Scholarly Publications




Ph.D. Dissertation


Problems in the Control of Flexible Spacecraft, Aug. 1989, Supervisor:
Prof. Dr. Charles A.Desoer
University of California, Berkeley
California, USA.


Books



• Stability and Stabilization of Infinite Dimensional Systems with Applications, Springer Verlag, 1999.
  Zheng Hua Luo, Bao Zhu Guo, Omer Morgul.
  

  Articles in Refereed Journals

  
  
• ``Further stability results for a generalization of delayed feedback control," Nonlinear Dynamics, 1 August 2012, pp. 1-8, doi:10.1007/s11071-012-0530-z.
  O. Morgul.
  
• ``Boundary Control of a Rotating Shear Beam with Observer Feedback," Journal of Vibration and Control 1077546311429145, first published on December 16, 2011 as doi:10.1177/1077546311429145.
  M. Dogan, O. Morgul.
  
• `` Approximate Analytic Solutions to Non-Symmetric Stance Trajectories of the Passive Spring-Loaded Inverted Pendulum with Damping," Nonlinear Dynamics, vol. 62, no. 4, pp. 729-742, Dec. 2010.
  U; Saranli, O. Arslan, M. M. Ankarali, O. Morgul.
  
• ``On The Control of Two-Link Flexible Robot Arm with Nonuniform Cross Section," Journal of Vibration and Control, vol. 16, no. 5, pp. 619-646, 2010.
  M. Dogan, O. Morgul.
  
• ``A New Generalization of Delayed Feedback Control," International Journal of Bifurcation and Chaos , vol. 19, no. 1, pp. 365-377, 2009.
  O. Morgul.
  
• "On the stabilization of periodic orbits for discrete time chaotic systems by using scalar feedback," International Journal of Bifurcation and Chaos , vol. 17, no. 12, pp. 4431-4442, 2007.
  O. Morgul.
  
• "Stabilization of unstable periodic orbits for discrete time chaotic systems by using periodic feedback," International Journal of Bifurcation and Chaos. vol. 16, no. 2, pp. 311-323, 2006.
  O. Morgul.
  
• "On the stability of delayed feedback controllers for discrete time systems," Physics Letters A, vol. 335, pp. 31-42, 2005.
  O. Morgul.
  
• "On the stabilization of periodic orbits for discrete time chaotic systems," Physics Letters A, vol. 335, pp. 127-138, 2005.
  O. Morgul.
  
• "A model based scheme for anticontrol of some discrete time chaotic systems," International Journal of Bifurcation and Chaos, vol. 14, no. 6, pp. 2943-2954, 2004.
  O. Morgul.
  
• "A model based scheme for anticontrol of some chaotic systems," International Journal of Bifurcation and Chaos, vol. 13, no. 11, pp. 3449-3457, 2003.
  O. Morgul.
  
• "On the stability of delayed feedback controllers ," Physics Letters A, vol. 314, pp. 278-285, 2003.
  O. Morgul.
  
• "Observer based chaotic message transmission," International Journal of Bifurcation and Chaos, vol. 13, no. 4, pp. 1003-1017, 2003.
  O. Morgul, E. Solak, M. Akgul.
  
• "A switching synchronization scheme for a class of chaotic systems," Physics Letters A, vol. 301, pp. 241-249, 2002.
  O. Morgul, M. Akgul.
  
• "An exponential stability result for the wave equation," Automatica, vol.38, pp. 731-735, 2001.
  O. Morgul.
  
• "Stabilization and disturbance rejection for the beam equation," IEEE Trans. on Automatic Control, vol. 46, no. 12, pp. 913-918, 2001.
  O. Morgul.
  
• Comments on the paper "An unstable plant with no poles," IEEE Trans. on Automatic Control, vol. 46, no. 11, pp. 1843-1843, 2001.
  O. Morgul.
  
• "Observer based control of a class of chaotic systems," Physics Letters A, vol. 279, pp. 47-55, 2001.
  E. Solak, O. Morgul, U. Ersoy.
  
