• 소음진동
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• 제9권4호
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• pp.806-812
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• 1999

Dynamic behaviors are analyzed for a flexble spinning disk with angular acceleration, considering geometric nonlinearity. Based upon the Kirchhoff plate theory and the von Karman strain theory, the nonlinear governing equations are derived which are coupled equations with the in-plane and out-of-planedisplacements. The governing equations are discretized by using the Galerkin approximation. With the discretized nonlinear equations, the time responses are computed by using the generalized-$\alpha$ method and the Newton-Raphson method. The analysis shows that the existence of angular acceleration increases the displacements of the spinning disk and makes the disk unstable.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2001년도 가을 학술발표논문집 Vol.28 No.2 (2)
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• pp.241-243
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• 2001

데이터 마이닝을 통해 우리는 숨겨진 지식, 예상되지 않았던 경향 그리고 새로운 법칙들을 방대한 데이터에서 이끌어내고자 한다. 본 논문에서 우리는 사용자들의 구매 트랜잭션을 시간에 따라 분석하여 동시에 구매되는 상품을 미리 예측하는 알고리즘을 제안하고자 한다. 기존의 방법들에서는 구매된 상품간의 시간차를 고려하지 않은 방법만을 제안해 왔다. 따라서 서로 연관되지 않은 상품군이 예측될 확률이 높았다. 본 논문에서 제안하고 있는 $\alpha$ chain rube에서는 일정 시간동안의 사용자들이 상품을 구매한 후 다음 상품을 구매할 때까지의 시간을 고려한다. 따라서 좀더 정확히 동시에 구매될 상품군을 예측할 수 있다. 본 논문은 제안하고 있는 $\alpha$ chain rule을 계산해 내는 알고리즘에 대해 주로 논의하겠다.

• 제어로봇시스템학회논문지
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• 제10권4호
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• pp.295-303
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• 2004

Previously it has been shown that the all pole systems resulting good time responses can be characterized by so called K-polynomial. The polynomial is defined in terms of the principal characteristic ratio $\alpha_1$ and the generalized time constant $\tau$ . In this paper, Part II presents several sensitivity analyses of such systems with respect to $\alpha_1$ and $\tau$ changes. We first deal with the root sensitivity to the perturbation of $\alpha_1$ . By way of determining the unnormalized function sensitivity, both time response sensitivity and frequency response sensitivity are derived. Finally, the root sensitivity relative to $\tau$ change is also analyzed. These results provide some useful insight and background theory when we select of and l to compose a reference model of which denominator is a K-polynomial, which is illustrated by examples.

• 호남수학학술지
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• 제40권1호
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• pp.61-73
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• 2018

The main aim of this research paper is to evaluate the general integral of the form $${\int_{0}^{1}}x^{c-1}(1-x)^{c+{\ell}}[1+{\alpha}x+{\beta}(1-x)]^{-2c-{\ell}-1}\atop {\times}_3F_2\left\[ {a,\;b,\;2c+{\ell}+1} \\ {\frac{1}{2}(a+b+i+1),\;2c+j\;;\frac{(1+{\alpha})x}{1+{\alpha}x+{\beta}(1-x)} }\right]dx$$ in the most general form for any ${\ell}{\in}\mathbb{Z}$; and $i, j=0,{\pm}1,{\pm}2$. The results are established with the help of generalized Watson's summation theorem due to Lavoie, et al. Fifty interesting general integrals have also been obtained as special cases of our main findings.

