Inseok Hwang

Inseok Hwang

2004 - Associate Professor

Degrees

B.S., Seoul National University, Aerospace Engineering, 1992
M.S., Korea Advanced Institute of Science and Technology, Aerospace Engineering, 1994
Ph.D., Stanford University, Aeronautics and Astronautics, 2004

Contact

701 W. Stadium Ave.
West Lafayette, IN 47907-2045

Office: ARMS 3211
Office Phone: +1 765 49-40687
Email: ihwang@purdue.edu
Webpage: http://cobweb.ecn.purdue.edu/~ihwang/

Interests

Hybrid Systems/Nonlinear Systems:
  Analysis: stability and control of hybrid systems;
  Estimation: state estimation for hybrid systems;
  Information Inference: system identification for hybrid systems;
Approximate reachable set computation for various dynamical systems

Air Traffic Control:
  Target tracking and identity management, and conflict detection and resolution;
  Safe interface design;
  Real-time safety verification tools for safety critical systems

Other applications:
  Biological systems; sensor networks; decentralized estimation and control of large scale interconnected dynamical systems.

Awards and Major Appointments

AIAA Associate Fellow - 2012

Selected as one of the nation’s 82 brightest young engineers by the National Academy of Engineering (NAE) invited to attend the NAE’s 2008 Frontier’s of Engineering Symposium

NSF CAREER Award, January 2008

NASA listed the “Multiple-Target Tracking and Identity Management (MTIM)” Algorithm as a “Reportable” in May 2006. (This title is given to new technologies, invention, or innovation made during the project funded by NASA.)

Research Areas

Dr. Hwang's research has been strongly motivated by difficult and interesting practical problems such as controlling multiple-vehicle systems. Controlling multiple-vehicle systems is one of the most important and challenging aspects of modern system theory and practice. Control of such systems involves the analysis of multiple dynamical systems which have inherently decentralized structures. The motions of vehicles have to be coordinated in such a way that the vehicles achieve their goals without conflicts between them. This requires path planning (computing optimal trajectories of vehicles from starting positions to destinations) and conflict detection and resolution. Path planning and conflict detection and resolution require information about individual vehicles, and therefore communication between vehicles for sharing this information is important. Multiple-vehicle systems encompass a variety of applications, including groups of mobile robots, ad-hoc sensor networks, and air traffic control. Dr. Hwang's research has focused mainly on applications of control of multiple-vehicle systems to air traffic control. For air traffic control, the motions of aircraft within the national airspace have to be coordinated in such a way that all aircraft fly safely and efficiently. For this purpose, he is interested in developing tools to aid Air Traffic Control, and thus potentially improve the efficiency as well as safety of the current system.

Publications

C-E. Seah and I. Hwang, "Algorithm for Performance Analysis for the IMM Algorithm," IEEE Transactions on Aerospace and Electronic Systems, Vol. 47(2), p1114- 1124, April 2011.

J. Jin and I. Hwang, "Attitude Control of a Spacecraft with Single Variable-speed Control Moment Gyroscope," AIAA Journal of Guidance, Control and Dynamics, Vol. 34(6), November-December 2011.

W. Liu and I. Hwang, "Robust Estimation and Fault Detection and Isolation Algorithms for Stochastic Linear Hybrid Systems with Unknown Fault Input," IET Control Theory & Applications, Vol. 5(12), p1353 – 1368, 2011.

J. Li, T. Wang, M. Savai, and I. Hwang, "A Graph-Based Algorithm for Dynamic Airspace Configuration," AIAA Journal of Guidance, Control and Dynamics, Vol. 33(4), p1082-1094, July-August 2010.

C.-E. Seah, A. Aligawesa, and I. Hwang, "An Algorithm for Conformance Monitoring in Air Traffic Control," AIAA Journal of Guidance, Control and Dynamics, Vol. 33(2), March-April 2010.

I. Hwang, S. Kim, Y. Kim, and C.-E. Seah, "A Survey of Fault Detection, Identification, and Reconfiguration Methods", IEEE Transactions on Control Systems Technology, Vol. 18(3), May 2010.

Y. Eun, I. Hwang, and H. Bang, “Optimal Arrival Flight Sequencing and Scheduling using Discrete Air-borne Delays,” IEEE Transactions on Intelligent Transportation Systems, Vol. 11(2), p359-373, June 2010.

