Tomasz Holynski

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Focusing on the principles and the paradigm of OBS an overview addressing expectable performance and application issues is presented. Proposals on OBS were published over a decade and the presented techniques spread into many directions. The paper comprises discussions of several challenges that OBS meets, in order to compile the big picture. The OBS(More)
This paper concerns optical burst switching (OBS) networks with combined nodes which function as both edge and core nodes. In such architecture, we propose intermediate electronic buffering of transit burst traffic. As our simulations show, this buffering, when applied in a restricted manner, decreases the overall burst blocking probability in the network(More)
This paper reports extensive simulations of the dynamic routing techniques for optical burst switching (OBS) networks. It gives a summary of the already proposed algorithms and describes more broadly some of them. It introduces also a new one called the Weighted Link Congestion and Frequency (WLCF) algorithm. Our comparative simulations are performed using(More)
This paper concerns quality of service in optical burst switching realized by dynamic wavelength grouping. It reports detailed simulations of this method in presence of combined edge-core nodes using special scheduling algorithm. Specifically, we are interested in optimal partitionings of wavelengths among traffic classes of high and low priority. We(More)
This paper contributes to recent improvements in energy-efficient clustering algorithms for static and homogeneous wireless sensor networks. We propose a modified algorithm, called NREC, which considers information on the locally normalized residual energy of sensor nodes. This information is weighted with the probabilistic threshold used in standard(More)
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