Asok Ray, Ph.D., P.E., Fellow IEEE, Fellow ASME, Fellow WIF

Distinguished Professor of Mechanical Engineering and Mathematics  
Graduate Faculty of Electrical Engineering 
The Pennsylvania State University,
329 Reber Building, University Park, PA 16802

Tel: (814) 865-6377;  Cell: (814) 206-4737;  FAX: (814) 863-4848; 
Email: axr2@psu.edu;   Web address: http://www.mne.psu.edu/Ray/


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Vita
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Publications
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Citations of Publications
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Research Laboratories
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Current Research
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Graduate Courses

Undergraduate Controls Laboratory
BIOGRAPHY
Asok Ray earned the Ph.D. degree in Mechanical Engineering from Northeastern University, Boston, MA in 1976, and also graduate degrees in each of the disciplines of Electrical Engineering, Mathematics, and Computer Science.   Dr. Ray joined the Pennsylvania State University in July 1985, and is currently a Distinguished Professor of Mechanical Engineering and Mathematics and a Graduate Faculty of Electrical Engineering.  Prior to joining Penn State, Dr. Ray held research and academic positions at Massachusetts Institute of Technology and Carnegie-Mellon University as well as management and research positions at GTE Strategic Systems Division, Charles Stark Draper Laboratory, and MITRE Corporation.   Dr. Ray is a naturalized citizen of USA since 1976.
Dr. Ray's original work has opened three new areas of multi-disciplinary science & technology that bear significant importance to the theory and practice of engineering disciplines in both defense and commercial sectors.

The first research area is Dr. Ray’s most recent contributions to the field of signal processing, control, and estimation is on anomaly detection via symbolic dynamic filtering and statistical pattern recognition. This research area has led to the development of a new technology for remote diagnosis and prognosis of air, water, and land platforms. From 2001 to 2007, Dr. Ray was the Principal Investigator of a Multidisciplinary University Research Initiative (MURI) grant. This MURI grant was awarded to Pennsylvania State University and collaborators (Duke, Carnegie Mellon, and Louisiana Tech) by the Army Research Office (ARO) in the area of Mathematics of Failures to conduct theoretical and experimental research on characterization and mitigation of anomalous behavior in complex dynamical systems. In addition, Dr. Ray was one of the grantees in the DARPA Information Exploitation Office (IXO) program on Command & Control - Mixed Initiative Control of Automa-Teams (MICA). These technologies have been transferred to industry through several SBIR and STTR projects for field applications in Department of Defense (DoD) sites (e.g., NAVAIR and NAVSEA) and NASA sites (e.g., NASA Glenn Research Center and NASA Marshall Space Flight Center). From June 2009 to December 2012, Dr. Ray was the Principal Investigator of a multidisciplinary multi-University research project in the field of Science of Autonomy funded by the Office of Naval Research (ONR), where the research activities focused on: (i) Autonomous Perception & Intelligent Decision-making, and (ii) Scalable & Robust Distributed Collaboration, based on the fundamental principles of Information Theory, Statistical Mechanics, and Automata Theory. Related to these research efforts, Dr. Ray had been one of the grantees in the PLUS-INP Program of the U.S. Navy that deals with actual undersea operations (e.g., mine countermeasure (MCM) and antisubmarine warfare (ASW)). Dr. Ray is also one of the three thrust leaders for a (2007-2014) Multidisciplinary University Research Initiative (MURI) grant from the Army Research Office to conduct theoretical and experimental research on dynamic modeling and control of sensor networks for information fusion with applications to urban warfare.

The second research area addresses the field of life extending control of dynamical systems for structural durability, pioneered by Dr. Ray in early 1990’s, which demonstrates the power of Information Science & Technology (IST)-based cross-disciplinary research in decision & control science, computer science, electromechanical science, thermal science, and material science. This research has addressed performance optimization, life extension, and self-healing control of aerospace structures and electromechanical systems by modeling the physics of material characteristics under dynamical environments perceived through a network of embedded sensors. Consequently, life extending control is considered essential for safe, reliable and economical operation of aging aircraft by NASA and Air Force, and of complex electromechanical systems like the Smart Ship by the Navy. NASA Glenn Research Center is implementing this concept of anomaly detection in gas turbine engines based on the principles of Symbolic Dynamics and Information Theory. Since 1987 Dr. Ray have been the principal investigator of several NASA research projects in Integrated Vehicle Health Management (IVHM) for safety enhancement of spacecraft and commercial aircraft.  

