Improved Area of Origin Estimation for Bloodstain Pattern Analysis Using 3D Scanning

An important component of crime scene reconstruction is bloodstain pattern analysis (BPA). Where BPA concerns impact patterns, estimating the area of origin is critical information for scene reconstruction. Traditionally, this is achieved by measuring individual bloodstains and performing trigonometric calculations; however, 3D scanning has been proposed as a viable alternative for overcoming logistical and practical concerns with the manual method. Therefore, this project aimed to establish whether the FARO Focus 3D scanner and FARO Zone 3D software can improve the accuracy of area of origin estimates relative to the manual method. We created a series of eight bloodstain impact patterns and performed paired analysis using the two methods to estimate areas of origin for each pattern. Our data suggested that FARO-derived estimates were generally more accurate than using the manual method. FARO-estimated heights of origin areas were generally closer to the true distance. Both methods underestimated the distance from the wall for most patterns originating 150mm or greater from the wall, but overestimated distances for patterns originating closer to the wall. The degree to which distances were underestimated increased significantly the further the blood source was from the wall and was greater for FARO-derived estimates. The results of this research contribute to the validation of these instruments for operational implementation for BPA and should be considered alongside the practical benefits of 3D scanning relative to manual methods. Further, 3D scanning can provide reliable BPA reconstruction documentation for technical review and court presentation.     

Two-dimensional metric comparisons between dynamic bare footprints and insole foot impressions-forensic implications

Footwear may be found at crime scenes as physical evidence. Such footwear often has impression features of the wearer’s foot on the insole of the shoe. Scientific research and literature have established that footprints are distinct. This study compares two-dimensional measurements on bare footprints to foot impressions on insoles to determine if significant differences or similarities exist. Dynamic footprints were collected from 51 donors using the Identicator® Inkless Shoe Print Model LE 25P system. Seven foot length and width measurements were taken based on the Reel linear measurement method. Footprint measurements between bare footprints and foot impressions on the insoles were compared. Only two differences (p > 0.05) were observed between the various bare footprint and insole foot impression measurements on the right and left side for most of the measurements, CALC (p < 0.001) and A1 (p = 0.04). Bare footprint and insole A5 measurements on the left side were also significantly different (p = 0.015). The results of the study have implications in the forensic analysis of foot impression evidence on insoles in footwear in assisting with identifying the wearer of said footwear. Situations may arise in the forensic context when comparing the foot impression on the insole of footwear to a suspect’s bare footprint or a footprint from post-mortem remains. This study contributes to the scant literature available on the topic and to understanding the similarities and differences observed in the various linear measurements that may be utilized in the comparison process of footprint impressions on shoe insoles to bare footprints.     

论招录培养体制改革中的公安院校实践教学

公安院校招录培养体制改革试点工作已经正式启动。公安部试点工作文件中明确提出,应以培养和造就政治业务素质高,实战能力强的应用型、复合型专门人才为目标,更加注重专业特色和职业能力的培养。在公安院校招录培养体制改革背景下．公安教育工作者应该对公安院校的实践教学进行深入的思考。     

浅谈职业院校日语教学质量的提高

为适应社会对外语人才高质量的要求,高校日语教学除保留传统教学的优势之外需要采取新的教学方式,加强日语基础知识教育的同时,把语言学习和文化学习相结合,培养学生的语言交际能力、大胆实践口语、增强独立学习的能力,以培养适应社会发展的综合型人材。     

高职院校艺术设计专业教学模式浅析

高职院校艺术设计专业教育应该强调以学生就业为导向,从专业教育的培养目标、课程设置、教师职能的发挥以及实践基地建设等入手,进一步加强教学模式的改革,因为教学模式改革已成为高职艺术设计专业发展的必然趋势。     

高职中药专业《基础化学》课程教学改革的探索

《基础化学》是高职院校中药专业必不可少的一门专业基础课,笔者通过教学实践体会到高职中药专业《基础化学》课程教学必须转变教育思想,强调实践,突出应用,重新设计课程体系,优化精选教学内容,改进教学方法和手段,才能培养出合格的高职应用技术型人才。     

模拟情景教学法在《现场急救》课程中的应用

选择公安院校学习现场急救课程的72名学生随机分成2组：实验组与对照组,分别采取模拟情景教学法和传统教学法针对同一个内容组织教学,并对理论和实验成绩进行统计分析,然后对模拟情景教学法在现场急救中的应用效果进行评估。结果表明：理论成绩两组无显著差异,实验成绩实验组优于对照组。结论：模拟情景教学法在现场急救中的应用,有助于培养学生团队精神及综合分析解决问题的能力,并能提高学生的现场救护决策能力,同时也极大地提高了学生的学习热情和学习兴趣。     

问题教学法的实践与思考

运用问题教学法需要技巧并坚持一定的原则,只有这样才能取得良好的教学效果,学生才能从中受益。     

英语文化渗透式教学的实践与探讨

语言与文化具有紧密的联系。英语教学不应以通过考试为目的,而应注重提高实际生活中运用语言能力和交际能力。本文强调教学过程中应加强文化的渗透,利用多种渠道使学生了解中西文化的差异,并对英语教学中应注意的问题进行分析和探讨。     

天然药物化学课程教学方法的探讨

随着当前对天然药物开发研究的不断深入,天然药物化学课程的重要性也越来越受到重视。而传统的天然药物化学教学方式多为教师讲授,学生被动地听、甚至靠死记硬背,学生的学习兴趣没有得到激发,效率不高,普遍反映枯燥难学。因而全面提高天然药物化学的学习水平和教学质量具有重要意义。为此,作者结合自己的教学经验谈一些感受。