Revised: August 3, 2008




Publications



      2009


    1. H. Zhang, W. S. Gray, O. R. González, and A. V. Lakdawala, `Output Tracking Performance of a Recoverable Digital Flight Control System in Neutron Environments,' IEEE Transactions on Aerospace and Electronic Systems, vol. 45, no. 1, January 2009, to appear.

    2. A. Tejada, O. R. González, and W. S. Gray, `On Nonlinear Discrete-Time Systems Driven by Markov Chains,' Journal of the Franklin Institute, under review.

      2008


    3. H. Zhang, W. S. Gray, and O. R. González, `Performance Analysis of Digital Flight Control Systems with Rollback Error Recovery Subject to Simulated Neutron-Induced Upsets,' IEEE Transactions on Control Systems Technology, vol. 16, no. 1, January 2008, pp. 46-59.

    4. W. S. Gray and Y. Wang, `Noncausal Fliess Operators and Their Shuffle Algebra,' International Journal of Control (special issue for the occasion of M. Fliess's 60th birthday), vol. 81, no. 3, March 2008, pp. 344-357.

    5. W. S. Gray and Y. Wang, `Formal Fliess Operators with Applications to Feedback Interconnections,' Proc. 2008 International Symposium on the Mathematical Theory of Networks and Systems, Blacksburg, Virginia, 2008.

    6. J. R. Chávez-Fuentes, O. R. González, and W. S. Gray, `Towards a Metric for the Assessment of Safety Critical Control Systems,' AIAA Guidance, Navigation and Control Conference, Honolulu, Hawaii, 2008, to appear.

    7. W. S. Gray, R. Wang, and O. R. González, `A Performance Model for a Distributed Flight Control System Subject to Random Upsets,' IEEE Conference on Control Applications, San Antonio, Texas, 2008, pp. 918-923.

    8. A. Tejada, H. Herencia-Zapana, O. R. González, and W. S. Gray, `Mean Square Stability Analysis of Sampled-Data Supervisor Control Systems,' IEEE Conference on Control Applications, San Antonio, Texas, 2008, pp. 37-42.

    9. J. R. Chávez-Fuentes, O. R. González, and W. S. Gray, `Transformations of Markov Processes in Fault Tolerant Interconnected Systems,' IEEE Conference on Control Applications, Late News Paper, San Antonio, Texas, 2008, to appear.

    10. A. Tejada, O. R. González, and W. S. Gray, `Stability of Digital Control Systems Implemented in Error-Recoverable Computers,' International Journal of Control, 2008, to appear.

    11. W. S. Gray, H. Herencia-Zapana, L. A. Duffaut Espinosa, and O. R. González, `On Cascades of Bilinear Systems and Generating Series of Weighted Petri Nets,' Proc. 47th IEEE Conference on Decision and Control, Cancun, Mexico, 2008, to appear.

      2007


    12. L. A. Duffaut Espinosa, W. S. Gray, and O. R. González, `On the Rationality of the Composition Product: A Survey,' Proc. 39th IEEE Southeastern Symposium on System Theory, Macon, Georgia, 2007, pp. 238-243.

    13. J. R. Chavez-Fuentes, O. R. González, and W. S. Gray, `A Black-Scholes Approach to Satisfying the Demand in a Failure-Prone Manufacturing System,' Proc. 39th IEEE Southeastern Symposium on System Theory, Macon, Georgia, 2007, pp. 154-158.

    14. A. Tejada, H. Herencia-Zapana, O. R. González, and W. S. Gray, `Mean Square Stability Analysis of Hybrid Jump Linear Systems Using a Markov Kernel Approach,' Proc. 2007 American Control Conference, New York City, New York, 2007, pp. 3482-3487.

    15. W. S. Gray and O. R. González, `Advanced Concepts for Recoverable Controllers in Safety Critical Systems,' NASA Contractor Report NNL04AA03A, NASA Langley Research Center, Hampton, Virginia, 2007.

    16. L. A. Duffaut Espinosa, W. S. Gray, and O. R. González, `On the Bilinearity of Cascaded Bilinear Systems,' Proc. 46th IEEE Conference on Decision and Control, New Orleans, Louisiana, 2007, pp. 5581-5587.

    17. A. Tejada, O. R. González, and W. S. Gray, `Stability Analysis of Hybrid Jump Linear Systems with Markov Inputs,' Proc. 46th IEEE Conference on Decision and Control, New Orleans, Louisiana, 2007, pp. 6280-6285.

    18. H. Herencia-Zapana, O. R. González, and W. S. Gray, `Dynamically Colored Petri Net Representation of Nonlinear Sampled-Data Systems with Embedded Recovery Algorithms,' Proc. 46th IEEE Conference on Decision and Control, New Orleans, Louisiana, 2007, pp. 97-102.

