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레이들 내 와류 형성에 미치는 노즐 편심도의 영향에 관한 수치해석
최윤석,서준원,이진형 ( Yun Suk Choi,Jun Won Suh,Zin Hyoung Lee ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.1
N/A In steel making process, vortices may develope during the tapping of steel from ladle to tundish which take down undesired slag in their core. If the slag is dispersed finely in the melt, it can flow down further into the mold and finally becomes inclusion in the steel. Therefore, the suppression of the vortex formation is very important in steel making process. One of the methods used to suppress the vortex formation is using nozzle eccentricity. In this study the flow field and the free surface change during the drainage of melt from ladle were analyzed numerically with a commercial FDM package, CFX-F3D, to find out the effect of nozzle eccentricity. This calculation results showed the suppression effect of vortex formation by nozzle eccentricity in agreement with experiment. (Received November 14, 1997)
PV-BESS 시스템의 적정 PCS, 배터리용량 산정에 따른 최적 운영에 관한 연구
최윤석(Yun Suk Choi),나승유(Seung You Na) 대한전기학회 2018 전기학회논문지 Vol.67 No.9
In December 2017, the government announced plans to increase the current proportion of renewable energy from 7% to 20% by 2030 through a plan called the Renewable Energy 3020 Implementation Plan. Therefore, the demand for installation of photovoltaic(PV), wind turbine(WT) and battery energy storage system(BESS) is expected to increase. In particular, the system combined with energy storage system(ESS) is expected to take up a large portion since PV and WT can receive high renewable energy certificates(REC) weights when combined with ESS. In this study, we calculate the optimal capacity of the power conditioning system(PCS) and the BESS by comparing the economical efficiency and maximize the efficiency of the PV-BESS system in which the PV and the BESS are connected. By analyzing the system marginal price(SMP) and REC, it maximize profits through application of REC weight 5.0 and optimal charge-discharge scheduling according to the SMP changes.
일차성, 이차성 그리고 삼차성 부갑상선 기능 항진증 환자의 수술 후 임상결과: 서울대학교 병원에서의 14년 경험
최윤석 ( Yun Suk Choi ),이규언 ( Kyu Eun Lee ),박귀원 ( Kwi Won Park ),노동영 ( Dong Young Noh ),오은미 ( Eun Mee Oh ),최준영 ( June Young Choi ),윤여규 ( Yeo Kyu Youn ),오승근 ( Seung Keun Oh ),구도훈 ( Do Hoon Koo ) 대한임상종양학회 2011 Korean Journal of Clinical Oncology Vol.7 No.1
목적: 일차성, 이차성, 삼차성 부갑상선 기능 항진증은 각각 원인과 치료방법 그리고 임상 경과가 서로 다르지만 부갑상선 절제술이 표준치료로 알려져 있다. 본 연구에서는 각각의 부갑상선 항진증의 수술 전후의 임상적 변화를 알아보고 부갑상선 절제술의 의미를 재고 해보고자 하였다. 방법: 1996년부터 2009년까지 총 126명이 서울대학교 병원에서 부갑상선 절제술을 시행 받았으며 각각 일차성 96명, 이차성 24명, 삼차성 6명이었다. 환자들의 나이, 성별, 생화학적 검사, 수술방법, 병리학적 검사 결과를 전자 의무기록을 통해 후향적으로 분석하였다. 결과: 모든 세 군의 환자에서 혈청 칼슘, 부갑상선 호르몬, 이온화 칼슘이 수술 전보다 호전을 보였다. 이차성 환자군은 다른 두 군에 비해 수술 전, 후의 부갑상선 호르몬이 높았으며(p<0.001, p=0.036), 수술 후 지속적인 부갑상선 기능 항진증(30.4%) 및 일과성 저칼슘혈증(87.5%)도 다른 두 군에 비해 많이 발생하였다.(p< 0.001) 일과성 저칼슘혈증의 대부분(90.4%) 은 6개월 이내 회복 되었다. 이차성 환자에서 부갑상선 아전 및 전 절제술을 시행 받은 경우 수술 후 일과성 저칼슘혈증이 많이 나타났으나(71.4%), 제한적 절제술을 시행 받은 경우 지속적 부갑상선 기능항진증이 더 많이 나타났다.(50%) 결론: 부갑상선 절제술은 생화학 검사상의 호전을 위한 치료 방법으로 추천될 수 있으며, 이차성에서는 제한적 절제를 하는 경우 지속적 부갑상선 항진증의 빈도가 더 높으므로 부갑상선 아전 및 전 절제술을 시행해야 한다. Purpose: Primary hyperparathyroidism(PHPT), secondary hyperparathyroidism(SHPT) and tertiary hyperparathyroidism(THPT) are different in the cause, treatment and prognosis. However the parathyroidectomy has been an efficient treatment in all hyperparathyroidism groups. A single institution`s 14 year experience of surgical treatment was analyzed to investigate perioperative changes of clinical characteristics and reconsider the value of parathyroidectomy as the treatment option. Materials and Methods: From 1996 to 2009, 126 patients underwent parathyroidectomy at single institute and the number of patients with PHPT, SHPT and THPT were 96, 24 and 6 retrospectively. The electronic medical records of age, sex, biochemical analysis, operative method, and pathologic results were reviewed retrospectively. Results: Postoperative calcium (Ca), parathyroid hormone (PTH), ionized calcium (iCa) levels were improved definitely than preoperative Ca, PTH, iCa level in all three groups. Pre and postoperative PTH level in SHPT was higher than in PHPT and THPT(p<0.001, p=0.036) and postoperative persistent PTH increased status were more common in SHPT.(30.4%, p<0.001) Postoperative temporary hypocalcemia was more common in SHPT(87.5%, p<0.001), almost of them (90.4%) were recovered in 6 month. In SHPT group, temporary hypocalcemia were more common in subtotal or total parathyroidectomy group than in limited resection group (94.1%) but persistent iPTH increase were more common in limited resection group (50%). . Conclusion: Parathyroidectomy is highly recommended to improve biochemical laboratory findings in patients with hyperparathyroidism. And in SHPT, subtotal or total parathyroidectomy is more appropriate surgical method for reducing the high incidence of persistent hyperparathyroidism.