I. Hwang, J. Li, and D. Du, “Differential Transformation and Its Application to Nonlinear Optimal Control,” ASME Journal of Dynamic Systems, Measurement, and Control, Vol. 131 (5), September 2009.

C.-E. Seah and I. Hwang, "Terminal-Area Aircraft Tracking by Hybrid Estimation," AIAA Journal of Guidance, Control and Dynamics, Vol. 32 (3), p836-849, May-June 2009.

C.-E. Seah and I. Hwang, “Stochastic Linear Hybrid Systems: Model, Estimation, and Application to Aircraft Tracking,” IEEE Transactions on Control Systems Technology, Vol. 17(3), May 2009.

C.-E. Seah and I. Hwang, “State Estimation for Stochastic Linear Hybrid Systems with Continuous-State-Dependent Transitions: An IMM Approach,” IEEE Transactions on Aerospace and Electronic Systems, Vol. 45(1), January 2009

C.-E. Seah and I. Hwang, "Stochastic Linear Hybrid Systems: Model, Estimation, and Application to Aircraft Tracking," IEEE Transactions on Control Systems Technology, accepted on May 5, 2008.

C.-E. Seah and I. Hwang, "State Estimation for Stochastic Linear Hybrid Systems: An IMM Approach," IEEE Transactions on Aerospace and Electronic Systems, Vol. 45, No. 1, January 2009.

I. Hwang and C.-E. Seah, "Intent Based Probabilistic Conflict Detection for the Next Generation Air Transportation System," Proceedings of the IEEE Special Issue on Aviation Information Systems, Vol. 96, No. 12, December 2008.

C.-E. Seah and I. Hwang, "An Estimation Algorithm for Stochastic Linear Hybrid Systems," IEEE Transactions on Aerospace and Electronic Systems, Vol. 44, No. 4, October 2008.

I. Hwang, J. Li, and D. Du, "A Numerical Algorithm for Optimal Control of a Class of Hybrid Systems: Differential Transformation Based Approach," International Journal of Control, Vol. 8, No. 2, pp. 277-293, February 2008.

S. Oh, I. Hwang, and S. Sastry, "Distributed Multiple-Target Tracking and Identity Management," AIAA Journal of Guidance, Control and Dynamics, Vol. 31., No. 1, January-February 2008.

C.-E. Seah and I. Hwang, "Hybrid Estimation for Stochastic Piecewise Linear Systems," In Hybrid Systems: Computation and Control, Lecture Notes in Computer Science, Springer, 2007.

I. Hwang, H. Balakrishnan, K. Roy, and C. Tomlin, "Multiple-Target Tracking and Identity Management Algorithm with Application to Aircraft Tracking," AIAA Journal of Guidance, Control and Dynamics, Vol. 30, No. 3, pp. 641-653, 2007.

I. Hwang, J. Kim, and C. Tomlin, "Protocol-Based Conflict Resolution for Air Traffic Control," Air Traffic Control Quarterly, Vol. 15(1), 2007.

J.L. Yepes, I. Hwang, and M. Rotea, "Algorithms for Aircraft Intent Inference and Trajectory Prediction," AIAA Journal of Guidance, Control and Dynamics, Vol. 30 (2), pp. 370-382, March-April 2007.

I. Hwang, H. Balakrishnan, and C. Tomlin, "State Estimation for Hybrid Systems: Applications to Aircraft Tracking," IEE Proceedings of Control Theory and Applications, 153(5): 556-566, September 2006.

Conference Proceedings, Presentations, Invited Lectures

J. Goppert, A. De Marco, and I. Hwang, "On Some Trim Strategies for Nonlinear Aircraft Flight Dynamics Models with Open Source Software JSBSim," In the Proceedings of the CEAS 2011: International Conference of the European Aerospace Societies, Venice, Italy, October 2011.

Y. Qian, I. Hwang, W. Jing, and J. Wei, "New Dynamic Model for Lunar Probe and Its Application to Quasi-Periodic Orbit about the Translunar Libration Point," In the Proceedings of the 2011 Astrodynamics Specialist Conference, Girdwood, Alaska, 2011.

W. Liu and I. Hwang, "Stochastic Approximation Algorithm with Application to Event-triggered Filtering," In the Proceedings of the 50th IEEE Conference on Decision and Control, Orlando, FL, December 2011.

