Dmytro Kucherov - Academia.edu (original) (raw)

Papers by Dmytro Kucherov

Advances in Science, Technology and Engineering Systems Journal, 2020

A R T I C L E I N F O A B S T R A C T Article history: Received: 09 July, 2020 Accepted: 19 July,... more A R T I C L E I N F O A B S T R A C T Article history: Received: 09 July, 2020 Accepted: 19 July, 2020 Online: 09 August, 2020 Together with the intensity of development in the field of technology of unmanned platforms and their effective use for solving various tasks of peacetime and war, the requirements for the training of the operator managing the platform also increase. This fully applies to personnel providing the flight of manned means. Nevertheless, there are significant differences in the requirement of operator preparedness for an unmanned platform. This is, first of all, control in conditions of remoteness from an unmanned platform, orientation on the display of the control panel, delays in the passage of information, and possibly a complete loss of communication. In such conditions, the requirements for the reaction time of the operator increase, he must also have the ability to anticipate the development of the situation, be able to work with available equipment for a l...

Model of UAV as agent of multiagent system

2018 IEEE 9th International Conference on Dependable Systems, Services and Technologies (DESSERT), 2018

A multi-agent system consisting of a UAV and performing the task of monitoring the ground situati... more A multi-agent system consisting of a UAV and performing the task of monitoring the ground situation is considered. Agents of this system in the interests of performing the main task, except for the flight along the main route, are able to change the trajectory of movement, which arises in the event of an obstacle in the path of movement. The main problem in this situation is the lack of an acceptable mathematical model for the synthesis of the control laws the multi-agent system. The article deals with the mathematical model for movement along a line and curve trajectory. A mathematical model is constructed for a 4-motor UAV in the representation of its motion in a six-dimensional space. The group is formed relative to the leader further management is only by the leader. Distances, intervals, and attain a height between elements of the group are maintained in accordance with the proportional law. The main result of this article is the study of the mathematical model of UAVs for coll...

Сучасні програмні засоби обробки зображень

Information presented in graphical form can better perceive the data for analysis and further pro... more Information presented in graphical form can better perceive the data for analysis and further processing. Large selection of software packages for graphics peculiarities associated with the presentation of graphical information and the need to solve specific tasks. The use of software for image processing in different sectors of human activity raises the task review the relevant analytical software. For the analysis of selected software products best known for working with raster, vector and fractal graphics. An analytical review of software products and graphics imaging rating of set the intensity of their use. The classification software and presented its component structure. Based on the developed classifications created software selection rule. Results of the work make it possible to identify the components of an existing software needs further improvement and development and is the basis for new software. Graphic editor selection formula is reduced to coincidence the relevant u...

Synthesis of the switching control law for a quadrotor autopilot

Вычисление интегралов методом Монте-Карло при решении задачи освещённости синтезированных объектов

Рассматривается задача вычисления многомерных интегралов методом Монте-Карло, которая наиболее ча... more Рассматривается задача вычисления многомерных интегралов методом Монте-Карло, которая наиболее часто применяется при расчёте глобальной освещенности синтезированных объектов, созданных различными программными средствами, известная как задача рендеринга. Предлагается метод и алгоритм расчёта таких интегралов.

Indonesian Journal of Electrical Engineering and Computer Science, 2021

The paper considers the problem of synthesizing a control law that stabilizes the spatial positio... more The paper considers the problem of synthesizing a control law that stabilizes the spatial position of an airborne object. The control object is a quadrotor with nonlinear dynamics. To solve the stabilization problem, a mathematical model of the quadrotor has been developed, taking into account its positionin the Cartesian and Euler coordinate systems. The new control law has been synthesized using the backstepping procedure. This control law is based on the Lyapunov-type stabilization criterion. New results analysis of the quadrotor dynamics, where has been showing the dependence of the control accuracy on the parameter of the stabilization criterion also presented. An algorithm for the directed search of the procedure parameter also has been proposed. It ensures the desired quality of the transient process. Simulation results confirming the results of the oretical research have been presented as well.

Features of Signal Processing by Means of LoRa Technology

The paper deals with the features of signal processing in receiving devices using LoRa technology... more The paper deals with the features of signal processing in receiving devices using LoRa technology. A feature of the technology is the ability to build a radio network for transmitting messages over long distances under the condition of long-term battery operation. The main attention is paid to the study of the influence multipath propagation on the operation of the receiving device. For this purpose, the basic characteristics of the received signal, its frequency properties, the possibilities of spreading the spectrum, encoding and recovering the transmitted information, receiving a packet of individual pulse signals and the quality of packet processing as a whole, as well as the effect of multipath propagation, are studied. The technique for studying a receiver in a confined space with an estimate of the calculated and experimental data is proposed. The studies were carried out according to the "point-to-point" schemes. The test results are given.

