Publications

Google Scholar Profile

Ph.D. Dissertation

• I. Chang, "The Constrained Discrete-Time State-Dependent Riccati Equation Technique for Uncertain Nonlinear Systems," Ph.D. Dissertation, Department of Aerospace Engineering, University of Illinois Urbana-Champaign, Urbana, IL, USA, May 2016 (Defended in November 2015).

M.S. Thesis

• I. Chang, "Decentralized Coordinated Attitude Control for Satellite Formation Flying via the State-Dependent Riccati Equation Technique," M.S. Thesis, Department of Astronomy, Yonsei University, Seoul, South Korea, February 2008 (Defended in December 2007).

Patents

<24 U.S. Patents Pending  as of Today.>

1. J.-M. Kang, H. Yun, and I. Chang, "Battery Pack State of Charge Estimation," U.S. Patent, US 12,416,676 B2, September 2025.

2. I. Chang, H. Yun, J.-M. Kang, and C.-F. Chang, "Early Detection of Battery Cell Performance Degradation," U.S. Patent, US 12,370,921 B2, July 2025.

3. I. Chang, C.-F. Chang, J.-M. Kang, H. Yun, C. J. Lee, Y. Zhu, and N. W. Pinto, "Battery Pressure Active Control," U.S. Patent, US 12,243,988 B2, March 2025.

4. S. Keum, J.-M. Kang, I. Chang, and Y. J. Kim, "Systems, Apparatuses, and Methods for Active End-Turn Cooling for an Electric Motor with Four-Bar Linkages," U.S. Patent, US 12,074,505 B2, August 2024.

5. S. Keum, J.-M. Kang, I. Chang, and Y. J. Kim, "Methods, Systems, and Apparatuses for Passive End-Turn Cooling for an Electric Motor Using Gravity," U.S. Patent, US 12,015,327 B2, June 2024.

6. S. Keum, I. Chang, J.-M. Kang, and Y. J. Kim, "Interior Permanent Magnet Motor Having Controllable Coolant Distribution," U.S. Patent, US 11,722,037 B2, August 2023.

7. I. Chang, S. Keum, J.-M. Kang, and Y. J. Kim, "System and Method of End-Turn Cooling for an Interior Permanent Magnet Motor," U.S. Patent, US 11,705,781 B2, July 2023.

8. I. Chang, J.-M. Kang, and S. Keum, "Yaw Stability Control System for a Motor Vehicle," U.S. Patent, US 11,702, 133 B2, July 2023.

9. J.-M. Kang and I. Chang, "System and Method for Estimating State of Charge of a Lithium Battery Cell of a Vehicle," U.S. Patent, US 11,660,979 B2, May 2023.

10. J. Zhao, C.-F. Chang, B. Hegde, I. Chang, and R. Rajkumar, "Connected and Automated Vehicles, Driving Systems, and Control Logic for Info-Rich Eco-Autonomous Driving," U.S. Patent, US 11,370,435 B2, June 2022.

11. I. Chang, M. Sun, and D. E. Edwards, "Internal Combustion Engine Coolant Flow Control," U.S. Patent, US 11,365,672 B2, June 2022.

12. I. Chang, E. R. Masters, Z. Li, D. Hwang, D. K. Grimm, and J. Dernotte, "Method and Apparatus for Active Vehicle Cabin Occupant Detection System," U.S. Patent, US 11,338,645 B2, May 2022.

13. M. Sun, Y. Hu, D. E. Edwards, J. Chen, I. Chang, and S. P. Moorman, "Active Thermal Management System and Method for Flow Control," U.S. Patent, US 11,312,208 B2, April 2022.

14. I. Chang, E. R. Masters, D. Hwang, Z. Li, J. Dernotte, and M. Firouz, "Method and Apparatus for Active Vehicle Cabin Occupant Protection System," U.S. Patent, US 11,299,013 B2, April 2022.

15. I. Haskara, B. Hegde, I. Chang, and C.-F. Chang, "Intelligent Energy Management System for a Vehicle and Corresponding Method," U.S. Patent, US 11,247,571 B2, February 2022.

16. J.-M. Kang, H. Yun, and I. Chang, "Control of Fuel Injection in an Internal Combustion Engine Based on Converged Fuel Injector Slope," U.S. Patent, US 10,760,523 B1, September 2020. 

17. Y. Zhang, F. R. Green, A. A. Wray, and I. Chang, "Implement Control Based on Noise Values," U.S. Patent, US 10,011,974 B2, July 2018.

18. Y. Zhang, M. A. Snopko, I. Chang, P. Converse, and V. Janardhan, "System for Controlling the Total Emission Produced by a Multi-Engine Power System," U.S. Patent, US 9,896,982 B1, February 2018.

19. Y. Zhang, M. Snopko, I. Chang, V. Janardhan, and P. Converse, "Systems, Apparatuses, and Methods to Control Output Power of Groups of Engines," U.S. Patent, US 9,889,915 B2, February 2018.

20. I. Chang, S. Jaliwala, Y. Zhang, and J. Chase, "System and Method for Positioning Implement of Machine," U.S. Patent, US 9,752,300 B2, September 2017.

