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다목적 회분공정의 최적생산계획을 위한 조업완료시간의 순환수학적표현법
박상대(Sang Dae Park),정재학(Jae Hak Jung) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.3
Recently, as the taste of consumers and the demand of products are changed within short period and the life cycle of products is shortened, the operation of semicontinuous and batch processes have been studied more frequently over the past decade. In general, the productivity of batch process is lower than that of continuous process. For these reason most of researches in batch process are focused on increasing the productivity. The study of operation of batch processes used to be classified as two category; multi-product batch process and multi-purpose batch process. Between them, multi-product processes were actively studied, but only a few papers about the multi-purpose batch plants were presented. Because the operation of multi-purpose batch process is more complicated than that of multi-product batch plant. In this paper we presented completion times algorithm of non-sequential multi-purpose batch process[13] with non-zero transportation times and set-up times as a recursive formulation. We also described the formulation by computer program and flowchart and the results of calculation by gantt chart and processing map. For testing the proposed formulation, we applied them to several problems which are composed of randomly generated processing times, set-up times and transfer times.
The Relationship between Maternal Parenting Factors and Infants’ Temperament
박재학(Park Jae hak),조재숙(Jo Jae Sook),이덕현(Lee Dok hyun) 숭실대학교 영재교육연구소 2018 Global Creative Leader Vol.8 No.3
본 연구는 영아 기질의 하위요인 사회성, 활동성, 정서성과 주 양육자가 되는 어머니의 주요 양육요인인 자아존중감, 사회적 양육, 자녀가치, 자기효능감, 양육스트레스, 우울 간의 관계에 분석하였다. 이를 위하여 2010년도에 조사한 한국아동패녈 3차년도 자료를 활용하여 두 독립표본 t-test, 상관관계분석, 중다회귀분석을 이용하여 분석하였다. 분석결과는 다음과 같다. 첫째, 어머니의 양육요인들은 영아의 기질과 서로 관련성이 높았다. 둘째, 어머니의 양육요인 중 긍정적 요인이 되는 자아존중감, 사회적 양육, 자녀에 대한 정서적 가치기대는 영아의 기질에 긍정적인 영향을 끼치는 것으로 나타났다. 이에 따라 영아의 사회성, 활동성, 정서성 등 기질을 높이기 위하여 어머니의 양육요인 중 긍정적인 양육요인에 더 많은 관심을 가질 것을 제안하였다. 본 연구는 영아에 대한 연구에 있어 기질을 변하지 않는 요인으로 고정하지 않고 변할 수 있는 요인으로 상정하여 연구하였다는데 의의가 있다. The purpose of this study was to investigate the relationship between sociability, activity and emotionality of infants, which are the sub-factors of temperament, and their mothers self-esteem, social parenting, value of children, self-efficacy, parenting stress and depression, which are the major factors of maternal parenting. The 3rd-year data of Panel Study on Korean Children were used, and two independent samples t-test, correlation analysis and multiple regression analysis were carried out to analyze the data. The findings of the study were as follows: First, there were close mutual relationships between the maternal parenting factors and infant temperament. Second, the self-esteem, social upbringing, and emotional value expectations of children, which are positive factors of mothers’parenting, have a positive effect on infant temperament. Given the findings of the study, temperament should be regarded as a variable factor, rather than as an invariable one, in studies of infants and preschoolers. This study implies that the research on infant studies is based on factors that can be changed without changing the temperament.