랑방 복합 스포츠 문화센터

E+E,Leth&Gori 현대건축사 2014 월간 CONCEPT Vol.- No.180

固定平面壁에 平行하게 運動하는 球의 假想質量變化에 관한 硏究

朴伊東,孫寬浩 成均館大學校 科學技術硏究所 1984 論文集 Vol.35 No.1

An exact solution for the three dimensional incompressible potential flow due to translation of a rigid sphere moving parallel to a rigid plane wall is presented. A bispherical coordinate system was used to simplify the boundary conditions. Also, bispherical coordinate system has been used to obtain exact solution on the velocity potential. The Laplace equation was solved by means of seperation of variables and the exact solution on the velocity potential was derived in infinite series form. The kinetic energy of a quiscently incompressible fluid perturbed by the motion of a rigid sphere was calculated from the velocity potential. And the exprsesion for the virtual mass of a rigid sphere was obtained from the formula which involved the term of the kinetic energy. According to the equation of the ratio of the virtual mass of a rigid sphere moving in the presence of a plane wall(M) to the virtual mass a rigid sphere moving in a infinite fluid(M_∞), the Vrtual mass of a rigid sphere increases significantly as it approach a rigid plane wall. When the ratio of the distance from wall to sphere center(H) to sphere radius (R) approaches 1, the ratio of the virtual mass of a rigid sphere moving in the presence of a plane wall (M) to the virtual mass a rigid sphere moving in a infinite fluid(M_∞) approaches 1.223. When the ratio of the distance from wall to sphere center(H) to sphere radius(R) is larger than about 8, the effect of a rigid plane wall on a rigid sphere is almost neglected.

한국 賃金勞動者層 내부구성의 변화

정이환 서울産業大學校 1994 논문집 Vol.40 No.1

Korea has a quite militant labor movement and arm's length labor-management relations. One of the factors of this labor militancy is the internal composition of the working class. A large part of the Korean working class have been production workers employed in large establishments, and they've been quite homogeneous internally. They had many features characterizing traditional 'proletariat'. However, the internal composition of the Korea working class is changing these days. First of all, the percentage of the production workers out of the whole working class is getting smaller. Even the number of production workers itself if decreasing. Instead if it, the portion of the white collar workers is increasing. Secondly, the temporary workers who are called the 'peripheral working strata' are increasing. They are subsituting permanant workers. Thirdly, the percentage of the workers employed in large establishments is decreasing, while that of the workers of small establishments are increasing. In sum, we can say that the integrity of traditional working class is beginning to be disintegrated from the end of the 1980's in Korea. These changes are expected to be the factors which will weaken the militancy of Korean labor movement. These changes, nevertheless, are slow, and their effects on labor movement and industrial relations shouldn't be exaggerated.

피조개, Scapharca broughtonii의 대사에 미치는 부니의 영향

정의영,신윤경,이주하 한국패류학회 1994 The Korean Journal of Malacology Vol.10 No.1

遠心펌프回轉車內의 壓力特性에 關한 實驗的 硏究

朴伊東,金東燮,權養球 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.2

The distribution of pressure in an impeller of a centrifugal pump was investigated to operate under the optimum, conditions according to the variation of dynamic factors such as rotational speed and flowrate in an impeller. The interchange of energy actually are as follows. 1) The variations of pressure in the radial direction had almost the same patterns as the flowrate was changed and the outlet pressure decreased with the increase of the flowrate. 2) It showed that the pressure increased in the radial direction of impeller as the rotational speed increased, and the same phenomenon took place with the variation of flowrate. Otherwise there was little recovery of pressure in the region of low rotational speed and high flowrates(5.0, 5.5 lps) . 3) The head-flowrate of the characteristic curves increased simultaneously according to the increase of rotational speed, and the power gradient of the power-flowrate curve increased as the rotational speed increased and the efficiency-flowrate curve showed that the efficiency was the same in a low flowrate and higher in a high flowrate according to the increase of rotational speed.