• "Quadratic Optimality of Zero-Phase repetitive control," ASME Journal on Dynamic Systems, Measurement and Control, vol 123, pp. 554-555, 2001.
  H. Koroglu, O. Morgul.
  
• "Time-varying repetitive control for better transient response and stochastic behaviour," Electronics Letters, vol. 37, no. 17, pp. 1101-1102, 2001.
  H. Koroglu, O. Morgul.
  
• "Synchronization and chaotic masking scheme based on occasional coupling," Physical Review E, vol. 62, no. 3, pp. 3543-3551, 2000.
  O. Morgul.
  
• "An RC realization of Chua's circuit family," IEEE Tran. on Circuits and Systems, part 1, vol. 47, no. 9, pp. 1424-1430, 2000.
  O. Morgul.
  
• "An Analysis of Maximum Clique Formulations and Saturated Linear Dynamical Network," ARI, vol. 51, pp. 268-276, 1999.
  N.S. Sengor, Y. Cakir, C. Guzelis, F. Pekergin, and O. Morgul.
  
• "On the control of some chaotic systems by using dither," Physics Letters, vol. 262, no. 10, pp. 144-151, 1999.
  O. Morgul.
  
• "A chaotic masking scheme by using synchronized chaotic systems," Physics Letters A, 251, pp. 169-176, Jan. 1999.
  O. Morgul, M. Feki.
  
• "Necessary condition for observer based chaos synchronization," Physical Review Letters, Vol. 82, No. 1, pp. 77-80, Jan. 1999.
  O. Morgul.
  
• "On the control of chaotic systems in Lur'e form by using dither," IEEE Trans. on Circuits and Systems, part 1, vol. 46, no. 10, pp. 1301-1305, 1999.
  O. Morgul.
  
• "A saturated linear dynamical network for approximating maximum clique," IEEE Trans. on Circuits and Systems, part 1, vol. 46, no. 6, pp. 677-685, 1999.
  F. Pekergin, O. Morgul, C. Guzelis.
  
• "On the synchronization of logistic maps," Physics Letters A, vol. 247, pp. 391-396, 1998.
  O. Morgul.
  
• "Solving maximum clique problem by cellular neural network," Electronics Letters, vol. 34, no. 15, pp. 1504-1506, 1998.
  N.S. Sengor, M.E. Yalcin, Y. Cakir, M. Ucer, C. Guzelis, F. Pekergin, O. Morgul.
  
• "On the stabilization of flexible beam with a tip mass," Siam J. on Control and Optimization, vol. 36, no. 6, pp. 1962-1986, 1998.
  F. Conrad, O. Morgul.
  
• "Stabilization and disturbance rejection for the wave equation," IEEE Transactions on Automatic Control, vol. 43, no. 1, pp.89-95, 1998,
  O. Morgul.
  
• "Synchronization of chaotic systems by using occasional coupling," Physical Review E, vol 55, No. 5, pp. 5004-5010, May 1997.
  O. Morgul, M. Feki.
  
• "On the synchronization of chaotic systems by using state observers," Int. Journal of Bifurcation and chaos, vol. 7, no. 6, pp. 1307-1322, 1997.
  O. Morgul, E. Solak.
  
• "On the observer based synchronization of chaotic systems," Physical Review E, vol. 54, no. 5, pp. 4803-4811, 1996.
  O. Morgul, E. Solak.
  
• "Wien bridge based RC chaos generator," Electronics Letters, vol. 31, no. 24, Nov. 1995, pp. 2058-2059.
  O. Morgul.
  
• "On the stabilization and stability robustness against small delays of some damped wave equations," IEEE Transactions on Automatic Control, vol. 40, no. 9, Sept. 1995, pp. 1626-1630.
  O. Morgul.
  
• "Inductorless realisation of Chua oscillator," Electronics Letters, vol. 31, no. 27, Aug. 1995, pp. 1403-1404.
  O. Morgul.
  
• "A dynamic control law for the wave equation," Automatica, vol. 30, no. 11, Nov. 1994, pp. 1785-1792.
  O. Morgul.
  
