• 제목/요약/키워드: computational mathematics

검색결과 3,205건 처리시간 0.037초

POSITIVE SOLUTIONS FOR MULTIPOINT BOUNDARY VALUE PROBLEMS WITH ONE-DIMENSIONAL p-LAPLACIAN OPERATOR

  • Xu, Fuyi;Meng, Zhaowei;Zhao, Wenling
    • Journal of applied mathematics & informatics
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    • 제26권3_4호
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    • pp.457-469
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    • 2008
  • In this paper, we study the existence of positive solutions for the following nonlinear m-point boundary value problem with p-Laplacian: $\{{{{(\phi_p(u'))'\;+\;f(t,u(t))=0, \;0<t<1,} \atop u'(0)={\sum}{^{m-2}_{i=1}}\;a_iu'(\xi_i),} \atop u(1)={\sum}{^k_{i=1}}\;b_iu(\xi_i)\;-\;{\sum}{^s_{i=k+1}}\;b_iu(\xi_i)\;-\;{\sum}{^{m-2}_{i=s+1}}\;b_iu'(xi_i),}$ where ${\phi}_p(s)$ is p-Laplacian operator, i.e., ${\phi}_p(s)=\mid s\mid^{p-2}s$, p>1, ${\phi}_q\;=\;({\phi}_p)^{-1}$, $\frac{1}{p}+\frac{1}{q}=1$, $1\;{\leq}\;k\;{\leq}\;s\;{\leq}m\;-\;2$, $b_i\;{\in}\;(0,+{\infty})$ with $0\;<\;{\sum}{^k_{k=1}}\;b_i\;-\;{\sum}{^s_{i=k+1}}\;b_i\;<\;1$, $0\;<\;{\sum}{^{m-2}_{i=1}}\la_i\;<\;1$, $0\;<\;{\xi}_1\;<\;{\xi}_2\;<\;{\cdots}\;<\;{\xi}_{m-2}\;<\;1$, $f\;{\in}\;C([0,\;1]\;{\times}\;[0,\;+{\infty}),\;[0,\;+{\infty}))$. We show that there exists one or two positive solutions by using fixed-point theorem for operator on a cone. The conclusions in this paper essentially extend and improve the known results.

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RADIO AND RADIO ANTIPODAL LABELINGS FOR CIRCULANT GRAPHS G(4k + 2; {1, 2})

  • Nazeer, Saima;Kousar, Imrana;Nazeer, Waqas
    • Journal of applied mathematics & informatics
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    • 제33권1_2호
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    • pp.173-183
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    • 2015
  • A radio k-labeling f of a graph G is a function f from V (G) to $Z^+{\cup}\{0\}$ such that $d(x,y)+{\mid}f(x)-f(y){\mid}{\geq}k+1$ for every two distinct vertices x and y of G, where d(x, y) is the distance between any two vertices $x,y{\in}G$. The span of a radio k-labeling f is denoted by sp(f) and defined as max$\{{\mid}f(x)-f(y){\mid}:x,y{\in}V(G)\}$. The radio k-labeling is a radio labeling when k = diam(G). In other words, a radio labeling is an injective function $f:V(G){\rightarrow}Z^+{\cup}\{0\}$ such that $${\mid}f(x)=f(y){\mid}{\geq}diam(G)+1-d(x,y)$$ for any pair of vertices $x,y{\in}G$. The radio number of G denoted by rn(G), is the lowest span taken over all radio labelings of the graph. When k = diam(G) - 1, a radio k-labeling is called a radio antipodal labeling. An antipodal labeling for a graph G is a function $f:V(G){\rightarrow}\{0,1,2,{\ldots}\}$ such that $d(x,y)+{\mid}f(x)-f(y){\mid}{\geq}diam(G)$ holds for all $x,y{\in}G$. The radio antipodal number for G denoted by an(G), is the minimum span of an antipodal labeling admitted by G. In this paper, we investigate the exact value of the radio number and radio antipodal number for the circulant graphs G(4k + 2; {1, 2}).

LINEAR EDGE GEODETIC GRAPHS

  • Santhakumaran, A.P.;Jebaraj, T.;Ullas Chandran, S.V.
    • Journal of applied mathematics & informatics
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    • 제30권5_6호
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    • pp.871-882
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    • 2012
  • For a connected graph G of order $n$, an ordered set $S=\{u_1,u_2,{\cdots},u_k\}$ of vertices in G is a linear edge geodetic set of G if for each edge $e=xy$ in G, there exists an index $i$, $1{\leq}i$ < $k$ such that e lie on a $u_i-u_{i+1}$ geodesic in G, and a linear edge geodetic set of minimum cardinality is the linear edge geodetic number $leg(G)$ of G. A graph G is called a linear edge geodetic graph if it has a linear edge geodetic set. The linear edge geodetic numbers of certain standard graphs are obtained. Let $g_l(G)$ and $eg(G)$ denote the linear geodetic number and the edge geodetic number, respectively of a graph G. For positive integers $r$, $d$ and $k{\geq}2$ with $r$ < $d{\leq}2r$, there exists a connected linear edge geodetic graph with rad $G=r$, diam $G=d$, and $g_l(G)=leg(G)=k$. It is shown that for each pair $a$, $b$ of integers with $3{\leq}a{\leq}b$, there is a connected linear edge geodetic graph G with $eg(G)=a$ and $leg(G)=b$.