      2006


    19. A. Tejada, O. R. González, and W. S. Gray, `A Measure-Theoretic Proof of the Markov Property for Hybrid Systems with Markovian Inputs,' Proc. 38th IEEE Southeastern Symposium on System Theory, Cookeville, Tennessee, 2006, pp. 328-332.

    20. A. V. Lakdawala, H. Zhang, O. R. González, and W. S. Gray, `Markovian Statistical Data Analysis of Single-Event Upsets Triggered by High Intensity Neutrons,' Proc. 38th IEEE Southeastern Symposium on System Theory, Cookeville, Tennessee, 2006, pp. 349-353.

    21. H. Herencia-Zapana, O. R. González, and W. S. Gray, `Invariant Measures of Nonlinear Sampled Data Systems with a Jump Linear Controller,' 9th International Workshop on Hybrid Systems: Computation and Control, Santa Barbara, California, poster session, 2006.

    22. W. S. Gray and E. I. Verriest, `Balanced Realizations Near Stable Invariant Manifolds,' Automatica, vol. 42, no. 4, April 2006, pp. 653-659.

    23. A. Tejada, O. R. González, and W. S. Gray, `On the Markov Property for Nonlinear Discrete-Time Systems with Markovian Inputs,' Proc. 2006 American Control Conference, Minneapolis, Minnesota, 2006, pp. 899-904.

    24. Y. Li and W. S. Gray, `The Formal Laplace-Borel Transform of Fliess Operators and the Composition Product,' International Journal of Mathematics and Mathematical Sciences, vol. 2006, Article ID 34217, 2006, pp. 1-14.

    25. W. S. Gray and Y. Wang, `Noncausal Fliess Operators and Their Shuffle Algebra,' Proc. 2006 International Symposium on the Mathematical Theory of Networks and Systems, Kyoto, Japan, 2006, pp. 2805-2813.

    26. E. I. Verriest and W. S. Gray, `Geometry and Topology of the State Space via Balancing,' Proc. 2006 International Symposium on the Mathematical Theory of Networks and Systems, Kyoto, Japan, 2006, pp. 840-848 (invited).

    27. W. S. Gray and O. R. González, `System Level Effects of Neutron-Induced Single Event Upsets (SEU's) on Digital Flight Control Systems,' NASA Contractor Report NCC-1-03026, NASA Langley Research Center, Hampton, Virginia, 2006.

    28. W. S. Gray and E. I. Verriest, `Algebraically Defined Gramians for Nonlinear Systems,' Proc. 45th IEEE Conference on Decision and Control, San Diego, California, 2006, pp. 3730-3735.

    29. H. Herencia-Zapana, O. R. González, and W. S. Gray, `Towards a Theory of Sampled-Data Piecewise-Deterministic Markov Processes,' Proc. 45th IEEE Conference on Decision and Control, San Diego, California, 2006, pp. 944-949.

      2005


    30. W. S. Gray and J. M. A. Scherpen, `Hankel Singular Value Functions from Schmidt Pairs for Nonlinear Input-Output Systems,' Systems and Control Letters, vol. 54, no. 2, February 2005, pp. 135-144.

    31. W. S. Gray and Y. Li, `On Feedback Connections of Analytic Nonlinear Systems and Combinatorics on Words,' Proc. 37th IEEE Southeastern Symposium on System Theory, Tuskegee, Alabama, 2005, pp. 429-434.

    32. H. Zhang, W. S. Gray, and O. R. González, `Performance Analysis of Recoverable Flight Control Systems Using Hybrid Dynamical Models,' Proc. 2005 American Control Conference, Portland, Oregon, 2005, pp. 2787-2792.

    33. A. Tejada, O. R. González, and W. S. Gray, `Asymptotic and Mean Square Stability Conditions for Hybrid Jump Linear Systems with Performance Supervision,' Proc. 2005 American Control Conference, Portland, Oregon, 2005, pp. 569-574.

    34. H. Zhang, W. S. Gray, and O. R. González, `Performance Analysis and Validation of a Recoverable Flight Control System in a Simulated Neutron Environment,' Proc. 2005 Guidance, Navigation and Control Conference, San Francisco, California, 2005, Paper 2005-6430 (invited).

    35. W. S. Gray and Y. Li, `Generating Series for Interconnected Analytic Nonlinear Systems,' SIAM Journal on Control and Optimization, vol. 44, no. 2, 2005, pp. 646-672.

