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한국(韓國)의 지역별(地域別) 토공가능일수(土工可能日數)에 관(關)한 조사연구(調査硏究)
안병기 ( Byung Ki Ahn ),민병섭 ( Byung Sup Min ),박승범 ( Seung Bum Park ) 한국농공학회 1971 韓國農工學會誌 : 전원과 자원 Vol.13 No.3
1. Being seen at the table (20), the number of days which monthy average air temperatures are three degrees of Celsius thermometer (3℃) or more, is the highest marks to be 365 days at Cheju, secondly, 334 days at Pusan, and, Ulsan, Pohang, Mokpo, Yosu and Ullung-Do which all are coastal region are all 306 days, besides, all north area of Taegu and Kwang ju have 275 days consquently, there are 90 days, differance between maximum and minimum. 2. Being seen at the table (22), freezing dates to be influenced upon earth works are obtained, if (1) item is subtracted from 365 days one year. 3. Being seen at the table(18), number of rainy days of which records are 1 millimeter and over to be influenced upon earth through works, days which monthly average air temperatures are 3℃ or more, is the maximum to be 100 days at Cheju and its minimum is 60 days at Taegu. Every other region show 70 days or so. But Ullung-Do is 90 days. 4. Being seen at the table (26), the numbers of annual earth works possibility days(4) are obtained, if the values (3) which number of rainy days more than 1 millimeter during the same period are multiplied by 1.27 (coefficient of hindrance to earth works) are subtracted from the number of days which monthly average air temperatures 3℃ or more [(1)-(3)=(4)]. 5. The number of annual earth works possibility days by regional groups is the maximum to be 242 days at Pusan, and Cheju are 239 days. Other regions are from 218 days to 181 days, namely, they are about 200 days.
차성극,안병기,Cha, Seong-Keuck,Ahn, Byung-Ki 한국전기화학회 2002 한국전기화학회지 Vol.5 No.1
Fullerene으로 수식된 PPy(Polypyrrole)전극 즉, graphite(Gr)/ppy, fullerene $(full^-)$항을 Gr/5mM PPy, 1mM $full^-,0.1M\;TBABF_4,\; CH_3CN/Pt$형의 전지로 전기화학 중합법으로 제작하였다. $(full^-)$의 생성속도는 기질전극 재료인 Pt/ppy, Pt, Gr 및 Au전극에 대해 각각 93.6, $7.0\times10^2,\;42.6$ 및 $1.3\times10^2cms^{-1}$였다. 수식되지 않은 Gr/ppy와 수식된 $Gr/ppy, full^-$ 전극에 대한 어드미턴스 값이 $1.7\times10^{-3}S$에서 $8.3\times10^{-3}S$로 5배나 증가하였으며, 전기 이중층의 용량은 $2.4\times10^{-5}\;F$에서 $4.2\times10^{-5}\;F$로 174배 증가하였다. The type of graphite(Gr)/ppy, fullerene$(full^-)$ electrode, ppy one modified with $(full^-)$, was prepared with the cell type of Gr/5mM ppy, 1mM $(full^-)$, 0.1M $TBABF_4$, CH3CN/Pt. The values of the ionic formation rate of the it at electrode materials such as Pt/ppy, Pt, Gr and Au were $93.6,\;7.0\times10^2,\;42.6\;and\;1.3\times10^2cms^{-1}$ respectively. The admittance values of the Grippy electrode and the modified Grippy, $(full^-)$ one were five times enhanced $1.7\times10^{-3}S\;to\;8.3\times10^{-3}\;S$ and capacitance values of electrical double layer of them were 174 times increased $2.4\times10^{-6}\;F\;to\;4.2\times10^{-5}\;F$ respectively.
장규진(Jang, Gyu-Jin),최영민(Choi, Young-Min),안병기(Ahn, Byung-Ki),임태원(Lim, Tae-Won) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
We have concentrated on the performance improvement of each part for durability, safety and cost of high pressure storage system for fuel cell vehicle so far. But for the mass production of fuel cell vehicle, it is necessary to evaluate durability and safety in system module. We built the standard to evaluate vibration and collision safety of high pressure storage system for fuel cell vehicle, and could verify reliability of high pressure storage system.
PEMFC에서 전극 열화가 전해질 막 열화에 미치는 영향
박권필 ( Kwon Pil Park ),송진훈 ( Jin Hoon Song ),김세훈 ( Sae Hoon Kim ),안병기 ( Byung Ki Ahn ),고재준 ( Jai Joon Ko ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.1
Until a recent day, degradation of PEMFC MEA (membrane and electrode assembly) has been studied, separated with membrane degradation and electrode degradation, respectively. But membrane and electrode were degraded coincidentally at real PEMFC operation condition. During simultaneous degradation, there was interaction between membrane degradation and electrode degradation. The effect of electrode degradation on membrane degradation was studied in this work. We compared membrane degradation after electrode degradation and membrane degradation without electrode degradation. I-V performance, hydrogen crossover current, fluoride emission rate (FER), impedance and TEM were measured after and before degradation of MEA. Electrode degradation reduced active area of Pt catalyst, and then radical/H2O2 evolution rate decreased on Pt. Decrease of radical/H2O2 reduced the velocity of membrane degradation.
고분자전해질 연료전지에서 기체 크로마토그래프에 의한 수소투과도 측정
정재진 ( Jae Jin Jeong ),정재현 ( Jae Hyeun Jeong ),김세훈 ( Sae Hoon Kim ),안병기 ( Byung Ki Ahn ),고재준 ( Jai Joon Ko ),박권필 ( Kwon Pil Park ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.4
Until a recent day, degradation of PEMFC MEA(membrane and electrode assembly) has been studied, separated with membrane degradation and electrode degradation, respectively. But membrane and electrode were degraded coincidentally at real PEMFC operation condition. During simultaneous degradation, there was interaction between membrane degradation and electrode degradation. Hydrogen permeability was used often to measure degradation of electrolyte membrane in PEMFC. In case of hydrogen permeability measured by LSV(Linear Sweep Voltammetry) method, the degradation of electrode decrease the value of hydrogen crossover current due to LSV method`s dependence on electrode active area. In this study hydrogen permeability was measured by gas chromatograph (GC) when membrane and electrode degraded at the same time. It was showed that degradation of electrode did not affect the hydrogen permeability measured by GC because of GC method`s independence on electrode active area.