Іdentification Approach To Determining Of Radio Signal Frequency

The article deals with method of spectral analysis of radio, which can be useful in used for rece... more The article deals with method of spectral analysis of radio, which can be useful in used for receiving signals by undirected antenna. The main problem of this analysis is find the central of frequency of a sinusoidal oscillation when observed object hidden in noise. Typically this problem is solves by estimation unknown frequency by least square error method. In this paper, proposed iterative technique that can be used for in panoramic receiving set. The advantage of the new estimator is its computational simplicity. Keywords—radiosignal; digital processing; frequency; maximum of periodogram; identification

Керування перевантаженням комп'ютерної мережі

Розглядається комп’ютерна мережа, що функціонує в умовах перевантажень та збоїв. Подається аналіз... more Розглядається комп’ютерна мережа, що функціонує в умовах перевантажень та збоїв. Подається аналіз алгоритмів маршрутизації за умови резервування частки перепускної здатності. Встановлюються умови функціонування мережі в умовах перевантажень, які приводять до реконфігурації початкової топології, адекватність якої аналізується за схемою «загибель-розмноження». Встановлюються також умови відновлення перепускної здатності за рахунок компенсації перепускної здатності.

Detection of Signals from a LoRa System Under Interference Conditions

The paper examines the factors that affect the detection of signals in devices using modern LoRa ... more The paper examines the factors that affect the detection of signals in devices using modern LoRa technology to exchange information between devices that are part of the Internet of things in an interference environment. Features LoRa technology is a long range of information exchange in comparison with similar technologies, which is achieved through the spreading spectrum, the transmission of information in short packages and suppression of multipath signal propagation. The article notes the contribution of each factor to the quality of reception and studies the reception of the messages at the LoRa technology in a city with the significant interference that created by means of cellular communication and Wi-Fi devices.

Some Features of LoRa Technology Under Multi-Ray Reception

Now we can see the rapid growth of the internet of things market, and low power wide area technol... more Now we can see the rapid growth of the internet of things market, and low power wide area technologies have become very popular. Among these technologies, a long-range (LoRa) is one of the leading. The article discusses the features of the chirp signal that applied in LoRa technology under the conditions of multipath signal propagation, which takes place in densely populated areas, in a mine, high buildings, and other similar places. Multipath reception makes it difficult to process the true signal, so side signals are perceived as interfering. The paper analyzes the probability of symbol error and the bitrate under conditions equivalent to multipath propagation. The main feature of the presented work is a consideration of the case of signal propagation in the absence of direct beam propagation, i.e. Rayleigh's communication channel. When analyzing the parameters under study, the geometric representation of the received signals was essentially used. The obtained results are give...

Operator Training for Unmanned Aerial Vehicles Control

Concerning the development of unmanned aircraft technology, the work an operator of unmanned aeri... more Concerning the development of unmanned aircraft technology, the work an operator of unmanned aerial vehicles becomes in demand, and its main tasks are the remote control and ground preparation of unmanned aerial vehicles to solve intended tasks. Despite the intensive use of unmanned aerial vehicles for solving military tasks, the scope of application of these devices is gradually expanding in the interests of solving peacetime tasks. Apart from delivering monitoring of territories and objects, the delivery of goods, money, the creation of temporary radio networks for receiving and transmitting information and others are covering. To solve these problems, a qualified training of specialists serving this equipment is necessary. Based on the theoretical and practical training of unmanned aerial vehicle operators, criteria for evaluating the operator's activities are justified and put forward. The evaluation model of the quality training process of specialists in the maintenance and...

We consider an important technology of linear algebra, aimed at reducing the size of files intend... more We consider an important technology of linear algebra, aimed at reducing the size of files intended for storing images and transmitting them over the network. The technology involves the use of elements of tensor analysis based on singular decomposition. A feature of the technology used is the representation of the image by the matrix triad, which includes the tensor core and a pair of unitary matrices containing right and left singular vectors, respectively. Compression is achieved by one recurrent procedure, which involves lowering the rank of the triad to the level of allowable errors while maintaining the original image size. The compression algorithm is an iterative procedure with control of the Frobenius norm by the error matrix of the deviation of the original and the approximation matrix, which ensures the permissible value specified by the designer. The article establishes the basic features of the algorithm, in particular, convergence in a finite number of steps. This tech...

