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양영수,이세환 대한용접접합학회 1998 대한용접·접합학회지 Vol.16 No.1
The accuracy of the finite element method depends upon the mesh that is used in the analysis. The temperature around the arc is higher than the melting point of the materials, and it drops sharply in the regions just away from the arc. This requires an extremely fine mesh in the confined high temperature region to predict the temperature accurately in that region. But the computational time increases with the fineness of mesh. Since fine mesh is required only around the arc source, adaptivity of the input mesh according to the position of the arc source is efficient. The remeshing technique gives a fine mesh in the high temperature region around the arc and a coarse mesh in other region at any time step. With this it is possible to achieve desired accuracy with less computation time. In this study a transient adaptive mesh, remeshing technique, is developed and calculated temperature for a sample problem.
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후각 기능에 대한 선별검사로서 자가 측정 후각 설문지(Scent Survey for Screening Test)의 임상 실행 가능성
양영수,최혜랑,조재훈,홍석찬,김진국 대한비과학회 2018 Journal of rhinology Vol.25 No.1
Background and Objectives: The scent survey for screening (SSS) test is a subjective olfactory questionnaire devised for this study. We demonstrated the correlation of the SSS test with other olfactory tests and the efficacy of the SSS test as an olfactory screening test compared to KVSSII. Subjects and Method: A total of 363 patients who visited our ORL outpatient department underwent the SSS test, VAS, and KVSS I and II. The patients were divided into two groups, a group with normal olfactory function and a group with olfactory dysfunction according to the KVSS II test. In each group, the correlations between the olfactory tests were studied, and the cutoff value of the SSS test as a screening test was investigated. Results: There was positive correlation between CCSIT and KVSS I, II, T, D, and I tests and the SSS test in the total group and in the olfactory dysfunction group (p<0.05). The identification test in the KVSS II showed the highest positive correlation. While the cut-off value of normal olfactory function in the KVSS II is 28, the SSS test showed the highest specificity and sensitivity of 74 under an ROC curve. Conclusion: The SSS test showed very high correlation with other olfactory tests, especially in an olfactory dysfunction group. This result indicates that the SSS is appropriate as a screening test to select people with olfactory disorder.
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양영수,손광재,강대현 대한용접접합학회 2000 대한용접·접합학회지 Vol.18 No.4
This paper presents a study of the solder bumping process. The theoretical model, based on the variational principle instead of solving the Navier-Stokes equation with moving boundaries, was developed to considered the energy dissipation in semi-solid phase and the approximate solidification time of the molten metal droplet. The simulation results revealed that the developed model could reasonably describe the collision behavior of molten metal with solid surface. Simulations were made with variation of initial droplet temperature, substrate metal and initial substrate temerature.
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양영수 대한용접접합학회 1996 대한용접·접합학회지 Vol.14 No.1
The heat transfer and thermal stress-distribution were numerically determined by using the finite element method for a butt-welded pipe. A mechanical stress relieving(MSR) treatment which has been frequently used in the fabrication of pressure vessels instead of the post weld heat treatment (PWHT) was also simulated to investigate its effect of reducing the residual stress in the welded zone by a mechanical loading.
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