### Dr. Keqin Gu - Emeritus Distinguished Research Professor

**Monograph**

Gu, K., Kharitonov, V. L. and Chen, J. (2003), Stability of Time-Delay Systems, Birkhauser, Boston. (2^{nd} Edition is in preparation, signed contract).

** ****Edited Book **

Niculescu, S.-I. and Gu, K. (2004), Advances in Time-Delay Systems, Lecture Notes in Computational Science and Engineering, Springer, Berlin.

** ****Book Chapters **

Miao, G., Peet, M. and Gu, K. (2019), “Inversion of separable kernel operator and its application in control synthesis,” in Valmorbida, G, Seuret, A., Boussaada, I., and Sipahi, R., (editors), Delays and Interconnections: Methodology, Algorithms and Applications, Springer, pp. 265-280.

Gu, K. (2013), “Complete quadratic Lyapunov-Krasovskii functional: limitations, computational efficiency, and convergence,” in Sun, J.-Q. and Ding, Q. (editors), Advances in Analysis and Control of Time-delayed Dynamical Systems, World Scientific, pp. 1-19.

Gu, K., Zhang, Y., and Peet, M. M. (2012), “Positivity of complete Lyapunov-Krasovskii functionals in time-delay systems,” in Sipahi, R., Vyhlidal, T., Niculescu, S.-I., and Pepe, P. (editors), Time Delay Systems: Methods, Applications and New Trends, Lecture Notes in Control and Information Sciences, Springer, New York, pp. 35-47.

Niculescu, S.-I., Michiels, W., Gu, K. and Abdallah, C. T. (2010), “Delay effects on output feedback control of dynamical systems,” in F. M. Atay (editor) Complex Time-Delay Systems, Lecture Notes in Control and Information Sciences, Springer, New York, pp. 63-84.

Liu, Y., Li, H. and Gu, K. (2009), “Stability of Coupled Differential-Difference Equations with Block-Diagonal Uncertainty,” in J.-J. Loiseau, W. Michiels, S.-I. Niculescu, R. Sipahi (editors) *Topics in Time Delay Systems: Analysis, Algorithms and Control*, Springer, pp. 73-84.

Li, H. and Gu, K. (2009), “Lyapunov-Krasovskii Functional Approach for Coupled Differential-Difference Equations with Multiple Delays,” in B. Balachandran, T. Kalmar-Nagy, D. Gilsinn (editors) *Delay Differential Equations---Recent Advances and New Directions*, Springer, pp. 1-30.

Niculescu, S.-I., Morarescu, C.-I , Michiels, W. and Gu, K. (2007) “*Geometric Ideas in the Stability Analysis of Delay Models in Biosciences.” *In I. Queinnec, S. Tarbouriech, G. Garcia and S.-I. Niculescu (editors) Biology and Control Theory: Current Challenges, LNCIS, vol. 357, Springer Verslag, 2007, pp. 217-262.

Gu, K., Niculescu, S.-I. and Chen, J. (2007), “Computing maximum delay-deviation allowed to retain stability in systems with two delays,” in Loiseau J.-J. and Chiasson, J. (editors), Applications of Time Delay Systems, LNCIS, Vol. 352, Springer-Verlag, Berline, pp. 157-164.

Gu, K. and Niculescu S.-I. (2006), “Stability Analysis of Time-Delay Systems: A Lyapunov Approach,” in A. Loría, F. Lamnabhi-Lagarrigue, and E. Panteley (editors), Advanced Topics in Control Systems Theory: Lecture Notes from FAP 2005, Lecture Notes in Control and Information Sciences, Vol. 328**, **Springer-Verlag, Berlin, pp. 139-170.

Taoutaou, D., Niculescu, S.-I. and Gu, K. (2004), “Robust stability of teleoperation schemes subject to constant and time-varying communication delays,” in Niculescu, S.-I. and Gu, K. (editors), Advances in Time-Delay Systems, Lecture Notes in Computational Science and Engineering, Springer, Berlin, pp. 327-338.

Niculescu, S-I., Michiels, W., Melchor-Aguillar, D., Luzyanina, T., Mazenc, F., Gu, K. and Chatté. F. (2004), “Delay Effects on the Asymptotic Stability of Various Fluid Models in High-Performance Networks,” in Tarbouriech, S., Abdallah, C. T., Chiasson, J. (Editors), Advances in Communication Control Networks, Lecture Notes in Control and Information Sciences , Vol. 308, Springer-Verlag, Heidelberg, pp. 87-110.

**Book Reviews **

Gu, K., (2008), Book review of “Control of Dead-time Processes,” by J. E. Normey-Rico and E. F. Camacho. IEEE Control Systems Magazine, Vol. 28, No. 5, pp. 136-137.

Gu, K., (2006), Book review of “PID Controllers for Time-Delay Systems,” by Guillermo J. Silva, Aniruddha Datta, and S. P. Bhattacharyya. IEEE Control Systems Magazine, Vol. 26, No. 1, pp. 93-95.

