Asok Ray

    • 6887 Citations
    • 36 h-Index
    1976 …2019
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    Research Output 1976 2019

    2006
    190 Citations (Scopus)

    Symbolic time series analysis via wavelet-based partitioning

    Rajagopalan, V. & Ray, A., Nov 1 2006, In : Signal Processing. 86, 11, p. 3309-3320 12 p.

    Research output: Contribution to journalArticle

    Time series analysis
    Damage detection
    Large scale systems
    Time series
    5 Citations (Scopus)

    Wavelet-based symbolic analysis for detection of broken rotor bars in inverter-fed induction motors

    Samsi, R., Rajagopalan, V. & Ray, A., Dec 1 2006, Proceedings of the 2006 American Control Conference. Vol. 2006. p. 3032-3037 6 p. 1657182

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Induction motors
    Wavelet transforms
    Rotors
    1 Citation (Scopus)

    Wavelet space partitioning for symbolic time series analysis

    Rajagopalan, V. & Ray, A., Jul 1 2006, In : Chinese Physics Letters. 23, 7, p. 1951-1954 4 p., 081.

    Research output: Contribution to journalArticle

    time series analysis
    dynamical systems
    anomalies
    2005
    2 Citations (Scopus)

    A complex measure for linear grammars

    Chattopadhyay, I. & Ray, A., Jul 1 2005, In : Demonstratio Mathematica. 38, 3, p. 761-775 15 p.

    Research output: Contribution to journalArticle

    Grammar
    Regular Languages
    Supervisory Control
    Context-free Grammar
    Signed

    Advanced topics in supervisory control

    Chattopadhyay, I. & Ray, A., Dec 1 2005, Quantitative Measure for Discrete Event Supervisory Control. Springer New York, p. 95-130 36 p.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Formal languages
    Context free grammars
    High level languages
    Finite automata
    Petri nets
    13 Citations (Scopus)

    Anomaly detection for health management of aircraft gas turbine engines

    Tolani, D., Yasar, M., Chin, S. & Ray, A., 2005, In : Proceedings of the American Control Conference. 1, p. 459-464 6 p., WeA15.1.

    Research output: Contribution to journalArticle

    Pattern recognition
    Gas turbines
    Time series
    Turbines
    Aircraft
    3 Citations (Scopus)

    Discrete event supervisory control of a mobile robotic system

    Wang, X., Lee, P., Ray, A. & Phoha, S., Dec 1 2005, Quantitative Measure for Discrete Event Supervisory Control. Springer New York, p. 133-156 24 p.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Robotics
    Signal analysis
    Control theory
    Computer vision
    Artificial intelligence
    4 Citations (Scopus)

    Early detection of voltage imbalances in three-phase induction motors

    Samsi, R., Rajagopalan, V., Mayer, J. & Ray, A., Sep 1 2005, In : Proceedings of the American Control Conference. 1, p. 478-483 6 p., WeA15.4.

    Research output: Contribution to journalConference article

    Induction motors
    Time series analysis
    Monitoring
    Electric potential
    Wavelet transforms

    Embedded Soft Sensing for Anomaly Detection in Mobile Robotic Networks

    Phoha, V. V., Phoha, S., Ray, A., Balagani, K. S., Nadgar, A. U. & Varanasi, R., Oct 7 2005, Sensor Network Operations. John Wiley and Sons, p. 609-629 21 p.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Robotics
    8 Citations (Scopus)

    Hierarchical control of rotorcraft for enhanced performance and structural durability

    Tolani, D. K., Horn, J. F., Yasar, M. & Ray, A., Dec 1 2005, Collection of Technical Papers - AIAA Guidance, Navigation, and Control Conference 2005. p. 4706-4717 12 p. (Collection of Technical Papers - AIAA Guidance, Navigation, and Control Conference; vol. 6).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Durability
    Robust control
    Supervisory personnel
    Helicopters
    Switches
    3 Citations (Scopus)

    Incipient fault detection in mechanical power transmission systems

    Bhatnagar, S., Rajagopalan, V. & Ray, A., Sep 1 2005, In : Proceedings of the American Control Conference. 1, p. 472-477 6 p., WeA15.3.

    Research output: Contribution to journalConference article

    Automata theory
    Helical gears
    Time series analysis
    Information theory
    Power transmission

    Intelligent navigation in space under supervisory control

    Chattopadhyay, I., Chakraborty, S. & Ray, A., Dec 1 2005, Collection of Technical Papers - InfoTech at Aerospace: Advancing Contemporary Aerospace Technologies and Their Integration. Vol. 1. p. 376-386 11 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Navigation
    Supervisory personnel
    Collision avoidance
    Dynamic models
    Robotics
    1 Citation (Scopus)

    Language-measure-based supervisory control of a mobile robot

    Wang, X., Mallapragada, G. & Ray, A., Sep 1 2005, In : Proceedings of the American Control Conference. 7, p. 4897-4902 6 p., FrC11.1.

