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김영찬,김기복,이대수,이민우,안재욱,Kim, Young-Chan,Kim, Ki-Bok,Yee, Dae-Su,Yi, Min-Woo,Ahn, Jae-Wook 한국광학회 2008 한국광학회지 Vol.19 No.5
본 논문에서 비동시성 광샘플링(asynchronous optical sampling; AOS) 방식을 이용하는 고속 고분해 테라헤르츠 시간영역 분광(terahertz time domain spectroscopy; THz-TDS)을 시연한다. 모터로 구동되는 선형 스테이지를 사용하지 않고, 약간 다른 반복 주파수를 갖는 두 대의 펨토초 레이저를 각각 테라헤르츠파 발생과 검출에 사용하여 고속으로 10 ns의 시간축 상의 신호를 획득하고 fast Fourier transformation(FFT)을 통하여 100 MHz의 주파수 분해능을 갖는 고분해 분광을 구현한다. Cross-correlation 방법에 의해 시간 분해능은 278 fs으로 측정되었다. 또한, 본 분광기를 이용하여 수증기의 투과 스펙트럼을 측정하고 흡수선들을 분석하였다. High-speed high-resolution terahertz time-domain spectroscopy (THz-TDS) is demonstrated using the asynchronous-opticalsampling (AOS) method. A time-domain signal with a 10-ns time window is rapidly acquired by using two femtosecond lasers with slightly different repetition frequencies to generate and detect a terahertz pulse wave, without a mechanical delay stage. The spectrum obtained by the fast Fourier transformation (FFT) of the time-domain waveform has a frequency resolution of 100 MHz. The time resolution of our spectrometer is measured using the cross-correlation method to be 278 fs. A transmission spectrum of water vapor is measured and the absorption lines are analyzed in the frequency range from 0.1 to 1.2 THz.
제희정(Hee-Jeong Je),안재욱(Jae-Wook Ahn),윤혜숙(Hae-Suk Yoon),김민근(Min-Keun Kim),류재산(Jae-San Ryu),홍광표(Kwang-Pyo Hong),이상대(Sang-Dae Lee),박영훈(Young-Hoon Park) 한국원예학회 2015 원예과학기술지 Vol.33 No.5
Powdery mildew (PM) caused by Podosphaera aphanis is a major disease that can result in significant yield losses in strawberry (Fragaria × ananassa Duchesne). For preventing PM, pesticides are usually applied in strawberry. In this study, molecular markers were developed to increase breeding efficiency of PM-resistance cultivars by marker-assisted selection (MAS). An F₂ population derived from a cross between PM-resistance ‘Seolhyang’ and PM-susceptibility ‘Akihime’ was evaluated for disease resistance to PM and RAPD (random amplification of polymorphic DNA)-BSA (bulked segregant analysis). Among 200 RAPD primers tested, OPE10 primer amplified a 311bp-band present in with 331bp. Sequence alignment performed for searching polymorphisms and six single nucleotide polymorphism (SNP) were found in amplified regions. To develop polymorphic marker for distinguishing between resistant and susceptible, RAPD was converted to cleaved amplified polymorphic sequence (CAPS) marker. Among restriction enzymes associated with six SNPs, Eae I (Y/GGCCR) was successfully digested to 231bp in susceptible. The results suggest that the selected CAPS marker could be used for increasing efficiency of selecting powdery mildew resistant strawberry in breeding system.