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최종민(Jongmin Choi),김귀택(Gwi Taek Kim),정융(Yoong Chung),이상욱(Sangwook Lee),김민수(Min Soo Kim) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.11
In this study, grid tests have been conducted on a transient heat transfer modelling for electric motors in order to study the effect of the number of elements in the modelling. First, the modelling has developed using finite difference method to simulate the temperature change inside the motors when heat losses and cooling occurs. The number of elements in components in the motors such as a shaft, rotor, coil, stator, and frame are set to variables in the modelling. In this study, the number of elements of the coil and stator are altered and the result of each temperature are examined.
최종민(Jongmin Choi),이승연(Seungyeon Lee),김민수(Min Soo Kim) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
In this study, we have developed a magnetic refrigeration prototype composed of a magnetic field source, a hydraulic system and active magnetic regenerators. A magnet assembly provides magnetization or demagnetization effect over a magnetocaloric material, which leads to heating up or cooling down the material. The hydraulic system includes working fluid, a hydraulic pump, and solenoid valves in order to transport heat from cold side to hot side heat exchangers in oscillating flow. We have also installed four active magnetic regenerators and each pair of them is connected in series. The single regenerator contains around 140.2 g of 2.36~3.35 mm gadolinium chips with 560.7 g in total in the system. In the experiments, we have achieved maximum 4.1 ℃ of temperature separation under no load condition with 0.2 Hz of system operation speed.
최종민(Jongmin Choi),정현준(Hyun Joon Chung),주영주(Youngju Joo),강훈(Hoon Kang),김용찬(Yongchan Kim) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.11
The cooling load in winter is significant in buildings and hotels because of the usage of office equipments and the high efficiency of wall insulation. Hence, the development of a multi-heat pump that can cover heating and cooling simultaneously for each indoor unit is required. In this study, the performance of a simultaneous heating and cooling heat pump was investigated in the heat recovery mode (HR mode). The system adopted a variable speed compressor using R410A with four indoor units and one outdoor unit. In the HR mode, the capacity and COP were improved as compared with those in the cooling or heating mode because the waste heat in the outdoor unit was utilized as useful heat in the indoor units. However, energy imbalance between heating and cooling capacity of each indoor unit was observed in the 2H-1C HR mode. Therefore, the performance of the system in the 2H-1C HR mode was enhanced by controlling refrigerant flow rate through the outdoor unit.
가스방전관(GDT)을 적용한 서지보호장치 회로의 DC 동작전압 최적조건 고찰
최종민(Jongmin Choi),전태현(Taehyun Jeon) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.7
It is made compulsory to install SPD for the purpose of protecting electric and electronic devices when an abnormal voltage such as lightning occurs to power line using power frequency of 60㎐. Recently, the high speed communication technology utilizing power line is receiving attention again as a communication technology for smart grid. The SPD influences the performances of power line communication when using SPD and power line communication system together. In order to improve the performance of power line communication, a proposed scheme for series connection of gas discharge tube to ZnO varistor was presented. This paper measured the impacts of series connection of GDT to SPD using ZnO varistor on the limit voltage of Class Ⅲ SPD. This paper also presented the DC operating voltage of GDT which satisfies the limit voltage of power line communication system and SPD simultaneously.