21. Y. Zhang, I. Chang, J. Chase, V. Janardhan, and P. Converse, "Managing Load Sharing Among Multiple Engines," U.S. Patent, US 9,683,503 B2, June 2017.

22. Y. Zhang, F. Green, A. Wray, and I. Chang, "Implement Control Based on Surface-Based Cost Function and Noise Values," U.S. Patent, US 9,598,844 B1, March 2017.

Confidential Publications

• 9 Trade Secrets (confidential)

• 2 Defensive Publications (confidential)

Peer-Reviewed Papers

1. I. Chang, H. Yun, and J.-M. Kang, "Pressure-Based Early Detection of Lithium-Metal Battery Degradation via Irreversible Swelling Analysis," 2026 IEEE Transportation Electrification Conference & Expo, Novi, MI, June 2026 (accepted, to appear).

2. I. Chang, S.-Y. Shieh, and S. Gupta, "High-Fidelity Battery Capacity Estimation Method Using Recurrent Neural Network and Data Mapping Strategy," 2026 American Control Conference, New Orleans, LA, May 2026 (accepted, to appear).

3. S. Gupta,  B. Hegde, I. Haskara, S.-Y. Shieh, and I. Chang, "Data-driven Physics Informed Koopman (DPIK) Battery State of Charge Estimation using Connectivity-enabled Streamed Data," 5th Modeling, Estimation and Control Conference, Pittsburgh, PA, October 2025, IFAC-PapersOnLine, Vol. 59, No. 30, pp. 1060-1065, 2025 (ATS Best Paper Award Finalist), (Link).

4. S. Gupta,  B. Hegde, I. Haskara, S.-Y. Shieh, and I. Chang, "Learning-Based Cell Level Battery Digital Twin for Electric Vehicles," 2025 SAE World Congress Experience, Detroit, MI, April 2025, SAE Technical Paper 2025-01-8386 (Link).

5. I. Chang, M. Sun, and D. Edwards, "Advanced Engine Cooling System for a Gas-Engine Vehicle, Part III: State Feedback Control System Design," 2025 SAE World Congress Experience, Detroit, MI, April 2025, SAE Technical Paper 2025-01-8161 (Link).

6. I. Chang, M. Sun, and D. Edwards, "Advanced Engine Cooling System for a Gas-Engine Vehicle, Part II: Modeling External Components," 4th Modeling, Estimation and Control Conference, Chicago, IL, October 2024, IFAC-PapersOnLine, Vol. 58, No. 28, pp. 144-149, 2024 (Link).

7. I. Chang and J.-M. Kang, "Robust Adaptive Control for Dual Fuel Injection Systems in Gasoline Engines," 2024 SAE World Congress Experience, Detroit, MI, April 2024,  SAE Technical Paper 2024-01-2841 (Link).

8. I. Chang, M. Sun, and D. Edwards, "Advanced Engine Cooling System for a Gas-Engine Vehicle, Part I: A New Coolant Flow Control During Cold Start," 2024 SAE World Congress Experience, Detroit, MI, April 2024, SAE Technical Paper 2024-01-2414  (Link).

9. I. Chang and T. Karnjate, "Enhanced Longitudinal Vehicle Speed Control for an Autonomous Gas-Engine Vehicle: Improving Performance and Efficiency," 2024 SAE World Congress Experience, Detroit, MI, April 2024, SAE Technical Paper 2024-01-2059  (Link).

10. I. Chang and J. Bentsman, "High-Fidelity Discrete-Time State-Dependent Riccati Equation-Based Filters for Stochastic Nonlinear Systems with Gaussian/Non-Gaussian Noises," 2018 American Control Conference, Milwaukee, WI, June 2018, pp. 1132-1137 (Link).

11. J. Bentsman, C. Taft, H. J. Sunaryanto, J. Sorge, H. Zhao, and I. Chang, "Patch Theory: Analytical Robustification of Once-Through Power Plant PID Control Cluster," 60th Annual ISA Power Industry Division (POWID) Symposium, Cleveland, OH, June 2017.

12. J. Bentsman, C. Taft, J. Sorge, H. Zhao, and I. Chang, "Patch Theory: Robustness/Performance Enhancement of Power Plant PID Control Clusters Through Analytical Design," 59th ISA Power Industry Division (POWID)/EPRI Symposium, Vol. 59, ISA Vol. 514, Charlotte, NC, June 2016 (3rd Best Paper Award).

13. I. Chang and J. Bentsman, "Stabilizing Uncertain Nonlinear Systems via the Constrained Discrete-Time State-Dependent Riccati Equation Controller," 54th IEEE Conference on Decision and Control, Osaka, Japan, December 2015, pp. 3870-3875 (Link).

14. I. Chang, C. Taft, J. Sorge, M. Little, and J. Bentsman, "Robustness/Performance Enhancement of Power Plant PID Controller, Part I: Model Identification and Robust Controller Design," 57th ISA Power Industry Division (POWID) Symposium, Scottsdale, AZ, June 2014.

