Research

Dr. Gumussoy is a senior key expert on data-driven control at Autonomous Systems & Control Group at Siemens Technology in Princeton, NJ. His general research interests are learning, control, identification, optimization and scientific computing with particular focus on reinforcement learning, data-driven control, frequency domain system identification, time-delay systems and their numerical software implementations.

He serves as an Associate Editor in IEEE Transactions on Control Systems Technology and IEEE Conference Editorial Board. He is a Senior Member of IEEE and a member of IFAC Technical Committee on Linear Control Systems.

Linkedin, Google Scholar, Email: first_name at last_name dot net

Software

@ Siemens: Jointly architected a reinforcement learning toolbox, SCS-Reinforce, inside Simcenter Studio with Siemens DI SW. Working together for the next cool features for our customers. Implemented new algorithms for tuning and calibration of power systems.

@ MathWorks: Key contributions to Control System Toolbox, Robust Control Toolbox, System Identification Toolbox and Reinforcement Learning Toolbox. Some highlights:

@ University of Leuven: Designed and implemented a MATLAB toolbox for Analysis and control for time-delay systems. The toolbox includes numerical algorithms for H-infinity norm and pseudospectral abscissa computations and H-infinity controller design using nonsmooth, nonconvex optimization methods.

@ New York University, Courant Institute of Mathematical Sciences: Contributed to the MATLAB toolbox for fixed-order controller design (HIFOO). This toolbox solves several key control problems including fixed-order (strong/simultaneous) stabilization, H & H2 optimization for mixed problems and multiple plants.

Publications

Patents

[P1] S. Gumussoy, P. J. Mosterman, A. Ozdemir, Discretization of a model of a system or a portion of the model using system inputs and outputs. US Patent App., 15/656,560, 2019.

Journal Papers

[J19] N. Xue, X. Wu, S. Gumussoy, U. Muenz, A. Mesanovic, Z. Dong, G. Bharati, S. Chakraborty, L. Cockcroft and L. Dangelmaier, Dynamic Security Optimization for N-1 Secure Operation of Hawai‘i Island System with 100% Inverter-Based Resources. IEEE Transactions on Smart Grid, vol. 13, no. 5, pp. 4009-4021, September 2022.

[J18] S. An, G. Bhat, S. Gumussoy and U. Y. Ogras, Transfer Learning for Human Activity Recognition using Representational Analysis of Neural Networks. ArXiv, 2020.

[J17] G. Bhat, S. Gumussoy and U. Y. Ogras, Analysis and Control of Power-Temperature Dynamics in Heterogeneous Multiprocessors. Transactions on Control Systems Technology, vol. 29, no. 1, pp. 329-341, 2020. [ arXiv ]

[J16] S. Gumussoy and M. Abu-Khalaf, Analytic Solution of a Delay differential Equation Arising in Cost Functionals for System with Distributed Delays. Transactions on Automatic Control, vol. 64, no. 11, pp. 4833-4840, 2019. [ arXiv ]

[J15] U. Gupta, M. Babu, R. Ayoub, M. Kishinevsky, F. Paterna, S. Gumussoy and U. Y. Ogras, An Online Learning Methodology for Performance Modeling of Graphics Processors. IEEE Transactions on Computers, vol. 67, no. 12, pp. 1677-1691, 2018. [ arXiv ]

[J14] M. Abu-Khalaf and S. Gumussoy, Comments on: “Lyapunov matrices for a class of time delays systems” by V. L. Kharitonov. Arxiv, 2018.

[J13] G. Bhat, S. Gumussoy and U. Y. Ogras, Power-Temperature Stability and Safety Analysis for Multiprocessor Systems. ACM Transactions on Embedded Computing Systems, vol. 16, no. 5, pp. 145:1-20, 2017. [ arXiv ]

[J12] S. Gumussoy and W. Michiels, Computation of extremum singular values and the strong H-infinity norm of SISO time-delay systems. Automatica, vol. 54, pp. 266-271, 2015. [ arXiv ]

[J11] S. Gumussoy and W. Michiels, Root-Locus for SISO Dead-Time Systems: A Continuation Based Approach. Automatica, vol. 48, no. 3, pp. 480-489, 2012. [ arXiv ]

