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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.
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.
대향류 예혼합화염의 소염 메커니즘에 관한 수치해석적 연구
최상규(Sang-Kyu Choi),조은성(Eun-Seong Cho),정석호(Suk-Ho Chung) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
The extinction mechanisms of premixed flames are investigated numerically. A symmetric double premixed flame in a counterflow configuration is adopted as a model problem, and a local equilibrium temperature is used as a measure of energy loss or gain in order to quantify the extinction mechanism caused by preferential diffusion and incomplete reaction due to the stretch rate for CH₄, H₂, C₃H?, CO, CH₄+H₂, and CO+H₂ premixed flames. The energy loss ratios from preferential diffusion and incomplete reaction were calculated at various equivalence ratios near flame extinction. The Lewis number is responsible for these two distinct modes of flame extinction. Results show that the extinction of lean CH₄, H₂, CH₄+H₂, CO+H₂, and rich C3H? premixed flames results from incomplete reaction due to the insufficient reaction time, implying that the Lewis number is smaller than unity. On the contrary, rich CH₄, H₂, CH₄+H₂, CO+H₂, and lean C₃H? premixed flames are affected by the combined effects of preferential diffusion and incomplete reaction, which indicates that the Lewis number is larger than unity. In CO premixed flames, incomplete reaction was dominant in both lean and rich cases. The extinction mechanisms could be quantified by the local equilibrium temperature, and the effective Lewis numbers were assumed indirectly.
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.
도시재생측면에서 관광축제의 영향인식에 관한 연구: 광주 추억의 7080 충장축제를 중심으로
최상규 ( Choi Sang-kyu ),임명재 ( Lim Myung-jae ),정강환 ( Jung Kang-hwan ) 한국관광산업학회 2017 Tourism Research Vol.42 No.1
연구에서는 도시재생의 다양한 연구 분야 가운데 소프트웨어를 활용한 도시재생기법 중,`축제`에 집중하여 문화관광축제의 도시재생 영향인식과 주민지지에 관한 연구를 했다. 본 연구에서는 총 2개의 가설을 검증하였다. 첫째는 문화관광축제의 도시재생 영향인식의 요인 중 경제·물리적 재생효과를 제외한 상권역량 재생효과, 사회·문화적 재생효과, 계층적 편견 회복효과는 통계적 유의수준 하에서 지역재생 주민지지에 유의한 영향을 미치는 것으로 나타났다. 둘째는 인구통계학적인 특성에 따른 지역재생 영향인식에 대한 차이를 검토하였다. 분석결과 상권역량 재생효과는 혼인여부, 직업, 학력에 따라 차이가 나타났으며, 경제·물리적 재생효과는 직업에 따른 차이가 검토되었다. 사회·문화적 재생효과는 거주기간, 거주지역, 직업, 학력에 따라 차이가 나타났으며, 계층적 편견 회복효과는 직업에 따른 차이가 검토되었다. 본 연구의 주제는 관광분야에서 새롭게 주목을 받고 있으나 아직 미개척 분야인 축제와 도시재생 영향인식에 관하여 이론적 연구와 실증적으로 접근하였다는데 의의가 있다 This study is focusing on `festival` and impacts perception, and citizen support, which are utilized software under various research of urban regeneration. This study verified two hypothesis: First, facts of impacts perception to the tourism festival on urban regeneration. Among the facts, commercial capability, social and cultural prejudice recovery effect, and hierarchical recovery effect excluding economic and physical regeneration are influencing on citizen support attentively, under statistical significance level. Second, distinction about influence recognition on urban regeneration under demographic characteristic. The result came out that regeneration effect of commercial capability has difference caused by martial status, occupation, academic ability. Also, economic and physical regeneration has difference caused by occupation. Moreover, social and cultural regeneration differed by residential duration, residential area, occupation, and academic ability. Lastly, hierarchical recovery effect is differed by occupation. The subject of this study is receiving new attention. However, it is more meaningful that this study is approaching with substantial and theatrical research to verify unexplored field, festival and urban regeneration.