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PELE의 경사진 충격에 따른 파괴 메커니즘에 대한 연구
조종현,이영신,Jo, Jong-Hyun,Lee, Young-Shin 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.5
Penetrator with enhanced lateral effect(PELE) is a newconcept projectile, without dynamite and fuze. It consists of high-density jacket, closed at its rear end and filled with a low-density filling material. To study the explosion characteristics of PELE, by AUTODYN-3D code, the calculation models of projectile body and bullet target are established and the process of penetrating aluminum-2024 alloy target of PELE is simulated, and the scattering characteristics after penetrating aluminum-2024 alloy target of PELE are studied by different initial velocity. The explicit finite element analysis of PELE fragmentation was implemented with stochastic failure criterion in AUTODYN-3D code. As expansion of filling, the fragments were obtained velocities and dispersed laterally and further more enhancing the damage area largely. The number and shape of the PELE fragments were different depend on impact velocity and incidence angle of filling which fragment generated during penetration and lateral dispersion process.
폐경기 여성들의 요추 골밀도와 요부근력, 유산소 능력과의 상관관계
조종현,제세영,박원하,장경태 대한스포츠의학회 1997 대한스포츠의학회지 Vol.15 No.1
The purpose of this study was to examine the relationship of back strength and aerobic capacity to lumbar bone mineral density in fifty postmenopausal women(mean age : 56.2 years). Bone mineral density of the 2nd, 3rd, 4th lumbar vertebrae was measured by dual energy X-ray absorptiometer(DEXA), and back extensor strength was determinded with use of a MedX lumbar extension machine. Maximal oxygen consumption(VO_2peak) determined by graded exercise test with respiratory gas analysis. The following results were obtained. 1. Lumbar bone mineral density was significantly correlated with age, body weight, back strength, length of postmenopausal period. Height, percent body fat, grip strength, and VO_2peak had no correlation with lumbar bone mineral density. 2. With the multiple regression analysis the most significant predictors for lumbar bone mineral density were back strength had length of postmenopausal period. The results of the study stggest that to prevent or delay the bone mineral loss with aging, exercise which increase the aerobic capacity.