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생물정보학적 접근을 통한 Caenorhabditis elegans 모델시스템의 생체내 RNAi 기능예측 및 비특이적 공동발현억제 현상 분석
김태호(Taeho Kim),김의용(Euiyong Kim),주현(Hyun Joo) 한국생물공학회 2011 KSBB Journal Vol.26 No.2
Some computational approaches are needed for clarifying RNAi sequences, because it takes much time and endeavor that almost of RNAi sequences are verified by experimental data. Incorrectness of RNAi mechanism and other unaware factors in organism system are frequently faced with questions regarding potential use of RNAi as therapeutic applications. Our massive parallelized pair alignment scoring between dsRNA in Genebank and expressed sequence tags (ESTs) in Caenorhabditis elegans Genome Sequencing Projects revealed that this provides a useful tool for the prediction of RNAi induced cosuppression details for practical use. This pair alignment scoring method using high performance computing exhibited some possibility that numerous unwanted gene silencing and cosuppression exist even at high matching scores each other. The classifying the relative higher matching score of them based on GO (Gene Ontology) system could present mapping dsRNA of C. elegans and functional roles in an applied system. Our prediction also exhibited that more than 78% of the predicted co-suppressible genes are located in the ribosomal spot of C. elegans.
차량 내 미생물에 의해 생성되는 악취유발 화학물질의 분석
박상준(SangJun Park),김의용(EuiYong Kim) 한국생물공학회 2014 KSBB Journal Vol.29 No.2
It was confirmed that malodor connected with an air-conditioner in an automobile is caused by microbial volatile organic compounds (MVOCs) produced by microorganisms getting into an air-conditioner when it is operating. Chemicals such as hydrogen sulfide, dimethyl sulfide, nbutyric acid, n-valeric acid, iso-valeric acid, n-octanol and toluene were detected above the odor threshold inside the automobile. The characteristics of a funky odor in the air blown into the automobile were due to detected sulfur compounds (hydrogen sulfide and dimethyl sulfide). Dimethyl sulfide was produced by microorganisms such as Aspergillus versicolor, Methylobacterium aquaticum, Herbaspirillum sp. and Acidovorax sp. In addition, the characteristics of a sour odor in the air blown into the automobile were due to detected organic acids (n-butyric acid, n-valeric acid and iso-valeric acid). N-valeric acid and iso-valeric acid were generated from Aspergillus versicolor, while iso-valeric acid was produced by Methylobacterium aquaticum. In addition, the odor intensity of the air blown into the automobile was affected by the concentration of detected sulfur compounds and organic acids. On the other hand, it is estimated that chemicals such as hydrogen sulfide, n-octanol and n-butyric acid detected in the air blown into the automobile were produced by non-identified species of microorganisms.
Hot Gas와 Cold Gas를 이용한 모사 이중펄스 로켓 추진기관의 내부 유동 특성
조기홍(Kihong Cho),박정호(Jungho Park),김의용(Euiyong Kim) 한국추진공학회 2015 한국추진공학회지 Vol.19 No.2
Dual pulse rocket motor is a variant of solid rocket motor with two propellant grain separated by a pulse separation device. The major performance of such a rocket motor is influenced by the change in the hole area of pulse separation device to nozzle throat area ratio. In this study, we performed flow analysis to investigate the internal flow characteristics according to the pulse separation device hole area to nozzle throat area ratio change. Gases used flow analysis were used combustion gas of HTPB/AP composite propellant and nitrogen gas. Flow analysis results of the dual pulse rocket motor were validated by comparison with experimental results of pneumatics. Commercial CFD code ANSYS FLUENT 14.5 is used in this study to simulate flow analysis.
KSLV-II 단분리용 역추진모터 설계 및 개발 현황(I)
임지환(Jihwan Lim),이관주(Gwan Joo Lee),김한준(Hanjoon Kim),이동원(Dongwon Lee),박의용(Euiyong Park),조인현(In-Hyun Cho),한상엽(Sang-Yeop Han) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.5
KSLV-II(한국형발사체)는 3단형 로켓으로, 각 단이 분리될 때, 분리되는 아랫단의 큰 관성에 의한 충돌 등의 원인으로 인해 우주발사체가 단분리 임무에 실패하는 것을 방지하기 위해서 반대 방향으로 추력을 발생시키는데 역추진모터를 사용한다. 역추진모터에서 연소관은 Ti 합금을 사용하여 구조 계수를 낮췄고, 제한된 노즐 팽창비 조건에서 상대적으로 추력을 높이기 위한 추진제 조성 개발과 그레인 설계가 수행되었다. 한편, 노즐 화염으로 인한 상단 동체 손상을 방지하기 위해 경사형 노즐을 적용하였다. 개발된 추진제 조성과 편향된 노즐 화염을 고려하여 노즐이 설계되었고 다량의 입자상 물질의 큰 관성에 의한 삭마를 고려하여 내열 소재를 선정하였다. KSLV-II(Korea Space Launch Vehicle-II) is a three-stage rocket. During the separation stage, in order to prevent the mission failure due to the collision of stages, the main fuselage of KSLV-II use the retro motors which generates the thrust toward the opposite direction of its orbit. Ti-6Al-4V alloy is used as the material of the combustion chamber of the retro motor which also contributes in lowering the structural coefficient. The nozzle of retro motor has a canted type to prevent from damages due to the flame of the nozzle.
다양한 오리피스를 이용한 연결형 공압 챔버 내부 유동 해석
조기홍(Kihong Cho),박정호(Jungho Park),김의용(Euiyong Kim) 한국추진공학회 2014 한국추진공학회지 Vol.18 No.1
Hydraulic dual chamber, as the simulator for a dual pulse rocket motor, was tested by a high pressure device with various orifice-hole size being applied. Pressure difference occurs between 1st chamber and 2nd chamber depending on area ratio of the orifice to nozzle throat. Studying a design configuration of the orifice is essential to the motor development because pressure difference severely affects the rocket motor performance. It is noticed in this study that energy dissipation is caused by the vortex flow originating from the orifice as the 2nd chamber is operated. The flow field is simulated by a commercial computational fluid dynamics program, ANSYS FLUENT V14.5.
오지성(Jisung Oh),이관주(Gwan Joo Lee),김수정(Sujeong Kim),김한준(Hanjoon Kim),박의용(Euiyong Park),권혁호(Hyukho Kwon),조인현(In-Hyun Cho) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
KSLV-II 가속모터는 한국형발사체에 사용하는 단분리모터의 한 종류이며 역추진모터와 동시에 작동하여 단분리를 수행한다. 가속모터의 목표 성능에 맞는 내탄도 설계, 추진제 조성 적용, 연소관 및 경사형 노즐 설계를 수행하였다. 연소관 및 노즐의 소재로 티타늄 합금을 적용하였으며 알루미늄이 다량 함유된 추진제에 대한 내열 성능 확보를 위한 노즐 내열재 소재를 선정하였다. 지상연소시험을 수행하여 KSLV-II 요구조건에 맞는 가속모터의 연소 성능을 확보하였다. KSLV-II ullage motor is a type of the separation motor of Korea Space Launch Vehicle. Simultaneously operates with the retro Motor to perform the stage separation. The internal ballistics design, application of propellant composition, and the design of the combustion chamber and the canted nozzle were performed in accordance with the target performance of the ullage motor. Ti-6Al-4V alloy was applied to the combustion as material of chamber and nozzle. The heat resistant material of the nozzle was selected to ensure the heat resistance of the propellant containing a large amount of aluminum. And the combustion performance of the ullage motor satisfying the KSLV-II requirements was secured by performing the ground combustion test.