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차기업,이영현,이성배,조창기,Cha, Ki-Up,Cha, Young-Hyun,Lee, Sung-Bae,Cho, Chang-Ki 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.6
Rifling force has a torsion impulse effect on the gun tube and thus generates undesirable vibration of the gun tube about its bore axis, putting additional stress on the projectile. High rifling force at the muzzle of the gun tube may adversely influence the trajectory of the projectile. And, the service life of rifled gun barrels is known to depend on the rifling force. Rifling force along the path of the projectile in the longitudinal direction of the gun tube can be described with projectile mass, projectile velocity, gas pressure curve and rifling angle. Under the same conditions, the character of the rifling of the gun barrel decisively influences the rifling force curve. To reduce the above mentioned harmful effect, locally distinct maximum of rifling force has to be avoided and maximum rifling force needs to be minimized. The best way to minimize the maximum rifling force is to design a rifling angle function so that the rifling force curve has a near trapezoidal shape. In this paper a new approach to make the optimal rifling force curve is described. The rifling angle determining the rifling force is developed by combined Fourier series and polynomial function to satisfy both the convergence and boundary condition matching problems.
폐색전증에서 나선형 컴퓨터 전산화 단층촬영의 관찰자간의 일치도에 관한 연구
김양기 ( Yang Ki Kim ),이영목 ( Young Mok Lee ),김기업 ( Ki Up Kim ),어수택 ( Soo Taek Uh ),김용훈 ( Yong Hoon Kim ),박춘식 ( Choon Sik Park ),황정화 ( Jung Hwa Hwang ),김동훈 ( Dong Hun Kim ),구동억 ( Dong Erk Goo ),최득린 ( Deuk 대한결핵 및 호흡기학회 2005 Tuberculosis and Respiratory Diseases Vol.59 No.5