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사종엽(J. Y. Sah),유종근(J. G. Yu) 한국전산유체공학회 1999 한국전산유체공학회 학술대회논문집 Vol.1999 No.-
CAFPlot has been developed for visualizing a wide range of technical data. It offer 2D and 3D plot in a variety of formats.
2차원 자유표면 점성 유동 계산 코드 개발에 관한 연구
허준성(J.S. Huh),사종엽(J.-Y. Sah) 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-
A computer code has been developed for the analysis of 2D viscous flow with free surface. VOF method and higher order upwind scheme have been employed for the accurate prediction of free surface motion. Surface tension effect and axisymmetric flow can be computed by the present code.
DEM(Discrete Element Method)를 사용한 분체 유동해석
최정욱(J. W. Choi),사종엽(J. Y. Sah) 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-
The discrete element method is a numerical model capable of describing the mechanical behaviour of assemblies of discs and spheres. The method is based on the use of an explicit numerical scheme in which the interaction of the particles is monitored contact by contact and the motion of the particles modelled particle by particle. In this paper, A two-dimensional model for computing contacts and motions of granular particles of uniform, inelasticity is presented. And. code is developed. The primary aim of this paper is to approve computational. result of continuum analysis which is on processing. The end of this paper, that code is tested with several examples.
신찬배,이재원,사종엽,이상천,조성환,서항석,Shin, C.B.,Lee, J.W.,Sah, J.Y.,Lee, S.C.,Cho, S.H.,Suh, H.S. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.3
The heat transfer model of ondol heating system is derived in the linear form. The step responses of On-Off controller, PID controller and Position type fuzzy controllers are compared in the sense of several aspects : variation of temperature feedback variable, variation of supplied heat quantity by the boiler, variation of flow rate, variation of thickness of the base, variation of the outdoor temperature.
지역사회 성인의 혈압측정횟수 및 연령에 따른 혈압의 차이
박경연 한국기초간호학회 2019 Journal of korean biological nursing science Vol.21 No.4
Purpose: This study aimed to identify the differences in blood pressure among adults in the community according to age and time of the blood pressure measurement. Method: This was a secondary analysis study, using data from a 2015 community health survey, conducted by the Korea Centers for Disease Control and Prevention. The data of three-time-measured blood pressure were collected from 337 subjects, 25, 35, 45, 55, 65, 75 years old, which are median ages by each age group. Results: The primary systolic pressure was significantly higher than the secondary systolic pressure (t = 3.46, p = .001) and the tertiary systolic pressure (t = 4.83, p = .001). The secondary systolic pressure was higher than the tertiary measurement (t = 2.05, p = .041). There was no significant difference between the three-time-measured values for diastolic pressure. There was a significant interaction between measurement times and age in the systoic blood pressure readings (F = 1.95, p = .036). However, there was no significant interaction between measurement times and age in the diastolic blood pressure readings (F = 1.03, p = .418). Conclusion: The findings suggest that attention must be paid to the use of blood pressure values in studies or one-time-measured clinical blood pressure values. In particular, the differences in systolic pressure readings taken at different times in the older age groups were significant. Therefore, it is more important to carefully assess blood pressure in adults over the age of 45 compared to other age groups.
해석적 자동격자생성방법에서 보간방법에 따른 조절함수의 영향에 관한 연구
채은미(E. M. Chae),사종엽(J. Y. Sah) 한국전산유체공학회 1996 한국전산유체공학회지 Vol.1 No.1
This study examines effect of various interpolations of interior control function for analytic ,methods such as Thomas.-Middlecoff and Sorenson methods. Laplace interpolation 15 developed and compared among linear interpolation and exponential Interpolation systematically.
2차원 비정렬 격자를 이용한 전도 및 대류 열전달 계산 코드 개발
채은미(E.M. Chae),사종엽(J.-Y. Sah) 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-
A computer code has been developed for an analysis of conduction and convection heat transfer on a personal computer. FVM based on unstructured mesh has been employed for triangular and quadrilateral element. An variable of p, u, v, T, χ and ε has been defined on a node (not on a center of element). The code possesses the pre-and post-processor for itself to provide user-friendly interface.
형상 모델러의 자료구조에 의한 수정 Delaunay 삼각화
채은미(E. -M. Chae),사종엽(J. -Y. Sah) 한국전산유체공학회 1997 한국전산유체공학회지 Vol.2 No.2
A modified Delaunay triangulation technique is tested for complicated computational domain. While a simple geometry, both in topology and geometry, has been well discretized into triangular elements, a complex geometry having difficulty in triangulation had to be divided into small sub-domains of simpler shape. The present study presents a modified Delaunay triangulation method based on the data structure of geometric modeller. This approach greatly enhances the reliability of triangulation, especially in camplicated computational domain. We have shown that efficiency of Delaunay triangulation can be much improved by using both the GUI (Graphic User Interface) and OOP (Object-Oriented Programming).