We study the connectivity in vehicular ad-hoc networks in a downtown scenario, where the mobility of vehicles is constrained on a lattice-shaped road network. We theoretically investigate the connectivity under the Poissonpositioning assumption, where vehicles are positioned according to a Poisson process on each road at any arbitrary instants. We find that the Poisson-positioning assumption al...

Clustering is an important part of data mining techniques, and VDBSCAN is a well-known density-based one. VDBSCAN is robust against noise and can recognize arbitrary shapes of clusters. Besides, it works effectively when dealing with datasets with varying densities. A main drawback of VDBSCAN is that it still requires a user-specified parameter K. An inappropriate choice of K can seriously degr...

Urban street networks in the United States have been primarily designed for automobile traffic with negligible considerations to non-motorized transportation users. Due environmental issues and quality of life concerns, communities are reclaiming spaces active modes slowing speeds their downtown. Moreover, tactical urbanism, i.e., use space innovative purposes other than moving traffic, is beco...

Data gathered relating to the Lyon’s shared bicycling system, Vélo’v, is used to analyze 11.6 millions bicycle trips in the city. The data show that bicycles now compete with the car in terms of speed in downtown Lyon. It also provides information on cycle flows that can be of use in the planning of dedicated bicycle lanes and other facilities. 2010 Elsevier Ltd. All rights reserved.

We first motivate why dedicated pervasive computing infrastructure is needed for promoting long-term large-scale pervasive computing research in real-world setting. Then we briefly describe the UBI-hotspot infrastructure we have deployed at downtown Oulu, Finland, for this purpose. We conclude with a discussion on the challenges this kind of infrastructure deployment faces and our efforts of ma...

Of 200 individual Xenopsylla cheopis fleas removed from Rattus norvegicus rats trapped in downtown Los Angeles, CA, 190 (95%) were positive for the presence of Bartonella DNA. Ninety-one amplicons were sequenced: Bartonella rochalimae-like DNA was detected in 66 examined fleas, and Bartonella tribocorum-like DNA was identified in 25 fleas. The data obtained from this study demonstrate an extrem...