Faezeh Sadat Babamir

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In this paper, we propose aggregate signcryption for achieving data security in UWSNs. The main challenge of these networks established in sensitive environments is offline sink visiting. Moreover, the sensors must retain collected data for long enough time to offload them onto the itinerant sink. Thus, the unattended nature of data collection intervals(More)
This paper aims to present a systematic method to: (1) specify high-level and event based real-time requirements and (2) map the specified requirements to low-level and state-based one. The former indicates the external system behavior while the latter indicates the internal one, which the external behavior are specified in environment events and the(More)
Wireless sensor networks are employed in several applications, including military, medical, environmental and household. In all these applications, energy usage is the determining factor in the performance of wireless sensor networks. Consequently, methods of data routing and transferring to the base station are very important because the sensor nodes run(More)
This paper examines the optimization of the lifetime and energy consumption of Wireless Sensor Networks (WSNs). These two competing objectives have a deep influence over the service qualification of networks and according to recent studies, cluster formation is an appropriate solution for their achievement. To transmit aggregated data to the Base Station(More)
Energy is one of the most important items to determine the network lifetime due to low power energy nodes included in the network. Generally, data aggregation tree concept is used to find an energy efficient solution. However, even the best aggregation tree does not share the load of data packets to the transmitting nodes fairly while it is consuming the(More)
In this paper, we describe an interactive approach to design mobile sensor networks. The node-mobility aspect requires an online or interactive algorithm to determine the optimal network-coverage solution for a given area of interest. Hence, we develop a real-time genetic algorithm to find the suitable direction of node locomotion, considering either(More)
One of the main design issues for wireless sensor networks is the node placement (NP) problem. This paper investigates the optimization of Wireless Sensor Networks (WSNs) layout. All sensor nodes in the environment are required to be connected to high-energy level nodes which operate as relay from environment to base or ground to a satellite in order to(More)
In this study, we propose an efficient aggregate signcryption scheme to maximize the security of data in a kind of wireless medical network named the disconnected or unattended wireless sensor network (applied in medical systems). These networks address patients who need to be monitored for a long time. The main challenge of these networks that are usually(More)