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40MM KM2 추진제의 연소 성능 개선을 통한 약량감소 연구
김연상,곽금표,김상민 국방기술품질원 2021 국방품질연구논집 Vol.3 No.2
In this study, we performed combustion improvement test to reduce propellant charge weight of 40MM high-velocity grenade. Throughout the research, We have been varified Closed Bomb Test(CBT) is more reliable method for predicting Internal Ballisitcs than 5.56mm rifle tests. With improvement of propellant manufacturing process, we confirmed similar level of propellants charge weight to the U.S. 40MM high-velocity grenade. This paper suggest quality and safety improvement of 40MM high-velocity grenade, using Closed Bomb Test evaluation method.
금속수소화물(DiNi<sub>5</sub>-H<sub>2</sub> system)의 수소 흡수-방출 특성과 반복 효과에 관한 연구
김연상,조춘구,Kim, Youn-Sang,Zhoh, Choon-Koo 한국공업화학회 1990 공업화학 Vol.1 No.1
This paper summarizes fundamental research on a metal hydrides for the development of new energy. We made a study of the characteristics of the hydrogen absorption-desorption of $DiNi_5$ alloys. As a result, we found that the maximum amount of the hydrogen absorption of $DiNi_5$ alloys (the maximum in the absorption equilibrium pressure section) was H/M=1.04 at $30^{\circ}C$. The hysteresis was the smallest at $30^{\circ}C$. The capability of the hydrogen absorption-desorption was excellent. The number of cycles of the hydrogen absorption-desorption was about 9000 times at $30^{\circ}C$. We found also that the rate of the hydrogen desorption was the largest at $40^{\circ}C$. 이 논문은 새로운 에너지 개방을 위한 금속수소화물에 대한 기초연구를 요약한 것이다. $DiNi_5$ 합금의 수소 흡수 및 탈착 특성을 조사하였다. $30^{\circ}C$에서 $DiNi_5$ 합금의 최대 수소흡착량은 H/M=1.04였고 $30^{\circ}C$에서 히스테리시스가 가장 작았다. 이 합금의 수소 흡 탈착 능은 우수하였다. $30^{\circ}C$에서 수소의 흡 탈착 반복회수는 약 9000번 정도 였으며, 수소 탈착속도는 $40^{\circ}C$에서 최대를 보였다.
면역전자현미경적 관찰을 위한 동결초박절편의 미세구조 보존
김연상,채희선,김경용,이원복,Kim, Yun-Sang,Chae, Hee-Sun,Kim, Kyung-Yong,Lee, Won-Bok 한국현미경학회 1998 Applied microscopy Vol.28 No.4
The cryoprotection, section retrieval and embedding methods were studied for the preservation of ultrastructure of ultracryomicrosections in immunoelectron microscopy. The results obtained were as follows. 1. The cryoprotection of ultrastructure with a mixture containing 1.7 M sucrose and 15% polyvinylpyrrolidone was better than that with 2.3 M sucrose. The stretching caused by surface tension and the electron lucent holes decreased more in the cryosections infused with 2.3 M sucrose than in those with the mixture. 2. The difference between section retrieval solutions in cases of cryoprotection with 2.3 M sucrose was that the destructive .effects such as electron lucent holes and stretching between myofribrils were less in a mixture containing 1% methylcellulose and 2.3 M sucrose than in 2.3 M sucrose. The difference was obscure in the mixture containing 1.7 M sucrose and 15% PVP, but the destructive effects were slightly less in a mixture containing 1% mthylcellulose and 2.3 M sucrose than in 2.3 M sucrose or 1% methylcellulose. 3. The embedding of cryosection on drying with 2% PVA or 2% methylcellulose exhibited some protective effect during observation with transmission electron microscope, but made the ultrastructure more obscure. 4. Mitochondrial membrane and cristae and myofilaments were well delinated in sections infused with 2.3 M sucrose and retrieved with 1% methylcellulose and 2.3 M sucrose. In summary, it is suggested that the cryoprotection with 2.3 M sucrose and section retrieval with a mixture containing 1% methylcellulose and 2.3 M sucrose are good for the ultrastructure of cryosections.
김연상,Kim, Yeon-Sang 한국과학기술단체총연합회 1995 과학과 기술 Vol.28 No.1
건축자재 전문제조업체로 20년 전통을 자랑하는 (주)럭키건업은 최근「세라믹 하이텍 팬널」이라는 건축용 내외장재인 신제품을 개발, 각광을 받고 있다.