Wongvanich, Napasool
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Preferred name
Wongvanich, Napasool
Alternative Name
Wongvanich, N.
Main Affiliation
Email
napasool.wo@kmitl.ac.th
17 results
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Item type:Publication, Local and global stability analysis of dengue disease with vaccination and optimal control(2021-10-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The Effect of Media in Mitigating Epidemic Outbreaks: The Sliding Mode Control Approach(2022-05-01)Ever since the World Health Organization gave the name COVID-19 to the coronavirus pneumonia disease, much of the world has been severely impact by the pandemic socially and economically. In this paper, the mathematical modeling and stability analyses in terms of the susceptible–exposed–infected–removed (SEIR) model with a nonlinear incidence rate, along with media interaction effects, are presented. The sliding mode control methodology is used to design a robust closed loop control of the epidemiological system, where the property of symmetry in the Lyapunov function plays a vital role in achieving the global asymptotic stability in the output. Two policies are considered: the first considers only the governmental interaction, the second considers only the vaccination policy. Numerical simulations of the control algorithms are then evaluated. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Simplified modelling and backstepping control of the long arm agricultural rover(2020-12-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Finite-Time Integral Backstepping Nonsingular Terminal Sliding Mode Control to Synchronize a New Six-Term Chaotic System and Its Circuit Implementation(2023-01-01); ; This work presents the finite-time synchronization of a new six-term chaotic system with only stable equilibria and its circuitry implementation. The chaotic system is designed in such a way that its complex dynamical behavior, including hidden attractors, can be adjusted through only one parameter, whilst allowing transformation to chaotic flows via invariant transformations. A finite-time chaotic synchronizer is designed via a nonsingular terminal integral backstepping sliding mode controller, with reduced theoretical finite-time convergence, and a modified sliding surface, to accommodate analog circuitry implementations. A comparison between the proposed controller against conventional integral backstepping sliding mode controller showed that active synchronization is achieved in finite time. Finally, analog circuitry implementation for both open-loop and closed-loop configurations is realized via commercially available active components such as LF357 and AD633. The descriptive circuitry equations for both configurations are designed to mimic the actual governing control equations for simplicity and ease of circuit troubleshooting. The workability of both configurations was tested in OrCAD PSpice. Results show that the master and slave systems were found to be in synchronization with less than 0.95% maximum errors. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Mathematical modeling and optimal control of the hand foot mouth disease affected by regional residency in Thailand(2021-11-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Event-triggered based composite observer-oriented quantized truncated predictive tracking control for Markovian jump delay systems(2025-06-01); Sakthivel, R.This study encapsulates the multifaceted nature of attaining precise state tracking objectives in Markovian jump delay systems by encompassing a control technique related to delay compensation, fault tolerance, disturbance suppression and mismatch quantization. In brief, a quantized truncated predictive tracking control technique is implemented to achieve enhanced tracking outcomes by attenuating the influence of time-delays and mismatch quantization. Additionally, as a means of preventing transmission burden in the observer channel, an event-triggering-based composite generalized extended state observer is formulated to offer concurrent evaluations of plant states, actuator faults and external disturbances to the control device. Altogether, an event-triggered composite generalized extended state observer-oriented quantized truncated predictive tracking control algorithm is proposed with the objective of obtaining preferential tracking results despite the detrimental aspects. Specifically, by implying delay-dependent Lyapunov–Krasovskii functionals, we delineate the necessities for ensuring the stochastic stability of the specified system, detailed by linear matrix inequalities. Furthermore, the credibility of the examined findings is affirmed through graphical plots of numerical simulations. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Optimal control of the dengue dynamical transmission with vertical transmission(2019-12-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Synchronization of a Seven-Term Chaotic 4D System Using a Simplified Fixed-Time Adaptive Integral Nonsingular Terminal Sliding Mode Control and Its Circuit RealizationThis work presents an adaptive gain fixed-time synchronization of a seven-term hyperchaotic 4D system, along with its analog circuitry realizations. To facilitate a simplistic circuit realization of the closed loop system, the control design process initiates with the design of a novel, simplified fixed-time stability lemma that gives a lower convergence time, while being easier to compute. A nonlinear, fixed-time adaptive-gain nonsingular terminal sliding mode controller was then designed to synchronize the hyperchaotic 4D system. Theoretical analyses successfully achieved fixed-time synchronization, and computer simulations verified the achievement of zero-error convergence across all states within 1 second, irrespective of the initial conditions and even in the presence of significant parameter and disturbance changes. Analog circuitry implementations of the adaptive gain fixed-time chaotic synchronization configuration were realized using commercially available components, for instance, LF357 and AD633. The circuit equations were devised to replicate those used in the controller, with the goal of facilitating troubleshooting by ensuring simplicity. Electronics workability was tested using PSPICE simulation program. The results demonstrated that active synchronization was achieved in fixed time with less than 1% error across the states in the presence of disturbances. Finally, the developed fixed-time chaotic synchronization was applied to a secure communication system. The results indicate that the original and recovered messages exhibit a high degree of similarity to each other after a fixed duration of 1 second. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Global stability of the transmission of hand-foot-mouth disease according to the age structure of the population(2021-01-01); ; This study investigates a transmission model of Hand-Foot-Mouth disease (HFMD) where the age structure of the population is taken into account. Most infections in Thailand occur among children below the age of 10 years, whose immunity to HFMD is lower than people of age greater than 10 years. Therefore, a mathematical model was developed in which the population was separated into two groups with respect to age: one comprised of children aged less than 10 years, and another comprised of the rest of the population. The reproductive number was obtained by the next-generation matrix approach. Global asymptotical stability of the developed model was assured using Lyapunov’s direct method. The model was validated by showing that the 2D and 3D trajectories of the numerical solutions for the different sub-population groups converged to the endemic equilibrium states when the reproduction number was greater than one, thus supporting the theoretical conclusions. Results show that the time series behaviors of the different normalized populations groups converge to the disease-free state when the values of the parameters are such that the basic reproductive number is 0.591481 (i.e., less than one) and to an endemic state when the values of the parameters are such that R<inf>0</inf> = 54.4523 and R<inf>0</inf> = 192.575 R = (i.e. greater than one). The results of this study can suggest ways for reducing the outbreak of this disease. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The Lyapunov Analyses of MERS-Cov Transmission in Thailand(2019-01-01);