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방병렬(Byeong-Ryeol Bang),류시은(Si-Eun Ryu),이은도(Uen-Do Lee),이태원(Tae-Won Lee),유한일(Han-il Yu),최문봉(Bong-Moon Choi),송선주(Sun-Ju Song) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
In this study, oxy-combustion system using Ion Transport Membrane (ITM) was investigated. The membrane material was developed for separating oxygen from air and the performance of the membrane material was investigated in terms of working temperature, membrane thickness and conditions of sweep side. Oxygen permeation flux is highly affected by membrane temperature ,thickness and partial pressure of oxygen boundaring membrane. The membrane material is composed of barium, cobalt, iron, niobium and oxygen. To apply the membrane to the real combustion system alumina supporter was developed and the effect of surface on the coating of the membrane was studied. In addition, oxy-combustion system with the membrane was design and some preliminary result will be presented in the workshop.
반응표면분석법(RSM)을 이용한 두릅의 유용성분 환류추출공정의 최적화
조정석 ( Jeong Seok Cho ),정제석 ( Jae Seok Jeong ),류시은 ( Si Eun Ryu ),이미현 ( Mi Hyun Lee ),최용희 ( Yong Hee Choi ) 한국산업식품공학회 2012 산업 식품공학 Vol.16 No.1
Response surface methodology (RSM) was used to monitor the characteristics of a return current extracts from Aralia elata. A central composite design was used to investigate the effects of the independent variables of extraction time (X1), ethanol concentration (X2) and extraction temperature (X3) on the dependent variables yield (Y1), total phenolics (Y2), electron donating ability (Y3), browning color (Y4) and reducing sugar contents (Y5) of extracts. The maximum yield was at 316.58 min (X1), 15.68% (X2) and 93.49oC (X3) in saddle point. Total phenolics were highly affected by ethanol concentration. The maximum total phenolics were at 94.78oC (X1), 22.9% (X2), 323.05 min (X3) in saddle point. The maximum electron donating ability was at 94.78oC (X1), 29.82% (X2), 323.05 min (X3) and was highly affected by ethanol concentration. The maximum browning color was at 97.00oC (X1), 38.35% (X2), 321.82 min (X3). The browning color was highly affected by ethanol concentration. The ruducing sugar content was at 97.00oC, 38.35%, When the extraction temperature, ethanol concentration, and extraction time were 87.62oC (X1), 24.62% (X2), 339.39 min (X3). The optimal conditions of extraction conditions for response variables by superimposing of contour maps were 263.5 min (X1), 14% (X2) and 89.5oC (X3).