Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO) https://ph03.tci-thaijo.org/index.php/jnao <p><strong>Journal of Nonlinear Analysis and Optimization: Theory &amp; Applications</strong> is a peer-reviewed, open-access international journal, that devotes to the publication of original articles of current interest in every theoretical, computational, and applicational aspect of nonlinear analysis, convex analysis, fixed point theory, and optimization techniques and their applications to science and engineering. All manuscripts are refereed under the same standards as those used by the finest-quality printed mathematical journals. Accepted papers will be published in two issues annually in June and December, free of charge. This journal was conceived as the main scientific publication of the Center of Excellence in Nonlinear Analysis and Optimization, Naresuan University, Thailand.</p> Center of Excellence in Nonlinear Analysis and Optimization, Naresuan University, Phitsanulok 65000 Thailand en-US Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO) 1906-9685 <p>Copyright (c) 2010 Journal of Nonlinear Analysis and Optimization: Theory &amp; Applications</p> <p><img src="https://i.creativecommons.org/l/by-nc-nd/4.0/88x31.png" alt="Creative Commons License" /></p> <p>This work is licensed under aย <a href="https://creativecommons.org/licenses/by-nc-nd/4.0/" rel="license">Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License</a>.</p> FOMITE FACTORS AND SILENT SPREAD: A VSEIQCR STUDY OF VIRAL DISEASES https://ph03.tci-thaijo.org/index.php/jnao/article/view/1981 <p>This study investigated the impact of both detected and undetected viral<br />cases, along with environmental pathogens, on infection transmission dynamics. A<br />VSEIQCR model was formulated and refined to assess the basic reproduction number<br />through the next-generation matrix method. Findings reveal a rapid escalation in viral<br />cases correlating with the rise in undetected cases. The identification and isolation of<br />individuals exposed to and infected by the virus, whether detected or undetected, are<br />deemed imperative for curtailing disease transmission. Additionally, understanding the<br />role of fomites in infection spread is emphasized.This study stands out for its innovative<br />approach, examining the interconnections among vaccination, quarantine, and contaminated<br />strategies within a cohesive research framework, setting a precedent in the field.</p> MOHIT SONI RAJESH KUMAR SHARMA SHIVRAM SHARMA Copyright (c) 2024 Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO) https://creativecommons.org/licenses/by-nc-nd/4.0 2024-12-29 2024-12-29 15 2 43 63 Convergence Behavior of Modified-Bernstein-Kantrovinch-Stancu Operators https://ph03.tci-thaijo.org/index.php/jnao/article/view/2954 <p>The study introduces a Kantrovinch-Stancu type modification of the modified-Bernstein operator, examining its convergence properties for H\"{o}lder's class of functions. It evaluates the rate of convergence through the modulus of continuity and Peetre's K-functional, providing insights into the efficiency of the proposed operators. Additionally, the research establishes a Vornovskaya type asymptotic result and investigates weighted approximation with polynomial growth, shedding light on the behavior of approximations under varying conditions. To illustrate the convergence behavior empirically, the study employs MATLAB software to present numerical examples, offering tangible evidence of the theoretical findings. Through this comprehensive analysis, the study contributes to understanding the performance and applicability of the Kantrovinch-Stancu modification in approximation theory, with implications for various fields relying on function approximation techniques.</p> Susanta Kumar Paikray Smita Sonker Priyanka Moond Bidu Bhusan Jena Copyright (c) 2024 Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO) https://creativecommons.org/licenses/by-nc-nd/4.0 2024-12-29 2024-12-29 15 2 65 74 A comparative study of Laplace decomposition method and Variational iteration method for solving nonlinear integro -differential equations https://ph03.tci-thaijo.org/index.php/jnao/article/view/3039 <p>In this study, we compare the Laplace decomposition approach to the variational iteration method.</p> <p>This research focuses on comparing methodologies to resolve integro-differential equations that are nonlinear.The result show how practical and successful these methods are. &nbsp;We compare the results to four cases to assess the solution's correctness.</p> <p>&nbsp;</p> jyoti bhosale Handibag S.S Copyright (c) 2024 Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO) https://creativecommons.org/licenses/by-nc-nd/4.0 2024-12-29 2024-12-29 15 2 75 85 Generalized $\alpha$-$\psi$-$\varphi$-$F$-contractive mappings in quasi-$b$-metric like spaces https://ph03.tci-thaijo.org/index.php/jnao/article/view/3050 <p>Respected editor,</p> <p>I have submitted a research paper entiled, "Generalized $\alpha$-$\psi$-$\varphi$-$F$-contractive mappings in quasi-$b$-metric like spaces" to your journal. Kindly consider the paper to publish in your journal.&nbsp;</p> Iruthaya Raj Saminathan Geno Kadwin Jacob Mary Jiny D Copyright (c) 2024 Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO) https://creativecommons.org/licenses/by-nc-nd/4.0 2024-12-29 2024-12-29 15 2 87 96 CONVERGENCE THEOREMS FOR OPERATORS WITH PROPERTY (E) IN CAT(0) SPACES https://ph03.tci-thaijo.org/index.php/jnao/article/view/2501 <p>In this paper, we study the convergence of the SP*-iteration<br>to fixed point for operators with property $(E)$ in $CAT(0)$ spaces. Our results improve and extend some recently results in the literature of fixed point theory in $CAT(0)$ spaces.</p> Seyit Temir Copyright (c) 2024 Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO) https://creativecommons.org/licenses/by-nc-nd/4.0 2024-12-29 2024-12-29 15 2 97 109 New applications of the metatheorem in ordered fixed point theory https://ph03.tci-thaijo.org/index.php/jnao/article/view/3520 <p>Our aim in this paper is to and new applications of our long- standing 2023 Metatheorem. In fact, a certain particular form of Metatheorem on fixed point theorems characterizes metric completeness. Moreover, classical theorems due to Banach, Rus-Hicks-Rhoades, Nadler, Covitz-Nadler, Oettli- Thera, Edelstein, Turinici, Taskovic, Khamsi and ourselves are equivalently formulated or improved by applying Metatheorem.</p> Sehie Park Copyright (c) 2025 Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO) https://creativecommons.org/licenses/by-nc-nd/4.0 2024-12-29 2024-12-29 15 2 111 123