    36. W. S. Gray and Y. Li, `Local Convergence of the Feedback Product via the Asymptotics of the Catalan Numbers,' Proc. 44th IEEE Conference on Decision and Control and 2005 European Control Conference, Seville, Spain, 2005, pp. 6140-6145.

      2004


    37. Y. Li and W. S. Gray, `The Formal Laplace-Borel Transform, Fliess Operators and the Composition Product,' Proc. 36th IEEE Southeastern Symposium on System Theory, Atlanta, Georgia, 2004, pp. 333-337.

    38. H. Zhang, W. S. Gray, and O. R. González, `Markov Jump-Linear Performance Models for Recoverable Flight Control Computers,' Proc. 36th IEEE Southeastern Symposium on System Theory, Atlanta, Georgia, 2004, pp. 408-412.

    39. O. R. González, H. Herencia-Zapana, and W. S. Gray, `Stochastic Stability of Sampled Data Systems with a Jump Linear Controller,' Proc. 36th IEEE Southeastern Symposium on System Theory, Atlanta, Georgia, 2004, pp. 256-260.

    40. W. S. Gray, `Book Review: Nonlinear System Identification - Input-Output Modeling Approach, Volumes 1&2 by R. Haber and L. Keviczky,' Automatica, 2004, pp. 901-903.

    41. S. Patilkulkarni, H. Herencia-Zapana, W. S. Gray, and O. R. González, `On the Stability of Jump-Linear Systems Driven by Finite-State Machines with Markovian Inputs,' Proc. 2004 American Control Conference, Boston, Massachusetts, 2004, pp. 2534-2539.

    42. A. Tejada, O. R. González, and W. S. Gray, `Towards Stability Analysis of Jump Linear Systems with State-Dependent and Stochastic Switching,' Proc. 2004 American Control Conference, Boston, Massachusetts, 2004, pp. 1893-1898.

    43. W. S. Gray and E. I. Verriest, `Balanced Realizations Near Stable Invariant Manifolds,' Proc. 2004 International Symposium on the Mathematical Theory of Networks and Systems, Leuven, Belgium, 2004 (invited).

    44. O. R. González, H. Herencia-Zapana, and W. S. Gray, `Stochastic Stability of Nonlinear Sampled Data Systems with a Jump Linear Controller,' Proc. 43rd IEEE Conference on Decision and Control, The Atlantis Paradise Island, The Bahamas, 2004, pp. 4128-4133.

    45. E. I. Verriest and W. S. Gray, `Balanced Nonlinear Realizations,' Proc. 43rd IEEE Conference on Decision and Control, The Atlantis Paradise Island, The Bahamas, 2004, pp. 1164-1169.

      2003


    46. W. S. Gray, S. Patilkulkarni, and O. R. González, `Stochastic Stability of a Recoverable Computer Control System Modeled as a Finite-State Machine,' Proc. 2003 American Control Conference, Denver, Colorado, 2003, pp. 2240-2245.

    47. Y. Li, M. Song, and W. S. Gray, `A Self-Adaptive Predictive Congestion Control Model for Extreme Networks,' Proc. 2003 International Conference on Computer, Communication and Control Technologies, Orlando, Florida, 2003, pp. 327-332.

    48. K. Eure, C. M. Belcastro, W. S. Gray, and O. R. González, `Neutron Particle Effects on a Quad-Redundant Flight Control Computer,' Proc. 2003 Digital Avionics Systems Conference, Indianapolis, Indiana, 2003, pp. 1.B.2-1-8.

    49. W. S. Gray and O. R. González, `Stochastic Dynamical Models for Digital Control Systems in Electromagnetic Environments (EME),' NASA Contractor Report NCC-1-392, NASA Langley Research Center, Hampton, Virginia, 2003.

    50. W. S. Gray, H. Zhang, and O. R. González, `Closed-Loop Performance Measures for Flight Controllers Subject to Neutron-Induced Upsets,' Proc. 42nd Conference on Decision and Control, Maui, Hawaii, 2003, pp. 2465-2470.

      2002


    51. W. S. Gray and Y. Li, `Fliess Operators in Cascade and Feedback Systems,' Proc. 2002 Conference on Information Sciences and Systems, Princeton, New Jersey, 2002, pp. 173-178.

    52. W. S. Gray and J. M. A. Scherpen, `Hankel Singular Value Functions from Schmidt Pairs for Nonlinear Input-Output Systems,' Proc. 2002 American Control Conference, Anchorage, Alaska, 2002, pp. 3540-3545.

    53. O. R. González, A. Tejada, and W. S. Gray, `Analysis of Design Tradeoffs in Rollback Recovery Methods for Fault Tolerant Digital Control Systems,' Proc. 2002 American Control Conference, Anchorage, Alaska, 2002, pp. 4801-4806.

