안과 전공의 수련과정 중 백내장 수술에 대한 설문조사

엄영섭,강수연,김효명,송종석,Youngsub Eom,MD,Su Yeon Kang,MD,Hyo Myung Kim,MD,PhD,Jong-Suk Song,MD,PhD 대한안과학회 2011 대한안과학회지 Vol.52 No.4

Purpose: To investigate cataract surgical experiences during ophthalmology residency in Korea. Methods: A survey regarding cataract surgical experiences during residency was sent to 4th year ophthalmologic residents (112) from April to September 2010. Results: Of the 112 individuals to whom the surveys were sent, 35 (31.3%) responded. The majority of the respondents (65.7%) performed their first cataract operation as the primary surgeon in their 4th year of residency. The majority of the respondents (42.9%) also thought that continuous curvilinear capsulorhexis (CCC) was the most difficult procedure followed by nucleus removal (31.4%). Fourteen respondents (40.0%) experienced loss of lens fragments into the vitreous cavity. Nine (25.7%) respondents had experienced performing ECCE (Extracapsular cataract extraction) during residency training. Also, 48.6% performed 1 to 5 cataract procedures during their entire residency training while 20.0% performed 6 to 10. Conclusions: The experiences in cataract surgery during residency were investigated for the first time through a questionnaire survey. The Korean ophthalmology residency program needs to provide more opportunities for residents to perform cataract surgery during their training period. J Korean Ophthalmol Soc 2011;52(4):429-433

한국인 대상 자동굴절검사와 현성굴절검사로 계산된 최적화 인공수정체 상수 비교

엄영섭,임동희,김동현,변용수,나경선,김성재,노창래,정소향,이지은,조경진,정태영,김은철,신영주,이상목,조양경,윤경철,유인천,고병이,김홍균,송종석,이도형 대한안과학회 2022 대한안과학회지 Vol.63 No.9

목적: 한국인을 대상으로 백내장수술 후 자동굴절검사와 현성굴절검사로부터 최적화된 인공수정체 상수를 도출하고, 굴절검사 방법에따라 최적화된 인공수정체 상수에 차이가 있는지 확인하고자 하였다. 대상과 방법: 후향적 다기관 코호트 연구를 통하여 수정체유화술 및 인공수정체 낭내삽입술을 시행받은 환자 4,103명 4,103안이 18개기관에서 등록되었다. 동일한 생체계측장비와 인공수정체를 사용한 표본에서 자동굴절검사 또는 현성굴절검사로부터 SRK/T, Holladay, Hoffer Q, Haigis 공식의 최적화된 인공수정체 상수를 계산하였다. 자동굴절검사값과 현성굴절검사값으로 최적화된 인공수정체 상수를 비교하였다. 결과: 4,103안 중 IOLMaster 500으로 생체계측을 시행한 경우(62.9%)가 가장 많았으며, 다음은 IOLMaster 700 (15.2%)이었다. 총33가지의 인공수정체가 사용되었으며, Tecnis ZCB00 (53.0%)가 가장 많았다. 대상자 수가 많은 경우 자동굴절검사와 현성굴절검사로부터 최적화된 인공수정체 상수에 유의한 차이가 없었지만, 대상자 수가 적은 경우 자동굴절검사값으로부터 최적화된 인공수정체상수는 현성굴절검사값으로부터 최적화된 인공수정체 상수보다 유의하게 작았다. 결론: 한국인을 대상으로 최적화된 인공수정체 상수가 도출되어 인공수정체 도수 계산에 사용할 수 있게 되었다. 하지만 작은 표본집단에서 자동굴절검사값으로 인공수정체 상수를 최적화하는 경우, 인공수정체 상수가 작게 계산되어 수술 후 굴절 오차가 발생할 수 있다.

