Mobile sensor nodes (MSNs) are equipped with locomotive can move around after having been deployed. They are equipped with limited energy. A large portion of energy is drained during the traversal. In order to extend the life time of a MSN, the traveling distance must be minimized. Region of interest (ROI) is covered with multiple MSNs using coverage based pattern movement. When a group of MSNs...

Due to random deployment of static sensor nodes and environmental factors existence of holes in wireless sensor networks is inevitable. This holes results in reducing the data transmission performance and in additional energy consumption. Consequently, the hole problem is an important factor for prolonging the network lifetime. The network lifetime can be improved by deploying additional mobile...

Node deployment plays an important role in the design of wireless sensor networks (WSNs). Many important properties such as coverage, connectivity, data fidelity and lifetime are directed influenced by the way nodes are placed in the sensor field. In this work we show that the use of a stochastic point process, namely the C model, is able to increase the network lifetime by addressing the “ener...

We consider the focused coverage self-deployment problem in mobile sensor networks, where an area with maximum radius around a Point of Interest (POI) must be covered without sensing holes. Li et al. [9][10] described several algorithms solving this problem. They showed that their algorithms terminate in finite time. We present a modified version of the Greedy-Rotation-Greedy (GRG) algorithm by...

BACKGROUND Effective January 1, 2006 Medicare Part D became a new source of prescription drug coverage for people with HIV/AIDS in the United States. The implementation of Part D has affected access to antiretrovirals for people with HIV/AIDS. In North Carolina, access can be difficult because of the state's struggling safety net programs and the growing HIV-infected populations among Blacks an...

We have recently begun a program of high resolution infrared imaging at Palomar Observatory. As a part of this effort, we have investigated the use of nonredundant masks both as an imaging technique and as a method of analyzing various aspects of our imaging system. In particular, we have applied the technique to a bright star and binary system using a three-hole mask. We find the method is use...