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정윤석(Yun-Suk Chung) 한국철학회 2006 철학 Vol.88 No.-
한 때 사상적으로 인간적으로 같은 길을 걸었던 하이데거와 아렌트는, 한 명은 나치당에 입당하여 대학 총장이 되고, 다른 한 명은 나치의 박해를 피해 망명의 길을 떠나는 엇갈린 길을 가게 된다. 외견상 이러한 차이의 원인은 인종주의를 신봉하던 나치 시대에 한 명은 순수 독일인이고 다른 한 명은 유대인이었다는 사실에서 기인하는 것처럼 보이지만, 좀 더 내면을 들여다보면 '세계' 개념에 대한 철학적, 정치적 해석의 차이가 그 근본에 놓여 있다. 두 사람은 모두 근대와 더불어 세계에서 안정된 거처를 상실한 인간들을 위해 참된 세계를 회복하려고 노력하지만, 하이데거가 존재의 세계, 본질의 세계, 본래적인 세계에서 안식을 찾는 반면, 아렌트는 일상의 세계, 현상의 세계, 비본래적인 세계에서 인간의 참된 거주 공간을 발견하게 된다. 아렌트는 하이데거가 『존재와 시간』에서 인간을 '세계-내-존재'로 규정한 것을 실마리로 삼되 그 형이상학적이고 존재론적인 성격을 버리고 정치 적이고 현상적인 방향으로 변형하여 공론 영역을 살려낼 철학적 기초를 마련한다.
정윤석(Yun-Suk Chung),박진수(Jinsoo Park),김종석(Chong-Suk Kim) 한국마린엔지니어링학회 2002 한국마린엔지니어링학회 학술대회 논문집 Vol.2002 No.-
Strength analysis and evaluation of a medium size diesel engine connecting rod have been carried out. Main purpose of this paper is to introduce the strength analysis procedure applicable in the initial design stage of diesel engine connecting rods. Static strength, split and sliding of the contact surfaces, deformation of the big end, buckling and fatigue strength are dealt with. The analysis results show that the connecting rod has sufficient strength.
거짓비늘증후군에서 발생하는 다양한 종류의 녹내장: 저안압녹내장
서지영,박인원,정윤석,Ji Young Seo,MD,In Won Park,MD,Yun Suk Chung,MD 대한안과학회 2011 대한안과학회지 Vol.52 No.12
Purpose: To evaluate the types of glaucoma in patients with pseudoexfoliation syndrome (PXS) and analyze the glaucomatous changes in patients with normal intraocular pressure (IOP). Methods: A retrospective chart analysis of patients diagnosed with PXS was performed. The types of glaucoma were classified based on the IOP, optic disc examination, visual field test results, and optical coherence tomography (OCT) results. Other than those with pseudoexfoliative glaucoma (PXG), the normal IOP patients with PXS were divided into glaucomatous and non-glaucomatous groups. Later, the glaucomatous group was clinically compared to the non-glaucomatous group. Results: The records of 40 patients with PXS were evaluated. Among the 48 PXS eyes, high pressure glaucoma was found in 21 eyes (43.75%), low pressure glaucoma in 5 eyes (10.42%), and non-glaucoma in 19 eyes (39.58%). However, in the 32 fellow eyes without PXS, 2 eyes (6.25%), 8 eyes (25%), and 20 eyes (62.5%) showed the above diseases, respectively. In result, PXS affected the glaucomatous change (odds ratio = 2.544, p = 0.045). By contrast, in PXS patients with normal IOP, PXS did not affect the glaucomatous change (p = 0.519). Conclusions: Diverse types of glaucoma including low pressure glaucoma may exist in patients with PXS. Considering the possibility of low pressure glaucoma in patients with PXS is necessary. J Korean Ophthalmol Soc 2011;52(12):1455-1460
증식당뇨망막병증 환자에서 유리체절제술 후 신생혈관녹내장 발생의 위험인자 분석
정희영,정혜진,최진영,손준홍,정윤석,Hee Young Chung,Hye Jin Chung,Jin Young Choi,Joon Hong Sohn,Yun Suk Chung 대한안과학회 2013 대한안과학회지 Vol.54 No.12
Purpose: The use of pre- and intraoperative vitreous bevacizumab injection and combined lens extraction with vitrectomy in patients with proliferative diabetic retinopathy (PDR) is increasing. In this study we analyzed the incidence and risk factors of neovascular glaucoma (NVG) after vitrectomy for PDR.<br /> Methods: Patients who underwent vitrectomy for PDR from January 2004 to June 2011 were retrospectively reviewed. The minimum follow-up was 12 months. The cumulative incidence of NVG was calculated using the Kaplan-Meier survival analysis. The patients were divided into 4 groups according to lens status (preoperative pseudophakic group, simultaneous cataract surgery group, sequential cataract surgery group, non-cataract surgery group). The differences in incidence between the groups were determined by the Chi-square test. Finally, to analyze the risk factors associated with the occurrence of NVG, the Cox's regression model was used.