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상변화물질(PCM)을 이용한 공기조화 시스템용 동파방지밸브에 관한 실험적 연구
정순영(Jeong, Soon-young),윤재호(Yun, Jea-ho),김종하(Kim, Joung-ha),양윤섭(Yang, Yoon-sub),김성현(Kim, Seong-Hyun),송덕용(Song, Duk-yong) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.11
This paper is an experimental study on the freezing protection valve used for solar water heating, air-conditioning systems, and plumbing systems. When the phase change occurs from liquid to solid, most of the substances except water volumetrically shrink. And referred to as PCM(Phase Change Material) a substance with such properties, the phase change temperature varies depending on the material. To prevent the freezing of the plumbing system, such as air-conditioning system in the winter season, we developed a several types of freezing protection valve using PCM whose freezing temperature are 2-4℃. The working principle of the freezing protection valve is that the fluid inside the pipe is released to prevent the system-collapse when fluid temperature reaches the freezing temperature of the PCM. And then the valve is closed and returned to the original position automatically when the temperature of the operating fluid rises. In this paper, the operating temperatures, discharge flow rate and the response characteristics of the valve during the operation are tested and investigated. From the results of this research the freezing protection valves employing PCM are expected to be commercialized in the near future.
정순영(SOON YOUNG JEONG) 한국수소및신에너지학회 2021 한국수소 및 신에너지학회논문집 Vol.32 No.6
In this paper, an experimental study was conducted on the performance of the cooling tower. In order to improve reliability in the cooling tower performance test, the measurement uncertainty of the instrument was estimated. Measurement uncertainty refers to the uncertainty of a measurement, estimates the range in which the expected value of the measurement can be within a certain confidence level, and suggests a range in which the measured representative value is incorrect. Therefore, the measurement result of the performance experiment is not an actual value, but a reasonable estimated value. The measurement uncertainty for the test was calculated and the measured results were presented.
CoSm / Cr 박막의 자성층 두께에 따른 자기역전부피
정순영(Soon-Young Jeong),김현수(Hyeon Soo Kim) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.6
The magnetic switching volume is known as an important parameter to understand the magnetization reversal process, thermal stability of the written information and media noise. This parameter is influenced significantly by the microstructure of the magnetic layer as well as underlayer. Therefore, we fabricated CoSm/Cr thin films with varying magnetic layer thickness under constant sputtering by using a dc magnetic sputtering machine. The magnetic layer thickness effect on the magnetic switching volume have been studied by the means of magnetic viscosity and dc demagnetization remanence curve measurements. From these measurements, we found that the switching volumes increased with increasing the magnetic layer thickness, whereas the coercivity showed different behavior. These may be a result of the increased intergranular coupling and the larger volume fraction of the magnetic layer.
냉각탑 백연방지 최적 설계 및 성능향상에 관한 실험적 연구
정순영(Soon Young Jeong),윤재호(Jae Ho Yun),김종하(Joung Ha Kim),이병천(Byeong Cheon Lee),양현철(Hyeon Cheol Yang) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The occurrence of white plume in the cooling tower is phenomenon that the steam in the air through the cooling tower fan is condensed again by the cold ambient air to become saturated moist air. Accordingly, this can cause many problems like spoiling landscape around the cooling tower, odor of ambient air, falling accident by frozenness in the winter, and traffic accident, etc. This study was to install the heat exchanger in the inside of the cooling tower in order to prevent the white plume phenomenon in the cooling tower without affecting the performance of cooling tower. In addition, this study was to discharge the part of cooling water into the atmosphere through the recirculation of heat exchanger after creating dry air by heating the saturated moist air to the dew point temperature. At that time, this study was to conduct the experimental study in order to secure the optimal design data to prevent the white plume in the cooling tower because it checked the dry·moist temperature and relative humidity in the inside·outside of cooling tower on the moist air, and evaluated the performance of the heat exchanger.
