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양성 돌발성 두위 현훈에 대한 반하백출천마탕(半夏白朮天麻湯)의 효과 : 체계적 문헌고찰 - CNKI 검색을 중심으로
권기현,오서혜,박은수,김미현,홍승효,송금주,박은영,Gwon, Gi-hyeon,Oh, Seo-hye,Park, Eun-soo,Kim, Mi-hyeon,Hong, Seung-hyo,Song, Geum-ju,Park, Eun-young 대한한방내과학회 2021 大韓韓方內科學會誌 Vol.42 No.4
Objectives: This study examines the effect of Banhabaekchulcheonma-tang on Benign Paroxysmal Positional Vertigo (BPPV) through a systematic review of randomized controlled trials (RCTs) in the Chinese National Knowledge Infrastructure Database (CNKI). Methods: RCTs were included that tested the effect of Banhabaekchulcheonma-tang on BPPV. A study of the literature in the CNKI was performed for papers published from January 1, 2011 to June 30, 2021. Results: A total of eight RCTs met the inclusion criteria. All studies identified the effect of Banhabaekchulcheonma-tang in the treatment of BPPV. The effectiveness of treatment was higher in the intervention group than in the control group, as shown through evaluation indicators, including the total effective rate, dizziness handicap inventory (DHI), and blood lipids. Conclusion: Treatment with Banhabaakchulcheonma-tang was found to be effective in treating BPPV. However, due to the low quality of available studies, the significance of this conclusion is somewhat limited. Further clinical studies are needed on the development of diagnosis and treatment methods for BPPV based on Korean medicine.
권기현,이종훈,유위도,Gwon, Gi-Hyeon,Lee, Jong-Hun,Yu, Wi-Do 한국기계연구원 2004 硏究論文集 Vol.34 No.-
In this study, effect of temperature and time on melt-out of 25wt% Al-alloyed ductile iron has been investigated. The oxidation tests were carried out in a tube furnace at $800^\circC$, $930^\circC$, and $1000^\circC$ for lh, 5h, 10h, 50h. The microstructure, microhardness, and $Al_2O_3$ layer of oxidation-treated 25wt% Al-alloyed ductile iron samples (10 x 10 x 10 mm) were investigated. Phase identification was performed by X-ray diffraction(XRD) and EDS. The oxidation-treated 25wt% Al-alloyed ductile iron samples at $930^\circC$ for lh, 5h, 10h and KS GCD 500 were used for melt-out test in an Al alloy melt. The melt-out test results showed that oxidation tested sample at $930^\circC$ for 5h which on the whole forms $2-3\mum$ $Al_2O_3$ layer showed lowest melt-out depth. It was observed showed that appropriate Al203 layer can affect melt-out behaviors.
권기현(Gi-Hyeon Gwon),한준(Joon Han),오윤식(Yun-Sik Oh),김응상(Eung-Sang Kim),김철환(Chul-Hwan Kim) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.6
At the end of the 19th century, a battle known as the War of the Currents was fought over how electricity would be generated, delivered, and utilized. In this day and age, there has been a growing interest in Green Growth policies as countermeasures against global warming. As a result of these policies, the use of new and renewable energy needed a power converter to replace fossil fuels has expanded. To reduce power consumption through high efficiency of conversion, Low Voltage DC (LVDC) distribution systems are suggested as an alternative. In a DC distribution system, DC loads are very efficient due to decrease the stages of power conversion. If the LVDC distribution system is adopted, not only DC load but also existing AC loads should be connected with LVDC system. Thus, the modeling of two loads is needed to analyze the DC distribution system. This paper, especially, is focused on the modeling of resistive load and electronic load including power electronic converters using ElectroMagnetic Transient Program (EMTP) software.
송전계통 과도 안정도 향상을 위한 최적 순차 재폐로에 관한 연구
권기현(Gi-Hyeon Gwon),오윤식(Yun-Sik Oh),박지경(Ji-Kyung Park),조규정(Kyu-Jung Jo),손승현(Seung-Hyun Sohn),김철환(Chul-Hwan Kim) 대한전기학회 2013 전기학회논문지 Vol.62 No.10
In transmission system, reclosing scheme is very useful method to improve continuity of power supply and reliability of system. Especially, high speed reclosing which is used generally in transmission systems has a benefit improving transient stability. However, the reclosing can jeopardize the stability under the condition having high difference of voltage phase angle between both ends. Thus, this paper proposes optimal sequential reclosing scheme to improve transient stability due to reclosing operation. The optimal sequential reclosing is that each phase is closed sequentially considering transient energy. In this paper, 345kV and 154kV transmission system is modeled using EMTP (ElectroMagnetic Transient Program) to verify the performance and effectiveness of optimal sequential reclosing on transient stability. Also, Integral Square Error(ISE) method is used to assess the transient stability.