Empirical Evaluation of the Reliability of Photogrammetry Software in the Recovery of Three-Dimensional Footwear Impressions

This paper examines the reliability of Structure from Motion (SfM) photogrammetry as a tool in the capture of forensic footwear marks. This is applicable to photogrammetry freeware DigTrace but is equally relevant to other SfM solutions. SfM simply requires a digital camera, a scale bar, and a selection of oblique photographs of the trace in question taken at the scene. The output is a digital three-dimensional point cloud of the surface and any plastic trace thereon. The first section of this paper examines the reliability of photogrammetry to capture the same data when repeatedly used on one impression, while the second part assesses the impact of varying cameras. Using cloud to cloud comparisons that measure the distance between two-point clouds, we assess the variability between models. The results highlight how little variability is evident and therefore speak to the accuracy and consistency of such techniques in the capture of three-dimensional traces. Using this method, 3D footwear impressions can, in many substrates, be collected with a repeatability of 97% with any variation between models less than ~0.5 mm.     

Development of a Novel Finger-Trigger Interface for Trigger Pull Measurement

Trigger pull is the force that needs to be exerted on the trigger to discharge a firearm. The measurement of trigger pull can assist in the evaluation of the safety, function, and manufacturing characteristics associated with a firearm during the forensic firearm examination process. Nonetheless, the accuracy and uncertainty of trigger pull measurements may be affected by the measuring device, test procedure, and environmental conditions. In this work, an innovative finger-trigger interface device was developed to facilitate accurate trigger pull measurements. The idea was to reduce the variation related to the position of the measurement device on the trigger in existing measuring methods and devices. Three force sensors based on different technologies were initially evaluated. While two of the three sensors failed to produce data, the miniature capacitive plate sensor exhibited high precision and a linear response over the range of typical trigger pulls. To examine the effects of the finger-trigger interface on trigger pull measurement, different sensor housing prototypes were designed in silico and 3D printed for the construction of three finger-trigger interface devices. The performance of each finger-trigger interface device was evaluated by measuring the trigger pulls of several selected firearms and comparing the data to a previously published study. Our preliminary results demonstrated the novel finger-trigger interface device offered a new way to measure trigger pull in situ with acceptable accuracy and precision.     

大国博弈、双层均势的亚洲时刻--俄罗斯智库对中美经贸摩擦的认知与政策立场

俄罗斯智库对中美经贸摩擦有着独特的认知和期待,并与克里姆林宫的官方立场互为表里。总体上,俄方智库的观点是,在经贸摩擦的背后,是中美两国对军事、政治、科技、地区和全球领导权的竞争;两国的国内议程和对外政策,将因此受到深远影响并产生溢出效应--在亚洲区域内形成两极结构。即使两国会因国内和国际政治因素,在经贸问题上达成妥协,但中方不会放弃获得世界科技领导者的雄心,美方也不会打消遏制中国发展动能的战略意图。俄罗斯应与中国继续保持经济与军事合作,避免与美国和西方关系的继续恶化,并在亚太地区推动"大欧亚伙伴关系"倡议。俄罗斯政策分析界基于自身利益的演绎,将中美经贸摩擦定性为大国博弈,相应的政策建议反映出俄罗斯以在全球和亚洲分别制衡美中为目标的双层均势策略。俄罗斯将在有亚洲其他国家参与的情景下扮演战略平衡手角色,借中美全面对抗之势,在中美俄三边关系之外扭转不利的外部发展环境。俄罗斯对亚太国际局势的盘活作用,将催生双边和三边竞合新模式的建立。     

"堰塞湖"型社区治安管理模式探析 ——以北京市崔各庄东辛店村为例

基层治,则天下安。在新型城镇化纵深推进大背景下,对流动人口住处的疏解整治成为解决"大城市病"的必要手段,但实践中拆迁整治引发了"堰塞湖效应","堰塞湖效应"使得流动人口流入地社区演变成"堰塞湖"型社区。对此类社区的治安管理应革新以往防范式治安管理模式,有针对性地构建社区治安问题"审视→分析→反应→评估"的治安管理模式,根据"堰塞湖"型社区治安问题产生的原因及管理困境,形成一套从宏观到微观的逻辑严谨、运行有序的治安管理体系。具体可从树立"善治"和"共治"治安管理理念、促进流动人口社区融合和社区治安资源整合等方面入手解决"堰塞湖"型社区治安问题,以维护社区安全稳定。     

