높은 산소과전압과 내구성의 이산화납전극 제조에 관한 연구

김재관,최병선,남종우 ( Jae Kwan Kim,Byun Sun Choi,Chong Woo Nam ) 한국공업화학회 1996 공업화학 Vol.7 No.6

α-pbO₂/IrO₂-TiO₂/Ti지지체상에 sodium lauryl sulfate 및 TiO₂ 분말을 첨가한 질산납 전해액에서 전착한 β-PbO₂층의 특성 및 성능을 XRD, SEM, cyclic voltammograms, 매크로전해를 이용하여 검토하였다. XRD분석결과 sodium lauryl sulfate 및 TiO₂분말의 존재하에 α-pbO₂/IrO₂-TiO₂/Ti지지체 위에 전착한 β-PbO₂층은 순수한 β-PbO₂층과 마찬가지로 정방정계구조를 나타냈다. SEM결과 sodium lauryl sulfate는 전착충의 결정입자크기를 작게 하는 경향을 보여준다. sodium lauryl sulfate 및 TiO₂분말의 존재하에 전착한 β-PbO₂전극은 KOH 및 HClO₄지지전해질에서 양극산화에 대한 산소과전압과 내구성을 크게 향상시켰다. 티타늄마드래스에 전착시킨 β-PbO₂전극을 이용하여 과염소산용액으로부터 오존발생에 대한 전극성능과 내구성을 검토하였다. HClO₄지지전해질에 sodium lauryl sulfate와 TiO₂분말을 첨가하여 α-pbO₂/IrO₂-TiO₂/Ti마드래스상에 전착한β-PbO₂전극이 가장 높은 전류효율과 내구성을 가짐을 확인하였다. The characteristic and performance of β-PbO₂ layer electrodeposited on α-PbO₂/IrO₂-TiO₂/Ti substrate by adding sodium lauryl sulfate and TiO₂powder in lead nitrate solution were investigated by using XRD, SEM, cyclic voltammograms, and macro-elctrolysis. Results of XRD analysis ascertain that β-PbO₂ layers electrodeposited in the presence of sodium lauryl sulfate and TiO₂powder on α-PbO₂/IrO₂-TiO₂/Ti substrate have the same tetragonal structure as pure β-PbO₂ layers. The SEM results show that sodium lauryl sulfate tend to diminish crystal size of the deposited layer. The β-PbO₂ electrode electrodeposited in the presence of sodium lauryl sulfate and TiO₂powder gives significantly improved oxygen overvoltage and durability for anodic oxidation in KOH and HClO₄supporting electrolyte. Electrode performance and durability for the evolution of ozone in perchloric acid solution have been investigated by using β-PbO₂ electrodes electrodeposited on Titanium madras^ . It was ascertained that the PbO₂ electrode electrodeposited on α-PbO₂/IrO₂-TiO₂/Ti madras^ by adding sodium lauryl sulfate and TiO₂ powder in HClO₄ supporting electrolyte had the highest current efficiency and durability.

추계학적 선진원 모델과 층상반무한체에서의 탄성파 전파 해석법에 의한 지진 지반운동 합성

김재관,권기준,KIM, Jae Kwan,KWON, Ki Jun 한국강구조학회 1996 韓國鋼構造學會 論文集 Vol.8 No.3

A Stochastic line source model is developed to simulate the seismic wave field generated during the rupture propagation process along a fault plane of which length is much larger than its width. The fault plane is assumed to consist of randomly distributed slip zones and barriers and each slip zone is modeled as a point source. By combining the newly developed source model with wave propagation analysis method in a layered 3-D visco-elastic half space, synthetic seismograms are obtained. The calculated accelerograms due to vertical dip slip and strike slip line sources are presented.