• "On the stabilization of a cable with a tip mass," IEEE Transactions on Automatic Control, vol. 39, no. 10, Oct. 1994, pp. 2140-2145.
  O. Morgul, B. P. Rao, F. Conrad.
  
• "Control and stabilization of a rotating flexible structure," Automatica, vol. 30, no. 2, Feb. 1994, pp. 351-356.
  O. Morgul.
  
• "On the design of dynamic associative neural memories," IEEE Transactions on Neural Networks, vol. 5, no. 3, May 1994, pp. 489-492.
  M. E. Savran, O. Morgul.
  
• "Dynamic boundary control of the Timoshenko beam," Automatica, vol. 28, No. 6, Oct. 1992, pp. 1255-1260.
  O. Morgul.
  
• "Dynamic boundary control of a Euler-Bernoulli beam," IEEE Transactions on Automatic Control, Vol. 37, No. 5, May 1992, pp. 639-642.
  O. Morgul.
  
• "Boundary control of a Timoshenko beam attached to a rigid body : planar motion," International Journal of Control, vol. 54, no. 4, Oct. 1991, pp. 763-791.
  O. Morgul.
  
• "Orientation and stabilization of a flexible beam attached to a rigid body : planar motion," IEEE Transactions on Automatic Control, vol. 36, No. 8, Aug. 1991, pp. 953-962.
  O. Morgul.
  
• "Control and stabilization of a flexible beam attached to a rigid body," International Journal of Control, Vol. 51, No. 1, pp. 11-31, Jan. 1990.
  O. Morgul.
  

Book Reviews



• "Chaos in Circuits and Systems," G. Chen, and T. Ueta , Singapore, World Scientific Publishing Co., 650 p., Automatica, vol. 41, pp. 352-355, 2005.
  O. Morgul.
  

Other Publications



• On the stabilization of a flexible beam with a tip mass, Les prepublications de l'Institut Elie Cartan, No. 19, 1996.
  F. Conrad, O. Morgul.
  
• Problems in the control of flexible spacecraft, Technical Memorandum, UCB/ERL M89/97, Electronic Research Laboratory, University of California, 1989.
  O. Morgul.
  
• Control and stabilization of a flexible beam attached to a rigid body, Technical Memorandum, UCB/ERL M89/5, Electronic Research Laboratory, University of California, 1989.
  O. Morgul.
  

Conference Publications



• ``A 3D Dynamic Model of a Spherical Wheeled Self Balancing Robot," Proceedings of IEEE.RSJ Int. Conf. on Inteeligent Robots and Systems, IROS 2012.
  A. N. Inal, U. Saranli, O. Morgul.
  
• ``A Nonlinear Control Scheme for Discrete Time Chaotic Systems," Proceedings of 3rd IFAC Conference on Analysis and Control of Chaotic Systems (CHAOS11), Cancun, Mexico, 20-22 June, 2012.
  O. Morgul.
  
• ``On the Strain Feedback Control of a Flexible Robot Arm,". Proceedings of the 2011 American Control Conference, pp. 1795-1800, San Francisco, USA. June. 2011.
  O. Morgul.
  
• ``Adaptive Control of a Spring-Mass Hopper," Proceedings of 2011 IEEE International Conference on Robotics and Automation}, pp. 2138-2143, Shanghai, China, May 2011.
  I. Uyanik, U. Saranli, O. Morgul.
  
• ``A New Periodic Controller for Discrete Time Chaotic Systems,". Proceedings of the 8th IFAC Symposium on Nonlinear Systems, pp. 191-196, Bologna, Italy. Sept. 2010.
  O. Morgul.
  
• ``Reactive Footstep Planning for a Planar Spring Mass Hopper,". Proceedings of the 2009 Int. Conf. on Intelligent Robots and Systems, St. Louis, MO, USA. October 2009 .
  O. Arslan, U. Saranli, O. Morgul.
  
• ``A New Delayed Feedback Control Scheme for Discrete Time Chaotic Systems," Proceedings of 2nd IFAC Conference on Analysis and Control of Chaotic Systems (CHAOS09), University of London, United Kingdom, 22-24 June, 2009.
  O. Morgul.
  
