Asok Ray

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

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    Article
    2008
    2 Citations (Scopus)

    Generalised projections in finite state automata and decidability of state determinacy

    Chattopadhyay, I. & Ray, A., Oct 1 2008, In : International Journal of Control. 81, 10, p. 1626-1644 19 p.

    Research output: Contribution to journalArticle

    Computability and decidability
    Discrete event simulation
    Finite automata
    Observability
    Telecommunication links
    61 Citations (Scopus)

    Space partitioning via Hilbert transform for symbolic time series analysis

    Subbu, A. & Ray, A., Mar 6 2008, In : Applied Physics Letters. 92, 8, 084107.

    Research output: Contribution to journalArticle

    time series analysis
    dynamical systems
    15 Citations (Scopus)

    Statistical pattern analysis of ultrasonic signals for fatigue damage detection in mechanical structures

    Gupta, S., Singh, D. S. & Ray, A., Oct 1 2008, In : NDT and E International. 41, 7, p. 491-500 10 p.

    Research output: Contribution to journalArticle

    Damage detection
    Fatigue damage
    ultrasonics
    Ultrasonics
    damage
    27 Citations (Scopus)

    Structural transformations of probabilistic finite state machines

    Chattopadhyay, I. & Ray, A., May 1 2008, In : International Journal of Control. 81, 5, p. 820-835 16 p.

    Research output: Contribution to journalArticle

    Finite automata
    Pattern recognition
    Nonlinear dynamical systems
    Chemical analysis
    2007

    Generalized language measure families of probabilistic finite state systems

    Chattopadhyay, I. & Ray, A., May 1 2007, In : International Journal of Control. 80, 5, p. 789-799 11 p.

    Research output: Contribution to journalArticle

    Formal languages
    Discrete event simulation
    Chemical analysis
    8 Citations (Scopus)

    Hierarchical control of aircraft propulsion systems: Discrete event supervisor approach

    Yasar, M. & Ray, A., Feb 1 2007, In : Control Engineering Practice. 15, 2, p. 149-162 14 p.

    Research output: Contribution to journalArticle

    Aircraft propulsion
    Hierarchical Control
    Discrete Event Systems
    Discrete Event
    Supervisory personnel
    27 Citations (Scopus)

    Language-measure-theoretic optimal control of probabilistic finite-state systems

    Chattopadhyay, I. & Ray, A., Aug 1 2007, In : International Journal of Control. 80, 8, p. 1271-1290 20 p.

    Research output: Contribution to journalArticle

    Formal languages
    Supervisory personnel
    Discrete event simulation
    Control theory
    6 Citations (Scopus)

    Modelling and system identification of an experimental apparatus for anomaly detection in mechanical systems

    Khatkhate, A. M., Ray, A. & Keller, E., Apr 1 2007, In : Applied Mathematical Modelling. 31, 4, p. 734-748 15 p.

    Research output: Contribution to journalArticle

    Anomaly Detection
    System Identification
    Mechanical Systems
    Identification (control systems)
    Durability
    29 Citations (Scopus)

    Online fatigue damage monitoring by ultrasonic measurements: A symbolic dynamics approach

    Gupta, S., Ray, A. & Keller, E., Jun 1 2007, In : International Journal of Fatigue. 29, 6, p. 1100-1114 15 p.

    Research output: Contribution to journalArticle

    Ultrasonic measurement
    Fatigue Damage
    Symbolic Dynamics
    Fatigue damage
    Monitoring
    30 Citations (Scopus)

    Pattern identification in dynamical systems via symbolic time series analysis

    Rajagopalan, V., Ray, A., Samsi, R. & Mayer, J., Nov 1 2007, In : Pattern Recognition. 40, 11, p. 2897-2907 11 p.

    Research output: Contribution to journalArticle

    Time series analysis
    Finite automata
    Time series
    Dynamical systems
    Automata theory
    15 Citations (Scopus)

    Pattern identification using lattice spin systems: A thermodynamic formalism

    Gupta, S. & Ray, A., Nov 19 2007, In : Applied Physics Letters. 91, 19, 194105.

