Publication

Publications

Journal Articles

J. Li, T. Wang, M. Savai, and I. Hwang, "A Graph-Based Algorithm for Dynamic Airspace Configuration," AIAA Journal of Guidance, Control and Dynamics, (submitted on October 19, 2009; under review)
C.-E. Seah and I. Hwang, "Stability of the Interacting Multiple Model Algorithm for a Class of Markov Jump Linear Systems," Automatica, (submitted on April 29, 2009, under review)
C.-E. Seah, A. Aligawesa, and I. Hwang, "An Algorithm for Conformance Monitoring in Air Traffic Control," AIAA Journal of Guidance, Control and Dynamics, (submitted on April 9, 2009; revision requested on September 27, 2009; revision submitted on October 23, 2009; accepted on October 25, 2009)
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, (submitted in January 5, 2009; conditionally accepted on March 20, 2009; revised version submitted on March 31, 2009; accepted on June 8, 2009.)
Y. Eun, I. Hwang, and H. Bang, "Optimal Arrival Flight Sequencing and Scheduling using Discrete Air-borne Delays," IEEE Transactions on Intelligent Transportation Systems, (submitted on September 9, 2008; conditionally accepted on April 28, 2009; revised version submitted on September 27, 2009; under review)
C.-E. Seah and I. Hwang, "Algorithm for Performance Analysis of Kalman Filter Based Hybrid Estimation," IEEE Transactions on Aerospace and Electronic Systems, (submitted on August 13, 2008; conditionally accepted on January 11, 2009; revision submitted on March 24, 2009; 2nd revision reqested on July 23, 2009; 2nd revision submitted on October 7, 2009; accpeted on November 9, 2009)
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. (submitted on August 5, 2008; accepted on April 22, 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. (submitted on July 29, 2008; accepted on November 20, 2008)
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 (12), December 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 (2), p277-293, February 2008.
C.-E. Seah and I. Hwang, "Stochastic Linear Hybrid Systems: Model and Estimation and Application in Air Traffic Control," IEEE Transactions on Control Systems Technology, Vol. 17(3), May 2009. (submitted in March 2007, accepted in May 2008).
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), p376-391, January 2009. (submitted on March 13, 2007, accepted in January 24, 2008).
S. Oh, I. Hwang, and S. Sastry, "Distributed Multiple-Target Tracking and Identity Management Algorithm ," AIAA Journal of Guidance, Control and Dynamics, Vol. 31 (1), 2008.
I. Hwang, J. Kim, and C. Tomlin, "Protocol-Based Conflict Resolution for Air Traffic Control," Air Traffic Control Quarterly, Vo1. 15 (1), p1-34, 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 (3), p641-653, May-June 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), p370-382, 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, Vol. 153(5), p556-566, September 2006.
D.M. Stipanovic, I. Hwang, and C. Tomlin, "Computation of an Over-Approximation of the Backward Reachable Set using Subsystem Level Set Functions," Journal of Dynamics of Continuous, Discrete, and Impulsive Systems, December, 2003.

Book Chapters

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, D.M. Stipanovic, and C. Tomlin, "Polytopic Approximations of Researchable Sets applied to Linear Dynamic Games and to a Class of Nonlinear Systems," Advances in Control, Communication Networks, and Transportation Systems: In Honor of Pravin Varaiya, E.H. Abed (Ed.), Systems and Control: Foundations and Applications Series, Birkhauser, Boston, 2005.
H. Balakrishnan, I. Hwang, J. Jang, and C. Tomlin, "Inference Methods for Autonomous Stochastic Linear Hybrid Systems," In Hybrid Systems: Computation and Control, Lecture Notes in Computer Science, Springer, 2004.
I. Hwang, H. Balakrishnan, R. Ghosh, and C. Tomlin, "Reachability Analysis of Delta-Notch Lateral Inhibition using Predicate Abstraction," In High Performance Computing, Lecture Notes in Computer Science, LNCS 2552, Springer, 2002.

