• 대한수학회논문집
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• 제33권1호
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• pp.85-101
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• 2018

Let S be a polynomial ring over a field K, with a monomial order ${\prec}$, and let I be an unmixed graded ideal of S. In this paper we study two functions associated to I: The minimum distance function ${\delta}_I$ and the footprint function $fp_I$. It is shown that ${\delta}_I$ is positive and that $fp_I$ is positive if the initial ideal of I is unmixed. Then we show that if I is radical and its associated primes are generated by linear forms, then ${\delta}_I$ is strictly decreasing until it reaches the asymptotic value 1. If I is the edge ideal of a Cohen-Macaulay bipartite graph, we show that ${\delta}_I(d)=1$ for d greater than or equal to the regularity of S/I. For a graded ideal of dimension ${\geq}1$, whose initial ideal is a complete intersection, we give an exact sharp lower bound for the corresponding minimum distance function.

• The Journal of Asian Finance, Economics and Business
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• 제8권8호
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• pp.13-19
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• 2021

To provide empirical evidence on the impact of export instability on economic growth in developing countries, this study estimated the neoclassical production function using data of the Jordanian economy for the period 1995-2019. Real exports, real capital, and export instability were the independent variables in the production function. To determine the appropriate methodology for estimating the production function, the study conducted some preliminary tests, including the Augmented-Dickey Fuller (ADF), on the study data. The results of this test indicated that all study variables were stationary at first difference. Therefore, the Johanson cointegration test was applied to determine that there was cointegration between the study variables since the results of the former test indicated that there was one cointegration vector between these variables. The cointegration equation revealed a positive and statistically significant impact of real capital, real exports, and an indicator of export instability on economic growth. The most important policy implications for these results would be reducing the geographical concentration of exports through the expansion of free trade agreements (FTA) to enhance the positive impact of the instability of exports on economic growth. Moreover, the study recommends strengthening export-oriented actions to achieve higher levels of economic growth.

• 한국노년학
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• 제40권3호
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• pp.413-428
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• 2020

본 연구는 '2017년도 노인 실태조사'에 응답한 65세 이상 노인 8,942명을 대상으로 ICT를 활용한 자녀·손자녀 접촉빈도, 디지털 리터러시 등의 특성이 인지기능에 미치는 영향을 파악하기 위한 이차자료 분석 연구로, 다중 회귀분석을 활용하였다. 연구 결과 노인의 인지기능에 가장 큰 영향을 미치는 요인은 디지털 리터러시로 나타났다. 또한 ICT를 활용한 손자녀와의 접촉빈도는 디지털 리터러시 및 인지기능과 유의한 상관관계가 있으며 인지기능에 긍정적 영향을 주는 요인임이 새롭게 밝혀졌다. 이를 토대로 노인을 대상으로 한 정보화 교육 및 활용의 중요성과 이를 통한 세대 간 의사소통 활성화의 필요성에 대해 논의하였다.

• 감성과학
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• 제16권4호
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• pp.457-468
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• 2013

본 연구는 긍정정서를 사회성 축에 따라 사회적 긍정정서와 비사회적 긍정정서로 나눌시 조망수용능력과 긍정적 대처간의 관계가 다르게 나타나는지 알아보았다. 그리고 그 관계가 성격변인인 친화성에 따라 조절되는지를 살펴보았다. 이를 위해 대학생을 대상으로 실험 1과 2를 실시하였다. 연구 결과, 사회적 긍정정서를 느낀 집단은 비사회적 긍정정서 집단보다 통계적으로 유의하게 조망수용능력이 높고, 회피/체념 대처전략보다 긍정적 대처전략을 택하는 경우가 많은 것으로 나타났다. 아울러, 긍정정서의 사회성 유무와 조망수용능력간의 관계에서는 성격변인인 친화성이 유의한 조절효과가 있었다. 즉, 비사회적 긍정정서를 느낀 사람이 사회적 긍정정서를 느낀 사람에 비해 친화성이 높을수록 조망수용능력이 유의하게 높아지고 있음을 확인하였다. 반면, 긍정정서의 사회성 유무와 긍정적 대처간의 관계에서는 친화성의 조절효과가 없었다. 사회적 긍정정서와 비사회적 긍정정서간의 차이 및 원인에 대해 언급하고 본 연구의 제한점과 후속 연구방향에 대해 논의하였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.1639-1642
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• 1997

