Karthik Natarajan

According to our database, Karthik Natarajan authored at least 84 papers between 2003 and 2024.

Collaborative distances:

• Dijkstra number of four.
• Erdős number of three.

2024

CEHR-GPT: Generating Electronic Health Records with Chronological Patient Timelines.

Chao Pang, Xinzhuo Jiang, Nishanth Parameshwar Pavinkurve, Krishna S. Kalluri, Elise L. Minto, Jason Patterson, Linying Zhang, George Hripcsak, Noémie Elhadad, Karthik Natarajan

CoRR, 2024

2023

Tight Probability Bounds with Pairwise Independence.

Arjun Kodagehalli Ramachandra, Karthik Natarajan

SIAM J. Discret. Math., June, 2023

Representing and utilizing clinical textual data for real world studies: An OHDSI approach.

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

J. Biomed. Informatics, June, 2023

Probability bounds for <i>n</i> random events under (<i>n</i> - 1)-wise independence.

Karthik Natarajan, Arjun Kodagehalli Ramachandra, Colin Tan

Oper. Res. Lett., January, 2023

Clinical and temporal characterization of COVID-19 subgroups using patient vector embeddings of electronic health records.

Casey N. Ta, Jason E. Zucker, Po-Hsiang Chiu, Yilu Fang, Karthik Natarajan, Chunhua Weng

J. Am. Medical Informatics Assoc., January, 2023

Discrete Optimal Transport with Independent Marginals is #P-Hard.

Bahar Taskesen, Soroosh Shafieezadeh-Abadeh, Daniel Kuhn, Karthik Natarajan

SIAM J. Optim., 2023

A Nonparametric Approach with Marginals for Modeling Consumer Choice.

Yanqiu Ruan, Xiaobo Li, Karthyek Murthy, Karthik Natarajan

Proceedings of the 24th ACM Conference on Economics and Computation, 2023

A Model for Multi-Institutional Clinical Data Repository.

Karthik Natarajan, Chunhua Weng, Soumitra Sengupta

Proceedings of the Caring is Sharing - Exploiting the Value in Data for Health and Innovation - Proceedings of MIE 2023, Gothenburg, Sweden, 22, 2023

2022

Extremal Probability Bounds in Combinatorial Optimization.

Divya Padmanabhan, Selin Damla Ahipasaoglu, Arjun Kodagehalli Ramachandra, Karthik Natarajan

SIAM J. Optim., December, 2022

The <i>All of Us</i> Research Program: Data quality, utility, and diversity.

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 A. Philippakis, Dan M. Roden

Patterns, 2022

A Representative Consumer Model in Data-Driven Multiproduct Pricing Optimization.

Zhenzhen Yan, Karthik Natarajan, Chung-Piaw Teo, Cong Cheng

Manag. Sci., 2022

Comparing medical history data derived from electronic health records and survey answers in the <i>All of Us</i> Research Program.

Lina M. Sulieman, Robert M. Cronin, Robert J. Carroll, Karthik Natarajan, Kayla Marginean, Brandy Mapes, Dan M. Roden, Paul A. Harris, Andrea H. Ramirez

J. Am. Medical Informatics Assoc., 2022

An interactive fitness-for-use data completeness tool to assess activity tracker data.

Sylvia Cho, Ipek Ensari, Noémie Elhadad, Chunhua Weng, Jennifer M. Radin, Brinnae Bent, Pooja M. Desai, Karthik Natarajan

J. Am. Medical Informatics Assoc., 2022

Distributionally Robust Linear and Discrete Optimization with Marginals.

Louis Chen, Will Ma, Karthik Natarajan, David Simchi-Levi, Zhenzhen Yan

Oper. Res., 2022

Submodularity and pairwise independence.

Arjun Kodagehalli Ramachandra, Karthik Natarajan

CoRR, 2022

Self-paced Training Modality to Promote the Use of All of Us Researcher Workbench in Educational and Research Settings.

