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- 저자 : 심현석(Hyun Seog Sim) (검색결과 7 건)
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이성욱,심현석,장성주,Lee, Seong-Wook,Sim, Hyun-Seog,Jang, Seong-Joo 한국안광학회 2001 한국안광학회지 Vol.6 No.2
건안은 콘택트렌즈를 착용하는 대부분의 환자에게서 쉽게 나타날 수 있으며 방치해 두면 누액의 안정성이 줄어들고 누액의 찌꺼기, 점액이 점점 증가하면서 각막 얼룩이 형성되어 눈에 충혈, 건조감 등을 동반할 수 있다. 본 연구에서는 51명의 성인 남녀를 대상으로 건성안을 판단하기 위해 Schirmer test, TBUT, 순목 횟수 등을 조사하였다. 건성안 검사 방법 중 순목 횟수는 1분에 평균 19회였고 Schirmer test의 평균은 5분에 25mm이였으며, TBUT는 평균 7.1초로 나타났다. 이런 결과로 TBUT 검사치가 낮으면 순목 횟수가 증가하는 것으로 나타났다. The purpose of our study was stability of tear film for Korean. In the 1970s, the major problem for the contact lens practitioner was the management of contact lens parameters. In the 1980s, oxygen permeability was the main problem in contact lens practice: now it is dry eyes. To appropriately fit the patient with contact lenses it is imperative to know in advance if the patient has a marginal dry eye. Based on the initial diagnosis appropriate care can be taken to minimize problems with the result that the patient can successfully wear contact lenses. A well known test for dry eyes is Schirmer test which has shown to be useful for diagnosing Sjogren syndrome. Biomicroscopy can often unmask numerous problems. The classical test for marginal dry eye is measuring the tear break up time(TBUT). A dry eye problem with contact lenses is often caused by the lid. If an incomplete blink is responsible for the dry eye it is possible to change the situation by blinking exercises. The result of these test, mean value of age was 22.8, mean value of blink rate was 19 times/min, mean value of Schirmer test was 25 mm/5 min, mean value of TBUT was 7.1 sec.
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In-mold Decoration(IMD) 포일용 경질 코팅 수지 설계 및 전자빔 조사가 IMD 포일 구성층에 미치는 영향
이광희(Kwang Hee Lee),심현석(Hyun Seog Sim),김건석(Geon Seok Kim),신지희(Ji Hee Shin) 한국고분자학회 2012 폴리머 Vol.36 No.3
실란 커플링제를 사용하여 알루미나 나노 입자의 표면을 처리하였다. 표면을 개질한 나노 입자를 in-mold decoration(IMD) 포일의 경질 코팅 층에 도입하여 표면 경도 및 내마모성을 중심으로 도막의 물성 변화를 평가 하였다. 전자빔(electron beam, EB) 조사가 IMD 포일을 구성하는 color layer 및 anchor layer에 미치는 영향을 색 도변화와 cross-cut tape 시험을 통하여 평가하였다. 또한 EB 조사 온도에 따른 경화 거동을 표면 물성 변화 평가 및 Fourier transform infrared(FTIR) spectroscopy 관찰을 통해 정량적으로 분석함으로써 EB 경화 공정의 실용 화에 필요한 데이터베이스를 구축하였다. The silane coupling agent, 3-(trimethoxysilyl)propyl methacrylate (γ-MPTS), was grafted on the surface of alumina nanoparticles. We used the surface modified nanoparticles in the hard coating layer for in-mold decoration (IMD) foils and evaluated the coating properties such as hardness and anti-abrasion property. The effects of electron beam (EB) irradiation on color layer and anchor layer of IMD foils were observed through the difference in color and the cross-cut tape test, respectively. Also, cure kinetics as studied quantitatively under various reaction temperatures by analysis of surface properties and Fourier transform infrared (FTIR) spectroscopy. From these results, we constructed database for the commercial exploitation of EB curing system.
