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Jeong, Jun Hyeok,Choi, Sungwook,Lee, Seul-Lee,Jeong, Sun Jae,Christian, Nouaze Joseph,Kim, Jihoon,Kang, Hyun Wook,Nam, Seung Yun,Oh, Junghwan,Lee, Yong Wook American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.11
<P>In this paper, we demonstrated a polarimetric fiber vibration sensor based on a polarization-diversified loop (PDL) with short polarization-maintaining photonic crystal fiber (PM-PCF) as a sensor head and investigated the dependence of its frequency response on the sensing fiber length. The fabricated PM-PCF vibration sensor is composed of a polarization beam splitter for forming the PDL, PM-PCF as a sensor head, and two wave plates such as a quarter-wave plate and a half-wave plate. A laser diode and a photodetector were also utilized for intensity-based vibration measurement. In particular, two kinds of PM-PCF segments with fiber lengths of similar to 6 and similar to 10 cm were employed to explore the effect of the sensor head length on the sensor frequency response. The frequency response was examined over 1-3000 Hz using a piezoelectric transducer that can apply single-frequency vibration to the sensor head. Every measured frequency response showed a resonance peak at each sensor head length, and cut-off frequencies were measured as similar to 1240 and similar to 794 Hz for PM-PCF lengths of similar to 6 and similar to 10 cm, respectively. That is, a higher cut-off frequency was obtained in a shorter sensor head length. Moreover, it was observed that the sensor head length dependence of the frequency response was maximized in a frequency range from 1000 to 2400 Hz and faded away beyond 2400 Hz. From the measurement results, it is concluded that the short sensor head can provide higher normalized sensitivity, i.e., better signal to noise ratio, at frequencies higher than the resonance frequency, let alone convenience of installation and in sensitiveness to external perturbations in a PDL-based PM-PCF vibration sensor. The phase shift per unit strain and the minimum detectable strain perturbation, regarded as sensitivity and resolution, were measured as similar to 0.377 mrad/mu epsilon and similar to 0.16 n epsilon/Hz(1/2) at 2000 Hz for similar to 6-cm-long PM-PCF, respectively.</P>
Optical spectroscopy of the carrier dynamics in LaVO3/SrVO3superlattices
Jeong, D. W.,Choi, Woo Seok,Kang, T. D.,Sohn, C. H.,David, A.,Rotella, H.,Sirenko, A. A.,Lee, Cheol Hyeok,Kim, Jae H.,Lü,ders, U.,Prellier, W.,Kim, Y.-J.,Lee, Yun Sang,Noh, T. W. American Physical Society 2011 Physical review. B, Condensed matter and materials Vol.84 No.11
( Jeong Han Kim ),( Yun Jung Choi ),( Hee Won Moon ),( Soon Young Ko ),( Won Hyeok Choe ),( So Young Kwon ) 대한간학회 2013 Clinical and Molecular Hepatology(대한간학회지) Vol.19 No.4
Background/Aims: Quantification of the hepatitis B surface antigen (HBsAg) is increasingly used to determine the treatment response in patients with chronic hepatitis B (CHB). However, there are limited data about the clinical implications of Quantification of HBsAg long-term nucleoside analogue treatment for CHB. We investigated the clinical correlation between HBsAg level and clinical course in patients with CHB who are treated long-term with nucleoside analogues. Methods: Patients with CHB who started lamivudine or entecavir monotherapy before June 2007 were enrolled. HBsAg was quantified at baseline, at 6 months, and at 1, 2, 3, 4, and 5 years of treatment. We compared data between the groups according to the presence or absence of a virological response (VR) and resistance. Results: Forty-eight patients were analyzed. There was no definite reduction in HBsAg level during the early period of treatment; differences in HBsAg levels between baseline and each time point were significant only at 5 years (P=0.028). In a subgroup analysis, this difference was significant only in non-resistant patients at 5 years (P=0.041). Conclusions: There was no definite decrease in the HBsAg level during the early period of nucleoside analogue treatment, with long-term treatment being required to observe a significant reduction.
Mapping the distribution of invasive forest pest in K-SDM
Yun Seomoon,Sang-Yoon Kim,Hyun Soo Park,Ji-Young Lee,Jae-In Oh,June-Hyeok Jeong,Young-Seuk Park,Dae-Seong Lee,Yang-Seop Bae,Tak-Gi Lee,Seunghwan Lee,Jinbae Seung,Jong Kyun Park,Jong Bong Choi,Bong-Kyu 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
금번 연구를 통해 외래산림해충 확산 분석 플랫폼 K-SDM (K-SDM)의 해충 분포 기능이 개발되었다. 해충 분포를 보여주는 기능은 2가지로 구현되며, 조사 자료를 바탕으로 현재 국내의 해충 분포를 나타내는 “외래산림 해충분포”기능과 데이터를 분석하여 예측되는 미래의 해충 분포를 제공하는 “외래산림해충예측”기능이 있다. “외래산림해충분포”는 조사자에 의해 현장에서 구축된 DB 현황을 지도상에 수치로 나타내며, 입력 기간, 해충 종 별로 구분이 가능하여 원하는 해충종의 분포를 선택하여 볼 수 있다. 지도 좌측에는 각 도별로 조사된 해충 개체수의 통계를 도표로 제공하여 수치상으로도 해충 분포를 파악할 수 있다. “외래산림해충예측”은 DB를 분석 하고 미래 기후 시나리오를 적용하여 도출한 미래의 해충 예측 분포도를 사용자에게 제공되며, 미리보기 이미지 와 함께 원본자료가 첨부되어 좀 더 자세한 정보를 열람할 수 있다. 본 플랫폼의 해충 분포 기능은 최근 기후변화 등으로 외래산림해충의 발생이 증가하는 추세에 맞춰 이들의 현재 분포와 미래의 분포양상을 조기 파악하여 이를 통한 추후 조기 방제 및 대응책 마련 등에 크게 기여할 것으로 기대된다.