KEYWORDS: Data transmission, Data modeling, Systems modeling, Performance modeling, Networks, Computing systems, Computer networks, Network architectures, Data integration, Internet
The article presents the results of modeling and analysis of data transmission performance on systems that support quality of service. Models are designed and tested, taking into account multiservice network architecture, i.e. supporting the transmission of data related to different classes of traffic. Studied were mechanisms of traffic shaping systems, which are based on the Priority Queuing with an integrated source of data and the various sources of data that is generated. Discussed were the basic problems of the architecture supporting QoS and queuing systems. Designed and built were models based on Petri nets, supported by temporal logics. The use of simulation tools was to verify the mechanisms of shaping traffic with the applied queuing algorithms. It is shown that temporal models of Petri nets can be effectively used in the modeling and analysis of the performance of computer networks.
The paper presents the results of investigation of ns-laser pulse interaction with Ni-TiC sample. The present study investigates the effects of the irradiation parameters on the microstructure and surface in-situ composites obtained by the high temperature solution method (HTS). The obtained ingots were irradiated with Nd:YAG laser pulses (Quantel Brio, 4ns, 70mJ@1.06μm), focused with a lens of the focal length of 10 cm in air conditions. Microstructure of the laser irradiated in-situ composites was characterized by the Hirox digital microscope systems which made possible to observe a 3D microscopic images of the composite surface and structural changes after the series of laser irradiation. The study of melted crater ratio has been done on composites to investigate the effect of irradiation on composite surface microstructure. Microstructure of the Ni–TiC composites was also characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). According to experimental results and analysis, it was shown that the observed craters on surfaces were deepened with increasing numbers of laser shot. On the other hand, heterogeneity of samples had influence on the depth of the crater.
The paper presents the results of investigation of the effects of the irradiation parameters on the microstructure and surface in-situ Co-TiC composites obtained by the high temperature solution method (HTS). The obtained ingots were irradiated with Nd:YAG laser pulses (Quantel Brio, 4ns, 70mJ@1.06μm, focused with a lens of the focal length of 10 cm in air conditions. Microstructure of the laser irradiated in-situ Co-TiC composites was characterized by the Hirox digital microscope systems which made possible to observe a 3D microscopic images of the composite surface and structural changes after the series of laser irradiation. The study of melted crater ratio has been done on Co–TiC composites to investigate the effect of irradiation on composite surface microstructure. According to experimental results and analysis, it was shown that the observed craters on surfaces were deepened with increasing numbers of laser shot. On the other hand, heterogeneity of samples had influence on the depth of the crater.
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