SPS Lab @ SSU We Optimize!

Works in Progress

  1. Structure-Preserving Process Case Embeddings via Directed Graph Convolutional Networks, accepted.
  2. Closed-Loop Supply Chain Model with Third-Party Logistics–Based Return Management System: A Two-stage Stochastic Programming Approach, under review.
  3. A Robust Optimization Approach for Multi-Pack Battery Scheduling under Efficiency and State-of-Charge Uncertainty.
  4. Optimization of Electric Vehicle Charging Schedules with Mobile Charging Robots.
  5. Optimization of Electric Vehicle Battery Swapping Station Operations with State-of-Health Considerations.

Publications (International)

  1. Y. Shin, Y. Lee*, Two-stage Robust Optimization Approach for Integrated Supply Chain Planning with Hybrid-dark Stores, Omega 140, 103479, Apr. 2026. (on-line link)
  2. Y. Kim, Y. Lee, C. Kang, Self-Adaptive Prompt Engineering for Cost-Efficient Language Models: Switching between Chain-of-Thought and Direct Answer, ICIC Express Letters 20(2), 199-207, Feb. 2026. (on-line link)
  3. S. Oh, J. Jeong, Y. Lee*, K. Lee*, A Branch-and-Price Algorithm for the Parallel-line Lot-sizing and Scheduling Problem in Flat-panel Display Manufacturing Process, Omega 138, 103386, Jan. 2026. (on-line link)
  4. S. Hong, Y. Lee*, K. Lee*, An Approximate Dynamic Programming Approach to Wafer-Lot Scheduling for Parallel Multi-Chamber Equipment in Semiconductor Fabrication Lines, International Journal of Production Research 38(2), 1-26, Nov. 2025. (on-line link)
  5. S. Hong, J. Park, Y. Lee*, A Robust Optimization Approach for the Multi-Period Strip Cutting Problem with Multi-Cutter Slitting Machines, Applied Sciences 15(19), 10387, 2025. (on-line link)
  6. M. Kang, B. Lee, Y. Lee*, A Robust Optimization Approach for E-bus Charging and Discharging Scheduling with Vehicle-to-Grid Integration, Mathematics 13(9), 1380, May. 2025. (on-line link)
  7. S. Hong, Y. Lee*, K. Lee*, Capacity Estimation for Semiconductor Wafer Fabrication Facilities via an Optimization Model based on Flexible Lead Times, IEEE Transactions on Semiconductor Manufacturing 38(2), 292-310, May. 2025. (on-line link)
  8. Y. Lee, K. Lee*, Valid Inequalities and Extended Formulations for Lot-sizing and Scheduling Problem with Sequence-dependent Setups, European Journal of Operational Research 310(1), 201-216, Oct. 2023. (on-line link)
  9. Y. Lee, K. Lee*, New Integer Optimization Models and an Approximate Dynamic Programming Algorithm for the Lot-sizing and Scheduling Problem with Sequence-dependent Setups, European Journal of Operational Research 302(1), 230-243, Oct. 2022. (on-line link)
  10. Y. Lee, K. Lee*, Lot-sizing and Scheduling in Flat-Panel Display Manufacturing Process, Omega 93, 102036, Jun. 2020. (on-line link)

Publications (Domestic)

  1. M. Kang, D. Min, B. Lee, Y. Lee*, Optimization of Electric Bus Charging and Discharging Schedules with Vehicle-to-Grid Technology, The Transactions of the Korean Institute of Electrical Engineers 74(5), 761-774, May. 2025.

International Conferences

  1. S. Hong, Y. Lee, K. Lee, “An Optimization Model and Approximate Dynamic Programming Algorithms for a Wafer-Lot Scheduling Problem in Parallel Multi-Chamber Equipment” in EURO 2025, Leeds, UK, Jun. 2025.
  2. Y. Lee, K. Lee, “Valid Inequalities and Extended Formulations for Single-period Relaxation of Lot-sizing and Scheduling Problem” in EURO 2022, Espoo, Finland, Jul. 2022.
  3. S. Hong, Y. Lee, K. Lee, “An Optimization Model based on Flexible Lead Times for Semiconductor Wafer Fabrication” in EURO 2022, Espoo, Finland, Jul. 2022.
  4. Y. Lee, K. Lee, “New Integer Optimization Models and Approximate Dynamic Programming Algorithm for the Lot-sizing and Scheduling Problem with Sequence-dependent Setups” in IFORS 2021, Seoul (virtual), South Korea, Aug. 2021.
  5. Y. Lee, K. Lee, “On the Discrete Lot-sizing and Scheduling Problem with Sequence-dependent Setup” in ISMP 2018, Bordeaux, France, Jul. 2018.

Domestic Conferences

  1. 손성은, 조정운, 최민영, 이혁진, 이연수, “State-of-Health를 고려한 전기차 배터리 교환 스테이션 운영 최적화” in 대한산업공학회 춘계학술대회 (KIIE 2025), Jeju, Jun. 2025.
  2. 최민영, 이혁진, 손성은, 조정운, 이연수, “이동형 충전로봇 기반 전기차 충전 스케줄링 최적화” in 대한산업공학회 춘계학술대회 (KIIE 2025), Jeju, Jun. 2025.
  3. 강민규, 민동욱, 이보성, 이연수, “V2G 기술을 활용한 전기차 군집 기반 사업자의 운영 스케줄 최적화” in 대한산업공학회 춘계학술대회 (KIIE 2024), Yeosu, May. 2024.
  4. S. Hong, Y. Lee, K. Lee, “An Optimization Model based on Flexible Lead Times for Semiconductor Wafer Fabrication” in 대한산업공학회 춘계학술대회 (KIIE 2022), Jeju, Jun. 2022.
  5. Jinyeong Jeong, Y. Lee, K. Lee, “A Decomposition Approach for the Parallel Line Lot-sizing and Scheduling Problem with Sequence-dependent Setup and Item Family” in 대한산업공학회 추계학술대회 (KIIE 2021), Seoul, Nov. 2021.
  6. Y. Lee, K. Lee, “New Integer Optimization Models and Approximate Dynamic Programming Algorithm for the Lot-sizing and Scheduling Problem with Sequence-dependent Setups” in 대한산업공학회 추계학술대회 (KIIE 2020), Seoul, Nov. 2020.
  7. Y. Lee, K. Lee, “An Extended Formulation Approach for the Lot-sizing and Scheduling Problem with Sequence-dependent Setups and Production Run Limit” in 대한산업공학회 추계학술대회 (KIIE 2018), Seoul, Nov. 2018.
  8. Y. Lee, K. Lee, “On the Discrete Lot-sizing and Scheduling Problem with Sequence-dependent Setup” in 한국경영과학회 추계학술대회 (KORMS 2017), Seoul, Nov. 2017.