[J10] T. D. Quoc, S. Gumussoy, W. Michiels and M. Diehl, Combining Convex-Concave Decomposition and Linearization Approaches for Static Feedback Controller Design (Regular Paper). IEEE Transactions on Automatic Control, vol. 57, no. 6, pp. 1377-1390, 2012. [ arXiv ]

[J9] S. Gumussoy, Coprime Inner/Outer Factorization of SISO Time-Delay Systems and FIR Structure of Their Optimal H-Infinity Controllers. International Journal of Robust and Nonlinear Control, vol. 22, no. 9, pp. 981-998, 2012. [ arXiv ]

[J8] S. Gumussoy and W. Michiels, Fixed-Order H-infinity Control for Interconnected Systems using Delay Differential Algebraic Equations. SIAM Journal on Control and Optimization, vol. 49, no. 2, pp. 2212-2238, 2011. [ arXiv ]

[J7] S. Gumussoy, Relative Stability Analysis of Closed-Loop SISO Dead-Time Systems: Non-imaginary Axis Case. Transactions of the Institute of Measurement and Control, vol. 34, no. 4, pp. 411-421, 2011. [ arXiv ] [ paper ]

[J6] W. Michiels and S. Gumussoy, Characterization and Computation of H-infinity Norms for Time-Delay Systems. SIAM Journal on Matrix Analysis and Applications, vol. 31, no. 4, pp. 2093-2115, 2010. [ arXiv ]

[J5] S. Gumussoy and W. Michiels, A Predictor-Corrector Type Algorithm for the Pseudospectral Abscissa Computation of Time-Delay Systems (Regular Paper). Automatica, vol. 46, no. 4, pp. 657-664, 2010. [ arXiv ]

[J4] S. Gumussoy and H. Ozbay, Sensitivity Minimization by Strongly Stabilizing Controllers for a Class of Unstable Time-Delay Systems. IEEE Transactions on Automatic Control, vol. 54, no. 3, pp. 590-595, 2009. [ arXiv ]

[J3] S. Gumussoy and H. Ozbay, Stable H-infinity Controller Design for Time-Delay Systems. International Journal of Control, vol. 81, no. 4, pp. 546-556, 2008. [ arXiv ]

[J2] S. Gumussoy and H. Ozbay, Remarks on Strong Stabilization and Stable H-infinity Controller Design. IEEE Transactions on Automatic Control, vol. 50, no. 12, pp. 2083-2087, 2005. [ arXiv ]

[J1] S. Gumussoy and H. Ozbay, On the Mixed Sensitivity Minimization for Systems with Infinitely Many Unstable Modes. Systems and Control Letters, vol. 53, no. 3-4, pp. 211-216, 2004. [ arXiv ]

Conference Proceedings and Abstracts

[C34] T. Basaklar, Y. Tuncel, S. Gumussoy and U. Y, Ogras, GEM-RL: Generalized Energy Management of Wearable Devices using Reinforcement Learning. Accepted to Design, Automation and Test in Europe (DATE), 2023.

[C33] K. Fetzer, J. Menu and S. Gumussoy, Rule Extraction for Black-box Algorithm Analysis and Implementation. 15th Simulation and Digital Twin Conference, Munich, Germany, 2022.

[C32] S. Gumussoy, SSD–Software for Systems with Delays: Reproducible Examples and Benchmarks on Model Reduction and H2 Norm Computation. Joint IFAC Conference: SSSC-TDS-LPVS, Montreal, Canada, 2022. [ arXiv ]

[C31] N. Xue, X. Wu, S. Gumussoy, U. Muenz, A. Mesanovic, Z. Dong, G. Bharati, S. Chakraborty, L. Cockcroft and L. Dangelmaier, Dynamic Security Optimization for N-1 Secure Operation of Power Systems with 100% Non-Synchronous Generation: First experiences from Hawai'i Island. IEEE Power & Energy Society General Meeting, 2021.

[C30] T. Basaklar, Y. Tuncel, S. Y. Narayana, S. Gumussoy and U. Y. Ogras, Hypervector Design for Efficient Hyperdimensional Computing on Edge Devices. tinyML Research Symposium, 2021.

