• Title/Summary/Keyword: Min Je-In

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A Snubber Circuit for Flying Capacitor Multilevel Inverter and Converter (플라잉 커패시터 멀티레벨 인버터 및 컨버터를 위한 스너버 회로)

  • Lee, Min-Su;Seong, Hyeon-Je;Kim, In-Dong;No, Ui-Cheol;Jo, Cheol-Je
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.50 no.9
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    • pp.459-466
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    • 2001
  • This paper proposes a snubber circuit for flying capacitor multilevel inverter and converter. The proposed snubber circuit makes use of Undeland snubber as basic snubber unit. It has such an advantage of Undeland snubber used in the two-level inverter. Compared with conventional RCD/RLD snubber for multileve1 inverter and converter, the proposed snubber keeps such good features as fewer number of components, reduction of voltage stress of main switching devices due to low overvoltage, and improved efficiency of system due to low loss snubber. In this paper, the proposed snubber is applied to three-level flying capacitor inverter and this feature is demonstrated by computer simulation and experimental result.

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Studies on the Morphology and the Chemotaxonomy of Citrus Plants Native to Je Ju Island and on its Application (II) -On the Chemical Components of Citrus platymamma Hort. ex Tanaka- (제주도 재래감귤의 식물학적 특성과 이용에 관한 연구 (II) -병귤(甁橘)의 성분연구-)

  • Kim, Chang-Min;Huh, In-Ok;Han, Dae-Suk
    • Korean Journal of Pharmacognosy
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    • v.10 no.2
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    • pp.85-87
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    • 1979
  • 제주도(濟州道) 재래감귤인 병귤(甁橘) Citrus platymamma $H_{ORT}$. ex $T_{ANAKA}$의 엽(葉), 과피(果皮), 수피(樹皮)의 클로로포롬 가용부(可容部)에서 무색침장정(無色針狀晶), $C_{10}H_{10}O_{4}$, mp $139{\sim}140^{\circ}c$을 단리(單利)하고 이화학적(理化學的) 성상(性狀)및 UV, IR, NMR, Mass spectra를 이용하여 그 화학구조(化學構造)를 구명(究明)한바 1,4-benzenedicar-boxylic acid dimethyl ester이었다. 또 과피(果皮)의 수용부(水溶部)에서 단리(單利)한 2개의 flavonoid 배당체(配糖體)는 그 이화학적(理化學的)인 성상(性狀) 및 IR-spectrum으로 보아 naringin hesperidin이었다.

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Effect of Oral Sport Beverages with Medicinal Herbs Added on Short-term Recovery from Exercise-induced Fatigue (한의약소재 스포츠음료수 섭취가 운동-유발성 피로의 단시간 회복에 미치는 영향)

  • Na Hyun-Jong;Lee Kyu-Lark;Kang Ho-Youl
    • The Journal of Korean Medicine
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    • v.27 no.1 s.65
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    • pp.36-46
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    • 2006
  • Objectives : Ginseng Research Group in Korea Food Research Institute developed Saeng Mac San (KFRI-2)and Je Ho Tang (KFRI-3) with their sensory factors more acceptable. And we examined their effects on the short-term recovery capacity for cycling exercise (EX) maintained to all-out. Methods : Seven healthy young subjects (aged $24.0{\pm}2.1yr$) were volunteered at this double blind test. Each of KFRI-2, 3, a commercial sport beverage and control (CON) was offered randomly on a series of EX protocol including 65% VO2max-90min EX (D-ride). 1h-recovery and 85% VO2max EX to all-out (P-ride) under the control of their heart rate (HR) and rating perception of exertion (RPE). Blood samples were collected before D-ride, 30, 60 and 90min in D-ride, 30 and 60min in the recovery period and each 10min in P-ride. Plasma analysis items were glucose, insulin, cortisol (CORT), testosterone (TEST), free fatty acid (FFA), $Na^+$, Cl-and $K^+$. The collected data (Means${\pm}$SE) were analysed by two-way ANOVA and statistically significant differences between treatments (p<0.05) by LSD.; the significant level in FFA, $Na^+$, Cl-and $Na^+$ was p<0.01 Results : At 30min during recovery. plasma glucose level in KFRI-3 was significantly higher than CON, and also insulin in KFRI-3 was than CON and KFRI-2. FFA in KFRI-3 was significantly lower than CON during recovery. $Na^+$ in KFRI-3 significantly higher than CON at 90min in D-ride, and also KFRI-2 was at 60min during recovery. However CORT, TEST, Cl-and $Na^+$ in treated beverages were not significant. KFRI-2, 3 elevated the time for P-ride more than CON did. Conclusions : KFRI-2, 3 elevated the time for P-ride about 12% more than CON did. It is based on rapid recovery of plasma glucose level and inhibition of lipolysis during recovery.