Conference Articles

Hybrid Estimation and Applications

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. submitted
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. submitted
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.
C.-E. Seah and I. Hwang, "Stability Analysis of the Interacting Multiple Model Algorithm," In the Proceedings of the AACC American Control Conference, Seattle, WA, June 2008.
C.-E. Seah and I. Hwang, "Performance Analysis of Kalman Filter Based Hybrid Estimation Algorithms," In the Proceedings of the IFAC World Congress, Seoul, Korea, July 2008.
I. Hwang and C.-E. Seah, "An Estimation Algorithm for Stochastic Linear Hybrid Systems with Continuous-State-Dependent Mode Transitions," In the Proceedings of the 45th IEEE Conference on Decision and Control, San Diego, CA, December 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.
J.L. Yepes, I. Hwang, and M. Rotea, "Pilot's Intent Inference and Aircraft Trajectory Prediction with Applications to Air Traffic Control," In the Proceedings of the UKC Aerospace Science and Technology Symposium, Irvine, CA, August 2005.
J.L. Yepes, I. Hwang, and M. Rotea, "An Intent-Based Trajectory Prediction Algorithm for Air Traffic Control," In the Proceedings of the AIAA Guidance, Navigation, and Control Conference, San Francisco, CA, August 2005.
I. Hwang, H. Balakrishnan, and C. Tomlin, "Performance Analysis of Hybrid Estimation Algorithms," In the Proceedings of the 42nd IEEE Conference on Decision and Control, Maui, Hawaii, December 2003.
M. Oishi, I. Hwang, and C. Tomlin, "Immediate Observability of Discrete Event Systems with Application to User-Interface Design," In the Proceedings of the 42nd IEEE Conference on Decision and Control, Maui, Hawaii, December 2003.
I. Hwang, H. Balakrishnan, and C. Tomlin, "Observability Criteria and Estimator Design for Stochastic Linear Hybrid Systems," In the Proceedings of the IEE European Control Conference, Cambridge, UK, September 2003.

Multiple-Target Tracking and Identity Management

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

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.
S. Oh, I. Hwang, K. Roy, and S. Sastry, "A Fully Automated Distributed Multiple-Target Tracking and Identity Management Algorithm, " In the Proceedings of the AIAA Guidance, Navigation, and Control Conference, San Francisco, CA, August 2005.
I. Hwang, K. Roy, H. Balakrishnan, and C. Tomlin, "A Distributed Multiple-Target Identity Management Algorithm in Sensor Networks ," In the Proceedings of the 43rd IEEE Conference on Decision and Control, Atlantis, Paradise Island, Bahamas, December 2004.
H. Balakrishnan, I. Hwang, and C. Tomlin, "Polynomial Approximation Algorithm for Belief Matrix Maintenance in Identity Management," In the Proceedings of the 43rd IEEE Conference on Decision and Control, Atantis, Paradise Island, Bahamas, December 2004.
I. Hwang, H. Balakrishnan, K. Roy, and C. Tomlin, "Multiple-Target Tracking and Identity Management in Clutter for Air Traffic Control," In the Proceedings of the AACC American Control Conference, Boston, MA, June 2004.
I. Hwang, H. Balakrishnan, K. Roy, J. Shin, L. Guibas, and C. Tomlin, "Multiple-Target Tracking and Identity Management Algorithm for Air Traffic Control," In the Proceedings of the 2nd IEEE Sensors, Toronto, Canada, October 2003.

    Air Traffic Management

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, Hillton 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.
J. Li and I. Hwang, "Algorithms for Uncertainty Analysis of An Air Traffic Management System," In the Proceedings of the AIAA Guidance, Navigation, and Control Conference, 2008.
I. Hwang, J. Hwang, and C. Tomlin, "Flight-Mode-Based Aircraft Conflict Detection using a Residual-Mean Interacting Multiple Model Algorithm, " In the Proceedings of the AIAA Guidance, Navigation, and Control Conference, Austin Texas, August 2003.
I. Hwang and C. Tomlin, "Protocol-based Conflict Resoluiton for Finite Information Horizon," In the Proceedings of the AACC American Control Conference, Anchorage, May 2002.

Space Applications

R. Huang, I. Hwang and M. Corless, "A New Nonlinear Model Predictive Control Algorithm Using Differential Transformation with Application to Interplanetary Low-Thrust Trajectory Tracking," In the Proceedings of the AACC American Control Conference, St. Louis, MO, June 2009.
R. Huang, I. Hwang, and M. Corless, "Application of a New Differential Transformation Based Algorithm to Interplanetary Optimal Low-Thrust Transfers," In the Proceedings of the AIAA/AAS Astrodynamics Specialist Conference, 2008.

Numerical (approximation) Algorithms for Optimal Control

D. Du, J. Li, and I. Hwang, "A Computational Method For Optimal Control of Hybrid Systems Using Differential Transformation," In the Proceedings of the 46th IEEE Conference on Decision and Control, 2007.
J. Li, D. Du and I. Hwang, "A Differential Transform Based Computational Method For Switched Linear Quadratic Optimal Control," In the Proceedings of the 46th IEEE Conference on Decision and Control, 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.
D.M. Stipanovic, I. Hwang, and C. Tomlin, "Computation of an Over-Approximation of the Backward Reachable Set using Subsystem Level Set Functions," In the Proceedings of the IEE European Control Conference, Cambridge, UK, September 2003.
I. Hwang, D.M. Stipanovic, and C. Tomlin, "Applications of Polytopic Approximations of Reachable Sets to Linear Dynamic Games and a Class of Nonlinear Systems," In the Proceedings of the AACC American Control Conference, Denver, June 2003.

