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( Sangyeop Shin ),( D. C. M. Kulatunga ),( S. H. S. Dananjaya ),( Chamilani Nikapitiya ),( Jehee Lee ),( Mahanama De Zoysa ) 한국균학회 2017 Mycobiology Vol.45 No.4
Saprolegniasis is one of the most devastating oomycete diseases in freshwater fish which is caused by species in the genus Saprolegnia including Saprolegnia parasitica. In this study, we isolated the strain of S. parasitica from diseased rainbow trout in Korea. Morphological and molecular based identification confirmed that isolated oomycete belongs to the member of S. parasitica, supported by its typical features including cotton-like mycelium, zoospores and phylogenetic analysis with internal transcribed spacer region. Pathogenicity of isolated S. parasitica was developed in embryo, juvenile, and adult zebrafish as a disease model. Host-pathogen interaction in adult zebrafish was investigated at transcriptional level. Upon infection with S. parasitica, pathogen/antigen recognition and signaling (TLR2, TLR4b, TLR5b, NOD1, and major histocompatibility complex class I), pro/anti-inflammatory cytokines (interleukin [IL]-1β, tumor necrosis factor α, IL-6, IL-8, interferon γ, IL-12, and IL-10), matrix metalloproteinase (MMP9 and MMP13), cell surface molecules (CD8<sup>+</sup> and CD4<sup>+</sup>) and antioxidant enzymes (superoxide dismutase, catalase) related genes were differentially modulated at 3- and 12-hr post infection. As an anti-Saprolegnia agent, plant based lawsone was applied to investigate on the susceptibility of S. parasitica showing the minimum inhibitory concentration and percentage inhibition of radial growth as 200 μg/mL and 31.8%, respectively. Moreover, natural lawsone changed the membrane permeability of S. parasitica mycelium and caused irreversible damage and disintegration to the cellular membranes of S. parasitica. Transcriptional responses of the genes of S. parasitica mycelium exposed to lawsone were altered, indicating that lawsone could be a potential anti-S. parasitica agent for controlling S. parasitica infection.
Jung Sangyeop,이재연,Lee Kyungeun,Cho Soyeon,Kim Byeongyoung,Shin Yeongseob,이규송,정연숙 한국식물학회 2023 Journal of Plant Biology Vol.66 No.1
The East Coast Fire in April 2000 was a recorded large-scale fre in Korea (23,794 ha) which caused a ferce debate over mandatory reforestation policy. The regeneration process of tree species at the stand and species level was tracked for 20 years by permanent plots according to burn severity and degree of initial regeneration in prefre Pinus densifora forests. Fire activated sprouting vigorously in the frst two years, forming single-cohort tree clump populations. The abundance of prefre resprouter trees and burn severity greatly infuenced the process. The high survival and fast growth of the initial clumps contributed to the stand development. Quercus mongolica was dominated with large clump size initially, while Quercus variabilis increased the dominance with a faster growth rate over time. Pinus densifora, obligate seeder, was established from about 8 years later only in the low-regenerating stands. After 20 years, the canopy of the prefre pine forests shifted and diverged to three types. Pinus stand was maintained at light-burn stands, while Quercus-dominated or Pinus–Quercus mixed stand was formed at severe-burn stands. The qualitative and quantitative characteristics of initial stands mostly persisted in stands for 20 years, suggesting a good predictor for the structural development of later stands. This provide good information for establishing a restoration policy in the early stage after fre.
Analysis of spray nozzle in 1-channel MQL (minimum quantity lubrication) systems
Juhye Shin,Axel Lefebure,Se Eun Kim,Doyeon Weon,Gwanghun Jeon,Yunseo Kang,Hajin Park,Jumi Lee,Deukgwi Lee,Changsu Lee,Yeongchang Park,Kyeongdong Kim,Sangyeop Lee,Dongha Shim 한국생산제조학회 2020 한국생산제조시스템학회 학술발표대회 논문집 Vol.2020 No.10
신동순(DongSun Shin),김경석(KyungSeok Kim),한상엽(SangYeop Kim),방정석(JeongSuk Bang),김현웅(HyenWoong Kim) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.12
터빈배기부 구성품중에서 열교환기의 역할은 헬륨가스를 개발규격에 명시된 온도까지 상승시켜산화제와 연료탱크의 얼리지 볼륨에 공급하여 일정하게 추진제를 엔진에 공급하는 역할을 한다. 열교환기는 엔진의 구성요소이며 연소가스의 열원을 이용하여 헬륨을 Rib 채널 및 튜브에 흘려보내어 필요한 출구온도를 생성한다. 발사체 개발 초기 단계에서 열교환기의 구조 및 성능 분석을 위하여 외국 발사체에 사용되는 열교환기의 자료를 수집하여 면밀하게 검토하였으며, 발사체 시스템의 요구조건을 만족시키기 위하여 몇 종류의 열교환기 형상 도출과 개념설계 및 열교환 면적 계산을 수차례에 걸쳐서 수행하였다. 위와 같은 몇 차례의 시도를 통하여 발사체에서 요구하는 열교환기의 길이와 직경 조건을 확정하여 개념 설계를 진행한 결과 산화제탱크 가압용 열교환기는 Rib 채널과 튜브를 혼합한 방식과 연료탱크용 열교환기는 2개의 나선형 튜브 방식으로 설계하였다. 본 논문에서는 추진제탱크 가압용 열교환기의 설계 접근기법과 구성 및 유량 분배 및 흐름에 대하여 간략하게 소개한다. The heat exchanger, which is a component of the turbine exhaust system, serves to raise the temperature of the helium gas to the temperature specified in the development standard and supply it to the oxidizer and the fuel tank so that the propellant is constantly supplied to the engine. In order to analyze the structure and performance of the heat exchanger at the early design stage, data of the heat exchanger used in foreign launch vehicle were collected and analyzed. In order to meet the requirements of the launch vehicle system, several types of heat exchanger shape, heat exchange area calculation was performed. In this paper, design approach, structure and fluid analysis of a heat exchanger for pressurizing the propellant tank are introduced.
