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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.
편측성 후방연장 국소의치에서 직접유지장치의 설계와 지대치 골흡수에 따른 간접유지장치 지대치 주위조직에 발생하는 응력분석
이석현,이청희,조광헌,Lee, Suk-Hyun,Lee, Cheong-Hee,Jo, Kwang-Hun 대한치과보철학회 1998 대한치과보철학회지 Vol.36 No.1
For the purpose of evaluating the effect of both direct retainer design and bony absorption degree around abutment of indirect retainer on the supporting tissue of abutment of indirect retainer, dislodging force was transmitted to unilateral distal extension RPD bases. Analysis of stress distributed within the supporting tissue around abutment of indirect retainer was carried out. Using three-dimensional photoelastic stress analysis method and the conclusion is a follows. 1. According to the extent of force which the direct retainer of the most distal abutment tooth, the amount of force transmitted to the abutment tooth of indirect retainer was small. 2. Of all the cases, Mandibular first premolar which was used abutment tooth of indirect retainer, buccal, mesial and distal sides represented compression stress and lingual side represented tensile stress. 3. The more bone resorption of abutment tooth of indirect retainer, the more distortion of buccal and distal side of abutment tooth was existed and the extent of compression stress which was existed and distal side to abutment tooth was large. 4. When the alveolar bone around the abutment with indircet retainer is normal. The amount of force transmitted on abutment with indirect retainer was small in the order of Akers clasp, RPA clasp, RPI clasp. 5. When the alveolar bone around the abutment with indirect retainer has been absorbed 20% and 30%, the amount of force transmitted on abutment with indirect retainer was small in the order of RPA calsp, RPI clasp, Akers clasp. 6. When denture is displaced, shape of the direct retainer reciprocating abutment affect much the function of indirect retainer.
Wholly Aromatic Polyesters Containing NLO Chromophores in the Side Chain
이석현,임기천,전종택,송석정,Lee, Seok Hyeon,Im, Gi Cheon,Jeon, Jong Taek,Song, Seok Jeong Korean Chemical Society 1996 Bulletin of the Korean Chemical Society Vol.17 No.1
A series of poly(1,4-phenylene terephthalates) with pendant NLO chromophores was prepared by the solution polycondensation of 2,5-NLO chromophore substituted terephthalic acid with hydroquinone. The polymers obtained gave satisfactory NMR and elemental analysis results when taking into account their expected structures and the inherent viscosity value proved the polymeric character of all polymers. DSC, optical polarizing microscopy and WAXS studies revealed that none of these polymers exhibited liquid crystalline mesophases. Preliminary results on NLO properties of these polymers showed a surprisingly large second harmonic signal relative to a Y-cut quartz plate.
발생 부위에 따른 단순성 골낭종의 치료방법에 대한 연구
이석현,서승우,정현일,Lee, S.H.,Suh, S.W.,Jeong, H.I. 대한근골격종양학회 1996 대한골관절종양학회지 Vol.2 No.1
Twenty-nine cases of unicameral bone cyst developed in long bone of children have been treated and followed up for 4.5 years in average form Department of Orthopaedic Surgery, Guro Hospital, Korea University, College of Medicine since September, 1983, Treatment for those lesions differed to form largely two groups, one of which consised of insillation of Methyl-prednisolone for non-weight bearing bones(12 humeri) and the other of curettage and autogenous bone graft for weight-bearing bones(7 femur). Methl-prednisolone group required repetition of instillation for 3.5 time in average spanning over 4 years until cloudy obliteration occurs. Curettage and bone graft had healed in 3 year 6 months' time in average. There were neither recurrence nor pathologic fractures of the lesions with the latter group. Immobilization period was virtually non with Methyl-prednisolone group and 4-6 weeks by hip spica with curettage and bone graft group. As conclusions, It seems confirmed that treatment strategy of unicameral bone cyst consisted of Methyl-prednisolone instillation for humerus lesions and early curettage and bone graft for femur lesions is applicable as guideline having solid ground in clinical experiences.
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
교수에 대한 수학적 지식의 관점에서 본 지필평가문항 분석
이석현,한길준,Lee, Seok-Hyeon,Han, Gil-Jun 한국수학사학회 2012 Journal for history of mathematics Vol.25 No.2
본 연구는 평가 문항에 대한 컨설팅 내용을 '교수에 필요한 수학적 지식 (MKT)'의 영역과 비교하여 '평가 문항 제작에 필요한 지식'의 영역을 알아볼 목적으로 2007년부터 2009년까지 A교육청의 컨설팅단에서 일선학교 교사들이 출제한 문항에 대해 컨설팅을한 내용을 수집하여 분석하였다. 이를 통하여 '평가 문항 제작에 필요한 지식'을 알아보았으며 교사들이 보다 질 높은 평가 문항을 제작할 수 있도록 하기 위해서는 문항 출제 관련 연수 및 컨설팅이 계속해서 이루어질 필요가 있다고 판단된다. This paper aims to identify the area of knowledge required for constructing test items by comparing the consulting contents with the area of MKT(Mathematical Knowledge for Teaching). This paper collects the consulting results by the consulting group of A provincial office of education from 2007 to 2009, and analyzes and categorizes the results. The knowledge for constructing test items are known by the analysis on the consulting contents. Training and consulting for teachers are necessary to enable them to recognize the importance of these categories and improve the quality of test items.
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