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황민영,김용균,전충환,송주헌,김용태,장윤한,Hwang, Min-Young,Kim, Yong-Gyun,Jeon, Chung-Hwan,Song, Ju-Hun,Kim, Yong-Tae,Chang, Youn-Han 한국전기화학회 2009 한국전기화학회지 Vol.12 No.2
리튬 2차전지는 휴대용 전자기기의 전원으로 사용되어 왔다. 최근 하이브리드 자동차, 전기자동차의 에너지 저장매체로써 적용으로 인해 시장 확대가 기대되고 있다. 양극 활물질은 리튬2차전지의 성능, 수명, 용량을 결정하는 물질이며, 급증하는 시장의 수요에 따라 양극 활물질을 대량으로 생산할 수 있는 기술을 개발하는 것이 시급하다. 본 연구에서 실제 양극 활물질($LiCoO_2$) 생산라인에서 가동 중인 소성로를 3D 모델링하였고, 수치적 해석을 통해 소성로 내부의 온도와 유동의 방향, 화학적 거동을 밝혀내었다. 결과로써, 생산량 증가로 인해 소성로에서 생성되는 $CO_2$ 농도가 증가하며 정체되는 지점을 확인하였고, TGA-DSC 실험을 통해 $CO_2$가 몰분율 15%이상에선 $LiCoO_2$의 적절한 형성에 영향을 주는 현상을 확인하였다. 또한 소성로의 형상변화와 공정조건의 변화를 통해 문제되는 $CO_2$를 원활히 배출할 수 있는 해결책을 제안하였다. Lithium secondary batteries have been widely used in the portable electric devices as power source. Recently it is expected that the realm of its applications expands to the markets such as energy storage medium of hybrid electric vehicle(HEV), electric vehicle(EV). Cathode active material is crucial in terms of performance, durability, capacity of lithium secondary batteries. It is urgent to develope the technology for mass production of cathode material to cope with the markets' demands in the near future. In this study, a calcination furnace running in real production line is modelled in 3D, and the thermal flow and gas flow after chemical reaction in the furnace is analyzed through numerical computations. Based on the results, it is shown that large volume of $CO_2$ gas is generated from chemical reaction. High concentration of $CO_2$ gas and it's stagnation is clearly found from the reactant containers in which the reaction occur to the bottom area of the furnace. It is also studied that 15% or more $CO_2$ mol fraction could affect to proper formation of $LiCoO_2$ through TGA-DSC analysis. The solutions to evacuate carbon dioxide from the furnace are suggested through the change of furnace design and operating condition as well.
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김우현 ( Woo-hyun Kim ),권태룡 ( Tae-ryong Kwon ),김용균 ( Yong-gyun Kim ),권순욱 ( Soon Wook Kwon ),오연이 ( Youn-lee Oh ),강민구 ( Min-gu Kang ) 한국균학회 2017 韓國菌學會誌 Vol.45 No.4
양송이 재배에서 큰 피해를 주고 있는 세균성갈색무늬병(bacterial brown blotch disease)을 유발하는 3가지 병원균에 대해 양송이가 가지는 내성이 후세대에 전달되는지 검증한 결과는 다음과 같았다. 세균성갈색무늬병에 대한 양송이의 내성 정도는 균사생장능력과 상관관계가 없었다. 세균성갈색무늬병에 내성이 강하였던 계통의 후세대 단포자들은 균사체 단계에서는 부모세대처럼 강한 내성을 보이지 않으며, 자실체에서는 균사체에 비해 내성은 감소하였다. 세균성갈색무늬병에 내성이 약하였던 계통의 후세대 단포자들은 균사체 단계에서는 부모세대와 마찬가지로 내성이 매우 약하여, 부모세대가 가진 내성이 후세대로 전달되는 것으로 추측되었다. 자실체에서의 내성은 균사체에서 내성 유무와는 상관관계가 없었다. 따라서 자실체의 갈변 현상은 다른 요인이 복합적으로 관여하여 유발될 것으로 판단된다. Pseudomonas tolaasii는 자실체에서 Pseudomonas agarici에 비해서 갈변을 더 높게 유발시켰으며, Pseudomonas reactans는 균사체에는 큰 영향을 주지 못했지만, 자실체의 갈변에는 영향을 주었다. P. agarici는 자실체보다 균사체 생장억제능이 높았다. Pseudomonads cause bacterial brown blotch disease, which causes great damage to the common mushroom Agaricus bisporus. The tolerance of A. bisporus to pseudomonads was tested and found to not be correlated with mycelium growth ability. The offsprings of the tolerant strain (ASI1085) to pseudomonads were not as tolerant as their parents in the mycelium stage. But, tolerance decreased compared to mycelium in the fruiting body. The offsprings of the weakly tolerant strain (ASI1321) were even more weak in the mycelium stage. It is presumed that the tolerance of the parents is transferred to later generations. The tolerance in the mycelium was not correlated in the fruiting body. Therefore, the browning of the fruiting body is thought to be induced by other factors. Pseudomonas tolaasii caused higher browning than Pseudomonas agarici. Pseudomonas reactans did not have a significant effect on the mycelium, but affected the browning of the fruit bodies. P. agarici had higher ability to inhibit mycelium growth than fruiting body growth.