Gu, K., (2005), Book review of “Methodologies for control of jump time-delay systems,” by Magdi S. Mahmoud and Peng Shi. Automatica, Vol. 41, No. 2, pp. 351-352.

Gu, K., (2000), Book review of “Stability and stabilization of infinite dimensional systems with applications,” by Luo, Z.-H., Guo, B.-Z. and Morgul, O., Automatica, Vol. 36, No. 11, pp. 1775-1776.

**Journals **

Phan-Van, H. and Gu, K. (2024). “Structured invariant subspace and decomposition of systems with time delays and uncertainties,” Accepted for publication in International Journal of Robust & Nonlinear Control.

Gu, K. and Phan-Van, H. (2024). “External Direct Sum Invariant Subspace and Decomposition of Coupled Differential-Difference Equations,” *IEEE Transactions on Automatic Control*, to appear in February 2024, http://doi.org/10.1109/TAC.2023.3274208 .

Gu, K., Ma, Q., Zhou, H., Mahzoon, S., Yang, X. (2022). “A geometric description of the set of stabilizing PID controllers,” Special Issue on PID Control, *International Journal on Nonlinear and Robust Control*, vol 32, no 18, pp 9475 – 9496.

Jin, C., Gu, K., Boussaada, I., Niculescu, S.-I. (2019), “Stability analysis of a more general class of systems with delay-dependent coefficients,” *IEEE Transactions on Automatic Control*, vol. 64, no. 5, pp. 1989 – 1998.

Jin, C., Gu, K., Niculescu, S.-I., and Boussaada, I. (2018), “Stability Analysis of Systems with Delay-Dependent Coefficients: an Overview,” *IEEE Access*, Vol 6, 2018, pp. 27392 – 27407. doi: *10.1109/ACCESS.2018.2828871.*

Irofti, D., Gu, K., Boussaada, I., Niculescu, S.-I. (2018), “Some geometric insights into the migration of double imaginary roots under small deviation of two parameters,” *Automatica*, Vol 88, pp. 91 – 97.

Ma, Q., Gu, K. and Choubedar, N. (2018), “Strong stability of a class of difference equations of continuous time and structured singular value problem,” *Automatica*, Vol 87, pp. 32 - 39.

Li, X., Gao, H., and Gu, K. (2016), “Delay-Independent Stability Analysis of Linear Time-Delay Systems Based on Frequency Discretization,” *Automatica*, Vol. 70, pp. 288 – 294.

Gu, K. and Zheng, X. (2014). “Stability crossing set for systems with three scalar delay channels,” *International Journal of Dynamics and Control*, Vol. 2, Issue 2, pp. 164-197.

Li, Y., Gu, K., Zhou, J. and Xu, S. (2014). “Estimating stable delay intervals with a discretized Lyapunov-Krasovskii functional formulation,” *Automatica*, Vol. 50, No. 6, pp. 1691-1697.

Naghnaeian, M. and Gu, K. (2013), “Stability crossing set for systems with two scalar-delay channels,” *Automatica*, Vol. 49, No. 8, pp. 2098-2106.

Gu, K. (2012). “A review of some subtleties of practical relevance for time-delay systems of neutral type,” commissioned spotlight article, *ISRN Applied Mathematics*, Vol. 2012, Article ID 725783, 46 pages, doi:10.5402/2012/725783.

Zhang, Y., Peet, M. M. and Gu, K. (2011). “Reducing the complexity of the sum-of-squares test for stability of delayed linear systems.” *IEEE Transactions on Automatic Control*, Vol. 56, No. 1, pp. 229-234.

Gu, K. and Naghnaian, M. (2011). “Stability crossing set for systems with three delays,” *IEEE Transactions on Automatic Control, *Vol. 56, No. 1, pp. 11-26.

Sipahi, R., Niculescu, S.-I., Abdallah, C. T., Michiels, W. and Gu, K. (2011). “Stability and stabilization of systems with time delay---limitations and opportunities,” *IEEE Control Systems Magazine*, Vol. 31, No. 1, pp. 38-65.

Gu, K., Zhang, Y. and Xu, S. (2011). “Small gain problem in coupled differential-difference equations, time-varying delays, and direct Lyapunov method,” *International Journal of Robust and Nonlinear Control*, Vol. 21, No. 4, pp. 429-451.

Morarescu, C.-I., Niculescu, S.-I. and Gu, K. (2010). “The Geometry of Stability crossing curves of PI controllers for SISO Systems with I/O delays,” *Revue Roumaine*, Vol. 55, No. 4, pp. 297-314.

Li, H. and Gu, K. (2010). “Discretized Lyapunov-Krasovskii Functional for Coupled Differential-Difference Equations with Multiple Delay Channels,” *Automatica,* Vol. 46, No. 5, pp.902-909.

Gu, K. (2010). “Stability Problem of Systems with Multiple Delay Channels,” *Automatica*, Vol. 46, No. 4, pp. 727-735.

Niculescu, S.-I., Kim, P., Gu, K., Lee, P., and Levy, D. (2010). “Stability Crossing Boundaries of Delay Systems Modeling Immune Dynamics in Leukemia” *Discrete and Continuous Dynamical Systems, Series B*, Vol. 13, No. 1, pp. 129-156.

