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Localization is an important issue for Wireless Sensor Networks in a wireless sensor network. A mobile sensor may change its position rapidly and thus require localization calls frequently. It is important to control the number of localization calls, as it is rather expensive. The existing schemes for reducing the frequency of localization calls for mobile(More)
Localization is an important issue for Wireless Sensor Networks (WSN). We consider a WSN consisting of identical sensors. All known distances between the sensors are assumed to be less than the communication range of the sensors and all unknown distances greater. We also assume that the communication range is at least twice as much as the sensing range.(More)
Centralized localization dissipates a lot of energy in pooling the proximity information of the individual nodes. In contrast a distributed algorithm usually uses only local information at each node. Most localization algorithms available in the literature are are anchor based or they estimate the position of the sensors at the cost of losing accuracy. In(More)
A network is called localizable if the positions of all the nodes of the network can be computed uniquely. If a network is localizable and embedded in plane with generic configuration, the positions of the nodes may be computed uniquely in finite time. Therefore, identifying localizable networks is an important function. If the complete information about(More)
Finding the location of an object, other than sensor in a sensor network is an important problem. Here a technique is proposed to find the location of objects in a sensor grid. The locations of the sensors are assumed to be known. A sensor can only sense the number of objects present in its neighborhood. This small information injects low traffic in the(More)
Autonomous mobile robots are capable of moving through an environment where human access is difficult or impossible. Due to the low cost and long life cycle of a passive RFID tag, the identification of an object by passive RFID tags is gaining its popularity. Path (e.g., road) following by mobile robots based on paint line detection has recently been(More)
WSN have several inherent limitations. In several applications of WSNs each point in the field is required to be sensed by some sensors. A network of this type is called a sensing covered network. In random deployment, avoidance of holes (a region with no point within sensing range of nodes) is very difficult. We develop an efficient distributed technique(More)
  • A. Dey, B. Sau
  • 2016
In recent technological advances, RFID system is efficient for finding the position or identifying an object in an environment where direct human access is difficult or impossible. In this paper, we introduce 2-sensing covered (each point of the application field falls within the sensing zone of at least two readers) wireless networks of anchor-free RFID(More)
A distance based network localization determines the positions of the nodes in the network subject to some distance constraints. The network localization problem may be modeled as a non-convex nonlinear optimization problem with distance constraints which are either convex or non-convex. Existing network localization algorithms either eliminate the(More)
In this paper, we consider the problem of computing the algebraic paramet-ric equation of the Euclidean 1-center function in R d , d ≥ 2, for a system of n static points and m mobile points having motion defined by rational para-metric functions. We have shown that the corresponding Euclidean 1-center function is a piecewise differentiable function and have(More)