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아웃바운드 캠페인의 변경 희망률 추정을 위한 무응답 대체법 비교
신민웅,백정용 한국자료분석학회 2005 Journal of the Korean Data Analysis Society Vol.7 No.5
Out Bound Campaign is that tele-marketers sell financial goods to pre-selected target customers or persuade those customers to buy those goods.Although Out Bound Campaign ends after a series of process, a non-response problem occurs in campaign record for the analysis of results in statistical regard.In this paper, using random sampling, the following four methods would be used to find a estimator: ML Imputation and Bayesian Estimation which are methods of Conditional Means Imputation, and Simple Random Imputation and Approximate Bayesian Bootstrap Imputation which are methods of Multi-Imputation. Next, using stratified random sampling, the same four methods mentioned above would be used to find a estimator. Then, the estimators from the first four methods and those from the last four methods would be compared. 아웃 바운드 캠페인(out bound campaign)은 판매하고자 하는 금융 상품에 대해 텔러 마케터가 미리 선정된 목표고객 군을 대상으로 전화로 금융상품을 판매하거나 또는 가입을 권유하는 일이다. 아웃 바운드 캠페인은 일련의 과정을 걸쳐 종료되지만 결과 분석을 위한 캠페인 이력에는 통계적 의미에서 무응답 문제가 발생한다. 본 논문에서는 아웃 바운드 캠페인에서 발생하는 무응답 자료를 대체하는 방법에 대해 연구한다.먼저 조건부 평균대체 방법으로 대체한 ML 추정과 베이지안 추정을 구하고, 그 다음으로 다중대체 방법을 통한 단순랜덤대체(SR : simple random imputation)와 근사적 베이즈 붓스트랩 대체(ABB : approximate bayesian bootstrap imputation)를 추정한다. 그리고 앞의 네 가지 방법을 층화다중대체 방법으로 다시 추정하여 그 결과를 비교하였다.
열전도성 플라스틱을 이용한 김치냉장고용 열교환기에 관한 연구
강태호,백정용,권용하,김인관,김영수,신대식,박재홍,Kang Tae-Ho,Baek Jong-Yong,Kwon Yong-Ha,Kim In-Kwan,Kim Young-Soo,Sin Dae-Sik,Park Jae-Hong 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.4
The kimchi refrigerator is the electric home appliance which is used for the maturing and preserving of the kimchi in domestic and foreign market. The kimchi refrigerator is composed in 3 main parts as insulation. kimchi container, machinery room. The heat exchanger of kimchi refrigerator is made of aluminum and the other parts are made of steel and polymer. Also, kimchi refrigerator is expensive and heavy as compared with same class of refrigerator until now. In the present study, the possibility to replace heat exchanger from aluminum to thermal conductive plastic was analyzed and experimented. The thermal conductive plastic has $10{\sim}100$ times heat conductivity than that of normal plastic. It is known that heat transfer process is dependent not only conduction but convection or radiation. Thermal conductivity of the applied material in this research is over than 2 W/mK, thermal conductivity doesn't play a vital role on heat transfer. In this study, temperature is the most important parameter on the kimchi refrigerator and the temperature of kimchi refrigerator's heat exchanger was measured and compared with the temperature calibrated by CFD analysis on the inside wall of the kimchi refrigerator. It is important to keep constantly the inside temperature of the Kimchi refrigerator. Besides numerical analyses for the new thermal conductive plastic for heat exchanger were executed with the various height of evaporation tube. A series of experiments were conducted to compare the performance of the two heat exchanger made of aluminum and thermal conductive plastic at the same condition and certified the possibility of the thermal conductive plastic. According to these results, it was confirmed that the conventional aluminium heat exchanger can be replaced by thermal conductive plastic successfully.