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Many access control models have been proposed in the literature, and they have been extensively studied under the acronyms of DAC, MAC, RBAC, ABAC, etc. Each of these models has been studied in isolation, but some real-life situations need elements of several of them, in order to properly express data protection needs of complex organizations. A formal framework is presented, that allows not only...
In wireless sensor network, a large number of cheap nodes are deployed in the uncontrollable environment. Therefore, the fault probability of sensor nodes in wireless sensor network is much greater than that in traditional network. According to the impact model, the impact of one event is significantly dependent on the distance between the sensor and event source. So in this paper, we propose a wireless...
As Energy Harvesting Devices (EHD) become more widely deployed in sensor network platforms, the need arises for "smart" operation policies which can ensure long-term, autonomous and reliable operation. Existing research has relied on the implicit assumption of perfect knowledge of the energy available in the EHD. However, estimating the energy level of the batteries or super-capacitors employed...
We detail the hardware and software used to build a test-bed for a sustainable WiFi network serving a mission-critical application. A power management scheme is introduced that is based on a Markov Chain model, together with details of its practical implementation and realization on the solar-powered WiFi network. The power management scheme consists of three main modules: an event trigger, a monitor...
The cellular network users are demanding more traffic and expecting a ubiquitous high data rate. Several techniques are investigated to cope with this massive demand. All the current solutions are focusing on improving this issue from the supply side. However it is expected that a significant improvement on the system performance can be gained if the end users become a part of the system and not just...
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