[C29] G. Bhat, S. Gumussoy and U. Y. Ogras, Power and Thermal Analysis of Commercial Mobile Platforms: Experiments and Case Studies. Design, Automation & Test in Europe Conference & Exhibition (DATE), pp. 144-149, 2019. [ arXiv ]

[C28] S. Gumussoy, and H. Ozbay, On Feedback Stabilization of Neutral Time Delay Systems with Infinitely Many Unstable Poles. 14th IFAC Workshop on Time Delay Systems, Budapest, Hungary, June 28-30, 2018.

[C27] S. Gumussoy, A. A. Ozdemir, T. McKelvey, L. Ljung, M. Gibanica, and R. Singh, Improving Linear State-space Models with Additional Iterations. 18th IFAC Symposium on System Identification, Stockholm, Sweden, July 9-11, 2018. [ arXiv ]

[C26] G. Bhat, S. Gumussoy and U. Y. Ogras, Power-Temperature Stability and Safety Analysis for Multiprocessor Systems. 54th Design Automation Conference, Austin, Texas, USA, June 18-22, 2017. [ preprint ]

[C25] A. A. Ozdemir and S. Gumussoy, Transfer Function Estimation in System Identification Toolbox via Vector Fitting. 20th IFAC World Congress, Toulouse, France, July 9-14, 2017. [ arXiv ]

[C24] U. Gupta, J. Campbell, U. Y. Ogras, R. Ayoub, M. Kishinevsky, F. Paterna and S. Gumussoy, Adaptive Performance Prediction for Integrated GPUs. International Conference on Computer-Aided Design (ICCAD), Austin, USA, November 7-10, 2016. [ preprint ]

[C23] S. Gumussoy, B. Eryilmaz and P. Gahinet, Working with Time-Delay Systems in MATLAB. 10th IFAC Workshop on Time-Delay Systems, Boston, USA, June 22-24, 2012. [ arXiv ]

[C22] W. Michiels and S. Gumussoy, Eigenvalue based Analysis and Controller Synthesis for Systems described by Delay Differential Algebraic Equations. 10th IFAC Workshop on Time-Delay Systems, Boston, USA, June 22-24, 2012. [ arXiv ]

[C21] S. Gumussoy and W. Michiels, Direct Strong H-infinity Norm Computation for SISO Time-Delay Systems (invited session). 3rd International Conference on Control and Optimization with Industrial Applications, Ankara, Turkey, August 22-24, 2011.

[C20] D. Arzelier, G. Deaconu, S. Gumussoy and D. Henrion, H2 for HIFOO (invited session). 3rd International Conference on Control and Optimization with Industrial Applications, Ankara, Turkey, August 22-24, 2011. [ abstract ]

[C19] S. Gumussoy and W. Michiels, Fixed-order strong H-infinity control of interconnected systems with time-delay (minisymposium). 18th IFAC World Congress, Milano, Italy, August 28-September 2, 2011. [ arXiv ]

[C18] S. Gumussoy and W. Michiels, On the sensitivity of the H-infinity norm of interconnected systems with time-delays (minisymposium). 18th IFAC World Congress, Milano, Italy, August 28-September 2, 2011. [ arXiv ]

[C17] S. Gumussoy and W. Michiels, Continuation Based Computation of Root-Locus for SISO Dead-Time Systems. 9th IFAC Workshop on Time-Delay Systems, 2010. [ arXiv ]

[C16] S. Gumussoy and W. Michiels, Computing H-infinity Norms of Time-Delay Systems. 48th IEEE Conference on Decision and Control, pp. 263-268, 2009. [ arXiv ]

[C15] S. Gumussoy and W. Michiels, Fixed-Order H-infinity Optimization of Time-Delay Systems. 14th Belgian-French-German Conference on Optimization, 2009. [ slides ]

[C14] S. Gumussoy and W. Michiels, Computing the Pseudospectral Abscissa of Time-Delay Systems. 8th IFAC Workshop on Time-Delay Systems, 2009. [ arXiv ]

[C13] S. Gumussoy, D. Henrion, M. Millstone and M. L. Overton, Multiobjective robust control with HIFOO 2.0. 6th IFAC Symposium on Robust Control Design, 2009. [ arXiv ]

[C12] S. Gumussoy and W. Michiels, Computing H-infinity Norms of Time-Delay Systems. 28th Benelux Meeting on Systems and Control, 2009. [ slides ]