전착 이산화납전극의 제조 및 특성에 관한 연구

김재관,이충영,남종우 ( Jae Kwan Kim,Chung Young Lee,Chong Woo Nam ) 한국공업화학회 1993 공업화학 Vol.4 No.2

티타늄마드래스 소지에 PbO_2를 전착하는 과정에서 전해액에 여러 가지 산과 유기물질의 첨가는 PbO_2전착층의 물성에 큰 영향을 준다. XRD결과 β-PbO_2가 산성 전해액에서 전착되는 것을 확인하였다. 본 실험에서 사용된 첨가제 중 전해액에 sodium louryl sulfate를 첨가할때 산소과전압이 가장 높은 PbO_2가 전착되었으며 polyethylene glycol을 첨가할때는 염소과전압이 가장 낮은 PbO_2가 전착되었다. PbO_2의 산소과전압과 염소과전압은 PbO_2를 전착하는 동안 행하는 교반에 크게 의존한다. SEM결과 전착하는 동안 교만하지 않고 전착한 PbO_2결정이 교반하여 전착한 PbO_2보다 더욱 크다는 것을 관찰하였다. 또한 산성전해액에서 PbO_2를 전착할 경우, PbO_2결정 크기가 클수록 산소과전압은 커지며 PbO_2결정 크기가 작을수록 염소과전압은 낮아졌다. HClO_4의 존재하에서 PbO_2를 전착할 경우 560g/1 Pb(NO_3)_2, 65∼70℃, pH>1에서 최적의 전착전류효율을 나타내었다. Addition of various acids or organic compounds to the electrolyte solution during the electrodeposition of PbO_2 on titanium madras substrate strongly affected performance of the deposited PbO_2 layer. Results of X-ray diffractometry ascertained that β-PbO_2 was deposited in acidic electrolyte. Among additives used in this experiment, PbO_2 with a high oxygen overvoltage was electrodeposited when sodium lauryl sulfate was added, and PbO_2 with a lower chlorine overvoltage was electrodeposited when polyethylene glycol was added to the electrolyte solution. The oxygen and chlorine overvoltage of PbO_2 was strongly dependent on the stirring provided during the electrodeposition experiment. It was observed by the SEM results that the PbO_2 grains deposited when stirring was not provided during the electrodeposition have larger than PbO_2 grains deposited by stirring. In the PbO_2 deposition under acidic electrolyte, the oxygen overvoltage increased with larger PbO_2 grains and the chlorine overvoltage decreased with smaller PbO_2 grains. The optimal current efficiency of PbO_2 in the presence of perchloric acid was observed at Pb(NO_3)_2, 560g/1, 65∼70℃, and pH>1.

석탄회 중 미연탄소의 분리에 관한 연구

김재관,조희찬,최병선 ( Jae Kwan Kim,Hee Chan Cho,Byung Sun Choi ) 한국공업화학회 1997 응용화학 Vol.1 No.1

KEPRI is conducting a project for the separation of unburned carbon from fly ash with an objective of constructing a 30t/h commercial plant. To develop a separation scheme, fly ashes were collected from various power plants and analyzed for their physical characteristics. It was found that coarse fly particles were carbon rich and removal of these particles from bulk fly ash could reduce the LOI content to less than 3% at a yield over 70%. For this purpose, a sepecial type of cyclone with guide vanes was built to separate the coarse fly ash particles. Test results showed that a sample of fly ash with 6.0% LOI could be processed into a product containing 3.0% LOI. Generally though, the results were not as good as expected due to the inefficent size saparation and more importantly due to the break-up of the coarse carbon rich particles. Therefore, an additional measure is being taken to enhance the separation by incorporating the electrostatic forces.

재연소를 이용한 NOx 저감의 실험적 연구 및 FLUENT를 이용한 수치적 연구

김재관(Jae Kwan Kim),김학영(Hak Young Kim),백승욱(Seung Wook Baek) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11

Reburning is an efficient combustion technology to reduce nitrogen oxide by injecting hydro-carbon fuel to the downstream of the main combustion. In this paper LPG has been used not only as main fuel but also as reburn fuel and air was used as an oxidizer with 15㎾ swirl burner. Experimental studies have been done to evaluate effect of reburning for NOx reduction. Also to examine the effect of the amount of burnout air for complete combustion by reburn fuel on NOx reduction, test was conducted by reducing the amount of burnout air. Computational fluid dynamic (CFD) simulation was performed using the commercial CFD code FLUENT 6.3 to simulate experimental results and investigate the thermo-chemical characteristics. An evaluation of reaction models for swirl burner has been carried out for propane-air with two step finite-rate eddy-dissipation model in FLUENT.

