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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.
반응표면분석법을 이용한 가압성형 보드의 최적 배합비 산정
이준철 ( Lee Jun-cheol ),김진성 ( Kim Jin-sung ),이보경 ( Lee Bo-kyeong ),최형길 ( Choi Hyeong-gil ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1
In this study, the optimization of mixing proportion of press-forming board with blast furnace slag, pearlite and bottom ash was investigated using the response surface methodology. Ten Mixing proportions of specimens were designed by the response surface design, and then flexural failure load, moisture content and water absorption of specimens were measured. As a result of the reaction surface analysis based on the experimental results, it was possible to derive the optimal mixing proportion with the satisfaction of 93%.
그래핀-이산화티탄 복합 나노와이어를 혼입한 모르타르의 물성 평가
이준철 ( Lee Jun-cheol ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
The properties of cement mortar with graphene-titanium dioxide composite nanowires (TiO2(G)NW) were investigated in this study. The following tests were conducted with the cement mortar : (1) setting times (2) Flow test of fresh cement mortar, (3) compressive strength and (4) acetaldehyde removal efficiency under visible light. As the increase of TiO2(G) NW, the flow value of cement mortar was decreased and the setting times of cement mortar were faster. The compressive strength and the acetaldehyde removal efficiency were increased by the increase of TiO2(G) NW.
회분식 반응기에서 음식물쓰레기를 이용한 바이오에탄올 생산
이준철(Jun Cheol Lee),김재형(Jae Hyung Kim),박홍선(Hong Sun Park),박대원(Dae Won Pak) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.6
유기성 폐기물인 음식물쓰레기를 이용하여 유용한 에너지원인 바이오에탄올을 생산하고자 하였으며, 에탄올 생산 균주는 Saccharomyces cerevisiae를 이용하였다. 음식물쓰레기의 당화를 위하여 carbohydrase와 glucoamylase 효소를 이용한 결과 carbohydrase가 glucoamylase보다 당화효율이 우수하였으며, carbohydrase 이용시 건조 음식물쓰레기 기준 glucose 생산량 0.63g/g-TS을 얻을 수 있었다. 에탄올 생산은 동시당화발효에서 0.44g/L·hr, 분리당화발효가 0.27g/L·hr이었다. In the present study, bioethanol was produced using batch style reactor from food wastes which has organic characteristics. Pretreatment was required to reduce its particle size and produce fermentable sugar. Two different enzymes such as carbohydrase and gulcoamylase were tested for saccharification of food waste. The efficiency of carbohydrase saccharification (0.63g/g-TS) has shown higher than glucoamylase saccharification(0.42g/g-TS). Saccharomyces cerevisiae produced bioethanol via separate hydrolysis & fermentation (SHF) method and simultaneous saccharification fermentation (SSF) method. The production amount of bioethanol was 0.27 g/L·hr for SHF and 0.44 g/L·hr for SSF.
EMI 센싱 기법을 이용한 잔골재 혼합비에 따른 모르타르의 응결특성
이준철 ( Lee Jun-cheol ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
The electro-mechanical impedance(EMI) behavior of piezoelectric sensor embedded in cement mortar was investigated to assess the setting times. EMI signal was continuously measured for 12 hours by the PZT sensor embedded in cement mortar with different ratio of sand. As a result, the setting times by the penetration resistance test were accelerated as the sand ratio increased. However, the setting times by EMI sensing technique were delayed as the sand ratio increased.
망간 도핑 이산화티탄 나노와이어를 혼입한 시멘트 모르타르의 특성
이준철 ( Lee Jun-cheol ),호우야오롱 ( Hou Yao-long ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
The properties of cement mortar mixed with manganese-doped titanium dioxide nanowires (TiO<sub>2</sub>(Mn)-NWs) were investigated in this study. The TiO<sub>2</sub>(Mn)-NWs were synthesized using solvo-thermal synthesis and electro-spinning techniques. The TiO<sub>2</sub>(Mn)-NWs at weights of 1%, 2%, and 3% of the cement were respectively mixed into the cement mortar. The results showed that as the amount of TiO<sub>2</sub>(Mn)-NWs increased, the flow value of the cement mortar was decreased and the setting time of cement mortar was accelerated. Moreover, as the amount of TiO<sub>2</sub>(Mn)-NWs increased, the compressive strength of cement mortar was increased and the efficiency of acetaldehyde removal was improved.
이준철(J.C Lee),최기한(K.H Choi),이정원(J.W Lee),김승호(S.H Kim) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.1
3차원 비디오는 차세대 정보통신 서비스 분야의 핵심 기술로써 사용자에게 양질의 서비스를 제공하기 위한 미래 기술이며, 여러 개의 시점으로 구성되는 다시점 비디오는 고화질의 개념을 뛰어 넘어 더욱 사실감 넘치는 영상을 제공하며 사용자에게 미디어에 대한 실제감과 몰입감을 느끼게 한다. 본 논문에서는 입력 영상인 MP4파일 구조를 분석하고, MPEG을 기반으로 하는 다시점 비디오를 구현하는 방법을 제안한다.