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The evolution in the microelectronics and embedded systems has expanded the employment of Wireless Sensor Networks (WSNs). The energy limitation of the nodes is a very important restriction of those structures and should be always considered during the network design. The search for energy-efficient WSNs must take into account aspects which are essential for the proper operation of the network, such...
In the development of various large-scale sensor systems, a particularly challenging problem is how to dynamically organize the sensor nodes into a wireless communication network and route sensed information from the field sensors to a remote base station. This work presents a new energy-efficient dynamic clustering technique for large-scale sensor networks. By monitoring the received signal about...
This paper presents the design and evaluation of a novel adaptive sampling algorithm for reducing energy consumption in data acquisition and communication subsystems of a wireless sensor node. The algorithm uses isochronous measurements of the frequency content of the signal as the basis for adaptively varying the sampling rate. This allows signal acquisition at the minimum rate without sacrificing...
In this paper, we propose a novel application problem in wireless sensor networks. It is the real-time data forwarding for mobile target tracking problem. It mainly focuses on routing the sensing data from multiple sources to multiple sinks with the consideration both of energy conservation and latency limitation. This problem is proved to be NP-complete. We propose three different heuristic methods...
With the further development of sensor techniques in wireless sensor networks (WSNs), it is becoming urgent that they should be able to support complicated queries like skyline query for multi-preference and decision making. In this paper, we consider skyline query evaluation in WSNs by devising evaluation algorithms for finding skyline points on a dataset progressively. The core techniques adopted...
It is important to increase the wireless sensor networks (WSNs) lifetime and the ability of energy conservation, due to its limited energy resource, while meeting the constraints of applications. In this paper, we concern the protocol and OS task schedule perspective to enhance the performance of WSNs. Firstly we propose a diverse-rate based upon pre-schedule schedule to further decrease collisions...
For monitoring burst events in reactive wireless sensor networks (WSNs),an novel energy-efficient dynamic voting cluster (EE-DVC) algorithm is proposed. EE-DVC has three obvious features: Firstly, it adopts virtual grid ideas to divide each cluster into MtimesN square area and select a working node in each grid to reduce redundant information and save energy. Secondly, cluster head is dynamic voted...
A combined algorithm is required to select an optimal set of sensors, satisfying the conditions of coverage and connectivity. Since topological changes have significant impact on the coverage quality, there is a need for dynamic coverage maintenance algorithms. In this paper, an energy efficient distributed connected coverage (EEDCC) algorithm and a set of dynamic coverage maintenance (DCM) algorithms...
In recent years, wireless sensor networks have received great interest with rapid developments in both hardware and software aspects. However, there is always a problem with limited energy supply for the tiny sensor node. In wireless imaging sensor network in which imaging devices are utilized, the bottleneck of energy consumption efficiency is even more serious. The main activities of such imaging...
A wireless sensor network (WSN) consists of a large number of sensor nodes which are deployed over an area to perform local computations based on information gathered from the surroundings. Each node in the network is equipped with a battery, but it is almost very difficult to change or recharge batteries; hence, maximizing the lifetime of the network through minimizing the energy is an important...
A principal factor in sensor network design is energy efficiency. In this work, we propose to extend the lifetime of sensor networks using appropriate choice of sensor node distribution. The key idea of our scheme is to deploy more nodes in areas of extensive energy usage. Using this scheme of sensor node distribution, we use probabilistic angular routing to route data packets from the sensor nodes...
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