열저장조 내의 Negative Buoyant Jet 유동 특성에 관한 실험적 연구

박이동,황성일,조운 成均館大學校 科學技術硏究所 1994 論文集 Vol.45 No.1

In cold water storage system, efficiency is mostly dominated by the mixture of incomming cold water and initial storage water. The most desirable flow pattern is to minimise the mixture of incomming water and storage water and to obtain the stable stratification. During the cold water storage, the flow pattern of incomming water is negative buoyant jet effected by initial momentum and buoyant force. In this study, two characteristics of negative buoyant jet were measured. One is concerned with degree of mixture such as entrainment rate, dilution ratio and the other is radius of curvature, concerned with the jet trajectory. There were two vairables used in this experiment. One was dynamic variables such as inlet mass flow rate, temperature difference between initial water temperature in the tank and inflow water temperature into storage tank, and the other was geometrical variables such as the height of inlet port, and inlet port diameter. Through this experiment, the optimum conditions of cold water storage by using the characteristics of negative buoyant jet were 5.7 < Fr< 8.1, 0-4<r<0.6, 7.3 < Er< 11, and 28<S<39. In this conditions, while incomming water was dropping into storage tank bottom, the mixture was minimized compared to other flow conditions and the negative buoyant jet trajectory dropped into the center of storage tank bottom. And the stable stratification was developed. Nomenclature D: Inlet port diameter(cm) E: Entrainment rate or entrainment function Fr: Densimetric Froude number g. Gravitational acceleration(m/sec^2) H: Height of single circular inlet port(cm) Q: Flow rate(GPH ) r: Radius of cuvature S: Dilution ratio T: Temperature of incoming water at centerline (℃) T_m: Temperature of incoming water, (℃) T_s: Temperature of initially stored water (℃) ΔT: Temperature difference with T_m-T_s U: The velocity of incoming water (m/s) U_m: The mean velocity of incoming water at centerline (m/s) <Greek symblos> α: Entrainment coefficient β: Volumetric expansion coefficient ρ_m: Density of incoming water, (kg/㎥) ρ: Density of initially stored water, (jg/㎥)

모형 수평 축열조의 열원 유입구 형상에 관한 실험적 연구

박이동,정운철,안성호 成均館大學校 科學技術硏究所 1993 論文集 Vol.44 No.2

The flow around a heat source rises through an inlet port of heat source and transports the thermal energy from heat source to storage water. The improvement of the geomtry of inlet port of heat source is able to enhance the thermal efficiency of horizontal storage tank and the rapidity of supplying thermal storage energy from heat source to load. In this experimental study, there are six kinds of thermal storage tank which have the different geometry of inlet port of heat source each other. This study is for choosing the tank which has the best thermal efficiency and the most rapid thermal flow in the same experimental conditions. Results have been obtained through this study as the following. Integrated tank system, specially round type, in this case, heat source is directly interposioned in the inlet port of heat source-the geometry of inlet port heat source-has the best thermal efficiency and the most rapid thermal flow. Therefore integrated tank system, specially round type, is suitable to store the sensible heat from the heat source efficiency and to supply thermal energy to load rapidly.

