Optimal Sampling Design for Variables with Varying Spatial Importance

It is often desirable to sample in those locations where uncertainty associated with a variable is highest. However, the importance of knowing the variable's value may vary across space. We are interested in the spatial distribution of Received Signal Strength Indicator (RSSI), a measure of the signal strength from a cell tower received at a particular location. It is crucial to estimate RSSI values accurately in order to evaluate the effectiveness of mayday systems designed for rapid emergency notification following vehicle crashes. RSSI estimation is less important for locations where the probability of a crash is low and where the likelihood of call completion is either close to zero or one. We develop a method for augmenting an initial spatial sample of RSSI values to achieve a high‐precision estimate of the probability of call completion following a crash. We illustrate the approach using data on RSSI and vehicle crashes in Erie County, NY.     

Voluntarism, municipalism and welfare: the geography of hospital utilization in England in 1938

This paper provides a comprehensive analysis of the pattern of hospital utilization (rather than provision) in England prior to the establishment of the NHS, showing the extent to which the probability of obtaining hospital treatment was a function of residence. Access to hospital care depended on the vigour of voluntarism and the political priorities of local governments. The pattern of voluntary hospital utilization is shown to have been markedly unequal, but the effect of municipal provision was to reduce disparities in access to services. The paper demonstrates variations in hospital utilization and discusses contemporary assessments of the situation. This work contributes to debates about the efficacy of non-profit forms of welfare delivery; it provides a novel British study to complement American work in this field. It also raises questions about the contemporary vogue for partnerships in health care delivery between the public and private sectors, arguing that such proposals rest on an optimistic view of history.     

Adaptive Cell Tower Location Using Geostatistics. 基于地统计学的适应性基站发射塔选址研究

In this article, we address the problem of allocating an additional cell tower (or a set of towers) to an existing cellular network, maximizing the call completion probability. Our approach is derived from the adaptive spatial sampling problem using kriging, capitalizing on spatial correlation between cell phone signal strength data points and accounting for terrain morphology. Cell phone demand is reflected by population counts in the form of weights. The objective function, which is the weighted call completion probability, is highly nonlinear and complex (nondifferentiable and discontinuous). Sequential and simultaneous discrete optimization techniques are presented, and heuristics such as simulated annealing and Nelder–Mead are suggested to solve our problem. The adaptive spatial sampling problem is defined and related to the additional facility location problem. The approach is illustrated using data on cell phone call completion probability in a rural region of Erie County in western New York, and accounts for terrain variation using a line‐of‐sight approach. Finally, the computational results of sequential and simultaneous approaches are compared. Our model is also applicable to other facility location problems that aim to minimize the uncertainty associated with a customer visiting a new facility that has been added to an existing set of facilities.     

Redefining ‘Aid’ in the China–Africa Context

Discussions on the politics of Chinese engagement with African development have been marked by increasing concern over Chinese use of aid in exchange for preferential energy deals. Normative liberal discourse criticizes the Chinese for disbursing ‘rogue aid’ and undermining good governance in the African continent. These criticisms not only ignore the longer‐term motivations and modalities of Chinese aid and the historical diversity of Chinese relations with Africa, but also uncritically assume ‘Western’ aid to be morally ‘superior’ and ‘more effective’ in terms of development outcomes. This paper consists of three parts. First, it will discuss the debates surrounding Chinese engagement in Africa, especially around aid and development issues. Second, the paper maps the historical development of China–Africa engagement and investigates the impacts of the changing modalities of Chinese aid with reference to case studies of two countries: Angola and Ghana. It then offers a comparative analysis of the similarities and differences between these two cases. The principal argument is that Chinese and Western donors employ different ideologies and practices of governance to conceal their own interests and political discourses in the African continent.     

Investigating perceptions of antisocial behaviour and neighbourhood ethnic heterogeneity in the British Crime Survey

There is much concern in the UK about the effects on community cohesion of antisocial behaviour, but to date relatively little is known about the geography of such behaviour: for what sort of people, and in what sort of places, are high levels of antisocial behaviour a problem? What are the links, if any, between such behaviour and local socio-economic conditions, and how do such perceptions relate to local crime rates? Using data from the British Crime Survey and other secondary datasets, we develop and extend previous work that has investigated links between individual socio-economic characteristics, neighbourhood characteristics and individual perceptions of antisocial behaviour. A multilevel modelling approach is used to ensure that individual- and area-level effects are not conflated. Secondly we extend the substantive knowledge surrounding the relationship between neighbourhood ethnic heterogeneity and individual perceptions of antisocial behaviour. In so doing, we challenge recent contentions that heterogeneity is associated with declining social cohesion and trust. We conclude that at a small-area scale for England, the primary area-level determinants of high levels of antisocial behaviour lie in material circumstances, and that ethnic heterogeneity has no discernible effect on perceptions of antisocial behaviour.     

British voluntary hospitals, 1871-1938: the geography of provision and utilization

This article examines the distribution of beds, staff and in-patients in voluntary hospitals in England, Wales and Scotland between 1871 and 1938. The findings bear upon two theoretical debates; first, the concern of historians of social policy with the extent to which charity and mutual insurance delivered a satisfactory level of institutional care before the NHS, and second, the broader issue of whether the localism of voluntary sector provision tends to produce a geographically uneven service. We survey the chronology of voluntary hospital growth pointing to reasons for foundations. We then analyse the levels of beds, staff and in-patients per head of population in counties, county boroughs and large burghs. This evidence suggests that despite the expansion of the sector and the narrowing of differences between places, considerable variations in provision and utilization remained. We argue that these variations were likely to have had an impact on the health of individuals. We conclude by tracing the emergence in political and public discourse of the perception that geographical unevenness was a failing of the voluntary system.     

Hospital contributory schemes and the NHS debates 1937-46: the rejection of social insurance in the British welfare state?

This article considers the discussion and rejection of social insurance model of funding for the British National Health Service. Specifically it asks why the hospital contributory scheme movement had so little impact on policy debates in the 1940s. We argue that at the start of the policy-making process serious consideration was given to the incorporation of this mode of funding, not least because the contributory schemes, with some ten million members, played a major role in financing existing voluntary hospital provision. Early sections describe the growth and nature of the schemes, noting that, despite their large working-class constituency and the presence of labour movement representatives amongst their leadership, they remained peripheral to discussion of reform in the interwar period. We then trace the emergence of the proposal for an insurance-based 'hotel-charge' in civil servants' discussions about hospital funding the Beveridge Report. Officials, however, remained sceptical about the contributory schemes' capacity to deliver a comprehensive and efficient funding mechanism, given their lack of uniformity, the gaps in their coverage, and the limited progress of reciprocal arrangements between them. Finally, we note the ineffectiveness of the British Hospital Contributory Schemes Association as a player in the policy community. Its leadership had no clear strategy for influencing events and was reluctant to deploy pressure group tactics such as lobbying through the press or parliament. Crucially, the movement was divided internally between those members who supported the voluntary system and others who welcomed a publicly funded health service.     

An attempt to estimate firing temperature using OSL pre-dose sensitization of quartz

The estimation of firing temperature of ceramics using methods based on pre-dose sensitization of the 110°C TL peak of quartz have yielded incoherent results. Recently the fast component of the CW-OSL of quartz has been observed to have pre-dose characteristics similar to that of the 110°C TL peak. The motivation for this study has been to look into the feasibility of this signal, the OSL counter part of pre-dosed TL emission, for the firing temperature identification. The variation in the sensitization ratio of the TL and OSL emissions with different heating temperatures was also utilized to unveil the firing temperature mark of the specimen.