This article explores the probabilistic characteristics of closed queuing systems, with a particular focus on the differences between "patient" and "impatient" demands. These categories of requests play a crucial role in understanding the dynamics of service, as patient demands wait in line, while impatient ones may be rejected if their waiting time exceeds a certain threshold. The uniqueness of this work lies in the analysis of a system with a three-component structure of incoming flow, which allows for a more detailed examination of the behavior of requests and the influence of various factors on service efficiency. The article derives key analytical expressions for determining probabilistic characteristics such as average queue length, rejection probability, and other critical metrics. These expressions enable not only the assessment of the current state of the system but also the prediction of its behavior under various load scenarios. The results of this research may be useful for both theoretical exploration of queuing systems and practical application in fields such as telecommunications, transportation, and service industries. The findings will assist specialists in developing more effective strategies for managing request flows, thereby improving service quality and reducing costs.

Keywords: waiting, queue, service, markov process, queuing system with constraints, flow of requests, simulation modeling, mathematical model

The article discusses an optical vector analyzer with high resolution and high accuracy based on optical double-sideband modulation and stimulated Brillouin scattering. A model of an optical vector analyzer is presented.

Keywords: optical vector analyzer, double-sideband modulation, stimulated Brillouin scattering, fiber Bragg grating with phase shift, simulation, Optisystem

This work analyzes the methods of dismantling and demolition of reinforced concrete structures, namely: manual, mechanical and semi-mechanical method, drilling and blasting method, thermal method. The main advantages and disadvantages of these methods, the possibility and economic feasibility of their use in the interests of the Ministry of Defense of the Russian Federation are also considered. On the basis of the analysis carried out, taking into account the limitations of the use of the methods, a promising electro-hydraulic pulse method for dismantling reinforced concrete structures was proposed and the necessary conditions for its implementation in industrial mastabs in the interests of the Ministry of Defense were indicated.

Keywords: reinforced concrete, reinforced concrete structures, dismantling, demolition, work safety, efficiency, military infrastructure

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