Leang-San Shieh received his B.S. degree from the National Taiwan University, Taiwan, in 1958, and the M.S. and Ph.D. degrees from the University of Houston, Houston, Texas, in 1968 and 1970, respectively, all in electrical engineering. He joined the Department of Electrical and Computer Engineering at the University of Houston in 1971 as an Assistant Professor and was promoted to Associate Professor in 1974, and Professor in 1978. Since 1988, he has been the Director of the Computer and System Engineering Program.

 
-• Research and Academics

Dr. Shieh is senior members of IEEE and AIAA, and a Registered Professional Engineer in the State of Texas. He was the recipient of more than ten College Outstanding Teacher Awards, the 1973 and 1997 College Teaching Excellence Awards (W. T. Kittinger Teaching Excellence Awards), the 1988 College Senior Faculty Research Excellence Award, and the 2003-2004 Fluor Daniel Faculty Excellence Award, the highest award given in the College, from the UH Cullen College of Engineering. In addition, he was the recipient of the 1976 University Teaching Excellence Award and the 2001-2002 El Paso Faculty Achievement Award from the University of Houston. Further, he received the Honor of Merit from Instituto Universitario Politecnico, Republic of Venezuela in 1978. His fields of interest are digital control, optimal control, self-tuning control and hybrid control of uncertain systems. He has directed 62 Master theses and 30 Ph.D. dissertations. He authored and co-authored more than two hundred and seventy  peer reviewed journal papers. He co-authored a research monograph, An Algebraic Approach to Structural Analysis and Design of Multivariable Control Systems (Springer, New York) in 1988.

 
-• Selected Publications

Ababneh, M., J.G. Barajas-Ramirez, G. Chen, and L.S. Shieh, “Robust Digital Controllers for Uncertain Chaotic Systems: Digital Redesign Approach,” Chaos, Solitons & Fractals, Vol. 31, 1149–1164, 2007.

Lu, Z., L.S. Shieh, G. Chen, and J. Chandra, “Identification and Control of Chaotic Systems via Recurrent High-Order Neural Networks,” AutoSoft- Intelligent Automation and Soft Computing, Vol. 13, No. 4, 365–380, 2007.

Zhou, H.Q., Q.G. Wang and L.S. Shieh, “PID Control of Unstable Processes with Time Delay: A Comparative Study,” Journal of Chemical Engineering of Japan, Vol. 40, No. 2, 145–163, 2007.

Canelon, J.I., R.S. Provence, L.S. Shieh, and C. R. Liu, “A Simple Recursive Method for Stationary Receiver Position Estimation Using GPS Difference Measurements,” ISA Transactions, Vol. 46, No. 2, 147–155, April 2007.

Tsai, J.S.H., T.H. Chin, S.M. Guo, Y.P. Chang, and L.S. Shieh, “State-Space Self-Tuning Control for Stochastic Fractional-Order Chaotic Systems,” IEEE Transaction on Circuits and Systems-I: Fundamental Theory and Applications, Vol. 54, No. 3, 632–642, March 2007.

J.S.H. Tsai, Y.Y. Lee, P. Cofie L.S. Shieh and X.M. Chen, “Active Fault Tolerant Control using State-Space Self-Tuning Control Approach”, International Journal of Systems Science, Vol. 37, No. 11, pp. 785-797, Sept. 2006.

Y.P. Zhang, C.M. Akujuobi, W.H. Ali, C. Tolliver and L.S. Shieh, “Load Distubance Resistance Speed Controller Design for PMSM”, IEEE Transactions on Industrial Electronics, Vol. 53, No. 4, pp. 1198-1208, Aug. 2006.

W.H. Ali, Y.P. Zhang, C.M. Akujuobi, C.L. Tolliver and L.S. Shieh, “DSP-Based PID Controller Design for the PMDC Motor”, International Journal of Modeling and Simulation, Vol. 26, No. 2, pp.143-150, 2006.

