**Control Systems**
**Refereed Publications (1991-1997)**

L.H. Keel, K. Lim, and J.-N. Juang, "Robust Eigenvalue Assignment with Maximum Tolerance to
System Uncertainties", *AIAA Journal of Guidance, Controls and Dynamics*, vol. 14, no. 3, pp.
615 - 620, May-June 1991.

L.H. Keel and S.P. Bhattacharyya, "Frequency Domain Design of Interval Controllers", *Control of
Uncertain Dynamic Systems*, pp. 423 - 438, CRC Press, 1991.

L.H. Keel and S.P. Bhattacharyya, "Extremal Gain and Phase Margins for Interval Plants",
*International Workshop on Robust Control*, San Antonio, TX., March 1991.

L.H. Keel and S.P. Bhattacharyya, "Optimum Design of Robust One-Parameter Controllers for
Interval Plants", *Proceedings of the 1991 IFAC Symposium on Design Methods for Control
Systems*, Zurich, Switzerland, September 4 - 6, 1991.

L.H. Keel and S.P. Bhattacharyya, "Extremal Gain and Phase Margins for Interval Systems",
*Proceedings of the 1991 AIAA Guidance, Navigation and Control Conference*, New Oleans,
LA., August 1991.

H. Chapellat, L.H. Keel and S.P. Bhattacharyya, "Stability Margin for Multilinear Interval Control
Systems", *Proceedings of the 1991 IEEE Conference on Decision and Control*, Brighton,
United Kingdom, December 1991.

Lew, J.-S., Juang J.-N., and R. W., ``Comparison of Several System Identification Methods for
Flexible Structures,'' , *Proceedings of the 32nd AIAA Structures, Structural Dynamics, and
Materials Conference*, 1991.

Longman R. W., Lew, J.-S., Tseng, D.-H., and Juang J.-N., ``Variance and Bias Computation for
Improved Modal Identification Using ERA/DC,'' *Proceedings of American Control Conference*,
1991.

Mook, D.-J., and Lew, J.-S., ``Multiple Shooting Algorithms for Jump-Discontinuous Problems in
Optimal Control and Estimation,'' *IEEE Transactions on Automatic Control*, 1991.

Mook, D.-J., and Lew, J.-S., ``An Existence and Uniqueness Proof for the Minimum Model Error
Optimal Estimation Algorithm,'' *Journal of Guidance, Control, and Dynamics*, 1991.

G. S. Ladde and S.Sathananthan, "Periodic Boundary Value Problem for Impulsive
Integro-Differential Equations", *Journal Mathematics and Physical Sciences*, vol. 25, pp. 119 -
129, 1991.

S. Sathananthan and R. Pirapakaran, "Generalized Variation of Constants Formula and
Perturbations of Linear Integro-differential Equations ", *Texas Journal of Science*, vol. 43, pp. 165
- 171, 1991.

S. Ahmad,"Parallel Computer Implementation of Parametric Robust Control" ACM Mid-Southeast
Chapter, Gatlinburg, TN, November, 1991.

S.P. Bhattacharyya and L.H. Keel, "Robust Stability and Control of Linear and Multilinear Interval
Systems", *Control and Dynamic Systems*, vol. 51, Part 2, pp. 31 - 77, Academic Press, 1992.

S. Ahmad, L.H. Keel and S.P. Bhattacharyya, "Computer Aided Robust Control Design for
Interval Control Systems", *Proceedings of the 1992 IEEE Symposium on Computer Aided
Control System Design*;, Napa, CA., March 1992.

L.H. Keel, J. Shaw and S.P. Bhattacharyya, "Robust Control of Interval Systems", in *Robust
Control*, pp. 24 - 31, Springer Verlag, 1992.

S. Ahmad, L.H. Keel, and S.P. Bhattacharyya, "Robust PID Control and Lead-Lag Compensation
for Linear Interval Systems", *Robustness of Dynamic Systems with Parameter Uncertainties*,
pp. 251 - 260, Birhauser Press, 1992.

H. Chapellat, L.H. Keel, and S.P. Bhattacharyya, "Robustness Properties of Multilinear Interval
Systems", *Robustness of Dynamic Systems with Parameter Uncertainties*, pp. 73 - 80,
Birhauser Press, 1992.

L.H. Keel and S.P. Bhattacharyya, "Control System Design for Parametric Uncertainty",
*Proceedings of the 1st Quantitative Feedback Theory Symposium*, Wright Pattersen Air Force
Base, OH, August 3 - 4, 1992.

Longman, R., Lew, J.-S., and Juang, J.-N., ``Comparison of Candidate Methods to Distinguish
Noise Modes from System Modes in Structural Identification,'' *Proceeding of the 1992
AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference*,
April 13-15, 1992.

Lew, J.-S., and Mook, D. J., ``Jump Discontinuous Two Point Boundary Value Problems in
Optimal Control,''* Proceedings of the 1992 American Control Conference*.

G. S. Ladde and S. Sathananthan, "Ito-Type Systems of Stochastic Integro-Differential Equations",
*Integral Methods in Science and Engineering-90, Hemisphere Publishing Company*, pp.
75-89, 1992.

