• 약학회지
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• 제17권1호
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• pp.31-39
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• 1973

The influence of guanethidine on the renal function was investigated in the rabbit. Guanethidine, 1-10mg/kg, i.v., produced no marked change in the renal function, while second and successive doses of guanethidine elicited a significant increase in urine flow and electrolyte excretion as well as renal plasma flow and glomerular filtration rate. It was suggested that the diuretic action was brought about by improvement of hemodynamic state in the kidney ; increased filtration as a result of increased renal perfusion. Atropine alone did not significantly influence the renal function but pretreatment of animals with atropine, 4 mg/kg i.v., completely abolished the diuretic action of guanethidine. It is suggested that guanethidine influences the renal function by activating parasympathetic nervous system or some cholinergic mechanism in the kidney.

• 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.

• Human Ecology Research
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• 제59권3호
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• pp.387-400
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• 2021

This study examined the structural relationship between children's academic stress, grit, executive function difficulty, and media device addiction. Data on 1,132 children and their mothers from the 11^th (2018)Panel Study on Korean Children were used for the study. Data were collected by Academic Stress Scale, Grit Scale-Children, Child-Adolescent Self-reported Executive Function Difficulty Screening Questionnaire, and K-Internet Addiction Scale. Data were analyzed using SPSS 25.0 and AMOS 23.0 program with Pearson correlation, structural equation model and bootstrapping. The main results were as follows. 1) Children's academic stress had a negative influence on their grit. 2) Children's grit had a negative influence on their executive function difficulty and media device addiction. 3) Children's executive function difficulty had a positive influence on their media device addiction. 4) The relationship between children's academic stress and media device addiction was mediated by their grit and executive function difficulty. This study is significant in the sense that it found protective factors and risk factors for children's addiction to media devices. We suggest that children's grit be improved, and their academic stress and executive function difficulty be reduced to prevent and mediate children's media device addiction.

• Journal of the Korean Statistical Society
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• 제30권4호
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• pp.563-571
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• 2001

In this paper, we study selecting a transformation so that the transformed variable is nearly symmetrically distributed. The large sample properties of an M-estimator of transformation parameter that is obtained by minimizing the integrated square of the imaginary part of the empirical characteristic function are investigated when a random sample is selected from some unspecified distribution. According to influence function calculations and Monte Carlo simulations, these estimates are less sensitive, than the normal model maximum likelihood estimates, to a few outliers.

• Smart Structures and Systems
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• 제24권4호
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• pp.475-490
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• 2019

The detection of structural damage without a priori information on the healthy state is challenging. In order to address the issue, the study presents a baseline-free approach to detect damage in beam structures based on an actual influence line. In particular, a multi-segment function-fitting calculation is developed to extract the actual deflection influence line (DIL) of a damaged beam from bridge responses due to a passing vehicle. An intact basis function based on the measurement position is introduced. The damage index is defined as the difference between the actual DIL and a constructed function related to the intact basis, and the damage location is indicated based on the local peak value of the damage index curve. The damage basis function is formulated by using the detected damage location. Based on the intact and damage basis functions, damage severity is quantified by fitting the actual DIL using the least-square calculation. Both numerical and experimental examples are provided to investigate the feasibility of the proposed method. The results indicate that the present baseline-free approach is effective in detecting the damage of beam structures.

• 한국조리학회지
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• 제16권2호
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• pp.31-48
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• 2010