Z. Lu, L.S. Shieh, G. Chen and N.P. Coleman, “Adaptive Feedback Linearization Control of Chaotic Systems via Recurrent High-Order Neural Networks”, Information Sciences, Vol. 176, No. 16, pp. 2337-2354, 2006.

H.Q. Zhou, L.S. Shieh, C.R. Liu and Q.G. Wang, “State-Space PI controller Design for Linear Stochastic Multivariable Systems with Input Delay”, The Canadian Journal of Chemical Engineering, Vol. 84,  No. 2, pp.230-238, April 2006.

J.M. Madesen, L.S. Shieh and S.M. Guo, “State-Space Digital PID Controller Design for Multivariable Analog Systems with Multiple Time Delays,” Asian Journal of Control, Vol. 8, No. 2, pp. 161-173, 2006.

J. Canelon, H. Malki, S. Jacklin, and L.S. Shieh, “An Adaptive Neural Network Model for Vibration Control in Blackhawk Helicopter,” Journal of Helicopter, Vol. 50, No. 4, pp. 349–353, 2005.

J.S.H. Tsai, M.C. Wu, A.C. Dunn, and L.S. Shieh, “Digital Redesign Tracker for Cascaded Analog Systems with State Saturation and External Loads,” Journal of the Franklin Institute, Vol. 342, No. 7, pp. 852–876, November 2005.

J.S.H. Tsai, J.Y. Lin, A.C. Dunn, and L.S. Shieh, “Observer-based Tracker for Analog Systems with Saturating Actuators and State Constraints using Digital Redesign and a Weighted Switching Strategy,” Circuits, Systems, and Signal Processing, Vol. 24, No. 1, pp. 53–82, 2005.

J.S.H. Tsai, K.M. Chen, J.M. Madsen, L.S. Shieh, and S.M. Guo, “Evolutionary-programming-based Tracker for Hybrid Chaotic Interval Systems,” IMA Journal of Mathematical Control & Information, Vol. 22, No. 3, pp. 285–309, September 2005.

Y.Y. Lee, J.S.H. Tsai, L.S. Shieh, and G. Chen, “Equivalent Linear Observer-based Tracker for Stochastic Chaotic System with Delays and Disturbances,” IMA Journal of Mathematical Control & Information, Vol. 22, No. 3, pp. 266–284, September 2005.

J.I. Caneon, L.S. Shieh and N.B. Karayiannis, “A New Approach for Neural Control on Nonlinear Discrete Dynamic Systems,” International Journal of Information Sciences, Vol. 174, No. 3–4, pp. 177–196, August 2005.

J.I. Caneon, L.S. Shieh, S.M. Guo, and H.A. Malki, “Neural Network-based Digital Redesign Approach for Control of Unknown Continuous-time Chaotic Systems,” International Journal of Bifurcation and Chaos, Vol. 15, No. 8, pp. 2433–2455, August 2005.

J.S.H. Tsai, J.M. Yu, J.I. Canelon, and L.S. Shieh, “Extended-Kalman Filter-based Chaotic Communication,” IMA Journal of Mathematical Control & Information, Vol. 22, No. 1, pp. 58–79, March 2005.

J.S.H. Tsai, H. Chen, M.M. Moussighi, and L.S. Shieh, “Digital Redesign of Observer-based Weighting Switch Controller for Cascaded Analog Systems with State Saturation and External Loads,” ISA Transactions, Vol. 44, pp. 93–115, January 2005.

 Y.P. Zhang, L.S. Shieh, C.R. Liu and S.M. Guo, “Digital PID Controller Design for Multivariable Analog Systems with Computational Input–Delay”, IMA Journal of Mathematical Control & Information, Vol. 21, No. 4, pp. 433-456, December 2004.

Y.P. Zhang, L.S. Shieh, C.M. Akujuobi and W.H. Ali, “Digital PID Controller Design for Delayed Multivariable Systems”, Asian Journal of Control, Vol. 6, No. 4 pp. 483-495, December 2004.

