Research

• AcceptedLee, S.H., Yun, H., Ham, S.W., & Kim, D.K. Impact of traffic management center functionality on speed harmonization in urban networks under mixed traffic environments. Transportation Research Part A: Policy and Practice
• 2026Kim, P., Yun, H., & Kim, D.K. City-scale unmet bus demand modeling with passenger reneging behavior. Journal of Public Transportation
• 2026Lim, S.Y.†, Yun, H.†, Bansal, P., Kim, D.K., & Kim, E.J. A Large Language Model for Feasible and Diverse Population Synthesis. Transportation Research Part C Code
• 2025Lee, E.H., Yun, H., Cho, S.H., & Lee, E. Aggressive driving in ride-hailing: Work hours and road conditions. Journal of Transportation Safety & Security
• 2025Yun, H. & Lee, E.H. Party politics in transport policy with a large language model. Transport Policy
• 2025Min, D., Yun, H., Kim, D.K., & Ham, S.W. Dynamic origin-destination matrix estimation using metamodel-based model predictive control for real time application. Transportation Research Record
• 2025Kim, P., Yun, H., Kim, J., & Kim, D.K. Scalable link cost learning for real-time route guidance systems. Transportation Research Part C
• 2024Yun, H., Kim, E.J., Ham, S.W., & Kim, D.K. Navigating the non-compliance effects on system optimal route guidance using reinforcement learning. Transportation Research Part C
• 2023Min, D., Yun, H., Ham, S.W., & Kim, D.K. Real-time estimation of origin-destination matrices using a deep neural network for digital twins. Transportation Research Record
• 2023Yun, H., Lee, E.H., Moon, S., & Kim, D.K. Data-driven approach for measuring and managing physical distancing in subways during pandemic conditions. Transportation Research Record
• 2022Yun, H., Kim, E.J., Ham, S.W., & Kim, D.K. Price incentive strategy for the e-scooter sharing service using deep reinforcement learning. Journal of Intelligent Transportation Systems
• 2021Yun, H., Lee, E.H., Kim, D.K., & Cho, S.H. Development of estimating methodology for transit accessibility using smart card data. Transportation Research Record

• –Yun, H.†, Lee, E.H.†, Zhang, J., Wang, Z., & Kim, E.J. Neural-Bayesian Structure Learning for Discrete Choice Modeling. Code
• –Kim, J.T., Yoon, G., Kim, D.K., & Yun, H. Gradient-Based Calibration of Volume Delay Functions in Static Traffic Assignment via Implicit Differentiation.
• –Kim, P., Yun, H., & Kim, D.K. Learning Heterogeneous Link Costs for Scalable Real-Time Route Recommendation. (Under review in Transportation Research Part E: Logistics and Transportation Review)
• –Lee, E.H., Cho, J.H., Tu, Z., & Yun, H. DeciGen: Generative Multi-Criteria Decision Making in Transportation Planning.
• –Lee, E.H., Lee, E., Lee, Y.-I., Yun, H., Yun, H.-R., Lee, G., & Lee, T. Fare-free Subway and Senior Delivery Work in Seoul. (Under revision in Transportation Research Record)
• –Choi, S., Choi, J., Kim, D.K., & Yun, H. A two-stage framework for anomaly detection and classification in loop detector data.
• –Lee, E.H., Lee, J.-H., Kim, J., Yun, H., Cho, S.-H., & Kwon, O.H. Functional Demand-Responsive Transit Planning for Older Adults in a Super-Aging Society Using Generative AI. (Under revision in Transportation Research Part A: Policy and Practice)
• –Lee, E.H., Lee, E., Yun, H., Cho, S.-H., & Souza, R. Prioritizing Road Drain Cleaning for Urban Flood Resilience in Seoul. (Under review in Transportation Research Record)
• –Ahn, S., Kim, W., Yun, H., Cho, S.-H., Soltani, A., & Lee, E.H. Morning Guard: Crossing Guard Effects in School Zones Using Vision AI. (Under review in Transportation Research Record)

