2003학년도 조선대학교 신입생 특성 분석

류찬수,원효성,박근영 朝鮮大學校 學生生活硏究所 2004 生活指導硏究 Vol.23 No.1

한반도 강수량과 북반구 수증기 Flux와의 관련성 연구

류승란,류찬수 조선대학교 기초과학연구소 2001 自然科學硏究 Vol.24 No.-

The relationship between precipitation in the Korea and vapor flux over the northern hemisphere is investigated by analyzing the characteristics of atmospheric circulation over the northern hemisphere and vapor flux transport, which is induced by wind vector and specific humidity at 850 hPa, for dry and wet summers in Korea. The data used in this study are monthly precipitation data at 7 stations of the Korea during the period of 1940 to 1997 and NECP/NCAR reanalysis data. The analysis of atmospheric circulation over the northern hemisphere associated with the interannual variation of Korean summer precipitation shows that the atmospheric circulation in dry summer is different from that in wet summer. The wet summer in Korea is characterized by the convergence of the monsoonal flow originated from the Indian Ocean with the southwesterlies along the northwestern periphery of subtropical Pacific high at 850 hPa. In contrast, the dry summer in Korea is characterized by the weaken southwesterlies inflow from the Bay of Bengal toward the East Asia via the Indo-China peninsula and the weaken southwesterlies inflow associated with the northward shift of subtropical western Pacific high. In addition, it is found from the analysis of 200 hPa and 850 hPa wind vectors that the interannual variation of Korean summer precipitation is largely linked with the location of axis of upper-level jet stream. The axis of upper-level jet stream is shifted more southward in wet summer that in dry summer. It is also found that the wet summer is related to the blocking occurrence over the Manchurian region. Thus, it can be suggested that the variations of the warm and humid air over the southeast part of Tibet and the location and intensity of subtropical western Pacific high play a significant role in the interannual variation of the precipitation in Korea.

광주 지방의 강수량 변화와 Anomalies

류찬수 조선대학교 사범대학 부설 교과교육연구소 1999 敎科敎育硏究 Vol.2 No.1

In this paper it is discussed about interannual variation characteristics of presipitation amount of Kwangju and relationship with the SST anomaly. The daily data from 1940 to 1997 were used for precipitation amount and 2.5×2.5˚ grid of NOAA is also used for SST.The annual mean precioitation amount of Kwangju was 1287.5㎜, standard deviation was 306㎜, and variability was 23.77%, and then absolute variable value was 349㎜. The precioitation amount had a tendency to increase at 2.1㎜/year and the amplitude increased at ±3.77㎜/year. The positive anomaly of the precioitation amount presented seven times and the negative anomaly did eleven times. The annual mean precioitation days were 126.2 and standard deviation was 12.77, variability was 10.1% and then the absolute variable value was 9.77.We can conclude that the SST distribution of the North Pacific is the one facyor of precioitation amount change of Kwangju.