The third research area is Dr. Ray's earlier work (1987-1994) on Integrated Communication and Control (ICCS). The role of ICCS is to coordinate and perform inter-related functions ranging from real-time multi-loop control to information monitoring and decision support. In ICCS, a feedback control loop is closed via a common communication channel that multiplexes real-time information from sensor to controller and controller to actuator along with data traffic from other control loops and management functions. This research work is another contribution that has found wide acceptance in the international community. The U.S. Army has been pursuing this research area through several Multidisciplinary University Research Initiative (MURI) grants in the field of Sensor Networks. This research has addressed the issues of performance degradation and potential instability in the closed loop system, resulting from time-varying and possibly stochastic delays due to asynchronous time-division multiplexing in the network protocol. These innovative theoretical concepts were experimentally validated first in the laboratory environment and subsequently on various platforms including the MIT nuclear reactor, MITR-II. Following Dr. Ray's original work, Westinghouse Electric developed a signal validation software that is currently used in commercial nuclear reactors.
In addition to his contributions as an Engineer/Scientist, Dr. Ray has excelled as an educator and a mentor in his professional career of over thirty five years.   Dr. Ray has consistently worked to enhance the standard of interdisciplinary graduate education in Mechanical, Electrical, and Aerospace Engineering. Along this line Dr. Ray introduced several interdisciplinary graduate courses encompassung the fields of Applied Mathematics, Optimization & Control, Signal Processing & Pattern Recognition, Information Theory, and Chaos and nonliear Dynamics. Specifically, Dr. Ray has been a strong advocate for the role of modern mathematics and information sciences in engineering education. Dr. Ray, along with his colleagues, developed the Dynamical systems & Control Laboratory for experimental studies in several senior-level and graduate-level Mechanical Engineering courses in the fields of Modeling, Control, & Estimation, Signal Processing, and Robotics.

   At Penn State, Dr. Ray has supervised about twenty post-doctoral scholars, fifty doctoral dissertations and over a hundred master theses or projects.    His former students are currently holding or have held academic positions in U.S. and foreign universities, and research positions in organizations like Naval Research Laboratory, Argonne National Research Laboratory, Idaho National Research Laboratory, Oakridge National Research Laboratory, Boeing High Technology Center, General Electric Global Research Center, General Motors Research Laboratories, IBM Watson Research Center, and United Technology Research Center at USA and abroad.


RESEARCH AND SCHOLARSHIP AREAS 

 • Pattern Recognition, Anomaly & Fault Detection, and Symbolic Dynamics;
 • Optimal Control & Optimization, Robust Multivariable Control, and Hierarchical Control;
 • Modeling, Analysis and Control of Continuously-Varying & Discrete-Event Dynamical Systems;
 • Fault Diagnosis, Prognosis, and Mitigation in Complex Dynamical Systems
 • Stochastic Processes, Statistical Signal Processing, and Statistical Decision Theory;
 • Real-time Intelligent Decision & Control, and Instrumentation for Robotics & Automation;
 • Analysis and Modeling of Mechanical Behavior and Structural Damage in Engineering Materials;
 • Control Systems Analysis & Design for Aircraft & Spacecraft, and Undersea & Surface Ship; 
 • Control Systems Analysis and Design for Fossil & Nuclear Power Plants, and Processing Plants.

PUBLICATIONS RECORD 

Over five hundred research publications (including about two hundred and eighty scholarly articles in refereed journals and research monographs) and over forty technical reports based on sponsored research.

HONORS & AWARDS

        Professional Society Fellowship and Performance Awards
 • ASME Fellow Award for research in Decision & Control and Mechanics of Materials, 1994
 IEEE Fellow Award for research in aerospace and electromechanical systems, 2002
 • World Innovation Foundation (WIF) Fellow Award for innovative research in
        the art & science of fault diagnosis and failure prognosis in autonomous systems, 2005
 • ASME DSCD Henry M. Paynter Outstanding Investigator Award for fundamental contributions
        to statistical pattern recognition, life extending control of dynamical systems for structural
        durability, and integrated communication & control in the science of autonomy, 2012

        Government Agency Fellowship Awards
 • Senior Research Fellow Award, National Academy of Sciences, 1998 -1999

        Publication Awards
 • Kalman Best Paper Award, Journal of Dynamic Systems, Measurements, and Control,
        Transactions of ASME, 1999
 • Best Paper of Track Award, 19th AIAA/IEEE Digital Avionics Systems Conference (DASC),
        Philadelphia, PA, 2001
 • Most Cited Paper Award, Elsevier Journal -- Signal Processiong, 2004

