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이주광,조용남,Lee, Ju Kwang,Jo, Yong Nam 한국재료학회 2020 한국재료학회지 Vol.30 No.12
A zinc-air battery consists of a zinc anode, an air cathode, an electrolyte, and a separator. The active material of the positive electrode is oxygen contained in the ambient air. Therefore, zinc-air batteries have an open cell configuration. The external condition is one of the main factors for zinc-air batteries. One of the most important external conditions is temperature. To confirm the effect of temperature on the electrochemical properties of zinc-air batteries, we perform various analyses under different temperatures. Under 60 ℃ condition, the zinc-air cell shows an 84.98 % self-discharge rate. In addition, high corrosion rate and electrolyte evaporation rate are achieved at 60 ℃. Among the cells stored at various temperature conditions, the cell stored at 50 ℃ delivers the highest discharge capacity; it also shows the highest self-discharge rate (65.33 %). On the other hand, the cell stored at 30 ℃ shows only 2.28 % self-discharge rate.
이주광,김정환,강진섭,강태원,Lee Joo-Gwang,Kim Jeong-Hwan,Kang Jin-Seob,Kang Tae-Weon 한국전자파학회 2006 한국전자파학회논문지 Vol.17 No.4
K-대역에서 동작하는 3.5 mm 동축형 감쇠량 표준기를 개발하고 그 측정 불확도를 평가하였다. 전력비 전달방식의 4개의 모듈로 구성된 이 표준기는 18 GHz부터 26.5 GHz까지의 광대역에서 동작하며 각 모듈은 약 20 dB의 감쇠량을 가진다. 측정 가능한 최대 감쇠량은 80 dB이고 이때의 확장 불확도는 약 95% 신뢰수준에서 0.01 dB이다. In this paper, measurement scheme and uncertainty estimation of the K-band attenuation standard fitted with 3.5 mm coaxial connectors are described. The standard comprises a build-up chain of four steps of power ratio mea-surement and operates in the frequency range of 18 GHz to 26.5 GHz. The nominal attenuation of each step is around 20 dB and total dynamic range is 80 dB. The expanded uncertainty of the overall system is 0.01 dB at the confidence level of approximately 95%.
강릉시 식수계중 휘발성 유기화합물질 ( VOCs ) 의 분포
이주광,이승목,윤이용 ( Ju Goang Lee,Seung Mok Lee,Yi Yong Yoon ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.3
A survey of Volatile Organic Compounds(VOCs) was conducted in the Kangnung City raw water, treated water and groundwater from Mar. 1994 to Dec. 1994. Four VOCs. 1,1,1- trichloroethane, carbon tetrachloride, trichloroethylene and tetrachloroethylene, were detected below detection limit level. Among those, 1,1,1-trichloroethane, carbon tetrachloride and trichloroethylene were detected at trace and frequently. Trichloroethylene was contaminated in the highest level among detected four VOCs. The mean concentrations of trichloroethylene were 1.15㎍/ℓ of the raw water, 3.30㎍/ℓ of the treated water and 0.47㎍/ℓ of the groundwater. respectively. The concentration levels of the VOCs from the raw water and the treated water were increased from winter to summer, while this trend cannot be found in groundwater.