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Industrial plants such as oil refineries typically use wired sensor systems to monitor and control the production processes. As the deployment and maintenance of such cabled systems are expensive, it is desirable to replace or augment these systems using wireless technology. Wireless sensor networks (WSNs) are deployed to sense, monitor and act on the environment. Especially in industrial sense and...
Wireless sensor and actor network (WSAN) is a new kind of heterogeneous wireless sensor networks. In WSANs, while sensors gather and send the sensing messages from the physical environment, actors need to take appropriate actions. Based upon the rich source actor, WSANs are increasingly deployed for accurately monitoring the environments subjected to critical conditions. The ordering of monitored...
In wireless sensor networks, it is important to minimize energy consumption of the sensor nodes. Energy consumption of sensor nodes can be reduced explicitly by making sensors sleep when they are idle. In this paper, we consider a single wake-up periodic schedule in that the sensor wakes up in one slot out of k slots. This results in every sensor node having a duty cycle of 1/k on an average. However,...
The advancement of electronic sensing devices, microcomputers and wireless communication devices has lead to creation of new smart sensors, which can monitor actuate, compute and communicate. Typically, these sensors are deployed in non-deterministic mode (randomly) when deployed in large numbers. These sensor devices have the capability to self-organize into the so-called Wireless Sensor Networks...
In wireless sensor networks (WSNs) used in monitoring applications, the need to provide real-time traffic with an appropriate QoS typically clashes with the energy consumption constraints of the nodes, which have to work for long periods without the possibility of replacing their batteries. When both energy and QoS constraints are present, the role of topology control mechanisms is fundamental. This...
Congestion in wireless sensor networks (WSNs) is an important issue. In this paper, a new method is presented to overcome congestion causes. Actually this is a hop-by-hop rate control approach. In our method, queue length of the nodes is monitored continuously. Then, based on a fuzzy inference system, admissible rate for upstream nodes is calculated based upon sensor nodes constraints. This method...
For application researches of the detection for the gas signal source, a method for orientation estimation of the gas signal source in the two-dimensional space and its algorithm are presented in the paper. In the method, a mode of dual-line gas sensor array is applied to sample the signals of the gas concentration in real time, and the time delay estimation, an approach of the signal processing,...
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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