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In wireless sensor networks with mobile sinks, it is a challenge to design reasonable data dissemination protocols to realize reliable, real-time and efficient data transmission from multiple sources to multiple sinks. Recently, many protocols such as TTDD, GHT and LBDD are proposed to solve this problem. However, most of them depend on the whole network topology information to optimize the data dissemination...
Data gathering is one of the most important operations in wireless sensor networks. Since the nodes operate on limited power, it is a critical task to design an energy-efficient data gathering algorithm. In this paper, we propose an energy-efficient data gathering algorithm (EDGA) in which the network is grouped into clusters (each with a clusterhead) and the nodes form chains in each cluster. Firstly,...
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...
This paper provides a polynomial time heuristic for the real-time communication scheduling problem in multi-hop wireless sensor networks.Wireless networks add a new dimension to the real-time communication problem because of interference: a transmission cannot be scheduled on a radio link if another transmission is scheduled on any interfering link. The problem being NP-hard in nature, we propose...
Delay-Tolerant/Disruption-Tolerant Networks (DTNs) have been proposed to cope with the challenges of communication in some extreme or special environments. Due to the uncertainty of node mobility, application traffic demand and other factors, it is difficult to provide performance guarantee for a DTN where all nodes may move arbitrarily. With controlled mobility, message ferries can be utilized to...
An optimization model is set up for the area covering and routing problem of Wireless Sensor Network(WSN). Two quasi-physical and quasi-sociological methods are designed for the problem, They are quasi-gravitation model and quasi-coulomb force model. Based on the Area Covering, Round Routing Method is proposed, which transfers into TSP problem. Restriction of window ant colony algorithm carry out...
The problem of estimating node positions in sensor networks and multi agent formations has been extensively studied in the last decade for the purpose of enabling self-configurable and autonomous systems. A typical scenario involves the nodes to estimate their locations using relative measurements from neighbors. When full relative positions (coordinates or, equivalently, range and angle) between...
Lifetimes of battery-powered monitoring and surveillance systems are limited by the given battery capacity. This could lead either to a complete loss, or to a significant loss of quality in the recorded image, of events. In this paper, we propose a energy-aware video codec-based system design which exploits event characteristics to minimize the energy consumption through energy-aware architecture...
In this paper, a new mechanism for the optimal energy consumption in WSNs is presented on the basis of the ant colony algorithm(ACA). The proposed mechanism can realise a best allocation of the energy for each single node in a given network. Simulation results show that, comparing with the directed diffusion routing method, the new routing mechanism can reduce the main nodes' energy consumption and...
Localization is a fundamental problem in wireless sensor networks. Current localization algorithms mainly focus on checking the localizability of a network and/or how to localize as many nodes as possible given a static set of anchor nodes and distance measurements. In this paper, we study a new optimization problem, minimum cost localization problem, which aims to localize all sensors in a network...
Security is a significant factor in many sensor network systems, such as peer-to-peer networks. Most distributed systems are known to be particularly vulnerable to Sybil attacks. In a Sybil attack, a malicious node fakes multiple identities and pretends to be multiple, distinct nodes in the system. Then an edge may exit between a Sybil node and an honest node if a malicious node successfully fools...
We investigated an optimization condition for a maximum power transmission between coils wirelessly. Due to the resonant coupling nature of the system, for the highest power transmission, there is an optimum distance between the power (receiving) coil and sending (load) coil for a fixed distance between the sending coil and receiving coil. This effect cannot be explained by a conventional magnetic...
We analyze several new problems that arise from the use of rotating directional sensors. The coverage region of a rotating directional sensor is restricted to a certain direction, and its orientation varies at constant speed. For already placed rotating directional sensors, we consider three problems for which the goal is to minimize the dark time (i.e. uncovered time) of all point in the area. We...
Wireless Sensor Networks (WSNs) have inspired tremendous research interest in since the mid-1990s. Advancement in wireless communication and miniature electromechanical systems (MEMSs) have enabled the development of low-cost, low power, multi-functional, tiny sensor nodes that can sense the environment, perform data processing, and communicate with each other untethered over short distances. Most...
The following topics are dealt with: optimization; data mining; bioinformatics; information security; software engineering; soft computing; distributed computing; parallel computing; web semantics; machine learning; computer architecture; real time system; uncertainty management; ad hoc networks and wireless sensor network.
We consider a wireless sensor network deployed to observe a physical phenomenon. The sensors amplify and forward their observations to a remote fusion center via single hop. The objective is to maximize the operational lifetime of the network such that the estimate of the underlying source at FC satisfies a certain fidelity criterion given by the maximum tolerable estimation distortion. Each sensor...
In some environment, randomly deployed sensor nodes could not satisfy the requirements of wireless sensor network. Therefore, it is necessary to use mobile sensor nodes in some special conditions. And after moving nodes are deployed randomly, they could be relocated according to the real-time situation of network coverage degree. This paper proposes a hexagonal grid-based sensor deployment algorithm,...
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...
The detector is mainly composed of CC430F5137, Lithium battery, Voltage monitor chip, temperature sensor, CO sensor and smoke detector, etc,. The detector is improved via the design optimization of hardware and software, which greatly reduces power consumption. Contemporarily, the detector uses BP algorithm program for judging whether there is a fire in the detect area. BP algorithm program is embedded...
Wireless sensor networks is consist of a group of tiny power-constrained devices with functions of sensing, computing and communication. Because of the limited energy and computational resources available to sensor nodes, the number of nodes placement to cover the whole area completely is often important than other things. Coverage effciency depends on the number of active nodes, the more active nodes...
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