Hiral Master, Lina Sulieman, Paul A. Harris, Karthik Natarajan, Robert J. Carroll, Kayla Marginean, Kelsey R. Mayo, Aymone Kouame, Michael Lyons

Proceedings of the AMIA 2022, 2022

Feasibility of Linking Area Deprivation Index Data to the OMOP Common Data Model.

Xinzhuo Jiang, Maura Beaton, Jake Gillberg, Andrew Williams, Karthik Natarajan

Proceedings of the AMIA 2022, 2022

Analyzing healthcare-seeking behavior among All of Us enrollees in the era of COVID-19.

Nripendra D. Acharya, Harry Reyes Nieva, Karthik Natarajan

Proceedings of the AMIA 2022, 2022

2021

Tree Bounds for Sums of Bernoulli Random Variables: A Linear Optimization Approach.

Divya Padmanabhan, Karthik Natarajan

INFORMS J. Optim., January, 2021

Exploiting partial correlations in distributionally robust optimization.

Divya Padmanabhan, Karthik Natarajan, Karthyek Murthy

Math. Program., 2021

Development and validation of prediction models for mechanical ventilation, renal replacement therapy, and readmission in COVID-19 patients.

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

J. Am. Medical Informatics Assoc., 2021

Are synthetic clinical notes useful for real natural language processing tasks: A case study on clinical entity recognition.

Jianfu Li, Yujia Zhou, Xiaoqian Jiang, Karthik Natarajan, Serguei V. S. Pakhomov, Hongfang Liu, Hua Xu

J. Am. Medical Informatics Assoc., 2021

The National COVID Cohort Collaborative (N3C): Rationale, design, infrastructure, and deployment.

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 R. C. 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

J. Am. Medical Informatics Assoc., 2021

On the Heavy-Tail Behavior of the Distributionally Robust Newsvendor.

Bikramjit Das, Anulekha Dhara, Karthik Natarajan

Oper. Res., 2021

Worst-Case Expected Shortfall with Univariate and Bivariate Marginals.

Anulekha Dhara, Bikramjit Das, Karthik Natarajan

INFORMS J. Comput., 2021

Effect of Electronic Health Record Reminders for Routine Immunizations and Immunizations Needed for Chronic Medical Conditions.

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

Appl. Clin. Inform., 2021

CEHR-BERT: Incorporating temporal information from structured EHR data to improve prediction tasks.

Chao Pang, Xinzhuo Jiang, Krishna S. Kalluri, Matthew E. Spotnitz, Ruijun Chen, Adler J. Perotte, Karthik Natarajan

Proceedings of the Machine Learning for Health, 2021

Harmonization of Measurement Codes for Concept-Oriented Lab Data Retrieval.

Matthew E. Spotnitz, Jason Patterson, Vojtech Huser, Chunhua Weng, Karthik Natarajan

Proceedings of the MEDINFO 2021: One World, One Health - Global Partnership for Digital Innovation, 2021

REDHot OMOP: Facilitating Semantic Interoperability in REDCap with FHIR and the OMOP CDM.

Salvatore G. Volpe, Karthik Natarajan

Proceedings of the AMIA 2021, American Medical Informatics Association Annual Symposium, San Diego, CA, USA, October 30, 2021, 2021

Measuring the correctness of All of Us physical measurement.

Lina Sulieman, Karthik Natarajan, Qingxia Chen, Robert J. Carroll, Kayla Marginean, Paul A. Harris, Andrea H. Ramirez

Proceedings of the AMIA 2021, American Medical Informatics Association Annual Symposium, San Diego, CA, USA, October 30, 2021, 2021

Designing a Data Quality Characterization Tool for Fitness Tracker Data.

Sylvia Cho, Karthik Natarajan

Proceedings of the AMIA 2021, American Medical Informatics Association Annual Symposium, San Diego, CA, USA, October 30, 2021, 2021

2020

COVID-19 TestNorm: A tool to normalize COVID-19 testing names to LOINC codes.

