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金熹載,李興周 陸軍士官學校 1984 한국군사학논집 Vol.26 No.-
Effect of heat treatment on the high cycle fatigue behavior of high strength aluminum alloy 7039 was examined by microcopy, mechanical and fatigue test. The elongated plateshaped grain by the effect of hot rolling and oxide or coarse super hardened particles, Cr compound(CrAl_7)were observed on the optical microscopy. The density of coarse inherent, θ phase(MgZn_2) was decreased as the time of artificial aging was increased. S1 specimen developed by holding at 480C for 2 hours, holding at room temperature for 72 hours and then aging at 120C for 24 hours was showed the most ex-cellent fatigue limit.
김희재 강남대학교 국어국문학과 1996 江南語文 Vol.9 No.-
방송광고는 하나의 설득 커뮤니케이션으로 광고 상품에 대한 직접 또는 간접적인 언어적 주장을 한다. 방송광고는 비록 20-30초의 짧은 시간이지만 음성언어와 문자언어의 강렬한 표현으로 반복해서 방송되기 때문에 소비자에게 커다란 언어적 영향력을 행사한다. 방송매체는 보편성과 대중성을 지니고 있기 때문에 국민의 언어생활에도 커다란 영향을 미친다. 본고에서는 방송광고가 '국민의 언어생활에 커다란 영향을 미친다'는 명제하에 방송광고에서 범해지는 발음, 어휘, 문법, 의미·화용적 오류와 외래어의 올바른 발음을 연구하는데 그 목적을 두고 있다.
Reliability Estimation in the Mixed Distribution of Exponential and Geometric Distributions
김희재 한국자료분석학회 2012 Journal of the Korean Data Analysis Society Vol.14 No.2
The exponential and geometric distributions have been recognized as a useful model for survival model associated with reliability studies and life testing experiments. This paper deals with estimating reliability from a mixture of exponential and geometric distributions. First, the maximum likelihood estimation is used to estimate the reliability of mixed model when data are grouped and Type-1 censored. Second, the Bayesian estimation is used to estimate the reliability. Third, the plug-in estimation is used to estimate the reliability. Forth, the mean square error of maximum likelihood estimator (MLE) is obtained. Finally, Bayesian and plug-in estimators for MLE will be compared numerically in the terms of various mission times, parameter values in the sense of asymptotic relative efficiency through Monte Carlo simulation.
Reliability Estimation in the Mixed Distribution of Exponential and Rayleigh Distributions
김희재 한국자료분석학회 2011 Journal of the Korean Data Analysis Society Vol.13 No.4
Exponential distribution and Rayleigh distribution have been recognized as a useful model for survival model associated with reliability studies and life testing experiments. This paper deals with estimating reliability from a mixture of exponential distribution and Rayleigh distribution. First, the estimation is used to estimate the reliability of mixed model when data are grouped and type-1 censored. Second, the Bayesian estimation is used to estimate the reliability. Third, the plug-in estimation is used to estimate the reliability. Forth, the mean square error (MSE) of maximum likelihood estimator (MLE) is obtained. Finally, Bayesian estimators and plug-in estimators for MLE will be compared numerically in the terms of various mission times, parameter values in the sense of asymptotic relative efficiency through Monte Carlo simulation.
Reliability Estimation of a 2-Unit Warm-Standby System with Rayleigh Lifetime Distribution
김희재 한국자료분석학회 2011 Journal of the Korean Data Analysis Society Vol.13 No.6
The warm standby system has been recognized as a useful model for reliability studies and life testing experiments. This paper deals with estimating reliability of a 2-unit warm- standby system with Rayleigh lifetime distribution that switch is perfect. First, the maximum likelihood estimation is used to estimate the reliability of the model when data are grouped and type-1 censored. Second, the Bayesian estimation is used to estimate the reliability. Third, the generalized maximum likelihood estimation is used to estimate the reliability. Finally, the Bayesian estimator and generalized maximum likelihood estimator for the maximum likelihood estimator (MLE) will be compared with numerically in terms of various mission times, parameter values in the sense of asymptotic relative efficiency through Monte Carlo simulation.
Reliability Estimation in the Mixed Distribution of Geometric and Rayleigh Distributions
김희재 한국자료분석학회 2012 Journal of the Korean Data Analysis Society Vol.14 No.5
The geometric and Rayleigh distributions have been recognized as a useful model for survival model associated with reliability studies and life testing experiments. This paper deals with estimating reliability from a mixture of geometric and Rayleigh distributions. First, the maximum likelihood estimation is used to estimate the reliability of mixed model when data are grouped and type-1 censored. Second, the Bayesian estimation is used to estimate the reliability. Third, the plug-in estimation is used to estimate the reliability. Forth, the mean square error of maximum likelihood estimator (MLE) is obtained. Finally, Bayesian and plug-in estimators for MLE will be compared numerically in the terms of various mission times, parameter values in the sense of asymptotic relative efficiency through Monte Carlo simulation.
김희재 한국자료분석학회 2009 Journal of the Korean Data Analysis Society Vol.11 No.4
The shared load system has been recognized as a useful model for reliability studies and life testing experiments. This paper deals with estimating reliability of shared load system with two Weibull lifetime distributions. The Weibull distribution has been recognized as a useful model for life testing experiments. First, the maximum likelihood estimation (MLE) is used to estimate the reliability of the model when data are Type-I censored. Second, the Bayesian estimation is used to estimate the reliability under gamma prior. Third, the plug-in estimation is used to estimate the reliability. The Bayesian and plug-in estimation for MLE will be compared with numerically in the terms of various mission times, parameter values in the sense of asymptotic mean square error through Monte Carlo simulation.