Advanced carving techniques

Carving is the term most often used to indicate the act of recovering a file from unstructured digital forensic images. The term unstructured indicates that the original digital image does not contain useful filesystem information which may be used to assist in this recovery.Typically, forensic analysts resort to carving techniques as an avenue of last resort due to the difficulty of current techniques. Most current techniques rely on manual inspection of the file to be recovered and manually reconstructing this file using trial and error. Manual processing is typically impractical for modern disk images which might contain hundreds of thousands of files.At the same time the traditional process of recovering deleted files using filesystem information is becoming less practical because most modern filesystems purge critical information for deleted files. As such the need for automated carving techniques is quickly arising even when a filesystem does exist on the forensic image.This paper explores the theory of carving in a formal way. We then proceed to apply this formal analysis to the carving of PDF and ZIP files based on the internal structure inherent within the file formats themselves. Specifically this paper deals with carving from the Digital Forensic Research Work-Shop's (DFRWS) 2007 carving challenge.     

基因序列专利利益分享机制——基于“嘉拿芬”基因案

基因序列专利可能引发利益分享问题，以“嘉拿芬”基因案为例，运用实证分析、归纳分析的方法，从法理基础、人格法律基础、专利权归属一共三个方面论证了基因原材料提供者分享基因序列专利利益的可行性并提出了利益分享的实现方式。     

竖心旁笔顺判断方法

收集150份实验笔迹样本,由书写人报告样本字中竖心旁的笔顺。实验样本中出现了3种竖心旁的笔顺,在此基础上归纳了3种笔顺的判断规则。     

mtDNA测序结果与Anderson标准序列的比对－ClustalX等共享软件在法医物证学上的应用

目的 对多个样本的线粒体DNA(mtDNA)高变区测序结果与Anderson标准序列进行比对分析。方法 利用ABI测序仪测定生物学样本的mtDNA高变区序列,得到测序结果文件,通过Chromas、 SeqVerter软件将之转换为aln文件,用ClustalX软件与Anderson标准序列(txt文件)进行比对,确定突变点的碱基排列次序和位置。结果Chromas、SeqVerter和ClustalX软件界面友好,操作简便,可以方便地用于多个样本DNA序列的比较,结果直观,易于判读。结论　运用Chromas、SeqVerter和ClustalX等共享软件,可成功地对多个样本的mtDNA高变区序列进行比对分析。     

论汉字笔迹的笔顺特征——从书写动作系统性进行研究

笔顺特征是汉字笔迹特征的重要组成部分,是书写习惯动态关系的特点的重要表现形式,在笔迹鉴定中具有重要的价值。本文从书写动作系统出发,对笔迹的笔顺特征进行动态的、全面的分析,目的在于深入认识笔迹的笔顺特征及其价值,为笔迹特征系统的完善和科学的运用提供理论依据。     

环境公益诉讼起诉主体的顺位设计刍议

起诉资格是环境公益诉讼得以启动的关键,建立在起诉资格前提之上的起诉主体顺位设计是对最优起诉主体的探寻,在避免司法资源浪费、协调诉权冲突以及保障环境公益诉讼实施效果等方面均有所裨益.通过最强公共利益标准与诉讼经济标准的衡量,将检察机关定位为环境公益诉讼的第一起诉顺位,环保社会组织和公民分列第二、三位.对环境公益诉讼顺位设计标准的把握应当灵活,契合当下环境公益诉讼的发展实践.不同顺位之间的环境公益诉讼起诉主体应相互协作,合力推动环境公益诉讼的司法救济功能的实现.     

A Sequence Analysis of Nonverbal Behaviour and Deception

The ability to correctly interpret nonverbal communication (NVC) is an important ability in everyday interactions, which may use NVC techniques to identify the concealment of information. In the present study, a novel approach was used to understand NVC. Behaviour sequence analysis identified specific sequences of behaviours that indicate psychological distress caused by deception. The study involved the analysis of 55 videos of real criminals and high-power individuals that were filmed fabricating statements, which were later exposed as being untruthful at the time of being filmed. In addition, 53 clips of criminals making truthful statements were also analysed as a contrast group. Results indicated clear differences between honest and deceptive responses, such as furrowing of eyebrows in the deceptive sequences occurring more often than honest statements. In addition, sequences of behaviours were shown in the present data set, which could indicate a new method for analysing NVC and detecting psychological distress caused by deception. The possible implications and applications for police and forensic investigation are also outlined.     

