• Title/Summary/Keyword: 광파장

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Study on the temperature and optical wavelength sensing composites as smart materials (온도 및 광파장을 감지하는 스마트 복합재료에 관한 연구)

  • ;Delbert E. Day;James O. Stoffer
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.6 no.3
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    • pp.439-448
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    • 1996
  • The possibility of application or the transparent BK10 glass fiber/PMMA composites as a temperature-or wavelength-sensors was studied. Measurement of diameter and refractive index for glass fibers to be reinforced to PMMA as a function of drawing speed and temperature was done and the appropriate coating methods and solvent for coupling agent was researched. $T_{max%}$ value at which the maximum transmission for the composites occurs could be controlled to be in $31~50^{\circ}C$ by the processing factors such as fiber diameter, fiber vol%, molecular wt. of PMMA. Furthermore, with different wavelength other than 589.3 nm, the $T_{max%}$ value could be controlled to be in $35~55^{\circ}C$. For the sensibility of wavelength for the composites, there was not a wavelength ($\lamda_{max%}$) showing maximum transmission.

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Preparations of z-cut LiNbO$_3$ Optical Waveguide for High Refractive Index Change and Properties of Insertion Loss as a Function of Ti Thickness (高 굴절율화된 z-cut LiNbO$_3$ 광도파로 제작 및 Ti 두께에 따른 삽입손실특성)

  • 김성구
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.36D no.5
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    • pp.69-79
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    • 1999
  • In this paper, we proposed a diffuion model of Ti diffused lithium niobate optical waveguide for fabricating waveguides with high refractive index and compared with conventional one. The achivement of low optical insertion loss between waveguide interface and single mode fibers was discussed as a function of Ti thickness for $\lambda$=1.55$\mu\textrm{m}$ The proposed diffusion method exhibited higher refractive index waveguide than conventional one for $\lambda$=0.6328$\mu\textrm{m}$ We have achieved the total fiber-waveguide-fiber insertion loss as low as 0.5dB/cm in z-cut and 1$\pm$0.5dB/cm in x-cut for both TM and TE mode of Mach-Zehnder interferometric waveguide in the range of Ti thickness 1000-1400$\AA$ for $\lambda$=1.55$\mu\textrm{m}$ From these results, this diffusion model for making a low loss waveguide can be used for low-power-modulators and switches.

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Effects of Light on Activities of Antioxidative Enzymes in Hairy Root Cultures of phytolacca esculenta Houtte (자리공(Phytolacca esculenta van Houtte) 모상근배양에서 항산화효소의 활성에 미치는 광의 영향)

  • 양덕조;김용해;권진이;최철희;양덕춘
    • Korean Journal of Plant Tissue Culture
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    • v.22 no.2
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    • pp.71-76
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    • 1995
  • The effects of light on the activities of several antioxidative enzymes, catalase (CAT), superoxide dismutase(SOD), ascorbate oxidase(AO), and peroxidase(POD) were examined in the hairy root cultures of Phytolacca esculenta van Houtte induced by Agrobacterium tumefaciens $A_4$T. Activities of CAT, SOD, and AO were significantly decreased with incresing light intensity (500-2,000 lx). The activity of AO under high light condition (2,000 lx)was decreased by 92% compared to the dark condition. The activities of glutathoine peroxidase (GPO), ascorbate peroxidase (APO) and general POD were increased under lower light intensify below 500 lx. The activity of GPO under 2,000 lx was decreased by 85% compared to the dark condition. The activities of antioxidative enzymes were more decreased in blue light (400-500nm). The activities of antioxidative enzymes in blue light intensity were increased in lower light intensity below 30 lx, but decreased 21-70% under 200 lx. The activity of AO was decreased by 70% under 200 lx with increasing blue light intensity. Our results suggest that the activities of antioxidative enzymes in hairy roots might be inhibited by endogenous oxidants generated under the high blue light conditions.

