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최민선(Minseon Choi),박민규(Minkyu Park),조성환(Sunghwan Cho),한석재(Seogjae Han) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In view of growing concerns over global warming, diesel engine is more effect tool. Current development activities on diesel engines are aimed primarily on reducing emissions and improving fuel consumption. This paper describes how the water pump, traditionally driven from the crankshaft through a mechanical link, can be enhanced to satisfy increased demands for coolant flow and also save power by eliminating unnecessary operation. It's considered variable water pump to reduce the engine motoring friction by using non operating water pump controls and reduced engine operating friction with the reduction of warm up period with water and oil temperature relatively increased. With this analysis, it is possible to decide the direction of the reduction of the diesel engine fuel reduction development.
최민성 ( Min Sung Choi ) 한국언어문화학회 2015 한국언어문화 Vol.0 No.57
This article studied content about Mokwol’s poetry. This article studied that many writer created story in the poetry aspect. Mokwol’s poetry is attractive character because he have several dimention in mind, will of he’s goal. And studied three dimention treated place content. The Fatal Encounter can’t created better character of Mokwol’s poetry but made appealing character to contemporary audience. That improved fixing of Mokwol’s poetry. It is necessary to create new dimention of Mokwol’s poetry. Hope this article contribute making of Mokwol’s poetry and storytelling of that.
통계적 추정을 가르치기 위한 수학적 지식(MKT)의 분석
최민정 ( Choi Min Jeong ),이종학 ( Lee Jong Hak ),김원경 ( Kim Won Kyung ) 한국수학교육학회 2016 수학교육 Vol.55 No.3
Knowledge and data interpretation on statistical estimation was important to have statistical literacy that current curriculum was said not to satisfy. The author investigated mathematics teachers`` MKT on statistical estimation concerning interpretation of confidence interval by using questionnaire and interview. SMK of teachers`` confidence was limited to the area of textbooks to be difficult to interpret data of real life context. Most of teachers wrongly understood SMK of interpretation of confidence interval to have influence upon PCK making correction of students`` wrong concept. SMK of samples and sampling distribution that were basic concept of reliability and confidence interval cognized representation of samples rather exactly not to understand importance and value of not only variability but also size of the sample exactly, and not to cognize appropriateness and needs of each stage from sampling to confidence interval estimation to have great difficulty at proper teaching of statistical estimation. PCK that had teaching method had problem of a lot of misconception. MKT of sample and sampling distribution that interpreted confidence interval had almost no relation with teachers`` experience to require opportunity for development of teacher professionalism. Therefore, teachers were asked to estimate statistic and to get confidence interval and to understand concept of the sample and think much of not only relationship of each concept but also validity of estimated values, and to have knowledge enough to interpret data of real life contexts, and to think and discuss students`` concepts. So, textbooks should introduce actual concepts at real life context to make use of exact orthography and to let teachers be reeducated for development of professionalism.