An Evidence‐Based Forensic Taxonomy of Windows Phone Communication Apps

Communication apps can be an important source of evidence in a forensic investigation (e.g., in the investigation of a drug trafficking or terrorism case where the communications apps were used by the accused persons during the transactions or planning activities). This study presents the first evidence‐based forensic taxonomy of Windows Phone communication apps, using an existing two‐dimensional Android forensic taxonomy as a baseline. Specifically, 30 Windows Phone communication apps, including Instant Messaging (IM) and Voice over IP (VoIP) apps, are examined. Artifacts extracted using physical acquisition are analyzed, and seven digital evidence objects of forensic interest are identified, namely: Call Log, Chats, Contacts, Locations, Installed Applications, SMSs and User Accounts. Findings from this study would help to facilitate timely and effective forensic investigations involving Windows Phone communication apps.     

Application of 3D Laser Scanner to Forensic Engineering

In the case of building collapses and overturned structures, a three‐dimensional (3D) collapse or overturn model is required to reconstruct the accident. As construction sites become increasingly complex and large, 3D laser scanning is sometimes the best tool to accurately document and store the site conditions. This case report presents one case of a structure collapse and one case of an overturned crane reconstructed by a 3D laser scanner. In the case of structural collapse of a prefabricated shoring system, a 3D model reconstructed all the members successfully, a task that is nearly impossible using a scale such as a tape measure. The reconstructed prefabricated shoring system was verified through a structural analysis through comparison with the construction drawings to investigate faults in construction. In the case of the overturned crane, the jib angle and other major dimensions were successfully acquired through 3D laser scanning and used to estimate the working radius. As a result, the propriety of the working radius with the given lifting load was successfully determined.     

Validation of Reduced Reagent Volumes in the Implementation of the Quantifiler® Trio Quantification Kit

The Quantifiler^® Trio Quantification Kit has been developed to quantify the total amount of amplifiable and human male DNA in samples and to estimate the extent of DNA degradation. To minimize the cost of DNA quantification, we evaluated kit performance using a reduced volume of reagents (1/10‐volume) using DNA samples of varying types and concentrations. Our results demonstrated concordance between the manufacturer's method and the low‐volume method for DNA quantification, DNA degradation index estimation, and human male DNA quantification. We confirmed the practical utility of the low‐volume method with 109 casework samples by evaluating short tandem repeat (STR) profiling success with respect to DNA quantity and quality. We also defined a cutoff value for DNA quantity to ensure reliable STR results. Using a reduced volume of reagents, 10 times more reactions per kit are possible; accordingly, this method reduces the cost of DNA quantification, while maintaining performance.     

Latent Fingermark Development on Thermal Paper using 1,2‐Indanedione/Zinc and Polyvinylpyrrolidone,

Polyvinylpyrrolidone (PVP) has been used in combination with 1,2‐indanedione (1,2‐IND) and ZnCl₂ (Zn) to develop latent fingermarks. The results show that the optimal ratio of 1,2‐IND/Zn:PVP is 1.0:0.4 (the concentration of PVP is 8%) for developing fingermark. The developed formulation was tested on the surfaces of 12 kinds of thermal papers. The variation in the fingermark development efficiency was observed within the same and among different kinds of thermal papers. The fingermark development efficiency was mostly better on the thermally sensitive surface compared to the thermally nonsensitive surface. However, similar or even better development was observed from a few thermally nonsensitive surfaces. The present method has shown better efficiency compared to the three other proposed methods on the thermally sensitive surface. In contrast, the present method was proven not the best for the thermally nonsensitive surface.     

Using Longitudinal Self-Report Data to Study the Age–Crime Relationship

Objectives

Given the growing reliance on longitudinal self-report data for making causal inferences about crime, it is essential to investigate whether the within-individual change in criminal involvement exists and is not a measurement artifact driven by attrition or survey fatigue—a very real possibility first identified by Lauritsen (Soc Forces 77(1):127–154, 1998) using the National Youth Survey (NYS). The current study examines whether the same threats to the validity of within-individual change in criminal involvement exist in the National Longitudinal Survey of Youth 1997 cohort (NLSY97).

