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 38 Issue 1_2

  1. ABO-ZEID, R. 1
    https://doi.org/10.14317/jami.2020.001 PDF KSCI
    In this paper, we solve the difference equation $x_{n+1}={\frac{x_nx_{n-2}}{ax_n-bx_{n-2}}}$, n = 0, 1, …, where a and b are positive real numbers and the initial values x-2, x-1 and x0 are real numbers. We also find invariant sets and discuss the global behavior of the solutions of aforementioned equation.
  2. PAL, D.;MAHAPATRA, G.S.;MAHATO, S.K.;SAMANTA, G.P. 13
    https://doi.org/10.14317/jami.2020.013 PDF KSCI
    In this paper, we have presented a multispecies prey-predator harvesting system based on Lotka-Voltera model with two competing species which are affected not only by harvesting but also by the presence of a predator, the third species. We also assume that the two competing fish species releases a toxic substance to each other. We derive the condition for global stability of the system using a suitable Lyapunov function. The possibility of existence of bionomic equilibrium is considered. The optimal harvest policy is studied and the solution is derived under imprecise inflation in fuzzy environment using Pontryagin's maximal principle. Finally some numerical examples are discussed to illustrate the model.
  3. KANG, J.Y. 37
    https://doi.org/10.14317/jami.2020.037 PDF KSCI
    In this paper we discuss some interesting properties of (p, q)-special polynomials and derive various relations. We gain some relations between (p, q)-zeta function and (p, q)-special polynomials by considering (p, q)-analogue Euler sum types. In addition, we derive the relationship between (p, q)-polylogarithm function and (p, q)-special polynomials.
  4. KIM, DONG KYU;LIM, JUNG WOOK 57
    https://doi.org/10.14317/jami.2020.057 PDF KSCI
    Let R ⊆ T be an ascending chain of commutative rings with identity and H(R, T) (resp., h(R, T)) the composite Hurwitz series ring (resp., composite Hurwitz polynomial ring). In this article, we give some conditions for the rings H(R, T) and h(R, T) to be PS-rings.
  5. MOUSSAEI, HOSSEIN;HARIZAVI, HABIB 65
    https://doi.org/10.14317/jami.2020.065 PDF KSCI
    In this paper, for any non-empty subsets A, I of a pseudo BCI-algebra X, we introduce the concept of pseudo p-closure of A with respect to I, denoted by ApcI, and investigate some related properties. Applying this concept, we state a necessary and sufficient condition for a pseudo BCI-algebra 1) to be a p-semisimple pseudo BCI-algebra; 2) to be a pseudo BCK-algebra. Moreover, we show that Apc{0} is the least positive pseudo ideal of X containing A, and characterize it by the union of some branches. We also show that the set of all pseudo ideals of X which ApcI = A, is a complete lattice. Finally, we prove that this notion can be used to define a closure operation.
  6. KO, JUNG MI;KIM, YONG CHAN 79
    https://doi.org/10.14317/jami.2020.079 PDF KSCI
    We introduce the concepts of fuzzy join-complete lattices and Alexandrov L-pre-topologies in complete residuated lattices. We investigate the properties of fuzzy join-complete lattices on Alexandrov L-pre-topologies and fuzzy meet-complete lattices on Alexandrov L-pre-cotopologies. Moreover, we give their examples.
  7. LEE, MIN-YOUNG 91
    https://doi.org/10.14317/jami.2020.091 PDF KSCI
    Presented in this paper is a characterization of Weibull distribution by an independence property of upper record values that Xk has a Weibull distribution if and only if ${\frac{X_U(m)}{X_U(n)}}$ and XU(s) are independent for 1 ≤ m < n < s.