Empirical Determinants of Bicameral Sequence in State Legislatures

In a previous article (Rogers 1998), I showed that the bicameral chamber that originates enacted legislation tends to realize policy outcomes closer to the preference of its median legislator than does the chamber that votes second on legislation. All things being equal, this “first‐mover advantage” implies that each chamber could be expected to originate roughly half of all enacted legislation. But all other things are not equal in U.S. state bicameral legislatures. Drawing on an expanded dataset, I innovate and test a number of additional hypotheses related to bicameral voting sequence. My results account for the effects of constitutional, institutional, and electoral variables on bicameral sequence.     

入字笔顺识别方法

目的 建立入字笔顺的科学识别方法.方法 收集实验笔迹样本分别作为训练样本和测试样本,由书写样本的被试者报告目标字的笔顺,依据训练样本提取入字的形态特征,在特征基础上建立分类器,使用测试样本评估分类器的性能.结果 共获得352份有效样本,被试者报告了2种入字笔顺,提取撇笔收笔动向等形态特征,拟定判别函数,建立判别规则,由测试者对识别方法进行测试.结论 建立了入字笔顺的识别方法,对于测试样本,拒识率为11.4％,测试错误率为4.6％.     

Preventive-maintenance techniques for staying union-free

Maintaining union-free status is a matter of maintaining credibility with your employees in five key areas: management development, employee training, promotion, compensation and benefits, and communications. The latter two concerns are particularly stressed by Dr. Rand in this low-cost, high-return strategy.     

Detection of drug transport using X-ray techniques

The purpose of the paper was to show X-ray techniques used to discover drugs transported inside the body (body packers), on the body surface, in the garments or luggage, in goods and vehicles. The analysis was based on the X-ray findings of 141 body packers caught in Hamburg between 1989 and 2004 as well as individual cases from personal collections. The use of X-rays for border and security checks is described, different technical concepts are demonstrated and examples are given, e. g. transmission (fluoroscopic) and backscatter imaging of humans, luggage, goods, and vehicles as well as X-ray spectroscopy. The results showed that body packers produce characteristic findings in native X-ray photographs, which are even more pronounced in CT scans and after application of contrast media. Backscatter imaging allows the investigation of the body surface and the clothing. Transmission and backscatter imaging is suitable for checking humans, goods, passenger cars, trucks and containers. With the help of X-ray spectroscopy suspicious substances can be identified without opening the packaging material. According to present findings, the radiation dose applied seems low compared with exposure to environmental radiation and cosmic radiation during flights. The pictures obtained with the backscatter technique show the person checked in the nude, which raises the question of privacy versus the right of the state to carry out inspections and controls.     

Evaluation of pediatric skull fracture imaging techniques

Radiologic imaging is crucial in the diagnosis of skull fracture, but there is some doubt as to whether different imaging modalities can accurately identify fractures present on a human skull. While studies have been performed to evaluate the efficacy of radiologic imaging at other anatomical locations, there have been no systematic studies comparing various CT techniques, including high resolution imaging with and without 3D reconstructions to conventional radiologic imaging in children, we investigated which imaging modalities: high-resolution CT scan with 3D projections, clinical-resolution CT scans or X-rays, best showed fracture occurrence in a pediatric human cadaver skull by having an expert pediatric radiologist examine radiologic images from fractured skulls. The skulls used were taken from pediatric cadavers ranging in age from 5 months to 16 years. We evaluated the sensitivity and specificity for the imaging modalities using dissection findings as the gold standard. We found that high-resolution CT scans with 3D projections and conventional CT provided the most accurate fracture diagnosis (single-fracture sensitivity of 71%) followed by X-rays (single-fracture sensitivity of 63%). Linear fractures outsider the region of the sutures were more identifiable than diastatic fractures, though the incidence of false positives was greater for linear fractures. In the two cases where multiple fractures were present on the same anatomical skull location, the radiologist was less likely to identify the presence of additional fractures than a single fracture. Overall, the high-resolution and clinical-resolution CT scans had the similar accuracy for detecting skull fractures while the use of the X-ray was both less accurate and had a lower specificity.     

