• Journal of the Korean Statistical Society
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• 제4권2호
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• pp.97-109
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• 1975

To gain knowledge about the unknown state $\theta$ of nature, we perform experiments. Sufficiency of an experiment for another experiment has been introduced for the comparison of experiments. The knoledge before and after an experiment makes it possible to discuss the amount of information provided by the experiment.

• 과학교육연구지
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• 제36권1호
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• pp.1-13
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• 2012

사범대학 조교수는 어떤 삶을 살고 있는가? 이 연구의 목적은 한 지방 국립 사범대학 조교수의 삶을 탐색하여 과학 교육 연구자 및 교사 교육자로서의 삶의 모습을 기술하고 이해하는 것이다. 연구자 스스로 삶을 정리하고 반성하는 자서전적 연구를 수행하였다. 조교수의 삶이 담겨진 기록들을 수집한 후 그것을 분류하는 틀을 개발하였다. 조교수의 삶을 대학에서의 삶과 개인적인 삶으로 크게 분류하고, 대학에서의 삶은 다시 교육, 연구, 봉사로, 개인적인 삶은 본인과 가정으로 구분하였다. 나의 다양한 삶의 모습에서 '변화'와 '학습'의 핵심 주제를 찾았고, 그에 해당하는 삶의 내용을 재구성하여 제시하였다. 그리고 조교수 시기의 나를 '자신에게서 타인으로', '어울림과 고립의 조화', '끊임없는 배움으로 운신의 폭 증가'로 표현할 수 있었다. 나의 삶에 대한 이해와 반성을 통해 사범대학 교수의 역할을 되짚어보고 교육적인 시사점을 논의하였다.

• Communications for Statistical Applications and Methods
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• 제7권1호
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• pp.151-164
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• 2000

In this paper we consider the Bayesian hypothese testing for independence and symmetry in Freund's bivariate exponential model with censored data In Bayesian testing problem we use the noninformative priors for parameters which are improper and are defined only up to arbitrary constants. And we use the recently proposed hypotheses testing criterion called the intrinsic Bayes factor. Also we derive the arithmetic and median intrinsic Bayes factors and use these results of analyze some data sets.

• 한국경영과학회지
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• 제16권1호
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• pp.113-119
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• 1991

The author is currently assistant professor of Management Science at Korea Advanced Institute of Science and Technology, following a few years as assistant professor of Industrial Engineering at Kyung Hee University, Korea. He received his doctorate from the department of Industrial Engineering and Operations Research, University of California, Berkeley. His research interests are time series and forecasting modelling, Bayesian forecasting and the related software development. He is now teaching time series analysis and econometrics at the graduate level.

• Communications for Statistical Applications and Methods
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• 제3권2호
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• pp.161-168
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• 1996

Multistage hierarchical models and Bayesian inferences about finite population total estimations are considered. Here, Gibbs sampling approach that can be used to predict the marginal posterior means needed for Bayesian inferences is proposed.

• Communications for Statistical Applications and Methods
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• 제3권2호
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• pp.169-174
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• 1996

In the present paper an attempt has been made to improve the Mangat Strategy (1994) in view of the protection of privacy, variance and the range of .pi.. Conditions are obtained under which the proposed model is more efficient than those of warner (1965) and Mangat and Singh(1990).

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2002년도 춘계학술대회논문집
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• pp.31-37
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• 2002

• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2001년도 Bulletin of The 5th Asian Design Conference International Symposium on Design Science
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• pp.39.1-39
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• 2001

• Journal of Biosystems Engineering
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• 제25권5호
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• pp.351-358
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• 2000

This study was conducted to develop a speed control system of a DC motor which drove a barley seeder mounted on a combine harvester. Barley seeder mounted on a combine has been known to reduce labor and cost of barley cultivation. However, development of the seeder has been unsuccessful because the combine, a dedicated rice and barley harvester has not enough space and proper power take-off for barley seeder. To develop a barley seeder, small powered motor speed controller was required. A proximity sensor for detecting working speed of the combine and a programmable one board microprocessor was used to develope a control system. Motor parameters and motor constant, relationship between seeding rate, motor speed, groove volumes of a tested roller, torque were measured. The proximity sensor sent a frequency signal to the microprocessor. In laboratory experiments, the excitation voltage of the motor was shown not to be proportional to the size of pulse width (duty ratio). A table transforming frequency signal, that represented for working speed to proper pulse width was developed from seeding rate experiments. However, seeding rate at low frequency signal was not proportional to the working speed. Seeding rate control proportional to the frequency signal was achieved by shifting of the frequency signal.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1992년도 가을 학술발표회 논문집
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• pp.191-195
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• 1992

Optimization of the RC pile cap for high rise apartment building has been performed with the aim of the cost minimization. The principle of divided parameters has been used. As a result the cost has been reduced by 25percentage.