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

J. Am. Medical Informatics Assoc., 2020

Composite pattern to handle variation points in software architectural design of evolving application systems.

Milu Mary Philip, Karthik Natarajan, Anithkumar Ramanathan, Vijayakumar Balakrishnan

IET Softw., 2020

Content Coverage Evaluation of the OMOP Vocabulary on the Transplant Domain Focusing on Concepts Relevant for Kidney Transplant Outcomes Analysis.

Sylvia Cho, Margaret Sin, Demetra S. Tsapepas, Leigh-Anne Dale, Syed A. Husain, Sumit Mohan, Karthik Natarajan

Appl. Clin. Inform., 2020

Correlation Robust Influence Maximization.

Louis Chen, Divya Padmanabhan, Chee Chin Lim, Karthik Natarajan

Proceedings of the Advances in Neural Information Processing Systems 33: Annual Conference on Neural Information Processing Systems 2020, 2020

Normalizing Clinical Document Titles to LOINC Document Ontology: an Initial Study.

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

Proceedings of the AMIA 2020, 2020

Bias in the Reuse and Analysis of Electronic Health Record Data.

Nicole Gray Weiskopf, Melody L. Greer, Karthik Natarajan, Caroline A. Thompson, Harold P. Lehmann

Proceedings of the AMIA 2020, 2020

Phenotype Concept Set Construction from Concept Pair Likelihoods.

Victor Alfonso Rodriguez, Tony Sun, Phyllis Thangaraj, Chao Pang, Krishna Kalluri, Xinzhuo Jiang, Karthik Natarajan, Patrick B. Ryan, Anna Ostropolets, Ruijun Chen

Proceedings of the AMIA 2020, 2020

Characterization and Comparison of Embedding Algorithms for Phenotyping across a Network of Observational Databases.

Chao Pang, Ruijun Chen, Harry Reyes Nieva, Krishna Kalluri, Tony Sun, Xinzhuo Jiang, Victor Alfonso Rodriguez, Patrick B. Ryan, Karthik Natarajan

Proceedings of the AMIA 2020, 2020

Characterizing database granularity using SNOMED-CT hierarchy.

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

Proceedings of the AMIA 2020, 2020

Data Quality Assessment of Laboratory Data.

Vojtech Huser, Clair Blacketer, Karthik Natarajan, Robert T. Miller, Andrew Williams, Selva Muthu Kumaran Sathappan, José D. Posada, Nigam Shah

Proceedings of the AMIA 2020, 2020

Fitbit "Bring Your Own Device" data in the All of Us Research Program.

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

Proceedings of the AMIA 2020, 2020

Identifying Use Cases of Consumer-Grade Fitness Trackers in Research Studies.

Sylvia Cho, Karthik Natarajan

Proceedings of the AMIA 2020, 2020

2019

Distributionally Robust Markovian Traffic Equilibrium.

Selin Damla Ahipasaoglu, Ugur Arikan, Karthik Natarajan

Transp. Sci., 2019

A Convex Optimization Approach for Computing Correlated Choice Probabilities With Many Alternatives.

Selin Damla Ahipasaoglu, Xiaobo Li, Karthik Natarajan

IEEE Trans. Autom. Control., 2019

Distributionally robust project crashing with partial or no correlation information.

Selin Damla Ahipasaoglu, Karthik Natarajan, Dongjian Shi

Networks, 2019

Facilitating phenotype transfer using a common data model.

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

J. Biomed. Informatics, 2019

Extending Achilles Heel Data Quality Tool with New Rules Informed by Multi-Site Data Quality Comparison.

Vojtech Huser, Xiaochun Li, Zuoyi Zhang, Sungjae Jung, Rae Woong Park, Juan M. Banda, Hanieh Razzaghi, Ajit Londhe, Karthik Natarajan

Proceedings of the MEDINFO 2019: Health and Wellbeing e-Networks for All, 2019

Curating EHR data in the All of Us Research Program.