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강용철(Yong-Cheol Kang),박지연(Ji-Youn Park),소순홍(Soon-Hong So),장성일(Sung-Il Jang),김용균(Yong-Gyun Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.11
This paper proposes a compensation method for an air gapped current transformer (CT) in the steady state. An air gapped CT is used in order to reduce a remanent flux in the case of auto-reclosure. It causes larger ratio and angle errors than the closed core CT because the magnetizing inductance of an air-gapped CT is even smaller than the closed-core CT. The core flux is calculated and used to estimate the exciting current in accordance with the hysteresis curve of the air-gapped CT. The correct current is obtained by adding the estimated exciting current to the measured secondary current. The performance of the method was investigated for the air gapped CTs with a gap of 0.083㎜ and 0.249㎜ for the 120%, 100% and 20% of the rated current. Various test results indicate that the proposed compensation algorithm can improves the accuracy significantly.
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姜龍澈(Yong-Cheol Kang),朴志蓮(Ji-Youn Park),鄭太英(Taiying Zheng),張成一(Sung-Il Jang),金容均(Yong-Gyun Kim) 대한전기학회 2008 전기학회논문지 Vol.57 No.2
An air-gapped current transformer (CT) has been used to reduce a remanent flux in the core, particularly in the case of auto-reclosure. However, it causes larger transient, ratio and phase errors than the iron-cored CT because of the small magnetizing inductance. This paper proposes a compensation algorithm for the secondary current of the air-gapped CT during the fault conditions including auto-reclosure as well as in the steady-state. The core flux is calculated from the measured secondary current of the CT and inserted into the hysteresis loop to estimate the exciting current. Finally, the correct current is estimated by adding the measured secondary current to the estimated exciting current. Various test results clearly indicate that the proposed compensating algorithm can improve the accuracy of the air-gapped CT significantly and reduce the required core cross-section of the air-gapped CT significantly.
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황민영(Hwang min young),이종우(Lee jong woo),김용균(Kim yong gyun),전상훈(Jeon Sang hun),장윤한(Chang youn-han),전충환(Jeon chung hwan) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Secondary batteries are uesd cell phone and notebook computer. Cathode active material for the secondary battery is processed in high temperature furnace. Optimizing design for furnace is important to get the best quality of the material. Numerical approach for analyzing the fluid flow in the furnace saves time and money in comparison with experimental method. In this study, a furnace modeled and the boundary conditions are set for CFD analysis. The characteristic of the fluid thermal flow is obtained.
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