Medico-legal Analysis of the Head Injuries Using Computer Simulation

1. 人类头部的计算机模拟。为了研究头部颅内空间各点受到冲击力时加速度和压力的变化，我们利用数学模型对头部进行了计算机模拟。为了完成这项研究，我们制作了一个弹性动力学模型，其中分别确定了颅骨和大脑的一个常数。我们利用有限元法计算了头部颅内间隙处的加速度和压力的结果。使用头部和颈部的物理模型进行击打和坠落实验。在两个实验中，给予枕中区域相同大小的冲击力。两种实验中撞击部位的颅内压均为正，且颅内压的大小在两种实验中无显著差异。在两个实验中，撞击对面的一个都是负的，更大的一个几乎是相同的。跌落实验的颅内压持续时间在撞击部位和对侧部位均比击打实验的颅内压持续时间长，尤其是对侧部位。在使用重锤击实验和一盏灯一个冲击力的大小是一样的,力和加速度的影响的持续时间更长比光一个重锤,和颅内压的大小影响站点和相反的网站越来越颅内压的持续时间在两个站点是短重比光one.3之一。撞击、坠落、跌落致死病例头部损伤的研究。在击打中，头部的外侧区域经常受到冲击，而在几乎所有摔倒的病例中，头部的后部区域都受到冲击。政变挫伤比打击挫伤更容易造成，而冲突挫伤比政变挫伤更容易造成跌倒和跌倒，尤其是跌倒。在击打时常观察到凹陷性或社区性骨折，在跌倒时常观察到线状骨折。少

1. Computer Simulation of a Human Head. To investigate a change of the acceleration and the pressure at the each point of the intracranial space of the head which incurred an impact force, we made up a computer simulation of the human head using a mathematical model. For the purpose of achieving this study, we made an elasticodynamic model in which a constant of the skull and one of the brain were determined respectively. We made use of the Finite Element Method to compute the results of the acceleration and pressure at the site of the intracranial space of the head.2. Blow and Fall Experiment using a physical model of the head and neck.The same magnitude of the impact force was given to the median occipital region in both the experiments. The intracranial pressure at the impact site was positive in both the experiments and the magnitude of the pressure was not significantly different between them. The one at the opposite site of the impact was negative in both the experiments and the … More magnitude of it was almost the same. The duration of the intracranial pressure was longer in the fall experiment than in the blow experiment at both the impact site and the opposite site, especially at the opposite site. In the blow experiments using a heavy hammer and a light one in which the magnitude of the impact force was the same each other, the duration of the impact force and the acceleration was longer in the heavy hammer than in the light one, and the magnitude of the intracranial pressure at both the impact site and the opposite site was greater and the duration of the intracranial pressure at both sites was shorter in the heavy one than in the light one.3. Studies on Head Injuries in the Fatal Cases by Blow, Fall and Fall Down.In blows a lateral region of the head was frequently impacted and a posterior region was in the almost all cases of falls down. The coup contusions were more easily caused than the contrecoup contusions in blows and the contrecoup contusions were more easily done than the coup contusions in falls and falls down, especially falls down. Depressed or communited fractures were often observed in blows and linear fractures were in falls down. Less