• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.160-161
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• 2003

위상특이점이라고도 불리는 광 보텍스(optical vortex)를 포함한 빔은 파면의 특이성 때문에 많은 관심을 끌어왔다. 위상을 정의할 수 없는 위상특이점을 따라서는 빔의 동일위상파면이 소용돌이 형태를 가진다. 그 소용돌이 정도는 위상전하(topological charge) 라는 양으로 특징지을 수 있다. 광 보텍스는 선형 및 비선형적 특성에 대해 많은 연구가 이루어져왔다. 레이저 공진기를 변형하거나, 홀로그램이나 위상마스크에 레이저를 조사하여 보텍스를 발생시키는 방법 등의 여러 방법이 알려져 있다. (중략)

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.2
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• pp.372-377
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• 2016

Communication flow is changing rapidly. Recently, a range of wearable devices such as wearable glasses and wearable watch, have been launched. These kinds of wearable devices help people to live a more comfortable life. Wearable devices most have an antenna for wireless communication. This paper reports a transparent antenna that is made of an optically transparent material for wearable glasses. Transparent antenna can be applied to smart windows and will not disturb the view of user. IZTO/Ag/IZTO multilayer electrode has higher electrical and optical properties. This antenna is available because of its good electrical properties. This study measured the performance of the proposed transparent antenna, which is made of a multilayer electrode, applied to a lens. The proposed antenna was simulated with several substrates. The antenna impedance was matched with length and width of the antenna. The antenna's conductivity and transparency was measured using a HMS-3000 and UV-spectrometer. A 40nm thick Ag single layer antenna was fabricated on a flexible polyimide substrate for comparing the antenna performances. The fabricated antenna is useable at a frequency of 2.4-2.5GHz, which is suitable for Wifi communications and has peak gain of 2.89dBi and an efficiency of 34%.

• Journal of Korean Ophthalmic Optics Society
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• v.2 no.1
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• pp.111-126
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• 1997

I concluded as follows after analyzing the problem of the curriculum in the Department of Optical Science at a college of professional education for the purpose of training desireable opticians. The years required for competing a course of study at the Department of Optical Science at a college of professonal education have to be extended from the present two school years to three years for the short run and have to be extended to four years for the long run. The distribution ratio of subjects in the slate examination should be readjusted and the field of contect lens. Also the system of the slate examination should strengthen by adding practical processing test with the present selective written examination. The Curriculum of department of Optical Science curriculum at a college of professional education should be reorganized reinforce experiment and practice, namely, the subject for experiment and practice, such as Making of specific glasses and Test method of phorpter etc, should be reinforced. The knowledge for goods should be included in clinical training and it is reasonable to constitute the theory vs the practice in the ratio of five to five. The number of the Department of Optical Science should be increased two or more for per forty students and it is desirabled that only the professors who major optical Science or opthalmic medical science, or have Optician Licence should give lecture. The experiment a practice should be enlarged and it is necessary to secure or to adopt practice hours, practice site, machinery and parts, practice assistant and etc. It is reasonable that clinical training include the knowledge of goods, business practice and etc. and that a practice examiner has the qualification as an optician who has education background higher that the college of professional education.

• Journal of Korean Ophthalmic Optics Society
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• v.11 no.2
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• pp.115-119
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• 2006

Electromagnetic shielding, transparent ITO coating layers have deposited on ocular lens substrate by magnetron sputtering. We investigated the effect induced by the substrate temperature on coating layer. The characteristics of the coating layers were analyzed using surface profiler, four-point probe, XRD, spectrophotometer and Auger Electron spectroscopy. As substrate temperature became higher, carrier concentration was increased and transmittance in the visible region was increased, too.

• Journal of Korean Ophthalmic Optics Society
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• v.9 no.1
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• pp.1-9
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• 2004

In this study, we presented a research about the development of the phoropter simulation program for education using the 3-D virtual reality in order to study the ophthalmic optics rather efficiently. Especially, by putting the facility such as the refractive error analysis of the eyeball in the cyber tutor inside, we have made the learner to learn and confirm the present situation of refractive correction through refractive power of principal meridians. By organizing the system which induces the active involvement of the learner and showing the result of the execution to the learner intuitively, the implementation of the more efficient education-environment can be possible. Consequently, it is expected that this program will be greatly helpful for the optician training as well as the ophthalmic optics education. As a next phase of study, we will develope the development technique of this simulator more and extend the cyber tutor contents more and make the web service version of this program to be provided through the internet network in order to inspire the learning desire of the learner more and more.

• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.90-91
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• 2003

정사각형 (sqaure) 구조 미소공진기는 Q값이 큰 4-bounce whispering gallery mode (WGM)가 존재 할 수 있고, 외부 도파로와 표면감쇠파 결합을 통해 상호작용할 때, 결합 길이가 매우 길어질 수 있어, 광통신용 Add／Drop Filter, 광집적회로 등의 저문턱 미소공진기 레이저 등의 광소자 분야에 적용하려는 연구가 최근 진행되고 있다. 그러나 단일 경계면을 갖는 사각 공진기는 공간 모드가 매우 많은 multimode 특성을 띄기 때문에 응용에 있어 단점이 된다. (중략)

• Journal of Korean Ophthalmic Optics Society
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• v.20 no.3
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• pp.293-300
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• 2015

Purpose: To evaluate blue light hazards of LED lightings in an optical store with blue light radiance used as the quantitative indicators of photobiological hazard. Methods: The spectral radiance of each LED lightings was measured, and blue-light radiance and the corresponding maximum exposure time were calculated. Then each LED lighting was classified according to the risk group from IEC 62471 standard. Results: The yellow LED lightings used in showcases and white LED lightings used on ceilings and logo were classified into risk group RG0. But the white LED lightings used on showcases were classified into risk group RG1. The blue light radiances of white LED lightings used in showcases are dozens of times larger than that of fluorescent lamp. Conclusions: Using the value of the blue light radiance could quantitatively express the blue light hazard to various lightings. It was confirmed that white LED lightings for the showcases had high blue light hazards because of their high luminance and color temperature. Therefore, when replacing lightings in optical shop it is necessary to select the appropriate brightness and color temperature for eye health in the long term.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.919-920
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• 2012

• Proceedings of the KAIS Fall Conference
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• 2002.05a
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• pp.190-193
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• 2002

SiO₂, ZrO₂를 사용하여 안경 렌즈의 5충 코팅을 설계하였다. 제5층의 두께를 변화시킨 후 반사율을 계산하고, RGB의 반사율을 이용하여 반사된 빛의 색상을 시각화하였다. 이 논문에서는 제5충의 두께가 두꺼워지면서 반사광의 색상이 붉은 색상에서 푸른 색상으로 이동하였다. 색상의 분석은 Photosop5.0을 이용하였다.

• Proceedings of the Optical Society of Korea Conference
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• 2004.07a
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• pp.46-47
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• 2004