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A series of experiments examined the characteristics of train-duration response functions and two statistics derived from these functions: train-duration thresholds and maximum rates. Train-duration response functions exhibited a steplike appearance. The slope of the train-duration curves was not influenced by either reward or performance manipulations,… (More)
Choices about transportation alternatives permeate our daily lives. We are accustomed to making quite sophisticated decisions about the times we travel, the transportation mode we choose, the routes we select, and the multipurpose trips that we link together as we plan our day. Because the impact of traffic congestion (as well as events such as automobile… (More)
Previous studies have indicated that tobacco outlets seem to be clustered in low-income minority neighborhoods. This study utilized a cross-sectional design to examine the relationships among minority status, median household income, population density, commercial land use, and location of tobacco outlets at the census tract level in Polk County, Iowa.… (More)
Towards interoperable geo-information standards: A comparison of reference models for geo-spatial information.