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탄소섬유 및 유리섬유로 보강한 재생 폴리머 콘크리트의 공학적 특성
노진용,성찬용,Noh, Jin Yong,Sung, Chan Yong 한국농공학회 2016 한국농공학회논문집 Vol.58 No.3
This study was performed to evaluate engineering properties of carbon and glass fiber reinforced recycled polymer concrete. Fiber reinforced recycled polymer concrete were used recycled aggregate as coarse aggregate, natural aggregate as fine aggregate, $CaCO_3$ as filler, unsaturated polyester resin as binder, and carbon and glass fiber as fibers. The compressive and flexural strength of carbon fiber reinforced recycled polymer concrete were in the range of 68~81.5 MPa and 19.1~21.5 MPa at the curing 7days. Also, the compressive and flexural strength of glass fiber reinforced recycled polymer concrete were in the range of 69.4~85.1 MPa and 19~20.1 MPa at the curing 7days. Abrasion ratio of carbon and glass fiber reinforced recycled polymer concrete were decreased 21.6 % and 11.6 % by fiber content 0.9 %, respectively. After impact resistance test, drop numbers of initial and final fracture were increased with increase of fiber contents. Accordingly, carbon fiber and glass fiber reinforced recycled polymer concrete will greatly improve the hydraulic structures, underground utilities and agricultural structures.
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폐타이어 칩 및 에폭시를 활용한 탄성 복합체의 개발 - 강도와 내구성을 중심으로 -
성찬용,노진용,Sung, Chan Yong,Noh, Jin Yong 한국농공학회 2016 한국농공학회논문집 Vol.58 No.1
This study was performed to evaluate the strength and durability properties of modified epoxy composites with waste tire chip, recycled coarse aggregate, filler and modified epoxy to improve elongation and elasticity of epoxy. Additionally, for comparing to modified epoxy and unsaturated polyester resin as a binder, unsaturated polyester resin composites were developed in the same condition. The mix proportions were determined to satisfy the requirement for the workability and slump according to aggregate size and binder content. Tests for the compressive and flexural strength, freezing and thawing and durability for 20 % sulfuric solution were performed. The compressive and flexural strength of modified epoxy composites were in the range of 34.9~61.6 MPa and 10.2~18.3 MPa at the curing 7 days, respectively. Also, the compressive and flexural strength of unsaturated polyester resin composites were in the range of 44.2~77.8 MPa and 11.3~20.8 MPa at the curing 7 days, respectively. After 300 cycles of freezing and thawing, weight decrease ratio and durability factor of modified epoxy composites were in the range of 0.8~1.9 % and 95~98, respectively. Accordingly, modified epoxy composites will greatly improve the durability of concrete.
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저병원성 조류인플루엔자 감염에 따른 육계의 면역인자 변화
김덕환(Deok-Hwan Kim),김규직(Kyu-Jik Kim),노진용(Jin-Yong Noh),이선학(Sun-Hak Lee),송창선(Chang-Seon Song),박혜경(Hae Kyoung Park),남상섭(Sang-Soep Nahm) 한국가금학회 2020 韓國家禽學會誌 Vol.47 No.4
가금산업에서 전염성 질병은 농장의 생산성에 악영향을 미치는 중요한 요인이다. 그 중 저병원성 조류인플루엔자는 산란율과 증체율에 영향을 준다. 본 연구에서는 육계에서 저병원성 조류인플루엔자 감염시 혈청 단백질 및 사이토카인의 변화 양상을 조사하였다. 1일령의 육계를 1주령부터 4주령까지 각 주령마다 저병원성 조류인플루엔자를 공격 접종 후 혈중 chDBP, Chicken Ovotransferrin, chIL-1β, chIL-6, chIFN-γ의 양을 비교하였다. 어린 주령에 저병원성 조류인플루엔자를 공격접종한 그룹에서는 4주령에 음성대조군과 비교해 chIL-1β, chIL-6가 유의성 있는 낮은 값을 보이는 것을 확인하였다. 추가적인 연구를 통하여 chIL-1β, chIL-6가 질병의 경과를 확인할 수 있는 보조적인 감염 지표로 활용될 수 있을 것으로 판단된다. Avian influenza virus infection, one of the most important diseases recognized in the poultry industry, is known to cause changes in cytokine and serum protein levels. However, the normal ranges and/or age-dependent changes in important cytokines and serum proteins associated with influenza infection have not been fully elucidated. In this study, the levels of cytokines (interleukin-1β, interleukin-6, and interferon-γ) and serum proteins (vitamin D binding protein and ovotransferrin) were determined in 1-week- to 4-week-old broilers at 1-week intervals after challenge with a low pathogenic influenza virus. The results showed that the physiological levels of cytokines and serum proteins varied with aging during the 4 weeks. The levels of interleukin-1β and interleukin-6 increased from 20% to 35% after influenza infection compared to those in the negative control group, indicating that these cytokines may be used to monitor disease progression.
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