• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.269-270
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• 2011

본 논문에서는 점차 증대되는 신재생 에너지 비율에 따라 계통 연계형 태양광 발전 시스템에 엄격하게 요구되고 있는 규정들에 대해 독일 연방 에너지 수자원 관리 협회(BDEW: Bundesverbands der Energie und Wasserwirtschaft)의 규정을 근간으로 그에 따른 인증 시험 항목에 대해 기술하기로 한다. 또한 실제 (주)카코 뉴 에너지의 BDEW 인증 시험 자료의 일부분을 바탕으로 시험의 중요성 및 필요성에 대해 그 타당성을 입증한다.

• Proceedings of the Optical Society of Korea Conference
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• 2009.10a
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• pp.175-176
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• 2009

• The Optical Journal
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• s.102
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• pp.22-27
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• 2006

코팅에는 매우 많은 종류가 있다. 또한 박막(Thin Film)의 경우, 기상법, 액상법, 졸겔법 또는 도금법 등의 퇴적 방식으로 제작되는 것과 산화, 확산 또는 이온 주입 등의 기판 침입법으로 형성되는 것 등 매우 다양하다. 레이저용 코팅은 그 중 극히 일부에 지나지 않으며, 시장적으로도 틈새 분야이다. 그러나 레이저가 세상에 출현한 이래 40년의 시간이 지나는 동안 레이저 가공, 레이저 의료, 리소그래피 인쇄, 광 통신, 레이저 계측 등 광범위하게 레이저가 사용되었으며, 레이저용 코팅에 대한 수요가 증가되고 있는 것이 현실이다. 레이저용 코팅은 카메라나 안경으로 대표되는 광학 박막과 동일한 성격이지만, 레이저라는 일반적으로 에너지가 강한 광선에 사용되기 때문에, 레이저 손상을 고려하여 제작해야 한다.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.07a
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• pp.48-48
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• 2004

• Proceedings of the Optical Society of Korea Conference
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• 2000.08a
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• pp.72-73
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• 2000

단원자를 이용한 Cavity-QED 실험을 통해서 광자 수상태 및 sub-poissonian 광원 구현 및 비고 전적인 광 특성을 가지는 광원등을 구현 할 수 있다. 이를 위해서는 오랫동안 공진기 안에 포획하거나, 빔의 형태로 단원자들이 일정시간 동안 공진기를 지나게 해야 한다. 본 연구는 안정한 원자빔 속도제어 실험에 관한 것으로 자체 제작한 원자빔 오븐의 특성과 원자빔 속도 선택기의 제작, 속도 선택 결과에 대하여 논하고자 한다. (중략)

• Proceedings of the KIPE Conference
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• 2013.11a
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• pp.113-114
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• 2013

일본은 동일본 대지진 이후로 원자력 발전 가동을 점차 중단시켜 가고 있는 추세이고 이에 발 맞추어 신재생에너지 발전 비중은 높아지고 있다. 특히 태양광 발전에 대한 관심은 주택용 뿐 아니라 발전소 수준의 메가솔라 시장으로 확대 되어 가고 있다. 본 논문에서는 일본형 대용량 계통연계형 태양광 인버터들이 가져야 할 기능 중 FRT 기능에 관해 일본 계통연계 규정인 JEAC 9701-2010을 기반으로 알아보고자 한다.

• Journal of Korean Ophthalmic Optics Society
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• v.12 no.2
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• pp.37-45
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• 2007

We have measured the spectral transmittances of UV blocking soft contact lenses, regular soft contact lenses and regular RGP lenses using the method suggested in ANSI Z80.20 standard. In order to evaluate visible light transmitting and UV blocking characteristics, we have calculated transmittances by integrating over the specific spectral ranges, i.e., visible light, UVA, UVB and UVC. We found that mean transmittances of visible light for all three categories were over 90.0 % which could be considered as within acceptable range for a contact lens. The transmittance of the UVA and UVB radiation for the UV blocking soft lenses except some cases was within UVR (Ultraviolet radiation) transmittance standard. The UV blocking ability of regular soft and RGP lenses was poor as rather expected. These results will be expected to assist clinical opticians and practitioners in utilizing the transmittance characteristics about the contact lens.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.7
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• pp.1635-1641
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• 2009

