A network approach, which simplifies geographic settings as a form of nodes and links, emphasizes the connectivity and relationships of spatial features. Topological networks of spatial features are used to explore geographical connectivity and structures. The PageRank algorithm, a network metric, is often used to help identify important locations where people or automobiles concentrate in the ...

Based on the following papers: 1. Review: The application of molecular genetic approaches to the study of human evolution. 2. Recovering the geographic origin of early modern humans by realistic and spatially explicit simulations. 3. Support from the relationship of genetic and geographic distance in human populations for a serial founder effect originating in Africa. 1. Introduction This lectu...

Seasonal germination timing strongly influences lifetime fitness and can affect the ability of plant populations to colonize and persist in new environments. To quantify the influence of seasonal environmental factors on germination and to test whether pleiotropy or close linkage are significant constraints on the evolution of germination in different seasonal conditions, we dispersed novel rec...

Pollution of inhabited geographic landscapes is often a public health concern. Ascertaining the degree and scope of such pollution is a difficult task and frequently involves analysis of soil samples. This article describes ways to statistically analyze the geographic distribution of soil samples to better understand polluted landscapes, in part to determine whether more samples are needed; spe...

We analyze how buyers use electronic channels to shift their purchases across geographic locations and the corresponding implications for geographic price variance and levels. Using data from the wholesale used vehicle market from 2003 to 2008, we find that buyers are more sensitive to price and less sensitive to distance when purchasing via an electronic channel than via the physical channel. ...

In data-centric sensor networks, where data processing and transfer are oblivious to node IDs, conventional node-based security models are not suitable. We introduce the novel concept of secure locations to address non-cooperative and malicious behavior in location-aware sensor networks. Our architecture also introduces a scalable trust-based routing protocol (TRANS) to track, update and route ...

This paper reports on research into interactive, dynamic statistical graphics (DSG) applied to spatial data maintained within a geographic information system (GIS). We developed a bidirectional link between ArcView 2.1TM, a GIS, and XGobi, a DSG program. Multivariate data, collected at geographic locations, is passed from ArcView to XGobi and can be dynamically analyzed. The relation between th...

OBJECTIVE To detect temporal case clustering in patients with pityriasis rosea in different geographic locations. DESIGN Regression analysis of dates on which 1379 patients were diagnosed as having pityriasis rosea in 3 different geographic locations. The control data consisted of dates of diagnosis of patients with psoriasis in the same settings. SETTING Dermatology clinics in Kuwait, Minn...

Toponym disambiguation or location names resolution is a critical task in unstructured text, articles or documents. Our research explores how to link ambiguous locations mentioned in documents, news and articles with latitude/longitude coordinates. We designed an evaluation system for toponym disambiguation based on annotated GEOCLEF data. We implemented a node-based approach taking population ...

Platform boundary resources play an increasingly transformative role in the global digital ecosystem. In this study, we focus on one type of platform boundary resource, namely application programming interfaces (APIs). Guided by two competing assumptions—1) that geographic boundaries are blurred and potentially less important in a digitally connected world, and 2) that geographic proximity matt...