합성 염료 수용액에 대한 다공성 Ceramic의 흡착 특성

권이열,윤동준,지형하 漢陽大學校 環境科學硏究所 1989 環境科學論文集 Vol.10 No.-

소수성으로 처리한 다공성 ceramic의 흡착특성을 연구하고자 합성 염료수용액을 회분식으로 실험하였다. 다공성 ceramic의 양(1,2,3,4,5g) 및 particle size(30∼50, 50∼100, 100∼200mesh), temperature(25,30,40℃) 및 흡착시간(0.5,1,2,3hr)의 변화에 따라 탈색율(decoloring efficiency)을 관찰한 결과, 염기성 염료(methyl violet 2B)가 99.6%로 가장 좋았으며, 직접 염료(congo red)가 95.3%, 각 염료의 혼합용액(acid orange Ⅱ, nylon fast blue R, congo red, dark green 2B, methy, violet 2B, cationic red 7BN의 동일비율 혼합)이 70.5%, 산성 염료 (acid orange Ⅱ)가 62.8%인 순서로 나타났다. 흡착제의 양 및 흡착시간, 온도증가에 비례하였으며, particle size가 작을 수록 증가하였다. 이들 조건중 pH의 영향이 가장 크며, pH가 높을수록 흡착효율이 증가하였다. 다공성 ceramic의 염료 조색단(auxochrome)에 대한 친화성은 술폰산기(-SO₃H)에 비해 아미노기(-NH₂)가 우수한 것으로 나타났다. 전반적인 흡착경향은 염기성염료와 직접염료는 Freundlich 등온흡착식에 적합하게 일치되었으며, 산성염료는 Henry형에, 혼합용액은 Langmuir형과 유사한 상관도를 보였다. 재생이 가능한 장점으로 보아 흡착제로 유용하게 사용할 수 있을 것으로 전망된다. The adsorptive properties of porous ceramics(made of sam-wha ceramic co.) in aqueous dyes solution was performed by batch test. The measured decoloring efficiencies were 99.6% for methyl violet 2B, 95.3% for congo red, 70.5% for mixed dyes, 62.8% for acid orange II under various reaction conditions-amounts of porous ceramic, paricle size, temperature and pH. The decoloring efficiency was severely affected by pH, and increased at higher pH. The adsorption rate improved by enhancing adsorption time, amounts of porous ceramic and temperature, increased as the particle size down. Porous ceramics had an affinity for nitro-radical(-NH₂), but not sulphonic-radical(-SO₃H). It was suggested that the porous ceramics was a useful adsorbent because of regenerable merit.

쥐노래미 Hexagrammos otakii의 난소 발달단계에 따른 간세포의 활성변화

정의영,강희웅,이근우 한국어류학회 2002 韓國魚類學會誌 Vol.14 No.2

암컷 쥐노래미(Hexagrammos otakii)의 생식소중량지수(GSI)는 9월에 증가되기 시작하여 11월에 최대에 도달하였다. 쥐노래미의 생식주기는 연속적인 5단계로 나눌 수 있었다: 성장전기(7월), 성장후기(7~8월), 성숙기(9~10월), 완숙 및 산란기(9~12월), 회복 및 휴지기(12~6월). 간중량지수(HSI)의 월변화는 GSI변화와 유사한 경향을 보였다. 성장전기에 다량의 지방적과 글리코겐 입자들이 간세포내에 존재하였다. 특히, 이 시기에 간세포는 헤마톡실린에 약하게 염색되었다. 성장후기부터 성숙기에 간세포의 크기는 증대되었으며 간세포질내 글리코겐과 지방적들의 양은 감소된 반면, 호염기성 물질 축적이 증가하였다. 산란기부터 회복 및 휴지기에는 간세포내에 호염기성 물질 축적이 감소된 반면, 다량의 지방적과 글리코겐입자가 축적되었다. 간세포내의 총단백질, 총지질 및 글리코겐함량(%)의 최대값은 각각 9월(성숙기), 7월(성장전기), 3월(휴지기)에 나타났다. The GSI in the female greenling Hexagrammos otakii, began to increase in September and reached a maximum in November. The reproductive cycle of the greenling can be divided into five successive stage: early-growing stage(July), late- growing stage(July to August), mature stage(September to October), ripe-and-spent stages(September to December), and recovery-and-resting stages(December to June). Monthly changes in the HSI showed a similar pattern with those of the GSI. In the early- growing stage, a lot of lipid droplets, and glycogen particles were present in the cytoplasm of hepatocytes. Especially, the cytoplasm of hepatocytes were weakly stained with hematoxylin. In the late- growing to mature stage, hepatocytes became large, and the amount of glycogen and lipid droplets in hepatocytes gradually decreased, while basophilic substance increased. In the spawning to recovery-and-resting stages, basophilic substances decreased in the cytoplasm of hepatocytes. However, lots of lipid droplets and glycogen were stored in the hepatocytes. The maxium total protein, lipid and glycogen contents(%) in the hepatocytes appeared in September(mature stage), July(early-growing stage) and March(resting stage), respectively.

오스트리아 行政節次法(2)

金伊烈 中央大學校 法學硏究所 1981 法學論文集 Vol.6 No.-