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양경수 대한기계학회 1994 大韓機械學會誌 Vol.34 No.9
이 글에서는 난류유동의 수치모사 기법으로서 최근 주목을 받고 있는 LES에 대해서 살펴보았다. LES의 개념은 공간에서의 여고에 근거를 두고 있으며 따라서 난류모델은 작은 스케일의 유동 구조에만 국한된다. LES의 이러한 장점은 DNS에 좀도 가까운 난류모델링의 가능성을 의미한다. 또한 그간 발전된 LES의 기법들에 대해 고찰해보았으며 LES는 DNS의 처선책으로서 난류유 동을 예측하기 위한 도구로서 그 전망은 매우 밝다.
양경수,Yang, Gyeong-Su 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.9
Transitional flow in an obstructed channel is investigated using numerical simulation. Two-dimensional thin obstacles are mounted symmetrically in the vertical direction and periodically in the streamwise direction. Flow separation occurs at the tip of the sharp obstacles. Depending on the Reynolds number, the flow undergoes Hopf bifurcation as the primary instability leading to a two-dimensional unsteady periodic solution. At higher Reynolds numbers, the unsteady solution exhibits a symmetry-breaking bifurcation which results in an unsteady asymmetric solution. The results are compared with experiments currently available, and show a good agreement.
양경수,김도형,Yang, Gyeong-Su,Kim, Do-Hyeong 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.1
In this study, turbulent flows in a grooved channel are numerically investigated by Large Eddy Simulation (LES). Especially, a parametric study is carried out to study effects of length and depth of a groove on large-scale flow structures. For one test case, comparison of LES results with those of DNS reveals a good agreement even though the number of grid points of LES is only 6.5% of that of DNS. This confirms that LES is a suitable tool for a parametric study of turbulent flows. The subsequent parametric study using LES shows that the large-scale turbulent structures are significantly affected by the geometry of the groove. Especially, when the length of the groove is short such that the recirculation region occupies the entire groove, the turbulent flow in the groove becomes very weak in both mean and fluctuation quantities.
천이박리유동의 직접수치모사 Part II:이차적 불안정성
양경수,Yang, Gyeong-Su 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.9
Secondary instability in an obstructed channel is investigated using direct numerical simulation. Flow geometry under consideration is a plane channel with two-dimensional thin obstacles mounted symmetrically in the vertical direction and periodically in the streamwise direction. Flow separation occurs at the tip of the sharp obstacles. As a basic flow, we consider an unsteady periodic solution which results from Hopf bifurcation. Depending on the Reynolds number, the basic flow becomes unstable to three-dimensional disturbances, which results in a chaotic flow. Numerical results obtained are consistent with experimental findings currently available.
이주민의 사회통합을 위한 이문화 요인 분석 : 이집트 사례를 중심으로
양경수,정창근 韓國中東學會 2013 韓國 中東 學會 論叢 Vol.34 No.1
The purpose of this study is to explore the affect of Korea social integrity by the Egyptian immigrant under the cultural differences, institutional differences, regional differences and economic differences between Korea and Egypt. The higher the social adaptation of cultural differences also affect positively but it they would not expect of the social support of Korea. Institutional differences case they are recognize the more large institutional differences between two countries would be able to get Korean social support. Geographical differences in the social adaptation of a very positive impact that showed support in Korea, even the geographic differences were not significant question. Recognizes the significant economic differences and the more the Egyptians have a negative effect on social integration. In conclusion, In Egypt, the Egyptians working for social adaptation of the more social integration in Korea will also be positive. Social integration of foreign migrants in Korea in order to improve their social adaptation of migrants working in Korea's social integration can be seen as effective.
어머니의 취업유무와 아동의 자아개념이 행동문제에 미치는 영향
양경수 한국아동교육학회 2002 아동교육 Vol.11 No.2
The purpose of this study is the investigation of the effect of a mother's employment and children self-conception on the behavior problem. We made up questions of children's problem behavior for 340 of elementary school students, including 182 boys and 168 girls, in the fourth, fifth, and sixth grade on this purpose. We estimated behavior problem by using a scale of behavior estimation modified by Han Mi-Hyun(1996), developed by Achenbach(1991) for four to eighteen year korean children. The reliability of the scale is .89. We also estimated the children self-conception by using a test developed by Kim Jung-Gyu(1992) and based on Shabelson & Bolus model of self-perception structure(1982) of which the reliability is .90. MAVOVA was used as a statistic method to investigate data, and the results are as follows. Ⅰ. Academic self-concept and social self-concept for the children with employed mother are higher than those with unemployed mother. Ⅱ. The children with employed mother showed more hyperactivity than those with unemployed mother. Ⅲ. Children with low self-conception showed more anxious behavior, withdrawal behavior, and immature behavior than those with high self-conception. Ⅳ. There's no interaction between the mother's employment and children self-perception in the behavior problem.