Evaluating the geographic concentration of industries using distance-based methods

We propose new methods for evaluating the spatial distributionof firms. To assess whether firms are concentrated or dispersed,economists have tradi-tionally used indices that analyse theheterogeneity of a spatial structure at a single geographiclevel. We introduce distance-based methods, Besag's L function(derived from Ripley's K function) and Diggle and Chetwynd'sD function to describe simultaneously spatial distribution atdifferent geographical scales. Our empirical applications considerthe distribution of French manufacturing firms in the Parisarea and in France generally. For some geographic levels, resultsshow significant concentration or dispersion of firms accordingto their sector of activity.     

The Saxons within Carolingian Christendom: post-conquest identity in the translationes of Vitus,Pusinna and Liborius

The Franks incorporated Saxony into the Carolingian empire through a long, brutal struggle coupled with forced conversion. When Saxons themselves began to write a few decades afterwards, they had to make sense of this history and of their role and identity in their contemporary Carolingian world. In contrast to the portrayal of Saxons in writers such as Einhard and Rudolf, three ninth-century Saxon accounts of relic translations — those of Vitus, Pusinna and Liborius — reinterpreted history to claim a place for the Saxons as a distinct group equal to the Franks within the populus Christianus under the Carolingian monarchs. As a key part of their literary strategies, these authors attempted to salvage from the story of their defeat and forced Christianisation an account of God's sovereignty, native agency and virtue (especially fidelity) as a foundational element of Saxon identity. These texts prefigure the debates about post-conquest Saxon identity which would underlay the later and better-known Ottonian triumphal self-conceptions. Moreover, the concerns of these authors led them to remarkable hagiographical innovations in grappling with paganism, conversion, miracles, social class and faith.     

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.     

Ulsterisation and the Troubles thriller: Eoin McNamee's Resurrection Man

Although the progression of peace is, in all likelihood, finally imperilling the ascendancy of the thriller as the literary venue for representing social and political life in contemporary Northern Ireland, the genre continues to provide important access points for understanding the Troubles. Eoin McNamee's grim and harrowing Resurrection Man, for example, may be the only contemporary Northern Irish novel to represent the British government's mid-1970s internal security strategy known as ‘Ulsterisation’. By suggesting the various ways in which violence and subterfuge were nourished by government interests and supported by covert operatives, McNamee's novel subtly depicts a London intent on managing the conflict while insulating it from British politics and international criticism. Even as it does so, though, Resurrection Man ultimately struggles to avoid the thriller's more regressive tropes and generic conventions.     

LOCAL INPUT AND PRODUCTIVITY GROWTH IN U.S. MANUFACTURING: 1972–2002*

ABSTRACT This research analyzes manufacturing growth and decline across metropolitan and nonmetropolitan regions during the 1972–2002 period. We decompose real value added growth across local labor market areas in the lower 48 U.S. states into contributions from labor, capital, and total factor productivity. We then estimate a model describing the long‐run growth of labor, capital, and productivity and find that increased productivity increases the growth of labor and capital, as well as a positive correlation between labor and capital stock growth. We also find evidence that human capital investment and agglomeration economies encourage productivity growth, while unionization discourages it.