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무월경 환자의 DITI와 HRV, 체성분 분석을 통한 특성 연구
정재혁,이진무,이창훈,조정훈,장준복,이경섭,Jeong, Jae-Hyuk,Lee, Jin-Moo,Lee, Chang-Hoon,Cho, Jung-Hoon,Jang, Jun-Bock,Lee, Kyung-Sub 대한한방체열의학회 2009 대한한방체열의학회지 Vol.7 No.1
Purpose : The purpose of this study is investigate the characters of DITI, HRV and Body composition analysis in Amenorrhea. Methods : We studied 47 patients visiting OO hospital from 1st October 2007 to 19st September 2009. The subjects were categorized in two groups, amenorrhea group(26) and normal group(21). We studied the difference of DITI, HRV and Body composition analysis between two groups by Mann-whitney test using SPSS for windows(version 12.0). Results : there is not statistically significant difference of DITI, HRV and BMI between amenorrhea group and normal group. But there is statistically significant difference of percent body fat and waist-hip ratio between amenorrhea group and normal group. Conclusion : Percent body fat and Waist-Hip ratio of amenorrhea groups is lower than normal groups. Percent body fat and Waist-Hip ratio can be diagnosis index.
장대 터널 내 구난역의 열차 화재 시 제연을 위한 1D-3D 연계 해석
정재혁(Jae Hyuk Jung),허남건(Nahmkeon Hur),이정표(Jung-Pyo Lee),김진곤(Jin Kon Kim) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.10
In the present study a 1D-3D numerical simulation was performed to analyze the fire safety in a rescue station of a long railroad tunnel equipped with a mechanical ventilation. The behavior of hot air was studied for the emergency operation mode of ventilation system in case of fire in the rescue station. The 1D simulation was carried out for entire tunnel region. Detailed 3D CFD simulation was performed for the rescue station area in the central region of the tunnel by using the result of the 1D simulation as the boundary condition of the 3D simulation. Various type of cross passage installation were evaluated for the prevention of smoke diffusion to suggest the optimized interval of the cross passages in the rescue tunnel.
토크컨버터의 성능 예측 정확성 향상을 위한 열유동 해석기법 연구
정재혁(Jae Hyuk Jung),이명성(Myungsung Lee),허남건(Nahmkeon Hur),장재덕(Jae Duk Jang),홍순석(Soon Seok Hong) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
Recently, the steady and transient incompressible viscous turbulent flow is simulated for performance prediction of a torque converter with various numerical methods. In the previous study, even though the transient analysis requires substantial computational resource than that of steady analysis, both the steady and transient analysis predicted fairly accurate results with the experimental data. In the present study, the influence of viscosity variation on prediction of performance was investigated by thermo-fluid analysis. Flow regions of each parts of entire torque converter are modeled for the analysis by using the polyhedral mesh. The thermo-fluid analysis shows more accurate result than fluid analysis on the capacity factor.