        Academic Performance Awards
 • Outstanding Faculty Award, Penn State Mechanical Engineering Department, 1993
 Outstanding Research Award, Penn State College of Engineering, 1995
 • Premier Research Award, Penn State College of Engineering, 2003
 • Distinguished Professorship Award, Penn State, 2003

PROFESSIONAL ACTIVITIES

 • Professional Engineer (Electrical Engineer) registered in the Commonwealth of Massachusetts

 • Associate Editor, International Journal of Flexible Manufacturing Systems (1991-2009)
 • Associate Editor, ASME Journal of Dynamic Systems, Measurement, and Control (1992-1996)
 • Associate Editor, IEEE Transactions on Control Systems Technology (2001-2004)
 • Associate Editor, International Journal of Vehicle Autonomous Systems (2004-present)

 • Area Editor, Fault Tolerant Systems, IEEE Trans. Aerospace and Electronic Systems (2000-2005)

 • Editorial Board Member, Advances in Industrial Control, Springer-Verlag, London (2001-present)
 • Editorial Board Member, International Journal of Control, Taylor & Francis (2011-present)
 • Editorial Board Member, Control and Intelligent Systems, ACTA Press (2012-present)

INDUSRIAL RESEARCH & MANAGEMENT EXPERIENCE

        GTE Strategic Systems, Westborough, MA
Manager, Computer Network Systems Analysis & Design Department, February 1984 to June 1985
    This management position reported to the Director of the Systems Engineering Division within GTE Strategic Systems.  The major responsibility was to manage a department of eighteen technical personnel (two Ph.D., nine M.S., and 7 B.S.) with an annual budget of over three million dollars.  This department  provided analytical support to other departments within its own and other divisions.  The technical work involved conceptual design & analysis of wide area and local area computer communication network systems for the Department of Defense.  In particular, new network architectures were developed for a large worldwide data  communications network, and a test bed was established for verification, validation, and integration of protocols for both local and wide area networks.  The annual expenditure for internal research efforts in the department was about a million dollars.  In this research project, an expert system was formulated and coded, and was then validated on the test bed for distributed network management and control from a global perspective.

          The Charles Stark Draper Laboratory, Cambridge, MA
   (Concurrent Appointment with Massachusetts Institute of Technology)

Senior Research Scientist, January 1983 to February 1984
Researh Scientist, January 1980 to December 1982
    Major responsibilities were to identify new research areas, lead the efforts in the preparation of research proposals, and provide guidance to other researchers in the fields of control and diagnosis, signal processing, and communication networks.  Served as the Principal Investigator and a key technical contributor for several research projects in the following areas:
        - Failure diagnosis, guidance,  and control of aircraft and spacecraft
        - Development of a network architecture for highly maneuverable tactical arcraft;
        - Conceptual design of intelligent control systems for autonomous undersea vehicles;
        -
Intelligent discrete-event control of telecommunications and manufacturing processes

           The MITRE Corporation, Bedford, MA
Member of Technical Staff, July 1975  to August 1978
    Responsible for research and development in the following areas:
        - Analysis, synthesis, and implementation of aerospace communication and control systems;
        -
Analysis, synthesis, and implementation of guidance & control systems for unmanned vehicles;
   
    - Analysis and synthesis of  hierarchically structured control laws for distributed processes;
   
    - Simulation and performance analysis of local area networks

  Stone and Webster Engineering Corporation, Boston, MA
  Control Engineer and Graduate Research Fellow,  July 1972 to July 1975
   Conducted doctoral research in Systems Science under joint supervision of a university faculty and a senior scientist at Stone and Webster.  The research was concentrated in the concptual development of modeling, simulation, and control techniques for both continuously-varying and discrete-event dynamical systems with applications to electric power generation systems and chemical & processing plants.


ACADEMIC EXPERIENCE

   The Pennsylvania State University, University Park, PA
Distinguished Professor of Mechanical Engineering and Mathematics, January 2014 to present
Graduate Faculty of Electrical Engineering, September 1986 to present
Distinguished Professor of Mechanical Engineering, January 2003 to December 2013
Professor of Mechanical Engineering, July 1990 to December 2002
Associate Professor of Mechanical Engineering, July 1985 to June 1990
Member of Faculty in the Inter-College Graduate Program in Materials, Sept 1990 to June 2001
Chair, College Committee on Control Engineering Research & Curricula, Sept 1992 to present

   Massachusetts Institute of Technology, Cambridge, MA
(Concurrent Appointment with The Charles Stark Draper Laboratory)

Visiting Scientist, January 1980 to June 1985

   Northeastern University, Boston, MA
  Part-time Faculty in the Graduate School of Electrical Engineering, September 1980 to June 1985