    54. W. S. Gray and Y. Wang, `Fliess Operators on Lp Spaces: Convergence and Continuity,' Systems and Control Letters, vol. 46, no. 2, June 2002, pp. 67-74.

    55. W. S. Gray and Y. Li, `Interconnected Systems of Fliess Operators,' Proc. 2002 International Symposium on the Mathematical Theory of Networks and Systems, South Bend, Indiana, 2002.

    56. W. S. Gray, S. Patilkulkarni, and O. R. González, `Towards Hybrid Models of Recoverable Computer Control Systems,' Proc. 2002 Digital Avionics Systems Conference, Irvine, California, 2002, pp. 13.C.2-1-9.

    57. K. Fujimoto, J. M. A. Scherpen, and W. S. Gray, ``Hamiltonian Realizations of Nonlinear Adjoint Operators,' Automatica, vol. 38, no. 10, October 2002, pp. 1769-1775.

    58. J. M. A. Scherpen and W. S. Gray, `Nonlinear Hilbert Adjoints: Properties and Applications to Hankel Singular Value Analysis,' Nonlinear Analysis: Theory, Methods & Applications, vol. 51, no. 5, November 2002, pp. 883-901.

    59. O. R. González, W. S. Gray, and A. Tejada, `Analytical Tools for the Design and Verification of Safety Critical Control Systems,' 2001 SAE Transactions - Journal of Aerospace, vol. 110, Section 1, 2002, pp. 481-490.

    60. W. S. Gray and Y. Li, `Generating Series for Nonlinear Cascade and Feedback Systems,' Proc. 41st IEEE Conference on Decision and Control, Las Vegas, Nevada, 2002, pp. 2720-2725.

      2001


    61. W. S. Gray, `Computing Hilbert Adjoints of Fliess Operators,' Proc. 2001 Conference on Information Sciences and Systems, Baltimore, Maryland, 2001, pp. 481-486.

    62. W. S. Gray and J. M. A. Scherpen, `Nonlinear Hilbert Adjoints: Properties and Applications to Hankel Singular Value Analysis,' Proc. 2001 American Control Conference, Arlington, Virginia, 2001, pp. 3582-3587.

    63. E. I. Verriest and W. S. Gray, `Discrete-Time Nonlinear Balancing,' Preprints of the 5th IFAC Nonlinear Control Systems Design Symposium, Saint Petersburg, Russia, 2001, pp. 515-520.

    64. O. R. González, W. S. Gray, and A. Tejada, `Analytical Tools for the Design and Verification of Safety Critical Control Systems,' Proc. 2001 International Conference on Lightning and Static Electricity, Seattle, Washington, 2001 (invited).

    65. W. S. Gray and J. M. A. Scherpen, `On the Nonuniqueness of Singular Value Functions and Balanced Nonlinear Realizations,' Systems and Control Letters, vol. 44, no. 3, October 2001, pp. 219-232.

    66. O. R. González, W. S. Gray, A. Tejada, and S. Patilkulkarni, `Stability Analysis of Upset Recovery Methods for Electromagnetic Interference,' Proc. 2001 Digital Avionics Systems Conference, Daytona Beach, Florida, 2001, pp. 1.C.4-1-9.

    67. W. S. Gray, `Nonlinear Adjoints of Fliess Operators,' Proc. 40th IEEE Conference on Decision and Control, Orlando, Florida, 2001, pp. 2625-2630.

    68. O. R. González, W. S. Gray, A. Tejada, and S. Patilkulkarni, `Stability Analysis of Electromagnetic Interference Upset Recovery Methods,' Proc. 40th IEEE Conference on Decision and Control, Orlando, Florida, 2001, pp. 4134-4139.

    69. E. I. Verriest and W. S. Gray, `Nonlinear Balanced Realizations,' Proc. 40th IEEE Conference on Decision and Control, Orlando, Florida, 2001, pp. 3250-3251.

      2000


    70. W. S. Gray and Y. Wang, `Properties of Fliess Operators on Lp-Spaces,' Proc. 2000 Conference on Information Sciences and Systems, Princeton, New Jersey, 2000, pp. FP8-1-6.

    71. J. M. A. Scherpen, K. Fujimoto, and W. S. Gray, `On Adjoints and Singular Value Functions for Nonlinear Systems,' Proc. 2000 Conference on Information Sciences and Systems, Princeton, New Jersey, 2000, pp. FP8-7-12.

