The use of exteroceptive sensing for the stabilization of a nonholonomic mobile robot to a desired pose is considered in the present paper. Visual data, obtained from a camera mounted on the robot and tracking a known target, are used in a visual servoing scheme based on time varying exponential stabilizers, where these data are introduced directly in the control loop. We study the planar case,...

It has been shown that an agent located at the junction of wired and wireless links can help streaming media systems identify where packet losses occur and therefore maintain proper endto-end congestion control. In this paper, we further expand the functionality of such agents in two ways. First, they allow streaming servers to identify the allowed transmission rate in both the wired and wirele...

The B-POS (Bluetooth Point of Sale) is the prototype of a secure, mobile macropayment system. Since heterogeneous wireless network technologies such as PANs, LANs, and WANs have wellknown security weaknesses, it is mandatory to enforce security services, such as authentication, confidentiality, integrity, and non-repudiation. This article describes a Java-based macropayment system prototype fea...

Introduction The acronym PANDAS reveals a pediatric autoimmune neuropsychiatric disorder associated with Streptococcus pyogenes infection. This disorder is defined by: (a) the presence of obsessive-compulsive disorder (OCD) or tics; (b) abrupt onset and remitting/relapsing course; (c) prepuberal onset of all symptoms; (d) temporal association with a group A b-hemolytic S. pyogenes infection; (e...

Across the surface of Mars, evidence past lacustrine and evaporitic environments has been found within basins craters, where often layered sedimentary deposits hydrated minerals are observed. However, intensity, duration, precise phases aqueous processes during their deposition remain unresolved mostly for our inability to model subsurface structures. Although several geological locations on Ea...