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정해승(Hae Seung Jeong),윤현걸(Hyun Gull Youn) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.11
본 연구는 공기흡입식 추진기관을 위한 슬롯형 냉각라이너의 설계변수가 냉각성능에 미치는 영향을 살펴보기 위한 것이다. 슬롯형 냉각라이너의 설계변수 세가지를 선정하여 냉각성능에 미치는 영향을 분석하였다. 본 논문에서는 슬롯형 냉각라이너의 각 설계변수에 대한 열전달 계산으로부터 얻어진 내벽온도 계산결과를 비교하였다. This study aims to analyze the effects of design parameters of the slotted cooling liner for air-breathing propulsion system. The three kinds of design parameters of the slotted cooling liner were selected and were investigated effect on the cooling performance of the slotted cooling liner. In this paper calculation results for inner wall temperature of cooling liner from heat transfer calculations were presented
김선진,정해승,Kim, Sun-Jin,Jeong, Hae-Seung 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.1
Experiments on film cooling were performed with a small scale rocket engine homing liquid oxygen (LOx) and Jet A-1(jet engine fuel). Film coolants(Jet A-1 and water) were injected through the film cooling injector. Film cooled length and the outside wall temperature of the combustor were determined for chamber pressure, and the different geometries(injection angle) with the flow rates of film coolant. The loss of characteristic velocity due to film cooling was determined for the case of film cooling with water and Jet A-1. As the coolant flow increases, the outside wall temperatures decrease but the decrease in the outside wall temperatures reduced over the 8 percent film coolant flow rate. The efficiency of characteristic velocity was decreased with the Increase of the film coolant flow rate.
기술·경제·환경적 측면에서의 스마트양식 산업화 모델과 기술개발 방향
이동길 ( Donggil Lee ),정해승 ( Hae Seung Jeong ),서준혁 ( Junhyuk Seo ),김형수 ( Hyeong Su Kim ),박정환 ( Jeonghwan Park ) 한국수산과학회 2023 한국수산과학회지 Vol.56 No.6
Owing to the increase in the elderly population at aquaculture farm and decrease in the number of aquaculture farm-ers, the need to improve aquaculture production system is increasing. In addition, asvirtual interactions become new normal after COVID-19 pandemic, the speed at which science and technology such as the internet of things (IoT), information and communications technology (ICT), and artificial intelligence (AI) are applied to each field is accel-erating. Efforts are being made to enhance the quality of life of aquaculture farmer and competitiveness of the aqua-culture industry by incorporating digital technology. This study analyzed national and global aquaculture technology development and policy trends, smart aquaculture terminology application scenarios, and prior research cases to propose smart aquaculture industrialization models and technology development directions considering technology, economy, and environment. This study can also provide valuable reference for promoting smart and efficient devel-opment of aquaculture.
최영환(Young-Hwan Choi),정해승(Hae-Seung Jeong),김유(Yoo Kim),김선진(Sun-jin Kim) 한국항공우주학회 2005 韓國航空宇宙學會誌 Vol.33 No.6
추진제로 LOX/kerosene를 사용하는 소형 액체로켓 엔진의 노즐에서 막냉각의 영향을 살펴보고자 물을 냉각제로 사용하여 로켓엔진의 노즐을 막냉각 시켰다. 막냉각제를 추력실로 흘려보내기 위한 막냉각장치를 제작하였으며, 막냉각제의 공급유량은 전체 추진제 공급 유량의 약 15~19% 하였다. 노즐의 열유속은 냉각제(물)의 온도상승과 유량을 측정하여 구하였다. 측정결과 노즐의 입구에서 막냉각제를 직접 분사시켰을 때, 노즐에서의 열 유속은 크게 감소하였다. An experimental study was carried out to investigate the effect of film cooling in the lab-scale dump-cooled liquid rocket engine using LOX and kerosene as propellants. The nozzle of the rocket engine was film cooled with water as coolant. A special film cooling adapter was fabricated to introduce the film-coolant into the thrust chamber. The flow rates of film coolant was approximately 15~19 percent of the total propellant. The nozzle heat flux was determined from the measured temperature rise and flow rate of the coolant(water). Large reductions in the nozzle heat flux was resulted when film cooling adapter located directly upstream of the nozzle.
까막전복(Haliotis discus) 치패용 EP사료내 어분과 해조류 대체원으로서 참치부산물분과 생미강의 효과
윤아영 ( Ahyeong Yun ),김준 ( June Kim ),정해승 ( Hae Seung Jeong ),이기욱 ( Ki Wook Lee ),조성환 ( Sung Hwoan Cho ) 한국수산과학회(구 한국수산학회) 2018 한국수산과학회지 Vol.51 No.4
We investigated the effect of replacing tuna byproduct meal (TBM) and rice bran (RB) with fish meal (FM) and macroalgae (MA) in extruded pellets (EP) supplied as a diet to juvenile Abalone Haliotis duscus in aquaculture. In total, 80,000 juvenile abalone were distributed among eight indoor raceways and supplied with one of four experimental diets. The control diet consisted of FM, fermented soybean meal, corn gluten meal and shrimp meal as protein sources, with wheat flour and dextrin as carbohydrate sources; the control diet also contained MA. In the FM50 diet, TBM was replaced with 50% FM. In the MA 50 diet, RB was replaced with 50% MA. The final diet, FM50+MA50, included TMB and RB in place of 50% FM and 50% MA. Abalone were fed to satiation with little food leftover for 16 weeks. Weight gain and specific growth rate of abalone fed the control diet were greater than those of abalone fed the FM50 and MA50 diets, but not different from those of abalone fed FM50+MA50 diet. The proximate composition of abalone soft body did not vary according to experimental diets. Based on these results, it appears that the traditional commercial diet for juvenile abalone, comprising FM and MA, could be replaced with one containing 50% TBM and 50% RB without any retardation of growth.