   Carnegie-Mellon University, Pittsburgh, PA
  (Tenure-track) Assistant Professor of Mechanical Engineering, September 1978 to January 1980

   Development & Instruction of New Interdisciplinary Graduate Courses 

 • Foundations of Engineering Systems Analysis           (jointly listed ME/EE course at Penn State)
 • Nonlinear Control and Stability                                   (jointly listed ME/EE course at Penn State)
 • Robust Control Systems: Theory and Applications      (jointly listed ME/EE course at Penn State)
 • Stochastic Systems for Science and Engineering       (jointly listed ME/Math course at Penn State)
 • Wavelet Theory and Applications                               (jointly listed ME/Math course at Penn State)

 Thermodynamics, Information, & Chaotic Systems      (jointly listed ME/Physics course at Penn State)

 • Control of Discrete Event and Symbolic Systems        (jointly listed ME/IE course at Penn State)

 • Computer Networking for Process Control                    (EE course at Northeastern University)  
 • Abstract Algebra for Computer Engineering    
              (EE course at Northeastern University)


  Supervision of Doctoral Students/Dissertations at Penn State

         
      1989   Sueng Ho Hong    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
Performance Analysis of Token Bus Protocols for Integrated Control system Networks

      1989     Arun Ayyagari    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
A Fiber-Optic-based Protocol for Manufacturing System Networks

      1989      Rogelio Luck    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
Observability and Delay compensation of Integrated Communication and Control Systems

      1989       Nitin Nayak    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
An Integrated System for Intelligent Seam Tracking in Robotic Welding

      1990 Luen-Woei Liou    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
A Stochastic Regulator for Integrated Communication and Control Systems

      1990              Suk Lee    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
Real-Time Performance Management of Multiple-Access Computer Networks

      1991      Rong-Tarng Yu    Ph.D. in Electrical Engineering with Minor in Mechanical Engineering
            
A Twin-Bus-Controller Protocol for Fiber Optic Communication Networks

      1992 Jenny H. Shen    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
Robust Synthesis of Discrete-time Multivariable Control Systems with Induced Delays

      1993 Min-Kuang Wu    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
Damage Mitigating Control of Mechanical Systems

      1993 Humberto Garcia    Ph.D. in Electrical Engineering with Minor in Mechanical Engineering
            
A Reconfigurable Hybrid Supervisory Control System

      1994 Chen-Kuo Weng    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
Robust Wide-Range Control of Electric Power Plants

      1994 Xiaowen Dai    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
Damage Mitigating Control of the Space Shuttle Main Engine

      1995 Olaf Kaufman    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
Analysis and Synthesis of Robust Multiple-Input Multiple-Output Control Systems

      1995 James N. Rozak    Ph.D. in Mechanical Engineering and M.S. in Electrical Engineering
            
Impact of Robust Control on handling Qualities and Fatigue Damage of Rotorcraft

      1995 Nan-Chyuan Tsai    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
Stochastic Optimal Control under Randomly-varying Distributed Delays

      1995 Sekhar Tangirala    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
Stochastic Modeling of Fatigue damage for Monitoring, Prognostics and Life Extending Control

      1997 Michael S. Holmes    Ph.D. in Electrical Engineering with Minor in Mechanical Engineering
            
Damage Mitigating Control of Mechanical Systems

      1998 Pattada Kallappa    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
Robust Wide-Range control of Power Plants for Life Extension and Performance Enhancement

      1998 Jeffrey Caplin    Ph.D. in Mechanical Engineering and M.S. in Aerospace Engineering
            
Damage-Mitigating Control of Aircraft for High Performance and Life Extension

      1999 Ravindra Patankar    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
Modeling Fatigue Crack Growth for Life Extending Control

      1999 Hui Zhang    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
Intelligent decision and Control for Life Extension and high Performance

      1999 Bo-Shong Hong    Ph.D. in Mechanical Engineering with Minor in Electrical Engineering
            
Robust Control of Combustion Instabilities

      2001 Eric E. Keller    Ph.D. in Mechanical Engineering and M.S. in Aerospace Engineering
            
Real-Time Sensing of Fatigue Crack Damage for Information-Based Decision and Control

      2003 Jinbo Fu    Ph.D. in Mechanical Engineering and M.S. in Electrical Engineering
            
Robust Optimal Control of Regular Languages for Engineering Applications

      2003 Xi Wang    Ph.D. in Mechanical Engineering and M.S. in Electrical engineering
            
Quantitative Measure of Regular Languages for Supervisory Control of Engineering Applications

