This paper describes the use of formally specified RBAC policies for protecting federated relational database systems that are accessed over a wide area network. The method that is described combines a formally specified RBAC policy with both temporal and locational constraints. It does not depend on any security mechanism supported by a specific DBMS and is thus portable across platforms.

This paper employs Roback’s locational-equilibrium model of public-goods pricing, crosssectional data from the Census of Population and Housing, and SMSA-level estimates of public capital stocks in order to examine the productive contribution of public capital. I find that public capital has a small positive impact on private output. JEL classification codes: E62, R53

Global Positioning Systems are becoming increasingly pervasive. The forensic acquisition and analysis of these units is of great interest as it has the potential to yield historic locational data for these units. Analysis of the TomTom one satellite navigation unit has resulted in a method to reliably extract historic data from these devices in a forensically sound manner.

OST scholars in geography and related social sciences have recognized that the locational structure of man’s economic, political and cultural activities is not in a static state. Yet very little attempt has been made to conceptualize the manner by which the spatial arrangement of man’s establishments change over time. This study seeks to provide at least a partial solution for meeting this need...

This is the first of two papers in which multiple criteria location problems (MCLPs) are discussed. In this paper the main aim is to formalize a discrete MCLP and to develop a generalized network model. A critical overview of various techniques for generating efficient solutions to multiple criteria decision problems is offered. The three most commonly used methods for tackling MCLPs, namely th...

BACKGROUND Previous studies have provided mixed evidence with regards to associations between food store access and dietary outcomes. This study examines the most commonly applied measures of locational access to assess whether associations between supermarket access and fruit and vegetable consumption are affected by the choice of access measure and scale. METHOD Supermarket location data fr...