    72. K. Fujimoto, J. M. A. Scherpen, and W. S. Gray, `Hamiltonian Realizations of Nonlinear Adjoint Operators,' Lagrangian and Hamiltonian Methods for Nonlinear Control, (IFAC Workshop, Princeton, New Jersey), N. E. Leonard and R. Ortega, Eds., Amsterdam: Elsevier Science, 2000, pp. 39-44.

    73. J. M. A. Scherpen and W. S. Gray, `State Dependent Matrices and Balanced Energy Functions for Nonlinear Systems,' Proc. 2000 International Symposium on Mathematical Theory of Networks and Systems, Perpignan, France, 2000 (invited).

    74. E. I. Verriest and W. S. Gray, `Flow Balancing Nonlinear Systems,' Proc. 2000 International Symposium on Mathematical Theory of Networks and Systems, Perpignan, France, 2000 (invited).

    75. C. P. Britcher, O. R. González, W. S. Gray, O. Gomeiz, J. Barkley, and A. Jafri, `Design of a Magnetic Suspension and Balance System for the Princeton/ONR High Reynolds Number Testing Facility,' Proc. 5th International Symposium on Magnetic Suspension Technology, Santa Barbara, California, 2000, pp. 675-686.

    76. O. R. González, W. S. Gray, and S. Patilkulkarni, `Analysis of Memory Bit Errors Induced by Electromagnetic Interference in Closed-Loop Digital Flight Control Systems,' Proc. 2000 Digital Avionics Systems Conference, Philadelphia, Pennsylvania, 2000, pp. 3.C.5-1-9 (invited).

    77. W. S. Gray, O. R. González, and M. Dogan, `Stability Analysis of Digital Linear Flight Controllers Subject to Electromagnetic Disturbances,' IEEE Transactions on Aerospace and Electronic Systems, vol. 36, no. 4, October 2000, pp. 1204-1218.

    78. J. M. A. Scherpen and W. S. Gray, `Minimality and Local State Decompositions of a Nonlinear State Space Realization Using Energy Functions,' IEEE Transactions on Automatic Control, vol. 45, no. 11, November 2000, pp. 2079-2086.

    79. W. S. Gray, O. R. González, and S. Patilkulkarni, `Stability of Digital Control Systems Subject to Jump Linear Random Perturbations,' Proc. 39th IEEE Conference on Decision and Control, Sydney, Australia, 2000, pp. 1154-1159.

    80. W. S. Gray and Y. Wang, `Fliess Operators on Lp Spaces: Convergence and Continuity,' Proc. 39th IEEE Conference on Decision and Control, Sydney, Australia, 2000, pp. 4385-4390.

    81. J. M. A. Scherpen, K. Fujimoto, and W. S. Gray, `Hamiltonian Extensions, Hilbert Adjoints and Singular Value Functions for Nonlinear Systems,' Proc. 39th IEEE Conference on Decision and Control, Sydney, Australia, 2000, pp. 5102-5107.

    82. W. S. Gray and O. R. González, `Robust Stability and Performance of a Closed-Loop Computer Control System Subject to Electromagnetic Disturbances,' NASA Contractor Report NAS1-99093, NASA Langley Research Center, Hampton, Virginia, 2000.

      1999


    83. W. S. Gray and J. M. A. Scherpen, `On the Nonuniqueness of Singular Value Functions in Balanced Nonlinear Realizations,' Proc. 1999 Conference on Information Sciences and Systems, Baltimore, Maryland, 1999, pp. 729-734 (invited).

    84. W. S. Gray and B. Nabet, `Volterra Series Analysis and Synthesis of a Neural Network for Velocity Estimation,' IEEE Transactions on Systems, Man, and Cybernetics, vol. 29 (Part B), no. 2, April 1999, pp. 190-197.

    85. W. S. Gray, O. R. González, and M. Dogan, `Digital Linear State Feedback Control Subject to Electromagnetic Disturbances,' Proc. 1999 American Control Conference, San Diego, California, 1999, pp. 3500-3504.

    86. J. M. A. Scherpen and W. S. Gray, `On Singular Value Functions and Hankel Operators for Nonlinear Systems,' Proc. 1999 American Control Conference, San Diego, California, 1999, pp. 2360-2364.

    87. W. S. Gray, O. R. González, and M. Dogan, `Stochastic Perturbation Analysis of Computer Control Systems Subject to Electromagnetic Disturbances,' Proc. 1999 Conference on Control Applications, Kohala Coast-Island, Hawaii, 1999, pp. 1797-1802 (invited).

    88. W. S. Gray and E. I. Verriest, `Balancing Nonlinear Systems Near Attracting Invariant Manifolds,' Proc. 1999 European Control Conference, Karlsruhe, Germany, 1999.