최종민 ( Jongmin Choi ),조광래 ( Kwangrae Cho ) 전남대학교 지역개발연구소 2021 지역개발연구 Vol.53 No.3
정부는 기술 기반의 창업을 활성화하고자 다양한 지원하고 있으며, 그 중 창업기업의 비용적인 부담의 감소와 지역의 집적경제효과 발생을 위해 다양한 공간 제공 지원을 추진하고 있다. 이러한 배경에서 본 연구의 목적은 혁신형 창업기업의 집적화를 극대화하기 위한 제도적 방향을 제시하는 것에 있다. 본 연구는 250개 혁신형 창업기업을 대상으로 입지 선호요인을 조사하였고, 이를 소재지·창업기간·창업분야별로 교차분석을 실시하였다. 분석 결과 첫째, 수도권과 비수도권 여부 등의 소재지에 따라서 입지 선호 요인이 통계적으로 차이가 있는 것으로 나타났다. 둘째, 사업장 이전 기업을 대상으로 조사한 결과에서도 마찬가지로 소재지에 따라서 이전 사유에서 통계적인 차이가 존재하였다. 셋째, 집적효과를 발생시키는 데 필요한 시설과 기관이 무엇인가를 분석한 결과에서도 소재지, 창업 기간별로 차별적 요구가 존재하는 것으로 나타났다. 이를 토대로 기술 기반 혁신형 창업기업의 성공적인 집적화를 위해서는 수도권과 비수도권, 업력별로 차별화된 정책이 필요함을 확인하였다. The purpose of this study is to shed light on the institutional direction necessary to maximize the agglomeration of technology-based start-ups. This study surveyed 250 innovative start-ups to investigate location preference factors, and analyzed them by location, the founding year of start-ups, and technology field. The results reveal that, first, location preference factors of start-ups were found to be statistically different depending on the location, such as whether it was in the metropolitan area or non-metropolitan area. Second, the reasons for start-ups' relocation were different depending on the location. Third, it was found that there were differences in the facilities and institutions required for agglomeration by location and the founding year of start-ups. Customized policies suitable for start-ups according to metropolitan area and non-metropolitan area and firm age are necessary for successful agglomeration.
최종민 ( Jongmin Choi ) 한국경제교육학회 2017 경제교육연구 Vol.24 No.2
본 논문에서는 학교 급별, 학년별 연계성과 위계성의 정점에 있고 ‘경제’라는 교과 명칭이 유일하게 부여되는 ‘고등학교 경제’2015 개정 교육과정의 형식 및 목표, 내용체계·내용영역·내용요소, 성취기준, 교수·학습방법 및 평가의 방향 등을 2009 개정 교육과정과 비교 분석하고, 이를 토대로 이후에 개정될 교육과정의 바람직한 방향을 모색해 보았다. 그 결과, 2015 개정 교육과정에서 1영역이 통합·감소되었고, 내용요소도 27개에서 21개로 축소되었으며, 고난도의 성취기준이 삭제되었고, 내용적·방법론적인 측면에서 다양한 사례와 논리적 해석방법이 포함된 영역별 교수·학습방법이 새롭게 제시되는 등 주목할 만한 변화가 있었음을 확인하였다. 그럼에도 불구하고 학습내용의 적정화와 학생 중심의 교실수업을 위해, 이후에 개정될 경제과목 교육과정에는 첫째, 종래의 ‘수학능력시험’위주에서 ‘학생생활기록부’위주로 전환되는 교육현장의 여건이 충분히 반영되어야 한다, 둘째, 고등학교 경제수업이 학기제 중심으로 운영되고 있다는 현실이 고려되어야 한다. 이를 위해서는 내용체계·내용영역·내용요소가 학생들이 장차 민주시민으로 살아가는 데 필수적인 경제원리 중심으로 대폭 축소되어야 한다. 셋째, 성취기준, 영역별 교수·학습방법, 평가방법 등도 학생 중심의 교실수업이 가능하고 그 결과물이 학생부에 잘 반영될 수 있도록 다양한 사례 중심으로 개편되어야 한다. The purpose of this paper were to analyze the changes by comparison 2015 revised economic subjects curriculum to 2009 revised curriculum, and to seek for the desirable direction of curriculum that will be revised later on. In the results, there have been significant changes in the 2015 revised curriculum. Nevertheless, for the rationalization of learning contents and student-centered lesson, the economic subjects curriculum revised later on, first, should fully reflect the conditions of school environments going through the change from the existing College Scholastic Ability Test to ‘Students' School Record'. Second, it should consider the reality that high school economic lesson is run based on the semester system. For this, content structures·contents area·contents elements should be substantially reduced. Third, the standard of achievement, teaching·learning methods in each area, and evaluation methods should be reformed focusing on diverse cases.