This paper proposes a method to deal with holes healing problems in wireless hybrid sensor networks. With recent advances in mobile platforms, hybrid sensor networks including static and mobile sensors are becoming very popular technology. In this paper, we investigate the coverage hole healing efficiency and propose a method to improve the efficiency. Specifically, mobile sensors can dynamical...

This paper shows how a distributed algorithm, derived and justified through computational geometry, can detect and recover holes in the coverage provided by wireless sensor networks. Computational geometry is used to define conditions for the existence of holes in sensor coverage and based on these conditions, it is used to generate new distributed algorithms to detect and recover coverage hole...

The proper deployment of sensors is very important for the successful completion of the sensing tasks due to the inevitable relation with the physical world. This paper presents a novel method for the redeployment of mobile nodes in a hybrid sensor network consisting of a collection of both static nodes and mobile nodes. In such a sensor network, the locomotion ability of mobile nodes helps the...

[email protected] [email protected] Abstract— Wireless sensor networks are formed by small sensor nodes communicating over wireless links without using a fixed network infrastructure. Each of the sensor nodes is capable of sensing, processing, and transmitting environmental information. Since the sensor nodes are equipped with battery having limited energy, energy efficient information...

Connected coverage, which reflects how well a target field is monitored under the base station, is the most important performance metric used to measure the quality of surveillance that wireless sensor networks (WSNs) can provide. To facilitate the measurement of this metric, we propose two novel algorithms for individual sensor nodes to identify whether they are on the coverage boundary, i.e.,...

Scheduling the sensors active and sleep period is significantly important for achieving energy efficiency in resource constrained Wireless Sensor Networks (WSNs). Most existing node scheduling schemes consider only the energy efficiency of sensor nodes and cannot be used for mobility-centric applications since they are designed for static network topology. Though a few node scheduling schemes a...

Randomly scattered sensors may cause sensing holes and redundant sensors. In carrier-based sensor relocation, mobile robots (with limited capacity to carry sensors) pick up additional or redundant sensors and relocate them at sensing holes. In the only known localized algorithm, robots randomly traverse field and act based on identified pair of spare sensor and coverage hole. We propose a Marke...

Underwater wireless sensor networks (UWSNs) facilitate a wide range of aquatic applications in various domains. However, the harsh underwater environment poses challenges like low bandwidth, long propagation delay, high bit error rate, high deployment cost, irregular topological structure, etc. Node mobility and the uneven distribution of sensor nodes create void holes in UWSNs. Void hole creat...

Research examines how journalists cover and frame the issue of climate change in mainly nationally circulated newspapers. This study compares contrasts framing between two newspapers, New York Times Washington Post, three intermountain west, mountain town, community Jackson Hole News & Guide Hole, WY, Summit Daily County, CO, Park Record City, UT. research national versus coverage, coverage...