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Energy Consumption and Fault Tolerance in the MAC Protocols for WSN

Journal of Computer and Communications 2015年第6期3卷 118-130页

作者： ridha azizi Computer Technology Department High Institute of Technological Studies of Sousse (ISET) Sousse Tunisia

Wireless sensor networks are currently experiencing widespread enthusiasm in the field of research, mainly because of the great benefits they promise in terms of flexibility, cost, range and robustness. In addition, such networks find use in a wide variety of applications, for example in collecting remote data, type of climate monitoring, seismic activity, or in other areas such?as home automation and medical. Unfortunately, their disadvantages are up to their promises. Indeed, the sensor nodes are subjected to high energy consumption constraints due to their compact size as well as the deployment environment. Frequent replacement of batteries is excluded in a field that can be difficult to access. Therefore, the main challenge remains as a result of miniaturization and reduces power consumption to maximize network lifetime. The objective of this work is to make a thorough study of the energy consumption in wireless sensor networks. The study points are addressed at the media access protocol or MAC protocol.

关键词： Wireless Sensor Networks Fault Tolerance MAC Protocol Suitable for WSN

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Intelligent System of M-Vision Based on Optimized SIFT

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Journal of Computer and Communications 2016年第4期4卷 52-62页

作者： Sameh Ben Hamida ridha azizi Alia Maaloul Institute of Higher Technological Studies of Gabes Gabes Tunisia Institute of Higher Technological Studies of Sousse Sousse Tunisia

This paper proposes the recognition of bank notes through a mobile intelligent vision system under Android and this, based on an approach of artificial vision of images using the SIFT algorithm under OPENCV whose principle is to detect the remarkable points of this image and compare it with the image saved in the local database on a handheld device. Finally, the system informs the user of the result by a sound indicating the value of the currency detected. The SIFT algorithm proposed can achieve a higher percentage of identification in a reduced time compared to results achieved by classic SIFT.

关键词： Android Image Recognition Open CV SIFT

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Optimised Migrate Virtual Machine Rejuvenation

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Journal of Computer and Communications 2015年第8期3卷 33-40页

作者： Sanheji Manel azizi ridha Maaloul Alia Institute of Higher Technological Studies of Gabes Gabes Tunisia Institute of Higher Technological Studies of Sousse Sousse Tunisia

Server virtualization is an essential component in virtualized software infrastructure such as cloud computing. Virtual machines are generated through a software called virtual machine monitor (VMM) running on physical servers. The risks of software aging caused by aging-related bugs affect both VM and VMM. As a result, service reliability degrades may generate huge financial losses to companies. This paper presents an analytic model using stochastic reward nets for time-based rejuvenation techniques of VMM and VM. We propose to manipulate the VM behavior while the VMM rejuvenation is according to the load on the system. Using a previous Petri net model of virtualized server, we performed an algorithm in order to optimize rejuvenation technique and achieve high availability. So we perform Migrate-VM rejuvenation or Warm-VM rejuvenation while there are current jobs in the system. Although Migrate-VM rejuvenation is better than Warm-VM rejuvenation in steady state availability, it can’t be always performed as it depends on the capacity of the other host. When the queue is empty and the virtual machine has no current jobs to serve, we propose to combine both VMM rejuvenation and VM rejuvenation. We show that the proposed technique can enhance the availability of VMs.

关键词： Component Availability Data Center Rejuvenation Virtual Machine Petri Net

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