In Wireless Sensor Networks, sensors are used for tracking objects, monitoring health and observing a region/territory for different environmental parameters. Coverage problem in sensor network ensures quality of monitoring a given region. Depending on applications different measures of coverage are there. Barrier coverage is a type of coverage, which ensures all paths that cross the boundary o...

We analyze a gathering process for a group of mobile robotic agents, identical and indistinguishable, with no memory (oblivious) and no common frame of reference (neither absolute location nor a common orientation). The agents are assumed to have bearing only sensing within a limited visibility range. We prove that such robots can gather to a small disk in the R-plane within a finite expected n...

Nowadays sensors and especially biosensors play an important role in medical diagnosis and detection of food and environment contaminations. Biosensors’ facilities have been improved significantly by using technologies such as surface plasmon resonance, microfluidics, laser, and electrochemistry. These technologies are now available on chips in micro- and nano-scale and are capable of mea...

This paper proposes a nondestructive testing technique based on modal analysis in order to develop a new, efficient and simple damage detection method for civil structures. Structural identification for health monitoring involves comparison of changes in structural properties or response, and it can be viewed as pattern classification problems. However, a very large database is required to stor...

We present methods for patrolling and surveillance in an environment with a distributed swarm of robots with limited capabilities. We make use of a distributed triangulation of the work space, in which a set of n stationary sensors provides coverage control; in addition, there are k mobile robots that can move between the sensors. Building on our prior work on structured exploration of unknown ...

BACKGROUND: During conditions of poor perfusion, the accuracy of conventional extremitybased pulse oximeters may be limited. Limited evidence suggests that forehead perfusion may be better preserved during such periods, but pediatric experience with newer forehead reflectance sensors is limited. We prospectively compared the accuracy of a forehead reflectance sensor, the Max-Fast, with a new-ge...

A wireless sensor network can be seen as a large number (hundreds of thousand) of small (a few cubic millimetres) devices, battery powered, with very limited hardware resources. Such a network has been studied specifically in the ad hoc model, where the sensors autonomously set up a network infrastructure. We propose here an extension to the current wireless ad hoc sensor network (WSN) model (i...

A limited number of Anisotropic Magnetoresistive (AMR) commercial-off-the-shelf (COTS) magnetic sensors of the HMC series by Honeywell, with and without integrated front-end electronics, were irradiated with gamma rays up to a total irradiation dose of 200 krad (Si), following the ESCC Basic Specification No. 22900. Due to the magnetic cleanliness required for these tests a special set-up was d...