전신면역억제를 지속한 각막윤부이식술 수여안의 중기 임상결과

한의석,인연석,위원량,이진학,김미금,Eui Seok Han Youn Seok In Won Ryang Wee Jin Hak Lee Mee Kum Kim 대한안과학회 2007 대한안과학회지 Vol.48 No.2

Purpose: To investigate the midterm outcome of limbal transplantation combined with continuous systemic immune suppression. Methods: The medical records of 15 eyes in 14 patients who underwent limbal transplantation were reviewed retrospectively. All had been followed up for 6 months or more. Limbal transplantation was performed with 360 degrees of 0.19 mm partial corneal trephined tissues, accompanied with transient amniotic membrane transplantation. The procedure was accomplished with systemic cyclosporine or mycophenolate. We defined complete success as neither rejection nor epithelial defect; partial success as partial conjunctival ingrowth and neovascularization without epithelial defect; and graft failure as persistent epithelial defect or total conunctivalization with neovascularization. Results: Mean age at surgery was 45.1 years. 9 eyes yielded complete success, 2 had partial success, and graft failure occurred in 4 on an average of 23.4 months postoperatively. Success including complete and partial success showed 67% incidence (4 of 6) of chemical burn, 33% (1 of 3) with Stevens-Johnson syndrome, and 100% (6 of 6) experienced another intractable ocular surface disease. Of 10 eyes (67%), which experienced graft rejection in an average of 2.7 months; 4 demonstrated full recovery with oral corticosteroid and enhanced immunosuppression, 2 presented with chronic graft rejection, and the other 4 ended in graft failure. Conclusions: Total success rate was revealed as 73.3% for on average 23.4 months in limbal transplantation with continuous systemic immune suppression, utilized for chronic intractable ocular surface disease.

방사상각막절개술을 받은 고도근시안의 인공수정체 도수 계산

한의석,이진학,Eui Seok Han,M,D,Jin Hak Lee,M,D,Ph,D 대한안과학회 2006 대한안과학회지 Vol.47 No.8

Purpose: To elucidate a proper method of intraocular lens (IOL) power calculation in highly myopic eyes with previous radial keratotomy (RK). Methods: Five post-RK-surgery eyes with pre-RK-surgery myopia over -10.0 diopters (D) were studied retrospectively. The keratometric values obtained via the clinical history method, the contact lens over-refraction method, conventional keratometry, and Orbscan II were compared to the true keratometric value calculated retrospectively using the SRK/T formula. Results: The mean pre-RK-surgery refractive power was -19.35±5.86D (-14.50 ~ -29.50D) and cataract surgery was performed on average 16.6 years after RK. The true keratometric value was closest to that estimated by the contact lens over-refraction method in 1 eye and to the flatter keratometric value between Sim K and the 3mm zone mean Pwr obtained with axial keratometric power map of Orbscan II in 4. Conclusions: The flatter keratometric value between Sim K and the 3mm zone mean Pwr from Orbscan II was closest to the true post-RK-surgery keratometric value of the central cornea.

디지털 무산동 영상의 변환을 이용한 망막신경섬유층 결손의 발견

한의석,박기호,김태우,김동명,Eui Seok Han,M,D,Ki Ho Park,M,D,Tae Woo Kim,M,D,Dong Myung Kim,M,D 대한안과학회 2006 대한안과학회지 Vol.47 No.5

Purpose: To evaluate the efficiency of digital retinal nerve fiber layer (RNFL) photographs converted from a non-mydriatic digital fundus camera for detecting RNFL defects. Methods: Ninety-five eyes were evaluated with both a non-mydriatic digital fundus photograph and a digital RNFL photograph by two glaucoma specialists independently. The red-free, monochrome modified digital fundus photograph was acquired from non-mydriatic digital fundus photographs using Photoshop 7.0. Whether a localized wedge-shaped or diffuse RNFL defect existed or not was evaluated on a non-mydriatic digital fundus photograph and a modified digital fundus photograph, and inter- and intraobserver agreement were also evaluated. Regarding the use of digital RNFL photographs as a standard method, we calculated the sensitivity, specificity, and positive and negative predictive values of the two types of photographs. Results: Interobserver agreement (Cohen`s kappa values) about localized RNFL defects observable on digital RNFL photographs, non-mydriatic digital fundus photographs, and modified digital fundus photographs were 0.749, 0.634, and 0.793, respectively, but all were 0.417 or less with regard to diffuse RNFL defects. Regarding localized RNFL defects, the sensitivity, specificity, and positive and negative predictive values of modified digital fundus photographs were 85.7%, 95.5%, 85.7% and 94.1%, respectively, showing superiority to those of non-mydriatic digital fundus photographs. But, in cases of diffuse RNFL defect, the sensitivity and specificity of modified digital fundus photographs were 60.0% and 97.8%, respectively, indicating no superiority to non-mydriatic digital fundus photographs. Conclusions: The localized RNFL defect can be detected more efficiently with modified digital fundus photographs than non-mydriatic digital fundus photographs, but the diffuse RNFL defect cannot.

