Kasamsuk Ungchittrakool

Dr. Kasamsuk Ungchittrakool


Research Focus & Metrics

Academic Career Length

17Years (2010-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications

6 May 2020 in Symmetry
Verified
Journal Article
Open access
PDF file
NANatthaphon Artsawang
Natthaphon Artsawang
KUKasamsuk Ungchittrakool
Kasamsuk Ungchittrakool
In this article, we establish a new Mann-type method combining both inertial terms and errors to find a fixed point of a nonexpansive mapping in a Hilbert space. We show strong convergence of the iterate under some appropriate assumptions in order to find a solution to an investigative fixed point problem. For the virtue of the main theorem, it can be applied to an approximately zero point of the sum of three monotone operators. We compare the convergent performance of our proposed method, the Mann-type algorithm without both inertial terms and errors, and the Halpern-type algorithm in convex minimization problem with the constraint of a non-zero asymmetric linear transformation. Finally, we illustrate the functionality of the algorithm through numerical experiments addressing image restoration problems.

29 June 2023 in Mathematics
Verified
Journal Article
Open access
PDF file
KUKasamsuk Ungchittrakool
Kasamsuk Ungchittrakool
SPSomyot Plubtieng
Somyot Plubtieng
NANatthaphon Artsawang
Natthaphon Artsawang
PTPurit Thammasiri
Purit Thammasiri
In this paper, we introduce and study a modified Mann-type algorithm that combines inertial terms for solving common fixed point problems of two countable families of nonexpansive mappings in Hilbert spaces. Under appropriate assumptions on the sequences of parameters, we establish a strong convergence result for the sequence generated by the proposed method in finding a common fixed point of two countable families of nonexpansive mappings. This method can be applied to solve the monotone inclusion problem. Additionally, we employ a modified Mann-type iterative algorithm to address image restoration problems. Furthermore, we present numerical results across different scenarios to demonstrate the superior efficiency of our algorithm compared to existing algorithms.

28 March 2024 in Carpathian Journal of Mathematics
Verified
Journal Article
Closed access
NANatthaphon Artsawang
Natthaphon Artsawang
SPSomyot Plubtieng
Somyot Plubtieng
OBOvidiu Bagdasar
Ovidiu Bagdasar
KUKasamsuk Ungchittrakool
Kasamsuk Ungchittrakool
SBSuparat Baiya
Suparat Baiya
PTPurit Thammasiri
Purit Thammasiri
In this work, we propose and study an inertial Krasnosel’ski˘ı-Mann iterative algorithm with step-size parameters involving nonexpansive mapping to find a solution of a fixed point problem of a nonex- pansive mapping in the frame work of Hilbert spaces. Strong convergence of the new proposed algorithm is proved under some useful properties of a nonexpansive mapping and inequalities on real Hilbert spaces to- gether with the appropriate conditions of scalar controls without relying on the concept of viscosity methods. For the applications, we employ the obtained results to find a zero point of some monotone inclusion problems and then apply to solve image restoration problems. For representing the advantage of the new algorithm, the signal to noise ratio (SNR) with various types of blurring operators and some numerical experiments are pre- sented to compare and illustrate the behavior of the new algorithm with numerical results of some previous existing algorithms.

7 October 2024 in Mathematics
Verified
Journal Article
Open access
PDF file
PTPurit Thammasiri
Purit Thammasiri
VBVasile Berinde
Vasile Berinde
NPNarin Petrot
Narin Petrot
KUKasamsuk Ungchittrakool
Kasamsuk Ungchittrakool
In this research paper, we present a novel theoretical technique, referred to as the double Tseng’s algorithm with inertial terms, for finding a common solution to two monotone inclusion problems. Developing the double Tseng’s algorithm in this manner not only comprehensively expands theoretical knowledge in this field but also provides advantages in terms of step-size parameters, which are beneficial for tuning applications and positively impact the numerical results. This new technique can be effectively applied to solve the problem of image deblurring and offers numerical advantages compared to some previously related results. By utilizing certain properties of a Lipschitz monotone operator and a maximally monotone operator, along with the identity associated with the convexity of the quadratic norm in the framework of Hilbert spaces, and by imposing some constraints on the scalar control conditions, we can achieve weak convergence to a common zero point of the sum of two monotone operators. To demonstrate the benefits and advantages of this newly proposed algorithm, we performed numerical experiments to measure the improvement in the signal–to–noise ratio (ISNR) and the structural similarity index measure (SSIM). The results of both numerical experiments (ISNR and SSIM) demonstrate that our new algorithm is more efficient and has a significant advantage over the relevant preceding algorithms.

1 March 2020 in Carpathian Journal of Mathematics
Verified
Journal Article
Open access
JMJiraprapa Munkong
Jiraprapa Munkong
BDBui VAN Dinh
Bui VAN Dinh
KUKasamsuk Ungchittrakool
Kasamsuk Ungchittrakool
In this paper, we propose an algorithm with two inertial term extrapolation steps for solving bilevel equilibrium problem in a real Hilbert space. The inertial term extrapolation step is introduced to speed up the rate of convergence of the iteration process. Under some sufficient assumptions on the bifunctions involving pseudomonotone and Lipschitz-type conditions, we obtain the strong convergence of the iterative sequence generated by the proposed algorithm. A numerical experiment is performed to illustrate the numerical behavior of the algorithm and also comparison with some other related algorithms in the literature.