从十六大到十七大：中国共产党党内民主的逻辑演绎进程

党的十六大以来,从提出“党内民主是党的生命”到“要以扩大党内民主带动人民民主,以增进党内和谐促进社会和谐”的论断,中国共产党在新的历史条件下,根据世情、国情、党情的变化和新形势新任务对党的建设提出的新要求．把推进党内民主建设作为保持和发展党的先进性和加强党的执政能力的一项根本性建设,以改革创新的精神积极发展党内民主,在理论和实践上取得了重要进展。     

Consolidating ZIP Codes for Small Area Fair Market Rents: A Method for Implementing the New Rule

Fair Market Rents (FMRs), calculated for an entire metropolitan region, are used to establish payment standards for the Housing Choice Voucher (HCV) program. In response to recent criticism that FMRs do not represent rent disparity and restrict households from moving to high-opportunity areas, a new rule introducing Small Area Fair Market Rents (SAFMRs) has been issued. SAFMRs are based on ZIP codes to reflect local market rents and increase the number of payment standards used to administer the HCV program. The purpose of this research is to determine whether the number of payment standards can be reduced by consolidating ZIP codes, while adhering to the primary objectives of the SAFMR rule. The ZIP code grouping process conducted offers one method for reducing the number of payment standards needed to implement the new rule; however, the rent analysis reveals the over- and underestimation of SAFMRs for some ZIP codes.     

Fund Accounting from the Italian Early Tradition to the U.S. GAAP for Governments

Surprising correspondences emerge from the parallel investigation of fund accounting practices in Italian entities until the late nineteenth century and in the contemporary U.S. public sector. The analysis attempts to interpret similarities and differences in light of dissimilar environmental features, and wonders if the Italian tradition could have some explanatory capability on the U.S. present standards. The “fund” concept and its use are strictly similar; they are founded on information needs for governance and internal control. Contemporary requirements for democracy and transparency, and opportunities coming from modern ICT tools bring U.S. organizations to be accountable to the citizenry.     

Does online voting change the outcome? Evidence from a multi-mode public policy referendum

Do online and offline voters differ in terms of policy preferences? The growth of Internet voting in recent years has opened up new channels of participation. Whether or not political outcomes change as a consequence of new modes of voting is an open question. Here we analyze all the votes cast both offline (n = 5.7 million) and online (n = 1.3 million) and compare the actual vote choices in a public policy referendum, the world's largest participatory budgeting process, in Rio Grande do Sul in June 2014. In addition to examining aggregate outcomes, we also conducted two surveys to better understand the demographic profiles of who chooses to vote online and offline. We find that policy preferences of online and offline voters are no different, even though our data suggest important demographic differences between offline and online voters.     

The Characteristics and Unmet Housing Program Needs of Disabled HUD-Assisted Households

The mismatch between the housing needs of persons with a disability and the housing programs designed to accommodate those needs is an important housing policy concern. The U.S. Department of Housing and Urban Development (HUD) sponsors several programs designed to improve the housing conditions of persons with a disability, but we know little about the characteristics of persons with a disability, among those receiving federal housing assistance, or the degree to which persons with a disability are served by HUD-sponsored housing programs that are designed to meet the needs of persons with a disability. Our study relies on administrative data from HUD and the U.S. Census Bureau to address this research gap. We find that many persons with a disability are served by HUD-sponsored programs that are not designated for persons with a disability, even when disability accommodations have been requested, and a similarly large share of persons with a disability live in potentially eligible low-income households that do not receive HUD assistance.     

Fiscal Austerity and Rental Housing Policy in the United States and United Kingdom, 2010–2016

After the 2008 global financial crisis, both the United States and the United Kingdom introduced austerity policies targeted at particular elements of their national budgets. The purpose of this article is to compare the nature of this retrenchment; the similarities and differences in how it was implemented; and its initial impacts on one of the expenditure areas particularly affected: affordable rental housing programs and housing support for low-income households. Using a wide range of data sources, we find evidence of political and fiscal policy analogies in the timing and forms of the initial policy choices and how these were modified in the face of economic and political pressures. There are considerable similarities both in the instruments used to reduce housing expenditures and in the early impacts on support mechanisms and recipients. However, we find different histories and trajectories of support between the two countries that suggest that the longer term differences in outcomes may be more important.