2002학년도 조선대학교 신입생 특성 분석

류찬수,김강진 조선대학교 학생지도연구소 2003 生活指導硏究 Vol.22 No.1

금속 알콕사이드를 원료로하여 분무 건조법에 의해 제조된 코오디어라이트 세라믹의 전기적 특성

박희찬,류봉기,류수착 釜山大學校生産技術硏究所 1995 生産技術硏究所論文集 Vol.49 No.-

코오디어라이트 세라믹 원료 분말이 금속 알콕사이드를 원료로 하여 제조되었다. 가수분해에 의해 제조된 졸을 분무 건조법과 오븐 건조기 건조법으로 건조하였으며 800℃에서 하소 처리한 후 1300℃에서 코오디어라이트 세라믹 소결체를 제조하였다. 분무 건조분말의 소결체의 유전상수 및 유전손실은 1㎒에서 1.1과 0.035의 값을 나타내었고, 건조기 건조분말의 소결체는 1.6 및 0.08의 값을 나타내었다. 분무건조 분말의 소결체의 겉보기 기공율 및 부피비중은 평균 1.3%와 2.448g/㎤ 이였고, 건조기 건조 분말의 소결체의 겉보기 기공율과 부피비중은 평균 3.2%와 2.185g/㎤이였다. Cordierite ceramic precursor powders were prepared from metal alkoxides. Hydrolyzed also were dried by spray dryer and oven dryer, and then they were calcined at 800℃. Calcined cordierite powders were sintered at 1300℃. In the codierite ceramics that were prepared from spray drying powders, dielectric constant and loss factor have 1.1 and 0.035 in 1MHz, respectively. In the codierite ceramics that were prepared from oven drying powders, dielectric constant and loss factor have 1.6 and 0.08 in 1MHz, respectively, Spray dried and sintered cordierite ceramics have apparent porosity of 1.3% and bulk density of 2.448g/㎤. Oven dried and sintered cordierite ceramics have apparent porosity of 3.2% and bulk density of 2.185g/㎤.

光州地方의 酸性降雨에 관한 硏究

吳椿河,柳承蘭,柳贊洙 조선대학교 기초과학연구소 1999 自然科學硏究 Vol.22 No.1

In this report, for Kwangju I shall discuss the relationship between precipitation and the pH. I shall look at the air pollutant and the pH. Data from this study for precipitation and the air pollutant were observed by KMA and YEA. The precipitation and the air pollutant were observed and recorded every hour from 1991 to 1995. Results : Annual mean pH was 5.6. The pH for November and the pH between January and May were 5.6 or less. The rate of acid rainy day in annual mean precipitation days was 48.1%. The occurrence of acid rain was more than 50%. The data shows that half of all rain in a year, was acid rain. The mean pH for March was 5.4 and there were 18 times acid rain occurred among 26 rainy times. This shows that rate of acid rain reaches 69%, it is a serious problem. The acidity is highest in the spring time and then followed in order by fall, winter and summer. The mean pH of precipitation in spring is 5.5, it means low level of acid rain. Daily variation of the pH doesn't have any special meaning. The pH in the afternoon is generally low and the highest pH level of acid rain was 4, which was observed between 19:00 and 21:00 on the 10th of March, 1991. The pH interannual variation of rain had a tendency to be high in 1992. But in 1995, the amplitude of the pH was large, so we can expect a high pH level of acid rain. As precipitation amount grews, the pH of precipitation tended to be low. Although, there is a little corelation(r=0.106) between frequency of acid rain and amount of rain. The lasting of rain for long periods raised the frequency of acid rain and standardized the pH. As the temperature goes up, consistency of pollutant also went up. But it is more reasonable to assume that consistency was raised by human activity. The temperature effect on the acidity of rain is minimal. NO_2 (r=0.205) is the primary effector on the acidity of rain, and then fellowed in order by SO_2 (r=0.118), TSP (r=0.019). However in fact, TSP has little influence on the acidity of rain.

雷雲內의 電荷分離 Mechanism에 關한 硏究

趙英男,柳承蘭,柳贊洙 조선대학교 사범대학 부설 교과교육연구소 1999 敎科敎育硏究 Vol.2 No.1

It is known that frictional rubbing between different ice surfaces causes electric charge separation, and Yoshida(1944) reported the colder ice was positively electrified. The mechanism of charge electric separation in thunderclouds is considered to be related to the friction or impact between ice crystal particles. In order to explain the mechanism for the electric charge separation in thunderclouds, the experiment was conducted. The results from that experiment through rubbing asymmetrically the artifially provided ice rods are as follows: Asymmetric rubbing was charged with effect of the temperature difference by a theory of thermoelectricity, when the colder ice was positively charged and the warmer ice negatively charged. The average difference of charge between them was 0.35volt. Opaque ice rod with air bubbles was chagred regardless of the effect of a theory of thermoelectricity. As the result of it, the cold ice rod was negatively charged and the effect of the friction was maximized by air bubbles. under a polarizing microscope, contact surface ice crystal cell was melted and frozen by the friction heat, and then was decreased in size. the charged volume was greatly increased at the colder range of -21℃∼-16℃ and was irregularly developed at warmer temperature region. the cooling apparatus made for experiment can be used in measuring the frictional charge generation.

