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Effect of Protection Design Parameters on Mine Blast Impact Characteristics
박찬영(Chanyoung Park),조종두(Chongdu Cho) Korean Society for Precision Engineering 2018 한국정밀공학회지 Vol.35 No.5
While designing an armored vehicle platform, survivability is the most important capability and so protection design should be performed. In particular, mine protection design should be preferentially considered in a way that can reduce mass casualties. In this study, a simplified model, the main design parameters and their levels were defined, and then mine blast simulations were performed to obtain an effective protection design procedure. Before performing the main simulation, an experiment and simulation for a simple armor plate were performed and compared in order to certify the reliability of the numerical model. Afterwards, simulation cases, which were based on the reasonable numerical model, were defined by the DOE (Design of Experiment). An evaluation of the simulation results was carried out through both the contour and in a statistical manner, via a main effect analysis and ANOVA (Analysis of Variance). Finally, the impact characteristics of a protection parameters under the mine blast were estimated.
Effect of High Hardness Armor Plate Sequences on Ballistic Impact Response
박찬영(Chanyoung Park),조종두(Chongdu Cho) Korean Society for Precision Engineering 2017 한국정밀공학회지 Vol.34 No.6
In this study, a numerical analysis on the impact response of HHA (High Hardness Armor Plate) sequences under a 7.62 mm projectile impact was performed to obtain the fundamental design data for a combat-vehicle platform. Recently, the ballistic-protection levels for combat vehicles have increased, and ballistic-protection designs should now be able to deflect multi-hit projectiles. To study the ballistic-impact characteristics, armor-plate sequences of one or two layers with a gap of 0 mm to 2 mm between the front and rear plate were defined under the same weight and thickness. For the certification of the reliability of the numerical model, ballistic tests and an analysis of the single plate under the 7.62 mm projectile impact were performed and analyzed. On the basis of a valid numerical model, a numerical analysis was performed and analyzed. Lastly, it was proved that the performances of the two-layer sequence with the 2 mm gap regarding the impact-response acceleration, deflection efficiency, and penetration depth are the highest.
반응표면분석법을 이용한 증숙 맥문동 첨가 양갱의 품질 특성 및 당류 저감화 조건 연구
박찬영(Chanyoung Park),박소해(So Hae Park),김원백(Won Baek Kim),황지희(Ji Hoe Hwang),이희섭(Heeseob Lee) 한국식품영양과학회 2017 한국식품영양과학회지 Vol.46 No.2
본 연구에서는 증숙 맥문동을 첨가한 양갱 제조조건을 반응표면분석법을 이용하여 최적화하여 저칼로리 양갱의 개발가능성을 검토하고자 하였다. 증숙 맥문동 열수 추출물, 설탕 및 한천의 함량을 독립변수로 하여 16가지의 양갱을 제조하여 pH, 수분 함량, 당도, 색도 및 갈변도 등의 이화학적 품질 특성과 조직감, 관능평가를 수행하였다. 이화학적 품질 특성 중에서 pH 및 갈변도는 증숙 맥문동 열수 추출액, 당도 및 수분 함량은 설탕, 색도는 증숙 맥문동 열수 추출액과 설탕의 양이 품질 특성에 더 많은 영향을 나타냈으며, 조직감에 있어서 씹힘성과 검성은 분말한천의 양에 의존하는 경향을 나타내었다. 또한, 관능평가에 있어서 유의성을 나타낸 외관, 색, 단맛, 단단함, 질감 및 종합적인 기호도의 경우 증숙 맥문동 열수 추출물, 설탕이 증가할수록 기호도가 증가하는 것으로 나타났다. 이러한 결과를 바탕으로 당류의 사용은 최소화하면서 최적의 양갱의 품질 특성 및 기호도를 나타내는 조건은 증숙 맥문동 열수 추출물이 35 mL, 설탕은 55.23 g, 분말한천은 3.39 g으로 최적 첨가량이 예측되었으며, 기본 배합비와 비교한 결과 단맛은 유의적 차이가 나타나지 않고 그 외의 모든 관능평가 항목에서 유의적으로 우수 하였다. 따라서 증숙 맥문동을 식품에 활용할 경우 다양한 저칼로리 제품의 개발에 이용이 가능할 것으로 판단된다. This study was performed to optimize yanggaeng processing conditions prepared with different amounts of steamed Liriopis tuber (SLT) extract, sugar, and agar powder using response surface methodology. The experimental conditions were designed according to the central composite design with 16 experimental points, including two replicates for three independent variables. The experimental data on physicochemical properties, textural properties, and sensory evaluation were fitted to various models, and the accuracy of the equations was analyzed by ANOVA. Among the responses, pH, water content, sugar content, L-value, browning index, chewiness, gumminess, and sensory properties of appearance, color, sweetness, hardness, texture, and overall acceptability showed significant correlation with contents of SLT, sugar, and agar powder. From these results, optimum formulation of yanggaeng was calculated as follows: SLT 35 mL, sugar 55.23 g, and agar powder 3.39 g.