초임계 이산화탄소를 이용한 국산 생강뿌리로부터 생강유의 추출

Extraction of Ginger Oil from Korean-Grown Ginger-root using Supercritical Carbon Dioxide

The type photographic optical system is designed by using numerical method. Initially the paraxial quantites, numerical solutions are found for the system which is free from the Seidel seven aberrations. The final system has f/4 with the half field angle 20$^{\circ}$, and the image size is 36mm with the focal length of 50mm.