Karthik Natarajan, Robert J. Carroll, Thomas R. Campion Jr., Joan Grand, Shyam Visweswaran

Proceedings of the AMIA 2019, 2019

2018

Bounds for Random Binary Quadratic Programs.

Karthik Natarajan, Dongjian Shi, Kim-Chuan Toh

SIAM J. Optim., 2018

Asymmetry and Ambiguity in Newsvendor Models.

Karthik Natarajan, Melvyn Sim, Joline Uichanco

Manag. Sci., 2018

Allocating Students to Multidisciplinary Capstone Projects Using Discrete Optimization.

Thomas L. Magnanti, Karthik Natarajan

Interfaces, 2018

Treatment Pathways in Patients with Cancer Using a Large-scale Observational Data Network.

Ruijun Chen, Patrick B. Ryan, Karthik Natarajan, Thomas Falconer, Christian G. Reich, Rohit Vashisht, Nigam Shah, George Hripcsak

Proceedings of the AMIA 2018, 2018

2017

On the polynomial solvability of distributionally robust k-sum optimization.

Anulekha Dhara, Karthik Natarajan

Optim. Methods Softw., 2017

On reduced semidefinite programs for second order moment bounds with applications.

Karthik Natarajan, Chung-Piaw Teo

Math. Program., 2017

Evaluation of OMOP Vocabulary on Transplant Registry Data.

Sylvia Cho, Margaret Sin, Karthik Natarajan

Proceedings of the AMIA 2017, 2017

The Data and Research Center of the All of Us Research Program: Framework for a National Cohort Program and Research Opportunities.

Robert J. Carroll, Joshua C. Mandel, Karthik Natarajan, Scott Sutherland, Joshua C. Denny

Proceedings of the AMIA 2017, 2017

2016

Least Squares Approximation to the Distribution of Project Completion Times with Gaussian Uncertainty.

Zhichao Zheng, Karthik Natarajan, Chung-Piaw Teo

Oper. Res., 2016

2015

Robustness to Dependency in Portfolio Optimization Using Overlapping Marginals.

Xuan Vinh Doan, Xiaobo Li, Karthik Natarajan

Oper. Res., 2015

2014

On Theoretical and Empirical Aspects of Marginal Distribution Choice Models.

Vinit Kumar Mishra, Karthik Natarajan, Dhanesh Padmanabhan, Chung-Piaw Teo, Xiaobo Li

Manag. Sci., 2014

Compressed Sensing Analog Front-End for Bio-Sensor Applications.

Daibashish Gangopadhyay, Emily G. Allstot, Anna M. R. Dixon, Karthik Natarajan, Subhanshu Gupta, David J. Allstot

IEEE J. Solid State Circuits, 2014

Diagnosis code assignment: models and evaluation metrics.

Adler J. Perotte, Rimma Pivovarov, Karthik Natarajan, Nicole Gray Weiskopf, Frank D. Wood, Noemie Elhadad

J. Am. Medical Informatics Assoc., 2014

A Probabilistic Model for Minmax Regret in Combinatorial Optimization.

Karthik Natarajan, Dongjian Shi, Kim-Chuan Toh

Oper. Res., 2014

Distributionally robust mixed integer linear programs: Persistency models with applications.

Xiaobo Li, Karthik Natarajan, Chung-Piaw Teo, Zhichao Zheng

Eur. J. Oper. Res., 2014

2013

New analytical bounds on the average undershoot in an infinite horizon (<i>s</i>, <i>S</i>) inventory system.

Chun-Hung Chiu, Ngai-Hang Z. Leung, Karthik Natarajan

Oper. Res. Lett., 2013

Informatics Lessons from Using a Novel Immunization Information System.

David K. Vawdrey, Karthik Natarajan, Andrew S. Kanter, George Hripcsak, Gilad J. Kuperman, Melissa S. Stockwell

Proceedings of the MEDINFO 2013, 2013

From Boxes to bees: Active learning in freshmen calculus.

