Oleg V. Prokofiev

Abstract: There are schematic solutions in electrical measurements and communication technique when information is transmitted in the form of duration of a time interval specified by a rectangular pulse. The reasons for the appearance of additive noise effecting the pulse duration are numerous and cannot be completely eliminated. These are caused not only by electromagnetic interference in the environment, but also by limitations in the characteristics of the electronic components of any operating principle including fiber optic transmission lines. The restrictions imposed by the noise on the accuracy of a time interval allocation were considered in this article. The additive model of the data signal and centered noise acting together upon the pulse shaper input are considered in the article. It is assumed in the model that the shaper conversion function is characterized by hysteresis that protects against false actuating. Some relationships between the distribution law form of the shaper response time, data signal form and noise statistical characteristics are revealed. It is obtained that moments of a shaper actuating are complied with the truncated Gaussian law. The time interval error is evaluated for cases when the front and slice of the pulse are determined by the moments of action of one shaper or some shaper with different noise statistical characteristics.

Abstract: This paper is devoted to finding a relationship between harmonic interference on a data transfer and the pulse duration errors in transmitting an informative signal. Looking for a noise immunity in the case of pulse-width modulation makes sense if we can’t rely upon fiber-optic channels and other stationary equipment only. Surging interferences on a channel transmitting a pulse modulated signal result in a jitter on the leading and falling edges of the pulses. If the noise influence can’t be eliminated, a data transfer errors occur, inherent to the pulse-width modulation and other kinds of pulse modulation. At the time of making the paper, the authors were exploring a rationale for how the time lapse fixing errors are dependent on harmonic interference parameters. Here we give a grounding for the rule of the distribution law for the triggering moment of a rectangular pulse shaper. It is shown, that any straightforward measures are not enough to reduce these errors. The rule of probability density distribution of the time when the forming device gets triggered, is stated not only as a whole, many widespread cases are shown as well. The resulting analytics can be used both to find a trade-off between parameters of a device operating in a noisy condition, and as a measure of the pure theoretical limit pulse-width modulation as well.

Abstract: . This article discusses the problem of data synchronization methods using microservice architecture. Microservices is a popular and widespread software architecture today. The article investigates three main ways of interaction of microservices. They are event-based communication, interaction through direct HTTP requests and messaging, and also highlights and analyzes their advantages and disadvantages. The main purpose of the article is to analyze and make offer of the optimal option for solving the problem of synchronizing interacting microservices in real time. The optimal solution involves using the Apache Kafka message broker. It publishes data streams and subscriptions to them, as well as stores and processes them. Mathematical modeling of the proposed data synchronization method was described by constructing its state macine, as well as a system of canonical equations. expert systems; hardware and software implementation high-performance computing University. The main areas of activity are modeling of models of multi-threaded and multiprocessors computing systems using the mathematical apparatus of systems and Queuing networks; development of parallel algorithms for expert systems; hardware and software implementation of high-performance computing systems.