• 한국광학회지
• /
• 제28권1호
• /
• pp.28-32
• /
• 2017

본 논문에서는 LSPR 센서에 적용하기 위한 제한된 높이 100 nm에서 $TiO_2$, $SiO_2$의 다중층을 이용한 LSPR 센서를 디자인을 제안했다. LSPR 센서의 구조는 유전체 층과 나노 구조가 있는 금속층으로 디자인 하였다. 금속층은 금 박막 40 nm와 높이 40 nm, 주기 600 nm, 선폭 300 nm인 나노와이어 구조체를 올려놓은 구조로 디자인하였다. 유전체 층의 높이를 100nm로 제한하고, $TiO_2$, $SiO_2$가 반복되는 구조로 하여 반복층의 개수를 1~4개로 변경하면서 비교 분석하였다. 파장 가변형 SPR을 디자인하기 위해 각도를 75도로 고정하고 파장을 변화시켜 FEM방식으로 계산하였다. 결과로 굴절율이 고정되어 있을 때 다중층의 개수가 증가할수록 공명 파장이 짧아지는 현상을 확인 하였고, 파장의 변화에 더 민감하게 변화하는 것을 측정하였다. 다만, 다중층의 개수가 3개층 이상이 되면 변화하지 않는 것을 확인하였다.

• Archives of Pharmacal Research
• /
• 제9권4호
• /
• pp.211-214
• /
• 1986

A simultaneous determination method of alkaline earth metals was attempted with the conventional high performance liquid chromatographic system. Four cations, namely, magnesium, calcium, strontium and barium ion, were injected directly as aqueous solution into an eluent containing copper chloride solution and and were successfully separated and determined on a separating column (Zipax SCX, 4.6 mm i.d. ${\times}25$ cm length, Du Pont, USA) by using a variable wavelength UV detector. The linear calibration curves were obtianed in the range from $1.0{\times}10^{-4}M$ to $5.0{\times}10^{-4}M$ and the correlation coefficient of the calibration curve for each metal of magnesium and calcium in tap water. Alkaline earth metals were determined with the conventional high performance liquid chromatographic system.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2009년도 추계학술대회 논문집
• /
• pp.284-284
• /
• 2009

The LED of cultivation edible plants was compliance the variable of the photo-receptor pigment with the red light source and ultra red light source from long wave region. The mechanism of cultivation edible plants for each part was necessary the wavelength unit which is appropriate, the illuminant source, motor control and lens design of LED light source about plant. The photo-receptor pigment induces for a long daytime recognition, seed germination and anthesis etc, induction years exists in the state which is an inactivity within the cells and in compliance with the red light source to be converted in active

• 미생물학회지
• /
• 제20권1호
• /
• pp.21-26
• /
• 1982

The disinfection effects of sunlight and predacious microorganisms on enteria of Escherichia coli and Proteus vulgaris were examined in sewage water at 22 to $26^{\circ}C$. The test prganisms were disinfected by 4 to 5 logs during 6-hour a day exposure to sunlight for seven days. The effect was proportional to the light intensity and was proved to be dur to the action of the visible light of short wavelength which can transmit the soft glass of a flask glass. The predacious microorganisms decreased trhe test organisms by about 3 to 4 logs during 7 days. The complex actions of sunlight and predacious microorganisms were variable depending upon the test organisms, but the total effects of those enviromental factors were yet completely understood.

• 천문학논총
• /
• 제15권spc1호
• /
• pp.113-118
• /
• 2000

A magnetic cataclysmic variable has a rotating magnetic white dwarf which accretes matter from its late type companion. Kim & Beuermann (1995) presented a phenomenological model of the accretion from its surrounding structure e.g., a disk into the magnetosphere of the white dwarf, and presented results for the spin modulated X-ray spectrum and light curves. Using this model, we calculate the optical continuum and line emission which result from reprocessing of X-rays in the accretion stream within the magnetosphere. Penning (1985) suggested the observed spin-modulated radial-velocity variations might result from reprocession of X-rays in the disk. We, however, find the radiation can be originated from the magnetosphere accretion stream. We use the same geometrical model to calculate the optical and the X-ray behaviour. The results from the two wavelength bands are internally consistent. We conclude that this approach will increase the diagnostic accuracies of the results.

