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In large scale Wireless Sensor Networks (WSNs), the random deployment of the sensor nodes does not guarantee the desired level of the area coverage especially when the network is sparse. One of the solutions to overcome this problem is to use a mobile robot that is equipped with, in addition to the sensing unit, an actuator unit that controls its movement. In this case, the mobile robot is considered...
Various clustering protocols for ad hoc networks have been proposed in order to optimise the networks energy efficiency. These protocols rely on the formation of highly dense clusters which resulted in a large variation of cluster size and thus suffers from a poor load balancing. This paper introduce a novel distributed clustering algorithm using fuzzy logic for the formation of uniform size clusters...
Supporting mobility in wireless sensor networks is one of the major requirements for future Internet of Things (IoT) applications. This work focuses on optimizing the objective function of Routing Protocol for Low-power and Lossy Networks (RPL) in mobile applications. RPL routing is the most common standard routing protocol designed for IoT applications. We optimized RPL objective function by combining...
Event-driven wireless sensor networks (WSNs) are equipped with the sensor nodes which are able to capture the vital changes in the measurements and report them to the base station. Due to the nature of harsh and unattended environments, it is impossible to install sensor nodes manually. Therefore, a random deployment fashion such as by aircraft is required. However, with high probability, sensor nodes...
With the advent of the Internet of Things (IoT) and its need to boost cooperation between different objects in order to improve the quality and the completeness of the produced information, it is important to understand and to evaluate data which comes out and goes into each thing. In this paper we propose CACHACA, a ranking mechanism for Sensor Networks that facilitate the discovery of services provided...
The nodes in wireless sensor networks are broadcasted randomly causes the distribution of the nodes and the clusters asymmetrical. This situation affects performance of networks. The power control technology of cluster heads was needed to optimize framework of networks. However, it is difficult to set up mathematic modeling. Therefore the power control technology in wireless sensor networks is proposed...
Zadeh, mamdani and TSK are proposed different fuzzy conditional inferences for “if … then …” to approximate with incomplete information. The Zadeh and mamdani fuzzy conditional inferences are require prior information for consequent part. The TSK fuzzy conditional inference need not know prior information for consequent part but it is difficult to compute. In this paper, new methods are proposed for...
Recent advances in the field of wireless networks have entailed collateral growth in the number of possible malicious attacks against them. A significant amount of work has been done towards ensuring security of a class of such networks, namely, Wireless Sensor Networks. Considering the untrusted environments of operations of such networks, the threat of distributed attacks against constrained resources...
In our latest work, we developed a data fusion algorithm which can be applied on fusion centers of a cluster-based wireless sensor network (WSN). The data fusion algorithm is a mathematical model based on fuzzy logic theory. In fuzzy logic, a collection of objects is processed using fuzzy sets to obtain a value, which summarizes the collection. In this paper, we examine the effects of imprecise WSN...
Nodes in a sensor network possess minimal computational, storage and communications resources as well as limited energy supplies. Consequently implementing security mechanisms such as encryption is expensive in such networks. Typically a node will employ security mechanisms at all times. If a node can invoke defense mechanisms only when it is under threat from a malicious attacker, resources can be...
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