    89. J. M. A. Scherpen and W. S. Gray, `Hankel Structure for Nonlinear Input-Output Systems and State-Space Realizations,' Proc. First Nonlinear Control Network Pedagogical School, Athens, Greece, 1999, pp. 331-363 (invited).

    90. W. S. Gray and J. Mesko, `Observability Functions for Linear and Nonlinear Systems,' Systems and Control Letters, vol. 38, no. 2, October 1999, pp. 99-113.

    91. W. S. Gray, O. R. González, and M. Dogan, `Stochastic Perturbation Models of Electromagnetic Disturbances in Closed-Loop Computer Controlled Flight Systems,' 1999 Digital Avionics Systems Conference, St. Louis, Missouri, 1999, pp. 10.C.4-1-8.

    92. W. S. Gray and J. M. A. Scherpen, `On the Nonuniqueness of Balanced Nonlinear Realizations,' Proc. 38th IEEE Conference on Decision and Control, Phoenix, Arizona, 1999, pp. 4736-4741.

    93. W. S. Gray and B. Nabet, `Modeling the Nonlinear Mapping in a Neural Based Motion Detector,' Proc. of the Second International Conference on Nonlinear Problems in Aviation and Aerospace, S. Sivasundaram, Ed., Cambridge: European Conference Publications, 1999, pp. 245-252 (invited).

    94. J. M. A. Scherpen and W. S. Gray, `On Singular Value Functions and Hankel Operators for Nonlinear Systems,' Book of Abstracts, 18th Benelux Meeting on Systems and Control, Houthalen-Helchteren, Belgium, 1999, p. 116.

      1998


    95. W. S. Gray and O. R. González, `Modeling Electromagnetic Disturbances in Closed-Loop Computer Controlled Flight Systems,' Proc. 1998 American Control Conference, Philadelphia, Pennsylvania, 1998, pp. 359-364 (invited).

    96. J. M. A. Scherpen and W. S. Gray, `Sufficient Conditions for Minimality of a Nonlinear Realization via Controllability and Observability Functions,' Proc. 1998 American Control Conference, Philadelphia, Pennsylvania, 1998, pp. 3349-3353.

    97. W. S. Gray and J. Mesko, `Energy Functions and Algebraic Gramians for Bilinear Systems,' Preprints of the 4th IFAC Nonlinear Control Systems Design Symposium, Enschede, The Netherlands, 1998, pp. 103-108.

    98. W. S. Gray and O. R. González, `EMI Models for Controller Analysis and Synthesis,' Proc. 1998 Digital Avionics Systems Conference, Seattle, Washington, 1998 (invited).

    99. W. S. Gray and J. M. A. Scherpen, `Hankel Operators and Gramians for Nonlinear Systems,' Proc. 37th IEEE Conference on Decision and Control, Tampa, Florida, 1998, pp. 1416-1421 (invited).

    100. E. I. Verriest and W. S. Gray, `Dynamics Near Limit Cycles: Model Reduction and Sensitivity,' Book of Abstracts, 1998 International Symposium on Mathematical Theory of Networks and Systems, Padova, Italy, 1998 (invited).

    101. J. M. A. Scherpen and W. S. Gray, `Sufficient Conditions for Minimality of a Nonlinear Realization via Controllability and Observability Functions,' Book of Abstracts, 17th Benelux Meeting on Systems and Control, Mierlo, The Netherlands, 1998, p. 117.

    102. W. S. Gray and O. R. González, `Stability Analysis and Augmentation of a Closed-Loop Computer Control System Subject to Electromagnetic Disturbances,' NASA Contractor Report NAS1-19858-108, NASA Langley Research Center, Hampton, Virginia, 1998.

      1997


    103. W. S. Gray and J. Mesko, `General Input Balancing Transformations for Nonlinear Systems,' Proc. 1997 Conference on Information Sciences and Systems, Baltimore, Maryland, 1997, pp. 264-269 (invited).

    104. Z. B. Hamsioglu and W. S. Gray, `Velocity Estimation via a Neural Network Enhanced by Classical Detection Algorithms,' Proc. 1997 Conference on Information Sciences and Systems, Baltimore, Maryland, 1997, pp. 896-901.

    105. D. J. Lane, W. S. Gray, and K. M. Murphy, `Linear H¥ Optimal Control of a Two Degree of Freedom Magnetic Suspension System,' Proc. 1997 American Control Conference, Albuquerque, New Mexico, 1997, pp. 1687-1691.

    106. W. S. Gray and J. Mesko, `General Input Balancing and Model Reduction for Linear and Nonlinear Systems,' Proc. 1997 European Control Conference, Brussels, Belgium, 1997.

