Although wildlife biologists need reliable estimates of white-tailed deer (Odocoileus virginianus) density to facilitate management, few studies have examined distance sampling as a density estimation technique for this species. We compared direct (i.e., spotlighting from road transects) and indirect (i.e., counting pellets on randomly placed transects) distance-sampling techniques for estimati...

With the advent of ubiquitous computing, we can easily acquire the locations of moving objects. This paper studies the clustering problem for trajectory data which are constrained by the road network. While many trajectory clustering algorithms have been proposed, they do not consider the spatial proximity over the road network. For such trajectory data, we propose a new distance measure that r...

In this report, we study information propagation via inter-vehicle communication along two parallel roads. By identifying an inherent Bernoulli process, we are able to derive the mean and variance of propagation distance. A road separation distance of times the transmission range distinguishes two cases for approximating the success probability in the Bernoulli process. In addition, our results...

BACKGROUND India is motorising rapidly. With increasing motorisation, road traffic injuries are predicted to increase. A third of a billion children travel to school every day in India, but little is known about children's safety during the school commute. We investigated road traffic injury to children during school journeys. METHODS We conducted a cross-sectional survey in Hyderabad using a...