Portable high‐resolution automated 3D imaging for footwear and tire impression capture

The forensic science community raised the need for improved evidence recognition, collection, and visualization analytical instrumentation for field and laboratory use. While the 3D optical techniques for imaging static objects have been extensively studied, there is still a major gap between current knowledge and collecting high‐quality footwear and tire impression evidence. Among optical means for 3D imaging, digital fringe projection (DFP) techniques reconstruct 3D shape from phase information, achieving camera‐pixel spatial resolution. This paper presents a high‐resolution 3D imaging technology using DFP techniques dedicated to footwear and tire impression capture. We developed fully automated software algorithms and a graphical user interface (GUI) that allow anyone without training to operate for high‐quality 3D data capture. We performed accuracy evaluations and comparisons comparing with the commercial high‐end 3D scanner and carried out qualitative tests for various impressions comparing with the current practices. Overall, our technology achieves similar levels of accuracy and resolution with a high‐end commercially available 3D scanner, while having the merits of being (1) more affordable; (2) much easier to operate; and (3) more robust. Compared with the current practice of casting, our technology demonstrates its superiority because it (1) is non‐destructive; (2) collects more evidence detail than casts, especially when an impression is fragile; (3) requires less time and money to collect each piece of evidence; and (4) results in a digital file that can easily be shared with other examiners.     

Doing Nothing is Sometimes Worse: Comparing Avoidant versus Approach Coping Strategies with Peer Victimization and Their Association to Depression and Suicide Ideation

ABSTRACT

Peer victimization is a major stressor adolescents often face in the school environment, and has been linked to depression and suicidal risk. This study analyzed the associations between three behavioral coping strategies (avoidance, seeking social support from adults/peers, and retaliation) and depression and suicidal ideation. Participants included 4,254 victimized students who were part of the Saving and Empowering Young Lives in Europe (SEYLE) study that compared three school-based prevention interventions and collected information on health risk behaviors in adolescents from 11 European countries. Results showed behavioral avoidance to be associated with an increase in levels of depression, as compared to the other coping strategies (adult social support, peer social support, retaliation). Seeking social support from adults was associated with lower depression and suicidal ideation rates. A more than 25% increase in suicidal ideation was associated with behavioral avoidance, compared to seeking social support from adults. By contrast, retaliation to peer victimization was not found to be associated with increased depression or suicidal ideation. The findings support the Coping Deficit model and may suggest that abstaining by doing nothing when victimized can be associated with certain adverse emotional outcomes.     

Estimating Individual Contributions to Complex DNA SNP Mixtures.,

High‐throughput sequencing (HTS) of large panels of single nucleotide polymorphisms (SNPs) provides an alternative or complimentary approach to short tandem repeats (STRs) panels for the analysis of complex DNA mixture forensic samples. For STRs, methods to estimate individual contribution concentrations compare capillary electrophoresis peak heights, peak areas, or HTS allele read counts within a mixture. This article introduces three approaches (mean, median, and slope methods) for estimating individual DNA contributions to forensic mixtures for HTS/massively parallel sequencing (MPS) SNP panels. For SNPs, the major:minor allele ratios or counts, unique to each contributor, were compared to estimate contributor proportion within the mixture using the mean, median, and slope intercept for these alleles. The estimates for these three methods were typically within 5% of planned experimental contributions for defined mixtures.     

Learning from the “Milwaukee challenge”

The consequences of administering welfare-to-work programs through county-level agencies may be the most important issue omitted from current discussions of welfare reform. An administrative geography of county welfare agencies fragments metropolitan labor markets, consigning central county residents to job-poor areas and isolating them from job-rich suburban counties. This paper illustrates this effect by mapping employment/population shifts and administrative boundaries in metropolitan Milwaukee. The paper ends with the suggestion that county agencies be allowed to play variable rather than fixed functional roles in a labor exchange process that must now accommodate a metropolitan scale.     

Forced Migration Studies: Could We Agree Just to 'Date'?

This essay questions the soundness of a scholarly shift awayfrom ‘refugee studies’ in favour of ‘forcedmigration studies’. It contends, first, that subsumingrefugee studies into the broader framework of forced migrationstudies may result in a failure to take account of the specificityof the refugee's circumstances which are defined not just bymovement to avoid the risk of harm, but by underlying socialdisfranchisement coupled with the unqualified ability of theinternational community to respond to their needs. Second, itargues that forced ‘migration’ (rather than, forexample, forced ‘migrant’) studies encourages afocus on a phenomenon rather than on the personal predicaments,needs, challenges, and rights of refugees themselves. It maythus contribute to a lack of criticality in relation to policieswhich subordinate refugee autonomy to the pursuit of more systemicconcerns. The first concern is illustrated by reference to theemergence of the ‘internally displaced persons’category, the second by reference to the determination to findand mandate ‘durable solutions’ to forced migration,including to the movement of refugees.