    107. E. I. Verriest and W. S. Gray, `A Stochastic Approach to Control for Maximal Accuracy,' Proc. 36th IEEE Conference on Decision and Control, San Diego, California, 1997, pp. 1395-1396.

    108. J. M. A. Scherpen and W. S. Gray, `On Minimality and Similarity Invariance Issues for Nonlinear Systems,' Proc. of the Workshop: Mathematics for Systems, Saint Emilion, France, 1997, pp. 63-93.

      1996


    109. W. S. Gray and J. Mesko, `Controllability and Observability Functions for Model Reduction of Nonlinear Systems,' Proc. 1996 Conference on Information Sciences and Systems, Princeton, New Jersey, 1996, pp. 1244-1249 (invited).

    110. W. S. Gray and B. Nabet, `Volterra Series Analysis of a Neural Network for Velocity Estimation,' Proc. Computational Engineering in Systems Applications, 1996 IMACS Multiconference, Lille, France, 1996, pp. 926-931 (invited).

      1995


    111. E. I. Verriest and W. S. Gray, `A Geometric Approach to the Minimum Sensitivity Design Problem,' SIAM Journal on Control and Optimization, vol. 33, no. 3, May 1995, pp. 863-881.

    112. S. Bezick, I. Rusnak, and W. S. Gray, `Guidance of a Homing Missile Via Nonlinear Geometric Control Methods,' AIAA Journal of Guidance, Control, and Dynamics, vol. 18, no. 3, May-June 1995, pp. 441-448.

    113. D. J. Lane, R. McConnell, W. S. Gray, and K. M. Murphy, `Robust Linear Controller Design for a Two-Degree of Freedom Magnetic Suspension System,' Proc. 1995 Conference on Information Sciences and Systems, Baltimore, Maryland, 1995, pp. 273-278.

    114. S. Bezick, W. S. Gray, and I. Rusnak, `Application of Feedback Linearization to the Synthesis of Homing Guidance Laws,' Proc. 35th Israel Annual Conference on Aerospace Sciences, Tel Aviv, Israel, 1995, pp. 209-219.

    115. E. I. Verriest and W. S. Gray, `Optimal Control for Maximal Accuracy with Arbitrary Control Space Metric,' Proc. 34th IEEE Conference on Decision and Control, New Orleans, Louisiana, 1995, pp. 3914-3919.

    116. W. S. Gray and E. I. Verriest, `Minimum Sensitivity Design via Gradient Flows Techniques,' Proc. 34th IEEE Conference on Decision and Control, New Orleans, Louisiana, 1995, pp. 1091-1096 (invited).

      1994


    117. R. McConnell and W. S. Gray, `Sliding Mode Control of a Magnetic Suspension System Using Sampled-Data,' Proc. 1994 Conference on Information Sciences and Systems, Princeton, New Jersey, 1994, pp. 426-430.

    118. R. McConnell, D. J. Lane, and W. S. Gray, `Modeling and Performance Tradeoffs for Sliding Mode Control of a Magnetic Suspension System,' Proc. 1994 IEEE Regional NY/NJ Control Conference, Piscataway, New Jersey, 1994, pp. 141-144.

    119. D. J. Lane, R. McConnell, and W. S. Gray, `Force Modeling for the Control of a Two-Dimensional Magnetic Levitation System,' Proc. 1994 IEEE Regional NY/NJ Control Conference, Piscataway, New Jersey, 1994, pp. 149-152.

    120. E. I. Verriest and W. S. Gray, `A Geometric Approach to the Minimum Sensitivity Design Problem,' Proc. 33rd IEEE Conference on Decision and Control, Orlando, Florida, 1994, pp. 518-523 (invited).

      1993


    121. S. Bezick, I. Rusnak, and W. S. Gray, `Feedback Linearizing Control for the Guidance of a Homing Missile,' Proc. 1993 Conference on Information Sciences and Systems, Baltimore, Maryland, 1993, pp. 393-398.

    122. I. Rusnak, W. S. Gray, and A. Guez, `Generalizing the Certainty Equivalence Principle and Separation Theorems Beyond the Usual Heuristics,' in Proc. 1993 American Control Conference San Francisco, California, 1993, pp. 2965-2966.

    123. S. Bezick, I. Rusnak, and W. S. Gray, `Design of Guidance Law for Homing Missile via Feedback Linearization,' Proc. 1st IEEE Regional Conference on Aerospace Control Systems, Thousand Oaks, California, 1993, pp. 729-733.

    124. W. S. Gray and E. I. Verriest, `Parametric Sensitivity of Nonlinear State Space Realizations,' Book of Abstracts, 1993 International Symposium on Mathematical Theory of Networks and Systems, Regensburg, Germany, 1993, p. 134 (invited).

