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Widely used computer systems have always become a target for different type of attacks. With the specifications of easiness in deploying and setting up low cost and low power consumption systems, Wireless Sensor Networks (WSN) have also become a specific target for attackers. The WSNs, which consist of sensor nodes that sends information they perceive and forward to a base station/sink, cannot be...
Estimating the positions of sensor nodes precisely is one of the major tasks in Wireless Sensor Networks (WSN). Due to the limited hardware resources and the energy capacity it is necessary to develop energy-aware localization algorithms. Here we present a new technique to convert the complex non-linear least squares calculation and distribute the tasks over the network effectively. Our proposed algorithm...
Localization of sensor nodes has become a fundamental requirement for many applications over Wireless Sensor Networks (WSNs). In this paper, we propose a range-free approach based on the Received Signal Strength (RSS) changes. A discrete and probabilistic localization method is offered to localize a moving beacon relative to sensor nodes. In this method we came to a more reliable and accurate result...
The applications of wireless sensor networks proliferated in the recent years. For specific applications, due to the large number of sensors deployed, wireless sensor networks can be seen as elements of infrastructure. As many elements of infrastructure are designed and operated considering the systems engineering life cycle process, so, too, the systems engineering process is appropriate for the...
The definition of a localization system among sensor nodes is a fundamental issue for many applications of wireless sensor networks (WSNs). Because sensor networks may be deployed in inaccessible area the position of sensor nodes may not be predetermined. Thus, a localization system is required in order to provide position information to the nodes. The cost and limited energy resource associated with...
In sensor network there are no nodes or servers that are exclusively responsible for packet forwarding and routing. Instead, sensor nodes participating in network communications perform these activities. Thus, they are vulnerable to the alteration and forgery of message in the process of packet forwarding and routing. To solve this problem, a security to ensure authentication and integrity of routing...
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...
Underwater Acoustic Sensor Network (UASN) is the enabling technology for real-time underwater monitoring and data collection. The costly underwater trials and unknown underwater acoustic modem infrastructures increase the need and importance of a reliable network simulator for UASNs. The underwater acoustic propagation method used in the channel modeling is the one of the determining factors influences...
This paper presents a scheme, in which the collaborative efforts of limited number of sensor nodes provide the social guidance for localization process to be used for uniform distribution of the clusters, over the network area. Utilizing the information provided in the form of gbest value and the direction for position update as social guidance, the sensor nodes localize them iteratively adjusting...
A number of important characteristics of wireless sensor networks such as the lifetime, connectivity and coverage are determined the residual power levels of the nodes in the network. This paper presents a general framework for modeling the availability of power at sensor nodes as a function of time. Models are developed for sensors with and without battery recharging and expressions are derived for...
Wireless sensor networks offer significant improvement over traditional sensor networks. Wireless sensor network (WSNs) consists of small sensor nodes, which are capable of sensing, processing and wireless communication capabilities. Recently Context-aware computing is an area of interest in WSN's. Context aware computing (CAC) is a paradigm in which applications make use of contextual information...
Existing localization algorithms in Wireless Sensor Network (WSN) can be divided into two categories: range-based and range-free. Most of the range-based localization algorithms proposed made use of the Received Signal Strength Indication (RSSI) to make an estimation of the distance between transmitter and receiver. Based on our experiments, there is no relationship between RSSI and distance in indoor...
We address the issue of network lifetime maximization for a special class of wireless sensor networks namely, wireless multi-media sensor networks. High data rates, in these networks at the sensor nodes, compared to the conventional sensor networks and the presence of high temporal correlation in the sampled data make them a suitable candidate for the in-network processing, primarily at the sensor...
Using controlled mobile elements is a promising approach to collect data from sensor nodes. It is very important to calculate a number of near-optimal routes for the fusion nodes that incrementally collect the data. Based on the multi-tier mobile network model, a new moving control strategy is proposed. This method first divides the monitoring field into several sub-regions so that fusion nodes can...
In wireless sensor networks, secure and efficient routing is very important. But its realization is difficult because of the limited resources of sensor nodes and the many routing factors. In order to realize secure routing, shorten the delay and prolong the life of the network simultaneously, we make two efforts in this paper. The first is building a trust model based on the ratio of packets delivery,...
In most sensor network applications, the information gathered by sensors will be meaningless without the location of the sensor nodes. Node localization has been a topic of active research in recent years. Accurate self-localization capability is highly desirable in wireless sensor network (WSN). This paper proposes a genetic simulated annealing algorithm based localization (GSAAL) algorithm for WSN...
The existing researchers on security for sensor networks have mostly concerned about only reconfiguration or only rejuvenation or both mechanisms for adaptation of sensor networks. In this paper we employ self-regenerative software components in order to perform optimal software rejuvenation in wireless sensor network with a view to increase the availability of sensor nodes in sensor networks. Here,...
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