In covering based rough sets, the neighborhood of an element is the intersection of all the covering blocks containing the element. All the neighborhoods form a new covering called a covering of neighborhoods. In the course of studying under what condition a covering of neighborhoods is a partition, the concept of repeat degree is proposed, with the help of which the issue is addressed. This pa...

BACKGROUND Several studies have highlighted the importance of collective social factors for population health. One of the major challenges is an adequate definition of the spatial units of analysis which present properties potentially related to the target outcomes. Political and administrative divisions of urban areas are the most commonly used definition, although they suffer limitations in t...

as it is commonly understood, urban neighborhoods play a significant role in developing urbansustainability as the smallest unit of city so that the formation and promotion of neighborhood identity, and focusingon social relationships would be in harmony with urban sustainability. it is believed that a dramatic change in spatialstructure of urban neighborhood include a decline in levels of poli...

Anonymous database search protocols allow users to query a database anonymously. This can be achieved by letting the users form a peerto-peer community and post queries on behalf of each other. In this article we discuss an application of combinatorial configurations (also known as regular and uniform partial linear spaces) to a protocol for anonymous database search, as defining the key-distri...

Childhood lead poisoning in the United States remains a persistent, prevalent environmental public health problem, especially for children living in central-city neighborhoods. These neighborhoods typically are racially segregated, are in proximity to current and/or legacy lead emission sources, consist of older housing, and contain disproportionately African American or black children of low-i...