Gu, K. (2009). “Discussions on ‘H-infinity Control of Distributed and Discrete Delay Systems via Discretized Lyapunov Functional’,” *European Journal of Control*, Vol 15, No 1, pp. 95-96.

Gu, K. and Liu, Y. (2009). “Lyapunov-Krasovskii Functional for Uniform Stability of Coupled Differential-Functional Equations,” *Automatica*, Vol 45, No. 3, pp. 798-804.

Morarescu, C.-I., Niculescu, S.-I., and Gu, K. (2007), “Stability crossing curves of shifted gamma-distributed delay systems,” *SIAM Journal on Applied Dynamical Systems*, Vol 6, No 2, pp. 475-493.

Morarescu, C.-I., Niculescu, S.-I., and Gu, K. (2007), “On the geometry of stability regions of Smith predictors subject to delay uncertainty,” *IMA Journal of Mathematical Control and Information*, Vol. 24, No. 3, pp. 411-423.

Gu, K., Niculescu, S.-I. and Chen, J. (2005), “On stability crossing curves for general systems with two delays,” *Journal of Mathematical Analysis and Applications*, Vol. 311, No. 1, pp. 231-253.

Han, Q.-L., Yu, X. and Gu, K. (2004), “On computing the maximum time-delay bound for stability of linear neutral systems,” *IEEE Transactions on Automatic Control*, Vol. 49, No. 12, pp.2281-2285.

Han, Q.-L., Gu, K. and Yu, X. (2003), “An improved estimate of time-delay in the robust stability problem of time-delay systems with norm-bounded uncertainty,” *IEEE Transactions on Automatic Control*, Vol. 48, No. 9, pp. 1629-1634.

Niculescu, S.-I. and Gu, K. (2003), “Robust stability of some oscillatory systems including time-varying delay with applications in congestion control,” *ISA Transactions*, Vol. 42, No. 4, pp. 595-603.

Luo, A. C. J. and Gu, K. (2003), “On resonant separatrix bands of a Duffing Oscillator with a twin-well potential,” *Chaos, Solitons and Fractals*, Vol. 15, No. 4, pp. 771-782.

Gu, K. (2003), “Refined discretized Lyapunov functional method for systems with multiple delays,” *International Journal of Robust and Nonlinear Control*, Vol. 13, No. 11, pp. 1017-1033.

Gu, K. (2003), “An improved stability criterion for systems with distributed delays,” *International Journal of Robust and Nonlinear Control*, Special Issue on Time Delay Systems, Vol. 13, No. 9, pp. 819-831.

Gu, K. and Niculescu, S.-I. (2003), “A survey of recent results in the stability and control of time delay systems,” *ASME Journal of Dynamic Systems, Measurement and Control*, Special Issue on Time Delay Systems, Vol. 125, No. 2, pp. 158-165.

Gu, K. (2001), “Discretization schemes for Lyapunov-Krasovskii functionals in time-delay systems,” Special Issue on Advances in Analysis and Control of Time-Delay Systems, *Kybernetika*, Vol. 37, No. 4, pp. 479-504.

Han, Q.-L. and Gu, K. (2001), “On robust stability of time-delay systems with norm-bounded uncertainty,” *IEEE Transactions on Automatic Control*, Vol. 46, No. 9, pp. 1426-1431.

Han, Q.-L. and Gu, K. (2001), “Stability of linear systems with time-varying delay: a generalized discretized Lyapunov functional approach,” *Asian Control Journal*, Vol. 3, No. 3, pp. 170-180.

Gu, K. (2001), “A further refinement of discretized Lyapunov functional method for the stability of time-delay systems,” *International Journal of Control*, Vol. 74, No. 10, pp. 967-976.

Gu, K., Han, Q.-L., Luo, A. C. J. and Niculescu, S.-I. (2001), “Discretized Lyapunov functional for systems with distributed delay and piecewise constant coefficients,” *International Journal of Control*, Vol. 74, No. 7, pp. 737-744.

Gu, K. and Niculescu, S.-I. (2001), “Further remarks on additional dynamics in various model transformations of linear delay systems,”* IEEE Transactions on Automatic Control*, Vol. 46, No. 3, pp. 497-500.

Han, Q.-L. and Gu, K. (2000), “Criteria for stability of uncertain linear systems with time-varying delay,” *International Journal of Applied Mathematics & Computer Science*, Vol. 10, No. 2, pp. 205-225.

Gu, K. and Niculescu, S.-I. (2000), “Additional dynamics in transformed time-delay systems,” *IEEE Transactions on Automatic Control*, Vol. 45, No. 3, pp. 572-575.

Gu, K. (1999), “Discretized Lyapunov functional for uncertain systems with multiple time-delay,” *International Journal of Control, *Vol. 72, No. 16, pp. 1436-1445.

Luo, A. C. J., Gu, K. and Han, R. P. S. (1999), “Resonant-separatrix webs in strochastic layers of the twin-well Duffing oscillator,”* Nonlinear Dynamics*, Vol. 19, No. 1, pp. 37-48.

