낙하 높이에 따른 비산혈흔의 충돌각도 개선공식에 관한 연구

Bloodstain Pattern Analysis is a technique used to reconstruct crime scenes. There are various patterns of blood strewn around the crime scenes, and bloody parts without protrusions can be used to estimate a Area of Origin by calculating the impact angle by mathematical formula. However, the formula currently used is a linear method that produces errors by various variables. Therefore, it differs from the actual impact angle. To overcome this, a formula for difference in surface has been studied in previous studies. However, this formula also can differed with the results depending on its height, so the study drew a more calibrated formula taking into consideration the differences in height among various variables. Experiments were carried out at intervals of 10° from 20° to 70° at intervals of 20cm from 20cm to 100cm in height, but 20cm and 40cm were excluded because they showed no tendency. As a result It has been concluded that the formula for the height is different for each height, so we have to decide what is the most optimal formula and what to experiment further. The most optimal formula was concluded provisionally is W/L=0.9048 sin(0.02683?-0.1974)+0.1172 sin(0.06951?+1.728) this equation is based on experimental data and It was chosen because the error rate was the lowest among the derived formulas. Based on this study, experiments required later will be different collision angles depending on the speed.