles R. Moore, Doug Burger
Microprocessor pipeline energy analysis. ISLPED (2003)