Gu, K. (1999), “A generalized discretization scheme of Lyapunov functional in the stability problem of linear uncertain time-delay systems,” *International Journal of Robust and Nonlinear Control*, Vol. 9, No. 1, pp. 1-14.

Gu, K. (1997), “Discretized LMI set in the stability problem of linear uncertain time-delay systems,” *International Journal of Control*, Vol. 68, No. 4, pp. 923–934.

Gu, K., Ye, X. and Loh, N. K. (1995), “Design of control of discrete-time systems with uncertainties,” *Control Theory and Advanced Technology*, Vol. 10, No. 4, Part 5, pp. 1899–1912.

Gu, Keqin (1995), “Absolute stability of systems under block diagonal memoryless uncertainties,” *Automatica*, Vol. 31, No. 4, pp. 581–584.

Gu, Keqin (1995), “Algorithms for studying the trade-offs between attenuation and uncertainty tolerance,” *International Journal of Control*, Vol. 61, No. 4, pp. 823–836.

Gu, Keqin (1994), “Comments on ‘convexity of frequency response arcs associated with a stable polynomial’,” *IEEE Transactions on Automatic Control*, Vol. 39, No. 11, pp. 2262–2265.

Gu, Keqin (1994), “ control of systems under norm bounded uncertainties in all system matrices,” *IEEE Transactions on Automatic Control*, Vol. 39, No. 6, pp. 1320–1322.

Gu, Keqin (1994), “Designing stabilizing control of uncertain systems by quasiconvex optimization,” *IEEE Transactions on Automatic Control*, Vol. 39, No. 1, pp. 127–131.

Gu, Keqin and Loh, N. K. (1993), “Direct computation of stability bound for systems with polytopic uncertainties,” *IEEE Transactions on Automatic Control*, Vol. 38, No. 2, pp. 363–366.

Gu, Keqin and Tongue, Benson H. (1991), “New robot adaptive control strategies through nonholonomic transformations,” *International Journal of Robotics Research*, Vol. 10, No. 5, pp. 505–514.

Zohdy, M. A., Gu, K., Tantawy, H. S. and Fadali, M. S. (1991), “Robust eigenstructure assignment for multiinput systems,” *International Journal of Control*, Vol. 54, No. 5, pp. 1273–1280.

Gu, Keqin and Chen, Y. H. (1991), “Linear control guaranteeing stability of uncertain systems via orthogonal decomposition,” *Automatica*, Vol. 27, No. 5, pp. 873–876.

Gu, K., Chen, Y. H., Zohdy, M. A. and Loh, N. K. (1991), “Quadratic stabilizability of uncertain systems: a two level optimization setup,” *Automatica*, Vol. 27, No. 1, pp. 161–165.

Chai, W. J., Gu, K. and Loh, N. K. (1991), “Transforming time-varying multivariable systems into block companion canonical forms,” C*omputers & Mathematics with Applications-An International Journal*, Vol. 21, No. 2–3, pp. 57–67.

Gu, K and Tongue, B. H. (1990), “A new strategy of adaptive control for robot,” *ASME Journal of Dynamic Systems, Measurement & Control*, Vol. 112, No. 3, pp. 410–416.

Gu, Keqin, Zohdy, M. A. and Loh, N. K. (1990), “Necessary and sufficient conditions of quadratic stability of uncertain linear systems,” *IEEE Transactions on Automatic Control*, Vol. 35, No. 5, pp. 601–604.

Tongue, Benson H. and Gu, Keqin (1989), “Adaptive mesh strategies for interpolated mapping procedures,” *International Journal of Engineering Science*, Vol. 27, No. 10, pp. 1144–1154.

Tongue, Benson H. and Gu, Keqin (1988), “A higher order method of interpolated cell mapping,” Journal of Sound and Vibration, Vol. 125,

No. 1, pp. 169–179.

Tongue, Benson H. and Gu, Keqin (1988), “Interpolated cell mapping of dynamical systems,” *ASME Journal of Applied Mechanics*, Vol. 55,

No. 2, pp. 461–466.

Tongue, Benson H. and Gu, Keqin (1988), “A theoretical basis for interpolated cell mapping,” *SIAM Journal of Applied Mathematics*, Vol. 46, No. 5, pp. 1206–1214.

Gu, Keqin and Tongue, Benson H. (1987), “A method to improve the modal convergence for structures with external forcing,”* ASME Journal of Applied Mechanics*, Vol. 54, No. 4, pp. 904–909.

**Conferences **

Gu, K. (2022), “External direct sum invariant subspace and decomposition of coupled differential-difference equations,” 2022 American Control Conference, Atlanta, GA, June 8 – 10, 2022.

Keqin Gu, Qian Ma, Huiqing Zhou, Salma Mahzoon, Xingzi Yang (2020), “A geometric description of the set of stabilizing PID controllers,” 21st IFAC World Congress, Berlin, Germany, July 12-17, 2020.

Peet, M. and Gu, K. (2019), “SOS for systems with multiple delays: part 1. H∞-optimal control,” 2019 American Control Conference, Philadelphia, PA, July 10-12, 2019.

