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Previous key management methods are not adequate for secure data communication through cluster-based routing. Because the cluster head is changed at each round in cluster-based routing, it has to take the step of authentication or shared key setting with each member node. In addition, because most of previous key management mechanisms do not assign mobility to all nodes in the sensor network, there...
Due to the increasing oil prices, reducing the weight of future cars will be important. One way to do this is by replacing wired sensors and their cables with wireless sensors. This could reduce the weight of cars, thus improving fuel efficiency. The replacement is anticipated to reduce the weight of an average passenger vehicle by up to 50 kg. However, such a replacement raises security concerns...
In energy constrained wireless sensor networks, node scheduling is an effective approach to improving the energy efficiency and prolonging the network lifetime. In this paper, we propose a distributed, lightweight, and location-unaware scheduling scheme for randomly deployed wireless sensor networks. The basic idea of the scheduling scheme is to organize sensor nodes into disjoint node sets, which...
Energy efficiency is a critical consideration in the design of low cost sensor networks. This paper studies the problem of extending the lifetime of the sensor networks as far as possible while maintaining the quality of network coverage. A systematical analysis on the relationship between the network lifetime and cover sets alternation is given, and by introducing the concept of time weight factor,...
The behavior of sensor networks is highly unpredictable because of randomness in individual node state and network structure. When a node fails, the packets transmitted to this faulty node is dropped if it is not cached by an operational node. In this paper some analytical models based on fault tolerance mechanisms have been proposed to be used in different aspects of caching a packet regarding this...
This paper examines the current state of underwater sensor networks (UWSN) technologies and explores the nature of dynamic emissive power applicable therein. Based on the fact that sound speed increases towards the seafloor with higher depth pressure or the sea surface with warmer temperature in the underwater, we propose a number of efficient ways of utilizing power strength to control output sound...
We consider the rate allocation problem for data aggregation in wireless sensor networks with two objectives: 1) maximizing the lifetime of a local aggregation cluster and 2) achieving fairness among all data sources. The two objectives are generally correlated with each other and usually they cannot be maximized simultaneously. We adopt a lexicographic method to solve this multi-objective programming...
Most wireless sensor network (WSN) architectures involve clusters of sensor nodes reporting their sensed data to base stations or sink nodes, and end applications access sensor data from the sink nodes through service-oriented paradigms. One of the key challenges involved in the design of WSN applications through such architectures is the need to conserve the energy of batteries used to power sensor...
In this paper, an energy efficient adaptive modulation scheme is proposed for a wireless cognitive radio ad hoc network, where each node is equipped with cognitive radio and the network is an OFDMA system operating on time slots. In each slot, the users with new traffic demand will sense the spectrum and locate the available subcarrier set. Then they choose subcarriers with favorable channel condition...
Data aggregation is an essential paradigm for energy efficient routing in energy constraint wireless sensor networks (WSN). Data aggregation in WSN can be treated as searching for the Minimum Steiner Tree (MST) including source nodes and sink node. In this paper, we propose a Data-aggregation Algorithm based on Adaptive Ant Colony System (AACS) algorithm. In this algorithm, Directed Diffusion (DD)...
Due to resource constraints, digital image transmissions are a significant challenge for image sensor based wireless sensor networks (WSN). In this paper, we propose a novel robust and energy-efficient scheme, called image component transmission (ICT) in WSN by providing various levels of reliability during image transmissions. Essential components such as the information for the positions of significant...
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