권호 표지

Journal of applied mathematics & informatics

The Korean Society for Computational and Applied Mathematics (KSCAM)

  • 연3회간
  • /
  • 2734-1194(pISSN)
  • /
  • 2234-8417(eISSN)

Domain

  • Mathematics ＞ Applied Mathematics

Aim & Scope

This is a broad based journal covering all branches of computational or applied mathematics with special encouragement to researchers in theoretical computer science and mathematical Informatics. Thus, the major areas, such as Numerical Analysis, Discrete Optimization, Linear and Nonlinear Programming, Theory of Computation(Computational Complexity, Automata and Formal Languages), Control Theory, Theory of Algorithms, Computational Logic, Applied Combinatorics (including graphs, codes, and designs), Coding Theory, Cryptographics, Big data, AI, Fuzzy Theory with applications, Differential Equations with applications, etc., are all included. A large variety of scientific problems also necessarily involve Algebra, Analysis, Geometry, Probability and Statistics, and so on. The journal welcomes research papers in all branches of mathematics which have some bearing on the application to scientific problems, including papers in the areas of Actuarial Science, Mathematical Biology, Mathematical Economics and Finance.

KSCI KCI SCOPUS

Volume 39 Issue 3_4

  1. SWAMINATHAN, A.;SIVARAJA, S. 251
    https://doi.org/10.14317/jami.2021.251 PDF KSCI
    This article is devoted to introduce the notion of fuzzy cleanly covered fuzzy topological spaces; in addition two strong fuzzy separation axioms are studied. By means of fuzzy maximal open sets some properties of fuzzy cleanly covered fuzzy topological spaces are obtained and also by means of fuzzy maximal closed sets few identical results of a fuzzy topological spaces are investigated. Through fuzzy minimal open and fuzzy maximal closed sets, two strong fuzzy separation axioms are discussed.
  2. BAEK, HYUNG TAE;LIM, JUNG WOOK 259
    https://doi.org/10.14317/jami.2021.259 PDF KSCI
    Let R be a commutative ring with identity and let S be a nonempty subset of R. We define S to be an almost multiplicative subset of R if for each a, b ∈ S, there exist integers m, n ≥ 1 such that ambn ∈ S. In this article, we study some utilization of almost multiplicative subsets.
  3. BICER, EMEL 267
    https://doi.org/10.14317/jami.2021.267 PDF KSCI
    In this study, we investigate the generalized Hyers-Ulam Stability of partial differential equation of the form yt - kyxx = 0.
  4. DUNDAR, ERDINC;TALO, OZER 277
    https://doi.org/10.14317/jami.2021.277 PDF KSCI
    In this paper, we introduce the notions of Wijsman regularly invariant convergence types, Wijsman regularly (${\mathcal{I}}_{\sigma}$, ${\mathcal{I}}^{\sigma}_2$)-convergence, Wijsman regularly (${\mathcal{I}}^*_{\sigma}$, ${\mathcal{I}}^{{\sigma}*}_2$)-convergence, Wijsman regularly (${\mathcal{I}}_{\sigma}$, ${\mathcal{I}}^{\sigma}_2$) -Cauchy double sequence and Wijsman regularly (${\mathcal{I}}^*_{\sigma}$, ${\mathcal{I}}^{{\sigma}*}_2$)-Cauchy double sequence of sets. Also, we investigate the relationships among this new notions.
  5. RYOO, CHEON SEOUNG 295
    https://doi.org/10.14317/jami.2021.295 PDF KSCI
    In this paper, we propose a new iterative algorithm to automatically prove the existence of solutions for a unilateral boundary value problems for second order equations.
  6. GULLE, ESRA;ULUSU, UGUR 303
    https://doi.org/10.14317/jami.2021.303 PDF KSCI
    In this paper, we introduce the concepts of Wijsman strongly p-lacunary summability of order 𝛼, Wijsman lacunary statistical convergence of order 𝛼 and Hausdorff lacunary statistical convergence of order 𝛼 for double set sequences. Also, we investigate some properties of these new concepts and examine the existence of some relationships between them. Furthermore, we study the relationships between these new concepts and some concepts in the literature.