      2004 Shin Chin    Ph.D. in Electrical Engineering and M.S. in Physics
            
Real-time Anomaly Detection in Complex Dynamical systems

      2005 Devendra K. Tolani    Ph.D. in Mechanical Engineering and M.S. in Electrical Engineering
            
Integrated Health Management and Control of Complex Dynamical Systems

      2005 Jialing Chen    Ph.D. in Electrical Engineering and M.S. in Mechanical Engineering
            
Hybrid Control of Complex Dynamical Systems

      2006 Shalabh Gupta    Ph.D. in Mechanical Engineering and M.S. in Electrical Engineering
            
Behavioral Pattern Identification for Structural Health Monitoring in Complex Systems

      2006 Amol Khatkhate    Ph.D. in Mechanical Engineering and M.S. in Electrical Engineering
            
Anomaly Detection in Electromechanical Systems Using Symbolic Dynamics

      2006    Ishanu Chattopadhyay    Ph.D. in Mechanical Engineering and M.A. in Mathematics
            
Quantitative Control of Probabilistic Discrete Event Systems: A Measure-theoretic Approach

      2007 Rohan Samsi    Ph.D. in Electrical Engineering and M.S. in Mechanical Engineering
            
A Probabilistic Framework for Fault Detection in Induction Motors

      2007 Venkatesh Rajagopalan    Ph.D. in Electrical Engineering with minor in Mechanical Engineering
            
Symbolic Dynamic Filtering of Complex Dynamical Systems

      2009 Goutham Mallapragada    Ph.D. in Mechanical Engineering and M.S. in Electrical Engineering
            
A Language-theoretic Framework for Decision & Control of Autonomous Systems

      2009 Aparna Subbu    Ph.D. in Electrical Engineering and M.S. in Mechanical Engineering
            
Pattern Recognition Using Symbolic Dynamic Filtering

      2009 Abhishek Srivastav    Ph.D. in Mechanical Engineering and M.A. in Mathematics
            
Collaboration and Pattern Recognition in Distributed Sensor Networks

      2010 Subhadeep Chakraborty    Ph.D. in Mechanical Engineering and M.S. in Electrical Engineering
            
Symbolic Identification of Dynamical Systems: Theory and Experimental Validation

      2010 Chinmay R. Rao    Ph.D. in Electrical Engineering and M.S. in Mechanical Engineering
            
Data-driven Pattern Identification in Complex Systems Using Symbolic Dynamic Filtering

      2011 Soumik Sarkar    Ph.D. in Mechanical Engineering and M.A. in Mathematics
            
Autonomous Perception and Decision Making in Cyber-physical Systems

      2011 Kushal Mukherjee    Ph.D. in Mechanical Engineering and M.S. in Electrical Engineering
            
Supervisory Decision and Control of Large-scale Multi-agent Systems

      2011 Yicheng Wen    Ph.D. in Mechanical Engineering and M.A. in Mathematics
            
Heterogeneous Sensor Fusion in Sensor Networks: A Language-Theoretic Approach

      2011 Dheeraj S. Singh    Ph.D. in Mechanical Engineering and M.S. in Electrical Engineering
            
Real-Time Detection and Estimation of Incipient Damage in Polycrystalline Alloys

      2012 Xin Jin          Ph.D. in Mechanical Engineering and M.S. in Electrical Engineering
         
Situation Awareness and Adaptive Decision-making in Autonomous Systems via Symbolic Learning

SUPERVISION OF POSTDOCTORAL AND VISITING SCHOLARS

          1986-1987      A. Abo-Ismail          Fluid Power Control
          1986-1888      Y. Halevi                  Integrated Communication and Control Systems

          1991-1992       L-W. Liou               Optimal Control of Networked Dynamical Systems

          1992-1993      
J-H. Shen                Robust Optimal Control.                         
          1993-1994     
H.E. Garcia              Filtering and Estimation
          1994-1995      C-K. Weng              Robust Optimal Control
          2000-2001      H. Zhang                  Discrete Event Control Systems and Formal Languages
          2001-2002      S. Lee                      Discrete Event Control Systems and Formal Languages
          2001-present   E. Keller                  Complex Systems Failures
          2006-2011      S. Gupta                  Statistical Mechanics-inspired Pattern Classification
          2006-2011      I. Chattopadhyay     Formal-language-theoretic Control of Complex Systems
          Year 2010        A. Srivastav            Statistical Mechanics-inspired Decision & Control of Sensor Networks
          Year 2011        Bai Hua                   Decision & Control Algorithms for Mechanical Structures
          2011-2012     K. Mukherjee           Statistical Mechanics-Inspired Decision & Control of Sensor Networks