• 한국통신학회논문지
• /
• 제10권4호
• /
• pp.168-174
• /
• 1985

半導體 레이저의 出力 및 波長은 溫度에 대단히 敏感하다. 특히 헤테로다인光通信 씨스템이다. 光學用積密 度量衡器, 高分解能 스텍트로스코프 等測量 및 通信에서 發光源으로 使用하기 爲해서는 適當한 安定化 技術이 要求된다. 이 때 溫度의 安定은 絶對的이다 .따라서 本 硏究에서는 桓溫器의 溫度를 -27$-50^{\circ}$에서 +73$^{\circ}C$까지 임의 設定이 可能하게 하였으며 溫度 安定은 ${\pm}2m{\circ}K$보다 좋은 結果를 얻었다.

• ETRI Journal
• /
• 제28권1호
• /
• pp.1-8
• /
• 2006

A novel all-optical gain-controlled (AOGC) bidirectional amplifier is proposed and demonstrated in a compact structure. The AOGC function using fiber Bragg grating (FBG) pairs controls both directional signals independently, and combinations of optical interleavers and isolators suppress Rayleigh backscattering (RB) noise. The amplifier achieves high and constant gain with a wide dynamic input signal range and low noise figure. The performance does not depend on the input signal conditions, whether static-state or transient signals, or whether there is symmetric or asymmetric data traffic on bidirectional transmission. Transmission comparison experiments between invariable symmetrical and random variable asymmetric bidirectional data traffic verify that the all-optical gain control and bidirectional amplification functions are successfully combined into this proposed amplifier.

• 분석과학
• /
• 제30권1호
• /
• pp.20-25
• /
• 2017

An analytical method for determining potential endocrine disruptors (bisphenol A, 2-chlorophenol, 2,4-dichlorophenol, 2,4,6-trichlorophenol, pentachlorophenol, p-t-butylphenol, p-pentylphenol, p-hexylphenol, p-t-octylphenol, p-heptylphenol, nonylphenol) by solid-phase extraction (SPE) and High Perfomance Liquid Chromatography(HPLC) equipped with fluorescence and variable wavelength detector has been developed. The SPE process for sample concentration was performed on a commercially available Oasis HLB cartridge packed with polymeric sorbents. The effect of elution solvent and elution volume on the recoveries of the analytes were investigated with HPLC. Average recovery of >85% was achieved with 60mg sorbents using 5mL of methanol as elution solvent. Phenolic compounds in canned drinks, beverages and water samples were surveyed by this proposed method.

• Journal of the Optical Society of Korea
• /
• 제10권4호
• /
• pp.169-173
• /
• 2006

This paper describes an efficient optimal design method for an arrayed waveguide grating (AWG) having MMI coupler with flattened transfer function. The objective function is the norm of the difference between calculated and target spectra. To analyze the AWG transfer function, the Fresnel-Kirchhof diffraction formula was employed and the design variable was optical path difference of each array waveguide. The (1+1) Evolution Strategy was applied to an eight-channel coarse wavelength division multiplexing (CWDM) AWG as the optimization tool. For obtaining a broadened spectrum, we use a MMI coupler and the variation in optical path difference at each array waveguide changes the shape of the transfer function to obtain the optimal spectrum shape.

• 한국광학회:학술대회논문집
• /
• 한국광학회 2001년도 제12회 정기총회 및 01년도 동계학술발표회
• /
• pp.152-153
• /
• 2001

파장 가변형 광 필터와 파장 선택형 광 스위치는 파장분할다중 광통신 및 광 교환 시스템을 구현하는데 매우 중요한 소자들 중의 하나이다. 특히 음향광학효과를 이용한 파장 가변형 광 필터(AOTF ： Acousto-Optic Tunable Filter)는 150nm 이상의 넓은 파장 가변범위, 1.5nm이하의 좁은 통과대역폭, 수 $\mu\textrm{s}$ 정도의 비교적 빠른 스위칭 속도 그리고 여러 개의 파장 채널을 동시에 선택할 수 있는 장점들을 가지고 있지만, 한편으로 표면 음향파(SAW： Surface Acoustic Wave) 구동에 필요한 RF 파워와 부 모드 (sidelobe)가 비교적 크다는 단점 때문에 실용화에 많은 제약을 받아왔다. (중략)