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함수비가 모래의 체적 변화에 미치는 영향에 대한 실험연구
김병규(Byeong-Kyu Kim),이두호(Du-Ho Lee),최세호(Se-Ho Choi),양기석(Kee-Sok Yang) 한국연안방재학회 2020 한국연안방재학회지 Vol.7 No.4
Among the soft solutions for coastal maintenence, the nourishment is applied for the purpose of solving the problem of sand supply or dynamic unbalance. but because nourishment was constructed by non-compacting, It is difficult to confirm the exact amount of sand due to compressed sand according to time and environmental factors. In this study, for providing basic data to solve these problems, the column test, the mess-cylinder test and compaction test were performed using sand collected from three locations in Korea. The void ratio was analyzed according to the particle diameter, working energy, and moisture content through experiments. It was found that volumetric change for increasing moisture content of sand was increased as the particle diameter was decreased. In addition, The compaction effect according to the experimental factors was confirmed a smaller volume change than the compaction A and D, but the compaction effect is expected to increase when additional environmental factors are considered.
분산분석을 활용한 K11 복합형소총 사격통제장치 균열발생 원인 연구
신상식 ( Sang Sik Shin ),김병규 ( Byeong Kyu Kim ),심철보 ( Chul Bo Sim ) 한국품질경영학회 2015 품질경영학회지 Vol.43 No.3
Purpose: This study examined the problem of crack formation in the fire control system(FCS) of the K11 objective individual combat weapon(OCIW), using design of experiment analysis. Three hypothesis were considered. The first hypothesis is that bolted joint has an effect on impulse caused by firing the weapon and the second hypothesis is that a short time interval of shooting has an effect on impulse and lastly, the third hypothesis is that a positive correlation has between the bolted joint of the FCS and the impulse. Methods: The relationship between the bolted joint and the impulse cause by firing the weapon were examined experimentally. The first and second hypothesis was tested using correlation analysis and the t-test. Results: Using ANOVA, the first null hypothesis was rejected and the alternative hypothesis was accepted. ANONA confirmed the second null hypothesis. Correlation analysis dismissed the last null hypothesis. A positive correlation between the bolted joint and the impulse caused by shooting the weapon was verified. Conclusion: The bolted joint of the K11 FCS and the barrel of the K11 affect the impulse caused by firing the weapon. A positive correlation was established between the bolted joint of the FCS and the impulse on firing the K11 OICW.