2004 - Assistant Professor

 

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:

 

315 N. Grant Street

West Lafayette, IN 47907-2023

 

Office Phone: +1 765 49-40687

Email: ihwang@purdue.edu

Webpage: http://roger.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.

 

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:

 

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 Verlag, March 2004.

 

I. Hwang, D.M. Stipanovic, and C. Tomlin, "Polytopic Approximation of Reachable 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.

 

D.M. Stipanovic, I. Hwang, and C. Tomlin, "Computation of an Over-Approximation of the Backward Reachable Set using Subsystem Level Set Functions," Dynamics of Continuous, Discrete, and Impulsive Systems, Series A: Mathematical Analysis, 11, pp. 399-411, December, 2003.

 

I. Hwang, H. Balakrishnan, and C. Tomlin, "State Estimation for Hybrid Systems: Applications to Aircraft tracking," IEE Proceedings of Control Theory and Applications, 2005, accepted.

 

Conference Proceedings, Presentations, Invited Lectures:

 

I. Hwang, H. Balakrishnan, K. Roy, and C. Tomlin, "Multiple-Target Tracking and Identity Management in Clutter, with Application to Aircraft Tracking," In the Proceedings of the AACC American Control Conference, Boston, MA, June 2004.

 

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, Atlantis, Paradise Island, Bahamas, December 2004.

 

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.

 

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.

 

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.

 

H. Balakrishnan, I. Hwang, and C. Tomlin, "Information Inference for Autonomous Stochastic Linear Hybrid Systems," NASA Joint University Program, NASA Ames, CA, January 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.

 

I. Hwang, "New Air Traffic Surveillance and Control Techniques," Seagull Technology Campbell, CA , May 2004.

 

H. Balakrishnan, I. Hwang, and C. Tomlin, "Inference Methods for Autonomous Stochastic Linear Hybrid Systems," ETHZ/Stanford/UBC Hybrid Systems Seminar Stanford, CA, December 2004.

 

I. Hwang, "Control in Information Rich World: From Formation Flying of UAVs to Air Traffic Control," Lockheed Martin Meeting, Purdue University, February 11, 2005.

 

I. Hwang, "Control in Information Rich World: From Formation Flying of UAVs to Air Traffic Control," NASA Workshop, Purdue University, June 17, 2005.

 

I. Hwang, "Control in Information Rich World: Application to Air Traffic Control," Korea Aerospace Research Institute (KARI), Taejon, Korea, August 3, 2005.

 

I. Hwang, "Control in Information Rich World: Application to Air Traffic Control," Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, 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, August 2005.

Flight Dynamics & Control/Hybrid System Laboratory