G. Mann and I. Hwang, "4D Aircraft Taxi Conformance Monitoring with Stochastic Linear hybrid Systems," In the Proceedings of the AIAA Guidance, Navigation, and Control Conference, Portland, OR, August 2011.

S. Chandrasekar and I. Hwang, "Fault-Tolerant Attitude Control of a Micro-Satellite using a Redundancy-Free Single Gimbal Variable Speed Control Mount Gyroscope (SGVSCMG) system," In the Proceedings of the AIAA Guidance, Navigation, and Control Conference, Portland, OR, August 2011.

H. Choi, Y. Kim and I. Hwang, "UAV Vision-based Reactive Collision Avoidance Algorithm," In the Proceedings of the AIAA Guidance, Navigation, and Control Conference, Portland, OR, August 2011.

W. Liu and I. Hwang, "Optimal Sensor Scheduling Algorithm for Hybrid System State Estimation," In the Proceedings of the AACC American Control Conference, San Francisco, CA, June 2011.

A.Kim and I. Hwang, "A Hybrid-Systems Based Algorithm for Optimal Trajectory Generation with Obstacle Avoidance for an MAV Swarm," In the Proceedings of the AIAA Infortech@Aerospace 2011, St. Louis, MO, March 2011.

W. Liu, C.-E. Seah and I. Hwang, "Intent-based Probabilistic Trajectory Prediction and Conflict Detection for Air Traffic Control," In the Proceedings of the 49th IEEE Conference on Decision and Control, Atlanta, GA, December 2010.

M. Savai, J. Wei, and I. Hwang, "A Multilevel Graph Partitioning Algorithm for Dynamic Airspace Configuration," In the Proceedings of the AIAA Aviation Technology, Information, and Operations Conference, Fort Worth, TX, September 2010.

T. Wang, J. Li, J. Wei, and I. Hwang, "Dynamic Airspace Configuration Analysis for the Current and Future Traffic Scenarios," In the Proceedings of the AIAA Aviation Technology, Information, and Operations Conference, Fort Worth, TX, September 2010.

M. Savai, J. Li, T. Wang, and I. Hwang, "An Algorithm for Adaptable Dynamic Airspace Configuration," In the Proceedings of the AIAA Aviation Technology, Information, and Operations Conference, Fort Worth, TX, September 2010.

T. Wang, J. Li, and I. Hwang, "A Sectorization Method for Dynamic Airspace Configuration," In the Proceedings of the AIAA Guidance, Navigation, and Control Conference, Toronto, Canada, August 2010.

A. Aligawesa and I. Hwang, “Hybrid System's Model and Algorithm for Highway Traffic Monitoring,” Proceedings of the AACC American Control Conference, Baltimore, MD, June 2010.

W. Liu and I. Hwang, “Robust Estimation Algorithm for A Class of Hybrid Systems with Unknown Continuous Fault Input,” Proceedings of the AACC American Control Conference, Baltimore, MD, June 2010.

T. Wang, J. Li, J. Wei, and I. Hwang, "Preliminary Assessment of Operational Benefits for a Graph-Based Dynamic Airspace Configuration Algorithm," In the Proceedings of the 2010 Integrated Communications, Navigation and Surveillance (ICNS) Conference, Herndon, VA, May 11-13, 2010.

J. Goppert, and B. Wampler, "Vision Enhanced Navigation and Hybrid Control of Unmanned Vehicles," AIAA Region 3 Student Conference, West Lafayette, IN, April 2010. (Best Presentation Award)

W. Liu, C.-E. Seah and I. Hwang, "Estimation Algorithm for Stochastic Linear Hybrid Systems with Quadratic Guard Conditions," In the Proceedings of the 48th IEEE Conference on Decision and Control, Shanghai, China, December, 2009

C.-E. Seah and I. Hwang, "Fault Detection and Isolation for Stochastic Linear Hybrid Systems," In the Proceedings of the 48th IEEE Conference on Decision and Control, Shanghai, China, December 2009

J. Li, T. Wang, M. Savai, and I. Hwang, "A Spectral Clustering Based Algorithm for Dynamic Airspace Configuration," In the Proceedings of the AIAA Aviation Technology, Information, and Operations Conference, Hilton Head, SC, September 2009

P. Kotecha and I. Hwang, "Optimization based Tube Network Design for the Next Generation Air Transportation System (NextGen)," In the Proceedings of the AIAA Guidance, Navigation, and Control Conference, Chicago, IL, August 2009

