Parameter estimation and system identification, adaptive signal processing and control, control systems.
Dr. Williamson's research interests span the disciplines of signal processing and control systems. His work emphasizes system identification and parameter estimation, including adaptive filtering, with application in signal processing, control, and biomedical settings. His current research projects involve modeling vascular dynamics in the kidney to help in understanding the progression of kidney disease, developing methodologies for the automated recognition of animal vocalizations, and analyzing the dynamics of control of power electronic systems. He also maintains interest in the development and analysis of algorithms and model structures for effective system identification and adaptive filtering, using both linear and nonlinear model structures.
Dr. Williamson has previously served as the Associate Dean for Academic Affairs in IIT's Graduate College and as the Graduate Program Director for the Department of Electrical and Computer Engineering. He was an Associate Editor in digital signal processing for the IEEE Transactions on Circuits and Systems Part II. He is a Senior Member of the Institute of Electrical and Electronics Engineers, and he is a member of Eta Kappa Nu and Tau Beta Pi.
Myril B. Reed Best Paper Award, 2002 Midwest Symposium on Circuits and Systems (with Daniel A. Bailey).
Graduate College Fellow, Illinois Institute of Technology, 1999-2000.
Graduate College Fellow, Illinois Institute of Technology, 1998-1999.
Nominated for 1995 University Excellence in Teaching Award, Illinois Institute of Technology.
A. Polichnowski, K.A. Griffin, J. Long, G.A. Williamson, and A.K. Bidani, "Blood pressure - renal blood flow relationships in conscious angiotensin II- and phenylephrine-infused rats," Am. J. Physiol. Renal Physiol., published online, July 2013.
K. Griffin, A. Polichnowski, H. Licea-Vargas, M. Picken, J. Long, G.A. Williamson, and A.K. Bidani, "Large BP-dependent and -independent differences in susceptibility to nephropathy after nitric oxide inhibition in Sprague-Dawley rats from two major suppliers," Am. J. Physiol. Renal Physiol., vol. 302, no. 1, pp. F173-F182, January 2012.
A. Rahimi, G.A. Williamson, and A. Emadi, “Loop-cancellation technique: a novel non-linear feedback to overcome the destabilizing effect of constant power loads,” IEEE Trans. on Vehicular Technology, vol. 59, no. 2, pp. 650 661, February 2010.
A.K. Bidani, K.A. Griffin, G. Williamson, X. Wang, and R. Loutzenhiser, “Protective Importance of the Myogenic Response in the Renal Circulation,” Hypertension, vol. 54, pp. 393-398, 2009.
G.A. Williamson, R. Loutzenhiser, X. Wang, K. Griffin, and A.K. Bidani, “Systolic and mean blood pressures and afferent arteriolar myogenic response dynamics: a modeling approach,” Am. J. Physiol. Regul. Integr. Comp. Physiol., vol. 295, pp. R1502 - R1511, November 2008.
K.A. Griffin, M. Abu-Naser, I. Abu-Amarah, M. Picken, G.A. Williamson, A.K. Bidani, Anil, “Dynamic blood pressure load and nephropathy in the ZSF1 (fa/facp) model of type 2 diabetes,” Am. J. Physiol. Renal Physiol., vol. 293, pp. F1605-F1613, November 2007.
A.K. Bidani, M. Picken, R. Hacioglu, G.A. Williamson, and K.A. Griffin, “Spontaneously reduced BP load and the slow development of overt nephropathy in the rat streptozotocin-induced diabetes model, ” Am. J. Physiol. Renal Physiol., vol. 292, pp. F647-F654, February 2007.
R. Hacioglu, G.A. Williamson, I. Abu-Amarah, K.A. Griffin, and A.K. Bidani, “Characterization of dynamics in renal autoregulation using Volterra models,” IEEE Trans. on Biomed. Engr., vol. 53, no. 11, pp. 2166-2176, November 2006.
A. Emadi, A. Khaligh, C. Rivetta, and G.A. Williamson, “Constant power loads and negative impedance instability in automotive systems: definition, modeling, stability, and control of power electronic converters and motor drives,” IEEE Trans. on Vehicular Technology, vol. 55, no. 4, pp. 1112-1125, July 2006.
R. Loutzenhiser, K.A. Griffin, G.A. Williamson, and A.K. Bidani, “Renal autoregulation: new perspectives regarding the protective and regulatory roles of the underlying mechanisms,” Am. J. Physiol. Regul. Integr. Comp. Physiol., vol. 290, pp. R1153-R1167, 2006.
C. Rivetta, A. Emadi, G.A. Williamson, R. Jayabalan, and B. Fahimi, “Analysis and control of a buck DC-DC converter operating with constant power load in sea and undersea vehicles,” IEEE Trans. on Industry Applications, vol. 42, no. 2, pp. 559-572, March/April 2006.
B.E. Dunne and G.A. Williamson, “Analysis of gradient algorithms for TLS-based adaptive IIR filters,” IEEE Trans. on Signal Processing, vol. 52, no. 12, pp. 3345-3356, December 2004.