• Journal of applied mathematics & informatics
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• 제26권1_2호
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• pp.417-425
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• 2008

For stationary m-dimensional martingale difference sequences we prove the random functional central limit theorems and propose an almost sure consistent estimator for the limiting covariance matrix.

• 대한수학회보
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• 제41권4호
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• pp.619-632
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• 2004

Some new oscillation criteria for parabolic neutral delay difference equations corresponding to two sets of boundary conditions are obtained. Our results improve the well known results in the literature.

• 대한수학회보
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• 제42권4호
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• pp.851-853
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• 2005

It is well known that the general term of a sequence can be represented by a linear combination of binomial coefficients. In this paper we give a simple proof for this fact.

• 대한수학회지
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• 제53권4호
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• pp.835-846
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• 2016

In this paper, we study entire solutions of some nonlinear difference equations and transcendental meromorphic solutons of some nonlinear differential equations. Our results generalize the results due to [11], [17].

• 대한수학회지
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• 제55권4호
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• pp.785-795
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• 2018

In this paper, we give a uniqueness theorem on meromorphic solutions f of finite order of a class of differential-difference equations such that solutions f are uniquely determined by their poles and two distinct values.

• Kyungpook Mathematical Journal
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• 제47권4호
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• pp.569-578
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• 2007

Sufficient conditions for the existence of at least one solution of boundary value problems for higher order nonlinear difference equations are established. We allow $f$ to be at most linear, superlinear or sublinear in obtained results.

• 충청수학회지
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• 제21권2호
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• pp.189-196
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• 2008

In this paper, we study h-stability for linear difference systems by using the notion of $n_{\infty}$-quasisimilarity and discrete Gronwall's inequality.

• 대한수학회보
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• 제53권2호
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• pp.373-386
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• 2016

In this paper, we investigate analytic and algebraic properties, and derive some identities satisfied by difference quotients of Chebyshev polynomials of the first kind.

• 대한물리의학회지
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• 제5권4호
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• pp.577-585
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• 2010

Purpose : This study was to evaluate gait velocity and stance time on 5 conditions in elderly women and elderly women with LBP. The subjects were 70's generation. Methods : The subjects are 20 divided into 2 groups. They measured gait velocity, stance-time. The 5 conditions were normal gait, 10cm obstacle gait, 25cm obstacle gait, dual 10cm obstacle gait, dual 25cm obstacle gait. The experimental period was between 2008/12 and 2009/2. Statistical analysis was used Repeated measurement for difference between conditions, independent t-test for difference in two groups. Subjects were countdown from 50 during dual task gait. Results : The results were as follow: there were significantly difference 10cm obstacle velocity, dual 10cm obstacle velocity in two group. The others were not significantly differences. Velocity and stance-time were significantly difference in control group. In dual 25cm obstacle gait, velocity was difference of normal gait. Stance-time was difference in 25cm obstacle gait, and dual 25cm obstacle gait. In Experimental group, velocity and stance-time were not significantly difference. But measured value of velocity was gradually decreased and stance time was increased. Conclusion : These results indicate that elderly people with LBP women are reduced gait ability in dual task, and obstacle condition. So they need to prevent falling in dual task, and obstacle gait and to train obstacle/dual tak gait.

• 동의생리병리학회지
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• 제23권2호
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• pp.505-511
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• 2009

The purpose of this study is to evaluate the difference about pathogenesis of smoker and non-smoker. Author used DSOM to investigate oriental pathogenesis. Smoke group is consisted of people who have history of smoke, and they don't have history of lung disease(Athma, tuberculosis, COPD, suchlike). Non-smoke group is consisted of people who have no history of smoke and they also don't have history of lung disease. Author carried out each group's PFT(Pulmonary Function Test) by AST(American Thoracic Society) method. DSOM was used for pathogenesis investigation of two groups. There was significant difference between smoke group and non-smoke group in FVC (p<0.05), and In non-smoke group, there was significant difference between male and famale in FVC, FVC%, FEV1, FEV1%. There was significant difference between smoke group and non-smoke group in Heat(熱), Cold(寒)(p<0.05). In Male grouop there was significant difference between smoker and non-smoker in deficiency of Deficiency of Yin(陰虛), Heat(熱). In non-smoke group comparison of sex, there was significant difference between male and female in Deficiency of blood(血虛), dampness(濕)(p<0.05). This result showed that the difference of pathogenesis between smoke group and non-smoke group.