Methods

We first estimate cohort-specific growth curve models of general crime, arrest, and substance use, and then test the difference between the age–crime curves of adjacent cohorts. We take a general approach to test cohort differences in the growth curve models, which advances the existing method separately modeling for each pair of adjacent cohorts. To explore the sources of cohort differences, we also estimate separate growth curve models by individual crime item and by demographic group.

Results

We document non-standard cohort differences between the age–crime curves of adjacent cohort pairs that are consistent with the findings of Lauritsen (1998) on measures of self-reported offending. However, the size of the cohort effects in the NLSY97 is substantially smaller than those in the NYS. We also found that the cohort effects were only evident in some of the survey items. Moreover, we did not identify any similar cohort issues in the longitudinal measure of arrest.

Conclusions

The findings of cohort effects localized in a certain crime items and demographic groups may mitigate concerns over the limited validity of longitudinal self-report data. We discuss how the survey techniques used in the NLSY97 might explain our findings and suggest an area of future study to explicate remaining cohort differences.

     

Bridal pregnancy and women’s educational attainment in South Korea, 1970–2009

We examine the link between marriage and fertility in South Korea by focusing on the historic trend of bridal pregnancy (marriage preceded by pregnancy) over the four decadal marriage cohorts since the 1970s. We first demonstrate how the rate of bridal pregnancy changes over the observed period and then investigate the educational differentials in the trend. These inquiries are examined by analyzing a sample of 29,213 ever-married Korean women from recently pooled data from the National Survey of Fertility and Family Health (NSFFH). The results show that bridal pregnancy has increased from 16% in the 1970s marriage cohort to 20% in the 2000s marriage cohort. In response to class differentials, while bridal pregnancy has been more prevalent among less-educated women than among their counterparts, bridal pregnancy has increased across all education groups over time. In addition, the magnitudes of increase are more noticeable among highly educated women of recent marriage cohorts. We contextualize our findings and provide speculations about subsequent family changes in South Korea.     

An Exploratory Framework for Community-Led Research to Address Intimate Partner Violence: a Case Study of the Survivor-Centered Advocacy Project

This case study discusses the Survivor-Centered Advocacy (SCA) Project, a community-based participatory research (CBPR) project that convened anti-violence advocates from culturally specific communities to design and implement research. The project used a unique approach to build grassroots research capacity and center survivors of intimate partner violence from historically marginalized communities. This approach coalesced into the creation of an exploratory Community-Led Research (CLR) framework that incorporated trauma-informed, research justice and language justice principles. The CLR framework responded to community members’ desire to lead, rather than simply participate in, the research process. As a result, five studies were designed and executed by practitioners turned community-based researchers, most of whom had never before engaged in research, except as subjects. The CLR framework integrated the skills and experiences of community-based and external researchers, and led to high levels of engagement, rich data, more equitable research processes and innovative research projects.     

The Role of Forensic Anthropology in the Examination of the Daegu Subway Disaster (2003, Korea)*

Abstract: Meticulous recovery of victims in the Daegu subway disaster was possible, because charred and fragmented victims were left in situ. Because bodies were piled one over another within the train, appropriate methodology during the recovery was critical to identifying the victims. The disaster area was thoroughly documented with notes, photographs, and schematic drawings of the various locations. The recovery team, comprising two medical examiners and one forensic anthropologist, decided when charred body parts and cremated bones were linked to the same individual based on the anatomy and forensic anthropological examination. Without these recovery procedures, it would not have been possible to efficiently harvest representative DNA sample from most of the victims’ body parts. After the entire process of identification, 136 victims were positively identified, and six victims remained unidentified. This study supports the crucial role of forensic anthropologists in the recovery of victims, especially in fire scenes.     

Microscopic Age Estimation from the Anterior Cortex of the Femur in Korean Adults*

Abstract: The purpose of this study was to develop age‐predicting equations from the anterior cortex of the femur of Korean adults. Seventy‐two femoral samples (44 male and 28 female) were obtained from Korean cadavers and used to develop the equations. The thin sections (<100‐μm thick) were prepared by manual grinding; the sections were not decalcified and were stained with Villanueva bone stain reagent. Analysis of covariance showed no significant differences in age‐adjusted histomorphological variables between sexes. In stepwise regression analysis, osteon population density, average osteon area, and the most anterior cortical width were selected for an age‐predicting equation which produced a high regression correlation (R² = 0.789). The average Haversian canal area was not significantly related to age for any specimen.