    Research output: Contribution to journalArticle

    formalism
    thermodynamics
    dynamical systems
    anomalies
    deviation
    53 Citations (Scopus)

    Real-time fatigue life estimation in mechanical structures

    Gupta, S. & Ray, A., Jul 1 2007, In : Measurement Science and Technology. 18, 7, p. 1947-1957 11 p., 022.

    Research output: Contribution to journalArticle

    fatigue life
    Fatigue Life
    Fault
    Fatigue of materials
    Real-time
    78 Citations (Scopus)

    Symbolic time series analysis of ultrasonic data for early detection of fatigue damage

    Gupta, S., Ray, A. & Keller, E., Feb 1 2007, In : Mechanical Systems and Signal Processing. 21, 2, p. 866-884 19 p.

    Research output: Contribution to journalArticle

    Time series analysis
    Fatigue damage
    Ultrasonics
    Automata theory
    Ultrasonic sensors
    2006
    3 Citations (Scopus)

    A language measure for partially observed discrete event systems

    Chattopadhyay, I. & Ray, A., Sep 1 2006, In : International Journal of Control. 79, 9, p. 1074-1086 13 p.

    Research output: Contribution to journalArticle

    Discrete event simulation
    Formal languages
    Control systems
    Chemical analysis
    26 Citations (Scopus)

    Anomaly detection in aircraft gas turbine engines

    Tolani, D., Yasar, M., Ray, A. & Yang, V., Feb 1 2006, In : Journal of Aerospace Computing, Information and Communication. 3, 2, p. 44-51 8 p.

    Research output: Contribution to journalArticle

    Time series analysis
    Principal component analysis
    Propulsion
    Gas turbines
    Time series
    20 Citations (Scopus)
    Time series analysis
    Combustors
    Time series
    Dynamic models
    Friction
    7 Citations (Scopus)

    Correlation regimes in fluctuations of fatigue crack growth

    Scafetta, N., Ray, A. & West, B. J., Jan 1 2006, In : Physica A: Statistical Mechanics and its Applications. 359, 1-4, p. 1-23 23 p.

    Research output: Contribution to journalArticle

    Fatigue Crack Growth
    cracks
    Damage
    Fluctuations
    Time Scales
    6 Citations (Scopus)

    Identification of statistical patterns in complex systems via symbolic time series analysis

    Gupta, S., Khatkhate, A., Ray, A. & Keller, E., Jan 1 2006, In : ISA Transactions. 45, 4, p. 477-490 14 p.

    Research output: Contribution to journalArticle

    Automata theory
    Symbolic Analysis
    Electric power generation
    time series analysis
    Time series analysis
    4 Citations (Scopus)

    Integrated decision and control of human-engineered complex systems

    Tolani, D. K., Ray, A. & Horn, J. F., Jun 1 2006, In : International Journal of General Systems. 35, 3, p. 275-294 20 p.

    Research output: Contribution to journalArticle

    Large scale systems
    Complex Systems
    Discrete Event
    Damage
    Robust Control
    23 Citations (Scopus)

    Renormalized measure of regular languages

    Chattopadhyay, I. & Ray, A., Sep 1 2006, In : International Journal of Control. 79, 9, p. 1107-1117 11 p.

    Research output: Contribution to journalArticle

    Formal languages
    31 Citations (Scopus)

    Symbolic time-series analysis for anomaly detection in mechanical systems

    Khatkhate, A., Ray, A., Keller, E., Gupta, S. & Chin, S. C., Dec 1 2006, In : IEEE/ASME Transactions on Mechatronics. 11, 4, p. 439-446 8 p.

    Research output: Contribution to journalArticle

    Time series analysis
    Pattern recognition
    Automata theory
    Information theory
    Hidden Markov models
    12 Citations (Scopus)

    Symbolic time series analysis of ultrasonic signals for fatigue damage monitoring in polycrystalline alloys

    Gupta, S., Ray, A. & Keller, E., Jul 1 2006, In : Measurement Science and Technology. 17, 7, p. 1963-1973 11 p., 040.