  7. OZARSLAN, HIKMET SEYHAN 321
    https://doi.org/10.14317/jami.2021.321 PDF KSCI
    In the present paper, a theorem on 𝜑 - | C, 𝛼; 𝛿 |k summability of an infinite series is obtained by using a quasi 𝛽-power increasing sequence.
  8. JEONG, IMSOON;WOO, CHANGHWA 327
    https://doi.org/10.14317/jami.2021.327 PDF KSCI
    In this paper, we have introduced a new notion of recurrent structure Jacobi of real hypersurfaces in complex hyperbolic two-plane Grassmannians G*2(ℂm+2). Next, we show a non-existence property of real hypersurfaces in G*2(ℂm+2) satisfying such a curvature condition.
  9. DU, JIANWEI;SUN, XIAOLING 339
    https://doi.org/10.14317/jami.2021.339 PDF KSCI
    Zagreb indices and their modified versions of a molecular graph are important descriptors which can be used to characterize the structural properties of organic molecules from different aspects. In this work, we investigate some properties of the modified second multiplicative Zagreb index of graphs with given connectivity. In particular, we obtain the maximum values of the modified second multiplicative Zagreb index with fixed number of cut edges, or cut vertices, or edge connectivity, or vertex connectivity of graphs. Furthermore, we characterize the corresponding extremal graphs.
  10. SO, JI SUK;HWANG, JIHYUN;KIM, DAEYEOUL 359
    https://doi.org/10.14317/jami.2021.359 PDF KSCI
    The main purpose and motivation of this work is to investigate and provide some new results for coefficients derived from eta quotients related to 3. The result of this paper involve some restricted divisor numbers and their convolution sums. Also, our results give relation between the coefficients derived from infinite product, infinite sum and the convolution sum of restricted divisor functions.
  11. KARA, MERVE;YAZLIK, YASIN;TOUAFEK, NOURESSADAT;AKROUR, YOUSSOUF 381
    https://doi.org/10.14317/jami.2021.381 PDF KSCI
    Consider the three-dimensional system of difference equations $x_{n+1}=\frac{{\prod_{j=0}^{k}}z_n-3j}{{\prod_{j=1}^{k}}x_n-(3j-1)\;\(a_n+b_n{\prod_{j=0}^{k}}z_n-3j\)}$, $y_{n+1}=\frac{{\prod_{j=0}^{k}}x_n-3j}{{\prod_{j=1}^{k}}y_n-(3j-1)\;\(c_n+d_n{\prod_{j=0}^{k}}x_n-3j\)}$, $z_{n+1}=\frac{{\prod_{j=0}^{k}}y_n-3j}{{\prod_{j=1}^{k}}z_n-(3j-1)\;\(e_n+f_n{\prod_{j=0}^{k}}y_n-3j\)}$, n ∈ ℕ0, where k ∈ ℕ0, the sequences $(a_n)_{n{\in}{\mathbb{N}}_0$, $(b_n)_{n{\in}{\mathbb{N}}_0$, $(c_n)_{n{\in}{\mathbb{N}}_0$, $(d_n)_{n{\in}{\mathbb{N}}_0$, $(e_n)_{n{\in}{\mathbb{N}}_0$, $(f_n)_{n{\in}{\mathbb{N}}_0$ and the initial values x-3k, x-3k+1, …, x0, y-3k, y-3k+1, …, y0, z-3k, z-3k+1, …, z0 are real numbers. In this work, we give explicit formulas for the well defined solutions of the above system. Also, the forbidden set of solution of the system is found. For the constant case, a result on the existence of periodic solutions is provided and the asymptotic behavior of the solutions is investigated in detail.
  12. JANG, DOUK SOO 405
    https://doi.org/10.14317/jami.2021.405 PDF KSCI
    The aim of this paper is to provide the residues of Euler polynomials modulo p2 in terms of alternating sums of like powers of numbers in arithmetical progression. Also, we establish the analogue of a classical congruence of Lehmer.
  13. ANGASU, MERGA AMARA;DURESSA, GEMECHIS FILE;WOLDAREGAY, MESFIN MEKURIA 419
    https://doi.org/10.14317/jami.2021.419 PDF KSCI
