This article presents a role dynamic management algorithm for sensor devices. The network scenario considers a wireless sensor network in which each node can assume different roles. Specifically, attention is focused ...
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ISBN:
(纸本)9781424404247
This article presents a role dynamic management algorithm for sensor devices. The network scenario considers a wireless sensor network in which each node can assume different roles. Specifically, attention is focused on two different roles: the active and the passive role. When a sensor device assumes an active role it uses a greater amount of energy greater than the passive role, The scope of this work is to introduce a dynamic management strategy to better distribute the energy in the network varying dynamically roles of the nodes under different mobility conditions. This dynamic algorithm is applied to an energy-efficient protocol based on a cross-layered approach (ESR and EMAC) and which ensures a good node lifetime. Two different algorithms have been developed to ensure a dynamic management of the node roles with the ESR and EMAC approach. Both these approaches have been evaluated through a simulation tool OMNeT++ and their performance have been compared with the original ESR and EMAC.
Emerging wireless communication standards and more capable sensors and actuators have pushed further development of wireless sensor networks. Deploying a large number of sensor nodes requires a high-level framework en...
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In this paper we present a framework to provide dependability through accountability Our proposal exploits the asymmetry present in the majority of sensor data processing to cheaply validate events and processing whic...
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ISBN:
(纸本)0769525202
In this paper we present a framework to provide dependability through accountability Our proposal exploits the asymmetry present in the majority of sensor data processing to cheaply validate events and processing which occurs at various points in a distributed middleware system. We exemplify our framework with reference to two real-world distributed location middlewares. We adapt one of these to evaluate our framework and present performance results.
The proceedings contain 134 papers. The topics discussed include: OPSENET: a security-enabled routing scheme for a system of optical sensor networks;efficient integration of Web services in ambient-aware sensor networ...
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ISBN:
(纸本)1424404258
The proceedings contain 134 papers. The topics discussed include: OPSENET: a security-enabled routing scheme for a system of optical sensor networks;efficient integration of Web services in ambient-aware sensor network applications;design and dimensioning of a novel composite-star WDM network with TDM channel partitioning;snapshot: a self-calibration protocol for camera sensor networks;sensor localization and camera calibration in distributed camera sensor networks;restorability analysis of two protection cycles in random mesh networks;QoS oriented contention resolution techniques for optical burst switching networks;evaluation of network distances properties by NDS, the network distance service;SeeMote: in-situ visualization and logging device for wireless sensor networks;and graded channel reservation with path switching in ultra high capacity networks.
In wireless sensor networks, the power of energy-constrained sensor nodes is largely drained by data communication tasks. Designing efficient data communication mechanisms is therefore, a major key to maximizing the l...
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ISBN:
(纸本)9781424404247
In wireless sensor networks, the power of energy-constrained sensor nodes is largely drained by data communication tasks. Designing efficient data communication mechanisms is therefore, a major key to maximizing the life-lime of wireless sensor networks. This challenge is magnified for visual sensor networks where the collected and transmitted data is often very large and composed of multiple signals (Infrared signals, audio, video, ...) which have different and varying quality of service requirements (QoS). Motivated by this challenge, we investigate a forward error correction recovery mechanism for multi-path data transmission in wireless sensor networks. Based on this mechanism, we propose a fast algorithm for the trade-off between the end-to-end energy cost and reliability requirement of multi-path data transmission. Under the practical considerations of a fixed transmission power and a realistic modulation scheme, we derive the reliability and expected energy cost metrics of transmission paths. We then demonstrate the efficiency of our algorithm through simulations and discuss future work.
Event detection and event localization are inherent tasks of many wireless sensor network applications. The inaccuracy of sensor measurements on the one hand and resource limitations on the other make efficient event ...
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Event detection and event localization are inherent tasks of many wireless sensor network applications. The inaccuracy of sensor measurements on the one hand and resource limitations on the other make efficient event localization a challenging problem. In this paper we propose a fully distributed localization scheme that consists of two algorithms. The distributed election-winner notification algorithm (DENA) performs the determination of the closest sensor node to an event and notifies all other nodes about that winner. The intensity-based localization algorithm (ILA) provides a signal independent position estimation of the event and is calculated at the winner node. The novelty of the ILA algorithm is its independence from the kind of signal emitted by an event. In contrast, it solely requires knowledge about the intensity of an event. The location of an event can thus be estimated without pre-knowledge about the nature of the event and with fewer constraints on the sensor hardware. These properties constitute the practicability of the algorithm in generic applications.
In this paper a new distributed platform is proposed. The aim of the platform is providing a very simple environment which is able to share the media required in a synchronous e-learning session or in a video conferen...
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Wireless sensor networks are often studied with the goal of removing information from the network as efficiently as possible. However, when the application also includes an actuator network, it is advantageous to dete...
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In this paper, we propose a relay shift based approach to solve uneven sensor distribution problem due to the initial random dropping or the existence of faulty sensors. The distinguishing feature of our work is that ...
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ISBN:
(纸本)3540380914
In this paper, we propose a relay shift based approach to solve uneven sensor distribution problem due to the initial random dropping or the existence of faulty sensors. The distinguishing feature of our work is that the sensors in our model have limited mobility. After determining the optimal cluster head positions by particle swarm optimization (PSO) method, we use proposed Relay Shift Based Algorithm (RSBA) for movement assisted sensor deployment. Dijkstra's algorithm is applied to find a shortest path from a redundant sensor to a virtual node point in an uncovered area, and each sensor moves along this path by relay shift based on the principle that evenly distributedsensors can provide better coverage. Simulation results show that our approach can provide high coverage within a short time and limited movement distance as well as ensuring connectivity and energy efficiency.
In hierarchical sensor networks, sensor nodes are arranged in clusters, and higher-powered relay nodes can be used as cluster heads. The scalability and the lifetime of sensor networks are affected by the limited tran...
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ISBN:
(纸本)9781424404247
In hierarchical sensor networks, sensor nodes are arranged in clusters, and higher-powered relay nodes can be used as cluster heads. The scalability and the lifetime of sensor networks are affected by the limited transmission range and battery power of the nodes. Proper techniques for assigning sensor nodes to clusters have been shown to improve the lifetime of the network. Previous approaches to clustering focus on different heuristics to achieve load balancing. In this paper, we have proposed two fast and efficient integer linear program (ILP) formulations for assigning sensor nodes to clusters in a two-tiered network, where the relay nodes are used as cluster heads. The first is for single hop routing and the second is a generalized formulation that can be used with any multi-hop routing strategy. The objective, in both cases, is to maximize the lifetime of the relay node network. We have tested our formulations with a number of different routing strategies, and for each case, we have compared our formulation to several existing heuristics for clustering. T he results demonstrate that our ILP's consistently outperform the heuristics and are fast enough to be used for practical networks with hundreds of sensor nodes.
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