    Research output: Contribution to journalArticle

    Symbolic Analysis
    time series analysis
    Fatigue Damage
    Time series analysis
    Time Series Analysis
    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
    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
    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
    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
    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
    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
    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
    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
    2004
    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
    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
    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
    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
    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
    305 Citations (Scopus)

    Symbolic dynamic analysis of complex systems for anomaly detection

    Ray, A., Jul 1 2004, In : Signal Processing. 84, 7, p. 1115-1130 16 p.

    Research output: Contribution to journalArticle

    Dynamic analysis
    Large scale systems
    Dynamical systems
    Finite automata
    Pattern recognition
    22 Citations (Scopus)

    Unconstrained optimal control of regular languages

    Fu, J., Ray, A. & Lagoa, C. M., Apr 1 2004, In : Automatica. 40, 4, p. 639-646 8 p.

    Research output: Contribution to journalArticle

    Formal languages
    Finite automata
    Linear equations
    Computational complexity
    Polynomials
    2003
    7 Citations (Scopus)

    A Language Measure for Supervisory Control

    Ray, A., Surana, A. & Phoha, S., Oct 2003, In : Applied Mathematics Letters. 16, 7, p. 985-991 7 p.

    Research output: Contribution to journalArticle

    Supervisory Control
    Formal languages
    Automata theory
    Regular Languages
    Supervisory personnel
    6 Citations (Scopus)

    Calibration and estimation of redundant signals for real-time monitoring and control

    Ray, A. & Phoha, S., Dec 1 2003, In : Signal Processing. 83, 12, p. 2593-2605 13 p.

    Research output: Contribution to journalArticle

    Calibration
    Monitoring
    Sensors
    Power plants
    Transport aircraft
    6 Citations (Scopus)

    Output feedback linear parameter varying (LPV) L2-gain control

    Hong, B. S., Ray, A. & Yang, V., Sep 1 2003, In : Journal of Dynamic Systems, Measurement and Control, Transactions of the ASME. 125, 3, p. 485-489 5 p.

    Research output: Contribution to journalArticle

    Gain control
    Feedback
    output
    Feedback control
    Experiments
    27 Citations (Scopus)

    Real-time health monitoring of mechanical structures

    Keller, E. & Ray, A., Jan 1 2003, In : Structural Health Monitoring. 2, 3, p. 191-203 13 p.

    Research output: Contribution to journalArticle

    Fatigue
    Health
    Ultrasonic sensors
    Monitoring
    Fatigue damage
    25 Citations (Scopus)

    Signed real measure of regular languages for discrete-event automata

    Ray, A. & Phoha, S., Dec 15 2003, In : International Journal of Control. 76, 18, p. 1800-1808 9 p.

    Research output: Contribution to journalArticle

    Formal languages
    Supervisory personnel
    Finite automata
    Control systems
    2002
    4 Citations (Scopus)

    Detection and identification of potential faults via multi-level hypotheses testing

    Ray, A. & Phoha, S., Jun 1 2002, In : Signal Processing. 82, 6, p. 853-859 7 p.

    Research output: Contribution to journalArticle

    Condition monitoring
    Testing
    Spacecraft
    Power plants
    Dynamical systems
    26 Citations (Scopus)

    Wide-range robust control of combustion instability

    Hong, B. S., Ray, A. & Yang, V., Jan 1 2002, In : Combustion and Flame. 128, 3, p. 242-258 17 p.

    Research output: Contribution to journalArticle

    trajectory control
    combustion stability
    Robust control
    Fuel injection
    fuel injection
    2001
    13 Citations (Scopus)

    Damage-mitigating control of aircraft for enhanced structural durability

    Caplin, J., Ray, A. & Joshi, S. M., Jul 1 2001, In : IEEE Transactions on Aerospace and Electronic Systems. 37, 3, p. 849-862 14 p.

    Research output: Contribution to journalArticle

    Durability
    Aircraft
    Flight dynamics
    Controllers
    Fatigue crack propagation