• 한국품질경영학회:학술대회논문집
• /
• 한국품질경영학회 2004년도 품질경영모델을 통한 가치 창출
• /
• pp.430-435
• /
• 2004

Nonhomogeneous Poisson Process is often used to model failure times which occurred in software reliability and hardware reliability models. It can be characterized by its intensity functions or mean value functions. Many parametric intensity models have been proposed to account for the failure mechanism in real situation. In this paper, we propose a Bayesian semiparametric approach based on beta-mixtures. Two real datasets are analyzed.

• Communications for Statistical Applications and Methods
• /
• 제7권1호
• /
• pp.337-356
• /
• 2000

In Korea mathematics education of middle school has been taken according to the 6th national mathematics curriculum which was renovated by the Ministry of Education announcement in 1992. The eight middle school mathematics textbooks are composed of under this curriculum The education of probability and statistics has been carried out as a part of statistics education centering around middle school's mathematics textbooks.

• 호남수학학술지
• /
• 제23권1호
• /
• pp.145-158
• /
• 2001

In this paper we investigated a replacement model with two types of repairs. Repairs are classified into minimal and perfect repair. An operating unit is completely replaced whenever it reaches age ${\tau}({\tau}>0)$(planned replacement). If it fails at age $t<{\tau}$, it is either restored by a entire unit with probability p(t)(perfect repair), or it undergoes minimal repair with probability $\bar{p}(t)=1-p(t)$. After a planned replacement, the procedure is repeated.

• Communications for Statistical Applications and Methods
• /
• 제3권3호
• /
• pp.187-194
• /
• 1996

We treat the problem of estimating reliability R = P[Y < X] in the stress-strength model in which a unit of strength X is subfected to enviromental stress Y./ In this paper several nonparametric approaches to estimation of R are analyzed and compared by simulations.

• Journal of applied mathematics & informatics
• /
• 제8권2호
• /
• pp.627-634
• /
• 2001

Under contamination, Bahadur representations with a strong remainder term are derived for random central order statistics with a prescribed limiting rank, and asymptotic normalities for these statistics of truncated and contaminated data are proved, with a suitable limiting rank. From these results, an application to the fixed-width confidence interval problem is available.

• 한국통계학회:학술대회논문집
• /
• 한국통계학회 2003년도 춘계 학술발표회 논문집
• /
• pp.191-197
• /
• 2003

This paper considers the independence test for two stationary infinite order autoregressive processes. For a test, we follow the empirical process method devised by Hoeffding (1948) and Blum, Kiefer and Rosenblatt (1961), and construct the Cram${\acute{e}}$r-von Mises type test statistics based on the least squares residuals. It is shown that the proposed test statistics behave asymptotically the same as those based on true errors.

• Communications for Statistical Applications and Methods
• /
• 제7권3호
• /
• pp.655-665
• /
• 2000

Several information criterions, Schwarz information criterion (SIC), Akaike information criterion (AIC), and the modified Akaike information criterion ($AIC_c$), are proposed to locate a change point in the multiple linear regression model. These methods are applied to a stock Exchange data set and compared to the results.

• 한국문헌정보학회지
• /
• 제36권2호
• /
• pp.73-87
• /
• 2002

공공도서관 통계는 도서관 자원 및 서비스에 대한 객관적이 평가지표인 동시에 도서관 계획 및 정책의 수립 과정을 비롯한 도서관 경영 전반에 유용하게 이용될 수 있는 도구이다. 본 연구는 공공도서관 현황에 대한 정확한 측정과 보고가 이루어질 수 있는 국가단위의 공공도서관 통계 수집 및 제공 시스템을 확립하기 위해 이루어져야할 기본적인 과제가 무엇인가를 밝히고 개선 방향을 제시하는 것을 목표로 한다. 이를 위하여 문헌연구를 통하여 통계의 의의와 이용자 및 활용분야를 정리하고 주요 국가단위 공공도서관 통계수집 사례를 살펴본 후, 도서관협회에서 매년 발행하는 $\ulcorner$도서관 통계$\lrcorner$를 대상으로 공공도서관 통계 수집 현황을 통계항목의 타당성, 수집통계의 신뢰성, 일관성 및 신속성, 그리고 도서관 평가 및 경영과정에서의 유용성을 중심으로 분석하고 개선을 위한 방안을 제시하였다.

• 응용통계연구
• /
• 제18권1호
• /
• pp.197-210
• /
• 2005

본 연구에서는 중등학교 통계교육을 위하여, 제7차 수학과 교육과정 중 고등학교에서 사용하는 검정교과서 수학 1과 국정교과서 확률과 통계의 확률통계 영역을 중심으로 용어와 개념 및 표현을 비교, 연구하였다. 검정과 국정교과서의 표본표준편차의 정의가 일치되지 않았으며, 표분평균의 분산과 중심극한정리에 대한 개념설명이 교과서마다 상이하였다. 또한, 확률변수 개념 설명이 불분명 한 교과서도 발견되었다. 본 연구에서는 오류의 수정과 더불어 표본분산으로 불편추정량을 사용할 것을 제안하였다.

• Communications for Statistical Applications and Methods
• /
• 제16권4호
• /
• pp.647-658
• /
• 2009

It is already known from the previous study that flood seems to have heavier tail. Therefore, to make prediction of future extreme label, some agreement of tail behavior of extreme data is highly required. The LH-moments estimation method, the generalized form of L-moments is an useful method of characterizing the upper part of the distribution. LH-moments are based on linear combination of higher order statistics. In this study, we have formulated LH-moments of five distributions useful in hydrology such as, two types of three parameter kappa distributions, beta-${\kappa}$ distribution, beta-p distribution and a generalized Gumbel distribution. Using LH-moments reduces the undue influences that small sample may have on the estimation of large return period events.