Flora S. Tsai, Karthik Natarajan, Selin Damla Ahipasaoglu, Chau Yuen, Hyowon Lee, Ngai-Man Cheung, Justin Ruths, Shisheng Huang, Thomas L. Magnanti

Proceedings of the IEEE Global Engineering Education Conference, 2013

Analyzing Requests for Clinical Data for Self-Service Penetration.

Karthik Natarajan, Adam B. Wilcox, Niloo Sobhani, Aurelia Boyer

Proceedings of the AMIA 2013, 2013

2012

Choice Prediction With Semidefinite Optimization When Utilities are Correlated.

Vinit Kumar Mishra, Karthik Natarajan, Hua Tao, Chung-Piaw Teo

IEEE Trans. Autom. Control., 2012

On the Complexity of Nonoverlapping Multivariate Marginal Bounds for Probabilistic Combinatorial Optimization Problems.

Xuan Vinh Doan, Karthik Natarajan

Oper. Res., 2012

2011

Mixed 0-1 Linear Programs Under Objective Uncertainty: A Completely Positive Representation.

Karthik Natarajan, Chung-Piaw Teo, Zhichao Zheng

Oper. Res., 2011

Towards greener wireless transmission: Efficient power amplifier design.

Karthik Natarajan, Sang-Min Yoo, David J. Allstot, Jeffrey S. Walling

Proceedings of the 2011 International Green Computing Conference and Workshops, 2011

2010

Models for Minimax Stochastic Linear Optimization Problems with Risk Aversion.

Dimitris Bertsimas, Xuan Vinh Doan, Karthik Natarajan, Chung-Piaw Teo

Math. Oper. Res., 2010

A Current Reuse Quadrature GPS Receiver in 0.13 μ m CMOS.

Kuang-Wei Cheng, Karthik Natarajan, David J. Allstot

IEEE J. Solid State Circuits, 2010

An analysis of clinical queries in an electronic health record search utility.

Karthik Natarajan, Daniel M. Stein, Samat Jain, Noemie Elhadad

Int. J. Medical Informatics, 2010

2009

Persistency Model and Its Applications in Choice Modeling.

Karthik Natarajan, Miao Song, Chung-Piaw Teo

Manag. Sci., 2009

Constructing Risk Measures from Uncertainty Sets.

Karthik Natarajan, Dessislava Pachamanova, Melvyn Sim

Oper. Res., 2009

A 7.2mW quadrature GPS receiver in 0.13µm CMOS.

Kuang-Wei Cheng, Karthik Natarajan, David J. Allstot

Proceedings of the IEEE International Solid-State Circuits Conference, 2009

2008

Incorporating Asymmetric Distributional Information in Robust Value-at-Risk Optimization.

Karthik Natarajan, Dessislava Pachamanova, Melvyn Sim

Manag. Sci., 2008

2007

A semidefinite optimization approach to the steady-state analysis of queueing systems.

Dimitris Bertsimas, Karthik Natarajan

Queueing Syst. Theory Appl., 2007

Redesigning electronic health record systems to support public health.

Rita Kukafka, Jessica S. Ancker, Connie V. Chan, John Chelico, Sharib A. Khan, Selasie Mortoti, Karthik Natarajan, Kempton Presley, Kayann Stephens

J. Biomed. Informatics, 2007

2006

Persistence in discrete optimization under data uncertainty.

Dimitris Bertsimas, Karthik Natarajan, Chung-Piaw Teo

Math. Program., 2006

2004

Probabilistic Combinatorial Optimization: Moments, Semidefinite Programming, and Asymptotic Bounds.

Dimitris Bertsimas, Karthik Natarajan, Chung-Piaw Teo

SIAM J. Optim., 2004

2003

Microprocessor pipeline energy analysis.

Karthik Natarajan, Heather Hanson, Stephen W. Keckler, Charles R. Moore, Doug Burger

Proceedings of the 2003 International Symposium on Low Power Electronics and Design, 2003