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A Study on the Deduction of Internal Temperature through the Ground Magazine Roof Type Improvements
Myoungjin Choi,Hyungju Park,Jaekyung Yang,Beksun Kim 한국산업경영시스템학회 2013 한국산업경영시스템학회 학술대회 Vol.2013 No.춘계
Among ammunitions which are stored in a war field, the lifespan of propelling gunpowder is affected by storage environment such as storage temperature, humidity, and exposure to sunlight. These are because Nitrocellulose (NC) which is the main component of propelling gunpowder can be naturally disassembled to unstable substances similar with other nitric acid ester. We can’t prevent it fundamentally from being disassembled, but to restrain induction of automatic disassembly by decomposition product, a decomposition product (NO2, NO3, and HNO3) and tranquillizer DPA (Diphenylamine), having high reactivity, are added into a propellant. For this, it will decrease the velocity of tranquillizer which can also affect the velocity of producing the decomposition product of NC, storage temperature or humidity of propelling gunpowder is higher, drop of tranquillizer content is much faster. Therefore, to extend storage lifespan of propelling gunpowder, it is really important to control storage temperature or humidity inside the magazine. Hereupon, according to the manufacture of small scale model magazine and the result of performing experiments and measuring variation of inside temperature(storage temperature), using roof types that have a steel slate structure of magazine among ground magazines, this research shows the differences in details.
MyoungJin Kim,Sung-Bae Roger Park 한국코칭능력개발원 2017 International Journal of Coaching Science Vol.11 No.2
Analysis of the commonly used statistical techniques and statistical software packages can improve statistics education. The purpose of this study was to examine the use of statistical techniques in recent sport management research studies published in the Journal of Sport Management (JSM). To do so, the authors reviewed the 222 published articles in JSM between 2006 and 2015. The results indicated that descriptive statistics were the most frequently used in sport management research articles accounting for 57.61% of all statistical techniques used and that SPSS was the most frequently used statistical software. Our findings offer important considerations for statistics education in both academia and practice.