J. Li, C.-E. Seah, and I. Hwang, "An Algorithm for Dynamic Airspace Configuration based on the Air Route Structure," In the Proceedings of the AIAA Guidance, Navigation, and Control Conference, Chicago, IL, August 2009

C.-E Seah, A. Aligawesa, and I. Hwang, "An Algorithm for Conformance Monitoring in Air Traffic Control," In the Proceedings of the AIAA Guidance, Navigation, and Control Conference, Chicago, IL, August 2009

R. Huang and I. Hwang, "A New Nonlinear Model Predictive Control Algorithm Using Differential Transformation with Application to Interplanetary Low-Thrust Trajectory Tracking," Proceedings of the AACC American Control Conference, St. Louis, MO, June 2009.

C.-E. Seah and I. Hwang, "Stability Analysis of the Interacting Multiple Model Algorithm," Proceedings of the AACC American Control Conference, Seattle, WA, June 2008.

J. Li and I. Hwang, "Algorithms for Uncertainty Analysis of An Air Traffic Management System," Proceedings of the AIAA Guidance, Navigation, and Control Conference, 11 pages, Honolulu, HI, August 2008.

R. Huang, I. Hwang, and M. Corless, "Application of a New Differential Transformation Based Algorithm to Interplanetary Optimal Low-Thrust Transfers," Proceedings of the AIAA/AAS Astrodynamics Specialist Conference, 12 pages, Honolulu, HI, August 2008.

C.-E. Seah and I. Hwang, "Performance Analysis of Kalman Filter Based Hybrid Estimation Algorithms," Proceedings of the IFAC World Congress, pp.13498-13503, Seoul Korea, July 2008.

C.-E. Seah and I. Hwang, "Stability Analysis of the Interacting Multiple Model Algorithm," Proceedings of the AACC American Control Conference, pp.2415-2420, Seattle, WA, June 2008.

I. Hwang, "Hybrid Estimation and Intent Based Probabilistic Conflict Detection for the Next Generation Air Transportation System (NextGen)," Dept. of Aerospace & Mechanical Engineering, University of Notre Dame, Notre Dame, IN, November 2007.

J. Li, D. Du and I. Hwang, "A Differential Transform Based Computational Method for Switched Linear Quadratic Optimal Control," Proceedings of the 46th IEEE Conference on Decision and Control, pp.3285-3290, New Orleans, LA, 2007.

D. Du, J. Li, and I. Hwang, "A Computational Method for Optimal Control of Hybrid Systems Using Differential Transformation," Proceedings of the 46th IEEE Conference on Decision and Control, pp.3151-3156, New Orleans, LA, September 2007.

I. Hwang and J Goppert, "Information Inference and Control of Complex Networked Systems: Application to Aerospace Systems," ATAIN Conference, September 2007.

I. Hwang, "An Plane Matching Algorithm for Accurate UAV Navigation Using Laser Range Finders in GPS-Latent Urban Environments," In the Proceedings of the UKC Aerospace Science and Technology Symposium, Washington D.C., August 2007

C.-E. Seah and I. Hwang, "A Hybrid Estimation Algorithm for Terminal Aircraft Tracking," In the Proceedings of the AIAA Guidance, Navigation, and Control Conference, Hilton Head, SC, August 2007.

D. Du and I. Hwang, "A Computational Approach to Solving Optimal Control Problems Using Differential Transformation," In the Proceedings of the AACC American Control Conference, New York, NY, July 2007.

I. Hwang, "Hybrid Estimation and Information Inference and its Application to Large-scale Networked Systems," Department of Aerospace Engineering, Ohio State University, Columbus, OH, May 2007.

C.-E. Seah and I. Hwang, "An Estimation Algorithm for Stochastic Linear Hybrid Systems with Continuous-State-Dependent Mode Transition," In the Proceedings of the 45th IEEE Conference on Decision and Control, San Diego, CA, December 2006.

C.-E. Seah and I. Hwang, "Target Tracking of Arrival Aircraft using Hybrid Estimation," In the Proceedings of the 44th Allerton Conference on Communication, Control, and Computing, Monticello, IL, September 2006.

C.-E. Seah and I. Hwang, "Hybrid Estimation Algorithm using State-Dependent Mode Transition Matrix for Aircraft Tracking," In the Proceedings of the AIAA Guidance, Navigation, and Control Conference, Keystone, CO, August 2006.


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