Peet, M. and Gu, K. (2019), “SOS for systems with multiple delays: part 2. H∞-optimal estimation,” 2019 American Control Conference, Philadelphia, PA, July 10-12, 2019.

Peet, M. and Gu, K. (2018), “Synthesis of full-state observer for time-delay systems using SOS,” the 23rd International Symposium on Mathematical Theory of Networks and Systems, Hong Kong University of Science and Technology, Hong Kong, July 16 – 20, 2018.

Jin, C., Boussaada, I., Niculescu, S.-I., and Gu, K. (2017), “An Overview of Stability Analysis of Systems with Delay Dependent Coefficients,” 21st International Conference on System Theory, Control and Computing, Sinaia, Romania, Oct 19-21, 2017.

Jin, C., Niculescu, S.-I., Boussaada, I., and Gu, K. (2017), “Stability Analysis of Control Systems subject to Delay-Difference Feedback,” 20^{th} IFAC World Congress, Toulouse, France, July, 9-14, 2017.

Ma, Q., Gu, K., and Choubedar, N. (2017), “Further results on the strong stability of difference equations of continuous time,” 20^{th} IFAC World Congress, Toulouse, France, July, 9-14, 2017.

Miao, G., Peet, M., and Gu, K. (2017), “Inversion of Separable Kernel Operators in Coupled Differential-Functional Equations and Application to Controller Synthesis,” 20^{th} IFAC World Congress, Toulouse, France, July, 9-14, 2017.

Jin, C., Gu, K., Boussaada, I., and Niculescu, S.-I. (2017), “A two-parameter approach to the stability problem of systems with delay-dependant coefficients,” 2017 American Control Conference, Seattle, WA, May 24-26, 2017.

Gu, K., Jin, C., Boussaada, I., and Niculescu, S.-I. (2016), “Towards more general stability analysis of systems with delay-dependent coefficients,” 55^{th} IEEE Conference on Decision and Control, Las Vegas, NV, Dec 12 – 14, 2016.

Irofti, D. A., Gu, K., Boussaada, I., and Niculescu, S.-I (2016), “Migration of imaginary roots of multiplicity three and four under small deviation of two delays in time-delay systems,” European Control Conference, Aalborg, Denmark, June 29 - July 1, 2016.

Gu, K, Irofti, D. A., Boussaada, I., and Niculescu, S.-I. (2015), “Migration of Double Imaginary Characteristic Roots under Small Deviation of Two Delay Parameters,” 54th IEEE Conference on Decision and Control, Osaka, Japan, Dec 15 – 18, 2015, pp 6410-6415.

Wang, X., and Gu, K., (2014), “Time-delay power systems control and stability with Discretized Lyapunov Functional method,” Control Conference (CCC), 33rd Chinese Control Conference, Nanjing, China, June 28-30, 2014, pp. 7004-7009.

Gu, K. and Zheng, X., (2014), “An overview of stability crossing set for systems with scalar delay channels,” 33rd Chinese Control Conference, Nanjing, China, June 28-30, 2014, pp. 2676-2681.

Li, Y., Gu, K. and Xu, S., (2013), “Estimating Stable Delay Interval Using Discretized Lyapunov-Krasovskii Functional Method,” 10th IEEE International Conference on Control & Automation, Hangzhou, China, June 12-14, 2013, pp. 21-26.

Morarescu, I.-C., Méndez-Barrios, C.-F., Niculescu, S.-I., and Gu, K., (2011), “Stability Crossing Boundaries and Fragility Characterization of PID Controllers for SISO Systems with I/O Delays,” 2011 American Control Conference, San Francisco, CA, June 29-July 1, 2011, pp 4988-4993.

Naghnaeian, M. and Gu, K. (2011), “Stability crossing set for systems with two scalar-delay channels,” the 18th IFAC World Congress, Milan, Italy, August 28-September 2, 2011, pp. 1453-1458.

Gu, K., Zhang, Y. and Peet, M. (2010), “Accelerating Convergence of Sum-of-Square Stability Analysis of Coupled Differential-Difference Equations,” 9^{th} IFAC Workshop on Time Delay Systems, Prague, Czech Republic, June 7-9, 2010, pp. 138-143.

Zhang, Y., Peet, M. and Gu, K. (2010), “Reducing the Computational Cost of the Sum-of-Squares Stability Test for Time-Delayed Systems,” 2010 American Control Conference, Baltimore, MD, June 30-July 02, 2010, pp. 5018-5023.

Gu, K. and Naghnaeian, M. (2009), “On Stability Crossing Set for General Systems with Three Delays---Part 1. Crossing Frequency Set,” 8^{th} IFAC Workshop on Time Delay Systems, Sinaia, Romania, September 1-3, 2009.

Gu, K. and Naghnaeian, M. (2009), “On Stability Crossing Set for General Systems with Three Delays---Part 2. Stability Crossing Set,” 8^{th} IFAC Workshop on Time Delay Systems, Sinaia, Romania, September 1-3, 2009.

