earticle

영어

The only cutTently available method of estimating blood origins of impact spatter bloodstain is a straight-line trajectory method based on the assumption that blood droplets travel in straight-line trajectories. However, since blood droplets actually follow a parabolic trajectory due to the effect of gravity and air resistance, there i s an urgent need for a method of estimating blood origins considering the parabolic trajectory in the analysis of impact spatter blood stain in bloodshed criminal incidents. In the present study, the equations of motion of blood droplets were analyzed to derive an estimation algorithm including a parabolic trajectory analysis, and a blood origin estimation program based on the algorithm was developed and validated. The results showed that the error rate of the software program developed in the present study, NFS Spatter Trajectory (NST), was lower than that of the conventional method by a maximum of 65 %. The NST software program developed in the present study may enable more accurate estimation of blood origins in the analysis of bloodstain patterns found in a crime scene, and replace expensive, imported software programs, giving an economic benefit to scientific investigations performed in South Korea.