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Explicit Knowledge of L2 Chunks and Chunking in English Learning and Use
정해승,김현주 한국중등영어교육학회 2010 중등영어교육 Vol.3 No.2
This present research was designed to explore how and to what extent explicit knowledge of L2 chunks and chunking, which have both grammatical and idiomatic information, would benefit English learning and use. The operation of an EFL learner's explicit L2 chunks and chunking knowledge has been qualitatively investigated over a 6-month period. Through ethnographic data collecting methods such as observations and interviews of the participant's process of acquiring L2 knowledge system, it was found that the awareness of explicit knowledge of English chunks and chunking significantly played an effective role in developing the English language system in terms of fluency, accuracy, and complexity. Based on the results of this study, the researchers suggest that the explicit and declarative knowledge become implicit and procedural knowledge through prolonged and systematic practices: the explicit knowledge of L2 chunks and chunking works positively for L2 learning and use.
Dual Swirl 인젝터의 분산각에 관한 해석적 연구
정해승,김선진 한국군사과학기술학회 2003 한국군사과학기술학회지 Vol.6 No.4
Numerical analysis of the spray angles of Dual swirl injector were investigated to obtain basic design data and to predict the combustion performance. Using the commercial thermal hydraulic program, discharge coefficients and spray angles were numerically analyzed with recess length, pressure drop, velocity ratio, mixture ratio and back hole length. Water was used as simulants for oxidizer and fuel, respectively to compare the experimental results. Swirl injectors were designed to inject oxidizer of 70.5g/s and fuel of 29.5g/s at the pressure drop of 1MPa and two recess lengths were considered. In addition, the effect of injector geometry coefficient and velocity ratio on the discharge coefficient was studied.
바이오플락과 유수식 시스템에서 메기(Silurus asotus) 배합사료내 단백질 함량에 따른 성장도 및 수질 비교 연구
정해승,박준성,김형수,이동길,황주애 한국수산과학회 2022 한국수산과학회지 Vol.55 No.5
Biofloc technology (BFT) systems provides an additional protein source for fish by converting waste in microbial flocs. Therefore, we aimed to determine the difference in the protein levels of the diet of Far Eastern catfish Silurus asotus reared in BFT and FW systems. We applied a two-way (six protein levels × two aquaculture systems) ANOVA design. We formulated six experimental diets to contain different protein levels (CPs)– 20%, 25%, 30%, 35%, 40% and 45%–referred to as the CP20, CP25, CP30, CP35, CP40 and CP45 diets, respectively. We randomly distributed 900 fish into 36 (18 each for BFT and FW), 300 L tanks (25 fish/tank) with three replications of each diet for 4 weeks. The weight gain (WG) and specific growth rate (SGR) considerably improved as the dietary protein level increased in the formulated diets. The BFT fish showed higher growth performance with any experimental diet than the FW fish. The growth performance of the fish fed the BFT-CP35 diet was higher than that of the fish fed the FW-CP45 diet. In conclusion, the cultivation of Far Eastern catfish (S. asotus) in BFTs can be carried out under reduced dietary protein levels.
정해승(Haeseung Jeong),황기영(Kiyoung Hwang),윤현걸(Hyungull Yoon) 한국추진공학회 2010 한국추진공학회 학술대회논문집 Vol.2010 No.11
막냉각은 고온의 연소가스에 장시간 노출되어 있는 공기흡입식 추진기관의 연소실 내벽을 열적으로 보호하기 위해 사용하고 있으며, 슬롯형 냉각라이너를 이용한 막냉각 방법은 냉각특성을 향상시키기 위해 오랫동안 연구되어 왔다. 본 논문에서는 다중 슬롯형 냉각라이너의 연소영역과 냉각영역에서의 기체역학적 유동 및 열전달 계산에 대한 연구결과를 기술하였다. Film cooling is used to protect thermally the inner wall of combustion chamber exposed to hot gas in air-breathing propulsion system and specially film cooling using slotted cooling liner has been investigated to improve the cooling characteristics for a long time. In this paper results from gas dynamic and heat transfer calculations were presented in the combustion area and cooling area of multi-slotted cooling liner.
정해승(Haeseung Jeong),최호진(Hojin Choi),홍윤기(Yunky Hong),문관호(Gwanho Moon),이정섭(Jeongsub Lee) 한국추진공학회 2020 한국추진공학회 학술대회논문집 Vol.2020 No.11
본 연구는 초음속 연소기용 연료분사장치의 내열특성을 확인하기 위해 고온 환경에서 많이 사용되고 있는 고강도 소재를 이용하여, 먼저 디스크 타입의 열차폐 코팅 시편을 통해 열차폐 코팅과 모재간의 접합강도, 열충격 시험 및 미세조직 분석을 수행하였고, 3-D 프린팅 제작기술을 이용하여 Hypermixer 형태의 연료분사장치를 제작하였고, 여기에 열차폐 코팅(Thermal Barrier Coating)하여 고온 풍동시험을 통해 열차폐 코팅의 유무에 따른 내열특성을 살펴보았다. In this research, Nickel-based alloy was considered as fuel injectors for supersonic combustor. For disk-typed test specimen with heat-protecting thermal barrier coating, joint strength tests between base and coating material, thermal cycling tests, and micro structure analysis were performed. Hypermixer-typed fuel injectors were manufactured using 3-D print technique. Thermal barrier coating were applied to the hypermixer-typed fuel injectors. Heat-protecting characteristics tests were performed for test specimen with or without thermal barrier coating using high-temperature wind tunnel tests.
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