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유문현,박혜영,최동규,이가영,Mun Hyun Yoo,M,D,Hye Young Park,M,D,Dong Gyu Choi,M,D,Ka Young Yi,M,D 대한안과학회 2006 대한안과학회지 Vol.47 No.2
Purpose: To report a case of refractive change with intraocular pressure change following trauma. Methods: Changes in intraocular pressure, refractive power, lens thickness, depth of anterior chamber, and axial length of an 8-year-old girl were measured. Results: During the early period after trauma, the patient showed low intraocular pressure and shallow anterior chamber depth. The refractive power changed to transient high myopia. With temporary high intraocular pressure, the refractive power changed to hyperopia and the refractive power recovered toward emmetropia as the intraocular pressure fell to the normal level. Refractive alteration is a result of changes in intraocular pressure and depth of the anterior chamber by cyclodialysis cleft and its adhesion is induced by trauma to the eye. Herein, the authors show evidence for a relationship between refractive change and posttraumatic ocular change.
유문현,조승국 韓國生産性學會 2012 生産性論集 Vol.26 No.4
This study employs an Social Accounting Matrix (SAM) analysis to examine the effects of renewable energy industry on the national economy. The study, therefore, has two major goals. The first is to develop a static SAM framework for examining the effects of renewable energy industry in the short run. The second is to obtain at least a preliminary indication of the effects of the renewable energy industry on Korean economy. The overall results indicate that a significant influence on the industrial production and the household income in Korea.
단순화된 레이아웃 모델을 이용한 새로운 계층적 레이아웃 컴팩터
유문현(Moonhyun Yoo),김원종(Wonjong Kim),이주학(Joohack Lee),이종배(Jongbae Lee),신현철(Hyunchul Shin) 한국정보과학회 1993 정보과학회논문지 Vol.20 No.3
계층적으로 설계된 레이아웃을 계층구조를 유지하면서 효율적으로 컴팩션할 수 있는 새로운 레이아웃 컴팩터가 개발되었다. 이 컴팩터는 같은 종류의 셀이 반복해서 나타나는 규칙적으로 설계된 레이아웃을 간략화된 레이아웃으로 모델링하고, 1차원 및 2차원 리프셀 알고리듬을 이용하여 컴팩션한다. 제한그래프 방식을 이용하였으며, 그래프는 event-driven 최장 경로 알고리듬을 이용하여 풀이하였다. 계층구조의 유지를 위해서 간략화된 모델에 대해서 추가적인 에지를 사용하였고, 자동으로 배선 구부리기 및 배선 길이 최소화를 수행하도록 하였다. 벤취마크 예제에 대한 실험결과에서 본 컴팩터는 현재까지 발표된 중에서 가장 좋은 결과를 보여주었다. A new hierarchy-preserving hierarchical compactor for regularly structured layouts has been developed. It can be used with either 1D or 2D leafeell compaction techniques and jogs can be introduced automatically. The compactor is applicable for hierarchical layouts which consist of a number of subarrays of identical cells. Firstly, a simplified model of the hierarchical layout is built in which instances of an identifical cell in a subarry is represented by a cell. Secondly, constraint graph is built for the simplified model. Appropriate constraints are added to preserve the hierarchy so that all the instances of a subarray of an identical cell have the same shape after compaction. Finally, the event-driven longest-path solving finds an optimal solution that satisfies all the constraints. This method is efficient and simple enough to accommodate 2D compaction techniques and automatic jog generation. Experimental results on bencmark examples show that the proposed method can produce the best results in area when compared with other published results.
재발된 외사시에서 한 눈 외직근 후전 및 내직근 절제술과 두 눈 내직근 절제술의 비교
박혜영,유문현,최동규,Hye Young Park,M,D,Mun Hyun Yoo,M,D,Dong Gyu Choi,M,D 대한안과학회 2006 대한안과학회지 Vol.47 No.1
Purpose: The purpose of this study was to compare the surgical results between unilateral lateral rectus recession-medial rectus resection (R&R) and bilateral medial rectus resections in recurrent exotropia. Methods: In this retrospective study, 22 patients with recurrent exotropia of the basic or pseudodivergence excess types were enrolled. In group A (14 patients), unilateral R&R was performed during the first operation, and R&R was performed in contralateral eyes during the second operation. In group B (8 patients), bilateral lateral rectus recessions were performed during the first operation and bilateral medial rectus resections during the second operation. Results: The mean time interval between the first and second operations was 28.9 months (range, 5 to 64 months) in Group A and 59.9 months (range, 35 to 75 months) in Group B, which was a significant difference between the two groups (p=0.006). The success rates at last follow-up after the second operation were 85.7% in Group A and 87.5% in Group B, which was not statistically different between the two groups (p<1.000). Conclusions: There was no difference in success rate after the second operation between the two groups. Therefore, the operation method for recurrent exotropia can be chosen according to the operator`s preference.