신동순(Dongsun Shin),한상엽(SangYeop Han),조인현(Inhyun Cho) 한국추진공학회 2010 한국추진공학회 학술대회논문집 Vol.2010 No.11
추진제를 추진제 탱크에 충전하는 과정은 발사 준비 과정에서 중요한 역할을 하며, 추진제 충전량의 정확도는 발사체 전체 무게와 관련되어 있다. 발사체에 사용되는 추진제 중에는 액체산소와 같은 극저온 추진제도 사용되며, 극저온 추진제는 탱크 내의 환경에 따라 쉽게 액상에서 기상으로 변화된다. 따라서 추진제 탱크 내의 추진제 표면 주위에서 추진제 수위를 판별할 수 있는 액상과 기상의 경계면을 명확하게 파악 할 수 있는 수위 측정시스템이 필요하다. 본 연구에서는 정전용량형 3전극 원리를 이용한 측정시스템의 제작과정과 예비시험을 통하여 액체의 높이가 변화할 때 전기신호가 변화되는 것을 확인하였다. 시험 결과로부터 물의 높이 변화에 비례하게 전압이 선형적으로 증감하는 경향을 파악하였다. The processes of supplying propellants into propellant tanks play important roles during launch preparation of satellite launch vehicle. The total weight of launch vehicle greatly depends on the accuracy of filling quantity of propellant during launch preparation. Among propellants used for launch vehicles a cryogenic propellant such as liquid oxygen is widely adapted as an oxidizer for launch vehicles. Such cryogenic propellant usually resides in a propellant tank as two-phase fluid with liquid and gas, which needs an accurate level measurement system to detect the position of propellant surface precisely. In this paper the fabricating process of a level measurement system using capacitance type with three electrodes is analyzed. In addition, the change of electric signal according to the height of liquid is verified by testing the level measurement system under consideration. The results of tests shows as expected the linear trend of voltage according to the change of water height in a tank.
신동순(DongSun Shin),김병훈(Byung-Hun Kim),한상엽(SangYeop Han) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.11
터보펌프에서 발생 가능한 cavitation을 동반하지 않으면서 추진제를 요구하는 압력과 유량으로 연소기에 공급하기 위해서는 추진제 탱크에 저장된 추진제를 가압하는 시스템이 필요하다. 가압시스템은 선가압과 주가압으로 분류할 수 있으며, 본 연구에서는 주가압 시스템에 대해서만 언급한다. 추진제탱크 가압 방식에는 가압가스 생성방법과 공급 방법으로 나눌 수 있으며, 가압가스 생성방법으로는 비활성가스 및 극저온 산화제를 기화시켜 추진제탱크에 공급하는 방법이 있다. 본 연구에서는 가압시스템의 분류와 가압 방식에 따른 장단점을 비교하였으며, 특히 발사체에서 사용하고 있는 가압방식 중에서 임펄스 제어방식의 원리와 가압시스템의 특성을 기술한다. 또한 가압시스템의 구성요소인 열교환기의 형상과 구조 및 각 열교환기의 특징에 대하여 설명한다. 본 자료는 발사체 개발단계에서 가압시스템의 기본요구조건 도출과 개념설계 단계에서 활용할 수 있다. A system to pressurize propellants stored in propellant tanks is necessary to feed liquid-propellants into combustion devices at the required pressure and flowrate without having cavitation in turbo-pumps. A pressurization system can be categorized into pre-pressurization stage and main-pressurization stage. This report is regarding to a main-pressurization system. Pressurization methods for propellant tanks are divided into pressurant gas generating method and pressurant gas feeding method. One of pressurant gas generating methods uses the vaporized oxygen gas from cryogenic liquid oxygen and non-flammable gas. In this report, both advantages and disadvantages for pressurization methods and types of pressurization systems are compared. Especially the characteristics and principle of pressurization system using impulsive control strategy applied in launch vehicles are introduced. Additionally the structure, schematics, and specifications of heat exchanger, which is one of main units in pressurization system are also discussed. This paper can be utilized to generate the conceptual requirements and to design preliminary configuration of pressurization system during the development of launch vehicle.