http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
濟州地方에서 쪽파(Allium ascalonicum L.)의 端境期 栽培 可能性에 關한 硏究
秦石天,張田益 濟州大學校 亞熱帶農業硏究所 1987 亞熱帶農業硏究 Vol.4 No.-
濟州在來 쪽파의 여름철 栽培를 爲하여 種球에 對한 貯藏溫度와 期間, GA₃및 ABA處理와 日長 및 遮光程度를 달리하여 出現 및 生育에 미치는 影響을 究明하고, 種球와 生育中인 植物體內의 GA 및 Auxin類似物質의 含量을 分析한 結果는 다음과 같다. 1. 濟州在來 쪽파의 出現 및 初期生長促進은 4℃의 低溫에서 30日間 貯藏한 것이 가장 良好하였다. 2. GA₃處理는 濃度間에 뚜렷한 出現促進效果가 없었으나 生長은 繼續 增加되었다. 3. ABA處理는 出現을 遲延시켰으나 濃度가 높을 수록 地上部의 生長도 抑制되었다. 4. 여름철의 自然日長과 16時間 日長區에서 地上部 生長이 良好하였고 8時間과 24時間區에서는 不良하였다. 5. 50% 및 85% 遮光處理한 것에서 草長이 길어졌고 露地에서는 伸長이 緩慢하였다. 6. GA 및 Auxin類似物質의 含量은 種球의 常溫貯藏과 生育中인 것에서 類似하였고 4℃에서 30日間 貯藏한 區에서 GA와 Auxin類似物質含量이 높았다. 7. 以上의 結果로서 濟州在來 쪽파의 여름철 栽培는 可能하지만 休眠性을 비롯한 生理的인 諸部分은 좀 더 硏究해야 될 것이라 생각되었다. Effects of bulb treatments such as cold storage temperature and period, application of GA₃ and ABA, day length and shading on emergence and growth of shallot were determined to establish cultural practices for Cheju native shallot in summer. The concentraton of GA and auxin like substances in bulbs for planting and growing plants was also determined. The results obtained are follow as; 1. Storaging bulbs at 4℃ for 30 days was suitalbe for promoting emergence and early growth of Cheju-native shallot. 2. Application of GA₃ did not promote emergence but increased growth continuously. 3. Application of ABA delayed emergence and the higher the concentration of solution was, the more the growth was retarded. 4. Shallot plant growed better under natural and 16 hours lighting than under 8 and 24 hours lighting. 5. Shallot plant growed better under 50 and 85% shading than under natural sun light. 6. Concentration of GA and ABA like substances was similar in bulbs storaged at normal temperature and growing plants but was higher in plants emerged from bulbs storaged at 4℃ for 30 days. 7. In consideration of the above results the summer cultivation of Cheju-native shallot determined to possible, but including the shallot dormancy, physiological subject and the others ought to make researches further in future.
최석천(Seuk Cheun Choi),최문영(Mun Young Choi),박설현(Seul-Hyun Park) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
The dimensionless extinction constants, Ke of soot produced from a small laminar flame burning ultra low sulfur diesel (ULSD) and soy methyl ester (B100) biodiesel fuel were measured in the visible (633㎚) wavelength. Experiments were performed at atmospheric pressure using a transmission cell in which simultaneous gravimetric sampling and light extinction techniques (GSLE) were employed. For the diesel soot, the average value of the Ke at 633nm was 11.1 whereas that of the Ke for biodiesel was 11.8 at the same wavelength. To quantitatively explain the difference in Ke in diesel and biodiesel soot, various factors including soot morphology and nanostructure were investigated.
최석천(Seuk Cheun Choi),이해종(Hae Jeong Lee),신유식(You Sik Shin),정한식(Han Shik Chung),정효민(Hyo Min Jeong),이광영(Kwang Young Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
In this study, a experimental method has been introduced for the various exhaust pipe geometry of 4-stroke single cylinder engine. The main experimental parameters are the variation of exhaust pipe diameters and lengths, to measuring the pulsating flow when the intake and exhaust valves are working. As the results of experimental test, the various exhaust geometry were influenced strongly on the exhaust pressure. As the exhaust pipe diameter was decreased, the amplitude and the number of compression wave in exhaust pressure was increased. According to decreasing pipe diameter, the number of compression wave in exhaust pressure was decreased. When the pipe diameter was increase, the second amplitude was increased.
최석천(Seuk Cheun Choi),이용훈(Young Hun Lee),이상철(Sang Chul Lee),정한식(Han Shik Chung),이광영(Kwang Young Lee),정효민(Hyo Min Jeong) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In the study, a computer analysis has been developed for predicting the pipe pressure of the in take and exhaust manifold in a single cylinder engine. To get the boundary conditions for a numerical analysis, one dimensional and unsteady gas dynamic calculation is performed by using the MOC(Method of Characterisitic). The main numerical parameters are the variation of the exhaust pipe diameters to calculate the pulsating flow when the intake and exhaust valves are woking. As the results of numerical nanlysis, the shapes and distributions of the exhaust pipe pressures were influenced strongly on the cylimder pressure, As the exhaust pipe diamrter is decreased, the anplitude of exhaust pressure large and the eylinder pressure was showed low in the region of intake valve opening time.
Choi, Seuk Cheun,Lee, Won-Ju,Roh, Beom-Seok,Park, Seul-Hyun Elsevier 2017 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.42 No.29
<P><B>Abstract</B></P> <P>The effect of elevated pressures on the soot formation in coaxial ethylene-diffusion flame was investigated under different ventilation conditions, i.e. one with a chamber valve closed and the other with a chamber valve open. Experimental measurements include the soot volume fraction and macroscopic flame behaviors such as visible height and flame shape. The presence of ventilation-assisted flow around the flame was found to further increase the visible flame radius and height at elevated pressures. The maximum soot volume fraction measured within the flame was also increased with the ventilation-assisted flow as well as with the ambient pressure. Experimental results clearly indicate that changes in the physical appearance of the flames altered by ventilation-assisted flow are an important factor to affect the sooting behavior in coaxial diffusion flames.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The presence of ventilation-assisted flow affects the appearance of flames. </LI> <LI> Changes in the appearance of flames are a critical factor for sooting behaviors. </LI> <LI> The maximum soot volume fraction increases with the ventilation-assisted flow. </LI> </UL> </P>
디젤엔진의 연료분사방법 및 부하가 연소 성능과 배출물 특성에 미치는 영향
최석천(Seuk Cheun Choi),노현구(Hyun Gu Roh),박성욱(Sung Wook Park),이창식(Chang Sik Lee) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
The purpose of this paper is to investigate the effects of fuel injection strategy and engine load on the combustion performance and emissions characteristics of a DI diesel engine with 1.58L of piston displacement. In order to analyze the particulate matter (PM) and exhaust emission characteristics in a direct injection diesel engine, the PM and exhaust emissions (including HC, CO and NOx,) were investigated under various injection strategies and engine loads. The results of this work indicate that the HC, CO and NOx emissions were increased in accordace with the engine loads. Also, the size of primary partice and radius of gyration are increased with the engine loads.