Li, H. and Gu, K. (2009), “Discretized Lyapunov-Krasovskii Functional Method for Coupled Differential-Functional Equations with Discrete and Distributed Delays,” 7^{th} Asian Control Conference, Hong Kong, August 27-29, 2009, pp. 39-44.

Gu, K. (2009), “Towards More Effective Representation of Time-Delay Systems,” Distinguished Invited Lecture, the 4^{th} IEEE Conference on Industrial Electronics, and Applications, Xian, China, May 25-27, 2009, pp. 25-27.

Li, H. and Gu, K. (2008), “Discretized Lyapunov-Krasovskii Functional for Systems with Multiple Delay Channels,” 2008 ASME Dynamic Systems and Control Conference, Ann Arbor, MI, October 20-22, 2008, pp. 1317-1324.

Gu, K. (2008), “Large Systems with Delays in a Small Number of Channels,” Semi-plenary speech, 2008 Chinese Control and Decision Conference, Yantai, China, July 2-4, 2008, pp. 28-37.

Méndez-Barrios, C., Niculescu, S.-I., Morărescu, C.-I. and Gu, K. (2008) “On the Fragility of PI Controllers for Time-Delay SISO Systems,” 16th Mediterranean Conference on Control and Automation. Ajaccio, Corsica, France on June 25-27, 2008, pp. 529-534.

Liu, Y., Li, H. and Gu, K. (2008), “Stability of Differential-Difference Equations with Norm-Bounded Uncertainty,” 7th World Congress on Intelligent Control and Automation, Chongqing, China, June 25-27, 2008, pp. 295-300.

Gu, K. and Liu, Y. (2007), “Lyapunov-Krasovskii Functional for Coupled Differential-Functional Equations,” 46^{th} IEEE Conference on Decision and Control, New Orleans, Louisiana, December 12-14, 2007, pp. 2083-2088.

Morarescu, C.-I., Niculescu, S.-I. and Gu, K. (2007), “On the geometry of PI controllers for SISO systems with input delays,” 7^{th} IFAC Workshop on Time-Delay Systems, Nantes, France, September 17-19, 2007, pp. 411-423.

Morarescu, C.-I., Niculescu, S.-I. and Gu, K. (2006), “Some remarks on smith predictors: a geometric point of view,” 6th IFAC Workshop on Time Delay Systems, L’Aquila, Italy, July 10-12, 2006, pp. 264-269.

Niculescu, S.-I., Kim, P., Gu, K., Levy, D. (2006), “On the Stability Crossing Boundaries of Some Delay Systems Modeling Immune Dynamics in Leukemia,” 17th International Symposium on Mathematical Theory of Networks and Systems, Kyoto, Japan, July 24-28, 2006, pp. 2637–2647.

Morarescu, C.-I., Niculescu, S.-I. and Gu, K. (2005), “Remarks on the stability crossing curves of some distributed delay systems,” 2005 Conference on Differential and Difference Equations and Applications, Melbourne, FL, August 1-5, 2005, pp. 815-823.

Gu, K. (2005), “Stability analysis of DDAE: A Lyapunov approach (Abstract),” in Invited Session MS 27: “Stability of Delay Differential Algebraic Equations with Applications,” SIAM Conference on Control and Its Applications, New Orleans, LA, July 11-14, 2005.

Gu, K., Niculescu, S.-I. and Chen, J. (2004), “On stability crossing curves for general systems with two delays,” *5 ^{th} IFAC Workshop on Time Delay Systems*, Leuven, Belgium, September 8-10, 2004, pp. 167-172.

Gu, K., Niculescu, S.-I. and Chen, J. (2004), “On calculating the maximum radius of delay deviation,” *Sixteenth International Symposium on Mathematical Theory of Networks and Systems (MTNS2004)*, Leuven, Belgium, July 5-9, 2004.

Taoutaou, D., Niculescu, S.-I. and Gu, K. (2003), “Robust Stability of Teleoperation Schemes Subject to Constant and Time Varying Communication Delays,” *Conference on Decision and Control*, Maui, HI, December 9-12, 2003, 5579 - 5584.

Niculescu, S.-I., Rasvan, V. and Gu, K. (2003), “On delay-dependent stability in lossless propagation models: a Liapunov-Krasovskii analysis,” *11th IEEE Mediterranean Conference on Control and Automation*, Rhodes, Greece, June 17-20, 2003.

Niculescu, S.-I., Gu, K. and Abdallah, C. T. (2003), “Some remarks on the delay stabilizing effect in SISO systems,” *2003 American Control Conference*, Denver, CO, June 4-6, 2003, pp. 2670-2675.

Niculescu, S.-I. and Gu, K. (2002), “Robust stability of some oscillatory systems including time-varying delay with applications in congestion control,” *4th Asian Control Conference, Singapore, September 25-27, 2002.*

Weinberg, J. B., Engel, G. L., Gu, K., Karacal, C. S., Smith, S. R., White, W. W. and Yu, X. W. (2001), “A multidisciplinary model for using robotics in engineering education,” Proceedings of the 2001 American Society for Engineering Education Annual Conference & Exposition (Session 2620), Albuquerque, NM, June 24-27, 2001.

