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Intelligent and autonomous SDN applications need to monitor the network state in order to take appropriate actions. In this letter, we compare the impact of active and passive network state collection methods on an SDN load-balancing application running at the controller. We do this comparison through: (1) the results of a mathematical model evaluation we(More)
In this paper, we introduce the use of adaptive controllers into software-defined networking (SDN) and propose the use of adaptive consistency models in the context of distributed SDN controllers. These adaptive controllers can tune their own configurations in real-time in order to enhance the performance of the applications running on top of them. We(More)
The accuracy of the simulation results which are calculated from the current network simulators is suspicious when compared to real network's test-bed. Thus there is a great need to a low cost solution that gives accurate results and takes into consideration the special needs of wireless sensor networks. In this paper, we try to overcome the limitations of(More)
Distributed controllers are oftentimes used in largescale SDN deployments where they run a myriad of network applications simultaneously. Such applications could have different consistency and availability preferences. These controllers need to communicate via east/west interfaces in order to synchronize their state information. The consistency and the(More)
Increasing amount of image data raises the importance of content based query systems. Increasing hardware capacity and improving methods makes development of such systems more feasible. In this study, we aim to develop a content based image retrieval for renal (kidney) scintigraphy images. For this purpose, problem analysis, literature survey, data(More)
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