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A Wireless Sensor Network (WSN) is typically depicted as a distributed resource constrained platform for supporting novel pervasive applications. A possible approach is to develop applications over WSNs by resorting to mobile agent frameworks that are aimed to minimize resource costs and memory allocation. In this context, network topology is a major issue to be considered for resource optimization:...
We describe a method for accurately estimating the topology of sensor networks from time-series data collected from infrared proximity sensors. Our method is a hybrid combining two different methodologies: ant colony optimization (ACO), which is an evolutionary computation algorithm; and an adjacency score, which is a novel statistical measure based on heuristic knowledge. We show that, using actual...
A wireless sensor network is comprised of a large number of battery-limited sensor nodes. In a predefined period, sensor nodes get data and transmit data to BS by a fixed construction. In this paper, we introduce a scheme for selecting the construction to prolong the lifetime of wireless sensor network based on energy balance. Further, an optimal math model is proposed for calculating the energy cost...
We present the derivation of a novel metric for the performance prediction of Wireless Sensor Networks (WSNs). In particular, the metric can be applied in, for example, monitoring and surveillance applications where WSNs are used. Those networks execute protocols or techniques that are often sensitive to spatial correlation. The proposed metric is based on the correlation in the sensed phenomenon...
In this paper, wireless sensor network (WSN) topology optimization for dependability is considered, where two metrics “reliability” and “integrity” for WSN are defined. First, static topology optimization problem for reliability, integrity and joint optimization of them are investigated and some trade-off relationships are clarified. Then, dynamic topology optimization problem is proposed, where some...
Saving energy in Wireless Sensor Networks is essential to extend the lifetime of in-field deployments. Previous research has shown that communication is generally the most energy consuming task and needs to be reduced in order to build resource-efficient long-term applications. The communication demand for retrieving query results from deep within the sensor network is typically high. As a result,...
In this paper, a study of the behavior of wireless mesh networks is proposed, by considering energy consumption and reliability of the network. The real consumption with different network topologies and different data profiles will be analized. The objective of this work is to establish the framework to carry out energy optimizations in order to reduce the energy consumption without losing the reliability...
Wireless sensor networks (WSNs) often operate in severe surroundings and may suffer simultaneous failure of multiple nodes which gets the network partitioned into distinct segments. Restoring connectivity among these segments is crucial in order to prevent the negative effects on the application. This paper investigates effective approaches for recovering from the failure for scenarios where the distance...
In this paper, we will address a WSN deployment problem. The main objectives are i) reduce the cost of deployment, ii) ensure the requested event detection probabilities, iii) guarantee the network connectivity, and iv) maximize the lifetime of the network. We will formalize the problem as multi-objective combinatorial optimization problem. To resolve the problem, we will propose a new deployment...
Topology change is the main factor which is affecting the network life time of Wireless Sensor Network applications. In normal WSNs with stationary nodes, the topology change is often caused by node failure which is due to energy depletion. However, in the mobile Wireless Senor Network, the main reason of the topology change is caused by the node movement. Sensor nodes in the network may move in any...
In the research on mobile sensor networks, the proper deployment of sensor nodes directly affects the working effect of a mobile sensor network. For the sensor networks constructed by random distribution, better sensor coverage can be achieved by topology adjustment utilizing the mobility of the sensor nodes. Aiming at the optimization of node distribution in mobile sensor networks, a multi-object...
We study the minimum range assignment problem that consists in finding the range assignment that minimizes energy consumption in the network. We exhibit one bad behavior of classical graph reduction-based approaches: they only consider the sum of edges' weight as an optimization criterion. We then design a new graph reduction algorithm (the minimum power tree protocol) and its associated topology...
We present the estimation and evaluation of deployment models for sensor networks that exploit different amounts of a-priori information. Topologies generated from the models exhibit minimum energy consumption at maximum sensing coverage. The applied energy model makes use of measurements obtained from real experiments. We consider general sets of interesting points in the phenomena since those exhibit...
Bandwidth resource allocation and scheduling has posed a challenging problem in wireless sensor networks. This paper provides a survey on the current state-of-the-art researches in this important area. Bandwidth reservation is considered in terms of time slot allocation in a pure TDMA or TDMA/CSMA based networks. We first overview different approaches for time slot allocation in a star network topology,...
Finding an optimal key assignment (subject to given constraints) for a key predistribution scheme in wireless sensor networks is a difficult task. Hence, most of the practical schemes are based on probabilistic key assignment, which leads to sub-optimal schemes requiring key storage linear in the total number of nodes. A graph theoretic framework is introduced to study the fundamental tradeoffs between...
Wireless sensor networks (WSNs) is the next generation of sensor network and the research of network topology optimization has the important meaning for present and future. By making full use of the information about the node position and energy, the WSNs topology algorithm based on immune principle is proposed in this paper, and the simulation results show that this algorithm improves the performance...
Topology control is an effective method to improve energy-efficiency and increase the capacity in Wireless Sensor Networks (WSNs). To fully characterize WSNs with lossy links, we propose a novel probabilistic network model. Under this model, we meter the network quality using network reachability defined as the minimal of the upper limit of the end-to-end delivery ratio between any pair of nodes in...
Routing algorithm is a key component of wireless sensor networks. The researchers applied a lot of routing algorithm to satisfy the needs of various wireless sensor networks. In this paper we analyzed the topologies of multi-sink node wireless sensor networks and achieved a multi-direction routing algorithm based on meet ant colony optimization for multi-sink node wireless sensor networks. The simulation...
In order to improve communication reliability of power line carrier sensor network, a network topology dynamic discovery algorithm based on improved ant colony algorithm is proposed. The network topology discovery issue is changed into the minimum spanning tree of map by optimization strategy which based on antspsila election roads. Moreover, the idea of depth-first search is combined with to ensure...
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