• ETRI Journal
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• 제25권2호
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• pp.73-80
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• 2003

This paper describes an effective method for forming silicon oxide on silica-on-silicon platforms, which results in excellent characteristics for hybrid integration. Among the many processes involved in fabricating silica-on-silicon platforms with planar lightwave circuits (PLCs), the process for forming silicon oxide on an etched silicon substrate is very important for obtaining transparent silica film because it determines the compatibility at the interface between the silicon and the silica film. To investigate the effects of the formation process of the silicon oxide on the characteristics of the silica PLC platform, we compared two silicon oxide formation processes: thermal oxidation and plasma-enhanced chemical vapor deposition (PECVD). Thermal oxidation in fabricating silica platforms generates defects and a cristobalite crystal phase, which results in deterioration of the optical waveguide characteristics. On the other hand, a silica platform with the silicon oxide layer deposited by PECVD has a transparent planar optical waveguide because the crystal growth of the silica has been suppressed. We confirm that the PECVD method is an effective process for silicon oxide formation for a silica platform with excellent characteristics.

• 조명전기설비학회논문지
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• 제17권5호
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• pp.1-7
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• 2003

배광분포를 측정함으로써 조명기구의 모든 광학적 특성을 계산해낼 수 있으며 이를 바탕으로 조명설계를 수행할 수 있다. 이러한 일련의 측정과 해석을 위해 배광측정기의 개발시에 배광해석용 소프트웨어 개발이 동시에 이루어져야 한다 연구진이 현재 개발하고 있는 소프트웨어는 조명기구의 광학적 특성을 파악하는 데 있어, 상당히 유용한 기능들을 포함하고 있다. 또한, 조명설계에 있어 근본적인 문제 해결의 과학적 검증을 제공함은 물론, 더 나아가 조명계산에 있어 하나의 표준을 마련하는 데 기여할 수 있을 것으로 보인다.

• 한국통신학회논문지
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• 제33권12A호
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• pp.1251-1260
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• 2008

Diffuse wireless optical communication offers more robust optical links in terms of coverage and shadowing than line-of-sight links. However, traditional diffuse wireless infrared (IR) transceiver systems are more susceptible to multi-path distortion and great power decrease, which results in limiting high-speed performance. Multi-beam is an effective technique to compensate for multi-path distortion in a wireless infrared environment. The goal of this paper is to analyze the transmission characteristics by replacing traditional diffuse system (TDS) which contains single wide angle transmitter and single element receiver by system consisting of three-beam transmitter and non-imaging receiver (TNS) attached with compound parabolic concentrator (CPC). In the simulation, we use the recursive model developed by Barry and Kahn and build the scenario based on 10 different cases which have been listed in Table 1. Moreover, we also check the reliability of the TNS diffuse link channel by BER test on the basis of different receiver positions and room sizes. The simulation results not only show the basic transmission characteristics of TNS diffuse link, but also are references to design more efficient and reliable indoor infrared transmission systems.

• 한국전자파학회논문지
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• 제18권12호
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• pp.1383-1390
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• 2007

본 논문에서는 파이버 브래그 격자 필터로 구성된 전광 다중화기의 온도 특성에 대해 연구하였다. 전광 다중화기의 온도 특성을 분석하기 위해서, 전광 다중화기의 출력단에 대한 온도 응답을 수치 해석하였으며, 실험을 통하여 출력 스펙트럼을 측정하였다. 그 결과로부터 $-30{\sim}90^{\circ}C$ 범위 내에서 전광 다중화기의 출력 스펙트럼의 중심 파장은 약 0.01230 nm/$^{\circ}C$로 변화함을 알 수 있었다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 추계학술대회논문집
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• pp.693-698
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• 2008

For designing intensity modulation type optical microphone, the irradiance distribution which can be applied to inclined-cut geometrical configuration is suggested. The model is important in analysis of response characteristics f3r intensity modulation type optical microphone. To overcome low sensitivity problem in intensity modulation type optical microphone, inclined-cut optical fiber is considered here. Based on optical geometry, the inclined-cut optical fiber sensor is designed and fabricated. The experiments are carried out to evaluate sensor performance.

• 한국소음진동공학회논문집
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• 제18권12호
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• pp.1270-1277
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• 2008

For designing intensity modulation type optical microphone, the irradiance distribution which can be applied to inclined-cut geometrical configuration is suggested. The model is important in analysis of response characteristics for intensity modulation type optical microphone. To overcome low sensitivity problem in intensity modulation type optical microphone, inclined-cut optical fiber is considered here. Based on optical geometry, the inclined-cut optical fiber sensor is designed and fabricated. The experiments are carried out to evaluate sensor performance.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2008년도 한국우주과학회보 제17권2호
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• pp.27.3-28
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• 2008

In this study, we report a new Monte Carlo ray tracing technique for estimating GOCI (Geostationary Ocean Color Instrument) radiative transfer characteristics and imaging performance simultaneously. First, a full scale GOCI optical model was constructed with measured characteristics at the component level and placed in the geostationary orbit. An optical model of approximated GOCI target area centered at the Korean penninsular was then built using the USGS coastal line data and representative land and sea surface reflectivity data. The light rays launched from a simulated sun model travel to the Earth surface, where they are reflected and scattered. Some of the light rays that are headed to the GOCI model in the orbit were selected and traced, as they have entered into the GOCI aperture. As they pass through each GOCI optical part, the ray path and intensity are adjusted according to the measured characteristics for reflection, transmission, refractive index and surface scattering. The ray-traced imaging and radiative transfer performance indicators confirm that the computer generated GOCI optical system with measured characteristics can be used for in-orbit operation simulation following the designed measurement sequence. The computational technique and its implications as a operation support tool are discussed.

• 유통과학연구
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• 제8권2호
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• pp.23-32
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• 2010

본 연구는 안경 프랜차이즈 산업에서 가맹사업자가 인지하는 가맹본부와의 의사소통, 지원, 갈등, 공정성과 같은 관계특성이 가맹본부와의 관계만족에 미치는 영향에 관하여 분석하였다. 안경 프랜차이즈 산업 가맹점들을 조사대상으로 한 실증분석 결과 의사 소통과 관계만족, 관계만족과 장기적 결속간의 가설들이 지지되었다. 공정성에 대해서는 선행연구와 다른 결과가 나타나서 이에 대한 현상적인 해석을 시도하였다. 이러한 결과에 따라 안경프랜차이즈 산업에서는 원활한 의사소통이 매우 중요하며, 이를 위해서는 가맹본부의 특성과 가맹사업자의 특성을 이해하고 이를 반영한 적합성에 대한 노력이 선행되어야 한다는 결론이 도출되었다.

• 한국광학회:학술대회논문집
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• 한국광학회 2009년도 동계학술발표회 논문집
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• pp.451-452
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• 2009

• 한국광학회:학술대회논문집
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• 한국광학회 1990년도 제5회 파동 및 레이저 학술발표회 5th Conference on Waves and lasers 논문집 - 한국광학회
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• pp.26-28
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• 1990

Cw arc 램프로 펌핑하는 Alexandrite 레이저의 형광을 optical Spectrum Analyzer를 이용하여 측정하였다. Vibronic 천이에 해당하는 광대역 형광 스펙트럼이 관측되었고, arc 램프 입력에 따른 peak 형광의 세기 및 peak intensity 파장의 입력 power 의존성을 조사하였다. 형광의 세기는 입력 power에 따라 0.16 /kw의 비율로 증가하였고, peak intensity 파장은 입력 power가 5kw 까지는 5 nm/kw 비율로 장파장쪽으로 이동하였다.