蛔蟲 및 鉤蟲의 感染이 宿主의 血淸蛋白分劃像에 미치는 影響에 關한 實驗的 硏究

儼英燮 연세대학교 의과대학 1968 연세의대논문집 Vol.1 No.1

A new topology optimization scheme for nonlinear structures

엄영섭,한석영 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.7

A new topology optimization algorithm based on artificial bee colony algorithm (ABCA) was developed and applied to geometricallynonlinear structures. A finite element method and the Newton-Raphson technique were adopted for the nonlinear topology optimization. The distribution of material is expressed by the density of each element and a filter scheme was implemented to prevent a checkerboardpattern in the optimized layouts. In the application of ABCA for long structures or structures with small volume constraints, optimizedtopologies may be obtained differently for the same problem at each trial. The calculation speed is also very slow since topology optimizationbased on the roulette-wheel method requires many finite element analyses. To improve the calculation speed and stability ofABCA, a rank-based method was used. By optimizing several examples, it was verified that the developed topology scheme based onABCA is very effective and applicable in geometrically nonlinear topology optimization problems.

고등학교 화학실험의 탐구적지도 및 평가방안의 연구

엄영섭,이화국 全北大學校 科學敎育硏究所 1985 과학과 과학교육 논문지 Vol.10 No.-

School science laboratory has been considered as the most effective and essential in practicing students' scientific inquiry skills. But due to lack of laboratory facilities, inappropriate entrance examination, teacher's heavy teaching load and, most of all, teachers' inability to prepare and teach science laboratry as an integrated part of scientific inquiry the ideals of laboratory inquiry have been frustrated. In this study, some simple but useful guidelines to easy teachers in preparing teaching materials and test items for inquiry science laboratory were developed by systems approaches. A model of inquiry processes in school science laboratry called "Framework of Laboratory Inquiry" constructed through investigations of the nature of scientific inquiry and contemporary models of inquiry processes was used as the theoretical foundation of those guidelines. The Framework of Laboratory Inquiry is composed four stages of laboratory inquiry and eleven inquiry skills. The gudelines, development of which provided useful feedbacks in constructing the Framework of Laboratory Inquiry, were applied to prepare inquiry laboratory activities in high school chemistry and were modified to accommodate feedbacks arose from the applications. Follwed by the descriptions of the Framework of Laboratory Inquiry, the guidelines, and the developed teaching materials, several suggestions to improve school science laboratory were made as the conclusions.

근사기법을 이용한 신뢰성 해석

엄영섭,유광선,박재용,한석영 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

It is important to represent limit state function in reliability-based design optimization. Since it is very difficult to explicitly represent a limit state function in topology optimization, it is necessary to make the limit state function an approximate function. In case of implementing RSM, the limit state function can easily approximated. In this study, the limit state function of structures was approximated using ADAPRES to obtain the effective response surface modeling as reducing the experiment points. From the result of carrying out the BESO using the ADAPRES, it is concluded that the ADAPRES can be applied to RETO and is more effective than RSM in computing cost.

Distribution and Characteristics of Meibomian Gland Dysfunction Subtypes: A Multicenter Study in South Korea

엄영섭,송종석,나경선,조경진,황호식,김선웅,정태영,전루민,김현승 대한안과학회 2019 Korean Journal of Ophthalmology Vol.33 No.3

Purpose: We sought to evaluate the distribution and characteristics of meibomian gland dysfunction (MGD)and the treatment patterns for symptomatic MGD patients in South Korea. Methods: One hundred ninety-six right eyes of 196 MGD patients were enrolled. For each patient, meibumexpressibility in the central eight glands in both the upper and lower eyelids was examined. Each upperand lower eyelid was separately classified into one of the following three subtypes: nonobvious obstructive(low-delivery without lid margin abnormality), obvious obstructive (low-delivery with lid margin abnormality),and hypersecretory (high-delivery with lid margin abnormality). All treatment plans were also recorded. Results: The mean number of expressible glands of the central eight glands in the upper eyelids (3.9 ± 2.6)was significantly higher than that in the lower eyelids (2.2 ± 2.4, p < 0.001). Obvious obstructive MGD wasthe most common subtype, followed by the hypersecretory and nonobvious obstructive subtypes in boththe upper and lower eyelids. Of the 196 subjects, 38 (19.4%) had upper and lower eyelids that were assignedto different categories. Eyelid hygiene was the most prescribed treatment (74.5%), followed by lubricant eyedrop usage (71.5%). Physicians tended to determine treatment plans based on the subtype of the upper eyelidrather than that of the lower eyelid. Conclusions: The majority of subjects were classified as having the obvious obstructive subtype of MGD, and19.4% had upper and lower eyelids that were different subtypes. Eyelid hygiene was the most prescribedtreatment for MGD patients, and treatment patterns were mostly determined based on the subtype of theupper eyelids.

