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.     

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.     

Does Political Information Matter? An Experimental Test Relating to Party Positions on Europe

This article focuses on whether the provision of 'objectively' correct information to voters about where parties stand on an issue affects their placement of the parties, and ultimately their own position, on that issue. Classic theories of how mass publics make voting decisions assume that voters are able relatively accurately to place themselves and the parties on various issue dimensions. While these assumptions have been challenged, it is generally assumed that the provision of new information makes voters' placements more informed. We explicitly test this idea using a survey experiment focusing on one political issue – European integration. In the experiment, all respondents were twice asked to place the three main British parties and themselves on a bipolar scale of European integration. This was done towards the beginning, and then at the end of the survey. Most respondents were also given information on the 'informed' positions of the parties, derived from expert survey placement. Our analyses indicate that individuals' placements did change, and the tendency was related to both political sophistication and the inherent difficulty of placing the party. Only less sophisticated voters updated their placements, and these changes are concentrated on the placement of the Labour party, where the elite stance on Europe has been more conflicted. For all respondents we do not detect any corresponding changes in self-placement that would be congruent with 'cueing' effects.     

Liberal Justifications for Local Government in Britain: The Triumph of Expediency over Ethics

It is shown in this article how theories justifying local government in Britain are largely based on the expedience of providing administrative efficiency or stable democracy for the central state rather than ethical grounds that justify local government as an independent entity in its own right. The article critically reviews the development of theories justifying local government within Britain and argues that it is possible on the basis of Mill's arguments within On Liberty to establish a strong ethical justification for local government. It is shown how Mill did not develop this line of thought but established substantive arguments concerning the value of local government for securing a stable liberal democracy and how successive mainstream theorists have modified but not substantially departed from this approach.     

The political economy of IMF forecasts

We investigate the political economy of IMF forecasts with data for 157 countries (1999–2005). Generally, we find evidence of forecast bias in growth and inflation. Specifically, we find that countries voting with the United States in the UN General Assembly receive lower inflation forecasts as domestic elections approach. Countries with large loans outstanding from the IMF also receive lower inflation forecasts, suggesting that the IMF engages in “defensive forecasting.” Finally, countries with fixed exchange rate regimes receive lower inflation forecasts, suggesting the IMF desires to preserve stability as inflation can have detrimental effects under such an exchange rate regime.     

Opinion Taking within Friendship Networks

Communication within friendship networks can provide gains in efficiency that help individuals enrich their understanding of politics. Through two panel survey experiments, we demonstrate that the dissemination of an individual's opinion about the hazards posed by public policies can have both durable and significant effects on the policy judgments of friends. These effects are conditioned by both the content of the communication and the recipient's level of political awareness. Opinions emphasizing potential risks carry more weight than those that attempt to alleviate concerns about potential risks. Moreover, opinion transmission is more effective for subjects who are less politically aware when policy issues are salient; but when the political issue is more esoteric, friends who are more politically aware evidence greater opinion change.     

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.