Processing Signals in the Receiving Channel for the LoRa System

The chapter devoted studying some characteristics of signal used in receiving devices by LoRa tec... more The chapter devoted studying some characteristics of signal used in receiving devices by LoRa technology. The main feature of this technology relates the ability to build wireless networks for transmitting short messages over long distances under the condition of the long-life battery. Our investigation focused on the impact of interference on the functioning of the receiving set. With this purpose, we studied the basic characteristics of the received radio signal, its frequency properties, the possibilities of spreading the spectrum, encoding and recovering the transmitted information, receiving a packet of individual pulse signals and the quality of packet processing as a whole, and the effect of multipath propagation. We also proposed an approach for studying a receiver in highly populated areas with an estimate of the calculating and experimental data. To check the quality of processing the received information the studies were carried out according to the “point-to-point” and “...

A computer system for images compression

A new approach to images compression is proposed. The approach involves the use of elements of te... more A new approach to images compression is proposed. The approach involves the use of elements of tensor analysis based on singular decomposition. A feature of this approach used is the representation of the image by the matrix triad, which includes the tensor core and a pair of unitary matrices containing right and left singular vectors, respectively. Compression is achieved by one recurrent procedure, which involves lowering the rank of the triad to the level of allowable errors while maintaining the original image size. The result of semi-natural modeling the system components is provided.

The paper deals with modern technology for transmitting short messages over long distances named ... more The paper deals with modern technology for transmitting short messages over long distances named LoRa, where the transmitted signal uses linear frequency modulation (chirp). The object of the study to define lack of transmitters that it has a design on LoRa technology for assessment their applicable in condition urban city where there are a lot of radiation sources. The goal of the work is the creation of a method of assessing the act the interference conditions that based on measurement bit error rate and signal-noise ratio and via on which to get individual host vulnerability levels. The processing of these signals is carried out by means of a time-frequency transformation. The chirp signal is characterized by 4 parameters: frequencies, time, modulation rate and amplitude. By analogy with the wavelet transform, the processing of chirp signals involves a chirplet decomposition. Since the chirp signals are strongly influenced by mutual interference due to multipath, the article stud...

Expert control systems emulate the decision making ability of a human expert for solving complex ... more Expert control systems emulate the decision making ability of a human expert for solving complex problems by reasoning about knowledge. Artificial intelligence techniques are usually used for the purpose of representing knowledge and for generating control decisions through an appropriate reasoning mechanism. In this paper, the generalized form of knowledge representation models in expert control systems is represented. Furthermore, an algorithm for deriving managerial decisions based on the method of resolving is described. Unified control models are proposed that allow one to determine combinations of control operations that can bring the control object to normal if it goes beyond the permissible ranges of several characteristics. It is proved that when assessing the characteristics of the state of the control object in qualitative categories, the task of deriving a managerial decision is reduced to solving a system of linear equations with Boolean variables or combinatorial optim...

Advances in Mechatronics and Mechanical Engineering, 2019

A solution is proposed for the task of controlling a group of UAVs moving along a given route. Th... more A solution is proposed for the task of controlling a group of UAVs moving along a given route. The group is considered as a limited-size formation consisting of n-agents moving relative to the leader, which allows us to treat the group as some aggregate with the center of motion. The quantitative composition of a group can change while maintaining the integrity of the group. The chapter proposes the use of smooth laws governing the motion of a group. The safety of motion is ensured by introducing into the law of control the components equivalent to the creation of attractive and repulsive fields.

Cases on Modern Computer Systems in Aviation, 2019

The chapter deals with the problem of controlling the flow of information coming from a group of ... more The chapter deals with the problem of controlling the flow of information coming from a group of unmanned air vehicles by radio channel. The inevitable data losses are compensated by repetition of lost packages or reconfiguration network. Modern methods control of data flow assumes using a mechanism ARQ based on the method sliding window. The consequence of these problems is a partial or total loss of its performance manifested in a decrease in the network's starting throughput. Part of the problem of restoring the network is solved by routing mechanisms, which lead to reconfiguration of the network due to the elimination of faulty nodes. Management of computer network overload is solved by well-known routing protocols such as OSPF, IS-IS, RIP, and others. In solving the problem, the representation of the output of individual nodes of the network using the "death and reproduce" scheme was used substantially. This scheme of network operation presupposes its representation by the Markov chain and the derivation of probabilistic characteristics by solving the Kolmogorov equations.

Advances in Mechatronics and Mechanical Engineering

In this chapter, the authors present an approach to the extrinsic environs diagnostics based on u... more In this chapter, the authors present an approach to the extrinsic environs diagnostics based on using visual information collected by autonomous robots. The possibility of utilizing a computer vision for the purpose of rational control implementation in the condition of the full or partial uncertainty is investigated. In the study, the combined hardware and software computer vision tools were verified. The models, algorithms, and codes for solving the local tasks of obstacle identification and mutual location kinematic parameters estimation have been developed. A series of computational and in-kind experiments that illustrate a practical possibility of implementing the navigational environment diagnosis is carried out with the aim to select a rational flight path.