Computation of geographic variables for air pollution prediction models in South Korea

엄영섭,김선영,김환철,임종한,Sun Young Kim 환경독성보건학회 2015 환경독성보건학회지 Vol.30 No.-

Recent cohort studies have relied on exposure prediction models to estimate individuallevel air pollution concentrations because individual air pollution measurements are not available for cohort locations. For such prediction models, geographic variables related to pollution sources are important inputs. We demonstrated the computation process of geographic variables mostly recorded in 2010 at regulatory air pollution monitoring sites in South Korea. On the basis of previous studies, we finalized a list of 313 geographic variables related to air pollution sources in eight categories including traffic, demographic characteristics, land use, transportation facilities, physical geography, emissions, vegetation, and altitude. We then obtained data from different sources such as the Statistics Geographic Information Service and Korean Transport Database. After integrating all available data to a single database by matching coordinate systems and converting non-spatial data to spatial data, we computed geographic variables at 294 regulatory monitoring sites in South Korea. The data integration and variable computation were performed by using ArcGIS version 10.2 (ESRI Inc., Redlands, CA, USA). For traffic, we computed the distances to the nearest roads and the sums of road lengths within different sizes of circular buffers. In addition, we calculated the numbers of residents, households, housing buildings, companies, and employees within the buffers. The percentages of areas for different types of land use compared to total areas were calculated within the buffers. For transportation facilities and physical geography, we computed the distances to the closest public transportation depots and the boundary lines. The vegetation index and altitude were estimated at a given location by using satellite data. The summary statistics of geographic variables in Seoul across monitoring sites showed different patterns between urban background and urban roadside sites. This study provided practical knowledge on the computation process of geographic variables in South Korea, which will improve air pollution prediction models and contribute to subsequent health analyses.

Self-inflicted Chronic Bacterial Keratoconjunctivitis Using Self Semen

엄영섭,김영호,김성현,김효명,송종석 대한안과학회 2013 Korean Journal of Ophthalmology Vol.27 No.6

This case report describes a case of self-inflicted chronic bacterial keratoconjunctivitis involving thepatient’s own semen. A 20-year-old male soldier was referred to our clinic for the evaluation of refractorychronic bacterial conjunctivitis. Over the previous 4 months, he had been treated for copious mucousdischarge, conjunctival injection, and superficial punctate keratitis in both eyes at an army hospital and alocal eye clinic. Despite the use of topical and systemic antibiotics according to the results of conjunctivalswab culture, there was no improvement. During the repeated smear and culture of conjunctivalswabs, surprisingly, a few sperm were detected on Gram staining, revealing that the condition wasself-inflicted bacterial keratoconjunctivitis involving the patient’s own semen. Thus, in cases of chronickeratoconjunctivitis that do not respond to appropriate antibiotic treatment, self-inflicted disease ormalingering should be considered.

비선형 정적 문제에 대한 벌군집 알고리즘의 적용

엄영섭(Young-Sop Eom),유광선(Kwang-Sun Yoo),김동연(Dong-Yeon Kim),박재용(Jae-Yong Park),한석영(Seog-Young Han) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-

In this paper, bee colony algorithm and finite element analysis are adopted for topology optimization of structural models undergoing large deformations. The objective is to obtain the stiffest structure with a certain amount of material, based on each element's contribution to the strain energy. Newton-Raphson method is used to calculate nonlinear problem. In order to prevent checkerboard pattern in the resulted optimum layout, the latest developed filter scheme is implemented. Cantilever beam was elected as numerical example. After solving example, it is found that the effectiveness and applicability of the proposed algorithm. The bee colony algorithm is well able to handle nonlinear topology optimization problems.