우리나라 南西海岸의 海陸風 探究 : Centering around the city of Mokpo and Seochon

李承姬,柳贊洙 조선대학교 사범대학 부설 교과교육연구소 2000 敎科敎育硏究 Vol.3 No.1

Geographically, Three sides of Korea are surrounded by the sea(that is, the Korean Peninsular). Accordingly, the envioronment of our country has been greatly affected by the sea. For this study and taking an observation with AWS. I've selected the Mokpo city to which Taebul industrial complex is adjacent and Seochon, the central part of the western coast to which Asan industrial complex is adjacent. I've utilized the data on the change of the direction and the speed of the breeze of two areas(Mokpo and Seochon) through classifying all the data of the annual breeze into a daily unit, a monthly unit and a seasonal unit. As a result, there was a more vivid sea and land breeze character in Seochon area than in Mokpo area is due to the Mokpo's geographical location. In the frequency of breeze direction, NNW direction which occupied 27% of the whole was prevailing and in the frequency of breeze speed, the range of 0.3∼3.3㎧ appeared frequently, and it showed 48.9%. According to rarity analysis on the relations between breeze direction and breeze speed, a correlation coefficient was 0.56∼0.91 and through it. I could figure out correlation of breeze direction and breeze speed. But iti is matter of regret that this study has a statistical analytic basis mainly, so, from noe on, I intend to do profound research on factors which cause the change of sea and land breeze and I'd like to develop them to be processed as enviornmental factors.

기온의 일변화에 대한 고찰

박종익,원효성,류찬수 조선대학교 학생지도연구소 2004 生活指導硏究 Vol.23 No.1

The research of appearance time delay of highest and lower air temperature in a day and diurnal variation of air temperature were carried out and the results are as follow; 1) In respect to diurnal variation of mean temperature. the highest temperature in a day appear at 1500LST and the lowest temperature come out at 0600LST except for autumn. Therefore, it is considered that lowest temperature is observed just before sun rising or immediately after sunset. 2) The reason of appearance time delay of highest temperature is associated with continental degree and oceanic degree. At this point, the farther it is from costal area, the later highest temperature appear. 3) Characteristics of area where the frequency of highest temperature appearance before 1200LST is more than 10 day, is close to coastal line. This is caused by a) land-sea breeze occurrence, b) clear sky under 5.4 cloudiness, c) wet and high humid atmosphere, and d) high percentage of sunshine.

황사의 확산예측을 위한 기상정보의 시간해상도에 관한 수치연구

이순환,곽은영,류찬수,문윤섭 한국환경과학회 2004 한국환경과학회지 Vol.13 No.10

In order to predict air pollution and Yellow-sand dispersion precisely, it is necessary to clarify the sensitivity of meteorological field input interval. Therefore numerical experiment by atmospheric dynamic model(RAMS) and atmospheric dispersion model(PDAS) was performed for evaluating the effect of temporal and spatial resolution of meteorological data on particle dispersion. The results are as follows: 1) Base on the result of RAMS simulation, surface wind direction and speed can either synchronize upper wind or not. If surface wind and upper wind do not synchronize, precise prediction of Yellow-sand dispersion is strongly associated with upwelling process of sand of particle. 2) There is no significant discrepance in distribution of particle under usage of difference temporal resolution of meteorological information at early time of simulation. but the difference of distribution of particles become large as time goes by. 3) There is little difference between calculated particles distributions in dispersion experiments with high temporal resolution of meteorological data. On the other hand, low resolution of meteorological data occur the quantitative difference of particle density and there is strong tendency to the quantitative difference.