• Title/Summary/Keyword: Yoon Jeung

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Estimation of potential area for red tide occurrence in the Korean coasts by Marine GIS

  • Yoon, Hong-Joo;Whang, Wha-Jeung
    • Proceedings of the KSRS Conference
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    • 2003.11a
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    • pp.876-878
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    • 2003
  • It was studied on the choice of potential area for red tide occurrence from oceanographic factors. Oceanographic factors of favorable marine environmental conditions for the red tide formation included warm water temperature, low salinity, high suspended solid, low phosphorus, low nitrogen. It was founded the potential areas for red tide occurrence in August 2000 by GIS conception: Yeosu~Dolsan coast, Gamak bay, Namhae coast, Marado coast, Goheung coast, Deukryang bay, respectively.

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A Case of Treatment of Livedo Vasculopathy (청피반성 혈관병증 치험 1례)

  • Han, Eun-Jeung;Kim, Chan-Jung;Hong, Seung-Ug;Kim, Yoon-Bum
    • The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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    • v.14 no.2
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    • pp.84-88
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    • 2001
  • Livedo vasculopathy clinically shows purpuric papules and recurrent ulcers in the lower extremities, mainly on the ankles, leaving characteristic scars called atrophie blanche after the healing of the ulcers. In Korean literture, about 10 cases of this disease have been reported but nothing in korean oriental medicine. So, we report a case of livedo vasculopathy in a 46 year-old female patient treated by oriental medicine therapy.

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Output Voltage Control of Isolated Bi-Directional DC-DC Converters using Sliding Mode Control (슬라이딩모드 제어를 이용한 절연형 양방향 DC-DC 컨버터의 출력 전압제어)

  • Jeung, Yoon-Cheul;Lee, Sang-Min;Lee, Dong-Choon
    • Proceedings of the KIPE Conference
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    • 2015.11a
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    • pp.91-92
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    • 2015
  • 본 논문에서는 DAB(Dual Active Bridge) 타입의 절연형 양방향 DC/DC 컨버터의 출력전압 제어기법을 제시한다. SPS(Single-phase shift) PWM 기반의 고조파 모델에 대해 슬라이딩 모드 제어기(SMC)를 설계한다. 제시된 기법은 시뮬레이션 결과에 의해 성능이 검증된다.

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Variable-Gain Droop Control for Parallel Operation of Generation Systems in DC Electric Ships (직류 전기선박 발전시스템 병렬운전을 위한 가변이득 드룹 제어 기법)

  • Jeung, Yoon-Cheul;Lee, Dong-Choon
    • Proceedings of the KIPE Conference
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    • 2016.11a
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    • pp.184-185
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    • 2016
  • 본 논문에서는 직류 전기 선박의 발전시스템의 병렬 운전시 순환전류 저감 및 직류 전압유지에 효과적인 가변이득 드룹 제어 기법을 제시한다. PSIM을 이용한 시뮬레이션 결과를 보인다.

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Control Scheme for Suppressing Bus-Voltage Oscillations in DC Microgrids (직류 마이크로그리드의 버스 전압 진동 억제를 위한 제어 기법)

  • Jeung, Yoon-Cheul;Jung, Choul-Woo;Lee, Dong-Choon
    • Proceedings of the KIPE Conference
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    • 2019.07a
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    • pp.107-109
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    • 2019
  • 본 논문에서는 직류 마이크로그리드의 버스 전압 진동을 감쇠하기 위한 에너지 저장장치의 제어기법을 제시한다. IDA-PBC 이론을 이용한 제어기를 설계하고, 직류 마이크로그리드의 안정도를 해석한다. PSIM 시뮬레이션을 이용하여 제안하는 기법의 타당성을 검증하였다.

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A Case of the Oculomotor Nerve Palsy in Benedikt's Syndrome Patient (베네딕트 증후군 환자의 동안신경마비 치험 1례)