안과 전자의무기록의 적용과 만족도 조사

한의석,김성준,Eui Seok Han,Seong Joon Kim 대한안과학회 2006 대한안과학회지 Vol.47 No.5

Purpose: To introduce the electronic medical record (EMR) system used in the department of ophthalmology and to report improvements to be made and user satisfaction. Methods: The EMR, used since October 15, 2004, was shown in several figures. Some problems were revealed on the figures and improved. The satisfaction results for the EMR`s efficacy and quality of eye description compared to the paper chart were obtained from a questionnaire of twenty-one ophthalmologic residents who had at least 6 months of experience with EMR using 5-point Linkerd scale. Results: The EMR was shown to be useful in ophthalmology. Problems were solved by resizing the pictures automatically, introducing a convenient picture input method using an LCD tablet monitor system, and by minimizing the automatic fill-in system in ocular examination records. Twenty-one ophthalmologic residents replied, and the efficacy of EMR was satisfactory, scoring 2.6 on a 5-point Linkerd scale, whereas the complete and proper description of patients` information was unsatisfactory, scoring 3.6. Conclusions: The standardized ophthalmologic EMR and its easy and fast input device will improve ophthalmologists` satisfaction. EMR should be supplemented to make more proper and complete description of patients information.

전층각막이식술 후 봉합사 제거에 따른 각막곡률의 변화

한의석,위원량,이진학,김미금,Eui Seok Han,Won Ryang Wee,Jin Hak Lee,Mee Kum Kim 대한안과학회 2006 대한안과학회지 Vol.47 No.10

Purpose: To investigate the changes in corneal curvature after suture removal in penetrating keratoplasty. Methods: Forty-six patients who underwent penetrating keratoplasty without any other surgery which may affect on the corneal keratometric values were included, and their data were retrospectively reviewed. The mean follow-up was 11.5 months and the average donor-recipient size gap was 0.47 mm. Corneal curvature was estimated by the Simulated Keratometric index in 17 eyes with continuous sutures and in 29 eyes with interrupted sutures. The changes of corneal curvature were compared between suture-removed and not suture-removed groups. Results: In patients with continuous suture, the corneal curvature increased significantly from 47.12D at 5.1 months to 49.30D at 10.6 months after suture removal (p=0.002); in patients with interrupted suture, corneal curvature increased from 37.93D at 4.1 months to 42.44D at 11.5 months (p<0.001) after an average removal of 4.23 interrupted sutures, but it was not changed in each not suture-removed groups. Conclusions: Corneal curvature increased, on average, by 2.18D after one continuous suture removal and by 2.26D after an average of 2.12 interrupted sutures removal in penetrating keratoplasty. Prediction of keratometric value after removal of the sutures can be helpful to determine intraocular lens power in cataract surgery simultaneously combined with penetrating keratoplasty.

코우츠병의 임상분석 및 치료결과

한의석,정호경,허장원,김성준,유영석.Eui Seok Han. M.D.. Ho Kyung Choung. M.D.. Jang Won Heo. M.D.. Seong Joon Kim. M.D.. Young Suk Yu. M.D.. Ph.D. 대한안과학회 2006 대한안과학회지 Vol.47 No.3

Purpose: To evaluate the clinical characteristics and treatment result of Coats’ disease in children. Methods: Data on demographics, clinical presentation, and ocular findings were analyzed for 67 eyes of 67 patients with Coats’ disease by retrospective chart review. Among these, treatment results were analyzed from 56 eyes which had received local treatment or subretinal fluid drainage (SRFD). Treatment was considered successful when telangiectatic vessels or exudates had regressed after local treatment or when pupillary block glaucoma was treated or prevented after SRFD. Results: Mean age at diagnosis was 5.0 years (5 months-15 years) and 90% were males. 67% of retinal telangiectasias were located in the temporal. There were exudative retinal detachments in 46 (69%) eyes. Among them, SRFD was performed in 19 (28%) to treat or prevent pupillary block glaucoma. The mean age at diagnosis of patients that underwent treatment was 5.1 years. In 37 of 56 patients, 95% of retinal telangiectasias were regressed after primary local treatment, and 21 eyes (31%) underwent SRFD. Management of glaucoma was achieved after SRFD in 16 patients, and one more SRFD was needed after primary SRFD in 5 patients. Conclusions: In Coats’ disease, it is necessary to eradicate retinal telangiectasia with local treatment and to follow up carefully for secondary glaucoma, which can be treated with SRFD in cases of severe exudative retinal detachment.