• 2027Yun, H.†, Lee, E.H.†, Zhang, J., Wang, Z., & Kim, E.J. Neural-Bayesian Structure Learning for Joint Causal Discovery and Discrete Choice Modeling. TRB 106th Annual Meeting (Accepted for presentation)
• 2027Yun, H.†, Jiang, L.†, Lu, J., Wei, C., McCoy, D., Ruble, T., Lintner, I., Reamer, D., Seely, C., Beck, J., & Wang, Z. Driver Comprehension and Behavior at Reduced Conflict Intersections: Evidence from Field Trajectories, Public Survey, and Driving Simulation. TRB 106th Annual Meeting (Accepted for presentation)
• 2027Lee, E.H., Lee, J.-H., Kim, J., Yun, H., Cho, S.-H., & Kwon, O.H. Functional Demand-Responsive Transit Planning for Older Adults in a Super-Aging Society Using Generative AI. TRB 106th Annual Meeting (Accepted for presentation)
• 2027Lee, E.H., Lee, E., Yun, H., Cho, S.-H., & Souza, R. Prioritizing Road Drain Cleaning for Urban Flood Resilience in Seoul. TRB 106th Annual Meeting (Accepted for presentation)
• 2027Ahn, S., Kim, W., Yun, H., Cho, S.-H., Soltani, A., & Lee, E.H. Morning Guard: Crossing Guard Effects in School Zones Using Vision AI. TRB 106th Annual Meeting (Accepted for presentation)
• 2026Kim, J.T., Kim, D.K., & Yun, H. Network-Level Volume-Delay Function Parameter Calibration via Path-Based Proxy Gradients. 32nd ITS World Congress
• 2026Choi, S., Choi, J., Kim, D.K., & Yun, H. Data-driven Identification of Incidents Affecting Traffic Flow under Faulty Sensor Data. 32nd ITS World Congress
• 2026Yun, H., Jiang, L., Zhang, J., & Wang, Z. Network-Wide Traffic Reconstruction Using a Generative Dynamic Traffic Assignment Framework. IEEE ITSC 2026 Workshop on Disruptive Technologies for Intelligent Urban Traffic Monitoring and Network Management
• 2026Lim, S.Y.†, Yun, H.†, Bansal, P., & Kim, E.J. A Large Language Model for Feasible and Diverse Population Synthesis. TRB 105th Annual Meeting
• 2026Lee, E.H., Lee, E., Lee, Y.-I., Yun, H., Yun, H.-R., Lee, G., & Lee, T. Fare-free Subway and Senior Delivery Work in Seoul. TRB 105th Annual Meeting
• 2026Kim, J.T., Kim, D.K., & Yun, H. Gradient-Based Calibration of Volume Delay Functions in Static Traffic Assignment via Implicit Differentiation. TRB 105th Annual Meeting
• 2026Lee, E.H., Yun, H., & Tu, Z. A Generative Multi-Criteria Decision-Making Framework for Evaluating Transportation Systems: A Case Study of Texas. TRB 105th Annual Meeting
• 2025Yun, H., Kim, E.J., & Kim, D.K. The Potential of Large-Language Models as Regularizers in Deep Generative Models for Population Synthesis. ITS Asia Pacific Forum
• 2025Yun, H., Kim, D.J., & Kim, D.K. Managing Supply-Demand Imbalance in Shared Mobility Services Through Spatiotemporal Pricing. Transportation Research Symposium 2025
• 2025Lee, S.H., Ham, S.W., Yun, H., & Kim, D.K. Speed Harmonization Based on Multi-agent Reinforcement Learning for Mitigating Traffic Congestion under Mixed Traffic Environment. TRB 104th Annual Meeting
• 2025Min, D., Yun, H., Ham, S.W., & Kim, D.K. Real-time Dynamic Origin-Destination Matrix Estimation Using Metamodel-based Model Predictive Control. TRB 104th Annual Meeting
• 2024Min, D., Yun, H., Ham, S.W., & Kim, D.K. Real-time Estimation of Origin-Destination Matrices Using a Deep Neural Network for Digital Twins. TRB 103rd Annual Meeting
• 2023Yun, H., Lee, E.H., Moon, S., & Kim, D.K. Analysis of Subway Passenger's Physical Distancing Before and After the Outbreak of COVID-19. TRB 102nd Annual Meeting
• 2023Min, D., Yun, H., & Kim, D.K. Developing Lane-changing Strategy of Autonomous Vehicles Based on Deep Reinforcement Learning Using Long-range Information for Mitigating Traffic Congestion. 15th International Conference of EASTS

† Equal contribution.