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황반하출혈에서 유리체강내 조직플라스미노겐 활성체 및 SF6 가스충전술, 유리체절제술의 치료효과
김민욱,임지원.Min Uk Kim. MD. Ji Won Lim. MD 대한안과학회 2010 대한안과학회지 Vol.51 No.11
Purpose: To evaluate the results of vitrectomy-assisted intravitreal tissue plasminogen activator (tPA) and SF6 gas injection in the treatment of submacular hemorrhage. Methods: Thirty-one eyes of 30 consecutive patients with submacular hemorrhages undergoing vitrectomy with intravitreal tPA (50 μg/0.1 ml) and SF6 gas injection and completed 12 months of follow-up were evaluated. Results: The mean duration of visual symptoms was 4.1 days. Submacular blood was completely displaced in all 31 eyes after surgery. The best corrected visual acuity (logMAR) improved to 0.56 ± 0.46 at 12 months from 1.15 ± 0.51 at baseline (P = 0.002). The most important factors related to visual acuity at the 12-month follow-up were the underlying etiology for the submacular hemorrhage and visual acuity 3 months after surgery (P = 0.003 and P = 0.000, respectively). The 12-month visual acuity was independent of age, gender, presence of vitreous hemorrhage, sub-ILM hemorrhage, baseline visual acuity, duration of symptoms, and the diameter of the submacular hemorrhage. No retinal detachment or re-submacular hemorrhage developed during the follow-up period. Conclusions: This surgical technique can effectively displace submacular hemorrhage without complications. The 3-month visual acuity appears to predict the 12-month visual acuity. The final visual acuity was associated with the primary etiology for the submacular hemorrhage. J Korean Ophthalmol Soc 2010;51(11):1459-1463
김민욱,이효경,강신희,신민철,Min Uk Kim,MD,Hyou Kyung Lee,MD,Shin Hee Kang,MD,Min Chul Shin,MD,PhD 대한안과학회 2012 대한안과학회지 Vol.53 No.4
Purpose: To report the results of anterior vitrectomy for obstruction of the aqueous outflow shunt by prolapsed vitreous strands after trabeculectomy. Case summary: Trabeculectomy was performed on a pseudophakic primary open angle glaucoma patient with uncontrolled intraocular pressure under maximum tolerable medical therapy. Three months after trabeculectomy, the bleb flattened and the intraocular pressure elevated. On gonioscopic examination, vitreous strands prolapsed through the iridectomy site obstructing the inner ostium. The maximum tolerable medical therapy and Nd:YAG laser vitreolysis were attempted, but the intraocular pressure was not controlled. Anterior vitrectomy was performed to remove the prolapsed vitreous strands. After anterior vitrectomy, the bleb regained filtering function and the intraocular pressure was stabilized. Conclusions: In a case with a prolapsed vitreous into the anterior chamber obstructing the outflow shunt of the aqueous humor after trabeculectomy, anterior vitrectomy showed therapeutic effects. J Korean Ophthalmol Soc 2012;53(4):602-606
마스크 착용 상태에서의 딥러닝 기반 수화 번역 알고리즘 설계
김민욱(Min Uk Kim),이수연(Su Yeon Lee),정예빈(Ye Been Jung),강정화(Jung Hwa Kang),김재현(Jae-Hyun Kim) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11
본 논문에서는 딥러닝을 기반으로 하는 마스크 착용 및 미착용 상태에서의 표정 분석과 한글 및 영어 수화 번역 알고리즘을 설계한다. 표정 분석 알고리즘은 convolutional neural networks (CNN) 구조로 모델을 구현하였고, open source computer vision (OpenCV)를 통해 얼굴을 감지하여 학습한다. 또한 수화 번역 알고리즘도 CNN을 사용하여 구현하고, OpenCV와 you only look once (YOLO)를 이용하여 손을 인식하여 학습한다. 성능 평가에선 각 동작 및 표정마다 1000장씩 test하여 OpenCV를 이용한 한글 자음 및 모음의 경우 95 %, YOLO를 이용한 영문 알파벳의 경우 object detection의 성능 지표인 mean average precision를 기준으로 97 %의 정확도를 얻는다.
vp tree에서 효과적인 k-Nearest Neighbor 검색 방법
김민욱(Min-Uk Kim),윤경로(Kyoungro Yoon) 한국정보과학회 2010 한국정보과학회 학술발표논문집 Vol.37 No.1C
vp tree는 기준점(vantage point)과의 거리를 기준으로 데이터베이스 내의 자료를 색인하는 자료구조이다. 멀티미디어 자료 검색에서 비슷한 정도는 객체간의 거리를 바탕으로 비교하고, vp tree 색인 구조는 이 과정을 내포하고 있기 때문에 최근 멀티미디어 검색 연구에서 많이 사용되고 있다. 검색 방법에는 query와 가장 가까운 대상을 찾는 Nearest Neighbor Search, 또는 query와 가까운 k등까지를 검색하는 k-Nearest Neighbor Search가 있다. 본 논문에서는 Content-based retrieval에서 최근 자주 사용되는 vp tree에서 효과적인 k-NNS 방법을 제안하고, 기존의 전형적인 k-NNS 방법과의 비교 실험 결과를 보인다.
고분자전해질 연료전지 분리판용 316L 스테인리스강의 표면특성에 미치는 질소 이온주입 효과
김민욱 ( Min Uk Kim ),김도향 ( Do Hyang Kim ),한승희 ( Seung Hee Han ),김유찬 ( Yu Chan Kim ) 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.11
The bipolar plates are not only the major part of the polymer electrolyte membrane fuel cell (PEMFC) stack in weight and volume, but also a significant contributor to the stack costs. Stainless steels are considered to be good candidates for bipolar plate materials of the PEMFC due to their low cost, high strength and easy machining, as well as corrosion resistance. In this paper, 316L stainless steel with and without nitrogen ion implantation were tested in simulated PEMFC environments for application as bipolar plates. The results showed that the nitride formed by nitrogen ion implantation contributed the decrease of the interfacial contact resistance without degradation of corrosion property. The combination of excellent properties indicated that nitrogen ion implanted stainless steel could be potential candidate materials as bipolar plates in PEMFC. Current efforts have focused on optimizing the condition of ion implantation.