Exploration of the application possibility of curriculum with mathematical modeling through coding activities

  • Kim, Dong-Joong;Kim, Won;Jung, Jae young;Choi, Sang-Ho
    • 한국컴퓨터정보학회논문지
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    • 제25권2호
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    • pp.241-250
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    • 2020
  • 본 연구는 미래 세대를 위한 교육 방법의 방향성을 제안하는 것이다. 이와 같은 방향성을 제안하기 위해 코딩활동과 수학적 모델링을 통합한 교수학습자료를 하향식과 상향식 과정을 통해 개발하였다. 코딩과 공학 전문가와 수학교육 전문가들이 협의회를 통해 교수·학습 자료를 개발하고(하향식 과정) 고등학교 1학년 학생 24명에게 적용하여 학생의 반응을 토대로 자료를 수정하였다(상향식 과정). 그 결과, 수업에 참여한 학생들은 개발된 자료를 바탕으로 동료들과 논의를 하고 코드를 수정하여 자신만의 스토리를 시각적으로 구현하였다. 한편 이 과정을 통해 수학 학습에 대한 흥미와 동기가 유발될 수 있고, 더 나아가 수학의 개념 이해, 문제 제기, 문제 해결에도 도움을 줄 수 있다고 결론지을 수 있었다. 이러한 결과를 토대로 4차 산업혁명 시대에 필요한 수학적 모델링과 코딩 활동을 통합하는 교육과정을 개발하는데 아이디어를 제공하였다고 볼 수 있다.

ON A THREE-DIMENSIONAL SYSTEM OF DIFFERENCE EQUATIONS WITH VARIABLE COEFFICIENTS

  • KARA, MERVE;YAZLIK, YASIN;TOUAFEK, NOURESSADAT;AKROUR, YOUSSOUF
    • Journal of applied mathematics & informatics
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    • 제39권3_4호
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    • pp.381-403
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    • 2021
  • 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.

텍스트 코딩을 활용한 중등수학 모바일 콘텐츠 개발 연구 (Mathematics & coding mobile contents for secondary education)

  • 이상구;이재화;남윤
    • 한국수학교육학회지시리즈E:수학교육논문집
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    • 제38권2호
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    • pp.231-246
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    • 2024
  • 본 논문에서는 텍스트 코딩을 활용하여 최근 개발한 중등수학 모바일(Mobile) 콘텐츠에 관하여 소개한다. 해당 콘텐츠는 복잡한 계산에 대한 부담을 덜어주고 함수의 그래프를 쉽게 그리는 등의 실습이 가능하도록 설계되어, 학생들이 단순 문제 풀이 시간을 절약하는 대신 확보한 시간을 활용해 수학 문제의 본질을 이해하고 응용하는 능력을 기름으로써 자신감을 향상시키고자 하는 의도로 기획되었다. 또한 코드를 통해 문제를 해결하는 과정과 절차를 보다 잘 인지할 수 있도록 함으로써, 컴퓨팅 사고력(Computatonal Thinking)과 알고리즘적 사고 향상에 도움을 주고자 하였다. 두 차례 각기 다른 수준과 다른 배경을 가진 학생들을 대상으로 본 콘텐츠를 시범 적용한 사례(대학생 대상 대학 미분적분학 학습 전 복습, 고등학생 대상 수학 과목 예습)에서 얻은 데이터와 프로젝트 결과물을 바탕으로 본 콘텐츠가 중·고등학교 수학을 효율적으로 예습·복습한다거나, 지필로 불가능한 복잡한 계산 및 시뮬레이션을 통한 결과 예측 등의 활동을 수행하는 데 활용될 수 있음을 확인하였다.

Strong Consistent Estimator for the Expectation of Fuzzy Stochastic Model

  • Kim, Yun-Kyong
    • International Journal of Reliability and Applications
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    • 제1권2호
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    • pp.123-131
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    • 2000
  • This paper concerns with the consistent estimator for the fuzzy expectation of a random variable taking values in the space F($R^p$) of upper semicontinuous convex fuzzy subsets of $R^p$ with compact support. We introduce the concept of a fuzzy sample mean and show that the fuzzy sample mean is a strong consistent estimator for the fuzzy expectation. Some examples are given to illustrate the main result.

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Tuning the Parameters for the Decision Making System in Order to Define Athlete's Aerobic and Anaerobic Thresholds

  • Ketola, Jaakko;Saastamoinen, Kalle;Turunen, Esko
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2004년도 ICCAS
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    • pp.317-320
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    • 2004
  • In this work we have managed to find parameters for defining athlete's aerobic and anaerobic thresholds. Thresholds which are of vital importance for top athletes. It is shown how differential evolution and different similarity measures has been used to tune computational model for threshold definitions. From our results it is obvious that the use of right parameter values for this kind expert system is of vital importance.

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THE ORDER AND SPEED OF CONVERGENCE FOR THE k-FOLD PSEUDO-OLVER'S METHOD LOCATING A SIMPLE REAL ZERO

  • Kim, Young Ik
    • 충청수학회지
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    • 제19권1호
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    • pp.49-56
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    • 2006
  • A convergence behavior is under investigation near a simple real zero for the k-fold pseudo-Olver's method defined by extending the classical Olver's method. The order of convergence is shown to be at least k+3. The asymptotic error constant is explicitly given in terms of k and the corresponding simple zero. Various numerical examples with a proposed zero-finding algorithm are successfully confirmed with the use of symbolic and computational ability of Mathematica.

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AN EXTRAPOLATED HIGHER ORDER CHARACTERISTIC FINITE ELEMENT METHOD FOR SOBOLEV EQUATIONS

  • Ohm, Mi Ray;Shin, Jun Yong
    • East Asian mathematical journal
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    • 제33권5호
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    • pp.511-525
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    • 2017
  • We introduce an extrapolated higher order characteristic finite element method to construct approximate solutions of a Sobolev equation with a convection term. The higher order of convergence in both the temporal direction and the spatial direction in $L^2$ normed space is established and some computational results to support our theoretical results are presented.