    125. W. S. Gray, `Neural Control of Magnetic Suspension Systems,' The 1993 NASA-ODU American Society for Engineering Education (ASEE) Summer Faculty Fellowship Program, Hampton, Virginia, 1993, pp. 102-103.

      1992


    126. S. Mercurio, I. Rusnak, W. S. Gray, and M. Kam, `Controlling a Magnetic Levitation System via Feedback Linearization,' Proc. 1992 Conference on Information Sciences and Systems, Princeton, New Jersey, 1992, pp. 1030-1035.

    127. S. D. Goodman and W. S. Gray, `A Theorem on Maximum Entropy Compression of Ergodic Sequences,' Proc. 1992 Conference on Information Sciences and Systems, Princeton, New Jersey, 1992, pp. 873-877.

    128. M. Kam, Q. Zhu, and W. S. Gray, `Optimal Data Fusion of Correlated Local Decisions in Multiple Sensor Detection Systems,' IEEE Transactions on Aerospace and Electronic Systems, vol. 28, no. 3, July 1992, pp. 916-920.

    129. W. S. Gray, `Functional Expansion Representations of Artificial Neural Networks,' The 1992 NASA-ODU American Society for Engineering Education (ASEE) Summer Faculty Fellowship Program, Hampton, Virginia, 1992, pp. 121-123.

      1991


    130. I. Radivojevic, J. Herath, and W. S. Gray, `High-Performance DSP Architectures for Intelligence and Control Applications,' IEEE Control Systems Magazine, vol. 11, no. 4, June 1991, pp. 49-55.

    131. R. L. Kimber and W. S. Gray, `The Effects of Sampling on Feedback Linearization: A Case Study,' Proc. 1991 American Control Conference, Boston, Massachusetts, 1991, pp. 1059-1060.

    132. M. Kam, Q. Zhu, and W. S. Gray, `On Distributed Detection with Correlated Local Detectors,' Proc. 1991 American Control Conference, Boston, Massachusetts, 1991, pp. 2174-2175.

    133. R. L. Kimber and W. S. Gray, `On Sampled-Data Implementations of Feedback Linearizing Controllers,' Proc. 30th IEEE Conference on Decision and Control, Brighton, England, 1991, pp. 1873-1874.

    134. W. S. Gray, `The Effects of Parameter Quantization on Realizations of Nonlinear Input-Output System,' Book of Abstracts, 1991 International Symposium on Mathematical Theory of Networks and Systems, Kobe, Japan, 1991, p. 160.

      1990


    135. W. S. Gray and E. I. Verriest, `The Parametric Sensitivity of Bilinear Dynamical Systems,' in Realization and Modelling in System Theory, (M. A. Kaashoek, J. H. van Schuppen and A. C. M. Ran, eds.), Boston: Birkhäuser Boston Inc., 1990, pp. 369-378.

    136. A. Meystel, J. Herath, and W. S. Gray, eds., Proceedings of the 5th IEEE International Symposium on Intelligent Control, Volumes I and II, IEEE Computer Society Press, 1990.

    137. S. D. Goodman, W. S. Gray, and M. A. Brook, `A Novel Neural Network for Temporal Pattern Identification with Applications to Control Systems,' Proc. 5th IEEE International Symposium on Intelligent Control, Philadelphia, Pennsylvania, 1990, pp. 473-478.

    138. W. S. Gray, E. I. Verriest, and F. L. Lewis, `A Hankel Matrix Approach to Singular System Realization Theory,' Proc. 29th IEEE Conference on Decision and Control, Honolulu, Hawaii, 1990, pp. 73-78.

      1989


    139. W. S. Gray, `A Geometric Approach to the Parametric Sensitivity of Dynamical Systems,' Ph.D. Thesis, Georgia Institute of Technology, Atlanta, Georgia 1989.

    140. W. S. Gray and E. I. Verriest, `On the Sensitivity of Generalized State-Space Systems,' Proc. 28th IEEE Conference on Decision and Control, Tampa, Florida, 1989, pp. 1337-1342.

      1988


    141. E. I. Verriest and W. S. Gray, `Robust Design Problems: A Geometric Approach,' in Linear Circuits, Systems and Signal Processing: Theory and Application, (C. I. Byrnes, C. F. Martin and R. E. Saeks, eds.), Amsterdam: Elsevier Science Publishers B. V., 1988, pp. 321-328.

      1987


    142. W. S. Gray and E. I. Verriest, `Optimality Properties of Balanced Realizations: Minimum Sensitivity,' Proc. 26th IEEE Conference on Decision and Control, Los Angeles, California, 1987, pp. 124-128.



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