Wireless Sensor Networks (WSNs) are being used extensively today in various domains. However, they are traditionally deployed with applications embedded in them which precludes their re-use for new applications. Nowadays, virtualization enables several applications on a same WSN by abstracting the physical resources (i.e. sensing capabilities) into logical ones. However, this comes at a cost, including an energy cost. It is therefore critical to ensure the efficient allocation of these resources. In this paper, we study the problem of assigning application sensing tasks to sensor devices, in virtualized WSNs. Our goal is to minimize the overall energy consumption resulting from the assignment. We focus on the static version of the problem and formulate it using Integer Linear Programming (ILP), while accounting for sensor nodes' available energy and virtualization overhead. We solve the problem over different scenarios and compare the obtained solution to the case of a traditional WSN, i.e. one with no support for virtualization. Our results show that significant energy can be saved when tasks are appropriately assigned in a WSN that supports virtualization.
In the recent work environment, any firm or organization can't guarantee the achievement of its strategic goals, that is, its success without utilizing IT well, so the IT became the object of main attention, and the reliance on the IT gets more intensified in all business fields. Therefore, each firm and public institute take enormous efforts for setting their internal audit systems appropriate for the recent business environment. Especially as the Public Audit Act began to take in effect from 2010, its raised the necessity to develop a new internal audit administration meeting a more advanced internal audit body's role and its status as well as the changes in the administration different from the past administration. Reflecting the past, the existing internal audit activities have done around the post-exposure approaching to the known risks or a kind of fragmentary checkup around samples. Besides, the existing internal audits have focused on pointing out the organization's problems and controlling them. So the organization being audited did not fully accept the internal audit results and there were also some aspects not meeting the internal customer's needs. Therefore this study aimed to propose an improved model of audit information system supporting the recent audit trends (enhancing the efficiency of work process and consulting) in order to draw out a more strategic improvement plan after analyzing the status quo of public firms' internal audits and their problems through the review of existing studies and literature about the theme.
The expeditious growth of the wearable and implantable body sensors and wireless communication technologies have provided both inspiration and motivation for increasingly development of m-healthcare information systems as a promising next generation e-health system. In m-healthcare systems, the authorized mobile patients with the same disease symptoms can constitute a social group to share their health condition and medical experience. The privacy of social communication transferred over open wireless channels is an essential system requirement. Furthermore, the m-healthcare system on contrary to the traditional e-Health system allows mobile patients to move across distinguished location domains during different time periods. The mobility of patients considerably increases the cost of key management in terms of communication overhead if it is addressed with a naïve solution such as treating as a leave in the old location and a new join in the visited location. This paper proposes a privacy-preserving scheme, which maintains the secrecy of patients’ personal health information using secure group communication in m-healthcare information systems while supporting mobility of patients. The scheme is highly scalable, and treats patients’ mobility with the minimum rekeying cost, as such efficiently preserve secrecy of communication between patients associated with a social group. The security properties of the proposed scheme as well as its performance based on simulation experiments are evaluated. The experimental results demonstrate that the proposed scheme outperforms the existing solution in terms of communication overhead.
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