earticle

영어

Bloodstain pattern analysis is a forensic discipline that reconstruct events of a crime scene by analyzing sizes, shapes, distributions and positions of bloodstains. The objective of this research is to evaluate the errors in area of origin evaluations in the effect of parabolic orbit of blood droplets. We generated an impact spatter on the wall using a hammer and measured bloodstains with respect to distance. Then we calculate the area of the origin using Hemospat software. As results, for X-coordinate the rate of error was below 4 %. Estimated X-coordinates show random distribution compared with real x-coordinate. For Ycoordinate the rate of error was below 3 %. Estimated Y-coordinates show random distribution compared with real y-coordinate. For Z-coordinate, as the distance between the origin and the stain goes longer, the zcoordinate of the estimated origin goes higher because of the effect of parabolic motion of the blood droplet. Assuming trajectory was a straight line in the Hemospat software, but the real trajectory was parabolic. Thus the z-coordinate of the estimated area of origin was higher than the real coordinate. As the effect of parabolic motion was stronger, the estimated z-coordinate of the area of origin was higher than that of the real area of origin. We have a plan to develop the algorithm of finding the area of origin including the parabolic motion of blood droplets.