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Документ Application of the sliding window mechanism in simulation of computer network loading parameters(Національний технічний університет "Харківський політехнічний інститут", 2020) Davydovskyi, Yu.; Reva, O.; Malyeyeva, O.; Kosenko, V.The subject of the study in the article is the data transfer processes in computer networks from the point of view of the network performance indicators, in particular, overload parameters. The purpose of the work is to create a simulation model of the behavior of a computer network, taking into account the mechanism of the "sliding window" and to demonstrate its work using a test example in combination with the previously proposed algorithms. The following tasks are solved in the article: analysis of the network as a complex multilevel system and isolation of the problems related to the transport layer of the OSI model; consideration of tasks that are solved by the transport layer of the data network; creation of the mechanism of modeling of functions of "sliding window"; demonstration of model work. The following research methods are used: basics of system analysis, models of network functioning, simulation modeling method. The following results were obtained: Based on the results of previous studies, the article proposes a new model of computer network behavior over a period of time. This model is based on the principles of simulation modeling, which became possible because of the certain fractal properties of incoming traffic, that is one of the initial data for the simulation. In the process of development, the seven-level OSI model was taken as the basic network model and its four lower levels were selected. Ensuring reliable information transmission at all protocol levels is based on the mechanisms of acknowledgement and "sliding window". The proposed model can reduce the amount of user data directly for each of the directions in a proportion directly proportional to their utilization of the specified congested channel. It is proposed to use a correction vector for each direction of information transmission in the model. Conclusions: The adequacy of the developed model is confirmed on the basis of practical calculations of the test case. The practical value of this model is the ability to predict bottlenecks when creating a computer network, or vice versa, to point out the redundancy of certain solutions in order to save significant funds in the future for providers and operators of communication services.Документ Models of making decisions to select the techniques for countering innovative project risks(Національний технічний університет "Харківський політехнічний інститут", 2019) Kosenko, V.The subject matter of the study is the risks of an innovative project. The goal of the article is to develop models of making decisions to select the techniques for countering innovative project risks. The following tasksare solved in the article: the features of managing innovative project risk are analyzed, a generalized model of the project risk management is developed, the mechanisms to counter the innovative risks are analyzed, a decision tree is developed to select the technique to counter innovative project risks, a formalized method and a process model are developed to select a preferred technique for risk insurance. The following methodsare applied – system analysis, project approach, risk-based approach, heuristic decision-making methods, process models. The following resultsare obtained: the analysis of the features of managing innovative project risks showed the possibility of reducing the cost of risk by modern techniques ofcountering financial risks, including insurance in its various forms. A generalized model of managing innovative project risks is proposed; this model includes the stages of developing possible measures to counter risks and making decisions on selecting the preferred option. The probable types of innovation project risks, methods of their assessment under uncertainty are considered. The techniques to counter innovation risks, including the types of project risk insurance, are analyzed.A decision tree is developed to select a technique for countering risk based on a number ofits characteristics that are defined according to the qualitative and classification scale. The suggested technique is formalized for selecting a mechanism to insure project risks, taking into account the probabilities of specific risks, their costs and the general insurance fund of a project. A process model is developed to select the preferred technique of insurance, taking into account the integral assessment of an innovation risk. Conclusions. The use of the developed models while planning the risk management of an innovative project increases the validity and reliability of decisions concerning the selection of a technique for countering risks, taking into account the characteristics of specific risks, the magnitude of the integral risk and the features of a particular project.