Okyay Kaynak - IEEE Xplore Author Profile

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The coexistence of high-frequency phasor measurement units (PMUs) and conventional SCADA systems raises the challenge of heterogenous-source and multi-rate measurements which significantly degrades the performance of power system dynamic state estimation. In this work, a deep reinforcement learning (DRL) assisted robust cubature Kalman filtering (CKF) scheme is proposed to handle measurements from...Show More
This article addresses the adaptive neural network (NN)-based sliding-mode control (SMC) problem for sampled-data singularly perturbed systems under aperiodic sampling intervals and input dead zone nonlinearities. To accurately characterize the irregularity of sampling intervals, a nonhomogeneous sojourn probability approach is introduced. To accurately characterize the irregularity of sampling in...Show More
In this article, we address the problem of protocol-based sliding mode control for switched systems with multizone probabilistic time-varying delays. To effectively manage the dynamic behavior of stochastic switching systems, a novel switching rule that incorporates both sojourn probability information and sojourn time is proposed. By exploiting the random nature of time-varying transmission delay...Show More
Generative Artificial Intelligence (Generative AI) is transforming the way we live and work. Following several decades of Artificial Narrow Intelligence, Generative AI is signalling a paradigm shift in the intelligence of machines, an increased generalisation capability with increased accessibility and equity for non-technical users. Large Language Models (LLMs) are leading this charge, specifical...Show More
Unmanned aerial manipulators (UAMs) extend the operational reach of unmanned aerial vehicles (UAVs), yet are often limited by the underactuation of traditional UAV platforms, restricting the workspace of their end-effectors. This article introduces an overactuated UAM system comprising a biaxial-tilting thrust-vectoring quadrotor coupled with a serial manipulator. This configuration offers superio...Show More
This article presents a novel compound aerial vehicle configuration called the hybrid quadplane with all-moving wings (HQWAWs), and provides a six-degrees-of-freedom (6-DOF) flight dynamics modeling and nonlinear controller design for this new configuration. Compared to traditional quadrotors, the HQWAW add two wings on left and right sides of the quadrotor. Each wing is a single structure that ca...Show More
In recent years, the soft measurement and state estimation of key parameters of industrial control systems and critical infrastructure have become crucial. The acquisition of dynamometer diagrams for pumping machines holds great significance in monitoring the operational status of drilling industrial control systems. To achieve the accurate inference of dynamometer diagrams from electrical paramet...Show More
To achieve fault diagnosis and prognosis, obtaining adequate and reliable life-cycle data is essential. However, this poses a challenge in current high-reliable Internet of Things (IoT) systems. Fortunately, accelerated degradation testing (ADT) can be employed to overcome this hurdle. Nevertheless, a dependable testing and measuring technique is required to construct an accurate model for ADT. Th...Show More
As industrial cyber-physical systems (ICPS) play an increasingly pivotal role in the new industrial paradigm, their sustainability has become the current research focus. Remaining useful life (RUL) prediction, also known as prognostics, is critically significant for the sustainability of ICPS. The prognostics involve utilizing process monitoring devices within ICPS to acquire real-time operational...Show More
Accelerated degradation testing (ADT) data typically exhibit a time-stress-dependent structure, as well as random uncertainties due to time-varying effects and unit-to-unit variations. Existing ADT models based on Brownian motion with drift have successfully represented the fault/failure-based degradation behavior and random uncertainty by assuming that the drift parameter follows a Gaussian distr...Show More
The intelligent manufacturing system is a complex, large-scale, interconnected system composed of many intelligent agents, and there may be physical or information space couplings between the agents. A distributed monitoring system and optimization control method are proposed to ensure the system completes its tasks safely and efficiently. The distributed monitoring system based on the average con...Show More
This article studies the prescribed-time stabilization problem of a class of uncertain linear systems. With the aid of some properties of a class of parametric Lyapunov equations and time-varying Lyapunov-like functions, time-varying linear smooth observer-based output feedback controllers are designed to achieve the prescribed-time stabilization. The studied uncertain linear systems can include p...Show More