In this paper, the autonomic function analysis system was designed to noninvasively assess the autonomic function of cardiovascular system. Orthostatic stress protocol was designed to stimulate the autonomic nervous system. designed protocol and analysis algorithm were evaluated by experiments for 25 normal subjects and 22 hemiplegia patients. Data were processed by usign the power spectral analysis. Nwe indexes of autonomic function, LF$_{N}$ and HF$_{N}$, were proposed and were compared with LF/HF ratio. New indexes of the sympathetic and parasympathetic activity, respectively. The IST and the DPT are balanced and have positive value for normal subjects during orthostatic stress but not for hempilegia patients. This result suggest that the IST and the DPT are used as new criteria of normal autonomic function during orthostatic stress.ess.

• Journal of the Korean Statistical Society
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• 제26권1호
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• pp.1-22
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• 1997

In the linear regression model $y_{i}$ = .alpha. $x_{i}$ $^{T}$ .beta. + .epsilon.$_{i}$ , i = 1,2,...,n, the weighted pairwise absolute deviation (WPAD) estimator was defined by minimizing the dispersion function D (.beta.) = .sum..sum.$_{{i $w_{{ij}}$$\mid$ $r_{j}$ (.beta.) $r_{i}$ (.beta.)$\mid$, where $r_{i}$ (.beta.)'s are residuals and $w_{{ij}}$'s are weights. This estimator can achive bounded total influence with positive breakdown by choice of weights $w_{{ij}}$. In this paper, we consider a more general type of dispersion function than that of D(.beta.) and propose a pairwise GM-estimator based on the dispersion function. Under some regularity conditions, the proposed estimator has a bounded influence function, a high breakdown point, and asymptotically a normal distribution. Results of a small-sample Monte Carlo study are also presented. presented.

• 대한수학회지
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• 제57권6호
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• pp.1535-1549
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• 2020

This paper deals with the inverse of tails of Hurwitz zeta function. More precisely, for any positive integer s ≥ 2 and 0 ≤ a < 1, we give an algorithm for finding a simple form of f_s,a(n) such that $$\lim_{n{\rightarrow}{\infty}}\{\({\sum\limits_{k=n}^{\infty}}{\frac{1}{(k+a)^s}}\)^{-1}-f_{s,a}(n)\}=0$$. We show that f_s,a(n) is a polynomial in n-a of order s-1. All coefficients of f_s,a(n) are represented in terms of Bernoulli numbers.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 A
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• pp.315-318
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• 2003

This paper proposes a switching control method applicable to any affine, 2nd order nonlinear system with single input. The key contribution is to develop a control design method which uses a piecewise continuous Lyapunov function non-increasing at every discontinuous point. The proposed design method requires no restrictions except full state availability. To obtain a non-increasing, piecewise continuous Lyapunov function, we change the sign of off-diagonal term s of the positive definite matrix composing the former Lyapunov function according to the sign of the Inter-connection term. And we use the solution of inequalities which guarantee each Lyapunov function is non-increasing at any discontinuous point.

• 대한수학회보
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• 제34권1호
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• pp.29-34
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• 1997

Let $U = {z \in C : $\mid$z$\mid$ < 1}$ be the open unit disc in the complex plane and let N be the class of all analytic functions p in U with p(0) = 1.

• 한국의류학회지
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• 제36권10호
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• pp.1074-1086
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• 2012

This study examines the influence of mentoring function on major adaptation of university students in a fashion related department and identifies the moderating role of self-efficacy and mentor competence on the effectiveness of a fashion mentoring function. Questionnaire data were gathered from 266 university students in a fashion related department with previous experience in a mentoring program. The results showed that the psychosocial function, sensitivity developmental function, and the fashion career developmental function had a positive impact on the department adaptation (adaptation for professor and adaptation for learning). In addition, there were moderating effects of self-efficacy on the influence of the fashion career developmental function on professor adaptation and the moderating effects of mentor competence on the influence of the sensitivity developmental function on professor adaptation. The results of this study provide various guidelines for professors or administrators of fashion related departments who are interested in mentoring systems.