Given a set P of points in the plane, and a set D of unit disks of fixed location, the discrete unit disk cover problem is to find a minimum-cardinality subset D′ ⊆ D that covers all points of P . This problem is a geometric version of the general set cover problem, where the sets are defined by a collection of unit disks. It is still NP-hard, but while the general set cover problem is not appr...

Location-based services, navigation applications, emergency services, management of equipment in the field, and other location-dependent services need geographic location information about a target (user, resource or other entity). There is a need to securely gather and transfer location information for location services, protecting the privacy of the individuals involved. This document describ...

Location-based services, navigation applications, emergency services, management of equipment in the field, and other locationdependent services need geographic location information about a Target (such as a user, resource or other entity). There is a need to securely gather and transfer location information for location services, while at the same time protecting the privacy of the individuals...

This paper investigates the dynamic behavior of Gas Metal Arc Welding (GMAW) process for two types of power supplies –inverter and rectifier- for short circuit transfer mode. The large ripples on the rectifier power source are able to perturb the metal transfer mode. In this experimental work some operating points in the short circuit mode have been selected using an automatic pipeline welding ...

Where to put the monitoring points in a system is a very common problem (environment, industry , health, and so on). We show that Archimedes maps, that is, measure preserving transformations , provide the right tool for this problem. Conversely, we insist that random exploration , often preferred because of simplicity and low cost, should definitely be avoided. Many of our contracts, both in in...

Eigen-points estimates the image-plane locations of fiduciary points on an objects. By estimating multiple locations simultaneously, eigen-points exploits the interdependence between these locations. This is done by associating neighboring, inter-dependent control-points with a model of the local appearance. The model of local appearance is used to find the feature in new unlabeled images. Cont...