• ``PDE Control of a Rotating Shear Beam with Boundary Feedback," Proceedings of European Control Conference, (ECC’09), pp. 856-861, Budapest, Hungary, 2009.
  M. Dogan, O. Morgul.
  
• ``An Approximate Stance Map of the Spring Mass Hopper with Gravity Correction for Nonsymmetric Locomotions,". Proceedings of the 2009 Int. Conf. On Robotics and Automation, pp. 2388-2393, Kobe, Japan. May 2009.
  O. Arslan, U. Saranli, O. Morgul.
  
• ``On the Boundary Control of Kirchhoff's Nonlinear String," Proceedings of NOLCOS 2007, Pretoria, South Africa, Aug. 22 - Aug. 24, 2007.
  O. Morgul, S. M. Shahruz.
  
• ``Boundary Control Schemes for Nonlinear Kirchhoff String," Proceedings of SIAM Conf. on Control and Its Applications, San Fransisco, USA, June 29 - July 1, 2007.
  O. Morgul, S. M. Shahruz.
  
• "Nonlinear PDE control of two link flexible arm with nonuniform cross section," proceedings of the 2006 ACC, Min., USA, June 14-16, 2006, pp. 400-406.
  M. Dogan, O. Morgul.
  
• "Boundary control of some infinite dimensional systems," proceedings of the 16th IFAC World Congress, July 3-8, Prague, Czech Rep., 2005.
  O. Morgul.
  
• "Stability results for some periodic feedback controllers," proceedings of the 16th IFAC World Congress, July 3-8, Prague, Czech Rep., 2005.
  O. Morgul.
  
• "On the boundary control of passive infinite dimensional systems," proceedings of the 11th Mediterranean Conference on Control and Automation, p. 27, 18-20 June 2003, Rhodes, Greece.
  O. Morgul.
  
• "Model Based Anticontrol of Chaos, Proceedings of International conference Physics and Control 2003, pp. 440-445, 20-22 Aug. 2003, St. Petersburg, Russia.
  O. Morgul.
  
• "Stability of delayed feedback controllers for discrete time systems," Proceedings of International conference Physics and Control 2003, pp. 491-496, 20-22 Aug. 2003, St. Petersburg, Russia .
  O. Morgul.
  
• "A stability result for delayed feedback controllers ," Proceedings of IEEE Conference Decision and Control 2003, Dec. 9-12, 2003, Hawaii, USA.
  O. Morgul.
  
• "Model based anticontrol of discrete time systems ," Proceedings of IEEE Conference Decision and Control 2003, Dec. 9-12, 2003, Hawaii, USA.
  O. Morgul.
  
• "On the boundary control of beam equation," proceedings of IFAC 2002 World Congress, pp. 2017-2023, 21-26 July 2002, Barcelona, Spain.
  O. Morgul.
  
• "On the synchronization and control of a class of chaotic systems, Proceedings of NDES 2002, pp. 3.13-3.17, 21-23 June 2002, Izmir, Turkey.
  O. Morgul, M. Akgul.
  
• "On the boundary control of a flexible robot arm," Proc. of 40th IEEE Conference on Decision and Control, pp. 3856-3858, Orlando, Florida, Dec. 4-7, 2001.
  O. Morgul.
  
• "Stabilization and disturbance rejection for the beam equation," Proc. of 40th IEEE Conference on Decision and Control, pp. 3858-3860, Orlando, Florida, Dec. 4-7, 2001.
  O. Morgul.
  
• "Robust LQ control for harmonic reference/disturbance signals," Proc. of 39th CDC, Sydney, Australia, Dec. 2000.
  H. Koroglu, O. Morgul.
  
• "Theoretical and experimental results for the control of some chaotic systems by using dither," Proc. of ECCTD, Stresa, Italy, pp. 863-867, Sept. 1999.
  O. Morgul.
  
• "Discrete-time LQ optimal repetitive control," Proc. ACC, San Diego, California, June 1999.
  H. Koroglu, O. Morgul.
  