345㎸ GIS 변전소 뇌써지 해석

김재관(Jae-Kwan Kim),이종범(Jong-Beom Lee),조한구(Han-Goo Cho) 대한전기학회 2003 대한전기학회 학술대회 논문집 Vol.2003 No.7

싸이클론 분급기를 이용한 석탄회 중 미연탄소의 분급특성

김재관(Jae Kwan Kim) 한국공업화학회 2001 공업화학 Vol.12 No.5

N/A N/A

댐-호소계 지진응답의 Hybrid 해석법

김재관(Kim Jae Kwan),조정래(Cho Jeong Rae),이진호(Lee Jin Ho) 대한토목학회 2000 대한토목학회논문집 A Vol.20 No.2A

21세기 미국의 재균형 전략과 북,중,러 삼각관계에 대한 영향 고찰

김재관 ( Jae Kwan Kim ) 조선대학교 동북아연구소(구 통일문제연구소) 2013 동북아연구 Vol.28 No.2

이 글은 미국의 전략구상인 “아태 전략적 재균형” 및 “아시아 회귀” 정책이 동북아 주요 국가인 중국·러시아·북한에 미치는 영향을 주로 분석하고 있다. 21세기에 접어들면서 미국은 중국과 러시아를 견제하기 위하여 두 가지 글로벌 대 전략인 나토의 동진확대 전략과 아태 재균형 전략 구상을 추진해왔다. 이 전략구상에 맞서기 위해 중러 양국은 긴밀히 협조 및 연대를 강화해오고 있다. 특히 중국은 미국의 아태 전략적 재균형 정책이 의심의 여지없이 동 지역 내 중국의 부상을 차단하려는 봉쇄 정책들 가운데 하나라고 판단하고 있다. 따라서 이런 상황 하에서 시진핑 시대 중국은 미국과의 충돌을 피할 뿐만 아니라 미국과의 건실한 관계를 유지하기 위해 소위‘신형대국관계’를 모색하고 있다. 나아가 한편으로 중국과 러시아는 양국관계 뿐만 아니라 다른 한편으로 한층 더 굳건해지고 있는 해양세력인 한·미·일 삼각군사협력을 견제하기 위해 대륙세력으로서의 북·중·러 삼각관계를 강화할 필요성이 높아졌다. 하지만 실제로는 재균형 전략을 이용한 미국의 아태지역내 개입으로 말미암아 필자가 보기에 북·중·러 삼자 사이에 굳건하고도 안정적인 삼각안보 틀을 수립하고 공고화할 수 있을지는 불투명해 보인다. 그러므로 이들 삼각관계는 일시적이며 불안정한 것으로 보이며, 그들이 기대하는 것보다 아직 레짐으로서 안정적으로 제도화되지 못할 것으로 판단된다. This paper asserts that America`s strategic initiatives, “Rebalancing” towards the Asia-Pacific region and “Pivot to Asia”, has had a great influence on major states in Northeast Asia such as China, Russia, and North Korea. In order to contain China and Russia, the United States has proceeded to carry out two global strategies, namely NATO`s Enlargement in the East and Rebalancing toward the Asia-Pacific region throughout the 21st Century. In response to the these strategic initiatives, China and Russia have not only built a strong solidarity, built also continuously reinforced overall cooperation in the region. Especially, the Chinese Government undoubtedly regards this rebalancing strategy as a kind of containment policy to block China from emerging in the Asia-Pacific. Under this circumstance, China has consistently attempted not only to avoid conflict between the US and China , but also to establish and manage so called a “New Type of Great Power relations” among them under the Xijinping`s Regime. In addition, on the one hand, it is urgent for the China and Russia to strengthen a bilateral relationship between two nations. On the other hand, China, Russia, and North Korea as Continental power have been demanded to build a trilateral relationship in order to deter tighter trilateral military cooperations between the U.S. Japan, and South Korea as Sea power. However because of America`s intervention on this region using rebalancing strategy, it would be unpromising that China, Russia, and North Korea could establish and consolidate a firm and stable trilateral architecture of security. So as far as I see, these trilateral relations seem to be transient and unstable. They would be no more able to build a regime as a stable institution than an expectation.

탄화도별 발전연료의 자연발화 특성 평가

김재관(Jae-Kwan Kim),박석운(Seok-Un Park),정재혁(Jae-Hyeok Jeong),신동익(Dong-Ik Shin),홍준석(Jun-Seok Hong),홍진표(Jin Pyo Hong) 한국에너지학회 2017 에너지공학 Vol.26 No.3