북한의 철근콘크리트 슬래브교에 관한 연구

한의석,이인근,박선규,Han, Eui Seok,Lee, In Keun,Park, Sun Kyu 대한토목학회 2013 대한토목학회논문집 Vol.33 No.2

남북한이 상이한 사회적 규범체계 하에 분단국가로 장기화될수록, 건설기술에 대한 이론적 기술적 차이가 많이 발생하게 된다. 따라서 남북한이 화해의 국면에서 상호 교류시, 공동으로 사용하는 철근콘크리트 도로교의 성능수준도 명확히 차이가 발생한다. 이에 본 연구는 북한의 철근콘크리트 도로교 설계기준과 관련된 자료를 면밀히 비교 분석하고, 철근콘크리트 슬래브교에 대한 표준설계 제원과 사례를 토대로 구조해석을 수행했다. 특히 남북한의 설계트럭하중에 대하여 활하중 영향을 분석함으로써, 북한의 철근콘크리트 슬래브교에 대한 수준을 추정하였고, 이를통해 통행에 대한 안전성을 사전에 검토할 수 있도록 기초 연구를 수행하였다. 따라서 향후 남북한이 화해국면에 접어들어 교류가 활발히 진행되거나, 더 나아가 통일국가로 준비하는 단계에서, 공통의 철근콘크리트 도로교 설계기준을 작성하는데 기초자료로 활용될 것으로 기대한다. If North Korea continuously remains an isolated nation without social interaction with South Korea, the gaps in the theoretical and technological status in construction technology become greater between North and South Korea. Therefore if interactions between North and South Korea can be made, there will be significant improvement in infrastructure technological performance can be made(i.e., Reinforced Concrete bridges). This study was performed to compare and analyze data related to the design standards of North Korean RC bridges and to execute a structural analysis based on standard design specifications of RC slab bridges. Especially, basic study of analyzing the influences on design truck loads of North and South Korea was conducted for the purpose of predicting the performance of North Korean RC slab bridges and the safety levels of traveling vehicles in advance. It is expected that the results of this study can be used as fundamental data for the set-up of South-North RC bridge specification when South and North Korea enter a stage of cooperation and interaction between South and North Korea are actively pursued to prepare for reunification.

디지털 건설기준 BIM 적용을 위한 데이터 구조 분석 및 프레임워크 개발

한의석(Han, Eui-Seok),김희선(Kim, Hee Sun),지광습(Zi, Goang Seup) 대한토목학회 2022 대한토목학회 학술대회 Vol.2022 No.10

굴절형 신축이음장치의 피로내구성 평가

나준수,이타,한의석,성원규,이종석,Na, Jun-Su,Lee, Ta,Han, Eui-Seok,Sung, Won-Kyu,Lee, Jong-Suk 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 논문집 Vol.21 No.6

굴절형 신축이음장치는 신축이음장치의 문제점인 충격, 소음, 교체성, 교축직각방향 변위, 단차발생등을 보완하여 새롭게 개발되었다. 굴절형 신축이음장치는 주행면이 연속화 되어 충격이 작고 소음이 작은 것이 특징이다. 굴절형 신축이음장치의 거동 방식은 링크의 회전으로 신축 거동을 수행한다. 링크의 회전 거동 시 거동의 중심 축이되는 것은 볼트이다. 그러므로 굴절형 신축이음 장치는 볼트의 내구성이 매우 중요하다고 할 수 있다. 하지만 굴절형 신축이음장치의 볼트 내구성은 이론적, 실험적 검증이 부족한 실정이다. 본 논문에서는 볼트의 피로 내구성을 검증 하기 위해 신축량 300 mm 굴절형 신축이음장치 시험 시편을 제작 하였다. 제작된 시험 볼트 내부에는 볼트 전용 스트레인게이지를 설치하였다. 시험 방법은 KS F 4425를 준용 하여 시험 하였다. 200만회 피로 반복 시험을 통해 굴절형 신축이음장치 내부에 조립된 볼트의 피로 내구성을 확인 하였다. The refraction expansion joints have been newly developed by complementing the problems of shock, noise, replaceability, displacement in the direction perpendicular to bridge, vertical difference, which are problems of existing expansion joints. The Refraction expansion joints are characterized by continuous surfaces with small impact and low noise. The behavior of the Refraction expansion joints performs the bridge expansion behavior by rotation of the link. In the rotational behavior of the link, the bolt is the central axis of the behavior. Therefore, it can be said that the durability of the bolt is very important. However, the theoretical and experimental verification of the bolt durability of the Refraction expansion joint is lacking. In this paper, to verify the fatigue durability of the bolt, test specimens with a 300 mm Refraction expansion joint were fabricated. A strain gauge dedicated to the bolt was installed inside the manufactured test specimen bolt. The test method was applied in accordance with KS F 4425. The fatigue durability of the bolts assembled inside the diaphragm expansion joint was confirmed by the repeated fatigue test of 2,000,000 cycles.

조립식 교량 적용을 위한 콘크리트 방호울타리 연결부 개발 및 거동에 관한 연구

정호성(Jeong, Ho Seong),최진웅(Choi, Jin Woong),한의석(Han, Eui Seok),홍성남(Hong, Sung Nam),박선규(Park, Sun Kyu) 한국콘크리트학회 2011 한국콘크리트학회 학술대회 논문집 Vol.2011 No.11