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전창수(Chang Soo Jeon) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.3 No.2
Numerical simulations on the flowfield of lifting chamber for Wing- In-Ground vehicle were performed using Fluent/UNS 4.2 software. The trend of lifting force in lifting chamber and parametric study of geometric and fluid variables were primarily investigated. Selected parameters for investigation are inlet velocity, height between chamber and water level, depth of the skirt, location of inlet, variation of height at bow and stern. Also, air capturing capabilities from downstream of the propeller were evaluated at the air inlet. The lifting force was increased linearly with the increase of inlet velocity and nonlinearly with the decrease of height between the chamber and water level. As for the variation in depth of the skirt, the lifting force was increased with increased depth. It turned out to have very minor effect on lifting force to change the location of air inlet for lifting chamber, installed on top surface. Tilting the vehicle when it was lifted, the lifting forces, generated in each case, showed no appreciable changes.
전창수,Jeon, Chang-Soo 한국전산유체공학회 1998 한국전산유체공학회지 Vol.3 No.2
Numerical simulations on the flowfield of lifting chamber for Wing-In-Ground vehicle were performed using Fluent/UNS 4.2 software. The trend of lifting force in lifting chamber and parametric study of geometric and fluid variables were primarily investigated. Selected parameters for investigation are inlet velocity, height between chamber and water level, depth of the skirt, location of inlet, variaton of height at bow and stern. Also, air capturing capabilities from downstream of the propeller were evaluated at the air inlet. The lifting force was increased linearly with the increased of inlet velocity and nonlinearly with the decrease of height force was increased with increased depth. It turned out to have very minor effect on lifting force to change the location of air inlet for lifting chamber, installed on top surface. Tilting the vehicle when it was lifted, the lifting forces, generated in each case, showed no appreciable changes.
색상 검출방식의 천이 액정법에서 색상 변화 시간 산정의 정확도 향상
신소민(Somin Shin),전창수(Chang Soo Jeon),곽재수(Jae Su Kwak),정용운(Yong Wun Jung) 대한기계학회 2007 大韓機械學會論文集B Vol.31 No.11
In this paper, different criteria for determining hue change time in the hue detection based transient liquid crystals technique were compared. Results showed that methods utilizing threshold of intensity or saturation gave many missing points and quality of the calculated results were strongly depends on the value of threshold. Wider bandwidth in the hue bandwidth method showed better distribution of calculated hue change time, but induced ambiguity in the hue change time. In the time-hue curve fitting method, the distribution of evaluated hue change time was smooth and reasonable, and, by the nature of curve fitting, the noise effect on the hue was successfully considered in calculating of the hue change time. Compared to other methods, it is expected that the time-hue curve fitting method would provide better and accurate hue change time in the hue detection based transient liquid crystals technique.
재제조(再製造) 산업(産業)의 활성화(活性化)를 위한 제도(制度)의 기본(基本) 원칙(原則)
목학수,박남규,전창수,송민준,한창효,Mok, Hak-Soo,Park, Namkyu,Jeon, Chang-Su,Song, Min-Jun,Han, Chang-Hyo 한국자원리싸이클링학회 2013 資源 리싸이클링 Vol.22 No.3
재제조 산업은 환경을 보존하면서 제조 시 사용되는 자원과 에너지를 줄일 수 있는 대안으로 알려지고 있다. 한국에서 재제조 산업을 활성화 하기 위해선, 원제조업체, 재제조업체 그리고 수리업체 사이의 협력을 지원하기 위해 기본 원칙을 제정하여야 한다. 재제조 활성화를 위한 기본 원칙들은 재제조 절차와 주요 구성원간의 관계분석에 의해 평가될 수 있다. Remanufacturing is one alternative to conserve the good environment of our earth and to save the production resources and manufacturing energy. To make active remanufacturing in Korea we have to prepare basic rules to support the collaboration among the original manufacturing, remanufacturing, and repairing companies. Basic rules for active remanufacturing can be established by the analysis of recently environments of remanufacturing procedures and the relationship among the main constituents.
목학수,한창효,전창수,이정훈,이규창,성인철,송재용,Mok, Hak-Soo,Han, Chang-Hyo,Jeon, Chang-Su,Lee, Jung-Hun,Lee, Kyu-Chang,Sung, In-Cheol,Song, Jae-Yong 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.3
In this paper, we analyze the standards of the bolts for maintaining the products. The maintainer don't know the detail information of bolts by seeing the shape of bolts when they repair the products. So they waste much time and cost. To solve the these problem, we propose the new systematical discrimination of bolts. To propose the discrimination code, we divide the shapes of the bolts into four classes(head, internal drive, shank and end). User can fine preferentially similar standards by just the shapes of bolts under the this discrimination code. And, User can find the standards of bolts that they want by using the additional information such as measurements. We will reduce the cost and time for the maintaining the products by using the proposed discrimination code.
입사각의 변화에 따른 터빈 캐스케이드에서 손실계수에 관한 실험적 연구
이주형,허원회,전창수,Lee, Ju-Hyung,Hur, Won-Hae,Jeon, Chang-Soo 한국유체기계학회 1999 한국유체기계학회 논문집 Vol.2 No.4
For the study on loss coefficients of turbine cascade with variation of incidence angle, the wind-tunnel tests were performed under the ranges in velocity of 10 m/s, 15 m/s, 20 m/s and incidence angles from $-20^{\circ}\;to\;20^{\circ}$ by intervals of $5^{\circ}$. Comparing our results with Soderberg's prediction, differences in loss coefficient were $2.5\%\;and\;2.8\%$ each for 10 m/s and 15 m/s. A large disagreement of $30.3\%$ was showed at 20 m/s freestream velocity. The comparisons of these test results with Ainley's prediction showed an $8\%$ difference in the case of 20 m/s freestream velocity. Test results were approximately comparable with Ainley's loss prediction's in incidence angles. Generally, averaged total pressure loss seemed to be decreased as Reynolds number increased. The total pressure loss coefficients were increased parabolically, as incidence angles were increased negatively and positively from $0^{\circ}$, in all speed ranges. At the far low freestream velocities, minimum loss accurred between $-5^{\circ}\;and\;+5^{\circ}$. But this minimum range narrowed the location of this range by shifting to the direction of the angle as freestream velocity was increased.