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김승애(Seung-Ae Kim),박병우(Byoung-Woo Park),허민호(Min-Ho Heo),이상훈(Sang-Hun Lee),김광헌(Gwang-Heon Kim),박성준(Sung-Jun Park) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
본 논문에서는 상 절체와 같은 급작스러운 위상천위 발생시에도 위상추정에 의한 계통연계를 위한 고속 PLL 알고리즘을 제안하였다. 제안된 고속 PLL 알고리즘은 2상 정지좌표계에서 취득한 위상정보의 불안정성을 보상하기 위함으로 저주파 필터를 이용한 정지좌표계상의 위상정보를 feed-forward로 사용한 결과, 외란에 강인한 위상각을 추정하는 알고리즘을 구현 하였으며, PSIM을 이용한 시뮬레이션을 통하여 제안한 알고리즘의 타당성을 검증하였다.
김승애 ( Kim Seung-ae ) 대한영어영문학회 2012 영어영문학연구 Vol.38 No.2
Wordsworth and Chuang-tzu owed their great perception and great accomplishment to nature. Nature helped their mind to be jammed up with composure and vision, and enabled them to be outside conflicts and pains from their life. Wordsworth was able to get pleasure and comfort through his frequent visits to mountains and plains. Nature was a visionary power to him. And Chuang-tzu put his strong emphasis on a state of nature called “Mu-wei.’ He introduced ‘Zua-marng’ and ‘Sim-jae’ to explain his ‘tao.’ He persuaded us to empty all kinds of worldly desire and greed. ‘Zua-marng’ means ‘forgetting the work of mind,’ and ‘Sim-jae’ means ‘making our mind famished.’ Chuang-tzu emphasized that we could reach ‘tao’ by forgetting what we see and hear. This paper intended to study how Wordsworth and Chuang-tzu accomplished their state of tranquility and comfort through nature. Chuang-tzu tried to complete his ‘tao’ by ‘denying the work of our eye and ear, but Wordsworth tried to fill his mind with what his eyes and ears caught, which made it possible for both to catch an immortal pleasure from nature. They pursued a state of nature in the different way from each other’s, but they was able to enjoy, to our surprise, the same perception and accomplishment, transcending the conflicting reality of life. (Chonbuk National University)
양광훈(Kang-Hun Yang),김승애(Seung-ae Kim),이상혁(Sang-Hyeok Lee),김광헌(Kang-Heon Kim),박성준 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
Boost 컨버터는 전압을 상승시키는 기본적인 컨버터이다. 이 컨버터에서의 효율증대를 위한 병렬L과 이를 한발 더 나아가 병렬L을 변압기를 사용하여 자계로 빠져 나가는 부분의 손실을 줄이는 연구를 수행한다. 이를 위하여 스위칭에 따른 전류의 변화를 파악하며 Soft스위칭을 사용하여 병렬L과의 차이를 PSIM 시뮬레이션을 사용하여 확인하고, boost컨버터의 효율을 고찰한다.
산철쭉(Rhododendron yedoense var. poukhanense) 꽃으로부터 Terpenoid의 분리.동정
홍윤희,송명종,한재택,장태오,이윤형,김성훈,김승애,박미현,백남인,Hong, Yoon-Hee,Song, Myoung-Chong,Han, Jae-Taek,Jang, Tae-O,Lee, Youn-Hyung,Kim, Sung-Hoon,Kim, Seung-Ae,Park, Mi-Hyun,Baek, Nam-Ln 한국응용생명화학회 2003 한국농화학회지 Vol.46 No.2
산철쭉 끝을 MeOH로 추출하고, 이를 EtOAc, n-BuOH과 $H_2O$로 분배 추출하였다. EtOAc추출물과 n-BuOH 추출물에 대하여 silica gel과 ODS column을 이용하여 chromatography하거나, 아세틸화 한 후 sillica gel column chromatography를 수행하여 2종의 triterfenoid와 3종의 diterpenoio를 분리하였다. 각 화합물은 $^1H-^lH\;COSY$, HMQC, HMBC와 같은 2D-NMR기법을 포함한 스펙트럼 데이터를 해석하여 $2{\alpha}\;3\{beta}-dihydroxylolean-12-ene (1), ursolic acid (2), grayanotoxin IV (3), grayanotoxin I (4) 및 grayanotoxin III (5) 등으로 동정하였다. Extracts were obtained from the flower of Rhododendro yedoense var. poukhanense. (7 kg) in 80% aqueous MeOH and successively fractionated with solvent of EtOAc, n-BuOH and $H_2O$, successively. Silica gel and ODS column chromatographies of the EtOAc and n-BuOH fractions were repeatedly carried out by using the various solvent systems to give five terpenoids. Chemical structures of the isolated terpenoids were determined as $2{\alpha},3{\beta}-dihydroxylolean-12-ene$ (1), ursolic acid (2), grayanotoxin IV (3), grayanotoxin I (4) and grayanotoxin III (5) based on the interpretation of several spectral data including 2D-NMR such as $^1H-^1H\;COSY$, HMQC and HMBC.
Paeonol inhibits anaphylactic reaction by regulating histamine and TNE-α
Kim, Sung Hoon,Kim, Seung-Ae,Park, Mi-Kyung,Kim, Seung-Hyung,Park, Young-Doo,Na, Ho-Jeong,Kim, Hyung-Min,Shin, Min-Kyu,Ahn, Kyoo-Seok WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2004 東西醫學硏究所 論文集 Vol.2004 No.-
Paconol, a major phenolic component of Moutan Cortex, was known to have antiaggregatory, antioxidant and antiinflammatory activities. In the present study, we tried to elucidate thc effects of paconol on anaphylactic reaction and its mode of action. Paconol significantly inhibited histamine release from the rat peritoneal mast cells (RPMCs) treated with compound 48/80, a mast cell degranulator. The release of tumor necrosis factor (TNF)-α mast cell activating cytokine was significantly suppressed in RBL-2H3 mast cells pretreated with anti-dinitrophenyl (DNP) immunoglobulin E (lgE) in a dose-dependent manner. Paconol significantly inhibited lgE production in B cells activated by anti-CD40 mAb, recombinant interlcukin-4 (rIL-4) and recombinant histamine releasing factor (rHRF). Paconol effectively downregulated the expression of IL-4 in the activated B cells by reverse transcription polymerase chain reaction (RT- PCR). We also confirmed that paconol effectivcly inhibited anaphylactic shock in mice by 90% at a dose of 0.5 mg/mouse versus PBS treated control 2 h after the i.p. injection of compound 48/80. These results suggest that paconol has antianaphylatic activity by regulating histamine and TNF-α.