Gu, K. and Han, Q.-L. (2001), “A revisit of some delay-dependent stability criteria for uncertain time-delay systems,” *3 ^{rd} IFAC Workshop on Time Delay Systems*, Santa Fe, NM, December 8-10, 2001, pp. 129-134.

Gu, K. (2001), “An improved stability criterion for systems with distributed delays,” *3 ^{rd} IFAC Workshop on Time Delay Systems*, Santa Fe, NM, December 8-10, 2001, pp. 111-116.

Han, Q.-L. and Gu, K. (2001), “Stability criteria for linear time-delay systems with multiple passive uncertainties,” *3 ^{rd} IFAC Workshop on Time Delay Systems*, Santa Fe, NM, December 8-10, 2001, pp. 267-272.

Gu, K. (2001), “Refined discretized Lyapunov functional method for systems with multiple delays,” 40^{th} *Conference on Decision and Control*, Orlando, FL, December 4-7, 2001, pp. 985-990.

Han, Q.-L. and Gu, K. (2001), “On robust stability of time-delay systems with block-diagonal uncertainty,” *40th Conference on Decision and Control*, Orlando, FL, December 4-7, 2001, pp. 3202-3207.

Gu, K. (2001), “A further refinement of discretized Lyapunov functional method for the stability of time-delay systems,” 2001 American Control Conference, Arlington, VA, June 25-27, 2001, pp. 3998-4003.

Han, Q.-L. and Gu, K. (2001), “On robust stability of time-delay systems with norm-bounded uncertainty,” *American Control Conference*, Arlington, VA, USA. June 25-27, 2001, pp. 4644-4649.

Gu, K. (2000), “An integral inequality in the stability problem of time-delay systems,” *39 ^{th} Conference on Decision & Control*, Sidney, Australia, December 12-15, pp. 2805-2810.

Gu, K. and Han, Q.-L. (2000), “Controller design for time-delay systems using discretized Lyapunov functional approach,” *39 ^{th} Conference on Decision & Control*, Sidney, Australia, December 12-15, pp. 2793-2798.

Gu, K. and Han, Q.-L. (2000), “Discretized Lyapunov functional for linear uncertain systems with time-varying delay,”* 2000 American Control Conference*, Chicago, IL, June 28-30, pp. 1375-1379.

Gu, K. and Niculescu, S.-I. (2000), “Further remarks on additional dynamics in various model transformations of linear delay systems,”* 2000 American Control Conference*, Chicago, IL, June 28-30, pp. 4368-4372.

Kolmanovskii, V. B., Niculescu, S.-I. and Gu, K. (1999), “Delay effects on stability and control: a survey,” *38th Conference on Decision & Control*, Phoenix, AZ, December 7-10, pp. 1993-1998.

Gu, K. and Niculescu, S.-I. (1999), “Additional dynamics in transformed time-delay systems,” *38th Conference on Decision & Control*, Phoenix, AZ, December 7-10, pp. 4673-4677.

Gu, K. (1999), “Partial solution of LMI in stability problem of time-delay systems,” *38th Conference on Decision & Control*, Phoenix, AZ, December 7-10, pp. 227-232.

Gu, K. (1999), “Discretized Lyapunov functional for uncertain systems with multiple time-delay,” *38th Conference on Decision & Control*, Phoenix, AZ, December 7-10, pp. 2029-2034.

Gu, K., Luo, A. C. J. and Niculescu, S.-I. (1999), “Discretized Lyapunov functional for systems with distributed delay,” *Proceesings of 1999 European Control Conference*, Karlsruhe, Germany, Aug.31-Sept. 3, pp. DM-12-1.

Gu, K. (1998), “Stability of linear time-delay systems with block-diagonal uncertainty,” *1998 American Control Conference*, Philadelphia, PA, June 24-26, pp. 1943-1947.

Gu, K. (1997), “Discretization schemes of Lyapunov functional in the stability problem of linear uncertain time-delay systems,” *35 ^{th} Annual Allerton Conference*, University of Illinois, Urbana, IL, September 29-October 1, pp. 631-640.

Gu, K. (1997), “Constrained LMI set in the stability problem of linear uncertain time-delay systems,” *1997 American Control Conference*, Albuquerque, NM, June 4-6, 1997, Vol. 6, pp. 3657–3661.

Gu, K. (1997), “Discretization of Lyapunov functional for uncertain time-delay systems,” *1997 American Control Conference*, Albuquerque, NM, June 4-6, Vol. 1, pp. 505–509.

Gu, K. (1995), “Guaranteed convergence ratio of systems with time-varying uncertainties,” *1995 American Control Conference*, Seattle, WA, June 21–June 23, Vol. 1, pp. 978–981.

Gu, K. (1994), “Absolute stability under uncertainties satisfying reciprocal relations,” *1994 American Control Conference*, Baltimore, MD, June 29–July 1, Vol. 3, pp. 3000–3001.

Gu, K., Ye, X. and Loh, N. K. (1993), “Design of control of discrete-time systems with uncertainties,” *32 ^{nd} IEEE Conference on Decision and Control*, San Antonio, TX, December 15–17, Vol. 1, pp. 39–44.