Y.P. Zhang, L.S. Shieh and A.C. Dunn, “PID Controller Design for Disturbed Multivariable Systems”, IEE Proceedings, Control Theory and Applications, Vol. 151, No. 5, pp. 567-576, September 2004.

C.W. Chen, J.S.H. Tsai and L.S. Shieh, “Discretized Sub-optimal Tracker for Nonlinear Continuous Two-dimensional Systems”, Asian Journal of Control, Vol. 6, No. 3, pp. 317-340, September 2004.

J.G. Barajas-Ramirez, G. Chen and L.S. Shieh, “Fuzzy Chaos Synchronization via Sampled Driving Signals”, International Journal of Bifurcation and Chaos, Vol.14, No.8, pp. 2721-2733, August 2004.

H.P. Wang, J.S.H. Tsai, Y.I. Yi, and L.S. Shieh, “Lifted Digital Redesign of Prediction-Based Digital Controller for Hybrid Chaotic System”, International Journal of Bifurcation and Chaos , Vol.14, No.7, pp. 2295-2320, July 2004.

Z. Lu, L.S. Shieh, G. Chen and N.P. Coleman, “Simplex Sliding Mode Control for Nonlinear Uncertain Systems via Chao Optimization”, Chaos, Solitons & Fractals, Vol. 23, No. 3, pp.747-755, 2004.

Z. Lu, L.S. Shieh and J. Chandra, “Tracking Control of Nonlinear Systems: A Sliding Mode Design via Chaotic Optimization”, International Journal of Bifurcation and Chaos, Vol.14, No.4, pp.1343-1355, April 2004.

H.P. Wang, J.S.H. Tsai, Y.I. Yi and L.S. Shieh, “Lifted Digital Redesign of Observer-Based Tracker for Sample-Data System”, International Journal of Systems Science, Vol. 35, No. 4, pp. 255-271, April 2004.

A.C. Dunn, L.S. Shieh and S.M. Guo, “Digital Redesign of Analog Smith Predictor for Systems with Input Time-Delays”, ISA Transactions, Vol.43, no.1, pp.33-47, January 2004.

J.Y. Lin, J.S.H. Tsai, L.S. Shieh and S.M. Guo, “A New Conditioning Dual-Rate Observer-Based Tracker for Hybrid Chaotic Systems with Saturating Acturators”, International Journal of Systems Science, Vol. 35, No. 1, pp. 25-47, January 2004.

C.W. Chen, J.S.H. Tsai and L.S. Shieh, “Modeling and Solution of Two-Dimensional Input Time-Delay”, Journal of the Franklin Institute, Vol. 339, pp. 569-578, 2003.

J.S.H. Tsai, C.W. Chen, J.S. Li, J.I. Canelon and L.S. Shieh, “Discretized Optimal Tracker for Continuous Three-Dimensional Systems”, IMA Journal of Mathematical Control & Information, Vol. 20, pp. 451-486, 2003.

C.W. Chen, J.S.H. Tsai, and L.S. Shieh, “Modeling of Variable Coefficient Roesser Model for Systems Described by Second-Order Partial Differential Equation”, Circuits Systems Signal Process Vol.22, No.5, pp. 423-463, September/October, 2003.

C.M. Huang, J.S.H. Tsai, R.S. Provence and L.S. Shieh, “The Observer-Based Linear Quadratic Sub-Optimal Digital Tracker for Analog Systems with Input and State Delays”, Optimal Control Applications & Methods, Vol.24, No.4, pp. 197-236, July-August 2003.

J.G. Barajas-Ramirez, G. Chen and L.S. Shieh, “Hybrid Chaos Synchronizaiton”, International Journal of Bifurcation and Chaos, Vol. 13, No.5, pp.1197-1216, May 2003.

