• 산업기술연구
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• 제28권A호
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• pp.163-166
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• 2008

In this paper, the swept source optical coherence tomography system has realized using a free-space interferometer based on a beam splitter. Personal computer has completed the control for tunable wavelength laser digitally and the B-scan motor as well. From each experiment for an onion and a salmon egg, we confirmed that the in vivo epidermal cross-sectional images for them can be obtained appropriately.

• Journal of the Optical Society of Korea
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• 제15권3호
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• pp.293-299
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• 2011

In this study, we demonstrated Fourier-domain/swept-source optical coherence tomography (FD/SS-OCT) at a center wavelength of 800 nm for in vivo human retinal imaging. A wavelength-swept source was constructed with a semiconductor optical amplifier, a fiber Fabry-Perot tunable filter, isolators, and a fiber coupler in a ring cavity. Our swept source produced a laser output with a tuning range of 42 nm (779 to 821 nm) and an average power of 3.9 mW. The wavelength-swept speed in this configuration with bidirectionality is 2,000 axial scans per second. In addition, we suggested a modified zero-crossing method to achieve equal sample spacing in the wavenumber (k) domain and to increase the image depth range. FD/SS-OCT has a sensitivity of ~89.7 dB and an axial resolution of 10.4 ${\mu}m$ in air. When a retinal image with 2,000 A-lines/frame is obtained, an acquisition speed of 2.0 fps is achieved.

• 한국물환경학회지
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• 제22권4호
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• pp.648-657
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• 2006

Characteristics of water quantity and quality of the Anyangcheon were analyzed through many field measurements and the distributed hydrologic simulation model, Soil and Water Assessment Tool (SWAT). Event mean concentrations (EMCs) and baseflow mean concentrations were calculated from the data and the daily runoff were simulated by SWAT. The runoff was divided into the direct runoff and the baseflow. Using those values and quantity and quality data of release from the wastewater treatment plant (WWPT), unit loads of BOD, COD, SS, $NO_2-N$, $NO_3-N$, $NH_3-N$, and Dis-P were derived. EMCs of BOD and SS were even higher than the baseflow mean concentrations. The total runoff from October to April (7 months) of 2004 was just 13.5%, since the rainfall usually is concentrated in summer season. Futhermore BOD and SS were loaded during the event by 50.9% and 70.9%, respectively and over three quarters of total COD, $NO_2-N$, $NO_3-N$, $NH_3-N$, and Dis-P were flowed into the Anyangcheon during the remaining period. Therefore, the efficiency of WWPT for COD, $NO_2-N$, $NO_3-N$, $NH_3-N$, and Dis-P should be intensified from Oct. to Apr. and the runoff quality management of BOD and SS should be planned during the summer season.

• 산업기술연구
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• 제28권B호
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• pp.235-238
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• 2008

In this paper, we have developed wavelength swept laser system for the swept source optical coherence tomography(SS-OCT). A laser is constructed by using the two SOAs parallel configuration, fiber Fabry-Perot tunable filter(FFP-TF). The wavelength sweeps are repetitively generated with the repetition period of 50Hz. The wavelength tuning range of the laser is more than FWHM of 80nm centered at the wavelength of 1310nm and the line-width of the source is 0.12 nm.

• 센서학회지
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• 제21권1호
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• pp.68-74
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• 2012

In this paper, Frequency Domain Mode Locked(FDML) wavelength swept laser with 55.027 kHz sweeping speed and 125 nm sweeping range has realized, and also a new method for recalibrating a nonlinear frequency sweeping of a swept laser has proposed. The Swept Source-Optical Coherence Tomography system using the proposed method has performed. For a mirror surface, the system showed the very clean 2-dimensional image and the advanced image speed of 7 frames per sec compared to the previous recalibration method.

• 센서학회지
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• 제20권1호
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• pp.46-52
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• 2011

In this paper, the swept source-optical coherence tomography system using frequency domain mode locked(FDML) laser has realized. The FDML swept source laser showed 55.03 kHz sweeping speed, 125 nm sweeping range, and 9 mW output optical power, which are the superiority of FDML laser compared to previous swept source lasers. Also, through the cross-sectional image captured at 5 frames per second for a mirror, a 1 mm-thickness glass plate, and a thumb bottom, the performance of the system has demonstrated.

• 한국육종학회지
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• 제51권4호
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• pp.475-481
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• 2019

'늘찬'은 '석량풋콩'과 '장엽콩'의 후대인 SS91501-9-1-1를 모본으로 '목포17호'와 '신팔달콩2호'의 교배후대인 SS96205을 부본으로 1998년에 인공교배하여 계통육종법에 의하여 선발된 품종이다. 2006~2008년 생산력검정시험에서 중립으로 병에 강하여 재배안정성이 높고 다수성으로 유망시되어 '밀양206호'의 계통명을 부여한 후 '09년에서 '11년까지 3년간 9개소에서 지역적응시험을 실시한 결과 중립 내병 내재해 우량계통으로 평가되어 품종보호출원 및 국가품종목록으로 등재하였다. '늘찬'은 유한신육형, 화색이 백색, 협색이 담갈색, 종실은 종피와 제색이 황색이면서 모양이 구형인 장류 및 두부용 콩품종이다. 개화기가 7월 30일, 성숙기가 10월 9일로 중만생종이며 경장은 '대원콩' 보다 4 cm 짧으며 주경절수가 14개로 같고, 백립중이 21.7 g으로 가벼운 특성을 지니고 있다. 검은뿌리썩음병은 다소 약하지만 불마름병과 콩모자이크바이러스에 저항성 품종이다. 두부가공특성은 '대원콩' 대비 밝기가 비슷한 정도였으며 경도도 '대원콩'과 비슷한 특성을 나타냈다. 메주 풍취와 청국장 풍취는 '대원콩'보다 약간 못하였으며 메주수율과 청국장 γ-PGA 함량이 '대원콩' 보다 우수하였다. 수량성은 지역적응시험 결과 전국 평균 2.95 ton/ha, 적응지역인 이모작 지대에서 3.07 ton/ha로 '대원콩'보다 약간 많은 다수성 품종이다.