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오상협,김명수,이흥락,Oh Sanghyub,Kim Myungsoo,Lee Heung Lark 한국전기화학회 2000 한국전기화학회지 Vol.3 No.2
겔형 VRLA전지의 파손방식을 조사하기 위하여 $100\%$ 방전심도에서 5시간율 전류로 충방전 수명시험을 하였다. 정전압 충전방식을 사용하여 충전전압을 2.40V와 2.50V로 하였을 때 1,000회 이상의 수명을 나타내었으며, 전지의 무게변화를 측정한 결과 각각 426.4g과 391.2g의 전해액이 감소하였다 2.50V로 충전한 전지가 우수한 수명특성을 나타내었으며, 전해액 손실량이 충전계수와 비례하는 것을 알 수 있었다 1,000회의 충방전 수명시험을 한 전지의 양극기판에는 약 $50{\mu}m$의 부식층이 관찰되었고, 활성물질의 미세구조는 크게 변하였다. 양극판의 파손방식은 활물질 탈락이며, 전해액 손실이 방전용량 감소의 원인인 것을 알 수 있었다. Cycle life test was carried out to evaluate the failure modes of the gel type nth batteries at $C_5$ currents and $100\%$ DOD. When the batteries were charged at constant voltage of 2.40 V and 2.50 Vi respectively, cycle lift was over 1,000 cycles. The batteries lost 426.4 g and 391.2 g of electrolyte far each case after the weight measurement. The battery charged at 2.50 V was shown to have a better cyclic performance than charged at 2.40 V, and the amounts of electrolyte loss was proportional to charge factor. After cycle test, the micro-structure of positive active material was completely changed and the corrosion layer of positive grid was about $50{\mu}m$. Failure mode of the positive plate of the gel type battery was a shedding of the positive active material, and the cause of discharge capacity decrease was found to be a electrolyte loss.
Jung, Jinsang,Lee, JaeYong,Kim, ByungMoon,Oh, SangHyub Elsevier 2017 Atmospheric environment Vol.165 No.-
<P>This paper investigates the NO2 artifact associated with the chemiluminescence measurement technique that uses a molybdenum converter by applying the same technique but with a photolytic converter at a site downwind of the Asian continental outflow (Daejeon, Korea). The NO2 to NO conversion efficiencies of the molybdenum and photolytic converters were found to be 100% and 95%, respectively, at an ambient level of NO2 (<100 ppbv). Two NO2 monitors equipped with molybdenum and photolytic converters were deployed for ambient NO2 measurements in Daejeon, Korea between the fall of 2015 and the summer of 2016. It was found that the monitor equipped with the molybdenum converter overestimated NO2 levels by 20.4 +/- 14.7% when compared with the actual NO2 level in the Daejeon atmosphere over the entire measurement period. This NO2 artifact (Delta NO2),A defined as the difference between molybdenum NO2 and photolytic NO2 values, correlated well with the PM2.5 mass concentration during the fall and winter seasons. Based on these findings, this study develops a simple correction model for Delta NO2 using the PM2.5 mass concentration during the fall and winter seasons. The model-corrected NO2 concentration correlated well with the actual NO2 values with a slope of approximately 1.0 and R-2 value of 0.98 during the fall and winter seasons. (C) 2017 Elsevier Ltd. All rights reserved.</P>
Final report: international comparison APMP.QM-S7 methane in nitrogen at 2000 μmol/mol
Kim, Byungmoon,Bae, Hyounkil,Lee, Sangil,Oh, Sanghyub,Lin, Tsai-Yin,Huang, Chiug-Kun,Sinweeruthai, Ratirat,Rattanasombat, Soponrat,Laongsri, Bunthoon,Wongjuk, Arnuttachai,Li, Hou,Hui, Liu,Beng Keat, T IOP Publishing 2015 METROLOGIA -BERLIN- Vol.52 No.1
Impact of Siberian forest fires on the atmosphere over the Korean Peninsula during summer 2014
Jung, Jinsang,Lyu, Youngsook,Lee, Minhee,Hwang, Taekyung,Lee, Sangil,Oh, Sanghyub Copernicus GmbH 2016 Atmospheric Chemistry and Physics Vol.16 No.11
<P>Abstract. Extensive forest fires occurred during late July 2014 across the forested region of Siberia, Russia. Smoke plumes emitted from Siberian forest fires underwent long-range transport over Mongolia and northeast China to the Korean Peninsula, which is located ∼ 3000 km south of the Siberian forest. A notably high aerosol optical depth of ∼ 4 was observed at a wavelength of 500 nm near the source of the Siberian forest fires. Smoke plumes reached 3-5 km in height near the source and fell below 2 km over the Korean Peninsula. Elevated concentrations of levoglucosan were observed (119.7 ± 6.0 ng m−3), which were ∼ 4.5 times higher than those observed during non-event periods in July 2014. During the middle of July 2014, a haze episode occurred that was primarily caused by the long-range transport of emission plumes originating from urban and industrial complexes in East China. Sharp increases in SO42− concentrations (23.1 ± 2.1 µg m−3) were observed during this episode. The haze caused by the long-range transport of Siberian forest fire emissions was clearly identified by relatively high organic carbon (OC) ∕ elemental carbon (EC) ratios (7.18 ± 0.2) and OC ∕ SO42− ratios (1.31 ± 0.07) compared with those of the Chinese haze episode (OC ∕ EC ratio: 2.4 ± 0.4; OC ∕ SO42− ratio: 0.21 ± 0.05). Remote measurement techniques and chemical analyses of the haze plumes clearly show that the haze episode that occurred during late July 2014 was caused mainly by the long-range transport of smoke plumes emitted from Siberian forest fires. </P>
Jung, Jinsang,Lee, Dahee,Jeong, Hyeonjin,Lee, Sangil,Oh, SangHyub Elsevier 2018 Atmospheric environment Vol.178 No.-
<P><B>Abstract</B></P> <P>The long-range transport (LRT) of pollutants between countries in Northeast Asia is a serious issue. However, reliable quantification of LRT pollutants has not been performed due to a lack of clear evidence of the transport between countries. Hourly chemical composition of PM<SUB>2.5</SUB> (particulate matter with a diameter of ≤2.5 μm) was measured continuously at a suburban site in Daejeon, Korea during the Lunar New Year festival period to investigate the influence of firework/firecracker emissions from China over areas downwind subject to LRT. Elevated PM<SUB>10</SUB> (particulate matter with a diameter of ≤10 μm) and PM<SUB>2.5</SUB> mass concentrations were observed over the Korean Peninsula during the third day of the Lunar New Year festival (30 January 2017) when air masses originated from the northern part of China. Water-soluble potassium (K<SUP>+</SUP>), an indicator of both firework/firecracker and biomass burning, increased significantly during the third day of the Lunar New Year festival with an episode to non-episode ratio of 7.5, whereas no increase in levoglucosan, an indicator of biomass burning, was observed. Because firework/firecracker activities do not typically occur over the Korean Peninsula during the Lunar New Year festival, elevated K<SUP>+</SUP> indicates that haze plumes mixed with firework/firecracker emissions in China impacted the Korean Peninsula through the LRT. This study finds, for the first time, clear evidence of the LRT of pollutants between source and receptor countries in Northeast Asia under Asian continental outflow.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Haze caused by firework activities in China impacted on the Korean Peninsula. </LI> <LI> Elevated K<SUP>+</SUP> over the Korean Peninsula was attributed to firework emissions from China. </LI> <LI> This study finds clear evidence of the LRT of pollutants from China to Korea. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>