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Ramalingam Sakthivel,Ramasamy Kavikumar,Oh-Min Kwon 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
This paper deals with the issue of asynchronous filter design for a class of discrete-time Takagi-Sugeno (T-S) fuzzy systems subject to time-varying delays, external disturbances and cyber attacks. Precisely, the cyber attacks phenomenon in the network environment satisfies the Bernoulli distributed white noise sequences. Firstly, an asynchronous filter is constructed for estimating the unmeasured states of the system and the corresponding fault detection problem is formulated as a resilient filtering issue by which the error between residual and fault is minimized with a mixed H<SUB>∞</SUB> and passivity performance. Secondly, the sufficient criteria are derived to ensure the filtering error system to be asymptotically stable. Finally, the applicability and usefulness of the proposed filter design method is verified through a practical example.
Sakthivel, Rathinasamy,Sakthivel, Ramalingam,Kaviarasan, Boomipalagan,Wang, Chao,Ma, Yong-Ki Hindawi Limited 2018 Complexity Vol.2018 No.-
<P>The problem of robust nonfragile synchronization is investigated in this paper for a class of complex dynamical networks subject to semi-Markov jumping outer coupling, time-varying coupling delay, randomly occurring gain variation, and stochastic noise over a desired finite-time interval. In particular, the network topology is assumed to follow a semi-Markov process such that it may switch from one to another at different instants. In this paper, the random gain variation is represented by a stochastic variable that is assumed to satisfy the Bernoulli distribution with white sequences. Based on these hypotheses and the Lyapunov-Krasovskii stability theory, a new finite-time stochastic synchronization criterion is established for the considered network in terms of linear matrix inequalities. Moreover, the control design parameters that guarantee the required criterion are computed by solving a set of linear matrix inequality constraints. An illustrative example is finally given to show the effectiveness and advantages of the developed analytical results.</P>
Finite-time boundedness and extended passive analysis for fuzzy Markov jump systems with saturation
Ramasamy Kavikumar,Ramalingam Sakthivel,Oh-Min Kwon 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
In this work, the problem of extended passive-based finite-time control is studied for Takagi–Sugeno fuzzy Markov jump systems with actuator saturation over a finite horizon. The focus is on the design of a mode-dependent nonfragile controller such that the resulting closed-loop system is stochastically finite-time bounded and extended passively. Specifically, by using the mode-dependent Lyapunov-Krasovskii functional technique and Abel lemma-based finite sum inequality, a sufficient condition is established to ensure the finite-time bounded of the addressed systems. Finally, the feasibility and effectiveness of the proposed design are verified and demonstrated by a simulation example.
Arjun Kumar B.,Ramalingam Gopal,Al Omari Salah Addin Burhan,Nallabala Nanda Kumar Reddy,Sakthivel P.,Kabeer Saifudeen,Sangaraju Sambasivam 한국탄소학회 2024 Carbon Letters Vol.34 No.3
Herein, the present work focuses on the effective counter electrode for dye-sensitized solar cells. The bottom–up approach was adapted to synthesize Mn2O3 nanorods via the hydrothermal method and the reduced graphene oxide was merged with Mn2O3 to prepare a nanocomposite. The prepared nanocomposites were subjected to physio-chemical and morphological characterizations which revealed the crystalline nature of Mn2O3 nanorods. The purity level rGO was characterized using the Raman spectrum and the Fourier transform infrared spectroscopy employed to find the functional groups. The morphological micrographs were visualized using SEM and TEM and the high aspect ratio Mn2O3 nanorods were observed with 5–7 nm and supported by rGO sheets. The electrocatalytic nature and corrosion properties of the counter electrode towards the iodide electrolyte were studied using a symmetrical cell. The as-synthesized nanocomposites were introduced as counter electrodes for DSSC and produced 4.11% of photoconversion efficiency with lower charge transfer resistance. The fabricated DSSC devices were undergone for stability tests for indoor and outdoor atmospheres, the DSSC stability showed 93% and 80% respectively for 150 days.