G. S. Ladde and S. Sathananthan, "Error Estimates and Stability of Nonlinear Stochastic
Integro-Differential Equations", *Journal of Applicable Analysis*, vol. 43, pp. 163-189, 1992.

G. S. Ladde, S. Sathananthan, and M. Sambandham"Comparison Theorem and Applications ",
*International Series of Numerical Mathematics,*, vol. 103, pp. 321-342, 1992.

G. S. Ladde and S. Sathananthan, "Stochastic Integro-Differential Equations with Random
Parameters-I, ", *Dynamic Systems and Applications, *, vol. 1, pp. 369-390, 1992.

G. S. Ladde and S. Sathananthan, "Stability of a Lotka-Volterra Model", *Journal of Mathematics
and Computer Modeling*, vol. 16, N0. 3, pp. 99-107, 1992.

S. Ahmad and L.H. Keel, "Robust Lead-Lag Compensation for a Family of Uncertain Linear
Systems", International Symposium on Circuits and Systems, San Diego, May 1992.

L.H. Keel and S.P. Bhattacharyya, "Stability Margins for Multilinear Interval Systems via Phase
Conditions: A Unified Approach", *Proceedings of the 1993 American Control Conference*, San
Francisco, CA, June 2 - 4, 1993.

L.H. Keel and S.P. Bhattacharyya, "Vertex Results in Robust Stability", *Proceedings of the 1993
IFAC World Congress*, Sydney, Australia, July 19 - 23, 1993.

L.H. Keel and S.P. Bhattacharyya, "Parametric Stability Margin for Multilinear Interval Control
Systems", *Proceedings of the 1993 American Control Conference*, San Francisco, CA, June 2 -
4, 1993.

J.S. Lew, L.H. Keel, and J-N. Juang, "Quantification of Model Error via an Interval Model with
Nonparametric Error Bound", *Proceedings of the 1993 AIAA Guidance, Navigation, and
Control Conference*, Montery, CA, August, 1993.

S.P. Bhattacharyya and L.H. Keel, "Comments on `Extreme Point Results for Robust Stabilization
of Interval Plants with First Order Compensators", *IEEE Transactions on Automatic Control*,
vol. 38, no. 11, pp. 1734 - 1735, November 1993.

S. Bhattacharya, L.H. Keel, and S.P. Bhattacharyya, "Robust Stabilizer Synthesis for Interval
Plants Using Nevanlina-Pick Theory", *Proceedings of the 32nd IEEE Conference on Decision
and Control*, San Antonio, TX, December 15 - 17, 1993.

Lew, J.-S., Juang J.-N., and Longman R. W., ``Comparison of Several System Identification
Methods for Flexible Structures,'' *Journal of Sound and Vibration*, Vol. 167, No. 3, 1993, pp.
461-480.

Lew, J.-S.,``Application of Singular Value Decomposition for Static Equilibrium Analysis of
Mechanical Systems'', *1993 ASME Design Automation Conference*, DE-Vol. 65-2,
Albuquerque, NM, Sep. 19-22, 1993.

L.H. Keel and S.P. Bhattacharyya, "Control System Design for Parametric Uncertainty",
*International Journal of Robust and Nonlinear Control*, vol. 4, pp. 87 - 100, April 1994.

J.S. Lew, T.L. Link, E. Garcia, and L.H. Keel, "Interval Model Identification for Flexible Structures
with Uncertain Parameters", *Proceedings of the 1994 AIAA/ASME Adaptive Structures Forum*,
Hilton Head, SC, April 21 - 22, 1994.

H. Chapellat, L.H. Keel, and S.P. Bhattacharyya, "Extremal Robustness of Multilinear Interval
Systems", *Automatica*, vol. 30, no. 6, pp. 1037 - 1042, June 1994.

L.H. Keel, J.S. Lew, and S.P. Bhattacharyya, "System Identification Using Interval Dynamic
Models", *Proceedings of the 1994 American Control Conference*, Baltimore, MD, June 29 -
July 1, 1994.

L.H. Keel and S.P. Bhattacharyya, "Robust Stability of Interval Matrices: A Computational
Approach", *Proceedings of the 1994 Asian Control Conference*, Tokyo, Japan, July 27 - 30,
1994.

L.H. Keel and S.P. Bhattacharyya, "Robust Stability of Interval Matrices: A Computational
Approach", *Proceedings of the 1994 Asian Control Conference*, Tokyo, Japan, July 27 - 30,
1994.

L.H. Keel and S.P. Bhattacharyya, "Robust Parametric Classical Control Design", *IEEE
Transactions on Automatic Control*, vol. 39, no. 7, pp. 1524 - 1530, July 1994.

J.S. Lew, L.H. Keel, and J-N Juang, "Quantification of Model Error via an Interval Model with
Nonparametric Error Bound", *AIAA Journal of Guidance, Controls, and Dynamics*, vol. 17, no.
6, pp. 1212 - 1218, November - December 1994.

Link, T., Lew, J.-S., Garcia, E., and Keel L. H., ``Robustness Verification for Flexible Structures
via Interval Control Systems,''* Proceedings~ of ~AIAA~ Guidance,~ Navigation,~ and~
Control~ Conference*, Scottsdale, August 1-3, 1994.

