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이석현,김재훈,김지택,전연숙,김재찬,Seok Hyun Lee,Jae Hoon Kim,Jee Taek Kim,Yeoun Sook Chun,Jae Chan Kim 대한안과학회 2008 대한안과학회지 Vol.49 No.7
Purpose: To report a case of ocular surface reconstruction using nasal and oral mucosa auto grafts on a man whose ocular surface was deformed by a chemical burn. Case summary: A 48-year-old man was injured when his right eye was exposed to alkali solution. He underwent fifteen operations, including amniotic membrane auto grafts and fornix reconstructions. However, his right eye still suffered from symble pharon, drying, corneal neovascularization, and erosion. We performed ocular surface reconstruction with free autologous nasal and oral mucosal transplantation and amniotic membrane graft. By one month after surgery, his eye showed no evidence of symble pharon or fibrovascularization recurrence on the cornea or conjunctiva. By six months after surgery, his ocular surface had stabilized. Conclusions: Ocular surface reconstruction with free autologous nasal and oral mucosal transplantation is a useful method on eyes that are injured by chemical burns. J Korean Ophthalmol Soc 49(7):1177-1182, 2008
인천광역시 원도심 공원녹지 기본계획 현황 및 이용 평가
이석현,김하늘,곽동화,Lee, Seok-Hyun,Kim, Haneul,Kwack, Dongwha 인천대학교 도시과학연구원 2018 도시과학 Vol.7 No.2
The purpose of this study is to review and evaluate the proper planning for 2030 Incheon Urban Parks & Green Space Master Plan. Some of the plans are aimed at multiple small districts within the city's old town, as local governments are planned to be sub-subsidized by Incheon Metropolitan City. However, these plans have become simple plans for each district and therefore find it difficult to collect from the perspective of the using system of the residents who are directly used. First, the construction of the urban park and green space network requires the construction of a service using system that can be felt by the users. Second, the basic idea of each district planned as the detailed strategy of the master plan should be planned through consultation with nearby the district. Third, specific targets and directions for the urban park and green space plan through the urban development project are needed.
동결-해동-원심분리를 이용한 무세포 돼지각막의 특성 연구
이석현,전연숙,김재찬.Seok Hyun Lee. MD. Yeoun Sook Chun. MD. Jae Chan Kim. MD. PhD 대한안과학회 2011 대한안과학회지 Vol.52 No.1
Purpose: To develop a new decellularization technique of porcine cornea using freezing-thawing-centrifugation (FTC) and to examine the characteristics of acellular porcine cornea (APC) for xenograft material. Methods: Two-hundred micrometer thickness porcine corneas were decellularized with DNase/RNase, followed by 3 freezing-thawing-centrifugations (FTC, group 1), lyophilized FTC-APC (group 2), and chemical enzyme treated APC (CE-APC, group 3). Histologic evaluation to examine cells and collagen matrix, comparison of transparency, and cultivation to determine the viability of stromal cells was performed in fresh porcine cornea and 3 experimental groups. Results: Decellularization occurred successfully in all experimental groups. Decellularization was confirmed by H&E staining and cultivation. Transparency of group 1 was similar to the normal porcine cornea but transparency of group 2 and group 3 was decreased. Collagen fibers of CE-APC (group 3) were not as well arrayed as FTC-APC (group 2). Conclusions: Acellularity of porcine cornea was successfully achieved by the FTC method with preservation of the cornea stroma. Novel decellularized porcine cornea can be considered as xenogeneic material for corneal transplantation. J Korean Ophthalmol Soc 2011;52(1):86-92
이석현 ( Seok-hyun Lee ) 중앙대학교 예술문화연구원 2016 예술문화융합연구 Vol.4 No.-
The purpose of this open space design is to adapt a communication design concept to a regeneration of an old town that has a common space and a emptiness for a neighborhood activity. The place is located within the entrance to the site called by 'Ma-seok market' in Hwa-do, Namyangju City. The design plan has two spatial compositions. ① Maseok market on a crossroad is focused on the creation of the community space for merchants and residents. Especially, the open space for the common place is formed into design structures using regional sources-colors, materials, and shapes. ② The market place is designed for a daily function such as a walk 'promenade' and service facilities. Designs practically have been applied installations such as lights, benches, paving, fences, and etc to accommodate residents' needs and demands.
이석현(Lee, Seok-Hyun),채진해(Chae, Jin-Hae) 대한건축학회 2013 대한건축학회논문집 Vol.29 No.9
Recently, the community design through residents" voluntary participation is spreading all over the nation and contributing to development local cultural environment. The purpose of this study is the proposal of effective evaluation methods and verified achievement characteristics for community design participants based on local environment and methods. A case study carried out Siheung City"s "Hope Community Design" project, which promoted the area"s regeneration through the participation of the local community. Through this research, we gained achievement characteristics based on characteristic of participants and an improvement direction on local community design. Meanwhile, sustainable community design need to sustainable activities and managements of community organization more. We expect that this study can contribute to the improvement of the evaluation methods of community design for developing a pleasant and attractive residential environment.
온도조건에 따른 MR 유체의 물리 특성에 대한 실험 연구
이석현(Lee, Seok-Hyun),손준(Son, June),백대성(Baek, Dae-Sung),권영철(Kwon, Young-Chul) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.3
본 연구에서는 온도조건에 따른 MR 유체의 물리적 특성을 연구하고자 침전 및 전단응력실험을 수행하였다. MR 댐퍼에 사용되는 MR 유체는 자성 파우더를 포함하고 있어 침전현상이 발생하므로 침강성과 인가전류에 의한 전 단응력 변화를 상온과 고온조건에서 실험하였다. 침강특성을 조사하기 위하여 강제 대류형 오븐을 인가전류에 의한 전단응력을 측정하기 위하여 점도계를 사용하였다. 실험결과로부터 MR 유체는 시간과 온도에 따른 침강 특성이 다름 을 그리고 교반시간이 큰 경우에 MR 유체의 분산성이 2배 이상 우수하였다. 전단률이 증가할수록 전단응력은 로그 함수의 증가분포를 인가전류를 증가할수록 2차 함수의 증가분포를 그리고 MR 유체의 전단응력은 상온보다 고온에서 6-18% 낮은 분포를 보였다. In the present study, sedimentation and shear stress of MR fluid are investigated to physical characteristics of MR fluid along temperature conditions. MR fluid is a suspension of micrometer-sized magnetic particles in a base liquid. Therefore, dispersion of MR fluid is important in the case of the design and optimization of the system using MR fluid. Due to sedimentation characteristics of MR fluid by magnetic particles, the sedimentation and shear stress of commercial MR fluid are investigated at 25℃ and 80℃ temperatures by using a forced convection oven and a viscometer. From experimental results, the sedimentation and shear stress are more affected by the temperatures of 80℃ than 25℃ and the mixing time of 5min than 10min. Shear stress by the applied current increases the shape of a quadratic equation and are lower 6-18% at 80℃ than 25℃.