<br /> Results: Of the 614 eyes (402 patients), 284 were males and 330 were females. The mean age was 55.8 ± 10.46 years (range 30-81 years) and the mean follow-up period was 36.6 months (range 1-93 months). Thirty-four of 614 patients (5.5%) developed postoperative NVG after vitrectomy. The probability of NVG occurrence at 6 and 12 months after vitrectomy was 0.7% and 2.5%, respectively. The incidence between the 4 groups did not show a statistically significant difference. The risk factors for postoperative NVG were male gender (RR = 3.01 p = 0.004), preoperative intravitreal bevacizumab injection (RR = 7.20, p < 0.001), and reoperation (RR = 3.18, p = 0.0037).<br /> Conclusions: The frequency of NVG after vitrectomy in patients with PDR was 5.5%. Lens status was not associated with NVG occurrence. The risk factors related to NVG were male gender, preoperative intravitreal bevacizumab injection, and reoperation.<br /> J Korean Ophthalmol Soc 2013;54(12):1868-1874
광학부 중앙 원공을 가지는 안내렌즈삽입술 후 발생한 색소분산증후군 및 역 동공 차단
이수찬(Su Chan Lee),정혜진(Hye Jin Chung),정윤석(Yun Suk Chung),최진영(Jin Young Choi),최기용(Kee Yong Choi),김미정(Mi Jeung Kim) 대한안과학회 2016 대한안과학회지 Vol.57 No.10
목적: 광학부 중앙 원공이 있는 안내렌즈(AQUA ICLⓇ) 삽입술을 시행 받은 환자에서 발생한 색소분산증후군과 역 동공 차단이 안내렌즈 제거 및 주변부 레이저 홍채절개술 후 호전된 증례를 보고하고자 한다. 증례요약: 양안 근시 소견을 보이는 29세 여자 환자에게 양안 AQUA ICLⓇ 삽입술을 시행하였다. 삽입술 후 4주에 양안 모두 색소분산이 발생하면서 안압이 각각 34 mmHg로 증가하였으며 최대 약물치료에도 불구하고 안압이 조절되지 않아 삽입술 후 8주에 안내렌즈를 제거하였다. 안내렌즈 제거 직후 색소 분산이 감소하면서 안압이 조절되는 양상을 보였으나 제거 수술 4주에, 우안 홍채의 후방이동 및 역 동공 차단이 발생하며 우안 안압이 46 mmHg로 다시 증가하였다. 우안에 주변부 레이저 홍채절개술을 시행한 후 역 동공 차단이 해소되면서 색소 분산이 감소되었고 우안 안압이 13 mmHg로 정상화되었다. 2주 후 좌안에 예방적 레이저 홍채절개술을 시행하였다. 좌안 레이저 홍채절개술 시행 4주 후, 양안에 선택적 레이저 섬유주성형술을 시행하였으며 4주 후 측정 안압은 점안 안압하강제를 투약하는 상태에서 우안 11 mmHg, 좌안 12 mmHg로 측정되었다. 결론: 광학부 중앙 원공을 가지는 안내렌즈 삽입술 후 조기에 색소분산증후군이 발생할 수 있으며, 색소분산증후군이 안내렌즈 제거 후에도 지속되면서 역 동공 차단이 동반될 경우 주변부 레이저 홍채절개술이 부분적으로 효과가 있음을 알 수 있었다. <대한안과학회지 2016;57(10):1661-1665> Purpose: To report a case of pigment dispersion syndrome and reverse pupillary block secondary to the implantation of implantable collamer lens (ICL) with a central hole (AQUA ICL??) that was treated with ICL removal and laser peripheral iridotomy (LPI). Case summary: A 29-year-old woman with myopia in both eyes underwent implantation of AQUA ICL??. Four weeks postoperatively, the intraocular pressure (IOP) increased to 34 mm Hg and the patient showed pigment dispersion syndrome in both eyes. Since the IOP did not reduce with the maximum tolerable medical therapy, the ICLs were removed 8 weeks after implantation. The pigment dispersion subsided and IOP reduced shortly after ICL removal. However, 4 weeks after removal of ICL, posterior iris bowing and reverse pupillary block occurred in the right eye and the IOP increased to 46 mm Hg. LPI was performed in the right eye, and the reverse pupillary block was dissolved after a reduction in pigment dispersion. The IOP subsequently normalized to 13 mm Hg. Two weeks later, prophylactic LPI was performed in the left eye. Four weeks after prophylactic LPI, selective laser trabeculoplasty was performed on both eyes. As a result, the IOP was 11 mm Hg in the right eye and 12 mm Hg in the left eye after 4 weeks of treatment with topical IOP-lowering medications. Conclusions: The present case indicates that implantation of ICL with a central hole can lead to early postoperative pigment dispersion syndrome. When this condition persists and is accompanied by reverse pupillary block after ICL removal, LPI can be partially effective. J Korean Ophthalmol Soc 2016;57(10):1661-1665