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혼합폐기물 및 폴리우레탄 담체를 충전한 연속회분식공정을 이용한 생물학적 수소생산
이정열 ( Jung Yeol Lee ),위대현 ( Daeh Yun Wee ),조경숙 ( Kyung Suk Cho ) 한국미생물생명공학회(구 한국산업미생물학회) 2014 한국미생물·생명공학회지 Vol.42 No.3
This study investigated the effects of polyurethane foam on continuous hydrogen production from mixed wastes. Molasses was co-fermented with non-pretreated sewage sludge in a sequencing batch reactor. The results indicated that the addition of polyurethane foams as a microbial carrier in the reactor mitigated biomass loss at HRT 12 h, while most of the biomass was washed out during the operation period with no carrier. There was a stable hydrogen production rate of 0.4 L-H2/l/d in the carrier- sequencing batch reactor. Suspended biomass in the carrier-reactor indicated it possessed the highest specific hydrogen production rate (241 ± 4 ml-H2/g VSS/d) when compared to that of biomass on the surface (133 ± 10 ml-H2/g VSS/d) or inner carrier (95 ± 14 ml-H2/g VSS/d).
이정열 ( Jung Yeol Lee ),( Xue Jiao Chen ),민경석 ( Kyung Sok Min ) 한국물환경학회 2011 한국물환경학회지 Vol.27 No.6
Among various techniques for hydrogen production from organic wastewater, a dark fermentation is considered to be the most feasible process due to the rapid hydrogen production rate. However, the main drawback of it is the low hydrogen production yield due to intermediate products such as organic acids. To improve the hydrogen production yield, a co-culture system of dark and photo fermentation bacteria was applied to this research. The maximum specific growth rate of R. sphaeroides was determined to be 2.93 h-1 when acetic acid was used as a carbon source. It was quite high compared to that of using a mixture of volatile fatty acids (VFAs). Acetic acid was the most attractive to the cell growth of R. sphaeroides, however, not less efficient in the hydrogen production. In the co-culture system with glucose, hydrogen could be steadily produced without any lag-phase. There were distinguishable inflection points in the accumulation of hydrogen production graph that resulted from the dynamic production of VFAs or consumption of it by the interaction between the dark and photo fermentation bacteria. Lastly, the hydrogen production rate of a repeated fed-batch run was 15.9 mL-H2/L/h, which was achievable in the sustainable hydrogen production.
재난 지역 Wi-Fi Hot Spot 제공을 위한 UAV 탑재용 무선 통신장비 설계 시 고려사항에 대한 연구
이정열(Jung-Yeol Lee),김성택(Sung-Taek Kim),서보필(Bo-Pil Seo),진선후(Seon-Hu Jin),박창수(Chang-Soo Park) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.11
Recently, due to natural disasters such as flood, earthquake, tsunami, fire, and forest fire, etc., the destruction of the existing network infrastructure has caused situation that what happen in disaster area. To solve this case, we need to research to establish a wireless communication network using the communication equipment mounted on UAV (Unmanned Aerial Vehicle). In this paper, we present the integration method of wireless communication equipments through the research of the design and development of UAV mounted communication equipment.