• 디지털융복합연구
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• 제14권1호
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• pp.321-326
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• 2016

치주질환은 치아주위 조직에 발현된 염증성 질환이다. 전염증성 사이토카인인 $TNF-{\alpha}$는 국소적인 염증이나 전반적인 염증과 관련이 있는 것으로 알려져 있다. 본 연구의 목적은 한국인에서 TNF 유전자 다형성과 전반적 급진성 치주염 간의 관계를 알아보고자 하였다. 연구대상은 실험군이 60명, 대조군이 81명 이었다. 협측에서 DNA를 채취하여 각 제한효소를 이용한 PCR-RFLP에 의해 $TNF-{\alpha}-308$과 -238을 측정하였다. 급진성 치주염 환자에서 $TNF-{\alpha}-308$ 유전자형은 A/A 3.2%, A/G 38.7% 그리고 G/G 82.35%가 나타났으며 대조군에서는 각 9.1%, 45.5%, 45.5%로 유의한 차이를 보이는 결과이다. $TNF-{\alpha}-238$의 대립유전자 2의 빈도는 실험군에서 67.6%, 대조군에서 72.2%로 유의한 차이를 보였다. 이러한 결과에 따르면 $TNF-{\alpha}-308$과 -238의 유전자다변성은 한국인의 급진성치주염과 연관이 있을 것으로 생각된다.

• Kyungpook Mathematical Journal
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• 제50권3호
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• pp.379-387
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• 2010

In this paper, we present some results concerning orthogonal generalized (${\sigma},{\tau}$)-derivations in semiprime near-rings. These results are a generalization of result of Bresar and Vukman, which are related to a theorem of Posner for the product of two derivations in prime rings.

• Kyungpook Mathematical Journal
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• 제50권1호
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• pp.37-47
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• 2010

In this present work, the authors obtain Fekete-Szeg$\ddot{o}$ inequality for certain normalized analytic function f(z) defined on the open unit disk for which $\frac{(1-{\alpha})z(D^m_{{\lambda},{\mu}}f(z))'+{\alpha}z(D^{m+1}_{{\lambda},{\mu}}f(z))'}{(1-{\alpha})D^m_{{\lambda},{\mu}}f(z)+{\alpha}D^{m+1}_{{\lambda},{\mu}}f(z)}$ ${\alpha}{\geq}0$) lies in a region starlike with respect to 1 and is symmetric with respect to the real axis. Also certain applications of the main result for a class of functions defined by Hadamard product (or convolution) are given. As a special case of this result, Fekete-Szeg$\ddot{o}$ inequality for a class of functions defined through fractional derivatives is obtained. The motivation of this paper is to generalize the Fekete-Szeg$\ddot{o}$ inequalities obtained by Srivastava et al., Orhan et al. and Shanmugam et al., by making use of the generalized differential operator $D^m_{{\lambda},{\mu}}$.

• 대한기계학회논문집
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• 제15권1호
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• pp.28-40
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• 1991

본 연구에서는 4변이 단순 지지된 두꺼운 역대칭 앵글 플라이 적층판의 굽힘, 좌굴 및 진동 거동을 규명하였으며, 인장과 굽힘, 비틀림 사이의 결합 특성을 고려하 였고, 전단 변형을 고려하였다.또 유사 변환 개념을 도입하여 복합 재료 적층판의 거동을 일반화 하였다.

• 호남수학학술지
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• 제39권3호
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• pp.349-361
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• 2017

By means of the Oberhettinger integral, certain generalized integral formulae involving product of generalized k-Bessel function $w^{{\gamma},{\alpha}}_{k,v,b,c}(z)$ and general class of polynomials $S^m_n[x]$ are derived, the results of which are expressed in terms of the generalized Wright hypergeometric functions. Several new results are also obtained from the integrals presented in this paper.

• Communications for Statistical Applications and Methods
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• 제22권3호
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• pp.233-239
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• 2015

This study compares two generalized Lindley distributions and assesses consistency between theoretical and analytical results. Data (complete and censored) assumed to follow the Lindley distribution are generated and analyzed using two generalized Lindley distributions, and maximum likelihood estimates of parameters from the generalized distributions are obtained. Size and power of tests of hypotheses on the parameters are assessed drawing on asymptotic properties of the maximum likelihood estimates. Results suggest that whereas size of some of the tests of hypotheses based on the considered generalized distributions are essentially ${\alpha}$-level, some are possibly not; power of tests of hypotheses on the Lindley distribution parameter from the two distributions differs.