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Expansion Analysis of Subsea Pipe-In-Pipe Due to High Temperature and High Pressure Product
HANSUK CHOI(최한석),HYUN-MO SON(손현모),SI-YOUNG KIM(김시영) 한국해양공학회 2002 韓國海洋工學會誌 Vol.16 No.5
본 논문은 고온 고압의 유류 수송용 이중배관의 팽창에 대한 해석적 방법에 대한 결과고찰과 해석, 그리고 설계시 응용이 가능한 현상에 대해 논하였다. 고온의 유류수송시 온도를 유지할 목적으로 내부의 수송 배관과 외부의 케이싱 배관사이에 절연체가 쓰여진다. 이런 이중배관의 팽창을 조사할 수 있는 간단한 해석적 방법이 개발되었다. 본 논문에서는 온도의 분포, 압력, 토질의 저항, 수송배관과 케이싱배관과의 상호작용 등이 고려되어졌으며, 이 해석적 방법은 심해의 이중배관 해석에 적합하게 개발되었다. 계산의 결과 분석에서 고온의 영향이 고압보다 현저한 것이 밝혀졌다.
최한석,하영구,Choi, Han-Suk,Ha, Young-Gu 대한화학회 1961 대한화학회지 Vol.5 No.1
Ion exchange procedure was studied for the separation of thorium from the acidic solution obtained by means of decomposition of monazite with alkali solution. Present cation exchange method consists of adsorption of cations from the sample solution (ca. 0.6N HCl acidic) onto Amberlite IR-120 resin, elution of all of the rare earth cations with 700 ml. of 2N Hydrochloric acid, and recovery of the thorium by elution with 200ml. of 6N sulfaric acid. Thorium recovery by the ion-exchange method mentioned above, was quantitative, and it is concluded that this ion-exchange method may be used not only for industrial separation of thorium from rare earths but also for quantitative determination of thorium with relative error, ${\pm}1.0.$.
稀土類中 토리움의 分離定量 에 관하여 (第一報) 過酸化水素法에 對한 檢討
최한석,박순자,Choi, Han-Suk,Park Soon Za 대한화학회 1957 대한화학회지 Vol.4 No.1
On the performance of the hydrogen peroxide method for Th-determination we encountered some difficulties, namely the formation of the insoluble matter occured in the nearly neutral solution after evaporation. We carried out the Th-determination in the mixture of the Th and some kind of the rare earth, and found that the insoluble matter was not formed in case of the mixture of Th and some kind of rare earth, but formed in case of Monazite. The formation of the insoluble matter in the case of Monazite sand, however, could be avoid by using the beaker instead of the evaporating dish and by adding the water repeatedly before it was completely evaporated to dryness.
최한석(HAN-SUK CHOI) 한국해양공학회 2008 韓國海洋工學會誌 Vol.22 No.4
General aspects of deepwater petroleum exploration and production were identified and related technical challenges were addressed. Historical perspectives, insight, processes, and engineering applications are reviewed to enhance the design capability of the domestic offshore industry. The technical challenges and unique aspects of deepwater exploration and production were identified. The assessment of deepwater exploration, drilling, and production systems is a key stage for performing the front end engineering design (FEED). The global trends in deepwater development, including the feasibility for Korea, were reviewed.
Mechanical Design of Deepwater Pipeline Wall Thickness Using the Recent Rules
HAN-SUK CHOI(최한석) 한국해양공학회 2002 韓國海洋工學會誌 Vol.16 No.6
This paper presents a mechanical design of the deepwater pipeline wall thickness using the recent design rules. Characteristics and limitations of the new codes were identified through a case study design in the Gulf of Mexico. In addition to the ASME, API, and DNV codes, the code of federal regulations (CFR) was also utilized in the design. It was found that conservatism still exists within the collapse prediction for water depth greater than 1500m. Comparision of the results from DNV and API codes were presented.
최한석(Han-Suk Choi) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
An explosion on April 20, 2010 aboard the Deepwater Horizon, a drilling rig working on a well for the oil company BP in 1,525m water depth below the surface of the Gulf of Mexico (GOM), led to the largest oil spill in history. After a series of failed efforts to plug the leak, the leaking well was capped on July 15, at least temporarily, marking the first time in 86 days that oil was not gushing into the GOM. This paper describes the causes and results of oil spill.
보문 : 장수버섯 균사체가 배양된 옻피의 이화학적 특성 및 생리활성
최한석 ( Han Seok Choi ),김보현 ( Bo Hyun Kim ),여수환 ( Soo Hwan Yeo ),정석태 ( Seok Tae Jeong ),최지호 ( Ji Ho Choi ),박효숙 ( Hyo Suk Park ),김명곤 ( Myung Kon Kim ) 한국균학회 2010 韓國菌學會誌 Vol.38 No.2
The contents of proximate composition, free amino acids and phenolic acids in the Fomitella fraxinea cultivated-Rhus verniciflua stem bark(FRVSB), and its adipogenesis effect were investigated. The proximate composition(%) of FRVSB was as follows: moisture(7.64), ash(6.30), crude fat(3.86), crude protein(3.59) and sugar(not detected); while Rhus verniciflua stem bark(RVSB) contained 1.64, 8.09, 7.28, 6.48 and 5.39, respectively. The total free amino acids concentration was 97.41 mg% in FRVSB and 71.91 mg% in RVSB. Phosphoserine(55.06 mg%), ammonia(17.84mg%) and aspartic acid(6.05mg%) were predominant amino acids. The content of total phenolic acids was 422.89 ppm/ in ethanol extract and 283.86 ppm (in water extract), with syringic and gallic acid as the main component. The FRVSB extracts showed a potent free radical scavenging activity for DPPH(2,2-diphenyl-1-picrylhydrazyl hydrate) with IC50 of 28.54 μg(EtOH) and 54.70 μg(water), respectively, whereas IC50 value of gallic acid was 1.84 μg. The protective effect of both ethanol and water extract the extracts against UV-induced oxidative stress in NIH3T3 was observed. The water extracts of FRVSB may promote adipogenesis in 3T3-L1 cells.