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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,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, ${\pm}1.0.$.
최한석(Han-Suk Choi),이승건(Seung-Keon Lee),도창호(Chang-Ho Do) 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.3
On April 20, 2010, a well control event allowed hydrocarbon (oil and gas) to escape from the Macondo well onto Deepwater Horizon (DWH), resulting in an exploration and fire on the rig. While 17 people were injured, 11 others lost their lives. The fire continued for 36 hours until the rig sank. Hydrocarbons continued to flow out from the reservoir through the well bore and blowout preventer (BOP) for 87 days, causing an unprecedented oil spill. Beyond Petroleum (BP) and the US federal government tried various methods to prevent the oil spill and to capture the spilled oil. The corresponding responses were very challenging due to the scale, intensity, and duration of the incident that occurred under extreme conditions in terms at pressure, temperature, and amount of flow. On July 15, α capping stack, which is another BOP on top of the existing BOP, was successfully installed, and the oil spill was stopped. After several tests and subsea responses, the well was permanently sealed by a relief well and a bottom kill on September 19. This paper analyzes the subsea responses and engineering efforts to capture the oil, stop the leaking, and kill the subsea well. During the investigation and analysis at subsea responses, information was collected and data bases were established for future accident prevention and the development of subsea engineering.
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.
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.