Review of analytical techniques for arson residues

Arson is a serious crime that affects society through cost, property damage, and loss of life. It is important that the methods and technologies applied by fire investigators in detection of evidence and subsequent analyses have a high degree of reliability, sensitivity, and be subject to rigorous quality control and assurance. There have been considerable advances in the field of arson investigation since the 1950s. Classification of ignitable liquids has been updated to include many new categories due to developments in the petroleum industry. Techniques such as steam or vacuum distillation and gas chromatography (GC) with flame ionization detection that may have been considered acceptable--even a benchmark--40 years ago, are nowadays generally disfavored, to the extent that their implementation may almost be considered as ignorance in the field. The advent of readily available mass spectrometric techniques has revolutionized the field of fire debris analysis, increasing the degree of sensitivity and discrimination possible considerably. Multi-dimensional GC--particularly GC x GC--while not yet widely applied, is rapidly gaining recognition as an important technique. This comprehensive review focuses on techniques and practices used in fire investigation, from scene investigation to analysis.     

书写时间确定技术的国内现状与发展

综述了书写时间确定技术在国内的现状及最新发展,主要从三方面进行了介绍:水溶性书写时间确定技术;圆珠笔油墨书写时间确定技术;间接确定文件的书写时间方法。     

Comparison of modern techniques for saliva screening

Saliva stains present a unique challenge in the forensic setting, often challenging the analyst to weigh the value of presumptive indication of the fluid versus the potential for DNA analysis to yield identification information. There are many situations in which determining the presence of a body fluid is probative and further corroborates DNA evidence. That said, even a minute portion of sample consumed by a screening test could mean the difference between a full, partial, or null profile obtained through DNA analysis. The basis of presumptive testing or screening of saliva has historically been based on the presence of amylase, a component found in relatively high concentrations in human saliva versus other body fluids and substances. Though the current available methods for the screening of saliva in a forensic application have grown in number, the popularity of these methods seemingly has not. This study attempts to identify a specific and sensitive saliva screening test by comparing three modern techniques--the recently released SALIgAE, Phadebas, and starch-iodine mini-centrifuge test--on the basis of sensitivity, specificity, mixtures, and simulated casework samples while also considering sample consumption. The Phadebas method for presumptive saliva testing detected dilutions of neat saliva down to 1:200 versus considerably less sensitive results with SALIgAE and the starch-iodine mini-centrifuge test. Utilizing a screening test with a high degree of sensitivity, such as Phadebas, allows an analyst to gain a maximum amount of information in the form of body fluid indication and DNA results because of the consumption of a small portion of sample.     

人与动物mtDNA细胞色素b基因的序列差异

目的 探讨人与动物之间mtDNA细胞色素b(Cyt-b)基因序列差异及其种属鉴定。方法 采用1对Cyt-b基因通用引物对人和19种动物共171例样本的mtDNA进行PCR扩增,琼脂糖凝胶检测扩增产物,ABI 377测序仪及荧光测序技术分析扩增产物的DNA序列。结果 所有样本均检测到1条358bp的扩增片段;任何两种动物扩增片段的序列都不相同,人与19种动物的序列差异在18.9％-30.0％,19种动物之间的序列差异在5.9％-32.9％。同种动物不同个体间只有人、驴及小白鼠存在变异,最多有4个碱基变异位点(1.3％),其它动物未发现种内变异。结论 人与不同种动物的Cyt-b基因序列存在差异,以此可区分不同种属的动物。     

门字框笔顺的判断方法

通过实验研究门字框笔顺判断的科学方法,收集155份实验笔迹样本,由书写人报告样本字中门字框的笔顺。分析门字框的笔迹形态与规范笔顺、通用笔顺的关系,发现点笔搭配位置,竖笔和点笔的收笔动向可以作为判断笔顺的可靠依据,根据点笔位置、竖笔和点笔收笔动向的规律,得出了门字框规范笔顺和通用笔顺的判断规则。     

书写方向对笔顺和笔径的影响

以反犬旁、山字为目标字,收集了1178份有效笔迹样本,其中反犬旁常见笔顺样本954份,当用常见笔顺书写反犬旁时,第一个撇笔有正反2种笔径,分性别检验山字笔顺与反犬旁第一撇的笔径的相关性,用似然比测定其相关程度。字的书写方向因子可以解释山字笔顺与反犬旁笔顺、笔径相关的结果,研究结果支持了书写能力结构的因子假说。     

脱落毛发线粒体DNA HV1区序列测定的研究

目的　对脱落毛发线粒体DNAHV1区序列测定方法进行研究。方法　嵌合扩增结合末端荧光标记DNA测序。结果　对 2 0例脱落毛发进行分析获得了明确的测序结果 ,与来自同一个体的血液所测得的DNA序列进行比较 ,完全相同。结论　嵌合扩增在对脱落毛发进行线粒体DNA多变区序列分析中是一种有效的方法 ,在法医DNA检验中具有实用价值。