정순영 ( Soon Young Jeong ) 조선대학교 인문학연구소 2011 인문학연구 Vol.0 No.42
우리나라 영어교육과정에서는 언어의 4가지 기능 중 듣기와 말하기가 읽기와 쓰기보다 강조되고 있지만, 우리의 현실은 교실 학습상황을 벗어나면 실제로 원어 민과 접촉하여 대화할 기회는 거의 없다고 할 수 있다. 더 나아가 역사적으로 생활화하고 실용화할 기회가 거의 없어 학습자들은 전적으로 책을 통하여 영어를 익히고 있다고 할 수 있다, 또한 사회의 급속한 발전과 지식의 가속적인 발전이 우리 학습자들에게 여러 도서 활동에 대하여 재고를 촉구하고 있기 때문에 본 연구는 우리나라 고등학교 학생의 영어독해학습에서 상용하는 독해전략에 대해 살펴보고 그에 따르는 독해지도방법을 제시하며 배경지식의 유무에 따라 친숙한 글과 친숙하지 않은 글에 대한 독해력결과를 바탕으로 학생들의 독해에 대한 학습자로서의 입장에 대한 견해를 참고로 하여 앞으로의 영어독해지도에 도움이 되고자 하였다. 이러한 의도로서 고등학교 독해에서의 전략사용과 배경지식의 유무에 따라 주제의 친숙도에 관한 독해에서의 문제점과 바람직한 독해방법에 대하여 논하였다. 본 연구에서는 학습자들이 주로 사용하는 독해전략을 설문조사를 통해 알아보고 학습자들이 주로 사용하는 개별독해전략의 사용빈도와 수준별 집단 간의 주제의 친숙도에 대한 평균과 표준편차를 알아보고 독해전략과 친숙도, 친숙도와 숙달도, 독해전략과 숙달도와의 관계를 분석하여 그 결과를 알아보았다. 이 실험의 결과 주제의 친숙도와 영어독해력 점수의 평균은 상승하여 유의적인 차이가 있었고, 독해전략은 영어독해력에 영향을 주지 못하였고, 배경지식이 있는 글의 친숙도가 독해에 영향을 미치므로 학습자의 선험지식에 도움이 되는 독해활동이 선행되었을 때 더욱 효과적이고 독해력에서의 고득점이 예상되었으며, 독해전략은 영어독해력에 상호작용 효과가 있다고 말할 수 없었다. 그러나 주제의 친숙도와 숙달도에 따라서 각각 영어독해력에 영향을 주고 있었으므로 배경지식이 있는 친숙한 글이 영어독해력에 영향을 줄 것으로 기대가 된다. The purpose of this study is to investigate the relationship between Korean high school students` reading comprehension and teaching methodology. This study is concluded as follows: statistically significant differences appear in reading comprehension depending on the topic familiarity and levels of the student proficiency. The study indicated that familiarity with the texts results in higher reading comprehension but there is no significant relationship in reading comprehension depending on topic familiarity and reading strategy. The pedagogical implication is that students reading in texts need to have some background knowledge of the content to reach a high level of comprehension.
스퍼터링 압력에 따른 CoSm / Cr 자성 박막의 Magnetic Switching Volumes
정순영(Soon-Young Jeong),김성봉(Sung-Bong Kim) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.5
CoSm thin films with a Cr underlayer have received continuous attention as a potential material for a high density longitudinal magnetic recording media. In this study the Ar gas sputtering pressure effects on the magnetic properties of CoSm thin films, which were fabricated by using a dc magnetron sputtering machine, were investigated. The magnetic switching volume is especially important parameter to understand the thermal stability of the written information, magnetization reversal process and media noise. Therefore, in this paper the effects of sputtering pressure on the magnetic switching volume of CoSm thin films grown on Cr underlayer with the same sputtering conditions was studied. As the Ar sputtering pressure during sputtering of the CoSm magnetic layer increases from 5 to 30 mTorr, the measured switching volumes decreased from 9.0 to 5.2×10^(-18)㎤. The calculated diameter of switching unit from V* was less than 22 ㎚, which satisfies the Sharrock's requirement on the thermal stability of the high density longitudinal magnetic recording media.