2019 Issue №2

This paper is devoted to contemporary the concept of developing a softwa­re module that calculates the radio wave propagation zone for the Global Mar­itime Distress and Safety simulator complex. Adjustments were made to the calculations that optimize the operation of the module. The algorithm is im­plemented on modern cross-platform approach. The main result of the de­veloped module is demonstrated.

The problem of transformation of some elementary closed and non-closed curves by means of successive iterations of conformal mapping is considered. Since the analytical description of the equations of images for some conformal mappings is quite complicated, it is convenient to use the Maple computer algebra system to implement the iterative process.

The method of finding prime numbers without computer calculation is shown. Subsets P1 = {6k1 – 1}, P2 = {6k2 + 1}, Q1 = {6j1 – 1}, Q2 = {6j2 + 1} are considered, where P1 È P2 are all prime numbers p ≥ 5; Qi are all odd composite numbers of such form. Subsets Ai = {ki}, Bi = {ji} (i = 1, 2) are investigated. It is proved that Bi by exploit sequences of natural numbers are lastly defined for ji £ a ⋲ N. Numbers ki are omitted natural numbers in Bi as Ai = N\Bi. For ki £ 200 all numbers of the sets Ai (and therefore all such prime numbers of the sets Pi) are defined.

The authors considered the possibility of using Li-Fi technology using one main emitting LED and several re-emitting LEDs to provide subscriber ac­cess. The use of this method allows achieving a throughput of up to 10 Gbit / s.

The possibility of application coherent time-frequency multiplexing is cosi­dered at construction of free space optical communication lines, which allows to increase the effective communication range and channel capacity for the sub­scriber access network.

The results of simulation modeling of the automated climate control sys­tem for growing plants in closed ground are discussed. Obtained results show the consistent interaction of its all main modules. The presented model is de­signed both for the designing of the new climate-control systems and for the managing of existing software-hardware complexes on the base of commercial­ly available technical devices and software.

The paper presents the results of a study in which laboratory facilities were assembled to measure the probability of receiving erroneous bits for BPSK, QPSK, 8PSK, DBPSK, QAM-4,8,16,64 radio signals for various SNRs in the MATLAB + Simulink simulation environment. The research results and the developed virtual laboratory setup have found application in a comparative assessment of the noise immunity of a ra­dio channel using standard and advanced patented information transmission systems within the marine mobile satellite service when receiving radio sig­nals with various types of shift keying.

The paper considers the development of a simulation model of the valve production process of the electro-pneumatic control unit in AnyLogic envi­ronment. The model is designed to find downtime in production operations. The work of three structures involved in the production of the considered part is simulated: a warehouse, a machine shop and an assembly shop. As a result of the simulation model, downtime was found, which reduced production time by 17 %.