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교합형 동방향 이축압출기에서 충전제 분산에 대한 스크루 조합의 영향
강민성(Min Sung Kang),강병욱(Byoung Yook Kang),심현석(Hyun Seog Sim),손재명(Jae Myoung Son),이광희(Kwang Hee Lee),박민(Min Park) 한국고분자학회 2011 폴리머 Vol.35 No.2
컴파운드의 물성을 최적화하기 위해서는 충전제 입자들의 분배와 분산이 잘 일어나도록 효율적으로 혼련하는 것이 중요하다. 혼련 효율을 향상시키고자 다양한 종류의 혼련 요소들이 이축압출기에 이용되고 있다. 본 연구에서는 탄산칼슘이 충전된 폴리스티렌을 대상으로 충전제 분산에 대한 이축압출기의 스크루 조합 영향을 알아보았다. 충전제의 분산 상태는 포토다이오드가 장착된 광학현미경으로 조사하였다. 실험 결과는 충전제의 분산 정도가 혼련 요소들의 형태 및 위치에 주로 영향을 받는다는 것을 보여주었다. To optimize the properties of compounds, effective mixing is of importance to achieve adequate distribution and dispersion of filler particles. A variety of mixing elements have been used for twin-screw extruders in order to improve the mixing efficiency. In this study, the effects of 10 screw configurations on the filler dispersion were investigated for the calcium carbonate filled polystyrene processed in a co-rotating twin-screw extruder. The state of filler dispersion was characterized by optical microscopy equipped with a photodiode. The experimental results indicated that the type and position of mixing elements primarily affected the degree of filler dispersion.
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임용무(Yong Moo Lim),심문식(Moon Sik Shim),심현석(Hyun Seog Sim),김상문(Sang Moon Kim) 한국안광학회 2001 한국안광학회지 Vol.6 No.1
In this study, we compared the properties of 23 high and 55 low price sunglass lenses with the standards in the ordinary optical properties. materials, coloration, UV. IR and luminous transmittance, color acceptance for traffic signal, chromaticity and contrast sensitivity. The ordinary optical properties of the lenses met comparatively the requirements of the KS standard. The HIGH-type and LOW-type lenses were primarily made by glass and acrylate, respectively. In the coloration, HIGH-type was in group around neutral color but LOW-type was distributed widely on the line between 570 nm and 485 nm. There are fails in 7 of HIGH-type and 18% of LOW-type in the stimulus purity of the luminous transmittance. Wavelength of the UV/VIS cut-off was over 350 nm for HIGH-type but 6 of LOW-type was under 350 nm. In the erythemal UV, all HIGH-type met the needs of standards but 5 LOW-type failed with DIN standard. In the near UV, KS standard worked in stringency, and HIGH-type showed more failure than LOW-type. The characteristics of the IR transmittance of HIGH-type was better than that of LOW-type. In the color acceptance of traffic signal, all HIGH-type met the needs of ANSI standards but 21.8 of LOW-type failed with the standard. In the contrast sensitivity tested with various coloured sunglasses, the value increased with increasing of L and decreasing of test distance. In view of the results so far, HIGH-type met with excellent properties as compared with LOW-type.
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In-mold Decoration 포일에 사용되는 경질 코팅 수지의 전자빔 경화
이광희(Kwang Hee Lee),이병철(Byung Cheol Lee),심현석(Hyun Seog Sim),윤덕우(Deok Woo Yun),김건석(Geon Seok Kim) 한국고분자학회 2011 폴리머 Vol.35 No.2
In-mold decoration 포일의 경질 코팅 층에 사용하는 수지를 대상으로 전자빔(electron beam, EB) 경화에 관한 연구를 수행하였다. 시료에 다른 양의 EB를 조사하고, 경화 반응 정도를 Fourier transform infrared(FTIR) spectroscopy를 사용하여 관찰하였다. EB 조사선량 증가에 따른 코팅 물성의 변화를 표면 경도와 내마모성을 중심으로 알아보았다. 또한 나노 입자 첨가가 코팅 물성에 미치는 영향을 조사하였다. 본 연구로부터 얻은 실험적 결과는 자외선 (ultraviolet, UV) 경화 시스템과 유사한 EB 경화 시스템의 상업적 개발에 이용될 수 있을 것으로 기대된다. The electron beam (EB) induced curing of a typical resin designed for the hard coating layer of in-mold decoration foils was investigated. The samples were irradiated with different doses of EB and the curing reaction was monitored by Fourier transform infrared (FTIR) spectroscopy. The change in coating properties such as surface hardness and anti-abrasion property was studied as a function of increasing dose. The effect of the addition of nano-particles on the improvement of coating properties was also examined. It was expected that the experimental results could be used for the commercial exploitation of the EB curing system comparable to the ultraviolet (UV) curing system.
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