Guidance and Navigation & UAV systems

M.J. Tahk, B.K. Park, and I. Hwang, "Performance Comparison of the Optimal Guidance Law and Proportional Navigation for Missile Homing," The 32st SICE Annual Conference, Kanazawa, Japan, August, 1993
M.J. Tahk, B.K. Park, B.C. Sun, I. Hwang, H. Cho, and T.L. Song, "The Closed-Form Solution and its Approximation of the Optimal Guidance Law," The 12th World Congress of IFAC, Sydney, Australia, July, 1993

Technical Reports

I. Hwang and C. Tomlin,
Protocol-based Conflict Resolution for Air Traffic Control
Technical Report, SUDAAR-762, Department of Aeronautics and Astronautics, Stanford University, July 2002.

Thesis

M.S.

Jeeyeon Hahn, "A Rule-Based Conflict Resolution Algorithm for the Next Generation Air Transportation System", Spring 2008.

Javier Lovera Yepes, "Pilot’s Intent Inference and Aircraft Trajectory Prediction with Applications to Air Traffic Control", Fall 2005.

Invited Presentation (not including conference presentations)

2008

I. Hwang, Decision Supporting Tools for the Next Generation Air Transportation System (NextGen), Korea Aerospace Research Instutite, Korea, July 2008.

I. Hwang, Decision Supporting Tools for the Next Generation Air Transportation System (NextGen), Dept. of Aerospace Engineering, Chungnam National University, Korea, July 2008

I. Hwang, Decision Supporting Tools for the Next Generation Air Transportation System (NextGen), Dept. of Aerospace Engineering, KAIST, Korea, July 2008

I. Hwang, Decision Supporting Tools for the Next Generation Air Transportation System (NextGen), School of Mechanical and Aerospace Engineering, 3Seoul National University, Korea, July 2008

2007

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.

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

I. Hwang, Hybrid Estimation: Application to Air Traffic Control, Dept. of Aeronautics and Astronautics, Ohio State University, Columbus, OH, May, 2007.

2006

I. Hwang, Hybrid Systems Approach for Complex Networked Systems, Raytheon, Fort Wayne, IN, June, 2006.

I. Hwang, Hybrid Systems Approach for Complex Networked Systems with Application to Air Traffic Control, AFOSR System-of-Systems Workshop, Indianapolis, IN, May, 2006.

I. Hwang, Pilot's Intent Inference and Aircraft Trajectory Prediction with Applications to Air Traffic Control, Coodinated Science Laboratory, University of Illinois at Urbana-Champaign, IL, April 2006.

2005

I. Hwang, Control in Information Rich World: Application to Air Traffic Control, Korea Aerospace Research Institute (KARI), Taejon, Korea, August 2005.

I. Hwang, Control in Information Rich World: Application to Air Traffic Control, Division of Aerospace Engineering in the School of Mechanical Engineering, KAIST, Taejon, Korea, August 2005.

I. Hwang, Control in Information Rich World: Application to Air Traffic Control, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, Korea, July 2005.

2004

I. Hwang, Air Traffic Surveillance and Control using Hybrid Estimation and Protocol-Based Conflict Resolution, School of Aeronautics and Astronautics, Purdue University, April 2004.
H. Balakrishnan, I. Hwang, and C. Tomlin, Information Inference for Autonomous Stochastic Linear Hybrid Systems, NASA Joint University Program, NASA Ames, CA, January 2004.

2003

H. Balakrishnan, I. Hwang, and C. Tomlin, Inference Methods for Autonomous Stochastic Linear Hybrid Systems, ETHZ/Stanford/UBC Hybrid Systems Seminar, Stanford, CA, December 2003.
I. Hwang, H. Balakrishnan, K. Roy, and C. Tomlin, Multiple-Target Tracking and Identity Management for Air Traffic Control, NASA Joint University Program, UCLA, Los Angeles, CA, September 2003.
H. Balakrishnan, I. Hwang, and C. Tomlin, Inference Methods for Stochastic Hybrid Systems, MURI-ONR Meeting, Stanford, CA, July 2003.
I. Hwang, H. Balakrishnan, and C. Tomlin, Hybrid Estimation Algorithm and Related Work, MURI Meeting, Stanford, CA, June 2003.
I. Hwang, H. Balakrishnan, J. Kim, and C. Tomlin, Flight-Mode-Based Conflict Detection using a Residual-Mean Interacting Multiple Model, DARPA Software Enabled Control Meeting, Stanford, CA, April 2003.
I. Hwang, J. Hwang, and C. Tomlin, Flight-Mode-Based Conflict Detection using a Residual-Mean Interacting Multiple Model, NASA Joint University Program, Stanford, CA, March 2003.
I. Hwang and C. Tomlin, Protocol-Based Conflict Resolution for Air Traffic Control, Seminar at Seagull Technology Inc., Cupertino, CA, April 2003.

My Thesis

I. Hwang and C. Tomlin,
Air Traffic Surveillance and Control using Hybrid Estimation and Protocol-Based Conflict Resolution,
Ph.D. Thesis, Stanford University, 2003
I. Hwang and M.J. Tahk,
A Study on the Attitude Control of a Flexible Satellite,
M.S. Thesis, KAIST, Korea, Feburary, 1994