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- 저자 : 김병관(Byoungkwan Kim) (검색결과 3 건)
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석탄가스화 복합발전 슬래그의 알칼리 활성 시멘트로서의 가능성
김병관,이수정,전철민,최홍식,Kim, Byoungkwan,Lee, Sujeong,Chon, Chul-Min,Choi, Hong-Shik 한국자원리싸이클링학회 2018 資源 리싸이클링 Vol.27 No.2
Integrated gasification combined cycle (IGCC) is a next generation energy production technology that converts coal into syngas with enhanced power generation efficiency and environmental performance. IGCC produces almost coal gasification slag as the solid by-product. IGCC slag is generated about 140,000 tons for a year although recycling of it is still in the early stages. We evaluated the potential of IGCC slag which is generated from a pilot plant in South Korea as an alkali-activated cement. Samples which were activated with the combined activator of sodium silicate solution and caustic soda had an average compressive strength of 4.5 MPa, showing expansion. Expansion of the alkali-activated slag was presumed to be caused by free CaO in the slag, although it was not detected by the ethylene glycol method. Samples that were activated with the combined activator of sodium aluminate and caustic soda had an average compressive strength of 10 MPa. Hydroxy sodalite and $C_3AH_6$ were found to be the new crystalline phases. IGCC slag can be used as an alkali-activated material, but the strength performance should be improved with proper mix design approach to calculate optimum proportions which can alleviate the expansion issue at the same time.
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Na/Al 비와 양생온도가 지오폴리머의 백화억제에 미치는 영향
김병관,허예은,전철민,이수정,Kim, Byoungkwan,Heo, Ye-Eun,Chon, Chul-Min,Lee, Sujeong 한국자원리싸이클링학회 2018 資源 리싸이클링 Vol.27 No.6
Efflorescence is a white deposit of powders in the surface of cement concrete which can also occur in geopolymers. Efflorescence occurs when sodium ions in alkali activator react with atmospheric carbon dioxide to form sodium carbonate components. In this study, we investigated whether the secondary efflorescence can be reduced by controlling the Na/Al mole ratio or by changing the curing temperature and heat curing time in fly ash-based geopolymers. The 28 days compressive strength in geopolymers having Na/Al ratio of 1.0 was higher than geopolymers having Na/Al ratio of 0.8. The strength increased with the increasing curing temperature and longer heat curing time. On the other hand, efflorescence was lower when the curing temperature was high and the heat curing time was longer in the geopolymers having Na/Al ratio of 1.0. The geopolymers having Na/Al ratio of 0.8 showed accelerated efflorescence occurrence than the geopolymers having Na/Al ratio of 1.0. In order to reduce the occurrence of the secondary efflorescence of fly ash-based geopolymers, it will be advantageous to maintain the Na/Al ratio at 1.0, increase the curing temperature, and lengthen the heating curing time.
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Virtual Bus 개념의 CAN-Ethernet 게이트웨이 설계
김병관(Byoungkwan Kim),신봉걸(Bongkeol Shin),장주욱(Ju wook Jang) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
The Controller Area Network (CAN) is a commonly used technology for connecting electronic control units (ECUs) in the vehicles. However the number of ECUs in vehicle is increasing and data traffic is increasing suddenly by real time service like Topview. Therefore Ethernet backbone is proposed to solve this problem, and CAN-Ethernet gateway becomes crucial. In AUTOSAR 4.1, they proposed CAN-Ethernet gateway which has First In First Out (FIFO) queues for storing messages before transmitting them. However, FIFO queues are not guarantee that priority of messages when low priority message is arrive faster than high priority message. In this paper we propose new CAN-Etehrnet gateway to which is applied a Virtual Bus. This scheme is guarantee that priority of messages and decrease transmisson delay of high priority messages.
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