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Exosomes Secreted by Toxoplasma gondii-Infected L6 Cells: Their Effects on Host Cell Proliferation and Cell Cycle Changes

  • Kim, Min Jae;Jung, Bong-Kwang;Cho, Jaeeun;Song, Hyemi;Pyo, Kyung-Ho;Lee, Ji Min;Kim, Min-Kyung;Chai, Jong-Yil
    • Parasites, Hosts and Diseases
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    • v.54 no.2
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    • pp.147-154
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    • 2016
  • Toxoplasma gondii infection induces alteration of the host cell cycle and cell proliferation. These changes are not only seen in directly invaded host cells but also in neighboring cells. We tried to identify whether this alteration can be mediated by exosomes secreted by T. gondii-infected host cells. L6 cells, a rat myoblast cell line, and RH strain of T. gondii were selected for this study. L6 cells were infected with or without T. gondii to isolate exosomes. The cellular growth patterns were identified by cell counting with trypan blue under confocal microscopy, and cell cycle changes were investigated by flow cytometry. L6 cells infected with T. gondii showed decreased proliferation compared to uninfected L6 cells and revealed a tendency to stay at S or G2/M cell phase. The treatment of exosomes isolated from T. gondii-infected cells showed attenuation of cell proliferation and slight enhancement of S phase in L6 cells. The cell cycle alteration was not as obvious as reduction of the cell proliferation by the exosome treatment. These changes were transient and disappeared at 48 hr after the exosome treatment. Microarray analysis and web-based tools indicated that various exosomal miRNAs were crucial for the regulation of target genes related to cell proliferation. Collectively, our study demonstrated that the exosomes originating from T. gondii could change the host cell proliferation and alter the host cell cycle.

Revers phase HPLC Separation of D-Amygdalin and Neoamygdalin and Optimum Conditions for Inhibition of Racemization of Amygdalin

  • Hwang, Eun-Young;Kim, Dong-Min;Koh, Jung-A;Lee, Sang-Soo;Lee, Je-Hyun;Lee, Yong-Moon;Hong, Seon-Pyo
    • Proceedings of the PSK Conference
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    • 2002.10a
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    • pp.253.3-254
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    • 2002
  • In boiling aqueous solution, D-amygdalin usually begins to convert into neoamygdalin in 3 min and more than 30% of the initial D-amygdalin is found as neoamygdalin after 30 min. In this report, we establish methods for simple HPLC analysis and the inhibition of D-amygdalin conversion. D-Amygdalin and its conversion product, neoamygdalin, were clearly separated on reverse-phase column chromatography by an optimized eluent of 10mM sodium phosphate buffer (pH 3.8) containing 6% acetonitrile. (omitted)

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Comparison of Selective and Non-Selective Dry Etching of GaAs/AlGaAs and GaAs/InGaP using Planar Inductively Coupled Plasmas (평판형 유도결합 플라즈마를 이용한 GaAs/AlGaAs 및 GaAs/InGaP 의 선택적 및 비선택적 건식식각의 비교)

  • Park, Min-Yeong;Choe, Chung-Gi;Ryu, Hyeon-U;No, Ho-Seop;Mun, Jun-Hui;Yu, Seung-Yeol;Im, Wan-Tae;Lee, Je-Won;Jo, Gwan-Sik;Jeon, Min-Hyeon;Song, Han-Jeong;Baek, In-Gyu;Gwon, Min-Cheol;Park, Geon-Su;Yun, Jin-Seong
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2005.05a
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    • pp.73-73
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    • 2005
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A Collaborative Study on Korean Standard JE Vaccine for Potency Assay

  • Kim, Jae-Ok;Shin, Jin-Ho;Baek, Sun-Young;Min, Kyung-Il;Min, Bok-Soon;Ryu, Seung-Rel;Kim, Byoung-Guk;Kim, Do-Keun;Ahn, Mi-Jin;Park, Mi-Kyung;Song, Hye-Won;Lee, Chung-Keel;Lee, Seok-Ho;Park, Sue-Nie
    • Journal of Microbiology and Biotechnology
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    • v.14 no.4
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    • pp.745-750
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    • 2004
  • The objective of this collaborative study was to establish a Korean standard of Japanese encephalitis (JE) vaccine (mouse brain-derived, formalin-inactivated) for potency assay. A candidate preparation proposed as a Korean standard was provided by GreenCross Vaccine, and six laboratories, including one national control laboratory and five manufacturers of JE vaccine, participated in the study. The potency of the candidate preparation and a reference standard obtained from Japan was estimated by mouse immunogenicity assay using the in vitro plaque reduction neutralization test (PRNT). The results of 72 assays conducted by the 6 laboratories showed that the overall mean potency estimate of the candidate preparation was 2.455 log median plaque reduction neutralization antibody titer per 0.5-ml dosage administered twice in mice at 7-day intervals, and that the mean potency ratio of the candidate preparation relative to the reference standard was 1.074. The potency estimates were quite variable among laboratories irrespective of the preparation. The variability of assays assessed by Z scores and coefficient of variation (CV) were in general within the level of acceptance (Z scores within $\pm3$ and $CV\;\leq\;15%$). Therefore, we concluded that the candidate preparation would be suitable as a national standard for testing the potency of JE vaccine (inactivated).