    Research output: Contribution to journalConference article

    Mobile robots
    Robotics
    Visual servoing
    Motion control
    Robots
    7 Citations (Scopus)

    Model-following control of a military helicopter with damage mitigation

    Bridges, D. O., Horn, J. F. & Ray, A., Dec 1 2005, Collection of Technical Papers - AIAA Guidance, Navigation, and Control Conference 2005. p. 4680-4694 15 p. (Collection of Technical Papers - AIAA Guidance, Navigation, and Control Conference; vol. 6).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Military helicopters
    Controllers
    Rotors
    Vehicle transmissions
    Aircraft
    1 Citation (Scopus)

    Online detection of fatigue failure via symbolic time series analysis

    Gupta, S., Ray, A. & Keller, E., 2005, In : Proceedings of the American Control Conference. 5, p. 3309-3314 6 p., ThC15.2.

    Research output: Contribution to journalArticle

    Automata theory
    Ultrasonic sensors
    Time series analysis
    Fatigue damage
    Fatigue crack propagation
    7 Citations (Scopus)

    On-line identification of language measure parameters for discrete-event supervisory control

    Wang, X., Ray, A. & Khatkhate, A. M., Jun 2005, In : Applied Mathematical Modelling. 29, 6, p. 597-613 17 p.

    Research output: Contribution to journalArticle

    Supervisory Control
    Discrete Event
    Finite automata
    Finite State Automata
    Formal languages

    On the design of discrete-time fixed-order controllers for persistent disturbance rejection

    Chen, J., Lagoa, C. M. & Ray, A., Dec 1 2005, Proceedings of the 16th IFAC World Congress, IFAC 2005. p. 360-365 6 p. (IFAC Proceedings Volumes (IFAC-PapersOnline); vol. 16).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Disturbance rejection
    Controllers
    Transfer functions

    Optimal control of robot behavior using language measure

    Wang, X., Ray, A., Lee, P. & Fu, J., Dec 1 2005, Quantitative Measure for Discrete Event Supervisory Control. Springer New York, p. 157-181 25 p.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Robots
    Supervisory personnel
    Finite automata
    Formal languages
    Costs

    Optimal discrete event control of gas turbine engines

    Yasar, M., Fu, J. & Ray, A., Dec 1 2005, Quantitative Measure for Discrete Event Supervisory Control. Springer New York, p. 183-205 23 p.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Gas turbines
    Turbines
    Formal languages
    Supervisory personnel
    Computer systems
    1 Citation (Scopus)

    Optimal supervisory control of aircraft propulsion: A discrete event approach

    Yasar, M., Tolani, D. & Ray, A., 2005, In : Proceedings of the American Control Conference. 3, p. 1503-1508 6 p., WeC11.2.

    Research output: Contribution to journalArticle

    Aircraft propulsion
    Engines
    Controllers
    Supervisory personnel
    Condition monitoring

    Optimal supervisory control of regular languages

    Ray, A., Fu, J. & Lagoa, C., Dec 1 2005, Quantitative Measure for Discrete Event Supervisory Control. Springer New York, p. 39-69 31 p.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Formal languages
    Finite automata
    Computational complexity
    Dynamical systems
    Polynomials

    Preface

    Ray, A., Phoha, V. V. & Phoha, S., Dec 1 2005, Quantitative Measure for Discrete Event Supervisory Control. Springer New York

    Research output: Chapter in Book/Report/Conference proceedingForeword/postscript

    10 Citations (Scopus)

    Probabilistic robust control of rotorcraft

    Horn, J. F., Tolani, D. K., Lagoa, C. M., Wang, Q. & Ray, A., Jul 1 2005, In : Control Engineering Practice. 13, 8, p. 1037-1046 10 p.

    Research output: Contribution to journalArticle

    Robust control
    Robust Control
    Control System
    Control systems
    Controller
    19 Citations (Scopus)

    Quantitative measure for discrete event supervisory control

    Ray, A., Phoha, V. V. & Phoha, S., Dec 1 2005, Springer New York. 264 p.

    Research output: Book/ReportBook

    Large scale systems
    Control theory
    Students
    Management science
    Electric power generation

    Robust optimal control of regular languages

    Lagoa, C., Fu, J. & Ray, A., Dec 1 2005, Quantitative Measure for Discrete Event Supervisory Control. Springer New York, p. 71-93 23 p.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Formal languages
    Finite automata
    Costs
    Computational complexity
    Polynomials
    2 Citations (Scopus)

    Robust optimal control of regular languages

    Lagoa, C. M., Fu, J. & Ray, A., Aug 1 2005, In : Automatica. 41, 8, p. 1439-1445 7 p.