• "LQ optimal design at finitely many frequencies," Proc. of 37th Conf. on Decision and Control, Tampa, Florida, Dec. 1998, pp. 1195-1196.
  H. Koroglu, O. Morgul.
  
• "A gain selection scheme for high gain nonlinear observers," Proc. of Nonlinear Control Systems Design Symp., Enschede, The Netherlands, July 1998, pp. 757-760.
  E. Solak, O. Morgul
  
• "Gradient-like systems as continuous methods for approximating maximum clique," Proc. of Turkish Symp. on Artificial Intelligence and Neural Networks, Bilkent, Ankara, June 1998, pp. 234-243.
  N.S. Sengor, M.E. Yalcin, Y. Cakir, M. Ucer, C. Guzelis, F. Pekergin, O. Morgul.
  
• "On the dynamic boundary control of a flexible structure," Proc. of ICOTA'98, June 1998, Vol. 1, pp. 337-345, Perth, Australia.
  O. Morgul.
  
• "An application of cellular neural network : maximum clique problem," 1998 5th IEEE Int. Workshop on Cellular Neural Networks and their applications, London, 14-17 April, 1998, pp. 208-211.
  N.S. Sengor, M.E. Yalcin, Y. Cakir, M. Ucer, C. Guzelis, F. Pekergin, O. Morgul.
  
• "On the application of dither for controlling some chaotic systems," Proc. of ECCTD 97, Aug. 1997, vol. 3, pp. 1216-1221, Budapest, Hungary.
  O. Morgul, U. Ersoy.
  
• "Observer based control of chaos," Proc. of COC'97, St. Petersburg, Russia, Aug. 1997, pp. 594-597.
  E. Solak, O. Morgul, U. Ersoy.
  
• "Fuzzy controller design for parametric controllers," Proc. of 12th IEEE Conference on Intelligent Control, July 1997, Istanbul, Turkey, pp. 67-72.
  M. Akgul, O. Morgul.
  
• "Fuzzy controller design for parametric controllers: rule generation with fuzzy c-means clustering," Proc. of TAINN 1997, Ankara, Turkey, May 1997, pp. 63-67.
  M. Akgul, O. Morgul
  
• "A communication scheme by using synchronized chaotic systems," Proc. 3rd IEEE Int. Conf. on Electronics, Circuits and Syst., Rhodes, Greece, 1996, pp. 1060-1063.
  O. Morgul, M. Feki.
  
• "Parameter optimized controller design based on frequency domain identification," presented in MTNS'96, St. Louis, USA, 1996.
  H. Koroglu, O. Morgul.
  
• "On the boundary control of single link flexible robot arms," Proc. of IFAC'96, San Fransisco, USA, 1996, pp. 127-133.
  O. Morgul.
  
• "On the stabilization of a beam with a tip mass," Proceedings of Third European Control Conference, ECC'95, Rome, Italy, Sept. 1995, pp. 1518-1521.
  O. Morgul, B. P. Rao, F. Conrad.
  
• "Dynamic boundary control of a flexible robot arm," Proceedings of Third European Control Conference, ECC'95, Rome, Italy, Sept. 1995, pp. 1522-1527.
  O. Morgul.
  
• "Robust stabilization of the wave equation against small delays," Proceedings of 33rd Conference on Decision and Control, CDC, Orlando, Florida, USA, Dec. 1994, pp. 1751-1756.
  O. Morgul.
  
• "Stabilization and disturbance rejection for the wave equation," Proceedings of 33rd Conference on Decision and Control, CDC, Orlando, Florida, USA, Dec. 1994, pp. 1776-1777.
  O. Morgul.
  
• "Uniform stabilization of a string with a tip mass," IFIP Conf. on Numerical Analysis and Optimization, Rabat, Dec. 1993.
  F. Conrad, O. Morgul, B. P. Rao.
  
• "Constant angular velocity control of a rotating flexible structure," Proceedings of Second European Control Conference ECC'93 Groningen, Netherlands, June 1993, pp. 299-302.
  O. Morgul.
  
