The purpose of this study is to examine the relationship between dollar store expansion and food access. We begin by documenting growth stores over time comparing areas with without poor Using a time-varying measure accessibility, we identify persistent access challenges, where supermarket large grocery have been absent for entire period (2000–2017), track into these areas. use combination geoc...

Prices affect food purchase decisions, particularly in lower-income communities, where access to a range of food retailers (including supermarkets) is limited. The aim of this study was to examine differences in staple food pricing between small urban food stores and the closest supermarkets, as well as whether pricing differentials varied based on proximity between small stores and larger reta...

Consider the single server queue with an infinite buffer and a FIFO discipline, either of type M/M/1 or Geom/Geom/1. Denote by A the arrival process and by s the services. Assume the stability condition to be satisfied. Denote by D the departure process in equilibrium and by r the time spent by the customers at the very back of the queue. We prove that (D, r) has the same law as (A, s) which is...

Increasingly, manufacturers sell their products in their own retail stores, and many of these stores appear to be in direct competition with independent retailers; i.e., both types of retail stores are physically co-located. We analyze one way this practice affects the retail market. We find that, when independent retailers compete against company stores (instead of just against other independe...

Adaptive data is characterised by its ability to react to changes in the environment. Such data frequently occurs in Artificial Intelligence applications where the knowledge base may alter dynamically to adapt to new stimuli. Such systems are usually written in typeless, dynamically bound languages. Here we describe the concept of persistence and show how it may also be used in conjunction with...

This paper tells the story of Vectorwise, a high-performance analytical database system, from multiple perspectives: its history from academic project to commercial product, the evolution of its technical architecture, customer reactions to the product and its future research and development roadmap. One take-away from this story is that the novelty in Vectorwise is much more than just column-s...

Serum ferritin concentration has been measured during the course of pregnancy in 154 women. There was a rapid decrease in iron stores during early pregnancy irrespective of any iron therapy. Oral iron did, however, prevent the stores reaching iron deficient levels during the second half of pregnancy. The results suggest that maternal erythroid activity starts early in pregnancy and may exhaust ...