[C11] S. Gumussoy, M. Millstone and M. L. Overton, H-infinity Strong Stabilization via HIFOO, a Package for Fixed-Order Controller Design. 47th IEEE Conference on Decision and Control, pp. 4135-4140 , 2008. [ arXiv ]

[C10] S. Gumussoy, M. Millstone and M. L. Overton, Design of Fixed-Order Controllers via Nonsmooth Optimization. SIAM Conference on Optimization, Boston, MA, 2008. [ slides ]

[C9] S. Gumussoy, On the Zeros of Quasi-Polynomials with Single-Delay. American Control Conference, pp. 5282-5286, 2008. [ arXiv ]

[C8] S. Gumussoy and M. L. Overton, Fixed-Order H-Infinity Controller Design via HIFOO, a Specialized Nonsmooth Optimization Package. American Control Conference, pp. 2750-2754, 2008. [ arXiv ]

[C7] S. Gumussoy and H. Ozbay, Sensitivity Minimization by Stable Controllers: An Interpolation Approach for Suboptimal Solutions. 46th IEEE Conference on Decision and Control, pp. 6071-6076, 2007. [ arXiv ]

[C6] S. Gumussoy and H. Ozbay, Sensitivity minimization by stable controllers for a class of unstable time-delay systems. 9th International Conference on Control, Automation, Robotics and Vision, pp. 1-5, 2006. [ arXiv ]

[C5] H. Ozbay and S. Gumussoy, Remarks on H-infinity Controller Design for SISO Plants with Time Delays. 5th IFAC Symposium on Robust Control Design, 2006.

[C4] S. Gumussoy and H. Ozbay, Remarks on Strong Stabilization and Stable H-infinity Controller Design. 43rd IEEE Conference on Decision and Control, vol. 3, pp. 2621-2624, 2004.

[C3] S. Gumussoy and H. Ozbay, On Stable H-infinity Controllers for Time Delay Systems. 16th International Symposium on Mathematical Theory of Network and Systems, 2004.

[C2] M. Saglam, S. Ezercan, S. Gumussoy and H. Ozbay, Controller tuning for active queue management using a parameter space method. 16th International Symposium on Mathematical Theory of Network and Systems, 2004.

[C1] S. Gumussoy and H. Ozbay, Control of Systems with Infinitely Many Unstable Modes and Strong Stabilizing Controllers Achieving a Desired Sensitivity. 15th International Symposium on Mathematical Theory of Network and Systems, pp. 1-10, 2002.

Book

H. Ozbay, S. Gumussoy, K. Kashima and Y. Yamamoto, Frequency Domain Techniques for H-Infinity Control of Distributed Parameter Systems. Advances in Design and Control, SIAM, 2018.

Book Chapters

[BC4] S. Gumussoy and W. Michiels, Tuning an H-Infinity Controller with a Given Order and a Structure for Interconnected Systems with Delays. Low-Complexity Controllers for Time-Delay Systems, Advances in Delays and Dynamics (edited volume), pp. 95-110, Springer, 2014. [ arXiv ]

[BC3] S. Gumussoy and P. Gahinet, Computer Aided Control System Design for Time Delay Systems using MATLAB. Delay Systems, Advances in Delays and Dynamics (edited volume), pp. 257-270, Springer, 2013. [ arXiv ]

[BC2] W. Michiels and S. Gumussoy, Eigenvalue based algorithms and software for the design of fixed-order stabilizing controllers for interconnected systems with time-delays. Delay Systems, Advances in Delays and Dynamics (edited volume), pp. 243-256, Springer, 2013. [ arXiv ]

[BC1] S. Gumussoy and W. Michiels, Fixed-order H-infinity Optimization of Time-Delay Systems. Recent Advances in Optimization and its Applications in Engineering (edited volume), pp. 103-112, Springer, 2010. [ arXiv ]

Others

[Thesis] S. Gumussoy, Optimal H-infinity controller design and strong stabilization for time-delay and MIMO systems. Ph.D. Thesis, Ohio State University, Electrical Engineering, 2004.

[Webinar] S. Gumussoy, Time-Delay Systems: Analysis and Design with MATLAB and Simulink. MathWorks, December 4, 2012.

[Blog] P. Gahinet, S. Gumussoy, E. Korkut and M. Cuenant, Control System Tuning without Guess or Stress. MathWorks, April 3, 2014.