This article proposes a distributed performance recovery method for multiagent systems with actuator faults in noncooperative games. The local agent (player) can only obtain the policy information of neighboring agents through the communication network. The strategies of nonneighbors in the cost function are unknown, and a leader–follower consensus algorithm is introduced to estimate nonneighbors'...Show More
A new load frequency control (LFC) technique for a multiarea steam-hydropower system (MASHPS) with parameter uncertainty is proposed in this research. A second-order sliding mode control (SMC) via double integrated sliding surface is meant to improve MASHPS frequency regulation, tie-line power management, and dependability. This strategy not only increases asymptotic stability and dependability of...Show More
Due to limitations in large-area communication and computation, it can be challenging to apply centralized diagnosis and optimization control design approaches to cascaded systems. This work proposes a distributed diagnosis and optimization control approach, which is realized using data-driven techniques. Specifically, an adaptive observer-based subdiagnosis system design approach is proposed for ...Show More
This article presents an adaptive control strategy for lane-keeping task of automatic steering systems via sliding-mode technique. First, considering the road-vehicle lateral dynamics, a standard single track steering model has been developed for the lane-keeping task. To cope with the time-variant nature of the longitudinal velocity and uncertainty of measurement, a class of interval type-2 fuzzy...Show More
Over the last decade, transfer learning has attracted a great deal of attention as a new learning paradigm, based on which fault diagnosis (FD) approaches have been intensively developed to improve the safety and reliability of modern automation systems. Because of inevitable factors such as the varying work environment, performance degradation of components, and heterogeneity among similar automa...Show More
In the new industrial environment, the safe and reliable operation of Industrial Cyber-Physical Systems (ICPSs) is being threatened by new types of attacks: Attackers carefully tamper with the measurement and control data transmitted over the network, causing the controlled systems to behave abnormally. The essence of such threats is operational safety issues induced by information security issues...Show More
This presentation discusses the profound technological changes that have taken place around us during the last two decades, supported by the new disruptive advances both on the software and the hardware sides. In recent years, to change the whole format of industrial automation, these developments have been taken further, especially in Germany, under the label "Industry 4.0" that has recently evol...Show More
Sensors are ubiquitous in automatized industrial systems. To ensure the safety of the process control, the fault diagnosis and fault-tolerant control of sensors is necessary. This article proposes subspace-aided sensor fault diagnosis and compensation control approaches based on the data-driven stable kernel representation (SKR) and stable image representation (SIR) identified by the process data ...Show More
As an indispensable energy device, 18650 lithium-ion battery has widespread applications in electric vehicles. Remaining useful life (RUL) prediction of lithium-ion battery is critical for the normal operation of electric vehicles. In conventional approaches, the adaptive estimation of model parameters and the detection of capacity regeneration await further research. To adaptively estimate the no...Show More
As a result of informatization and wider use of connected intelligence, modern industry has evolved into being large scale. To overcome the inevitable shortcomings of centralized design in such cases, this article proposes a subspace-aided distributed closed-loop monitoring approach for interconnected systems. It only uses measurement information from local closed-loop subsystems. The residuals of...Show More
Edge computing is an indispensable technology in the Industry 4.0 era. The data are stored at the edge and transmission is prohibited due to concerns about data privacy. Thus, the traditional centralized data-driven modeling methods will face many difficulties and can hardly be used in practice. Federated learning aims to let local nodes learn a global model cooperatively while keeping their data ...Show More
Basic research in Cognitive Informatics (CI) and Cognitive Computing (CC) provides fundamental theories of intelligence science for Autonomous AI (AAI) and cognitive systems. The field of CI and CC has led to general AI technologies triggered by the transdisciplinary advances in brain, intelligence, computer, knowledge, cognitive, robotic, and cybernetic sciences for engineering implementations. T...Show More
Threats of cyberattacks have penetrated from disclosing critical user information to destroying/manipulating industrial control systems. Study on data security during network transmission has raised increasing attention in the systems and control community, which is found very necessary and timely in the context of Industry 4.0. In most existing approaches, the protection of the transmitted data f...Show More