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비정질 붕소강 섬유를 혼입한 콘크리트의 역학적 성능 및 중성자 차폐성능 평가
이준철 ( Lee Jun Cheol ),김화중 ( Kim Wha Jung ) 한국건축시공학회 2017 한국건축시공학회지 Vol.17 No.1
본 연구에서 비정질 붕소강 섬유를 혼입한 콘크리트의 역학적 성능 및 중성자 차폐성능을 평가하였다. 비정질 붕소강 섬유를 콘크리트 체적 대비 0.25%에서 1.0%까지 혼입하여 굳지 않은 콘크리트의 공기량과 슬럼프값, 경화된 콘크리트의 압축강도, 휨강도, 휨인성 및 중성자 차폐성능을 평가하였다. 실험결과, 비정질 붕소강 섬유의 혼입량이 증가할수록 콘크리트의 휨인성 및 중성자 차폐성능이 향상되는 것으로 나타났다. 이를 통해 비정질 붕소강 섬유의 혼입이 중성자차폐성능 뿐만 아니라 역학적 성능을 효과적으로 개선시켜줄 것이라고 기대된다. Mechanical properties and neutron shielding performance of concrete with amorphous boron steel fiber have been investigated in this study. The measurement of this investigation includes air contents, slump loss, compressive strength, flexural strength, flexural toughness and neutron shielding rate. Four different fiber volume fractions were selected ranging from 0.25% to 1.0% by volume for the amorphous boron steel fibers. The testing results showed that the flexural toughness and the neutron shielding rate were increase with the increase of volume fraction for amorphous boron steel fiber. Based on the result, it is concluded that the concrete with the amorphous boron steel fiber can be effectively applied to shield the neutron and to improve mechanical properties.
이준철(Lee, Jun-Cheol),김화중(Kim, Wha-Jung),천우영(Chun, Woo-Yong),이창준(Lee, Chang-Joon) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.7
This study investigated the effect of microorganisms on compressive strength development of cement paste. The Sporosarcina pasteurii used in this study was capable of microbial induced calcite precipitation(MICP). Four different cell concentrations were selected ranging from 10 to 10? per ml. distilled water as mixing water. From experimental results, cement paste with microorganisms showed higher strength gain compared with reference cement paste at earlier ages. From TG/DSC analysis, more calcium hydroxide was observed in the cement paste with microorganisms. The degree of hydration of the cement paste with microorganisms, evaluated by measuring non-evaporable water contents in cement paste, was also higher than that of reference cement paste. It is very likely that the strength improvement of cement paste is due to acceleration of hydration process caused by the metabolism of microorganisms. Further investigation is in progress to identify the specific mechanisms which is responsible for the improvement of compressive strength in early ages.
이종접합 나노 광촉매를 이용한 시멘트 모르타르의 물성 평가
이준철 ( Lee Jun-cheol ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
The properties of cement mortar with nano-heterojunction photocatalysts were investigated in this study. The following tests were conducted with the cement mortar : (1) Flow test of fresh cement mortar, (2) compressive strength and (3) acetaldehyde removal efficiency under visible light. Results indicated that the cement mortar with nano-heterojunction photocatalysts showed higher compressive strength and higher acetaldehyde removal efficiency as the mixing ratio of nano-heterojunction increased.
전기화학적 방법의 TRC(Total residual chlorine) 측정 연구(II: Pt전극 이용)
이준철 ( Jun Cheol Lee ),박대원 ( Dae Won Park ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.3
The conventional methods for total residual chlorine such as iodometry and DPD colorimetric can cause secondary pollution due to additional agents, also have a wide error range. As for alternative, electrochemical method can measure TRC(Total residual chlorine), and is not required as additional agents, also very suitable for using the fields of ballast water because test time is relatively fast. Therefore, this study was investigated for changing charge by agitation, salt concentration, and temperature change. Charge showed differences based on changes of reduction peak with or without agitation. In contrast, TRC and charge were well correlated in constant agitation speed. As TRC and charge were analyzed with high correlations in constant salinity and temperature of ocean, thereby conductivity was firstly measured, and charge had high correlation for TRC in spite of changing salinity and temperature Pt electrode revealed high reliability (r2 = 0.960) because it was rarely effected by TRC, On the other hand, Au electrode appeared inadequate (r2 = 0.767) to use sensor in less than 1.0 ppm of TRC. For high accuracy and detection of TRC, Pt and Au electrodes for test time were, respectively, 14 and 22 seconds. As a result, Pt electrode was more valuable than Au electrode in terms of response time.
이준철(Jun Cheol Lee),박대원(Dae Won Pak) 大韓環境工學會 2012 대한환경공학회지 Vol.34 No.11
단위면적당(cm2) 루테늄의 코팅량이 1.5 mg, 2.5 mg, 3.5 mg, 5.5 mg, 8.5 mg의 RuO₂/Ti 전극을 제조하여 코팅량에 따른 전기화학적 특성 차이와 염소 발생에 미치는 영향을 조사하였다. 순환전압 실험 결과 루테늄이 코팅된 전극의 염소 발생 과전압은 약 1.15 V (vs. Ag/AgCl)로 거의 일정하였다. 그러나 교류 임피던스 분광법, 동전위분극실험 결과 단위면적당(cm2) 루테늄의 코팅량이 2.5 mg, 3.5 mg RuO₂/Ti 전극의 저항은 각각 0.4582 Ω, 0.5267 Ω, 부식속도는 각각 0.082 mm/yr, 0.058 mm/yr로 내구성이 가장 우수하였다. 염소 발생량은 단위면적당(cm2) 루테늄의 코팅량 3.5 mg 전극이 15.2 mg/L로 가장 높게 측정되었다. We investigated the effects of electrochemical characteristics and generation of chlorine by the different amount of Ru coating which was prepared for RuO₂/Ti electrode coated with 1.5 mg, 2.5 mg, 5.5 mg, 8.5 mg Ru per unit area (cm2). As a Result of the cycle voltammetry experiments, chlorine overvoltage of Ru-coated electrodes showed to be the nearly sustained value of approximately 1.15V (vs. Ag/AgCl). By contrary, According to the results of the AC impedance spectroscopy and potentiodynamic polarization tests, the amount of Ru per unit area (cm2) included 2.5 mg, 3.5 mg as RuO₂/Ti offered the highest levels of durability which was electrode resistance and corrosion rate appeared to be 0.4582 Ω, 0.5267 Ω and 0.082 mm/yr, 0.058 mm/yr, respectively. It was also observed that generation of chlorine coated with 3.5 mg per unit area (cm2) was the highest value of 15.2 mg/L.
이준철(Lee, Jun-Cheol),류상률(Ryu, Sang-Ryul) 한국산학기술학회 2008 한국산학기술학회 학술대회 Vol.- No.-
본 논문에서는 MPEG-4 기반으로 다시점 동영상 재생을 위한 전송방법을 제안한다. 그리고 MP4 파 일포맷을 분석하여 OSMO₄에서 제공하는 MP4BOX를 이용해서 동영상을 MP4 파일로 변환한다. 기존 의 MPEG4 플레이어는 다시점 동영상을 전송하기 위한 정보들이 부족하여 활용하지 못하지만, 새로운 객체 기술자와 BIFS 구조를 추가하여 OSMO₄ 플레이어에 입력되는 MP4 파일이 다시점 동영상임을 알 수 있게 하여 OSMO₄에서 다시점 동영상 시점 전환이 가능하도록 한다. 실험은 여러 개의 영상에 대한 시점의 스위칭을 수행했으며, N개의 다시점 동영상으로도 확장이 가능함을 보여준다.