G. S. Ladde and S. Sathananthan, "Stochastic Integro-Differential Equations with Random
Parameters-II", *Dynamic Systems and Applications*, vol. 3, pp. 563 - 582, 1994.

G. S. Ladde and S. Sathananthan, "Stability and Error Estimates of Stochastic Integro-Differential
Equations", *Proceedings of the Eleventh Army Conference in Applied Mathematics and
Computation*, pp. 691-698, 1994.

G. S. Ladde, S. Sathananthan, and R. Pirapakaran, "Numerical Treatment of Random Differential
Equations", *Proceedings of the Eleventh Army Conference in Applied Mathematics and
Computation*, pp. 699 - 712, 1994.

G. S. Ladde and S.Sathananthan, "Diagonalization and Stability of Two-Time Scale Singularly
Perturbed Linear Integro-Differential Equations", *Proceedings of the Eleventh Army Conference
in Applied Mathematics and Computation*, pp. 713-720, 1994.

G. S. Ladde, S. Sathananthan, and M. V. Moorthy"Periodic Boundary Value Problems for Second
Order Integro-Differential Equations of Volterra-Type,", *Proceedings of the 1st International
Conference in Dynamic Systems and Applications*, Vol. 1, pp. 191-198, 1994.

L.H. Keel and S.P. Bhattacharyya, "Phase Properties of Hurwitz Polynomials", *Proceedings of the
34th IEEE Conference on Decision and Control*, New Orleans, LA, December 13 - 15, 1995.

L.H. Keel and S.P. Bhattacharyya, "Robust Stability of Interval Matrices: A Computational
Approach", *International Journal of Control*, vol. 62, no. 6, pp. 1491 - 1506, December 1995.

Lew, J.-S., ``Using Transfer Function Parameter Changes for Damage Detection of Structures,''
*AIAA Journal*, Vol. 33, No. 11, 1995, pp. 2189-2193.

Lew, J.-S., ``Comparison of Interval Modeling Techniques for Structures with Uncertain
Parameters,'' *5th International Conference on Adaptive Structures*, Technomic Publishing Co.,
Inc., 1995, pp. 194-205.

M. V. Moorthy, S. Sathananthan, and G. S. Ladde, "Periodic Boundary Value Problems for
Second Order Impulsive Integro-Differential Equations", *Journal of Applicable Analysis*, vol. 58,
pp. 187-197, 1995.

G. S. Ladde and S.Sathananthan, "Stability Analysis of Hereditary Iterative Processes ",*Journal of
Applied Mathematics and Computation*, vol. 73 pp. 39-54, 1995.

G. S. Ladde, S. Sathananthan, and R. Pirapakaran"Numerical Treatment of Random Population
Models ", *Proceedings of Neural, Parallel and Scientific Computations*, vol.1, pp. 257-260,
1995.

L.H. Keel and S.P. Bhattacharyya, "Phase Properties of Hurwitz Polynomials", *IEEE
Transactions on Automatic Control*, vol. 41, no. 5, pp. 733 - 734, May 1996.

Y.C. Kim and L.H. Keel, "Robust Stabilization of a Magnetic Levitation Vehicle", *Proceedings of
the 1996 International Symposium on Intelligent Automation and Control*, Montpellier,
France, May 27 - 30, 1996.

T.L. Link, J.S. Lew, E. Garcia, and L.H. Keel, "Interval Model Identification and Robustness
Analysis for Uncertain Flexible Structures", *IEEE Transactions on Control Systems Technology*,
vol. 4, no. 4, pp. 411 - 418, July 1996.

Lew, J.-S., ``Torque Converter Clutch Slip Control with Friction Uncertainty,'' SAE paper
960432, 1996.

J.S. Lew, S. Sathananthan, and Gu Yan, "Comparison of Damage Detection Algorithm Using Time
Domain Data", *Proceedings of the Fifteenth International Modal analysis Conference*,
Orlando, Florida,February 3-6, 1996.

L.H. Keel, J.W. Howze, and S.P. Bhattacharyya, "Robust Tracking and Disturbance Rejection
with Two DOF Controllers and Distributed Internal Models", *Proceedings of the 1997 American
Control Conference*, Albuiquerque, NM, June 4 - 6, 1997.

L.H. Keel and S.P. Bhattacharyya, "Robust, Fragile or Optimal?", *Proceedings of the 1997
American Control Conference*, Albuiquerque, NM, June 4 - 6, 1997.

Lew, J.-S., and Lim, K. B., ``Model Reduction of Interval System for Robust Control,'' *16th
ASME Biennial Conference*, September 14-17,1997.

Lew, J.-S., ``Transfer Function Parameter Changes Due to Structural Damage,'' *1997
AIAA/ASME/AHS Adaptive Structures Forum*, Kissimmee, Florida, April 7-10, 1997.

Lew, J.-S., Sathananthan, S., and Gu, Y., ``Comparison of Damage Detection Algorithms Using
Time Domain Data,'' *15 International Modal Analysis Conference*, Orlando, Florida, February
3-6, 1997.