    This paper deals with numerical treatment of singularly perturbed differential equations involving small delays. The highest order derivative in the equation is multiplied by a perturbation parameter 𝜀 taking arbitrary values in the interval (0, 1]. For small 𝜀, the problem involves a boundary layer of width O(𝜀), where the solution changes by a finite value, while its derivative grows unboundedly as 𝜀 tends to zero. The considered problem contains delay on the convection and reaction terms. The terms with the delays are approximated using Taylor series approximations resulting to asymptotically equivalent singularly perturbed BVPs. Inducing exponential fitting factor for the term containing the singular perturbation parameter and using central finite difference for the derivative terms, numerical scheme is developed. The stability and uniform convergence of difference schemes are studied. Using a priori estimates we show the convergence of the scheme in maximum norm. The scheme converges with second order of convergence for the case 𝜀 = O(N-1) and for the case 𝜀 ≪ N-1, the scheme converge uniformly with first order of convergence, where N is number of mesh intervals in the domain discretization. We compare the accuracy of the developed scheme with the results in the literature. It is found that the proposed scheme gives accurate result than the one in the literatures.
  14. RHEE, HYANG JOO 437
    https://doi.org/10.14317/jami.2021.437 PDF KSCI
    In this paper, we study the characterizations of two-sided best simultaneous approximations for ℓ-tuple subset from a closed convex subset of ℝm with ℓm1(w)-norm. Main fact is, k* is a two-sided best simultaneous approximation to F from K if and only if there exist f1, …, fp in F, for any k ∈ K $${\mid}{\sum\limits_{i=1}^{m}}sgn(f_{ji}-k^*_i)k_iw_i{\mid}{\leq}\;{\sum\limits_{i{\in}Z(f_j-k^*)}}\;{\mid}k_i{\mid}w_i$$ for each j = 1, …, p and 𝐰 ∈ W.
  15. DONG, YANWU;ZHENG, GUIJUN;LI, CHUNJI 443
    https://doi.org/10.14317/jami.2021.443 PDF KSCI
    In this paper, we discuss the backward extensions of Bergman shifts Wα(m), where $${\alpha}(m)\;:\;\sqrt{\frac{m}{m+1}},\;{\sqrt{\frac{m+1}{m+2}}},\;{\cdots},\;(m{\in}\mathbb{N})$$. We obtained a complete description of the n-hynonormality for backward one, two and three step extensions.
  16. CHOI, JI EUN;KIM, AHYUN 455
    https://doi.org/10.14317/jami.2021.455 PDF KSCI
    In this paper, we define twisted q-Euler polynomials of the second kind and explore some properties. We find generating function of twisted q-Euler polynomials of the second kind. Also, we investigate twisted q-Raabe's multiplication formula and (w, q)-alternating power sums of twisted q-Euler polynomials of the second kind. At the end, we define twisted q-Hurwitz's type Euler zeta function of the second kind.
  17. NOOR, MUHAMMAD ASLAM;NOOR, KHALIDA INAYAT 469
    https://doi.org/10.14317/jami.2021.469 PDF KSCI
    In this paper, some new classes of the higher order strongly exponentially preinvex functions are introduced. New relationships among various concepts of higher order strongly exponentially preinvex functions are established. It is shown that the optimality conditions of differentiable higher order strongly exponentially preinvex functions can be characterized by exponentially variational-like inequalities. Parallelogram laws for Banach spaces are obtained as an application. As special cases, one can obtain various new and known results from our results. Results obtained in this paper can be viewed as refinement and improvement of previously known results.
  18. YOO, JONG-KWANG 487
    https://doi.org/10.14317/jami.2021.487 PDF KSCI