15. I. Chang and J. Bentsman, "Constrained Discrete-Time State-Dependent Riccati Equation Technique: A Model Predictive Control Approach," 52nd IEEE Conference on Decision and Control, Florence, Italy, December 2013, pp. 5125-5130 (Link).

16. I. Chang, J. Bentsman, S.-Y. Park, and C. Park, "Constrained Discrete-Time State-Dependent Riccati Equation Control for Decentralized Multi-Agent Systems," AAS/AIAA Astrodynamics Specialist Conference, Hilton Head Island, SC, August 2013, AAS 13-923.

17. S.-J. Chung, S. Bandyopadhyay, I. Chang, and F. Y. Hadaegh, "Phase Synchronization Control of Complex Networks of Lagrangian Systems on Adaptive Graphs," Automatica, Vol. 49, No. 5, May 2013, pp. 1148-1161 (Link).

18. S.-J. Chung, I. Chang, and F. Y. Hadaegh, "Phase Synchronization Control of Robotic Networks on Periodic Ellipses with Adaptive Network Topologies," AIAA Guidance, Navigation, and Control Conference, Portland, OR, August 2011, AIAA 2011-6631 (Link).

19. M. Abdelrahman, I. Chang, and S.-Y. Park, "Magnetic Torque Attitude Control of a Satellite Using the State-Dependent Riccati Equation Technique," International Journal of Non-Linear Mechanics, Vol. 46, No. 5, June 2011, pp. 758-771 (Link).

20. I. Chang, S.-J. Chung, and F. Y. Hadaegh, "Novel Coordinate Transformation and Robust Cooperative Formation Control for Swarms of Spacecraft," 4th International Conference on Spacecraft Formation Flying Missions & Technologies, Quebec, Canada, May 2011.

21. I. Chang, S.-J. Chung, and L. Blackmore, "Cooperative Control with Adaptive Graph Laplacians for Spacecraft Formation Flying," 49th IEEE Conference on Decision and Control, Atlanta, GA, December 2010, pp. 4926-4933 (Link).

22. I. Chang, S.-Y. Park, and K.-H. Choi, "Nonlinear Attitude Control of a Tether-Connected Multi-Satellite in Three-Dimensional Space," IEEE Transactions on Aerospace and Electronic Systems, Vol. 46, No. 4, October 2010, pp. 1950-1968 (Link).

23. J. Jung, I. Chang, and S.-Y. Park, "Attitude Synchronization of the Spacecraft Formation Flying via the SDRE Controller Using Reaction Wheels," 20th AAS/AIAA Space Flight Mechanics Meeting, San Diego, CA, February 2010, AAS 10-260.

24. I. Chang and S.-J. Chung, "Exponential Stability Region Estimates for the State-Dependent Riccati Equation Controllers," 48th IEEE Conference on Decision and Control, Shanghai, China, December 2009, pp. 1974-1979 (Link).

25. I. Chang, S.-Y. Park, and K. -H. Choi, "Decentralized Coordinated Attitude Control for Satellite Formation Flying via the State-Dependent Riccati Equation Technique," International Journal of Non-Linear Mechanics, Vol.44, No.8, October 2009, pp. 891-904 (Link).

26. I. Chang and S.-J. Chung, "Bio-Inspired Adaptive Cooperative Control of Heterogeneous Robotic Networks," AIAA Guidance, Navigation, and Control Conference, Chicago, IL, August 2009, AIAA 2009-5886 (Link).

27. I. Chang, S.-Y. Park, and K.-H. Choi, "The Relaxed State-Dependent Riccati Equation Technique: Concept and Applications," F. Landis Markley Astronautics Symposium, Cambridge, MD, June 2008, AAS 08-294.

28. I. Chang, S.-Y. Park, and K.-H. Choi, "Nonlinear Attitude Dynamics and Control for Satellite Tethered Formation Flying in Three-Dimensional Free Space," 18th AAS/AIAA Space Flight Mechanics Meeting, Galveston, TX, January 2008, AAS 08-151.

29. I. Chang, S.-Y. Park, and K.-H. Choi, "A Decentralized Coordinated Attitude Control for Satellites with Thrusters in Formation Flying via the State-Dependent Riccati Equation Technique," Proceedings of the Korean Society for Aeronautical & Space Sciences, Jeju, Republic of Korea, November 2007, KSAS 07-2922.

30. I. Chang, S.-Y. Park, and K.-H. Choi, "Stability Region Estimates for the SDRE Controlled Attitude Systems in Satellite Formation Flying," Proceedings of the Korean Space Science Society, Daegu, Republic of Korea, October 2007, pp. 135-138.

31. I. Chang, S.-Y. Park, and K.-H. Choi, "A Decentralized Attitude Control for Spacecraft Formation Flying via the State-Dependent Riccati Equation Technique," AAS/AIAA Astrodynamics Specialist Conference, Mackinac Island, MI, August 2007, AAS 07-403.

Internal Technical Reports

• 13 Technical Reports at GM

• 3 Technical Reports at Caterpillar Inc.