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이준철 ( Jun Cheol Lee ),구본윤 ( Bon Yoon Koo ),윤춘식 ( Chun Sik Yoon ),이동준 ( Dong Jun Lee ),정선우 ( Seon Woo Cheong ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.2
The studies on community structure of benthic macroinvertebrates and environmental survey in selected four sites were performed on wetland Upo from 2008 to 2009. The lowest water temperature was measured at Upo and Mokpo showing 7℃ in February of 2008 and 2009 respectively. The highest water temperature was measured at Upo showing 32℃ in August of 2009. The lowest pH was measured at Topyeong with 5.3 in August of 2009, and the highest pH was measured at Mokpo with 10.1 in August of 2008. Generally the levels pH of 2008 were higher than those of 2009. The range of electric conductivity to the sites was big. Overall, the higher electric conductivity was seen at Sajipo and the lower one was seen at Mokpo. The level of Dissolved oxygen was lowest at Upo with 5.53㎎/ℓ in August 2008, and it was highest at Upo with 14.76㎎/ℓ in February of 2008. The investigation was performed with both quantitative and qualitative collecting methods from four surveying sites, Upo, Mokpo, Sajipo and Topyeong. Through the eight times of seasonal survey, 6 classes, 17 orders, 59 families, 131 species and 5460 individuals of benthic macroinvertebrates were collected. 6 classes, 17 orders, 53 families 106 species and 2439 individuals were identified in 2008, and 6 classes, 16 orders, 44 families, 93 species and 3021 individuals were collected in 2009. The number of species was decreased in 2009 comparing that of 2008, however, the number of individuals were increased in 2009. The dominant species and the subdominant species was Plea (Paraplea) indistinguenda and Diplonychus esakii with 20.16% and 11.90% of dominant indices respectively. From the community analysis, both the species diversity index and the species richness index were highest in Topyeong showing 4.743 and 9.054 respectively. The similarity evaluation to the investigation sites with the species in there showed very high similarity among Upo, Mokpo and Sajipo showing 5 or lower levels of distance cluster combine.
이준철(Jun Cheol Lee),김재형(Jae Hyung Kim),최광근(Kwang Keun Choi),박대원(Dae Won Pak) 大韓環境工學會 2008 대한환경공학회지 Vol.30 No.9
유기성 폐기물을 이용하여 생산된 수소를 환원제로 활용하여 이산화탄소를 유용한 에너지원인 메탄으로 전환시키고자 하였다. 3개월 동안 혐기성 미생물을 이산화탄소와 수소만을 이용하여 배양하였으며, 그 결과 acetogenotrophs의 영향에 의한 메탄의 생성은 없었고, 이산화탄소를 8 mL/min으로 주입하였을 때 이산화탄소와 수소의 주입비가 1:5에서 메탄의 생성량이 2.2 m3/m3day로 가장 많았으며, 이때의 이산환탄소 저감률 또한 92%로 가장 우수하였다. 회분형태로 수소 생산과 메탄발효조와의 연계실험을 통하여, 연속적으로 수소를 생산하면서 이산화탄소를 같이 메탄발효조에 주입하여, 이산화탄소의 메탄으로의 전환을 확인하였다. In the present study, carbon dioxide was converted to methane, using bio-hydrogen. Here, the bio-hydrogen was produced from organic waste. The anaerobic microorganism was cultured using only carbon dioxide and hydrogen for duration of 3 months. Therefore methane was not produced with acetogenotrophs. During methane production, carbon dioxide and hydrogen are taken in different ratios; among which 1:5 ratio has shown the highest methane yield. Carbon dioxide and hydrogen were introduced into the reactor at the rate of 8 mL/min and 40 mL/min, respectively. In this case, 92% of carbon dioxide was reduced and 2.2 m3/m3 day amount of methane was produced. Thus, the process has been successful in conversion of carbon dioxide into methane by purging it into methane fermentation reactor with bio-hydrogen using batch process.
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.
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.
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.
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.
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.