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( Chaiwat Monmai ),( Seok Hyeon Go ),( Il-shik Shin ),( Sangguan You ),( Hyungjae Lee ),( Seokbeom Kang ),( Woo Jung Park ) 한국미생물생명공학회(구 한국산업미생물학회) 2018 Journal of microbiology and biotechnology Vol.28 No.3
Asterias amurensis is a marine organism that causes damage to the fishing industry worldwide; however, it has been considered a promising source of functional components. The present study aimed to investigate the immune-enhancing effects of fatty acids from three organs of A. amurensis on murine macrophages (RAW 264.7 cells). A. amurensis fatty acids boosted production of immune-associated factors such as nitric oxide (NO) and prostaglandin E2 in RAW 264.7 cells. A. amurensis fatty acids also enhanced the expression of critical immuneassociated genes, including iNOS, TNF-α, IL-1β, and IL-6, as well as COX-2. Western blotting showed that A. amurensis fatty acids stimulated the NF-κB and MAPK pathways by phosphorylation of NF-κB p-65, p38, ERK1/2, and JNK. A. amurensis fatty acids from different tissues resulted in different levels of NF-κB and MAPK phosphorylation in RAW 264.7 cells. The results increase our understanding of how A. amurensis fatty acids boost immunity in a physiological system, as a potential functional material.
Simulation and Analysis of Existing MPPT Control Methods in a PV Generation System
Go, Seok-Il,Ahn, Seon-Ju,Choi, Joon-Ho,Jung, Won-Wook,Yun, Sang-Yun,Song, Il-Keun The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.4
Maximum Power Point Tracking (MPPPT) techniques are employed in PV systems to make full utilization of PV array output power which depends on solar irradiation and temperature. Recently, many MPPT algorithms and control schemes of PV system have been proposed, but different control methods and different PID controller parameters lead to different output efficiency and dynamic response. Therefore, in this paper, a PSCAD/EMTDC user defined module of the solar array is established to easily simulate its inherent characteristics with the basic specification data. Moreover, we also compare the advantages and weakness of the existing MPPT control methods by simulations to give a reference to the Grid-Connected Photovoltaic System (GCPS) designers.
배전관제센터의 운전영역 구분을 위한 정량적 업무량 분석
고석일(Seok-Il Go),서동권(Dong-Kwen Seo),최준호(Seo?Joon-Ho Choi),안선주(Seon-Ju Ahn),김현우(Hyun-Woo Kim),윤상윤(Sang-Yun Yun) 대한전기학회 2018 전기학회논문지 P Vol.67 No.4
In recent, KEPCO (Korea Electric Power Corporation) faced difficulties of the DCC (distribution control center) due to the increase of field equipment and operational cost, and aging of operating staffs. In response to these changes in the DCC, KEPCO is trying to change the organization and system of the DCC. In this paper, we present a new attempt to change organization and structure of distribution control center, which was implemented by KEPCO recently. This paper is divided into three major parts. First, to examine the adequacy of the divided basis of current DCCs based on the quantity of installed electrical equipment, we analyzed the correlation between the operational history of the DCCs and the number of equipment. Through the analysis, we confirmed that there is little relationship between the number of equipment and actual workload. Second, we conducted visits and questionnaire surveys of all the DCCs to identify factors affecting the actual workload of distribution operators and then summarized the results. Third, based on this survey, a general formula for analyzing the workload of a DCC was derived, and each DCC’s average annual total workload, day/night workload, and required number of personnel were calculated. Through this study, we proposed a more realistic management method of DCCs that can overcome the division criteria based on equipment quantity.
고석일(Seok-Il Go),최준호(Joon-Ho Choi),정원욱(Won-Wook Jung),송일근(Il-keun Song) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
본 논문에서는 배전제통의 전압을 적정 수준으로 유지하며 무효전력의 변화를 통한 배전 손실을 최소화하기 위한 분산전원연계에 따른 배전손실을 고려해 본다. 적정 전압을 유지하기 위해서 ULTC방식을 이용하였다. 손실평가함수와 전압평가계수를 도입하여 배전손실을 최소화하도록 하였다. 모의 배전 계통을 정의하여 사례별로 분산전원 계통을 해석을 통해 분산전원의 무효전력 제어를 통해 계통손실을 최소화 하도록 하였다.