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최우영,박민하,정창훈,김용표,이지이,Choi, Woo Yeong,Park, Min Ha,Jung, Chang Hoon,Kim, Yong Pyo,Lee, Ji Yi 한국입자에어로졸학회 2021 Particle and Aerosol Research Vol.17 No.3
Chungnam region accounts for the largest SO<sub>X</sub> (22.8%) emission with the second-largest NO<sub>X</sub> (10.8%) emission in Korea due to the integration of many large industrial sources including a steel mill, coal-fired power plants, and petrochemical complex. Air pollutants emitted by large industrial sources can cause harmful problems to humans and the environment. Thus, it is necessary to understand dispersion patterns of air pollutants from large industrial sources in Chungnam to characterize atmospheric contamination in Chungnam and the surrounding area. In this study, seasonal atmospheric dispersion characteristics for SO<sub>X</sub>, NO<sub>X</sub>, and PM2.5 from ten major point sources in Chungnam were evaluated using HYSPLIT 4 model, and their contributions to SO<sub>2</sub>, NO<sub>2</sub> concentrations in the regions near the source areas were estimated. The predictions of the HYSPLIT 4 model show a seasonal different dispersion pattern, in which air pollutants were dispersed toward the southeast in winter while, northeast in summer. In summer, due to weaker wind speed, air pollutants concentrations were higher than in winter, and they were dispersed to the metropolitan area. The local emissions of air pollutants in Taean area had a greater influence on the ambient SO<sub>2</sub> and NO<sub>2</sub> concentrations at Taean, whereas SO<sub>X</sub> and NO<sub>X</sub> emissions from large sources located at Seosan showed relatevely little effect on the ambient ambient SO<sub>2</sub> and NO<sub>2</sub> concentrations at Seosan.
국내 송전계통 연계기준 기반 신재생발전원의 주파수조정 성능 평가 및 정량화 방법
최우영(Woo Yeong Choi),조기룡(Gi Ryong Jo),이지훈(Ji Hoon Lee),국경수(Kyung Soo Kook) 대한전기학회 2020 전기학회논문지 Vol.69 No.12
As the connection of renewable energy sources (RES) increases according to its expansion plan, the system operator has to be more cautious to manage the frequency stability in the power system. For doing that, many power grid utilities have announced the Grid code for the connection of RES with specific control performance such as the frequency response. However, the power system operators have to struggle in effectively considering the frequency response of RES in managing the operating reserve for controlling the frequency since there is no method for qualitatively evaluating the frequency response from RES. Therefore, this paper proposes the method for evaluating and quantifying the frequency response from RES considering the grid connection code in the Korean power system.
A549 인체폐암세포의 증식에 미치는 신령버섯 추출물의 영향에 관한 연구
최우영(Woo Young Choi),박철(Cheol Park),이재윤(Jae-Yun Lee),김기영(Gi-Young Kim),박영민(Yeong Min Park),정영기(Yong-Kee Jeong),이원호(Won Ho Lee),최영현(Yung Hyun Choi) 한국식품영양과학회 2004 한국식품영양과학회지 Vol.33 No.8
브라질 기원인 신령버섯(A. blazei murill)은 강력한 항암 및 면역강화 작용을 가진 것으로 알려져 있다. 본 연구에서는 신령버섯 수용성 추출물(water extracted A. blazei Murill, WEAB)이 A549 인체 폐암세포 증식에 미치는 영향을 조사하였으며, 증식억제와 연관된 기전 해석을 시도하였다. WEAB가 처리된 A549 세포는 처리 농도 의존적으로 생존율이 감소되었으며, WEAB 처리는 암세포의 다양한 형태적 변형을 유발하였다. Flow cytometry 분석 결과로서 WEAB 처리에 의한 A549 폐암세포의 증식억제는 세포주기 G2/M arrest 및 apoptosis 유발과 직접적으로 연관성이 있음을 알 수 있었다. WEAB가 처리된 암세포에서 전사 및 번역 수준에서 cyclin A 발현의 감소 및 Cdk inhibitor p21 발현의 증가 현상이 관찰되었으나, cyclin B1, Cdk2, Cdc2, Wee1, Cdc25C 및 p53 등의 발현에는 큰 변화가 관찰되지 못하였다. 또한 WEAB의 처리는 COX-2 선택적 발현 저하를 유발하였으나, telomere 조절 관련 유전자들의 발현에는 큰 영향을 주지 못하였다. 이상의 결과는 신령버섯 추출물이 강력한 항암 및 암예방 효능의 잠재력을 가지고 있음을 의미하며, 이에 관한 지속적인 연구가 필요할 것으로 생각된다. Agaricus blazei Murill is a medicinal mushroom native to Brazil. It used to be a source of antitumor and immunoactive compounds and considered a health food in many countries. In the present study, it was examined the effects of water extract of A. blazei (WEAB) on the growth of human lung carcinoma cell line A549 in order to investigate the anti-proliferative mechanism by WEAB. Treatment of A549 cells to WEAB resulted in the growth inhibition, morphological change and induction of apoptotic cell death in a dose-dependent manner as measured by MTT assay and flow cytometric analysis. Flow cytometric analysis revealed that WEAB caused G2/M phase arrest of the cell cycle, which was associated with a down-regulation of cyclin A in both transcriptional and translational levels. WEAB treatment induced a marked up-regulation of cyclin-dependent kinase (Cdk) inhibitor p21, however, the levels of Cdk2, Cdc2, Wee1, Cdc25C and p53 expression were remained unchanged in WEAB treated cells. In addition, WEAB treatment inhibited the levels of cyclooxygenase (COX)-2 mRNA and protein without alteration of COX-1 expression. Taken together, these findings suggest that WEAB may be a potential chemotherapeutic agent for the control of human lung carcinorma cells and further studies will be needed to identify the active compounds that confer the anti-cancer activity of WEAB. Once such compounds are identified, the mechanisms by which they exert their effects can begin to be characterized.
배터리 가용성 극대화를 고려한 BESS의 AGC 주파수제어 추종운영방안
최우영(Woo Yeong Choi),유가람(Ga Ram Yu),국경수(Kyung Soo Kook) 대한전기학회 2016 전기학회논문지 Vol.65 No.7
Battery energy storage system(BESS) attract the attention of the power system operators with its fast response to a disturbance in spite of its limited energy capacity. This paper proposes the operating method of BESS for following the Automatic Generation Control(AGC) frequency control which is centrally distributed by a system operator. As BESS needs to just meet the control requirement from the system operator, it should be able to properly manage the state of charge(SOC) of BESS to be available to control signal. For doing these, the proposed method distributes the control requirement to available batteries in proportion to its SOC. In addition, unavailable batteries are controlled to recover the SOC to an appropriate range, and the recovering power is supplied by available batteries meeting the control requirement. Moreover, the proposed method manages the efficiency of power conversion system (PCS) by limiting the number of PCS to be assigned for the low control requirement. Finally, the case studies are carried out to verify the effectiveness of proposed strategy.