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Park, Jaena,Hwang, Miyeon,Choi, ByeongHyeon,Jeong, Hyesun,Jung, Jik-han,Kim, Hyun Koo,Hong, Sunghoi,Park, Ji-ho,Choi, Yeonho American Chemical Society 2017 ANALYTICAL CHEMISTRY - Vol.89 No.12
<P>Owing to the role of exosome as a cargo for intercellular communication, especially in cancer metastasis, the evidence has been consistently accumulated that exosomes can be used as a noninvasive indicator of cancer. Consequently, several studies applying exosome have been proposed for cancer diagnostic methods such as ELISA assay. However, it has been still challenging to get reliable results due to the requirement of a labeling process and high concentration of exosome. Here, we demonstrate a label-free and highly sensitive classification method of exosome by combining-enhanced (SERS) and statistical surface Raman, scattering pattern analysis. Unlike the conventional method to read different peak positions and amplitudes of a spectrum, whole SERS spectra of exosomes were analyzed by principal component analysis (PCA). By employing this pattern analysis, lung cancer cell derived exosomes were clearly distinguished from normal cell derived exosomes by 95.3% sensitivity and 97.3% specificity. Moreover, by analyzing the PCA result, we could suggest that this difference was induced by 11 different points in SERS signals from lung cancer cell derived exosomes. This result paved the way for new real-time diagnosis and classification of lung cancer by using exosome as a cancer marker.</P>
전력계통 진동 억제를 위한 회전형 변압기 속도제어에 관한 연구
안병현(Byeonghyeon An),김태훈(Tae-Hun Kim),박재덕(Jaedeok Park),박태식(Tae-Sik Park) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
북유럽 슈퍼그리드, 중동 슈퍼그리드 등 계통 연계를 통해 경제적인 이득과 공급신뢰도를 높이려는 노력이 증가하고 있으며 이에 따라 계통 연계 시스템의 안정성에 관한 연구가 주목받고 있다. 특히, 저주파수 진동은 발전기 축 비틀림 현상이나 발전기 출력 저하 등 전력계통 안정도에 악영향을 미치는 요소로 판단되고 있다. 저주파 진동은 전력 시스템의 특정한 조건에서 발생하며 진동이 느리게 감쇠되거나 점차 증폭되는 특징을 가지게 된다. 이러한 저주파 진동을 억제하기 위해 발전기 시스템의 PSS, Back to Back Converter 제어, FACTS 설비 등을 통해 억제할 수 있으나 제어의 어려움, 높은 투자비용 등의 문제점이 있다. 본 논문에서는 비동기 계통 연계 설비인 회전형 변압기를 이용한 저주파 진동 억제 방식을 제안하며 Matlab Simulnik 기반 시뮬레이션을 통해 성능을 검증하였다.
Byeonghyeon Kim,Jin Young Jeong,Seol Hwa Park,Hyun Jung Jung,Min Ji Kim 한국축산학회 2022 한국축산학회지 Vol.64 No.5
This experiment was conducted to investigate the effects of three different copper (Cu)sources (one inorganic and two organics) and levels (0, 50, and 100 mg/kg) on the growthperformance, Cu digestibility, fecal mineral excretion, serum mineral concentration, jejunalmorphology, and serum biochemical profile of growing pigs. A total of 42 male, growing pigs(31.08 ± 1.82 kg) were randomly assigned to seven treatments consisting of one negativecontrol (0 mg/kg of added Cu level) and treatments with copper sulfate (CuSO4), Cu-aminoacid complex (CuAA), and Cu-hydroxy-4-methylthio butanoate chelate complex (CuHMB)at 50 and 100 mg/kg each for 28 d. Pigs fed 50 or 100 mg/kg of Cu showed improved (p <0.05) average daily gain and feed intake. Although Cu excretion decreased (p < 0.01) in pigsfed 100 mg/kg of organic Cu sources compared to those fed CuSO4, there was no differencebetween the Cu sources in pigs fed 50 mg/kg. However, the apparent total tract digestibilityof Cu increased (p < 0.01) in pigs fed organic Cu sources compared with that in pigs fedCuSO4. The addition of CuHMB increased (p < 0.01) serum phosphorus and sulfur concentrations;however, there were no effects of source and level on jejunal morphology and serumbiochemical profile. These results suggest that the inclusion (50 mg/kg) of organic Cu sources(CuAA and CuHMB) in the growing pig diet could be beneficial for growth performanceand Cu availability and may reduce environmental pollution.