129 citations · 671 across the 46 of their papers we have counts for
46 papers
Learning Emergence of Interaction Patterns across Independent RL Agents in Multi-Agent Environments
Vasanth Reddy Baddam, Suat Gumussoy, Almuatazbellah Boker +1
Many real-world problems, such as controlling swarms of drones and urban traffic, naturally lend themselves to modeling as multi-agent reinforcement learning (RL) problems. However…
Grouping of Contingencies for Controller Synthesis: A Study for Power Line Failures
Neelay Junnarkar, Emily Jensen, Xiaofan Wu +2
The problem of maintaining power system stability and performance after the failure of any single line in a power system (an "N-1 contingency") is investigated. Due to the large nu…
Certifying Stability and Performance of Uncertain Differential-Algebraic Systems: A Dissipativity Framework
Emily Jensen, Neelay Junnarkar, Murat Arcak +2
This paper presents a novel framework for characterizing dissipativity of uncertain systems whose dynamics evolve according to differential-algebraic equations. Sufficient conditio…
SSD -- Software for Systems with Delays: Reproducible Examples and Benchmarks on Model Reduction and H2 Norm Computation
Suat Gumussoy
We present SSD, Software for Systems with Delays, a de novo MATLAB package for the analysis and model reduction of retarded time delay systems (RTDS). Underneath, our delay system…
PD-MORL: Preference-Driven Multi-Objective Reinforcement Learning Algorithm
Toygun Basaklar, Suat Gumussoy, Umit Y. Ogras
Multi-objective reinforcement learning (MORL) approaches have emerged to tackle many real-world problems with multiple conflicting objectives by maximizing a joint objective functi…
Hypervector Design for Efficient Hyperdimensional Computing on Edge Devices
Toygun Basaklar, Yigit Tuncel, Shruti Yadav Narayana +2
Hyperdimensional computing (HDC) has emerged as a new light-weight learning algorithm with smaller computation and energy requirements compared to conventional techniques. In HDC,…
Transfer Learning for Human Activity Recognition using Representational Analysis of Neural Networks
Sizhe An, Ganapati Bhat, Suat Gumussoy +1
Human activity recognition (HAR) research has increased in recent years due to its applications in mobile health monitoring, activity recognition, and patient rehabilitation. The t…
Tuning an H-Infinity Controller with a Given Order and a Structure for Interconnected Systems with Delays
Suat Gumussoy, Wim Michiels
An eigenvalue based framework is developed for the H-infinity norm analysis and its norm minimization of coupled systems with time-delays, which are naturally described by delay di…
An Online Learning Methodology for Performance Modeling of Graphics Processors
Ujjwal Gupta, Manoj Babu, Raid Ayoub +4
Approximately 18 percent of the 3.2 million smartphone applications rely on integrated graphics processing units (GPUs) to achieve competitive performance. Graphics performance, ty…
Analysis and Control of Power-Temperature Dynamics in Heterogeneous Multiprocessors
Ganapati Bhat, Suat Gumussoy, Umit Y. Ogras
Virtually all electronic systems try to optimize a fundamental trade-off between higher performance and lower power consumption. The latter becomes critical in mobile computing sys…
Fixed-Order H-infinity Optimization of Time-Delay Systems
Suat Gumussoy, Wim Michiels
H-infinity controllers are frequently used in control theory due to their robust performance and stabilization. Classical H-infinity controller synthesis methods for finite dimensi…
Eigenvalue based algorithms and software for the design of fixed-order stabilizing controllers for interconnected systems with time-delays
Wim Michiels, Suat Gumussoy
An eigenvalue based framework is developed for the stability analysis and stabilization of coupled systems with time-delays, which are naturally described by delay differential alg…
Computer Aided Control System Design for Time Delay Systems using MATLAB
Suat Gumussoy, Pascal Gahinet
Computer Aided Control System Design (CACSD) allows to analyze complex interconnected systems and design controllers achieving challenging control requirements. We extend CACSD to…
Computation of Extremum Singular Values and the Strong H-infinity Norm of SISO Time-Delay Systems
Suat Gumussoy, Wim Michiels
We consider the computation of H-infinity norms for Single-Input-Single-Output (SISO) time-delay systems, which are described by delay differential algebraic equations. Unlike the…
Coprime Inner/Outer Factorization of SISO Time-Delay Systems and FIR Structure of Their Optimal H-Infinity Controllers
Suat Gumussoy
The approach in Foias et al. (1996) is one of the well-developed methods to design H-infinity controllers for general infinite dimensional systems. This approach is applicable if t…
Root Locus for SISO Dead-Time Systems: A Continuation Based Approach
Suat Gumussoy, Wim Michiels
We present a numerical method to plot the root locus of Single-Input-Single-Output (SISO) dead-time systems with respect to the controller gain or the system delay. We compute the…
Fixed-order H-infinity control for interconnected systems using delay differential algebraic equations
Suat Gumussoy, Wim Michiels
We analyze and design H-infinity controllers for general time-delay systems with time-delays in systems' state, inputs and outputs. We allow the designer to choose the order of the…
Relative Stability Analysis of Closed-Loop SISO Dead-Time Systems: non-imaginary axis case
Suat Gumussoy
We present a numerical method to analyze the relative stability of closed-loop single-input-single-output (SISO) dead-time systems on a given left complex half-plane for all positi…
Sensitivity Minimization by Strongly Stabilizing Controllers for a Class of Unstable Time-Delay Systems
Suat Gumussoy, Hitay Ozbay
Weighted sensitivity minimization is studied within the framework of strongly stabilizing (stable) H-infinity controller design for a class of infinite dimensional systems. This pr…
A Predictor-Corrector Type Algorithm for the Pseudospectral Abscissa Computation of Time-Delay Systems
Suat Gumussoy, Wim Michiels
The pseudospectrum of a linear time-invariant system is the set in the complex plane consisting of all the roots of the characteristic equation when the system matrices are subject…
Characterization and computation of H-infinity norms for time-delay systems
Wim Michiels, Suat Gumussoy
We consider the characterization and computation of H-infinity norms for a class of time-delay systems. It is well known that in the finite dimensional case the H-infinity norm of…
Stable H-infinity controller design for time-delay systems
Suat Gumussoy, Hitay Ozbay
This paper investigates stable suboptimal H-infinity controllers for a class of single-input single-output time-delay systems. For a given plant and weighting functions, the optima…
Improving Linear State-Space Models with Additional Iterations
Suat Gumussoy, Ahmet Arda Ozdemir, Tomas McKelvey +3
An estimated state-space model can possibly be improved by further iterations with estimation data. This contribution specifically studies if models obtained by subspace estimation…
Transfer Function Estimation in System Identification Toolbox via Vector Fitting
Ahmet Arda Ozdemir, Suat Gumussoy
This paper considers black- and grey-box continuous-time transfer function estimation from frequency response measurements. The first contribution is a bilinear mapping of the orig…