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이윤환,김영회,김근수,김삼곤 한국농화학회 2001 Applied Biological Chemistry (Appl Biol Chem) Vol.44 No.4
Two commercial wood vinegar liquors prepared from Cryptomeria japonica and Quercus sp., which are used as a mineral fertilizer in Korea, were extracted using dichloromethane as a solvent, respectively. The extracts were separated into acidic, phenolic, neutral and basic fraction by acid or alkali treatment, and the compositions of each fraction were analyzed by means of GC and GC-MS. A total of 103 compounds including 26 acids, 32 phenols and 45 neutral compounds were identified. The major components were acetic, propionic and n-butyric acid, representing of 41∼58% of the acidic fraction, guaiacol, 4-methylguaiacol and phenol, repersenting of 53.2∼63.9% of the phenolic fraction, and furfural, 3-methyl-2-cyclopenten-2-one, 2,3-dimethyl-2-cyclopenten-1-one and 5-methyl-2-furfural in the neutral fraction. In addition to these compounds, phenolic fraction in dichloromathane extract from wood vinegar liquor of C. japonica included large amounts of vanillin, acetovanillone and tentatively identified ethylvanillyl ether while that of Quercus sp. included some amounts of syringol and 4-methylsyringol.
이윤환,한상욱 대한전기학회 2019 전기학회논문지 P Vol.68 No.2
In this paper, proposed a method for tripping generators to ensure transient stability for the power system. For this purpose, method of grouping important generators through the analysis of the generator phase angles was applied. In addition, the kinetic energy and the rate of change of active power of the critical generator group were examined. On the basis of this, a methodology was adopted to stabilize the system by selecting tripping generators. By applying the proposed method might be improving the transient stability based on the efficient generator tripping scheme, and to reduce the tripped capacity and the number of tripping generators compared to the existing Special Protection Scheme. A case study has conducted the validity of the proposed method is demonstrated for a practical system. The simulations were conducted using real Korean power systems data.
화재모델 CFAST를 이용한 원전 화재구역의 CCDP 평가
이윤환,양준언,노삼규,김종훈 한국화재소방학회 2004 한국화재소방학회논문지 Vol.18 No.4
본 논문에서는 NIST에서 개발한 CFAST 화재 모델링 코드를 사용하여 원자력발전소 펌프실 화재를 모 의하였다. 급기 제한, 최소 산소 농도(Lower Oxygen Limit), 복사열 방출비율(Radiative Fraction), 방화 문 개방 정도 등의 CFAST 입력 변수 변화에 따라 화재 성장 변화를 분석하였다. 분석 결과에 의하면 본 화재구역에서의 화재는 환기 지배형 화재이므로 급기 제한 및 최소 산소 농도 10%로 설정하는 것이 타당한 것으로 판단되며, 복사열 방출에 따라 상부층 가스 온도는 큰 변화가 없는 것을 알 수 있었다. 화재가 발생한 화재구역 내 펌프를 제외하고는 상부에 위치한 케이블은 모두 건전성을 유지하는 것으로 나타났으며, CCDP(Conditional CDP)를 평가한 결과 9.25E-07로, 화재위험도분석보다 현실적이고 불확실 성이 감소한 결과를 도출할 수 있었다. This paper describes the result of the pump room fire analysis of the nuclear power plant using CFAST fire modeling code developed by NIST. The sensitivity studies are performed over the input parameters of CFAST: the constrained or unconstrained fire, Lower Oxygen Limit (LOL), Radiative Fraction (RF), and the opening ratio of the fire doors. According to the results, a pump room fire is the ventilation-controlled fire, so it is adequate that the value of LOL is 10% which is also the default value. It is anlayzed that the Radiative Fraction does not affect the temperature of the upper gas layer. It is appeared that the integrity of the cable located at the upper layer is maintained except for the safety pump at the fire area and the Conditional Core Damage Probability (CCDP) is 9.25E-07. It seems that CCDP result is more realistic and less uncertain than that of Fire Hazard Analysis (FHA).