Review: The article is devoted to the development of methods for assessing the effectiveness of work collectives on the basis of social networking technologies. The main purpose of the methods being developed is to assess the effectiveness of employee interaction in the work processes. Various methods for analyzing social networks are considered, a number of key metrics have been obtained on the basis of which analytical and visual models of social networks have been built - sociograms. The paper briefly presented the main characteristics and principles of the social network, the technological process and their components. the review of the basic mechanisms of working with these concepts was conducted, and the notion of analysis of social networks and its main types was studied. Next, 4 basic types of metrics obtained in social network models of different work processes for measuring performance were formalized and described in detail. In the course of the work social networks and their graphical, numerical display on the basis of real log files of events of various organizations from different spheres were constructed. Models and calculations were carried out within the framework of ProM software. Based on the constructed social networks, the main types of metrics were obtained and analyzed, their comparison was made for different types of events, different spheres of companies. Based on the comparison of results, the main advantages and disadvantages of the effectiveness of the organization of the working process of the companies and individual participants in the process, in particular, were revealed.

Keywords: efficiency, technological process, node, networks, analysis, social network analysis, work of employees, interaction, metrics, log file

Review: The subject of the study are algorithms for the interaction of mobile stations for sharing a wireless channel with a wireless access network with token access. The object of the study is a wireless network with token access. The author considers in detail such aspects of the topic as combining the technologies of local computer networks: the IEEE 802.11 wireless technology standard (Wi-Fi technology) and Token Ring Token ring technology, describing the interaction of mobile stations for sharing a common broadcast channel. The research methodology combines methods of system analysis, informatics, reliability theory, queuing theory theory, information-logical design, mathematical modeling. The main conclusions of the study are the algorithms of wireless interaction of mobile stations for sharing a broadcast channel, providing a reliable (by the criteria of limited delay and reserved bandwidth) communication, reducing the number of retransmissions due to the fact that each station in turn uses the channel for equal periods and is forced to abandon the right to transfer after the expiration of the time allocated to it and provide resistance to node failure and automatic recovery from failures.

Keywords: communication reliability, computer network, broadcast channel, network ring technology, wireless communication, marker access, mobile station, wireless network, local area network, wireless interaction

Review: The article presents the results of analytical modeling of mobile communication systems 4G. The purpose of this study is to evaluate QoS performance in an LTE network channel. As a simulation tool, the mathematical apparatus of queuing networks (SEMO) was chosen, which proved its effectiveness for calculating the characteristics of infocommunication systems of various purposes and of any dimension. The author examined various research methods, further on the basis of the evolutionary system architecture of LTE, a conceptual, algorithmic and programming model was developed in the form of a closed homogeneous SemOI and its characteristics were calculated. The mean value analysis method was adapted to obtain network quality parameters with LTE technology. During the simulation, the probabilistic-temporal characteristics of the service process in the fourth-generation mobile communication systems were obtained: the transmission delay and the network capacity for a different number of active users, represented in the form of dependency curves from the input load. The results can be used both for designing new ones and for efficient traffic management in existing mobile networks.

Keywords: LTE, delay, mobile systems, QoS, quality of service, queuing systems, queuing networks, modeling, Mean Value Analysis, throughput