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공진반사광 바이오센서를 이용한 심근경색 마커 감지 기술

  • Heo, Cheol;Kim, Bong-Gyu;Kim, Wan-Jung;Hong, Jong-Cheol;A, Chil-Seong;Kim, Sang-Hyeop;Seong, Geon-Yong
    • Proceedings of the Korean Vacuum Society Conference
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    • 2014.02a
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    • pp.127-127
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    • 2014
  • 인체 내 소량의 생체성분(혈액, 소변 등)을 감지하는 바이오센서 기술은 질병 진단뿐만 아니라 예방 및 관리로 의료서비스 확대, 개인 맞춤형 진료 및 의료비 감소 효과를 가져올 수 있는 기술이다. 광바이오센서는 광학적인 측정방법을 이용하여 다양한 생화학물질들의 상호 반응을 검출해 낼 수 있는 바이오센서로 현재 활발하게 연구가 진행되고 있다. 광 바이오센서는 생체성분 내에 존재하는 전하를 가진 많은 이온들 및 Salt 농도 등에 영향을 받지 않기 때문에 나노 와이어를 이용한 FET (field-effect transistor)형 바이오센서에 비해 많은 장점을 가지고 있다. 일반적으로 광 바이오센서는 형광물질, 인광물질, 발색물질, 방사선 물질 등의 발광물질을 인식물질에 표지하여 인식물질과 분석물질과의 반응유무를 표지된 발광물질의 광학 신호를 감지하여 분석물질을 검출해내는 표지식 광 바이오센서 기술이 상용화되고 있다. 그러나 이러한 분석 방법은 민감도는 우수하지만 분석 시간이 매우 느리고, 고가의 분석 장비 및 복잡한 제조 공정 등의 단점들을 가지고 있다. 이러한 단점들을 극복하기 위하여 생화학 반응 유무를 표지물질 없이 광학적 방식으로 직접 측정할 수 있는 비표지식 광 바이오센서 기술이 최근 들어 많이 연구되고 있다. 본 논문에서는 광파장 이하의 주기를 가진 주기적 공진 격자 표면에서 일어나는 바이오 항원-항체 반응에 대한 공진 반사 파장을 측정하여 생체성분 내에 존재하는 바이오 항원을 고감도로 검출할 수 있는 비표지식 공진반사광 바이오센서 기술을 소개하고자 한다. 공진반사광 바이오센서를 이용하여 human serum내에 존재하는 심근경색 마커인 troponin I (cTnI), creatine kinase MB (CK-MB), myoglobin (MYO)을 0.1 ng/mL 이하의 농도까지 고감도로 측정할 수 있었다.

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WDM Optical Network Restoration and Spare Resource Planning using Multiple Ring-Cover (다중 링 구조를 이용한 WDM 통신망 복구 및 자원 예약 기법)

  • Hwang, Ho-Young;Lim, Sung-Soo
    • The KIPS Transactions:PartC
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    • v.12C no.6 s.102
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    • pp.891-900
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    • 2005
  • This paper studies network recovery methods for WDM optical mesh networks, concentrating on improving spare resource utilization. The resource efficiency can be obtained by sharing spare resources needed for network recovery. To improve the sharability of spare resources in WDM networks, methods to share backup paths us well as spare capacity should be studied. The proposed method in this paper uses multiple ring-covers and this method provides fast and simple recovery operation by exploiting the characteristics of logical ring topology, and also provides efficient resource utilization by using multiple distributed backup paths to improve the sharability of overall spare resources in the networks. This method can provide layered reliability to network service by enabling hierarchical robustness against multiple failures. The performance results show that the proposed method provide improved resource efficiency for single failure and enhanced robustness for multiple failures.

Photosterilization effects of microbial cells by titanium oxide catalyzer ($TiO_2$ 촉매를 이용한 광살균 효과)

  • Joo, Hyun-Kyu
    • Applied Biological Chemistry
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    • v.35 no.4
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    • pp.294-299
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    • 1992
  • In order to examine the effect of $TiO_2$ on photosterilization of microorganism. Proper content of $TiO_2$, illumination time, wave length specificity and cell concentration were investigated for photosterilization of E. coli, B. subtilis and S. cerevisiae. The amount of $TiO_2$ for photosterilization of E. coli was effective in the range of $5{\sim}20\;mg%$. The sterilization time was reduced when the low wave length below 400 nth was not cut off by glass, but the catarizing effect of $TiO_2$ was similar to overall wave length. The photosterilization effects by $TiO_2$ addition was recognized among S. cerevisiae, E. coli and B. subtilis in that order. The photosterilization time of S. cerevisiae was considerably reduced at $10^4/ml$ cell concentration compared to $10^5/ml$.