최윤석 ( Yun Seok Choi ),임원석 ( Won Suk Lim ),진상윤 ( Sang Yun Jin ),이준호 ( Joon Ho Lee ),이승호 ( Seung Ho Lee ),최종순 ( Jong Sun Choi ),김어진 ( Eo Jin Kim ),이애영 ( Ai Young Lee ) 대한피부과학회 2011 대한피부과학회지 Vol.49 No.4
Atypical fibroxanthoma is an uncommon spindle cell tumor that has a clinically benign course despite the presence of bizarre xanthoma cells. A 90-year-old female presented with a 2-month history of an ulcerative plaque on the right cheek. The initial punch biopsy revealed a benign histological appearance with prominent xanthomatous cells, but the specimen excised afterwards showed malignant features with a spindle and epithelioid cell proliferation with pleomorphism and atypia. The tumor cells stained positively for vimentin and CD68, they were partially positive for CD99 and CD10 and they were negative for CD34, S100, p63, desmin and actin. We report here on a case of atypical fibroxanthoma masquerading as xanthogranuloma. (Korean J Dermatol 2011;49(4):360∼364)
최윤석 ( Yun Seok Choi ),임원석 ( Won Suk Lim ),진상윤 ( Sang Yun Jin ),이준호 ( Joon Ho Lee ),이승호 ( Seung Ho Lee ),이애영 ( Ai Young Lee ) 대한피부과학회 2011 대한피부과학회지 Vol.49 No.9
Fixed drug eruption is a distinctive and clinically recognizable entity that is characterized by well-demarcated erythematous plaques recurring in exactly the same sites as on previous occasions. Unlike the pigmenting form of fixed drug eruption, nonpigmenting fixed drug eruption leaves no pigmentation when it resolves. We now report the case of a 44-year-old man who presented with diffuse ill-defined erythematous patches on both hands, feet and lower legs with a burning sensation, which is considered an atypical manifestation for fixed drug eruption. The patient had a history of similar skin lesions developing after medications on the corresponding regions. The patch test with suspected drugs showed negative reactions on both lesions and unaffected sites. The lesions were reproduced on the oral provocation test with codeine and resolved without pigmentation. The patient was diagnosed with nonpigmenting fixed drug eruption due to codeine. (Korean J Dermatol 2011;49(9):822~825)
최윤석(Choi Yun Suk),전시현(Jeon Si Heon) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, we studied the optimized design of roof structure to be separable roof structure. Also, the design have to satisfy with the GM/RT 2100" missile protection tests to verify the safety of railway vehicle structure. The separable roof structure design could have easier assembly process than whole roof structure in case of the interior outfitting and so on. Optimized design have to have as good as whole roof structure about results from the structure analysis. We studied separable roof structure to be optimized along with GM/RT 2100. The separable roof structure showed that the results have the same level of structure analysis.
백반증을 동반한 아토피피부염 환자에서 Cyclosporine 투여 후 백반증이 호전된 증례
최윤석 ( Yun Seok Choi ),임원석 ( Won Suk Lim ),진상윤 ( Sang Yun Jin ),이준호 ( Joon Ho Lee ),이승호 ( Seung Ho Lee ),이애영 ( Ai Young Lee ) 대한피부과학회 2012 대한피부과학회지 Vol.50 No.2
Vitiligo is an acquired cutaneous disorder of pigmentation with no definite etiology. Although there are a number of treatment modalities including phototherapy, topical corticosteroids and topical immunomodulators, few studies on the effect of systemic cyclosporine for the treatment of vitiligo have been conducted. We have experienced the improvement of vitiligo lesions after 8 months of systemic administration of cyclosporine (2.5~3.3 mg/kg/day) in a patient with vitiligo and atopic dermatitis. We believe this case report warrants further investigations of cyclosporine for the treatment of vitiligo in terms of mechanisms and clinical outcomes as well. (Korean J Dermatol 2012;50(2):159~162)
최윤석(Yun-Suk Choi),곽태호(Tea-Ho Kwak),김구식(Ku-Sik Kim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
In recent carbody design of rolling stocks the development of a new carbody structure rather than designing the carbody structure by applying a proven new way to design the carbody structure has been applied. Structural requirements of the carbody being equal the same applies to the carbody structure means that it is possible to design a carbody structure. By kinematic envelope & speed and the environment etc. the carbody design is in progress. Accordingly if all conditions are the same as the existing carbody structure by the same criteria is that you can go get the same. Rather than developing a new carbody structure carbody structure by applying proven that safety is secured is made possible. Proven standard model of the carbody structure of rolling stocks to secure a new carbody design has made it possible to apply. In addition the size of the different carbody but structural requirements are the same body design is easier to be expected. In this paper a model standard carbody of rolling stocks is chosen and of a new carbody design that can be applied to the carbody design will attempt to demonstrate the case.