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In this paper it is shown that for substantial increase of video quality in wireless network it is necessary to execute two obligatory points on modernization of the communication scheme. The player on the received part should throw back automatically duplicated RTP packets, server of streaming video should duplicate the packets containing the information of key frames. Coefficients of the mathematical model describing video quality in wireless network have been found for WiFi and 3G standards and codecs MPEG-2 and MPEG-4 (DivX). The special experimental technique which has allowed collecting and processing the data has been developed for calculation of values of factors.

Network virtualization has become a fundamental technology to deliver services for emerging data-intensive applications in fields such as bioinformatics and retail analytics hosted at multi-data center scales. To create and maintain a successful virtual network service, the problem of generating a constrained path manifests both in the management plane with a physical path creation (chains of virtual network functions or virtual link embedding) and in the data plane with on-demand path adaptation (traffic steering with Service Level Objective (SLO) guarantees). In this paper, we define the virtual path embedding problem to subsume the virtual link embedding and the constrained traffic steering problems, and propose a new scheme to solve it optimally. Specifically, we introduce a novel algorithm viz., 'Neighborhood Method' (NM) which provides an on-demand path with SLO guarantees while reducing expensive over provisioning. We show that by solving the Virtual Path Embedding problem in a set of diverse topology scenarios we gain up to 20% in network utilization, and up to 150% in energy efficiency, compared to the existing path embedding solutions.

Abstract. In this paper, we propose a new method for detecting unauthorized network intrusions, based on a traffic flow model and Cisco NetFlow protocol application. The method developed allows us not only to detect the most common types of network attack (DDoS and port scanning), but also to make a list of trespassers' IP-addresses. Therefore, this method can be applied in intrusion detection systems, and in those systems which lock these IP-addresses.

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