    Research output: Contribution to journalArticle

    Formal languages
    Finite automata
    Costs
    Computational complexity
    Polynomials

    Signed real measure of regular languages

    Ray, A. & Wang, X., Dec 1 2005, Quantitative Measure for Discrete Event Supervisory Control. Springer New York, p. 3-37 35 p.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Formal languages
    Supervisory personnel
    Finite automata
    Automata theory
    Computational complexity
    49 Citations (Scopus)

    Signed real measure of regular languages for discrete event supervisory control

    Ray, A., Aug 15 2005, In : International Journal of Control. 78, 12, p. 949-967 19 p.

    Research output: Contribution to journalReview article

    Formal languages
    Supervisory personnel
    Finite automata
    Automata theory
    Computational complexity

    Supervisory control of malicious executables in software processes

    Xu, X., Phoha, V. V., Ray, A. & Phoha, S., Dec 1 2005, Quantitative Measure for Discrete Event Supervisory Control. Springer New York, p. 239-259 21 p.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Discrete event simulation
    Finite automata
    Control theory
    Experiments
    1 Citation (Scopus)

    Supervisory control of software systems

    Phoha, V., Nadgar, A., Ray, A. & Phoha, S., Dec 1 2005, Quantitative Measure for Discrete Event Supervisory Control. Springer New York, p. 207-238 32 p.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Supervisory personnel
    Finite automata
    Control theory
    Application programs
    Specifications
    53 Citations (Scopus)

    Symbolic time series analysis for anomaly detection: A comparative evaluation

    Chin, S. C., Ray, A. & Rajagopalan, V., Sep 1 2005, In : Signal Processing. 85, 9, p. 1859-1868 10 p.

    Research output: Contribution to journalArticle

    Time series analysis
    Pattern recognition
    Dynamical systems
    Automata theory
    Time series
    10 Citations (Scopus)

    Wavelet-based space partitioning for symbolic time series analysis

    Rajagopalan, V. & Ray, A., 2005, Proceedings of the 44th IEEE Conference on Decision and Control, and the European Control Conference, CDC-ECC '05. Vol. 2005. p. 5245-5250 6 p. 1582995

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Phase space methods
    Maximum entropy methods
    Time series analysis
    Large scale systems
    Time series
    2004
    3 Citations (Scopus)

    A complex measure of non-regular languages for discrete-event supervisory control

    Chattopadhyay, I., Ray, A. & Wang, X., 2004, Proceedings of the 2004 American Control Conference (AAC). Vol. 6. p. 5120-5125 6 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Formal languages
    Context free grammars
    Finite automata
    Control systems
    Chemical analysis
    2 Citations (Scopus)

    A language measure for partially observed discrete event supervisory control systems

    Chattopadhyay, I. & Ray, A., Dec 1 2004, In : Proceedings of the IEEE Conference on Decision and Control. 1, p. 45-50 6 p., TuA02.2.

    Research output: Contribution to journalConference article

    Supervisory Control
    Discrete Event
    Control System
    Control systems
    Formal languages
    46 Citations (Scopus)

    A language measure for performance evaluation of discrete-event supervisory control systems

    Wang, X. & Ray, A., Sep 1 2004, In : Applied Mathematical Modelling. 28, 9, p. 817-833 17 p.

    Research output: Contribution to journalArticle

    Supervisory Control
    Formal languages
    Discrete Event
    Finite automata
    Performance Evaluation
    1 Citation (Scopus)

    A symbolic dynamics approach for early detection of slowly evolving faults in nonlinear systems

    Rajagopalan, V., Samsi, R., Ray, A., Mayer, J. & Lagoa, C. M., Dec 1 2004, Proceedings of the IASTED International Conference on Circuits, Signals, and Systems. Rashid, M. H. (ed.). p. 213-218 6 p. 449-082. (Proceedings of the IASTED International Conference on Circuits, Signals, and Systems).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Nonlinear dynamical systems
    Finite automata
    Phase behavior
    Nonlinear systems
    Time series
    6 Citations (Scopus)

    Detection of fatigue crack anomaly: A symbolic dynamics approach

    Khatkhate, A., Ray, A., Chin, S., Rajagopalan, V. & Keller, E., Nov 29 2004, Proceedings of the 2004 American Control Conference (AAC). p. 3741-3746 6 p. (Proceedings of the American Control Conference; vol. 4).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Crack detection
    Vibrators
    Finite automata
    Pattern recognition
    Time series

    Development of methodology for early detection of BWR instabilities

    Petruzzi, A., Chin, S., Ivanov, K., Ray, A. & Cheung, F. B., Dec 1 2004, In : Transactions of the American Nuclear Society. 91, p. 902-905 4 p.

