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This paper proposes a distance coefficient-based scheme to solve the problem of selecting k control centers from the sensors in a wireless sensor network as well as dividing the sensors into k groups for the minimization of the distance between each control center and its farthest sensor. The proposed scheme can avoid the drawback of applying the farthest-first or the nearest-first method in the control...
Wireless devices such as sensors have increasingly more processing, storage, and networking capabilities, making wireless sensor networks (WSNs) get lots of attentions in recent years. In addition, the cost of sensors is constantly decreasing making it possible to use large quantities of these sensors in a wide variety of important applications in environmental, military, commercial, health care,...
In this poster, we consider software-defined wireless sensor networks (SDWSNs) and present a lightweight flow management to reconfigure flow entries in flow-table when link fault occurs in the data plane of SDWSNs.
In this paper, we study the problem of data gathering in ad-hoc sensor networks using a mobile entity called mule. The mule traverses the children of failed sensors, to prevent loss of data. Our objective is to define the optimal communication tree and the mule's placement such that the mule's overall traveling distance is minimized. We explore this problem in several network topologies including:...
In this article, we consider software-defined wireless sensor networks (SDWSNs) and propose a scheme for sleep scheduling with low control overhead-based flow-entry in flow-table to overcome the limitation of control traffic in SDWSNs.
In wireless sensor networks (WSNs), energy is dissipated mainly when sensors are communicating with sinks. As a result, multiple sinks are deployed in the network in order to increase its coverage area and shorten the communication distance between these two entities. This raises the issue of how best to bind sensors to sinks without overloading any sink. In this paper, we solve the sensor-to-sink...
Recently, there has been growing interest in studies of heterogeneous random key graphs. In this paper, we consider a heterogeneous random key graph G (n, a, Kn, Pn) defined on a set Vn comprising n nodes, where a is a probability vector (a1, a2,…, am) and Kn is (K1, n, K2, n, …, Km, n). Suppose there is a pool Pn consisting of Pn distinct items. The n nodes in Vn are divided into m groups A1, A2,…,...
In this paper, we present the Context-Aware Opportunistic Resource-Based Routing Protocol (CORB) for intermittently-connected stationary wireless sensor networks. This protocol targets domains such as ambiance control in smart buildings. Unlike existing context-aware routing approaches which consider node mobility as the main source of disconnection, CORB only considers the nodes' limited resources...
In Wireless Sensor-Actor Networks (WSANs), sensors probe the surroundings and forward their data to actors. Actors collaboratively respond to achieve predefined application mission. However, since the environment where WSANs are used is usually complex and harsh, actors cannot communicate with its neighbor actors occasionally due to the failure of an actor. Although the recent work provides a connection...
Wireless Sensor Networks (WSNs) are made of a large amount of small devices that are able to sense changes in the environment, and communicate these changes throughout the network. An example of such network is a photo voltaic (PV) power plant, where there is a sensor connected to each solar panel. Because such a network covers a large area, the number of sensors can be very large. The task of each...
Load on individual cluster head node increases (decreases) if there exist less (more) than the optimum number of cluster head nodes, As we only fix the the number of cluster heads and as the nodes choose the nearest cluster head for data transmission, the number of supported nodes may vary for different cluster head nodes. This leads to uneven load distribution among nodes in a Wireless Sensor Network...
Consensus algorithms can be used to compute an average value across a multi-hop network in a distributed way. However, their convergence to the right value is not guaranteed in the presence of random packet losses that are common in real life low-power wireless networks. Corrective consensus solves this problem by using a set of auxiliary variables to compensate for the asymmetric state updates caused...
Health-care monitoring with Wireless Sensor Networks (WSN) has become a major interest during the last few years. The use of efficient communication protocols is crucial in minimizing transmission delay and energy consumption of sensor nodes. In a heterogeneous WSN context, we propose, efficient mobility aware mechanisms which may be implemented in large three-tier WSN. These mechanisms must be designed...
Security is one of the core challenges especially for ICT in disaster Recovery. Sensitive data is transmitted via insecure links. Furthermore, there may be competing interests. Thus, there is a high probability of disturbance or eavesdropping of communication. However, the hierarchical structure of networks in such scenarios can be exploited for security purposes. Based on this, we developed the Topology...
Sensors in sensor networks are operated by their embedded batteries and they can not work any more if the batteries run out. The data collected by sensors should be transferred to a sink node through the efficient routes. Many energy efficient routing algorithms were proposed. However, the previous algorithms consume more energy since they did not consider the transmission range and direction. In...
Using sensors' deployment information in key management schemes is often proposed as a means to achieve local connectivity in large sensor networks. However, some proposed schemes are difficult when there are obstacles and holes in the network topology. We proposed an Irregular-location based Key Pre-distribution (IKP) scheme to solve the problem that boundary regions which have a fewer sensors may...
Wireless sensor networks (WSN) are affected by underlying environments in which sensors are deployed randomly. Inevitably, there are many irregular holes in a WSN because of the existence of obstacles or the death of some sensors. To detect these holes is of great importance to both WSN applications and networking functionalities. Holes are described by a set of sensor nodes on their boundaries. In...
Wireless sensor networking is envisioned as an economically viable paradigm and a promising technology because of its ability to provide a variety of services, such as intrusion detection, weather monitoring, security, tactical surveillance, and disaster management. The services provided by wireless sensor networks (WSNs) are based on collaboration among small energy-constrained sensor nodes. The...
OCARI is a wireless communication technology targeting applications in harsh environments such as power plants and warships. It supports mesh topology and provides a deterministic MAC access for time-constrained communications as well as energy efficient communications for an increased network lifetime. Based on the PHY layer of IEEE 802.15.4, it supports the ZigBee APS and APL primitives and profiles,...
The underwater target localization problem is one important application for underwater acoustic sensor networks. This paper, based on "underwater acoustic transmission theory", solves the target localization problem. The proposed algorithm firstly studies the principle of underwater acoustics and applies it to set up the model of underwater signal energy transmission. According to the model,...
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