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Effect of Pressure Drop on Performance of Hollow - Fiber Membrane Module for Gas Permeation
Chang, Daejun,Min, Joonho,Oh, Sehern,Moon, Kiho 한국화학공학회 1998 Korean Journal of Chemical Engineering Vol.15 No.4
The pressure drop mainly due to viscous friction inside hollow fibers is taken into consideration by nondimensionalization and numerical simulation of governing equations. For pure gas, the permeation pressure and velocity of actual situations with a viscous fluid deviate significantly from those, of the corresponding inviscid or nopressure-drop cases. The apparent permeability estimated from the, relation of permeate flow rate and pressure difference is considerably underestimated in actual situations, and more severely for the region of small pressure difference and large module length. Numerical simulation shows that the estimated permeability behaves as if it were an increasing function of pressure difference tar a constant permeability and roughly a constant for a dual-sorption-type permeability, respectively. For binary-mixture permeation the cut ratio and purity of permeate stream are mainly governed by two dimensionless parameters standing for pressrue drop and permeability, respectively. The cut ratio and corresponding product composition are predictable without the rigorous simulation of the governing equations.
Catalytic copyrolysis of cork oak and bio-oil distillation residue
Lee, Yejin,Oh, Daejun,Kim, Young-Min,Jae, Jungho,Jung, Sang-Chul,Jeon, Jong-Ki,Kim, Sang Chai,Park, Young-Kwon Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.429 No.-
<P><B>Abstract</B></P> <P>The atmospheric distillation residue (ADR) of cork oak (CO) pyrolysis oil was used as the co-feeding material for the catalytic pyrolysis of CO over HZSM-5 catalysts to improve the formation of aromatic hydrocarbons. Although the non-catalytic copyrolysis of CO and ADR did not improve the formation of aromatic hydrocarbons, the catalytic copyrolysis of CO and ADR promoted the synergistic formation of aromatic hydrocarbons. HZSM-5(30), having a lower SiO<SUB>2</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>(30), showed better performance for the formation of aromatic hydrocarbons than HZSM-5(80) because of its higher acidity. The catalytic copyrolysis of CO and ADR also decreased the formation of coke. The largest quantity of aromatic hydrocarbons was obtained from the catalytic copyrolysis of CO and ADR over HZSM-5 (30) at 600°C, whereas the lowest coke yield was achieved at 700°C. When the catalyst to sample ratio was increased from 2:1 to 5:1, the synergistic formation of aromatic hydrocarbons was limited, resulting in a lower experimental yield of aromatic hydrocarbons than the theoretical yield. A lower coke yield was also achieved at a high catalyst to sample ratio (5:1).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Catalytic copyrolysis of cork oak and bio-oil distillation residue was performed. </LI> <LI> HZSM-5 was used as catalyst. </LI> <LI> Bio-oil distillation residue addition resulted in synergistic aromatic production. </LI> </UL> </P>
오학주(Hakjoo Oh),정영범(Youngbum Jung),진민식(Minsik Jin),김덕환(Deokhwan Kim),황의권(Yikwon Hwang),박대준(Daejun Park),이희종(Heejong Lee),공순호(Soonho Kong),이광근(Kwangkeun Yi) 한국정보과학회 2007 한국정보과학회 학술발표논문집 Vol.34 No.1C
Sparrow(스패로우)는 C/C++로 작성된 프로그램의 메모리 누수와 버퍼오버런 오류를 자동으로 프로그램 실행전에 찾아주는 도구이다. Sparrow는 실제 현장에서 쓰이는 상용 프로그램의 분석에 유용하게 쓰일 수 있도록 제작되었다. 이를 위해 분석기 엔진은 수십만 라인 이상의 소프트웨어를 적절한 시간과 정확도로 분석하기 할 수 있도록 많은 기술이 적용되었다. 또한 사용자의 편의성을 위해 대상 프로그램의 소스 구조를 자동으로 파악하여 분석을 준비하고, 거짓일 가능성이 높은 알람을 미리 제거하며, 발생한 알람의 원인을 설명해 준다. Sparrow로 httpd-2.2.2를 비롯한 오픈 소프트웨어들을 분석한 결과 실제 오류들을 찾아낼 수 있었다.
Rezaei, Pouya Sirous,Oh, Daejun,Hong, Yeojin,Kim, Young-Min,Jae, Jungho,Jung, Sang-Chul,Jeon, Jong-Ki,Park, Young-Kwon Pergamon 2017 Energy Conversion and Management Vol. No.
<P><B>Abstract</B></P> <P>Catalytic co-pyrolysis of biomass and hydrogen-rich materials is an effective approach for enhancing the production of bio-based hydrocarbons. In this work, mesoporous solid acid materials, such as hierarchical mesoporous MFI (meso MFI), hierarchical mesoporous Y (meso Y) and Al-SBA-15, were used as the catalysts for the catalytic co-pyrolysis of yellow poplar (YP) and high-density polyethylene (HDPE). Among three catalysts, meso MFI revealed the highest catalytic efficiency for the production of aromatic hydrocarbons from catalytic pyrolysis of YP or HDPE due to its effective pore structure, large channels, and high acidity. Moreover, meso MFI showed the highest synergistic formation of aromatic hydrocarbons during the catalytic co-pyrolysis of YP and HDPE as a result of hydrogen donating effect of HDPE and catalytic interactions between YP- and HDPE-derived pyrolyzates. The amounts of solid residue obtained from the catalytic co-pyrolysis of YP and HDPE over meso MFI were also much lower than their theoretical yields.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Meso-MFI catalyzed pyrolysis of yellow poplar gave high aromatic hydrocarbon yield. </LI> <LI> MFI pore structure, large pore size and strong acidity cause high aromatization. </LI> <LI> Significant synergy occurred between yellow poplar and HDPE over meso-MFI catalyst. </LI> <LI> Catalytic pyrolysis efficiency is a strong function of H/C<SUB>eff</SUB> ratio of feedstock. </LI> </UL> </P>
김현경(Hyungyung Kim),오영섭(Youngsup Oh),송대준(Daejun Song),오승택(Sengtaek Oh),김동학(Donghak Kim),이동열(Dongyul Lee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
A new point of view in vehicle bumper frame is proposed by Contacted 2 Pipes BUMPER STRUCTURE, which is a new development method based on the principle of hot-stamping, structural design, method of TRIZ and evaluations. As a result of the application of new bumper frame, this paper classifies Increased of strength to 1.8GPa, Shapes of Cold Coiled Thin Pipe, optimized structural design, and enhanced performance of RCAR, Towing and Shipping.