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차세대 군용전원용 500W급 마이크로 터빈 발전기 시스템 설계
최상규,최범석,한용식,우병철,송인혁,민성기,임진식,Choi, Sang-Kyu,Choi, Bum-Suk,Han, Yong-Shik,Woo, Byung-Chul,Song, In-Hyuck,Min, Seong-Ki,Lim, Jin-Sik 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.6
Recent developments of small-size unmanned or manned mobile systems such as autonomous robots, exoskeleton or armored suits, micro air vehicles, and unmanned armored vehicles require long-lasting independent power sources of high energy and power density to support the systems' operation for up to 72 hours in the fields. Chemical batteries such as Ni-MH, Li-Ion, the current primary power sources for mobile devices, however, are not capable of providing enough power and energy density for the next generation high power mobile machines. For this reason, KIMM along with KERI and KIMS has been carrying out a 500W MTG development project under the DAPA's "Next generation military power source R&D program" since 2009. In this paper, a design process for a 500W MTG system currently being developed at KIMM is briefly described and the technical issues related to its development are addressed.
재활용 산화철 및 알루미늄 분말을 활용한 철도레일 이음용 테르밋 분말 개발
최상규,박성상,백응률,Choi, Sang-Kyu,Park, Sung-Sang,Baek, Eung-Ryul 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.5
Nowadays in Republic of Korea, whole amount of the thermite welding powder for rail joinning is dependent on import. However the demand of the thermite welding powder would be enlarge because some constructing high-speed train and city metro projects are currently in progress. In addition this is the main reason why we should develop the thermite welding powder, domestically. This study is focused on utilizing the recyclable materials like Al powders from cans and iron oxide scales from wire rods as the main components of the thermite welding powder. By minimizing Al content in weld zone by controlling the mixing ratio of the Al powder in the thermite welding powder, the excessive dissolution of the Si and Mn components came from the Al powders could be controled. The tensile strength of welding zone in welded rail was 740 MPa, with that the developed thermite welding powder.
관 유동과 Blasius 유동에서 가장 불안정한 교란에 관하여
최상규,정명균,Choi, Sang-Kyu,Chung, Myung-Kyoon 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.6
The pseudospectral method for stability analysis was used to find the most influential disturbance mode for transition of plane channel flows and Blasius flow at their critical Reynolds numbers. A number of various oblique disturbance waves were investigated for their pseudospectra and resolvent norm contours in each flow, and an exhaustive search method was employed to find the disturbing waves to which the flows become most unstable. In plane Poiseuille flow an oblique disturbance with a wavelength of 3.59h (where h is the half channel width) at an angle $28.7^{\circ}$ was found to be the most influential for the flow transition to turbulence, and in plane Couette flow it is an oblique wave with a wavelength of 3.49h at an angle of $19.4^{\circ}$. But in Blasius flow it was found that the most influential mode is a normal wave with a wavelength of $3.44{\delta}_{999}$. These results imply that the most influential disturbance mode is closely related to the fundamental acoustic wave with a certain shear sheltering in the respective flow geometry.
한국안 집단의 적혈구효소 Phosphoglucomutase-l (PGM1) 아형 검사에 관한 연구
최상규 ( Sang Kyu Choi ),이영애 ( Young Ae Lee ),김문규 ( Moon Kyoo Kim ) 대한임상검사과학회 1985 대한임상검사과학회지(KJCLS) Vol.17 No.1
The technique of isoelectric focusing on polyacrylamide gel plates was used to confirm the presence of four alleles of PGM, in human red cell lysates. The subtypes of PGM, were determined on samples from 235 unrelated individuals from Seoul, Korea. Ten different phenotypes are considered as gene products of four alleles at PGM 1 with the following frequencies: FGM1F, 0.6806; PGM1S, 0.0894; PGM2F , 0.1668; and PGM2S, 0.0632.
파일럿 규모 버너에서 커피찌꺼기 바이오원유 및 폐스티로폼 열분해오일 혼합연료의 연소특성
최상규 ( Sang-kyu Choi ),최연석 ( Yeon-seok Choi ),정연우 ( Yeon-woo Jeong ),한소영 ( So-young Han ),응웬반꾸잉 ( Quynh Van Nguyen ) 한국폐기물자원순환학회(구 한국폐기물학회) 2020 한국폐기물자원순환학회지 Vol.37 No.8
The combustion characteristics of mixed fuels, consisting of bio-crude oil from coffee grounds and pyrolysis oil from polystyrene foam waste, were studied in a pilot-scale burner, along with blends of pyrolysis oil from polystyrene foam waste and kerosene. The used burner system was previously developed for bio-crude oil combustion; thus, it was equipped with an air-blast atomizing nozzle and adopted downward injection. The mixture of bio-crude oil from coffee grounds and kerosene exhibited a distinct phase separation and could not be placed into the burner directly. The bio-crude oil was heated before being supplied to the fuel nozzle due to its high viscosity, while the blends of pyrolysis oil from polystyrene foam waste did not require preheating because they were less viscous. Under atmospheric conditions, the pyrolysis oil from polystyrene foam waste was blended at least 50% to prevent incomplete combustion. The blends of bio-crude oil from coffee grounds and pyrolysis oil from polystyrene foam waste emitted relatively more NO due to the fuel-bound nitrogen in bio-crude oil. When kerosene was mixed with the pyrolysis oil from polystyrene foam waste, the flame temperature generally increased while the CO emission initially increased drastically and then decreased. The NO emission decreased with the kerosene mixing ratio, which might be attributed to the combined effect of fuel-bound nitrogen and other NO formation mechanisms.