Journal of Applied Informatics

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Cherny R.

Degree	Cand. Sci. (Eng.), Head of Receiving Complexes Department, Astro Space Centre of the P. N. Lebedev Physical Institute of the Russian Academy of Sciences
E-mail	roma.cherny@yandex.ru
Location	Moscow, Russia
Articles	Model of multipackage information exchange on a data network The principle of any TCP-like protocol is a multipackage message transfer with address repeating. An approach to estimating the time probability parameters and timing of bringing multipackage messages based on the Markov chains theory is presented. Read more... Analysis of treatment process segments-blocking switching scheme taking into account the diversity of communications channels Industrial high-performance routers are essential components for building secure networks for remote control and monitoring of industrial facilities. The main function of the router is to read the packet headers of network protocols received and buffered on each port, and decide on the further route for the packet to follow its network address, including the network number and node number. This article discusses the mathematical model of the processing of segments in the router (switching node). In a fully accessible switching circuit, any input can be connected to any output if the latter is in the idle state (not busy servicing any call). In incomplete schemes, this condition is not fulfilled, all inputs and outputs are divided into groups, and certain groups of inputs have access (connectivity) to certain groups of outputs. If the description of the switching node from the specified positions requires only knowledge of the number of inputs and outputs, then the description of the switching system of incompletely accessible circuits indicates the number of groups of inputs and the ability to access certain groups of inputs to certain groups of outputs. Read more... Algorithms for increasing the resource of ROM and RRD memory operation in deep space conditions In space-ground interferometry systems, in order to improve UV plane filling and the quality of synthesized images, antenna systems separated from each other are used, thus forming variable projections of the spacecraft – ground receiving station. The increasing amount of information from highly sensitive receiving devices leads to rapid filling of the onboard memory with scientific data. In order to quickly read data from the onboard memory device, it is reasonable to increase the speed of transmitted data on the spacecraft-NSPI line. A variant of correcting group errors in a communication channel using algorithms of interleaved lossless coding/decoding distributed according to linear and pseudo-random laws is considered, which allows increasing the survivability of memory elements when transmitting data from autonomous systems in near and deep space. Some memory elements can be switched off until a certain moment of time. Group errors arising in this case can be transformed into single errors in accordance with the interleaving algorithms for correction of the latter by redundant noise-resistant code. In case of failure of certain memory elements, using the above mentioned algorithms, it is possible to transform group errors into single errors with subsequent correction in the same way. The application of non-loss interleaving interleaving codes under the conditions of normalization of the frame of the basic packet allows to increase the reliability of functioning of electronic memory elements. Nowadays, the development of computer technology allows data accumulation/input via a high-speed bus. This significantly increases the recording speed and the volume of stored data. A variant of the recording system is proposed, which can be used for operation in satellite data reception centers and radio astronomical data processing centers. The versatility of this system provides the possibility to build in a video converter, decoder, increase SSD data array. Read more...