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자하거(紫河車) 약침(藥鍼) 제제(製劑)에 대(對)한 고찰(考察)
이상길,이재동,고형균,박동석,이윤호,강성길,Lee, Sang-Keel,Lee, Jae-Dong,Koh, Hyung-Kyun,Park, Dong-Suk,Lee, Yun-Ho,Kang, Sung-Keel 대한침구의학회 2000 대한침구의학회지 Vol.17 No.1
Hominis Placenta has been used as a medicinal stuff for a long time in Oriental Medicine. And further, aqua-acupuncture solution of Hominis Placenta has produced in South Korea recently. Bibliographical study was carried on to investigate the nature of Hominis Placenta and possible indications by aqua-acupuncture as well. The nature of Hominis Placenta is warm and its taste sweet-salty. It is non-poisonous. It has correspondence to the meridians of lung, liver and kidney. Hominis Placenta is mainly effective on recuperation of infirmity and the disease related to infirmity. Aqua-acupuncture solution of Hominis Placenta can be applied to the disease as chronic hepatitis, liver cirrhosis, asthma, pulmonary tuberculosis, sterility, insufficient lactation, degenerative change, neurasthenia and cerebrovascular disease.
탄저압력계수를 이용한 5.56mm 소총의 압력-이동거리 곡선 산출
이상길,이강영,Lee, Sang-Kil,Lee, Gang-Young 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.3
As the propellant mass is being accelerated out of the gun chamber along with the projectile, a continuous pressure gradient exists between the end of chamber and the base of the projectile. For this reason, the base pressure-travel curve is very important to design a conventional gun barrel in the interior ballistics, but it is not obtained briefly by empirical or theoretical method. In this paper, a simple relation between chamber pressure and base pressure was determined by the factor of base pressure(Cb) obtained from the experimental method. The simple relation gives a reasonable prediction for the reduction of pressure between the breech and the base of projectile owing to the axial gradient in the gun tube. The predictions have been validated by the infrared screen sensor and the PRODAS(PROjectile Design and Analysis System) for interior ballistic systems. Therefore, the base pressure-travel curve could be calculated from the chamber pressure measured by piezoelectric sensor. The base pressure-travel curve obtained from the simple relation offers initial information to gun barrel designer and is used for calculation of muzzle velocity.