• "Orientation and stabilization of a rotating flexible structure," Proceedings of Conference on Mathematical Theory of Networks and Systems, MTNS'93, Regensburg, Germany, Aug. 1993, vol. 2, pp. 809-811, published by Akademie Verlag, series Mathematica l Research, vol. 79, ed. U. Helmke, R. Mennicken, J. Sauer, Berlin, 1994.
  O. Morgul.
  
• "Application of Gauss-Seidel iteration to RLS algorithm," in Linear Algebra for Large Scale and Real-Time Applications, M. S. Moonen, G. H. Golub and B. L. R. DeMoor, ed.s, NATO ASI Series, Series E : Applied Science, Vol. 232, Kluwer Academic Publishers, 1993, pp. 407-409.
  O. Morgul, A. Malas.
  
• "Dynamic boundary control and disturbance rejection in boundary control systems," Proceedings of the 31st IEEE Conference on Decision and Control, CDC, Tucson, Arizona, USA, Dec. 1992, pp. 1305-1310.
  O. Morgul, S. M. Shahruz.
  
• "Dynamic boundary control of a rotating flexible structure," Proceedings of the 31st IEEE Conference on Decision and Control, CDC, Tucson, Arizona, USA, Dec. 1992, pp. 1313-1314.
  O. Morgul.
  
• "On the stabilization of the wave equation," in Analysis and Optimization of Systems : State and Frequency Domain Approaches for Infinite Dimensional Systems, R. F. Curtain, ed., Lecture Notes in Control and Information Sciences, Vol. 185, Springer-Verlag, 1993, pp. 531-543.
  O. Morgul.
  
• "On the associative memory design for the Hopfield neural network", Proceedings of IEEE IJCNN'91, International Joint Conference on Neural Networks, vol. 2, Nov. 1991, Singapore, pp. 1166-1171.
  M. E. Savran, O. Morgul.
  
• "On the design of Hopfield and cellular neural networks", Proceedings of ISCIS 6, the 6th International Symphosium on Computer and Information Sciences, 11 vol. 2, Nov. 1991, Elsevier. Antalya, Turkiye, 1991, pp. 899-905.
  M. E. Savran, O. Morgul.
  
• "Dynamic boundary control of a rotating flexible spacecraft," Proceedings of International Symposium MTNS-91, vol. 2, Kobe, Japan, June 1991, pp. 591-595.
  O. Morgul.
  
• "Orientation and control of a flexible spacecraft : planar motion," Proceedings of the 29th IEEE Conference on Decision and Control, vol. 2, Honolulu, Hawaii, Dec. 1990, pp. 393-394.
  O. Morgul.
  
• "On the boundary control of a flexible robot arm," Proceedings of the IEEE International Workshop on Intelligent Motion Control, vol. 2, Istanbul, Turkiye, Aug. 1990, pp. 519-522.
  O. Morgul.
  
• "A dynamic boundary control of a flexible beam," Proceedings of the 1990 Bilkent Conference on New Trends in Communication, Control and Signal Processing (ed. Erdal Arkan), vol. 2, Elsevier Science Publishers, Ankara, Turkiye, July 1990, pp. 925-931.
  O. Morgul.
  
• "Disturbance rejection in boundary control systems," Proceedings of the American Control Conference, Pittsburgh, PA, USA, 1989, pp. 1623-1624.
  S. M. Shahruz, O. Morgul.
  
• "Control and stabilization of a flexible beam attached to a rigid body : planar motion," Proceedings of the 27th IEEE Conference on Decision and Control, Austin, Texas, Dec. 1988, pp. 1643-1644,.
  C. A. Desoer, O. Morgul.
  
• "Some disturbance decoupling results in linear m-ports," Proceedings of the 5th International Symposium on Network Theory, Sarajevo, Yugoslavia, Sept. 1984. pp. 112-117.
  O. Morgul, I. Cem Goknar.
  
• "Some transfer function realization results in m-ports," Proceedings of the 5th International Symposium on Network Theory, Sarajevo, Yugoslavia, Sept. 1984, pp. 118-123.
  O. Morgul, I. Cem Goknar.
  

e-mail address : morgul@ee.bilkent.edu.tr