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RISS 인기검색어
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- 저자 : 최영락 ( Young Rock Choi ) (검색결과 5 건)
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패턴 스캐닝 레이저과 기존 방법을 이용한 광응고술 후 가토 유리체강의 염증성 사이토카인
최영락,변익수,이승욱,신민규,이지은,엄부섭,Young Rock Choi,MD,PhD,Ik Soo Byon,MD,Seung Uk Lee,MD,Min Kyu Shin,MD,Ji Eun Lee,MD,PhD,Boo Sup Oum,MD,PhD 대한안과학회 2013 대한안과학회지 Vol.54 No.1
Purpose: To compare concentration of cytokines in the vitreous of rabbit eyes after photocoagulation using a short-pulse pattern scanning laser (PASCAL) or a conventional laser. Methods: Laser photocoagulation was performed using PASCAL (duration 0.02 seconds) in the right eyes and a conventional laser (duration 0.1 seconds) in the left eyes of 13 pigmented rabbits. To obtain ophthalmoscopically similar mild burns, power was adjusted during the photocoagulation. The rabbits were sacrificed at 1, 3 or 7 days after photocoagulation to investigate histological changes. Levels of interleukins (IL)-1β, IL-6, IL-8 and tumor necrosis factor (TNF)-α in the vitreous humors of ten rabbits were measured using enzyme-linked immunosorbent assay before treatment and at 1, 3 and 7 days after photocoagulation. Results: Histological changes were comparable between the two groups. IL-1β and TNF-α were not detectable. IL-6 did not change significantly. IL-8 increased at day 3 and day 7, but no significant difference was observed between the two groups (p>0.05). Conclusions: When ophthalmoscopically similar mild burn intensity was achieved, conventional and PASCAL treatments of rabbit eyes caused no difference in intravitreal concentration of inflammatory cytokines.
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역설계를 이용한 스마트폰 메인보드 커버의 스트립 레이아웃 설계에 관한 연구
최영락,김동욱,김세환,최계광,Choi, Young-Rock,Kim, Dong-Wook,Kim, Sei-Hwan,Choi, Kyu-Kwang 한국금형공학회 2015 한국금형공학회지 Vol.9 No.3
In order to design progressive die many processes are needed and it takes a lot of time to get a final product. In this study, we reduced design processes by using reverse engineering and studied on strip layout design which is the core part of die design. And we got a optimized strip layout design by CimatronE Die Design which is the 3D design program. In this strip layout design we obtained the more effective methode by using reverse engineering.
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3D 스캔을 이용한 콘센트 커버의 역설계 및 금형 개발
김동욱,최영락,신상은,김세환,최계광,한성렬,Kim, Dong-Wook,Choi, Young-Rock,Shin, Sang-Eun,Kim, Sei-Hwan,Choi, Kyu-Kwang,Han, Seong-Ryeol 한국금형공학회 2015 한국금형공학회지 Vol.9 No.1
Mold making and product manufacturing process was made by a die through a number of stages. Thereby, it takes a long period of time from the manufacture of mold until passed the products to consumers. However, it is not possible to meet the diverse desires purchasing of consumer. We made a 3D CAD Model aligned with product scan data using reverse engineering. Utilizing thereafter flow analysis to derive the optimal mold conditions, by applying the condition, and devised a mold fabrication process that is much shorter than the conventional process for fabricating a mold. In this study, the outlet cover to the product, it describes a process, as a result, it was confirmed that the number of steps can be shortened much more than the conventional process.
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단자 금형의 해석 및 프로그레시브 금형제작에 관한 연구
김동욱,최영락,김세환,최계광,Kim, Dong-Wook,Choi, Young-Rock,Kim, Sei-Hwan,Choi, Kyu-Kwang 한국금형공학회 2015 한국금형공학회지 Vol.9 No.3
The progressive die is processing methods that can improve the productivity for sequentially transferring while continuously producing in multiple processes. In this study was carried out the die analysis through the load analysis acting on the terminal die and sheet metal forming also the study was carried out with respect to optimized die design for the terminal die and progressive die manufacturing using the CimatronE Die Design.
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대퇴골두 무혈성괴사에서 시행한 핵심감압술 및 압박 골이식술
정광환 ( Kwang Hwan Jung ),장재석 ( Jae Suk Jang ),최영락 ( Young Rock Choi ) 대한고관절학회 2005 Hip and Pelvis Vol.17 No.4
목적: 대퇴골두 무혈성 괴사에서 핵심 감압술 및 압박 골이식술의 결과를 괴사부위의 크기와 위치에 따라 알아보고자 하였다. 대상 및 방법: 1996년 1월부터 2002년 9월까지 대퇴골두 무혈성괴사로 진단받고 핵심 감압술과 압박골이식술을 시행한 후 최소 2년이상 추시 가능했던 64명, 95예의 고관절을 대상으로 하였다. 남녀수는 각각 46명(71예), 18명(24예)였고, 나이는 평균 36.6(16~53)세였으며, 추시기간은 평균 43.3(24~95)개월이었다. 술 전 자기공명영상 소견상 괴사의 크기, 위치에 따른 수술 결과의 차이를 x2 -test와 Fisher`s exact test를 이용하여 비교 분석하였다(p<0.05). 결과: 임상적 진행은 21예(22.1%)에서 발생하였으며, 그 중 괴사의 크기가 50%이상인 경우가 17예(80.9%)였고, 모든 예에서 외측에 위치하였다. 방사선학적 진행은 51예(53.7%)에서 발생하였으며, 그 중 괴사의 크기가 50%이상인 경우가 28예(54.9%), 외측에 위치한 경우가 50예(98.0%)였다. 임상적 실패는 16예(16.8%)에서 발생하였으며, 그 중 괴사의 크기가 50%이상인 경우가 13예(81.3%)였고, 모든 예에서 외측에 위치하였다. 결론: 1. 괴사 부위의 크기는 클수록, 괴사 위치가 외측에 위치할수록 술 후 결과가 좋지 않았다. 2. 방사선학적 진행은 전체의 53.7%에서 발생하였으나, 인공 고관절 전치환술로 전환된 것은 16.8%에서만 발생한 것은 압박 골이식술(impaction bone graft)에 의해 대퇴골두가 강해진 것으로 생각한다. 3. 보다 더 긴 추시관찰이 필요하리라 생각한다. Purpose: To analyse the results of a core decompression and impaction bone graft according to necrosis size and location. Materials and Methods: Between Jan. 1996 and Sep. 2002, 64 patients (95 hips) who were followed up for a minimum of 2 years were studied. Forty-six (71 hips) were male and 18 (24 hips) were female. The mean age was 36.6 (16-53) years and the average follow up was 43.3(24~95) months. The surgical results were analysed using x2-test and Fisher`s exact test according to necrosis size and location. Results: Clinical progression was seen in 21 cases (22.1%), of which 17 cases had a lesion more than 50%. All 21 cases were located laterally. Radiologic progression was seen in 51 cases (53.7%), of which 28 cases had a lesion size involving more than 50%, and 50 cases were located laterally. Clinical failure was seen in 16 cases (16.8%), of which 13 cases had a lesion size involving more than 50%, and all 16 cases were located laterally. Conclusion: 1. The surgical results were worse when the lesion was larger and laterally positioned. 2. Radiologic progression was seen in 53.7% of cases, but conversion to total hip arthroplasty was seen in 16.8%, which was due to increased strength of femoral head. 3. To confirm these study results, longer follow up study is needed.
KCI
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