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Event source anonymity is potentially an important aspect of secure wireless sensor networks (WSN). The existing schemes developed for wired networks do not work in WSNs due to the characteristics of radio transmission and limited resources. A recent article proposed several solutions for the strong global adversary model. The protocols depend on dummy messages and special proxy nodes that filter...
This paper proposes a novel algorithm to improve the lifetime of wireless sensor network. This algorithm employs compressive sensing in conjunction with Particle Swarm Optimization algorithm to decrease the communication rate and to build up the data aggregation trees respectively. We build up the data aggregation tree in a way that it can be utilized to maximize the efficiency by rectifying the delay...
Due to the broadcast nature of wireless channels, neighbouring sensor nodes may overhear packets transmissions from each other even if they are not the intended recipients of these transmissions. This redundant packet reception leads to unnecessary expenditure of battery energy of the recipients. Particularly in highly dense sensor networks, overhearing or eavesdropping overheads can constitute a...
Recent research shows that significant energy saving can be achieved in wireless sensor networks by using mobile elements (MEs) capable of carrying data mechanically. Though ME can reduce the energy consumption at each sensor node, it increases the latency from the time the data is generated at a node to the time the base station receives it. To address this issue, we proposed a collection-based approach...
Information collecting and sharing technologies in disaster areas is important, especially, collecting and sharing information of the damaged location and injured people in a building is important for prompt rescue operation. For that purpose, a method to build up a map of an unknown environment without a priori knowledge is necessary. However, as a map must be explored by multiple autonomous robots...
Reliable delivery of data is a classical design goal for reliability-oriented collection routing protocols for ad hoc wireless sensor networks (WSNs). Guaranteed packet delivery performance can be ensured by careful selection of error free links, quick recovery from packet losses, and avoidance of overloaded relay sensor nodes. Due to limited resources of individual senor nodes, there is usually a...
Real-time physiological monitoring of athletes during sporting events has tremendous potential for maximizing player performance while preventing burn-out and injury, and also enabling exciting new applications such as referee-assist services and enhanced television broadcast. Emerging advanced monitoring devices have the right combination of light weight and unobtrusive size to allow truly non-intrusive...
Many-to-one traffic pattern in wireless sensor networks (WSNs) causes significant performance degradation toward the sink. To mitigate this so called funneling phenomenon, researchers have proposed various mechanisms at different layers. In this paper, we consider batch forwarding or packet concatenation at network layer, and experimentally demonstrate how it improves the delivery ratio and end2end...
The objective of this work is to give an outline on qualitative and quantitative analyses of publish-subscribe model deployed over wireless networks. Examining performance of wireless networks transporting publish-subscribe based traffic gives us better understanding of potential impact of publish-subscribe networking to existing architecture. Our evaluation work focuses on studying the behavior of...
This work presents a distributed time slot assignment algorithm which adopts TDMA as Medium Access Control, specially suited to support applications with strict delay, jitter and throughput requirements characterized by convergecast traffic patterns in sensor networks. (E.g. wireless video surveillance sensor networks). Our algorithm has three characteristics: (1) Every node is guaranteed a path to...
This paper considers on-off random access channels where users transmit either a one or a zero to a base station. Such channels represent an abstraction of control channels used for scheduling requests in third-generation cellular systems and uplinks in wireless sensor networks deployed for target detection. This paper introduces a novel convex-optimization-based scheme for multiuser detection (MUD)...
Wireless sensors networks (WSN's) have a lot of ability for spreading in the areas where wired networks can't operate correctly and old versions of wireless networks aren't useful. WSN's consist of many sensors that place in an unavailable area. The method of routing to transform information from sensor nodes to the Base station is very important and one of the main needs of WSN is the best method...
After discussing the drawbacks of localization algorithm for stationary or slow speed target in WSN, new algorithm based on precise propagation time delay measurement is introduced. Mechanisms for time sampling and TOA measuring procedure are described in detail, which make the measurement error equivalent to CPU instruction cycle. The effect of NLoS is considered in location calculation procedure,...
The main contribution of this paper is the design and test of a simple, reliable, and energy efficient routing scheme for sensor networks that successfully meets the goal of network longevity, and that demonstrates satisfactory robustness and network lifetime. The proposed routing algorithm allows a child sensor node dynamically searches for a new reliable parent node with more residual energy and...
Data communication in sensor networks can have timing constraints like end to end deadlines. If the deadlines are not met either a catastrophe can happen in hard real time systems or performance deterioration can occur in soft real time systems. In real time sensor networks, the recovery of data through retransmission should be minimized due to the stringent requirements on the worst case time delays...
In sparse mobile sensor networks, nodes have a small number of neighbors with intermittent connectivity. This paper presents a new networking protocol for this type of network, aimed at maximizing system performance in terms of both delay and reliability. The system is motivated by the observation that many applications on this type of network have two kinds of co-existing data packets: those with...
This paper addresses support for energy efficient single-hop communications in Environmental Monitoring Wireless Sensor Networks (WSN). The main contributions are twofold firstly; the identification of scenarios where single hop communication, between multiple sensors and a base station is both feasible and offers benefits with respect to power preservation. Secondly, the design implementation and...
Survivability represents an important property of an information system which must withstand devastating malicious attacks and system failures, as well as continuously provide essential services to users. In this paper, we qualitatively analyze a system's states under different levels of attacks with varying system recovery abilities. Then, we use Colored Petri Net tools to simulate and measure the...
This paper proposes an autonomous energy saving method that works on wireless sensor networks. Wireless sensor nodes are equipment for gathering information about the user's surrounding environment. An energy-efficient data gathering system is required because each node is battery powered. Our method autonomously reduces the sampling frequency for monitoring environments whose condition may vary rapidly...
The use of opportunistic communications, while increasing in popularity, is still limited, due in part to some uncertainty that still exists regarding its performance in real-world conditions. This paper tries to assess the real performance of an opportunistic routing implementation in a physical setting, by comparing it with its expected performance, determined by a simplified theoretical model....
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