Gu, K. (1993), “ control of systems with uncertainties in all entries,” 32^{nd} *IEEE Conference on Decision and Control*, San Antonio, TX, December 15–17, Vol. 2, pp. 1666–1670.

Gu, K. (1993), “The trade-off between attenuation and uncertainty tolerance by quasiconvex optimization,'' *1993 American Control Conference*, San Francisco, CA, June 2–4, Vol. 2, pp. 1666–1670.

Gu, K. (1992), “Duality in designing stabilizing control of uncertain linear systems,” *31st IEEE Conference on Decision and Control*, Tucson, AZ, December 16–18, Vol. 3, pp. 2894–2895.

Gu, K. (1992), “Flexible robot control: why does assumed mode method work?” *International Symposium on Implicit and Nonlinear Systems*, Fort Worth, TX, December 14–15, pp. 15–20.

Gu, K. (1992), “Linear feedback stabilization of arbitrary time-varying uncertain systems,” *1992 American Control Conference*, Chicago, IL, June 24–26, Vol. 4, pp. 2893–2894.

Gu, K. (1991), “Fixed order output feedback stabilization of uncertain systems,” *Control of Systems with Inexact Dynamic Models*, Proceedings of 1991 ASME Winter Annual Meeting, Atlanta, GA, December 1–6, DSC-Vol. 33, pp. 7–13.

Wise, K, Godhwani, A., Gu, K., Dierks, M. W., Kerkemeyer, B., Tang, J. (1991), “Linear and nonlinear flight control of the AIAA controls design challenge airplane,” *1991 AIAA GNC Conference*, New Orleans, LA, October 1991.

Chai, W. J., Loh, N. K. and Gu, K. (1991), “Robust stabilization of uncertain linear discrete-time systems,” *International Conference on Information & Systems*, Hangzhou, China, October 1991, pp. 1157–1162.

Gu, K. (1991), “Quadratic stability bound of discrete-time uncertain systems,” *1991 American Control Conference*, Boston, MA, June 1991, Vol. 2, pp. 1951–1955.

Gu, K. and Loh, N. K. (1990), “Maximum bound of quadratic stability for possibly fast time varying polytopic uncertainties,” *1990 American Control Conference*, San Diego, CA, May 1990, Vol. 3, pp. 2632–2636.

Gu, K., Chai, W. J. and Loh, N. K. (1990), “Towards less conservative stability criterion for discrete-time linear uncertain systems,” *1990 American Control Conference*, San Diego, CA, May 1990, Vol. 2,

pp. 1145–1149.

Gu, K., Zohdy, M. A. and Loh, N. K. (1989), “Necessary and sufficient conditions of quadratic stability of uncertain linear systems,” *28th IEEE Conference on Decision and Control*, Tampa, FL, December 1989, Vol. 1, pp. 464–468.

Gu K. and Chen, Y. H. (1989), “Uncertain systems: new uncertainty characterization for linear control design,” *28th IEEE Conference on Decision and Control*, Tampa, FL, December 1989, Vol. 2,

pp. 1508–1512.

Gu, K. and Tongue, B. H. (1988), “On adaptive motion control of robot manipulator and its fast implementation,” *Proceedings of the USA-Japan Symposium on Flexible Automation*, Minneapolis, MN, July 1988, pp. 205–312.

**REFERENCES**

**Dr. S. Cem Karacal**, Professor and Associate Dean, School of Engineering, Southern Illinois University Edwardsville, Edwardsville, Illinois 62026-1805. Telephone: (618)650-2435. E-mail: skaraca@siue.edu.

**Dr. Albert Luo**, Professor, Department of Mechanical & Industrial Engineering, Southern Illinois University Edwardsville, Edwardsville, Illinois 62026-1805. Telephone: (618)650-5389. E-mail: aluo@siue.edu.

**Dr. Majid Molki,** Distinguished Research Professor and Chair, Department of Mechanical & Industrial Engineering, Southern Illinois University Edwardsville, Edwardsville, Illinois 62026-1805. Telephone: (618)650-2372. E-mail: mmolki@siue.edu.

**Dr. Andre L. Tits,** Automatica Editor, Professor, Dept of Electrical and Computer Eng. and Institute for Systems Research, University of Maryland, College Park, MD 20742.

Telephone: (301)405-3669. Email: andre@umd.edu.

** ****Dr. Silviu-Iulian Niculescu**, Research Director at CNRS, Head of Laboratoire de Signaux et Systemes (L2S), Supelec, 3 rue Joliot Curie, 91190 Gif-sur-Yvette, France. Telephone: +33-1-69-85-17-11. E-mail: silviu.niculescu@lss.supelec.fr.

Cell Phone: 33-6-20-38-31-34.

**Dr. Catherine F. Yang**, Professor and Chair, Department of Chemistry and Biochemistry Program, Rowan University, Glassboro, NJ 08028. Vice-President, Zhejiang University Education Foundation (USA). Telephone: (856)256-5455. E-mail: yang@rowan.edu.