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The effect of LED light wavelength on the growth of fingerling Sebastes inermis (볼락(Sebastes inermis)치어의 성장에 미치는 LED 광파장의 영향)

  • Shin, Hyeon-Ok;Heo, Min-A;Heo, Gyeom
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.51 no.2
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    • pp.179-187
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    • 2015
  • Experiments designed to measure the effect of LED (light-emitting diode) light wavelength on the growth of fingerling rockfishes (Sebastes inermis) were conducted. Fingerling rockfishes (average body weight of individual: 1.13g) were divided into two groups by wavelength of the LED light [light power: 1,620 mW; wavelength: 518 nm (green color), 622 nm (red color)]. Triplicate groups of 180 individuals were reared over 7 weeks. Lighting duration was 14 hours from 06:00 to 20:00. A water tank exposed on the natural light in a room through the windows was used as a control. At results of the first experiment [initial average body weight (BW) of individual: 1.13 g; standard deviation (SD): 0.13 g], the final individual BW exposed on the green color was increased 0.39 g than the red color, and decreased 0.12 g than the natural light in the room. At results of the second (initial individual BW: 5.07 g; SD: 0.70 g) and the third experiment (initial individual BW: 10.67 g; SD: 0.67 g), the final individual BW exposed on the green color was increased 1.07 g and 2.55 g than the red color, respectively, and increased 0.57 g and 0.84 g than the natural light, respectively. The relative growth rate of the green color was higher about 8% significantly (p<0.05) than the natural light. In the case of the red color the relative growth rate was lower significantly (p<0.05) than the natural light.

A time delay measurement of a chirped fiber grating by using bidirectional modulation of an optical intensity modulator (광변조기의 양방향 변조를 이용한 chirped fiber grating의 시간지연 측정법)

  • Jeon, Geum-Soo;Lee, Yong-Gu;Ban, Jae-Kyung;Heo, Hyun
    • Korean Journal of Optics and Photonics
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    • v.13 no.6
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    • pp.510-514
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    • 2002
  • A simple method for a time delay measurement of a chirped fiber grating by using bidirectional modulation of a Mach-Zehnder modulator has been proposed. The bidirectionally modulated light with time difference makes an interference fringe in the RF domain. The time delay of a chirped fiber grating can be obtained by measuring the period of the RF interference fringe for different wavelengths. We have measured the time delay of a chirped fiber grating with a chirped length of 5 cm and a bandwidth of 3.16 nm. The average slope of the time delay has been measured to be 183 ps/nm and its uncertainty has been less than $\pm$1.7%.

40channel Arrayed Waveguide Grating with O.75delta% Refractive Index (0.75Δ% 굴절율차를 가진 40채널 광파장 다중화 및 역다중화 소자 제작 및 특성)

  • Moon, H.M.;Choi, G.S.;Lee, K.H.;Kim, D.H.;Lee, J.H.;Lee, D.H.;Oh, J.K;Kwak, S.C.;Kwon, O.K.;Kang, D.S.;Choi, J.S.;Jong, G;Lee, H.Y.
    • Korean Journal of Optics and Photonics
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    • v.16 no.3
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    • pp.196-200
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    • 2005
  • A 40 channel arrayed-waveguide grating (AWG) filter operating in C-band and L-band wavelength regions has been fabricated using PLC (Planar Lightwave Circuit) processes with 0.75 refractive index difference. Its design was optimized for matching the center wavelength with the ITU-recommended wavelength. The characteristics of the fabricated C-band AWG are as follows; average insertion loss < 2.5 dB, polarization-dependent loss < 0.3 dB, non-adjacent crosstalk >35dB, and the loss uniformity of 0.8 dB. In the L-band AWG, wavelength accuracy is below 0.02nm.

Characteristics of out-band dispersion of OADM using cascaded FBG in WDM/SCM systems (WDM/SCM시스템에서 Cascaded FBG를 이용한 OADM의 Out-band 분산 특성)

  • 원훈재;전금수;반재경
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.41 no.8
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    • pp.51-57
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    • 2004
  • We have analyzed the effect of out-band dispersion in the cascaded fiber Bragg Elating(FBG) based optical add-drop multiplexers(OADM) when bypassed wavelengths contain SCM signals. In order to compute this impairment the dispersion characteristics of FBG have been analytically calculated by solving their coupled wave equations, and the Fourier method is applied to IMD analysis. The out-band dispersion effects over WDM/SCM signals are analyzed under different and common system situations as: ITU channel spacing(100, 50, 25 GHz), channel density parameter, frequency extension of the SCM plan, modulation characteristics, FBG length, etc. From this results, the transport of WDM/SCM signals in future DWDM transport networks could be limited by this effect which has to be taken into account for designing future networks.