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중공 및 중실에 따른 철근콘크리트 부재의 비틀림 최대내력평가
김민원 ( Kim¸ Min-won ),김준구 ( Kim¸ Jun-gu ),이가영 ( Lee¸ Ga-yeong ),김형국 ( Kim¸ Hyeong-gook ),김길희 ( Kim¸ Kil-hee ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.2
이 연구에서는 최근 늘어나는 중공 단면 부재의 비틀림을 평가하기 위하여 중공(Hollow) 및 중실(Solid)을 변수로 RC 부재에 대한 비틀림 최대 내력(T<sub>n</sub>)과 에너지 소산 능력을 비교하였다. 비틀림 최대 내력은 중실 실험체가 중공 실험체보다 약 4.5% 높게 나타났으며, 에너지 소산 능력은 중실 실험체가 중공 실험체보다 약 3% 높게 나타났다. 이를 통해 중공형태의 부재는 비틀림 최대 내력과 에너지 소산 능력에 대한 영향이 미미한 것을 확인하였다.
Design of a back-to-back converter to simulate transient state of renewable sources
김남원(Namwon Kim),김상용(Sang-Yong Kim),이효근(Hyo-Guen Lee),황철상(Chulsang Hwang),김경훈(Gyeong-Hun Kim),서효룡(Hyo-Ryong Seo),박민원(Minwon Park),유인근(In-Keun Yu) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
This paper describes a design of grid-simulator for experiment of transient stability of grid-connected renewable energy system. A transient analysis of renewable energy system has been researched by a simulation, because direct connection of renewable energy system and real utility is dangerous and it is hard to produce the transient grid condition. If a grid-simulator is used in the transient stability experiment, the transient grid condition might be generated easily with reference data and there is no impact on the grid. The grid-simulator composed of a back-to-back converter was designed and simulated with PSCAD/EMTDC to verify its operational characteristics.
김상용(Sang-Yong Kim),김남원(Namwon Kim),황철상(Chulsang Hwang),이효근(Hyo-Guen Lee),김경훈(Gyeong-Hun Kim),서효룡(Hyo-Ryong Seo),박민원(Minwon Park),유인근(In-Keun Yu) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Converter per photovoltaic module (CPM) system has been researched to increase the efficiency of photovoltaic (PV) power generation system. The stability and efficiency of PV system might be different according to the connection structure of CPMs. Differences between series and parallel connection of CPMs for PV power generation system were analyzed in this paper. Boost type CPM was used to control maximum power of each PV module. CPMs were connected in series, and parallel to compare the PV output power according to the converter connection. More effective connection of CPMs is proposed by the simulation considering abnormal operation of converter of the PV system.
원저 : 삼백초 ethanol 추출물의 RAW 264.7세포 내 살모넬라균 감염에 대한 항균 효과
이진주 ( Jin Ju Lee ),김동혁 ( Dong Hyeok Kim ),임정주 ( Jeong Ju Lim ),김대근 ( Dae Geun Kim ),김곤섭 ( Gon Sub Kim ),민원기 ( Won Gi Min ),이후장 ( Hu Jang Lee ),장홍희 ( Hong Hee Chang ),김석 ( Suk Kim ) 한국수의공중보건학회 2010 예방수의학회지 Vol.34 No.4
Salmonellosis is the commonest zoonosis worldwide that generally causes enterocolitis and foodborne poisoning which represents a considerable public health burden. Salmonella spp. are potential enteric pathogens and intracellularly replicates in host cells resulting in chronic infections. The medical treatments for salmonellosis have been difficult yet and had a serious problem including the increasing emergence of antibiotic resistance. The present report was designated to investigate the antibacterial effects of Saururus chinensis Baill ethanol extract (SCEE) on pure culture and infection with Salmonella enterica serovar Typhimurium (S. typhimurium) in murine derived macrophage RAW 264.7 cells. In determination of antibacterial activity of SCEE against S. typhimurium, bacterial viability was markedly decreased compared to the control. Also, SCEE significantly induced morphological change (p<0.05) of RAW 264.7 cells. In infection assay of S. typhimurium in RAW 264.7 cells pretreated with 100㎍/㎖of SCEE, which is a non-cytotoxic concentration, bacterial uptake ability of macrophage was increased corresponding with morphological change, whereas bacterial survival rates within macrophage were markedly reduced compared with untreated control. Furthermore, nitric oxide (NO) production in SCEE-treated cells was slightly increased until 2 h but showed a tendency of decrease after 4 h until 24 h post infection compared with untreated control with S. typhimurium infection. Taken together, these findings demonstrated that SCEE has the antibacterial activity for S. typhimurium and the protective effects against S. typhimurium infection through activating murine macrophage independent on NO, suggesting that SCEE may be beneficial on the disease caused by intracellularly replicating pathogens as a safe alternatives of conventional chemotherapies.