In this study, we have prepared plastic lenses with both photochromic and hard properties by hard coating, and evaluated their optical properties and surface characteristics. Photochromic effects could be observed on the UV spectra of the closed forms and the visible spectra of the open forms. Visible light transmittance of photochromic lenses was from 83.44% for graphite(GP) to 85.15% for blue(BL) in colourless state and from 71.10% for red(RE) to 79.98% for yellow(YE) in colour state. Red photochromic lens was higher in optical density(${\Delta}$OD) and color difference(${\Delta}$$E^{\ast}_\;{ab}$) than the others. Photochromic lenses applied by hard coating showed good adhesion, hot water resistance, chemical resistance and surface appearance. Also, compared to the uncoated lens, hardness and abrasion resistance were increased. Consequently, this coating system could impart functional properties such as photochromic and hard coating property onto ophthalmic lenses.

• The Korean Journal of Vision Science
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• v.20 no.4
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• pp.561-568
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• 2018

Purpose : The size and regular array of the collagen fibers in the corneal stroma have very close correlation with transparency. Simulation was carried out to investigate the change of light transmittance according to the array structure and collagen fiber layer thickness. Methods : The collagen fibers in corneal stroma were arranged in regular hexagonal, hexagonal, square and random shapes with OptiFDTD simulation software, and the light transmittance was analyzed. In square array, the light transmittance according to the density change was confirmed by when the number of collagen fibers in the simulation space was the same and the light transmittance was examined when the number and density of collagen fibers were changed. Results : When the number of collagen fibers is the same, the density becomes smaller and the thickness of the fibrous layer becomes thicker in order of arrangement of square, regular hexagonal, random and hexagonal. As a result of measuring the light transmittance by changing the array structure, the light transmittance measured at the detector at the same position was almost similar regardless of the array structure. In the detectors D0, D1, D2 and D3, the maximum transmittance is shown in square, hexagonal and square, regular hexagonal and regular hexagonal array structure, and the minimum transmittance is hexagonal, random, hexagonal and square, and square array structure. However, the difference between the maximum transmittance and the minimum transmittance was almost the same within 1%. When the number of collagen fibers was the same, the light transmittance of the rectangular array structure decreased with increasing fiber layer thickness. And as the thickness increased, the light transmittance decreased more when the number of collagen fibers decreased. Conclusion : Even though the collagen array structure changed, the light transmittance is almost similar regardless of the arrangement structure. However, as the array structure was changed, the thickness of the collagen fiber layer changed, and as the thickness increased, the light transmittance decreased. In other words, the transparency of the corneal stroma is more closely related to the thickness of the fibrous layer than the array of collagen fibers.

• Journal of Korean Ophthalmic Optics Society
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• v.17 no.2
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• pp.119-126
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• 2012

Purpose: To study changes in coating and lens materials after chemically etched different polymer based glass lenses in short-term and ambient condition using hydrofluoric acid. Methods: Vinyl ester polymer (Lens A) and thiourethane polymer (Lens B), both dyed in gray 70%, were etched in hydrofluoric acid solution for 5, 10, or 15 min. The mechanical properties, degrees of damages in hard coating, anti-reflection coating, and other coatings, rates of refractive index and light transmission of both polymer types were evaluated. Results: Rates of refractive index of both lens types were not changed significantly after chemical etching. However, anti-reflection coatings and hard coatings were removed and lens surfaces were damaged. As a results, UV light transmission of lenses increased and mechanical properties decreased. Chemical etching notably changed various properties of thiourethane polymer materials. Conclusions: Depending on types of polymer materials, chemical reactions by hydrofluoric acid were dissimilar. Thus, various properties of les materials were altered differently.