  • Kim, Seung-Jin;Jeung, Jong-An;Ann, Jeung-Jo;Jeon, Sang-Yoon;Hong, Seok;Kim, Kyung-Su;Jeung, Su-Mi
    • The Journal of Internal Korean Medicine
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    • v.26 no.3
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    • pp.670-676
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    • 2005
  • The purpose of this case study is to present a case of oculolmotor nerve palsy due to midbrain infarction improved by acupuncture and herb medicine. Oculomotor nerve palsy is a disorder associated with dysfunction in the third cranial nerve, which causes eye movement disorder, diplopia and ptosis. The patient, who was diagnosed with Benedikt's Syndrome(Red Nucleus Syndrome), was given oriental medical treatment. Benetikt's Syndrome has the various symptoms of weakness on one side(contralateral) and eye movement disorder, ptosis, diplopia(ipsilateral) etc., but research on Benetikt's Syndrome or midbrain infarction is scant. Results of this study suggest a role for conservative therapy with herb medicine and acupuncture to treat oculomotor nerve palsy(eye movement disorder, ptosis, diplopia, etc., ipsilateral) and right motor weakness(contralateral) due to midbrain infarction. Further research into oriental medical treatment for such disorders will be forthcoming.

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Study on Antihyperlipidemic Effect of Kamiondamtang (가미온담탕(加味溫膽湯)의 항고지혈 작용에 대한 연구)

  • Kim, Kyung-Soo;Jeun, Sang-Yoon;Ann, Jeung-Jo;Hong, Seok;Jeung, Su-Mi
    • Herbal Formula Science
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    • v.13 no.1
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    • pp.85-101
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    • 2005
  • Kamiondamtang(KODT) has been used in oriental medicine as stress by many medical practitioner for the study of KODT, we had fed mice divided to three groups(basal diet, hyperlipidemic diet, hyperlipidemic diet + KODT), and observed the change of weight, total cholesterol, triglyceride, SGOT, SGPT, HDL-cholesterol, LDL-cholesterol on the serum per every 7days for 6weeks. To help comparison with the results above, we had tested endothelial cells and liver. The results of this Study were obtained as fallows ; 1. Total cholesterol, triglyceride and LDL-cholesterol were decreased significantly by KODT. 2. HDL-cholesterol was increasd significantly by KODT. 3. SGOT was intended to decrease by KODT, 4. %W was decreased significantly by KODT. 5. In case of supplying KODT, WBC attatched on endothelial cells and vacuoles in muscular layer were not observed. 6. In case of supplying KODT, fatty degeneration was not observed in liver portal area.

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A study of area-ratio effect on self-ignition of high pressure hydrogen gas released in to a tube (면적비 변화에 따른 튜브 내 고압 수소 자발점화현상 연구)

  • Yoon, Hee;Lee, SangYoon;Jeong, Man Chul;Jeung, In-Seuck;Lee, Hyoung Jin
    • 한국연소학회:학술대회논문집
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    • 2015.12a
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    • pp.147-150
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    • 2015
  • When high-pressure gas is suddenly leaked out into the air, unexpected ignition occurs without any external ignition source. Until now, there have been investigations on self-ignition of hydrogen by supplying high-pressure hydrogen gas into a tube. However the mechanism of hydrogen ignition is still unclear. This paper describes the area-ratio effect on hydrogen ignition by inserting a brass plate. The results show that the ignition phenomena differ as the area-ratio changed. Also, the rupture pressure for self-ignition has to be higher.

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Antioxidant and Cholinesterase Inhibitory Activities of Aqueous Extract from Rainbow Trout Oncorhynchus mykiss

  • Baek, Jae-Min;Yoon, Na-Young;Kim, Yeon-Kye;Lee, Doo-Seog;Yoon, Ho-Dong;Park, Jeung-Sook
    • Fisheries and Aquatic Sciences
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    • v.14 no.2
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    • pp.89-92
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    • 2011
  • We investigated the antioxidant and cholinesterase inhibitory activities of the aqueous extract of rainbow trout Oncorhynchus mykiss. The antioxidant activity of O. mykiss aqueous extract was determined by in vitro peroxynitrite scavenging activity and reducing power assays. The aqueous extract of O. mykiss showed potent peroxynitrite radical scavenging activity ($IC_{50}=0.12{\pm}0.001\;mg/mL$) and reducing power (absorbance=$0.47{\pm}0.001$) at the concentration of 1 mg/mL. The in vitro cholinesterase inhibitory activity of O. mykiss aqueous extract was examined using spectrophotometric analyses of acetyl- and butyrylcholinesterase. The aqueous extract of O. mykiss showed acetylcholinesterase inhibitory activity ($IC_{50}=1.61{\pm}0.13\;mg/mL$), but did not exhibit inhibitory activity against butyrylcholinesterase. These results suggest that O. mykiss possesses antioxidant and acetylcholinesterase inhibitory activities and provide scientific evidence for the health benefits of O. mykiss aqueous extract.