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Pulse Power를 이용한 폐활성슬러지 전처리의 파이럿 규모 연구
유희찬,홍승모,최한나 유기성자원학회 2005 유기물자원화 Vol.13 No.3
Anaerobic digestion is employed worldwide as the oldest and most important process for sludge stabilization. An additional advantage is the production of methane during anaerobic digestion. However, the waste activated sludge(WAS) has poor anaerobic degradability and less gas production due to the cell wall of bio-solid. In order to improve and enhance stabilization and dewatering of the WAS, a number of pretreatment processes have been developed and investigated. In this research, a pilot-scale study of pulse power pretreatment was performed to improve anaerobic degradability and dewaterability of the WAS. A pilot plant was designed and operated based on a previous laboratory study. Change of the sludge characteristics by pulse power pretreatment was estimated to assess the increasing soluble organics. The increased soluble organics could be used as a good substrate in the anaerobic digesion process. Gas production and methane potential of the anaerobic digestion were estimated as the parameters of anaerobic degradability. For evaluation of the dewaterability of pretreated WAS, capillary suction time(CST) and specific resistance were measured. The efficiency of energy recovery was also estimated by calculating energy balance. 슬러지를 안정화시키기 위하여 가장 많이 적용되고 있는 공법은 혐기성 소화공법이라고 할 수 있다. 또한, 혐기성 소화는 유기성분의 효과적인 안정화와 동시에 메탄가스를 발생시켜 에너지로 이용 가능하다는 장점을 가지고 있다. 그러나, 폐활성슬러지의 경우 미생물의 세포벽 때문에 일반적으로 저조한 혐기성 처리효율과 탈수능을 나타내고 있으며, 이러한 문제점을 해결하기 위하여 많은 전처리공정들이 개발되거나 연구되어 왔다. 본 연구에서는 폐활성슬러지의 혐기성 소화효율과 탈수능을 향상시키기 위한 pulse power 전처리 연구를 pilot 규모로 수행하였다. Pilot plant는 기 수행된 실험실 연구결과를 바탕으로 설계 및 운전하였다. 본 연구에서는 pulse power 전처리에 의한 슬러지 특성변화를 평가하였으며, 특히 혐기성 소화시 미생물이 사용하기 용이한 기질의 증가를 의미하는 용존성 유기물질의 증가를 주요항목으로 평가하였다. 혐기성 소화조에서 발생하는 가스발생량과 메탄함량을 측정하여 혐기성 소화능을 평가하였으며, 슬러지 탈수능은 CST 및 비저항값의 측정을 통하여 평가하였다. 또한, 슬러지 처리공정에서의 전체적인 에너지수지를 계산하여 pulse power 전처리에 의한 에너지 회수율 변화를 평가하였다.
Glutamine reliance in cell metabolism
유희찬,Ya Chun Yu,성열승,한정민 생화학분자생물학회 2020 Experimental and molecular medicine Vol.52 No.-
As knowledge of cell metabolism has advanced, glutamine has been considered an important amino acid that supplies carbon and nitrogen to fuel biosynthesis. A recent study provided a new perspective on mitochondrial glutamine metabolism, offering mechanistic insights into metabolic adaptation during tumor hypoxia, the emergence of drug resistance, and glutaminolysis-induced metabolic reprogramming and presenting metabolic strategies to target glutamine metabolism in cancer cells. In this review, we introduce the various biosynthetic and bioenergetic roles of glutamine based on the compartmentalization of glutamine metabolism to explain why cells exhibit metabolic reliance on glutamine. Additionally, we examined whether glutamine derivatives contribute to epigenetic regulation associated with tumorigenesis. In addition, in discussing glutamine transporters, we propose a metabolic target for therapeutic intervention in cancer.
박철휘,유희찬 서울시립대학교 도시과학연구원 1998 도시과학논총 Vol.24 No.1
The objective of this study is to provide the guideline for process train and treatment conditions of leachate generated from municipal solid waste landfill. Based on the results of lab scale treatability test, a biological process composed of UASB and extended aeration and a chemical process composed of FeCl₃coagulation and fenton's oxidation processes are selected as the optimum treatment processes. Using this treatment process train, the bench scale experiments are performed and a pilot plant is operated at the metropolitan landfill site. According to the pilot plant operation results, the organics and ammonia contained in leachate generated from the municipal solid waste landfill site can be reduced to the regulation limits or less. The treatment process currently being operated in the metropolitan landfill is concluded to consume a lot of chemicals because the fenton process does not include coagulation process. Therefore, to reduce the chemical consumption which has been the major problem of leachate treatment process in metropolitan landfill, it is proposed that a coagulation process be installed prior to the fenton process and the sludge generated from the fenton process be reused as coagulant without any pretreatement.
입체ㆍ복합 프로젝트에서 지능형 종합사업관리 시스템(iPMIS)의 요구기능 구축방향
유희찬(Yu Hoe-Chan),김주형(Kim Ju-Hyung),이윤선(Lee Yoon-Sun),김재준(Kim Jae-Jun) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
As construction projects become larger and more complicated than before, sophisticated management techniques is essential for project success. Information systems and technology has been introduced to this end. Mega project is one of most complicated project type as public and private sectors involve and the space will be construed in all directions i.e. horizontal, vertical, underground and ground. This paper describes fundamental study to implement intelligent information systems to mange mega projects. The systems aim to provide information to users for acknowledging the status and thus enable them to make project decisions. This concept is called 'intelligent'