    Research output: Contribution to journalConference article

    4 Citations (Scopus)

    Hierarchical control of future generation rotorcraft

    Tolani, D. K., Horn, J. F., Ray, A. & Chen, J., Nov 29 2004, In : Proceedings of the American Control Conference. 2, p. 1707-1712 6 p.

    Research output: Contribution to journalConference article

    Automata theory
    Controllers
    Robust control
    Helicopters
    Experiments
    1 Citation (Scopus)

    Hierarchical discrete event supervisory control of aircraft propulsion systems

    Yasar, M., Tolani, D., Ray, A., Shah, N. & Litt, J. S., Dec 1 2004, Collection of Technical Papers - AIAA 1st Intelligent Systems Technical Conference. p. 920-932 13 p. AIAA-2004-6469. (Collection of Technical Papers - AIAA 1st Intelligent Systems Technical Conference; vol. 2).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Aircraft propulsion
    Engines
    Propulsion
    Controllers
    Supervisory personnel
    19 Citations (Scopus)

    Measure of regular languages

    Surana, A. & Ray, A., Apr 1 2004, In : Demonstratio Mathematica. 37, 2, p. 485-503 19 p.

    Research output: Contribution to journalArticle

    Regular Languages
    Total ordering
    Finite State Automata
    Quantitative Evaluation
    Partially Ordered Set
    9 Citations (Scopus)

    Optimal control of robot behaviour using language measure

    Wang, X., Ray, A., Lee, P. & Fu, J., Dec 1 2004, In : International Journal of Vehicle Autonomous Systems. 2, 3-4, p. 147-167 21 p.

    Research output: Contribution to journalArticle

    Robots
    Formal languages
    Finite automata
    Computational complexity
    Robotics
    7 Citations (Scopus)

    Optimal discrete event supervisory control of aircraft gas turbine engines

    Fu, J., Yasar, M. & Ray, A., 2004, Proceedings of the 2004 American Control Conference (AAC). Vol. 6. p. 5710-5715 6 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Gas turbines
    Turbines
    Aircraft
    Formal languages
    Computer systems
    24 Citations (Scopus)

    Optimal supervisory control of finite state automata

    Ray, A., Fu, J. & Lagoa, C., Aug 15 2004, In : International Journal of Control. 77, 12, p. 1083-1100 18 p.

    Research output: Contribution to journalArticle

    Finite automata
    Computational complexity
    Dynamical systems
    Polynomials
    Costs

    Optimal supervisory control of regular languages

    Ray, A., Fu, J. & Lagoa, C. M., Oct 1 2004, In : Demonstratio Mathematica. 37, 4, p. 991-1013 23 p.

    Research output: Contribution to journalArticle

    Supervisory Control
    Regular Languages
    Finite State Automata
    Optimal Control
    Optimal Policy
    6 Citations (Scopus)

    Probabilistic fault diagnosis in discrete event systems

    Wang, X., Chattopadhyay, I. & Ray, A., Dec 1 2004, In : Proceedings of the IEEE Conference on Decision and Control. 5, p. 4794-4799 6 p., FrB06.5.

    Research output: Contribution to journalConference article

    Probabilistic Reasoning
    Finite State Automata
    Decision System
    Discrete Event Systems
    Discrete Event
    2 Citations (Scopus)

    Robot behavioral selection using discrete event language measure

    Wang, X., Fu, J., Lee, P. & Ray, A., 2004, In : Proceedings of the American Control Conference. 6, p. 5126-5131 6 p.

    Research output: Contribution to journalArticle

    Finite automata
    Robotics
    Robots
    Reinforcement learning
    Polynomials
    1 Citation (Scopus)

    Signal calibration, estimation for real-time monitoring and control

    Ray, A. & Phoha, S., Jan 1 2004, Distributed Sensor Networks. CRC Press, p. 391-407 17 p.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Health
    Calibration
    Steam power plants
    Transport aircraft
    Feedforward control
    14 Citations (Scopus)

    Stochastic measure of fatigue crack damage for health monitoring of ductile alloy structures

    Ray, A., Jan 1 2004, In : Structural Health Monitoring. 3, 3, p. 245-263 19 p.

    Research output: Contribution to journalArticle

    Fatigue
    Health
    Monitoring
    Hilbert spaces
    Stochastic models
    19 Citations (Scopus)

    Supervisory control of software systems

    Phoha, V. V., Nadgar, A. U., Ray, A. & Phoha, S., Sep 1 2004, In : IEEE Transactions on Computers. 53, 9, p. 1187-1199 13 p.

    Research output: Contribution to journalArticle

    Supervisory Control
    Software System
    Supervisory personnel
    Finite State Automata
    Control Theory