An innovative method for human height estimation combining video images and 3D laser scanning

Digitalization has increased the number of video surveillance systems that sometimes capture crime images. Traditional methods of human height estimation use projective geometry. However, sometimes they cannot be used because the video camera surveillance system is not available or has been moved and there are no reference lines on the frame. Scientific studies have developed a new method for human height estimation using 3D laser scanning. This model necessarily requires a series of approximations, which increase the final measurement error. To overcome this problem, in the present study, images of a subject are projected directly on the 3D model, estimating the height of the subject. This article describes the methodological approach adopted through the analysis of a real case study in a controlled environment executed by Carabinieri Forensic Investigation Department (Italy). The aim is to obtain a human anthropometric measure derived from frames extracted from the videos associated with the digital survey of the framed area obtained with 3D laser scanning and point cloud analysis. The result is the height estimation of five subjects filmed by a camera obtained through the combination of 2D images extracted by a DVR/surveillance systems with 3D laser scanning. Results show that most estimated measurements are less than the real measurement of the subject; it also depends on the posture of the subject while walking. Furthermore, results shows the differences between the real height and the estimated height with a statistical approach.     

The Pivot to Asia,Air-Sea Battle and contested commons in the Asia Pacific region

Abstract

The Pivot towards the Asia Pacific has been a key component of the grand strategy of the Obama administration. Militarily, the main challenge is represented by the Chinese capacity to erode the American ‘command of the commons’.

The United States have been developing a new operational concept, labelled ‘Air-Sea Battle’ (ASB) aimed at maintaining the capacity to project military power even if adversaries are able to deploy a sophisticated anti-access area denial strategy.

The implementation of ASB is likely induce Beijing to respond with a further acceleration of the process ofmodernisation of its armed forces.     

Open access, social norms and publication choice

The aim of this paper is to shed light on scholarly communication and its current trajectories by examining academics’ perception of Open Access, while also providing a reference case for studying social norm change. In this respect, the issue of publication choice and the role of Open Access journals casts light on the changes affecting the scientific community and its institutional arrangements for validating and circulating new research. The empirical investigation conducted also offers a useful vantage point for gauging the importance of localised social norms in guiding and constraining behaviour.     

The Invisibility of Wage Employment in Statistics on the Informal Economy in Africa: Causes and Consequences

Abstract

This article challenges the claim, along with the statistics that support it, that self-employment is by far the dominant employment status in the informal economy. The article begins by reviewing key insights from relevant literature on the informal economy to argue that conventional notions of ‘wage employment’ and ‘self-employment’, while unfit for capturing the nature and variety of employment relations in developing countries, remain central to the design of surveys on the workforce therein. After putting statistics on Tanzania’s informal economy and labour force into context, the analysis reviews the type of wage employment relationships that can be found in one instance of the informal economy in urban Tanzania. The categories and terms used by workers to describe their employment situation are then contrasted with those used by the latest labour force survey in Tanzania. The article scrutinises how key employment categories have been translated from English into Swahili, how the translation biases respondents’ answers towards the term ‘self-employment’, and how this, in turn, leads to the statistical invisibility of wage labour in the informal economy. The article also looks at the consequences of this ‘statistical tragedy’ and at the dangers of conflating varied forms of employment, including wage labour, that differ markedly in their modes of operation and growth potential. Attention is also paid to the trade-offs faced by policy-makers in designing better labour force surveys.     

Social contention,authoritarian resilience,and political change

This article takes stock of recent advances in the field of comparative authoritarianism. The four books reviewed shed light on the effects of social activism, claim-making and social protests on authoritarian resilience. Taken as a whole, they intervene in the scholarly debates that examine the rise of collective, often contentious action under authoritarian rule. In so doing they account both for how states tolerate or even encourage collective action and the extent to which, in turn, protests by distinct social groups re-shape the political system. As authoritarian institutions, democratic-looking or otherwise, have received considerable attention of late, this article calls for greater attention to the economic and ideational dimensions of authoritarianism and, more generally, a broader research agenda.     

False-negative probability in the SEM/EDS automated discovery of iGSR particles: A Bayesian approach

The automated search software integrated with a scanning electron microscope (SEM/EDS) has been the standard tool for detecting inorganic gunshot residues (iGSR) for several decades. The detection of these particles depends on various factors such as collection, preservation, contamination with organic matter, and the method for sample analysis. This article focuses on the influence of equipment resolution setup on the backscattered electron images of the sample. The pixel size of these images plays a crucial role in determining the detectability of iGSR particles, especially those with sizes close to the pixel size. In this study, we calculated the probability of missing all characteristic iGSR particles in a sample using an SEM/EDS automated search and how it depends on the image pixel resolution setup. We developed and validated an iGSR particle detection model that links particle size with equipment registers and applied it to 320 samples analyzed by a forensic science laboratory. Our results show that the probability of missing all characteristic iGSR particles due to their size is below 5% for pixel sizes below 0.32 μm². These findings indicate that pixel sizes as large as twice the one commonly used in laboratory casework, that is, 0.16 μm², are effective for initial sample scanning, yielding good detection rates of characteristic particles that could exponentially reduce laboratory workload.     

Violence in school: An investigation of physical,psychological, and sexual victimization reported by Italian adolescents

In Italy, numerous studies have been carried out regarding the phenomenon of bullying; however, studies on single incidences of sexual, physical, and psychological victimization at school remain scant. Therefore the aim of this study is to examine the phenomenon of scholastic violence with a broader perspective, as well as all the possible perpetrators including adults. The sample consisted of 277 adolescents (64% female), ranging from grade 6th to 13th (mean age = 13.29, SD = 2.19). Sixty-four percent of the participants were middle school students, the remaining were high school students. Results show that the most commonly reported type of victimization is psychological violence (incidence= 77%), followed by physical (incidence= 52%), and sexual victimization (incidence= 24%). These forms of violence are mainly inflicted by peers. The research confirmed the validity of the tool and its applicability in the Italian context for screening violent behavior at school.     

The US Government and the Italian coup manqué of 1964: the unintended consequences of intelligence hierarchies

In the summer of 1964, Italian security forces and the President of the Republic attempted to remove the US-backed Italian center-left government. The attempt did not succeed, but the threat to do so was used to curtail the government’s reformist program. This article shows that the State Department and the CIA misunderstood the plans of the Italian President and security officers, dismissing the possibility of a forceful removal of the center-left, despite having a long-standing hierarchical relationship with Italian intelligence. US officials failed because of poor analytic tradecraft and because of two unintended consequences of international intelligence hierarchies: an excessive reliance on liaison over penetrations and the increased freedom of maneuver of Italian intelligence when faced with multiple, competing principals.