본 연구의 목적은 웹사이트를 이용하는 소비자들이 기능별 지각 수준이 다른 웹사이트로 전환하는 행동에 미치는 영향을 알아보고자 실시되었다. 분석 방법은 외식기업 웹사이트 사용자들을 대상으로 설문지를 배포하였으며, 응답자들의 일반적인 특성 파악을 위해 빈도분석과 외식기업 웹사이트의 기능별 지각 수준이 전환 행동과의 영향 관계를 분석하기 위해 단순 회귀분석과 다중회귀분석을 사용하였다. 연구 결과는 다음과 같다. 외식기업 웹사이트 기능별 지각 수준이 전환 행동에 미치는 영향을 분석한 결과, 오락 기능, 광고 기능, 커뮤니케이션 기능, 구매 결정 기능 모두 전환 행동에 유의한 영향을 미쳤으며, 지각 수준이 높을수록 전환 행동도 높아지는 것으로 나타났다. 특히 다음의 요소들이 전환 행동에 유의성을 나타내었다. 오락 기능의 지각 수준 중 검색이 이해하기 용이했다. 광고 기능의 지각 수준 중에서는 레스토랑 이미지가 쉽게 각인된다. 커뮤니케이션 기능의 지각 수준에 있어서는 신 메뉴 출시를 쉽게 알 수 있다. 구매 결정기능의 지각 수준 중에서는 웹사이트 이용은 자유롭다에서 전환 행동에 높은 유의성을 나타내었다.

• 응용통계연구
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• 제30권4호
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• pp.529-538
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• 2017

Ghosh와 Kim에 의해 소개된 영 변환 모형은 0이 많거나 적을 때 계수형 자료(count data)를 분석하는 모형이다. 이 모형의 산포형태모수는 평균과 분산, 0 확률로 구성되며 ${\mu}$와 ${\sigma}^2$의 관계에 따라 2가지 형태를 가진다. 본 논문에서는 ${\sigma}^2{\geq}{\mu}$일 때, Ghosh와 Kim 영 변환확률 모형의 모수 ${\delta}$에 대한 영향함수를 도출하였다. 도출한 영향함수의 타당성을 검증하기 위해서 인구주택총조사 자료를 이용해 관측치가 제거된 경우에서 영향함수로 도출한 ${\delta}$ 추정치 변화값과 직접 계산한 ${\delta}$ 추정치 변화값을 비교하였다. 그 결과 영향함수는 ${\delta}$의 변화를 매우 정확히 추정하였다.

• Journal of the Korean Statistical Society
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• 제28권2호
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• pp.265-277
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• 1999

Classical and inverse estimation methods are two well known methods in statistical calibration problems. When there are outliers, both methods have large MSE's and could not estimate the input value correctly. We suggest median calibration estimation based on the LD-statistics. To investigate the robust performances, the influence function of the median calibration estimator is calculated and compared with other methods. When there are outliers in the response variables, the influence function is found to be bounded. In simulation studies, the MSE's for each calibration methods are compared. The estimated inputs as well as the performance of the influence functions are calculated.

• Journal of applied mathematics & informatics
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• 제28권3_4호
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• pp.913-921
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• 2010

The derivative influence measure is adapted to the Cholesky decomposition of a covariance matrix. Formulas for the derivative influence of observations on the Cholesky root and the inverse Cholesky root of a sample covariance matrix are derived. It is easy to implement this influence diagnostic method for practical use. A numerical example is given for illustration.

• 대한가정학회지
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• 제50권6호
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• pp.77-87
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• 2012

The purpose of this study is to investigate the influence of the mentoring function and mentor trust on the intention to reparticipate in the mentoring program, focusing on university students in fashion related departments. To achieve the purpose, research was conducted through a survey questionnaire. The questionnaire data from 223 university students in fashion related departments who experienced mentoring programs were analyzed. SPSS 18.0 and AMOS 7.0 statistical packages were used to investigate a structural model and test research hypotheses. The results derived from the analysis of the questionnaire survey were summarized as follows. First, the result showed that the mentoring function was composed of three factors: a sensitivity developmental function, psychosocial function, and fashion career developmental function. Second, the sensitivity developmental function, psychosocial function, and fashion career developmental function positively affected mentor trust. Third, the sensitivity developmental function positively affected the intention to reparticipate in the mentoring program, while the psychosocial function and fashion career developmental function did not influence the intention to reparticipate in the mentoring program. Fourth, mentor trust positively influenced the intention to reparticipate in the mentoring program. The results of the current study would be useful for the professor and university administrator who would like to establish a mentoring program in a fashion related department, by exploring the relation of mentoring function, mentor trust and the intention to reparticipate in the mentoring program.