J.S. Li, J.S.H. Tsai and L.S. Shieh, “Digital Redesign of Continuous-Time Suboptimal Tracker for Two-Dimensional Systems”, Asian Journal of Control Vol.5, No.1, pp.78-87, March 2003.

M.C. Wu, J.S.H. Tsai, A.C. Dunn and L.S. Shieh, “Weighted Switching Lifted Digital Redesign with State Saturation for Cascaded Analog Systems”, IMA Journal of Mathematical Control & Information, Vol.20, No.1, pp65-87, March 2003.

Z. Lu, L.S. Shieh and G. Chen, “On Robust Control of Uncertain Chaotic Systems: a Sliding-Mode Synthesis via Chaotic Optimization”, Chaos, Solitons and Fractals, Vol.18, No. 4, pp. 821-829, 2003.

Y.S. Chen, J.S.H. Tsai, L.S. Shieh and M. Moussighi, “Digital Redesign of Anti-Wind-Up Controller for Cascaded Analog System”, ISA Transactions. Vol. 42, No. 1, pp.73-88, January 2003.

Y.S. Chen, J.S.H. Tsai, L.S. Shieh and F.C. Kung, “New Conditioning Dual-Rate Digital Redesign Scheme for Continuous-Time Systems with Saturating Actuators”, IEEE Trans. on Circuits and Systems – I: Fundametal Theory and Applications, Vol. 49, No. 12, pp. 1860-1870, December 2002.

Y.P. Chang, J.S.H. Tsai and L.S. Shieh, “Optimal Digital Redesign of Hybrid Cascaded Input-Delay Systems under State and Control Contraints”, IEEE Trans. on Circuits and Systems – I: Fundamental Theory and Applications, Vol. 49, No. 9, pp. 1382-1392, September 2002.

Z.Y. Fan, G. Chen, L.S. Shieh and C.F. Lin, “On a Hybrid Kalman Filtering Algorithm”, Journal of the Chinese Institute of Electrical Engineering Vol. 9, No. 3, pp. 191-200,August 2002.

J.S. Li, J.S.H.,Tsai and L.S. Shieh, “Discrete Linear Quadratic Tracker for Two Dimensional Systems”, Journal of the Chinese Institute of Electrical Engineering , Vol. 9, No. 3, pp. 243-250, August 2002.

Z. Weng, L.S. Shieh and G. Chen, “Kalman Filtering for Interval System using Evolutionary Programming”, Control Theory and Applications, Vol. 19, No. 2, pp. 193-196, April, 2002.

Y.P. Chang, J.S.H. Tsai and L.S. Shieh, “Optimal Tracking Design for Sampled-Data Systems with Input Time Delay Under State and Control Constraints”, International Journal of JSME, Series C, Vol. 45 No. 1, pp. 226-238, March 2002   

Y.P. Chang, J.S.H. Tsai and L.S. Shieh, “Digital Redesign of Uncertain Systems with State and Input Delays Using Evolutionary Programming”, International Journal of General Systems, Vol. 31, No. 3, pp 225-244, 2002.

J.S.H. Tsai, J.S. Li and L.S. Shieh, “Discretized Quadratic Optimal Control for Continuous-Time Two-Dimensional Systems”, IEEE Trans. on Circuits and System (I) Vol. 49, No. 1, pp. 116-125, January 2002.

L.S. Shieh, W.M. Wang, and J.W. Sunkel, "Design of PAM and PWM controllers for sampled-data interval systems,'' Transactions of ASME, Journal of Dynamic Systems, Measurement and Control, v 118, 673-682, December 1996.

L.S. Shieh, Y.T. Wang, and J.W. Sunkel, "Hybrid state-space self-tuning control of uncertain linear systems,'' Proceedings of IEE, Part D., Control Theory and Applications, v 140, no 2, 99-110, March 1993.

C.F. Chen, and L.S. Shieh, "A novel approach to linear model simplification,'' International Journal of Control, v 8, no 6, 561-570, 1968.