  8. UYGUN, SUKRAN;AYTAR, HULYA 99
    https://doi.org/10.14317/jami.2020.099 PDF KSCI
    The study is about the bounds of the spectral norms of r-circulant and geometric circulant matrices with the sequences called biperiodic Jacobsthal numbers. Then we give bounds for the spectral norms of Kronecker and Hadamard products of these r-circulant matrices and geometric circulant matrices. The eigenvalues and determinant of r-circulant matrices with the bi-periodic Jacobsthal numbers are obtained.
  9. MELESSE, WONDWOSEN GEBEYAW;TIRUNEH, AWOKE ANDARGIE;DERESE, GETACHEW ADAMU 113
    https://doi.org/10.14317/jami.2020.113 PDF KSCI
    In this paper, a class of linear second order singularly perturbed delay differential turning point problems containing a small delay (or negative shift) on the reaction term and when the solution of the problem exhibits twin boundary layers are examined. A hybrid finite difference scheme on an appropriate piecewise-uniform Shishkin mesh is constructed to discretize the problem. We proved that the method is almost second order ε-uniformly convergent in the maximum norm. Numerical experiments are considered to illustrate the theoretical results.
  10. KIM, A HYUN 133
    https://doi.org/10.14317/jami.2020.133 PDF KSCI
    In this paper, we discuss generalized q-poly-Euler numbers and polynomials. To do so, we define generalized q-poly-Euler polynomials with variable a and investigate its identities. We also represent generalized q-poly-Euler polynomials E(k)n,q(x; a) using Stirling numbers of the second kind. So we explore the relation between generalized q-poly-Euler polynomials and Stirling numbers of the second kind through it. At the end, we provide symmetric properties related to generalized q-poly-Euler polynomials using alternating power sum.
  11. JUNG, N.S. 145
    https://doi.org/10.14317/jami.2020.145 PDF KSCI
    In this article, we define a generating function of the generalized (p, q)-poly-Bernoulli polynomials with variable a by using the polylogarithm function. From the definition, we derive some properties that is concerned with other numbers and polynomials. Furthermore, we construct a special functions and give some symmetric identities involving the generalized (p, q)-poly-Bernoulli polynomials and power sums of the first integers.
  12. RYOO, CHEON SEOUNG 159
    https://doi.org/10.14317/jami.2020.159 PDF KSCI
    In this paper we define a new generalized polynomials of derangements. It also derives the differential equations that occur in the generating function of the generalized polynomials of derangements. We establish some new identities for the generalized polynomials of derangements. Finally, we perform a survey of the distribution of zeros of the generalized polynomials of derangements.
  13. RAHIMIAN, MARYAM;SALKUYEH, DAVOD KHOJASTEH 175
    https://doi.org/10.14317/jami.2020.175 PDF KSCI
    Recently Salkuyeh and Rahimian in (Comput. Math. Appl. 74 (2017) 2940-2949) proposed a modification of the generalized shift-splitting (MGSS) method for solving singular saddle point problems. In this paper, we present the spectral analysis of the MGSS preconditioner when it is applied to precondition the singular saddle point problems with the (1, 1) block being symmetric. Some eigenvalue bounds for the spectrum of the preconditioned matrix are given. We show that all the real eigenvalues of the preconditioned matrix are in a positive interval and all nonzero eigenvalues having nonzero imaginary part are contained in an intersection of two circles.
  14. MATEJIC, M.M.;MILOVANOVIC, I.Z.;MILOVANOVIC, E.I. 189
    https://doi.org/10.14317/jami.2020.189 PDF KSCI
    Let G be a simple connected graph with n vertices and m edges. Denote by d1 ≥ d2 ≥ ⋯ ≥ dn > 0 and d(e1) ≥ d(e2) ≥ ⋯ ≥ d(em) sequences of vertex and edge degrees, respectively. If vertices vi and vj are adjacent, we write i ~ j. The general sum-connectivity index is defined as 𝒳α(G) = ∑i~j(di + dj)α, where α is an arbitrary real number. Firstly, we determine a relation between 𝒳α(G) and 𝒳α-1(G). Then we use it to obtain some new bounds for 𝒳α(G).