    In this paper we show that if A ∈ L(X) and B ∈ L(Y), X and Y complex Banach spaces, then A ⊕ B ∈ L(X ⊕ Y) is subscalar if and only if both A and B are subscalar. We also prove that if A, Q ∈ L(X) satisfies AQ = QA and Qp = 0 for some nonnegative integer p, then A has property (C) (resp. property (𝛽)) if and only if so does A + Q (resp. property (𝛽)). Finally, we show that A ∈ L(X, Y) and B, C ∈ L(Y, X) satisfying operator equation ABA = ACA and BA ∈ L(X) is subscalar with property (𝛿) then both Lat(BA) and Lat(AC) are non-trivial.
  19. PONRAJ, R.;SUBBULAKSHMI, S.;SOMASUNDARAM, S. 497
    https://doi.org/10.14317/jami.2021.497 PDF KSCI
    Let G be a graph. Let f : V (G) → {0, 1, …, k - 1} be a function where k ∈ ℕ and k > 1. For each edge uv, assign the label $f(uv)={\lceil}{\frac{f(u)+f(v)}{2}}{\rceil}$. f is called k-total mean cordial labeling of G if ${\mid}t_{mf}(i)-t_{mf}(j){\mid}{\leq}1$, for all i, j ∈ {0, 1, …, k - 1}, where tmf (x) denotes the total number of vertices and edges labelled with x, x ∈ {0, 1, …, k-1}. A graph with admit a k-total mean cordial labeling is called k-total mean cordial graph.
  20. KWUN, YOUNG CHEL;KIM, JEONG SOON;PARK, YOUNG IL;PARK, JIN HAN 507
    https://doi.org/10.14317/jami.2021.507 PDF KSCI
    In this paper, we study existence of extremal solutions for fuzzy differential equations driven by Liu process. To show extremal solutions, we define partial ordering relative to fuzzy process. This is an extension of the results of Kwun et al. [5] and Rodríguez-López [13] to fuzzy differential equations in credibility space.
  21. HAMAIZIA, TAIEB 529
    https://doi.org/10.14317/jami.2021.529 PDF KSCI
    The purpose of this paper is to prove some fixed point theorems using (𝜓, 𝜑)-contractions via the concept of C-class functions in Gb-metric spaces. Moreover, an example is presented to illustrate the validity of our results.
  22. KANG, JUNG YOOG 541
    https://doi.org/10.14317/jami.2021.541 PDF KSCI
    In this paper, we introduce q-sigmoid polynomials combining q-cosine function. We find several properties and identities of these polynomials which are related to sigmoid function using deep learning.
  23. ALEMAYEHU, TEFERI GETACHEW;WONDIFRAW, YOHANNES GEDAMU 553
    https://doi.org/10.14317/jami.2021.553 PDF KSCI
    In this paper, we introduce concepts of MS-fuzzy ideals of MS-algebras. We reveal the connections between MS-fuzzy ideals and several kinds of fuzzy ideals as fuzzy prime ideals, kernel fuzzy ideals, e-fuzzy ideals and closure fuzzy ideals. We show that many of these classes are proper subclasses of the class of MS-fuzzy ideals. Finally some properties of the homomorphic images, inverse homomorphic images of MS-fuzzy ideals are studied.
  24. NORAHUN, WONDWOSEN ZEMENE;ZELEKE, YOHANNES NIGATIE 569
    https://doi.org/10.14317/jami.2021.569 PDF KSCI
    In this paper, we introduce the concept of relative co-fuzzy annihilator filters in distributive lattices. We give a set of equivalent conditions for a co-fuzzy annihilator to be a fuzzy filter and we characterize distributive lattices with the help of co-fuzzy annihilator filters. Furthermore, using the concept of relative co-fuzzy annihilators, we prove that the class of fuzzy filters of distributive lattices forms a Heyting algebra. We also study co-fuzzy annihilator filters. It is proved that the set of all co-fuzzy annihilator filters forms a complete Boolean algebra.
  25. QI, MENG;SHAO, XINHUI 587
    https://doi.org/10.14317/jami.2021.587 PDF KSCI
    Some problems in engineering and science can be equivalently transformed into solving multi-linear systems. In this paper, we propose two preconditioned AOR iteration methods to solve multi-linear systems with -tensor. Based on these methods, the general conditions of preconditioners are given. We give the convergence theorem and comparison theorem of the two methods. The results of numerical examples show that methods we propose are more effective.